Optical pick-up apparatus capable of reading data...

Details Optical pick-up apparatus capable of reading data... Optical pick-up apparatus capable of reading data...

G - Physics

11

B

G11B 7/13 (2006.01) G11B 7/0037 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01) G11B 7/125 (2006.01) G11B 7/135 (2006.01) G11B 19/12 (2006.01) G11B 7/00 (2006.01) G11B 7/22 (2006.01)

Patent

CA 2164384

An improved optical pick-up apparatus capable of reading data irrespective of disc type capable of reading various kinds of discs having different thicknesses and writing densities using only one pick-up apparatus, which includes a light source; a beam splitter for passing through or splitting a beam from the light source; an objective lens for condensing the beam onto corresponding disc among discs having different thickness and different densities; a numerical aperture control unit for controlling an effective numerical aperture of the objective lens so as to execute a focussing operation with respect to a certain disc; and a photo-detector for receiving the beam reflected by the disc and transmitted from the beam splitter.

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