Optical information recording and reproducing apparatus
AssigneePioneer Corporation
InventorsMitsuru Sato, Takanori Maeda
Life of this patent
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Abstract
An optical information recording and reproducing apparatus is provided that is capable of preventing recorded data from being deleted by mistake under a recording operation mode, and, under a reproduction operation mode, is capable of highly accurately reproducing and reading information data in which crosstalk has been removed. Under the reproduction operation mode, a single laser beam is divided into a plurality of divided laser beams, and they are individually irradiated onto a recording medium. On the other hand, under the recording operation mode, the quantity of light of each divided laser beam other than one beam of all the divided beams is reduced lower than that of the one beam, and they are all irradiated onto the recording medium.
Claims12
An optical information recording and reproducing apparatus for recording information on a recording medium and reproducing the information from the recording medium by irradiating a beam onto the recording medium, which comprises:
- a laser generating element for generating a single laser beam;
- and
- a laser beam irradiating means for, in a reproduction operation mode, dividing the laser beam into a plurality of divided laser beams and irradiating the divided laser beams onto the recording medium individually, while, in a recording operation mode, decreasing quantity of light of all but one beam of the divided beams so as to be lower than that of the one beam and irradiating the divided laser beams onto the recording medium.
An optical information recording and reproducing apparatus for recording information on a recording medium and reproducing the information from the recording medium by irradiating a beam onto the recording medium, which comprises:
- a laser generating element for generating a single laser beam;
- a laser beam irradiating means for dividing the single laser beam into a main beam and secondary beams and irradiating the main and secondary beams simultaneously onto respective recording tracks, that are formed contiguously to each other on a recording surface of the recording medium;
- and
- control means for controlling said laser beam irradiating means so as to reduce the quantity of light of the secondary beams to become lower than that of the main beam under a recording operation mode.
An optical information recording and reproducing apparatus for recording information on a recording medium and reproducing the information from the recording medium by irradiating a beam onto the recording medium, which comprises:
- a laser generating element for generating a single laser beam;
- laser beam irradiating means for dividing the single laser beam into a main beam and a secondary beam and irradiating the main and secondary beams simultaneously onto recording tracks, respectively, that are formed contiguously to each other on a recording surface of the recording medium;
- control means for controlling said laser beam irradiating means so as to reduce a quantity of light of the secondary beam to be lower than that of the main beam in a recording operation mode;
- and
- laser power adjusting means for, in a reproduction operation mode, adjusting an optical power of the laser beam generated by said laser generating element to a first optical power value optimal for reading information, and, in a shift from the reproduction operation mode to the recording operation mode, switching the optical power of the laser beam generated by said laser generating element to a second optical power value needed for recording the information after an optical power of the secondary beam has decreased to a predetermined value.
Dependencies are inferred from the claim text.