JP2009170091A5 - - Google Patents

Claims (9)

A light source unit; and a condensing optical system including an objective lens that condenses the light beam from the light source unit on an information recording surface of an optical information recording medium, and condenses the light beam emitted from the light source. An optical pickup device configured to record and / or reproduce information by focusing on an information recording surface of the optical information recording medium via an optical system,
The light source unit integrally incorporates a light emitting unit, an optical axis changing element that changes the direction of the axis of a light beam emitted from the light emitting unit, and an actuator that moves the optical axis changing element. Optical pickup device.   A light detector for receiving a reflected light beam from the information recording surface, and the actuator is configured to detect the optical axis based on an information signal output from the light detector in response to the reflected light beam from the information recording surface. The optical pickup device according to claim 1, wherein the changing element is driven in a direction orthogonal to the optical axis. The optical pickup apparatus of claim 2, wherein said optical axis changing element is a diffraction grating. A light detector for receiving a reflected light beam from the information recording surface, and the actuator is configured to detect the optical axis based on an information signal output from the light detector in response to the reflected light beam from the information recording surface. The optical pickup device according to claim 1, wherein the changing element is rotationally driven. The optical pickup apparatus of claim 4, wherein said optical axis changing element is a mirror. By driving the optical axis changing element by the actuator, it is possible to adjust a condensing position with respect to the photodetector due to a relative optical axis shift between the light source and the condensing optical system. The optical pickup device according to claim 1. The optical pickup according to claim 1, wherein the light source has a plurality of light emitting units, and the actuator drives the optical axis changing element corresponding to one of the light emitting units. apparatus. The actuator applies a voltage to the electromechanical conversion element, a drive member fixed to one end of the electromechanical conversion element, a movable member movably held on the drive member, and the electromechanical conversion element And a drive circuit, wherein the drive member and the movable member are moved relative to each other by expanding and contracting the electromechanical conversion element in accordance with a voltage applied from the drive circuit. the optical pickup device according to any one of claims 1 to 7. Light source unit is characterized by using the optical pickup device according to claim 1-8.