Light spot position control system and method by sampled servo

Details Light spot position control system and method by sampled servo Light spot position control system and method by sampled servo

1987-12-11

1989-10-03

Stephan, Steven L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 369124, G11B 700

Patent

active

048721522

ABSTRACT:
In a light spot position control system and method in which a control of the irradiation position of a light spot such as a focusing control, a jitter correction and/or a tracking control is made through a sampling control, a newly sampled error value is compared with a one-preceding sampled value. When a difference between both the values is within a range of a predetermined width, the newly sampled value is used as a new sample value as it is. When the difference exceeds the range of the predetermined width, a sum of the one-preceding sampled value and the predetermined width is used as a new sample value. Thereby, the influence of erroneous samples is reduced.

REFERENCES:
patent: 4138741 (1979-02-01), Hedlund et al.
patent: 4344165 (1982-08-01), Akiyama
patent: 4364118 (1982-12-01), Maeda et al.
patent: 4443870 (1984-04-01), Hazel et al.
patent: 4710909 (1987-12-01), Tsuyoshi et al.
patent: 4750163 (1988-06-01), Yamamiya et al.
SPIE, Sector Servo Data File Optical Disk Memory, Yonezawa et al, 1985, vol. 529, pp. 84-88.
Servo and Clock Sampling in the Optimem 1000, Miller, SPIE, 1985, vol. 529, pp. 140-144.

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