Objective lens actuator having movements restricting control means for an optical head
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 17, 1988
Grant Date -
N/A
app pub date -
Oct 4, 1985
filing date -
Oct 4, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An objective lens actuator for an optical head. The objective lens has an optical axis. A first movable portion is adapted to move the objective lens in the focusing direction along the optical axis. The first movable portion includes an objective lens holder with a piston projecting from the objective lens in the direction of the optical axis. The objective lens holder secures the objective lens on the optical axis and supports a rectangular focusing coil and a four component tracking coil. A second movable portion is adapted to move the objective lens in a tracking direction, essentially perpendicular to the focusing direction and includes a guide hole shaped to slidably receive the first movable portion therein and to restrict movement of the first movable portion relative to the second movable portion to motion substantially along the focusing direction. A magnetic circuit drives the first and second movable portions in the focusing and tracking directions, respectively. The magnetic circuit includes two essentially parallel gaps, portions of the focusing and tracking coils being located in the gaps. Respective currents in the focusing and tracking coils cause the first and second movable portions to be urged in the focusing and tracking directions.
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