JPS5962866A - Photoreceptor for electrophotography - Google Patents

Abstract

PURPOSE:To improve the follow-up ability of the temp. of a substrate under vacuum deposition to the temp. of a mandrel and to decrease the variance in the substrate temp. and the variance in the film thickness of a photosensitive layer of selenium-arsenic or the like in a selenium photoreceptor for electrophotography wherein said photosensitive layer is deposited by evaporation on the surface of a substrate, i.e., aluminum blank pipe, by subjecting the inside wall of the aluminum blank pipe to a treatment for improving emissivity. CONSTITUTION:A photosensitive layer of selenium-arsenic or the like is deposited by evaporation on the surface of an aluminum blank pipe 2 which is a substrate in a photoreceptor for electrophotography having a photosensitive layer consisting of a selenium-arsenic alloy used in a high-speed non-impact printer or an electrostatic type copying machine for plain paper. The pipe 2 of which the inside wall is subjected to a treatment for improving the emissivity is used. The mentioned treatment is preferably colored to a blakish color. The above-mentioned aluminum blank pipe 2 is subjected preferably to roughening so as to have 1-10mu surface roughness on the inside wall or is formed with grooves 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a high-speed non-impact 7
This refers to an electrophotographic photoreceptor having a photosensitive layer made of a selenium-arsenic alloy, etc., which is used in 'linters' or '+'jD'iL9 type plain paper copying machines.

In order to use it in high-speed non-impact printers, it is required to have high sensitivity of 1f\'1, high printing durability or stable T property, and in the case of laser printers, it is necessary to improve sensitivity on the long wavelength side. These requirements cannot be met with a photosensitive layer made of pure selenium or a selenium-tellurium alloy, but a photosensitive layer made of a selenium-arsenic alloy, for example AS2SA3, is used.

However, in order to deposit the AS2 Sea photosensitive layer (7) to obtain a smooth deposition surface without leaving any finishing marks on the substrate surface, the substrate temperature must be raised to a high temperature of 200° C. or higher.

On the other hand, when performing the evaporation work of AS2Se3 in a vacuum without convection, it is said to be quite difficult to precisely control the substrate temperature at around 200°C.

If there are variations in the substrate temperature during vapor deposition, there may be a local imbalance in the thickness of the alloy layer 1. When such a photoreceptor is charged, the charging state will differ locally, This appears as density unevenness during printing.

A vacuum evaporation apparatus as shown in FIG. 1 is not used as an equipment for performing this yuzu evaporation work.

Here, X is a vacuum deposition chamber, l is a mandrel, 2 is a substrate, and 3
is the evaporation source, 4 is the temperature rating, and 5 is the oil circulation route. In this apparatus, the substrate 2 is generally heated by circulating oil heated at a high temperature within the mandrel 1 in order to control the temperature of the substrate 2 to around 200'C. ,′/J:
In this case, the mandrel 1 is a general structural carbon copper steel pipe, and the needle surface is plated with about 6 μm of chrome. The base aluminum tube 2 is a cold-drawn tube, the surface of which is appropriately roughened, and the inner surface left untreated. In this case, the clearance between the mandrel 1 and the substrate 2 is approximately 0.5 mm on one side. With this device A
The process for vapor deposition of S2S (!□) in a high vacuum is as follows. One cooled mandrel 1 is
The evaporation υ′J
+ 3 was filled with A S 2863 alloy, evacuated, and heated to A 32 with the temperature program shown in Figure 2.
Evaporation of S e3 is performed. Referring to Figure 2, A is the mandrel set temperature, B is the heat transfer rate from the mandrel, %4IJj,
The resulting temperature of the aluminum tube, C is the degree of vacuum in the vacuum deposition chamber, and (■) is 11 degrees below the evaporation level.

Disadvantages of vapor deposition using the above method
, the temperature rise of the aluminum tube 2, which is 15 bodies, is b':<,z
oo minutes, and the temperature rise is 1F [there is variation in the rise value, and it is ±10'C in the case of a set temperature of 20 (/'C)1.These problems are indirectly caused by the manufacturing process. In addition to significantly reducing the number of prints, variations in the temperature rise value cause variations in the film thickness of the photoreceptor, causing a decrease in yield, and furthermore, extremely low printing performance in terms of quality.

Therefore, the present invention eliminates the drawbacks of the conventional photoreceptor as described above, and improves sensitivity and printing durability by using ASzS.
To provide an electrophotographic photoreceptor that is inexpensive and has particularly excellent printing performance in terms of quality by making use of the characteristics of an es alloy, shortening the manufacturing process, and reducing film thickness variations to improve manufacturing yield. With the goal.

Bearing in mind that heat transfer in a vacuum is mainly caused by the Buddha's mind and radiation, the inventor studied ways to improve the emissivity in the vacuum deposition chamber, and increased the emissivity of the aluminum tube that serves as the base. It has been found that by performing a treatment to improve the 61□J, Ji/' fluctuation of the aluminum tube during vapor deposition, it is possible to reduce the above-mentioned objective (achieved).

Therefore, the present invention provides a selenium photoreceptor for electrophotography in which a photosensitive layer such as selenium/arsenic thread is deposited on the surface of a base aluminum tube, and the inner wall of the aluminum tube is subjected to emissivity improvement treatment. It relates to the electrophotographic monthly 1st selenium sensor, which is characterized by the use of 7 bodies.

According to the present invention, the radiation 7 of aluminum 7G is +#t
One of the treatments that can be used to improve the performance is to color the inner wall of the aluminum tube a blackish color. Coloring like this (2) fl+
1 and 12 degrees, hard alumite treatment on the inner wall 75 degrees.

In this case, sulfuric acid low-temperature alumite of 75 mm is preferable, and the thickness of the alumite is preferably around 2,071 mm. Soft alumite treatment on the inner wall (coloring with organic dye in this case)
4.4-color Ni plating, black Cr plating, AC electrolytic coloring,
Coloring with fish body paint can also be done in the same way.

Another emissivity improvement treatment is to increase the surface area of the inner wall of the aluminum tube. As a method for this, it is preferable to use sandblasting or the like to widen the Vt surface.

In this case, the surface degree A' is preferably 1 to 10/1.

1. Surface roughening by alkali etching can also be used. 3. Furthermore, the surface area of the inner wall can be increased by forming a plurality of grooves on the inner wall when the aluminum wood pipe is drawn. In this case, 1v of meat is required to be 2.5 mm at the narrowest part.

Another emissivity improvement treatment includes a method of bonding a metal with a high emissivity to the inner wall of an aluminum tube. For example, the emissivity can be improved by attaching a roughened and blackened stainless steel foil to the inner wall of an aluminum tube.

However, you can aim for a compound effect by combining some of the above treatments. One of these methods is to apply black coloring such as black alumite to the MAL surfaced inner wall surface of the aluminum tube.

Due to the emissivity improvement treatment according to the present invention, the temperature of the substrate during vacuum evaporation of the photosensitive layer (V) has an extremely good ability to follow the temperature of the mandrel, and the variation in substrate temperature is reduced, resulting in photosensitive This reduces variations in the thickness of the layers. As a result, the number of man-hours per photoreceptor is considerably reduced, the film thickness yield is improved, and the effect on energy consumption is also significantly increased.

The above describes a photoreceptor with a high-temperature selenium/arsenic thread vapor-deposited photosensitive layer. Needless to say, it can also be applied to selenium photoreceptors.

The present invention will be explained below using examples.

Example 1 Hard black alumite was applied from a sulfuric acid bath to the inner wall of an aluminum tube manufactured by low-temperature drawing. The thickness of the alumite was 20μ. Insert the mandrel l of the vacuum fish landing chamber An increase of 7 degrees in 2 was measured.

The resulting force, 11 pieces, is reduced to Figure 3. Here, ′P]t
yo mandrel's hot j marukami game 4° ``cogram, F
is the ji+A degree of the aluminum tube.

As shown in Fig. 1, the black alumite-treated aluminum tube has extremely good follow-up performance to the mandrel temperature L, and compared to the set temperature Re of the mandrel, conventional
The t rate of 9056 has been improved to 95%, and the t rate of 111], which used to take 200 minutes, has now been laid down in 6υ minutes. In addition, the temperature variation was conventionally large at 200 °C, but with the alumite coloring, the temperature was reduced to 2.5 °C at 200 °C.

In other words, the man-hour required for one book was reduced by 140 minutes, and
'l, i/ is m2Cj1^・thick and has a significant effect on energy consumption.

Example 2 An aluminum blank tube 2 having grooves 2a formed on its inner wall surface as shown in FIG. 14 was produced by cold drawing.

In addition, the inner wall surface of the sia aluminum tube 2 was sandblasted.
The surface was roughened to a surface roughness of ~5μ.

The two aluminum tubes described above were heated to -771° as in Example 1, and results similar to the temperature curve shown in FIG. 3 were obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a vacuum evaporation apparatus for a selenium photoreceptor. Fig. 2 is a graph showing the temperature at which some parts of the vacuum evaporation apparatus according to the 4''E technique are applied. Figure 4 is a graph showing the temperature.
There are drawings. ■...Mandrel, 2...Base (aluminum raw tube), 2
a =・r+i; , ” ”'? N't
MV'X, 4...Nhei,? 'llll
4'!ノ, 5...Oil circulation monkey route, X...Vacuum deposition chamber. ! 1-J♂"Exit 11+:l'1 person Fuji'ia Machine Manufacturing Co., Ltd.□--(Ij, 1
6th note 3rd "7"" Self-procedural amendment (Rikimin) Showa I?S Month/Name Japan Patent Office Commissioner Kosugi Tokoo Fire Tono ■, Indication of case 'Showapu 7th year Patent Application No. 175 Tatata No. 3, What is the relationship between the person making the amendment and the case? Patent applicant
) Fuji Electric Manufacturing Co., Ltd.

Claims (4)

[Claims] (1) In a selenium photoreceptor for electrophotography, which is made by depositing a photosensitive layer of selenium, arsenic thread, etc. on the surface of a base aluminum tube, the inner wall of the aluminum tube is treated to improve emissivity. A selenium photoreceptor for electrophotography, characterized in that the selenium photoreceptor is used for electrophotography. (2) Special fFM? A selenium photoreceptor according to Item 1, characterized in that an aluminum tube whose inner wall is colored black is used. (3) The selenium photoreceptor according to claim 1, characterized in that an aluminum ring whose inner wall is roughened to have a surface roughness of 1 to 10 μm is used. Selenium photoreceptor. (4) A selenium photoreceptor according to claim 1, characterized in that an aluminum tube having grooves formed in its inner wall during pultrusion molding is used.