US5668623A
Expired / Lapsed
US
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Corneal shape measuring apparatus
Assignee: Topcon Corp
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Filing: 1994-07-18
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Granted: 1997-09-16
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Expires: 2014-07-18
Abstract
Abstract A corneal shape measuring apparatus includes a system 1 for concentrically projecting a plurality of ring images 6 onto a cornea C, a system 3 for receiving the ring images 6 projected onto the cornea C, and a multipoint detecting circuit 9 and a light emission controlling circuit 10 each for avoiding the overlap of adjacent ring images of the ring images 6 projected onto the cornea C.
Inventors
- 👤 Akio Sakurai
- 👤 Takeyuki Kato
- 👤 Minoru Kamiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:24
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/107
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
A corneal shape measuring apparatus comprising: a ring image projecting system for concentrically projecting a plurality of ring images onto a cornea at the same time, said ring images each having the same wavelength; a ring image receiving system for receiving the ring images projected on the cornea at the same time; judgment means for judging whether or not the ring images are overlapped by analyzing the ring images received by said ring image receiving system; and control means for controlling light emission from light sources which project the ring images when the ring images projected on the cornea are overlapped so that the ring images projected on the cornea are not overlapped based on a judgment result obtained by said judgment means; a shape of the cornea being measured based on the ring images received by said ring image receiving system through said judgment means and said control means.
Claim 2
Dependent Claim
150 words
A corneal shape measuring apparatus comprising: a ring image projecting system for concentrically projecting a plurality of ring images onto a cornea at the same time, said ring images each having the same wavelength; a ring image receiving system for receiving the ring images projected on the cornea at the same time; judgment means for judging whether or not the ring images are overlapped by analyzing the ring images received by said ring image receiving system; and control means for controlling light emission from light sources which project the ring images when the ring images projected on the cornea are overlapped so that the ring images projected on the cornea are not overlapped based on a judgment result obtained by said judgment means; a shape of the cornea being measured based on the ring images received by said ring image receiving system through said judgment means and said control means.
Claim 3
Dependent Claim
36 words
A corneal shape measuring apparatus according to claim 1, wherein said control means individually controls light emission from odd-numbered light sources of said light sources and light emission from even-numbered light sources of said light sources.
Claim 4
Dependent Claim
73 words
A corneal shape measuring apparatus comprising: a ring image projecting system for concentrically projecting a plurality of ring images onto a cornea at the same time, said ring images having wavelengths different from each other; and a ring image receiving system for receiving said ring images projected onto the cornea at the same time; a shape of the cornea being measured based on the ring images received by said ring image receiving system.
Claim 5
Dependent Claim
73 words
A corneal shape measuring apparatus comprising: a ring image projecting system for concentrically projecting a plurality of ring images onto a cornea at the same time, said ring images having wavelengths different from each other; and a ring image receiving system for receiving said ring images projected onto the cornea at the same time; a shape of the cornea being measured based on the ring images received by said ring image receiving system.
Claim 6
Dependent Claim
29 words
A corneal shape measuring apparatus according to claim 3 wherein said ring image receiving system separates the ring images according to their wavelengths and receives the separated ring images.
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) | 2000-09-15 | 2001-03-17 | 2001-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-15 | 2005-03-17 | 2005-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-15 | 2009-03-17 | 2009-09-16 | $7700.00 | Window Closed / Lapsed |