Loading patent…
AssigneePanasonic Corporation
InventorsAkihiro Yasuda, Yoshiaki Komma, Yasuhiro Tanaka, Yoshiyuki Shimizu
Estimating the term…
An optical head is provided that increases the light utilization efficiency and that can be adapted to high-speed recording and double-layer disks. A beam-shaping lens that shapes an elliptical beam emitted from a light source into a substantially circular beam has a pair of cylindrical surfaces that are curved in the same direction. The cylindrical surface that is closer to the light source is an aspherical surface, and the cylindrical surface that is closer to the light source is a spherical surface. Thus, an optical head is obtained, with which aberrations can be kept low, even when the beam-shaping magnifying power is about a factor 2.
An optical head, comprising:
An optical head, comprising:
A beam-shaping lens that shapes an elliptical divergent beam that is emitted from a semiconductor laser light source into a substantially circular divergent beam, the beam-shaping lens comprising:
Dependencies are inferred from the claim text.