JPH04152330A - Projector - Google Patents

Abstract

PURPOSE:To enlarge and project the arbitrary part of an original on a screen and to easily read a character and a sign by moving an original platen, placing an enlarged part on an optical path, and further, moving the original platen in the direction of a light source and a projecting lens in the direction of the original platen. CONSTITUTION:Light from the light source 42 is reflected by a mirror 45, to transmit a Fresnel lens 110, the original platen 44, and an OHP sheet 46, converged by a lens 47, and reflected by a mirror 38 to be projected on the screen 36. When a part of the original is enlarged/displayed, the original platen 44 is moved downward, to shorten the length of the optical path with respect to the light source 42, and the lens 47 is moved downward, to shorten the length of the optical path with respect to the original platen 44. After that, the original platen 44 is moved back and forth and left and right. and the region to be enlarged of the original is placed on the center of the optical path. Thus, the arbitrary part of the original can be enlarged/projected on the screen, and the character and sign can be easily read.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overhead projector (OHP) projector for projecting a sheet or a slide.

[Prior Art] Conventionally, in a numerically known projector,
As shown in FIG. 6, there is an OHP on the projector body 20.
A sheet 21 is placed, and the image of the OHP sheet 21 is reflected by a lens 23 and a reflecting mirror 24 using light from a light source 22, and then projected from the front onto a screen 25 installed apart from the main body.

[Problems to be Solved by the Invention] However, in the conventional projector as described above, the projected characters, symbols, etc. are sometimes small and difficult to read.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a projector that can enlarge and project any part of a document on a screen.

[Means for Solving the Problem] In order to achieve this object, the projector of the present invention includes a document table moving means for moving a document table in a three-dimensional direction, and a projection device for moving a projection lens in a direction perpendicular to the document surface. An enlarged projection means consisting of a lens moving means is provided.

[Operation] In the projector of the present invention having the above configuration, the document table is moved by the document table moving means to bring the portion to be enlarged onto the optical path from the light source. Furthermore, by moving the document table toward the light source and the projection lens toward the document table using the document table moving means and the projection lens moving means, any part of the document can be enlarged.

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

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

A translucent screen 36 is attached within the front frame of the panel frame 34 vertically supported by the legs 32 and is writable with a felt-tip pen 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 that can read the image projected on the screen 36 and the characters written on the screen 36 is provided along the screen 36. It has a structure that can be scanned in any direction.

On the other hand, a projector lens 47 is provided below the image reflection mirror 38, and an OHP
A light-transmissive document table 44 on which a sheet 46 is placed is arranged. The lens 47 can be moved in the GH force direction by a roller D203, and the document table 44 is moved in three-dimensional directions by a document table moving device 210.

In the document table moving device 210, as shown in FIG. 5, the document table 44 is moved by rollers A to move the document table frame A in the ab direction, by rollers B to move the document table frame B to the cd direction, and by rollers C to move the document table frame C. It is possible to move in three-dimensional directions by moving in each of the ef force directions. Below the document table 44 is a Fresnel lens 110, and further below that is a mirror 45 that reflects the light emitted from the Bronekta light source 42 at right angles toward the document table 44, and is mounted so as to be rotatable in the directions of arrows E and F. It is being 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 is configured to scan and expose an OHP sheet 46, which is a copy original placed on the document table 44, a reflection plate 83 rotatably mounted on the document table 44, and an OHP sheet 46 placed on the document table 44. , 8, an exposure unit 5 consisting of a copying light source 48 movable in both directions and a plurality of folding mirrors 49.
0, an exposure unit consisting of a fixed folding mirror 51, and an LE that exposes the image read by the scanner 40.
It has two exposure methods: D52 and D52.

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,
Microcapsules containing a photocurable resin that hardens when exposed to light of green and blue wavelengths and cyan, magenta, and yellow dye precursors are coated on a base sheet. 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 developer sheet 60; It is comprised of a pressure roller 73 that applies a predetermined pressure to a heat roller 71 so that the colorant sheet 60 and the endless belt 74 are brought into close contact with each other.

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 explained with reference to FIG.

The electronic control circuit includes a central processing unit 92 that processes various calculations.
(hereinafter referred to as CPU) and a read-only memory 93 (hereinafter referred to as CPU) in which data used for calculations and control is stored in advance.
(hereinafter referred to as ROM) and a random access memory 90 (hereinafter referred to as R
AM), scanner 40 and panel switch 10
1 to the human power interface 94 and LE.
The output interface 95 outputs a signal to the D control circuit 102.

Next, the effect will be explained.

When used as a projector, as shown in FIG. 1, the image reflecting mirror 38 is first rotated in the direction of the arrow to raise it and pulled out to a position where it is fixed with a 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 moves as shown by arrow F.
The reflecting plate 83 is set at a predetermined position in the direction of the arrow, and the reflecting plate 83 is retracted in the direction of the arrow. Then, the light emitted from the projector light source 42 is reflected by the mirror 45 and is reflected by the Fresnel lens 110. The light passes through the document table 44 and the OHP sheet 46, is focused by the lens 47, is reflected again by the image reflection mirror 38, and is projected onto the screen 36.

When a part of the original on the original platen 44 is enlarged and displayed on the screen 36, it is performed as shown below.

First, the document table 44 is moved in the f direction by the roller C202 to shorten the optical path length with the projector light source 42, and the lens 47 is moved in the h direction by the roller D203.
Shorten the optical path length with 4.

After this, roller A200 moves the ab force direction, roller B2
By moving the document table 44 in the CD force direction according to 01, the area to be enlarged on the document is brought to the center of the optical path from the projector light source 42. If the original is projected in this state, the area on the original to be enlarged can be enlarged and displayed on the screen 36.

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 rotated in the direction of the arrow, and the OHP sheet 46 is
, and remove the Fresnel lens 110. When a copy start button (not shown) is pressed, the copy light source 48 lights up as shown in FIG. 2, and the exposure unit 50
scans and exposes in the B direction. OHP sheet 46 which is the manuscript
The reflected light is reflected by the folding mirrors 49 and 51 and exposes the 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 direction of arrow A 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 sent out from the cassette 61 by a suction cup 62, and is conveyed to a position where the leading edge of the developer sheet 60 corresponds to the leading edge of the latent image on the photosensitive recording medium 53, and then stopped.

Next, the pressure developing device 5 is driven by a well-known drive device (not shown).
The pressure roller 57 of No. 6 is pressed while being rotated in the direction of the arrow. 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 channel 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 input via 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 exposes the photosensitive recording medium 53 according to the transmitted data to form a monochrome latent image.

If you want to output in full color, scan through red, green, and blue filters and store the data corresponding to F, green, and blue on the RAM 90.
This is obtained by sequentially transmitting the information to the LED 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.

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

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

As is clear from the detailed description above, in the projector of this embodiment, any part of the original can be projected onto the screen 3.
6, the projected characters, symbols, etc. can be easily read.

Note that the present invention is not limited to the embodiments described in detail above, and changes can be made without departing from the spirit thereof.

For example, instead of rollers, gears may be used as the document table moving means.

[Effects of the Invention] As is clear from the above detailed description, the projector of the present invention can enlarge and project any part of the document on the screen, so that the projected characters,
Symbols etc. are easy to read.

[Brief explanation of drawings]

1 to 6 show embodiments embodying the present invention. 3 and 4 are perspective views seen from the front and rear surfaces, FIG. 5 is an enlarged perspective view of the document table moving device, and FIG. 6 is an electrical block diagram of the projector of this embodiment. Further, FIG. 7 is a perspective view of a conventional OHP. In the figure, 36 is a screen, 42 is a projector light source, 4
4 is a document table, 47 is a projection lens, 200 is a roller D, 2
10 is a document table moving device.

Claims (1)

[Claims] 1. In a projector that transmits light from a light source through a document on a document table, magnifies the transmitted light with a projection lens, and projects it onto a screen, the document table is moved in a three-dimensional direction. What is claimed is: 1. A projector comprising: an enlarged projection means comprising a document table moving means; and a projection lens moving means for moving the projection lens in a direction perpendicular to the surface of the document.