Optical recording device, optical recording method, and information recording medium
AssigneeHitachi, Ltd.
InventorsManabu Shiozawa, Yasuhiko Shimotsuma, Masaaki Sakakura, Kiyotaka Miura, Miki Nakabayashi
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Abstract
In a recording technique in which a plurality of light spots are simultaneously formed by using an ultra-short pulse laser and a spatial phase modulator, and a plurality of recording dots having refractive indexes different from those of the vicinities thereof are formed inside a recording medium, it is hard to make recording quality and a recording density compatible. Therefore, a plurality of dots are recorded at a predetermined dot pitch, and then other dots are recorded between the recorded dots.
Claims11
An optical recording method comprising:
- a first step of simultaneously forming a plurality of dots, which have refractive indexes different from refractive indexes of the vicinities thereof and have a predetermined dot pitch, in a single plane of a recording medium by applying laser light to inside of the recording medium via a spatial phase modulator to which a two-dimensional pattern is applied;
- and
- a second step, after the first step, of forming a plurality of next dots between neighboring ones of the formed dots formed in the first step in a same region of the single plane as the formed dots formed in the first step.
An optical recording apparatus comprising:
- a laser light source;
- a stage on which a recording medium is placed;
- a spatial phase modulator that is provided between the laser light source and the stage and to which a two-dimensional pattern for recording dots in the recording medium is applied;
- a condensing optical system that forms a plurality of light spots corresponding to the two-dimensional pattern and forms a plurality of dots having a predetermined dot pitch in a single plane inside the recording medium;
- and
- means for changing recording positions so that a plurality of next dots are recorded between neighboring ones of the recorded dots in a same region of the single plane as the recorded dots after forming the recorded dots.
An optical recording apparatus comprising:
- a laser light source;
- a stage on which a recording medium is placed;
- a spatial phase modulator that is provided between the laser light source and the stage and to which a two-dimensional pattern for recording dots in the recording medium is applied;
- and
- a condensing optical system that forms a plurality of light spots corresponding to the two-dimensional pattern and forms a plurality of dots having a predetermined dot pitch in a single plane inside the recording medium,
- wherein the spatial phase modulator is configured to change recording positions so that a plurality of next dots are recorded between neighboring ones of the recorded dots in a same region of the single plane as the recorded dots after forming the recorded dots.
Dependencies are inferred from the claim text.