JPH02310819A - Head supporting device - Google Patents

Abstract

PURPOSE:To eliminate the need for assembling a shielding ring separately from a head supporting member by constituting the head supporting member in such a manner that the shielding ring is integrally formed to the head supporting member formed by sheet metals and a magnetic head is mounted to the inner side of this shielding ring. CONSTITUTION:A head carriage 21 which is the head supporting member is formed of sheets, such as iron sheets, by pressing and the shielding ring 22 is integrally formed by drawing to the upper part of the front end 21a. The magnetic head 7 is mounted by press fitting or adhering, etc., to the inner space 22a of the shielding ring 22. Plural ribs 23 for reinforcement are integrally formed to the lower part of this head carriage 21. The need for assembling the shielding ring separately from the head supporting member is eliminated in this way and, therefore, the number of parts and the man-hours for assembly are drastically reduced and the cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head support member that is most suitable for application to, for example, a head carriage or a head arm of a floppy disk device.

[Summary of the invention]

The present invention achieves the following advantages by configuring the shield ring so that it is not necessary to process and assemble it separately from the head support member.
This makes it possible to reduce the number of parts and assembly man-hours.

[Prior Art] As is well known in the art, a head support device in a floppy disk device uses a head carriage 1 and a head arm 2, which are head support members molded from synthetic resin, as shown in FIG. ing. The base 2a of the head arm 2 is attached to the upper part of the arm mount 3 integrally formed at the base of the head carriage 1 with a hinge plate 4 made of a leaf spring.
The outer circumferential portions 6a of a pair of upper and lower gimbal plates 6 made of leaf springs are fixed to the upper and lower opposing surfaces of the tips 1b and 2b of the head carriage 1 and the head arm 2 by welding or the like. , both gimbal plates 6
A pair of upper and lower magnetic heads 7 are fixed by adhesive or the like to the upper and lower opposing surfaces of the elastically supported central portion 6b, and both magnetic heads are
A pair of upper and lower shield links 8 are fixed to the outer periphery of the rad 7 with adhesive or the like, and a shield cover 9 is attached with adhesive or the like to the ends 1b and 2b of the head carriage 1 and head arm 2 on the sides opposite to the magnetic heads 7. A pair of upper and lower pivots 10, which are fixedly fixed and integrally formed on the ends 1b and 2b of the head carriage 1 and the head arm 2, support the center of the center portion 6b of both gimbal plates 6 on the side opposite to both magnetic hend doors. A plurality of terminals 12 of both magnetic heads 7 are connected to the ends of a lexical printed circuit board 11, which is a pair of upper and lower wiring materials arranged along the upper and lower opposing surfaces of the carriage 1 and the head arm 2.
The intermediate portions of both flexible printed circuit boards 11 are welded to welding dowels 16 integrally formed on the head carriage 1 and the head arm 2.

In addition, during hend loading, both magnetic heads 7 are brought into elastic contact with both upper and lower surfaces of a floppy disk 14, which is a disk-shaped recording medium set in a floppy disk device. Then, the head carriage 1 and the head arm 2
While step-feeding the floppy disk 14 integrally in a stepwise direction toward the inner diameter of the floppy disk 14, both magnetic heads 7 selectively record and/or re-travel the upper and lower surfaces of the rotationally driven floppy disk 14. At this time, both shield rings 8 and both shield covers 9 perform magnetic shielding to prevent external magnetic fields from entering both magnetic fields 7.

As shown in Figures 5A and 5B, the shield link is made of 8 magnetic materials, and the parts are small in size.
The mounting direction is also determined.

Then, when attaching the shield link 8 to the outer periphery of the magnetic head 7, after fixing the magnetic head 7 to the center part 6b of the gimbal plate 6 with adhesive or the like, a coating material was applied to the outer periphery of the magnetic head 7 for reinforcement. Before resin 1.5 hardens,
It was necessary to attach the shield link 8 by accurately fitting it into the outer periphery of the magnetic head 7 and adhering it. After the shield link 8 is attached to the outer periphery of the magnetic head 7 in this manner, it is attached to the rad arm 2 by welding or the like to the rad carriage IJP on the outer periphery 6a of the gimbal plate 6.

[Problem to be solved by the invention]

However, in the past, the shield link 8, which was made of an a-grade material and was expensive, was processed and assembled separately from the head carriage 1 and the IF head arm 2, resulting in a significant increase in cost. In addition, the shield ring 8' is small in size and has a fixed mounting direction. :Magnetic head 8
It was extremely troublesome to accurately fit and glue the outer periphery of the holder. Moreover.

After attaching the magnetic head 7 and shield link 8 to the gimbal plate 6, it is necessary to attach the gimbal plate 6 to the head carriage 1-LP head arm 2. Conventionally, the number of parts per unit and the number of assembly steps are large, which significantly increases costs. The problem was that it was expensive.

An object of the present invention is to provide a head support member that does not require processing and assembly separately from the shield ring head support member.

Means for Solving Problem C] In order to achieve the above object, the head support member of the present invention has a head support member formed of a sheet metal integrally formed with a shield ring, and a magnetic head is mounted inside the shield ring. This is the one with the .

[For production]

With the structure described above, since the shield ring is integrally formed with the head support member made of sheet metal, there is no need to process and assemble the shield ring separately from the head support member.

〔Example〕

An embodiment in which the present invention is applied to a helad carriage of a floppy disk device will be described below with reference to FIGS. 1 to 3. In addition, the same as the conventional example shown in FIGS. 4 to 5B.
Structural parts are given the same reference numerals and repeated explanations will be omitted.

The head-carriage 21, which is a head support member, is formed by pressing a plate shape such as an iron plate, and a shield link 22 is formed by drawing on the upper part of the tip 21a.
are integrally formed. The magnetic head 7 is attached within the inner space 22a of the shield link 22 by press-fitting, adhesive, or the like.

