Patent DE486287C successfully refreshed from Google Patents.
Patent US3770342A successfully refreshed from Google Patents.
US3770342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for lighting and examining a cavity
Assignee: Individual
•
Filing: 1972-05-01
•
Granted: 1973-11-06
•
Expires: 1992-05-01
Abstract
Abstract A device for examining the inside of a cavity and, more particularly, for viewing or photographing the retina comprising a plurality of optical fibres cooperating with a light source, and an optical system forming an image of the cavity lit by the optical fibres. In this device, the optical fibres are mounted along the generating lines of a frusto-conical support, with their transmitting ends distributed over the smaller base of the support, whereas the lens of the optical system are mounted within the support, at right angles to the axis thereof.
Inventors
- 👤 R Dudragne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:18
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/60; A; A61; A61B; A61B3/00; A61B3/0008; A61B3/10; A61B3/12; A61B3/125; G02B23/00; G02B23/24; G02B23/2407; G02B23/2423; G02B23/243; G02B23/2461; G02B23/2469; G02B6/00; G02B6/02; G02B6/04; G02B6/06; G02B6/24; G02B6/26; G02B6/262; G02B9/12; G02B9/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
Device for examining an eye fundus, comprising a plurality of optical fibres the transmitting ends of which are positioned in such a way as to distribute their light beams in order to pass through the pupil and illuminate the eye fundus and an optical system suitable to form an image of the eye fundus thus lit, said device comprising means for supporting the optical fibres arranged with the general shape of a conical crown having a semiangle at the apex comprised between 20* and 30* and along which the terminations of the optical fibres are positioned, the transmitting ends of said fibres being distributed over the smaller base of the crown, said supporting means having, fixed perpendicularly to its axis, at least one lens situated in the immediate vicinity of said smaller base, the inside diameter of said smaller base and the diameter of the said lens being comprised between 7 and 8 mm, said smaller base being adapted to be placed in contact with the cornea.
Claim 2
Dependent Claim
167 words
Device for examining an eye fundus, comprising a plurality of optical fibres the transmitting ends of which are positioned in such a way as to distribute their light beams in order to pass through the pupil and illuminate the eye fundus and an optical system suitable to form an image of the eye fundus thus lit, said device comprising means for supporting the optical fibres arranged with the general shape of a conical crown having a semiangle at the apex comprised between 20* and 30* and along which the terminations of the optical fibres are positioned, the transmitting ends of said fibres being distributed over the smaller base of the crown, said supporting means having, fixed perpendicularly to its axis, at least one lens situated in the immediate vicinity of said smaller base, the inside diameter of said smaller base and the diameter of the said lens being comprised between 7 and 8 mm, said smaller base being adapted to be placed in contact with the cornea.
Claim 3
Dependent Claim
42 words
Device in accordance with claim 1, wHerein the said lens is divergent and spherical, the radius of curvature of the surface thereof which is nearest to the said smaller base being substantially equal to that of the cornea of the human eye.
Claim 4
Dependent Claim
30 words
Device in accordance with claim 1, characterized in that said optical system has a focal distance close to that of the human eye and is corrected for an anterior diaphragm.
Claim 5
Dependent Claim
55 words
Device in accordance with claim 1, wherein a convergent optical system is fixed to each of said fibre transmitting ends, said convergent optical system being adapted for making the light beam transmitted by the optical fibre substantially convergent along a circle having substantially the same diameter as that of the pupil of the human eye.
Claim 6
Dependent Claim
13 words
Device in accordance with claim 1, wherein the said semi-angle is about 25*.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |