Endoscope optical system

Details Endoscope optical system Endoscope optical system

1993-04-21

1994-07-05

Ben, Loha

Optical: systems and elements

Compound lens system

With relay

359717, 359793, G02B 2300

Patent

active

053272838

ABSTRACT:
The endoscope optical system has an objective with an object-side negative lens cluster, the constructional design of which should minimise or exclude image scale defects, such as distortion and field curvature. The object-side negative lens cluster comprises two menisci each having negative refractive power. The individual defects of distortion occurring at the surfaces are reduced as a result of the meniscus-like design, and a flattened image field, that is prevention of field curvature, is achieved as a result of splitting the lens cluster into two menisci. The object-side meniscus may be designed as a single lens or as a cemented component comprising an outer lens and an inner lens. Since the distortion defect at the cement surface has a negative sign, the defects are thus partially compensated at the outer surfaces of the meniscus.

REFERENCES:
patent: 4300812 (1981-11-01), Nakahashi
patent: 4501477 (1985-02-01), Sunaga
patent: 4662725 (1987-05-01), Nisioka
patent: 4806001 (1989-02-01), Okabe et al.
patent: 4946267 (1990-07-01), Hoogland
Abstract No. 63-113415(A) dated Sep. 28, 1998, vol. 12, No. 361.
Derwent Abstract No. 85-158083/26 dated Aug. 8, 1985.

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