US4346984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Document scanner
Assignee: Xerox Corp
•
Filing: 1980-10-20
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Granted: 1982-08-31
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Expires: 2000-10-20
Abstract
Abstract A lead screw is provided to move two or more document scanning elements at separate and differing rates of speed. In a preferred embodiment the lead screw consists of two threaded segments, each segment having a length and pitch which provides a 2:1 ratio of travel to a scan element threadingly engaged therein.
Inventors
- 👤 William Kingsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:24
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
An optical scanning system having at least two mirror assemblies mounted for independent movement beneath a document lying in an object plane, the scanning system further comprising means for driving said assemblies at different rates of speed, said driving means including a lead screw having along its length at least two threaded segments having a pitch differing one from the other, said mirror assemblies being each threadingly engaged with a separate threaded segment, and means for rotating said lead screw whereby each mirror assembly is advanced along said threaded segment at a rate of speed proportional to the velocity of said rotating means and the pitch of the respective threaded segment.
Claim 2
Dependent Claim
111 words
An optical scanning system having at least two mirror assemblies mounted for independent movement beneath a document lying in an object plane, the scanning system further comprising means for driving said assemblies at different rates of speed, said driving means including a lead screw having along its length at least two threaded segments having a pitch differing one from the other, said mirror assemblies being each threadingly engaged with a separate threaded segment, and means for rotating said lead screw whereby each mirror assembly is advanced along said threaded segment at a rate of speed proportional to the velocity of said rotating means and the pitch of the respective threaded segment.
Claim 3
Dependent Claim
55 words
The optical scanning system of claim 1 wherein a first mirror assembly scans the document and reflects the scanned image to a second mirror assembly, said second assembly being threadingly engaged to a lead screw segment having a pitch V2 of the pitch of the segment upon which the first mirror assembly is threadingly engaged.
Claim 4
Dependent Claim
123 words
A scanning system for incrementally scanning a document in an object plane, the system comprising a full rate scan mirror and a half rate mirror mounted respectively for independent movement on a first and second movable carriage disposed beneath said object plane, a lead screw having along its length a first threaded segment with a pitch P cm/rev and a second threaded segment with a pitch P/2/cm/rev, means for threadingly engaging said first carriage with said first threaded segment and said second carriage with said second threaded segment, and means for rotating said lead screw whereby each carriage is advanced along the respective shaft segment at a rate of speed proportional to the velocity of said rotating means and the respective segment pitch.
Claim 5
Dependent Claim
123 words
A scanning system for incrementally scanning a document in an object plane, the system comprising a full rate scan mirror and a half rate mirror mounted respectively for independent movement on a first and second movable carriage disposed beneath said object plane, a lead screw having along its length a first threaded segment with a pitch P cm/rev and a second threaded segment with a pitch P/2/cm/rev, means for threadingly engaging said first carriage with said first threaded segment and said second carriage with said second threaded segment, and means for rotating said lead screw whereby each carriage is advanced along the respective shaft segment at a rate of speed proportional to the velocity of said rotating means and the respective segment pitch.
Claim 6
Dependent Claim
15 words
The scanning system of claim 3 wherein said threadingly engaging means is a flexure nut.
Claim 7
Dependent Claim
16 words
The scanning system of claim 3 wherein said first and second threaded segments have different diameters.
Claim 8
Dependent Claim
32 words
The scanning system of claim 3 wherein scanned line images are transmitted along an optical path wherein a lens and beamsplitter mirror cooperate to project said line images onto photosensitive imaging arrays.
References Cited (Backward Citations)
US3029660A
Cited
US3422696A
Cited
US3369414A
Cited
US3659473A
Cited
US3752558A
Cited
US3775008A
Cited
US3987681A
Cited
US3788640A
Cited
US4110028A
Cited
US4093374A
Cited
US4120578A
Cited
US4155641A
Cited
US4149090A
Cited
US4142793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |