Mitsubishi Denki Kabushiki Kaisha

Yasushi Onooka

Hideki Hayashi

Kazuhiro Yamamoto

Tetsu Yamamoto

Junji Kawada

Shunji Yamanaka

Tomoaki Tsukada

Jiro Nakasu

Yuji Mitani

Kunio Kodaka

A switching system (,) has, in addition to an ordinary accounting function, an origination-only accounting control unit,to monitor the number of message units used by an origination-only portable telephone (,B) identified by a terminal identification number and to deny the origination of a call by the origination-only portable telephone (,B) upon the increase of the number of used message units to a predetermined number. The origination-only accounting control unit (,) accepts the origination of a call made by the origination-only portable telephone (,B) when a prescribed input about the origination-only portable telephone (,B) is given thereto by a system operator by operating a predetermined terminal device (,) or the like after the denial of origination of a call by the origination-only portable telephone (,B).

Portable telephone system

A retract mechanism for a magnetic head which can read from and/or write to a disk, the mechanism includes a spring arm which supports the head and urges the head toward the disk. The spring arm includes a cam follower which rides along the surface of the cam, which has two parallel horizontal surfaces and two incline surfaces. The spring arm is moved by an actuator in a radial direction along the disk. When the spring arm is moved radially away from the center of the disk, the cam urges the spring arm upwardly, thereby lifting the head up and away from the disk. As the spring arm continues to move radially away from the center of the disk, the cam guides the spring arm such that the head rests safely on a landing platform.

Read/write head retract mechanism

A dustproof type magnetic disc apparatus has structure for starting rotation of a magnetic recording medium, after driving a blower for dust separation for a predetermined time, by putting on a start switch for driving the magnetic recording medium.

Dustproof type magnetic disc apparatus

Growing community of inventors

Tokyo, Japan

Yasushi Onooka