G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/135 (2006.01) G02B 5/32 (2006.01) G11B 7/085 (2006.01) G11B 11/105 (2006.01)
Patent
CA 2084324
An optical pickup apparatus including a light emitting source, a hologram element for scanning a recording medium with light beams emitted from the light emitting source, a hologram lens for focusing the light beams introduced from the hologram element on the recording medium, an optical detector for detecting the light beams reflected from the recording medium, and a first optical system for directing the light beams reflected from the recording medium to the optical detector. The hologram element includes an optical diffraction grating for diffracting the light beams emitted from the light emitting source and a control means for controlling the rotation of the hologram element in a swinging manner. The hologram element can have hologram gratings on both surfaces thereof; one of them has a pattern of straight lines and the other has a pattern of concentric circles to obtain a widened deflection angle.
Kubo Katsuhiro
Kurata Yukio
Miyake Takahiro
Ueyama Tetsuo
Yoshida Yoshio
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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