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US4696545A
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Short focal length imaging device
Assignee: Xerox Corp
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Filing: 1985-08-15
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Granted: 1987-09-29
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Expires: 2005-08-15
Abstract
Abstract An imaging device is disclosed which comprises a noble metal photosensitive glass having formed on the surfaces a plurality of raised spherical surfaces which form an array of thick lenses. The array can be positioned between an object and image plane to project images from the object plane onto the image plane. Lens spherical aberrations are reduced and lens array imaging performance is optimized by an optimum lens aperture radius or an optimum lens numerical aperture.
Inventors
- 👤 William L. Lama
- 👤 Michael E. Harrigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:09
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/0006; G02B3/0012; G02B3/0018
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A short focal length imaging device for forming an erect 1:1 image of an object at an object plane on a photosensitive image plane, said device comprising a noble metal photosensitive glass having formed on the surfaces a plurality of raised spherical lenses, said imaging device having a vertex distance t defined by the expression: ##EQU9## where T is the device thickness, n is the refractive index of the glass and c is the curvature of each lens of the array and wherein the aperture of each lens of the array has an optimum radius h opt given by ##EQU10## where λ is the optical wavelength.
Claim 2
Dependent Claim
106 words
A short focal length imaging device for forming an erect 1:1 image of an object at an object plane on a photosensitive image plane, said device comprising a noble metal photosensitive glass having formed on the surfaces a plurality of raised spherical lenses, said imaging device having a vertex distance t defined by the expression: ##EQU9## where T is the device thickness, n is the refractive index of the glass and c is the curvature of each lens of the array and wherein the aperture of each lens of the array has an optimum radius h opt given by ##EQU10## where λ is the optical wavelength.
References Cited (Backward Citations)
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US3658407A
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US4168900A
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EP0133788A2
Cited
US4572611A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |