JPS6146959A - Image recording method - Google Patents

Abstract

PURPOSE:To prevent the variance of density of interference fringes to obtain vivid recorded images by placing a coherent light absorber in the position where a coherent light is transmitted through a photosensitive body where an electric charge generating layer and an electric charge migration layer are laminated. CONSTITUTION:A coherent light absorber 5 is provided in the position where the coherent light is transmitted through the photosensitive body where an electric charge generating layer 3 and an electric charge migration layer 4 are laminated on a transparent conductive supporting body 1. Since the coherent light made incident on a photosensitive layer is transmitted through the supporting body 1, the quantity of light reflected on the boundary surface between the surface of the supporting body and the electric charge generating layer 3 is reduced, and the variance of density of interference fringes due to a large quantity of reflected light is prevented; and since the absorber 5 is provided in the coherent light transmission position, influences of irradiated to the other parts of the photosensitive body upon image formation are prevented to obtain vivid recorded images.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image recording method, and more particularly to an image recording method in which an image is recorded on an electrophotographic photoreceptor using coherent light.

Disaster strikes! An image recording method in which an image is recorded on an electrophotographic photoreceptor using coherent light such as a laser beam is known, and the electrophotographic photoreceptor used in such a method has conventionally been made of selenium, selenium-based alloys, and polyvinyl cambazole. Charge transfer complexes of trinitrofluorenone and trinitrofluorenone have been used.

On the other hand, as an electrophotographic photoreceptor, a laminated photoreceptor having a photosensitive layer in which a charge generation layer and a charge transfer layer are laminated on a conductive support is attracting attention. The charge generation layer in this laminated photoreceptor has a function of absorbing light and generating charges, and has a thickness of about 0.1 to 1 μm. The charge transfer layer has a rate of transporting the charges generated in the charge generation layer and hardly absorbs image forming light, and has a thickness of about 5 .mu.m to 30 .mu.m. As the conductive support, a material such as aluminum or stainless steel or a thin layer of aluminum or nickel formed on a plastic sheet by evaporation or the like is used.

When an image is recorded on such a photoreceptor using laser light, which is coherent light.

Closely spaced line image area, halftone image area,
Or, interference fringe-like density unevenness occurs in the solid image area.

This is because the light incident on the photoreceptor is further reflected at the interface between the charge generation layer and the monoelectric support, which causes multiple reflections within the photosensitive layer, and the interference of the multiple reflections creates bright and dark areas. considered to be a thing.

■-This invention improves the upper air defect and prevents the occurrence of density unevenness in the form of interference fringes when recording an image on a laminated electrophotographic photoreceptor using coherent light, resulting in a clear recorded image. The purpose is to provide an image recording method that allows

1- A method of recording an image by irradiating coherent light as image writing light onto an electrophotographic photoreceptor having a photosensitive layer in which a charge generation layer and a charge transfer layer are laminated on a transparent conductive support, An image recording method characterized by placing a coherent light absorber at a position where coherent light passes through an electrophotographic photoreceptor.

In the photoreceptor used in the present invention, a charge generation layer is formed by depositing or coating a charge generation substance alone or in a mixture with a polymer on a transparent conductive support, and a charge transfer substance is deposited on this charge generation layer. The charge transfer layer can be formed by applying a polymer solution containing the charge transfer layer.

Examples of the charge generating substance include JP-A-53-133445, JP-A-53-95033, and JP-A-54-22.
Disazo pigments described in JP-A No. 834, trisazo pigments described in JP-A No. 53-132347, or known charge-generating substances such as Diane Blue and Chlordiane Blue, as well as charge transfer substances. .

Known charge transfer substances such as oxadiazole derivatives, pyrazoline derivatives, and hydrazone derivatives are used.

Resins used for the charge generation layer include polyester,
Examples of the resin used for the charge transfer layer include polyvinyl butyral, polycarbonate, polyester, and the like.

The transparent conductive support used is a transparent film such as a polyester film on which aluminum, nickel, indium oxide, or the like is vapor-deposited or sputtered.

In the present invention, the coherent light absorber is a material obtained by mixing and dispersing or mixing and dissolving a pigment or dye that absorbs coherent light, such as carbon black or cyanine dye, in a resin and coating it on a suitable support. is used.

The coherent light absorber may be formed as a coating on the opposite side of the transparent conductive support to the surface having the charge generation layer, or may be provided as a separate member at a position where coherent light passes through the electrophotographic photoreceptor.

According to the image recording method of the present invention, since the coherent light incident on the photosensitive layer is transmitted through the transparent conductive support, it is possible to reduce the amount of light reflected at the interface between the conductive support surface and the charge generation layer. Since the amount of light contributing to reflection is reduced,
It is possible to prevent density unevenness due to interference stitches due to a large amount of reflection.

Further, since a coherent light absorber is provided at a position through which the coherent light is transmitted, it is possible to prevent the transmitted coherent light from irradiating other parts of the photoreceptor and affect image formation.

The present invention will be explained below with reference to Examples.

Example 1 1 to 1 part of lisazo pigment of the following structural formula (1).

5. Thoroughly grind 19 parts by weight of cyclohexanone and 5 parts by weight of polyvinyl butyral resin/6 parts by weight of cycloohexanone solution in a ball mill. Add to this cycloxanone 10
It was diluted by adding 4 parts by weight. The above liquid mixture was applied onto a polyester film on which aluminum was vapor-deposited so that the transmittance of semiconductor laser light was 60% to form a charge generation layer.

On the charge generation layer, 10 parts by weight of a hydrazone compound represented by the following structural formula (2), 10 parts by weight of polymer solution-1/resin,
An electrophotographic photoreceptor was prepared by applying a solution of 0.002 ffi silicone oil and 80 parts by weight of tetrahydrofuran to form a charge transfer layer.

Next, a dispersion of carbon black dispersed in a resin was applied to the back surface of the electrophotographic photoreceptor to form a laser light absorber.

When this photoreceptor was installed in an experimental laser printer equipped with a semiconductor laser (charged with negative polarity) and an image was produced, no interference fringe-like density unevenness was observed in the solid image area or line image area. .

Aluminum film thickness 0.6μ on polyester film
An electrophotographic photoreceptor was prepared in the same manner as in Example 1 above, except that the conductive support was black-stoned (the transmittance of this conductive support to semiconductor laser light was 1%), and an image was formed in the same manner as above. As a result, density unevenness in the form of interference fringes was observed in the solid image area and line image area.

Formula (1) Formula (2) Example (2) In Example 1, an electrophotographic photoreceptor without a laser light absorber coated on the back side of the electrophotographic photoreceptor was used to form a belt-shaped photoreceptor as shown in FIG. It was installed in an experimental laser printer equipped with a semiconductor laser, and a laser light absorber coated with a dispersion of carbon black in resin was coated on an aluminum plate at a point where the laser light could pass through the belt-shaped photoreceptor. When images were produced, the same results as in Example 1 were obtained.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are explanatory diagrams showing one embodiment of the present invention. 1...Support 2. Conductive layer 3... Charge generation layer 4・Charge transfer store 5. Laser light absorber 6... Belt-shaped photoreceptor 7. Bell-shaped photoreceptor guide roller 8 Laser light 9. Laser light absorber

Claims (1)

[Claims] In a method of recording an image by irradiating coherent light as image writing light onto an electrophotographic photoreceptor having a photosensitive layer in which a charge generation layer and a charge transfer layer are laminated on a transparent conductive support, the coherent light An image recording method characterized by placing a coherent light absorber at a position where it passes through a photographic photoreceptor.