Optical pickup actuator circuit
AssigneeFunai Electric Co., Ltd.
InventorTsutomu Inada
Life of this patent
Estimating the term…
Abstract
An optical pickup actuator circuit includes: a lens holder 2 supported so as to be slidable along a support shaft and rotatable around the support shaft and for holding an objective lens 8 so that the objective lens 8 forms an image of a light beam on a desired track on an information recording surface of an optical disk; a focusing coil 7 attached to the lens holder 2; and a focusing magnet fixedly disposed so as to be opposite to the focusing coil 7; wherein two diodes D1 and D2 are parallel-connected in a forward direction between an input end 7a of the focusing coil 7 and the ground so that an input voltage not lower than a predetermined voltage is led to the ground by the two diodes D1 and D2.
Claims6
An optical pickup actuator circuit comprising:
- a lens holder supported so as to be slidable along a support shaft and rotatable around said support shaft and for holding an objective lens so that said lens forms an image of a light beam on a desired track on an information recording surface of an optical disk;
- a focusing coil attached to said lens holder;
- and
- a focusing magnet fixedly disposed so as to be opposite to said focusing coil;
- wherein two diodes are parallel-connected to said focusing coil so that an input voltage not lower than a predetermined voltage is led to the ground by said two diodes.
An optical pickup actuator circuit comprising:
- a lens holder supported so as to be slidable along a support shaft and rotatable around said support shaft and for holding an objective lens so that said lens forms an image of a light beam on a desired track on an information recording surface of an optical disk;
- focusing and tracking coils attached to said lens holder;
- and
- focusing and tracking magnets fixedly disposed so as to be opposite to said focusing and tracking coils respectively;
- wherein a semiconductor device is provided at each of said coils so that an input voltage not lower than a predetermined voltage is led to a ground by said semiconductor device.
An optical pickup actuator circuit, comprising:
- a lens holder for an objective lens which is freely movable in a vertical direction that moves apart from or toward tracks of an optical disk and in a direction that moves across the track;
- focusing and tracking coils attached to said lens holder;
- focusing and tracking magnets fixedly disposed so as to be opposite to said focusing and tracking coils, respectively;
- and
- diodes connected to one of said focusing and tracking coils for leading an input voltage of a predetermined voltage or more to a ground side.
Dependencies are inferred from the claim text.