Magnetic Actuator

Abstract

TASK To improve the attenuation effect of a magnetic actuator against external disturbances. SOLUTION So that an attenuation effect owing to an electromotive force may be obtained in the magnetic actuator when a moveable part (coil support member and lens holder) supported by sheet springs is displaced, an electric resonance circuit is formed by connecting an accessory coil 26 in parallel to a drive coil 11 mounted on the moveable part, and the resonance frequency of the circuit electric resonance circuit is made to agree with that of a spring mass system of the magnetic actuator. As the drive frequency is typically in a range that substantially differs from the resonance frequency, a large damping force, effective against the resonant condition owing to external disturbances, can be obtained without substantially affecting the drive property. Therefore, a favorable scanning drive property can be achieved by minimizing the influences of external vibrations on the light emitting and receiving control of a onboard laser radar device.

Dependencies are inferred from the claim text.