Method of adjusting a writing focus in an optical disc drive
AssigneeLite-On It Corporation
InventorChien-Chih Weng
Life of this patent
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Abstract
A method of adjusting a writing focus in an optical disc drive is disclosed. At first, the focus lens of the optical pick-up head is actuated make the focusing point of a laser beam focused on a number of predetermined positions, and a laser beam with a constant power is provided to write trial write data when the focusing point is in the predetermined positions. The trial write data is read and one of the predetermined positions is selected as the writing focus according to the reproduced trial write data.
Claims10
A method of adjusting a writing focus in an optical disc drive, comprising the following steps of:
- actuating a focus lens of an optical pick-up head to make the focusing point of a laser beam at a plurality of predetermined positions, and using the laser beam with a constant power to write a plurality of trial write data corresponding the predetermined positions;
- reading the trial write data;
- and
- selecting one of the predetermined positions as a writing focus according to the reproducing result of the trial write data.
A method of adjusting a writing focus in an optical disc drive, comprising the following steps of:
- providing a plurality of focusing positions and a laser power;
- using the laser power to write a trial write data at each focusing position;
- reproducing all of the trial write data;
- calculating the reproduced trial write data to obtain an optimum trial write data;
- and
- using the focusing position corresponding to the optimum trial write data as an optimum focusing position.
Dependencies are inferred from the claim text.