Patent US3918072A successfully refreshed from Google Patents.
US3918072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-lens reflex optical system for an endoscope
Assignee: Olympus Corp
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Filing: 1973-12-11
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Granted: 1975-11-04
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Expires: 1993-12-11
Abstract
Abstract A single-lens reflex optical system for an endoscope having a reflecting mirror with a small hole arranged in the photographing optical system so that said small hole comes to a position substantially at the stop of said photographing optical system. The system is designed for observing the light from the object which is reflected by said mirror through an observing optical system at the same time as photographing by said photographing optical system.
Inventors
- 👤 Toshihiro Imai
- 👤 Takeshi Okada
- 👤 Nobuo Yamasita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:24
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G02; G02B; G02B17/00; G02B17/02; G02B17/04; G02B17/045; G02B23/00; G02B23/24; G02B23/2407; G02B23/2423
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A single-lens reflex optical system for an endoscope of the type which is inserted into body cavities, said optical system arranged at the distal end of the endoscope and comprising a photographing optical system, a reflecting mirror arranged in inclined position with respect to the optical axis of said photographing optical system and having means defining a small hole arranged substantially at the stop of said photographing optical sytem and functioning as an aperture stop therefor, a film, said photographing optical system focusing photographing light penetrating the hole on the film, said reflecting mirror functioning to reflect observing light, an observing optical system and an image guide arranged along the optical axis of the observing light, wherein the observing light is focused on an end surface of said image guide.
Claim 2
Dependent Claim
130 words
A single-lens reflex optical system for an endoscope of the type which is inserted into body cavities, said optical system arranged at the distal end of the endoscope and comprising a photographing optical system, a reflecting mirror arranged in inclined position with respect to the optical axis of said photographing optical system and having means defining a small hole arranged substantially at the stop of said photographing optical sytem and functioning as an aperture stop therefor, a film, said photographing optical system focusing photographing light penetrating the hole on the film, said reflecting mirror functioning to reflect observing light, an observing optical system and an image guide arranged along the optical axis of the observing light, wherein the observing light is focused on an end surface of said image guide.
Claim 3
Dependent Claim
53 words
A single-lens reflex optical system for an endoscope according to claim 1, further comprising a window serving as a cover-glass, said window arranged on the optical axis of said photographing optical system and functioning to pass through light from the object, the surface of said window that faces said reflecting mirror being concave.
Claim 4
Dependent Claim
87 words
A single-lens reflex optical system for an endoscope according to claim 1, further comprising two cemented isosceles right angular prisms having said reflecting mirror on the cemented surface of said prisms, a portion of the light from the object incident on said prisms passing through the hole of said reflecting mirror and being focused on the film, with the rest of the light from the object being reflected by said reflecting mirror and being focused on the end of said image guide by said observing optical system.
Claim 5
Dependent Claim
106 words
A single-lens reflex optical system for an endoscope according to claim 1, further comprising a penta-prism having said reflecting mirror on one surface that faces said film and further having a reflecting surface where the light reflected by said reflecting mirror arrives, a portion of the incident light from the object on said penta-prism passing through the hole of said reflecting mirror and being focused on the film, with the rest of the light from the object being reflected by said reflecting mirror and being further reflected by said reflecting surface and being focused on the end of said image guide by said observing optical system.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |