Laser module, optical pickup device, optical disk device, focus error detection method and tracking error detection method

Abstract

It is an object to provide a laser module in which the position and the posture of a laser beam source can be adjusted even in a small space so that an optical intensity necessary for recording and reproducing information can be ensured and the laser module is seldom affected by an ambient temperature. It is another object of the present invention to provide an optical pickup device, an optical disk device, a focus error detection method and a tracking error detection method. The laser beam source adjustment memberand the laser beam source shift memberare attached to the laser beam sourceso that the leadcan penetrate them. Further, FPCis fixed to the leadbeing soldered. The laser beam sourceand the laser beam source adjustment memberare fixed between the holding plateand the laser beam source shift memberbeing pushed by the pushing springThe laser beam source adjustment memberhas a spherical face formed round a light emitting point of the laser beam sourceand is rotated round the light emitting point of the laser beam sourceso that an inclination of the laser beam sourcewith respect to the axial direction can be adjusted.