JPH04110839A - Projector - Google Patents

Abstract

PURPOSE:To obtain the projector which is usable in a light place and enables its screen to be moved while an image is projected by providing a writable screen and a projection means which projects an image on the screen from the back. CONSTITUTION:The translucent screen 36 which is writable with a felt pen, etc., is fitted in the front frame of a panel frame 34 and an image reflecting mirror 38 is fitted on the reverse surface rotatably above the panel frame 34. A scanner 40 which reads the image projected on the screen 36 and characters written there is provided to scan the screen as shown by arrows G and H. Consequently, the screen can be changed in angle and moved to another place, and a copy of an OHP sheet and a copy which has blackboard characters added to the OHP sheet are taken in the current site and distributed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an overhead projector sheet (
The present invention relates to a projector capable of projecting OHP sheets (hereinafter referred to as OHP sheets) and slides.

[Prior Art] In a conventionally known projector, as shown in FIG.
After being reflected by a reflecting mirror 24 through a lens 23, the image is projected from the front side onto a screen 25 installed apart from the main body.

In addition, with conventional copy blackboards, as shown in Figure 6, when characters or figures are written on the writing medium surface stretched in the form of a screen using a writing instrument such as a felt pen, and then the writing is to be copied. When a predetermined copy button (not shown) is pressed, the writing medium 1 is wound around the roller 3 by the driving force of the motor 2. At this time, the light source 4 is turned on and its light is irradiated onto the writing medium surface, and the irradiated light is received by the photoelectric conversion element 6 via the optical system 5. The image information detected by the photoelectric conversion element 6 is stored in the image memory device 9 via the element peripheral circuit 7 and the control circuit 8, while the image information detected by the photoelectric conversion element 6 is stored in the image memory device 9 via the print control circuit 10.
1, and is sent to the platen roller 12 by the rad 11 for printing.
It is recorded on the upper recording paper 13. Also, when you want to make multiple copies of the same content, you can specify the number of copies when you first operate the switch button, and the image information stored in the image memory device 9 can be transferred to the print via the control circuit 8. 11, and the required number of sheets is printed on 13 sides of the recording paper.

[Problem to be solved by the invention] However, according to the above-mentioned conventional projector,
Both the projector body and the screen are required, and a large installation space is required. Also, the person in front of the projector was sometimes unable to see the screen clearly because the projector itself was in the way.

Furthermore, it has the disadvantage that it can only be used in bright places and that the screen can only be moved to another location while taking pictures.

In addition, according to the copy blackboard with the conventional configuration mentioned in ``2'', a CCD image sensor is generally used as the photoelectric conversion element, and the pixel information detected by this sensor is
It is simply output processed as a binary signal of white and black, and color output is not possible. In addition, when it comes to images with gradation, such as photographs, there is a drawback that even if the image is dithered, the image becomes rough.

The present invention has been developed in view of these conventional drawbacks.The purpose of the present invention is to reduce the installation space, allow everyone to see the screen clearly, and allow use in bright places. To provide a projector capable of moving the screen while displaying images.

Another object of the present invention is to provide a projector capable of copying the contents of a projected original as well as characters, figures, pictures, etc. added to a screen.

"Means for Solving the Problems" To achieve this object, a projector according to the present invention includes a screen, and a projection means that is provided integrally with the screen and projects onto the screen from the back side.

The screen also includes a light-transmissive writable screen, a projection device that projects light from a light source onto the screen from the back side through the document, a first exposure device that exposes the document to a photosensitive recording medium, and the screen. The image forming apparatus includes a reading means for reading the data, a second exposing means for exposing the photosensitive recording medium with the read data, and a developing and fixing means for developing the exposed photosensitive recording medium.

[Function] According to the projector of the present invention with such a configuration,
Characters, figures, etc. written on a transmissive original such as OHP paper are projected onto a screen by light from a light source.

Further, the photosensitive recording medium is exposed to light by another light source on the back side of the original document, and is developed by a developing and fixing means to obtain a copy thereof.

Furthermore, it is possible to write on the screen, and the characters, figures, and pictures added on the screen are read by an image scanner on the right side of the front, written on a photosensitive recording medium by a light source on the back, and then developed by a developing and fixing means. and you can get a copy of it.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 and 2 are perspective views of a projector according to an embodiment of the present invention seen from the front and back, and FIGS. 3 and 4 are schematic configuration diagrams seen from the side and back.

A writable, translucent screen 36 is attached to the front frame of the panel frame 34 vertically supported by the legs 32 using a felt ben or the like. On the back side of the screen 36, an image reflecting mirror 38 is rotatably attached to the upper part of the panel frame 34, and is fixed in an open position by a stay 39.

At one end of the front side of the panel frame 34, a scanner 40 is provided along the screen 36, which can read the image projected on the screen 36 and the characters written on the screen 36. , H
It has a structure that can be scanned in any direction.

On the other hand, a projector lens 47 is provided below the image reflecting mirror 38, and an OHP is further provided below the projector lens 47.
A light-transmissive document table 44 on which a sheet 46 is placed is arranged. Below it is a mirror 45 that reflects the light emitted from the flodictor light source 42 at right angles toward the document table 44.
It is attached so that it can rotate in the directions of arrows E and F. The projector light source 42 is disposed at a position bent at a right angle to the document table 44 by a mirror 45, and is always cooled by a fan 43 while the projector light source 42 is turned on.

The copy portion 100 includes a document table 44 , a Fresnel lens 110 movably mounted below the document table 44 , a reflector 83 movably mounted on the document table 44 , and a mirror plate 83 mounted on the document table 44 . An exposure unit 50 consisting of a copy light source 48 movable in both directions A and B to scan and expose an OHP sheet 46, which is a copied original, and a plurality of folding mirrors 49, and a folding mirror 5 fixed to the main body side.
1 and an LED 52 that exposes an image read by the scanner 40.

The photosensitive recording medium 53 used in this apparatus is, for example,
The main material is a photocurable resin using a well-known photopolymerization initiator as shown in Publication No. 2-143044, and it has red,
It is coated onto a microcapsule or base sheet containing a photocurable resin that hardens when exposed to light of green and blue wavelengths and cyan, magenta, and yellow dye precursors. The photosensitive recording medium 53 is housed in a cartridge 54 so as not to be exposed to light. The photosensitive recording medium 53 includes an exposure table 5 for exposing the photosensitive recording medium 53 from within the cartridge 54 to form a color latent image.
5, through a pressure developing device 56, a separation roller 58 for separating the pressure-developed photosensitive recording medium 53 and the color developer sheet 60, and is routed to a take-up roller 59. The pressure developing device 56 is comprised of a photosensitive recording medium 53 on which a latent image is formed by exposure, and a pair of pressure rollers 57 for overlapping a color developer sheet 60 and developing it under pressure.

The color developer sheet 60 is constructed by applying a color developer disclosed in, for example, JP-A-58-88739 onto a base paper, and is placed in the cassette 61 so that the developer coated surface faces upward. It is set.

At the top of the cassette 61, a suction cup 62 for feeding the developer sheets 60 one by one is arranged.

The heat fixing device 70 includes a heat roller 71 having a built-in heater 75, an endless belt 74 installed between the heat roller 71 and the roller 72, and used for coloring and glossing the color developer sheet 60, A pressure roller 73 applies a predetermined pressure to the heat roller 71 so that the color developer sheet 60 and the endless belt 74 are brought into close contact with each other.
It is composed of. A paper discharge tray 76 is attached to the outside of the heat fixing device 70.

Next, the configuration of a control circuit for exposing data read by the scanner 40 to the LED 52 will be described with reference to FIG.

The electronic control circuit 91 includes a central processing unit 92 (hereinafter referred to as CPU) that processes various calculations, and a read-only memory 93 that stores data used for calculations and control in advance.
(hereinafter referred to as ROM), a random access memory 90 (hereinafter referred to as R
AM), scanner 40 and panel switch 101
The input interface 94 receives input signals from the LED control circuit 102, and the output interface 95 outputs output signals to the LED control circuit 102.

The operation of the image recording apparatus configured as above will be explained.

When used as a projector, as shown in FIG. 3, the image reflecting mirror 38 is first rotated in the direction of the arrow to raise it and pulled out to the position where it is fixed with the stay 39.

Next, the OHP sheet 46 to be projected is placed on the document table 44, and the power switch is turned on. Then, the mirror 45 is set at a predetermined position in the direction of arrow F, and the reflecting plate 83 is retracted in the direction of the arrow. And the projector light source 42
The light emitted from the mirror 45 is reflected by the original platen 4.
4. The light passes through the OHP sheet 46, is focused by the lens 47, is reflected again by the image reflection mirror 38, and is reflected on the screen 3.
6.

When copying the OHP sheet 46 placed on the document table 44, the mirror 45 is rotated in the direction of arrow E, the reflector 83 is moved in the direction of the arrow, and the OHP sheet 46 is copied.
6 and move the Fresnel lens 110 in the N direction. When a copy start button (not shown) is pressed, the copy light source 48 is turned on and the exposure unit 50 scans and exposes in the B direction, as shown in FIG. The reflected light from the OHP sheet 46, which is an original, is reflected by a folding mirror 49 and a fixed folding mirror 51 to expose a photosensitive recording medium 53. In synchronization with the scanning of the exposure unit 50, the photosensitive recording medium 53 is moved in the same direction. When the exposure for one screen is completed, the exposure unit 50 moves back in the six directions of the arrow and returns to its original position. On the other hand, a latent image of a desired color image is recorded on the photosensitive recording medium after exposure.

The photosensitive recording medium 53 is conveyed by rollers 81 and 82 to the pressure roller 57 of the pressure developing device 56, and is stopped when the leading edge of the latent image reaches the pressure roller 57.

In synchronization with the movement of the photosensitive recording medium 53, the developer sheet 60 is fed out from the cassette 61 by a suction cup 62 until the tip of the developer sheet 60 corresponds to the tip of the latent image on the photosensitive recording medium 53. After being transported, it stops.

Next, the pressure roller 57 of the pressure developing device 56 is rotated in the direction of the arrow and pressed against the roller 57 by a well-known driving device (not shown). Then, the photosensitive recording medium 53 is sent while being pressed while being overlapped with the color developer sheet 60, and the uncured microcapsules on the photosensitive recording medium 53 are destroyed by the pressure, and the latent particles on the photosensitive recording medium 53 are destroyed. A color image corresponding to the image is developed on the developer sheet 60.

The color developer sheet 60 is separated from the photosensitive recording medium 53 by the separation roller 58 and guided toward the heat fixing device 70 .

In the heat fixing device 70, the color developer sheet 60 is pressed against the endless belt 74 by a heat roller 71 and a pressure roller 73, and is brought into close contact with the heater 75.
is heated to accelerate the development of color images. At the same time, the binder polymer (binder resin) for fixing the color developing medium to the base paper of the color developer sheet 60 is thermally melted, and the surface becomes smooth and the surface of the color developer sheet 60 has a moderate gloss. can get. The color developer sheet 60 that has been subjected to color development and gloss treatment is separated from the endless belt 74 by the curvature of the roller 72 and is discharged to a paper discharge tray 76 .

Further, when copying an image projected on the screen 36 or characters written on the screen 36, a scanner 40 provided on the right side of the front of the screen 36 is used.

If monochrome is acceptable, the screen 36 is scanned once in the direction of arrow G. The read data such as images and characters is temporarily stored on the RAM 90, which is taken in through the input interface 94 shown in FIG. The stored data is sent to the LED control circuit via output interface 95.

The LED 52 corresponds to red, green, and blue wavelengths, and the photosensitive recording medium 5 is connected according to the transmitted data.
3 to form a monochrome latent image.

If you want to output in full color, scan it through red, green, and blue filters, store the data corresponding to red, green, and blue on the RAM 90, and then
This is obtained by sequentially transmitting the data to the D control circuit.

If you want multiple copies, specify the number from the operation panel and you will receive copies for the specified number of schools.

Note that the light source for exposing the data read by the scanner 40 is not limited to an LED, but may be an LCD, a laser, or the like.

Furthermore, the image added on the screen 36 is immediately ○H.
It is also possible to copy it to a P sheet, create an OHP sheet on the spot, and project it on the screen 36.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention,
When used for presentations, it can be used in bright places, and the screen can be rotated or moved while the image remains on the screen.
The effect of presensation can be greatly improved, such as by being able to make and distribute copies of OHP sheets and copies of OHP sheets with added text on the blackboard on the spot.

[Brief explanation of the drawing]

1 and 2 are perspective views of a projector according to an embodiment of the present invention as seen from the side and the back, and FIGS. 3 and 4 are schematic views of the projector according to an embodiment of the present invention as seen from the side and the back. 5 is a block diagram showing the electrical block of a projector according to an embodiment of the present invention, FIG. 6 is a block diagram showing the schematic structure of a conventional copy blackboard, and FIG. 7 is a schematic diagram of a conventional OHP. It is a diagram. In the figure, 36 is a screen, 48 is a copy light source, 42 is a projector light source, 45 is a mirror, 44 is a document table, 46 is a lens, 38 is an image reflection mirror, 50 is an exposure unit, 40 is a scanner, and 52 is an LED. , 56 is a pressure developing device, and 70 is a heat fixing device.

Claims (1)

[Claims] 1. A projector comprising: a screen; and projection means that is provided integrally with the screen and projects onto the screen from the back side. 2. The projector according to claim 1, further comprising: a light-transmissive writable screen; a projection means for projecting light from a light source onto the screen from the back side through the document; A first exposure means for exposing the screen, a reading means for reading the screen, and a second exposure means for exposing the photosensitive recording medium to the read data.
an exposure means; a developing and fixing means for developing the exposed photosensitive recording medium;
A projector characterized by being provided with.