US5347364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Total reflection measuring apparatus
Assignee: Jasco Corp
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Filing: 1993-01-21
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Granted: 1994-09-13
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Expires: 2013-01-21
Abstract
Abstract A total reflection measuring apparatus having a cassegrain mirror which has cassegrain primary mirror and cassegrain secondary mirror focuses the light which is reflected by the above secondary mirror and the primary mirror on an object of measurement. A prism which is positioned in lower part of the above cassegrain secondary mirror and a prism lift which moves the prism between a shadow behind the cassegrain secondary mirror and the object. The prism lift positions the prism in the shadow behind the cassegrain secondary mirror when visual observation is required. As a result, the clear observation of object becomes possible.
Inventors
- 👤 Kazuhiko Kawasaki
- 👤 Tadashi Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:19
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/55; G01N21/552; G01N21/25; G01N21/31; G01N21/35; G01N2021/3595; G01N2201/00; G01N2201/06; G01N2201/063; G01N2201/0636
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A total reflection measuring apparatus comprising a cassegrain mirror which has a cassegrain primary mirror and a cassegrain secondary mirror, and which focuses light which is reflected by the secondary mirror and the primary mirror on an object to be measured; a prism positioned at a location behind said cassegrain secondary mirror; and a prism lifting means for lifting the prism between a shadow behind the cassegrain secondary mirror and the object to be measured.
Claim 2
Dependent Claim
75 words
A total reflection measuring apparatus comprising a cassegrain mirror which has a cassegrain primary mirror and a cassegrain secondary mirror, and which focuses light which is reflected by the secondary mirror and the primary mirror on an object to be measured; a prism positioned at a location behind said cassegrain secondary mirror; and a prism lifting means for lifting the prism between a shadow behind the cassegrain secondary mirror and the object to be measured.
Claim 3
Dependent Claim
62 words
A total reflection measuring apparatus according to claim 1, wherein said prism lifting means is provided with; a cylinder, a moving shaft which is inserted in the cylinder wherein said shaft moves in the cylinder, a prism holding board which is fixed on the bottom of the moving shaft, and a spring which pulls the moving shaft toward the cassegrain secondary mirror.
Claim 4
Dependent Claim
29 words
A total reflection measuring apparatus according to claim 1, wherein said prism lifting means is provided with; a stopper ring which positions the prism in contact with the object.
Claim 5
Dependent Claim
21 words
A total reflection measuring apparatus according to claim 1 further comprising a mask located between said secondary mirror and said prism.
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) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |