US4690525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eye fundus camera
Assignee: Canon Inc
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Filing: 1984-12-17
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Granted: 1987-09-01
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Expires: 2004-12-17
Abstract
Abstract An eye fundus camera is provided with an illuminating system for illuminating an eye to be examined, a photographing system for photographing the fundus of the eye to be examined, eye fundus reflected light receiving portions disposed in a plane substantially conjugate with the fundus of the eye to be examined and at a plurality of locations with a spacing greater than the dimension corresponding to the nipple diameter, and a control unit for operation-processing the outputs of the eye fundus reflected light receiving portions and automatically controlling the quantity of photo-taking light.
Inventors
- 👤 Kazunobu Kobayashi
- 👤 Kyoji Sekiguchi
- 👤 Isao Matsumura
- 👤 Haruhisa Madate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:49
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
An eye fundus camera having: an illuminating system for illuminating an eye to be examined; a photographing system for photographing the fundus of the eye to be examined; light receiving portions comprising multiple spots for receiving the reflected light from the eye fundus illuminated by said illuminating system, said light receiving portions being disposed in a plane substantially optically conjugate with the fundus of the eye to be examined, the spacing between each two adjacent spots being greater than a length corresponding to a diameter of the optic disk of the eye fundus; and a control unit for processing the outputs of said light receiving portions to restrict influence of the optic disk, and automatically controlling the quantity of photographing light.
Claim 2
Dependent Claim
121 words
An eye fundus camera having: an illuminating system for illuminating an eye to be examined; a photographing system for photographing the fundus of the eye to be examined; light receiving portions comprising multiple spots for receiving the reflected light from the eye fundus illuminated by said illuminating system, said light receiving portions being disposed in a plane substantially optically conjugate with the fundus of the eye to be examined, the spacing between each two adjacent spots being greater than a length corresponding to a diameter of the optic disk of the eye fundus; and a control unit for processing the outputs of said light receiving portions to restrict influence of the optic disk, and automatically controlling the quantity of photographing light.
Claim 3
Dependent Claim
28 words
An eye fundus camera according to claim 1, wherein said control unit time-integrates the outputs of said light receiving portions and automatically controls the quantity of photographing light.
Claim 4
Dependent Claim
38 words
An eye fundus camera according to claim 1, wherein said control unit introduces thereinto a detection signal other than a detection signal which represents the maximum reflected light received at any one spot of said light receiving portions.
Claim 5
Dependent Claim
127 words
An eye fundus camera having: an illuminating system for illuminating an eye to be examined; a variable magnification photographing system for photographing the fundus of the eye to be examined at a variable magnification; light receiving portions comprising multiple spots for receiving the reflected light from the eye fundus illuminated by said illuminating system, said light receiving portions being disposed in a plane substantially optically conjugate with the fundus of the eye to be examined, the spacing between each two adjacent spots being greater than a length corresponding to a diameter of the optic disk of the eye fundus; and a control unit for processing the outputs of said light receiving portions to restrict influence of the optic disk, and automatically controlling the quantity of photographing light.
Claim 6
Dependent Claim
127 words
An eye fundus camera having: an illuminating system for illuminating an eye to be examined; a variable magnification photographing system for photographing the fundus of the eye to be examined at a variable magnification; light receiving portions comprising multiple spots for receiving the reflected light from the eye fundus illuminated by said illuminating system, said light receiving portions being disposed in a plane substantially optically conjugate with the fundus of the eye to be examined, the spacing between each two adjacent spots being greater than a length corresponding to a diameter of the optic disk of the eye fundus; and a control unit for processing the outputs of said light receiving portions to restrict influence of the optic disk, and automatically controlling the quantity of photographing light.
Claim 7
Dependent Claim
120 words
An eye fundus camera capable of fluorescence photography and normal photography, said camera having: an illuminating system for photographing the fundus of the eye to be examined; light receiving portions comprising multiple spots for receiving the reflected light from the eye fundus illuminated by said illuminating system, said light receiving portions being disposed in a plane substantially optically conjugate with the fundus of the eye to be examined, the spacing between each two adjacent spots being greater than a length corresponding to a diameter of the optic disk of the eye fundus; and a control unit for processing the outputs of said light receiving portions to restrict influence of the optic disk, and automatically controlling the quantity of photographing light.
Claim 8
Dependent Claim
120 words
An eye fundus camera capable of fluorescence photography and normal photography, said camera having: an illuminating system for photographing the fundus of the eye to be examined; light receiving portions comprising multiple spots for receiving the reflected light from the eye fundus illuminated by said illuminating system, said light receiving portions being disposed in a plane substantially optically conjugate with the fundus of the eye to be examined, the spacing between each two adjacent spots being greater than a length corresponding to a diameter of the optic disk of the eye fundus; and a control unit for processing the outputs of said light receiving portions to restrict influence of the optic disk, and automatically controlling the quantity of photographing light.
Claim 9
Dependent Claim
102 words
An eye fundus camera having: an illuminating system for illuminating an eye to be examined; and a photographing system for photographing the fundus of the eye to be examined; light receiving portions including multiple spots for receiving the reflected light from the eye fundus illuminated by said illuminating system, said light receiving portions being disposed in a plane substantially optically conjugate with the fundus of the eye to be examined, the spacing between each two adjacent spots being so determined that no more than one of said spots is influenced by the reflected light from the optic disk of the eye fundus.
Claim 10
Dependent Claim
102 words
An eye fundus camera having: an illuminating system for illuminating an eye to be examined; and a photographing system for photographing the fundus of the eye to be examined; light receiving portions including multiple spots for receiving the reflected light from the eye fundus illuminated by said illuminating system, said light receiving portions being disposed in a plane substantially optically conjugate with the fundus of the eye to be examined, the spacing between each two adjacent spots being so determined that no more than one of said spots is influenced by the reflected light from the optic disk of the eye fundus.
References Cited (Backward Citations)
US4429970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |