Method and apparatus for recording optical information by varying recording pulse width
AssigneeTaiyo Yuden Co., Ltd.
InventorsToru Fujii, Ryou Negishi, Masahiko Hirano
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Abstract
A method and an apparatus capable of recording optical information at high density are disclosed. A recording pulse which includes a top pulse followed by a multiple pulse set is generated to form a pit, wherein, based on the distance from the top pulse, either pulse widths of pulses within the multiple pulse set are set to be sequentially smaller or pulse intervals of pulses within the multiple pulse set are set to be sequentially larger.
Claims20
A method for recording optical information on an optical information recording medium based on a digital signal which has a first intensity level representing a period for forming a pit and a second intensity level representing a period for not forming the pit, the method comprising the steps of:
- generating a recording pulse which includes a top pulse and a multiple pulse set following the top pulse while the digital signal corresponds to the first intensity level;
- and
- irradiating a laser beam onto the optical information recording medium based on the recording pulse, thereby forming an optically detectable pit having a length corresponding to the first intensity level,
- characterized in that pulse widths of pulses within the multiple pulse set are set to be sequentially smaller based on the distance from the top pulse.
A method for recording optical information on an optical information recording medium based on a digital signal which has a first intensity level representing a period for forming a pit and a second intensity level representing a period for not forming the pit, the method comprising the steps of:
- generating a recording pulse which includes a top pulse and a multiple pulse set following the top pulse while the digital signal corresponds to the first intensity level;
- and
- irradiating a laser beam onto the optical information recording medium based on the recording pulse, thereby forming an optically detectable pit having a length corresponding to the first intensity level,
- characterized in that pulse intervals of pulses within the multiple pulse set are set to be sequentially larger based on the distance from the top pulse.
An apparatus for recording optical information on an optical information recording medium based on a digital signal which has a first intensity level representing a period for forming a pit and a second intensity level representing a period for not forming the pit, the apparatus comprising:
- a recording pulse generator for generating a recording pulse which includes a top pulse and a multiple pulse set following the top pulse while the digital signal corresponds to the first intensity level, wherein pulse widths of pulses within the multiple pulse set are set to be sequentially smaller based on the distance from the top pulse;
- and
- a light source for irradiating a laser beam with a pulse shape onto the optical information recording medium based on the recording pulse, thereby forming an optically detectable pit having a length corresponding to the first intensity level on the optical information recording medium.
An apparatus for recording optical information on an optical information recording medium based on a digital signal which has a first intensity level representing a period for forming a pit and a second intensity level representing a period for not forming the pit, the apparatus comprising:
- a recording pulse generator for generating a recording pulse which includes a top pulse and a multiple pulse set following the top pulse while the digital signal corresponds to the first intensity level, wherein pulse intervals of pulses within the multiple pulse set are set to be sequentially larger based on the distance from the top pulse;
- and
- a light source for irradiating a laser beam with a pulse shape onto the optical information recording medium based on the recording pulse, thereby forming an optically detectable pit having a length corresponding to the first intensity level on the optical information recording medium.
Dependencies are inferred from the claim text.