Note that a plurality of reinforcing lips 23 are integrally formed at the lower part of the head carriage 21. A flexible printed circuit board 11 is arranged between a plurality of reinforcing ribs 23 along the center of the lower part of the Herad carriage 21, and the tip 11a of the flexible printed circuit board 11 is connected to a plurality of terminals ( (including the ground terminal) 12 with a conductive adhesive, and is further fixed to the intermediate portion 11b of the lexiple printed circuit board 11 or the lower part of the herad carriage 21 by adhesive or the like. Note that the lower part of the magnetic head 7 is fixed to the lower surface of a plurality of reinforcing lips 23 by adhesive or the like at the lower part of the tip 21a of the head carriage 21.

Further, as described above, an arm 24Fa-
A lead screw engaging portion 25 is integrally formed therebetween. The lead screw engaging portion 25 is formed on the upper end of the arm 24 into a protrusion that is drawn, for example, and has a substantially V-shaped cross section.

Further, a pair of bearing mounting portions 27 are integrally formed on the side of the head carriage 21 opposite to the arm 24 via a protruding piece 26, and a pair of thrust bearings such as oil-less metal are attached to these bearing mounting portions 27. A bearing 28 is attached. Further, a spring and a mounting portion 29 are integrally formed on the side of the helad carriage 21 on the arm 24 side.

The head carriage 21 is configured as described above, and the 38th
[As shown in i9, the arm mount 30 is screwed to the upper part of the base 21b using a plurality of screws 31, and the hinge plate 4ya/
The head arm 2 is fixed with screws 5 and is biased downward by one end 32a of a torsion coil spring 32 attached to the spring attachment portion 29.

Then, as shown in FIG. 3B, a pair of thrust bearings 28 are inserted into the guide shaft 41 installed horizontally on the chassis (not shown) of the floppy disk device, and placed on the chassis in parallel with the guide shaft 41. The lead screw engaging portion 25 is engaged from below with the helical groove 43a of the lead screw 43 of the installed stepping motor 42, and the torsion coil spring 45 is attached to the spring attaching portion 44 provided on the side surface of the arm mount 30. One end 45a is pressed from above against the helical groove 43a of the IJ-toss screw 46 at the upper position of the lead screw engaging portion 25.

Then, at the time of head mead, as shown in Figure 3B,
A pair of upper and lower magnetic heads 7'a of the head carriage 21 and head arm 2 are brought into elastic contact with both upper and lower surfaces of the floppy disk 14 by a torsion coil spring 32.

Then, by stepping 9 the lead screw engaging portion 25 engaged with the helical groove 43a of the lead screw 43 rotationally driven by the stepping motor 42, the head carriage 21 and the head arm 2 are integrally moved 70 Selective recording and/or reproduction is performed by the 70-piece disc, which is driven one rotation while step-feeding in the radial direction.

At this time, the magnetic shield that prevents the external magnetic field from entering the magnetic field 7 of the head carriage 21 is formed by a shield link 22 integrally formed with the head carriage 21 made of sheet metal and a shield cover 9 fixed to the lower part. However, the entire head carriage 21 made of sheet metal also exhibits a magnetic shielding effect.

Further, since the lead screw engaging portion 25, which is fed in steps by the lead screw 43, is integrally formed with the head carriage 21 made of sheet metal, the force of the lead screw engaging portion 25 may cause backlash against the head carriage 21. , there is no risk of the head carriage 21 accidentally falling off. Therefore, reliability is extremely high! J-)" The step feed (transfer) of the head carriage 21 by the screw 43 can be performed smoothly with high precision.

Although the embodiments of the present invention have been described above, various effective modifications can be made based on the technical idea of the present invention.

In the above embodiment, a head carriage is shown as the head support member, but the present invention can be similarly applied to a head arm or the like.

Further, the present invention is applicable to head support members of various recording and reproducing devices other than the floppy disk device shown in the above embodiment.

〔Effect of the invention〕

Since the present invention is configured as described above.

This produces the following effects.

° Since the shield ring is integrally formed with the head support member made of sheet metal, there is no need to process and assemble the shield ring separately from the head support member, so the number of parts and assembly man-hours can be greatly reduced. Significant cost reduction can be achieved.

Since the shield ring is integrally formed with the head support member made of sheet metal, the magnetic head can be attached to the inside of the shield ring in one assembly process by pressing or adhesive. The number of man-hours required for attaching the head can be reduced, and the attachment of the magnetic head is also facilitated.

There is no need to process the shield ring, which is made of magnetic material and is expensive, separately from the head support member.

Since the shield ring can be omitted, component costs are also reduced.

The entire head support member made of a sheet metal also exhibits a magnetic shielding effect for the magnetic head, so together with the shield ring, it has an extremely excellent magnetic shielding effect.

[Brief explanation of drawings]

1 to 3B9 show one embodiment of the present invention, in which FIG. 1 is an enlarged sectional view of the shield ring portion, and FIG.
The figure shows the enlarged side wall thickness of the lead screw engagement part, No. 6A.
The figure is an exploded perspective view of the held carriage, and 3rd BIIW is a perspective view of the held carriage in its assembled state. FIG. 4 is a cross-sectional view of the conventional example, FIG. 5A is an exploded perspective view of many parts of the conventional example, and FIG. 5B is an assembled perspective view of the main parts of the conventional example. In addition, in the symbols used in the drawings, 7...
. . . Magnetic head 21 . . . Head carriage (head support member) 22 . . . Shield ring.

Claims (1)

[Claims] A head support member in which a shield ring is integrally formed on a head support member formed of sheet metal, and a magnetic head is attached inside the shield ring.