JPH05282625A - Magnetic head device for flexible disk - Google Patents

Abstract

PURPOSE:To provide the magnetic head device for a flexible disk which can deal sufficiently with the miniaturization of the disk. CONSTITUTION:A groove part 44b is formed on near one side edge 44a on the inner peripheral side of a head body 3 constituted by embedding magnetic cores 15, 17 for recording and reproducing and magnetic cores 16, 18 for erasing in guard materials 43, 44. One end 51b of a shielding material 51 is detained and disposed in this groove part 44b. As a result, the shielding material 51 is mounted and positioned by retreating the material by a prescribed distance x0 from one side edge 44a on the inner peripheral side of the flexible disk of the head body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device for a flexible disk suitable for writing or reading an information signal on, for example, a floppy disk.

[0002]

2. Description of the Related Art Conventionally, as a magnetic head device for a floppy disk, one having a structure as shown in FIG. 4, for example, has been proposed. In this magnetic head device 106, a back core is superposed in a pair of coil bobbins in which a driving coil is wound around a front core having a recording / reproducing magnetic gap g ₁ and an erasing magnetic gap g _2, and a magnetic circuit portion is constructed. The head element 101 has a pair of sliders 10 for ensuring contact characteristics with a floppy disk.
The head main body 104 is sandwiched between the second main body 104 and the second main body 104, and the shield member 105 is provided so as to cover the outer periphery of the head main body 104. The shield material 105 is a frame body made of a high magnetic permeability material, and is provided to prevent leakage flux from the outside from entering the magnetic gaps g ₁ and g ₂ .

The magnetic head device 106 thus constructed is attached to a head supporting member 108 mounted on a floppy disk drive device via a gimbal 107, as shown in FIG. 5, for example. The pair of head main bodies 104a and 104b are arranged so as to face each other with the floppy disk 111 rotatably housed in the cartridge 110 interposed therebetween, and the recording / reproducing opening 110a formed in the cartridge 110. Information signals are recorded / reproduced on both sides of the floppy disk 111 which is exposed further.

In such a floppy disk drive device, the magnetic head device 106 is rotated along with the rotation operation of the floppy disk 111 at the time of recording / reproducing.
Is moved in the radial direction (X direction in the drawing) of the floppy disk 111, so that recording and reproduction are performed over the entire data area on the floppy disk 111.

[0005]

However, in the magnetic head device 106, the shield material 105 is provided so as to cover the outer periphery of the head main body 104, and a metal material is used for the position regulation. In some cases, squeezing is applied or it is generally unregulated. Therefore, in the magnetic head device 106, in addition to the thickness of the shield material 105,
Since the shield member 105 is loosely fitted, it becomes bulkier than the size of the head body 104 itself.

Therefore, when the size of the disk is reduced, the magnetic head device is contacted by the contact between the spindle motor 112 for rotating the floppy disk 111 and the inner peripheral side surface 105a of the shield member 105. The movable range of 106 is restricted, which is a great shackle for securing the data capacity of the floppy disk 111.

Therefore, the present invention has been proposed in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a magnetic head device for a flexible disk capable of sufficiently coping with miniaturization of the disk.

[0008]

The magnetic head device for a flexible disk according to the present invention has been proposed to achieve the above object. That is, the present invention comprises a head body in which a recording / reproducing magnetic core and an erasing magnetic core are embedded in a guard material, and a shield material fitted around the head body. A groove is formed in the vicinity of one edge on the inner circumference side of the disk, and the shield material is positioned and locked in the groove, and the shield material is retracted from one edge on the inner circumference side of the flexible disk of the head body. It is characterized by that.

[0009]

The groove portion is formed in the vicinity of one side edge on the inner peripheral side of the flexible disk disposed so as to face the sliding surface of the head body, and the shield member is locked in the groove portion and disposed. The shield material is attached at a predetermined position without being displaced with respect to the head body.

At the same time, normally, the shield material is arranged so as to cover the outer periphery of the head body, whereas in the present invention, at least the shield material closer to the inner peripheral side of the flexible disk is used. Since one side surface is provided so as to recede from the one side edge on the inner circumference side of the flexible disk of the head body, the position where one side surface of the shield material and the spindle motor that allows the flexible disk to rotate contacts the inner circumference portion by that amount. Will be moved to the side. Therefore, the head body is scanned toward the inner circumference side of the flexible disk, so that the data area can be enlarged.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings. In this example,
1 is an example of a magnetic head device for a floppy disk that records and reproduces an information signal on a floppy disk.

As shown in FIGS. 1 and 2, this magnetic head device includes a head body 3 composed of a recording / reproducing head and an erasing head, and a shield material 51 fitted to the head body 3. It consists of The head main body 3 mainly includes a front core 10 and a back core 11 which are magnetic cores that form a closed magnetic path via a magnetic gap.
And a pair of coil bobbins 12 and 13 around which drive coils are fitted and arranged on the front core 10 and the back core 11.

The front core 10 is provided with a pair of rod-shaped center core portions 15 and 16 joined together via a non-magnetic material 14 so as not to magnetically interfere with each other. , 18 are butted, and the butted surfaces have a first magnetic gap and a second magnetic gap (both are not shown).
The first magnetic gap operates as a recording / reproducing magnetic gap, and the second magnetic gap operates as an erasing magnetic gap.

On the other hand, the back core 11 is composed of a pair of core members 19 and 20 formed in correspondence with the core shape of the front core 10 and joined at the side surface side with a non-magnetic material 55 interposed therebetween. ing. The core members 19 and 20
Is the center core portions 15 and 16 of the front core 10.
Also, center leg portions 21 and 22 and side leg portions 23 and 24 are provided at positions facing the side core portions 17 and 18, respectively, and are connected by connecting members 25 and 26 to have a substantially U-shaped planar shape. Therefore, the center leg portions 21 and 22 are
By providing the side legs 23 and 24 with each other, it is possible to secure a joint area between the cores that increases the length of the front core 10 in the depth direction, and improve the electromagnetic conversion characteristics.

The coil bobbins 12 and 13 are formed by insert-molding the external terminals 27 and 28 formed by stamping a hoop material.
A body portion around which the body portion 9 and 30 are wound, and a pair of upper and lower flange portions 31, 32, 33, and 34 that regulate the winding position of the drive coils 29 and 30 wound around the body portion in the height direction are provided. I will do it. A predetermined number of pairs of drive coils 29 are wound around the coil bobbin 12 through which the side core portion 17 of the front core 10 on the side where the magnetic gap for erasing is formed is inserted, and the winding start and winding end are wound around the external terminals 27, respectively. Has been. On the other hand, two drive coils 30 are wound around the coil bobbin 13 through which the side core portion 18 of the front core 10 on the side where the magnetic gap for recording and reproduction is formed is inserted, and the start and end of the winding and the common portion. (Common) is wound around each of the three external terminals 28.

On the other hand, when the magnetic head device is mounted on the floppy disk drive device, the coil bobbin 12 is attached to the flange portions 31 and 33 attached to the movable arm constituting the head supporting member of the floppy disk drive device body. , 13 for supporting the external terminals 27, 28 along one side edge on the side opposite to the facing surfaces of the terminals 13, 13,
6 is provided as a thick protrusion. External terminals 27 and 28 are set up on the terminal support portions 35 and 36 at predetermined intervals. Further, the flange portions 31 and 33 are located at positions facing the protrusions for maintaining a stable contact state with a disk called a pivot provided on the movable arm, that is, in the present example, the coil bobbins 12 and 13. Receiving portions 37 and 38 for the protrusions are provided at the corners of one side edge on the opposite side. The receiving portions 37 and 38 are provided as projections having a rectangular shape in a plane so as to project toward the movable arm, and the flat surfaces thereof receive an impact concentrated on the projection portions during a catching operation. In particular, the receiving portions 37 and 38 are continuous with the flange portions 31 and 33 to a thin portion so that the vibrations from the protruding portions are not transmitted to the external terminals 27 and 28. For example, the wall thickness is 0.15 mm
It is a degree.

The front core 10 and the back core 11 are arranged such that the side core portions 17 and 18 of the front core 10 and the side leg portions 23 of the back core 11 are formed in the through holes 12a and 13a provided in the coil bobbins 12 and 13, respectively. Two
4 and 4 come into contact with each other and are superposed in a so-called stacked state.
That is, one side surface 17a of the side core portion 17 and the side leg portion 2
3 is in contact with one side surface 23a of the side core portion 18 for magnetic coupling, and one side surface 18a of the side core portion 18 is in contact with one side surface 24a of the side leg portion 24 for magnetic coupling to form a closed magnetic path. To be done. Therefore, the front core 10, the back core 11, and the coil bobbins 12 and 13 operate as a magnetic head element having a first magnetic gap that operates as a recording / reproducing magnetic gap, that is, a recording / reproducing head and an erasing magnetic gap. A magnetic head element having a second magnetic gap, that is, an erasing head is configured.

A core pressing member 39 for magnetically coupling the front core 10 and the back core 11 is inserted into the through holes 12a and 13a of the coil bobbins 12 and 13, respectively. The core pressing member 39 is
The front core 10 is composed of a thin metal leaf spring.
The core holding pieces 40 and 41 to be inserted into the coil bobbins 12 and 13 together with the side core portions 17 and 18 and the side leg portions 23 and 24 of the back core 11 and the connecting member 42 for connecting these. .. The core pressing piece 4
0 and 41 are provided so as to hang down in the direction of the front core 10 from both ends in the longitudinal direction of the connecting member 42, and are integrally provided on the connecting member 42. The tip ends of the core pressing pieces 40 and 41 are bent in a dogleg shape, and the back core 11 is pressed against the front core 10 by the elastic force of the bent portions 40a and 41a. ..

The core pressing member 3 formed as described above
Reference numeral 9 denotes through holes 12a and 13a of the coil bobbins 12 and 13.
In the inside, the tips of the core pressing pieces 40, 41 are the through holes 12
While contacting the inner walls of a and 13a, the bent portions 40a and 41a contact the back core 11, and a part of the connecting member 42 contacts the outer peripheral edges of the through holes 12a and 13a and bends, and The leg portions 23, 24 are pressed and supported by the side core portions 17, 18 of the front core 10. As a result, the side core portions 17 and 18 and the side leg portions 23 and 2
4 are pressed and supported, and the magnetic and mechanical coupling between the side core portions 17 and 18 and the side leg portions 23 and 24 is ensured. Therefore, no gap is formed between the front core 10 and the back core 11, and the gap does not operate as a back gap when the magnetic head is driven.

In the head body 3 as described above, a pair of sliders 43 and 44 are attached as guard members on the side where the recording / reproducing magnetic gap and the erasing magnetic gap are provided to ensure contact characteristics with the floppy disk. Has been done. The pair of sliders 43, 44
One of the sliders 43 is provided in the center core portions 15 and 16 and the side core portions 17 and 18 of the front core 10.
And core reinforcing leg portions 45, 46 and 47 which contact the respective core portions and reinforce the mechanical strength of these core portions. In addition,
The core reinforcing leg portions 45, 46, 47 are inserted into the coil bobbins 12, 13 together with the side core portions 17, 18.

On the other hand, the other slider 44 has joining leg portions 48 and 49 for joining the center core portions 15 and 16 of the front core 10 and the side core portions 17 and 18 to the gimbal at positions corresponding to the respective side core portions 17 and 18. , 50. These joint legs 48, 49, 50 are attached to the slider 4
4 is provided so as to recede inward from the inner peripheral side one side edge 44a.

Further, the slider 44 is formed with a groove portion 44b extending along one inner peripheral side edge 44a thereof. The groove portion 44b is formed between the inner peripheral side one side edge 44a and the joint leg portions 48, 49, 50 at a position where the distance from the inner peripheral side one side edge 44a is x _0. One end portion 5 of the shield material 51 is provided in the groove portion 44b as described later.
1b is locked.

Therefore, the width of the groove portion 44b needs to be at least the thickness of the shield material 51 or more, and is preferably about the thickness of the shield material 51 +50 μm. The width of the groove 44b is 50μ
If it is more than m, fitting backlash occurs and good position regulation cannot be performed.

The head body 3 sandwiched by the sliders 43, 44 is provided with a frame-shaped shield member 51 having a rectangular shape in plan view. The head body 3 and the shield member 51 form a magnetic head. The device is configured. The shield material 51 is provided in order to prevent leakage flux from the outside from entering the first magnetic gap and the second magnetic gap,
It is made of permalloy, ferrite or the like having high magnetic permeability. The thickness of the shield material 51 is preferably about 0.2 mm when permalloy is used as the constituent material and about 0.5 mm when ferrite permalloy is used. If the thickness of the shield material 51 is smaller than the above range, the function as the shield material cannot be sufficiently exerted and the mechanical strength is deteriorated. On the other hand, if the thickness is too large, the outer shape of the magnetic head device becomes large, which is disadvantageous in terms of size reduction.

