Optical disk apparatus and optical head

Details Optical disk apparatus and optical head Optical disk apparatus and optical head

G - Physics

11

B

G11B 7/095 (2006.01) G11B 7/0033 (2006.01) G11B 7/0037 (2006.01) G11B 17/04 (2006.01) G11B 23/03 (2006.01)

Patent

CA 2054316

ABSTRACT OF THE DISCLOSURE An overwritable optical disk apparatus in which a finite conjugate optical system is employed. The apparatus comprises an optical head for converging diffused light from a light source onto an optical disk for performing data write/read operation, a driving unit for rotating the disk and a beam splitter for guiding the light reflected from the optical disk to a photodetector for detecting light reflected from the optical disk. Influence of disk displacement occurring in accompanying the rotation of the disk and disk eccentricity are suppressed to a minimum by encasing rotatably the optical disk within a credit card size casing which is adapted to be loaded and held stationarily in the optical disk apparatus. Thin structure of the optical head and miniaturization of the optical disk apparatus are realized with light utilization efficiency for data write/read operation being increased.

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