Funai Electric Company Ltd.

Kenshou Miyatake

Hirono Tsubota

Kouichi Kugo

An ultrasonic-motor-driving device is provided which allows fine adjustment of the periods of driving waves that are generated by a driving-wave-generating portion. A driving device for an ultrasonic motor includes a driving-wave-generating portion. The driving-wave-generating portion generates signals for driving piezoelectric elements included in the ultrasonic motor. The driving-wave-generating portion is constructed capable of generating rectangular waves including a plurality of rectangular waves with different periods.

Ultrasonic-motor-driving device and ultrasonic motor unit

There is provided an optical pickup device comprising a laser light source for emitting a laser beam, an object lens for focusing the laser beam onto the recording surfaces of layersandof an optical disk and condensing the laser beam onto the recording surfaces, photodetectors for receiving the laser beam reflected by the optical disk, and a diffraction grating for diffracting a part of the reflected laser beam toward the photodetectors, wherein data can be simultaneously written to layersand. The photodetector detects the reflected light from layerafter being refracted by the diffraction grating, and detects the reflected light from layerwithout being refracted, so that the data of layersandcan be simultaneously read. Thus, data can be simultaneously read from and written to the recording surfaces of a plurality of layers of an optical disk.

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Daito, Japan

Kenshou Miyatake