JPS58171057A - Electrophotographic recording material for monocolor light source - 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 provides a particularly narrow spectrum optical system for recording with monochromatic light, consisting of a conductive layer support and a photoconductive layer and optionally a charging support transport layer and optionally a covering layer. The present invention relates to electrophotographic recording materials for recording with bandwidth radar radiation.

In radar printing systems, the information that is stored, processed or transmitted electronically is preferably printed by an electrophotographic device. Gaseous as well as solid lasers are used for this purpose.

Solid state radar 1, for example, gallium aluminum arsenide (Ga
Solid-state radars based on AlAs have various advantages over gaseous radars. In the case of solid-state lasers, the light emission can thus be directly modulated via a diode current, and solid-state lasers generally have small structural dimensions. Furthermore, it is characterized by extremely low costs due to its large scale mass production.
Gas lasers and their modulators are expensive. For these reasons, it goes without saying that efforts are being made to utilize solid-state lasers advantageously.

However, in the case of solid-state radar, the radar is approximately 76 D
The disadvantage of the sub-nm spectral distribution is that many photoconductors normally used in electrophotography still only emit in the range with very little absorption and correspondingly little photosensitivity. has. Although this slight photosensitivity is partially compensated for by the high intensity of the light beam, the slight absorption is due to the fact that the light beam passes mostly through the photoconductive layer and the charged support transport layer, and the layer support Another drawback is that it reaches the body and reflects off its surfaces. Since the bandwidth of a laser beam is extremely narrow, the incident and reflected light will interfere with each other as long as the coherent length is sufficient. As a result, a structure corresponding to the interference occurs in the latent charged image produced by the radiation on the electrophotographic recording material, which then becomes observable in the developed image when the potential difference reaches a developable value. This bridge interference structure is not only a nuisance but also a nuisance if it appears in the printed image, and is therefore undesirable.

Interference structures are used to improve radar performance in relation to optical path differences.
This phenomenon becomes more pronounced as the coherent length of light increases. This therefore occurs primarily in the case of Radey diodes, which have a very narrow spectral bandwidth of light emission.

The problem of the present invention is that when recording electrophotographically with monochromatic light,
The purpose is to prevent the generation of interference structures that would damage the printed image, especially when recording with laser beams. This task is achieved according to the invention by a particularly narrow spectral bandwidth for recording with monochromatic light, consisting of an electrically conductive layer support and a photoconductive layer and optionally a charging support transport layer and optionally a covering layer. In electrophotographic recording materials for single-beam recording, the recording material comprises one or more photoconductive layers, a charging support transport layer optionally present with stripes, and optionally a covering layer and a conductive layer support. The solution is to include an intermediate layer between the body and the body, which absorbs the part of the incident light that is not absorbed in the optical path before it hits the layer support.

Advantageously, the intermediate layer consists of one or more metals selected from metal, gallium, indium, thallium, tin, lead or manganese. middle class.

The layer thickness is 10...2000 nm, preferably 10...
-50 nm.

A further solution to the problem set forth according to the invention consists in that the surface of the electrically conductive layer support, which has a further ρ layer on its surface, is roughened, the roughness depth being preferably 0. 5-50
It is am.

The two solutions of the invention reduce the component of the incident light quantity that passes unabsorbed by the layer carrying the photoconductive and charged support until there is no longer any interference between the incident light and the reflected light, or at least , it can be absorbed so significantly that it no longer causes damage to the printed image, or it can be scattered from the surface of the roughened layer support.

A particularly high efficiency of the measures described above is obtained by combining the two measures and by using them simultaneously, each of the two measures being used with little deviation from each other.

This fact also facilitates its use. That is, in this case, a very thin intermediate layer can be easily provided and the roughening time thereof is short. At the same time, undesirable effects on the electrophotographic properties of the recording material can be prevented.

Next, the electrophotographic recording material according to the present invention will be described in detail with reference to partially schematic drawings.

Conductive layer support 1, for example an aluminum plate or r
On the ram, a layer of tellurium, for example, with a thickness of 50 to 100
Arsenic selenide (As2Se3
) is present. Arsenic selenide is a mechanically and thermally extremely stable material, guaranteeing a long service life.

The photosensitivity of As2Se3-photoconductors decreases gradually from wavelengths of 720 nm to longer wavelengths;
Its sensitivity in the spectral range of 0 to 820 nm is such that the recording material initially charged to about 800 V has an illuminance of 1 to 4 μJ/C.
It is high enough to be discharged to 400V when projected with llI2. Because high-powered radar diodes provide this type of illumination, the contrast potential created by laser exposure is high between exposed and unexposed areas, even though the sensitivity of the photoconductor is negligible. is sufficient,
To ensure the production of high-quality printed images.

As in the above spectral range of 760...820 nm
2Se3 still has a slight absorption of incident light. That is, for example, when a photoconductive layer with a typical layer thickness of 60 μm is irradiated with light at a wavelength of 780 nm, 40% of the incident light is absorbed, and when the wavelength is 800 nm, 30% and 8
At 20 nm, 24% is absorbed.

If the measures according to the invention are not implemented, the unabsorbed portion of the incident light is reflected at the surface of the layer support and causes interference which enters the printed image as disturbing line structures. Printing 1
The interference in the image and its undesired effects become more pronounced as the spectral half-width of the Radey diode used becomes smaller.

However, these drawbacks can be overcome according to the invention by the electrically conductive layer support 1
When an intermediate layer 2 that absorbs light of the wavelength used is present between the photoconductive layer 3 and the photoconductive layer 3, and/or the surface 4 of the conductive layer support is roughened (roughness depth 1 to 2 μm). can be excluded.

The measures according to the invention are applicable both in the case of single-layer and multilayer photoconductors and also in the case of multilayer systems consisting of a photoconductive body and a sleeping support carrier layer and optionally a covering layer; for example, Se
Te, As2Se31As2se3-xTex(x
=0.01~0.5) or As2-2Bixse3(
x-=0.01-0.1) and a photoconductive layer consisting of Se
Alternatively, it can be advantageously used in the case of a charged carrier transport layer consisting of As2Se3. In these cases, printed images of excellent quality are produced which are free of damage line structures due to interference.

[Brief explanation of the drawing]

The drawing is a partial schematic illustration of an electrophotographic recording material according to the invention.

Claims (1)

[Claims] 1. A particularly narrow spectral bandwidth for recording with monochromatic light, consisting of a conductive layer support and a photoconductive layer and optionally a charging support transport layer and optionally a covering layer. In electrophotographic recording materials for recording with radar radiation, the recording material comprises one or more photoconductive layers, an optionally present charging support, a transport layer and optionally a covering layer and an electrically conductive layer support. A Nariko photographic recording material for a monochromatic light source, characterized in that it comprises an intermediate layer between the two and the intermediate layer which absorbs the part of the incident light that is not absorbed in the optical path before it hits the layer support. 2. The electrophotographic recording material according to claim 1, wherein the intermediate layer is made of one or more of cadmium, gallium, indium, thallium, tin, lead, tellurium, or manganese metal. 3. The electrophotographic recording material according to claim 1 or 2, wherein the intermediate layer has a layer thickness of 10...20 D Onm. 4. The electrophotographic recording material according to any one of claims 1 to 6, wherein the intermediate layer has a layer thickness of 10 to 50 nm. 5. For recording with monochromatic light, consisting of a conductive layer support and a photoconductive layer and optionally a charging support transport layer and optionally a coating layer, for recording with radar radiation of a particularly narrow sincere vector bandwidth. 1. An electrophotographic recording material for use in electrophotography, characterized in that the surface of a conductive layer support on which another layer is formed is roughened. 6. The roughness depth of the surface of the conductive layer support is 0.5 to 5°0.
The electrophotographic recording material according to claim 5, which has a diameter of μm. Z for recording with monochromatic light, in particular for recording with radar radiation of a narrow spectral bandwidth, consisting of a conductive layer support and a photoconductive layer and optionally a charging support transport layer and optionally a covering layer In an electrophotographic recording material, the recording material is arranged in the optical path between one or more photoconductive layers, an optionally present charging support transport layer, an optionally present covering layer and an electrically conductive layer support. characterized in that the surface of the conductive support is roughened, comprising one intermediate layer that absorbs the unabsorbed portion of the incident light before it hits the layer support, and having another layer on its surface. , electrophotographic recording material.