Focusing error detector and optical data detecting device...

Details Focusing error detector and optical data detecting device... Focusing error detector and optical data detecting device...

G - Physics

11

B

352/32.21

G11B 7/13 (2006.01) G11B 7/09 (2006.01) G11B 7/125 (2006.01)

Patent

CA 1319194

ABSTRACT OF THE DISCLOSURE A focusing error detector comprises a light source, a collimator lens for making the pencil of rays emitted by the light source parallel, an objective lens which focuses the parallel pencil of rays to form a beam spot on a data- recording disc with data tracks and guide tracks formed thereon and which receives the pencil of rays reflected from the data-recording disc, an optical system for forming a beam spot from the reflected pencil of rays incident to the objective lens, and an optical detector having a plurality of divided optical sensor blocks for receiving the formed beam spot so as to detect the focusing error of the beam spot formed on the data-recording disc on the basis of the configuration of the received beam spot.

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