Patent US3704657A successfully refreshed from Google Patents.
US3704657A
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Adaptive optical focusing system
Assignee: Prime Computer Inc
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Filing: 1971-05-05
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Granted: 1972-12-05
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Expires: 1991-05-05
Abstract
Abstract An adaptive optical focusing system which utilizes two relatively movable lenses and a servo gauging system to maintain one of the lenses at a fixed distance from a photosensitive medium. An illuminated object or light aperture is located at the focal point of the first lens. The second movable lens is positioned to intercept the collimated light rays from the first lens and to focus the image of the light aperture on the photosensitive medium. A servo gauging system maintains the second lens at a distance from the photosensitive medium which corresponds to the focal length of the second lens.
Inventors
- 👤 Joseph J Sliwkowski
- 👤 Gilbert Fryklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:20
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
133 words
In a photoplotter having a light source and a light aperture, an adaptive focusing optical system for imaging the light aperture on a photosensitive medium, said adaptive focusing system comprising: 1. a first light converging lens means positioned away from said light aperture at a distance equal to the focal length of said lens means so that the light aperture is at the focal point thereof; 2. a movable second light converging lens means positioned to intercept the collimated light rays from said first light converging lens means, said second light converging lens means focusing the image of said light aperture on the photosensitive medium; and, 3. means for maintaining said second light converging lens means at a distance from said photosensitive medium which equals the focal length of said second lens means.
Claim 2
Dependent Claim
133 words
In a photoplotter having a light source and a light aperture, an adaptive focusing optical system for imaging the light aperture on a photosensitive medium, said adaptive focusing system comprising: 1. a first light converging lens means positioned away from said light aperture at a distance equal to the focal length of said lens means so that the light aperture is at the focal point thereof; 2. a movable second light converging lens means positioned to intercept the collimated light rays from said first light converging lens means, said second light converging lens means focusing the image of said light aperture on the photosensitive medium; and, 3. means for maintaining said second light converging lens means at a distance from said photosensitive medium which equals the focal length of said second lens means.
Claim 3
Dependent Claim
39 words
a movable second light converging lens means positioned to intercept the collimated light rays from said first light converging lens means, said second light converging lens means focusing the image of said light aperture on the photosensitive medium; and,
Claim 4
Dependent Claim
39 words
a movable second light converging lens means positioned to intercept the collimated light rays from said first light converging lens means, said second light converging lens means focusing the image of said light aperture on the photosensitive medium; and,
Claim 5
Dependent Claim
14 words
The adaptive focusing optical system of claim 1 wherein said distance maintaining means includes:
Claim 6
Dependent Claim
21 words
means responsive to said gauging signal for producing a correction signal whenever said gauging signal departs from a reference point; and,
Claim 7
Dependent Claim
21 words
means responsive to said gauging signal for producing a correction signal whenever said gauging signal departs from a reference point; and,
Claim 8
Dependent Claim
26 words
means for maintaining said second light converging lens means at a distance from said photosensitive medium which equals the focal length of said second lens means.
Claim 9
Dependent Claim
26 words
means for maintaining said second light converging lens means at a distance from said photosensitive medium which equals the focal length of said second lens means.
Claim 10
Dependent Claim
16 words
The adaptive focusing system of claim 2 wherein said gauging means comprises a non-contact pneumatic gauge.
Claim 11
Dependent Claim
27 words
means responsive to said correction signal for moving said second light converging lens means and said gauging means until said gauging signal returns to said reference point.
Claim 12
Dependent Claim
27 words
means responsive to said correction signal for moving said second light converging lens means and said gauging means until said gauging signal returns to said reference point.
Claim 13
Dependent Claim
16 words
The adaptive focusing system of claim 2 wherein said gauging means comprises a non-contact light gauge.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |