JPH05307713A - Magnetic head - Google Patents

Abstract

PURPOSE:To provide the magnetic head which enables the formation of the magnetic head to a small height size and the easy conduction of an operation to fix a back core. CONSTITUTION:A magnetic core 7 having a nearly U shape is mounted to a slider to be slide with a magnetic recording medium in such a manner that its gap 4 is exposed to the magnetic recording medium-sliding surface of the slider. The back core 10 is fixed to the top end of such magnetic core 7 to constitute a closed magnetic path. A coil bobbin 9 wound with a coil 8 is mounted to the above-mentioned magnetic core 7. A retaining plate 17 which consists of a spring-like material and presses and holds the above-mentioned back core 10 to the above-mentioned magnetic coil 7 is disposed atop this coil bobbin 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly to a magnetic head for recording, reproducing or erasing on a magnetic recording medium such as a floppy disk.

[0002]

2. Description of the Related Art Generally, in a floppy disk drive or the like for performing magnetic recording on a magnetic recording medium such as a floppy disk, writing data to the magnetic recording medium,
It has a magnetic head for reading or erasing.

FIG. 3 shows such a conventional magnetic head. The magnetic head 1 has a slider 2 made of a non-magnetic material which is in sliding contact with a magnetic recording medium (not shown). 2, a recording / reproducing magnetic core 5 formed in a U shape having a pair of rising portions 3 and having a gap 4 formed at the lower end portion of one rising portion 3, and an erasing magnetic core 6. A composite magnetic core unit 7 integrally formed by joining the rising portions 3 is mounted so that the gap 4 is exposed on the sliding surface of the magnetic recording medium of the slider 2.

A coil bobbin 9 around which a predetermined coil 8 is wound is mounted on the rising portion 3 of each recording / reproducing magnetic core 5 and erasing magnetic core 6 of the magnetic core unit 7. A back core 10 is provided with a clip 11 at a portion above the coil bobbin 9 of the magnetic core unit 7.
It is fixed by. Then, the magnetic core unit 7 and the back core 10 form a closed magnetic circuit. Further, a terminal holding member 12 is integrally formed on one side of the upper surface of each coil bobbin 9, and a plurality of terminals 13 connected to the coil 8 are formed on the upper surface of the terminal holding member 12 so as to project therefrom. ing.

A shield ring 14 is mounted on the outer peripheral side of the slider 2, and a gimbal plate 15 is mounted on the upper surface of the slider 2. Then, the magnetic head unit is formed by connecting the terminals 13 to a wiring pattern of a wiring board (not shown) arranged on the upper surface side of the gimbal plate 15.

In such a conventional magnetic head 1, by sliding the magnetic recording medium on the gap 4 portion of the magnetic core unit 7 of the magnetic head 1 at a predetermined speed, the magnetic recording passing through the gap 4 portion is performed. A magnetic field is applied to the medium for recording, a magnetic field generated by passing through the magnetic recording medium is taken out for reproduction, and the magnetic field of the magnetic recording medium is erased.

[0007]

However, in the conventional magnetic head, since the back core 10 is fixed to the magnetic core unit 7 by the clip 11, as shown in FIG. Since the clip 11 is interposed between the back core 10 and the back core 10, the height of the magnetic head 1 is increased by the thickness of the clip 11, and the height of the magnetic head 1 is kept constant. There is a problem in that it cannot be made smaller than the above, and it is not possible to properly cope with the recent trend toward thinner floppy disk drives. Moreover, since the clip 11 is a separate body, it is extremely difficult to fix the back core 10 having an extremely small size, and the workability is significantly reduced.

The present invention has been made in view of the above points, and provides a magnetic head in which the height of the magnetic head can be made small and the back core can be fixed easily. The purpose is that.

[0009]

In order to achieve the above-mentioned object, a magnetic head according to the present invention has a slider which slides on a magnetic recording medium and has a substantially U-shaped magnetic core whose gap has the magnetic recording of the slider. In a magnetic head, which is mounted so as to be exposed on a medium sliding surface, a back core is fixed to the upper end of the magnetic core to form a closed magnetic circuit, and a coil bobbin having a coil wound around the magnetic core is mounted. A pressing plate that is made of a spring material and that presses and holds the back core against the magnetic core is disposed on the upper surface of the coil bobbin.

[0010]

According to the present invention, after mounting the coil bobbin having the coil wound on the magnetic core mounted on the slider, the back core is provided between the pressing plate formed on the upper surface of the coil bobbin and the magnetic core. The back core is pressed against the magnetic core by press-fitting it against the pressing force of the pressing plate, and since it is not necessary to provide a clip independently, the back core is directly attached to the upper surface of the coil bobbin. The height of the magnetic head can be reduced by the thickness of the clip, and the back core can be easily mounted.

[0011]

Embodiments of the present invention will be described below with reference to FIGS.

1 and 2 show an embodiment of a magnetic head according to the present invention. A magnetic core unit 7 mounted on a slider (not shown) of the magnetic head 1 has a pair of rising portions 3. A magnetic core 5 for recording and reproduction, which is formed in a U shape and has a gap 4 formed at the lower end portion of one of the rising portions 3, and an erasing magnetic core 6 are integrally formed by joining the rising portions 3. A coil bobbin 9 around which a predetermined coil 8 is wound is mounted on the rising portion 3 of each recording / reproducing magnetic core 5 and erasing magnetic core 6 of the magnetic core unit 7. ing.

Further, in this embodiment, the coil bobbin 9 mounted on the recording / reproducing magnetic core 5 is formed to have a length dimension such that the upper surface thereof reaches the rising portion 3 of the erasing magnetic core 6. On the upper surface of the coil bobbin 9 of the recording / reproducing magnetic core 5, there is a predetermined distance from the rising portion 3 of the magnetic core unit 7 for erasing from the rising portion 3 of the recording / reproducing magnetic core 5. A holding protrusion 16 extending to a position corresponding to the rising portion 3 of the magnetic core 6 is integrally formed. Further, on one side of the upper surface of the coil bobbin 9 of the erasing magnetic core 6, a holding projection 16 is integrally formed at a position corresponding to the rising portion 3 of the erasing magnetic core 6, and each of the coil bobbins 9 is formed. A pressing plate 17 made of a spring material and having a pressing force toward the rising portion 3 of the magnetic core unit 7 is fixed to each holding projection 16.

Further, on the other side of the upper surface of each coil bobbin 9, a pressing protrusion 18 which is parallel to the holding protrusion 16 and against which the rising portion 3 of the magnetic core unit 7 abuts.
Is integrally formed, and a back core 10 is pressed against the magnetic core unit 7 by a pressing force of the pressing plate 17 at a portion above the coil bobbin 9 of the rising portion 3 of each magnetic core unit 7. Is held.

Next, the operation of this embodiment will be described.

In this embodiment, the coil bobbin 9 is attached to the rising portion 3 of each magnetic core unit 7 mounted on the slider.
After mounting each of them, by pressing the back core 10 against the pressing force of the pressing plate 17 between the rising portion 3 of the magnetic core unit 7 on the upper surface of each coil bobbin 9 and the pressing plate 17. The back core 10 is held in pressure contact with the magnetic core unit 7.

In this case, one end portion of the back core 10 of the recording / reproducing magnetic core 5 and the back core 10 of the erasing magnetic core 6 is held by the pressing plate 17 formed on the coil bobbin 9 of the recording / reproducing magnetic core 5. While pressing and holding,
The other end of the back core 10 of the erasing magnetic core 6 is pressed and held by the pressing plate 17 of the coil bobbin 9 of the erasing magnetic core 6, and the back core 10 is raised by the rising portion 3 of the magnetic core unit 7. When they are pressed into contact with each other, the back surface of the rising portion 3 of the magnetic core unit 7 is held by the pressing projection 18 formed on the coil bobbin 9.

Therefore, in this embodiment, the back core 10 is press-fitted between the rising portion 3 of the magnetic core unit 7 and the pressing plate 17 on the upper surface of each coil bobbin 9 to independently provide a clip. Instead, the back core 10 is held in pressure contact with the magnetic core unit 7, so that the back core 10 can be directly arranged on the upper surface of the coil bobbin 9, whereby the height dimension corresponding to the thickness dimension of the clip can be reduced. The height of the magnetic head 1 can be reduced and the floppy disk drive can be properly thinned. Moreover, by pressing the back core 10 into the pressing plate 17 without using the clip, the back core 1
Since 0 is attached, the work of fixing the back core 10 can be easily performed, and the workability can be significantly improved.

The present invention is not limited to the above embodiment, but various modifications can be made as necessary.

[0020]

As described above, in the magnetic head according to the present invention, by pressing the back core between the pressing plate of the coil bobbin and the magnetic core, the back core is magnetized without providing a clip independently. The back core can be placed directly on the upper surface of the coil bobbin because it is held in pressure contact with the core, which can reduce the height by the thickness of the clip and the height of the magnetic head. Can be formed small, and it is possible to appropriately cope with the thinning of the floppy disk drive.
Moreover, since the back core is mounted by pressing the back core into the pressing plate portion without using a clip, the work of fixing the back core can be easily performed, and the workability can be significantly improved. And other effects.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an embodiment of a magnetic head according to the present invention.

FIG. 2 is a vertical sectional view of FIG.

FIG. 3 is an exploded perspective view showing a conventional magnetic head.

FIG. 4 is a front sectional view of FIG.

5 is a side sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 magnetic head 3 start-up part 4 gap 5 recording / reproducing magnetic core 6 erasing magnetic core 7 magnetic core unit 8 coil 9 coil bobbin 10 back core 16 holding protrusion 17 pressing plate 18 pressing protrusion

Claims (1)

[Claims] 1. A slider that slides on a magnetic recording medium is mounted with a magnetic core having a substantially U-shape so that the gap is exposed on the sliding surface of the magnetic recording medium of the slider, and the upper end of the magnetic core is mounted. In a magnetic head having a back core fixed to a closed magnetic path and having a coil bobbin having a coil wound around the magnetic core, the back core made of a spring material is attached to the upper surface of the coil bobbin. A magnetic head having a pressing plate for pressing and holding the magnetic head.