Lens actuator

Details Lens actuator Lens actuator

1990-10-02

1992-07-21

Ben, Loha

Optical: systems and elements

Lens

With support

359823, 369 4422, G02B 702

Patent

active

051328500

ABSTRACT:
A lens actuator has a support shaft, a substantially cylindrical holder member slidably supported by the support shaft and an optical system. The holder member has at least four openings extending in the direction of the center axis of the support shaft. The optical system is held by the holder member so that the optical axis thereof is parallel with the center axis of the support shaft. A coil is mounted on the side of the holder member. An external yoke is provided around the holder member. An internal yoke is divided into the same number of portions to be inserted in the openings as the openings in the holder member. A magnetic field across the coil is generated by a magnet cooperating with the external yoke and the internal yoke. The rigidity of the holder member is enhanced so that the occurrence of resonance can be suppressed at the frequency used in the actuator.

REFERENCES:
patent: 4571026 (1986-02-01), Maruta

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