US4600670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing member for electrostatic photocopying
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1984-03-23
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Granted: 1986-07-15
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Expires: 2004-03-23
Abstract
Abstract A printing member for electrostatic photocopying, comprises a substrate having a conductive surface and a photoelectric-sensitive, electrically chargeable layer deposited on the conductive surface of the substrate. The electrically chargeable layer has a non-single crystal semiconductor layer having a built-in-potential, or the non-single crystal semiconductor layer and an insulating or semi-insulating layer.
Inventors
- 👤 Shunpei Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:47
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/08214; G03G5/08221; G03G5/08235; G03G5/0825
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
198 words
A printing member for electrostatic photocopying consisting essentially of: a substrate having a conductive surface; and a photoelectrically-sensitive, electrically chargeable layer on the conductive surface of the substrate; wherein the photoelectrically-sensitive, electrically chargeable layer has a non-single-crystalline semiconductor layer on the conductive surface of the substrate and a chargeable layer formed on the non-single-crystalline semiconductor layer; wherein the non-single-crystalline semiconductor layer has a first layer on the side of the substrate and a second layer on the first layer to create a transition region; wherein the first layer is P or N type and is formed principally of Si, Si 3 N 4-x (0<x<4) SiC 1-x (0<x<1), or SiO 2-x (0<x<2) and contains hydrogen, flourine or chlorine, the second layer is I type and is formed principally of SiO 2-x (0<x<2) and contains hydrogen, flourine or chlorine, and the transistion region is PI or NI type depending on whether the first layer is P or N type; and wherein the energy band gap of the second layer is less than the energy band gap of the chargeable layer; wherein the chargeable layer is formed principally of SiO 1-x (0<x<2), Si 3 N 4-x (0<x<4) or SiC 1-x (0<x<1).
Claim 2
Dependent Claim
198 words
A printing member for electrostatic photocopying consisting essentially of: a substrate having a conductive surface; and a photoelectrically-sensitive, electrically chargeable layer on the conductive surface of the substrate; wherein the photoelectrically-sensitive, electrically chargeable layer has a non-single-crystalline semiconductor layer on the conductive surface of the substrate and a chargeable layer formed on the non-single-crystalline semiconductor layer; wherein the non-single-crystalline semiconductor layer has a first layer on the side of the substrate and a second layer on the first layer to create a transition region; wherein the first layer is P or N type and is formed principally of Si, Si 3 N 4-x (0<x<4) SiC 1-x (0<x<1), or SiO 2-x (0<x<2) and contains hydrogen, flourine or chlorine, the second layer is I type and is formed principally of SiO 2-x (0<x<2) and contains hydrogen, flourine or chlorine, and the transistion region is PI or NI type depending on whether the first layer is P or N type; and wherein the energy band gap of the second layer is less than the energy band gap of the chargeable layer; wherein the chargeable layer is formed principally of SiO 1-x (0<x<2), Si 3 N 4-x (0<x<4) or SiC 1-x (0<x<1).
Claim 3
Dependent Claim
30 words
A printing member according to claim 1 wherein the chargeable layer is an insulating layer formed of Si 3 N 4 and having a thickness of 30 to 100 Å.
Claim 4
Dependent Claim
35 words
A printing member according to claim 1 wherein the chargeable layer is a semi-insulating layer formed of the SiO 2-x (0<x<)or Si 3 N 4-x (0<x<4) and having a thickness of 50 to 500 Å.
Claim 5
Dependent Claim
43 words
A printing member as in claim 1 where said first layer is of the P type and the energy difference between the valence band and the Fermi level is greater at the second, I type layer than at the first, P type layer.
Claim 6
Dependent Claim
41 words
A printing member as in claim 1 wherein the first layer is N type and the energy difference between the conduction band the the Fermi level is greater at the second, I type layer than at the first, N type layer.
Claim 7
Dependent Claim
32 words
A printing member as in claim 1 wherein said first layer of the P or N type and the second layer of the I type have a wide-to-narrow energy band gap structure.
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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |