Optical pickup assemblies and drive systems with the same
AssigneeThe Chinese University of Hong Kong
InventorsWei Hsin Liao, Kwong Wah Chan
Life of this patent
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Abstract
Disclosed are a pickup device assembly and an optical drive system. The assembly may comprise: a laser generator for generating laser beams; an objective lens; and at least one piezoelectric actuator for generating bending moments once applied with voltages, wherein the generated bending moments move the objective lens such that the laser beams are focused by the objective lens and then aim at concentric spiral data tracks of a disc with a strongest reflected signal of the laser beams from the disc.
Claims24
A pickup device assembly, comprising:
- a laser generator to generate laser beams;
- an objective lens;
- two piezoelectric actuators;
- and
- a damping layer arranged on one side of each of the two piezoelectric actuators,
- wherein once applied with voltages, the piezoelectric actuator generates bending moments to:
- move the objective lens in a horizontal direction such that the laser beams are focused by the objective lens and then aim at concentric spiral data tracks of a disc;
- and
- move the objective lens in a vertical direction such that the laser beams are accurately transmitted through the lens to the disc with a strongest reflected signal of the laser beams from the disc.
A pickup drive system, comprising:
- a laser generator for generating laser beams;
- an objective lens;
- at least one first actuator to provide the movement in tracking direction once applied with voltages to move the objective lens in a horizontal direction so as to implement a primary tracking motion, the at least one first actuator including a first piezoelectric actuator which comprises at least two piezoelectric layers;
- at least one second actuator to generate bending moments once applied with voltages to move the objective lens in a horizontal direction so as to implement a secondary tracking motion, the at least one second actuator including a second piezoelectric actuator which comprises at least two piezoelectric layers, wherein the primary tracking motion co-acts with the secondary tracking motion such that the laser beams are focused by the objective lens and then aim at concentric spiral data tracks of a disc;
- and
- a damping layer arranged on one side of each of the two actuators, and
- wherein the bending moments from the second actuator further make the objective lens move in a vertical direction such that the laser beams are accurately transmitted through the lens to the disc with a strongest reflected signal of the laser beams from the disc.
An optical drive system, comprising:
- two piezoelectric actuators;
- a lever beam arranged between the two piezoelectric actuators;
- an objective lens arranged on the lever beam;
- wherein there is provided with a damping layer on one side of each of the piezoelectric actuators, and there is provided with a constraining layer on one side of the damping layer.
An optical drive system, comprising:
- two piezoelectric actuators;
- a lever beam arranged between the two piezoelectric actuators;
- an objective lens arranged on the lever beam;
- wherein each of the piezoelectric actuators comprises at least two piezoelectric layers, and
- wherein at least one segment of damping layer and at least one segment of force transmission layer are alternately sandwiched between the piezoelectric layers.
Dependencies are inferred from the claim text.