JPS62183020A - Magnetic transducer - Google Patents

Abstract

PURPOSE:To make the occurrence of position deviation of a magnetic gap difficult by forming a ratio of a width in parallel with the magnetic medium surface to a height perpendicular to the magnetic medium surface in a projected shape of a magnetic transducer to be >=4. CONSTITUTION:Three rails 1, 2, 3 prolonged in parallel are formed to the magnetic transducer 10 at an interval in the relative moving direction from the magnetic medium and provided with rail faces 1b, 2b, 3b to form an air sliding face with the magnetic medium surface. The profile of the magnetic transducer 10 is made thin and the width (w) in parallel with the surface of the magnetic medium 20 to the height (h) perpendicular to the surface of the magnetic medium 20 in the projected shape of the magnetic transducer viewing the magnetic transducer 10 from a direction where the magnetic medium 20 approaches the magnetic transducer 10 is formed to be 4 or over. Since the profile is made thin, although a slot 6 fitting a support means provided side by side to the access mechanism is shallow, a gimbal is adhered to a bottom face 6a and the function of a support does not differ from that of a conventional system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic transducer, and particularly relates to a magnetic transducer used in a magnetic head of a magnetic disk device, etc., in which an access mechanism is provided in the longitudinal center of the transducer. The present invention relates to a magnetic transducer suitable for a magnetic transducer having a connecting portion with a magnetic transducer and a magnetic gap provided at the rearmost end in the longitudinal direction.

[Conventional technology]

In magnetic recording, 1. For example, in order to make the magnetic gap of a magnetic transducer as close as possible to a magnetic storage medium (hereinafter simply referred to as a magnetic medium) such as a magnetic disk, and to avoid direct contact between the magnetic medium and the magnetic transducer, Japanese Unexamined Patent Publication No. 49-12
An air levitation type magnetic transducer using an air bearing as described in Japanese Patent No. 1514 has been developed.

2 and 3 for such conventional magnetic transducers.
This will be explained with reference to the figures.

FIG. 2 is a perspective view of a conventional magnetic transducer.

FIG. 3 is an explanatory diagram of the air flow around a conventional magnetic transducer viewed from a direction perpendicular to the magnetic medium.

The magnetic transducer shown in FIG. 2 is a perspective view seen from the magnetic medium side, with the magnetic medium (not shown) approaching the magnetic transducer from the bottom left of the figure and leaving the top right.

On the surface of the magnetic transducer 9 facing the surface of the magnetic medium, three rail portions 1, 2.3 are formed that extend parallel to each other at intervals in the direction of relative movement with the magnetic medium. Each of these rail parts 1, 2.3 has a tapered part 1a+2a, 3a, respectively, on the side closer to the magnetic medium, and a rail surface [b] behind them.

2b and 3b to form an air sliding surface with the surface of the magnetic medium.

A magnetic core 4 and a magnetic gap 5 are provided behind the central rail portion 2. This magnetic gap 5 must be maintained precisely on a predetermined storage track on the magnetic medium.

Normally, such a magnetic transducer 9 is connected to the access mechanism by a support means (not shown) consisting of a gimbal and a spring member, and the attachment of the support means and the magnetic transducer 9 is done by This is accomplished by a known method of bonding a gimbal to the bottom surface 6a' of a groove 6' provided at approximately the center in the longitudinal direction on the rear side.

In the operating state in which the magnetic transducer floats at a small distance from the surface of the magnetic medium, the magnetic transducer is exposed to air flow from the direction of relative motion. If we look at the air flow around the magnetic transducer at this time from the direction perpendicular to the surface of the magnetic medium, we can see that the flow separates at the front edges 7 and 8 on both sides of the magnetic transducer, as shown in Figure 3.゜12 peels off alternately on the left and right, backwards,
A so-called Karman vortex street 13 is generated.

When such a Karman vortex street 13 occurs.

As is well known, a force whose magnitude and direction change over time in a direction perpendicular to the air flow, that is, a lift force is applied to the magnetic transducer 9.

[Problem that the invention seeks to solve]

As mentioned above, since the magnetic transducer 9 shown in FIG. 2 is bonded to the support means at approximately the center thereof, the above-mentioned fluctuating lift causes rotational vibration (oscillating motion) centered on the bonded portion of the support means. ) occurs. Furthermore, as described above, since the magnetic gap 5 is installed at the downstream end of the magnetic transducer 9, there is a problem in that its oscillating motion causes a positional shift from the recording track of the magnetic medium, for example, a magnetic disk. Ta.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and aims to provide a floating magnetic transducer that receives little fluctuating lift from airflow and is therefore less likely to cause misalignment of the magnetic gap. , that purpose.

[Means for solving problems]

As a means for solving the above-mentioned problems, the configuration of a magnetic transducer according to the present invention is a magnetic transducer that moves relative to the surface of a magnetic medium, and has a magnetic transducer that moves relative to the surface of the magnetic medium in the direction of the relative movement. In the magnetic transducer, the magnetic transducer includes a plurality of rail portions that are formed at intervals and have rail surfaces that form an air sliding film between the magnetic medium and the magnetic medium surface. In the projected shape of the magnetic transducer when looking at the magnetic transducer from the direction, the ratio of the width parallel to the magnetic medium surface to the height perpendicular to the magnetic medium surface is 4 or more. .

The concept behind the development of the present invention will now be explained with reference to FIGS. 4 to 6.

Figure 4 is a front view of the magnetic transducer shown in Figure 2, Figure 5 is a frequency distribution diagram of fluctuating lift, and Figure 6 shows the amplitude of the peak frequency component of fluctuating lift and the cross-sectional shape of the magnetic transducer. FIG.

FIG. 4 is a front view of the conventional magnetic transducer 9 seen from the upstream side of the air flow. In other words, when looking at the magnetic transducer 9 from the direction in which the magnetic medium approaches the magnetic transducer 9 This corresponds to a diagram showing the projected shape of the magnetic transducer.

If the height perpendicular to the magnetic medium 20 of the conventional magnetic transducer 9 shown in FIG. 4 is h, and the width parallel to the magnetic medium 20 is W, then
w/h is 2.8.

The present inventors measured the fluctuating lift force acting on the magnetic transducer 9 held at a minute distance from the magnetic disk related to the magnetic medium 20, and analyzed its frequency, and found the results shown in FIG. was gotten.

FIG. 5 shows the frequency on the horizontal axis and the variable lift force on the vertical axis. As is clear from this figure, it was found that the variable lift force fluctuates at a specific frequency. This is related to the generation of the Karman vortex street shown in FIG.

Therefore, the inventors next measured the peak value of the fluctuating lift using w/h as a parameter, and obtained the results shown in FIG. 6.

In Figure 6, the horizontal axis represents the cross-sectional shape of the magnetic transducer w/
h, and the amplitude of the peak frequency component of the fluctuating lift is plotted as an index on the vertical axis.

As shown in this figure, when w/h is 3.8, the amplitude is approximately 1/2 of that when w/h is small, and when w/h exceeds 4, fluctuations in specific frequencies are no longer observed. Ta.

Therefore, if w/h in the projected shape of the relative motion direction made by the magnetic transducer with the magnetic medium is set to 4 or more, it is possible to reduce the positional deviation of the magnetic gap due to the fluctuating lift force.

[Effect]

Next, FIG. 7 is an explanatory diagram showing the air flow around the magnetic transducer of the present invention. It is shown as a shape.

As shown in FIG. 7, the front edges 7, 8 on both sides of the magnetic transducer
Therefore, a vortex row 14 that is symmetrical on the left and right sides of the flow (up and down in the figure) is generated, and it is thought that this causes the fluctuating lift force to become small.

The reason why the left-right symmetrical vortex row 14 is generated is that the left and right front edges 7 and 8 of the magnetic transducer are spaced apart, and because of this, there is a relative movement between the rail parts 1 and 2 and between the rail parts 2 and 3. Due to the air flow through the groove formed in the direction from upstream to downstream and the air flow over the back side of the magnetic transducer, the influence of the flow flowing into the wake is strengthened, so that both leading edges 7
This is thought to be due to the weakening of the mutual interference of peeling from , 8.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a perspective view of a magnetic transducer according to an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 are the same parts as in the conventional example, and therefore the explanation thereof will be omitted.

The magnetic transducer 10 shown in FIG. 1, as in FIG.
Book rail portions 1, 2.3 are formed, each having a rail surface 1b, 2b, 3b so as to form an air sliding surface with the magnetic medium surface. The magnetic transducer 10 has a thin overall shape, and the magnetic transducer 10 when viewed from the direction in which the magnetic medium 20 (see FIG. 4) approaches the magnetic transducer 10 In the projected shape of the container, the ratio of the width W parallel to the surface of the magnetic medium 20 to the height h perpendicular to the surface of the magnetic medium 20, w
/h is set to 4.2.

Since the overall shape is thin, the groove 6 is shallow for attaching the support means connected to the access mechanism.
A gimbal is bonded to the bottom surface 6a, and the function of the support section is no different from the conventional one.

Therefore, the magnetic core 4 and the magnetic gap 5 provided at the rear of the central rail portion 2 are accurately held on the storage track of the magnetic medium 20, for example, a magnetic disk.

The magnetic transducer 10 is placed at a small distance from the surface of the magnetic medium 20.
In the operating state in which the magnetic transducer 10 floats, the magnetic transducer 10 is exposed to air flow from the direction of relative motion. Since vortex rows 14 are generated from the front edges 7 and 8 on both side surfaces of the magnetic transducer 10, which are symmetrical in the left and right directions (up and down in FIG. 7) of the air flow, the fluctuating lift acting on the magnetic transducer 10 is suppressed to a small level.

Therefore, according to the magnetic transducer 10 of this embodiment, the swinging motion of the magnetic core 4 and the magnetic gap 5 is suppressed, and the positional deviation of the recording track of the magnetic medium, for example, a magnetic disk, from the recording track is reduced. The effect of reducing the positioning error to 1/2 J'J of that of the conventional method can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, changes caused by air flow can be reduced. l! It is possible to provide a floating magnetic transducer that has a small lJ lift force and is therefore less likely to cause misalignment of the magnetic gap.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a magnetic transducer according to an embodiment of the present invention, Fig. 2 is a perspective view of a conventional magnetic transducer, and Fig. 3 shows the air flow around the conventional magnetic transducer. Explanatory diagram showing, No. 4
The figure shows a projection of a conventional magnetic transducer viewed from the upstream side of the air flow, Figure 5 is a frequency distribution diagram of fluctuating lift, and Figure 6 shows the amplitude of the peak frequency component of fluctuating lift and the magnetic transducer. FIG. 7, a diagram showing the relationship with the cross-sectional shape, is an explanatory diagram showing the flow of air around the magnetic transducer of the present invention. 1.2.3...Rail part, lb, 2b, 3b...Rail surface, 4...Magnetic core, 5...Magnetic gap, 1
0...Magnetic transducer.

Claims (1)

[Claims] 1. A magnetic transducer that moves relative to the surface of a magnetic medium, which is formed on a surface facing the surface of the magnetic medium at intervals in the direction of relative movement, and forms an air sliding film between it and the surface of the magnetic medium. In a magnetic transducer equipped with a plurality of rail parts having a symmetrical rail surface, the surface of the magnetic medium in the projected shape of the magnetic transducer when the magnetic transducer is viewed from a direction in which the magnetic medium approaches the magnetic transducer. A magnetic transducer characterized in that the ratio of the width parallel to the surface of the magnetic medium to the height perpendicular to the magnetic medium is 4 or more.