JPH051008Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flexible magnetic disk head device that allows smooth insertion of a magnetic disk even though the magnetic head is supported by a support plate having spring properties. It is something.

A magnetic disk device, generally referred to as a floppy disk device, is constructed so that a flexible magnetic disk contained in a jacket, that is, a disk enclosure, can be inserted and removed in a plane direction that is the same as or almost parallel to the plane of rotation of the disk. There is. The head device of this disk device is constructed by fixing a resin-molded button-shaped magnetic head to a support base that can be moved in the radial direction of the disk, and the gap surface is flush with the resin mold surface. ing.
That is, the gap surface does not protrude from the resin mold surface. Therefore, there is little possibility that the magnetic head will interfere with the attachment and detachment of the disk. However, since resin molding technology is used, assembly of the head device is troublesome.

By the way, when both sides of a disk are used for recording and playback at the same time, the magnetic disk must be held between the heads on both sides without providing pads, but conventionally one magnetic head was fixedly placed. , the head did not hit the magnetic disk very well. To solve this drawback, it is desirable to support both heads with gimbal springs. However, if a gimbal-supported head is used, the head protrudes from its support and is movable, so if the disk hits the head when inserting the disk, excessive force will be applied to the head, causing damage to the head. I was afraid. For this reason, in the past, a mechanism was provided to guide the disk so that the disk would not hit the upper and lower magnetic heads, and the disk was placed on the lower head in the disk insertion bag. That is, the disk was first inserted horizontally and then moved vertically. Therefore, the structure inevitably became complicated. Furthermore, even with this configuration, there was a risk that the disk would accidentally collide with the head.

Further, in magnetic disk devices, there is a problem in that noise enters the magnetic head. Various shielding mechanisms can be considered to prevent this noise, but providing an independent shielding mechanism complicates the configuration of the magnetic disk device and increases cost.

Therefore, the purpose of the present invention is to provide a head that can bring the magnetic head into good contact with the disk, that allows smooth insertion of the disk, and that can easily and satisfactorily achieve electromagnetic or magnetic shielding. The goal is to provide equipment.

To achieve the above object, the present invention will be described with reference to the reference numerals in the drawings showing the embodiments. A magnetic head 9 which is a head device of a magnetic disk device into which a jacket 4 is inserted to perform recording or reproduction, and which is in sliding contact with the disk 3 to record or reproduce signals.
and the disk 3 while supporting the magnetic head 9.
a head support base 7 formed to move in the radial direction of the magnetic head 9 and provided with a hole 13 for allowing displacement of the magnetic head 9; The gap surface 9a for recording or reproducing the magnetic head 9 protrudes from the main surface of the head support 7. a head support plate 8 that supports the magnetic head 9 at the central portion and is formed to have spring properties so as to perform gimbal movement; An arm 7a, which has a tip that contacts the center of the surface of the head support plate 8 and serves as a fulcrum for the gimbal movement of the head support plate 8, and which is formed integrally with the head support base 7 and the gap surface of the head 9 slightly It is formed to cover the magnetic head 9 and the head support plate 8 with an opening 18 protruding from the disk 3 or the jacket 4 including the disk 3.
This relates to a head device characterized in that it has an inclined outer circumferential surface 20 for guiding the head to a predetermined position, is made of a magnetic material, and is attached to the head support 7. be.

The present invention has the following effects.

(a) Although the magnetic head 9 is gimbally supported, the cover 10 is provided, and the cover 10 is further provided with the inclined outer circumferential surface 20, so that when the disk 3 or the jacket 4 containing it is inserted, the inclined outer circumferential surface 2
0, and strong collision with the magnetic head 9 is prevented. Therefore, the disk can be inserted smoothly, and damage to the magnetic head 9 and the disk can be prevented.

(b) Since the cover 10 is made of magnetic material,
Electromagnetic or magnetic shielding can be achieved easily and well.

(c) Since it is constructed by assembling the head support stand 7, head support plate 8, magnetic head 9, and cover 10, the head device can be assembled relatively easily.

(d) Arm 7 for providing a fulcrum for gimbal movement
The provision of the head support plate 8 not only enables stable gimbal operation, but also prevents the head support plate 8 from sinking excessively along with the magnetic head 9.

Next, embodiments of the present invention will be described with reference to the drawings.

The head portion of the floppy disk device according to the embodiment of the present invention shown in FIGS. 1 to 6 is for recording or reproducing data using the floppy disk 1 shown in FIG. 7. The floppy disk 1 shown in FIG. 7 includes a flexible magnetic disk 3 having a hole 2 in the center, and a paper jacket 4 for housing the flexible magnetic disk 3.
The jacket 4 is provided with an opening 5 for bringing the magnetic head into sliding contact with the disk 3, an opening 6 for holding the magnetic disk 3 between a turntable and a clamper, and the like. The other main surface of the jacket 4 is also formed in the same pattern.

As is most obvious from FIG. 3, the head device includes a head support stand 7, a head support plate 8 having spring properties, a magnetic head 9, and a shield cover 10.
It consists of Of these, the head support stand 7 is a synthetic resin reciprocating stand generally called a carriage, and is used to send the head 9 in the radial direction of the disk 3 along the opening 5 of the jacket 4 in FIG. and is connected to the feed drive mechanism. The support base 7 is provided with a circular through hole 13 for accommodating the coil portion 11 and lead wire 12 of the head 9, and further has a ring-shaped protrusion for positioning the head support plate 8 and the shield cover 10. 27, and further includes an arm 7a for obtaining a fulcrum for gimbal-type spring support.

