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US4964706A
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Multi-focal length, multi-field of view three mirror anastrigmat
Assignee: Raytheon Co
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Filing: 1988-10-17
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Granted: 1990-10-23
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Expires: 2008-10-17
Abstract
Abstract A three-mirror anastigmat system has a plurality of focal lengths, fields of view or both reflected to its focal planes. The system includes a positive power primary mirror (10) and a negative power secondary mirror (12) transmitting an image of an object to be viewed to a plurality of tertiary mirrors (14 and 16) operating at various magnifications. The tertiary mirrors (14 and 16) provide the plurality of images with different or the same focal lengths and fields of view to the plurality of focal planes (22 and 24).
Inventors
- 👤 Lacy G. Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:01
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B17/06; G02B17/0694
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
131 words
A three mirror anastigmat system comprising: a primary mirror having a central axis; a secondary mirror facing said primary mirror, said secondary mirror being of a smaller diameter than said primary mirror and positioned substantially symmetrically about said central axis of said primary mirror such that light from a viewed object passes around and by said secondary mirror and is reflected by said secondary mirror; and reflecting means for simultaneously reflecting light from the object being viewed to a plurality of planes for viewing, said reflecting means being positioned to receive light from said secondary mirror, said reflecting means including a plurality of tertiary mirrors of finite focal length and said plurality of tertiary mirrors forming a plurality of images of the object being viewed on said plurality of viewing planes.
Claim 2
Dependent Claim
131 words
A three mirror anastigmat system comprising: a primary mirror having a central axis; a secondary mirror facing said primary mirror, said secondary mirror being of a smaller diameter than said primary mirror and positioned substantially symmetrically about said central axis of said primary mirror such that light from a viewed object passes around and by said secondary mirror and is reflected by said secondary mirror; and reflecting means for simultaneously reflecting light from the object being viewed to a plurality of planes for viewing, said reflecting means being positioned to receive light from said secondary mirror, said reflecting means including a plurality of tertiary mirrors of finite focal length and said plurality of tertiary mirrors forming a plurality of images of the object being viewed on said plurality of viewing planes.
Claim 3
Dependent Claim
13 words
The system according to claim 1 wherein said primary mirror has positive power.
Claim 4
Dependent Claim
18 words
The system according to claim 1 wherein said primary mirror includes an opening central about said central axis.
Claim 5
Dependent Claim
13 words
The system according to claim 1 wherein said secondary mirror has negative power.
Claim 6
Dependent Claim
15 words
The system according to claim 1 wherein said plurality of tertiary mirrors have positive power.
Claim 7
Dependent Claim
18 words
The system according to claim 1 wherein said plurality of tertiary mirrors have substantially the same base radius.
Claim 8
Dependent Claim
17 words
The system according to claim 6 wherein said plurality of tertiary mirrors have different higher order departures.
Claim 9
Dependent Claim
131 words
A three mirror anastigmat system comprising: a primary mirror having a central axis; a secondary mirror facing said primary mirror, said secondary mirror being of a smaller diameter than said primary mirror and positioned substantially symmetrically about said central axis of said primary mirror such that light from a viewed object passes around and by said secondary mirror and is reflected by said secondary mirror; and reflecting means for simultaneously reflecting light from the object being viewed to a plurality of planes for viewing, said reflecting means being positioned to receive light from said secondary mirror, said reflecting means including a plurality of tertiary mirrors of finite focal length and said plurality of tertiary mirrors forming a plurality of images of the object being viewed on said plurality of viewing planes.
Claim 10
Dependent Claim
131 words
A three mirror anastigmat system comprising: a primary mirror having a central axis; a secondary mirror facing said primary mirror, said secondary mirror being of a smaller diameter than said primary mirror and positioned substantially symmetrically about said central axis of said primary mirror such that light from a viewed object passes around and by said secondary mirror and is reflected by said secondary mirror; and reflecting means for simultaneously reflecting light from the object being viewed to a plurality of planes for viewing, said reflecting means being positioned to receive light from said secondary mirror, said reflecting means including a plurality of tertiary mirrors of finite focal length and said plurality of tertiary mirrors forming a plurality of images of the object being viewed on said plurality of viewing planes.
Claim 11
Dependent Claim
13 words
The system according to claim 9 wherein said primary mirror has positive power.
Claim 12
Dependent Claim
18 words
The system according to claim 9 wherein said primary mirror includes an opening central about said central axis.
Claim 13
Dependent Claim
13 words
The system according to claim 8 wherein said secondary mirror has negative power.
Claim 14
Dependent Claim
15 words
The system according to claim 8 wherein said plurality of tertiary mirrors have positive power.
Claim 15
Dependent Claim
18 words
The system according to claim 8 wherein said plurality of tertiary mirrors have substantially the same base radius.
Claim 16
Dependent Claim
17 words
The system according to claim 13 wherein said plurality of tertiary mirrors have different higher order departures.
Claim 17
Dependent Claim
137 words
A three powered mirror anastigmat system comprising: a positive power primary mirror having a central axis; a negative power secondary mirror facing said positive primary mirror, said secondary mirror being of a smaller diameter than said primary mirror and positioned substantially symmetrically about said central axis of said primary mirror such that light from a viewed object passes around and by said secondary mirror and is reflected by said secondary mirror; and reflecting means for simultaneously reflecting light from the object being viewed to a plurality of planes for viewing, said reflecting means being positioned to receive light from said secondary mirror, said reflecting means including a plurality of tertiary mirrors of finite focal length and said plurality of tertiary mirrors forming a plurality of images of the object being viewed on said plurality of viewing planes.
Claim 18
Dependent Claim
137 words
A three powered mirror anastigmat system comprising: a positive power primary mirror having a central axis; a negative power secondary mirror facing said positive primary mirror, said secondary mirror being of a smaller diameter than said primary mirror and positioned substantially symmetrically about said central axis of said primary mirror such that light from a viewed object passes around and by said secondary mirror and is reflected by said secondary mirror; and reflecting means for simultaneously reflecting light from the object being viewed to a plurality of planes for viewing, said reflecting means being positioned to receive light from said secondary mirror, said reflecting means including a plurality of tertiary mirrors of finite focal length and said plurality of tertiary mirrors forming a plurality of images of the object being viewed on said plurality of viewing planes.
Claim 19
Dependent Claim
15 words
The system according to claim 15 wherein said plurality of tertiary mirrors are positive power.
Claim 20
Dependent Claim
18 words
The system according to claim 16 wherein said plurality of tertiary mirrors have substantially the same base radius.
Claim 21
Dependent Claim
17 words
The system according to claim 17 wherein said plurality of tertiary mirrors have different higher order departures.
References Cited (Backward Citations)
US4812030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |