JPS60249178A - Display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device that forms an erasable image on an image carrier such as a photoreceptor belt, an insulating drum, or an insulating belt, and particularly relates to a display device that forms an erasable image on an image carrier such as a photoreceptor belt, an insulating drum, or an insulating belt. #'i, a terminal device or a reader device that reproduces and displays image information converted into an electrical signal outputted from R, or image information stored on a magnetic tape or isobaric as an acid soft copy, as a visually recognizable image; CRT (cathode ray tube) display devices and liquid crystal display devices have been put to practical use as image devices for use as image monitor devices in office automation devices such as copiers and other image-related equipment.

Among these, CRT display devices are the most commonly used and highly reliable devices, but they can display small characters such as those used in newspapers and magazines, especially small characters with a large number of strokes such as kanji. Displaying the image in its original size is not possible due to resolution constraints. Although the text is enlarged to make it easier to decipher, the number of characters that can be displayed on the screen decreases in inverse proportion to the enlargement rate, resulting in a problem in that the amount of information on both sides decreases.

9. If the same image is displayed continuously for a long time, the screen will be burned in and the display performance will decrease. Furthermore, if both sides flicker, the eyes will be tired. Next, although liquid crystal display devices have recently been put into practical use, they not only have insufficient resolution like CRT display devices, but also have the problem of being difficult to create large screens and being expensive. Chiru.

Therefore, the present applicant previously proposed an image display device using electrophotography as a fifth image display device that does not have the above-mentioned drawbacks (Japanese Patent Application No. 56-197410-1974).
No. 15). This display device reproduces and displays image information as a toner image, has excellent resolution, makes the image easy to see, can be manufactured with a large screen at a relatively low cost, and is a highly reliable device. This electrophotographic image display device scans, for example, an endless belt-shaped electrophotographic photoreceptor with nine light beams modulated by an image signal to form an electrostatic latent image on the photoreceptor. The latent image is developed with toner to form a toner image, the toner image forming area on the photoreceptor is moved to the display area, and the toner image is visually viewed on the display area.After one display is completed, the photoreceptor is moved. By cleaning the toner image with a cleaning section and erasing the image, the photoreceptor can be used repeatedly.

However, in image display devices using electrophotography, a photoreceptor serving as a display surface moves between an image forming section and a display section. Therefore, if the photoreceptor is moved, the formed image will be erased, and if the currently displayed image and the previously displayed image are related, both images cannot be viewed at the same time. There wasn't.

For example, when the explanatory text and drawings of a patent publication are displayed as separate images, in order to compare and read the explanatory text and drawings, after displaying the explanatory text image, move the photoreceptor to see the drawings. It was extremely inconvenient to display both images side by side and at the same time.

Additionally, it takes several seconds for the next image to be displayed after visually viewing both sides displayed on the display, so viewing many images one after another can be extremely time consuming and reduce work efficiency. There were some disadvantages.

Also, when adding new information to the image displayed on the display, for example, if you want to add information such as a number or memo to an image such as a drawing of a patent publication displayed on the display, you may want to add this information. There was the inconvenience of not being able to add more.

The present invention aims to solve the above-mentioned problems by forming a plurality of images on an image carrier, making it possible to selectively erase the plurality of images, and placing a transparent sheet over the display surface of the image carrier. , information is written and erased on the transparent sheet, and the plurality of images formed on the image carrier and the information written on the transparent sheet are optically superimposed and displayed simultaneously on the display unit. The present invention will be described below with reference to the drawings.

[Structure of the invention]

1 and 2 of the drawings show the entire image display device, with FIG. 1 being an external perspective view and FIG. 2 being a vertical sectional view. In the figure, 1 is a vertical device exterior forging, a display image peep hole is formed with a large opening on the front panel of the 24-i exterior panel, and 6 is a display window located on the upper surface of the front panel with the lower part thereof protruding forward. Operation panel, 4 is a display window glass placed in window hole 2, 5A (5B),
6A ((SB), 7A (7B) and 8 A (8B) external cane devices! If, 2 sets each at the top and bottom of 1, with the axes in the left and right direction of the exterior casing, parallel to each other, and freely rotatable individually. This is an endless belt-shaped photoreceptor suspension support roller that is disposed with a bearing on the support roller.

Laura Wang and 5B, 6A and 68. i, 7B1 and 8B are arranged side by side in the axial direction, and as shown in FIG. 9A is stretched out, and rollers 5B and 6B on the right (111) are stretched.

7B and 8B have a second endless belt-shaped photoreceptor (hereinafter referred to as a photoreceptor).

(referred to as the second belt) 9B is stretched.

Incidentally, the photoconductor may not be made endless, but may be made with ends.

For example, the base layer of 9A and 9B is a transparent sheet such as a polyester sheet, and a very thin layer of metal is deposited on the outer surface of the notebook to substantially maintain the transparency. It is entirely flexible and is made by providing conductivity and forming a photosensitive material layer (photoconductive layer) such as CaS on the metal-deposited surface side. It is suspended and supported by the book's a-a.

Of each roller 58-B&, 5B-8B, roller 5A, 5
B is used as drive a-2. The roller 5A is connected to the first motor M1, and the roller 5B is connected to the second motor M2, and each motor M1 and M2 rotate independently, so that the rollers 9A and 9B rotate independently. and when the first motor M1 is driven, the first bell)9
When A rotates and the second motor M2 is driven, the second bell)9
B rotates.

at least one set of other rollers, e.g. o, -56
A, 6B i;jbe/l/to acts as a tension roller and applies tension to the suspended belts 9A, 9B. Therefore, five drive rollers (5B) are driven by motor M1. (M2)
When rotated and driven in the counterclockwise direction in FIG. 2, the suspension belt 9A (9B) rotates counterclockwise without waving, sagging, or slipping. Along with this rotation, a-ra 5A
(5B) and 8A (8B), belt 9A
The outer surface of the tension side of (9B) moves through the display screen viewing hole 2 from the bottom to the top.

t7A (17B), 18A (18B), 19A (19B
), 20A (20B), 21 (21B) and 22A (2
2B) V! Two pairs of endless transparent foot hanging support rollers are disposed in the upper and lower parts of the exterior casing 1, parallel to each other with their axes extending in the left-right direction of the exterior layer, and individually rotatably supported by bearings. a-ra 17A and 17B, 18A
and 18B, 11 and 19B, 20 people and 20B, 21A
and 21B, 22 people and 22B ii arranged axially side by side, rollers 17A, 18A, 19A.

20A, 21 A, 22A K is the endless first transparent sea)
21 is stretched, and rollers 17B, 18B, 19B, 2
An endless second transparent sea (23B) is stretched across 0B, 21B, and 22B. Note that the transparent sheet 23A may be made with ends instead of being endless.
It is disposed opposite to 9A so as to gravity, moves around the first belt, and has approximately the same width as the first belt 9A. The second transparent notebook 25B is disposed facing the second bell (25B) so as to be overlapped with the second bell (25B) at a slight distance from the line, and moves around the second bell (9B). 1st. Second transparent coat 21
A.

25B slides on the surface of the display window glass 40, and the first. It is better to make the interval between the six opposing belts parallel to the second belts 9A and 9B and the transparent sheet as narrow as possible.

1st. The second transparent sheets 23A and 23B are transparent and made of flexible synthetic resin (for example, polyolefin).

It is made of a sheet of polyester (polyester) and has information written on it using a writing instrument such as a felt pen using water-based ink.
Constructed of a material that can erase written information.

Of each roller 17A-22A, 17B to 22B, a-
The rollers 20A and 20B are used as a stacker 10-ra, and the roller 20A is connected to a fifth motor (not shown).
20Bll'i is connected to a fourth motor (not shown); 4th motor is independent 1. The rollers 20A and 23B can each be rotated and moved independently.
and the roller 20B is connected to the second motor M2 via the clutch, and the first transparent sheet is connected to the first motor M2 through the clutch.
25A may be moved synchronously, and the second bell 9B and the second transparent sheet 25B may be moved synchronously.

24 is an erasing brush; second transparent sheet 25A,
218K It can be manually moved between a contact position and a separation position, and when the brush 24 is brought into contact with the transparent sheet while moving the transparent sheet, the ink on the transparent sheet is removed by this brush, erasing the written information. can do. The brush 24 is made of a flexible fiber material such as felt 9. Information can be easily erased by pressing the plan 24 against the glass plate 4 through a transparent sheet.

