Optical system for endoscopes

Details Optical system for endoscopes Optical system for endoscopes

1984-12-27

1988-04-05

Corbin, John K.

350 9631, 350445, 350447, 350450, G02B 2326, G02B 2302

Patent

active

047354917

ABSTRACT:
An optical system for endoscopes provided with a retrofocus type or two convex lenses type objective, a relay lens consisting of a graded refractive index lens for relaying an image of the objective and an eyepiece system for observing the image relayed by the relay lens, in order to make it possible to obtain a clear and high quality image of a wide visual field. The objective includes an aperture stop and a field stop provided between the objective and relay lens. The objective comprises a front lens group and rear lens group. The front lens group can be formed as of a straight viewing type, side viewing type or oblique viewing type. The rear lens group is movable along the optical axis through the relay lens.

REFERENCES:
patent: 3936149 (1976-02-01), Imai
patent: 4042295 (1977-08-01), Yamasita et al.
patent: 4101196 (1978-07-01), Imai
patent: 4138192 (1979-02-01), Yamasita

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