US4922309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectroscope
Assignee: Otsuka Electronics Co Ltd
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Filing: 1988-11-07
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Granted: 1990-05-01
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Expires: 2008-11-07
Abstract
Abstract An optical waveguide having a detour is disposed at either or both of the light-receiving and light-emitting ends of a dispersion optical system in a spectroscope. Even though light being propagated through the optical waveguide has specified polarizing characteristics, the light is depolarized by passing through the optical waveguide and many times reflecting therein. Accordingly, unpolarized light not affected by the polarization selectivity of the dispersion optical system or the like can be emitted from the spectroscope.
Inventors
- 👤 Mitsunao Sekiwa
- 👤 Tomohiro Akada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:21
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/02; G01J3/0205; G01J3/0218; G01J3/0224
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
76 words
A spectroscope for analyzing a sample, comprising: means for irradiating light on said sample; means for receiving and depolarizing reflected light from said sample, said depolarizing means comprising an optical wave guide in the form of a spiral such that light is multiply reflected in said wave guide so as to depolarize said light; and a dispersion optical system having a grating for emitting said depolarized light at every wavelength when said light is impinged thereto.
Claim 2
Dependent Claim
76 words
A spectroscope for analyzing a sample, comprising: means for irradiating light on said sample; means for receiving and depolarizing reflected light from said sample, said depolarizing means comprising an optical wave guide in the form of a spiral such that light is multiply reflected in said wave guide so as to depolarize said light; and a dispersion optical system having a grating for emitting said depolarized light at every wavelength when said light is impinged thereto.
Claim 3
Dependent Claim
18 words
A spectroscope according to claim 1 wherein said optical waveguide is in a form of an optical fiber.
References Cited (Backward Citations)
GB1335657A
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US4487504A
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GB2186363A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |