Error signal generation for light beam reflected from optical di

Details Error signal generation for light beam reflected from optical di Error signal generation for light beam reflected from optical di

1992-05-27

1994-02-15

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 4441, 369 54, G11B 7095

Patent

active

052873382

ABSTRACT:
A lens causes a first reflected light of a light beam reflected from an optical disk to converge on a first focal point. A splitter splits the first reflected light and causes a second reflected light to converge on a second focal point. The lens, the splitter, first and second light detectors are disposed so that the length of the light beam running from the lens to the second detector is different from the length of the light beam running from the lens to the first detector, and also, when the first reflected light is incident on the first detector, a line located within the illumination area formed on the first detector, which line corresponds to a center line of an information recording track formed on the optical disk, is substantially superimposed on a first boundary of the first detector, the illumination area being crossed by the second boundary, of the first detector, at some distance from the center point of the illumination area; and, when the second reflected light is incident, a line located within the illumination area formed on the second detector, which line corresponds to the center line of the information recording track formed on the optical disk, is substantially superimposed on a third boundary of the second detector, the illumination area being crossed by a fourth boundary of the second detector at some distance from the center point of the illumination area.

REFERENCES:
patent: 4682315 (1987-07-01), Vejima
patent: 5144606 (1992-09-01), Kadowaki
patent: 5151887 (1992-09-01), Miyazaki

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