US4770478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrally selective shutter mechanism
Assignee: Aerospace Corp
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Filing: 1986-08-19
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Granted: 1988-09-13
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Expires: 2006-08-19
Abstract
Abstract A repetitive spectrally selective shutter apparatus which has a filter assembly in the space between a set of optics and the resultant focal plane is disclosed. The filter assembly consists of a narrowband filter mounted at an angle between the faces of two juxtaposed wedge-shaped faceplates. When rotated, this apparatus provides repetitive open periods in the narrow spectral bandpass as a function of the speed at which the filter assembly is rotated.
Inventors
- 👤 Edward F. Cross
- 👤 Gary D. Wiemokly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:31
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/02; G02B26/04; G01; G01J; G01J3/00; G01J3/12; G02B5/00; G02B5/005; G01J3/28; G01J3/42; G01J3/433; G01J2003/4332; G01J3/02; G01J3/0205; G01J3/0232
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
An opto-mechanical shutter apparatus, which comprises: a front wedge-shaped optical corrector faceplate and a rear wedge-shaped optical corrector faceplate; a first narrowband filter, having one face mounted on the slant face of said front faceplate and having the opposite face mounted on the juxtaposed slant face of said rear faceplate; a means for rotating said filter and said mounted faceplates along the optical axis between a set of focusing optics and the focal plane of said optics; and a second narrowband filter mounted on said optical axis proximate to said focal plane.
Claim 2
Dependent Claim
92 words
An opto-mechanical shutter apparatus, which comprises: a front wedge-shaped optical corrector faceplate and a rear wedge-shaped optical corrector faceplate; a first narrowband filter, having one face mounted on the slant face of said front faceplate and having the opposite face mounted on the juxtaposed slant face of said rear faceplate; a means for rotating said filter and said mounted faceplates along the optical axis between a set of focusing optics and the focal plane of said optics; and a second narrowband filter mounted on said optical axis proximate to said focal plane.
Claim 3
Dependent Claim
31 words
The apparatus claimed in claim 1 wherein the corrector faceplates are made of a material such as quartz that is highly refractive in the visible spectrum and has high transmission efficiency.
Claim 4
Dependent Claim
33 words
The apparatus claimed in claim 1 wherein the corrector faceplates are made of a material such as silicon or germanium which is highly refractive in the infrared spectrum and has high transmission efficiency.
Claim 5
Dependent Claim
17 words
The apparatus claimed in claim 1 wherein said rotating means rotates at about 30 revolutions per second.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |