JP2000098804A - Electrophotographic photoreceptor drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent production of an abnormal sound and to prevent irregular electrification by inserting a filling material into the inside of a supporting body and fixing the filling material with an adhesive mixed with a resin filler to the inner face of the supporting body. SOLUTION: A filling material 1 is inserted into the inside of the supporting body of the photoreceptor drum 4, and the filling material 1 is fixed with an adhesive 5 mixed with a resin filler to the inner wall 2a of the supporting body. The adhesive used is preferably an anaerobic adhesive. The resin filler used is a crosslinked copolymer essentially consisting of divinylbenzene, and its particle size is preferably 2 to 100 μm, more preferably 5 to 16 μm. The mixing ratio of the resin filler to the adhesive is preferably 7:13 to 1:99 by weight, and more preferably 1:2 to 2:1. Thereby, deformation of the supporting body due to uneven coating state of the adhesive can be prevented and the quality of obtd. images can be improved. Moreover, production of abnormal sound can be prevented by the antivibration effect of the filling material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive for fixing a pad inserted into an electrophotographic photosensitive drum, and an electrophotographic photosensitive drum using the same.

[0002]

2. Description of the Related Art In recent years, as electrophotographic apparatuses have become smaller and lighter, the photoreceptor drum has also been required to be smaller and lighter. , Thinner ones have been used. Further, instead of corona discharge as a charging method of the electrophotographic process, a contact charging method in which a conductive member (charging member) such as a roller, a brush, or a blade to which a voltage is applied is brought into contact with the surface of the photosensitive drum is increasing.

[0003] This contact charging system has merits such as reduction of ozone generation and reduction of applied voltage. However, on the other hand, problems such as generation of resonance due to friction of the cleaning blade or generation of abnormal noise due to resonance with the contact charger have been emphasized. As means for reducing this noise to solve this problem, Japanese Utility Model Application Laid-Open No. 62-12
Japanese Patent No. 7567 discloses that a member for absorbing or suppressing vibration is provided on the inner surface of a photosensitive drum.
Japanese Patent Application Laid-Open No. 3-60481 discloses that a buffer is pressed into a photosensitive drum.
No. 48 describes that a viscoelastic material is filled in a photosensitive drum. Also, JP-A-5-3516
No. 7 reports that a sound level that does not pose a practical problem is achieved by fixing the gap between the photosensitive drum base (support) and the filler within 100 μm by bonding.

[0004]

As described above, the sound is generated from the electrophotographic photosensitive drum due to the vibration of the contact charging system, and the friction is caused by the friction of a process unit (for example, a cleaning blade or the like) which comes into contact with the photosensitive drum. In order to respond to noise, the entire weight can be reduced by putting a filler such as metal or elastic body inside the electrophotographic photosensitive drum, or attaching a heavy object to the flange such as ABS resin material attached to both ends to rotate and drive. Means for reducing abnormal noise such as increasing the number of noises are taken. In addition, when a metal vibration absorbing member (filler) is placed inside the electrophotographic photosensitive drum, it is necessary to fix the photosensitive drum and the filler, and a method of fixing with an adhesive has been proposed.

[0005] However, when the photosensitive drum base is combined with a metal or elastic filler, the adhesive must be interposed between the inner wall of the drum base and the outer wall of the filler. Due to the relationship between the uniformity and the shrinkage rate of the adhesive itself, the drum substrate at the portion where the filler is inserted is deformed, and the charging device causes uneven charging in a device that copies by the contact charging method. There is a problem that an image having uneven density occurs in a tone image.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electrophotographic photosensitive drum suitable for use in a contact charging system, capable of preventing generation of abnormal noise and causing no uneven charging.

[0007]

According to the present invention, first, there is provided a photosensitive drum having a photoconductive layer formed on an outer peripheral surface of a support and being charged by being brought into contact with a charging member. Wherein the filler inserted into the support is fixed to the inner surface of the support with an adhesive mixed with a resin filler.

Second, the first electrophotographic photosensitive drum is provided, wherein the adhesive is an anaerobic adhesive.

Third, the first or second electrophotographic photosensitive drum is characterized in that the resin filler is a crosslinked copolymer containing divinylbenzene as a main component.

Fourth, the particle size of the resin filler is 2 to 100.
μm, wherein the first, second or third electrophotographic photosensitive drum is provided.

Fifth, the mixing ratio between the resin filler and the adhesive is in the range of 7:13 to 1:99 by weight, and the electrophotographic photosensitive member according to any one of the first to fourth aspects above, A body drum is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. FIG. 1 shows an example of a filler 1 used for vibration damping of a photoreceptor drum, which is a 28.25 mmφ × 60 mm cylindrical aluminum product. However, the filler that can be used in the present invention may be cylindrical or cylindrical. The material of the filler may be a metal material such as brass cast, iron, stainless steel, or the like, or a plastic molding material containing metal powder, an inorganic material such as cement, or a rubber material. FIG. 2 shows the photosensitive drum 4
2 shows a state in which the filler 1 is inserted into the inside of the support, and the filler is fixed to the inner wall 2a of the support with the adhesive 5 mixed with the resin filler. In the figure, 2 is a support, 3 is a photoconductive layer,
Reference numeral 6 denotes a drum end surface member.

The adhesive which can be used in the present invention is preferably an anaerobic adhesive, and is commercially available as Three Bond 1303N (Viscosity 150 mPa.
s), Three Bond 1373N (viscosity 90 mPas),
Rocktire's LOCTITE601 (viscosity 100m
Pas). Generally known cyanoacrylate adhesives and epoxy adhesives are not suitable for use in the present invention. That is, the cyanoacrylate-based adhesive has a phenomenon in which the adhesive itself sublimes and whitens by reacting with moisture in the air. In addition, since the epoxy adhesive is a two-liquid mixture type, the pot life of the adhesive is short, and there is a problem in the decrease in adhesive ability and operability.

The resin filler usable in the present invention is a crosslinked copolymer containing divinylbenzene as a main component.
Preferably the particle size is 2 to 100 μm, preferably 5 to 1
6 μm. Here, the particle size of the resin filler is a number average particle size measured by a Coulter counter (ZB-1 / C-1000). Commercially available resin fillers include "Micropearl SP-241, SP-205, SP-208, SP-2" manufactured by Sekisui Fine Chemical Co., Ltd.
10 "and the like.

In order to prepare an adhesive mixed with a resin filler, the adhesive may be put in an appropriate container, and the resin filler may be charged into the container and mixed with stirring. The mixing ratio between the resin filler and the adhesive is suitably from 7:13 to 1:99 by weight, preferably from 1: 2 to 2: 1. Outside of this range, uneven application of the adhesive may occur or good adhesion may not be achieved.

As the bonding means, (a) the resin-filled adhesive is applied to the inner surface of the drum base (support) in advance, and (b) the resin-filled adhesive is applied to the outer surface of the filler. This may be inserted into the inside of the drum base, or (c) a filler is inserted into the inside of the drum base, and an adhesive containing a resin filler is filled between the inner wall of the support and the filler. May be injected.

[0017]

EXAMPLES (Preparation of photoreceptor drum) 15 parts by weight of alkyd resin Beccosol 1307-60EL (solid content: 60 wt%) (manufactured by Dainippon Ink and Chemicals, Inc.), melamine resin Super Beckamine G821-60 (solid content: 60%) 10 parts by weight (manufactured by Dainippon Ink and Chemicals, Inc.) were dissolved in 50 parts by weight of methyl ethyl ketone, and 90 parts by weight of titanium oxide powder TYPAKE CR-EL (manufactured by Ishihara Sangyo Co., Ltd.) was added thereto. The mixture was dispersed to prepare an intermediate layer coating solution. This was applied on an aluminum hollow cylindrical support having an outer diameter of φ30 mm, a length of 340 mm and a thickness of 0.75 mm, and dried at 130 ° C. for 30 minutes to form an intermediate layer having a thickness of 2 μm.

Next, 5 parts by weight of butyral resin ESLEK BLS (manufactured by Sekisui Chemical Co., Ltd.) was dissolved in 150 parts by weight of cyclohexanone, 10 parts by weight of a trisazo pigment of the formula (1) was added, and the mixture was dispersed in a ball mill for 48 hours. Further, 210 parts by weight of cyclohexanone was added and dispersed for 3 hours.

Embedded image The coating solution for a charge generation layer obtained in this manner was dip-coated on the intermediate layer, and dried at 125 ° C. for 10 minutes.
A charge generation layer having a thickness of 0.2 μm was formed.

Further, 8 parts by weight of the charge transporting substance of the formula (2), 10 parts by weight of polycarbonate resin Panlite C-1400 (manufactured by Obijin Kasei Co., Ltd.), and silicone oil KF-5
0 (manufactured by Shin-Etsu Chemical Co., Ltd.) was dissolved in 90 parts by weight of methylene chloride. The thus-obtained charge transport layer coating solution was dip-coated on the charge generation layer,
The resultant was dried at 20 ° C. for 20 minutes to form a charge transport layer having a thickness of 30 μm, thereby obtaining an electrophotographic photosensitive drum.

Embedded image

(Preparation of Packing Material)
A 5 mm × 60 mm aluminum column was prepared.

Example 1 A resin filler Micropearl SP214 (Sekisui Fine Chemical Co., Ltd.) was added to 20 g of an anaerobic adhesive Three Bond 1303N (manufactured by Three Bond Co., Ltd., viscosity: 150 mPas).
(Grain size: 14 μm), and the adhesive and the resin filler were mixed in advance. The filler of the support was placed in the hollow cylindrical shape of the photoreceptor, and the adhesive liquid mixed with the resin filler was applied between the inner wall of the support and the filler while being rotated by a dispenser. At this time, the applied amount of the adhesive liquid mixed with the resin filler is 0.4 g. After leaving the photoreceptor thus obtained for a day and a night, a copying machine (manufactured by Ricoh Co., Ltd., IMAGIOMF-20) equipped with a blade type cleaning unit, a contact charger and a developing device.
0), a halftone image was output, and it was confirmed that the image had no density unevenness.

Examples 2 to 7 and Comparative Examples 1 and 2 A photosensitive member was prepared in the same manner as in Example 1 except that the type of the adhesive and the resin filler and the mixture of the resin filler and the adhesive were changed. It was created and the same image output was performed. Table 1 shows the results.

[0023]

[Table 1]

[0024]

(1) According to the first aspect of the present invention, the filler to be inserted into the photoreceptor support for anti-vibration is fixed with an adhesive containing a resin filler, thereby reducing the adhesive. Deformation of the support due to uneven coating can be prevented, the quality of the obtained image can be improved, and generation of abnormal noise can be prevented by the vibration-proof effect of the filler. (2) According to the second aspect of the present invention, since the anaerobic adhesive is used, the adhesive does not whiten or sublime inside the support, and good adhesive ability is maintained. . (3) According to the third aspect of the invention, since the resin filler has a more uniform particle size distribution than the inorganic filler material, a uniform adhesive layer can be formed. (4) According to the fourth aspect of the present invention, since the particle size of the resin filler is set to 2 to 100 μm, the adhesive liquid mixed with the resin filler enters into the corners of the gap, and the permeation unevenness of the adhesive can be minimized. . (5) According to the invention of claim 5, the mixing ratio between the resin filler as a powder and the adhesive as a liquid maximizes the effect.

[Brief description of the drawings]

FIG. 1 is a schematic view of an example of a packing.

FIG. 2 is a diagram illustrating an example of a state in which a filler is inserted into a photosensitive member support;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filler 2 Support (2a support inner wall) 3 Photoconductive layer 4 Photoconductor drum 5 Adhesive mixed with resin filler 6 Drum end surface member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naohiro Toda 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company (72) Inventor Kibo Saito 1-3-6 Nakamagome, Ota-ku, Tokyo Stock F-term in Ricoh Company (reference) 2H035 CA07 CB02 CB03 2H068 AA21 AA54 AA60 BB10 BB57 EA07

Claims (5)

[Claims] 1. A photosensitive drum having a photoconductive layer formed on an outer peripheral surface of a support and charged by contacting a charging member, wherein a filler inserted into the support is filled with an adhesive mixed with a resin filler. An electrophotographic photosensitive drum fixed to the inner surface of the support. 2. The electrophotographic photosensitive drum according to claim 1, wherein the adhesive is an anaerobic adhesive. 3. The resin composition according to claim 1, wherein the resin filler is a crosslinked copolymer containing divinylbenzene as a main component.
Or the electrophotographic photosensitive drum according to 2. 4. The electrophotographic photosensitive drum according to claim 1, wherein a particle size of the resin filler is 2 to 100 μm. 5. The electrophotographic photosensitive drum according to claim 1, wherein the mixing ratio of the resin filler and the adhesive is in the range of 7:13 to 1:99 by weight. .