Read/write head for optical disks

Details Read/write head for optical disks Read/write head for optical disks

G - Physics

11

B

88/98, 352/32.4

G11B 7/08 (2006.01) G11B 7/12 (2006.01) G11B 11/10 (2006.01) G11B 11/105 (2006.01)

Patent

CA 1258123

A B S T R A C T READ/WRITE HEAD FOR OPTICAL DISKS In an optical storage system, an information bearing surface is moved relative to a read/write head. The read/write head consists of a transparent body. Light beams are sent to and from the surface through multiple internal reflections within the read/write head. Optical elements are integrated into the surface of the body at the locations where the internal reflections occur. The optical elements shape and focus the beam. A distortion free imaging system is obtained with two series-arranged aspheric reflection surfaces which focus the beam on the information bearing surface 1. The separation of the input and the reflected beam paths is achieved with a polarizing beam splitter and an associated quarter-wave layer. For readout of a magneto-optic information bearing surface an imperfect polarizing beam splitter is used in connection with a differential detection scheme to increase the signal to noise/ratio.

522085

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