Patent US5001027A successfully refreshed from Google Patents.
US5001027A
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US
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Electrophotographic apparatus and method
Assignee: Mitsubishi Chemical Corp
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Filing: 1989-06-07
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Granted: 1991-03-19
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Expires: 2009-06-07
Abstract
Abstract Disclosed herein is an electrophotographic apparatus and method which repeatedly use an electrophotographic photoreceptor having on an electroconductive support a photosensitive layer formed by dispersing a charge-generating substance in a binder containing a charge-transporting substance and a binder resin and a means or step for optically erasing the residual charges on the photoreceptor after transfer, the main component of a light used in the means for optically erasing the residual charges having the wavelength range which satisfies the condition defined in the formula (1): l/d≦0.5 (1) ps wherein l is the distance of penetration of the light, i.e. the distance in the direction of depth in which the light incident on the photosensitive layer is attenuated to one tenth in intensity, and d is the thickness of the photosensitive layer.
Inventors
- 👤 Shigenori Otsuka
- 👤 Itaru Ogawa
- 👤 Kazuyuki Mito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:07
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/06; G03G21/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
An electrophotographic method which repeatedly uses an electrophotographic photoreceptor which have on an electroconductive support a photosensitive layer formed by dispersing a charge-generating substance in a binder containing a charge-transporing substance and a binder resin and which includes the step for optically erasing the residual charges on the photoreceptor after transfer, the main component of a light used for optically erasing the resiudal charges having the wavelength range which satisfies the condition defined in the formula (1): l/d≦0.5 (1) wherein l is the distance of penetration of the light, i.e. the distance in the direction of depth in which the light incident on the photosensitive layer is attenuated to one tenth in intensity, and d is the thickness of the photosensitive layer.
Claim 2
Dependent Claim
122 words
An electrophotographic method which repeatedly uses an electrophotographic photoreceptor which have on an electroconductive support a photosensitive layer formed by dispersing a charge-generating substance in a binder containing a charge-transporing substance and a binder resin and which includes the step for optically erasing the residual charges on the photoreceptor after transfer, the main component of a light used for optically erasing the resiudal charges having the wavelength range which satisfies the condition defined in the formula (1): l/d≦0.5 (1) wherein l is the distance of penetration of the light, i.e. the distance in the direction of depth in which the light incident on the photosensitive layer is attenuated to one tenth in intensity, and d is the thickness of the photosensitive layer.
Claim 3
Dependent Claim
39 words
A method according to claim 1, wherein as the light for optically erasing the residual charges, there is used a light obtained by eliminating unnecessary wavelength components from a light source having wide wavelength range through a color filter.
Claim 4
Dependent Claim
32 words
A method according to claim 1, wherein as the light for optically erasing the residual charges, there is used a light from a light source having an emission spectrum with narrow distribution.
Claim 5
Dependent Claim
20 words
A method according to claim 1, wherein the distance of penetration in the formula (1) is 10 micrometers or less.
Claim 6
Dependent Claim
26 words
A method according to claim 1, wherein the charge-generating substance in an amount of 1 to 20 percent by weight is dispersed in the photosensitive layer.
Claim 7
Dependent Claim
42 words
A method according to claim 1, wherein the charge-generating substance dispersed in the photosensitive layer is one or more compounds selected from the group consisting of azo pigment, phthalocyanine pigment, perylene pigment, polycyclic quinone pigment, quinacridone pigment, indigo pigment and squarilium salt.
Claim 8
Dependent Claim
25 words
A method according to claim 1, wherein the charge-transporting substance in the photosensitive layer is a hydrazone derivative, an aniline derivative or a stilbene derivative.
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) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |