Patent US4712852A successfully refreshed from Google Patents.
US4712852A
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Hologram disk for deflecting a light beam
Assignee: Ricoh Co Ltd
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Filing: 1986-06-03
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Granted: 1987-12-15
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Expires: 2006-06-03
Abstract
Abstract A hologram disk for deflecting a light beam in a hologram scanner includes a plurality of straight-line gratings formed by holograms in an annular pattern for deflecting the light beam. The line-to-line distance dθ between adjacent lines of each of said straight-line gratings is determined to meet, at least approximately, the following equation when said each straight-line grating is rotated through an angle θR: ##EQU1## where λ is the wavelength of the light beam and α is a proportionality constant. Therefore, the angle θs through which the light beam is deflected is expressed by θs=α·θR.
Inventors
- 👤 Hiroyoshi Funato
- 👤 Nobuo Banba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:58
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A hologram disk for deflecting a light beam in a hologram scanner, comprising a plurality of straight-line gratings formed by holograms in an annular pattern for deflecting the light beam, the line-to-line distance dθ between adjacent lines of each of said straight-line gratings being determined to meet, at least approximately, the following equation when said each straight-line grating is rotated through an angle θR: ##EQU16## where λ is the wavelength of the light beam and α is a proportionality constant, so that the angle θs through which the light beam is deflected can be expressed by θs=αθR.
Claim 2
Dependent Claim
97 words
A hologram disk for deflecting a light beam in a hologram scanner, comprising a plurality of straight-line gratings formed by holograms in an annular pattern for deflecting the light beam, the line-to-line distance dθ between adjacent lines of each of said straight-line gratings being determined to meet, at least approximately, the following equation when said each straight-line grating is rotated through an angle θR: ##EQU16## where λ is the wavelength of the light beam and α is a proportionality constant, so that the angle θs through which the light beam is deflected can be expressed by θs=αθR.
References Cited (Backward Citations)
US4487472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |