Side-spot focus apparatus for optical disc recording and/or play

Details Side-spot focus apparatus for optical disc recording and/or play Side-spot focus apparatus for optical disc recording and/or play

1983-11-23

1986-05-20

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

250201, G11B 700

Patent

active

045905940

ABSTRACT:
Focus error due to drift from a specified value of the pointing angle of a focus laser light beam with respect to the reflective surface of an optical disc is self-compensated by employing two light beams derived from the same focus laser that have a substantially constant angular displacement therebetween. Any change due to drift in the specified value of the pointing angle of one light beam is accompanied by a substantially equal and opposite change due to drift in the specified value of the pointing angle of the other light beam.

REFERENCES:
patent: 4142209 (1979-02-01), Hedlund et al.
patent: 4301527 (1981-11-01), Tsunoda et al.
patent: 4374324 (1983-02-01), Rosmalen et al.
patent: 4425043 (1984-01-01), Rosmalen

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