Method and apparatus for detecting tracking error signal for opt

Details Method and apparatus for detecting tracking error signal for opt Method and apparatus for detecting tracking error signal for opt

1995-07-18

1997-03-18

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, G11B 7095

Patent

active

056129360

ABSTRACT:
According to a method and apparatus for detecting a tracking error signal for an optical disk of this invention, the tracking error signal is detected from a differential output of a pair of first photosensors arranged in areas in which a 0th-order component and .+-.1st-order components of a reflected beam incident on a track groove of a grooved optical disk are superposed. An offset signal of the tracking error signal is detected on the basis of outputs from a pair of second photosensors arranged between the first photosensors at a center of an area, of the 0th-order component, in which the 0th-order component is not superposed on the .+-.1st-order components, and the first and second photosensors are aligned in a tracking servo direction. The first and second photosensors are controlled to move on the basis of the detected offset signal.

REFERENCES:
patent: 5172355 (1992-12-01), Nagahara et al.
Patent Abstracts of Japan, vol. 17, No. 269, (P-1544), May 25, 1993, & JP5-6564.
"Push-pull tracking error detection using a pickup with polarizing hologram " by K. Kasazumi et al. , Extended Abstracts of Autumn Meeting of Jpn. Soc. Appl. Phys., Sep. 1994.

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