Light spot position detector and optical head

Details Light spot position detector and optical head Light spot position detector and optical head

1991-08-13

1993-10-19

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

052552527

ABSTRACT:
A light spot position detector, which detects the two-dimensional position of a light spot projected onto a light receiving element with four quadrant light receiving parts, has an amplifier for amplifying detection signals transmitted from the respective light receiving parts individually, an arithmetic circuit for transmitting a first position signal and a second position signal corresponding to the two-dimensional position, and a variable resistor for adjusting the gains of the amplifier and the arithmetic circuit with respect to the detection signals. With this configuration, the amount of crosstalk between the first and second position signals is restrained within a given range, the crosstalk occurring when there are variations in gain of the amplifier and of the arithmetic circuit with respect to the respective detection signals. When the light spot position detector is incorporated into an optical head and the optical head is designed such that the movement of the objective lens causes a shift in the light spot, the displacement of the objective lens can be correctly detected, achieving accurate tracking control and focussing control.

REFERENCES:
patent: 3470377 (1969-09-01), Le Febre et al.
patent: 3954340 (1976-05-01), Blomqvist et al.
patent: 4001494 (1977-01-01), Adler et al.
patent: 5005163 (1991-04-01), Yamamoto et al.
patent: 5099468 (1992-03-01), Suzuki et al.

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