JPS62252571A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To separate these even when a slider and a disk are adsorbed by the film of water molecules by rotating the disk at low speed at the time of starting the disk. CONSTITUTION:When a starting signal is inputted to a magnetic recorder, a disk 1 is rotated at the low speed of several ten rotations or below per minute. In such case, a pulse signal from a rotary encoder 10 fitted to a spindle 2 is counted by a control part 11, and when the disk 1 comes to be a constant rotational angle, this may be advanced up to the frequency of the stationary rotation. Consequently, while the slider 3 is allowed to contact with the disk, the disk 1 is stopped, the film of the water molecular is formed at the clearance between the disk 1 and the slider 3 and the disk and the slider are adsorbed, the disk 1 is rotated at low speed, by generating the relative sliding to the disk and the slider, the film can be separated by the low shearing force and thereafter, the disk 1 may be rotated at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording device that can prevent a slider and a disk from being adsorbed by a film of water molecules.

[Prior Art] Fig. 3 is a perspective view showing a conventional magnetic recording device, in which (1) is a disk for recording information, and (2) is a spindle for rotationally driving the disk (1). ,(3
) is a slider equipped with a magnetic core that records and reproduces information on the disk (1), (4) is this slider (3)
a suspension for pressing the disc (1),
(5) is an arm that supports the suspension (4);
) are floating shafts that rotatably support arm (5), (7) and (8
), (9) are a coil, a yoke, and a magnet for moving the slider (3) in the radial direction of the disk (1) by rotating the arm (5).

Next, the operation will be explained. Several disks are mounted on top of each other on a spindle (2) that rotates the disk (1), and are driven at a high speed of 2,700 to 3,800 revolutions per minute. This causes the slider (3) to record and reproduce information on the disk (1). When the disk (1) is stopped, the slider (3) is in contact with the disk (1), and as the rotation speed of the disk increases, the slider (3) begins to float away from the disk (+) and When the rotation speed reaches a steady rotation speed, a submicron-thick air film is formed between the slider (3) and the disk (1), and the slider (3)
and the disk (1) do not contact each other.On the other hand, when current is applied to the coil (7), the arm (5) is moved by a certain angle to the floating axis (
8) to move the slider (3) in the radial direction of the disk (1).

[Problems to be solved by the invention] Since the structure is more than that of the conventional RM magnetic recording device, when the disk (1) is stopped, the slider (3) does not come into contact with the disk (1). Therefore, if the disk (1) is left stopped for a long time or the surrounding relative humidity becomes high, the slider (3) and disk (1) may
Phenomenon of adsorption to
130) occurs, and if the disk (1) is rotated in this state, an excessive load will be applied to the suspension (4), resulting in damage to the slider (3) or disk (1), deformation of the suspension (4), etc. There was a problem.

This invention was made to solve the above-mentioned problems, and even if the slider and disk stick together, the disk can be driven without damaging the slider or disk or deforming the suspension. The purpose is to obtain a magnetic recording device.

[Means for Solving the Problems 1] The magnetic recording device according to the present invention includes a rotary encoder attached to a spindle to detect the rotation angle of the disk, and a rotary encoder that counts pulses from the encoder to control the rotation direction of the disk. It is equipped with a control section and a driver that rotationally drives the spindle.

[Function] The magnetic recording device according to the present invention, when starting the disk,
The adsorbed slider and disk are gradually separated by rotating the disk at low speed to generate relative slip between the slider and disk, and then, after the slider and disk begin to slide with a constant friction coefficient, the rotational speed of the disk is reduced. This is to increase the rotation speed to a steady state.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, symbols (1) to (5) are the same as those of the conventional device shown in FIG. (10) is a rotary encoder attached to the shaft end of the spindle (2) to detect the rotation angle of the disk (1), and (11) is a rotary encoder that counts pulse signals from the rotary encoder (10) to detect the rotation angle of the disk (1). (1) is a control unit for controlling the rotational direction of the spindle (2); and (12) is a driver for rotationally driving the spindle (2).

Next, the operation will be explained. When the activation signal is input to the magnetic recording device, the disk (1) rotates at a low speed of several tens of revolutions per minute or less. At this time, pulse signals from the rotary encoder (10) attached to the spindle (2) are counted by the control unit (11), and when the disk (1) reaches a certain rotation angle, the pulse signal is increased to a steady rotation speed. By the way, as shown in Figure 2, the slider (
3) is in contact with the disk, the disk (1) stops, water molecules II (13) are formed in the gap between the disk (1) and the slider (3), and the disk and slider are adsorbed. In such a case, by rotating the disk (1) at a low speed to cause relative sliding between the disk and the slider, the above III (1G) can be separated with a low shearing force, and then the disk (1) ) can be rotated at high speed.

In the embodiment, a low-return encoder (lO) is attached to the shaft end of the spindle (2), but the encoder may be built in the spindle, or the rotation angle of the disk (1) is not detected and the disk The same effect as described above can be obtained by rotating at a low speed for a certain period of time and then increasing the rotation speed to a steady state.

[Effects of the Invention] As explained above, according to the present invention, the disk is rotated at a low speed when the disk is started, so even if the slider and disk are attracted by a film of water molecules, it is possible to separate them. As a result, even when the disk is rotated, an excessive load is not applied to the suspension, and damage to the slider and suspension can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a magnetic recording device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state in which a slider and a disk are attracted to each other, and FIG. 3 is a perspective view of a conventional magnetic recording device. In the figure, (1) is a disk, (2) is a spindle, (3) is a slider, (4) is a suspension, (10) is a rotary encoder, (11) is a control unit, and (12) is a driver. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masuo Daiiwa Figure 1 1° U) Sufu 2 Nispi t'le 3 Nisrai 7-7; + r7. 12, ni-Rhinoma

Claims (1)

[Claims] A disk for recording information, a spindle for rotationally driving the disk, a magnetic head for recording and reproducing information on the disk, a slider to which the magnetic head is attached and scans the disk, and a suspension for supporting the slider. In a magnetic recording device equipped with a rotary encoder attached to a spindle to detect the rotation angle of the disk, and pulses from this encoder are counted,
A magnetic device comprising a control unit that controls the rotational direction of the disk and a driver that rotationally drives a spindle, and that when the disk is started, the disk is rotationally driven at a low speed to cause relative slippage between the slider and the disk. Recording device.