Patent US4867554A successfully refreshed from Google Patents.
US4867554A
Expired / Lapsed
US
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Surface examining apparatus
Assignee: Canon Inc
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Filing: 1988-01-21
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Granted: 1989-09-19
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Expires: 2008-01-21
Abstract
Abstract A surface examining apparatus in which a surface to be examined is scanned by a light, whereby scanning position information, depth information and reflected light amount information are obtained and at least the image of the surface to be examined is displayed on the basis of such information.
Inventors
- 👤 Isao Matsumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:10
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/13
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
252 words
An eye surface examining apparatus comprising: a light source for scanning the eye surface to be examined through a lght projection portion of an anterior part of the eye to be examined; a light-receiving optical sysstem for receiving reflected light from the eye surface to be examined, said light receiving optical system having a stop provided with a lighttransmitting portion for transmitting the reflected light from the eye surface therethrough, said stop being disposed at a position in a plane substantially conjugate with the anterior part of the eye, a portion corresponding to said light transmitting portion in the anterior part of the eye being disposed at a position different from said light projection portion; light position detecting means provided substantially with the eye surface to be examined with respect to said light-receiving optical system for detecting information concerning the depth of the surface to be examined at each scanning position on the basis of a position of incidence of the scanning light reflected from the eye surface to be examined by way of said stop; scanning position detecting means for detecting each scanning position on the eye surface to be examined; light amount detecting means for detecting the scanning light amount reflected from each scanning position in the surface to be examined; and image display means for displaying at least the image of the eye surface to be examined on the basis of the outputs of said light position detecting means, said scanning position detecting means, said light amount detecting means.
Claim 2
Dependent Claim
252 words
An eye surface examining apparatus comprising: a light source for scanning the eye surface to be examined through a lght projection portion of an anterior part of the eye to be examined; a light-receiving optical sysstem for receiving reflected light from the eye surface to be examined, said light receiving optical system having a stop provided with a lighttransmitting portion for transmitting the reflected light from the eye surface therethrough, said stop being disposed at a position in a plane substantially conjugate with the anterior part of the eye, a portion corresponding to said light transmitting portion in the anterior part of the eye being disposed at a position different from said light projection portion; light position detecting means provided substantially with the eye surface to be examined with respect to said light-receiving optical system for detecting information concerning the depth of the surface to be examined at each scanning position on the basis of a position of incidence of the scanning light reflected from the eye surface to be examined by way of said stop; scanning position detecting means for detecting each scanning position on the eye surface to be examined; light amount detecting means for detecting the scanning light amount reflected from each scanning position in the surface to be examined; and image display means for displaying at least the image of the eye surface to be examined on the basis of the outputs of said light position detecting means, said scanning position detecting means, said light amount detecting means.
Claim 3
Dependent Claim
27 words
An eye surface examining apparatus according to claim 1, wherein said light amount detecting means is substantially conjugate with the pupil of the eye to be examined.
Claim 4
Dependent Claim
23 words
An eye surface examining apparatus according to claim 1, wherein said light position detecting means is a two-dimensional solid state image pick-up element.
Claim 5
Dependent Claim
23 words
An eye surface examining apparatus according to claim 1, wherein said light position detecting means serves also as said light amount detecting means.
Claim 6
Dependent Claim
23 words
An eye surface examining apparatus according to claim 1, wherein said light position detecting means serves also as said scanning position detecting means.
Claim 7
Dependent Claim
35 words
An eye surface examining apparatus according to claim 1, wherein said image display means displays the image of the eye surface to be examined and the depth distribution of the eye surface to be examined.
Claim 8
Dependent Claim
31 words
An eye surface examining apparatus according to claim 6, wherein said image display means further displays that portion of the eye surface to be examined that said depth distribution corresponds to.
Claim 9
Dependent Claim
39 words
An eye surface examining apparatus according to claim 1, wherein said image display means displays the image of the eye surface to be examined corrected on the basis of the depth distribution of the eye surface to be examined.
Claim 10
Dependent Claim
16 words
An eye surface examining apparatus according to claim 1, wherein said stop has two lighttransmitting portions.
Claim 11
Dependent Claim
38 words
An eye surface examining apparatus according to claim 9, wheein said image display means displays two images o the surface to be examined for stereoscopic observation by the use of light beams passed through the respective light-transmitting portions.
Claim 12
Dependent Claim
18 words
An eye surface examining apparatus according to claim 1, wherein said stop is rotatable about the optic axis.
Claim 13
Dependent Claim
21 words
An eye surface examining apparatus according to claim 1, wherein said light source scanning means is a cathode ray tube scanner.
Claim 14
Dependent Claim
20 words
An eye surface examining apparatus according to claim 1, wherein the surface to be examined is an eye fundus surface.
Claim 15
Dependent Claim
215 words
An eye surface examining apparatus comprising; a light source for scanning the eye surface to be examined through a light projection portion of an anterior part of the eye to be examined; a light-receiving optical system for receiving reflected light from the eye surface to be examined, said light receiving optical system having a stop provided with a light-transmitting portion for transmitting the reflected light from the eye surface therethrough, said stop being disposed at a position in a plane substantially conjugate with the anterior part of the eye, a portion corresponding to said light transmitting portion in the anterior part of the eye being disposed at a position different from said light projection portion; light position detecting means provided substantially conjugate with the eye surface to be examined with respect to said light-receiving optical system for detecting information concerning the depth of the surface to be examined at each scanning position on the basis of a position of incidence of the scanning light by way of said stop reflected from the eye surface to be examined; scanning position detecting means for detecting each scanning position on the eye surface to be examined; and light amount detecting means for detecting the scanning light amount reflected from each scanning position in the surface to be examined.
Claim 16
Dependent Claim
215 words
An eye surface examining apparatus comprising; a light source for scanning the eye surface to be examined through a light projection portion of an anterior part of the eye to be examined; a light-receiving optical system for receiving reflected light from the eye surface to be examined, said light receiving optical system having a stop provided with a light-transmitting portion for transmitting the reflected light from the eye surface therethrough, said stop being disposed at a position in a plane substantially conjugate with the anterior part of the eye, a portion corresponding to said light transmitting portion in the anterior part of the eye being disposed at a position different from said light projection portion; light position detecting means provided substantially conjugate with the eye surface to be examined with respect to said light-receiving optical system for detecting information concerning the depth of the surface to be examined at each scanning position on the basis of a position of incidence of the scanning light by way of said stop reflected from the eye surface to be examined; scanning position detecting means for detecting each scanning position on the eye surface to be examined; and light amount detecting means for detecting the scanning light amount reflected from each scanning position in the surface to be examined.
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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |