Patent US4235529A successfully refreshed from Google Patents.
US4235529A
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Apparatus for recording images of crystalline lens sections
Assignee: Topcon Corp
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Filing: 1978-02-21
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Granted: 1980-11-25
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Expires: 1998-02-21
Abstract
Abstract Apparatus for taking photographs of crystalline lens sections including a slit illumination system and a photographing optical system which includes an optical axis inclined with respect to the slit illumination plane. In order to eliminate an image of illumination light source which may be produced by a light reflected at the patient's cornea, a light interrupting blade member is provided in the illumination optical path at a side of the slit axis adjacent to the photographing optical system.
Inventors
- 👤 Suminosuke Kawase
- 👤 Yukinori Karasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:11
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/14; A61B3/13; A61B3/135
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
Apparatus for recording images of sections of crystalline lenses which comprises a slit illumination system for illuminating a crystalline lens along a slit illumination path including a slit plane having a slit axis, a recording optical system having an optical axis inclined with respect to the slit plane, light interrupting means in the illumination path between the objective lens means of the slit illumination system and the crystalline lens at a side of the slit axis adjacent to the recording optical system so as to selectively block a portion of light projected by the slit illumination system.
Claim 2
Dependent Claim
97 words
Apparatus for recording images of sections of crystalline lenses which comprises a slit illumination system for illuminating a crystalline lens along a slit illumination path including a slit plane having a slit axis, a recording optical system having an optical axis inclined with respect to the slit plane, light interrupting means in the illumination path between the objective lens means of the slit illumination system and the crystalline lens at a side of the slit axis adjacent to the recording optical system so as to selectively block a portion of light projected by the slit illumination system.
Claim 3
Dependent Claim
38 words
Apparatus in accordance with claim 1 in which said light interrupting means is movable between an operative position wherein it is projected into the illumination path and an inoperative position wherein it is retracted from the illumination path.
Claim 4
Dependent Claim
26 words
Apparatus in accordance with claim 2 in which means is provided for actuating the interrupting means into the operative position when a record is being taken.
Claim 5
Dependent Claim
16 words
Apparatus in accordance with claim 1 in which said recording optical system is a photographing system.
Claim 6
Dependent Claim
26 words
Apparatus in accordance with claim 1 in which said interrupting means comprises a blade member having an edge adapted to be positioned in the illumination path.
Claim 7
Dependent Claim
19 words
Apparatus in accordance with claim 1 in which means is provided for adjusting position of the light illuminating means.
Claim 8
Dependent Claim
14 words
Apparatus in accordance with claim 6 in which said adjusting means is cam means.
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) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |