JP3078531B2 - Photoreceptor manufacturing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photosensitive member,
For more details, see
Photoreceptor suitable for photo printer and its image forming method
It is about. 2. Description of the Related Art Heretofore, a laser beam has been line-scanned.
Electrophotographic printers use helicopters as laser beams.
Um-cadmium laser, argon laser and helium-
Gas lasers with relatively short wavelengths such as neon lasers are used.
And the thickness of the electrophotographic photoreceptor used for it
CdS-binder based photosensitive layer forming photosensitive layer, charge transfer
Complex (IBM Journal of the Res)
each and Development-ment, 197
January, January, P.M. 75-P. 89) was used
The laser beam can cause multiple reflections in the photosensitive layer.
Therefore, an interference fringe pattern image actually appears during image formation.
I was not told. [0003] However, instead of the gas laser described above, a device is used.
In recent years, in order to reduce the size and cost of
Semiconductor lasers have come to be used. This semiconductor
Lasers typically oscillate in the long wavelength region of 750 nm or more.
It has a high sensitivity in the long wavelength region.
Electrophotographic photoreceptor is required,
Photoreceptors have been developed. [0004] Conventionally known long-wavelength light (for example, 6
(00 nm or more)
Copper phthalocyanine, aluminum chloride phthalocyanine
Charge generation layer containing phthalocyanine pigment such as nin
Electrophotographic photoreceptor having a laminated structure of a photoconductor and a charge transport layer
Or electrophotography using a selenium-tellurium film
The body is known. [0005] Such long-wavelength light is not
Laser beam scanning electronic imaging of photoreceptor
Attach to a true printer and perform laser beam exposure
The interference fringe pattern appears on the formed toner image.
There was a drawback that a good reproduced image could not be formed. This reason
One of the reasons is, for example, that a long wavelength laser is
Not completely absorbed, the transmitted light is specularly reflected on the substrate surface,
This causes multiple reflections of the laser beam in the photosensitive layer,
This may cause interference with the reflected light on the photosensitive layer surface.
It has been attributed. As a method of resolving this drawback,
The surface of the conductive substrate used in the electrophotographic photoreceptor with the anode
A method of roughening by oxidation or sandblasting, etc.
Use a light absorbing layer or anti-reflection layer between the photosensitive layer and the substrate
To eliminate multiple reflections in the photosensitive layer
Has been proposed, but as a practical matter
Interference fringes that sometimes appear can be completely eliminated
It was not something. In particular, the surface of the conductive substrate is roughened.
Is difficult to form a rough surface with uniform roughness
A relatively large roughness may be formed at a relatively high rate. this
For this reason, this large roughness part corresponds to the carrier injection part in the photosensitive layer.
Acts as a white spot (or reversal development method) during image formation.
When the formula is used, it appears as a black dot)
This was not the preferred method. And the same in manufacturing
Difficult to manufacture conductive substrate with uniform rough surface in lot
There are many points to be improved. Light absorption layer
Or sufficient interference with methods using anti-reflection layers
Stripes cannot be eliminated, and production costs are low
It has drawbacks such as rising. [0007] An object of the present invention is to provide a new solution to the above-mentioned disadvantages.
Regular photoreceptors (eg, electrophotographic photoreceptors) and their image forms
It is to provide a law. Another object of the present invention is to make it easy to manufacture,
Facilitates conductive substrates with uniform surface properties within the same lot
To provide a method for manufacturing electrophotographic photoreceptors
To provide. [0009] Such an object of the present invention is as follows.
In a photoreceptor provided with a coating layer having a photosensitive layer on a substrate
The thickness of the coating layer varies regularly between the minute widths of the coating layer.
The regular change in film thickness
Is the surface of the cylindrical substrate as shown in FIGS.
Consecutive concave portions, i.e., grooves, of minute width in the circumferential direction
The cross section of each groove along the micro-width direction becomes a regular shape.
Achieved by the photoreceptor being formed by
Is done. Preferably, the groove on the surface of the cylindrical substrate is a minute width of the groove.
Along with λ / 2 (λ; wavelength at the time of image exposure) or more (preferably
Is 0.1 μm to 100 μm, particularly preferably 0.3 μm
-30 μm) is formed.
Is achieved by a photoreceptor. FIG. 1 shows a conductive group used in the present invention.
It shows an example of the body. The conductive substrate 1 shown in FIG.
In principle, the linear projection 2 and the tapered reflecting surface 3 (for cutting line
Corresponding). Linear projection 2 and taper
The reflecting surface 3 is used when the conductive substrate 1 is a cylindrical substrate.
It can be formed in a helical shape, but other
Form a wavy shape perpendicular to the longitudinal direction of the cylindrical substrate.
And a linear projection 2 and a Taber reflection surface.
3 are simultaneously formed perpendicularly and parallel to the longitudinal direction.
be able to. FIG. 2 shows the conductive substrate 1 shown in FIG.
Represents an enlarged cross-sectional view of, for example, five linear shapes per 1 mm width.
FIG. 4 shows an embodiment in which a projection 2 and a tapered reflecting surface 3 are formed.
ing. Of course, the present invention is not limited to the above-described example,
Is 1000 μm (one linear shape per 1 mm width)
Having a projection 2) or less, preferably
10 μm (having 100 linear projections 2 per 1 mm width
) To 500 μm (two linear projections 2 per 1 mm width)
). The tapered reflecting surface 3 shown in FIG.
Cutting line formed by more regular cutting
The cross-sectional shape is a semicircular shape as shown in the figure.
Shape, or other shapes such as U-shaped
Shape, V-shape, sawtooth shape, trapezoidal shape or semi-ellipse
It can be circular. The tapered reflecting surface 3 has a taper with a height h.
However, the height h of this taper is the interference that appears during image formation.
In order to effectively eliminate the stripe pattern, λ / 2 (λ;
Or more). concrete
As described above, the height h of the taper is 100 μm or less.
It is preferable that the thickness be lower, but in particular 0.3 μm to 30 μm
It is desirable to set in the range. Taper height h
When formed to a thickness of 100 μm or more, a bar formed on the surface
It is possible that the rear layer covers most of the linear projection 2.
It is not possible to use titanium oxide with a conductive surface
Even if a conductive layer dispersed in
Is a projection corresponding to the linear projection 2 of the conductive substrate 1.
And the protrusions are sufficient for the barrier layer.
Can not be covered, so even in this case
Carrier injection into the photosensitive layer from the
The injection part appears as a white dot during image formation,
In the case of development, it appears as a black dot)
Not good. The tapered reflecting surface 3 has, for example, a semicircular shape,
Has an oval, U-shaped, V-shaped or trapezoidal cutting edge
Fixes the cutting tool to the milling machine or lathe and regulates the conductive base
Formed by a cutting process by moving
Can be In a preferred embodiment of the present invention, a radius of 0.1
The cutting tool has a semi-circular cutting edge with a pitch of 1 mm to 50 mm.
By cutting below 000 μm, as shown in FIG.
The tapered reflecting surface 3 having a rectangular shape can be formed. This
When using multiple bytes in parallel,
Manufacturing productivity by using multiple linked bytes.
Can also be increased. Also, the present invention provides a method for manufacturing
Anodizing treatment, sodium silicate, zirconium fluoride
Use a surface treatment method immersed in a solution such as potassium.
And disclosed in JP-B-47-5125.
Method, that is, alkali gold after anodizing
A method of immersion in an aqueous solution of a group silicate can also be used.
Wear. The above-described anodizing treatment method is, for example, phosphoric acid, chromium
Inorganic acids such as acid, sulfuric acid, boric acid or oxalic acid, sulfamic acid
Conductive substrate in aqueous or non-aqueous solution of organic acid such as acid
Can be carried out by passing a current as the anode
You. As the conductive substrate 1 used in the present invention,
Metals such as luminium, brass, copper, stainless steel
Aluminum, tin oxide, indium oxide
Film deposited on plastic such as tel
Can be used. FIG. 3 shows an electrophotographic photosensitive member as coherent light.
Fig. 3 schematically shows a state when a laser beam is irradiated.
You. FIG. 3A shows a case where a conventional electrophotographic photosensitive member is used.
FIG. 3B shows an example using the electrophotographic photoreceptor of the present invention.
It is. FIG. 3A shows the photosensitive layer of the electrophotographic photosensitive member.
4. Laser beam I ₁ Irradiates the surface of the photosensitive layer 4
Reflected light R ₁ And the laser beam I ₁ Is the photosensitive layer 4
Laser beam I transmitted through _Two Is on the conductive substrate 1
The light reaches the light diffusion surface 5 where the laser beam I
_Two Some of the light is diffused light K ₁ , K _Two …
But the regular light R _Two Yields
Furthermore, this regular reflection light R _Two Of the photosensitive layer 4 and the air layer
Specularly reflected at the interface, the reflected light R _Two ′ And the photosensitive layer 4 again
Will pass through. Then not shown
Reflected light R _Two ′ Are affected by the light diffusion effect of the light diffusion surface 5.
Specularly reflected light R _Three Is generated. Thus, the conductive substrate 1
Incident on the photosensitive layer 4 even if the light diffusion surface 5 is formed on
Light I ₁ Irradiates multiple reflections sequentially inside the photosensitive layer 4.
The reflected light R ₁ , R _Two , R _Three Between ...
Causes a phase difference between the wavelengths, thus causing interference
Will be. On the other hand, the embodiment shown in FIG.
Although the example of the invention is shown, the electrophotographic photoreceptor of the invention is
A tapered reflecting surface 3 is formed on a conductive substrate 1
The photosensitive layer 4 is formed on the surface. Photosensitive layer 4
Incident light I radiated toward ₁ Is part of the surface of the photosensitive layer 4
Is reflected and the reflected light R ₁ And the other part is transmitted light I _Two When
And passes through the inside of the photosensitive layer 4, and at the tapered reflecting surface 3
Specularly reflected light R _Two Is generated. This reflected light R _Two Part of
Is the reflected light R specularly reflected at the interface between the photosensitive layer 4 and the air layer. _Two ′
And the light is specularly reflected on the tapered reflecting surface 3 again. As described above, the incident light I ₁ Is in order
Multi-reflection occurs and the reflected light R ₁ , R _Two , R _Three Interference between ...
May be caused. However, according to the study of the present inventors, such
Formed on the conductive substrate 1 having the tapered reflective surface 3
After the charged photosensitive layer 4 is charged, image exposure with a laser beam is performed.
When the image was formed by sequentially applying the toner development and
The important thing is that there are no interference fringes in this image.
Turned out not to be. The reason for this is for now
Although it is inferred, the light reflected by the tapered reflecting surface 4
Interference pattern that is invisible to the eye
Turns, and the toner particles are generally 1
5 to 30 μm, relatively large particles compared to interference fringe patterns
The fine interference fringes during image formation.
It is thought that it will not appear. But here before
Of eliminating the interference fringe pattern by the aforementioned tapered reflecting surface 3
For theoretical analysis, leave it to sufficient examination and research later
Shall be. In any case, the tapered reflecting surface 3 is
4 and the conductive substrate 1
Method completely eliminates the interference fringe pattern that appeared during image formation.
It is surprising that it does not appear in
The present invention has been completed based on such a phenomenon. FIG. 4 illustrates a preferred embodiment of the present invention.
ing. The electrophotographic photosensitive member shown in FIG.
A conductive layer on a conductive substrate 1 having a tapered reflective surface 3
6, from the barrier layer 7, the charge generation layer 8 and the charge transport layer 9
The photosensitive layers 10 having a laminated structure are sequentially applied. The conductive layer 6 is made of, for example, aluminum.
Metal, tin, gold, etc.
It is possible to use a film containing dispersed conductive powder.
You. The conductive powder used in this case is aluminum
Metal, tin, silver, etc., carbon powder and titanium oxide
, Barium sulfate, metal oxides such as zinc oxide and tin oxide
And the like.
The conductive layer 6 may contain a light absorbing agent.
You. The resin in which the conductive pigment is dispersed is composed of (1) a substrate
(2) Dispersibility of powder
Is good, (3) the solvent resistance is sufficient,
Can be used as long as they meet the conditions such as
Curable rubber, polyurethane resin, epoxy resin, alk
Resin, polyester resin, silicone resin, acrylic
-Thermosetting resins such as melamine resins are preferred. Conductivity
The volume resistivity of the resin in which the pigment is dispersed is 10 ¹³ Ωcm or less,
Preferably 10 ¹² Ωcm or less is suitable. for that reason,
In the coating, the conductive pigment accounts for 10 to 60% by weight of the coating.
It is preferable that it is contained in a ratio. The conductive layer 4 includes a silicone oil and various interfaces.
Surfactants and other surface energy reducing agents
This makes it possible to obtain a uniform coating surface with small coating defects.
Can be. A method to disperse conductive powder in resin
Roll mill, pole mill, vibrating ball mill,
Using a standard method such as a lighter, sand mill, colloid mill, etc.
If the substrate is in sheet form, wire
Bar coat, blade coat, knife coat, roll coat
Suitable for printing, screen coating, etc.
In the case of the shape, a dip coating method is suitable. The conductive layer 6 generally has a thickness of 1 μm to 50 μm.
Preferably, a film having a thickness of about 5 μm to 30 μm is formed.
As a result, the height h of the projection 2 of the conductive substrate 1 is 100
In the case of μm or less, the surface defects should be sufficiently hidden.
Can be. A barrier is provided between the conductive layer 6 and the photosensitive layer 10.
A barrier layer 7 having a function and an adhesion function is provided. Barrier
Layer 7 is made of casein, polyvinyl alcohol, nitrocell
Loose, ethylene-acrylic acid copolymer, polyamide
(Nylon 6, Nylon 66, Nylon 610, copolymer
Nylon, alkoxymethylated nylon, etc.)
It can be formed by urethane, gelatin, and the like. The thickness of the barrier layer 7 is 0.1 μm to
5 microns, preferably 0.5-3 microns
Appropriate. In the present invention, the charge generation layer 8 is made of Sudan.
Red, Diane Blue, Genus Green B etc.
Zo pigment, Argol yellow, pyrenequinone, indane
Quinone face such as sllen brilliant violet RRP
Pigment, quinocyanine pigment, berylen pigment, indigo, thio
Indigo pigments such as indigo, India First Orange
Bisbenzimidazole pigments such as toner, copper phthalocyanine
Phthalocyan such as anine and aluminum chloro-phthalocyanine
Anine pigments, quinacridone pigments and Japanese Patent Application No. 57-1652
Charge generation properties selected from the azulene compounds described in No. 63
Substances can be polyester, polystyrene, polyvinylbuty
Lal, polyvinylpyrrolidone, methylcellulose,
Tying of acrylates, cellulose esters, etc.
It is formed by dispersing in an adhesive resin. Its thickness is 0.01 ~
It is about 1 μ, preferably about 0.05 to 0.5 μ. The charge transporting layer 9 has an anchor in the main chain or side chain.
Many such as thracene, pyrene, phenanthrene, coronene
Ring aromatic compounds or indole, carbazole, oxa
Sol, isoxazole, thiazole, imidazo
, Pyrazole, oxadiazole, pyrazoline, thia
Contains nitrogen-containing cyclic compounds such as diazoles and triazoles
Compounds, hydrazone compounds, etc.
It is formed by dissolving in a resin having film properties. This is a charge transfer
Generally, low-molecular-weight substances that transport substances have low film-forming properties.
Because it is scarce. Such resins include polycarbonate
Bonates, polymethacrylates, polyarelays
, Polystyrene, polyester, polysulfone, steel
Len-acrylonitrile copolymer, styrene-methac
And methyl acrylate copolymer. The thickness of the charge transport layer 9 is 5 to 20 μm.
Further, the above-described charge generation layer 8 was laminated on the charge transport layer 9.
A photosensitive layer 10 having a structure can be obtained. The above-mentioned photosensitive layer 10 has the above-described format.
For example, the above-mentioned IBM Journal
of the Research and Level
operation, January 1971, P.M. 75-P. To 89
Disclosed polyvinyl carbazole and trinitrofluor
Charge transfer complex consisting of lenone, US Pat. No. 4,431,598
No. 3 and US Pat. No. 4,327,169.
Layer using a pyrylium compound
Known inorganic light such as zinc oxide and cadmium sulfide
Photosensitive layer or selenium in which conductive material is dispersed and contained in resin,
It is also possible to use evaporated films such as selenium-tellurium
Noh. The electrophotographic photosensitive member of the present invention has a relatively long wavelength.
(For example, 750 nm or more) using a semiconductor laser.
Can be used for child photo printer, but other
Laser beam such as helium-neon laser, helium
Electricity using mu-cadmium laser, argon laser, etc.
Also suitable for child photo printers. The present invention
When coherent light such as a simple laser beam is used as the light source
The interference fringe pattern at the time of image formation
In addition to completely eliminating black spots (black spots)
Also has the advantage that it can be effectively eliminated. That is, generally, a laser beam is used.
For electrophotographic printers, after charging the electrophotographic photosensitive member
Image exposure with laser beam according to image signal
Give light (image scan exposure) to back image
Forms an electrostatic latent image, and then
Developer with toner of the same polarity as the toner
Image-wise exposure section scanned by
Reversal development system that adheres toner to the surface
However, in the case of this reversal development method, black spots appear in the formed image.
Unnecessary toner adhered. This is, as mentioned above,
Small height on rough surface formed by sandblasting
The distribution between the projections at a large height from the projections is large.
And no uniform rough surface is formed, which is unnecessarily large
Carriers are injected into the charge generation layer from the protrusions,
The carrier injected from the protruding part is charged and electrostatic
Neutralized and electrically in an image-exposed state.
This causes toner adhesion during toner development, and this
It causes black spots. On the other hand, in the electrophotographic photosensitive member of the present invention,
As mentioned above, the surface of the conductive substrate is a milling machine or
The cutting tool fixed to the lathe provides regular cutting.
Tapered reflective surface with uniform height
The carrier is formed in parallel along the direction of
There is no injection part, and even if the reversal development method
No black spots appear. This point will be described in the following embodiment.
It will be described in detail. Of course, the present invention is not limited to the above-described reversal developing method.
Various development methods such as cascade development, magnetic brush
Developing method, powder cloud developing method, jumping developing
It is also possible to adopt a method or a liquid developing method. Hereinafter, the present invention will be described with reference to examples. Example 1 60 mm in diameter and 258 mm in length of cylindrical aluminum
Push a cutting edge at one end to cut at a depth of 1.8 μm
After fixing the cutting tool to the lathe, the cylindrical aluminum
While rotating the tool, insert the cutting edge of the cutting tool into the cylindrical aluminum
Cylindrical aluminum at a feed rate of 200 μm per revolution
After moving to the other end of the
The tapered reflective surface of the cross-sectional shape shown in Fig. 2 has a pitch of 200 µm
Formed. The cylindrical aluminum machine cut in this way is
Um surface is a universal surface profiler (SE)
-3C), it was 1.8 at 200 μm width.
μm height tapered reflective surface every 200 μm pitch
It was found that they were formed regularly. Next, titanium oxide manufactured by Titanium Industry Co., Ltd.
(ECT-62) 25 parts by weight, oxidation catalyst manufactured by Sakai Industry Co., Ltd.
25 parts by weight of Tan (SR-1T) and Dainippon Ink Co., Ltd.
Phenolic resin (Plyofen J325)
Nol and methyl cellosolve (methanol / methyl cellosolve)
Lube = 4 parts by weight / 15 parts by weight)
After stirring, with 50 parts by weight of glass beads having a diameter of 1 mm
The mixture was dispersed with a sand mill for 10 hours. [0041] The dispersion was treated with Toshiba Silicone Co., Ltd.
Recon oil (SH289A) 50pp as solid content
After adding m, stir to prepare a coating solution for forming a conductive layer.
Was. This coating solution for forming a conductive layer is subjected to the aforementioned cutting process.
Film thickness after drying on the surface of the cylindrical aluminum
m, then apply at 140 ° C for 30 minutes.
By heat drying, a conductive layer was formed. Next, a copolymerized nylon resin (trade name: Amira)
CM-8000, manufactured by Toray Industries, Inc.)
Liquid mixture consisting of 60 parts by weight of butanol and 40 parts by weight of butanol
And then dip coated on the conductive layer to form a 1μ thick poly
An amide resin layer was provided. Next, ε-type copper phthalocyanine
(Rionol Blue ES, manufactured by Toyo Ink Co., Ltd.) 1 weight
Part, butyral resin (S-LEC BM-2; Sekisui Chemical
1 part by weight and 10 parts by weight of cyclohexanone
20:00 with a sand mill disperser containing mmφ glass beads
And then diluted with 20 parts by weight of methyl ethyl ketone
did. This solution is immersed on the polyamide resin layer formed earlier.
The charge generating layer was formed by dip coating and drying. The membrane at this time
The thickness was 0.3μ. Next, a hydrazone compound 1 of the following structural formula
0 parts by weight And styrene-methyl methacrylate copolymer resin (product
Name: MS200; manufactured by Iron and Steel Chemical Co., Ltd.)
Dissolved in 80 parts by weight of ene. Put this solution on the charge generation layer
And dried with hot air at 100 ° C for 1 hour.
A thick charge transport layer was formed. The electrophotographic photoreceptor prepared in this manner is discharged.
Reversal development method equipped with a semiconductor laser having a vibration wavelength of 778 nm
Laser beam printer
After loading into Linter LBP-CX (manufactured by Canon Inc.)
Then, a line scan is performed on the entire surface, and the entire surface is black toner image.
When the image was formed,
No bridging pattern had appeared. Next, the laser beam is emitted according to the character signal.
Warm the operation of in-scanning and forming characters as an image.
Repeat 2000 times at 15 ° C and 10% relative humidity
Then, the 2000th copy character image was taken out. This
Of characters with a diameter of 0.2 mm or more in the copied character image
When the number of black spots (black spots) was measured, no black spots
Could not be found. Comparative Example 1 As a comparative experiment, the electrophotographic photosensitive member of Example 1 was prepared.
Instead of the cutting method used at the time, the sand blast method
Uses a method to roughen the surface of cylindrical aluminum
Other than that, the electrophotography was performed in the same manner as in Example 1 described above.
A photoreceptor was made. In this case, the sand blast method
About the surface condition of cylindrical aluminum
Before installing the conductive layer, Kosaka Laboratory's universal surface shape measurement
(SE-3C), the average surface roughness at this time was
It was found to be 1.8 μm. This comparative electrophotographic photosensitive member was used in Example 1.
Attached to a laser beam printer
As a result, clear interference fringes were formed in the entire black image.
Had been formed. Also, in the 2000th copy character image
Is 10cm ^Two About 3 black spots with a diameter of 0.2 mm or more per hit
0 were formed, and the image was extremely difficult to see. Example 2 Fine particle zinc oxide (Sazex 200 manufactured by Sakai Chemical Co., Ltd.)
0) 10 g, acrylic resin (available from Mitsubishi Rayon Co., Ltd.)
(Ianal LR009) 4 g, toluene 10 g and the following structure
10 mg of the azurenium compound of the formula
To prepare a coating solution for a photosensitive layer. [0049] Azurenium compounds (Japanese Patent Application No. 57-165
No. 263) embedded image The film thickness of this photosensitive layer coating solution after drying is 21 μm.
And a charge generation layer and a charge transport layer used in Example 1.
Same as in Example 1 except that the photosensitive layer having the laminated structure was provided instead.
An electrophotographic photoreceptor was prepared by the method described above. This electrophotographic photosensitive member was used in Example 1.
Laser beam printer (However, so that the charge becomes positive polarity
The same measurement)
However, there was no interference fringe pattern in the entire black image,
0.2 mm or more in diameter during the 2000th character copy
No black spots were found at all, and the image was extremely good.
It turned out. Example 3 The cut cylindrical aluminum of Example 1 was prepared by a conventional method.
Anodizing to form a thin film of aluminum oxide,
Selenium-tellurium film (tellurium; 10 weight
%) With a thickness of 15 μm by a vacuum evaporation method. This electrophotographic photosensitive member was used in Example 2.
Attach it to a laser beam printer to perform similar measurements.
As a result, similar results were obtained. Example 4 60 mm in diameter and 258 mm in length of cylindrical aluminum
Push a cutting edge at one end to cut at a depth of 0.8 μm.
After fixing the cutting tool to the lathe, the cylindrical aluminum
Cutting to the other end at a feed rate of 20 μm per revolution
Processed. The cylindrical aluminum thus cut and processed
Surface is measured by Kosaka Laboratory's universal surface profiler (SE-3).
As measured by C), the width of 20 μm was 0.8 μm.
A tapered reflective surface with a height is regular every 20 μm pitch
Was formed. Example 1 was placed on this cylindrical aluminum.
Conductive layer, polyamide resin layer, charge generation layer and charge used in
An electrophotographic photosensitive member was prepared by sequentially applying a transport layer. this
Attached to the laser beam printer used in Example 1.
Thus, an image was formed in the same manner. As a result,
No interference fringes appear in the image when a color image is formed
I didn't. Also take out the 2000th character image
Observation of the presence or absence of black spots
There were no spots. Comparative Example 2 Cutting used when preparing the electrophotographic photosensitive member of Example 4
For roughening by sandblasting instead of processing
The law was adopted. The sandblasting method used at this time
The average surface roughness is 0.8μm (Kosaka Laboratory's universal table
(Measured by surface shape measuring instrument SE-3C)
Was. The roughened cylindrical aluminum
The same conductive layer, polyamide resin layer, and charge
Electrophotography for comparison by sequentially coating the generating layer and the charge transport layer
A body was prepared and an image was formed in the same manner as in Example 1.
Was. As a result, when an entire black image is formed,
It was found that a clear interference fringe pattern appeared.
When the 2000th copy character image is formed,
Image surface 10cm ^Two Black spots with a diameter of 0.2 mm or more per hit
Approximately 20 were formed. Example 5 A cylindrical aluminum having a diameter of 60 mm and a length of 258 mm was prepared.
Attached to a lathe, 1 μm long at 3 μm depth with a cutting tool
3 cutting lines per mm are formed in a spiral
While rotating the cylindrical aluminum, use the cutting edge of the cutting tool.
Cutting. Next, the cylindrical aluminum is milled.
Attached to the board, parallel to the longitudinal direction of the cylindrical aluminum
2 cutting lines per 1mm in the circumferential direction at a depth of 3μm
Was formed. This cylindrical aluminum is paired in the longitudinal direction.
With a width of 1000 / 3μm and a height of 5μm
Reflection surfaces are regularly formed at every 1000/3 μm pitch
5 μm with a width of 500 μm in the circumferential direction
m height of tapered reflective surface every 500μm pitch
It was formed regularly. Next, a conductive carbon paint (Fujikura Kasei Co., Ltd.)
100% by weight and melamine resin (Dainippon)
Ink Co., Ltd .; Super Beckamine) 50 parts by weight
It was mixed with 100 parts by weight of ruene. Cut this solution first
Apply by dip coating method on the machined aluminum cylinder
After heat curing at 150 ° C for 30 minutes, a film thickness of 4μ
m conductive layers were formed. Next, on this conductive layer, the conductive layer was used in Example 1.
Polyamide resin layer, charge generation layer and charge transport layer are sequentially provided
To produce an electrophotographic photoreceptor. This is a laser beam pump used in the first embodiment.
When a similar image was formed by attaching it to a linter,
As in Example 1, no interference fringe pattern is present in the entire black image.
Is not described, and in the 2000th copy character image
It was found that no black spots could be found. Comparative Example 3 Cylindrical aluminum subjected to cutting processing used in Example 5
Instead of using a sand blaster so that the average surface roughness is 3 μm
Except for using cylindrical aluminum treated
A comparative electrophotographic photoreceptor was prepared in the same manner as in Example 1.
Then, an image was formed. As a result, the ratio is
A slightly weaker interference fringe pattern appeared than in Comparative Example 1, and 2000
10cm in the copy text image ^Two 0.2 diameter per hit
mm or more black spots are formed at a rate of 40 or more
Was. As described above, the electrophotography of the present invention
The photoreceptor has a relatively long wavelength (for example, 750 nm or more).
In an electrophotographic printer using a conductor laser,
Uses coherent light such as a laser beam as a light source
Interference fringes during image formation that appeared with the conventional method when
In addition to being able to completely eliminate patterns, black spots (black spots)
Point) can be effectively resolved.
It is.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conductive substrate used in the present invention. FIG. 2 is an enlarged sectional view. FIG. 3A is a sectional view showing an embodiment of a conventional electrophotographic photosensitive member. b) is a cross-sectional view showing an embodiment of the electrophotographic photoreceptor of the present invention. FIG. 4 is a cross-sectional view showing another embodiment of the present invention. [Description of References] 1 conductive substrate 2 linear projection 3 tapered reflecting surface 4 , 10 photoconductive photosensitive layer 5 light diffusing surface 6 conductive layer 7 barrier layer 8 charge generation layer 9 charge transport layer

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masafumi Hisamura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hitoshi Toma 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Naoto Fujimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References JP-A-58-16297 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) G03G 5/10 G03G 5/00 101

Claims (1)

(57) [Claims] In an electrophotographic photoreceptor provided with a coating layer having a photosensitive layer on a cylindrical substrate, using a cutting tool, a tapered reflective surface having a depth of 0.3 μm to 30 μm and a width of 10 μm to 500 μm in the circumferential direction of the substrate surface. Cutting is performed regularly so that cutting lines consisting of linear projections are formed in parallel,
The method of manufacturing the photoreceptor, wherein a cross section of each of the tapered reflecting surfaces along the width direction is formed in a regular shape, whereby the thickness of the coating layer changes regularly. 2. 2. The method according to claim 1, wherein the tapered reflecting surface has a semicircular shape, a U shape, a V shape, a sawtooth shape, a trapezoidal shape, or a semielliptical shape. 3. 2. The manufacturing method according to claim 1, wherein a multiplex byte obtained by connecting a plurality of bytes in parallel is used as the byte. 4. 2. The manufacturing method according to claim 1, wherein the tapered reflecting surface and the linear projection are formed in a spiral shape. 5. 2. The manufacturing method according to claim 1, wherein the tapered reflecting surface and the linear projection are formed simultaneously in a direction perpendicular and parallel to the longitudinal direction of the cylindrical substrate.