Apparatus for detecting a position of an optical pickup

Details Apparatus for detecting a position of an optical pickup Apparatus for detecting a position of an optical pickup

G - Physics

11

B

352/32.21

G11B 7/00 (2006.01)

Patent

CA 1177166

ABSTRACT OF THE DISCLOSURE An apparatus for detecting a position of an optical pickup is disclosed in which there are provided a lens having lens areas of four quadrants sectioned by two planes, each including an optical axis and being perpendicular to each other, focal lengths of the lens areas of first and third quadrants being selected equal with each other, focal lengths of the lens areas of second and fourth quadrants being selected equal to each other, the focal length of the lens areas in the first and third quadrants being selected dif- ferent from that of the lens areas in the second and fourth quadrants, the respective lens areas having axial symmetry, the lens being located within the optical path of the reflected beam on an optical disc, and a photo detector having four divided detecting portions in correspondence with the respective lens areas for detecting the reflected beam passed through the lens.

415101

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