Photography – With exposure objective focusing means – focusing aid – or... – Dual purpose motor
Patent
1995-09-13
1998-01-20
Lee, Eddie C.
Photography
With exposure objective focusing means, focusing aid, or...
Dual purpose motor
396463, G03B 908, G03B 300
Patent
active
057109494
ABSTRACT:
A lens driving device for controlling the position of a lens setting member according to a distance to an object to be photographed has a lens barrel mounted to undergo movement in the direction of an optical axis, a lens setting member mounted to undergo rotation about the lens barrel and to move the lens barrel in the direction of the optical axis, a biasing spring for applying a biasing force for biasing the lens setting member in one direction, a ratchet engaging with the lens setting member to undergo rotation therewith, a retaining member having a pair of engaging pawls disposed to alternately engage with the ratchet to prevent rotation of the ratchet due to the biasing force of the biasing spring, an electromagnetic actuator for applying a first driving voltage for maintaining the retaining member in an engaged state and a second driving voltage for rocking the retaining member to alternately engage the pawls with the ratchet to cause the biasing spring to rotate the ratchet in a stepwise manner during periods when the ratchet is not engaged by either of the engaging pawls of the retaining member, and a driving ring for driving the lens barrel to return to an initial position by rotating the lens setting member to an initial position against the biasing force of the biasing spring and for performing at least one of an exposure operation and an aperture control operation. In the lens driving device, the first driving voltage of the electromagnetic actuator is lower than the second driving voltage such that a lower voltage is applied when the driving member is rotated and the lens setting member is at rest than when the lens setting member is not at rest.
REFERENCES:
patent: 4217049 (1980-08-01), Kitai et al.
patent: 4881096 (1989-11-01), Ogihara et al.
patent: 4974006 (1990-11-01), Shinozaki et al.
patent: 5111230 (1992-05-01), Kobayashi
Akimoto Kazuo
Kusumi Hiroki
Tanikawa Miyoshi
Lee Eddie C.
Seiko Precision Inc.
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