Patent US5144346A successfully refreshed from Google Patents.
US5144346A
Expired / Lapsed
US
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Ophthalomological apparatus for alignment and refraction
Assignee: Canon Inc
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Filing: 1991-04-26
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Granted: 1992-09-01
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Expires: 2011-04-26
Abstract
Abstract An ophthalmological apparatus is arranged in such a manner that different measuring light sources are provided for an eye refractive power measuring system and a lens refractive power measuring system. A light sensor of the lens refractive power measuring system is commonly used as at least either the light sensor for an alignment observing system or the light sensor for the eye refractive power measuring system. A lens to be examined can be placed at a position which is different from a position where an eye to be examined is placed.
Inventors
- 👤 Yukitsugu Nakamura
- 👤 Yoshimi Kohayakawa
- 👤 Hiroshi Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:48
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/103
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
190 words
An ophthalmological apparatus comprising: an alignment observing system having a first light sensor which is substantially conjugate with an anterior eye portion of an eye to be examined; an eye refractive power measuring system having a first light source for projecting a beam to an eye fundus of the eye to be examined and arranged to measure a refractive power of the eye by receiving light reflected at the eye fundus by means of a second light sensor; means for holding a lens to be examined at a position which is different from a position where the eye to be examined is placed; and a lens refractive power measuring system having a second light source for projecting a beam to a lens to be examined and arranged to measure a lens refractive power by receiving the beam from said second light source which passes through said lens, by means of a third light sensor, wherein said first light source and said second light source are different from each other and said third light sensor is commonly used with at least either said first light sensor or said second light sensor.
Claim 2
Dependent Claim
190 words
An ophthalmological apparatus comprising: an alignment observing system having a first light sensor which is substantially conjugate with an anterior eye portion of an eye to be examined; an eye refractive power measuring system having a first light source for projecting a beam to an eye fundus of the eye to be examined and arranged to measure a refractive power of the eye by receiving light reflected at the eye fundus by means of a second light sensor; means for holding a lens to be examined at a position which is different from a position where the eye to be examined is placed; and a lens refractive power measuring system having a second light source for projecting a beam to a lens to be examined and arranged to measure a lens refractive power by receiving the beam from said second light source which passes through said lens, by means of a third light sensor, wherein said first light source and said second light source are different from each other and said third light sensor is commonly used with at least either said first light sensor or said second light sensor.
Claim 3
Dependent Claim
26 words
An ophthalmological apparatus according to claim 1, wherein said third light sensor is non-conjugate with a position at which said lens to be examined is placed.
Claim 4
Dependent Claim
25 words
An ophthalmological apparatus according to claim 1, wherein said first, second and third light sensors are composed of a light sensor which is commonly used.
Claim 5
Dependent Claim
35 words
An ophthalmological apparatus according to claim 1, further comprising a display monitor which is connected to said commonly used third light sensor, said display monitor having a positioning mark formed on a predetermined portion thereof.
Claim 6
Dependent Claim
22 words
An ophthalmological apparatus according to claim 1, wherein said alignment observing system has a light source for illuminating the anterior eye portion.
Claim 7
Dependent Claim
34 words
An ophthalmological apparatus according to claim 1, wherein said lens refractive power measuring system has a relay optical system between said third light sensor and said means for holding said lens to be examined.
Claim 8
Dependent Claim
31 words
An ophthalmological apparatus according to claim 5, wherein at least a portion of an optical path for said lens refractive power measuring system is commonly used by said alignment observing system.
Claim 9
Dependent Claim
36 words
An ophthalmological apparatus according to claim 7 further comprising light selection means for selectively transmitting only light emitted from said light source for illuminating the anterior eye portion and light emitted from said second light source.
Claim 10
Dependent Claim
17 words
An ophthalmological apparatus according to claim 8, wherein said light selection means is a wavelength selection filter.
Claim 11
Dependent Claim
26 words
An ophthalmological apparatus according to claim 8, wherein said light selection means is a light shielding plate which can be freely inserted/retracted into/from a optical path.
Claim 12
Dependent Claim
43 words
An ophthalmological apparatus according to claim 1, wherein said alignment observing system has a display monitor which is commonly used to observe an alignment of said eye refractive power measuring system and to observe an alignment of said lens refractive power measuring system.
Claim 13
Dependent Claim
79 words
An ophthalmological apparatus according to claim 5, further comprising wavelength selection means for connecting an optical path for said lens refractive power measuring system to an optical path of said alignment observing system, permitting a wavelength of light emitted from said second light source to be the same as that of light emitted from said light source for illuminating the anterior eye portion, and transmitting only light of said wavelength along the optical path of said alignment observing system.
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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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |