Optical: systems and elements – Lens – With support
Patent
1990-04-25
1992-05-05
Ben, Loha
Optical: systems and elements
Lens
With support
359823, 369 4411, 369 4422, G02B 702
Patent
active
051113392
ABSTRACT:
A lens actuator capable of driving a lens smoothly in two-directions and which is small in size and light in weight is disclosed. The lens actuator include a base having a supporting shaft, a lens holder set so as to be rotatable about and slidable along the supporting shaft, a lens retained by the holder so that an optical axis thereof is parallel with the supporting shaft and the lens is mounted on the holder at a position separate from the supporting shaft, a first coil mounted on the holder for generating a force for rotating the holder by flowing a current therein, a second coil mounted on the holder for generating a force for slidably moving the holder along the supporting shaft by flowing a current therein and a magnet mounted on the base for applying a magnet field to the first and second coils. The first coil is mounted on the holder on the side opposed to the lens with the supporting shaft between. The first coil balances the weight of the lens so that the center of gravity of the holder is substantially at the center of rotation thereof.
REFERENCES:
patent: 4473274 (1984-09-01), Yano et al.
patent: 4571026 (1986-02-01), Maruta
patent: 4679903 (1987-07-01), Kasahara et al.
patent: 4752117 (1988-06-01), Ichikawa et al.
Ben Loha
Canon Kabushiki Kaisha
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