JPH0643892Y2 - Head support member - Google Patents

Description

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

[Outline of device]

According to the present invention, a gimbal plate for supporting a main body of a support member and a magnetic head is integrally formed by a leaf spring, and a head cover formed by a sheet metal is superposed and fixed on the main body of the support member to form a head support member. With this structure, the head support member can be easily manufactured and the magnetic shield effect of the magnetic head can be enhanced.

[Conventional technology]

As is well known in the art, as shown in FIG. 4, a head carrier 1 and a head arm 2 which are head supporting members made of synthetic resin are used for the head supporting device in the floppy disk device. Then, the base 2a of the head arm 2 is screwed to the upper part of the arm mount 3 integrally formed with the base of the head carriage 1 with a plurality of screws 5 via a hinge plate 4 composed of a leaf spring, and the head carriage 1 and the head arm 1 are mounted. Outer peripheral portions of a pair of upper and lower gimbal plates 6 made of leaf springs on the upper and lower opposite surfaces of the tips 1b and 2b of 2.
6a are fixed by welding or the like, and a pair of upper and lower magnetic heads 7 are fixed to the upper and lower opposite surfaces of the elastically supported central portion 6b of both gimbal plates 6 by adhesion or the like. A pair of upper and lower shield rings 8 are fixed by adhesion or the like, and a shield cover 9 is fixed by adhesion or the like on the side opposite to the magnetic heads 7 of the tips 1b and 2b of the head carriage 1 and the head arm 2. The pair of upper and lower pivots 10 integrally formed on the tip ends 1b and 2b of the gimbal plate 6 support the center of the central portion 6b of both gimbal plates 6 on the side opposite to the magnetic heads 7, and the upper and lower opposite surfaces of the head carriage 1 and head arm 2 are supported. The ends of the flexible printed circuit board 11 which is a pair of upper and lower wiring members arranged along the side of the magnetic head 7 are soldered to the terminals 12 of the both magnetic heads 7, and the intermediate portions of both flexible printed circuit boards 11 are soldered. It is welded to a welding dowel 13 which is integrally formed with the bridge carrier 1 and the head arm 2.

At the time of head loading, both magnetic heads 7 are elastically brought into contact with the upper and lower surfaces of a floppy disk 14, which is a disk-shaped recording medium set in a floppy disk device. Then, while the head carriage 1 and the head arm 2 are integrally fed stepwise in the radial direction of the floppy disk 14, the upper and lower surfaces of the rotationally driven floppy disk 14 are selectively recorded and / or recorded by both magnetic heads 7.
Or play. At this time, the two magnetic heads 7 are made to follow the flexure such as the waviness of the Froppy disk 14 by the elastic action of the central portions 6b of the two gimbal plates 6, so that the two magnetic heads 7 with respect to the Froppy disk 14 are moved. Get good contact. Further, both shield rings 8 and both shield covers 9 serve as magnetic shields for preventing an external magnetic field from entering the both magnetic heads 7.

However, conventionally, a hinge plate 4, a gimbal plate 6, and a shield cover 9 which are separately formed on the head arm 2, respectively.
In addition, since the shield cover 9 has a small area, the magnetic head 7 does not have a sufficient magnetic shield effect because the shield cover 9 has a small area, and the shield ring 8 is always required.

Therefore, conventionally, the number of parts and the number of assembling steps of the entire head arm 2 are very large, and the cost is remarkably high.

Therefore, the applicant of the present invention first applied for the head support device of the prior application (Japanese Patent Laid-Open No. 62-6473) in order to solve the above-mentioned drawbacks.

In the head arm of this prior application, the head arm body, the gimbal plate, and the hinge plate are integrally formed with each other by one leaf spring, and in order to secure the rigidity of the head arm body made of the leaf spring, A reinforcing member is integrally outsert-molded on the outer periphery with a synthetic resin.

[Problems to be solved by the device]

However, in this prior application, the process of integrally forming the reinforcing member on the outer periphery of the head arm main body made of a leaf spring with synthetic resin is troublesome, and the cost is high. Similar to the conventional example shown in FIG. 4, a shield ring 8 and a shield cover 9 for magnetically shielding the magnetic head 7 are required. There is a problem that the flexible printed circuit board 11 which is a wiring material is apt to be accidentally attracted to another object, and in addition, external noise is apt to jump into the flexible printed circuit board 11.

It is an object of the present invention to provide a head support member that can be manufactured easily and can enhance the magnetic shield effect of the magnetic head.

[Means for Solving the Problems]

In order to achieve the above object, the head supporting member of the present invention includes a body plate formed by a leaf spring and integrally formed with a gimbal plate, a magnetic head fixed to the gimbal plate, and a metal plate. And a reinforcing plate which is also formed on the opposite side of the main body plate from the magnetic head and is fixed in a superposed manner. The reinforcing plate also serves as a shield cover.

At this time, it is preferable to wire the wiring material to the magnetic head in a gap between the main body plate and the reinforcing plate.

[Action]

In the head supporting member configured as described above, the main body plate made of a leaf spring also serves as a gimbal plate, and the reinforcing plate made of sheet metal also serves as a shield cover, so that the number of parts and the number of assembling steps can be reduced. Moreover, the reinforcing plate can be easily fixed to the main body plate by bonding, bending, crimping or the like. Since the entire reinforcing plate constitutes the shield cover, the magnetic shield effect of the magnetic head is high.

〔Example〕

An embodiment in which the present invention is applied to a head arm of a floppy disc device will be described below with reference to FIGS. It should be noted that the same structural parts as those of the conventional example shown in FIG.

