Sony Corporation

Hidetaka Kodama

Motoi Kimura

Ryuya Tachino

Yasuyuki Takeshita

An information processing apparatus includes: a signal reproduction section configured to obtain a reproduced signal from a recording medium by radiating a laser beam emitted by a laser-beam source to the recording medium; and a high-frequency signal superposition section configured to superpose either a first high-frequency signal or a second high-frequency signal having a frequency higher than the frequency of the first high-frequency signal on a driving signal used for driving the laser-beam source, wherein, in a first signal reproduction operation, the high-frequency signal superposition section superposes the first high-frequency signal on the driving signal whereas, in a second signal reproduction operation to measure information on the amplitude of the reproduced signal, the high-frequency signal superposition section superposes the second high-frequency signal on the driving signal.

Information processing apparatus and information processing method

A recording/reproducing device includes an optical head unit which performs writing and reading of information expressed by marks and spaces on an optical recording medium by irradiating laser light onto the optical recording medium, a laser driving pulse generating unit that generates a laser driving pulse according to the recorded information to supply a laser driving signal to the optical head unit, and executes the irradiation of the laser light onto the optical head unit for recording, an evaluation value calculating unit that calculates a quality evaluation value, which is an index of recording signal quality based on a signal read from the optical recording medium by the optical head unit, and an adjustment controlling unit that performs an adjustment setting of the laser driving pulse generated in the laser driving pulse generating unit.

Recording/reproducing device and laser driving pulse adjusting method

A method for determining optimum write power for an optical disc in an optical disc recording apparatus includes, test writing the optical disc as a recording medium at a first position where a write sensitivity is higher than an average write sensitivity of the optical disc and at a second position where the write sensitivity is lower than the average write sensitivity by the same amount of difference as the difference between the write sensitivity at the first position and the average write sensitivity, using the same write power to the both of the first position and the second position, and obtaining an optimum write power for the optical disc from an average of a write characteristics of the test written positions.

Optical disc recording apparatus and method for determining optimum write power thereof

A laser drive includes a variable output voltage source that can control an output voltage, a laser source connected to the variable output voltage source, a laser drive circuit that drives the laser source, and a monitoring controller that monitors an operating voltage of the laser drive circuit and controls the output of the variable output voltage source such that the monitored operating voltage becomes equal to a desired value.

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Kanagawa, Japan

Hidetaka Kodama