Device for and method of reducing cross talk in optical disk dev

Details Device for and method of reducing cross talk in optical disk dev Device for and method of reducing cross talk in optical disk dev

1991-08-06

1994-12-13

Young, W. R.

Boots, shoes, and leggings

369 4435, 369 4423, 2502015, G11B 700

Patent

active

053734378

ABSTRACT:
A device in which an offset is added to a focusing error signal to control an objective lens and thereby reduce the generation of cross-talk when a beam spot that is converged on an optical disk crosses over a wall of a groove of a track of the disk. By adding the offset to the focusing error signal, the objective lens is moved out of focus with the disk. Thus, the shape of a beam spot formed on a photo sensor is changed from a circle to an ellipse. A condenser lens provided for forming the beam spot is moved along the optical axis thereof in such a manner that an output of a recorded signal of the disk is at a maximum value. As a result, the objective lens is brought into focus on the disk. Thereafter, the objective lens is focused on the disk in accordance with the focusing error signal to which the offset is added, while maintaining the beam spot in the shape of an ellipse.

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patent: 5070494 (1991-12-01), Emoto et al.
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patent: 5099468 (1992-03-01), Suzuki et al.
Isailovic Jordan, "Videodisc and Optical Memory System," 1985, pp. 113-119.
Pohlmann, Ken C. "Principles of Digital Audio", 1985 pp. 241-244.

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