JPH0470841A - Photosensitive body integrated with spacer - Google Patents

Abstract

PURPOSE:To prevent discharge breakdown through a spacer as well as to easily maintain a uniform gap between a photosensitive body and an electric charge retaining medium by forming a patterned spacer on the photoconductive layer of the photosensitive body. CONSTITUTION:An electrode 12 and a photoconductive layer 13 are successively laminated on a substrate 11 and a spacer 30 is patternwise formed on the layer 13 by printing or other method. Since the spacer 30 is previously formed in one body, the thickness can be made accurately uniform and a uniform gap can be obtd. only by putting the resulting photosensitive body on an electric charge retaining medium. There is not room for dust, etc., to intrude between the spacer 30 and the photoconductive layer 13 and discharge breakdown can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a photoreceptor used to record an electrostatic image on a charge retention layer by voltage application exposure.

: Conventional Technique (Hote 2) FIG. 7 is a diagram for explaining a conventionally proposed electrostatic image recording method.

In the figure, a photoreceptor 10 has a transparent electrode layer 12 and a photoconductive layer 13 successively laminated on a transparent substrate 11, and a charge holding medium 20 has an electrode @ 22 and an insulating layer 23 laminated in sequence on a substrate 21.
When image exposure is performed from the photoreceptor 10 side, for example, with a spacer 30 interposed between the two facing each other and a voltage applied between the image electrode layers, carriers are generated in the exposed photoconductive layer 13. The insulating layer 23 exhibits conductivity, and discharge occurs between the photoreceptor and the charge holding medium in the exposed portion, and charges corresponding to the amount of exposure are accumulated on the insulating layer 23, forming an electrostatic image.

[Problem to be solved by the invention: By the way, in the electrostatic image recording method shown in FIG. 7, when the gap length between the photoreceptor and the charge holding medium changes, the electric field strength in the gap changes and the discharge current changes, Even if the exposure amount is the same, the amount of charge accumulated on the insulating layer will vary. Therefore, in order to charge the amount of charge according to the amount of exposure, it is necessary to maintain the gap length constant. 7)
Ru. And note Lf: In order to increase the sensitivity, it is necessary to increase the amount of charge formed on the insulating layer 23 for the same amount of exposure, and for that purpose, the voltage applied between the photoreceptor and the charge holding medium must be increased. It is necessary. However, if the applied voltage is increased and, for example, there is dust or the like between the spacer and the photoconductive layer, there is a problem in that discharge occurs in the spacer portion and the expensive photoconductive layer is destroyed. Also,
The gap length between the photoreceptor and the charge holding medium is extremely small (several tens of microns), and the work of interposing a spacer to keep the gap constant is extremely time-consuming.

The present invention: A spacer-type photoreceptor which is intended to solve the above-mentioned problems, and which can easily maintain a constant gap between the photoreceptor and the charge holding medium, and which can also be bent to prevent damage caused by discharge through the spacer. The purpose is to share the same.

Means for Solving the Problems (2) To achieve this, the present invention is characterized in that an electrode layer and a photoconductive layer are sequentially laminated on a substrate, and an insulating patterning layer is integrally formed on the photoconductive layer as a spacer. That is.

For example, as shown in FIG.
The photoconductive layers 13 are sequentially laminated, and spacers 30 are formed in a pattern on the photoconductive layers by printing or the like.

By forming the reserved spacer 30 by printing or the like in this manner, it is possible to make the film thickness constant with high precision,
A certain gap length can be obtained by simply overlapping the photoreceptor and the charge holding medium, and there is no room for dust etc. to get in between the spacer and the photoconductive layer, thus preventing the occurrence of discharge breakdown. I can do it.

In Fig. 2, the electrode layer is formed in a pattern, and a spacer is formed in the area where the electrode layer is formed. Since an electrode layer is formed on the spacer, no voltage is applied, and discharge damage in the spacer portion can be reliably prevented.

In Figure 3, the electrode layer is formed into a pattern as in Figure 2.
In this method, a smooth layer is formed on the substrate on which the electrode is formed, and a photoconductive layer is provided with a thickness of M, which is thinner than the thickness of the spacer. Since no voltage is applied to the part, damage caused by discharge through the spacer can be prevented.

In Figure 4, spacers are provided in advance in a pattern on an electrode layer uniformly formed on a substrate, and a photoconductive layer is laminated in areas where no spacers are provided so that the film thickness is smaller than the thickness of the spacers. This is what I did. In this case, although a voltage is applied to the spacer, since no photoconductive layer is originally formed in the spacer portion, it is possible to prevent the photoconductive layer from being damaged by discharge through the spacer.

In FIG. 5, a recess is formed by etching the center of a substrate 11 made of glass or the like, and an electrode layer 12 and a photoconductive layer 13 are laminated on the recess so that the thickness of the layer is smaller than the depth of the recess. 5 is used as a spacer. In this case as well, since no voltage is applied to the spacer portion and the photoconductive layer is formed (5), it is possible to prevent the photoconductive layer from being damaged by discharge through the spacer.

In addition, in the electrostatic image recording method shown in FIG. 7, the photoreceptor and the charge retention medium are arranged facing each other with a spacer interposed therebetween, but as shown in FIG. Even if the transparent electrode 12 is laminated on an insulating layer, the transparent electrode 12 is disposed through this photoconductive layer and a spacer, and image exposure is performed while applying a voltage between the electrode layer 22 and the transparent electrode 12, the light of the insulating layer 23 is An electrostatic image can be formed at the interface with the conductor 113. Even in such an image recording method, by integrally forming the spacer 30 on the photoconductive layer 13, it is possible to prevent discharge breakdown due to adhesion of dust or the like.

[Function 2] By integrally forming a spacer on the photoconductive layer, the present invention allows the photoconductive layer of the photoreceptor and the charge holding medium, or the photosensitive layer laminated on the insulating layer and the transparent electrode layer to face each other in a non-contact manner. When performing voltage exposure, it is necessary to insert a separate spacer, which eliminates the problem of dust adhesion.
). Further, by providing a spacer in a portion (where no electrode layer is formed), discharge damage through the spacer can be prevented, and stable image formation can be performed.

〔Example〕

Examples will be described below.

[Example 1] Glass substrate (Corning Co., Ltd. 7059 glass, 45×50
．． 1.1t) After masking the central part 35 x 45 coated with negative photoresist, exposed and developed,
Only the central part of the glass was exposed. Thereafter, the glass was etched with hydrofluoric acid to a depth of 10 μm.

Thereafter, the resist was removed, and using this as a substrate, a transparent electrode layer and a photosensitive layer were formed to form a photoreceptor.

[Example 2] In Example 1, a transparent electrode was directly formed without removing the negative resist, and then the resist was removed together with the transparent electrode on the resist, and then a photosensitive layer was formed.

[Example 3] In Example 1, etching was performed in 30 μm lines), and then a transparent electrode layer and a 20 μm thick photosensitive layer were formed. The surface was coated with a positive resist, and using the same mask pattern as in Example 1, exposure and development was carried out to etch the photosensitive layer and transparent electrode layer up to the glass surface at the periphery.

[Example 4] A glass substrate provided with a transparent electrode layer on the surface was used as a base material, and an insulating paste was printed in a pattern by a screen printing method, and then dried and fired to a height of 30 μm. Thereafter, a photosensitive layer was formed on the parts other than the insulator part, and the photoreceptor was completed. The same process was applied.

In this case, there was no need for the screen printing paste to be insulating.

Example 6 A transparent electrode 1 and a photosensitive layer were sequentially laminated on two glasses, and an insulating paste was screen-printed in a pattern to form a photosensitive layer.

2. Effects of Opening As mentioned above, according to the present invention, there is no need to insert a separate spacer between the photoreceptor and the charge holding medium, which makes the work easier and eliminates dust etc. between the spacer and the photosensitive layer. By forming the electrode layer in a pattern and providing spacers in areas where no electrode layer is formed, it is possible to prevent discharge damage through the spacer. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the present invention, FIGS. 2 to 5 are diagrams showing modifications of the present invention, and FIG. 6 is a diagram showing electrostatic image recording by forming a photoconductive layer on an insulating layer. FIG. 7 is a diagram showing an example of such a method, and is a diagram for explaining a conventional image recording method. DESCRIPTION OF SYMBOLS 10... Photoreceptor, 11... Substrate, 12... Electrode layer, 1
3. Photoconductive layer, 20. Charge retention medium, 21. Substrate, 22. Electrode layer, 23. Insulating layer, 30. Spacer. Applicant Dai Nippon Printing Co., Ltd. Agent Patent attorney Masanobu Hirukawa (7 others) Figure 4 Figure 5 Figure 2 Figure 6 Figure 1

Claims (7)

[Claims] (1) A spacer-type photoreceptor comprising an electrode layer and a photoconductive layer sequentially laminated on a substrate, wherein a patterned spacer is formed on the photoconductive layer. (2) In a photoreceptor in which an electrode layer and a photoconductive layer are sequentially laminated on a substrate, the electrodes are formed in a pattern, the photoconductive layer is uniformly laminated, and a photoconductive layer without an electrode layer is formed. A spacer-integrated photoreceptor characterized by having a spacer formed on a layer. (3) In a photoreceptor in which an electrode layer and a photoconductive layer are sequentially laminated on a substrate, the electrode layer is formed in a pattern, and
A spacer is formed in a portion where an electrode layer is not formed, and a photoconductive layer is further formed on the patterned electrode layer with a thickness smaller than that of the spacer, excluding the spacer portion. Gap integrated photoconductor. (4) In a photoreceptor in which an electrode layer and a photoconductive layer are sequentially laminated on a substrate, the electrode layer is uniformly formed on the substrate, and
A spacer-type photoreceptor characterized in that a patterned spacer is formed on an electrode layer, and a photoconductive layer is uniformly laminated on the electrode layer on which no spacer is formed, with a thickness smaller than that of the spacer. . (5) In a photoreceptor in which an electrode layer and a photoconductive layer are sequentially laminated on a substrate, the electrode layer and the photoconductive layer are laminated in a recess formed in the substrate, and the laminated film thickness of the electrode layer and photoconductive layer is 1. A spacer-integrated photoreceptor, characterized in that the depth of the spacer-integrated photoreceptor is smaller than the depth of the recess, and a portion of the substrate other than the recess is used as a spacer. (6) A spacer-integrated photoreceptor, characterized in that an electrode layer, an insulating layer, and a photoconductive layer are sequentially laminated on a substrate, and a patterned spacer is formed on the photoconductive layer. (7) The spacer-integrated photoreceptor according to any one of claims 1 to 6, wherein the spacer is made of an organic insulating material or an inorganic insulating material.