Illumination optical system for an endoscope

Details Illumination optical system for an endoscope Illumination optical system for an endoscope

1988-06-01

1989-04-25

Corbin, John K.

350 9618, 350 9626, G02B 1318, G02B 632, G02B 2326

Patent

active

048242250

ABSTRACT:
An illumination optical system for an endoscope comprising an illumination lens, which is provided on the object side of the light exiting end of a light projecting element and comprises at least one aspherical lens element, the illumination optical system for an endoscope being arranged to be applicable to a wide angle endoscope and, at the same time, being arranged to have a favorable light distribution characteristic, which ensures bright illumination up to the marginal portion of the field, and arranged that the loss in the intensity of light is small.

REFERENCES:
patent: 4266534 (1981-05-01), Ogawa
patent: 4575195 (1986-03-01), Hoogland
patent: 4662725 (1987-05-01), Nisioka
patent: 4674844 (1987-06-01), Nishioka et al.

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