Focusing lens position controlling apparatus for a variable foca

Details Focusing lens position controlling apparatus for a variable foca Focusing lens position controlling apparatus for a variable foca

1994-06-28

1996-10-29

Perkey, W. B.

Photography

Having variable focal length of camera objective

Having focus operation

396 79, G03B 1336

Patent

active

055701558

ABSTRACT:
A focusing lens position controlling apparatus for a variable focal length lens includes a variable focal length lens having a focusing lens group, a distance measuring device for measuring the object distance information to an object, a focal length detecting device for detecting the focal length information of the variable focal length lens, a first calculating device for calculating an operation coefficient from the output value from the focal length detecting device regarding the focal length information, and a second calculating device for calculating the amount of movement of the focusing lens group from the output value from the distance measuring device regarding the object distance information and the operation coefficient.

REFERENCES:
patent: 4043642 (1977-08-01), Hirose et al.
patent: 4914464 (1990-04-01), Azuma et al.
patent: 5181061 (1993-01-01), Kawasaki et al.
patent: 5448413 (1995-09-01), Kobayashi et al.

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