Optical pickup device

Details Optical pickup device Optical pickup device

G - Physics

11

B

352/32.1

G11B 7/08 (2006.01) G11B 7/09 (2006.01) G11B 7/13 (2006.01) G11B 7/135 (2006.01)

Patent

CA 1317674

ABSTRACT OF THE DISCLOSURE An optical pickup device is disclosed which includes a light source, an optical lens system that converges light beams from the light source onto a recording medium, a photodetector with three divided regions that detects light beams reflected from the recording medium, and a hologram optical element that introduces the reflected light beams from the recording medium into the photodetector. The hologram optical element is divided into two regions, a part of the reflected light beams from the recording medium is diffracted by the first region of the hologram optical element and focused on a division line in the direction of the diffraction of the hologram optical element. The division line divides the photodetector into two regions, a first region and a second region. The other part of the reflected light beams is diffracted by the second region of the hologram optical element and focused on a third region of the photodetector. A difference in the output intensity between the first and second regions of the photodetector results in a focus error signal and the total of the output intensity of the first, second and third regions of the photodetector results in an information signal.

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