Lens barrel driving apparatus in camera

Details Lens barrel driving apparatus in camera Lens barrel driving apparatus in camera

1986-04-23

1987-03-31

Perkey, William B.

3542341, G03B 310, G03B 908

Patent

active

046538925

ABSTRACT:
An apparatus for axially moving a photographic lens barrel in a camera by a corresponding number of steps to the number of driving pulses supplied to a rocking coil in a magnetic field, as motion of the coil is transmitted through a ratchet mechanism with a cam to the barrel. In synchronism with the falling edge of each driving pulse at which the ratchet mechanism starts to return to its initial position by the bias force of a spring, a negative going pulse of shorter duration than that of the driving pulse is applied to the coil to speed up the setting of the barrel.

REFERENCES:
patent: 4021821 (1977-05-01), Peterson
patent: 4396267 (1983-08-01), Hirohata et al.
patent: 4401378 (1983-08-01), Hirohata et al.
patent: 4423941 (1984-01-01), Iwata et al.
patent: 4505566 (1985-03-01), Noguchi
patent: 4505567 (1985-03-01), Hirohata et al.
patent: 4508422 (1985-04-01), Hirohata

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