Optical disk device and tilt correction method
AssigneeRicoh Company, Ltd.
InventorsMasaki Ninomiya, Takehide Ohno
Life of this patent
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Abstract
An optical disk device and a tilt correction method capable of high precision tilt correction with a smaller number of measurement positions are provided. Prior to data recording and reproduction, a number of measurement positions are set in the radial direction on an optical disk with intervals between two adjacent measurement positions shorter and shorter from the inner region to the peripheral region of the optical disk. The tilt at each of the measurement positions is measured, and the resulting tilt data are stored in a memory. The tilt data are used for making tilt corrections when recording or reproducing data on the optical disk.
Claims7
An optical disk device, comprising:
- an optical pickup that irradiates a laser beam onto a rotating optical disk;
- a tilt measurement unit configured to measure a tilt of the optical pickup relative to the optical disk at a preset measurement position;
- and
- a tilt correction unit configured to perform correction at the preset measurement position using tilt data measured at the preset measurement position,
- wherein:
- the optical pickup is moved and set at a plurality of the preset measurement positions in a radial direction on the optical disk, and the tilt measurement unit measures the tilt at each of the preset measurement positions, intervals between adjacent two of the preset measurement positions being set shorter and shorter from an inner region to a peripheral region of the optical disk.
A tilt correction method for correcting a tilt of an optical disk relative to an optical pickup in an optical disk device wherein the optical pickup irradiates a laser beam onto the optical disk, comprising:
- a first step of moving the optical pickup and setting the optical pickup at a plurality of preset measurement positions in a radial direction on the optical disk, intervals between adjacent two of the preset measurement positions being set shorter and shorter from an inner region to a peripheral region of the optical disk;
- a second step of measuring the tilt at each of the preset measurement positions;
- and
- a third step of performing tilt correction at each of the preset measurement positions using corresponding measured tilt data.
Dependencies are inferred from the claim text.