JP2011107347A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus in which an observer easily recognizes the existence of an image even when the displayed image is small, and expressive power of the image is improved. <P>SOLUTION: The image forming apparatus 1 includes: a projector 2 so configured to switch between a first state in which the image is displayed by scanning light on a display surface 91a set on a wall surface W1 and a second state in which the image is displayed by scanning light on a display surface 91b set on the floor F1 which is perpendicular to the wall surface W1 at a position which is different from the display surface 91a; and a control means 8 (switching means) which switches the first state and the second state of the projector 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image forming apparatus.

A projector is known as a device that projects light onto the surface of an object such as a screen and displays a desired image on a projection surface of the screen. As such a projector, a projector using an optical scanner that scans light one-dimensionally or two-dimensionally has been put to practical use (for example, see Patent Document 1).
In the projector described in Patent Document 1, the first optical scanner in which the movable plate having the light reflecting portion rotates around the x axis, and the movable plate having the light reflecting portion rotates around the y axis orthogonal to the x axis. And a light source device that emits light such as a laser. In such a projector, the light emitted from the light source device is scanned by the first optical scanner, and the scanned light is further scanned by the second optical scanner, thereby scanning the light two-dimensionally. Display the desired image on the screen.

By the way, in recent years, for example, a screen is installed in a premises of a busy station, a building, a lobby of a hotel, etc., and a desired image (promotion video, CM video, etc.) is used on the screen using the projector as described above. It has been proposed to promote and advertise to people around the screen by displaying.
However, the projector described in Patent Document 1 has a problem that it is difficult for humans to recognize the presence of an image because the image display target is only one screen that is set in advance. In particular, if the screen is small, it is difficult for humans to recognize the presence of an image. If the presence of the image is not recognized, the content of the image cannot be recognized, and for example, the effect of advertising / advertisement (promotion effect) cannot be obtained.

In addition, even if the screen is enlarged, it is not always easy for humans to recognize the presence of an image, and it may be difficult to enlarge the screen due to restrictions on the installation space of the screen.
Further, for example, in order to improve the effect of advertisement / advertisement, it is desired to further enhance the expressive power of images.

JP 2008-116668 A

  An object of the present invention is to provide an image forming apparatus that makes it easy for a human to recognize the presence of an image even when the image to be displayed is small and enhances the expressive power of the image.

Such an object is achieved by the present invention described below.
In the image forming apparatus of the present invention, the first state in which an image is displayed by scanning light on the first display unit set on the first surface and the first display unit at a position different from the first state. A projector configured to be switchable between a second state in which an image is displayed by scanning light on a second display unit set on a second surface orthogonal to the first surface;
The projector includes switching means for switching between the first state and the second state of the projector.

As a result, by changing the position where the image is displayed, even if the areas of the first display unit and the second display unit are relatively small, the presence of the image with respect to a person existing around the image forming apparatus Can be easily recognized.
Also, by changing the position where the image is displayed, the expressive power of the image can be enhanced.

In particular, according to the image forming apparatus of the present invention, since images are displayed on two mutually orthogonal surfaces, it is possible to make a person who exists in a wider range of directions recognize the presence of the image.
For these reasons, the image forming apparatus according to the present invention makes it easy for a human to recognize the presence of an image even when the image to be displayed is small, and can enhance the expressiveness of the image.
In addition, since the image forming apparatus according to the present invention displays an image using a projector, the apparatus is less expensive than those using a flat panel display such as an LED panel, a liquid crystal panel, and an organic EL panel. Easy to install.

In the image forming apparatus of the present invention, the projector includes a light emitting unit that emits laser light,
An optical scanning unit that scans laser light emitted from the light emitting unit in a first direction and a second direction orthogonal to each other,
The first state and the second state can be switched by changing the center position of the scanning range of the laser beam in the first direction and / or the second direction of the optical scanning unit. It is preferable that

  Thereby, it is possible to realize a projector capable of switching between the first state and the second state relatively easily. Further, since the laser beam is used, the focus is free, the proximity projection is possible, and the projection position is not limited to the installation position and can be adjusted to an arbitrary position. In addition, when laser light is used, an optical system such as a lens for making parallel light can be omitted or simplified, so that the light emitting unit can be downsized, and the image forming apparatus can be downsized. .

In the image forming apparatus of the present invention, the optical scanning unit is provided such that a movable plate provided with a light reflecting unit that reflects the laser light emitted from the light emitting unit is rotatable about one axis or two axes orthogonal to each other, An optical scanner that scans the display surface with the light reflected by the light reflecting portion by the rotation;
It is preferable that the first state and the second state can be switched by changing the center position of the amplitude in the rotation of the movable plate.
Thereby, it is possible to realize a projector capable of switching between the first state and the second state relatively easily and inexpensively.

The image forming apparatus of the present invention has a human sensor that detects whether or not a human is present in a detection region set in the vicinity of the first display unit,
Preferably, the switching means switches between the first state and the second state based on a detection result of the human sensor.
Thereby, the display position of an image can be switched according to a human operation. As a result, it is possible to make it easier for a human to recognize the presence of an image.

The image forming apparatus of the present invention has a human sensor that detects whether or not a human is present in a detection region set in the vicinity of the second display unit,
Preferably, the switching means switches between the first state and the second state based on a detection result of the human sensor.
Thereby, the display position of an image can be switched according to a human operation. As a result, it is possible to make it easier for a human to recognize the presence of an image.

In the image forming apparatus according to the aspect of the invention, each of the first detection area set in the vicinity of the first display section and the second detection area set in the vicinity of the second display section. For a region, it has a human sensor that detects whether there is a person in the region,
Preferably, the switching means switches between the first state and the second state based on a detection result of the human sensor.
Thereby, the display position of an image can be switched according to a human operation. As a result, it is possible to make it easier for a human to recognize the presence of an image.

In the image forming apparatus of the present invention, the switching unit is in the first state when the human sensor detects the presence of a human in the first detection area, and the human sensor is in the first state. When the presence of a person is not detected in one detection area, the second state is preferable.
Thereby, it is possible to make it easier for a person existing in the first detection region to recognize the presence of the image on the first display unit.

In the image forming apparatus according to the aspect of the invention, the switching unit is in the second state when the human sensor detects the presence of a person in the second detection area, and the human sensor is in the first state. When the presence of a person is not detected in the second detection area, the first state is preferable.
Thereby, it is possible to make it easier for a person existing in the second detection region to recognize the presence of the image on the second display unit.

In the image forming apparatus of the present invention, the first display unit and the second display unit are set in at least one detection region of the first detection region and the second detection region. It is preferable.
Thereby, it is possible to make it easier for a person existing in the first detection region and the second detection region to recognize the presence of the images on the first display unit and the second display unit.

In the image forming apparatus according to the aspect of the invention, it is preferable that the projector includes a distortion correction unit that corrects distortion of an image displayed on each of the first display unit and the second display unit.
As a result, it is possible to display images with corrected distortion on the first display unit and the second display unit, respectively. Therefore, for example, the area and shape can be made equal between the first display unit and the second display unit.
In the image forming apparatus of the present invention, it is preferable that the first display unit and the second display unit are set so as not to overlap each other.
Thereby, since the 1st display part and the 2nd display part are individually recognized as a field, it can be made easy to recognize existence of an image.

In the image forming apparatus according to the aspect of the invention, it is preferable that the projector is installed on the first surface or the second surface.
Thereby, the optical path length of the light emitted from the projector can be shortened. Therefore, it is possible to prevent or suppress the light emitted from the projector from being blocked by, for example, a pedestrian. As a result, a desired image can be displayed on the first display unit and the second display unit without being affected by the surrounding environment (population density or the like).

In the image forming apparatus of the present invention, when the first display unit is viewed in plan, the second display unit is positioned on a line segment passing through the projector and the first display unit. Is preferred.
Thereby, the distortion of the first display unit and the second display unit can be corrected relatively easily.

In the image forming apparatus according to the aspect of the invention, it is preferable that a separation distance between the first display unit and the projector and a separation distance between the second display unit and the projector are equal to each other.
Thereby, the distortion of the first display unit and the second display unit can be corrected relatively easily.
In the image forming apparatus according to the aspect of the invention, it is preferable that the projector is installed in the vicinity of an intersection line between the first surface and the second surface.
Accordingly, the separation distance between the first display unit and the projector and the separation distance between the second display unit and the projector can be made equal to each other relatively easily.

In the image forming apparatus according to the aspect of the invention, it is preferable that each of the first surface and the second surface is set along a wall, a floor, a ceiling, or a surface of a screen installed thereon.
Accordingly, it is possible to make it easier for a person existing around the image forming apparatus to recognize the presence of the image inside or outside the building. Therefore, for example, when an advertisement image such as a commercial or a promotion video is used as a display image, an excellent advertisement function can be exhibited.

1 is a diagram illustrating a first embodiment of an image forming apparatus of the present invention. FIG. 2 is a block diagram illustrating a schematic configuration of the image forming apparatus illustrated in FIG. 1. FIG. 3 is a diagram illustrating a schematic configuration of a projector provided in the image forming apparatus illustrated in FIG. 2. FIG. 4 is a partial cross-sectional perspective view of an optical scanner provided in the projector shown in FIG. 3. FIG. 5 is a cross-sectional view for explaining the operation of the optical scanner shown in FIG. 4. FIG. 4 is a block diagram illustrating a control system (operation control unit, light scanning unit, and light source unit) of the projector illustrated in FIG. 3. FIG. 4 is a diagram (a is a side view, and b is a front view) for explaining the operation of the projector shown in FIG. 3. FIG. 4 is a graph showing changes in the deflection angle of the movable plate of the optical scanner (horizontal scanning optical scanner) during the operation of the projector shown in FIG. FIG. 4 is a graph showing changes in the deflection angle of the movable plate of the optical scanner (vertical scanning optical scanner) during the operation of the projector shown in FIG. FIG. 6 is a diagram (a is a side view, and b is a front view) showing a modification of the operation of the projector shown in FIG. 3. FIG. 2 is a top view showing a detection area of a human sensor in the image forming apparatus shown in FIG. 1. It is a figure which shows 2nd Embodiment of the image forming apparatus of this invention. It is a figure which shows 3rd Embodiment of the image forming apparatus of this invention. It is a figure which shows 4th Embodiment of the image forming apparatus of this invention. FIG. 15 is a top view showing a detection area of a human sensor in the image forming apparatus shown in FIG. 14. It is a figure which shows 5th Embodiment of the image forming apparatus of this invention. It is a typical plane which shows the optical scanner of the projector with which the image forming apparatus which concerns on 6th Embodiment of this invention was equipped. FIG. 20 is a sectional view taken along line B-B in FIG. 19. It is a block diagram which shows the voltage application means of the drive means with which the optical scanner shown in FIG. 19 was equipped. It is a figure which shows an example of the voltage which generate | occur | produces in the 1st voltage generation part with which the voltage application means shown in FIG. 21 was equipped, and the 2nd voltage generation part. FIG. 10 is a diagram (a is a side view, and b is a front view) for explaining the operation of a projector provided in an image forming apparatus according to a sixth embodiment of the present invention. It is a block diagram which shows schematic structure of 7th Embodiment of the image forming apparatus of this invention. FIG. 23 is a partial cross-sectional side view showing a projector and driving means provided in the image forming apparatus shown in FIG. 22. FIG. 24 is a top view for explaining rotation of the projector by driving of the driving unit shown in FIG. 23. It is a perspective view which shows the optical scanner of the projector with which the image forming apparatus of 8th Embodiment concerning this invention was equipped. It is a figure which shows schematic structure of the projector with which the image forming apparatus of 9th Embodiment concerning this invention was equipped.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an image forming apparatus of the invention will be described with reference to the accompanying drawings.
<First Embodiment>
1 is a diagram illustrating a first embodiment of an image forming apparatus according to the present invention, FIG. 2 is a block diagram illustrating a schematic configuration of the image forming apparatus illustrated in FIG. 1, and FIG. 3 is a diagram illustrating the image forming apparatus illustrated in FIG. FIG. 4 is a diagram showing a schematic configuration of the projector provided, FIG. 4 is a partial sectional perspective view of the optical scanner provided in the projector shown in FIG. 3, and FIG. 5 is a sectional view for explaining the operation of the optical scanner shown in FIG. 6 is a block diagram showing a control system (operation control unit, light scanning unit, and light source unit) of the projector shown in FIG. 3, and FIG. 7 is a diagram for explaining the operation of the projector shown in FIG. 8 is a side view, b is a front view, and FIG. 8 is a graph showing changes in the deflection angle of the movable plate of the optical scanner (horizontal scanning optical scanner) during the operation of the projector shown in FIG. FIG. 9 shows the graph shown in FIG. FIG. 10 is a graph showing changes in the deflection angle (change in angle with time) of the movable plate of the optical scanner (optical scanner for vertical scanning) during operation of the projector, and FIG. 10 shows a modification of the operation of the projector shown in FIG. FIG. 11A is a side view, FIG. 11B is a front view, and FIG. 11 is a top view showing a detection region of a human sensor in the image forming apparatus shown in FIG. In the following, for convenience of explanation, the upper side in FIGS. 4, 5, 7, and 10 is referred to as “upper”, the lower side as “lower”, the right side as “right”, and the left side as “left”.

The image forming apparatus 1 shown in FIG. 1 is alternately arranged on display screens 91a and 91b (display surface 91) of two screens (display objects) 9a and 9b (screen 9) installed in a building such as a building. (Sequentially) is a device that displays a predetermined image such as a still image or a moving image (especially commercial or promotional video).
In the present embodiment, the screen 9a is installed on the wall surface W1 of the wall W, the screen 9b is installed on the floor surface F1 of the floor F orthogonal to the wall surface W1, and the display surface 91a and the display surface 91b are at different positions. Is set.

  In the present embodiment, the display surface 91a is a first display unit, and the display surface 91b is a second display surface set at a position different from the display surface 91a. Further, the plane set along the wall surface W1 is the first surface on which the display surface 91a is set, and the plane set along the floor surface F1 is the second surface. Moreover, although the floor surface F1 and the wall surface W1 are each a plane, you may have a curved part and an unevenness | corrugation.

  Thus, by alternately displaying images on the display surface 91a that is the first display unit and the display surface 91b that is the second display unit (that is, by changing the position where the image is displayed), the display is performed. Even if the areas of the surface 91a and the display surface 91b are relatively small, it is possible to make the presence of an image easily recognized by a person existing around the image forming apparatus 1. Also, by changing the position where the image is displayed, the expressive power of the image can be enhanced.

In particular, according to the image forming apparatus 1, since images are displayed on two mutually orthogonal surfaces (display surfaces 91a and 91b), it is possible to make a person existing in a wider range recognize the presence of the image. it can.
Therefore, the image forming apparatus 1 can exhibit an excellent advertisement function when, for example, an advertisement image such as a commercial or a promotion video is used as the display image.

  In the present embodiment, since the image is displayed on the display surfaces 91a and 91b set on the surfaces of the screens 9a and 9b, the image display surface is displayed as compared with the case where the image is directly displayed on the wall surface W1 or the floor surface F1. Optical characteristics suitable for image display can be obtained. Therefore, the visibility of the image can be improved regardless of the material of the place (the floor or the wall in this embodiment) where the image is displayed. The constituent material of the screen 9 is not particularly limited, and for example, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, acrylic resin, ABS resin, fluorine resin, epoxy resin, silicone resin, or these are mainly used. Copolymers, blends, polymer alloys and the like can be mentioned, and one or more of these can be used in combination.

As shown in FIG. 2, the image forming apparatus 1 includes a projector 2 that displays (draws) images by alternately scanning light on the two display surfaces 91 a and 91 b, and the presence or absence of a human near the screen 9. And a control means (switching means) 8 for controlling the driving of the projector 2 based on the detection result of the human sensor 7. Further, the image forming apparatus 1 includes a housing 11, and the projector 2, the human sensor 7, and the control unit 8 are accommodated in the housing 11.
Since such an image forming apparatus 1 displays an image using an optical scanning projector 2, the apparatus is less expensive than those using a flat panel display such as an LED panel, a liquid crystal panel, or an organic EL panel. Yes, and easy to install.

Hereinafter, each part constituting the image forming apparatus 1 will be sequentially described in detail.
(projector)
As shown in FIG. 3, the projector 2 includes a light source unit (light emitting unit) 3 that emits light, an optical scanning unit 4 that scans light emitted from the light source unit 3 with respect to the display surfaces 91a and 91b, and a display. Distortion correction means (operation control device) 5 for correcting distortion (trapezoid correction) of images displayed on the surfaces 91a and 91b.

In particular, the projector 2 includes a first state in which an image is displayed by scanning light on the display surface 91a which is a first display unit (hereinafter also simply referred to as “first state”), and a second display. The display surface 91b, which is a unit, is configured to be switchable between a second state in which an image is displayed by scanning light (hereinafter also simply referred to as “second state”).
In FIG. 1, an image displayed in the first state is indicated by a solid line, and an image displayed in the second state is indicated by a two-dot chain line.

[Light source unit (light emitting part)]
As shown in FIG. 3, the light source unit 3 includes laser light sources 31r, 31g, and 31b for the respective colors, collimator lenses 32r, 32g, and 32b and dichroic mirrors provided corresponding to the laser light sources 31r, 31g, and 31b for the respective colors. 33r, 33g, and 33b.

The laser light sources 31r, 31g, and 31b for the respective colors have drive circuits 310r, 310g, and 310b, a red light source 320r, a green light source 320g, and a blue light source 320b, respectively (see FIG. 6). As shown in FIG. 3, red, green and blue laser beams RR, GG and BB are emitted. The laser beams RR, GG, and BB are emitted in a modulated state corresponding to drive signals transmitted from a light source modulation unit 54 (to be described later) of the distortion correction unit 5, and collimator lenses 32r that are collimating optical elements, respectively. The beams are collimated by 32g and 32b to form a thin beam.
The dichroic mirrors 33r, 33g, and 33b have characteristics of reflecting the red laser beam RR, the green laser beam GG, and the blue laser beam BB, respectively, and combine the laser beams RR, GG, and BB of the respective colors into one laser beam. (Light) LL is emitted.

  A collimator mirror can be used in place of the collimator lenses 32r, 32g, and 32b. In this case as well, a narrow beam of parallel light beams can be formed. Further, when parallel light beams are emitted from the laser light sources 31r, 31g, and 31b of the respective colors, the collimator lenses 32r, 32g, and 32b can be omitted. Further, the laser light sources 31r, 31g, and 31b can be replaced with light sources such as light emitting diodes that generate similar light beams. Further, the order of the laser light sources 31r, 31g, and 31b, the collimator lenses 32r, 32g, and 32b, and the dichroic mirrors 33r, 33g, and 33b in FIG. 3 is merely an example, and combinations of the colors (red indicates the laser light source 31r). , Collimator lens 32r, dichroic mirror 33r, green is laser light source 31g, collimator lens 32g, dichroic mirror 33g, blue is laser light source 31b, collimator lens 32b, dichroic mirror 33b) and the order is freely set it can. For example, a combination of blue, red, and green is also possible in the order closer to the optical scanning unit 4.

[Optical scanning unit]
Next, the optical scanning unit 4 will be described.
The optical scanning unit 4 scans the display surfaces 91a and 91b with the laser light LL emitted from the light source unit 3 in the horizontal direction (first direction) (horizontal scanning: main scanning), and at a scanning speed in the horizontal direction. Also, scanning is performed two-dimensionally by scanning in the vertical direction (second direction orthogonal to the first direction) at a slow scanning speed (vertical scanning: sub-scanning).
In particular, the optical scanning unit 4 can switch between the first state and the second state described above by changing the center position of the light scanning range in the vertical direction (second direction). . Thereby, it is possible to realize the projector 2 that can switch between the first state and the second state relatively easily.

  The optical scanning unit 4 includes an optical scanner (first direction scanning unit) 41 that is a horizontal scanning mirror that scans the display surfaces 91a and 91b in a horizontal direction with the laser light LL emitted from the light source unit 3, and a light beam. An angle detection unit (behavior detection unit) 43 that detects an angle (behavior) of a movable plate 411a (to be described later) of the scanner 41 and a laser beam LL emitted from the light source unit 3 are scanned in the vertical direction with respect to the display surfaces 91a and 91b. An optical scanner (second direction scanning unit) 42 that is a vertical scanning mirror, and an angle detection unit (behavior detection unit) 44 that detects an angle (behavior) of a movable plate 421a (to be described later) of the optical scanner 42 are provided. Yes.

Hereinafter, the configuration of the optical scanners 41 and 42 will be described. Since the optical scanners 41 and 42 have the same configuration, the optical scanner 41 will be described below as a representative, and the optical scanner 42 will be described. Omitted.
As shown in FIG. 4, the optical scanner 41 is a so-called one-degree-of-freedom vibration system (one-dimensional scanning), and includes a base 411, a counter substrate 413 provided to face the lower surface of the base 411, and a base 411. And a spacer member 412 provided between the counter substrate 413 and the counter substrate 413.

The base 411 includes a movable plate 411a, a support portion 411b that rotatably supports the movable plate 411a, and a pair of connecting portions 411c and 411d that connect the movable plate 411a and the support portion 411b.
The movable plate 411a has a substantially rectangular shape in plan view. On the upper surface of the movable plate 411a, a light reflecting portion (mirror) 411e having light reflectivity is provided. The surface (upper surface) of the light reflecting portion 411e constitutes a reflecting surface that reflects light. The light reflecting portion 411e is made of a metal film such as Al or Ni, for example. A permanent magnet 414 is provided on the lower surface of the movable plate 411a.
The support portion 411b is provided so as to surround the outer periphery of the movable plate 411a in a plan view of the movable plate 411a. That is, the support part 411b has a frame shape, and the movable plate 411a is located inside thereof.

The connecting portion 411c connects the movable plate 411a and the support portion 411b on the left side of the movable plate 411a, and the connecting portion 411d connects the movable plate 411a and the support portion 411b on the right side of the movable plate 411a. Yes.
Each of the connecting portions 411c and 411d has a longitudinal shape. Further, each of the connecting portions 411c and 411d can be elastically deformed. The pair of connecting portions 411c and 411d are provided coaxially with each other, and the movable plate 411a is located with respect to the support portion 411b around this axis (hereinafter referred to as “rotation center axis J1”). Rotate.

  Such a base 411 is made of, for example, silicon as a main material, and a movable plate 411a, a support portion 411b, and connection portions 411c and 411d are integrally formed. As described above, by using silicon as a main material, it is possible to realize excellent rotation characteristics and to exhibit excellent durability. In addition, since silicon can be finely processed, the base 411 is made of silicon as a main material so that the base 411 has excellent dimensional accuracy and the optical scanner 41 has excellent vibration characteristics. Can do. Further, the optical scanner 41 can be reduced in size.

The spacer member 412 has a frame shape, and its upper surface is joined to the lower surface of the base 411. The spacer member 412 is substantially equal to the shape of the support portion 411b in the plan view of the movable plate 411a. Such a spacer member 412 is made of, for example, various glasses, various ceramics, silicon, SiO ₂ or the like.
The method for joining the spacer member 412 and the base 411 is not particularly limited. For example, the spacer member 412 may be joined via another member such as an adhesive, or may be directly joined depending on the constituent material of the spacer member 412. Anodic bonding or the like may be used.
Similar to the spacer member 412, the counter substrate 413 is made of, for example, various kinds of glass, silicon, SiO ₂ or the like. A coil 415 is provided on the upper surface of the counter substrate 413 and on a portion facing the movable plate 411a.

The permanent magnet 414 has a plate bar shape and is provided along the lower surface of the movable plate 411a. Such a permanent magnet 414 is magnetized (magnetized) in a direction orthogonal to the rotation center axis J1 in a plan view of the movable plate 411a. That is, the permanent magnet 414 is provided such that a line segment connecting both poles (S pole and N pole) is orthogonal to the rotation center axis J1.
The permanent magnet 414 is not particularly limited, and for example, a neodymium magnet, a ferrite magnet, a samarium cobalt magnet, an alnico magnet, or the like can be used.

The coil 415 is provided so as to surround the outer periphery of the permanent magnet 414 in the plan view of the movable plate 411a.
Further, the optical scanner 41 includes a voltage applying unit 416 that applies a voltage to the coil 415. The voltage application unit 416 is configured to be able to adjust (change) each condition such as the voltage value and frequency of the voltage to be applied. The voltage applying unit 416, the coil 415, and the permanent magnet 414 constitute a driving unit 417 that rotates the movable plate 411a.

A predetermined voltage is applied to the coil 415 from the voltage applying means 416, and a predetermined current flows.
For example, when an alternating voltage is applied from the voltage applying means 416 to the coil 415, a current flows accordingly, a magnetic field in the thickness direction of the movable plate 411a (vertical direction in FIG. 4) is generated, and the direction of the magnetic field is Switch periodically. That is, the state A in which the vicinity of the upper side of the coil 415 is the S pole and the vicinity of the lower side is the N pole, and the state B in which the vicinity of the upper side of the coil 415 is the N pole and the vicinity of the lower side is alternately switched. At that time, the voltage application unit 416 is driven and controlled by a distortion correction unit 5 described later.

In the state A, as shown in FIG. 5A, the right portion of the permanent magnet 414 is displaced upward due to the repulsive force with the magnetic field generated by energizing the coil 415, and the left portion of the permanent magnet 414. However, it is displaced downward by the attractive force with the magnetic field. Thereby, the movable plate 411a is rotated counterclockwise and tilted.
On the other hand, in the state B, as shown in FIG. 5B, the right portion of the permanent magnet 414 is displaced downward, and the left portion of the permanent magnet 414 is displaced upward. Thereby, the movable plate 411a rotates clockwise and tilts.
By alternately repeating the state A and the state B, the movable plate 411a rotates (vibrates) around the rotation center axis J1 while twisting and deforming the connecting portions 411c and 411d.

  In the vertical scanning optical scanner 42, the voltage application unit 416 can selectively apply two types of voltages having different center positions of the shake (amplitude) of the movable plate 421a to a coil (not shown). It is configured. Thereby, the center position of the amplitude in the rotation of the movable plate 421a can be changed. As a result, the center position of the light scanning range in the vertical direction (second direction) of the light scanning unit 4 can be changed. And the projector 2 which can switch a 1st state and a 2nd state comparatively easily and cheaply is realizable.

  More specifically, for example, in the first state in which an image is displayed on the display surface 91a, the center position of the amplitude of the rotation of the movable plate 421a is one side (clockwise) from the initial state of the movable plate 421a. ) Apply a first voltage to the coil of the optical scanner 42 so as to be in the rotated position. On the other hand, in the second state in which an image is displayed on the display surface 91b, the center position of the amplitude in the rotation of the movable plate 421a is a position rotated to the other side (counterclockwise) from the initial state of the movable plate 421a. Such a second voltage is applied to the coil of the optical scanner 42.

The first voltage and the second voltage are not particularly limited as long as the center position of the amplitude in rotation of the movable plate 421a can be changed. For example, the first voltage may be a zero-cross alternating voltage. In addition, a positive bias is superimposed on the alternating voltage and a negative bias is superimposed on the alternating voltage.
Further, the current flowing can be adjusted by adjusting the voltage applied from the voltage applying unit 416 to the coil 415 under the control of the distortion correcting unit 5 to be described later, whereby the movable plate 411a (of the light reflecting portion 411e) can be adjusted. The swing angle (amplitude) of the rotation of the reflection surface around the rotation center axis J1 can be adjusted.

  The configuration of the optical scanner 41 is not particularly limited as long as the movable plate 411a can be rotated. For example, the optical scanner 41 may have a two-degree-of-freedom vibration system. This driving method may be, for example, piezoelectric driving using a piezoelectric element, electrostatic driving using electrostatic attraction, or the like, instead of electromagnetic driving using the coil 415 and the permanent magnet 414.

  As shown in FIG. 3, the optical scanners 41 and 42 having the above-described configuration are provided so that the directions of the rotation center axes J1 and J2 are orthogonal to each other. By providing the optical scanners 41 and 42 in this manner, the laser light LL emitted from the light source unit 3 can be scanned two-dimensionally (in two directions orthogonal to each other) on the display surfaces 91a and 91b. Thereby, a two-dimensional image can be drawn on the display surfaces 91a and 91b with a relatively simple configuration.

  More specifically, the light emitted from the light source unit 3 is reflected by the reflecting surface of the light reflecting portion 411e of the light scanner 41, and then reflected by the reflecting surface of the light reflecting portion 421e of the light scanner 42, and the screen 9 Are projected (irradiated) on the display surfaces 91a and 91b. At this time, the light reflecting portion 411e of the light scanner 41 is rotated, and the light reflecting portion 421e of the light scanner 42 is rotated at an angular velocity slower than the angular velocity (speed). Thereby, the laser light LL emitted from the light source unit 3 is scanned in the horizontal direction with respect to the display surfaces 91a and 91b, and is scanned in the vertical direction at a scanning speed slower than the horizontal scanning speed. Thus, the laser light LL emitted from the light source unit 3 is scanned two-dimensionally with respect to the display surfaces 91a and 91b, and an image is drawn on the display surfaces 91a and 91b.

Here, in order to rotate the light reflecting portion 421e of the optical scanner 42 at an angular velocity slower than the angular velocity of the light reflecting portion 411e of the optical scanner 41, for example, the optical scanner 41 is set to resonance driving using resonance, and the optical scanner 42 is used. May be non-resonant driving without using resonance. When both the optical scanners 41 and 42 are driven to resonate, the resonant frequency of the optical scanner 41 (the resonant frequency of the vibration system including the movable plate 411a and the connecting portions 411c and 411d) is greater than the resonant frequency of the optical scanner 42. The optical scanners 41 and 42 may be designed to be higher.
The light emitted from the light source unit 3 may be reflected first by the light reflecting portion 421e of the light scanner 42 and then reflected by the light reflecting portion 411e of the light scanner 41. That is, it may be configured such that the vertical scanning is performed first and then the horizontal scanning is performed.

Next, the angle detection unit 43 that detects the angle of the movable plate 411a of the optical scanner 41 will be described. Note that the angle detection unit 44 that detects the angle of the movable plate 421a of the optical scanner 42 has the same configuration as the angle detection unit 43, and thus description thereof is omitted.
As shown in FIG. 4, the angle detection means 43 includes a piezoelectric element 431 provided on the connecting portion 411 c of the optical scanner 41, an electromotive force detection unit 432 that detects an electromotive force generated from the piezoelectric element 431, and an electromotive force. And an angle detection unit 433 that obtains an angle of the movable plate 411a based on the detection result of the detection unit 432 (detects the behavior).

  When the connecting portion 411c is torsionally deformed with the rotation of the movable plate 411a, the piezoelectric element 431 is deformed accordingly. When the piezoelectric element 431 is deformed from a natural state to which no external force is applied, the piezoelectric element 431 has a property of generating an electromotive force having a magnitude corresponding to the amount of deformation. Therefore, the angle detection unit 433 includes the electromotive force detection unit 432. Based on the magnitude of the electromotive force detected in step 1, the degree of twist of the connecting portion 411c is obtained, and the angle of the movable plate 411a (the reflection surface of the light reflecting portion 411e) is obtained from the degree of twist. In addition, the angle detection unit 433 obtains a deflection angle around the rotation center axis J1 of the movable plate 411a. A signal including information on the angle and deflection angle of the movable plate 411 a is transmitted from the angle detection unit 433 to the distortion correction unit 5.

The angle reference (0 °) of the movable plate 411a to be detected may be any state of the optical scanner 41. For example, the optical scanner 41 is in an initial state (a voltage is applied to the coil 415). It can be set when there is no).
Further, the detection of the angle of the movable plate 411a may be performed in real time (continuously) or may be performed intermittently. Further, the angle detection unit 43 is not limited to the one using the piezoelectric element as in the present embodiment as long as the angle of the movable plate 411a can be detected. For example, an optical sensor may be used.

[Distortion correction means]
Next, the distortion correction unit 5 will be described.
In the projector 2, when an image is displayed (drawn) on the display surfaces 91a and 91b using the pair of optical scanners 41 and 42 as described above, distortion caused by an optical path difference to the display surfaces 91a and 91b, for example, Distortion called “trapezoidal distortion” occurs in which the length in the horizontal direction (horizontal direction) is different between the upper side and the lower side of the images displayed on the display surfaces 91a and 91b. The distortion correction means 5 has a function of correcting such image distortion.
As a result, it is possible to display images with corrected distortion on the display surface 91a and the display surface 91b. Therefore, for example, the display surface 91a and the display surface 91b can have the same area and shape.

Hereinafter, the distortion correction means 5 will be described in detail. In the following, distortion correction on the display surface 91a will be representatively described, but distortion correction on the display surface 91b is also the same.
As shown in FIG. 6, the distortion correction unit 5 includes a video data storage unit (video data storage unit) 51 that stores video data (image data) used when drawing an image, a video data calculation unit 52, A drawing timing generation unit 53, a light source modulation unit (light modulation unit) 54, a deflection angle calculation unit (amplitude calculation unit) 55, an angle instruction unit 56, and a calibration curve storage unit (a calibration curve storage unit) that stores a calibration curve 57).

The projector 2 performs vertical scanning (hereinafter also simply referred to as “vertical scanning”) in each of the forward path and the backward path, and in each of the vertical scanning forward path and backward path, the horizontal direction scanning (hereinafter simply referred to as “horizontal scanning”). Are also displayed (drawn) on the display surfaces 91a and 91b.
Further, when performing horizontal scanning, the projector 2 emits the laser light LL on the display surfaces 91a and 91b in a light emitting state in which the laser light LL is emitted from the light source unit 3 (hereinafter also simply referred to as “light emitting state”). A horizontal deflection width (hereinafter, also simply referred to as “laser beam (light) LL deflection width”) is a deflection angle around the rotation center axis J1 of the movable plate 411a (hereinafter simply referred to as “the deflection of the movable plate 411a”). Compared to the case where adjustment (also referred to as “angle”) is not performed (adjustment by the adjusting means), the deflection angle of the movable plate 411a is adjusted so as to be aligned along the vertical direction. In particular, it is preferable to adjust the deflection angle of the movable plate 411a so that the deflection width of the laser beam LL is constant along the vertical direction in the light emission state. As a result, it is possible to prevent the trapezoidal distortion of the image while increasing the time aperture ratio. In the present embodiment, a description will be given of a case where the deflection width is typically adjusted to be constant along the vertical direction.

  The shake width (scanning range) is the laser light LL on the same plane as the display surfaces 91a and 91b when the movable plate 411a is rotated clockwise (predetermined direction) to the maximum angle in the light emission state. And the position of the laser beam LL on the same plane as the display surfaces 91a and 91b when the movable plate 411a is subsequently rotated counterclockwise (in the opposite direction) to the maximum angle. As shown in FIG. 7, the laser beam LL on the display surfaces 91a and 91b when the laser beam LL is two-dimensionally scanned on the display surfaces 91a and 91b in the light emission state as shown in FIG. Is the horizontal length of each of a plurality of drawing lines (scanning lines) L that are the locus of.

  As shown in FIG. 7, the plurality of drawing lines L are arranged in a zigzag manner. Of each drawing line L, the left end portion and the right end portion each have a small angular velocity (speed) of the light reflecting portion 411e of the optical scanner 41, and are not suitable for drawing. For this reason, a drawing area (display area) 911a, which is an area for drawing (displaying) an image, is set except for the left end and the right end. Note that the drawing area 911a is set to form a rectangle (including a square), for example. Further, FIG. 7 is simply illustrated for convenience of explanation.

  When the deflection angle of the movable plate 411a of the optical scanner 41 is constant, the deflection width of the laser beam LL in the light emission state changes according to the angle of the movable plate 421a of the optical scanner 42, and the laser beam LL scans. The position in the vertical direction (the position in the vertical direction of the drawing line L) on the display surfaces 91 a and 91 b to be displayed becomes longer as the distance from the projector 2 increases. Therefore, in the projector 2, the deflection angle of the movable plate 411a is adjusted according to the angle of the movable plate 421a. That is, as the vertical position (the vertical position of the drawing line L) on the display surfaces 91a and 91b scanned with the laser light LL is farther from the projector 2, the swing angle of the movable plate 411a is reduced. The fluctuation width of the laser beam LL in the light emission state is made constant along the vertical direction.

  In the calibration curve storage unit 57, the fluctuation width of the laser light LL is constant along the vertical direction in the light emission state, and the vertical direction on the display surfaces 91a and 91b of the laser light LL that scans the display surfaces 91a and 91b. A calibration curve such as a table or an arithmetic expression (function) indicating the relationship between the position (the position in the vertical direction of the drawing line L) and the deflection angle of the movable plate 411a is stored (stored). When an image is drawn, the calibration curve is used to calculate the target value of the deflection angle (target deflection angle) based on the vertical position on the display surfaces 91a and 91b of the laser light LL that scans the display surfaces 91a and 91b. ) The calibration curve can be obtained by calculation and is stored in advance in the calibration curve storage unit 57.

  In the projector 2, in the drawing area 911 a, the vertical interval between adjacent drawing lines L is constant for each odd-numbered drawing line L from the upper side, and similarly, each even-numbered drawing line from the upper side. For L, it is preferable to adjust the angle and angular velocity of the movable plate 421a so that the vertical interval between adjacent drawing lines L is constant. Thereby, the distortion of the image in the vertical direction can be prevented.

  In the present embodiment, for example, at the left end and the right end of the drawing area 911a at the start of drawing of each drawing line L, the vertical spacing between adjacent drawing lines L is constant. The angle of the movable plate 421a is adjusted, and the angular velocity of the movable plate 421a is set to a predetermined value. That is, for each drawing line L, the angle of the movable plate 421a is adjusted so that the vertical interval between adjacent drawing start points is constant, and the angular velocity of the movable plate 421a is set to a constant value for each drawing line L. To do. Note that the angular velocity of the movable plate 421a is set to be smaller as the vertical position of the drawing line L is farther from the projector 2. Thereby, it is possible to prevent distortion of the image in the vertical direction with relatively simple control.

Next, the operation (action) of the projector 2 when drawing an image on the display surface 91a of the screen 9a will be described. The same applies to the drawing on the display surface 91b.
First, video data is input to the projector 2. The input video data is temporarily stored in the video data storage unit 51, and an image is drawn using the video data read from the video data storage unit 51. In this case, drawing of the image may be started after all of the video data is stored in the video data storage unit 51, and after part of the video data is stored in the video data storage unit 51, Drawing may be started, and the video data storage unit 51 may store the video data that follows the drawing of the image.

  When drawing an image after a part of the video data is stored in the video data storage unit 51, first, video data of at least one frame, preferably two frames or more (for example, two frames). Is stored in the video data storage unit 51, and then image drawing is started. This is because the projector 2 draws an image by performing horizontal scanning in each of the forward and backward passes of the vertical scanning (hereinafter, also simply referred to as “reciprocating drawing in the vertical direction”). The drawing order of the video data from the video data storage unit 51 is reversed between when the image is drawn in the forward pass and when the image is drawn in the return pass of the vertical scan, so that the drawing of the image is started in the return pass of the vertical scan. This is because, in order to read the video data from the opposite side, at least one frame of video data used for drawing an image on the return path needs to be stored in the video data storage unit 51.

The drawing timing generation unit 53 generates drawing timing information and drawing line information, respectively. The drawing timing information is sent to the video data calculation unit 52, and the drawing line information is sent to the deflection angle calculation unit 55.
The drawing timing information includes drawing timing information and the like. Further, the drawing line information includes information on the vertical position (angle of the movable plate 421a) of the drawing line L for drawing. Note that the position of any part of the drawing line L may be set as the position in the vertical direction of the drawing line L, and examples include the left end, the right end, and the center.

Based on the drawing timing information input from the drawing timing generation unit 53, the video data calculation unit 52 reads the video data corresponding to the pixel to be drawn from the video data storage unit 51, performs various correction calculations, and the like. The luminance data of each color is sent to the light source modulator 54.
The light source modulation unit 54 modulates each light source 320r, 320g, 320b via each drive circuit 310r, 310g, 310b based on the luminance data of each color input from the video data calculation unit 52. That is, the light sources 320r, 320g, and 320b are turned on / off, the output is adjusted (increased / decreased), and the like.

  The angle detection unit 43 on the optical scanner 41 side detects the angle and the swing angle of the movable plate 411 a, and draws the information on the angle and the swing angle (angle information of the movable plate 411 a) in the drawing timing generation unit 53 of the distortion correction unit 5. And sent to the deflection angle calculation unit 55. Further, the angle detector 44 on the optical scanner 42 side detects the angle of the movable plate 421 a, and sends information on the angle (angle information of the movable plate 421 a) to the angle instruction unit 56 of the distortion correction unit 5.

  When the drawing of the current drawing line L is completed and information on the deflection angle of the movable plate 411a is input from the angle detection unit 43, the drawing timing generation unit 53 synchronizes with the angle indication unit 56 and then Target angle information (angle instruction) indicating the target angle of the movable plate 421a when the laser beam LL is irradiated to the drawing start point of the drawing line L for drawing is sent. The target angle of the movable plate 421a is set so that the vertical interval between adjacent drawing start points is constant. The angle instruction unit 56 compares the angle of the movable plate 421a detected by the angle detection unit 44 with the target angle of the movable plate 421a and performs correction so that the difference becomes zero. Drive data is sent to the drive means 427.

The driving unit 427 drives the optical scanner 42 based on the driving data (applies a voltage to the coil). Thereby, when the laser beam LL is irradiated to the drawing start point, the angle of the movable plate 421a becomes the target angle.
In the present embodiment, in each drawing line L, the angular velocity of the movable plate 421a may be constant from the drawing start point to the drawing end point, and the vertical scanning speed of the laser light LL may be constant. The angular velocity of 421a may be gradually changed, and the scanning speed of the laser beam LL in the vertical direction may be gradually changed.

In addition, the drawing timing generation unit 53 sends drawing line information, that is, information on the position in the vertical direction of the drawing line L to be drawn next, to the deflection angle calculation unit 55.
The deflection angle calculation unit 55 uses the calibration curve read from the calibration curve storage unit 57 and, based on the vertical position information of the drawing line L to be drawn next, which is input from the drawing timing generation unit 53. Next, the target deflection angle of the movable plate 411a in the drawing line L for drawing is obtained. Then, based on the information on the deflection angle of the movable plate 411a input from the angle detection means 43 and the target deflection angle of the movable plate 411a, the optical scanner is configured so that the deflection angle of the movable plate 411a becomes the target deflection angle. Drive data is sent to 41 drive means 417.

  Based on the driving data, the driving unit 417 applies an effective voltage having the same frequency as the resonance frequency of the optical scanner 41 to the coil 415 to cause a current to flow to generate a predetermined magnetic field. By changing the phase difference between 41 and the drive waveform, energy is supplied to the optical scanner 41, and conversely, energy is taken from the optical scanner 41. As a result, the deflection angle of the movable plate 411a that is in resonance is the target deflection angle. In this way, based on the information (detection result) of the deflection angle of the movable plate 411a detected by the angle detection means 43 and the target deflection angle (target value), the deflection angle of the movable plate 411a is the target deflection angle. The laser beam LL is sequentially scanned on each drawing line L in the drawing area 911a while the swing angle of the movable plate 411a is adjusted so as to draw an image.

  In addition, the drawing timing generation unit 53 manages whether a frame to be drawn is an odd frame (odd number frame) or an even frame (even number frame), so that the movable plate 421a The rotation direction (movement direction) and the reading order of the video data from the video data storage unit 51 are determined. That is, the video data reading order is reversed between when an image is drawn in an odd frame (vertical scanning forward path) and when an image is drawn in an even frame (vertical scanning backward path).

Further, the laser beam LL is scanned on the same line on the display surfaces 91a and 91b in the odd-numbered frame and the even-numbered frame. In other words, the laser beam LL is scanned so that each drawing line L in the odd frame matches each drawing line L in the even frame.
Specifically, for example, as shown in FIG. 7, for the first frame (odd-numbered frame), the drawing starts from the upper left, draws to the lower right zigzag, and the second frame (even-numbered frame) For the frame), the direction of rotation of the movable plate 421a is reversed, and drawing is performed from the lower right to the upper left in the opposite direction. Thereafter, similarly, the odd-numbered frame is drawn from the upper left to the lower right, and the even-numbered frame is drawn from the lower right to the upper left.

In this embodiment, the vertical scanning forward path is an odd frame and the vertical scanning backward path is an even frame. However, the present invention is not limited to this, and the vertical scanning backward path is an odd frame. The scanning forward path may be an even frame.
In the present embodiment, the drawing start position for the first frame is at the upper left, but is not limited thereto, and may be, for example, the upper right, the lower left, the lower right, or the like.
Further, the laser beam LL may be scanned on different lines on the display surfaces 91a and 91b in the odd-numbered frame and the even-numbered frame.

Here, the change with time of the deflection angle of the movable plate 411a and the change with time of the deflection angle of the movable plate 421a at the time of drawing the image are as follows.
In the horizontal scanning, as shown in FIG. 8, the swing angle of the movable plate 411a gradually increases from the minimum swing angle, reaches the maximum swing angle, gradually decreases, reaches the minimum swing angle, and then again. The operation is gradually increased, and thereafter the operation is repeated in the same manner. As described above, in the projector 2, the swing angle of the movable plate 411a does not change abruptly. Therefore, the swing angle of the movable plate 411a of the optical scanner 41 configured to operate using resonance can be adjusted easily and reliably. it can.

Further, in the vertical scanning, as shown in FIG. 9, after the swing angle of the movable plate 421a gradually increases from the minimum swing angle, reaches the maximum swing angle, gradually decreases, and then reaches the minimum swing angle. Then, it gradually increases again, and thereafter the operation is repeated in the same manner. As described above, in the projector 2, the swing angle of the movable plate 421 a does not change abruptly. Therefore, the swing angle of the movable plate 421 a of the optical scanner 42 can be adjusted easily and reliably. In addition, an image is displayed between a display period (drawing period) in which an image is drawn in an odd frame (vertical scanning forward path) and a display period in which an image is drawn in an even frame (vertical scanning backward path). A non-display period (non-drawing period) during which no drawing is performed is provided. In this display period, each timing such as a timing for starting drawing of the next frame can be adjusted.
And since the image is drawn both in the forward and backward passes of the scanning in the vertical direction, that is, when the movable plate 421a is rotated in a predetermined direction and when it is rotated in the opposite direction, the conventional method is used. A vertical blanking period becomes unnecessary, and the non-display period can be shortened. Thereby, a time aperture ratio (ratio of the period which draws an image) can be made high.

In other words, the vertical non-display period in one frame can be shortened by reciprocatingly drawing, thereby increasing the vertical time aperture ratio and drawing an image by performing horizontal scanning only in the forward path of vertical scanning. When the angular velocity (velocity) of the movable plate 411a is the same as the case, the number of frames (frame number) per unit time can be increased compared to the case of drawing an image only on the forward path. Thereby, it is possible to easily cope with a fast movement in a moving image. In other words, when the image is drawn by performing horizontal scanning only in the forward path of the vertical scanning and when the number of frames per unit time is the same, the angular velocity of the movable plate 411a is larger than when the image is drawn only in the forward path. Can be made smaller, whereby an image can be stably drawn. In the above case, when the angular velocity of the movable plate 411a is not changed, drawing with higher vertical resolution is possible.
Here, in practice, for example, the inertia (inertia moment) of the movable plates 411a and 421a of the optical scanners 41 and 42 may be large, and the movable plates 411a and 421a may not follow instantaneously. In such a case, for example, the drive current of the optical scanners 41 and 42 may be set to zero, or the optical scanners 41 and 42 may be driven in reverse phase (braking).

As described above, according to the projector 2, trapezoidal distortion of the image is prevented by the distortion correcting unit 5 without increasing the deflection angle of the movable plates 411a and 421a while increasing the time aperture ratio. be able to.
In addition, since the image is drawn by performing horizontal scanning in each of the forward path and the backward path of the vertical scanning, the swing angle of the movable plate 421a is suddenly changed when switching from the forward path to the backward path in the vertical scanning or when switching from the backward path to the forward path. Therefore, the deflection angle of the movable plate 421a can be adjusted easily and reliably.

(Modified example of projector operation)
Next, a modification of the projector 2 will be described based on FIG.
In the projector 2 shown in FIG. 10, the deflection width of the laser beam LL is not constant along the vertical direction in the light emission state, but the deflection width of the laser beam LL in the light emission state is the deflection angle of the movable plate 411a. Compared to the case where the above adjustment is not performed, the deflection angle of the movable plate 411a is adjusted so as to be aligned along the vertical direction. As a result, the upper width of the drawable area 912 where the image can be drawn is reduced, the shape of the drawable area 912 approaches a rectangle (including a square), and the non-drawn area can be reduced.
In the projector 2, a rectangular drawing area 911a is set on the display surfaces 91a and 91b, that is, in the drawable area 912, and the laser beam LL emitted from the light source unit 3 is projected (irradiated) into the drawing area 911a. Thus, the drive of the light source unit 3 is controlled. Thereby, the trapezoid distortion of an image can be prevented.

  Since the projector 2 as described above uses the optical scanners 41 and 42, the configuration is relatively simple. Further, since the projector 2 uses laser light, it is focus-free, can perform close-up projection, and can adjust the projection position to an arbitrary position without being limited to the installation position. Further, when laser light is used, an optical system such as a lens for making parallel light can be omitted or simplified, so that the light source unit 3 (light emitting unit) can be downsized, and the image forming apparatus 1 can be downsized. Can be achieved.

  Such a projector 2 is provided in the vicinity of the screens 9a and 9b, and displays (draws) images on the display surfaces 91a and 91b by proximity projection. Thereby, since the optical path length of the laser beam LL emitted from the projector 2 can be shortened, a denser image (high pixel image) can be displayed. In addition, the laser beam LL can be more reliably scanned at a desired position on the display surfaces 91a and 91b, and the laser beam LL emitted from the projector 2 can be prevented from being blocked by, for example, a pedestrian. it can. Therefore, a desired image can be displayed on the display surfaces 91a and 91b without being affected by the surrounding environment (population density or the like). In addition, arrangement | positioning of the projector 2 is not specifically limited, For example, you may arrange | position in the position far from the screen 9 (namely, it may not be a proximity | contact projection).

The display surface 91a as the first display unit and the display surface 91b as the second display unit are set so as not to overlap each other. Thereby, since the display surface 91a and the display surface 91b are recognized as separate areas, the presence of an image can be easily recognized.
In the embodiment, the display surface 91a and the display surface 91b are separated from each other, but the display surface 91a and the display surface 91b may be in contact with each other, and a part of the display surface 91a and the display surface 91b Some may overlap each other.

In this embodiment, as described above, the screen 9b is installed on the floor surface F1 of the floor F, and the screen 9a is installed on the wall surface W1 of the wall W orthogonal to the floor F. However, the projector 2 (image forming apparatus) 1) is installed on the same plane as the screen 9a (that is, on the wall surface W1).
Thereby, the optical path length of the light emitted from the projector 2 can be shortened compared to the case where the projector 2 is installed on a different surface from the installation surfaces of the display surfaces 91a and 91b. Therefore, the light emitted from the projector 2 can be prevented or suppressed from being blocked by, for example, a pedestrian. As a result, a desired image can be displayed on the first display surface and the second display unit without being influenced by the surrounding environment (population density or the like). Moreover, since the installation surface of the projector 2 is the wall surface W1, it can also prevent or suppress that the projector 2 obstructs a pedestrian's walk etc.

Further, the projector 2 and the display surface 91a are installed on the wall surface W1, and the display surface 91b is installed on the floor surface F1, so that the periphery of the image forming apparatus 1 is inside or outside the building having the wall surface W1 and the floor surface F1. It is possible to make it easier for a human being present to recognize the presence of an image. Therefore, for example, when an advertisement image such as a commercial or a promotion video is used as a display image, an excellent advertisement function can be exhibited.
Further, when the display surface 91a of the screen 9a is viewed in plan, the display surface 91b of the screen 9b is a line segment passing through the image forming apparatus 1 (projector 2) and the display surface 91a (a portion from which the light LL of the projector 2 is emitted). And a straight line passing through the center of the display surface 91a). Thereby, the distortion of the display surfaces 91a and 91b can be corrected relatively easily.

(Human sensor)
As shown in FIG. 2, the human sensor 7 includes a sensor unit 71, a storage unit 72, and a determination unit 73. Such a human sensor 7 has a function of detecting whether or not a person is present in each of the first detection area S1 and the second detection area S2 described later. . Such a human sensor 7 is accommodated in the housing 11 (however, a part of the sensor unit 71 may be exposed from the housing 11 so that the function can be exhibited). , Provided in the vicinity of the screen 9. In the present embodiment, the human sensor 7 is housed in the housing 11. However, the human sensor 7 is not limited to this, and the human sensor 7 may be provided separately from the housing 11.

  The sensor unit 71 can detect the presence or absence of a human near the sensor unit 71, and can measure the distance and direction between the sensor unit 71 and the detected human. The sensor unit 71 is not particularly limited as long as the above-described functions can be exhibited. For example, an infrared sensor using infrared rays or an ultrasonic sensor using ultrasonic waves can be used. Furthermore, a sensor in which an infrared sensor and an ultrasonic sensor are combined can also be used.

The infrared sensor detects the presence or absence of a human in the vicinity of the sensor unit 71 by detecting the temperature change using infrared rays when an object (human) having a temperature difference from the ambient temperature moves within the sensing area. It is a sensor that detects the distance to humans. On the other hand, the ultrasonic sensor transmits ultrasonic waves by the transmitter, receives the reflected waves by the receiver, and calculates the relationship between the time required from transmission to reception and the speed of sound, and thereby near the sensor unit 71 It is a sensor that detects the presence or absence of humans and the distance to humans.
Moreover, only those who exist in the area | region of a specific direction can be detected from the sensor part 71 by using what has directivity among these sensors individually or in combination.

In the storage unit 72, a first detection area S1 and a second detection area S2, which are areas for determining the presence or absence of a human being, are set.
As shown in FIG. 11, the first detection region S1 is set to include the screens 9a and 9b when viewed from the vertical line direction. In this way, by setting the first detection area S1 to include the screens 9a and 9b, it is possible to reliably detect the presence of humans near the screens 9a and 9b.

  The first detection region S1 has a semicircular shape centered on the central portion of the display surface 91a of the screen 9a when viewed from the vertical direction. Thereby, the distance to the edge of 1st detection area | region S1 can be made substantially equal in any direction of the radial direction starting from the center part of the display surface 91a. Therefore, it is possible to reliably detect the presence of a person near the screen 9a without missing it. The shape of the first detection region S1 is not particularly limited, and may be, for example, a rectangle or a polygon such as a positive direction, and may be a circle or a fan centered on the center of the display surface 91a of the screen 9a. It may be a mold.

  Although the size (radius) of the first detection region S1 varies depending on the size (size) of the display surface 91a of the screen 9a, the first detection region S1 is located at the most distal position from the screen 9a. It is preferable that the size is such that the image content displayed on the display surface 91a can be recognized (identified) even by a human being. As a result, all persons located in the first detection area S1 can recognize the contents of the image displayed on the display surface 91a. Here, “a degree that can be identified” means that, for example, when the image displayed on the display surface 91a is a human face, the gender, the approximate age, etc. can be discriminated, or the image displayed on the display surface 91a. If the image is a character, it means that the character can be recognized.

The second detection region S2 is set at a position distal to the screen 9a than the first detection region S1. Specifically, the second detection region S2 is set so as to be in contact with and surround the outer periphery (edge) of the first detection region S1. The second detection region S2 has a semicircular shape concentric with the first detection region S1.
The size (radius) of the second detection region S2 varies depending on the size (size) of the display surface 91b of the screen 9b, but the second detection region S2 is located at the most distal position from the screen 9b. It is preferable that the size is such that the image content displayed on the display surface 91b can be recognized (identified) even by a human being. As a result, all persons located in the second detection area S2 can recognize the contents of the image displayed on the display surface 91b.

  Here, when the radius of the first detection region S1 is RS1, and the radius of the outer periphery of the second detection region S2 is RS2, the relationship between RS1 and RS2 is not particularly limited, but RS1 is 0.4RS2 or more. It is preferably about 0.7RS2 or less. By setting RS1 in the numerical range as described above, the first detection region S1 and the second detection region S2 can be set in a well-balanced manner.

  When the sensor unit 71 detects the presence of a human being, the determining unit 73 determines that the human is stored in the storage unit 72 based on a separation distance between the human and the sensor unit 71 (hereinafter also simply referred to as “separation distance D”). It is determined which of the first detection area S1 and the second detection area S2 is stored. Then, the determination unit 73 transmits this determination result to the control means 8. Such determination by the determination unit 73 may be performed in real time (continuously) or intermittently.

  Specifically, the storage unit 72 stores the radius RS1 of the first detection region S1 and the radius RS2 of the outer periphery of the second detection region S2, and the determination unit 73 determines that the separation distance D is greater than the radius RS1. If it is smaller, it is determined that the person is located in the first detection area S1, and if the separation distance D is larger than the radius RS1 and smaller than the radius RS2, the person is located in the second detection area S2. Judge that In the present embodiment, since the sensor unit 71 is provided in the vicinity of the screen 9a, the separation distance D can be regarded as the separation distance between the screen 9a (the center of the display surface 91a) and the person. Therefore, according to the determination method as described above, it is possible to accurately determine in which of the first detection area S1 and the second detection area S2 the person is located. .

  The human sensor 7 has been described above, but the configuration of the human sensor 7 is not limited to the above configuration. For example, as the sensor unit 71, a sensor that cannot measure the separation distance from the detected person may be used. In this case, a first sensor and a second sensor having a wider effective detection area than the first sensor are prepared. The first sensor and the second sensor are arranged close to each other, the effective detection area of the first sensor is defined as a first detection area S1, and the effective detection area of the first sensor is changed from the effective detection area of the second sensor. The area excluding the effective detection area is defined as a second detection area S2. When both the first sensor and the second sensor detect the presence of a human, it is determined that the human is located in the first detection region S1, and only the second sensor is a human. If it is detected that a person is present, it may be determined that a person is located in the second detection area S2. In this case, the storage unit 72 can be omitted.

Further, for example, as the sensor unit 71, one or a plurality of first pressure sensors installed under the floor of the first detection region S1 and one or a plurality of sensors installed under the floor of the second detection region S2. A second pressure sensor may be used. In this case, if the first pressure sensor reacts, it is determined that a person is located in the first detection area S1, and if the second pressure sensor reacts, a person exists in the second detection area S2. What is necessary is just to judge that it is located. Also in this case, the storage unit 72 can be omitted.
The number of sensor units 71 is not limited to one as in the present embodiment, and two or more sensor units 71 may be arranged. This is advantageous when one sensor unit 71 cannot cover the entire area of the first detection area S1 and the second detection area S2.

(Control means)
The control means 8 controls the driving of the projector 2 based on the detection result of the human sensor 7 described above.
In particular, the control means (switching means) 8 has a function of switching between the first state and the second state of the projector 2 described above based on the detection result of the human sensor 7.

That is, the control means 8 displays an image on the display surface 91a based on whether or not a person exists in each of the first detection area S1 and the second detection area S2. The first state to be switched and the second state to display an image on the display surface 91b are switched.
Thereby, the display position of an image can be switched according to a human operation. As a result, it is possible to make it easier for a human to recognize the presence of an image.

  More specifically, the control means 8 sets the first state when the human sensor 7 detects the presence of a person in the first detection region S1, and the human sensor 7 detects the first detection. When the presence of a person is not detected in the area S1, the second state is set. Thereby, it is possible to make it easier for a person existing in the first detection region S1 to recognize the presence of the image on the display surface 91a. In particular, as described above, since the display surface 91a is set in the vicinity of the first detection region S1, it is easier for a person existing in the first detection region S1 to recognize the presence of the image on the display surface 91a. can do. This is because the display surface 91a is provided along the wall surface W1.

  Further, when the human sensor 7 detects the presence of a human in the second detection area S2, the control means 8 sets the second state, and the human sensor 7 has a human in the second detection area S2. If no presence is detected, the first state is assumed. Thereby, it is possible to make it easier for a person existing in the second detection region S2 to recognize the presence of the image on the display surface 91b. In particular, as described above, since the display surface 91b is set in the first detection area S1 (and outside the second detection area S2), the display surface 91b is displayed to a person existing in the second detection area S2. The presence of the image of the surface 91b can be more easily recognized. This is because the display surface 91b is provided along the floor surface F1.

  In addition, when the human sensor 7 detects the presence of a person in both the first detection area S1 and the second detection area S2, one of the control means 8 depends on the detection timing. Priority should be given to the detection of. For example, when the human sensor 7 detects the presence of a person in the second detection area S2 after the human sensor 7 detects the presence of a person in the first detection area S1, these detection states continue. Even if the human sensor 7 detects the presence of a person in both the first detection area S1 and the second detection area S2, the second state is set. On the contrary, when the human sensor 7 detects the presence of a person in the first detection area S1 after the human sensor 7 detects the presence of a person in the second detection area S2, these detection states are changed. Even if the human sensor 7 continues and detects the presence of a human in both the first detection area S1 and the second detection area S2, the first state is set.

  Further, when the human sensor 7 detects the presence of a person in both the detection areas of the first detection area S1 and the second detection area S2, the first state is determined without giving priority to one of the detection areas. The second state may be switched at a predetermined time interval. In such switching at predetermined time intervals, the state in which the human sensor 7 detects the presence of a person in both the first detection area S1 and the second detection area S2 is maintained for a predetermined time length or more. It may be done only when

  Further, when the human sensor 7 does not detect the presence of a person in both the first detection area S1 and the second detection area S2, either the first state or the second state may be set. Alternatively, the first state and the second state may be switched at predetermined time intervals. When switching at predetermined time intervals, the switching is performed when the human sensor 7 has not detected human presence in both the first detection area S1 and the second detection area S2 for a predetermined time length or more. It may be done only when maintained.

  When the human sensor 7 has not detected the presence of a person in the detection areas of both the first detection area S1 and the second detection area S2, the display surface 91a, The drive of the projector 2 can be controlled so that the image is not displayed on both of 91b. In other words, the projector 2 is configured such that an image is displayed on the display surfaces 91a and 91b only when the human sensor 7 detects the presence of a person in the first detection area S1 or the second detection area S2. Control the operation of

  By such control, useless driving of the projector 2 such as displaying an image on the display surfaces 91a and 91b even though there is no human who may recognize an image displayed on the display surfaces 91a and 91b. Can be prevented. That is, power saving driving of the image forming apparatus 1 can be achieved, and the life of the projector 2 can be extended by eliminating unnecessary driving of the projector 2.

  In addition, for example, when the presence of a person who has entered the first detection area S1 or the second detection area S2 is detected and an image is displayed on the display surfaces 91a and 91b, the person is displayed on the display surface 91a, There is a possibility that the user is interested in the image displayed suddenly on 91b and stares at the images displayed on the display surfaces 91a and 91b. For this reason, by performing the control as described above, it is possible to give a person who passes the vicinity of the screen 9 an interest (interest) with respect to the images displayed on the display surfaces 91a and 91b. When the image is an advertisement such as a commercial or a promotion video, an excellent advertising effect can be exhibited.

Further, the switching between the first state and the second state of the projector 2 by the control means 8 may be performed based only on whether or not a person is present in the first detection area S1. In this case, for example, when a person is present in the first detection area S1, the first state is set, and when no person is present in the first detection area S1, the second state is set.
Similarly, the switching between the first state and the second state of the projector 2 by the control unit 8 may be performed based only on whether or not a person is present in the second detection region S2. In this case, for example, when a person is present in the second detection area S2, the second state is set, and when no person is present in the second detection area S2, the first state is set.

  As described above, the state is switched between the first state and the second state based only on whether or not a person is present in one of the first detection region S1 and the second detection region S2. In addition, the display position of the image can be switched according to a human operation. As a result, it is possible to make it easier for a human to recognize the presence of an image. Further, an image can be displayed only when necessary, and as a result, power saving can be achieved.

According to the image forming apparatus 1 of the present embodiment as described above, by changing the position where the image is displayed, even if the areas of the display surfaces 91a and 91b are relatively small, the image forming apparatus 1 can be It is possible to make it easier for an existing person to recognize the presence of an image.
Also, by changing the position where the image is displayed, the expressive power of the image can be enhanced.

In particular, according to the image forming apparatus 1, since images are displayed on two mutually orthogonal surfaces (display surfaces 91a and 91b), it is possible to make a person existing in a wider range recognize the presence of the image. it can.
For these reasons, even if the image to be displayed is small, the image forming apparatus 1 makes it easy for a human to recognize the presence of the image, and can enhance the expressiveness of the image.

Second Embodiment
Next, a second embodiment of the image forming apparatus of the present invention will be described.
FIG. 12 is a diagram showing a second embodiment of the image forming apparatus of the present invention.
Hereinafter, the image forming apparatus according to the second embodiment will be described with a focus on differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the second embodiment is substantially the same as the first embodiment except that the screen is omitted. In FIG. 12, the same reference numerals are given to the same configurations as those in the above-described embodiment.

As shown in FIG. 12, the image forming apparatus 1 includes a display area (first display unit) W11 set on the wall surface W1 of the wall W, and a display area set on the floor surface F1 at a position different from the display area W11. (Second display section) An image is selectively displayed on F11.
Thus, by directly displaying the image on the wall W1 and the floor surface F1, it is not necessary to arrange a screen as in the first embodiment described above. Therefore, the cost can be reduced, and the image can be displayed anywhere on the wall surface W1 and the floor surface F1, so that the convenience of the image forming apparatus 1 is improved.
Also by such 2nd Embodiment, the effect similar to 1st Embodiment can be exhibited.

<Third Embodiment>
Next, a third embodiment of the image forming apparatus of the present invention will be described.
FIG. 13 is a diagram showing a third embodiment of the image forming apparatus of the present invention.
Hereinafter, the image forming apparatus according to the third embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.
The image forming apparatus according to the third embodiment is substantially the same as the second embodiment except that the arrangement of the first display unit, the second display unit, and the image forming apparatus is different. In FIG. 13, the same components as those in the above-described embodiment are denoted by the same reference numerals.

As shown in FIG. 13, the image forming apparatus 1 and the screen 9 a are provided on the wall surface W <b> 1 of the wall W. On the other hand, the screen 9b is provided on the ceiling surface C1 of the ceiling C.
That is, in the present embodiment, the screens 9a and 9b and the image forming apparatus 1 are installed so that the top and bottom are reversed in the first embodiment described above.
Such an image forming apparatus 1 includes a display surface (first display unit) 91a set along the wall surface W1, and a display surface (second display) set along the ceiling surface C1 at a position different from the display surface 91a. The display unit 91b is configured to selectively display an image. FIG. 13 illustrates an example in which images displayed on the display surfaces 91a and 91b are oriented in the same direction as in the first embodiment.

In this embodiment, since the optical path of the laser light LL emitted from the projector 2 can be set so as to avoid a region through which a human passes, the laser light LL emitted from the projector 2 is For example, it can prevent more reliably that it is obstruct | occluded by the pedestrian etc.
According to the third embodiment, the same effect as that of the first embodiment can be exhibited.

<Fourth embodiment>
Next, a fourth embodiment of the image forming apparatus of the present invention will be described.
FIG. 14 is a view showing a fourth embodiment of the image forming apparatus of the present invention, and FIG. 15 is a top view showing a detection area of a human sensor in the image forming apparatus shown in FIG.
Hereinafter, the image forming apparatus according to the fourth embodiment will be described with a focus on differences from the above-described embodiments, and description of similar matters will be omitted.
The image forming apparatus of the fourth embodiment is substantially the same as that of the first embodiment except that the arrangement of the first display unit, the second display unit, and the image forming apparatus is different. In FIG. 14, the same reference numerals are given to the same configurations as those in the above-described embodiment.

As shown in FIG. 14, the image forming apparatus 1 and the screen 9 a are provided on the wall surface W <b> 1 of the wall W. On the other hand, the screen 9b is provided on a wall surface W2 orthogonal to the wall surface W1 of the wall W.
That is, in the present embodiment, the screens 9a and 9b and the image forming apparatus 1 are installed so as to be rotated by 90 ° in the first embodiment described above.

  Such an image forming apparatus 1 includes a display surface (first display unit) 91a set along the wall surface W1 and a display surface (second display) set along the wall surface W2 at a position different from the display surface 91a. The display unit 91b is configured to selectively display an image. FIG. 14 illustrates an example different from the first embodiment so that the orientation of the images displayed on the display surfaces 91a and 91b can be easily seen.

  In the present embodiment, as shown in FIG. 14, the first detection region S1 is set to include the screen 9a (91a) when viewed from the vertical line direction (above). The second detection region S2 is set so as to include the screen 9b (91b) when viewed from the vertical direction (above). The first detection area S1 and the second detection area S2 are in contact with each other.

Further, each of the first detection region S1 and the second detection region S2 has a sector shape centered on the intersection line between the wall surface W1 and the wall surface W2 when viewed from the vertical direction.
The second detection area S2 is set so as not to overlap the first detection area S1 described above. As a result, it is possible to easily and reliably detect the person existing near the display surface 91a and the person existing near the display surface 91b independently.
In the present embodiment, the second detection region S2 has the same shape and size as the first detection region S1 described above.

A first state in which the detection sensor 7 detects the presence or absence of a human in the first detection region S1 and the second detection region S2 and displays an image on the screen 9a based on the detection result, and the screen 9b. The second state in which an image is displayed is selectively switched.
Specifically, for example, when the human sensor 7 detects the presence of a person only in the second detection area S2, the first state is set. Thereby, it is possible to display an image on the display surface 91a of the screen 9a and make it easier for a person facing the display surface 91a (wall surface W1) to recognize the presence and content of the image.

Further, when the human sensor 7 detects the presence of a person only in the first detection region S1, the second state is set. Thereby, it is possible to display an image on the display surface 91b of the screen 9b and make it easier for a person facing the display surface 91b (wall surface W2) to recognize the presence and content of the image.
Further, when the human sensor 7 detects the presence of a human at the same time in both the first detection area S1 and the second detection area S2, the first state and the second state are set at predetermined time intervals. The detection may be switched sequentially, or the detection timing may be switched in the same manner as described above, giving priority to the first or last detection.

Further, when the human sensor 7 does not detect the presence of a human in any of the first detection area S1 and the second detection area S2, the first state and the second state are set at predetermined time intervals. May be switched sequentially, or may be either the first state or the second state.
According to the fourth embodiment, the same effect as that of the first embodiment can be exhibited.

<Fifth Embodiment>
Next, a fifth embodiment of the image forming apparatus of the present invention will be described.
FIG. 16 is a diagram showing a fifth embodiment of the image forming apparatus of the present invention.
Hereinafter, the image forming apparatus according to the fifth embodiment will be described with a focus on differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus according to the fifth embodiment is substantially the same as the first embodiment except that the arrangement of the image forming apparatus and the screen is different. The image forming apparatus of the fifth embodiment is the same as that of the fourth embodiment described above except that the arrangement of the image forming apparatuses is different. In FIG. 16, the same reference numerals are given to the same components as those in the above-described embodiment.

As shown in FIG. 16, in the present embodiment, the screen 9a is provided on the wall surface W1 of the wall W and the screen 9b is disposed on the wall surface W2 orthogonal to the wall surface W1 of the wall W, as in the fourth embodiment described above. Is provided.
On the other hand, the image forming apparatus 1 (projector) is installed near the intersection line X between the wall surface W1 (first surface) and the wall surface W2 (second surface) on the lower side of the screens 9a and 9b. Yes.
In such an arrangement, in the first embodiment, instead of changing the center position of the scanning range in the vertical direction of the optical scanning unit 4, the center position of the scanning range in the horizontal direction of the optical scanning unit 4 is changed. By doing so, an image can be selectively displayed on the display surfaces 91a and 91b. More specifically, by changing the center position of the amplitude of the movable plate 411 of the optical scanner 41, an image can be selectively displayed on the display surfaces 91a and 91b.

Further, the separation distance between the display surface 91a and the projector 2 and the separation distance between the display surface 91b and the projector 2 are equal to each other. Thereby, the distortion of the image by the position of the display surfaces 91a and 91b differing can be eliminated. As a result, the distortion of the display surface 91a and the display surface 91b can be corrected relatively easily.
In particular, in the present embodiment, since the image forming apparatus 1A (projector) is installed in the vicinity of the intersection line X, the separation distance between the display surface 91a and the image forming apparatus 1A (projector), and the display surface can be relatively easily determined. The distance between 91b and the image forming apparatus 1A (projector) can be made equal.

Similar to the fourth embodiment described above, the image forming apparatus 1A detects the presence or absence of a human in the detection area (see FIG. 15), and displays the display surface (first display unit) based on the detection result. ) The image is selectively displayed on 91a and the display surface (second display unit) 91b.
According to the fifth embodiment, the same effect as that of the first embodiment can be exhibited.

<Sixth Embodiment>
Next, a sixth embodiment of the image forming apparatus of the present invention will be described.
FIG. 17 is a schematic plan view showing an optical scanner of a projector provided in an image forming apparatus according to a sixth embodiment of the present invention, FIG. 18 is a sectional view taken along line BB in FIG. 17, and FIG. FIG. 20 is a block diagram showing voltage applying means of the driving means provided in the optical scanner shown in FIG. 17, and FIG. 20 is generated by the first voltage generating section and the second voltage generating section provided in the voltage applying means shown in FIG. FIG. 21 is a diagram illustrating an example of voltage to be used, and FIG. 21 is a diagram for explaining the operation of the projector provided in the image forming apparatus according to the sixth embodiment of the present invention (a is a side view, b is a front view) It is. In the following, for convenience of explanation, the front side in FIG. 17 is referred to as “up”, the back side in FIG. 17 is referred to as “down”, the right side is referred to as “right”, and the left side is referred to as “left”. The upper side, the lower side is called “lower”, the right side is called “right”, and the left side is called “left”.

Hereinafter, the image forming apparatus according to the sixth embodiment will be described with a focus on differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the sixth embodiment is the first except that the configuration of the optical scanner provided in the projector is different and that the trajectory of scanning (horizontal scanning) in the first direction on the display surfaces 91a and 91b is not a straight line. This is almost the same as the embodiment. In FIG. 19 and FIG. 21, the same reference numerals are given to the same configurations as those of the above-described embodiment.

The optical scanning unit 4 has one optical scanner 45 of a so-called two-degree-of-freedom vibration system (two-dimensional scanning).
The optical scanner 45 includes a base 46 provided with a first vibration system 46a, a second vibration system 46b, and a support portion 46c as shown in FIG. 17, a counter substrate 47 disposed to face the base 46, a base 46, and the like. A spacer member 48 provided between the counter substrate 47, a permanent magnet 491, and a coil 492 are provided.

The first vibration system 46a includes a frame-shaped drive unit 461a provided inside the frame-shaped support unit 46c, and a pair of first connection units 462a that support the drive unit 461a on the support unit 46c. 463a.
The second vibration system 46b includes a movable plate 461b provided inside the drive unit 461a, and a pair of second coupling portions 462b and 463b that support the movable plate 461b on both sides of the drive unit 461a. Yes.
The drive unit 461a has an annular shape in a plan view of FIG. The shape of the drive unit 461a is not particularly limited as long as it has a frame shape. For example, the drive unit 461a may have a quadrangular ring shape in a plan view of FIG. A permanent magnet 491 is joined to the lower surface of the driving unit 461a.

Each of the first connecting portions 462a and 463a has a longitudinal shape and can be elastically deformed. The first connecting portions 462a and 463a connect the driving portion 461a and the supporting portion 46c so that the driving portion 461a can be rotated with respect to the supporting portion 46c. The first connecting portions 462a and 463a are provided coaxially with each other, and the drive portion 461a is located with respect to the support portion 46c around this axis (hereinafter referred to as “rotation center axis J3”). And is configured to rotate.
The first connecting portion 462a is provided with a piezoelectric element 465a for detecting the angle (the turning angle around the turning central axis J3) (behavior) of the driving portion 461a.

  The movable plate 461b has a circular shape in plan view of FIG. Note that the shape of the movable plate 461b is not particularly limited as long as it can be formed inside the drive unit 461a. For example, the shape of the movable plate 461b may be an ellipse or a quadrangle in a plan view of FIG. May be. A light reflecting portion 464b having light reflectivity is formed on the upper surface of the movable plate 461b.

Each of the second connecting portions 462b and 463b has a longitudinal shape and can be elastically deformed. The second connecting portions 462b and 463b connect the movable plate 461b and the driving portion 461a so that the movable plate 461b can be rotated with respect to the driving portion 461a, respectively. Such second connecting portions 462b and 463b are provided coaxially with each other, and the movable plate 461b is located with respect to the drive portion 461a around this axis (hereinafter referred to as “rotation center axis J4”). It is configured to rotate.
The second connecting portion 462b is provided with a piezoelectric element 465b for detecting the angle (rotation angle around the rotation center axis J4) (behavior) of the movable plate 461b.

As shown in FIG. 17, the rotation center axis J3 and the rotation center axis J4 are orthogonal to each other. Further, the centers of the drive unit 461a and the movable plate 461b are respectively located on the intersections of the rotation center axis J3 and the rotation center axis J4 in the plan view of FIG. Hereinafter, for convenience of explanation, an intersection of the rotation center axis J3 and the rotation center axis J4 is also referred to as an “intersection point G”.
As shown in FIG. 18, the base body 46 as described above is bonded to the counter substrate 47 via the spacer member 48. A coil 492 that generates a magnetic field acting on the permanent magnet 491 is provided on the upper surface of the counter substrate 47.

  The permanent magnet 491 passes through the intersection point G in the plan view of FIG. 17 and is inclined with respect to the rotation center axis J3 and the rotation center axis J4 (this line segment is referred to as “line segment M”). (Also called). Such a permanent magnet 491 has an S pole on one side in the longitudinal direction with respect to the intersection point G and an N pole on the other side. In FIG. 18, the left side of the permanent magnet 491 in the longitudinal direction is the S pole and the right side is the N pole.

  17, the inclination angle θ of the line segment M with respect to the rotation center axis J3 is preferably 30 to 60 degrees, more preferably 40 to 50 degrees, and approximately 45 degrees. Is more preferable. By providing the permanent magnet 491 in this manner, the movable plate 461b can be smoothly rotated around the rotation center axis J3 and the rotation center axis J4. In the present embodiment, the line segment M is inclined about 45 degrees with respect to the rotation center axis J3 and the rotation center axis J4.

  Further, as shown in FIG. 18, a concave portion 491 a is formed on the upper surface of the permanent magnet 491. The recess 491a is an escape portion for preventing contact between the permanent magnet 491 and the movable plate 461b. By forming such a recess 491a, it is possible to prevent the movable plate 461b from coming into contact with the permanent magnet 491 when the movable plate 461b rotates around the rotation center axis J3.

The coil 492 is formed so as to surround the outer periphery of the drive unit 461a in the plan view of FIG. Thereby, when the optical scanner 45 is driven, contact between the drive unit 461a and the coil 492 can be reliably prevented. As a result, the distance between the coil 492 and the permanent magnet 491 can be made relatively short, and the magnetic field generated from the coil 492 can be efficiently applied to the permanent magnet 491.
The coil 492 is electrically connected to the voltage application unit 493, and when a voltage is applied to the coil 492 by the voltage application unit 493, the respective axes of the rotation center axis J3 and the rotation center axis J4 from the coil 492. A magnetic field is generated in the axial direction perpendicular to.

  As shown in FIG. 19, the voltage applying means 493 includes a first voltage generator 493a that generates a first voltage V1 for rotating the movable plate 461b around the rotation center axis J3, and a movable plate 461b. A second voltage generator 493b that generates a second voltage V2 for rotating around the rotation center axis J4 is superimposed on the first voltage V1 and the second voltage V2, and the voltage is applied to the coil 492. And a voltage superimposing portion 493c to be applied.

Similarly to FIG. 9 of the first embodiment, the first voltage generator 493a has a first voltage V1 (vertical scanning) that periodically changes at a period T1 that is twice the frame frequency, as shown in FIG. Voltage).
The first voltage V1 has a waveform like a triangular wave. Therefore, the optical scanner 45 can perform vertical reciprocating scanning (sub scanning) of light effectively. Note that the waveform of the first voltage V1 is not limited to this. Here, the frequency (1 / T1) of the first voltage V1 is not particularly limited as long as it is a frequency suitable for vertical scanning, but is preferably 15 to 40 Hz (about 30 Hz).
In the present embodiment, the frequency of the first voltage V1 is different from the torsional resonance frequency of the first vibration system 46a configured by the drive unit 461a and the pair of first coupling units 462a and 463a. Has been adjusted.

On the other hand, as shown in FIG. 20B, the second voltage generator 493b generates a second voltage V2 (horizontal scanning voltage) that periodically changes at a period T2 different from the period T1. .
The second voltage V2 has a waveform like a sine wave. Therefore, the optical scanner 45 can perform main scanning of light effectively. Note that the waveform of the second voltage V2 is not limited to this.

The frequency of the second voltage V2 is not particularly limited as long as it is higher than the frequency of the first voltage V1 and is suitable for horizontal scanning, but is preferably 10 to 40 kHz. As described above, the frequency of the second voltage V2 is set to 10 to 40 kHz, and the frequency of the first voltage V1 is set to about 30 Hz as described above, so that the movable plate 461b can be moved at a frequency suitable for drawing on the screen. It can be rotated around the rotation center axis J3 and the rotation center axis J4. However, if the movable plate 461b can be rotated around each of the rotation center axis J3 and the rotation center axis J4, the combination of the frequency of the first voltage V1 and the frequency of the second voltage V2 can be obtained. There is no particular limitation.
In the present embodiment, the frequency of the second voltage V2 is adjusted to be equal to the torsional resonance frequency of the second vibration system 46b configured by the movable plate 461b and the pair of second connecting portions 462b and 463b. Has been. Thereby, the rotation angle of the movable plate 461b around the rotation center axis J3 can be increased.

When the resonance frequency of the first vibration system 46a is f ₁ [Hz] and the resonance frequency of the second vibration system 46b is f ₂ [Hz], f ₁ and f ₂ are f ₂ > f. ₁ is preferably satisfied, and more preferably f ₂ ≧ 10f ₁ is satisfied. As a result, the movable plate 461b is rotated more smoothly around the rotation center axis J3 at the frequency of the first voltage V1, and more smoothly at the frequency of the second voltage V2 around the rotation center axis J4. Can do.

The first voltage generation unit 493a and the second voltage generation unit 493b are each connected to the distortion correction unit 5 and driven based on a signal from the distortion correction unit 5. The voltage superimposing unit 493c is connected to the first voltage generating unit 493a and the second voltage generating unit 493b.
The voltage superimposing unit 493c includes an adder 493d for applying a voltage to the coil 492. The adder 493d receives the first voltage V1 from the first voltage generator 493a and receives the second voltage V2 from the second voltage generator 493b, and superimposes these voltages and applies them to the coil 492. It has become.

The optical scanner 45 configured as described above is driven as follows.
For example, the first voltage V1 as shown in FIG. 20A and the voltage V2 as shown in FIG. 20B are superimposed by the voltage superimposing unit 493c, and the superimposed voltage is applied to the coil 492 ( This superimposed voltage is also referred to as “voltage V3”.
Then, with the voltage corresponding to the first voltage V1 in the voltage V3, the magnetic pole that tries to attract the south pole side of the permanent magnet 491 to the coil 492 and the N pole side away from the coil 492, and the permanent The magnetic poles of the magnet 491 that try to move the S pole side away from the coil 492 and that try to attract the N pole side to the coil 492 are alternately switched. Thereby, the drive part 461a rotates around the rotation center axis J3 at the frequency of the first voltage V1 together with the movable plate 461b while twisting and deforming the first coupling parts 462a and 463a.

  The frequency of the first voltage V1 is set to be extremely lower than the frequency of the second voltage V2, and the resonance frequency of the first vibration system 46a is the resonance frequency of the second vibration system 46b. Designed lower than. Therefore, the first vibration system 46a is easier to vibrate than the second vibration system 46b, and the first voltage V1 causes the movable plate 461b to rotate around the rotation center axis J4. Can be prevented.

On the other hand, a magnetic field that attempts to attract the south pole side of the permanent magnet 491 to the coil 492 and to separate the north pole side from the coil 492 with a voltage corresponding to the second voltage V2 in the voltage V3, and a permanent The magnetic poles of the magnet 491 that try to move the S pole side away from the coil 492 and that try to attract the N pole side to the coil 492 are alternately switched. As a result, the movable plate 461b rotates around the rotation center axis J4 at the frequency of the second voltage V2 while twisting and deforming the second connecting portions 462b and 463b.
Since the frequency of the second voltage V2 is equal to the torsional resonance frequency of the second vibration system 46b, the movable plate 461b is predominantly rotated around the rotation center axis J4 by the second voltage V2. Can do. Therefore, it is possible to prevent the movable plate 461b from rotating around the rotation center axis J3 together with the drive unit 461a by the second voltage V2.

According to the optical scanner 45 as described above, laser light (light) can be scanned two-dimensionally with one actuator, and space saving of the optical scanning unit 4 can be achieved. For example, when a pair of optical scanners are used as in the first embodiment, the relative positional relationship between these optical scanners must be set with high accuracy, but this is not necessary in this embodiment. The manufacturing can be facilitated.
Further, in the present embodiment, unlike FIG. 7 of the first embodiment, as shown in FIG. 21, the laser light LL is emitted from the light source unit 3 in the light emission state and the display surface 91a, A plurality of drawing lines (scanning lines) L that are trajectories of the laser light LL on the display surfaces 91a and 91b when two-dimensionally scanning on the 91b are arranged in a zigzag manner and distorted.

Further, since the scanning line is distorted, the video data calculation unit 52 reads out from the video data storage unit 51 while calculating data corresponding to pixel data to be drawn on the line to be scanned, and draws the drawing timing generator 53. After performing various correction calculations based on the drawing timing information input from, luminance data of each color is sent to the light source modulator 54.
Regarding processing other than the above, the same processing as in the first embodiment is performed.
Also according to the sixth embodiment, the same effect as that of the first embodiment can be exhibited.

<Seventh embodiment>
Next, a seventh embodiment of the image forming apparatus of the present invention will be described.
FIG. 22 is a block diagram showing a schematic configuration of the seventh embodiment of the image forming apparatus of the present invention. FIG. 23 is a partial sectional side view showing a projector and driving means provided in the image forming apparatus shown in FIG. 24 is a top view for explaining the rotation of the projector by the driving of the driving means shown in FIG.

Hereinafter, the image forming apparatus according to the seventh embodiment will be described focusing on the differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the seventh embodiment is substantially the same as the first embodiment except that the switching method between the first state and the second state is different. In FIG. 22, the same components as those in the above-described embodiment are denoted by the same reference numerals.

As shown in FIG. 22, the image forming apparatus 1 </ b> B of the present embodiment includes a driving unit 6 that rotates the projector 2, and the control unit (switching unit) 8 is based on the detection result of the human sensor 7. And the drive of the drive means 6 is controlled.
As shown in FIG. 23, the light source unit (light emitting unit) 3 and the light scanning unit 4 of the projector 2 are supported by the support unit 21.

The support portion 21 has a shaft portion 22, and the shaft portion 22 is attached to the attachment portion 111 of the housing 11 via a bearing 23.
Thereby, the light source unit 3 and the optical scanning part 4 can be rotated around the predetermined axis line X1 together with the support part 21. Thus, by rotating the light source unit 3 and the optical scanning unit 4 integrally, the display position of the image can be changed without requiring adjustment of the alignment of the light source unit 3 and the optical scanning unit 4.

  In the present embodiment, the predetermined axis line X1 is set along a direction (horizontal direction) orthogonal to the second direction (vertical direction). More specifically, the predetermined axis X1 is parallel to or coincides with the rotation center axis J2 of the optical scanner 42. Accordingly, it is possible to change the display position of the image (switch between the first state and the second state) while suppressing distortion due to the difference in the display position of the image.

Such a support portion 21 is rotated by the driving means 6.
The driving unit 6 includes a first gear 61 provided on the support portion 21 described above, a second gear 62 that meshes with the first gear 61, and a motor 63 that rotates the second gear 62.
The first gear 61 is provided with a plurality of teeth formed along the circumferential direction of the shaft portion 22 (axis line X1).
On the other hand, the second gear 62 is attached to the shaft portion 631 of the motor 63, provided with a plurality of teeth along the circumferential direction of the shaft portion 631, and meshed with the first gear 61.

The motor 63 is attached to the attachment portion 111 and rotates the second gear 62.
More specifically, as shown in FIG. 24A, the motor 63 rotates the second gear 62 clockwise by a predetermined angle, thereby rotating the support portion 21 around the shaft portion 22 counterclockwise. In the first state. On the other hand, as shown in FIG. 24B, the motor 63 rotates the second gear 62 counterclockwise by a predetermined angle, thereby rotating the support portion 21 around the shaft portion 22 in the clockwise direction. And
The driving means 6 including such a motor 63 can make the image forming apparatus 1 relatively simple and inexpensive.
Also according to the seventh embodiment, the same effect as that of the first embodiment can be exhibited.

<Eighth Embodiment>
Next, an image forming apparatus according to an eighth embodiment of the present invention will be described.
FIG. 25 is a perspective view showing an optical scanner of a projector provided in the image forming apparatus according to the eighth embodiment of the present invention.
Hereinafter, the image forming apparatus according to the eighth embodiment will be described focusing on the differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the eighth embodiment is substantially the same as that of the first embodiment except that the switching method between the first state and the second state is different. The image forming apparatus of the eighth embodiment is substantially the same as the seventh embodiment described above except that the configuration of the driving unit is different. In FIG. 25, the same reference numerals are given to the same components as those in the above-described embodiment.

As shown in FIG. 25, in the image forming apparatus 1 </ b> B of the present embodiment, a vertical scanning optical scanner 42 is supported by a support portion 21.
The support portion 21 is attached to a shaft portion 631 of a motor 63 fixed to a housing (not shown), and the optical scanner 42 and the support portion 21 together with a predetermined axis line (specifically, an axis line coinciding with the rotation center axis J2). It is designed to rotate around.
Then, the control unit (not shown) controls the driving of the motor 63, whereby the image display position can be changed (switching between the first state and the second state).
Also according to the eighth embodiment, the same effect as that of the first embodiment can be exhibited.

<Ninth Embodiment>
Next, a ninth embodiment of the image forming apparatus of the present invention will be described.
FIG. 26 is a diagram illustrating a schematic configuration of a projector provided in the image forming apparatus according to the ninth embodiment of the invention.
Hereinafter, the image forming apparatus according to the ninth embodiment will be described focusing on the differences from the first embodiment described above, and description of similar matters will be omitted.
The image forming apparatus of the ninth embodiment is substantially the same as the first embodiment except that the switching method between the first state and the second state is different. In FIG. 26, the same reference numerals are given to the same components as those in the above-described embodiment.

As shown in FIG. 26, in the projector provided in the image forming apparatus of the present embodiment, the rotation parallel to the rotation center axis J2 is between the horizontal scanning optical scanner 41 and the vertical scanning optical scanner 42. A mirror 103 that can rotate around the central axis J3 is provided.
The mirror 103 includes a light reflecting portion 1031e that reflects the light reflected by the light reflecting portion 411e of the light scanner 41 toward the light reflecting portion 421e of the light scanner 42.

Then, by rotating the mirror 103 around the rotation center axis J3, the position where the light reflected by the light reflecting portion 1031e of the mirror 103 in the light reflecting portion 421e of the optical scanner 42 enters can be changed. Thereby, the optical path of the light reflected by the light reflecting portion 421e of the optical scanner 42 is shifted in the vertical direction (second direction), and as a result, the display position of the image is changed (the first state and the second state). Can be switched).
According to the ninth embodiment, the same effect as that of the first embodiment can be exhibited.

  The image forming apparatus of the present invention has been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each unit is replaced with an arbitrary configuration having the same function. can do. In addition, any other component may be added to the present invention. Further, the present invention may be a combination of any two or more configurations (features) of the above embodiments.

In the above-described embodiment, the image forming apparatus has been described as drawing an image on a screen or drawing an image on a wall, a floor, a ceiling, or the like. However, the present invention is not limited thereto. The transmitted / diffused light may be viewed from the opposite side using.
Note that the arrangement of the projector and the first and second display units is not limited to the above-described embodiment. For example, the projector may be installed on the floor surface or the ceiling surface, and the first display unit may be set on one of two wall surfaces orthogonal to each other and the second display unit may be set on the other.

  In the above-described embodiment, the configuration in which the first state and the second state can be switched by changing the center position of the scanning range of the light scanning unit of the projector has been described as an example. A projector including a pair of each of the scanning unit and the optical scanning unit may be used. In other words, in an image forming apparatus that includes a first projector that displays an image on the first display unit and a second projector that displays an image on the second display unit, the projectors are operated by alternately switching these projectors. Also, it is possible to switch between the first state and the second state.

In the first embodiment, a pair of optical scanners is used as the optical scanning unit. However, the present invention is not limited to this. For example, an optical scanner and a galvanometer mirror may be used. In this case, the galvanometer mirror is preferably used for vertical scanning.
In the present embodiment, the first direction is the “horizontal direction” and the second direction is the “vertical direction”. However, the present invention is not limited to this. For example, the first direction is the “vertical direction”. The second direction may be the “horizontal direction”.

In the above embodiment, the three dichroic mirrors are used to combine the red laser light, the green laser light, and the blue laser light to emit one laser light (light). However, the dichroic prism or the like is used. May be combined.
In the above-described embodiment, the light source unit 3 has been described as having a laser light source that emits a red laser, a laser light source that emits a blue laser, and a laser light source that emits a green laser. For example, a laser light source that emits a red laser, a laser light source that emits a blue laser, and a laser light source that emits an ultraviolet laser may be provided. In this case, the screen includes a phosphor that generates green fluorescence when irradiated with an ultraviolet laser. As a result, a full-color image can be displayed on the display surface.

  DESCRIPTION OF SYMBOLS 1, 1A, 1B ... Image forming apparatus 11 ... Housing 103 ... Mirror 1031e ... Light reflection part 111 ... Mounting part 2 ... Projector 21 ... Supporting part 22 ... Shaft part 23 ... Bearing 3 ... ... Light source unit 31r, 31g, 31b ... Laser light source 310r, 310g, 310b ... Drive circuit 320r, 320g, 320b ... Light source 32r, 32g, 32b ... Collimator lens 33r, 33g, 33b ... Dichroic mirror 4 ... ... optical scanning part 41 ... optical scanner 411 ... base 411a ... movable plate 411b ... support part 411c, 411d ... coupling part 411e ... light reflection part 412 ... spacer member 413 ... counter substrate 414 ... permanent Magnet 415 ... Coil 416 ... Voltage applying means 417 ... Driving means 42 ... Optical scanner 421a ... Movable plate 421e ... Light reflection part 427 ... Driving means 43 ... Angle detection means 431 ... Piezoelectric element 432 ... Electromotive force detection part 433 ... Angle detection part 44 ... Angle detection means 45 …… Optical scanner 46 …… Substrate 46a …… First vibration system 46b …… Second vibration system 46c …… Supporting portion 461a …… Drive portion 461b …… Movable plates 462a, 463a …… First connecting portion 462b , 463b …… Second connecting portion 464b …… Light reflecting portion 465a, 465b …… Piezoelectric element 47 …… Counter substrate 48 …… Spacer member 491 …… Permanent magnet 491a …… Concavity 492 …… Coil 493 …… Voltage application Means 493a... First voltage generating unit 493b... Second voltage generating unit 493c... Voltage superimposing unit 493d. …… Distortion correction means 51 …… Video data storage unit 52 …… Video data calculation unit 53 …… Drawing timing generation unit 54 …… Light source modulation unit 55 …… Deflection angle calculation unit 56 …… Angle instruction unit 57 …… Calibration curve storage Unit 6... Driving means 61... First gear 62... Second gear 63... Motor 631 .. Shaft portion 7 .. Human sensor 71 .. Sensor unit 72. ... Control means 9a, 9b ... Screen 91a, 91b ... Display surface 911a ... Drawing area 912 ... Drawable area J1, J2, J3, J4 ... Rotation center axis L ... Drawing lines S1, S2 ... Detection area W ... Wall W1, W2 ... Wall W11, F11, WF11, C11, WC11 ... Display area F ... Floor F1 ... Floor surface C ... Ceiling C1 ... Ceiling surface

Claims (16)

A first state in which an image is displayed by scanning light on the first display unit set on the first surface, and a first state orthogonal to the first surface at a position different from the first display unit. A projector configured to be switchable between a second state in which an image is displayed by scanning light on a second display unit set on the second surface;
An image forming apparatus comprising switching means for switching between the first state and the second state of the projector. The projector includes a light emitting unit that emits laser light;
An optical scanning unit that scans laser light emitted from the light emitting unit in a first direction and a second direction orthogonal to each other,
The first state and the second state can be switched by changing the center position of the scanning range of the laser beam in the first direction and / or the second direction of the optical scanning unit. The image forming apparatus according to claim 1. The optical scanning unit is provided with a movable plate provided with a light reflecting unit for reflecting the laser light emitted from the light emitting unit so that the movable plate can be rotated about one axis or two axes orthogonal to each other. An optical scanner that scans the display surface with the light reflected by
The image forming apparatus according to claim 2, wherein the first state and the second state can be switched by changing a center position of an amplitude in the rotation of the movable plate. A human sensor for detecting whether a human is present in a detection region set in the vicinity of the first display unit;
The image forming apparatus according to claim 1, wherein the switching unit switches between the first state and the second state based on a detection result of the human sensor. A human sensor for detecting whether a human is present in a detection region set in the vicinity of the second display unit;
The image forming apparatus according to claim 1, wherein the switching unit switches between the first state and the second state based on a detection result of the human sensor. For each area of the first detection area set in the vicinity of the first display section and the second detection area set in the vicinity of the second display section, a human is included in the area. Has a human sensor to detect whether or not
The image forming apparatus according to claim 1, wherein the switching unit switches between the first state and the second state based on a detection result of the human sensor.   The switching means is in the first state when the human sensor detects the presence of a human in the first detection area, and the human sensor is in the first detection area. The image forming apparatus according to claim 6, wherein when the presence is not detected, the second state is set.   The switching means is in the second state when the human sensor detects the presence of a human in the second detection area, and the human sensor is in the second detection area. The image forming apparatus according to claim 6, wherein when the presence is not detected, the first state is set.   The first display unit and the second display unit are set in at least one of the first detection region and the second detection region, respectively. The image forming apparatus described in 1.   The image forming apparatus according to claim 1, wherein the projector includes a distortion correction unit that corrects distortion of an image displayed on each of the first display unit and the second display unit.   The image forming apparatus according to claim 1, wherein the first display unit and the second display unit are set so as not to overlap each other.   The image forming apparatus according to claim 1, wherein the projector is installed on the first surface or the second surface.   The image forming apparatus according to claim 12, wherein the second display unit is located on a line segment passing through the projector and the first display unit when the first display unit is viewed in plan. .   The image forming apparatus according to claim 1, wherein a separation distance between the first display unit and the projector and a separation distance between the second display unit and the projector are equal to each other.   The image forming apparatus according to claim 14, wherein the projector is installed in the vicinity of an intersection line between the first surface and the second surface.   The image according to any one of claims 1 to 15, wherein each of the first surface and the second surface is set along a wall, a floor, a ceiling, or a surface of a screen installed on the wall, the floor, or the ceiling. Forming equipment.

Images