Ricoh Company, Ltd.

Shuichi Honda

Yasushi Okada

Hideo Inuzuka

A drive voltage control device includes a first drive power source to supply a first drive voltage to a first driver and a second driver connected to the first driver in series; a second drive power source to supply a second drive voltage; a voltage dropper; a first switching circuit, a second switching circuit, a third switching circuit, a third switching circuit, and a fourth switching circuit. The first switching circuit includes a first switching element between the first drive power source and the voltage dropper on the drive voltage line, and first circuitry configured to switch the first switching element between ON and OFF. The second switching circuit includes a second switching element between the second drive power source and the voltage dropper on the drive voltage line; and second circuitry configured to switch the second switching element between ON and OFF.

Drive voltage control device, drive voltage control device for fan motor, and image forming apparatus

In a disk drive unit, a top cover, a front cover and a loading base attached with a body module cooperatively form a substantially closed receiving space for an optical disk. The front cover is provided with a dustproof shutter which closes the foregoing receiving space except upon insertion or ejection of an optical disk cartridge including therein the optical disk. Further, a dustproof cap is attached to the body module so as to cover the underside of the body module where a circuit board is disposed for processing signals relative to an optical head. A hermetically closed space is formed between the underside of the body module and the dustproof cap, in which the circuit board is accommodated.

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Kanagawa, Japan

Shuichi Honda