Patent ID: 6594205
Filing Date: 2003-07-15
Classification: G11B

Abstract:
An optical scanning device, comprising:a radiation source; an optical lens system with an optical axis for focusing a radiation beam supplied, in operation, by the radiation source into a scanning spot on an information carrier, the lens system including: a housing; a first lens which is secured in the housing in a fixed position; and a second lens which, viewed in a direction parallel to the optical axis, is elastically suspended in the housing; a first actuator for displacing the lens system in a direction parallel to the optical axis; a first control unit for controlling the first actuator by means of a first control signal; a second actuator for displacing the second lens relative to the first lens in a direction parallel to the optical axis; and a second control unit for controlling the second actuator by means of a second control signal, and in which during operation, the first control unit also controls the second actuator by means of a third control signal which is proportional to the first control signal.