JPS60213985A - Image display unit - 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 an image display device for displaying data such as a computer or a facsimile machine, and more specifically, the present invention relates to an image display device for displaying data such as a computer or a facsimile machine, and more specifically, an image display device that forms and displays an image on a reusable image carrier that carries an erasable image. This relates to a device for

Generally, CRT (cathode ray tube) display systems are widely used as image display devices for displaying data in computers, facsimiles, and the like.

In such a CRT display system, when adding a new image to the displayed image, a light pen is used.

Additional information is entered using a digitizer or character keys, but this requires equipment to convert the additional information into electrical signals and large-capacity memory, making the equipment configuration complex and expensive. It has become a thing.

As an alternative to such an image display apparatus, the applicant has developed and proposed an image display apparatus using a moving belt-like image carrier.

The contents of this device are as follows.

That is, in FIG. 1, an endless belt-shaped photoreceptor 8 (as an image carrier) is guided by guide rolls 9, 10, 11, and 12 in a predetermined casing 1, and is intermittently driven by a driving means (not shown). A belt-shaped photoreceptor (hereinafter referred to as a belt-shaped photoreceptor) is installed, and the output light of a semiconductor laser (not shown) modulated by an image electric signal is scanned in one direction by a scanner 5, and further transmitted through an f/θ lens 6 and a mirror 7. is provided so that the back surface of the belt-shaped photoreceptor 8 is exposed. The photoreceptor 8 is, for example, a transparent conductive substrate on which a photoconductive layer is provided.

A developing device 15 equipped with a sleeve 17 having a magnet 16 rotating in the direction of the arrow in FIG. The conductive and magnetic developer 18 is uniformly regulated by a blade 19 and comes into contact with the surface of the photoreceptor. A DC voltage is applied between the sleeve of the developer and the base of the photoreceptor by a DC voltage source (not shown), and rollers 13 and 14 are located near the exposure and development positions.
is provided, thereby keeping the belt-shaped photoreceptor 8 flat and keeping the distance between the photoreceptor surface and the sleeve of the developing device constant with high precision. Then, it faces the developing device 15@
The toner image written and formed on the surface of the belt-shaped photoreceptor by the beam irradiation is sent to the display section 2 .

The display section 2 is configured such that a rectangular window hole 3 is provided on the front surface of a housing 1, and the toner image on the photoreceptor can be viewed directly from the outside through a transparent member 4 that covers the window hole 3.

The photoreceptor 8 can be stopped for a specified period of time automatically or by operating a switch when a predetermined visible image area coincides with the position of the window hole 3. The toner image on the surface of the photoreceptor can be visually observed through the window hole 3 and through the transparent member 4.

Note that the lamp 20 is for erasing the history of the photoreceptor, and is turned on only while the belt-shaped photoreceptor is moving, and is turned off when the belt-shaped photoreceptor is stopped.

Further, 21 indicates an operation unit for instructing various operations of the display device.

FIGS. 2 and 3 are explanatory diagrams illustrating the principle of image formation on the belt-shaped photoreceptor 8 used in the apparatus shown in FIG. 1.

The second IA represents the state of charge in the bright part of the image light. Toner 1 to which voltage is applied via sleeve 17
8 comes into contact with the photoreceptor 8, an electric field is applied to the photoconductive layer 8C. At this time, when image light is irradiated, the photoconductive layer 8C
7 photocarriers are generated therein, and these photocarriers are guided near the surface of the photoconductive layer 80 by the action of an electric field. As a result, a strong electrostatic attraction acts between the toner 18 and the photoconductive layer 8C, and the toner 18 is attached to the photoconductive layer 8c, that is, the surface of the photoreceptor 8.

In the illustrated example, the photoconductive layer 8C is an N-type semiconductor, and the toner 18
Since a positive voltage is applied to
is well guided toward the surface of the photoconductive layer 8C. As a result, a strong electrostatic attraction acts between the toner 18 and the photoreceptor 80,
Toner 18 adheres to the photoreceptor.

FIG. 3 shows the state of charge in the dark area. By applying an electric field between the toner 18 and the transparent conductive layer 8b of the base, electrostatic attraction acts between the two, but there is a photoconductive layer 8c between them, so that the distance between them is reduced. Therefore, its power is small. Therefore, the magnetic force generated by the rotating magnet 16 provided inside the fixed sleeve 17, the toner 18
The toner 18 is pulled away from the photoconductive layer, ie, the surface of the photoreceptor 8, due to the adhesion force between the particles.

Note that it is possible to change the toner image on the photoreceptor 8. That is, when the toner-holding portion of the photoreceptor changes to a non-holding portion, the toner 18 whose electrostatic adsorption force has decreased is removed by the magnetic field of the magnet 16, resulting in a bright portion to which no toner is attached. The developing device 15 also serves as a cleaning means. On the other hand, if the toner is to be retained, the carrier e is injected again by the image light, the toner 18 is taken out by overcoming the magnetic field, and the toner is continued to be retained. Therefore, since the toner image on the surface of the photoreceptor does not have any adverse effect on the next image formation, there is no need to provide a separate cleaning means.

In FIGS. 2 and 3, 8a is a polyethylene terephthalate film supporting the conductive layer 8b, and E is a power source for applying voltage to the sleeve.

In the image display device configured as described above, when adding a new image to the toner image that has already been formed, the toner image must be added on the belt-shaped photoreceptor. Adding an image without losing the image requires converting it into a code that is impossible using the process described above, and this poses the problem of complicating the device configuration, similar to the CRT display system. .

The purpose of the present invention is to: without changing the image forming process;
An object of the present invention is to provide an image display device capable of simultaneously displaying an image formed on an image carrier and image information to be added.

Still another object is to provide a low-cost image display device that allows easy input of additional image information, has a simple configuration, and is low in cost.

The present invention includes a first image carrier capable of displaying image information converted into an electrical signal as a visible image, and a transparent image carrier that runs parallel to the display surface of the first image carrier and is capable of inputting additional 117 information. A second image carrier is provided, and images formed on the first and second image carriers are optically superimposed and displayed.

The present invention will be explained below using specific examples shown in the drawings.

FIG. 4 shows an image display device to which the present invention is applied.
In FIG. 4, the same parts as in FIG. 1 are designated by the same reference numerals, and image formation is performed to display image information converted into electrical signals on a belt-shaped photoreceptor (first image carrier) 8 as a visible image. The process is similar to above.

In FIG. 4, reference numeral 30 denotes a transparent and flexible sheet member (second image carrier) carrying additional information, which is adjacent to the transparent member 4 and is suspended and supported by rollers 32, 33, 34, 35. There is. At least one of these rollers rotates as a drive p-roller (in this case, the roller 32 is kept as a drive roller). 31 is pressed against the surface of the sheet member 30 and is made of an elastic member such as felt;
This is a cleaning member that erases an image formed on the surface of the sheet member 30.

The sheet member 30 has an endless shape, runs along the front and back surfaces of the transparent member 4, and is provided with a VC so that the portion facing the display surface of the photoreceptor 8 is parallel to the display surface. When the roller 32 is driven to rotate in the direction of the arrow, the sheet member 30 runs from bottom to top along the surface of the transparent member 4,
It also runs from top to bottom along the back surface of the transparent member 4. The rollers 34 and 35 are arranged in the housing 1 so as to apply a certain tension to the sheet member 30 and to separate the sheet member 30 from the photoreceptor 8 by a certain distance. The separation distance between the sheet member 30 and the photoreceptor 8 should be such that the toner image on the photoreceptor 8 is not adversely affected by the sheet member, and should be as short as possible.The Seimei member 4 should be parallel to the display surface of the photoreceptor 8. It is made of a glass plate with a flat surface, and is disposed between the endless conveyance paths of the photoreceptors 8, and is provided as close to the photoreceptors 8 as possible.

The sheet material is made of transparent polyethylene used in over-head projectors (OHP), etc.

It is made of a synthetic resin sheet such as polyvinyl chloride, and allows information to be written on or erased using a writing instrument such as a felt-tip pen.

In the above apparatus, image information converted into an electrical signal by the above-described predetermined image forming process on the photoreceptor 8 is converted into a visible image (
When this toner image is displayed on the display unit 2, an observer can visually recognize the toner image optically through the transparent member 4 and the sheet member 30.

At this time, new letters and numbers are added to the toner image.

When adding additional information such as graphics, markings, underlines, etc., the additional information is written in ink on a predetermined portion of the sheet member 30 using a felt-tip pen. Therefore, the observer
The toner image formed on the photoreceptor 8 and the ink image formed on the sheet member 30 are optically superimposed and can be visually recognized as a composite image. Note that the display section 2 is illuminated by a lamp (not shown), and the photoreceptor 8 and sheet member 3
A reflected image of 0 will be observed. Since there is a gap between the photoreceptor and the sheet member, strictly speaking, some parallax will occur depending on the viewer's viewing angle, but in reality, the viewer views the composite image almost from the front, so this is not a problem. Must not be.

If the image formed on the sheet member 30 is to be corrected, it can be partially erased and corrected by tracing the ink image on the sheet member using a commercially available erasing gun, cloth, or the like. After observing the displayed image, the ink image on the sheet member 3o is erased by the cleaning member 31, and the sheet member can be used repeatedly. In addition,
The rotation of the roller 32 is performed by turning on a motor (not shown) by operating an operation key on the operation unit 21.

01i'F. Sheet member 30
When all of the additional information is erased, the roller 32 stops, and when a new image is formed on the photoreceptor 8 and displayed, new additional information can be written.

FIG. 5 shows another embodiment of the present invention, which differs from FIG. 4 in that the sheet member has ends. In FIG. 5, parts similar to those in FIG. 4 are designated by the same reference numerals.

130 is a transparent sheet member on which information can be written; 13
6 and 137 are drive rollers, 131A and 131B are cleaning members, and 140 is a camera. The cleaning members 131A and 131B are made of the same material as the cleaning member 31 in FIG. 4. The sheet member 130 is made of the same material as the sheet member 30 in FIG. 4, is flexible, and is provided so as to run parallel to the display surface of the photoreceptor 8 along the surface of the transparent member 4. This sheet member 130 has a length that is at least twice the vertical length of the display section 2, and has one end connected to the drive roller 136 and the other end to the drive roller 1.
37 so as to wrap around drive rollers 136 and 137. The drive rollers 136 and 137 are each connected to a motor, and when the sheet member 130 is caused to travel upward, the sheet member 130 is wound around the drive roller 13'7 by rotating the drive roller 137 counterclockwise. , the ink image on the sheet member 130 is erased by the cleaning member 131A when the sheet member 130 travels upward. Conversely, when moving the sheet member 130 downward, the driving roller 136 is rotated clockwise so that the sheet member 130 is wound around the driving roller 136, and the cleaning unit 131B cleans the surface of the sheet member 130 while moving downward. The ink image is erased. Photoreceptor 8
When recording and storing a composite image consisting of the above toner image and the ink image on the sheet member 130, the image on the photoreceptor and the image on the sheet member are combined and the camera 140
Take a photo. The camera 140 is a known microfilm camera, television (video) camera, or the like, and the captured images are recorded on microfilm, magnetic tape, or the like.

The image display device of the present invention is not limited to the embodiments, but may be formed by, for example, forming a toner image on a known electrophotographic photoreceptor by a known charging/exposure process, erasing this with a cleaning means, and repeating the process. It can also be applied to a display device in which an erasable image is formed on a belt-shaped display sheet by an inkjet or an image erasable by a thermal head is formed on a heat-sensitive display sheet.

As described above, according to the present invention, an image formed on an image carrier capable of displaying image information converted into an electric signal as a visible image and additional information to be newly added to this formed image are simultaneously displayed. Unlike the conventional CI'LT display method, there is no need for a device to replace additional information with electrical signals or a large-capacity memory, and the structure of the device is simple.
Moreover, it is inexpensive, and additional information can be easily formed, and furthermore, additional information can be easily changed, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional electrophotographic display device, and FIGS. 2 and 3 are explanatory diagrams of the image forming principle applied to this display device. 8...Photoreceptor 15...Developer 30. ...Seat part side 31...Cleaning member. Applicant: Canon Co., Ltd.: i'4j, yE, CIK Figure 1

Claims (1)

[Claims] A first image carrier carrying erasable image information, an image forming means for forming an image on the first image carrier based on the image information converted into an electrical signal, and a display surface of the first image carrier. an image display device comprising: a transparent second image carrier that runs in parallel along and allows input of additional information;