Objective lens for endoscope

Details Objective lens for endoscope Objective lens for endoscope

1994-11-10

1996-11-26

Nelms, David C.

Optical: systems and elements

Lens

Multiple component lenses

359660, G02B 912

Patent

active

055791743

ABSTRACT:
An objective lens for an endoscope includes a first lens group of a positive power having a plurality of lenses, and a second lens group of a negative power. The first lens group is provided with a negative first lens located adjacent to an object to be photographed. The objective lens meets the requirements defined by (1) 0.6<f.sub.F /f<1.0, (2)-6.0<f.sub.s /f<-1.0, and (3) 1.0<L.sub.D /f<4.0, where f.sub.F designates a focal length of the first lens group, f.sub.s designates a focal length of the second lens group, f designates a focal length of the whole lens system, and L.sub.D designates a sum of the whole lens length and back focal distance.

REFERENCES:
patent: 4037938 (1977-07-01), Yamashita et al.
patent: 4042295 (1977-08-01), Yamashita et al.
patent: 4059344 (1977-11-01), Yamashita
patent: 4403837 (1983-09-01), Nakahashi
patent: 4493537 (1985-01-01), Nakahashi
patent: 4674844 (1987-06-01), Nishioka et al.
patent: 4764001 (1988-08-01), Yokota
patent: 4806001 (1989-02-01), Okabe et al.
patent: 4867546 (1989-09-01), Nishioka et al.
patent: 4979808 (1990-12-01), Yamagata et al.
patent: 5050974 (1991-09-01), Yakasugi et al.
patent: 5087989 (1992-02-01), Igarashi
patent: 5175650 (1992-12-01), Takayama et al.
patent: 5198931 (1993-03-01), Igarashi
patent: 5208702 (1993-05-01), Shiraiwa
patent: 5223982 (1993-06-01), Suzuki et al.
patent: 5296971 (1994-03-01), Mori

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