Variable magnification finder

Details Variable magnification finder Variable magnification finder

1994-06-24

1996-03-12

Gellner, Michael L.

Optical: systems and elements

Prism

With reflecting surface

359676, G03B 1310, G02B 1500

Patent

active

054990726

ABSTRACT:
A variable magnification finder wherein a change in magnification is performed by rotating the finder about an axis. According to a first embodiment of this invention, a variable magnification finder has in succession from an object side a first lens component including a four-surface lens, a second lens component having a convex surface facing the object side and a third lens component having a convex surface facing the object side. The four-surface lens includes a first surface opposite a second surface and a third surface opposite a fourth surface. The first and second surfaces have a first optical axis in common and the third and fourth surfaces have a second optical axis in common. The first optical axis is substantially perpendicular to the second optical axis. Magnification of the finder is changed by rotating the four-surface lens on a third optical axis which is substantially perpendicular the first and second optical axes.

REFERENCES:
patent: 5247324 (1993-09-01), Estelle
Camara.cndot.Lens Encyclopedia published by Shashinkogyo-Shuppansha pp. 28-30.
Camera Industry vol. 48, No. 7, 1990, pp. 77-79.

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