US3655284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Longitudinally insensitive lens strip imaging device
Assignee: Xerox Corp
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Filing: 1969-03-28
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Granted: 1972-04-11
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Expires: 1989-03-28
Abstract
Abstract Apparatus for projecting light images from an object towards an image surface. The apparatus includes a plurality of lens strips positioned to project the image at a l:l magnification. The first and third lens strips are of a common focal length while the lens strip therebetween is of a focal length half that of the other lens strips. This arrangement renders the apparatus insensitive to its longitudinal position along the optical path.
Inventors
- 👤 Thomas P Agliata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:10
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
180 words
A short focal length imaging device for projecting light rays from an object plane to an image plane at a 1:1 magnification including first transparent strip means having lens portions formed thereon optically positioned between the object and the image planes, second transparent strip means having lens portions formed thereon optically positioned between the object plane and said first strip means being adapted to invert and revert light rays received from the object plane and form an intermediate image thereof, third transparent strip means having lens portions formed thereon optically positioned between said first strip means and said image plane being adapted to invert and revert light rays of the intermediate image and to project an image thereof to said image plane, the lens portions of said second and third strip means being of equal focal length and said first strip means having its lens portion of a focal length half the focal length of the lens portions of said second and third strip means whereby the imaging device is insensitive to positioning between the object plane and image plane.
Claim 2
Dependent Claim
180 words
A short focal length imaging device for projecting light rays from an object plane to an image plane at a 1:1 magnification including first transparent strip means having lens portions formed thereon optically positioned between the object and the image planes, second transparent strip means having lens portions formed thereon optically positioned between the object plane and said first strip means being adapted to invert and revert light rays received from the object plane and form an intermediate image thereof, third transparent strip means having lens portions formed thereon optically positioned between said first strip means and said image plane being adapted to invert and revert light rays of the intermediate image and to project an image thereof to said image plane, the lens portions of said second and third strip means being of equal focal length and said first strip means having its lens portion of a focal length half the focal length of the lens portions of said second and third strip means whereby the imaging device is insensitive to positioning between the object plane and image plane.
Claim 3
Dependent Claim
31 words
The apparatus as set forth in claim 1 wherein the distance between the object plane and image plane is eight times the focal length of the second and third strip means.
References Cited (Backward Citations)
US2736235A
Cited
US3447438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |