Driving device having multiple driving means selectively operate

Details Driving device having multiple driving means selectively operate Driving device having multiple driving means selectively operate

1997-02-10

1998-06-23

Gray, David M.

Photography

Having variable focal length of camera objective

Having focus operation

396 85, 396 86, 348345, G03B 310

Patent

active

057714100

ABSTRACT:
A driving device utilizes first and second driving units which drive an object when the operating speed of a manual operation member detected by a pulse signal are less than and not less than, respectively, a predetermined speed. The first driving unit drives the object based on the pulse signal and the second driving unit drives the object to a predetermined position. The second driving unit, when shifted to driving from the first driving unit, retains driving even if the operating speed falls below the predetermined speed.

REFERENCES:
patent: 4568165 (1986-02-01), Ishibashi
patent: 4851869 (1989-07-01), Ishimaru et al.
patent: 4864344 (1989-09-01), Arakawa et al.
patent: 4896179 (1990-01-01), Watanabe et al.
patent: 4972215 (1990-11-01), Kitamura et al.

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