The head support plate 8 having spring properties is a relatively thin metal disc made of a phosphor bronze plate, and has a U-shaped notch 8a as shown in FIG. 5 to provide spring properties to the gimbal type. Further, this support plate 8 supports the magnetic head 9 at its center so that the magnetic head 9 protrudes from this surface, and the through hole 1 of the support base 7
3 is fixed to the support stand 7 so as to cover it. In this embodiment, the notch 8a is formed so that more gimbal springiness is produced in the track direction. Further, in order to obtain gimbal type springiness, the tip of the arm 7a provided on the support base 7 is located at the center of the lower surface of the support plate 8. Therefore, the support plate 8 provides gimbal-like springiness to the head 9 using the tip of the arm 7a as a fulcrum.

The magnetic head 9 holds a core 14 having a gap with a holder 15, and a coil 11 is attached to the core 14.
It is wound. Note that both ends 16 and 17 of the holder 15 in the disk radial direction are chamfered. Further, for convenience of illustration, both a recording/reproducing head and an erasing head are provided, although they are not shown separately in detail.

The shield cover 10 is made of silicon steel plate,
It has an opening 18 in its center for exposing the gap surface 9a of the head 9, and further has outer circumferential surfaces 20, 21 inclined toward the top surface 19 having the opening 18. This shield cover 10 is positioned by the outer peripheral edge of the ring-shaped protrusion 27 of the support base 7.
is fixed to. The positional relationship between the cover 10 and the head 9 is determined such that the gap surface 9a slightly protrudes from the top surface 19 of the cover, as is clear from FIGS. 2 and 3.

The head device constructed as described above is generally used as the lower head of a double-sided recording/reproducing type floppy disk device. FIG. 6 shows this state of use, in which the floppy disk 1 with the jacket 4 is inserted parallel to the gap surface 9a, and the opening 5 of the jacket 4 is used to insert the floppy disk 1 onto one side of the magnetic disk 3. Gap surface 9 of head 9
a, and the upper magnetic head 22 supported by gimbals is brought into contact with the other surface of the magnetic disk 3.
Records or plays back on both sides simultaneously. At this time, of course, the magnetic disk 3 is rotated by a disk rotating device to generate a relative scanning motion between the head 9 and the disk 3. When attaching or detaching the floppy disk 1, the arm 23 is rotated as shown by the arrow 24 in order to separate the upper magnetic head 22 from the lower head 9. A necessary gap is provided between them, and the disk 1 is moved parallel to the gap 9a as shown by an arrow 25.

The upper head 22 is attached via a gimbal spring 26 to an arm 23 that moves together with the lower support base 7. This upper head 22 is the disk 1
Since the disk 1 is sufficiently separated from the disk 1 when it is attached or detached, there is no risk of the disk 1 colliding with the disk 1. Therefore, it does not have anything equivalent to the cover 10 of the lower head 9, but a cover may be provided like the lower head 9 if necessary.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto and can be further modified. For example, the outer peripheral surface of the cover 10 may have a conical shape. Also shield cover 10
may be made of another magnetic material such as permalloy.
Further, a notch 8a may be provided in the support plate 8 to provide further spring properties. In addition, the notch 8 of the support plate 8 is arranged so that the head 9 can be displaced in both the track direction and the disk radial direction with gimbal spring properties.
You may form a. It is also applicable when the jacket 4 is not used. Furthermore, the support base 7 may be arm-shaped or block-shaped. Further, grooves may be formed in the support plate 8 so as to gimbally support the head 9 with two orthogonal rotation axes.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a head device according to the present invention;
2 is a front view of the head device shown in FIG. 1, FIG. 3 is a sectional view taken along the - line in FIG. FIG. 6 is a front view showing the head device in use, and FIG. 7 is a plan view showing the floppy disk. In the symbols used in the drawings, 1 is a floppy disk, 3 is a magnetic disk, 7 is a head support base, 7a is an arm having a fulcrum, 8 is a head support plate, 9 is a magnetic head, and 10 is a shield. The cover 18 is an opening, and 20 and 21 are inclined outer peripheral surfaces.

Claims (1)

[Claims for Utility Model Registration] A head device of a magnetic disk device that performs recording or reproduction by inserting the disk 3 or the jacket 4 containing the same from a plane direction that is the same as or almost parallel to the rotation plane of the flexible magnetic disk 3. a magnetic head 9 that is in sliding contact with the disk 3 to record or reproduce signals; and a magnetic head 9 that is formed to support the magnetic head 9 and move in the radial direction of the disk 3; a head support base 7 having a hole 13 for allowing displacement of the head; It is attached to the stand 7, supports the magnetic head 9 at the central part so that the gap surface 9a for recording or reproducing the magnetic head 9 protrudes from the main surface of the head support stand 7, and has a spring-like structure. a head support plate 8 which is formed to perform gimbal operation with a head support plate 8;
The arm 7a has a tip that serves as a fulcrum for the gimbal operation of the magnetic head and is integrally formed with the head support 7, and an opening 18 that slightly protrudes the gap surface of the head 9. 9 and the head support plate 8, has an inclined outer circumferential surface 20 for guiding the disk 3 or the jacket 4 including the same to a predetermined position, is made of a magnetic material, and is formed of a magnetic material. A head device comprising: a cover 10 attached to a head support base 7;