At this time, the joining leg portion 4 of the slider 44 is
8, 49 and 50 are the inner peripheral side edges 44 of the slider 44.
The joint leg 4 is provided so as to be retracted from a.
8, 49, 50 and one side edge 44a on the inner peripheral side of the slider 44
Since the groove portion 44b is formed between the slider member 51 and one end, the one end portion 51b of the shield member 51 is locked in the groove portion 44b, and is retracted by a distance x ₀ from the inner peripheral side one side edge 44a of the slider 44. Mounted in position.

In the magnetic head device having such a structure, as shown in FIG. 3, the head body 3 slides on the side where the first magnetic gap g ₁ and the second magnetic gap g ₂ are formed. A recording / reproducing head composed of a side core portion 17 and a center core portion 15 that form a closed magnetic path through the _first magnetic gap g ₁ with respect to the floppy disk that is disposed as a surface and faces the sliding surface. Recording / reproducing or erasing is performed by the erasing head composed of the side core portion 18 and the center core portion 16 forming a closed magnetic circuit via the second magnetic gap g ₂ .

In this magnetic head device,
As described above, since the one end portion 51b of the shield material 51 is locked and positioned in the groove portion 44b, the inner peripheral side surface 51a of the shield material 51 closer to the inner peripheral side of the floppy disk is , Is provided so as to be retracted by a distance x ₀ from one side surface of the head main body 3, that is, one inner peripheral side edge 44a of the slider 44 without causing looseness.

Therefore, when such a magnetic head device is attached to a carriage which is a head supporting member of a floppy disk drive main body through a gimbal and the magnetic head device is moved in the radial direction of the floppy disk by this carriage, The movable range of the magnetic head device is such that the spindle motor for rotationally driving the floppy disk does not come into contact with the inner peripheral side surface 51a of the shield member 51.

However, since the one side surface 51a on the inner peripheral side of the shield material 51 is provided so as to be retracted, the head main body 3 is correspondingly scanned to the inner peripheral side of the shield material 51. Become. Therefore, this head body 3
Without changing the shape of the sliding surface of the shield material 51
By reducing only the outer shape of the head main body 3
It is possible to expand the range of movement of the disk and expand the data area on the floppy disk to the inner peripheral side. Therefore, even if the size of the disk is reduced, a sufficient data capacity can be secured.

[0030]

As is apparent from the above description, according to the present invention, the flexible disk disposed opposite to the sliding surface of the head body is located near one side edge of the flexible disk near the inner peripheral side. Since the groove portion is formed and the shield member is fitted and disposed so as to be locked in the groove portion, the shield material can be attached to the head main body without causing looseness by fitting. Therefore, since the position of the shield material is easily regulated, manufacturing control becomes easy.

Further, since one side surface on the inner peripheral side of the shield member is provided receding from the side surface of the head main body on the same side as this one side surface, the magnetic head can be formed without changing the shape of the sliding surface of the head main body. The outer shape of the device can be reduced.
Therefore, when the magnetic head device is moved in the radial direction of the flexible disk at the time of recording / reproducing, the restriction of the moving range of the magnetic head device due to contact with the spindle motor for rotating the flexible disk is alleviated. It is possible to scan the head body toward the inner circumference side of the flexible disk. Therefore, even when the size of the disk is reduced, it is possible to effectively perform recording / reproducing on the disk surface by expanding the moving range of the magnetic head device as described above, and secure a sufficient data capacity. be able to.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of an example of a magnetic head device to which the present invention is applied.

FIG. 2 is a perspective view of the assembled magnetic head device.

FIG. 3 is a perspective view seen from the sliding surface side of the head body of the magnetic head device to which the present invention is applied.

FIG. 4 is a perspective view seen from a sliding surface side of a head body of a conventional magnetic head device.

FIG. 5 is a sectional view showing a state in which recording / reproduction is performed on a floppy disk by a conventional magnetic head device.

[Explanation of symbols]

 3, 4 ... Head body 5 ... Floppy disk 10 ... Front core 11 ... Back core 12, 13 ... Coil bobbin 43, 44 ... Slider

Claims (1)

[Claims] 1. A flexible disk of the head body, comprising a head body having a recording / reproducing magnetic core and an erasing magnetic core embedded in a guard material, and a shield material fitted around the head body. A groove is formed in the vicinity of the inner peripheral side one side edge, the shield material is locked and positioned in the groove part, and the shield material is retracted from the flexible disk inner peripheral side one side edge of the head body. A magnetic head device for a flexible disk, characterized by: