Method for correcting tilt of magnet-optical readable medium apparatus to be used for its practice and magnet-optical readable medium
AssigneeFujitsu Limited
InventorTsutomu Tanaka
Life of this patent
Estimating the term…
Abstract
A tilt correction method carries out tilt correction by adjusting a magnet-optical readable medium. A tilt value is obtained by detecting crosstalk from a predetermined region of the magnet-optical readable medium, which is loaded with an apparatus to be used for practicing the tilt correction method. The tilt value is used to correct the tilt of the medium.
Claims6
A magnet-optical reproducing apparatus for reading information and correcting tilt of a loaded magnet-optical readable medium relative to a light beam, comprising:
- a loading part to which the magnet-optical readable medium is loaded;
- a detecting part for detecting the loading of said magnet-optical readable medium to said loading part and instructing the tilt correction operation;
- an optical head for receiving the reflected light of the light beam irradiated on the magnet-optical readable medium and converting the received reflected light to an electric signal;
- a tilt correction operating circuit for determining a crosstalk detecting signal from the electric signal of said optical head on receipt of an instruction to perform the tilt correction operation;
- a crosstalk detecting circuit for detecting the crosstalk from said crosstalk detecting signal;
- a tilt value calculating circuit for obtaining a tilt value of the magnet-optical readable medium based on the detected crosstalk;
- a tilt correction part for correcting the tilt of the magnet-optical readable medium based on said tilt value;
- and
- a magnetic field application apparatus for applying a magnetic field controlled by a magnetic field control part at the time of reproducing of the magnet-optical readable medium,
- wherein said magnetic field control part controls the magnetic field to be applied to said magnet-optical readable medium when said tilt correction operation is instructed.
A magnet-optical recording and reproducing apparatus for carrying out recording, reading, and erasing of information of a magnet-optical readable medium, comprising:
- a loading part on which the magnet-optical readable medium is loaded;
- a detection part for detecting the loading of the magnet-optical readable medium on said loading part and instructing a tilt correction operation;
- an optical head for receiving the reflected light of a light beam irradiated on the magnet-optical readable medium and converting the received reflected light to an electric signal;
- a tilt correction operating circuit for determining a crosstalk detecting signal from the electric signal of said optical head on receipt of an instruction to perform the tilt correction operation;
- a crosstalk detecting circuit for detecting the crosstalk from said crosstalk detecting signal;
- a tilt value calculating circuit for obtaining a tilt value of the magnet-optical readable medium based on the detected crosstalk;
- a tilt correction part for correcting the tilt of the magnet-optical readable medium based on said tilt value;
- and
- a magnetic field application apparatus for applying a magnetic field controlled by a magnetic field control part at the time of recording, reproducing and erasing the information of the magnet-optical readable medium, respectively,
- wherein said magnetic field control part controls the magnetic field to be applied to said magnet-optical readable medium when said tilt correction operation is instructed.
Dependencies are inferred from the claim text.