Ultra-resolving optical pickup device having an optical detector

Details Ultra-resolving optical pickup device having an optical detector Ultra-resolving optical pickup device having an optical detector

1994-05-31

1996-12-17

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 7095

Patent

active

055860958

ABSTRACT:
An optical pickup device provides an ultraresolving prism between a semiconductor laser and an objective lens so as to reduce light intensity at around a cross sectional center of a laser beam, thereby generating ultraresolution thereon. An optical detector is disposed at a signal detecting position where the laser beam reflected by an optical disk is converged. The optical detector has a detecting element for receiving a main lobe and a pair of detecting elements for receiving a pair of side lobes. A peak of a shielding portion of the prism is inclined to a track center of the optical disk so that the side lobes are oppositely shifted from the track center. Thus, tracking error signals are obtained on the basis of detected signals in the side lobes.

REFERENCES:
Patent Abstracts of Japan, vol. 16, No. 390, P. 1405, Aug. 19, 1992, & JP4-125826.
Patent Abstracts of Japan, vol. 17, No. 299, P1552, Jun. 8, 1993 & JP5-20697.
Patent Abstracts of Japan, vol. 16, No. 562, P1456, Dec. 3, 1992 & JP4-216342.
H. Osterberg et al., "The Resolving Power of a Coated Objective" Journal of the Optical Society of America, vol. 39, No. 7, Jul. 1949 pp. 553-557.
J. E. Wilkins, Jr., "The Resolving Power of a Coated Objective II", Journal of the Optical Society of America, vol. 40, No. 4, Apr. 1950 pp. 222-224.

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