Method for determining existence of an optical disk in an optical disk drive
OwnerChien-Li Hunginventor
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Abstract
This present invention discloses a method for determining existence of a disk in an optical disk drive. Instead of using an optical pick-up head with a single laser wavelength, an optical pick-up head equipped with two different laser wavelengths is utilized to complete the determination of existence of a disk in an optical disk drive. Among the determining procedures, the formation of an S-curve containing the focus error signals is one basis for deciding the existence of a disk in the tray of the optical disk drive.
Claims10
A method for determining existence of a disk in an optical disk drive, the method comprising:
- focusing a laser beam of a first wavelength, and determining whether a disk is inserted into an optical disk drive according to generation of a first predetermined signal;
- and
- focusing a laser beam of a second wavelength, and determining whether a disk is inserted into an optical disk drive according to generation of a second predetermined signal.
A method for determining existence of a disk in an optical disk drive, the method comprising:
- utilizing a laser beam of a first wavelength to execute focusing and detecting generation of a first predetermined signal
- utilizing a laser beam of a second wavelength to execute focusing detecting generation of a second predetermined signal
- determining whether a disk is inserted into an optical disk drive according to generation of at least one of the first predetermined signal and the second predetermined signal.
The method of claim 7 wherein the laser beam of the first wavelength and the laser beam of the second wavelength are emitted from an optical pick-up head.
Dependencies are inferred from the claim text.