US5383056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fourier transform lens assembly and optical information processor employing same
Assignee: Panasonic Holdings Corp
•
Filing: 1992-09-28
•
Granted: 1995-01-17
•
Expires: 2012-09-28
Abstract
Abstract A Fourier transform lens assembly suited for use in an optical information processor includes a first lens group having a positive power, a second lens group having a negative power disposed on one side of the first lens group, and a third lens group having a positive power disposed on the side opposite to the first lens group with respect to the second lens group. The distance between a front focal plane and a back focal plane of the Fourier transform lens assembly is less than two times a focal length of the Fourier transform lens assembly.
Inventors
- 👤 Kanji Nishii
- 👤 Masami Ito
- 👤 Atsushi Fukui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:56
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/46
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
175 words
An optical information processor comprising: a light source: a collimator lens for converting a beam emitted from said light source into a parallel beam; an afocal lens system for receiving the parallel beam from said collimator lens; a first spatial modulation element, disposed on one side of said afocal lens system, for displaying an input image; a mirror, disposed on the other side of said afocal lens system, for bending an optical path; a focal lens system disposed on the optical path bent by said mirror; and a second spatial modulation element for displaying spatial filters, said mirror, said focal lens system, and said second spatial modulation element being disposed in order along said optical path; wherein a Fourier transform optical system is constituted by said afocal lens system, said mirror, and said focal lens system; wherein said first spatial modulation element is located on a front focal plane of said Fourier transform optical system; and wherein said second spatial modulation element is located on a back focal plane of said Fourier transform optical system.
Claim 2
Dependent Claim
175 words
An optical information processor comprising: a light source: a collimator lens for converting a beam emitted from said light source into a parallel beam; an afocal lens system for receiving the parallel beam from said collimator lens; a first spatial modulation element, disposed on one side of said afocal lens system, for displaying an input image; a mirror, disposed on the other side of said afocal lens system, for bending an optical path; a focal lens system disposed on the optical path bent by said mirror; and a second spatial modulation element for displaying spatial filters, said mirror, said focal lens system, and said second spatial modulation element being disposed in order along said optical path; wherein a Fourier transform optical system is constituted by said afocal lens system, said mirror, and said focal lens system; wherein said first spatial modulation element is located on a front focal plane of said Fourier transform optical system; and wherein said second spatial modulation element is located on a back focal plane of said Fourier transform optical system.
Claim 3
Dependent Claim
36 words
The optical information processor according to claim 1, wherein said afocal lens system comprises a positive power lens group and a negative power lens group whereas said focal lens system comprises a positive power lens group.
Claim 4
Dependent Claim
64 words
The optical information processor according to claim 2, wherein said positive power lens group of said afocal lens system comprises a biconvex lens and a biconcave lens, wherein said negative power lens group of said afocal lens system comprises a pair of negative meniscus lenses, and wherein said positive power lens group of said focal lens system comprises a pair of positive meniscus lenses.
References Cited (Backward Citations)
US4189214A
Cited
DE2552263A1
Cited
EP0149118A2
Cited
JPS5821716A
Cited
US4831333A
Cited
JPH02132412A
Cited
US4997250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-16 | 1998-07-18 | 1999-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-16 | 2002-07-18 | 2003-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-16 | 2006-07-18 | 2007-01-17 | $7700.00 | Window Closed / Lapsed |