JPH06103585B2 - Magnetic transducer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic converter, for example, an access mechanism for a magnetic converter used for a magnetic head of a magnetic disk device, particularly a central portion in a longitudinal direction thereof. The present invention relates to a magnetic converter suitable for a device having a connecting portion with and a magnetic gear provided at the rearmost end in the longitudinal direction.

[Conventional technology]

In magnetic recording, for example, a magnetic storage medium such as a magnetic disk (hereinafter simply referred to as a magnetic medium) is placed as close as possible to a magnetic gear of the magnetic converter, while avoiding direct contact between the magnetic medium and the magnetic converter. Kaisho 49-121514
An air levitation type magnetic transducer applying an air bearing has been developed as described in Japanese Patent Laid-Open Publication No. 2003-242242.

FIGS. 2 and 3 show such a conventional magnetic converter.
It will be described with reference to the drawings.

Here, FIG. 2 is a perspective view of a conventional magnetic converter, and FIG. 3 is an explanatory view of an air flow around the conventional magnetic converter as viewed from a direction perpendicular to a magnetic medium.

The magnetic converter shown in FIG. 2 is a perspective view seen from the magnetic medium side, and the magnetic medium (not shown) approaches the magnetic converter from the lower left of the figure and leaves the upper right.

On the surface of the magnetic converter 9 facing the surface of the magnetic medium, three rail portions 1, 2, 3 extending in parallel with each other in the relative movement direction with respect to the magnetic medium are formed. These rail parts 1,
2 and 3 have taper portions 1a, 2a, 3a on the side closer to the magnetic medium, and rail surfaces 1b, 2b, 3b behind them.
To form an air sliding surface with the surface of the magnetic medium.

A magnetic gear 5 of a magnetic core 4 is provided behind the center rail portion 2. And this magnetic gear 5
Must be held accurately on a given storage track on the magnetic medium.

Normally, such a magnetic converter 9 is connected to the access mechanism by a supporting means (not shown) composed of a gimbal and a spring member, and the mounting of the supporting means and the magnetic converter 9 is performed by magnetic conversion. This is performed by a known means of bonding a gimbal to the bottom surface 6a 'of the groove portion 6'which is provided on the rear side of the container 9 in the substantially central portion in the longitudinal direction.

In an operating state in which the magnetic transducer is levitated at a minute distance from the surface of the magnetic medium, the magnetic transducer is exposed to the air flow in the relative movement direction. When the air flow around the magnetic converter at this time is viewed from the direction perpendicular to the magnetic medium surface, as shown in FIG. 3, the flows 11 and 12 separated at the front edges 7 and 8 on both side surfaces of the magnetic converter are The so-called Karman vortex streets 13 are generated in the rear, separating left and right alternately.

When such a Karman vortex street 13 occurs, as is well known, a force that changes in size and direction with time in a direction perpendicular to the air flow, that is, a fluctuating lift is applied to the magnetic transducer 9. It is a thing.

[Problems to be solved by the invention]

As described above, since the magnetic transducer 9 shown in FIG. 2 is adhered to the supporting means at the substantially central portion thereof, the above-mentioned fluctuating lift causes the rotational vibration (vibration) about the supporting means adhering portion. Dynamic movement) occurs. Further, as described above, since the magnetic gear 5 is installed at the trailing end of the magnetic converter 9, the swinging motion of the magnetic gear 5 causes the magnetic medium, for example, a magnetic disk, to be displaced from the recording track. I got it.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and is of a floating type magnetic transducer in which the fluctuation lift received from the flow of air is small and therefore the magnetic gears are less likely to be displaced. The purpose is to provide.

[Means for solving problems]

As a means for solving the above-mentioned problems, the structure of the magnetic converter according to the present invention is a magnetic converter that makes relative motion with the surface of a magnetic medium, in which the direction of relative motion is in the surface facing the surface of the magnetic medium. In a magnetic converter provided with a plurality of rail portions that are formed at intervals and have a rail surface on which an air sliding film is to be formed between the magnetic medium and the surface of the magnetic medium, from a direction in which the magnetic medium approaches the magnetic converter. The ratio of the width parallel to the magnetic medium surface to the height perpendicular to the magnetic medium surface in the projected shape of the magnetic converter when the magnetic converter is viewed is formed to be 4 or more.

Here, the concept of developing the present invention will be described with reference to FIGS. 4 to 6.

FIG. 4 is a front view of the magnetic converter of FIG. 2, FIG. 5 is a frequency distribution diagram of the variable lift, and FIG. 6 is an amplitude of the peak frequency component of the variable lift and the cross-sectional shape of the magnetic converter. It is a diagram showing the relationship of.

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

If the height perpendicular to the magnetic medium 20 and the width parallel to the magnetic medium 20 of the conventional magnetic converter 9 shown in FIG.
Is 2.8.

The present inventors measured the variable lift force acting on the magnetic transducer 9 held so as to form a minute gap with the magnetic disk of the magnetic medium 20 and analyzed the frequency, and the results shown in FIG. 5 were obtained. was gotten.

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

Then, the present inventors next measured the peak value of the variable lift using w / h as a parameter, and obtained the results shown in FIG.

Fig. 6 shows the horizontal cross-sectional shape of the magnetic transducer on the horizontal axis w / h
Is plotted on the vertical axis and the amplitude of the beak frequency component of the variable lift is indexed, and as shown in this figure, w / h
It was found that at 3.8, the amplitude was about 1/2 when w / h was small, and when w / h exceeded 4, no specific frequency fluctuation was observed.

Therefore, if w / h in the projected shape of the relative motion direction of the magnetic converter with respect to the magnetic medium is set to a value of 3.8 to 6, it is expected that the positional deviation of the magnetic gear due to the variable lift can be reduced.

[Action]

Next, FIG. 7 is an explanatory view showing the flow of air around the magnetic converter of the present invention. The flow of air when the above-mentioned w / h is 6 is a vortex that is compared with FIG. It is shown as a shape.

As shown in FIG. 7, vortex rows 14 are generated symmetrically on the left and right sides (upper and lower sides in the figure) of the flow from the front edges 7 and 8 on both side surfaces of the magnetic converter, which reduces the variable lift. It is considered to be a thing.

The reason why the symmetrical vortex streets 14 are generated is that the left and right front edges 7 and 8 of the magnetic transducer are separated from each other, and therefore the rail portion is formed.
In the wake from the flow of air through the groove formed between upstream and downstream in the relative motion direction and between the rails 2 and 3, and the air flowing over the back surface of the magnetic converter. It is considered that the mutual interference of the separation from the front edges 7 and 8 was weakened because the influence of the flow flowing into the ground was strengthened.

〔Example〕

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

FIG. 1 is a perspective view of a magnetic converter according to one embodiment of the present invention. In the figure, the same reference numerals as those in FIG.

The magnetic transducer 10 shown in FIG. 1 is formed with three rail portions 1, 2, 3 extending in parallel at intervals in the relative movement direction with respect to the magnetic medium, as in FIG. Each rail surface 1
b, 2b, 3b are provided so as to form an air sliding surface with the surface of the magnetic medium. And this magnetic converter 10
Has a thin overall shape, and the magnetic medium 20 (see FIG. 4) is moved from the direction in which the magnetic medium 20 approaches the magnetic converter 10 to the magnetic converter.
The magnetic medium with respect to the height h perpendicular to the surface of the magnetic medium 20 in the projected shape of the magnetic transducer when viewing 10.
20 The ratio of width w parallel to the surface, w / h, is formed to 4.2.

Since the overall shape is thin, the groove 6 for mounting the support means connected to the access mechanism is shallow.
Gimbals are bonded to the bottom surface 6a, and the function of the supporting portion is no different from the conventional one.

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

In an operating state in which the magnetic converter 10 floats while maintaining a minute distance from the surface of the magnetic medium 20, the magnetic converter 10 is exposed to the air flow from the relative movement direction, but in the magnetic converter 10 of the present embodiment. As described above with reference to FIG. 7, since the vortex streets 14 symmetrical to the left and right (upper and lower in FIG. 7) of the air flow are generated from the front edges 7 and 8 on both side surfaces of the magnetic transducer 10, The fluctuating lift acting on the converter 10 is suppressed to be small.

Therefore, according to the magnetic converter 10 of the present embodiment, the oscillating motion of the magnetic core 4 and the magnetic gear 5 is suppressed, and the displacement of the recording track of the magnetic medium, for example, the magnetic disk from the recording track is small. The positioning error is
The effect of reducing to 2 or less is obtained.

〔The invention's effect〕

As described above, according to the present invention, the floating type magnetic transducer which has a small fluctuation lift received from the air flow (vortex train) generated around the magnetic transducer, and thus the magnetic gear tape is less likely to be displaced. Can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic converter according to an embodiment of the present invention, FIG. 2 is a perspective view of a conventional magnetic converter, and FIG.
FIG. 4 is an explanatory view showing the flow of air around a conventional magnetic converter, FIG. 4 is a projection view of the conventional magnetic converter seen from the upstream side of the air flow, and FIG. 5 is a frequency distribution diagram of fluctuating lift. FIG. 6 is a diagram showing the relationship between the amplitude of the peak frequency component of the variable lift and the cross-sectional shape of the magnetic converter, and FIG. 7 is an explanatory diagram showing the flow of air around the magnetic converter of the present invention. . 1,2,3 …… Rail part, 1b, 2b, 3b …… Rail surface, 4 …… Magnetic core, 5 …… Magnetic gear, 10 …… Magnetic converter.

Claims (1)

[Claims] 1. A rail portion having at least both sides of a flat and substantially same rail surface that forms an air sliding film between the surface of a magnetic medium and a groove portion formed between the rail portions. In the magnetic converter, the ratio of the width w to the height h from the rail surface of the magnetic converter viewed from the upstream side of the air flow to the magnetic converter acts on the magnetic converter by the air flow. A magnetic transducer characterized by being set to a value that suppresses fluctuating lift, that is, 3.8 to 6.