JPH0246577A - Magnetic head device - Google Patents

Abstract

PURPOSE:To suppress the occurrence of a resonance phenomenon and to prevent the reduction of a recording magnetic field and the lowering of a reproducing output by layering a plural number of gimbals and fixing them to a carriage. CONSTITUTION:A 1st gimbal 2 fitted with a magnetic head 4 is layered with a 2nd gimbal 3 to be fixed on the carriage 6 via a junction part 9. In this case, when both gimbals are deformed by periodical forced power generated between the magnetic head and a rotating disk, a friction resistance is generated between the 1st gimbal 2 and 2nd gimbal 3. Consequently, by increasing the friction resistance between both gimbals according to the surface roughness and shape of the gimbal, a viscous resistance is equivalently increased, and hence the resonance can be attenuated. By this method, the reduction of the recording magnetic field and the lowering the reproducing output are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head of a magnetic head device or a magnetic head support structure.

[Prior Art] A gimbal in a magnetic head device supports a magnetic head and brings the magnetic head into smooth contact with a disk. Therefore, the gimbal is designed so that the magnetic head can easily follow the rotating disk and can move freely. Therefore, the periodic forcing force generated between the magnetic head and the rotating disk is likely to be transmitted to the gimbal, and the gimbal vibration caused thereby is likely to cause a resonance phenomenon. Conventionally, in order to suppress such resonance phenomena, we changed the vibration mode of the gimbal, which is thought to be making complex vibrations, and attenuated the resonance gain.
The resonance frequency is shifted, etc.

[Problem to be Solved by the Invention] The present invention, like the prior art, aims to provide a means for suppressing the resonance phenomenon of the gimbal, and its purpose is to provide a means for suppressing the resonance phenomenon of the gimbal. Due to the resonance of the gimbal, the spacing between the magnetic head and the disk changes in proportion to its resonance gain and at its resonance frequency, resulting in a decrease in the recording magnetic field and a decrease in playback output (space loss) at regular intervals. This is to prevent this from occurring.

[Means for Solving the Problems] A magnetic head device of the present invention mounts the magnetic head via a gimbal that holds the magnetic throat, and brings the head into contact with a disk to move the magnetic throat to a predetermined position. In a magnetic head device having a carriage that is moved to a position,
A plurality of the cymbals are stacked one on top of the other and fixed to the carriage. Moreover, such a gimbal is characterized in that a plurality of pieces are glued together with a viscoelastic body sandwiched therebetween and fixed to the gimbal.

[Example] Examples of the present invention will be described below based on the drawings. First, in the conventional example, as shown in FIG. 3, a periodic forcing force generated between the magnetic head 4 and the rotating disk is transmitted to the gimbal 8 via the magnetic head 4. If the period is such that the gimbal 8 resonates, the gimbal will resonate,
Accordingly, the magnetic head 4 resonates. The spacing between the magnetic head and the disk is proportional to its resonance gain and changes with its resonance period, resulting in a periodic decrease in the recording magnetic field and a decrease in the reproduction output (space loss). , the performance of the magnetic disk device cannot be ensured.

In order to suppress the above-mentioned resonance phenomenon, in the gimbal structure diagram of this embodiment shown in FIG. 1, a second gimbal 3 is superimposed on a first gimbal 2 to which a magnetic head 4 is fixed.
It is fixed to the carriage 6 via a joint 9. In this case, when both gimbals deform due to the periodic force generated between the 6R air head and the rotating disk, frictional resistance is generated between the first gimbal 2 and the second gimbal 3. .

Frictional resistance is generally considered to be equivalent to viscous resistance, and the maximum amplitude during resonance tends to decrease as the viscous resistance increases. Therefore, depending on the surface roughness and shape of the gimbal,
By increasing the frictional resistance between both gimbals, the viscous resistance can be increased and resonance can be damped.

As described above, the decrease in the recording magnetic field and the decrease in the reproduction output (space loss) described above do not occur periodically, and the performance of the magnetic head device can be ensured.

In addition, in the cymbal structure diagram of the embodiment shown in FIG.
This is a case where two gimbals are overlapped, but it is not necessary that the shapes of both gimbals be the same.

Now, FIG. 2 shows a gimbal structure diagram of another embodiment of the present invention. A first gimbal 2 to which a magnetic head 4 is fixed,
A second gimbal 3 is attached via the viscoelastic body 1. The outer frame of the second gimbal 3 is fixed to the carriage 6. However, it is assumed that the inner plate portion 7 of the gimbal has a structure that allows it to move freely.

The vibrations of the rotating disk are transmitted to the gimbal via the magnetic head 4 fixed to the first gimbal 2. In the case of the gimbal used in this embodiment, it is thought that vibration is mainly caused by a combination of vibration around the rotating shaft 5 and vibration in a direction perpendicular to the head surface. If the magnetic head 4 contacts the rotating disk and generates a forcing force with a period that is considered to be proportional to the rotation period, and the vibration of the gimbal mentioned above has a vibration period that resonates, the magnetic head will stop resonating. Close. The spacing between the 6R air head and the disk is proportional to its resonance gain.
Then, it changes with the resonance period, and a decrease in the recording magnetic field and a decrease in the reproduction output (space loss) occur periodically, making it impossible to ensure the performance of the magnetic disk device.

In this embodiment, since the second gimbal 3 is attached to the first gimbal 2 via the viscoelastic body 1, the viscous resistance of the gimbal vibration system becomes high.

In general, the maximum amplitude during resonance tends to decrease as the viscous resistance increases, so in this embodiment, resonance is attenuated. Note that the viscosity coefficient of the vibration system can be set based on the viscosity coefficient and shape of the viscoelastic body 1.

In addition, it is possible to change the resonance frequency of the entire vibration system depending on the elastic coefficient and mass of the viscoelastic body l, and it is possible to set the resonance frequency to be different from the frequency of the forcing force, thereby suppressing the occurrence of resonance phenomena. Can be done.

As described above, in the embodiment shown in FIG. 2 as well, the decrease in recording magnetic field and the decrease in reproduction output (space loss) do not occur periodically, and the performance of the 6n air head device can be ensured.

In addition, in the cymbal structure diagram of the example shown in Fig. 2, two gimbals of the same shape are glued together with a viscoelastic body of the same shape, but it is necessary to make the shapes of the gimbals and the viscoelastic body the same. There isn't. The same effect can also be obtained when a plurality of cymbals are glued together with a viscoelastic material sandwiched therebetween.

[Effects of the Invention] As described above, according to the present invention, it is possible to prevent a decrease in the recording magnetic field and a decrease in the reproduction output (space loss) caused by the resonance phenomenon of the gimbals by simply increasing the number of gimbals. This has the effect of ensuring the performance of the magnetic disk device. Furthermore, it is also possible to improve the yield in manufacturing magnetic disks.

[Brief explanation of the drawing]

FIGS. 1 and 2 are gimbal structure diagrams showing one embodiment of the present invention. FIG. 3 is a diagram of a conventional cymbal structure. Viscous monomer 1st gimbal 2nd gimbal Magnetic head Rotating axis Carriage Inner plate, gimbal, and joint of gimbal Applicant: Seiko Epson Corporation

Claims (2)

[Claims] (1) In a magnetic head device having a carriage that mounts the magnetic head via a gimbal that holds the magnetic head and moves the magnetic head to a predetermined position by bringing the magnetic head into contact with a disk, a plurality of the gimbals are stacked one on top of the other. A magnetic head device, characterized in that the magnetic head device is fixed to the carriage. (2) A magnetic head device characterized in that a plurality of gimbals according to item 1 are glued together with a viscoelastic material sandwiched therebetween and fixed to the gimbal.