Method for determining type of optical disk and optical storage device
AssigneeSunplus Technology Co., Ltd.
InventorsWen-Chun Feng, Chien-Liang Yeh
Life of this patent
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Abstract
A method for determining a type of an optical disk includes following steps. A laser beam of a first type is focused on a disk to generate a first optical reflection signal. A first spherical aberration estimate is generated according to the degree of dispersion and strength of the first optical reflection signal. A laser beam of a second type is focused on the disk to generate a second optical reflection signal. A second spherical aberration estimate is generated according to the degree of dispersion and strength of the second optical reflection signal. The type of the disk is determined based on the first spherical aberration estimate and the second spherical aberration estimate.
Claims18
A method for determining a type of an optical disk, the method comprising:
- focusing a laser beam of a first type on the disk to generate a first optical reflection signal;
- generating a first spherical aberration estimate based on a degree of dispersion and strength of the first optical reflection signal, wherein the degree of dispersion of the first optical reflection signal is divided by the strength of the first optical reflection signal to obtain the first spherical aberration estimate;
- focusing a laser beam of a second type on the disk to generate a second optical reflection signal;
- generating a second spherical aberration estimate based on a degree of dispersion and strength of the second optical reflection signal, wherein the degree of dispersion of the second optical reflection signal is divided by the strength of the second optical reflection signal to obtain the second spherical aberration estimate;
- and
- determining the type of the disk based on the first spherical aberration estimate and the second spherical aberration estimate.
An optical storage device comprising:
- an optical pickup head respectively focusing a laser beam of a first type and a laser beam of a second type on a disk to generate a first optical reflection signal and a second optical reflection signal;
- and
- a control module generating a first spherical aberration estimate based on a degree of dispersion and strength of the first optical reflection signal and generating a second spherical aberration estimate based on a degree of dispersion and strength of the second optical reflection signal, the control module determining a type of the disk based on the first spherical aberration estimate and the second spherical aberration estimate, wherein the control module divides the degree of dispersion of the first optical reflection signal by the strength of the first optical reflection signal to obtain the first spherical aberration estimate, and the control module divides the degree of dispersion of the second optical reflection signal by the strength of the second optical reflection signal to obtain the second spherical aberration estimate.
Dependencies are inferred from the claim text.