Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-08-15
1992-06-09
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4426, 369 4435, 369 47, 2502015, G11B 700
Patent
active
051213753
ABSTRACT:
A tracking error detector circuit to maintain correct disk tracking on high density disks provided within an apparatus for playing a prerecorded disk. The disk contains two carrier signals with frequencies f.sub.1 and f.sub.2, which are alternately superimposed onto an information signal each rotation of the prerecorded disk. The tracking error detection circuit includes circuitry to determine, as a first error signal, the difference in amplitude between the f.sub.1 frequency components of the tracking sub-beams, and between f.sub.2 frequency components of the tracking sub-beams. The detection circuit further includes a sensor to detect one rotation of the prerecorded disk and a selection circuit, which alternately selects the first and second error signals each time the rotation sensor detects a disk revolution. This selected error signal acts as the tracking error signal for the succeeding revolution of the disk.
REFERENCES:
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patent: 4660191 (1987-04-01), Maeda et al.
patent: 4744070 (1988-05-01), Takemura et al.
patent: 4750162 (1988-06-01), Tajima
patent: 4875203 (1989-10-01), Nagashima et al.
Patent Abstracts of Japan, vol. 7, No. 105 (P-195)(1250) May 7, 1983 (JPA 58-26369).
Patent Abstracts of Japan, vol. 6, No. 116 (P-125)(994) Jun. 29, 1982 (JPA 57-44238).
Envall Jr. Roy N.
Pioneer Electronic Corporation
Tran Thang V.
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