STRUCTURE FOR DAMPING OPTICAL PICKUP ACTUATOR

摘要

PURPOSE: A damping structure of optical pickup actuator is provided to improve a recording and a playing sensitivity of a disc by damping a negative resonance such as a twisting generated during driving the lens holder with a structural damping. CONSTITUTION: External driving voltage inputted through a suspension PCB(62) is transferred to a coil PCB(56) via a suspension wire(60). A signal drives a lens holder(40) by feeding to a tracking coil(46) and a focusing coil(44). A tracking error and a focusing error in a focus of a laser beam formed in a recording pit are corrected in an object lens(42). At that time, a torque is generated because operations of an optical axial and radial direction are performed at the same time. A negative resonance such as a twisting is generated in the lens holder(40). A damping shaft(50) fixed under the lens holder(40) is vibrated inside a silicon gel(21) embedded in a gel holder(20). Thereby, the negative resonance in the damping shaft(50) is reduced by the viscosity of the silicon gel(21).