US3709602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical path length compensation in a copier
Assignee: Ricoh Co Ltd
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Filing: 1971-11-05
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Granted: 1973-01-09
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Expires: 1991-11-05
Abstract
Abstract An original placed on a transparent flat base is scanned by a rotary reflection mirror which directs light via a focusing lens and a second reflection mirror onto a photosensitive material. The difference in light path length caused by rotational scanning of the flat original is compensated for by moving the second reflection mirror and, in some embodiments, by movement also of the focusing lens or a zoom lens.
Inventors
- 👤 T Satomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:55
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
In apparatus for scanning a flat original utilizing a rotary reflection mirror, and including a second reflection mirror for receiving light from said rotary reflectiOn mirror and reflecting it onto a photosensitive material, the improvement comprising means for reciprocating said second reflection mirror in accordance with the movement of said rotary reflection mirror to vary the distance between said second reflection mirror and said photosensitive material in accordance with the varying distance between said rotary reflection mirror and the portion of said flat original scanned thereby.
Claim 2
Dependent Claim
86 words
In apparatus for scanning a flat original utilizing a rotary reflection mirror, and including a second reflection mirror for receiving light from said rotary reflectiOn mirror and reflecting it onto a photosensitive material, the improvement comprising means for reciprocating said second reflection mirror in accordance with the movement of said rotary reflection mirror to vary the distance between said second reflection mirror and said photosensitive material in accordance with the varying distance between said rotary reflection mirror and the portion of said flat original scanned thereby.
Claim 3
Dependent Claim
38 words
Apparatus according to claim 1, wherein said second reflection mirror is reciprocated substantially by a distance equal to one-half the difference between the longest distance and the shortest distance from said original surface to said rotary reflection mirror.
Claim 4
Dependent Claim
49 words
Apparatus according to claim 1, including a focusing lens for transmitting light from said rotary reflection mirror to said second reflection mirror, and means for moving said focusing lens in accordance with said varying distance between said rotary reflection mirror and the portion of said flat original scanned thereby.
Claim 5
Dependent Claim
62 words
Apparatus according to claim 3, wherein said reciprocating and moving means move said second reflection mirror and said focusing lens so that the light path between said focusing lens and the portion of said flat original that is scanned is substantially constant in length and the light path between said focusing lens and said photosensitive material is also substantially constant in length.
Claim 6
Dependent Claim
23 words
Apparatus according to claim 4, in which said light paths that are maintained substantially constant in length are substantially equal to each other.
Claim 7
Dependent Claim
42 words
Apparatus according to claim 4, in which said means for moving said focusing lens moves that lens through a distance substantially equal to the difference between the longest distance and the shortest distance from said original surface to said rotary reflection mirror.
Claim 8
Dependent Claim
28 words
Apparatus according to claim 6, in said reciprocating means moves said second reflection mirror through a distance substantially equal to one-half the distance said focusing lens is moved.
Claim 9
Dependent Claim
64 words
Apparatus according to claim 1, including a fixed focusing lens for transmitting light from said rotary reflection mirror to said second reflection mirror, a zoom lens positioned between said rotary reflection mirror and said fixed focusing lens, and means for moving said zoom lens in accordance with the varying distance between said rotary reflection mirror and the portion of said flat original scanned thereby.
Claim 10
Dependent Claim
18 words
Apparatus according to claim 1, including a focusing lens for transmitting light reflected from said second reflection mirror.
Claim 11
Dependent Claim
97 words
In apparatus for scanning a flat original fixed in position and having an exposure optical system that includes a rotary reflection mirror and a movable element for receiving light from said rotary reflection mirror and directing it onto a photosensitive material, the improvement comprising means for reciprocating said movable element in accordance with the movement of said rotary reflection mirror to render substantially constant the length of the path of light in said exposure optical system regardless of variations in distance between said rotary reflection mirror and the portion of said flat original that is scanned thereby.
Claim 12
Dependent Claim
97 words
In apparatus for scanning a flat original fixed in position and having an exposure optical system that includes a rotary reflection mirror and a movable element for receiving light from said rotary reflection mirror and directing it onto a photosensitive material, the improvement comprising means for reciprocating said movable element in accordance with the movement of said rotary reflection mirror to render substantially constant the length of the path of light in said exposure optical system regardless of variations in distance between said rotary reflection mirror and the portion of said flat original that is scanned thereby.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |