JPS6130167A - Overhead projector printer - Google Patents

Abstract

PURPOSE:To obtain a small-sized and portable overhead projector capable of photographing and printing by sliding a line sensor to receive the light on a screen which is irradiated in a bright line from an illuminating device through a photographic device and photographing an image. CONSTITUTION:In the projection mode, an original picture is placed on a Fresnel condenser mirror 40 and is projected onto a screen like a white plate through a projection lens 21. In the photographic mode, a linear condenser lens 33 is placed on the optical axis, and the light discharged from the lens 33 is converged into a bright line. In this state, a line sensor 12 is slid to receive the light from the screen which is made incident through a photographic lens 11, and it is photographed. In the mixture mode, the original picture on the mirror 40 is projected on the screen by the projcetion mode, and another desired original picture is written over said projected picture, and the mode is switched to the photographic mode to photograph them. In the copy mode, an original picture written on an ordinary paper is placed on the mirror 40, and the optical axis of an image pickup system is set vertically, and the original picture is photographed directly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an overherad projector (hereinafter referred to as an overherad projector blink) having a function of photographing and printing an original image on a screen.

(Prior art) Overherad projectors, which have traditionally been used for conferences and briefing sessions, are known by placing a light-transmitting lamp on which characters, figures, etc. are written, on a condenser mirror, and projecting light onto it. The light reflected by the light source mirror is projected onto a screen via a projection lens.

(Problems to be Solved by the Invention) However, such a conventional over-the-top projector only has a projection function, so there is a problem that its use is extremely limited.

Therefore, an object of the present invention is to solve the above-mentioned problems and provide a new overhead projector (overhead projector/printer) that has not only a projection function but also a function of photographing and printing original images on a screen. An object of the present invention is to provide a small and portable overhead projector by effectively illuminating a screen using a normal overhead rad projector.

(Means for Solving the Problems) Technical means according to the present invention for solving the above problems include an illumination means, a projection means, a photographic lens, and a lens that is slidable with respect to light incident thereon. An overhead projector/printer comprising: a one-dimensional line sensor constituted by a photoelectric conversion element; and a photographing means having a one-dimensional line sensor, the illumination means being provided with a means capable of emitting bright line-like irradiation, The possible means and the one-dimensional line sensor are linked, and the one-dimensional line sensor photographs a screen illuminated in the form of a bright line from the illumination means via the projection means.

(Operation) The above technical means operates as follows. The one-dimensional line sensor and the means capable of emitting bright line-like irradiation work together, and the one-dimensional line sensor photographs the screen that is illuminated in the form of a bright line from the illumination means via the projection means, so that the illumination at the time of photographing is can be done effectively.

(Example) Hereinafter, the present invention will be described in detail based on an example with reference to the drawings.

FIG. 1 is a side view showing an embodiment of an overhead projector printer according to the present invention, in which the main components of the optical system are shown transparently.

In the figure, reference numeral 10 denotes a photographing system, which includes a photographing lens 11 and a line sensor 12 movable in a direction perpendicular to the drawing.

The line sensor 12 is composed of a one-dimensional solid-state image sensor (for example, C0D) in which many pixels are arranged in a line. FIG. 2 is a detailed view of the imaging system 10, and FIG. 2 (5) is a side view of the internal structure, and FIG. 2 (Bl is a rear view).

Both ends of the carrier 14 supporting the line sensor 12 are provided so as to be slidable in the direction indicated by an arrow 16 within a sliding rail 15 as shown. That is, photographing is performed by scanning the light from the photographing lens 11 in the direction of the arrow 16. It is preferable that the line sensor 12 be slid using a pulse motor or a stepping motor (not shown).

Moreover, this sliding movement is linked to the rotation of the linear condenser lens 330 between the illumination threads, as will be described later.

Reference numeral 20 denotes a projection system, which is fixed at the bottom of the imaging system io.

The projection system 20 includes a projection lens 21, an objective mirror 22, and a focus adjustment knob 23. The projection lens 21 is interlocked with the photographing lens 11 via a gear U. That is, by moving the focus adjustment knob n, the projection lens 21 moves in the optical axis direction, and at the same time, the photographing lens 11 also moves in the same optical axis direction. Therefore, by focusing the projection lens 21, the photographing lens 11 is also focused at the same time. In other words, focusing of these lenses is performed in the same way as in a twin-lens reflex camera.

A lighting system is installed at the rear of the photographing system 10 and the projection system 20. The illumination system consists of a light source 31 composed of a logen lamp or the like, a light source mirror support, and a linear condenser lens field. The linear condenser lens is composed of a so-called semicylindrical lens, as shown in FIG.

This linear condenser lens is movable in the direction shown by arrow M, and rotatable in the direction shown by arrow A on the optical axis of the light reflected by the light source mirror 32.

Movement in the direction of arrow M can be easily performed by manually moving the linear condenser lens O, and rotation in the direction of arrow A can be easily performed using a pulse motor or a stepping motor. As is well known, a kamaboko plastic lens can focus incident light into an emission line. Therefore, when the linear condenser lens is at the position indicated by the solid line in the figure, the light reflected by the light source mirror 32 is focused in the form of a bright line, and the amount of light on the Fresnel condenser mirror 40 is shaped as shown by the reference numeral A. become. Similarly, the linear condenser lens 33 is 33. in the figure. ．． When the light source mirror 32 is at the position 332, the light reflected by the light source mirror 32 is at the position 36. ．． 3
It focuses in the form of an emission line at position 62. That is, by rotating the linear condenser lens 33, the bright line illumination moves in the direction of the arrow. Note that, as described later, these bright line-shaped lights are used as light for illuminating the screen during photographing, and this point is the most distinctive feature of the present invention. On the other hand, when the linear condenser lens 33 moves in the direction of the arrow M and is not on the optical path of the reflected light from the light source mirror 32, the reflected light is uniformly distributed at the top of the original Fresnel condenser mirror as shown by the reference number. irradiate. This light is used as a light source during projection. Incidentally, as the linear condenser lens 33, a semicylindrical lens whose surface has been processed to have a Fresnel pattern may be used.

The Fresnel condenser mirror is used in conventional over-the-edge projectors, and is rotatably provided on the upper surface of the case 50.

The case cabinet mainly houses the printing system, control system, and power supply system. FIG. 4 is a block diagram showing these structures.

The printing system mainly consists of a print control circuit ω, a roll 61, and a recording paper 6.
2. It is composed of a thermal transfer printer (used in facsimiles, etc.) having a paper feed motor 63, a platen roller, a thermal head 65, and a roller 66. As the recording paper 62, both plain paper and transparent film are used. These recording papers are wound around each roll 61.

The control system mainly includes a control circuit 70 that controls each part, a memory 71 that stores various information, and a linear Fresnel lens 3.
3 and a motor n and 74 for driving the line sensor 12
It has a motor drive circuit 72 for supplying electrical signals to the line sensor 12, and a light receiving element peripheral circuit 75 for processing electrical signals from the line sensor 12. The power supply system consists of a power supply circuit that converts 100 volts of AC into direct current, and a buffer battery 81.

The beauty is the operation section, where various information is entered via the keyboard.

The photographing system 10, the projection system and the illumination system 30 are connected to the pole 10.
0 and can be housed in a case 50.

Next, the operation will be explained. The basic operations of the overhead projector/printer according to the present invention include a projection mode, a photographing mode, a mixing mode, a replay mode, and a copy mode. Each mode will be explained in detail below.

(5) Projection mode In the projection mode, the original image is placed on the Fresnel condenser mirror 40 and projected onto a white plate-like screen (not shown) via the projection lens 21, and is a normal operation of an overhead projector. is the same as however,
In the projection mode, the linear condenser lens of the illumination system 30 is not located on the optical axis of the light reflected by the light source mirror 32. This is to uniformly illuminate the Fresnel condenser mirror 40, as explained using FIG.

(B) Photographing mode First, the linear condenser lens 33 is placed on the optical axis, and the light emitted from the linear condenser lens is focused into a bright line. In this state, light from the screen that enters through the photographic lens 11 is received by sliding the line sensor 12 as described above. That is, the screen is photographed by scanning it line by line. This light is focused into an emission line by the linear condenser lens, and the Fresnel condenser mirror 40
(no original image is placed here), reflected by
Through the projection system, a thin beam is irradiated onto the screen currently being scanned by the imaging system. The bright line irradiation position on the screen is controlled by rotating the linear condenser lens as described above. Therefore, the movement of the line sensor 12 and the movement of the linear condenser lens must be synchronized to enable the above-described operation.

This synchronization is easily accomplished by performing desired calculations in the control circuit 70 of FIG. The calculation results are given to the motor drive circuit 72 and converted into electrical signals for driving the motors 6 and 74, respectively, and the line sensor 12
and the linear Fresnel lens 33 are controlled as described above.

By photographing as described above, the light received by the line sensor 12 is converted into an electrical signal, which is then converted into an electrical signal used for printing by the light receiving element peripheral circuit 75, the control circuit 70, and the printing control circuit ω. The image is printed on the recording paper 62 via the thermal head 65.

Focusing during photography is achieved by projecting a dummy image placed on a boiled Fresnel condenser mirror onto a screen, and adjusting the projection lens 21 via the focus adjustment switch 7 so that the image is in focus on the screen. Let's do it. As a result, the focus of the photographic lens 11 will automatically match the screen.

(C) Mixed mode In the mixed mode, the original image on the Fresnel condenser mirror is projected onto the screen using the projection mode, the desired original image is written on the screen in the form of an overlay, and then the mode is switched to the shooting mode. It is something to photograph. As a result, the printed information is a superimposed image of the original image on the Fresnel condenser mirror 40 and the original image written on the screen.

(D) Replay Mode In the replay mode, printing is performed on transparent film in the shooting mode or mixed mode. This is reprojected in projection mode.

(B) Copy mode In the cohey mode, place the original image written on plain paper on top of the Fresnel condenser mirror, rotate the optical axis of the photographing system in the direction shown by arrow 110 in Fig. 1, and stand it vertically. This original image is directly photographed.

At this time, since the distance between the photographing lens 21 and the original image is short, the illumination for photographing does not need to be in the form of a bright line.

The above description has been based on one embodiment of this invention.

In the above embodiment, polarizing filters may be inserted into the projection system and the photographing system in order to reduce the effects of glare on the screen. In addition, the optical axis of overhead projectors and printers is located below the screen,
If the distortion of the image is large as a result, it can be eliminated by using aspheric lenses and mirrors, or by using long focal length lenses for each lens and ensuring a sufficient distance from the screen. Furthermore, the electrical signal from the line sensor can be displayed on a display or printed by supplying it to an external converter.

(Effects of the Invention) As described above, according to the present invention, it is possible to provide a new overhead projector in which photographing and printing functions are added to a conventional overhead projector. In particular, since the light source of the overhead projector can be effectively used for illuminating the image on the screen during photographing, the apparatus can be made smaller and can be made into a portable device.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Figs. 2 (5) and (B) are detailed block diagrams of the photographing system, and Fig. 3 is a diagram for explaining the operation of the illumination system. FIG. 4 is a block diagram of the printing system, control system, and power supply system. 10...Photography system, 11...Photography lens, 1
2... Line sensor, Nod... Projection system, 21...
Projection lens, 22... Objective mirror, n... Focus adjustment knob, U... Gear, 30... Illumination system,
31... Light source, 32... Light source mirror, 33
・・・Linear condenser lens, Black...Fresnel condenser mirror, Beautiful...Case, Beautiful...Operation unit,
lOO... Paul. Patent Applicant Oki Electric Industry Co., Ltd. Patent Application Agent Patent Attorney Megumi Yamamoto
tB) 10; Exposure system 11: Questions 11 12 Ni Linear cenoma “Ma)゛14 Nioh giant body 1, etc.: Motion rail calculation, Figure 3

Claims (1)

[Claims] 1 consisting of an illumination means, a projection means, a photographing lens, and a photoelectric conversion element that can slide against light incident through the lens;
An overhead projector/printer comprising: a photographing means having a one-dimensional line sensor; An overhead projector characterized in that the one-dimensional line sensor works in conjunction with a line sensor and photographs a screen illuminated in the form of bright lines from the illumination means via the projection means.
printer.