Objective for an endoscope

Details Objective for an endoscope Objective for an endoscope

1987-01-28

1989-02-21

Corbin, John K.

350469, G02B 2300, G02B 960, G02B 962

Patent

active

048060011

ABSTRACT:
An objective for an endoscope comprising, in the order from the object side, a first lens unit I having negative refractive power, a second lens unit II having positive refractive power, a third lens unit III having positive refractive power, an aperture stop S arranged between the front end of the second lens unit and rear end of the third lens unit and a fourth lens group IV comprising a lens component which has a concave surface on the object side, the four unit objective for an endoscope being arranged so that the overall length is short, outer diameter of the objective is small, angle of view is wide, intensity of light in the marginal portion is high, and distortion is corrected favourably.

REFERENCES:
patent: 2781695 (1957-02-01), Klemt
patent: 3209646 (1965-10-01), Appeldorn et al.
patent: 4037938 (1977-07-01), Yamashita et al.
patent: 4176915 (1979-12-01), Mori
patent: 4674844 (1987-06-01), Nishioka et al.

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