Disc focus servo-circuit with ordered reference level setting me

Details Disc focus servo-circuit with ordered reference level setting me Disc focus servo-circuit with ordered reference level setting me

1986-02-25

1988-04-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

047406798

ABSTRACT:
In order to focus light beams which are projected onto an optical recording medium, the focusing optical system is moved in a vertical direction to the surface of the recording medium. A focus error signal produced by receiving the light returning from the recording medium is compared in turn with a predetermined plurality of reference levels. A focus servo-means is operated when this signal reaches the reference level within the focus pull-in region after passing through a predetermined order of reference levels.

REFERENCES:
patent: 4446546 (1984-05-01), Miller
patent: 4541084 (1985-09-01), Oku et al.
patent: 4544837 (1985-10-01), Tanaka et al.

Affiliated with

Also associated with

Rating

Disc focus servo-circuit with ordered reference level setting me does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disc focus servo-circuit with ordered reference level setting me, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disc focus servo-circuit with ordered reference level setting me will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-821477