Control device for a view finder optical system of a view finder

Details Control device for a view finder optical system of a view finder Control device for a view finder optical system of a view finder

1996-09-05

1999-02-16

Gray, David M.

Photography

Having variable focal length of camera objective

Power zoom

396379, G03B 1700

Patent

active

058730052

ABSTRACT:
A control device for use with a view finder optical system of a view finder camera having a variable focal length photographic optical system. The control device includes a view finder having a view finder optical system with a variably set view finder focal length that is set based on the focal length of the photographic optical system, a view finder angle of view detection unit that detects a view finder angle of view in accordance with a position of the view finder optical system and that outputs a first signal, a photographic optical system angle of view detection unit that detects a photographic optical system angle of view in accordance with the position of the photographic optical system and that outputs a second signal, and a view finder drive unit that receives the first and second signals and moves the view finder optical system so that the view finder angle of view and the photographic optical system angle of view correspond. Also provided is an imaging unit that includes a variable focal length view finder optical system, a variable focal length imaging optical system and a control unit that determines a focal length of the variable focal length imaging optical system and that causes the variable focal length view finder optical system to maintain a focal length that corresponds to the focal length of the imaging optical system. Finally, a method for adjusting a view field of a view finder is provided and involves determining the focal length of a variable focal length photographic optical system and adjusting the focal length of a variable focal length view finder optical system in accordance therewith.

REFERENCES:
patent: 5103251 (1992-04-01), Kudo
patent: 5150143 (1992-09-01), Ohno et al.

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