Tilt detection system, tilt detection method and tilt adjustment method
AssigneeTEAC Corporation
InventorsAkira Mashimo, Keishi Ueno
Life of this patent
Estimating the term…
Abstract
A tilt detection system includes an optical disk having a series of data recorded therein, the series of data having a pulse width smaller than the minimum pulse width of data recorded in an ordinary optical disk; a reproducing part reproducing a signal from the optical disk by emitting a light beam onto the optical disk; and a tilt detecting part detecting a tilt of the light beam with respect to the optical disk based on a reproduced RF signal provided by the reproducing part when the series of data having the smaller pulse width is reproduced.
Claims4
A tilt detection system comprising:
- a reproducing part reproducing a signal from an optical disk by emitting a light beam onto said optical disk;
- a low-pass filter having a gain decreased for the highest frequency of predetermined essential frequencies of a reproduced RF signal provided by said reproducing part;
- and
- a tilt detecting part detecting a tilt of the light beam with respect to the optical disk based on the signal having said highest frequency having passed said low-pass filter.
An optical disk drive comprising:
- a reproducing part reproducing a signal from an optical disk by emitting a light beam onto said optical disk;
- a low-pass filter having a gain decreased for the highest frequency of predetermined essential frequencies of a reproduced RF signal provided by said reproducing part;
- and
- a tilt detecting part detecting a tilt of the light beam with respect to the optical disk based on the signal having said highest frequency having passed said low-pass filter.
A tilt detection method comprising the steps of:
- a) reproducing a signal from an optical disk by emitting a light beam onto said optical disk through a reproducing part of an optical disk drive;
- b) decreasing a gain of a low-pass filter of said optical disk drive having for the highest frequency of predetermined essential frequencies of a reproduced RF signal provided by said reproducing part;
- and
- c) detecting a tilt of the light beam with respect to the optical disk in said reproducing part based on the signal having said highest frequency having passed said low-pass filter.
A tilt adjustment method comprising the steps of:
- a) reproducing a signal from an optical disk by emitting a light beam onto said optical disk through a reproducing part of an optical disk drive;
- b) decreasing a gain of a low-pass filter of said optical disk drive having for the highest frequency of predetermined essential frequencies of a reproduced RF signal provided by said reproducing part;
- c) detecting a tilt of the light beam with respect to the optical disk in said reproducing part based on the signal having said highest frequency having passed said low-pass filter;
- and
- d) adjusting a mechanical configuration of said optical disk so that the tilt detected in said step c) is minimized.
Dependencies are inferred from the claim text.