Spherical aberration correction control
AssigneeMediatek Inc.
InventorsYung-chih Li, Chao-ming Huang
Life of this patent
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Abstract
A controller and a control method is provided to control a spherical aberration correcting device provided in an optical pick-up head to change a spherical aberration compensate value according to different controlling states during the spherical aberration correcting device changes the spherical aberration compensate value. For the mechanical type spherical aberration correcting device, the controlling states are the different speeds for the actuators to drive the lenses. For the liquid crystal type spherical aberration correcting device, the controlling states are the control values for the driver to drive liquid crystal spherical aberration corrector.
Claims22
A controller for controlling a spherical aberration correcting device used in an optical pick-up head of an optical disc system, said spherical aberration correcting device used for providing a spherical aberration compensate value, wherein said controller controls the spherical aberration correcting device with two or more controlling states during the spherical aberration correcting device changes the spherical aberration compensate value.
A method for controlling a spherical aberration correcting device used in an optical pick-up head of an optical disc system, said spherical aberration correcting device providing a spherical aberration compensate value for compensating the spherical aberration of the optical pick-up head, said method comprising:
- controlling the spherical aberration correcting device to change the spherical aberration compensate value with a first controlling state during the spherical aberration correcting device changes a spherical aberration compensate value from a first value to a second value;
- and
- controlling the spherical aberration correcting device to change the spherical aberration compensate value with a second controlling state different from the first controlling state during the spherical aberration correcting device changes a spherical aberration compensate value from the first value to the second value.
A method for controlling a mechanical spherical aberration correcting device used in an optical pick-up head of an optical disc system, said spherical aberration correcting device providing a spherical aberration compensate value for compensating the spherical aberration of the optical pick-up head, said method comprising:
- setting a specific driving speed profile including speed variation;
- and
- instructing the spherical aberration correcting device to change a spherical aberration compensate value from the first value to the second value according to the specific driving speed profile.
A method for changing a spherical aberration compensate value from a first value to a second value, said method comprising:
- setting a first driving speed for changing the spherical aberration compensate value from the first value to an intermediate value;
- and
- setting a second driving speed for changing the spherical aberration compensate value from the intermediate value to the second value.
Dependencies are inferred from the claim text.