US4474438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Space variant linear phase shifter for optical ambiguity function generator
Assignee: Honeywell Inc
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Filing: 1983-10-14
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Granted: 1984-10-02
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Expires: 2003-10-14
Abstract
Abstract This invention provides a simple and easily manufacturable lens apparatus, a space variant phase shifter, which is one of the key components in an optical ambiguity function generator. The improved lens apparatus is a combination of conventional optics comprising a cylindrical lens and a spherical lens in which the spherical lens is of opposite sign than the cylindrical lens and of one half the power.
Inventors
- 👤 Joseph J. Rebholz
- 👤 Poohsan N. Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:44
CPC Classifications
G; G06; G06E; G06E3/00; G06E3/001; G06E3/005; G01; G01S; G01S11/00; G01S11/02; G01S11/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
An optical linear phase shifter for use in an optical system having an x,y coordinate system, the phase shifter comprising: a cylindrical lens; a spherical lens having a sign opposite from that of the cylindrical lens and having a power of one-half that of the cylindrical lens; said cylindrical lens and spherical lens being in contact and forming a lens pair; and said cylindrical lens being rotated about the optical axis by 45° with respect to the x,y coordinate system to generate a complex transmissivity function of the lens pair.
Claim 2
Dependent Claim
90 words
An optical linear phase shifter for use in an optical system having an x,y coordinate system, the phase shifter comprising: a cylindrical lens; a spherical lens having a sign opposite from that of the cylindrical lens and having a power of one-half that of the cylindrical lens; said cylindrical lens and spherical lens being in contact and forming a lens pair; and said cylindrical lens being rotated about the optical axis by 45° with respect to the x,y coordinate system to generate a complex transmissivity function of the lens pair.
Claim 3
Dependent Claim
47 words
The linear phase shifter according to claim 1 wherein the complex transmissivity function of the lens pair is expressed by g(x,y)=e j αx'.spsp.2 e -j (α/2)r.spsp.2 where r=x 2 +y 2 and x',y' is a coordinate system that is rotated from the x,y coordinate sysstem by 45°.
Claim 4
Dependent Claim
32 words
The linear phase shifter according to claim 1 wherein the cylindrical lens and the spherical lens each have one plano side and wherein the plano sides of the lenses are fastened together.
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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |