JP2005077912A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which detects the relative angle between an image projecting device and an image/sound signal processing device, selectively switches the sound output to a right channel loudspeaker or to a left channel loudspeaker, and switches the sound emission direction to a direction directed toward the audience, thereby providing best sound. <P>SOLUTION: The image projector 1 incorporates an image projecting device 100 and a DVD reproducing device 200 which are movably unitized into a single body. The projector 1 includes a right-channel loudspeaker RSP and a left-channel loudspeaker LSP provided in the image projecting device 100; a rotary encoder 150 or a tilt sensor 400, which detects the relative angle between the image-projecting device 100 and the DVD reproducing device; and a loudspeaker drive device 500 which changes the sound emission directions of the right-channel loudspeaker RSP and left-channel loudspeaker LSP, based on the result of the detection. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, the image projection apparatus and the image / audio signal processing apparatus are unitized so as to be movable, the relative angle between the image projection apparatus and the image / audio signal processing apparatus is detected, and the audio signal output is output to the right channel speaker and the left channel. The present invention relates to a projector that selectively switches to a channel speaker and switches a sound emitting direction to a direction toward a viewer.

Conventionally, projectors have been adopted in home theaters and the like, not only projecting images,
Audio can also be output, but for that purpose a speaker is built in. In recent years, a device that combines a DVD (Digital Versatile Disc) playback device and a projector to output more advanced and realistic images and sound has been proposed.
For this reason, stereo speakers are often used as speakers. Such stereo speakers are attached to the inside or outside of the projector housing so that the right channel speaker is on the right side and the left channel speaker is on the left side in the projection direction of the projector.

Place the projector on a desk, etc., and externally as an image / audio signal processing device, such as a DVD
When the playback device is connected and the operator operates the remote control to instruct “desktop mode”, the projector is instructed to “normal display”, and then the DVD playback device displays an image.
When the audio playback is started, the image signal of the DVD playback device is input to the image input terminal of the projector, the right channel audio signal is input to the right channel audio input terminal Rin, and the left channel The left channel audio signal is input to the audio input terminal Lin.

Two other types of use of the projector are known: ceiling (ceiling) and rear projection. In this type of usage, the image is reversed from the left and right when viewed from the viewer,
Upside down. Therefore, in such a case, the “Ceiling Mode” and “Rear Projection Mode” are instructed, and the image is projected in the same state as the desktop mode. Input is selectively switched to the channel speaker.
As described above, there is known a projector that attempts to make the image and sound output the same as that in a normal, that is, “desktop” state by instructing the usage pattern of the projector (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-290877 (9th to 11th pages, FIGS. 1 and 4)

In Patent Document 1, the right channel signal and the left channel signal of stereo sound can be switched in accordance with the usage pattern of the projector. The usage pattern of this projector is “desktop mode”, “ceiling mode”, “ As in the “rear projection mode”, there is a problem that the viewer must give an instruction every time it is used.
Further, when viewing an image or sound output from the projector, the position of the viewer is not specified with respect to the position of the speaker, and is arbitrary. Therefore, there is a case where the sound emission direction of the speaker is not directed to the viewer's position, and it is possible that a sound with a sense of reality cannot be obtained.

  An object of the present invention is to unitize an image projection device and an image / audio signal processing device so as to be movable, detect a relative angle between the image projection device and the image / audio signal processing device, and output an audio output to a right channel speaker and To provide a projector that selectively switches to a left channel speaker and switches the sound emission direction to a direction toward the viewer.

The projector of the present invention is a projector in which an image projection device and an image / audio signal processing device are movably unitized, and includes a right channel speaker and a left channel speaker provided in the image projection device, and the image projection. An angle detection device for detecting a relative angle between the device and the image / audio signal processing device, and a speaker driving device for changing the sound emission direction of the right channel speaker and the left channel speaker based on a detection result of the angle detection device And is provided.
Here, as the image projection apparatus, an image projection apparatus using an LCD (Liquid Crystal Display) or DMD (Digital Micromirror Device: trademark of Texas Instruments) can be employed.
As the image / audio signal processing device, a DVD (Digital Versatile Disc) playback device or a VTR (Video Tape Recorder) can be employed.
As the angle detection device, a rotary encoder that detects a horizontal movement angle and a tilt sensor that detects a tilt angle in the vertical direction can be adopted.

According to the present invention, the image projection device and the image / audio signal processing device are, for example, mounted on the image / audio signal processing device and connected by a signal line, a power line, and the like. This image projection device can be rotated in the horizontal direction and tilted in the vertical direction.
Accordingly, when the image projection device is rotated in the horizontal direction, the angle at which the image projection device is rotated is measured by any angle detection device such as a rotary encoder or a tilt sensor, and the result is obtained, for example, by an MCU (microcomputer unit). Since the speaker driving device is driven and the sound emission direction of the right channel speaker and the left channel speaker is directed to the viewer, the sound is heard from the direction favorable for the viewer (including the operator). Can enjoy a sense of reality.

  In the present invention, the image projection device is provided so as to be rotatable in a horizontal direction with respect to the image / sound signal processing device, and based on a detection result in a planar direction of the angle detection device, the right channel speaker and the left channel It is preferable that a speaker driving device that changes the sound output direction of the speaker is provided.

For example, when the image projection apparatus is rotated 90 degrees or more in the horizontal direction with respect to the image / audio signal processing apparatus, the sound emission direction of the left and right speakers is directed in the opposite direction from the initial direction.
At this time, according to the present invention, the sound emission direction of the left and right speakers can be rotated by, for example, 180 degrees by the speaker driving device, and the sound can be heard from the front. In addition, since the sound output direction of the left and right speakers can be automatically switched in accordance with the rotation angle of the image projection device detected by the angle detection device, the sound is always heard from the best direction for the viewer. Can do.

  In the projector according to the aspect of the invention, the image projection device may be tilted in a vertical direction with respect to the image / audio signal processing device, and based on a detection result of the tilt angle of the angle detection device, the right channel speaker and the It is preferable that a speaker driving device that changes the sound output direction of the left channel speaker is provided.

According to this invention, the image projection apparatus has a structure that can change the angle in the vertical direction with respect to the image / audio signal processing apparatus, that is, the inclination angle can be adjusted. The inclination angle is measured by, for example, an inclination sensor, and the sound emission direction in the vertical direction of the right channel speaker and the left channel speaker can be switched according to the result, so that the audio is heard from the best direction for the viewer. be able to.
At this time, the directions of the left and right speakers described above are preferably horizontal with respect to the image / audio signal processing apparatus, but it is more preferable that the viewer can appropriately set the direction.

  In the present invention, based on the detection result of the angle detection device, the sound output direction of the right channel speaker and the left channel speaker is set to the direction of the image / audio medium insertion outlet provided in the image / audio signal processing device. It is desirable to turn.

  According to the present invention, the image / audio signal processing apparatus is, for example, a DVD playback apparatus, and an image / audio signal is output to the image projection apparatus by inserting a disk, which is an image / audio medium, into the apparatus. . Therefore, the operator is often in the direction of the insertion outlet of the disc. Therefore, if the sound emission direction of the right channel speaker and the left channel speaker is set so as to face the insertion outlet of the disc corresponding to the detection result of the angle detection device, the sound emission of the left and right speakers is generally reduced. The sound direction is directed toward the viewer, and a sound that is favorable to the viewer can be heard.

  In the present invention, a projector in which an image projection device and an image / audio signal processing device are movably unitized, the right channel speaker and the left channel speaker provided in the image / audio signal processing device, and the image An angle detection device that detects a relative angle between the projection device and the image / audio signal processing device, and a right channel audio signal and a left channel output from the image / audio signal processing device based on a detection result of the angle detection device And an audio signal switching section that selectively switches and outputs an audio signal to the right channel speaker and the left channel speaker.

  According to the present invention, when the right channel speaker and the left channel speaker are mounted in the image / audio signal processing device, when the image projection device is rotated in the plane direction (horizontal direction) by 90 degrees or more, the operator Is directed to the image projection direction, the right channel speaker is moved to the left side of the operator, and the left channel speaker is moved to the right side. At this time, the audio signal switching unit switches the output of the right channel audio signal to the left channel speaker and the output of the left channel audio signal to the right channel speaker. Can be obtained.

  In the present invention, an audio reflector that reflects audio output from the right channel speaker and the left channel speaker is provided on the external side surface of the image / audio signal processing device so as to be movable and rotatable. It is preferable.

According to the present invention, the sound reflecting plate for reflecting the sound from the speaker is provided in the vicinity of the sound emitting portion of each of the left and right speakers, and when the image projection device is rotated in the horizontal direction, the sound is reflected. By moving or rotating the reflector in the direction in which the sound is reflected toward the viewer, the sound can be heard from the best direction for the viewer.
Even when the image projection apparatus is not rotated, the position of the viewer varies, so the audio reflector can be moved or rotated in an arbitrarily selected direction with respect to the position of the viewer. Can listen to the voice from the best direction.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 8 show the projector according to the first embodiment, FIGS. 9 and 10 show the projector according to the second embodiment, and FIG. 11 shows the projector according to the third embodiment.

  FIG. 1 is a configuration diagram illustrating the configuration of the projector according to the first embodiment. In FIG. 1, the projector 1 of this embodiment is roughly divided into a DVD playback device 200 as an image / audio signal processing device, an image signal output from the DVD playback device 200, and a projected image on a screen 300. The image projector 100 is configured to emit an audio signal from a speaker.

The image projection apparatus 100 is divided into an audio processing system, an image processing system, and a control system. Of these, the audio processing system is an audio input terminal 101 (Rin) for inputting an audio signal from the DVD playback apparatus 200. ), 102 (Lin), amplifiers 105, 106 and 107, 108 for amplifying the audio signal, the right channel speaker RSP and the left channel speaker LSP of the stereo speaker which is a built-in speaker, and the audio signal is output to the outside. Audio output terminals Rout and Lout.
The built-in speakers RSP and LSP are attached to the outside of the housing of the image projection apparatus 100 (see FIG. 2).

  The image processing system also includes an illumination optical system 132 for outputting illumination light, a liquid crystal light valve 134 for forming image light, a projection optical system 136 for projecting image light onto the screen 300, and a DVD. An image input terminal 131 for inputting an image signal from the reproduction apparatus 200, an image processing unit 140 for processing the image signal, and a liquid crystal driving circuit for driving the liquid crystal light valve 134 based on the processed image signal 142.

  As will be described later, the image projection apparatus 100 is placed on the upper surface of the DVD reproduction apparatus 200 (see FIG. 2), but the image projection apparatus 100 may be rotated in the plane direction with respect to the DVD reproduction apparatus 200. Can be tilted. At this time, a rotary encoder 150 for detecting (measuring) the rotation angle and an inclination sensor 400 for detecting (measuring) the inclination angle are provided, and these measurement results are taken in, and the movement angle from the initial position is calculated. In addition, an MCU (microcomputer unit) for driving and controlling motors 111, 112 and 113, 114 for judging the result and switching the sound emission direction of the right channel speaker RSP and the left channel speaker LSP is provided. .

Although not shown, the DVD playback apparatus 200 includes an image playback processing section that performs playback processing of an image medium, an image output terminal 211 that outputs an image signal to the image projection apparatus 100, an audio playback processing section, and an audio signal that is output from the image projection apparatus 100 Are provided with audio signal output terminals 212 (Rout) and 213 (Lout).
Further, a power supply terminal (not shown) for obtaining power from the image projection apparatus 100 is also provided.

  FIG. 2 is a perspective view illustrating an outline of the projector 1 according to the first embodiment. In FIG. 2, the image projection device 100 is placed on the upper surface of the DVD playback device 200. The image projection device 100 and the DVD playback device 200 are configured to be concavo-convexly fitted at substantially the center of each, and set so as to be rotatable in the plane direction and inclined in the vertical direction (see FIGS. 5 and 8). In the image projection apparatus 100, the sound processing system, the image processing system, and the control system described above are housed in a housing 170 (see FIG. 5), but a part of the projection optical system 136 protrudes from the housing 170. Has been.

Further, a side surface of the DVD playback apparatus 200 is provided with a medium insertion outlet 210 for inserting or ejecting a medium (disc) for DVD playback. Stereo speakers are attached to both sides of the image projection apparatus 200 across the projection optical system 136. Viewing the direction of the projection optical system 136 from the medium insertion outlet 210, the right speaker is the right channel speaker RSP and the left speaker is the left channel speaker LSP.
In general, when operating a projector, a disk is often inserted and used from the medium insertion outlet 210, so the operator is often on the medium insertion outlet 210 side, so the right channel speaker RSP, The sound outlet 115 (the LSP side is not shown) of the left channel speaker LSP is directed toward the operator, that is, toward the medium insertion outlet 210.

  It is preferable that the image projection apparatus 100 can be used by changing the direction of the projection projection system 136 with respect to the DVD apparatus 200 in accordance with the direction of the screen, the layout of the room, and the like. At this time, it is preferable that sound can be heard in accordance with the projected image, and it is desirable that the sound emission direction of the speaker be directed to the operator (viewer) depending on the orientation of the image projection apparatus 100. In that case, it is required to detect how much the image projection apparatus 100 has moved (rotated).

Next, the structure of a means for detecting the rotation angle of the image projection apparatus 100 in the planar direction with respect to the DVD playback apparatus 200 will be described.
FIG. 3 shows an AA cross section of the image projection apparatus 100. In FIG. 3, a fixed gear 222 provided with a through hole 227 is planted and fixed perpendicularly to the upper surface of the housing 221 in the approximate center of the DVD playback apparatus 200. The fixed gear 222 includes a first step 223 planted in the housing 221, a second step 224 slightly protruding in the vertical direction from the first step 223, and the image projection device 100. A gear portion 225 is formed extending to the inside and formed on the outer periphery. Further, the outer peripheral front end portion of the gear portion 225 is provided with a tapered portion 226 having a thin front end.

  A concave portion 171 into which the fixed gear 222 planted in the DVD reproducing device 200 is inserted is formed at a substantially central portion of the housing 170 of the image projection device 100. The concave portion 171 and the outer periphery of the fixed gear 222 are free from play. The image projection apparatus 100 can rotate with the fixed gear 222 as the center of rotation. A through hole 172 having substantially the same size as the through hole 227 provided in the fixed gear 222 is provided at the bottom of the recess 171. The gear portion 225 of the fixed gear 222 is meshed with the rotor 180 of the rotary encoder 150 provided in the image projection device 100.

  The rotor 180 is rotatably supported between the upper plate 186 and the lower plate 187. The upper plate 186 and the lower plate 187 hold a hole for supporting the rotor 180 as a bearing, a light receiving element 184, and a light emitting element 185, respectively. The rotor 180, the light emitting element 185, and the light receiving element 184 constitute an optical rotary encoder 150.

  FIG. 4 is a perspective view showing the structural principle of the optical rotary encoder 150. In FIG. 4, the outer periphery of the rotor 180 is formed with a gear 181 having substantially the same module as the gear portion 225 of the fixed gear 222 described above, and a shaft portion 182 is planted perpendicularly to the rotor at the center. Between the gear 181 and the gear 181, slits 183 are radially formed from the shaft portion 182 over the entire circumference. A light emitting element 185 and a light receiving element 184 are provided in the front and back direction of the rotor 180 so that their optical axes coincide with each other. As the rotor 180 rotates, the light emitted from the light emitting element 185 passes through the slit 182 and is received and detected by the light receiving element 184, and the rotation angle of the rotor 180 can be measured. The measurement data is input to the MCU (see FIG. 1), and the rotation angles of the right channel speaker RSP and the left channel speaker LSP are calculated based on the measurement data, and motors 520 and 510 (FIG. 7, FIG. 7) described later are calculated. Drive).

  In FIG. 3, a pair of support portions 173 protrude from both ends of the bottom surface of the housing 170 opposite to the projection optical system 136, and the inclination of the image projection apparatus 100 is adjusted below the projection optical system 136. A foot 190 is provided.

The foot 190 is provided with a screw portion 191 that is screwed with the housing 170, a knob 192, and a support portion 193 that is in contact with the housing 221. By rotating the knob 192, the amount of protrusion of the foot 190 from the housing 170 can be adjusted to tilt the image projection apparatus 100. The support portions 193 and 173 slide with the housing 221 when the image projection apparatus 100 is rotated. Therefore, the support portions 193 and 173 are finished smoothly so that the friction coefficient is reduced, or a ball, a roller, or the like is provided at the tip. It is preferable.
Although not shown, a stopper is provided on the casing 221 of the DVD playback apparatus 200 so that the image projection apparatus 100 does not rotate more than 180 degrees (clockwise and counterclockwise) from the reference position.

  In the housing 170 of the image projection apparatus 100, an inclination sensor 400 is provided on an extension line connecting the foot 190 and the rotor 180. As will be described later, the tilt sensor 400 has a cylindrical shape with a circular cross section, and is mounted with its longitudinal direction perpendicular to the aforementioned extension line. The inclination angle of the image projection apparatus 100 is measured by the inclination sensor 400.

Next, a state where the image projection apparatus 100 is tilted will be described.
FIG. 5 is a cross-sectional view showing a state in which the image projecting apparatus 100 is tilted by adjusting the foot 190. In FIG. 5, when the knob 192 of the foot 190 is rotated, the image projection apparatus 100 is inclined with the support 173 as a fulcrum. At this time, since the rotor 180 is mounted integrally with the image projection apparatus 100, the rotor 180 is inclined together with the image projection apparatus 100. The rotor 180 inclines while meshing with the gear portion 225 formed on the fixed gear 222 planted in the DVD playback device 200, but since the tip of the gear portion 225 is provided with a taper 226, Even if the center distance from the fixed gear 222 due to the inclination is slightly shifted (the center distance approaches), the meshing state can be maintained.

The relationship among the rotor 180, the light emitting element 185, and the light receiving element 184 does not change between when the image projection apparatus 100 is in a horizontal state and when it is in an inclined state, and by rotating the image projection apparatus 100, the rotor 180 rotates. The rotation angle can be measured.
Further, the inclination of the image projection apparatus 100 can be measured by the inclination sensor 400.

  FIG. 6 is a cross-sectional view showing the structural principle of the tilt sensor 400. 6A shows a horizontal state, and FIG. 6B shows a state inclined in the direction of arrow B in the drawing. In FIG. 6, the tilt sensor 400 is sealed by putting a liquid 410 in a cylindrical container 402 about half the volume. A pair of capacitors 420 and 430 are formed on the inner end surface of the container 402. The tilt sensor 400 has a structure in which the change in capacitance caused by the liquid in which the two capacitors 420 and 430 arranged in line symmetry with respect to the tilt axis 405 are enclosed is regarded as a tilt. Although the tilt axis 405 is tilted and a difference in capacitance between the capacitors 420 and 430 is generated by the tilt, the tilt angle is calculated by an electronic circuit built in the tilt sensor 400 (not shown). The result is input to the MCU (see FIG. 1).

  As described above, it is calculated by the MCU based on the rotation angle and tilt angle data of the image projection apparatus 100 measured by the rotary encoder 150 and the tilt sensor 400, and the right channel speaker RSP and the left channel speaker LSP are connected to the viewer (that is, the operator). And the sound outlet 115 of the speaker is directed in the direction in which the medium insertion outlet 210 is located.

Next, the driving device 500 for the right channel speaker RSP and the left channel speaker LSP will be described with reference to FIG. Although the right channel speaker RSP and the left channel speaker LSP have different mounting directions, the structure is the same, so the right channel speaker RSP will be described as an example.
FIG. 7A is a cross-sectional view of a main part showing the structure of the speaker driving device 500, and FIG. In FIG. 7, the right channel speaker RSP is screwed and fixed to the speaker fixing plate 501 by two screws 502. The first gear 503 is fixed to the rotating shaft 506 at the end of the speaker fixing plate 501 opposite to the speaker RSP (see FIG. 7B). The rotating shaft 506 has a step on the opposite side of the first gear 503 across the speaker fixing plate 501 and is inserted into the second speaker fixing plate 505. The rotating shaft 506 and the speaker fixing plate 501 are firmly fixed, and the rotating shaft 506 and the second speaker fixing plate 505 are loosely fitted so as to be rotatable.

  The second speaker fixing plate 505 is provided with a second gear 504 that meshes with the first gear 503, and this second gear 504 is joined to the rotation shaft of the first motor 510 to rotate the first motor 510. Rotate with. At this time, when the first motor 510 is rotated by an instruction from a motor drive control circuit (built in the MCU, see FIG. 1), the second gear 504 is rotated (in the direction of arrow C in the figure), and the first gear 503 is also rotated. The When the first gear 503 is rotated, the first gear 503 and the speaker fixing plate 501 are fixed, and the rotating shaft 506 and the second speaker fixing plate 505 are loosely fitted. Is swung in the direction of arrow D about the rotation shaft 506. That is, the right channel speaker RSP is swung, and the direction of the sound output port 115 is changed.

The second speaker fixing plate 505 on which the right channel speaker RSP, the first motor 510, the first gear 503, and the second gear 504 are mounted is bent in an L shape in cross section, and is a surface along the casing 170. In addition, it is fixed to the rotating shaft 521 of the second motor 520 that penetrates the housing 170. The second motor 520 is fixed inside the housing 170. The housing 170 and the rotating shaft 521 are loosely fitted, but a spring 522 is provided between the housing 170 and the second speaker fixing plate 505, and the right channel speaker is provided by the elastic force of the spring 522. The elastic force is set so that the second motor 520 can rotate without being rotated by its own weight.
Further, it is preferable that the speaker driving device 500 is balanced so that the rotation shaft 521 is located at the center of gravity in the rotation direction.

  Accordingly, when the motor 520 is rotated in the direction of arrow E in the figure by the instruction of the motor drive control circuit (MCU, see FIG. 1), the second speaker fixing plate 505 is rotated, and the right channel speaker RSP is in the direction of arrow F (the first figure). 2 in the same rotational direction as the motor 520). Therefore, when the motor 520 rotates 180 degrees, the right channel speaker RSP also rotates 180 degrees, and the sound emission opening 115 faces in the direction opposite to the visual recognition direction in the figure.

Note that the image projection apparatus 100 and the DVD playback apparatus 200 are arranged to overlap each other, and the structural joining has been described above, but the electrical joining will be described with reference to FIG.
The housing 170 of the image projection apparatus 100 is provided with a through hole 172 and the fixed gear 222 of the DVD reproduction apparatus 200 is also provided with a through hole 227 so that the DVD reproduction apparatus 200 and the image projection apparatus 100 are penetrated. As shown also in FIG. 1, between the DVD reproduction apparatus 200 and the image projection apparatus 100, audio output terminals 212 and 213 and audio input terminals 101 and 102, and an image output terminal 211 and an image input terminal 131 are through holes, respectively. They are connected by lead wires (not shown) penetrating 172 and 227.
This lead wire has sufficient length and flexibility so that the image projection apparatus 100 may be rotated or tilted.
Although not shown, the speaker driving device 500 has a lightweight synthetic resin cover.

Next, switching of the sound output direction of the right channel speaker RSP and the left channel speaker LSP of the projector 1 will be described.
FIG. 8 is a schematic perspective view showing the movement of the sound output port of the right channel speaker of the first embodiment. Components other than the speaker are omitted for easy understanding of the movement of the speaker itself (see FIG. 7 for details). Since the left channel speaker is almost the same, the description is omitted. In FIG. 8A, the image projection device 100 is placed on the upper surface of the DVD playback device 200. The image projector 100 shows a state in which it is rotated 90 degrees clockwise from the initial direction (shown in FIG. 2) in the horizontal direction. At this time, the projection optical system 136 is 90 degrees to the right of the medium insertion outlet 210. That is, an image is projected forward on the left side with respect to the operator. Therefore, the sound output port 115 of the right channel speaker RSP is directed toward the rear side of the operator.

  At this time, if the rotary encoder 150 detects that the rotation angle is rotated 90 degrees clockwise, the MCU issues a command to rotate the motor 520 (see FIG. 7) to rotate 180 degrees, and the sound output port. 115 rotates 180 degrees in the direction of the arrow and faces the image projection direction (FIG. 8B).

  Subsequently, an instruction is issued from the MCU to the motor 510 (see FIG. 7) so that the sound emission opening 115 faces the operator (in the direction of the medium insertion outlet 210), and the motor 510 rotates by the indicated amount to emit sound. The mouth 115 is directed to the operator (FIG. 8 (c)). Since the operator inserts and ejects a medium such as a disc from the medium insertion outlet 210, when the direction of the medium insertion outlet 210 is set as a reference direction, it is automatically close to the best when the image projection apparatus 100 is rotated. Voice direction is obtained.

  FIG. 8D is a schematic front view showing a state viewed from the medium insertion outlet 210 when the image projection apparatus 100 is tilted. In FIG. 8D, when the image projection apparatus 100 is tilted, in detail, the tilt angle is measured by the tilt sensor 400 as shown in FIG. 5, and the result is calculated by the MCU and processed by the motor. 520 is rotated in the direction of the arrow so that the right channel speaker RSP is substantially horizontal to the DVD device 200. That is, the level of the speaker can be maintained by changing the inclination angle of the speaker RSP in the opposite direction by the angle at which the image projection apparatus 100 is inclined.

  In the above-described first embodiment, the example in which the image projection apparatus 100 is rotated clockwise has been described. However, even when the image projection apparatus 100 is rotated counterclockwise, the rotary encoder 150 can detect the rotation direction and the rotation angle. The necessary rotation angle and rotation direction can be calculated and directed in the optimum direction.

Therefore, according to the first embodiment, the image projecting apparatus 100 and the DVD reproducing apparatus 200 that is an image / audio signal processing apparatus are vertically stacked to form a unit, and the image projecting apparatus 100 is combined with the DVD reproducing apparatus 200. On the other hand, it can be rotated in the horizontal direction and tilted in the vertical direction.
Therefore, when the image projection apparatus 100 is rotated in the horizontal direction, the angle at which the image projection apparatus 100 is rotated by the rotary encoder 150 is measured, and the sound emission ports 115 of the right channel speaker RSP and the left channel speaker LSP are used as the medium. Since it is directed in the direction of the insertion outlet 210, that is, in the direction of the operator, good sound can always be heard even if the room layout or the image projection direction changes.

Further, according to the first embodiment, the image projection apparatus 100 has a structure in which the tilt angle can be changed in the vertical direction with respect to the DVD playback apparatus 200, that is, the tilt angle can be adjusted. The inclination angle is measured by the inclination sensor 400, and the sound emission direction of the right channel speaker and the left channel speaker can be switched in accordance with the result, so that the sound can be heard from the best direction for the viewer.
At this time, the directions of the left and right speakers described above are preferably horizontal with respect to the DVD playback device 200, but can be set appropriately by the viewer.
Further, the right channel speaker RSP and the left channel speaker LSP can be driven at the same angle or at different angles.

The second embodiment is a case where a stereo speaker is provided in a DVD playback apparatus 200 that is an image / audio signal processing apparatus, and the structure thereof will be described with reference to FIGS. Therefore, a different part from Example 1 is demonstrated, and the code | symbol in a figure is provided to the common part similarly.
FIG. 9 is a configuration diagram of the projector 1 according to the second embodiment. In FIG. 9, the image projection apparatus 100 includes an image processing system and a control system.

  The image processing system includes an illumination optical system 132 for outputting illumination light, a liquid crystal light valve 134 for forming image light, a projection optical system 136 for projecting image light onto the screen 300, and a DVD reproducing apparatus. An image input terminal 131 (Vin) for inputting an image signal from 200, an image processing unit 140 for processing the image signal, and a liquid crystal drive for driving the liquid crystal light valve 134 based on the processed image signal Circuit 142.

As described in the first embodiment, the image projection apparatus 100 can be rotated or inclined in the plane direction with respect to the DVD playback apparatus 200. At this time, a rotary encoder 150 for detecting (measuring) the rotation angle and an inclination sensor 400 for detecting (measuring) the inclination angle are provided, and these measurement results are taken in, and the amount of change from the initial position is calculated. Then, an MCU (microcomputer unit) that judges the result and switches and controls the analog switches 103 and 104 built in the DVD playback apparatus 200 is provided.
In addition, switch control output terminals 137 and 138 for outputting control signals from the MCU to the analog switches 103 and 104 to the DVD playback apparatus 200 are provided.

The DVD playback apparatus 200 is mainly composed of an image playback processing system that performs playback processing of an image / audio medium, and an audio playback processing system. Of these, the audio processing system reproduces and outputs the audio signal of the image / audio medium, analog switches 103 and 104 for switching the output destination of the audio signal, and amplifies the audio signal. Amplifiers 105, 106 and 107, 108, a right channel speaker RSP and a left channel speaker LSP of stereo speakers as built-in speakers, and audio output terminals Rout and Lout for outputting audio signals to the outside. .
In addition, an image signal output terminal 211 for outputting an image signal to the image projection apparatus 100 and switch control signal input terminals 214 and 215 for inputting a switch control signal from the MCU are provided. Further, a power supply terminal (not shown) for obtaining power from the image projection apparatus 100 is also provided. Note that an external image / audio input terminal may be added to the DVD playback apparatus 200 (the same applies to the first embodiment).

  FIG. 10 is a perspective view illustrating an outline of the projector 1 according to the second embodiment. In FIG. 10, the image projection device 100 is placed on the upper surface of the DVD playback device 200. As described in the first embodiment, the image projection device 100 and the DVD playback device 200 are concavo-convexly fitted at substantially the center of each, and can be rotated in the plane direction and tilted in the vertical direction (FIG. 3, FIG. 3). 5). A part of the projection optical system 136 protrudes from the housing 170.

Further, a side of the DVD playback apparatus 200 is provided with a medium insertion outlet 210 for inserting or ejecting an image / audio medium (disc) for DVD playback, a right channel speaker RSP on the right side of the medium insertion outlet 210 and a left side. The left channel speaker LSP is provided toward the inside of the housing 221.
In general, when operating the projector 1, since the disk is often inserted and ejected from the medium insertion outlet 210, the operator is often on the medium insertion outlet 210 side. The sound output direction of the speaker RSP and the left channel speaker LSP is the direction of the operator, that is, the direction of the medium insertion outlet 210, and the sound output 115 is provided in the housing 221.

As shown in FIG. 10, when the projection optical system 136 is on the side opposite to the medium insertion outlet 210 (reference position), the right channel audio signal is output to the right channel speaker RSP and the left channel audio is output to the left channel speaker LSP. A signal is being output.
Next, although not shown, when the image projection apparatus 100 is rotated in the horizontal direction and the projection optical system 136 is directed in the same direction as the medium insertion outlet 210, the operator can insert an image / audio medium (disc) or the like. After the operation, you will see the image projection direction. At this time, since the left channel audio signal is output from the right side of the operator and the right channel audio signal is output from the left side, in the case of stereo audio, audio that does not match the image is heard. Therefore, the analog switches 103 and 104 are switched to match the directions of the image and the stereo sound.

  When the projection optical system 136 is rotated in the direction of the medium insertion outlet 210 as described above, the rotation angle of the image projection apparatus 100 is detected by the rotary encoder 150, and the image projection total position 100 is rotated by 180 degrees. Judge that Then, the analog switches 103 and 104 are switched by the MCU in the direction indicated by the two-dot chain line in FIG. Thus, the right channel audio signal from the audio reproduction processing unit is output to the left channel speaker LSP, and the left channel audio signal is output to the right channel signal. The switching of the analog switches 103 and 104 is performed from a state in which the image projection apparatus 100 is rotated by 90 degrees or more, but it is performed in a state in which the image projection apparatus 100 is rotated by approximately 120 degrees (both clockwise and counterclockwise). Discomfort with the projected image is reduced. However, the setting of this angle can be arbitrarily selected.

  Further, even when the image projection apparatus 100 is tilted, the rotation angle of the image projection apparatus 100 can be measured by the rotary encoder 150 as described in the first embodiment (see FIG. 5). The signal can be switched.

  Therefore, according to the second embodiment, when the image projection apparatus is rotated 90 degrees or more in the plane direction, the operator faces the image projection direction, so the right channel speaker RSP is directed to the left side of the operator and the left channel. The speaker LSP is moved in the right direction. At this time, the rotary encoder 150 detects the rotation angle of the image projection apparatus 100, and the audio signal switching unit switches the output of the right channel audio signal to the left channel speaker and the left channel audio signal to the right channel speaker. Since sound matching the image is output, sound with a sense of presence can be obtained.

Next, Embodiment 3 of the present invention will be described with reference to FIG.
FIG. 11A is a plan view of a main part of a DVD apparatus 200 according to the third embodiment of the present invention, and the image projection apparatus 100 is omitted. FIG.11 (b) is principal part sectional drawing which shows the XX cross section of Fig.11 (a). In FIG. 11, a medium insertion outlet 210 is provided on the side surface of the housing 221 of the DVD playback apparatus 200, and a right channel speaker RSP is provided inside the side surface in the perpendicular direction. Although the left channel speaker LSP is provided at the opposite position, it is omitted because it has the same structure as the right channel speaker RSP. A plurality of sound emission holes 231 are formed in the speaker RSP sound emission part of the housing 221, and a recess 232 in a range that can accommodate a sound reflector 250 described later is formed.
In addition, a two-stage convex portion 232 is formed on the lid portion of the housing 221 toward the inside of the housing, and a female screw is screwed at the center. A support plate 260 to which the sound reflecting plate 250 is attached is attached to the convex portion 232.

  The support plate 260 has a substantially rectangular shape, and through holes are formed at both ends in the longitudinal direction. The support plate 260 is inserted into a slit 233 provided in the housing 221, and the support plate 260 and the sound reflection plate 250 are screwed and fixed to the outside of the housing 221 with screws 270. In this manner, it is brought into contact with the end surface of the convex portion 232 of the housing 221 and is screwed and fixed by a screw 271.

The sound reflector 250 has a substantially rectangular shape and is set to a size that covers the sound emission part of the speaker RSP. A female screw is screwed at a substantially central portion in the long side direction of the sound reflecting plate 250, and a screw 270 is screwed to the female screw to be fixed to the support plate 260.
A leaf spring 280 is sandwiched between the sound reflector 250 and the support plate 260, and even if screwed, the elastic force of the leaf spring 280 is fixed so as to be able to turn left and right with a constant frictional force. ing.

A leaf spring 280 is also sandwiched between the support plate 260 and the convex portion 232 of the housing, and even if screwed by a screw 271, the elastic force of the leaf spring 280 allows left and right rotation with a constant frictional force. It is fixed as possible.
Therefore, the support plate 260 to which the sound reflecting plate 250 is attached is freely rotatable about the screw 271 of the convex portion 232 (indicated by a two-dot chain line in FIG. 11A), and the sound reflecting plate 250. Also, the screw 270 is freely rotatable about the axis.

Next, the operation of the audio reflector 250 will be described.
First, when the image projection apparatus 100 is rotated in the same manner as in the first and second embodiments, the rotation angle is detected by the rotary encoder 150, and the analog switches 103 and 104 are switched based on the detected result, and the right channel audio signal is sent to the left channel speaker. The left channel audio signal is output to the LSP to the right channel speaker RSP.

There are various places for viewers when projecting images. Therefore, first, when the support plate 260 is moved in the direction B in the figure, the sound output from the speaker RSP is reflected by the sound reflecting plate 250 toward the medium insertion outlet 210.
When the support plate 260 is moved in the F direction, the sound output from the speaker RSP is reflected by the sound reflecting plate 250 in the direction opposite to the medium insertion outlet 210, that is, in the direction of the projection optical system 136.
At this time, the side near the right channel speaker RSP of the audio reflector 250 is located at the end of the speaker RSP near the projection optical system 136 when moved in the B direction, and is moved in the F direction. Is positioned closer to the medium insertion outlet 210 of the speaker RSP.

  Furthermore, since the audio reflector 250 alone can be rotated in the direction of arrow C around the screw 270 as the rotation axis, the audio reflector 250 can be moved to an arbitrary position.

  Further, when the projector is housed, the support plate 260 is moved in the D direction so that the sound reflecting plate 250 is housed within the range of the recess 232 of the housing 221 so that it does not protrude from the outer shape of the housing 221. Yes.

Therefore, according to the third embodiment, the sound reflecting plate 250 that reflects the sound from the above-described speakers is provided in the vicinity of the sound emitting portions of the left and right speakers RSP and LSP, and the image projecting device 100 is moved in the horizontal direction. When the sound reflector 250 is rotated in the direction that the sound is reflected in the direction in which the sound is reflected toward the viewer, the sound can be heard from the best direction for the viewer.
Even when the image projection apparatus 100 is not rotated (reference position), the sound is heard from the best direction by arbitrarily selecting and moving the position and direction of the sound reflector 250 according to the position of the viewer. be able to.

The present invention is not limited to the above-described first to third embodiments, and modifications, improvements, and the like within a range in which the object of the present invention can be achieved are included in the present invention.
For example, in the first embodiment, the rotary encoder 150 and the tilt sensor 400 are incorporated in the image projection apparatus 100 as the angle detection apparatus. However, the angle detection unit is configured separately from the image projection apparatus 100 and mounted. Also good.
In the first embodiment, the stereo speakers RSP and LSP are driven by the speaker driving device 500. However, the stereo speakers RSP and LSP can also be manually driven after being driven by the speaker driving device 500 and manually. Further, it can be adjusted in the optimum direction.

  In the second embodiment described above, the output destination of the right channel audio signal and the left channel signal is switched based on the detection result of the rotary encoder 150. However, the positions of the image projection device 100 and the viewer have an unexpected relationship. Therefore, it is more preferable to prepare a separate audio signal output switch.

  In the above-described third embodiment, the stereo speakers RSP and LSP are built in the side surfaces on both sides of the medium insertion outlet 210, but the positions of the speakers are the same as the positions of the second embodiment and the medium insertion outlet 210. There are various things such as the opposite side. Therefore, the audio reflector 250 can be provided regardless of the position of the speaker.

  Therefore, the projector 1 of the present invention is unitized so that the image projection device and the image / audio signal processing device are movable, detects the relative angle between the image projection device and the image / audio signal processing device, and outputs the audio output to the right. By selectively switching to the channel speaker and the left channel speaker and switching the sound emitting direction to the direction toward the viewer, a projector capable of obtaining the best sound can be provided.

1 is a configuration diagram of a projector according to a first embodiment of the invention. FIG. 1 is a perspective view of a projector according to a first embodiment of the invention. 1 is a cross-sectional view of a projector according to a first embodiment of the invention. 1 is a perspective view of a rotary encoder according to Embodiment 1 of the present invention. 1 is a cross-sectional view of a projector according to a first embodiment of the invention. Sectional drawing which shows the structure principle of the inclination sensor concerning Example 1 of this invention. Sectional drawing of the speaker drive device concerning Example 1 of this invention. 1 is a perspective view of a main part of a projector according to a first embodiment of the invention. FIG. 6 is a configuration diagram of a projector according to a second embodiment of the invention. FIG. 6 is a perspective view of a projector according to a second embodiment of the invention. FIG. 9 is a plan view of a main part of a projector according to a third embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 100 Image projection apparatus 150 Rotary encoder 200 DVD reproduction apparatus 400 Inclination sensor 500 Speaker drive apparatus RSP Right channel speaker LSP Left channel speaker

Claims (6)

A projector in which an image projection device and an image / audio signal processing device are movably unitized,
A right channel speaker and a left channel speaker provided in the image projection device;
An angle detection device for detecting a relative angle between the image projection device and the image / audio signal processing device;
A speaker driving device that changes a sound emission direction of the right channel speaker and the left channel speaker based on a detection result of the angle detection device;
A projector comprising: The projector according to claim 1, wherein
The image projection device is provided so as to be rotatable in a horizontal direction with respect to the image / audio signal processing device;
A projector comprising: a speaker driving device configured to change a sound emitting direction of the right channel speaker and the left channel speaker based on a detection result in a planar direction of the angle detection device. The projector according to claim 1, wherein
The image projection device is provided to be tiltable in a vertical direction with respect to the image / audio signal processing device;
A projector comprising: a speaker driving device that changes a sound emitting direction of the right channel speaker and the left channel speaker based on a detection result of an inclination angle of the angle detection device. The projector according to any one of claims 1 to 3,
Based on the detection result of the angle detection device, the sound emission direction of the right channel speaker and the left channel speaker is directed to the direction of the image / audio medium insertion outlet provided in the image / audio signal processing device. Projector. A projector in which an image projection device and an image / audio signal processing device are movably unitized,
A right channel speaker and a left channel speaker provided in the image / audio signal processing device;
An angle detection device for detecting a relative angle between the image projection device and the image / audio signal processing device;
An audio signal that is selectively switched between the right channel speaker and the left channel speaker and output from the right channel speaker and the left channel speaker based on the detection result of the angle detector. A switching unit;
A projector comprising: The projector according to claim 5, wherein
A projector characterized in that an audio reflector that reflects the audio output from the right channel speaker and the left channel speaker is provided on the external side surface of the image / audio signal processing device so as to be movable and rotatable. .

Images