Objective lens for endoscope

Details Objective lens for endoscope Objective lens for endoscope

1998-03-09

1999-08-10

Epps, Georgia

Optical: systems and elements

Lens

Microscope objective

359659, 359661, 359781, G02B 1318

Patent

active

059367784

ABSTRACT:
In a retro-focus type objective lens for an endoscope, its front-group concave lens system is constituted by two concave lenses, and a predetermined conditional expression is satisfied, so as to secure a sufficient length of back focus, while fully favorably correcting chromatic aberration in magnification. A four group lens configuration having five lenses comprising a front-group concave lens system composed of two concave lenses L.sub.1 and L.sub.2, a rear convex lens system composed of lenses L.sub.3 and L.sub.5, with an aperture stop interposed therebetween, in order to secure a long back focus at least three times the composite focal length of the whole system, satisfied is the following conditional expression:

REFERENCES:
patent: 4059344 (1977-11-01), Yamasita
patent: 4976522 (1990-12-01), Igarshi
patent: 5087989 (1992-02-01), Igarashi
patent: 5175650 (1992-12-01), Toshikazu
patent: 5198931 (1993-03-01), Igarashi
patent: 5223982 (1993-06-01), Suziki et al.
patent: 5296971 (1994-03-01), Mori
patent: 5436767 (1995-07-01), Suziki et al.
patent: 5828498 (1998-10-01), Sekiya et al.

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