US4526450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eye fundus camera
Assignee: Topcon Corp
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Filing: 1983-09-16
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Granted: 1985-07-02
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Expires: 2003-09-16
Abstract
Abstract An eye fundus camera adapted to be mounted with a first (12) and a second (20; 26, 27) apparatus for observing and/or photographing the eye fundus, and including a movable mirror (18) moved between a first position where it admits light from the eye fundus to the first apparatus (12) and a second position where it deflects the light toward the second apparatus (20; 26, 27), whereby various modes of operation can be carried out.
Inventors
- 👤 Toru Suzuki
- 👤 Eiichi Sano
- 👤 Yoshihiko Hanamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:34
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
289 words
An eye fundus camera comprising: an illuminating optical system for illuminating the fundus of the eye to be inspected; an image forming optical system having a first path of light in which the rays of light from the fundus of the eye can travel for forming an image of the fundus of the eye; a movable reflecting member movable betwen a first position within said first path of light and a second position outside of said first path of light, said reflecting member forming a second path of light branching off from said first path of light when placed in said first position; first means provided in said first path of light and behind said movable reflecting member for observing and/or photographing said image formed by said image forming optical system; second means provided in said second path of light for observing and/or photographing said image of the fundus of the eye; actuating means for actuating said first or second means to photograph; control means connected with said actuating means for controlling the movement of said movable relecting member between said first and second positions, said control means including: first control means for normally keeping said reflecting member in said second position, inserting said reflecting member into said first position as said actuating means actuates said second means, and after a definite time interval moving said reflecting member into said second position; and second control means for normally keeping said reflecting member in said first position, moving said reflecting member into said second position as said actuating means actuates said first means, and after a definite time interval moving said reflecting member into said first position; and changeover switch means for selectively actuating said first or second control means.
Claim 2
Dependent Claim
289 words
An eye fundus camera comprising: an illuminating optical system for illuminating the fundus of the eye to be inspected; an image forming optical system having a first path of light in which the rays of light from the fundus of the eye can travel for forming an image of the fundus of the eye; a movable reflecting member movable betwen a first position within said first path of light and a second position outside of said first path of light, said reflecting member forming a second path of light branching off from said first path of light when placed in said first position; first means provided in said first path of light and behind said movable reflecting member for observing and/or photographing said image formed by said image forming optical system; second means provided in said second path of light for observing and/or photographing said image of the fundus of the eye; actuating means for actuating said first or second means to photograph; control means connected with said actuating means for controlling the movement of said movable relecting member between said first and second positions, said control means including: first control means for normally keeping said reflecting member in said second position, inserting said reflecting member into said first position as said actuating means actuates said second means, and after a definite time interval moving said reflecting member into said second position; and second control means for normally keeping said reflecting member in said first position, moving said reflecting member into said second position as said actuating means actuates said first means, and after a definite time interval moving said reflecting member into said first position; and changeover switch means for selectively actuating said first or second control means.
Claim 3
Dependent Claim
37 words
An eye fundus camera as claimed in claim 1, in which said control means further includes a third control means for keeping said reflecting member in said second position irrespective of the action of said actuating means.
Claim 4
Dependent Claim
78 words
An eye fundus camera as claimed in claim 1, in which said first means comprises: a film plane where the image of the eye fundus is to be formed; a first movable mirror provided in front of said film plane and normally kept in a third position within said first path of light and withdrawn from said position as said actuating means operates; and a viewfinder part provided in the path of light reflected from said movable mirror.
Claim 5
Dependent Claim
80 words
An eye fundus camera as claimed in claim 3, in which said second means comprises: a film plane where the image of the eye fundus is to be formed; a second movable mirror provided in front of said film plane and normally kept in a fourth position within said second path of light and withdrawn from said fourth position as said actuating means operates; and a second viewfinder part provided in the path of light reflected from said movable mirror.
Claim 6
Dependent Claim
49 words
An eye fundus camera as claimed in claim 3, in which said second means comprises a camera tube means for converting the image of the eye fundus into an electrical signal, and a display tube responsive to said electrical signal for providing a visual display of the eye fundus.
References Cited (Backward Citations)
US4322137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |