Patent US2629496A successfully refreshed from Google Patents.
US4953979A
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Optical system for signal light detection in a flow particle analysis apparatus
Assignee: Omron Corp
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Filing: 1988-11-15
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Granted: 1990-09-04
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Expires: 2008-11-15
Abstract
Abstract An optical system for use in a flow particle detection apparatus is disclosed as having a light source for directing light onto flow partricles, a condenser lens for condensing signal light emitted from the flow particles, a photodetector for receiving signal light exiting from the condenser lens, an aperture provided between the condenser lens and the photodetector for removing undesired light, and a convergence-type collimating lens provided between the aperture and the photodetector, the aperture being disposed at a front focal position of the convergence-type collimating lens, and an exit pupil of the condenser lens and a photosensitive surface of the photodetector being located respectively at conjugate points of the convergence-type collimating lens.
Inventors
- 👤 Shinichi Hirako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:52
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/14; G01N15/1434; G01N15/1456; G01N15/1459
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
An optical system for signal light detection of a flow particle comprising: means for directing light onto flow particles flowing in a flow cell; a condenser lens for condensing signal light emitted from the flow particles, a photodetector for receiving signal light exiting from said condenser lens, an aperture provided between said condenser lens and said photodetector for removing undesired light, and a convergence-type collimating lens provided between said aperture and said photodetector, said aperture being disposed at a front focal position of said convergence-type collimating lens, and an exit pupil of said condenser lens and a photosensitive surface of said photodetector being located respectively at conjugate points of said convergence-type collimating lens, whereby the photosensitive surface of said photodetector is located at the image of said exit pupil.
Claim 2
Dependent Claim
129 words
An optical system for signal light detection of a flow particle comprising: means for directing light onto flow particles flowing in a flow cell; a condenser lens for condensing signal light emitted from the flow particles, a photodetector for receiving signal light exiting from said condenser lens, an aperture provided between said condenser lens and said photodetector for removing undesired light, and a convergence-type collimating lens provided between said aperture and said photodetector, said aperture being disposed at a front focal position of said convergence-type collimating lens, and an exit pupil of said condenser lens and a photosensitive surface of said photodetector being located respectively at conjugate points of said convergence-type collimating lens, whereby the photosensitive surface of said photodetector is located at the image of said exit pupil.
Claim 3
Dependent Claim
18 words
An optical system as in claim 1, wherein said light directing means comprises a source of laser light.
Claim 4
Dependent Claim
26 words
An optical system as in claim 1, further comprising a light filter provided between said convergence-type collimating lens and said photodetector for selectively transmitting light therethrough.
Claim 5
Dependent Claim
16 words
An optical system as in claim 1, wherein said convergence-type collimating lens is a single lens.
Claim 6
Dependent Claim
16 words
An optical system as in claim 1, wherein said convergence-type collimating lens is a compound lens.
References Cited (Backward Citations)
US4176960A
Cited
US4577964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |