Information recording apparatus
AssigneesHitachi, Ltd., Hitachi Maxell, Ltd.
InventorsHideki Saga, Hirofumi Sukeda, Takehiko Yorozu
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Abstract
An information recording apparatus capable of forming a fine mark reliably and highly precisely through compensation for thermal interference and heat accumulation. The information recording apparatus is provided with a recording energy irradiating unit for generating at least two recording waveforms when marks of the same length or spaces of the same length in a channel data sequence are recorded. The information recording apparatus constructed as above can realize highly reliable recording/reproducing operations and can be made compact at a low cost with a large storage capacity.
Claims2
An information recording apparatus for recording data by applying energy to a recording medium to form thereon local physical changes of the medium, the information recording apparatus comprising:
- a comparator for judging whether a mark length of a mark immediately preceding a space in a recording waveform for applying energy is shortest or not;
- and
- a waveform encoder for changing a duration of a first period at a first level provided at the start of the space in accordance with an output from said comparator, the first period being followed by a second period at a second level higher than the first level.
An information recording method for recording data by applying energy to a recording medium to form thereon local physical changes of the medium, the information recording method comprising the steps of:
- judging whether a mark length of a mark immediately preceding a space in a recording waveform for applying energy is shortest or not;
- and
- if shortest, setting a duration of a first period at a first level provided at the start of the space to Tb1, whereas if not shortest, setting the first period longer than Tb1, the first period being followed by a second period at a second level higher than the first level.
Dependencies are inferred from the claim text.