Lens adapter for endoscopes

Details Lens adapter for endoscopes Lens adapter for endoscopes

1983-04-21

1985-02-26

Willis, Davis L.

350 9626, 350572, 350410, 350422, G02B 704

Patent

active

045014779

ABSTRACT:
A variable focal length lens adapter is attached to an endoscope at its eyepiece. The lens adapter includes a lens system constituting a variable focal length lens system in combination with the eyepiece. The lens system of the lens adapter is composed of a negative lens group located next to the eyepiece, a positive lens group located next to the negative lens group and a second negative lens group located next to the positive lens group on the side opposite to the first negative lens group. The first negative lens group and the positive lens group are axially movable to vary the focal length of the total lens system of the adapter. The last negative lens is used as a diopter adjusting lens.

REFERENCES:
patent: 1553211 (1925-09-01), Barr et al.
patent: 2165341 (1939-07-01), Capstaff et al.
patent: 3638996 (1972-02-01), Klein
patent: 4285578 (1981-08-01), Yamashita et al.

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