US3560651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical feedback for facsimile scanning system
Assignee: Xerox Corp
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Filing: 1967-11-08
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Granted: 1971-02-02
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Expires: 1987-11-08
Abstract
Abstract A facsimile scanning system utilizing a feedback system to drive the scan drum combined with a stepping motor to index between scan lines. In conjunction with an adaptive bandwidth compression technique, a mechanical feedback system is utilized for drum and reciprocal mirror synchronization. Where the stepping rate is a function of the document complexity, a stepping motor is provided for stepping the drum for lines of variable information density detected on the document. The scanning mirror and the drum are geared together through a gear train which tends to rotate the scan line on the drum surface without relative motion between the optical scan line and the actual image on the drum surface.
Inventors
- 👤 Charles T Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:50
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/41; H04N1/04; H04N1/17
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
150 words
A facsimile graphic communication system comprising: flying spot scanning means for scanning successive parallel line paths, the start of each of said line paths being adaptively controlled by the content of the information per scan line; mirror means for reflecting said flying spot scan; support means positioned to receive said reflected scan; drive means for driving said support means in a direction transverse to the direction of the scan lines; stepping means for indexing a said mirror means one scan line for each line to be scanned; and electromechanical feedback means coupled to said drive means, stepping means, and mirror means for rotating the scan line on the surface of said support means without relative motion between the scan lines and the line on the support means, whereby as said support means is driven said stepping means indexes said mirror means toward a position in accordance with said information content.
Claim 2
Dependent Claim
150 words
A facsimile graphic communication system comprising: flying spot scanning means for scanning successive parallel line paths, the start of each of said line paths being adaptively controlled by the content of the information per scan line; mirror means for reflecting said flying spot scan; support means positioned to receive said reflected scan; drive means for driving said support means in a direction transverse to the direction of the scan lines; stepping means for indexing a said mirror means one scan line for each line to be scanned; and electromechanical feedback means coupled to said drive means, stepping means, and mirror means for rotating the scan line on the surface of said support means without relative motion between the scan lines and the line on the support means, whereby as said support means is driven said stepping means indexes said mirror means toward a position in accordance with said information content.
Claim 3
Dependent Claim
59 words
The system as set forth in claim 1 further including: sensor means coupled to said mirror means for detecting predetermined first and second limits of moveMent thereof; and amplifier means coupled to said sensor means for speeding up or slowing down, respectively, said drive means in accordance with said first and second limits of movement of said mirror means.
Claim 4
Dependent Claim
58 words
The system as set forth in claim 2 wherein said electromechanical feedbacks means includes: first gear means coupled to said drive means for imparting said motion to said mirror means; and differential gear means coupled to said mirror means and said first gear means, said mirror means moving in response to said drive means and said stepping means.
Claim 5
Dependent Claim
34 words
The system as set forth in claim 3 wherein said support means is a xerographic drum upon which a latent image of a document or the like is formed by said flying spot scan.
Claim 6
Dependent Claim
33 words
The system as set forth in claim 3 wherein said support means is a drum upon which an original document or the like is scanned for conversion of optical information to electrical information.
Claim 7
Dependent Claim
39 words
The system as set forth in claim 3 wherein said support means is a flexible web upon which is an original or blank record member for transmitting or reproducing, respectively, the contents of an original document or the like.
Claim 8
Dependent Claim
47 words
The system as set forth in claim 2 wherein said electromagnetic feedback means includes: gear means coupled to said drive means for imparting said motion to said mirror means; and said stepping means mounted on a selected gear in said gear means for indexing said mirror means.
Claim 9
Dependent Claim
117 words
A facsimile graphic communication system comprising: scanning means for scanning successive parallel lines on a document or the like; support means for advancing said document in a transverse direction past said scanning means; variable speed drive means for driving said support means; stepping drive means for indexing said scanning means one scan line for each line to be scanned; and means coupled to said variable speed drive means and said stepping drive means for rotating the scan line on the surface of said document without relative motion between the scan line and the image on said document, whereby as said support means is rotated said stepping drive means indexes said scanning means toward an essentially stabilized position.
Claim 10
Dependent Claim
117 words
A facsimile graphic communication system comprising: scanning means for scanning successive parallel lines on a document or the like; support means for advancing said document in a transverse direction past said scanning means; variable speed drive means for driving said support means; stepping drive means for indexing said scanning means one scan line for each line to be scanned; and means coupled to said variable speed drive means and said stepping drive means for rotating the scan line on the surface of said document without relative motion between the scan line and the image on said document, whereby as said support means is rotated said stepping drive means indexes said scanning means toward an essentially stabilized position.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |