US3720466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slit exposure optical system for reproducing apparatus or the like
Assignee: Ricoh Co Ltd
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Filing: 1970-04-30
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Granted: 1973-03-13
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Expires: 1990-04-30
Abstract
Abstract A slit exposure optical system for use in a reproducing apparatus having a fixed projection lens for projecting a scanned image of the object on a photoreceptor and a mirror arrangement for scanning the object including only two movable mirrors disposed between the projection lens and the object. The first movable mirror is disposed transversely to the optical axis of the projection lens and the plane of the object and the second movable mirror is disposed to face the first movable mirror and the object and is moved at twice the speed of the first movable mirror.
Inventors
- 👤 Y Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:18
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A slit exposure optical system for a reproducing apparatus or the like which includes a photoreceptor for receiving a light image of an object to be reproduced, comprising a fixed projection lens, a first movable mirror mounted on an optical path of said lens and disposed transversely to the optical axis thereof, and a second movable mirror inclined to said first movable mirror and facing both said first movable mirror and an object receiving position, said second movable mirror being mounted for movement parallel to said optical axis at a speed corresponding to the moving speed of said photoreceptor, and means for moving said first movable mirror in the same direction as said second movable mirror at one half of the speed of said second movable mirror, so that the length of the optical path from said lens to said object is always kept equal with that from said lens to said photoreceptor.
Claim 2
Dependent Claim
153 words
A slit exposure optical system for a reproducing apparatus or the like which includes a photoreceptor for receiving a light image of an object to be reproduced, comprising a fixed projection lens, a first movable mirror mounted on an optical path of said lens and disposed transversely to the optical axis thereof, and a second movable mirror inclined to said first movable mirror and facing both said first movable mirror and an object receiving position, said second movable mirror being mounted for movement parallel to said optical axis at a speed corresponding to the moving speed of said photoreceptor, and means for moving said first movable mirror in the same direction as said second movable mirror at one half of the speed of said second movable mirror, so that the length of the optical path from said lens to said object is always kept equal with that from said lens to said photoreceptor.
Claim 3
Dependent Claim
153 words
A slit exposure optical system for a reproducing apparatus or the like which includes a photoreceptor for receiving a light image of an object to be reproduced, comprising a fixed projection lens, a first movable mirror mounted on an optical path of said lens and disposed transversely to the optical axis thereof, and a second movable mirror inclined to said first movable mirror and facing both said first movable mirror and an object receiving position, said second movable mirror being mounted for movement parallel to said optical axis at a speed corresponding to the moving speed of said photoreceptor, and means for moving said first movable mirror in the same direction as said second movable mirror at one half of the speed of said second movable mirror, so that the length of the optical path from said lens to said object is always kept equal with that from said lens to said photoreceptor.
Claim 4
Dependent Claim
153 words
A slit exposure optical system for a reproducing apparatus or the like which includes a photoreceptor for receiving a light image of an object to be reproduced, comprising a fixed projection lens, a first movable mirror mounted on an optical path of said lens and disposed transversely to the optical axis thereof, and a second movable mirror inclined to said first movable mirror and facing both said first movable mirror and an object receiving position, said second movable mirror being mounted for movement parallel to said optical axis at a speed corresponding to the moving speed of said photoreceptor, and means for moving said first movable mirror in the same direction as said second movable mirror at one half of the speed of said second movable mirror, so that the length of the optical path from said lens to said object is always kept equal with that from said lens to said photoreceptor.
Claim 5
Dependent Claim
27 words
A slit exposure optical system as defined in claim 1 wherein said first movable mirror is disposed transversely to the plane of the object to be reproduced.
Claim 6
Dependent Claim
29 words
A slit exposure optical system as defined in claim 2 wherein said first and second movable mirrors are positioned between said fixed projection lens and the object receiving position.
Claim 7
Dependent Claim
36 words
A slit exposure optical system as defined in claim 3 wherein said first and second movable mirrors are mounted for movement from a first position toward said fixed projection lens during the scanning of said object.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |