Zoom finder

Details Zoom finder Zoom finder

1993-07-19

1997-06-24

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

056422300

ABSTRACT:
A zoom finder has first to third lens groups sequentially arranged from an object side to an eye pupil side and performs a zooming operation by fixing the first and third lens groups and moving the second lens group. The first lens group is constructed by a positive single lens. The second lens group is constructed by a negative single lens. The third lens group has a positive combinational focal length and is constructed by a negative single lens arranged on the object side and a positive single lens arranged on the eye pupil side. A frame system of the zoom finder is formed by an eye pupil side lens face of the negative single lens of the third lens group and the positive single lens of the third lens group. Radii R.sub.1 and R.sub.2 of curvature of lens faces of the first lens group on the object and eye pupil sides satisfy the following condition.

REFERENCES:
patent: 3415592 (1968-12-01), Price
patent: 3972592 (1976-08-01), Ruben
patent: 4118108 (1978-10-01), Muszumanski
patent: 4725130 (1988-02-01), Ozawa
patent: 4787719 (1988-11-01), Imai
patent: 5028125 (1991-07-01), Kikuchi
patent: 5052787 (1991-10-01), Sugawara
patent: 5202714 (1993-04-01), Iwata
patent: 5204780 (1993-04-01), Sakamoto
patent: 5353158 (1994-10-01), Matsuo
patent: 5400101 (1995-03-01), Yoneyama et al.

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