JPS628377A - Head moving damper device - Google Patents

Abstract

PURPOSE:To decrease access time by providing a plate spring with tip weight fitted so as to be tilted in the magnetic head moving direction to a carriage mounted with a magnetic head moved for magnetic recording and reproduction on a magnetic disc. CONSTITUTION:A weight 42 is fitted to the tip of a plate spring 41 stuck with a damping member of a viscocious friction type damper at a straight moving part of a head feeding mechanism of a magnetic disc device. The vibrating damping when a pulse motor enters the fixed power application is quickened and the time reaching read/write enable state is reduced after track movement when the head feeding mechanism moves a head from one track on the disc to the other track after number of pulses in response to the track number to be moved is finished for giving to the pulse motor by fitting a sub vibrating system whose resonance frequency is nearly coincident with the resonance frequency of the main vibrating system itself to the main vibrating element of the vibrating system comprising the load inertial including the equivalent spring at fixed power application to the pulse motor and the rotor of the pulse motor itself.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a head movement damper device for a magnetic disk device used as an external storage device for information processing devices such as personal computers and word processors.

BACKGROUND ART FIG. 3 is a block diagram showing the basic configuration of a general magnetic disk device. 1 is a pulse motor that generates a rotational angular movement and is also capable of maintaining an angle, and is attached to the structure 6 with the rotational motion to linear motion conversion device 2 and the fixture 5 biased. Reference numeral 7 denotes a magnetic head, which is given a degree of freedom in the linear movement direction with respect to the structure 6 by a linear guide 8.

A rotation guide 11 is also attached to the structure 6, giving the spindle IO a degree of freedom only in the rotational direction. The spindle 10 is connected to a drive motor 12 and a clamp mechanism (not shown) that rotates the disk, which is a disk-shaped magnetic recording medium, so that the center of the disk coincides with the spindle rotation center e. The pulse motor 1 is configured to set the relative dimension between the spindle center e and the read/write gap 9 of the magnetic head 7 to a value corresponding to a predetermined track on the disk.
By applying a driving pulse corresponding to a predetermined track number to the pulse motor 1, the rotational angular movement amount generated by the pulse motor 1 is converted into a linear movement amount via the rotational movement/M-line movement conversion device 2, and the lead of the magnetic head 7 is converted into a linear movement amount. - Move the light gap 9 relative to the spindle rotation center e.

FIG. 4 shows the configuration of a head feeding device of a conventional magnetic disk device. Reference numeral 1 designates a pulse motor, the stator of which is fixed by a bracket 15 to parts 6a and 6b of the overall structure of the magnetic disk drive. 22 is a pulse motor shaft, 23 is a pulley, 24 is a metal belt, and pulley 2
3. A rotary motion/linear motion converting mechanism is constituted by the metal belt 24, and the rotary motion/linear motion converting device 2 shown in FIG.
It corresponds to The metal belt 24 is part of the structure 6a
, 6b is connected to the head 7 guided by a linear guide 8 fixed to another part 6C of the structure made in one piece. The series of operations is the same as described with reference to FIG. This conventional example has a structure sufficient to satisfy the required performance such as average access time.

Problems to be Solved by the Invention However, the head feeding device according to the above-mentioned conventional example moves the head 7 between recording tracks on the disk 8 and when it stops, the head is not moved to the extent that read/write is possible. It takes a long time to settle down, making it difficult to shorten the so-called average access time of magnetic disk devices. This problem will be explained below. When the pulse motor 1 is energized in pulses to move the head 7 to a predetermined track and enters the stopped energized state, the relationship between the rotation angle and torque of the pulse motor 1 is as shown in Fig. 5, near its stable point. This is similar to the rotation angle displacement and torque characteristics of a torsion spring. The value obtained by converting the torsional spring constant of this torsion spring into the tension or compression spring constant of the linear motion part of the head is k, and the rotational moment of inertia around the pulse motor axis of the head feeding mechanism and the mass of the linear motion part are summarized. hand,
If the equivalent mass converted to the mass of the linearly moving part is m, then
The track movement command to the pulse motor is summarized in a simple harmonic system as shown in Fig. 6, and is equivalent to giving a constant displacement to the opposite end of the mass connection end of the spring, and at the time of starting and stopping, the mass m It has a vibration component in its motion component. In an actual system, head vibration is attenuated by the frictional resistance of the linear guide of the head, the frictional resistance between the pulse motor bearing and the shaft, the viscous frictional resistance of the air, etc., but in order to prevent read/write errors, the vibration amplitude is reduced. The start of the read/write operation must be waited until the value becomes small enough to not affect read/write operations of the head.

FIG. 7A shows the state of vibration when the head stops moving by one track in the conventional example, and FIG. 7B shows an example of the read output level waveform of the head corresponding to FIG.

In this way, when the head moves, until the vibrations subside,
It took time.

The present invention solves these conventional problems,
The purpose is to provide a magnetic disk device with shorter access time.

Means for Solving the Problems In order to achieve the above object, the present invention provides a viscous friction type damper for the linear motion part of the head feeding mechanism of a magnetic disk drive, and a weight is attached to the tip of a leaf spring to which a damping material is attached. It is composed of

Effects The present invention has the following effects due to the structure described above. That is, in the present invention, by further connecting a sub-vibration system to the main vibrator of the vibration system, if the resonance frequency of the sub-vibration system is appropriately selected, the imaging of the sub-vibrator can conversely suppress the vibration of the main vibrator, and further The viscous resistance broadens the effective resonance frequency of the sub-oscillator. Based on the well-known principle of By installing a nearly coincident sub-vibration system, when the head feeding mechanism moves the head from one track on the disk to another, it is possible to move the head from one track to another after giving the pulse motor a number of pulses corresponding to the number of tracks to be moved. , the vibration damping from the time when the pulse motor enters the fixed energization state becomes faster, and the time until read/write becomes possible after track movement is shortened, making it possible to realize a magnetic disk device with faster access time.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a pulse motor, and the stator is fixed to parts 6a and 6b of the overall structure of the magnetic disk drive by brackets 15. 22 is the pulse motor shaft,
23 is a pulley, 24 is a metal belt, and 23 and 24 are rotary motion/linear motion conversion mechanisms. metal belt 24
is part 6a of the structure.

It is connected to a head 7 guided by a linear guide 8 fixed to another part 6c of the structure made in one piece with 6b. 41 is a leaf spring, 42 is a weight, 43 is a vibration absorbing material, 44 is a means for fastening the leaf spring and the weight, 45 is a linear guide 8
This is a means for fastening the head carriage 16 and the plate spring 41 whose movement is restricted to only a straight line. The first day is a magnetic disk.

Next, the operation of the above embodiment will be explained. In the above embodiment, by giving the pulse motor 1 a drive pulse corresponding to a predetermined track number to be moved from the currently stopped track, the angular movement amount generated by the pulse motor 1 can be adjusted to The basic operation of moving the spindle 7 relative to the center of rotation of the spindle, that is, the center of the disk 18, and stopping it on a predetermined track on the disk is the same as in the conventional example. The difference from the conventional example is
The equivalent torsional spring constant near the stable point based on the torque and rotational angle characteristics of the pulse motor during fixed energization as shown in Fig. 5 is calculated using the rotational motion/linear motion conversion mechanism on the linear motion mechanism including the head carriage. The value converted into a tension or compression spring constant is k, and the equivalent mass obtained by converting the chronic load including the moment of inertia of the pulse motor rotor of the head feeding mechanism into the mass of the linear motion part is m, and the leaf spring 4 in FIG. In this implementation, the constants for the vibration in the head feed linear movement direction of the sub-vibration system caused by the weight 42 and the brake body 43 are respectively equivalent mass (md), equivalent spring constant kd, and equivalent viscosity coefficient C. The head feeding mechanism according to the example has a structure that can be expressed as a two-free vibration system as shown in FIG.

Therefore, the mechanical change to this system when the pulse motor finishes sending a predetermined amount of track movement is the same as if a motor that had been driving point A at a constant speed suddenly stopped, causing vibrations in the quality fim. has resonance characteristics, the resonance width m is suppressed, and faster vibration damping characteristics are obtained.
The time during which vibration adversely affects read/write operations of the head can be reduced. Therefore, the present invention has the advantage that the average access time of a magnetic disk device can be shortened.

Note that if a material with a large self-vibration damping effect, such as Toshiba's Silentalloy, is used as the material for the leaf spring, the damping material can be omitted.

Effects of the Invention As is clear from the above-mentioned embodiments, the present invention includes a plate spring with a weight at the tip attached to a carriage in which a magnetic head moves on a magnetic disk to perform magnetic recording and reproduction, and is attached so as to be tilted in the direction of movement of the magnetic head. With this structure, the leaf spring with a weight acts as a damper to absorb vibrations of the carriage during movement, thereby reducing access time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a head movement damper device according to an embodiment of the present invention, FIG. 2 is an equivalent model diagram of the vibration system of the same embodiment, FIG. 3 is a configuration diagram of a general magnetic disk device, and FIG. 4 is a perspective view of a conventional head moving device, FIG. 5 is a pulse motor rotation angle/torque characteristic diagram of the conventional example, FIG. 6 is an equivalent model diagram of the vibration system of the conventional example, and FIG. 7 A is a diagram of the conventional example. FIG. 7B is a characteristic diagram of the head reading output level of the conventional example. 1...Pulse motor, 6as ab, 6c...
... Part of the structure, 8 ... Linear guide, 1
5...Bracket, 16...Head carriage, 17a, 17b...Mounting screw,
18... Magnetic disk, 22... Motor shaft, 23... Pulley, 24... Metal belt, 30... Metal belt tensioner, 4
1... Leaf spring, 42... Weight, 43.
...Vibration absorbing material, 44.45...Mounting screw. Name of agent: Patent attorney Toshio Nakao and one other person Figure 7 Figure 5 Figure 6

Claims (1)

[Claims] A drive unit that rotates a magnetic disk to perform magnetic recording and reproduction; a carriage housed in the drive unit that causes a magnetic head to move over the magnetic disk to perform magnetic recording and reproduction; and a carriage mounted on the carriage in the direction of movement of the magnetic head. A head-moving damper device comprising a leaf spring with a tip weight attached so as to be tilted.