US4766048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic photosensitive member having surface layer containing fine spherical resin powder and apparatus utilizing the same
Assignee: Canon Inc
•
Filing: 1987-02-20
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Granted: 1988-08-23
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Expires: 2007-02-20
Abstract
Abstract An electrophotographic photosensitive member comprises an electroconductive support and a photosensitive layer laid thereon, the electrophotographic photosensitive member having a surface layer containing fine spherical resin powder.
Inventors
- 👤 Masafumi Hisamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:08
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0596; G03G5/043; G03G5/047; G03G5/0557; G03G5/0578; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/151
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
82 words
An electrophotographic photosensitive member which comprises an electroconductive support having a photosensitive layer thereon, wherein the electrophotographic photosensitive member has a surface layer containing fine spherical resin powder having an average degree of sphericity of at least 0.5 in terms of the ratio of the diameter of the maximum incircle of the particles to the diameter of the minimum circumcircle of the particles as the circumcircle being 1, when at least 20 randomly selected particles are observed by a scanning electron microscope.
Claim 2
Dependent Claim
82 words
An electrophotographic photosensitive member which comprises an electroconductive support having a photosensitive layer thereon, wherein the electrophotographic photosensitive member has a surface layer containing fine spherical resin powder having an average degree of sphericity of at least 0.5 in terms of the ratio of the diameter of the maximum incircle of the particles to the diameter of the minimum circumcircle of the particles as the circumcircle being 1, when at least 20 randomly selected particles are observed by a scanning electron microscope.
Claim 3
Dependent Claim
20 words
An electrophotographic photosensitive member according to claim 1, wherein said fine spherical resin particles are of a setting type resin.
Claim 4
Dependent Claim
29 words
An electrophotographic photosensitive member according to claim 2, wherein said setting type resin is a resin selected from silicon resins, melamine resins, urea resins, acrylic resins and styrene resins.
Claim 5
Dependent Claim
20 words
An electrophotographic photosensitive member according to claim 1, wherein said fine spherical resin particles are spherical silicone resin fine particles.
Claim 6
Dependent Claim
17 words
An electrophotographic photosensitive member according to claim 1, wherein said degree of sphericity is 0.8 or higher.
Claim 7
Dependent Claim
28 words
An electrophotographic photosensitive member according to claim 1, wherein the photosensitive layer is composed of a lamination structure of a charge generation layer and a charge transport layer.
Claim 8
Dependent Claim
37 words
An electrophotographic photosensitive member according to claim 1, wherein the photosensitive layer is composed of a lamination structure of a charge generation layer and a charge transport layer, and the surface layer is the charge transport layer.
Claim 9
Dependent Claim
23 words
An electrophotographic photosensitive member according to claim 1, wherein the fine spherical resin powder has a particle size of 0.6 to 6 μm.
Claim 10
Dependent Claim
22 words
An electrophotographic photosensitive member according to claim 8, wherein the fine spherical resin particles have particle sizes of 1 to 4 μm.
Claim 11
Dependent Claim
21 words
An electrophotographic photosensitive member according to claim 1, wherein the fine spherical resin particles have specific gravities of 0.7 to 1.7.
Claim 12
Dependent Claim
21 words
An electrophotographic photosensitive member according to claim 10, wherein the fine spherical resin particles have specific gravities of 0.9 to 1.5.
Claim 13
Dependent Claim
27 words
An electrophotographic photosensitive member according to claim 7, wherein 10 to 20% by weight of the fine spherical resin powder is contained in the charge transport layer.
Claim 14
Dependent Claim
22 words
An electrophotographic photosensitive member according to claim 7, wherein the charge transport layer has a film thickness of 3 to 30 μm.
Claim 15
Dependent Claim
22 words
An electrophotographic photosensitive member according to claim 7, wherein the charge transport layer has a film thickness of 5 to 20 μm.
Claim 16
Dependent Claim
22 words
An electrophotographic photosensitive member according to claim 7, wherein the charge generation layer has a film thickness of 0.01 to 1 μm.
Claim 17
Dependent Claim
22 words
An electrophotographic photosensitive member according to claim 7, wherein the charge generation layer has a film thickness of 0.05 to 0.5 μm.
Claim 18
Dependent Claim
27 words
An electrophotographic photosensitive member according to claim 1, wherein the electroconductive support is composed of a lamination structure of a support and an electroconductive layer laid thereon.
Claim 19
Dependent Claim
29 words
An electrophotographic photosensitive member according to claim 1, wherein the electrophotographic photosensitive member is applied to an electrophotographic process using a laser beam as an image exposure light source.
Claim 20
Dependent Claim
25 words
An electrophotographic device which comprises an electrophotographic photosensitive member according to claim 1, an electrocharging means, a laser beam exposure means, and a developing means.
Claim 21
Dependent Claim
19 words
An electrophotographic device according to claim 19, wherein said fine spherical resin particles are of a setting type resin.
Claim 22
Dependent Claim
28 words
An electrophotographic device according to claim 20, wherein said setting type resin is a resin selected from silicone resins, melamine resins, urea resins, acrylic resins and styrene resins.
Claim 23
Dependent Claim
19 words
An electrophotographic device according to claim 19, wherein said fine spherical resin particles are spherical silicone resin fine particles.
Claim 24
Dependent Claim
16 words
An electrophotographic device according to claim 22, wherein said degree of sphericity is 0.8 or higher.
Claim 25
Dependent Claim
27 words
An electrophotographic device according to claim 19, wherein the photosensitive layer is composed of a lamination structure of a charge generation layer and a charge transport layer.
Claim 26
Dependent Claim
36 words
An electrophotographic device according to claim 19, wherein the photosensitive layer is composed of a lamination structure of a charge generation layer and a charge transport layer, and the surface layer is the charge transport layer.
Claim 27
Dependent Claim
22 words
An electrophotographic device according to claim 19, wherein the fine spherical resin powder has a particle size of 0.1 to 6 μm.
Claim 28
Dependent Claim
21 words
An electrophotographic device according to claim 26, wherein the fine spherical resin particles have particle sizes of 1 to 4 μm.
Claim 29
Dependent Claim
20 words
An electrophotographic device according to claim 19, wherein the fine spherical resin particles have specific gravities of 0.7 to 1.7.
Claim 30
Dependent Claim
20 words
An electrophotographic device according to claim 28, wherein the fine spherical resin particles have specific gravities of 0.9 to 1.5.
Claim 31
Dependent Claim
26 words
An electrophotographic device according to claim 25, wherein 10 to 20% by weight of the fine spherical resin powder is contained in the charge transport layer.
Claim 32
Dependent Claim
21 words
An electrophotographic device according to claim 25, wherein the charge transport layer has a film thickness of 3 to 30 μm.
Claim 33
Dependent Claim
21 words
An electrophotographic device according to claim 25, wherein the charge transport layer has a film thickness of 5 to 20 μm.
Claim 34
Dependent Claim
21 words
An electrophotographic device according to claim 25, wherein the charge generation layer has a film thickness of 0.01 to 1 μm.
Claim 35
Dependent Claim
21 words
An electrophotographic device according to claim 25, wherein the charge generation layer has a film thickness of 0.05 to 0.5 μm.
Claim 36
Dependent Claim
26 words
An electrophotographic device according to claim 19, wherein the electroconductive support is composed of a lamination structure of a support and an electroconductive layer laid thereon.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |