Varifocal type finder

Details Varifocal type finder Varifocal type finder

1984-09-24

1987-12-29

Corbin, John K.

354219, 354222, G02B 1502, G03B 1310

Patent

active

047156929

ABSTRACT:
In the disclosed finder, an auxiliary lens for changing the magnification power is inserted into the space between an objective lens and an eyepiece. The size of the viewfield frame is simultaneously changed to maintain a constant percentage of the viewfield of the finder. The required rate of change of magnification power that the auxiliary lens must attain to leave the size of the viewfield frame of the finder unchanged can be reduced with the advantage of minimizing the bulk and size of the finder.

REFERENCES:
patent: 4256396 (1981-03-01), Kawaguchi et al.
patent: 4478493 (1984-10-01), Yokota
patent: 4591234 (1986-05-01), Hamanishi
patent: 4595270 (1986-06-01), Yamada et al.

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