Patent US4896961A successfully refreshed from Google Patents.
US4896961A
Expired / Lapsed
US
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Particle analyzing apparatus
Assignee: Canon Inc
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Filing: 1989-06-15
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Granted: 1990-01-30
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Expires: 2009-06-15
Abstract
Abstract A particle analyzing apparatus has an irradiating optical system for irradiating a particle to be examined with a light beam, a measuring optical system for measuring the light scattered by the particle, a device provided in the irradiating optical system for varying the form of the light beam, and a device provided at a position in the measuring optical system optically conjugate with the position of the particle to be irradiated with the light beam and adapted for varying the form of viewing field when the form of the light beam is varied.
Inventors
- 👤 Yuji Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:52
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/14; G01N15/1456; G01N15/1459
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A particle analyzing apparatus, comprising: an irradiating optical system for irradiating a particle to be examined flowing one by one with a laser light beam; a measuring optical system for measuring at least fluorescent light received from the particle; a variable lens system for varying the form of the laser light beam provided in said irradiating optical system; and means for varying the form of a viewing field provided at a position in said measuring optical system optically conjugate with the position of the particle to be irradiated by the laser light beam and adapted to vary the form of the viewing field substantially simultaneously with a change in the form of the laser light beam.
Claim 2
Dependent Claim
116 words
A particle analyzing apparatus, comprising: an irradiating optical system for irradiating a particle to be examined flowing one by one with a laser light beam; a measuring optical system for measuring at least fluorescent light received from the particle; a variable lens system for varying the form of the laser light beam provided in said irradiating optical system; and means for varying the form of a viewing field provided at a position in said measuring optical system optically conjugate with the position of the particle to be irradiated by the laser light beam and adapted to vary the form of the viewing field substantially simultaneously with a change in the form of the laser light beam.
Claim 3
Dependent Claim
23 words
A particle analyzing apparatus according to claim 1 wherein said variable lens system is provided with plural lenses of respectively different focal lengths.
Claim 4
Dependent Claim
31 words
A particle analyzing apparatus according to claim 2 wherein said variable lens system comprises plural sets of beam diameter varying optical systems and cylindrical lens systems of respectively different focal lengths.
Claim 5
Dependent Claim
17 words
A particle analyzing apparatus according to claim 1, wherein said variable lens system comprises a zoom lens.
Claim 6
Dependent Claim
29 words
A particle analyzing apparatus according to claim 1, wherein said means for varying the form of viewing field is adapted to interchange plural diaphragms of respectively different aperture forms.
Claim 7
Dependent Claim
34 words
A particle analyzing apparatus according to claim 5, wherein said means for varying the form of viewing field is adapted to rotate a diaphragm plate provided with plural diaphragms of respectively different aperture forms.
Claim 8
Dependent Claim
40 words
A particle analyzing apparatus according to claim 6, wherein said diaphragm plate is rotated in response to the detection of a change in the form of the light beam by said means for varying the form of the light beam.
Claim 9
Dependent Claim
16 words
A particle analyzing apparatus according to claim 5, wherein said plural diaphragms comprise a rectangular aperture.
Claim 10
Dependent Claim
53 words
A particle analyzing apparatus according to claim 1, wherein, in response to the selection of a form by said variable lens system form of light beam, said means for varying the form of viewing field selects a viewing field of a form which is approximately equal to the form of said light beam.
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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |