JPH03110565A - Photosensitive body coating method - Google Patents

Abstract

PURPOSE:To obtain an excellent-smoothness coated film free of coating-streaks by nozzle-coating under the specific coating conditions. CONSTITUTION:Coating is carried out in such a manner that a supporting body 11 is rotated and coating liquid 10 is jetted out of the nozzle 14 while the nozzle 14 is moved in a direction shown by an arrow. As it does so, formula I must be satisfied, where vs is a speed at which the nozzle scans, (k) is the concentration of the solid component of the coating liquid, (w) is an amount that the coating liquid is jetted out of the nozzle, and L is the length of the circumference of the supporting body. Thus, spiral streaks does not occur on the photosensitive body, especially on the electrophotographic photosensitive body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for coating a photoreceptor, particularly an electrophotographic photoreceptor.

[Prior art]

A method of spirally coating a coating liquid onto a base material having an endlessly formed continuous circumferential surface is well known (Japanese Patent Application Laid-open No. 119651/1983).

However, since the coating is applied in a spiral manner, there is a problem in that spiral streaks occur on the coated surface.

In JP-A-60-150053, a solvent is sprayed after coating in order to erase the spiral streaks, but this method requires the use of a large amount of solvent,
In addition to problems such as collection, it takes longer to dry to the touch.
Furthermore, there is a problem in that the film thickness becomes uneven during the process of drying to the touch.

〔the purpose〕

An object of the present invention is to provide a coating method for photoreceptors, particularly electrophotographic photoreceptors, in which the spiral streaks described above do not occur.

〔composition〕

The present invention provides a method for manufacturing an electrophotographic photoreceptor in which a coating liquid is applied in a spiral manner to a support having an endlessly formed continuous circumferential surface using a nozzle. The present invention relates to a method for manufacturing a photoreceptor, characterized in that the solid concentration k of the liquid, the amount w of the coating liquid discharged from the nozzle, and the circumference RL of the support satisfy the following formula.

Lvs≦5×102kw≦1.5L v s-...(
1) However, except when both are equal signs.

(In the formula, k: Coating liquid solid content concentration (wt%) W: Coating liquid discharge amount (cc/5ec) vS: Nozzle scan speed (cm/sec) L: Support length (a
l). ) When formula (1) is not satisfied, for example, Lvs>5X 10
When using 'kw', there are parts where the coating film is not formed on the support, and when using 5 x 10sk w) 1.5L vs, the wet film thickness during coating becomes too thick, resulting in uneven film thickness and dripping of the coating solution. Such problems may occur.

The present invention will be explained with reference to the drawings.

FIG. 1 schematically shows the coating apparatus of the present invention.

In FIG. 1, the support 11 is held by a rotating shaft 13 and is rotated in the direction of the arrow by the driving force of a motor 12. In FIG.

The coating liquid 10 in the coating liquid tank 16 is pumped through a filter 18, a flexible tube 15, and a pipe 2 by a pump 17.
5, supplied to the nozzle 14 via the valve 24. The nozzle 14 is fixed to the nozzle holding member 22 at a pipe 25, and is moved in the direction of the arrow along the slide bar 23 by the motor 21 rotating the ball screw 20.

Coating is performed by rotating the support 11 and discharging the coating liquid 10 from the nozzle 14 while moving the nozzle 14 in the direction of the arrow. The coating liquid 10 is applied onto the support 11 in a spiral manner. The coating liquid position is indicated by a broken line.

FIG. 2 is an enlarged view of the nozzle of the present invention.

The coating liquid 16 is delivered to the nozzle 14 via a pipe 25 and a valve 24.
The liquid is discharged from the substrate and coated on the support 11. In this case, the cross-sectional shape of the nozzle 14 is circular, and its material is Teflon,
It is made of a material that is not attacked by the solvent of the coating liquid 10, such as stainless steel.

The coating liquid 10 is applied to the support 11 while maintaining the nozzle 14 in a cylindrical shape with an inner diameter of 8 or more. For this purpose, the peripheral speed vs of the support body 11 needs to satisfy the following equation (2).

The distance g between the tip of the nozzle 14 and the support 11 is determined by the following formula (
It is desirable to satisfy 3).

g≦□ (3) (C constant) FIG. 3 shows an enlarged view of the square nozzle 26. The coating liquid maintains the shape of the square nozzle (l'lIQ x height h) and spreads onto the support 1.
1, it is desirable that the shape of the rectangular nozzle 26 be selected so that the formula (4) (%) holds true.

The coating method of the present invention is to manufacture a single-layer electrophotographic photoreceptor by coating a coating liquid in which a charge-generating substance, a charge-transporting substance, and, if necessary, a binder resin are uniformly dispersed, on a support 11. , a laminated electrophotographic photoreceptor having a charge generation layer, a charge transport layer on the support 11, an undercoat layer between the support 11 and the charge generation layer, and a protective layer on the charge transport layer, if necessary. Applies to manufacturing.

The charge generation layer and the undercoat layer can also be manufactured by coating using a spray nozzle 27 as shown in FIG.

In FIG. 4, the discharge amount of the coating liquid 10 is controlled by adjusting the protrusion amount of the needle 28 with the needle protrusion amount adjustment knob 29 and the amount of liquid fed by the pump 17 shown in FIG. During spray coating, the needle 28 is retracted into the spray nozzle by the gas pressure from the needle operation gas introduction pipe 31, and the coating liquid 10 and the gas from the carrier gas introduction pipe 30 are atomized from the gap between the needle 28 and the nozzle section 32. It's blown out.

Next, an electrophotographic photoreceptor manufactured by the coating method of the present invention will be explained.

In the single-layer electrophotographic photoreceptor, the photosensitive layer is CdS, C
dSe, Se, inorganic photoconductive powders such as dye-sensitized ZnO, phthalocyanine, and azo pigments.

Organic pigments such as indigo pigments and perylene pigments, polyvinyl carbazole, oxazole derivatives, triphenylamine derivatives, pyrazoline, phenylhydrazones,
It is manufactured by applying a coating liquid in which a charge transporting substance such as an α-stilbene derivative and a binder resin are dispersed in a suitable organic solvent.

In a laminated electrophotographic photoreceptor comprising an undercoat layer, a charge generation layer, and a charge transport layer, the undercoat layer is made of polyamide, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, polyvinyl methyl ether, polyvinylpyrrolidone, poly-N-vinylimidazole. , thermoplastic resins such as ethyl cellulose, nitrocellulose, ethylene-acrylic acid copolymer, casein, and gelatin, thermosetting resins such as phenol, urea resin, melamine, aniline, alkyd, unsaturated polyester, and epoxy, and titanium oxide in these resins. , zinc oxide, indium oxide, antimony oxide, tin oxide, and other inorganic pigments are dispersed therein.

The solvents used here are cyclohexane, benzene,
Toluene, xylene, dichloromethane, 1,1-dichloroethane, 1,2-dichloroethane, 1,1.2-)-
Dichloroethane, 1,1,2.2-tetrachloroethane, monochlorobenzene, methanol, ethanol, butanol, methyl ethyl ketone, methyl isobutyl ketone, methyl-lowamyl ketone, methyl-n-butyl ketone, diethyl ketone, methyl-n-propyl ketone, Any material that can be applied by nozzle coating or spray coating may be used, such as cyclohexanone, methyl cellosolve, ethyl cellosolve, butyl cellosolve, ethyl acetate, butyl acetate, dioxane, and tetrahydrofuran.

The thickness of the subbing layer is 0.1 to 10 μm, preferably 0.5 to 10 μm.
It is about 5 μm.

Even if the charge generation layer is formed only from a charge generation substance,
Alternatively, the charge generating material may be uniformly dispersed in the binder. The charge generating material is therefore formed by dispersing these components in a suitable solvent, coating this also on the subbing layer, and drying.

Examples of charge-generating substances include C.I. Pigment Blue 25 [Color Index (CI) 211803, C.I. Pigment Red 41 (CI 21200), C.I. Acid Red 52 (CI 45100), C.I. Basic Red 3 (CI 45210), and porphyrin. Phthalocyanine pigments with a skeleton, azo pigments with a carbazole skeleton (Japanese Patent Application Laid-Open No. 53-9
5033), azo pigments having a stilbene skeleton (described in JP-A No. 53-138229), azo pigments having a distyrylbenzene skeleton (described in JP-A-53-138229),
33455), azo pigments having a triphenylamine skeleton (tf!, described in JP-A-53-132547), azo pigments having a dibenzothiophene skeleton (described in JP-A-54-21728) , an azo pigment having an oxadiazole skeleton (JP-A-54-12742
(described in the publication), an azo pigment with a fluorenone skeleton (
(described in JP-A-54-22834), azo pigments with a bisstilbene skeleton (described in JP-A-54-17733), azo pigments with a distyryloxadiazole skeleton (described in JP-A-54-2129) (described in the official publication), an azo pigment having a distyrylcarbazole skeleton (Japanese Unexamined Patent Publication No. 1983
-17734), trisazo pigments having a carbazole skeleton (described in JP-A-57-195767,
57-195768), phthalocyanine pigments such as CI Pigment Blue 16 (CI 74100), CI Bat Brown 5 (CI
73410), CI 73030
), perylene pigments such as Argo Scarlet 8 (manufactured by Violet) and Indanthrene Scarlet R (manufactured by Bayer), organic pigments such as square pigments: Se, Se alloy, CdS, amorphous Si
Inorganic pigments such as can be used.

Binder resins include polyamide, polyurethane,
Polyester, epoxy resin, polyketone, polycarbonate, silicone resin, acrylic resin, polyvinyl butyral.

Polyvinyl formal, polyvinyl ketone, polystyrene, poly-N-vinylcarbazole, polyacrylamide, etc. are used.

The appropriate amount of the binder resin is 5 to 100 parts by weight, preferably 10 to 50 parts by weight, based on 100 parts by weight of the charge generating material.

The solvents used here include tetrahydrofuran,
Preferred are cyclohexanone, dioxane, dichloroethane, cyclohexane, methyl ethyl ketone, ethyl cellosolve, and the like.

The average thickness of the charge generation layer is about 0.01 to 2 μm, preferably about 0.1 to 1 μm.

The charge transport layer is formed by dissolving a charge transfer substance, a binder resin and, if necessary, a plasticizer and a leveling agent in a suitable solvent, coating the solution on the charge generation layer according to the coating method described above, and drying.

As the charge transport substance, poly-N-vinylcarbazole and its derivatives, poly-γ-carbazolylethyl glutamate and its derivatives.

Pyrene-formaldehyde condensate and its derivatives, polyvinylpyrene, polyvinylphenanthrene, oxazole derivatives, oxadiazole derivatives, imidazole derivatives, triphenylamine derivatives, 9-(p-diethylaminostyryl)anthracene, 1,1-bis(4-di benzylaminophenyl) propane, styryl anthracene, styryl pyrazoline, phenylhydrazones, α-
Examples include electron-donating substances such as stilbene derivatives.

As the binder resin, polystyrene, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, styrene-maleic anhydride copolymer, polyester, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer,
Polyvinyl acetate, polyvinylidene chloride, polyacrylate resin, phenoxy resin, polycarbonate, cellulose acetate resin, ethyl cellulose resin, polyvinyl butyral, polyvinyl formal, polyvinyltoluene, poly-N-vinylcarbazole, acrylic resin, silicone resin, epoxy resin, melamine resin, urethane resin,
Examples include thermoplastic or thermosetting resins such as phenolic resins and alkyd resins.

Examples of the solvent for forming the charge transport layer include tetrahydrofuran, dioxane, toluene, monochlorobenzene, 1,2-dichloroethane, cyclohexanone, methylene chloride, 1,1,2-trichloroethane, 1,1,2.
2-tetrachloroethane and mixed solvents thereof are preferred. The thickness of the charge transport layer is 10 to 100 μm, preferably 20 to 40 μm.

As the support 11, aluminum, nickel, chromium, copper, tin oxide, indium oxide, etc. are deposited on the surface of a plastic circular tube or a plastic seamless belt, an endless nickel belt disclosed in Japanese Patent Publication No. 52-36016, an endless stainless steel belt, etc. Belt, aluminum, nickel, stainless steel, etc. 1. , I.

(2) After the raw pipe is made using extrusion, drawing, etc., the pipe is surface-treated by cutting, superfinishing, polishing, etc. Further, the protective layer is made of ultrafine metal or metal oxide powder dispersed in a binder resin. The binder resin is preferably one that is substantially transparent to visible and infrared light and has excellent electrical insulation, mechanical strength, and adhesive properties. For example, polyester resin,
Polycarbonate resin, polyurethane resin, epoxy resin, acrylic resin, vinyl chloride-vinyl acetate copolymer,
Silicone resin, alkyd resin, melamine resin, phenol resin, polyvinyl chloride resin, cyclized butadiene rubber, fluororesin, etc. can be used. Gold as a metal powder.

Silver, aluminum, iron, copper, nickel, metal oxides include zinc oxide, titanium oxide, tin oxide, bismuth oxide,
Antimony oxide, indium oxide, etc. can be used.

The composition ratio of the binder resin and the metal or metal oxide in the protective layer varies depending on the combination of materials, but gold scrap or metal oxide is added in the range of 5 to 500 parts by weight per 100 parts by weight of the binder resin. use

The thickness of the protective layer can be set between 0.5 and 30 μm as necessary.

〔Example〕

Example 1 Titanium oxide (A-100 manufactured by Ishihara Sangyo)
160g° Alxial Fat (Beccolito 6404
-50-5 32 g Dainippon Ink) Melamine resin (Super Beckamine L-117-60
17.8g (manufactured by Dainippon Ink) ・Methyl ethyl ketone (manufactured by Kanto Kagaku) 10
A mixture consisting of 1.4 g was placed in a ball mill pot, and after ball milling for 24 hours using φlO alumina balls as milling members, 15 g of methyl ethyl ketone was added.
5.6 g was added and milled for 1 hour.

After milling, remove the mill base and reduce the solid content to 1.
5tyt%, methyl ethyl ketone/cyclohexanone=
Methyl ethyl ketone and cyclohexanone were added to dilute the mixture to give a ratio of 30/70, and the mixture was stirred to prepare a subbing N coating solution. 1.1. This coating liquid was applied using the spray nozzle shown in FIG. 4 and the coating device shown in FIG. After processing, a mirror-cut aluminum drum (φ80 x ra 340) was coated with an undercoat layer with a thickness of 3 μm under the following spray conditions.
Heat drying was performed at 0° C. for 20 minutes.

Undercoat layer spray conditions Spray pressure Caspray nozzle-support distance Support rotation speed Spray nozzle scan speed Coating liquid discharge amount Number of scans 3 kg/aj 00 nn 0 rpm 4 mn/56C 1,9 cc/++in 2 times One primary composition・Trisazo pigment (A) (manufactured by Ricoh) ・Butyral resin (manufactured by XPHL UCC) ・Cyclohexanone (manufactured by Kanto Kagaku) 12.5g 2.1g 182.5g A mixture consisting of 12.5g 2.1g 182.5g was placed in a ball mill pot.
After ball milling for 48 hours using an S ball, 300 g of cyclohexanone was further added and milling was carried out for 1 hour. After milling, the mill base was taken out, diluted with cyclohexanone to give a solid content concentration of 0.9 wt %, and stirred to prepare a coating liquid for charge generation and former formation.

A charge generation layer having a thickness of 0.1 μm was coated using this coating liquid under the same spray conditions as for the undercoat layer as described below.

Heat drying was performed at 130° C. for 20 minutes.

Charge generation layer spray coating conditions, spray pressure, distance between spray nozzle and support, support rotation speed, spray nozzle scan speed, coating liquid discharge amount, number of scans, followed by the following composition, charge transport material (B) ( manufactured by Ricoh) ・Polycarbonate resin (C-1000 manufactured by Teijin Chemicals) 8
．． 5g 12.2g 3kg/cff1 120ny.

0rpm 5gm/sec 2.4cc/win 7 times・Silicone oil (KF-50 Shin-Etsu Chemical)
0.005g 1,2-dichloroethane (manufactured by Kanto Chemical)
209.3 g of a charge transport layer coating solution was prepared, and a charge transport layer having a thickness of 25 μm was coated using the coating apparatus shown in FIG. 1 and the circular nozzle shown in FIG. 2 under the following nozzle coating conditions. Heat drying was performed at 115° C. for 20 minutes.

Charge transport layer nozzle coating conditions・Circular nozzle inner diameter φ0.38m・
Nozzle-support distance: 3 mm・Support rotation speed: 75 rpm・Nozzle scan speed: 1.5+n++/sec・Coating liquid discharge amount: 6.6 cc/min・
Number of scans: 1 Example 2 The undercoat layer and charge generation layer were prepared using the same coating solution and spray coating conditions as in Example 16.Then, the following composition and charge transport material (C) (Ricoh 1)・Polycarbonate resin (K-1300 manufactured by Teijin Chemicals)・
Silicone oil (KF-50 manufactured by Shin-Etsu Chemical Co., Ltd.) and tetrahydrofuran (manufactured by Kanto Chemical Co., Ltd.) 14.2g 15.8g 0.006g 70g Charge transport layer coating liquid was prepared, and the following was applied using a circular nozzle in the same manner as in Example 1. A charge transport layer having a film thickness of 30 μm was coated under the nozzle coating conditions described below, and then heated and dried at 115° C. for 20 minutes.

Charge transport layer nozzle coating conditions, circular nozzle inner diameter, nozzle-support distance, support rotation speed, nozzle scan speed, coating liquid discharge amount, number of scans φ0.5 strokes m 67 rpa + 1.8 nn/sec 7.7 cc /m1n 1 time Example 3 ・Titanium oxide (manufactured by CR-EL Stone Industry) 60g ・Ethyl cellosolve (manufactured by Kanto Kagaku) 93.6g
Take the mixture consisting of into a ball mill pot.

Using φ10 alumina balls as mill members, after ball milling for 24 hours, 1 ounce of ethyl cellosolve was added.
75 g was added and milling was carried out for 1 hour to prepare an undercoat layer coating solution with a solid content concentration of 2 (ht%).

An undercoat layer having a thickness of 2.5 μm was applied to an aluminum drum similar to that used in Example 1 using this coating solution under the following spray coating conditions, and dried at 150° C. for 25 minutes.

Undercoat layer spray coating conditions! Spray pressure 3.5kg/c
d・Spray nozzle-support distance 100I・Support rotation speed 5Orpm・Spray nozzle scan speed 4mm/see・Coating liquid discharge amount 2.1cc/min・
Number of scans: 2 A charge generation layer was provided on the undercoat layer by spray coating in exactly the same manner as in Example 1.

Subsequently, a charge transport layer having a thickness of 20 μm was applied using the charge transport layer coating solution used in Example 1 under the following nozzle coating conditions.
Drying was performed at 5°C for 20 minutes.

Charge transport layer nozzle coating conditions/Square nozzle shape Width 2m Height 0.1mm
・Nozzle-support distance 'fi 1.2mm ・Support rotation speed 6 Orpm ・Nozzle scan speed
3mo+/sec・Coating liquid discharge amount
10cc/min・Number of scans 1
Example 4 The undercoat layer coating solution of Example 1 was applied to a seamless nickel belt (thickness: 307 zm, circumference: 400 mm) fixed to a jig with an outer diameter of 127 mm using the spray nozzle shown in FIG.
s+X width 303 on) to the coating device shown in Figure 1,
An undercoat layer having a thickness of 2.5 μm was applied under the following spray conditions and dried by heating at 150° C. for 20 minutes.

Undercoat layer coating conditions/spray pressure 3.5kg/a
J. Spray nozzle-support pressure '14 100+
nm/Support rotation speed 50rp+
i.Spray nozzle scan speed t 4nn/s
EC/coating liquid discharge amount 3cc/w
Number of in-scans: 2 The charge generation layer coating solution of Example 1 was spray coated on the undercoat layer under the following spray conditions.

A charge generation layer having a thickness of 0.1 μm was obtained. Thereafter, heat drying was performed at 130° C. for 20 minutes.

Charge-generating layer spray coating conditions・Spray pressure・Spray nozzle-support distance・Support rotation speed・Spray nozzle scan speed 3kg/a+f 00m 00rpm 5mm/see・Coating liquid discharge amount 3.6cc/m
Number of in-scans: 8 times The charge transport layer coating solution used in Example 1 was further applied onto the charge generation layer using the following nozzle coating conditions to form a charge transport layer with a film thickness of 22 μm, and then heated at 115°C for 20 minutes. Heat drying was performed.

Charge transport layer nozzle coating conditions, circular nozzle shape, nozzle-support distance, support rotation speed, nozzle scan speed, coating liquid discharge amount, number of scans Example 5 A seamless nickel belt was prepared in exactly the same manner as in Example 4. (
Thickness: 30 p m, circumference: 400 mm x width: 303 m+)
An undercoat layer and a charge generation layer were provided on top by spray coating. Further, the charge transport layer coating liquid used in Example 2 was applied onto the charge generation layer using the following nozzle coating conditions to form a charge transport layer with a thickness of 25 μm. Formed once at 17cc/m1n. Thereafter, it was heated and dried at 115° C. for 20 minutes.

Charge transport layer nozzle coating conditions/square nozzle shape Width 1.511n x height 0.
15m++・Distance between nozzle and support 0.8n
u・Support rotation speed 75rpm・Nozzle scan speed 2m+n/see・Coating liquid discharge amount 12cc/win・Scanning number
Comparative Example 1 An aluminum drum (φ80
(n+m x Q 340nn), a subbing layer and a charge generation layer were provided by spray coating. Further, the charge transport layer coating solution of Example 1 was applied onto the charge generation layer under the following nozzle coating conditions, and after forming the charge transport layer, it was heated and dried at 115° C. for 20 minutes.

During coating, uneven film thickness occurred in the longitudinal direction of the support.

Charge transport layer nozzle coating conditions Circular nozzle inner diameter φ0.5mm
・Nozzle-support distance ・Support rotation speed ・Nozzle scan speed ・Coating liquid discharge amount ・Number of scans Comparative Example 2 A seamless nickel belt (
A subbing layer and a charge generation layer were provided on the film (thickness: 30 μm, circumferential length: 400 mm, width: 303 nn) by spray coating. The charge transport layer coating solution of Example 2 was applied onto the charge generation layer under the following nozzle coating conditions to form a charge transport layer.
Drying was performed by heating for a minute. During coating, there were defective areas where no coating was formed.

Charge transport layer nozzle coating conditions/square nozzle shape width 1.5mm x height 0.1
5n*n・Nozzle-support distance 0.5 n.

・Support rotation speed 75rpa+・Nozzle scan speed 2.7mm/sec・Coating liquid discharge amount 12cc/l! 1in0.80rpm 1.5nn/sec 9cc/m1n 1 time/Number of scans 1 time [Effect] The surface roughness of the electrophotographic photoreceptor prepared in this way is D.
It was measured with ectack II (Sol, manufactured by AN).

Further, the electrophotographic photoreceptors of Examples 1 to 3 and Comparative Example 1 were used in an electrostatic copying machine (Imagi No. 320, manufactured by Ricoh), and the electrophotographic photoreceptors of Examples 4 to 5 and Comparative Example 2 were used in an electrostatic facsimile machine (Imagi No. 320, manufactured by Ricoh). Image evaluation was performed using Riftex 5], 01S (manufactured by Ricoh). In addition, the nozzle coating conditions for the charge transport layer of these electrophotographic photoreceptors were organized. Table 1 shows the results. For larger film thickness, use Permascope (manufactured by Kete Co., Ltd.)
It was measured with

(Hereinafter, blank space) When nozzle coating is performed under coating conditions that satisfy formula (1) as described above, a coating film with excellent smoothness and no coating streaks can be obtained.

[Brief explanation of drawings]

FIG. 1 shows an example of a coating device used in the present invention. FIG. 2 shows an example of an enlarged view of the vicinity of the nozzle of the coating device used in the present invention. Figure 3 shows a modified example of the nozzle in Figure 2, and Figure 4 shows another example.
Here are two modified examples. 10: Coating liquid 11: Support 12: Motor 13: Rotating shaft of support 14: Nozzle 15: Flexible tube 16: Coating liquid tank 7: Pump 18: Filter 19: Nozzle moving device 20: Ball screw 21: Motor 22: Nozzle holding member
23 Varnish Ride 24: Valve 25: Pipe 27: Spray Nozzle 28: 21 Dollar 29: 30: 31: 32: Needle protrusion amount adjustment knob Carrier gas introduction pipe Needle operation Gas introduction pipe nozzle part

Claims (1)

[Scope of Claims] 1. In a method for manufacturing an electrophotographic photoreceptor in which a coating liquid is spirally coated onto a support having an endlessly formed continuous peripheral surface using a nozzle, the scanning speed of the nozzle vs. , a method for manufacturing a photoreceptor, characterized in that the solid content concentration of the coating liquid, the discharge amount w of the coating liquid from the nozzle, and the circumferential length L of the support satisfy the following formula. Lvs≦5×10^2kw≦1.5Lvs However, this excludes the case where both are equal signs. (In the formula, k: coating liquid solid content concentration (wt%) w: coating liquid discharge amount (cc/sec) vs: nozzle scan speed (cm/sec) L: support circumference (cm). )