Patent US4330688A successfully refreshed from Google Patents.
US4429970A
Expired / Lapsed
US
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Illuminating light amount controllable retinal camera
Assignee: Olympus Corp
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Filing: 1982-04-27
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Granted: 1984-02-07
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Expires: 2002-04-27
Abstract
Abstract A retinal camera wherein the illuminating light amount to the retina is made controllable so as to be of a proper value to make it possible to always obtain a retinal photograph of a proper exposure.
Inventors
- 👤 Hiroshi Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:04
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
A retinal camera comprising a light receiving element which can receive a part of the light from the retina and an illuminating light source which is arranged to illuminate said retina and can have the emitted light amount controlled on the basis of the light amount detected by said light receiving element, the light measuring range of said retina being made at least 2.5 times as large in the diameter as the nipple of the retina.
Claim 2
Dependent Claim
76 words
A retinal camera comprising a light receiving element which can receive a part of the light from the retina and an illuminating light source which is arranged to illuminate said retina and can have the emitted light amount controlled on the basis of the light amount detected by said light receiving element, the light measuring range of said retina being made at least 2.5 times as large in the diameter as the nipple of the retina.
Claim 3
Dependent Claim
48 words
A retinal camera according to claim 1 wherein said retinal camera further comprises a light receiving lens and stop arranged in front of said light receiving element and said light measuring range is determined by the magnification of said light receiving lens and the diameter of said stop.
Claim 4
Dependent Claim
56 words
A retinal camera according to claim 1 or 2 wherein said retinal camera further comprises an integrating section connected to said light receiving element, a control section connected to said integrating section and a light emission control section connected to said control section and said light emission control section is connected to said illuminating light source.
Claim 5
Dependent Claim
17 words
A retinal camera according to claim 3 wherein said illuminating light source is a photographing light source.
Claim 6
Dependent Claim
17 words
A retinal camera according to claim 3 wherein said illuminating light source is an observing light source.
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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |