JPH0231390A - Magnetic head device - Google Patents

Abstract

PURPOSE:To prevent the oscillation due to the resonance of a magnetic head part by providing plural holes in an intermediate connection part of a gimbals supporting the magnetic head part. CONSTITUTION:A gimbals 7 is provided with an approximately U-shaped inside notch 14a and an outside notch 14b so that they face each other, and an intermediate connection part 17 to give elastic force to the gimbals 7 is formed between the inside notch 14a and the outside notch 14b. Plural holes 18 are provided on the intermediate connection part 17 of the gimbals 7 to change the inherent frequency of the gimbals 7 to a higher frequency, and the resonance point is shifted upward. Thus, head squealing is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head device used in a floppy disk drive or the like, and particularly to the structure of a gimbal that supports a magnetic head portion.

[Summary of the invention]

The present invention is a magnetic head device in which a plurality of holes are provided in an intermediate connecting portion of a gimbal that supports a magnetic head, thereby preventing vibration due to resonance of the magnetic head, which is called head noise.

[Conventional technology]

Magnetic disk drive devices that record and reproduce information signals on disk-shaped magnetic recording media such as floppy disks are easy to handle and can record large amounts of signals, so they are widely used as external storage devices for computers, word processors, etc. ing.

By the way, when recording and reproducing information signals on a magnetic disk, it is important to maintain constant contact between the recording surface of the magnetic disk and the magnetic head without spacing, and various measures have been taken to achieve this goal. .

For example, the magnetic head sections arranged on each recording surface of a magnetic disk are mounted on an elastic metal mounting plate called a gimbal, which is movable in the thickness direction, circumferential direction, or radial direction of the magnetic disk. It is attached to the support member via.

Thereby, the contact between the recording surface of the magnetic disk and the magnetic head portion can be maintained constant without any spacing, with good followability.

[Problem to be solved by the invention]

By the way, in such a magnetic head device, the magnetic head part slides in close contact with the recording surface of the magnetic disk, so when the magnetic disk is running, the magnetic head part and the recording surface of the magnetic disk are momentarily touched by friction. They stick together, and then separate when the rotational force exceeds the frictional force. That is, a phenomenon of intermittent contact in which the magnetic head sticks to and separates from the recording surface of the magnetic disk, so-called stick-slip, occurs.

In conventional magnetic head devices, the gimbal is made of a thin metal plate, so the stick-slip vibration of the magnetic head resonates with the gimbal's natural frequency, causing abnormal noise, which is called head noise. A phenomenon has occurred.

The present invention has been made in view of the above, and an object of the present invention is to provide a magnetic head device that can reliably reduce head noise with a simple configuration.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a magnetic head device in which a magnetic head section is attached to a support member via a gimbal, characterized in that a plurality of holes are provided in an intermediate connection section of the gimbal. do.

[Effect]

By providing a plurality of holes in the intermediate connecting portion of the gimbal in this way, the natural frequency of the gimbal is changed and the resonance point is shifted, thereby reducing head noise.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to FIGS. 1 to 3.

First, an embodiment in which the present invention is applied to a magnetic head device used in a double-sided floppy disk drive will be described with reference to FIG.

The magnetic head device includes a carriage portion 1 fixed to a guide bar (not shown) of a floppy disk drive main body and moved in the radial direction of the magnetic disk 5 along the guide bar by a step motor (not shown); A magnetic head portion 3 attached to the distal end side of the carriage portion l;
An arm part 2 is fixed to the carriage part 1 via a hinge part 9 and a coil spring 6 provided on the proximal end side so as to be rotatable in the direction indicated by the arrow in the figure, and an arm part 2 is attached to the distal end side of the arm part 2. The magnetic head section 4 is arranged opposite to the magnetic head section 3 with the magnetic disk 5 interposed therebetween. The magnetic head section 3 and the magnetic head section 4 mounted on the carriage section 1 and the arm section 2 perform recording and reproduction on both sides of the magnetic disk 5, respectively.

Here, as the magnetic head section 3.4, for example, the second
A tunnel erase type magnetic head section as shown in the figure is used. This figure shows the surface in contact with the recording surface of the magnetic disk, and the core 10 made of ferrite has a read/write gap 11 and on both sides of the back of the read/write gap 11. It has an erase gap 12 to ensure an interval between data during reproduction. A slider portion 13 made of ceramics or the like is laminated on the core 10 in order to ensure a sliding contact area with the recording surface of the magnetic disk.

Furthermore, in the present invention, the magnetic head section 3.4 is attached to the carriage section 1 or the arm section 2 as a support member via the gimbal 7.8, but the shape of the gimbal 7.8 is as follows. , since the shape is the same whether it is attached to the carriage part 1 or the arm part 2.
An example of the gimbal 7 when attached to the carriage part l will be described below.

The gimbal 7 used has a substantially U-shaped inner notch 14a and an outer notch 14b facing each other, as shown in FIG. In this case, an inner connecting portion 15a is provided between the inner notches 14a, and an outer connecting portion 15 is provided between the outer notches 14b.
b is left. The magnetic head section 3 is fixed to the magnetic head section mounting table 16 surrounded by the inner notch 14a by, for example, an adhesive. An intermediate connecting portion 17 that provides elastic force to the gimbal 7 is formed between the inner notch 14a and the outer notch 14b.

By adopting such a structure of the gimbal 7, the magnetic head section 3 becomes movable in the thickness direction, circumferential direction, or radial direction of the magnetic disk 5, and the magnetic head section 3 becomes movable in the thickness direction, circumferential direction, or radial direction of the magnetic disk 5. The contact with 3 has good followability and can be kept constant without spacing.

A feature of the embodiment of the present invention is that a plurality of holes 18 are provided in the intermediate connecting portion 17 of the gimbal 7. The hole 18 has a diameter of 80 to 200 μm, for example.
It is a small hole, and it is also possible to make it long and slit-like. The cross-sectional shape of the hole 18 includes, in addition to a normal through hole, a tapered hole and a concave hole that does not pass through. By providing a plurality of holes 18 in the intermediate connecting portion 17 of the gimbal 7 in this way, the natural frequency of the gimbal 7 can be changed to a higher value, and the resonance point can be shifted higher, so that head noise can be reduced. can.

In order to change the natural frequency of the gimbal 7, in addition to providing a plurality of holes 18 in the intermediate connecting portion 17 of the gimbal 7, there are two methods: reducing the thickness of the gimbal 7; There is a method of narrowing the width of the connecting portion 17. In the former method of reducing the thickness of the gimbal 7, most of the gimbals currently used for boat fishing have a thickness of 0.05m+-, and some are 0.04mm or 0.03a+m.
It is extremely difficult to obtain material with a thickness of There is also the problem that if the plate thickness is made thinner, the yield for making gimbals will be extremely low. In the latter method of narrowing the width of the intermediate connecting portion 17 of the gimbal 7,
There is a problem that bending defects are likely to occur. In addition, handling becomes especially difficult, and the yield during handling is significantly reduced. In the present invention, the intermediate connecting portion 17 of the gimbal 7
By changing the diameter and cross-sectional shape of the hole 18,
The natural frequency of the gimbal 7 can be changed continuously (when the thickness of the gimbal is changed, the natural frequency changes stepwise), and the natural frequency of the gimbal 7 can be easily adjusted to an appropriate value. A name that can go with any value.

The gimbal 7 is manufactured by etching, for example. Since gimbals have conventionally been manufactured by etching, the gimbal 7 of the present invention can be manufactured by simply changing the etching pattern without changing the conventional manufacturing process.

Further, when the gimbal 7 is coated with silicone rubber or flexible resin as a damping material to prevent head noise, the hole 18 provided in the intermediate connecting portion 17 of the gimbal 7 of the present invention is coated with silicone rubber or flexible resin. It has the function of fixing the flexible resin to prevent it from peeling off.

〔Effect of the invention〕

As is clear from the above description, the present invention relates to a magnetic head device used in a floppy disk device, etc., and in which a plurality of holes are provided in the intermediate connecting portion of the gimbal that supports the magnetic head portion, thereby making it possible to improve the unique characteristics of the gimbal. By changing the vibration frequency and shifting the resonance point, head noise is reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment in which the present invention is applied to a magnetic head device used in a double-sided floppy disk drive or the like. FIG. 2 is a schematic plan view of a tunnel erase type magnetic head section. FIG. 3 is a perspective view of the gimbal of the present invention. 1--m--・-・-・・-Carriage part 2-1
-Arm section 3.4・----・Magnetic head section 5--------・--・--Magnetic disk drive・-・・
Coil spring 7.8-----Gimbal 9--------Hinge part 10----------Core 11-------・-Read/Write gap 12-・-・--1--Erase gap 13
・−・−−−11−−−Slider part 14a Inner notch 14b・−・−−−−−1 Outer notch 15 a −
-------Inner connecting portion 15b--11----
Outer connecting portion 16 ---------------- - - - Magnetic head mounting table 17 ------- - Intermediate connecting portion 18 --- Hole Fig. 1 Tonkinre Erase Type Magnetic Tsukai, Nodo Iku's Kanada review page 2nd figure

Claims (1)

[Scope of Claim] A magnetic head device in which a magnetic head portion is attached to a support member via a gimbal, characterized in that a plurality of holes are provided in an intermediate connecting portion of the gimbal.