Sony Corporation

Koichi Kobe

Takahiro Arakida

Osamu Maeda

Katsuhisa Daio

Hirofumi Nakano

Takeshi Yuwaki

Takehiro Taniguchi

Keiji Narusawa

A drive circuit and a drive current correcting method are described herein. The drive circuit comprises a current source that outputs a drive current, and a correction circuit that outputs a correction current. The correction circuit includes a first RC time constant circuit. An output terminal of the current source is connected to an output terminal of the correction circuit.

Correction circuit, drive circuit, light-emitting device and correction method of current pulse waveform

A correction circuit is provided, which may reduce dullness of a light output waveform due to wavelength detuning. The correction circuit includes an RC time constant circuit. The RC time constant circuit is used to correct a waveform of a current pulse outputted from a current source, the current source driving a surface-emitting semiconductor laser in a pulsed manner, so that a pulse waveform of light output of the semiconductor laser is approximately a rectangle.

Correction circuit, drive circuit, light emitting device, and method of correcting current pulse waveform

First and second integrating circuits are connected to both terminals of an impact sensor, and a difference between integration outputs of the integrating circuits is obtained by a differential amplifier. Voltage waveforms result from an input offset voltage in output terminals of the first and second integrating circuits and thereby cancel each other out. In essential impact detection, a comparator compares a differential output of the differential amplifier with a threshold level, whereby impact detection is performed.

Impact detecting circuit, impact detecting apparatus, and recording and reproducing apparatus including same

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Kanagawa, Japan

Koichi Kobe