Nippon Hoso' Kyokai

Kabushiki Kaisha Sankyo Seiki Seisakusho

Tamotsu Mitsuyasu

Takuji Sekiguchi

Kazuo Abe

Daiichirou Katou

Toshihiko Okina

Masaki Gotoh

Tsuneharu Hashizume

Hitoshi Yanagisawa

Mitsutaka Miyashita

A head drum apparatus includes a cylindrical piezoelectric ceramic member formed of a polarized ceramic material and having inner and outer peripheral surfaces. A plurality of electrodes are formed on at least one of the inner and outer peripheral surfaces of the piezoelectric ceramic member. The piezoelectric ceramic member vibrates in response to an AC voltage applied to the electrodes. A cylindrical stationary head drum having an inner peripheral surface and an outer peripheral surface around a portion of which a magnetic tape is wound is caused to vibrate in a bending mode under vibration of the piezoelectric ceramic member. The stationary head drum includes a cylindrical stationary portion, a cylindrical vibratory portion and a cylindrical thin wall portion provided between the stationary portion and the vibratory portion. The piezoelectric ceramic member is coupled to the vibratory portion so that the vibratory portion is caused to vibrate under vibration of the piezoelectric ceramic member. Tape data indicative of types of the tapes is read out for driving the piezoelectric ceramic member by the AC voltage having a frequency and an amplitude determined on the basis of the tape data.

Head drum apparatus

Tape drive mechanism

Growing community of inventors

Tokyo, Japan

Tamotsu Mitsuyasu