A mechanism for preventing propagation of driving motor noise and vibration on a tape deck, comprising:</claim-text> a deck chassis, a pinch roller and a capstan axis for conveying a tape, a motor which is mounted on said deck chassis for driving capstan axis, a cylinder drum which is mounted on said deck chassis and provided with a head for magnetic-recording and playing on the tape; said motor being a direct driving motor in which a motor shaft is directly coupled to the capstan axis, and which is controlled by current switching; said motor being electrically insulated from said deck chassis; said direct driving motor controlled by a pulse width modulation (PWM) control; and said direct driving motor including a rotational axis as a capstan axis, a rotor which is mounted on said rotational axis, a stator core which is wounded by a coil being supplied PWM control current and faces to said rotor, and a bearing holder which holds said stator core and supports said rotational axis, and said direct driving motor is mounted through said bearing holder on the deck chassis; wherein said bearing holder is made of an insulating material. view more

The mechanism for preventing propagation of driving motor noise and vibration on a tape deck according to claim 1, wherein said direct driving motor is mounted on said deck chassis through an insulating material.

The mechanism for preventing propagation of driving motor noise and vibration on a tape deck according to claim 1, wherein said cylinder drum is mounted on said deck chassis through an insulator.

A tape deck which comprises the mechanism for controlling driving motor noise and vibration on a tape deck according to claim 1.

A mechanism for preventing propagation of driving motor noise and vibration on a tape deck comprising a deck chassis, a pinch roller and a capstan axis for conveying a tape, a motor which is mounted on said deck chassis for driving said capstan axis, and a cylinder drum which is mounted on said deck chassis and provided with a head for magnetic-recording and playing on the tape: wherein said motor is a direct driving motor in which a motor shaft is directly coupled to the capstan axis, and which is controlled by current switching; wherein said motor comprises a rotational axis as a capstan axis, a rotor which is mounted in said rotational axis, a stator core which is wound by a coil being supplied switching control current and faces to said rotor, a bearing holder which is made of an insulating material for holding said stator core and supporting said rotational axis, and a motor PCB (printed circuit board) which is supported by said bearing holder and on which circuit elements for controlling the motor are mounted, and wherein said motor is secured on the deck chassis through the bearing holder; and, wherein said motor PCB is held in close to where the bearing holder is mounted on the deck chassis, and supported by a supporting member in an electrically insulating state at a distance from where the motor PCB is held. view more

The mechanism for preventing propagation of driving motor noise and vibration on a tape deck according to claim 5, wherein said direct driving motor is controlled by a pulse width modulation (PWM) control.

The mechanism for preventing propagation of driving motor noise and vibration on a tape deck according to claim 6, wherein said supporting member is composed of a projection which is provided toward the motor PCB on said deck chassis and made of an insulating material. view more

The mechanism for preventing propagation of driving motor noise and vibration on a tape deck according to claim 6, wherein said supporting member is an extended part of an insulating holder for holding members which are mounted on said deck chassis.

The mechanism for preventing propagation of driving motor noise and vibration on a tape deck according to claim 6, wherein said supporting member is composed of a projection formed on the deck chassis, and an insulating material intervened between said projection and said motor PCB. view more

A tape deck which is provided with the mechanism which suppresses driving motor noise and vibration on a tape deck according to claim 6.

The loading mechanism as set forth in claim 2, wherein said gear mechanism includes a rack portion formed on said slide arm and a pinion portion formed on said holder drive gear to engage with said rack portion, and said rack portion and said pinion portion are disengaged while said slide arm is positioned between said second and said third positions. view more

A biasing/erasing oscillator in a magnetic tape recording apparatus having an entire width erasing head for erasing signals recorded in an azimuth track, or the azimuth track and a linear track, of a magnetic tape, and a linear record erasing head for erasing signals recorded in the linear track of the magnetic tape, comprising: a series circuit connecting in series through a series junction point at least between said linear record erasing head and one of said entire-width erasing head and an inductance element; an oscillating capacitor connected in parallel with said series circuit; a transistor having a collector and a base and having an emitter connected to said series junction point; a direct current blocking capacitor connected between one end of said series circuit and said base; and a bias resistor for providing a bias voltage to said base. view more

An oscillator according to claim 1, wherein said inductance element is an inductor.

An oscillator according to claim 3, wherein said series circuit includes two erasing heads of said entire-width erasing head and said linear record erasing head and said inductor, said series junction point is a junction point between said two erasing heads and said inductor. view more

A biasing/erasing oscillator in a magnetic tape recording apparatus having an entire width erasing head for erasing signals recorded in an azimuth track, or the azimuth track and a linear track, of a magnetic tape, and a linear record erasing head for erasing signals recorded in the linear track of the magnetic tape, comprising: a series circuit connecting in series through a series junction point said entire-width erasing head and said linear record erasing head; an oscillating capacitor connected in parallel with said series circuit; a transistor having a collector and a base and having an emitter connected to said series junction point; a direct current blocking capacitor connected between one end of said series circuit and said base; and biasing means providing a bias voltage to said base. view more