JPS5931987A - image display device - 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, and more particularly to an image display device using a photoreceptor having a single photoconductive layer provided on a transparent substrate.

The present inventors previously proposed the following image display method using electrophotography as a display device that enables large-screen display.

A light image is irradiated onto the inner peripheral surface of a belt-shaped photoreceptor supported in an endlessly movable manner using an exposure means such as a laser beam or an LED array to form a latent image. The latent image is developed by supplying developer from the part (Il+).In this method, the screen size is not limited as in the case of a CRT display or a liquid crystal display.
Furthermore, a high-resolution image 21 is possible. However, in this method, since development is performed almost simultaneously with the irradiation of the light image, contamination of the light image irradiation surface due to scattered toner or floating toner particles poses an obstacle to practical application.

I put it out.

The present invention has been made in view of two points, and relates to a novel and excellent image display device. Hereinafter, specific examples will be explained with reference to the drawings.

is an exterior cover, 2 is a transparent glass provided between the front surfaces of the exterior cover, and 3 is a front protrusion of the cover. Perform processing operations.

An image forming section is provided inside the exterior cover 1.

This image forming section includes a driving roller 4, a supporting roller 5. (
i, 7, a belt-shaped photoreceptor 8 stretched over these rollers;
, a semiconductor laser oscillator 9 provided inside the photoreceptor 8, a laser scan device 1 (), an fθ lens 11, and a mirror oscillator 9 provided inside the photoreceptor 8. -12, and a developing device 13 provided outside the photoreceptor 8 in the exposure section.

A motor 14 is connected to the shaft end of the drive roller 4 to transport the belt-shaped photoreceptor 8. At least one of the support rollers 5, 6.7 (for example, the support roller 5) is movable, and is supported by a spring or the like to apply upward tension. By applying a predetermined tension 3, this prevents the belt-like photoreceptor from waving and sagging, and also prevents the belt-like photoreceptor 8 and the driving roller 4 from slipping.

The belt-shaped photoreceptor 8 is attached to a transparent plate L as shown in FIG. 2 (8).
A transparent conductive layer 16 made of a very thin layer of gold, indium tin oxide, etc. is deposited on the outer surface of the polynisdel sheet 15, and a photosensitive layer such as CdS is placed on the side. The polyester sheet 15 inside the photoreceptor 8 is in contact with the photoreceptor 4.5.fi, 7.

A laser beam modulated by an image electric signal is emitted from a semiconductor laser generator 9. This laser beam passes through a skinner 10, an f-theta lens 11, and a mirror 12, and then reaches a belt-shaped photoreceptor 8. Inside (polyester seam) 15 Tsukuda)
is irradiated to form a latent image on the photosensitive layer 17. An f-shielding glass 18 is provided at a position slightly protruding from the common tangent of the support rollers 6 and 7 so as to be in contact with the inside of the belt-shaped photoreceptor 8 in this exposure section. Both end faces of the protective glass 18 in the moving direction of the photoreceptor 8 are chamfered so that the photoreceptor comes into smooth contact with the photoreceptor during movement. This protective glass 18
Also, the vertical vibration of the photoconductor 8 caused by contact with the developing brush (brush-like spikes of developer formed by a magnet) of the developing device 13 is caused by the undulation of the photoconductor 80 due to movement. This improves resolution by keeping the exposure position constant.

An image V, 1 formed on the outer peripheral surface of the belt-shaped photoreceptor 8 by the image forming apparatus of the note, as the photoreceptor 8 moves in the direction of the arrow A, is moved 1d in the direction of the transparent glass 2. The continuous registration is stopped temporarily and the display is changed to 1 (1). After that, the display is stopped and the image is sent to the exposure section again by the movement of the photoreceptor 8, where it is cleaned by the developing brush. Immediately after, a new image is formed through the exposure and development processes again.The image display device to be improved by the present invention has the basic configuration as described below. It is inconvenient for the scattered toner from the developing device 3 to adhere to the inside of the exposed area, that is, the inside of the polynisdel sheet 15, or for the formation of toner that has fallen off from the surface of the photosensitive layer 170. -゛Oversakaki; And if the transmission of laser light is sometimes blocked, a normal electrostatic latent image cannot be formed.

The device of the present invention solves these problems as follows.

Figure 3 is a cross-sectional view of the optical part IZ (1) of the apparatus of the present invention, and Figure 4 is a perspective view of the optical part. A dustproof shield cover 19 is provided at the top, and cleaning rods 20 and 21 are provided at the tip of the shield cover 19 for sealing and cleaning the inner surface of the photoreceptor 8.

As shown in FIG. 4, the shield cover 19 houses optical components therein. 22 is a stay to which optical components are attached.

When the photoreceptor 8 rotates counterclockwise in the direction of arrow A, the cleaning rod 20 removes contaminants adhering to the inner surface of the photoreceptor 8 just before entering the exposure process, thereby helping to form a normal latent image. .

On the other hand, the cleaning rod 21 is used to rotate the photoreceptor 8 in the opposite direction, i.e., to the right, when it becomes necessary to view the images once again before the two images on the photoreceptor 8 are erased. 111 and display line ♀, clean the inside of the photoreceptor 8 just before entering the city to prevent contaminants from adsorbing to the contact surface of the tφ glass 18.

The cleaning rods 20, 21 are made of felt or sponge (as shown in FIG.
-1), a wiping part 4 such as a brush (No. 51/XI Ibl); t 25 is provided. The support rod 24 is mounted by fitting the groove 23 of the support rod 24 into the rail 26 formed at the tip of the inside 9 of the shield cover. If the wiping part 25 becomes dirty, remove the cleaning rod 20, 2 from the rail 26.
(Remove, clean entire area or wipe part (2)
Exchange only 5. , Leaning rod 2 according to Fig. 6
In other embodiments of 0 and 21, the elastic wire 4A made of the central part of the support if/P27 &i-ul/tango seam 1- etc.
28 full crotch kl, 7 erts on both sides of the gono sheet 28, 7 erts, sponges, etc. wiped t'As material 2r9'i integrally clamped (r), an example of a sea urchin configuration (Fig. 6 (lI+) Also, there are wiping tools such as brushes on both sides of the elastic member 28 (
The structure 30 may be integrally held by the support rods 27 (FIG. 1 (h)).
1) Clean the attached dust, toner, etc. using the member 28.
] or just the wiping member.

In this way, the shield cover 19 is provided around the optical components, and the tip of the shield cover 19 is used to clean the inner surface of the photoreceptor 8 just before entering the exposure area.
, 21, normal latent image formation can be performed. Further, in assembling the shield cover and the cleaning device as described above, only the wiping portion of the cleaning device comes into contact with the movable portion, so that the airtightness within the shield cover can be sufficiently maintained.

As described above in detail with specific examples, the image display meter 1 of the present invention
rl is transparent-! A photoreceptor provided with a photoconductive layer on one side, a means for irradiating a light image onto the surface of the photoreceptor, a cleaning means disposed near the light image irradiation position of the photoreceptor, and a cleaning means opposite to the light image irradiation side of the photoreceptor. It is important to have a developer hand) 9 located on the surface side! ? Characteristic 3. The present invention has the above configuration.
], 0, which has the ability to clearly display high-resolution images.

[Brief explanation of drawings]

1 is a perspective sectional view of an image display device according to the present invention; FIG. 2 is a sectional view of the same side; FIG. Figure 4 is a cross-sectional view of the optical part of the base device IT1, and Figure 4 is a mass production [congratulation diagram].
Figure ++tl tbl is an explanatory diagram of an old modification of the cleaning section. In the figure, 1: exterior cover, 2: transparent glass. 3; operation panel; 8; belt-shaped photoreceptor. 62 ((1) No. 2 (α) 謹 (b) Do b closed (b) 7 627

Claims (1)

[Claims] (1) A photoreceptor having a photoconductive layer provided on a transparent substrate, a means for projecting a light image 11α onto the surface of the photoreceptor, and a light image irradiation position 1 on the photoreceptor.
cleaning means arranged near rt and photoreceptor) Y;
An image display device N, characterized in that it has a developing means 17 arranged on the side opposite to the image irradiation side.