Optical disk apparatus for optically processing information
AssigneeKabushiki Kaisha Toshiba
InventorAkihiro Kasahara
Life of this patent
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Abstract
In an optical disk apparatus, an objective lens 29 is suspended movably along its optical axis by diaphragm structures and mounted on a carrier. The carrier is movably mounted on guide rails by a pair of support structures. In each of the support structures, two pair of rollers are rotatably fixed on first and second blocks, respectively, which are fixed to both ends of a leaf spring. The center portion of the leaf spring is fixed to the side surface of the carrier and gaps are provided between both ends of the leaf spring and the side surface of the carrier.
Claims12
A structure for supporting an objective lens movably along the optical axis of the lens, comprising:
- a lens holder for holding the objective lens;
- a frame;
- first and second diaphragms arranged substantially in parallel, a center part of the diaphragm suspending the lens holder movably along the optical axis, wherein each of said first and second diaphragms comprises:
- an outer frame connected to said frame;
- at least two spiral deformable spring elements connected between the outer frame and the center part of a corresponding one of said first and second diaphragms,
- wherein said first and second diaphragms are stacked together and rotated in a circumferential direction a predetermined phase from each other;
- a magnet unit, fixed to the lens holder, for generating a first magnetic field;
- and
- means, fixed to the frame, for generating a second magnetic field interlinked with the first magnetic field.
An apparatus for moving an objective lens linearly along an optical memory and moving the objective lens along the optical axis of the objective lens, comprising:
- a lens holder for holding the objective lens;
- first and second diaphragms arranged substantially in parallel, a center part of the diaphragms suspending the lens holder movably along the optical axis, each of the first and second diaphragms including an outer frame, and at least two spiral deformable Spring elements connected between the outer frame and the center part thereof, the first and second diaphragms being stacked together and rotated in a circumferential direction a predetermined phase from each other;
- a unit, fixed to the lens holder, for generating a first magnetic field,
- a frame to which the outer frames of the first and second diaphragms are fixed;
- means, fixed to the frame, for generating a second magnetic field interlinked with the first magnetic field;
- a carrier on which the frame is mounted;
- means for supporting the carrier movably;
- means for elastically coupling the carrier to the supporting means, said carrier, said supporting means and said coupling means being arranged symmetrically with respect to an axis crossing the optical axis;
- guide means for guiding the carrier, on which the supporting means is movably mounted, said guide means extending in the direction of movement of the carrier;
- and
- moving means for moving the carrier along the axis of movement.
Dependencies are inferred from the claim text.