Optical pickup devices.

摘要

An optical pickup device in which a light beam from a laser light source (3) is converged by an object lens (1) on to a signal recording surface of an optical disc (101) to follow recording tracks formed on the signal recording surface to read out or write data on to or from the signal recording surface. A semiconductor laser unit (3) is used as the laser light source and is arranged so that the meridional plane of the light beam emanating from the semiconductor laser unit (3) is inclined between 30 and 60 with respect to the tangential direction of the recording track. This arrangement overcomes problems of incorrect focusing or tracking servo operation arising from the astigmatic difference effect characteristic of the semiconductor laser unit (3).