| 摘要 |
An optical pickup device in which a light beam radiated from a semiconductor laser element is converted by a collimator lens into collimated light beam which is converged by an objective lens so as to be illuminated on an optical disc. A beam shaping element having a hologram pattern on its incident surface and/or its radiating surface is provided on a divergent optical path of the radiated light beam from the semiconductor laser element between the semiconductor laser element and the collimator lens for shaping the light beam radiated from the semiconductor laser element for forming a beam spot of an optimum shape on the optical disc.
|
