Optical disk device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsKohei Nakata, Yasushi Kobayashi
Life of this patent
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Abstract
The present disclosure provides an optical disk device capable of reproducing data recorded on a high linear density optical disk stably. The optical disk device according to the disclosure is characterized by being equipped with a recording expected waveform generation circuit which generates, at the time of recording, an expected waveform that is expected to be obtained at the time of decoding; and a recording pulse generation circuit which generates a recording pulse for driving a laser with power and a time width suitable for an amplitude value of the recording expected waveform for each sampling point of the recording expected waveform.
Claims6
An optical disk device for recording and reproducing recording data on and from a track of an optical disk, comprising:
- an optical pickup having a laser of a wavelength λ and an objective lens having a numerical aperture N;
- a modulation circuit configured to generate, from the recording data, a modulated signal that is coded under a prescribed coding method;
- a recording expected waveform generation circuit configured to generate a recording expected waveform that is expected to be obtained in decoding the recording data from the track on which the modulated signal is recorded under a condition that a channel base length of the modulated signal is equal to L;
- and
- a recording pulse generation circuit configured to generate a recording pulse for driving the laser with power and a time width corresponding to an amplitude value of the recording expected waveform for each sampling point of the recording expected waveform,
- wherein the optical pickup records the recording data by applying laser pulses to the track based on the recording pulse.
Dependencies are inferred from the claim text.