The brush 24 is the first brush. It is also possible to arrange brushes facing each transparent sheet, each having a width that can contact the entire width of the second transparent sheet, and to selectively move each brush to the erasing position.

25 Lamps to illuminate each transparent sheet 23^, 23B,
26 sleeves transparent/-to 23A, 23B and belt? A.

IEO is a photoelectric conversion means that reads the news and images formed on 9B through the optical lens 27 and converts them into electrical signals.
In a one-dimensional image sensor such as D, a large number of photoelectric conversion elements are arranged in a row in the width direction of a transparent sheet.

10 is a laser beam scanning type image exposure device disposed in the inner space of bells 1-9A and 9B, which includes a semiconductor laser oscillator 11, a polygon mirror scanner 12, and an fθ lens (
It has an imaging lens) 15, a reflecting mirror 14, and a transparent plate 15. The transparent plate 15 is the above-mentioned belt hanging support Mealough A,
In this image exposure device 410, a transparent flat plate such as a horizontally elongated glass plate or a plastic plate is placed in pressure contact with the inner surface of the tension belt portion between 7B, 8A, and 8B with a moderate force. , an intermittent laser beam L corresponding to time-series electric pixel signals supplied from a computer, an image reading device, etc. is connected to a semiconductor laser oscillator 11 in the front of the drawing.
The laser beam is oscillated toward the rotating polygon mirror scanner 12 at the rear of the drawing. The laser beam L incident on the scanner 12 is photographed in the belt width direction, and is captured by an fθ lens 13 and a reflecting mirror 14 . a-rough A, 7B and 8A along the path of the transparent plate 15
, 8B) enters the inside of 9A and 9B, and is scanned by the laser beam in the belt width direction. In this case, one image is created by the laser beam from inside the belt, with this laser beam scanning as the main scanning and the rotational movement of the bell 9A or 9B as the sub-scanning.

16 is a toner developer disposed on the outer surface side of the belt between rollers 7A, 7B and 8A, 8B, and the development area of this developer is equal to the sum of the widths of 9A and 9B (2 belts), etc.17
Squid, set slightly wider than tore, both bells) 9A, 9
The latent image of B is developed in one layer, the toilet bowl 16 □. still,
The transparent plate 15 is disposed with its lower surface slightly protruding downward from the common contact hole on the lower side of the rollers 7A, 7B and 8A, 8B, so as to be in pressure contact with the inner surfaces of the belts 9A, 9B.

Figure @4 shows the mechanism of the developing device 16. 36 is a container of the developing device, inside which is a sleeve 55 having a magnet 54.
The magnet 54 is rotationally driven in the direction of the arrow by a developing motor (not shown). Reference numeral 37 denotes a support shaft that supports the container 36 in a swingable manner, and 58 represents a spring that supports the container 36 on the shaft 57.
Force it to rotate clockwise around . container 36
is connected to the plunger 40, and when the plunger 40 is off, the sleeve 55 is separated from the belt and the developer 16 is placed in a non-developing position. When the plunger 40 is turned on, the container 56 rotates counterclockwise, and the sleeve 55 approaches the belts 9A, 9B, allowing the electrostatic latent image to be developed with toner. A DC developing bias voltage is applied between the sleeve 55 and the conductive layers of the belts 9A' and 9B.

However, the rocking of the developing device 16 in the case of the present invention is not an essential problem, and the purpose is to prevent the photosensitive belt from being stained by toner by leaving the device for a long time.

゛The laser beam exposure apparatus 10 shown in FIG. 2 sets the main scanning distance of the laser beam to the total scanning distance lI! I# (belt 9A,
When the laser beam scans the entire width of the two belts, two images are written (exposed), and only the first belt 9A is scanned. When this happens, an image is written only on the first belt 98, and when only the second belt 9B is scanned, an image is written only on the M2 belt 9B.

In addition, it is preferable to provide an exposure device corresponding to each bell) 9A and 9B.

Here, the image forming 1 display and image erasing operations of the display device will be explained.

First, after setting necessary conditions such as calling up image information and specifying the image display position by operating the buttons on the operation panel 3, a 1 display start command is input manually, the plunger 4o is turned on, and at the same time the motor M1. M2 rotates synchronously (at the same speed) in the forward direction (- indicates a bell which is a photoreceptor), and 9A and 9B rotate and move in the direction of the arrow at a predetermined speed. Next, laser beam scanning exposure of the designated image information is performed on σ-rough A, 7B and 8
A.

Starting from the inner surface of 9A and 9B (bell between 8B), exposure scanning of the two parts is performed. At the same time as this exposure, the toner from the developing device 16 placed at the development position acts on the outer surface of the belt, so toner images corresponding to the exposed images are sequentially formed on the outer surface of the belts 9A and 9B. As the belt rotates, the two toner images rotate from bottom to top from the bottom to the top of the display window 2 and move to the designated window 2 range position. 9A.

The rotation of 9B is stopped at the same time. At this time, plunger 4
0i1 is off and 9, the developing device 16 is belt-' 9A,
It is separated from 9B and placed at a non-developing position. As a result, two images are displayed in the second window hole.

The image is visually recognized through the display window glass 4.

Then, according to the belt re-rotation operation command, the shimotor M1 or M
When 2 is rotated forward, the bell) 9A or 9B moves again in the direction of the arrow, and the next display 1ifiiyI moves to the window hole range position, and the next screen is displayed. After the image is displayed, the toner image on the outer surface of the belt reaches the toner developing unit 16 placed at the developing position as the belt rotates, where it is cleaned and removed by a developing brush, and immediately after this cleaning, a new toner image is generated. A new toner image is formed by simultaneous exposure and development. As mentioned above, the developing device also serves as a cleaning means.

In this way, image information is reproduced and displayed as a toner image,
In addition, since the image exposure is performed using a very narrow laser aperture, it is possible to display a high resolution image that allows fine characters and other images to be displayed clearly and easily, and a toner application method is adopted at the same time as exposure. Therefore, it has an extremely simple structure that does not require corona charging means or special cleaning means, and can be manufactured with a relatively monovalent display device with a large screen, making it possible to construct a highly reliable display device with less failure and photoreceptor deterioration. obtain.

Figure 5 shows an example of the configuration of the control section of the device in Figure 1, and 7
Reference numeral 0 denotes a sequence controller, which recognizes operations specified by the operator based on input signals from various designation operation panels 6, such as designation of start of display operation, designation of display page, etc., and controls and manages predetermined operations. The operation panel 5 also includes a switch S for setting an image to be formed on the first belt 9A, a switch s for setting an image to be formed on the second belt 9B, , 1st, ? IC2 bell) There is a switch S which is set to form two u[ii] side by side at 9A and 9B. The switch S1 erases the image formed on the first belt 9A and also erases the image formed on the first belt 9A.
? It is a switch that forms a different image, and it is also a switch S.
, is a switch that erases the image formed on the second bell) 9B and instructs the second bell) 9B to form a new IIF image. This is a switch that instructs to erase the image L and to form a new image on both belts. 71 is a control circuit for the motor M1 for rotating the roller 5A that drives the first bell) 9A; 72 is a control circuit for the motor M2 for rotating the roller 5B that drives the second bell) 9B;
73 is a drive circuit for the plunger 40, 74 is a developing device "a16"
Drives the developing motor and applies +200V to +300 V to the developing device.
a development v5 drive circuit that applies a DC development bias voltage of v;
75 is a circuit that drives the scanner 12, and 76 is a circuit that drives the laser oscillator 11. Reference numeral 77 is a belt clock sensor, which detects when the drive rollers 5A or 5B rotate by a certain angle, that is, when the belts 9A or 9B are A pulse P is generated every time it moves a certain length.

If motor M1 is driven independently, Lonia 5A
From the photo encoder attached to the motor M
When roller 2 is being driven independently, a pulse P is generated from a photo encoder attached to roller 5B. Furthermore, if they are driven at the same time, a pulse P is generated from one of the photo encoders.

The sequence controller 70 counts the number of belts, measures the amount of movement of the belt, and controls movement and stopping of the belt.

The scanner drive circuit F@75 drives the scanner 12 which scans the laser beam from the oscillator 11 in the main scanning direction. The laser drive circuit V@76 controls the laser oscillator 11, turns the laser beam on and off according to the image signal, and also turns off the laser beam in a non-writing area in the scanning direction. When the switch 6 is operated, the sequence controller 70 generates a blanking signal used to scan only the first bell (9A) with a laser beam, generates a sing signal,
When the switches S and 3 are operated, an unblanking signal is generated which is used to scan the first bell (9A) and the second bell (9B) with the laser beam, and these signals are sent to the laser drive circuit. Further, when the switch S is operated, the 1a-ra drive motor control circuit 71. The first motor M1 is turned on by K, and the belt 9A moves in the direction of the arrow in FIG. At the same time, the plunger 40 is turned on by the plunger drive circuit 75, and the developing device 16 is placed at the developing position VC. When the switch S1 is operated, the second motor M2 is turned off by the 20th drive motor control circuit 72, and the second belt 9B moves in the direction of the arrow. At the same time, the plunger 4° is turned on by the plunger drive circuit 73, and the developing device 16 is placed at the developing position.

Reference numeral 80 denotes a buffer memory for storing a video signal sent from an image reading device or an external device such as an external storage device. If the reading speed of the image reading device in the sub-scanning direction and the transfer speed of 9A and 9B are synchronized, a buffer with a storage capacity of one line (for main scanning) or several lines may be sufficient, or if they are asynchronous, is a buffer with a storage capacity of one page or two pages. When @Run is formed independently on each page of the belts 9A and 9B, one page is sufficient, and when outputted at the same time, two pages are required.

FIG. 6 shows the operational procedure of the apparatus shown in FIG. 5 when there is an image display command. First, the user instructs to call up two images to be displayed on the operation panel 6, and operates the switch S (step 100).

When the switch S is turned on, the lebranger 40 is turned on, the motors M1 and M2 are driven, the rollers 5A and 5B are rotated in the direction of arrow a, and the rollers 9A and 9B are moved, and the developing motor is driven. The grinding stone 34 rotates, and the current grinder 1
A developing bias voltage is applied to 6 (step 101).
, , , the plunger 40ij is on, and the developer 16 is the developer @Key. When the belts 9A and 9B rotate, counting of pulses P is started (step 102),
The entire main scanning range of the belt 9 is exposed and scanned by the laser beam (step 105). When the laser beam scans the first belt 9A, it is second-modulated by the image signal for one page stored in the first area of the memory 80, and when it scans the second belt 9B, it is second-modulated by the second image signal stored in the first area of the memory 80. It is modulated by the image signal for one page stored in the area.

When the writing (exposure) of image signals for two quadrants onto the belts 9A and 9B is completed (step 104), a bell) 9
When the rear end of the exposure area of A and 9B passes the developing position, the developing motor stops, the current bias power source is turned off (step 1OS), and the plunger 40 is further turned off, and the developing device 16 goes to the non-developing position. Then, when the count value of the pulse P reaches a predetermined value (step 1θ6), the motors M1 and M2 are simultaneously stopped (step 107) (bell) 9
A.

9B stops. At this time, the two IIvii units formed in bells 9A and 9B are placed in the display window hole 2, allowing the operator to compare the two images and read them from the force.

FIG. 7 explains the state of the image displayed on the display unit, and shows the first image formed on the first bell) 9 AK shadow formed, and the second image formed on the second bell) 9B. can be viewed simultaneously on the display section. Here, for example, the first
If the image T is the image of the first page that describes the explanation of Figure 1 of the patent publication, and the second image T is the image of Figure 1 of the patent publication, then the related explanation and You can view it by comparing it with the drawing.

Next, when changing the first image T1 to the image on the second page of the patent publication without changing the second image I, the operation panel 3
1st bell) Image to be displayed on 9A CM 2nd page image)
After instructing, operate the switch (step 11).
0). When the switch S1 is turned on, the granger 40 is turned on (step 114). By turning on the plunger 400, the developing device 16 moves to the developing position. Next, motor M1
However, only 9A (bell) is exposed and scanned by the laser beam (step 116), and the first
A new picture 18 is written on bell 1-9A. When scanning the laser beam 9A, the laser beam is modulated by the image signal of the second page image stored in the memory 5olcF. In addition, as the first painter (1st bell) 9 A l: moves in the direction of the arrow, when it reaches the developing device 16, it is cleaned and removed by the developing brush - this cleaning Immediately after receiving the toner image, a new toner image is formed by undergoing simultaneous exposure and development.

When writing of the image signal to the first belt 9A is completed (
Step 117 ), &! to the first belt 9! When the rear end of the original area passes the development position, the development motor, development bias power supply, and plunger 40 are turned off (step 118).
), after which the drive of the motor M1 is stopped via step 106j07.

When the drive of the motor M is stopped, the display window 2 displays a first image consisting of both images of page gX2 of the patent publication, and a second image consisting of the image of FIG. image is displayed, and the modified first image on the first belt and the continuously displayed second image on the second belt can be viewed simultaneously. If you want to change the second image to the image in FIG. 2 of the patent publication without changing it, after specifying the image to be displayed in the second bell) 9BK,
Operate switch S (step 120). Switch 8. , the plunger 40 is turned on (step 124).

When the plunger 40 is turned on, the developing device 16 moves to the developing position. Next, the motor M is driven (step 125), and only the second bell 9B is scanned by the laser beam (step 126). When the laser beam scans the second belt 9B, it is changed by the image signal of the image shown in FIG. 2 of the patent publication stored in the memory 80. When writing of the image signal to the second belt 9B is completed (
Step 127), when the rear end of the exposure area of the second belt 9B passes the development position, the development motor, development bias power supply and plunger 40 are turned off (Step 12B);
After that, the driving of the motor M is stopped through steps 106 and 107. When the motor drive stops, the display window 2 displays a first image consisting of the image of the second page of the patent publication that was previously displayed, and a second image consisting of both images of Fig. 2 of the patent publication. The images are displayed and both modified @2 images and the unchanged 10th image can be viewed simultaneously.

After this, if you want to erase and change the 1-car 1t T1 r 12, just operate the switch S. Next, a case will be described in which a large number of images are observed one by one in sequence. For example, as shown in Figure 7, the first bell)? Assume that a first image I is formed on A, second images I are formed on a second bell) 98, and both images T, , T, are simultaneously displayed on the display unit 2. First, the first bell) 9A
Visually view the first image 11 above, read the contents, and select this image I.

After reading the content, the user visually views the second image It on the second bell 9B and reads the contents. In this case the first image 11
When the user has finished viewing the image, the switch 6m is operated to display the next image to be viewed. switch S
1, the motor M1 is driven and the first belt 9 is turned on.
9AK new image is written. Therefore, the second double image I on the second bell) 9B.

While viewing the first belt 9A, a new image is formed on the first belt 9A, this new image is displayed on the display section 2, and the second belt 9A is displayed on the second belt 9A.
Immediately after reading the second nli*Tt on B,
A new image on the belt 9A can be visually observed. 2nd bell) When the reading of the second two images I of 9B is completed, operate the switch S. Therefore, by operating the switch S or B''t each time you finish viewing one image, you can prepare the display of both images to be viewed next while viewing one image on one display section. images can be viewed efficiently and in a short time.

Next, a case will be described in which an image edited by adding additional information to a single image displayed on the first belt 9A or the second belt 9B is viewed.

Now, for example, the first belt? When AI'1E10 picture I8 is formed and this picture *T is displayed in the display window hole 2, letters are written on the first transparent sheet 23A which overlaps with the first belt 9A using a felt ben. , numbers, symbols, etc., the first image T on the first belt, and the first T! The additional information on the light sheet is optically synthesized,
This combined image information can be read.

After reading the synthesized fc image information, if you want to delete the additional information, operate the operation panel 5 to remove the first transparent sheet 2! The blade i# roller 20A that moves the IA is rotated to move the @1 transparent sheet, and at the same time, the brush 24 is pressed against the transparent sheet to erase the additional information written on the first transparent sheet. To read the image information displayed, operate the operation panel 3 to move the first bell 9A and the first transparent coat 23 at the same speed in synchronization, turn on the lamp 25, and
Image 11TI formed on belt 9A and first transparent sheet 2
The information written in 5AIC is synthesized and the photoelectric conversion means 26
The signal is read by the image display device 10 and converted into a direct signal, and this signal is converted into a digital signal and stored in a storage capacity such as a magnetic disk or original disk, or the digital signal is sent to the image display device 10 and displayed on the first belt or the first belt. The combined image information is formed and displayed on two belts.

The second transparent sheet 25B is used in the same manner as the first transparent sheet, and by writing additional information on the second transparent sheet 25B, the display image of the second transparent sheet 9B and the second transparent sheet 25B are Additional information can be combined and read. This composite image information can be read by the photoelectric conversion means 26, and additional information on the second transparent sheet can be read from the plaque 2.
4 will be deleted.

In the above embodiment, two belts are used to display as shown in the seventh haze, but it is also possible to use five or more belts. Further, although the belt is moved in one direction, it may be moved back and forth.

FIG. 8 shows another embodiment of the present invention, in which a banding device sa1.74 is placed around a known electrophotographic photoreceptor belt 500.
An original device 502, a current device 505, and a cleaning device 604 such as a fur brush are arranged.

505 is a display window. 506 is writing additional information;
Erasable transparent sheet, transparent sheet of I@2 diagram) 2
It is configured similarly to 5A and 25B.

With this configuration, a similar effect can be obtained by arranging a plurality of photoreceptor belts 500 in a direction perpendicular to the belt movement direction and driving each belt independently.

The display devices to which the present invention can be applied are not limited to those shown in FIG. 2 and FIG. Examples are shown in Figures 9 and 10.

The image display device in FIG. 9 includes a plurality of heat-sensitive display sheets 5.
62, a visible image is formed by a thermal head 555. The visible image is then erased by the cooling unit S54. 356 is a display window made of a transparent glass plate. 557 is a transparent sheet for writing additional information.

The [IliigI display device shown in FIG. 6340 is a transparent liquid tank, 541 line cleaning equipment ft ~ 542 is a display window, 545Fi added f#
An insulator, which is a transparent sheet for writing on clothing, and which can be used repeatedly with the magnetorice of the present invention, can be used as an image carrier. Further, according to the above display device, a plurality of images can be formed on one image carrier, the plurality of images can be simultaneously displayed on the display section, and the plurality of displayed images can be selectively erased. While the first image carrier on which the image to be viewed is formed is stopped and this image is visually observed, the next image to be viewed is formed on the second image carrier, and the second image is Images formed on the carrier can be moved to the display section, and while these images are being displayed, necessary information is stored in a 41° second transparent sheet that is optically superimposed on each image. This allows additional information to be added to the image on the image carrier and then read. Further, after finishing reading the image formed on the first image carrier,
Immediately, the image formed on the second image carrier can be read visually, and the next image to be read can be formed on the second image carrier and displayed on the display unit. can. Also, two or more related images can be visually viewed while being compared on the display unit.

[Effects of the present invention]

As described above, according to the present invention, a plurality of related images can be selected and viewed simultaneously while being compared, and additional information can be written while viewing these images to read a collection of images. I can do it. Moreover, it is possible to always display a plurality of related images on the display section by changing only the images that no longer need to be displayed.

It can also display multiple images in a short time, making it extremely convenient to use a single display device.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of an image display device showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of the same, and Fig. 3 is a line (line bell) 9A, 9B.
FIG. 4 is a sectional view of the developing unit, FIG. 5 is a control block diagram of the display device shown in FIG.
! FIG. 6 is a flowchart showing an example of the operation of the control section in FIG. 5, FIG. 7 is a diagram for explaining a mental image displayed on the display section, and FIGS. 8 to 10 show other embodiments of the image display device. The outline is (9). 4...Display window glass 9A, 9B 0. , Belt 10...Exposure device 16...Developer 25A, 25B...Transparent sheet Applicant: Canon Corporation

Claims (1)

[Claims] (5) an image carrier that carries a plurality of images; and (5) an image forming means that forms an erasable image on the image carrier; (5) a transparent sheet on which information can be written and erased; A display section that optically superimposes and simultaneously displays multiple images formed on the image carrier and information written on the transparent plate, and selectively erases the multiple images formed on the image carrier. (9) a display device comprising: erasing means;