Tracking error signal detecting device with a two-beam system fo

Details Tracking error signal detecting device with a two-beam system fo Tracking error signal detecting device with a two-beam system fo

1987-02-27

1987-12-08

Cardillo, Raymond F.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 44, 369124, G11B 709, G11B 7095

Patent

active

047122064

ABSTRACT:
A tracking error signal is detected by irradiating an information pattern recorded on an information carrying member with first and second light beams, the second light beam being incident on the information carrying member at a position which is spaced from the incidence position of the first light beam at least in the direction orthogonal to the tracing direction of the information pattern, the light beams modulated by the information pattern being independently photoelectrically converted, an envelope-detection being effected with respect to the outputs obtained by the conversion, and on the basis of the output signals formed by the envelope-detection, the tracking error signal being produced.

REFERENCES:
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patent: 4243848 (1981-01-01), Utsumi
patent: 4243850 (1981-01-01), Edwards
patent: 4290122 (1981-09-01), Bates et al.
patent: 4338682 (1982-07-01), Hosaka et al.
patent: 4340950 (1982-07-01), Kosaka
patent: 4426690 (1984-01-01), Motoyama
patent: 4476555 (1984-10-01), Joichi et al.
patent: 4506149 (1985-03-01), Utsumi
patent: 4539665 (1985-09-01), Iso et al.

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