Patent US3881801A successfully refreshed from Google Patents.
US3881801A
Expired / Lapsed
US
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Optical scanning system
Assignee: Linotype Co Ltd
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Filing: 1973-09-19
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Granted: 1975-05-06
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Expires: 1993-09-19
Abstract
Abstract An optical scanning system suitable for use, for example, in a phototypesetting machine. The system is capable of either scanning an object image across a planar surface or scanning a planar object and forming a stationary image thereof. The optical system includes, at successive positions along an optical path, an image-forming objective, a movable scanning mirror and an optical device having a curved optical surface for causing the optical system to satisfy the Petzval condition for a flat image surface notwithstanding changes in the angular position of the scanning mirror.
Inventors
- 👤 Edwin W Bechtold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:32
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; B; B41; B41B; B41B21/00; B41B21/16; B41B21/18; G03; G03B; G03B15/00; G03B17/00; G03B17/24; G03B17/245; G03B2217/00; G03B2217/24; G03B2217/242; G03B2217/243
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
190 words
An optical scanning system for arrangement between an object and a light-sensitive medium, said optical system comprising, in combination: a. an objective for forming an image of the object on the lightsensitive medium, the route of projected light from said object to said image defining an optical path having two ends; b. first mirror means arranged in said optical path between one end thereof and said objective, said first mirror means being selectively movable about a pivot axis for changing angularly the direction of the portion of said optical path between said one end and said first mirror means, the distance between said one end and said first mirror means thereby defining a radius of scan; and c. second mirror means arranged in said optical path between said one end thereof and said first mirror means, said second mirror means having a curved reflecting surface with a radius of curvature that is substantially twice said radius of scan; whereby the optical system satisfies the Petzval condition for a flat image surface so that movement of said first mirror means causes said one end of said optical path to move linearly.
Claim 2
Dependent Claim
190 words
An optical scanning system for arrangement between an object and a light-sensitive medium, said optical system comprising, in combination: a. an objective for forming an image of the object on the lightsensitive medium, the route of projected light from said object to said image defining an optical path having two ends; b. first mirror means arranged in said optical path between one end thereof and said objective, said first mirror means being selectively movable about a pivot axis for changing angularly the direction of the portion of said optical path between said one end and said first mirror means, the distance between said one end and said first mirror means thereby defining a radius of scan; and c. second mirror means arranged in said optical path between said one end thereof and said first mirror means, said second mirror means having a curved reflecting surface with a radius of curvature that is substantially twice said radius of scan; whereby the optical system satisfies the Petzval condition for a flat image surface so that movement of said first mirror means causes said one end of said optical path to move linearly.
Claim 3
Dependent Claim
25 words
The optical system defined in claim 1, wherein said first mirror means has a plane reflecting surface for deflecting projected light in said optical path.
Claim 4
Dependent Claim
22 words
The optical system defined in claim 1, wherein said curved reflecting surface of said second mirror means is a spherical reflecting surface.
Claim 5
Dependent Claim
60 words
The optical system defined in claim 1, further comprising a partial mirror arranged in said optical path between said first mirror means and said curved reflecting surface of said second mirror means, said partial mirror having a partially reflecting surface for deflecting projected light in the portion of said optical path between said one end and said curved reflecting surface.
Claim 6
Dependent Claim
50 words
The optical system defined in claim 1, wherein the object is arranged at said one end of said optical path and the light-sensitive medium is arranged at the opposite end thereof, whereby the object is scanned by the optical system and the object image is formed at the light-sensitive medium.
Claim 7
Dependent Claim
44 words
The optical system defined in claim 1, wherein the light-sensitive medium is arranged at said one end of said optical path and the object is arranged at the opposite end thereof, whereby the object image is formed at and scanned across the light-sensitive medium.
Claim 8
Dependent Claim
35 words
The optical system defined in claim 6 wherein the light-sensitive medium is a photographic strip and said optical system further includes means for longitudinally advancing said strip past said one end of said optical path.
Claim 9
Dependent Claim
46 words
The optical system defined in claim 7, further comprising d. a movable opaque strip having a plurality of transparent characters disposed thereon and repeatedly positionable at said opposite end of said optical path; and e. flash lamp means for selectively illuminating individual ones of saId characters.
Claim 10
Dependent Claim
27 words
The optical system defined in claim 1, wherein said reflecting surfce of said second mirror means is arranged substantially at said one end of said optical path.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |