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AssigneeHitachi, Ltd.
InventorsFumiyoshi Kirino, Takeshi Maeda, Hiroshi Ide, Toshimitsu Kaku, Seiichi Mita, Kazuo Shigematsu, Tsuyoshi Toda
Estimating the term…
In a write control method on an optical recording, at least one shift amount selected from the defocus amount of a laser beam on a recording medium, the shift amount of a recording position on a recording track and the shift amount of laser power during recording is controlled such that the selected amount falls within a predetermined range. Subsequently, a trial signal is trially recorded at a plurality of trial zones on the recording medium by using a laser power value as a parameter. The recorded trial signal is read and a difference .DELTA.V between center levels of a highest density waveform and a lowest density waveform is detected. In connection with each trial zone, the laser power value when a reading trial signal which makes the difference .DELTA.V minimum is recorded is defined as an optimum recording power value. Regular data is recorded at a predetermined storage area on the recording medium by using an optimum laser power value determined in connection with a trial zone closest to the predetermined storage area.
A control method of recording at magneto-optical recording wherein when recording, reading or erasing of optical recording is performed by using at least a laser beam and an externally applied magnetic field, a low recording level portion having a predetermined duration is provided between adjacent recording pulses, and more preferably, heat flow generated from a recording pulse is controlled by said portion to suppress interference due to heat between respective recording marks.
A method of controlling recording of optical records, comprising the steps of:
A control method of data recording and reading of information, comprising the steps of:
A control method of data recording of magneto optical recording wherein when performing recording, reading and erasing operations by using at least a laser beam and an externally applied magnetic field, a laser beam recording pulse for each respective mark to be recorded being divided and provided in the form of intermittent and fine pulses irradiated on a recording medium to control flow of heat diffusing in said recording medium to thereby control the width and length of a magnetic domain to be formed.
A control method of recording of magneto optical recording wherein when recording, reading and erasing operations are performed by using at least a laser beam and an externally applied magnetic field, a recording pulse used for each respective recording mark is comprised of a separate pre-heat region and at least two separate data recording regions.
The control method of a magneto-optical recording wherein when recording, reading or erasing of optical recording is performed by using at least a laser beam and an externally applied magnetic field, a recording pulse used is comprised of a separate pre-heat region and at least two separate data recording regions, a low recording level portion having a predetermined duration is provided between adjacent recording pulses, and setting values of all low recording level portions or a setting value of at least one low recording level portion is changed independently or cooperatively in accordance with a recording medium used or a use ambient condition.
Dependencies are inferred from the claim text.