Patent ID: 6473389
Filing Date: 2002-10-29
Classification: B82Y,G11B

Abstract:
A lens actuator of an optical head for an optical disc drive comprising: an actuator supported by a carriage via a spring and driven to displace at least in focus directions; a second lens unit including at least one lens held by the actuator; a slider supported by the actuator and floated off a turning optical disc via an air bearing; and a first lens including at least one lens and held by the slider; whereby a laser beam is focused on the optical disc by means of an object lens system which includes the first lens and the second lens;wherein the slider is supported by the actuator via a support having a predetermined spring constant in the focus directions while also having freedom to follow tilting of the optical disc; and wherein the support for supporting the slider on the actuator has a resonance frequency higher than a resonance frequency of the spring for supporting the actuator on the carriage and lower than a resonance frequency of the air bearing formed between the slider and the optical disc.