Optical system for endoscopes and endoscopes using same

Details Optical system for endoscopes and endoscopes using same Optical system for endoscopes and endoscopes using same

1992-04-20

1993-01-05

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358225, 359708, 359359, 359356, H04N 718

Patent

active

051776057

ABSTRACT:
In order to enable to sufficiently deflect the viewing direction for a distal end having an end surface substantially perpendicular to the optical axis of an objective optical system and minimize aberrations produced due to the deflecting action, the objective optical system for endoscopes comprises at least one surface designed as a deflecting surface or an eccentric surface on the image side of the surface nearest the object to be observed out of the surfaces of the optical components composing the objective optical system so that the light is refracted at least twice for deflecting the viewing direction. In order to shorten total length and minimize outside diameter of the objective optical system and enable to sufficiently eliminate the infrared light incident from the object, the objective optical system comprises at least one optical component made of a substance absorbing the light having the oscillation frequency of the YAG laser light and interference films reflecting the light having the oscillation frequency of the YAG laser light formed on the cemented surfaces of the optical components and/or the surface of emergence of a rear group designed as a positive lens component.

REFERENCES:
patent: 4354734 (1982-10-01), Nakahashi
patent: 4499897 (1985-02-01), Roussel
patent: 4523806 (1985-06-01), Kojima
patent: 4618884 (1986-10-01), Nagasaki
patent: 4643524 (1987-02-01), Mori
patent: 4717952 (1988-01-01), Kohayakawa
patent: 4735491 (1988-04-01), Takahashi
patent: 4805027 (1989-02-01), Sluyter
patent: 4806001 (1989-02-01), Okabe et al.
patent: 4807026 (1989-02-01), Nishioka
patent: 4860732 (1989-08-01), Hasegawa
patent: 4882619 (1989-11-01), Hasegawa

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