EP0002102A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Xerographic printer/copier device with converter for converting information from a latent image of an original document into electrical signals
Assignee: International Business Machines Corp
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Filing: 1978-10-02
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Granted: —
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Expires: 1998-10-02
Abstract
Abstract A xerographic printer/copier includes a photoconductor drum (4), means for producing a latent image, from an original document, on the drum and a laser beam scanning system (24, 25, 28 and 27) normally employed to produce such a latent image in response to input digital data. The system also includes a detector (30) placed adjacent the photoconductor drum at the laser scanning position. This detector is employed to produce signals representing a latent image on the drum produced by sensing the change in charge on the drum when the latent image is scanned by the laser beam (26) in an unmodulated condition.
Inventors
- 👤 Thomas Herman Distefano
- 👤 Lawrence Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 14:36
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/221; G03G15/04; G03G15/04036; G03G15/04045; G03G15/04072; H; H04; H04N; H04N1/00; H04N1/024; H04N1/028
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
A xerographic printer/copier device comprising means (6) for forming an electrostatic latent image of an original document on a movable photoconductor surface (4) and scanning means (24, 25, 27, 28) for scanning said surface with a light beam (26) characterised by sensing means (30, 32, 34) arranged to detect changes in charge on said photoconductor surface when a latent image on the surface is scanned by said light beam, to produce electrical signals representing the pattern of said latent image.
Claim 2
Dependent Claim
80 words
A xerographic printer/copier device comprising means (6) for forming an electrostatic latent image of an original document on a movable photoconductor surface (4) and scanning means (24, 25, 27, 28) for scanning said surface with a light beam (26) characterised by sensing means (30, 32, 34) arranged to detect changes in charge on said photoconductor surface when a latent image on the surface is scanned by said light beam, to produce electrical signals representing the pattern of said latent image.
Claim 3
Dependent Claim
19 words
A xerographic printer/copier device as claimed in claim 1 characterised in that said light beam is a laser beam.
Claim 4
Dependent Claim
38 words
A xerographic printer/copier device as claimed in claim 1 or claim 2 characterised in that said sensing means includes an electrode (30) positioned adjacent the photoconductor surface and extending in the direction of scan of the light beam.
Claim 5
Dependent Claim
23 words
A xerographic printer/copier device as claimed in claim 3 characterised by a shield member (35) for shielding the electrode from environmental noise signals.
Claim 6
Dependent Claim
35 words
A xerographic printer/copier device as claimed in claim 4 characterised in that the electrode (30) and shield member (35) are of plate-like form and each includes a slot through which the scanning light beam passes.
Claim 7
Dependent Claim
32 words
A xerographic printer/copier device as claimed in claim 5 characterised in that said slot in the shield is configured to interrupt said light beam periodically as it scans across the photoconductor surface.
Claim 8
Dependent Claim
22 words
A xerographic printer/copier device as claimed in any of the previous claims characterised in that sensing means includes deconvolving and compensation circuits.
Claim 9
Dependent Claim
28 words
A xerographic printer/copier device as claimed in any of the previous claims characterised by an analog-digital converter (34) to produce, from the sensed signals, digital signals for storage.
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