JPS60160263A - Information display device - Google Patents

Abstract

PURPOSE:To eliminate the need for a page buffer memory storing a large capacity of information by adopting the raster scanning system for an information read means and a picture display means respectively and connecting them so as to keep synchronizing relation for both the systems. CONSTITUTION:A reader (Fig. A) applies raster scanning to video information of a film 1 and the video information is stored in a memory 10. The laster beam light modulated by a video signal from the memory 10 is scanned by a scanner 15 of a rotary polygon mirror of a display device (Fig. B) and exposed to the back side of a belt form picture display electrophotographic photosensitive body 20 via an f.theta lens 16 and mirror 17. The photosensitive body 20 is moved in the direction or arrow. A toner image formed by a developer 21 is fed to a display section 30 on which a transparent board is arranged, the photosensitive body 20 is stopped once at this position and the toner image is read. In this case, the signal synchronized with the recording/scanning of the display device is fed to the reader so as to synchronize the reading scanning. Thus, a small capacity storing the video signal for one several lines' share is enough for the memory 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information display device that displays image information recorded on a document such as a microfilm. Conventionally, information recorded on a microfilm is magnified through a lens system, Alternatively, it may be projected onto a transmissive screen and read visually.

However, with this method, although the light that passes through the image on the microfilm is optically magnified several tens to hundreds of times, the intensity is too high due to heat damage to the film or the lamp life. Due to reasons such as not being able to provide lighting,
The projected image on the screen is not very bright and does not have high contrast.Therefore, it is difficult to read information under bright environmental conditions.

Furthermore, since the light is magnified several tens to hundreds of times through a lens system, the space required for the optical path is relatively large, and generally a box-like shape is required, making it impossible to create a thin and compact display device.

On the other hand, with the progress of communication, some systems have come into practical use that raster scan information recorded on microfilm using a COD array sensor, convert it into sequential electrical signals, and transmit the information electronically to remote locations via transmission systems. It has been.

Furthermore, various image display devices that display information sequentially converted into electrical signals with high definition have been put into practical use.

These image optical display devices distribute recording energy such as heat, light, electric field, magnetic field, etc., which is controlled in accordance with video information converted into an electric signal, onto a display recording medium in a raster scan manner. 1 for recording used there! Depending on the type of magnetic wave energy and the type of recording medium that is visualized as an image, it is called by various names, such as electrophotographic type, magnetic stylus type, electrostatic type, thermal type image display device, etc.

In general, these display devices do not necessarily have fast display speeds, but they have in common that they display very easy-to-read images with high resolution.

An object of the present invention is to use a two-sister scanning method for each of the information reading means and the image display means, and to maintain a synchronized relationship between the two sister scanning methods.
The purpose of this combination is to provide a low-cost display device that eliminates the need for a page buffer memory or the like for storing large-capacity information of one frame or more.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of a microfilm reader that performs two-star scanning of video information recorded on microfilm and converts it into sequential electrical signals.

1 is a microfilm, which has the form of a roll film. Roll film usually has original marks (grips)
By detecting bx, bt, etc., a necessary frame can be automatically searched on the optical path.

Ml and M2 are motors for moving film 1,
Used to move film in forward and reverse directions. 2 is a light source for illumination, and 6 is a condenser lens. The light emitted from the light source 2 is collected by a condenser lens B and illuminates the film surface. 4 is an imaging lens, and 5 is a photoelectric conversion element that converts a film image into an electric signal (video signal). A one-dimensional line sensor is used as the photoelectric conversion element, and here a COD image sensor is used.

This is an A/D converter that converts the analog electrical signal output from the line sensor 5 into a digital signal. Reference numeral 7 denotes a control section, which is composed of a computer and controls the entire system.

Next, the operation of the above device will be explained.

A search for the film is started by a search command from the keyboard 8, and either motor M1 or M2 is driven to feed the film along the illumination position.

At this time, the line sensor 5 receives signals of the mark M, bg.Φ., and the control section 7 counts these signals. The retrieved film image is focused on the twin sensor 5 by the lens 4. The image is scanned in the main direction by the line sensor 5, and the image is sub-scanned by driving the motor M3 to move the twin sensor 5 in the film width direction, and the image for one frame is read and converted into a file signal. 10, and the video information for one line or several inches is stored in the memory 10. In the embodiment, an example of a roll film is shown, but not only a roll film but also a fish film, a document manuscript, etc. can be used.

FIG. 2 shows an example of a display device. In FIG. 2, a semiconductor laser (not shown) is modulated by a video signal sent from the memory 10, and the modulated laser beam is scanned in one direction (perpendicular to the plane of the paper) by a scanner 15 consisting of a rotating polygon mirror. The light is exposed to the back surface of a belt-shaped non-electrophotographic photoreceptor 20 for image display through an f/theta lens 16 and a mirror 17. This photoreceptor 20 moves in the direction of the arrow, and is doped with polyethylene terephthaladium, which is made unique by providing a thin film of indium tin oxide on its surface, and is sensitive to near-infrared light emitted by a semiconductor laser. , is used. A developing device 21 is provided opposite the exposure position of the photoreceptor. The developing device is provided with a sleeve 26 having a magnet 22 inside, and the magnet 22 rotates in a fixed direction. (not shown)
It is M controlled and comes into contact with the 2Ω surface of the photoreceptor. Since the width of the area where the developer 24 is in contact with the surface of the photoreceptor is much larger than that of the laser beam, development continues even after the exposure with the laser beam is completed.

A DC voltage is applied between the sleeve 26 of the developing device and the base of the TE element 20 by a DC voltage source (not shown). Near the position where exposure and development are performed, there is a roller 25.
26 is provided to keep the photoreceptor 20 smooth and to maintain a constant distance between the photoreceptor surface and the sleeve of the developing device with high precision.

The toner image formed on the surface of the photoreceptor at a position facing the developing device is sent to a display section 60 in which a transparent glass plate is arranged.
At this position, the movement of the photoreceptor 20 is temporarily stopped.

The toner image on the photoreceptor 20 sent to the display section 60 is read with the naked eye at this position.

The lamp 31 is for erasing the history of the photoreceptor, and is turned on only while the photoreceptor 20 is moving, and is turned off when the photoreceptor 20 stops.

When changing the displayed content, the photoreceptor 20 is moved again and the photoreceptor is used again.

FIG. 3 shows another embodiment of the display device, in which a stasis array 50 is used instead of a laser beam as the scanning means for image recording. The stylus array 50 receives an electric signal corresponding to the video signal from the reading device, and uses heat, electric field, magnetic field, and other energy generated in the stylus to drive the recording belt (for example, electrochromic material, etc.) 5
1 is scanned and the image is displayed.

The reading device of FIG. 1 and the display device of FIG. 2 are connected by an electric circuit. Both devices may be integrated into one device, or may be separate and connected via a communication line.

By outputting a signal in synchronization with the recording scan of the water device, sending this signal to the reading device, and synchronizing the reading scan of the reading device with this signal, one line is stored as the memory 10 for storing the video signal. Alternatively, it is possible to use a small-capacity device that stores video signals for several inches, eliminating the need for a high-capacity memory that stores video signals for one frame or more, making it an extremely low-cost device. did.

FIG. 4 shows a configuration for generating a synchronizing signal in the display device shown in FIG. Main scanning is performed from point to point B. The laser beam scans the main scan from point A to point B. At the same time, the photoreceptor 20 scans the photoreceptor with the laser beam reflected by the polyhedral mirror 15, which moves in the direction of arrow A, which is approximately perpendicular to the main scanning direction a. An image can sometimes be formed on a photoreceptor by modulating (turning on and off) laser light in response to a video signal. A light modulation element such as a semiconductor laser element or a Kerr cell is used.

In FIG. 5, a photodetector element 52 for detecting the laser beam and the combined light is arranged near the side edge of the photoreceptor 20 in the main scanning area of the laser beam. The photodetector element 52 and the end of the photoreceptor 20 are positioned at fixed positions.

The polyhedral mirror rotates at a constant speed of 1 sq.

If modulation of the laser beam is started when a certain period of time has elapsed since the laser beam was detected by the photodetector element 52,
An image can be formed at a predetermined position on the photoreceptor.

FIG. 6 explains the generation timing of the synchronization signal and the modulation timing of the laser beam by the video signal.

After the laser beam scans point A, it is detected by the light detection element 52 and generates a pulse d. When a certain period of time has elapsed from the leading edge (or trailing edge) of this pulse, the video signal e is sent to the laser modulation element to modulate the laser beam. Thereafter, when the laser beam passes through point B, the next surface of the polygon mirror 15 becomes a reflective surface for the laser beam, and the laser beam returns to point A and repeats the same process. Pulse d output from photodetector element 52
is sent to the reading device as a synchronization signal. In the reading device,
The reading scan is controlled by this synchronization signal. That is, the motor M3 of the reading device receives the synchronization signal d sent from the display device.
driven by O, which allows the scanning of both devices to be synchronized.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a video reading device to which the present invention is applied;
Figure 2 is a configuration diagram of the optical display device, Figure 6 is a configuration diagram showing another embodiment of the display device, Figure 4 is a configuration diagram for creating a line synchronization signal, and Figure 5 is a diagram showing the configuration of the synchronization signal and video signal. FIG. 1...Film 2...Lamp

Claims (1)

[Claims] Information characterized in that it has a display means for displaying information by scanning, outputs a signal in synchronization with the display scan of the display means, and controls the reading scan of the information reading means by this signal. Display device.