The head arm 21, which is a head support member, includes a main body plate 22 formed of a leaf spring made of a metal plate having a low rigidity such as a phosphor bronze plate or a stainless steel plate, and a press working or an etching process at the tip of the main body plate 22. Gimbal plate 23 integrally formed with the main body plate 22, a hinge plate 24 integrally formed with the base end of the main body plate 22 by press working, and a magnetic head 25 fixed to the gimbal plate 23 by adhesion or the like. And the flexible printed circuit board that is the wiring material for the magnetic head 25
26, and a reinforcing plate 27 which is formed of a thick metal plate such as an iron plate and which is also laminated on the opposite side of the main body plate 22 from the magnetic head 25 and fixed by adhesion or the like, which also serves as a shield cover.

The gimbal plate 23 is attached to the body plate 22 by a pair of pivot points.
Outer peripheral portion 23b integrally connected via 23a and its outer peripheral portion
23b and a central portion 24d integrally connected to each other via a pair of pivots 23c, and each pair of pivots 23a. A magnetic head 25 is fixed by adhesion or the like to a central portion 23d that is swingable about two axes perpendicular to each other via 23c.

The reinforcing plate 27 is also used as a large-area shield cover that covers almost the entire surface of the main body plate 22, and the outer peripheral edge 22a of the main body plate 22 is also used.
An outer peripheral rib 27a is formed integrally with the outer peripheral rib 27a. Then, a plurality of slits 28 provided on the outer peripheral edge 22a on the front end side of the main body plate 22 and a plurality of positioning holes 29 integrally formed on the reinforcing plate 27 and provided on the base side of the main body plate 22.
In a plurality of embossing dowels 30 fitted inside, the main body plate 22 and the reinforcing plate 27 are adhered with an adhesive 31.

A ridge 32 is formed along the central portion of the reinforcing plate 27 so as to bulge on the side opposite to the main body plate 22, and a groove shape is formed between the reinforcing plate 27 and the main body plate 22 inside the ridge 32. A gap 33 is formed. Then, the flexible printed circuit board 26 has this gap 33.
The flexible printed circuit board 26
The front end 26a of the magnetic head 25 is soldered to the plurality of terminals 25a of the magnetic head 25. An intermediate portion in the length direction of the flexible printed board 26 is locked by a locking portion 34 which is integrally formed inside the protrusion 32 of the reinforcing plate 27. The reinforcing plate 27 is integrally provided with a spring engaging portion 35, a connecting arm 36 to a head arm elevating member (not shown), and the like. The hinge plate 24
Is provided with a plurality of screw insertion holes 37.

The head arm 21 is constructed as described above, and as shown in FIG. 3, the hinge plate 24 is attached to the upper part of the arm mount 3 of the head carriage 1 by a plurality of screws 38 inserted through the plurality of screw insertion holes 37. Screwed. Then, the head arm 21 is pivotally biased in the direction of arrow a about the hinge plate 24 by the head arm biasing spring 39 attached to the upper part of the arm mount 3 and one end of which is locked by the spring locking portion 35. The magnetic head 25 is elastically brought into contact with the floppy disk 14.

The head arm 21 secures the rigidity of the main body plate 22 composed of a leaf spring by the reinforcing plate 27 which also serves as a shield cover.
Since the shield cover also used as the reinforcing plate 27 has a large area, the magnetic shield effect on the magnetic head 25 is high, and the conventional shield ring 8 can be omitted.

In addition, the flexible printed circuit board 26 and the main plate 22 and the reinforcing plate
Since the wiring is provided along the inside of the gap 33 between the flexible printed circuit board 27 and 27, the flexible printed circuit board 26 is never accidentally caught by another object. Further, since the flexible printed board 26 can be covered with the shield cover which is also used as the reinforcing plate 27, external noise does not jump into the flexible printed board 26 at all.

The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various effective modifications can be made based on the technical idea of the present invention.

In the above-mentioned embodiment, the head arm is shown as the head support member, but the present invention can be applied to a head carrier and the like.

In the above embodiment, the main body plate and the reinforcing plate are adhered with an adhesive, but they can be easily fixed by bending or crimping.

Further, the present invention can be applied to a head support member of various recording / reproducing devices other than the Froppy disc device shown in the above embodiment.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

The body plate made of leaf springs also serves as the gimbal plate, and the reinforcing plate made of sheet metal also serves as the shield cover, so that the number of parts and the number of assembly steps can be reduced, and the reinforcing plate is adhered, bent, crimped, etc. to the body plate. The head support member is simple to manufacture and low in cost because it can be easily fixed.

Since the entire reinforcing plate constitutes the shield cover, the shielding effect of the magnetic head can be enhanced and the shield ring which has been conventionally required can be omitted.

As shown in the above embodiment, if the broken line material to the magnetic head is wired in the gap between the main body plate and the reinforcing plate, the wiring material will not be accidentally attracted to other objects. It is also possible to prevent external noise from jumping into the wiring material.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is an exploded perspective view of a head arm, FIG. 2 is a bottom view of the head arm, and FIG. 3 is III of FIG. -III is a sectional view taken along the arrow. FIG. 4 is a sectional view showing a conventional example. In the drawings, reference numerals 21 ... Head arm (head supporting member) 22 ... Main body plate 23 ... Gimbal plate 24 ... Hinge plate 25 ... Magnetic head 25 ... Flexible printed circuit board (wiring material) 27 ... Reinforcement plate 33 ... It is a gap.

Claims (2)

[Scope of utility model registration request] 1. A body plate integrally formed with a gimbal plate by a leaf spring, a magnetic head fixed to the gimbal plate, and a magnetic body formed by a sheet metal. A head supporting member comprising: a reinforcing plate which is fixed on the opposite side of the head so as to overlap with the head and also serves as a shield cover. 2. The head supporting member according to claim 1, wherein a wiring material for the magnetic head is wired in a gap between the main body plate and the reinforcing plate.