JPS62264406A - Floppy disk device - Google Patents

Abstract

PURPOSE:To heighten traceability for the waving deflection of a magnetic disk, by fixing a shield plate extended to the lower plane of a lower head along the lower arm consisting a pair of clip arms supported in such a way that they can fluctuate freely, at a carriage. CONSTITUTION:A pivot 3b is provided, and a loading spring 17 is loaded at a presser board 3, and an upper head 7, and a lower head 12 fixed respectively at an upper arm 6, and a lower arm 11, are provided so as to be energized in a direction to bring into contact closely in a state they face both planes of a magnetic disk 50. A shield plate 18 is fixed steadily at the tip end part of a carriage 2 by a presser plate 19 with screws 20 and 21, and it is extended to the lower head 12 along the lower plane side of the lower arm 11. Consequently, the desired shield effect of the lower head 12 for an external magnetic field can be obtained, and also, the pair of clip arms are lightened. In this way, it is possible to heighten the traceability for the waving deflection of the magnetic disk.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floppy disk drive, particularly a magnetic disk that closely adheres to a magnetic disk and performs read/write operations [Prior art] A magnetic recording coating is applied to the back surface of a flexible disk. Floppy disks are well known and have become widely used as simple magnetic recording media in computers in recent years.

A floppy disk drive is well known in which information is written/read by moving a magnetic head to a predetermined track while rotating the floppy disk to perform desired writing/reading on this type of floppy disk. .

In FIG. 2, a carriage 2 is supported by a guide rail 1 so as to be able to reciprocate in a magnetic disk drive, as is well known. An arm pair support section 2a for supporting the clip arm pair is provided at the tip of the carriage 2.

The clip arm pair includes an upper arm 6 and a lower arm 11, and is fixed to the carriage 2 by the tightening force of a screw 5 by the pressing plate 4 via a clip spring 6a integrally molded on the pressing table 3.

A spring 17 is attached to urge the upper head 7 and lower head 12, which are fixed to the upper arm 6 and lower arm 11, respectively, in a direction in which they come into close contact with each other while facing both sides of the magnetic disk 50.

A support spring 6a is integrally molded on the upper arm 6.
It is fixed to the stamping stand 6 by the stamping plate 9 with the tightening force of screws 10. Further, an upper head 7 is fixed to the tip via a gimbal spring.

The lower arm 11 is secured by a pressing plate 15 and a screw 16.
It is fixed with screws to the press base. There is a support plate 16 at the tip.
The lower head 12 is fixed through the lower head 12, and a shield plate 14 is attached to the lower surface of the lower head 12 as a noise countermeasure against the external magnetic field of the lower head 12.

[Problem that the invention seeks to solve]

In recent years, the recording density of floppy disk drives has increased significantly, and stable read/write characteristics are required.

For this reason, in the above-mentioned read/write head, the shielding effect against external magnetic fields has become a problem, and great attention has been paid to noise countermeasures.

Usually, the read/write head is fixed to an arm, and a shield plate is attached to the back side of the arm. In addition, in order to provide sufficient noise countermeasures, it is attached so as to cover the magnetic head, making it larger and increasing its shielding effect.

However, in order to obtain stable read/write characteristics, it is essential that the above-mentioned swingably supported pair of clip arms has improved ability to follow the five torsion deviations in the vertical direction that occur during rotation of the magnetic disk. However, an increase in the weight of the shield plate due to an increase in size in order to improve the shielding effect results in an increase in the weight of the pair of clip arms, resulting in a problem in that the followability is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a read/write head with a sufficient shielding effect against external noise and to improve followability of the waviness deviation of a magnetic disk.

[Means for solving problems]

In order to achieve the above object, the present invention eliminates the shield plate attached to the lower arm of the pair of clip arms that is swingably supported on the carriage via the clip spring, and attaches the shield plate to the lower arm. It is characterized in that a shield plate extending overflowing to the lower surface of the lower head is fixed to the carriage.

〔Example〕

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a preferred embodiment of the present invention, illustrating a magnetic head support mechanism for reading/writing a micro-floppy disk (3.5 inches).

As is well known, a magnetic disk drive has a guide rail 1.
The carriage 2 is supported so as to be able to reciprocate. An arm pair support section 2a for supporting the clip arm pair is provided at the tip of the carriage 2.

The clip arm pair includes an upper arm 6 and a lower arm 11, and is fixed to the carriage 2 by the tightening force of a screw 5 by the pressing plate 4 via a clip spring 6a integrally molded on the pressing joint.

There is a bibono) 3b in the Oshikoai Otsu, and a loading spring 1
The upper head 7 and the lower head 12, which are attached to the head 7 and fixed to the upper arm 6 and the lower arm 11, respectively, are biased in a direction in which they are brought into close contact with each other while facing both surfaces of the magnetic disk 500.

A support spring 6a is integrally molded on the upper arm 6.
It is fixed to the pusher plate 9 by the tightening force of the screws 10 by the pusher plate 9. Further, an upper head 7 is fixed to the tip via a gimbal spring.

In the present invention, as in the embodiment shown in FIG.
It was firmly fixed with two screws 20 and 21, and extended along the lower surface of the lower arm 11 to the lower head 12.

As described above, the desired shielding effect of the lower head 12 against the external magnetic field can be obtained, the weight of the clip arm pair can be reduced, and the ability of the upper and lower heads 7.12 to follow the 5-torsional deviation of the magnetic disk can be improved. Ta.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, by fixing a sufficiently wide shield plate to the carriage to reach the magnetic head, it is possible to reduce the weight of the arm pair and follow the undulation deviation of the magnetic disk. At the same time, the shielding effect against external noise was improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a double-sided head support mechanism of a magnetic disk drive showing an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a double-sided head support mechanism of a conventional magnetic disk drive. 1...Guide rail, 2...Carriage, 6...Pushing joint, 3b...Pivot, 4.15,19...Pushing Work board, 5.16.20.21...Screw, 6.11...
... Arm, 6a ... Support spring, 7.12 ... Head, 14.18 ... Shield plate.

Claims (1)

[Claims] The floppy disk drive includes a carriage movable in the radial direction, and a pair of clip arms swingably supported by the carriage via clip springs, the pair of clip arms extending along both sides of the floppy disk and opening and closing with each other. It includes upper and lower arms that are freely pivoted, and read/write heads are fixed to each of the upper and lower arms to perform read/write operations in close contact with the magnetic disk, and the carriage has a shield extending from the lower surface of the head of the lower arm. A floppy disk drive characterized by a fixed plate.