Optical system for endoscopes

Details Optical system for endoscopes Optical system for endoscopes

1991-10-07

1993-08-03

Arnold, Bruce Y.

Optical: systems and elements

Lens

Including a nonspherical surface

359716, 359754, G02B 302, G02B 900

Patent

active

052334732

ABSTRACT:
An optical system for an endoscope has, in order from its object side, an objective lens system having a first lens unit with a negative refractive power, a second lens unit with a positive refractive power and an aspherical surface therein, and relay lens systems arranged on the image side of the objective lens system. The optical system for an endoscope can correct aberrations, assure uniform brightness over the entire range of an image from its center to its peripheral areas, and permits reducing the diameter of the cover glass plate used therein.

REFERENCES:
patent: 4575195 (1986-03-01), Hoogland
patent: 4867546 (1989-09-01), Nishioka et al.
patent: 4957355 (1990-09-01), Sato
patent: 5050974 (1991-09-01), Takasugi et al.
patent: 5087989 (1992-02-01), Igarashi

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