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Patent EP0292140A2 successfully refreshed from Google Patents.
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EP0292140A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Photoreceptor

Assignee: Optical Diagnostic Systems Inc
•
Filing: 1988-05-03
•
Granted: —
•
Expires: 2008-05-03
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Abstract

Abstract A method and apparatus are described for the nondestructive readout of a latent electrostatic image formed on a sheet or layer of insulating material. A sheet or layer (419) of semiconductor material is disposed in relatively close proximity to the insulating material (413, 421). A latent electrostatic image formed on the insulating material (413) (by any known means) causes a surface depletion layer to be produced by induction at the surface of the semiconductor material (419). The location and distribution of the accumulated charges on the semiconductor material are read out as analog electrical signals corresponding to the AC surface photovoltage induced on the semiconductor material as the semiconductor material is scanned with a low intensity modulated light beam of appropriate wavelength, the magnitude of the analog signals depending on the local charge density. The analog electrical signals so obtained are then digitized, processed and stored and/or displayed.

Inventors

  • 👤 Emil Kamieniecki
  • 👤 William C. Goldfarb

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 02:42
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/24; G01R31/00; G01R31/26; G01R31/265; G01R31/2656; G01T; G01T1/00; G01T1/16; G01T1/24; G01T1/246; G01T1/28; G03; G03G; G03G15/00; G03G15/04; G03G15/04036; G03G15/04045; G03G15/054; G03G15/22; G03G15/221; G03G5/00; G03G5/02

Claims Analysis

Total Claims: 21
Claim 1
Independent Claim 83 words
A photoreceptor (401, 501) comprising: a. a sensing unit (403, 502), and b. a readout unit (405, 504), c. said sensing unit (403, 502) including a photoconductive insulator (411, 101), d. said readout unit (405, 504) including: i. a semiconductor (419, 507), ii. a protective insulating layer (421, 111) on top of said semiconductor, and iii. a conductive layer (423) on top of said protective insulating layer and serving as a reference electrode, said conductive layer being in the shape of a grid.
Claim 2
Dependent Claim 83 words
A photoreceptor (401, 501) comprising: a. a sensing unit (403, 502), and b. a readout unit (405, 504), c. said sensing unit (403, 502) including a photoconductive insulator (411, 101), d. said readout unit (405, 504) including: i. a semiconductor (419, 507), ii. a protective insulating layer (421, 111) on top of said semiconductor, and iii. a conductive layer (423) on top of said protective insulating layer and serving as a reference electrode, said conductive layer being in the shape of a grid.
Claim 3
Dependent Claim 15 words
The photoreceptor of Claim 1 and wherein the grid is a pattern of conductive strips.
Claim 4
Dependent Claim 15 words
The photoreceptor of Claim 2 and wherein the conductive strips are in a rectangular pattern.
Claim 5
Dependent Claim 16 words
A photoreceptor of Claim 2 and wherein the conductive strips are in an irregularly shaped pattern.
Claim 6
Dependent Claim 17 words
The photoreceptor of Claim 1 and wherein the sensing unit and the readout unit are separate devices.
Claim 7
Dependent Claim 18 words
The photoreceptor of Claim 1 and wherein the sensing unit and the readout unit are a unitary structure.
Claim 8
Dependent Claim 15 words
The photoreceptor of Claim 1 and wherein the sensing unit includes a photoconductive insulating unit.
Claim 9
Dependent Claim 19 words
The photoreceptor of Claim 1 and wherein said readout unit is smaller and movable relative to said recording unit.
Claim 10
Dependent Claim 11 words
The photoreceptor of Claim 1 and wherein said semiconductor is segmented.
Claim 11
Dependent Claim 38 words
The photoreceptor of Claim 1 and wherein said sensing unit comprises: a. a conductive substrate, b. a photoconductive insulating layer underneath said conductive substrate, and c. a protective insulating layer on the bottom of said photoconductive insulating layer.
Claim 12
Dependent Claim 40 words
Apparatus for use in recording and reading out an image comprising: a. a photoreceptor (401, 501) having: i. a photoconductive insulator (411, 101), ii. a reference electrode (423) in the form of a grid, and iii. a semiconductor (419, 507)
Claim 13
Dependent Claim 40 words
Apparatus for use in recording and reading out an image comprising: a. a photoreceptor (401, 501) having: i. a photoconductive insulator (411, 101), ii. a reference electrode (423) in the form of a grid, and iii. a semiconductor (419, 507)
Claim 14
Dependent Claim 5 words
b. a light source (53)
Claim 15
Dependent Claim 5 words
b. a light source (53)
Claim 16
Dependent Claim 4 words
c. focusing optics (55)
Claim 17
Dependent Claim 4 words
c. focusing optics (55)
Claim 18
Dependent Claim 5 words
d. a scanner (57) and
Claim 19
Dependent Claim 5 words
d. a scanner (57) and
Claim 20
Dependent Claim 4 words
e. readout electronics (59)
Claim 21
Dependent Claim 4 words
e. readout electronics (59)

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