JPH04153635A - Projector - Google Patents

Abstract

PURPOSE:To point an arbitrary part on a picture projected on a screen without directly pointing the picture with a pointing stick by providing a display means displaying a sign such as an arrow on the picture projected on the screen. CONSTITUTION:When the arrow for an explanation is displayed on the picture projected on the screen 36, a signal sent from a remote control main body is received by a photodetector 103 provided on a panel frame 34, and transmitted to a CPU 92 via an input interface 94. The CPU 92 reads out the pattern of the arrow by a pattern generator inside a ROM 93, and outputs its output signal to an LCD control circuit 104. Therefore, the arrow for the explanation is displayed on an LCD 21, and projected on the screen 36, so that the arrow for the explanation is displayed on the picture. Thus, the sign such as the arrow pointing the arbitrary part on the picture projected on the screen 36 is displayed with a remote operation, without directly pointing the picture with the pointing stick.

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. At this time, the explainer had to use a pointer to explain the parts that he or she particularly wanted to emphasize using the projected image on the screen.

[Problem to be solved by the invention] However, according to the above-mentioned conventional projector,
It is difficult for the lecturer to explain while pointing at the screen projected on the screen with a pointer, and it also makes it difficult for the audience to see the screen because it is in the shadow of the speaker's body and hands. The effectiveness of the presentation was not improved due to the lack of content.

The present invention has been made in view of these conventional drawbacks, and its purpose is to
To provide a projector capable of displaying a symbol such as an arrow pointing to an arbitrary part of a screen projected on a screen without directly pointing to the screen with a pointer.

[Means for Solving the Problems] In order to achieve this object, a projector according to the present invention includes a screen, a projection means that is provided integrally with the screen and projects onto the screen from the back side, and the screen. and a display means for displaying symbols such as arrows on the screen projected on the screen.

Further, the display means is a liquid crystal panel disposed between the screen and the projection means.

[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, symbols such as arrows are displayed on the projected screen at the portion being explained.

[Embodiment] An embodiment of the present invention will be described below 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 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 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 reflection mirror 38, and an OHP
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 projector light source 42 at right angles toward the document table 44.
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.

Also, in front of the light source 42 is a liquid crystal display panel (hereinafter referred to as LCD) 21 for displaying arrows on the screen.
is located.

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 the 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 layer 60, and then to a take-up roller 59. The pressure developing device 56 includes a photosensitive recording medium 53 on which a latent image has been formed by exposure, and a pair of pressure rollers 57 for superimposing a color developer sheet 60 and developing the color developer sheet 60 under pressure. For example, the color developer disclosed in Japanese Patent Application Laid-Open No. 58-88739 is coated on a base paper, and the color developer is set in the cassette 61 so that the surface coated with the color developer faces upward.

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, a schematic configuration diagram of the remote control operation switch shown in FIG. 6 is shown. The remote control body 201 has a key 206a that displays an arrow.
, a key 206 for determining the direction in which the arrow is moved, and other keys are arranged.

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 in which data used for calculations and control and a pattern generator of symbols representing arrows are stored in advance. (Hereinafter referred to as RO
A random access memory 90 (hereinafter referred to as RAM) for temporarily recording the data of the calculated results, an input interface 94 that receives input signals from the scanner 4o, the panel switch 101, and the light receiving sensor 103, and an LED. Control circuit 102, LCD control circuit 10
4 and an output interface 95 that outputs an output signal.

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.

Here, a method for displaying explanatory arrows on a screen projected on a screen will be described.

In order to display an arrow, a signal is transmitted from the remote control main body 201 by pressing a key 206a provided at the center of the keys 206. A signal transmitted from the remote controller body 201 is received by the light receiving sensor 103 provided on the panel frame 34 and transmitted to the CPU 92 via the input interface 94. CPU92 is ROM93
The LCD control circuit 104 reads out the arrow pattern from the pattern generator inside and drives the LCD.
Output the output signal to. By this, LCD21
An explanatory arrow is displayed above and projected onto the screen, thereby displaying the explanatory arrow on the screen.

Next, to move this arrow, press the area around the key 206 in the direction you want to move it, and then
A signal indicating the direction is transmitted from 01. A signal transmitted from the remote controller body 201 is received by the light receiving sensor 103 provided on the panel frame 34 and transmitted to the CPU 92 via the input interface 94. The CPU 92 sequentially moves the LCD drive signal in that direction to drive the LCD.
It is output to the control circuit 104. By this, LCD21
Move the explanatory arrow onto the screen by moving the explanatory arrow up and projecting it onto the screen.

When copying the OHP sheet 46 placed on the document table 44, the mirror 45 is rotated in the direction of arrow E, the reflective plate 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 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 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 6o 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 developer medium to the base paper of the color developer sheet 60 is thermally melted, and the surface becomes smooth, giving the surface of the color developer sheet 60 a moderate gloss. can get. The color developer sheet 60 that has been subjected to the color development and gloss treatment is separated from the endless heald 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
It is obtained by sequentially transmitting the data to the D#J# circuit.

If you want multiple copies, you can specify the number from the operation panel and get the specified number of copies.

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

Furthermore, the image added on the screen 36 can be directly 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.

[Effects of the Invention] As is clear from the above detailed description, according to the present invention,
When used for presentations, it is possible to remotely display symbols such as arrows pointing to any part of the screen projected on the screen without having to point directly at the screen with a pointer, making it possible for people in the audience to It is possible to provide a projector in which the screen does not become invisible due to the shadow of the speaker's body or hands.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 are perspective views of a projector according to an embodiment of the present invention, seen from the side and the back, and FIGS. 3 and 4 are perspective views of a projector according to an embodiment of the present invention. 5 is a diagram showing an electrical block of a projector according to an embodiment of the present invention, and FIG. 6 is a schematic diagram of a remote control operation switch according to an embodiment of the present invention. 7 are schematic diagrams of a conventional OHP. 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, 4
0 is a scanner, 52 is an LED, 56 is a pressure developing device, 7
0 is a heat fixing device, 21 is a liquid crystal panel, 103 is a light receiving sensor, 201 is a remote control body, and 206 is a key for displaying an arrow. 1st Wi! 2! ! ! 3 Otsu■7Ba

Claims (1)

[Claims] 1. A screen, a projection means that is provided integrally with the screen and projects onto the screen from the back side, and a display means that displays symbols such as arrows on the screen projected onto the screen. A projector comprising: 2. A projector, wherein the display means is a liquid crystal panel disposed between the screen and the projection means.