Objective lens actuator using a balance weight therein
AssigneeCanon Kabushiki Kaisha
InventorKikuo Yoshikawa
Life of this patent
Estimating the term…
Abstract
An objective lens actuator in which an objective lens for focusing a light beam on a recording medium is held in a lens holder, and the objective lens holder is held on a support shaft to be slidable in a direction of the optical axis of the objective lens and pivotal on a plane perpendicular to the optical axis direction includes a balance weight located on the holder to be substantially axially symmetrical with the objective lens. The balance weight includes a balance weight body having a predetermined mass, and a damper for supporting the balance weight body in the lens holder and for damping a vibration of the lens holder in cooperation with the balance weight body.
Claims17
An objective lens actuator in an optical pickup device in which an objective lens for focusing a light beam on a recording medium is held in a lens holder, and said objective lens holder is held on a support shaft to be slidable in a direction of an optical axis of said objective lens and pivotal on a plane perpendicular to the optical axis direction, comprising:
- a balance weight located on said holder to be substantially axially symmetrical with said objective lens, said balance weight comprising a balance weight body having a predetermined mass, and a damper member arranged between said balance weight body and said lens holder.
An objective lens actuator in an optical pickup device having a lens supporter holding an objective lens for focusing a light beam on a recording medium and being movable in a direction of an optical axis of said objective lens, comprising:
- a balance weight located on said lens supporter, said balance weight comprising a balance weight body having a predetermined mass, and a damper member arranged between said balance weight body and said lens supporter.
An optical information recording and reproducing apparatus utilizing a light beam for performing at least one of recording information on a recording medium and reproducing the information recorded on the recording medium, comprising:
- an objective lens for focusing a light beam on said recording medium;
- a lens holder for holding said objective lens;
- a support shaft for holding said objective lens holder thereon to be slidable in a direction of an optical axis of said objective lens and pivotal on a plane perpendicular to the optical axis direction;
- a balance weight located on said holder to be substantially axially symmetrical with said objective lens, said balance weight comprising a balance weight body having a predetermined mass, and a damper member arranged between said balance weight body and said lens holder;
- and
- a lens holder drive means for generating a drive force for causing said lens holder to be slidable in a direction of an optical axis of said objective lens and pivotal on a plane perpendicular to the optical axis direction.
An optical information recording and reproducing apparatus utilizing a light beam for performing at least one of recording information on a recording medium and reproducing the information recorded on the recording medium, comprising:
- an objective lens for focusing a light beam on said recording medium;
- a lens supporter slidable in a direction of an optical axis of said objective lens for holding said objective lens;
- a balance weight located on said supporter, said balance weight comprising a balance weight body having a predetermined mass, and a damper member arranged between said balance weight body and said supporter;
- and
- supporter drive means for generating a drive force for causing said supporter to be slidable in a direction of an optical axis of said objective lens.
An objective lens actuator in an optical pickup device having a lens supporter holding an objective lens for focusing a light beam on a recording medium and being movable on a plane perpendicular to an optical axis direction of said objective lens, comprising:
- a balance weight located on said supporter, said balance weight comprising a balance weight body having a predetermined mass, and a damper member arranged between said balance weight body and said supporter.
An optical information recording and reproducing apparatus utilizing a light beam for performing at least one of recording information on a recording medium and reproducing the information recorded on the recording medium, comprising:
- an objective lens for focusing a light beam on said recording medium;
- a lens supporter being movable on a plane perpendicular to an optical axis direction of said objective lens for holding said objective lens;
- a balance weight located on said supporter, said balance weight comprising a balance weight body having a predetermined mass, and a damper member arranged between said balance weight body and said supporter;
- and
- supporter driving means for generating a driving force for moving said supporter on a plane perpendicular to the optical axis direction of said objective lens.
Dependencies are inferred from the claim text.