US3784833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for deriving diffractive rays by diffraction gratings
Assignee: Olympus Corp
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Filing: 1972-07-11
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Granted: 1974-01-08
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Expires: 1992-07-11
Abstract
Abstract Apparatus for deriving diffractive rays by diffraction gratings which enables light measurement to be effected with high accuracy in addition to the feasibility of making the whole apparatus in a compact size. These features of the apparatus are obtained by the provision of a photoelectric element on the rear side of an index grating at a position in which it faces a movable scale grating with a small distance from this latter grating.
Inventors
- 👤 K Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:53
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
An apparatus for deriving diffractive rays by diffraction gratings, comprising a movable scale grating arranged in the foreground of a light source, said source including a plurality of luminous diodes arranged along said scale grating immediately adjacent thereto, an index grating fixed at a small distance from said scale grating and facing the latter grating, and a plurality of photoelectric elements arranged immediately behind said index grating and integrally fixed to the rear side thereof, said apparatus being arranged to be operative so that the light rays coming from said light source impinge directly onto said scale grating and that the light rays emitting from said index grating are received by said photoelectric elements.
Claim 2
Independent Claim
114 words
An apparatus for deriving diffractive rays by diffraction gratings, comprising a movable scale grating arranged in the foreground of a light source, said source including a plurality of luminous diodes arranged along said scale grating immediately adjacent thereto, an index grating fixed at a small distance from said scale grating and facing the latter grating, and a plurality of photoelectric elements arranged immediately behind said index grating and integrally fixed to the rear side thereof, said apparatus being arranged to be operative so that the light rays coming from said light source impinge directly onto said scale grating and that the light rays emitting from said index grating are received by said photoelectric elements.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |