JPH02189772A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent destruction of recording information by using a moment of inertia of a magnetic disk and a rotor of a spindle motor as a power source, delivering the power to a magnetic head mechanism at interruption of power with the control of a solenoid and retreating the magnetic head. CONSTITUTION:A spindle motor 2 drives a magnetic disk 1 at a high speed at application of power, drives a pressing pulley 6 via a belt 5 and the pulley 6 is disconnected from a stepping motor 8 with a solenoid 7. The spindle motor 2 driven at a high speed keeps its rotation with moment of inertia at interruption of power while the number of revolutions is gradually decreased. On the other hand, the solenoid 7 opens the attraction of the pulley 6 at interruption of power to press the stepping motor 8 at its drive shaft, the stepping motor 8 drives a magnetic head mechanism 3 to moves the magnetic head 4 to the magnetic head floating stop region momentarily. Thus, at interruption of power, destruction of information due to wear or damage of the magnetic disk 1 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head evacuation mechanism for a magnetic disk device.

[Conventional technology]

Conventionally, in contact start/stop type magnetic disk drives that use a stepper motor to drive this type of magnetic head, the magnetic head and magnetic disk slide when starting or stopping, which can cause wear and damage to the magnetic disk. be.

For this purpose, an information recording area and a magnetic head suspension area are provided on the surface of the magnetic disk, and when starting or stopping, an electronic circuit controls a stepper motor that positions the magnetic head to move the magnetic head to the magnetic head suspension area. is adopted.

[Problem to be solved by the invention]

However, if the power is cut off while the magnetic disk device is in operation, the drive source for the stepper motor disappears, and the magnetic head slides to a stop in the information recording area of the magnetic disk. Therefore, valuable information is destroyed due to wear and tear on the magnetic disk.

[Means to solve the problem]

According to the present invention, a spindle motor that rotates a magnetic disk, a stepper motor that drives a magnetic head mechanism, a pressure pulley that is rotationally driven by the spindle motor via a belt, and a solenoid that drives the pressure pulley are provided. and the solenoid is arranged so as to press the pressing pulley against the rotating shaft of the stepper motor when the power is turned off.

〔Example〕

Next, the present invention will be described in more detail with reference to the drawings showing one embodiment of the present invention.

Referring to FIG. 1, one embodiment of the present invention includes a magnetic disk 1, a spindle motor 2 for rotating the magnetic disk 1, and a magnetic head mechanism 3 for positioning a magnetic head 4 at a desired position on the magnetic disk 1. and stepba motor 8
, a belt 5 that transmits the rotation of the spindle motor 2 , a pressure pulley 6 that transmits the rotational force provided by the belt 5 to the stepper motor 8 , and a solenoid 7 that controls the pressure pool 6 .

When the power is turned on, the spindle motor 2 rotates the magnetic disk 1 at high speed and also rotates the pressure pulley 6 via the belt 5. The pressure pulley 6 is separated from the stepper motor 8 by a solenoid 7.
The stepper motor 8 has no influence on the drive control of the magnetic head mechanism 3.

When the power is cut off, the power source for the spindle motor 2, which rotates at high speed, disappears, but the spindle motor 2 continues to rotate while gradually lowering its rotational speed due to the inertia of the rotating body.

On the other hand, the solenoid 7 releases the suction of the rotating pressing pulley 6 by turning off the power, the pressing pulley 6 is pressed by the rotating shaft of the stepper motor 8, the stepper motor 8 drives the magnetic head mechanism 3, and is attached to the magnetic head mechanism 3. The magnetic head 4 thus placed is instantly moved to a magnetic head suspension stop area provided on the magnetic disk 1.

The magnetic head mechanism 3 is provided with a stopper (not shown) that prevents it from moving beyond a predetermined position, and when the magnetic head 4 reaches the magnetic head floating stop area, the stepper motor 8 stops rotating, and the pressure pulley 6 is idling.

The shape, material, and pressing force of the pressing pulley 6 are arbitrarily determined by the driving force that rotates the stepper motor 8 in a power-off state and the inertial forces of the rotating bodies of the magnetic disk 1 and the spindle motor 2.

As described above, by utilizing the inertial force of the rotating bodies of the magnetic disk 1 and the spindle motor 2, even if the power source which is the power source of the magnetic disk drive is cut off, the inertial force is transferred to the pressing pulley 6 via the belt 5. The magnetic head 4 can be forcibly moved to the magnetic head suspension area of the magnetic disk 1 by transmitting the signal and driving the stellar motor 8 .

〔Effect of the invention〕

As explained above, according to the present invention, the power source is the inertia of the rotating body of the magnetic disk and the rotating motor, the belt and the pressing pulley are provided, and the power is transferred to the magnetic head mechanism when the power is turned off by controlling the solenoid. By transmitting the information to the magnetic head and forcibly retracting the magnetic head to a magnetic head suspension area provided on the magnetic disk, destruction of the recorded information can be prevented and a highly reliable magnetic disk device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial side sectional view of an embodiment of the present invention, and FIG. 2 is a perspective view of the embodiment. 1...Magnetic disk, 2...Spindle motor, 3
...Magnetic head mechanism, 4...Magnetic head, 5...
Belt, 6... Pressing pulley, 7... Solenoid, 8
...Stepba motor. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] It has a spindle motor that rotates a magnetic disk, a stepper motor that drives a magnetic head mechanism, a push pulley that is rotationally driven by the spindle motor via a belt, and a solenoid that drives the push pulley, and the solenoid is powered by a power source. A magnetic disk device characterized in that the pressing pulley is arranged so as to press against the rotating shaft of the stepper motor during cutting.