JP2592370Y2 - Magnetic disk drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly, to a structure for mounting a peripheral portion of a magnetic head.

[0002]

2. Description of the Related Art As is well known, a head feed mechanism of a magnetic disk drive device using a so-called "3.5 inch" floppy disk as a recording medium has a structure as shown in FIGS. The symbol "1A" is guided along a guide rod 4A of an apparatus frame 3A extending in a direction parallel to the slot 2a of the magnetic disk holder 2A.
A flexible leaf spring 6 is cantilevered to a base 1a of the "0" side carriage 1A via a spacer 5 by a mounting bracket 7A and a fixing screw 8A.

The free end 6a of the leaf spring 6 is provided with a base 9a of a "1" side carriage 9A which is formed by pressing a thin metal plate as a rigid member.
The driven ear 9b, which is supported by 0 and protrudes from the intermediate portion of the "1" side carriage 9A, comes into contact with the opening edge 2b of the slot 2a of the magnetic disk holder 2A. The mounting bracket 7A is provided with mounting ears 7a, and the support rod 11 supported by the mounting ears 7a is provided with the "1".
A biasing spring 12A for pressing the driven ear 9b of the side carriage 9A against the opening edge 2b of the magnetic disk holder 2A is attached.

On the surfaces of the "0" side carriage 1A and the "1" side carriage 9A near the leading end, gimbals 13A, 1 made of a flexible thin metal plate are provided.
4A, the "0" side magnetic head 15A and "1"
The side magnetic heads 16A are fixed respectively, and "0" is applied to the center of these gimbals 13A and 14A.
Side carriage 1A and "1" side carriage 9A
The "0" side magnetic head 15A and the "1" side magnetic head 16A are point-supported by the pivot projections 1b and 9c.

FIG. 12 is an exploded view of the tip of the aforementioned "1" side carriage 9A. The pivot projection 9c, the gimbal 14A, and the "1" side magnetic head 16A, which may be made of a member different from the carriage. Shows the relationship
The peripheral portion 14a of the gimbal 14A made of a flexible thin metal plate is fixed to the lower surface of the tip of the "1" side carriage 9A using an adhesive. Gimbal 1
Connecting portions 14b and 14c oriented at right angles to each other so as to be able to freely tilt in a plane perpendicular to the plane containing 4A.
The shield case 17A of the "1" side magnetic head 16A is adhered to the lower surface of the central portion 14d supported by the head, and the tip of the pivot projection 9c integrally formed with the "1" side carriage 9A is the upper surface of the central portion of the gimbal 14A. Contacted. In FIG. 12, reference numeral "18A" is "1".
This is a flexible printed board for the side magnetic head 16A.

[0006]

Therefore, "1" in the conventional magnetic disk drive as described above.
The side magnetic head 16A is located at the center 1 of the gimbal 14A.
Since it can be freely tilted with the pivot projection 9c applied via 4d as a fulcrum, the "1" side magnetic head 16
A can follow the surface change of the magnetic disk. However, according to the relationship between the "1" side magnetic head 16A, the gimbal 14A, and the pivot protrusion 9c, the flexible central portion 14d is provided for the "1" side magnetic head 16A.
The pivot projection 9c is acted on through this, so that not only the tilting posture of the "1" side magnetic head 16A becomes unstable, but also the central portion 14d which is easily deformed by an external force and the shield of the "1" side magnetic head 16A. A shearing force acts in a direction parallel to the surface of the gimbal between the case 17A and the case 17A, and there is a problem that the reliability of the bonded portion between the two is reduced. In view of the above-mentioned problems of the conventional magnetic disk drive device, the present invention can stably support the magnetic head at a point, and does not apply an excessive force to the central portion of the gimbal which is easily deformed. To obtain a magnetic disk drive device.

[0007]

According to the present invention, a magnetic head shield case is fixed to a central portion of a flexible gimbal having a peripheral portion fixed to a carriage. In a magnetic disk drive device in which the magnetic head is point-supported by a pivot member applied from the opposite side, a part of the surface wall of the shield case is bent toward the center of the back of the magnetic head to form a pivot receiver, and the gimbal The present invention proposes a magnetic disk drive device in which a through hole is formed at the center of the central portion and the pivot member contacts the pivot receiver through the through hole.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of an embodiment of the present invention will be described below with reference to FIGS. 1 to 6 show a first embodiment of the present invention, in which the present invention will be described later.
1 "is embodied at the tip of the side carriage 9. The resin molded" 0 "side carriage 1 integrally formed with a pedestal-shaped base has a driven portion 1c at the lower portion of the intermediate portion, and the driven portion 1c is The magnetic disk holder 2 is guided along a guide rod 4 of the device frame 3 extending in a direction parallel to the slot 2a.

The base 1a of the "0" side carriage 1
A support pin 22 capable of supporting the biasing spring 12 described in detail later is integrally formed on the back surface of the first member. Since this support pin 22 extends in a direction parallel to the guide rod 4, the insertion of the coil portion 12a of the biasing spring 12 from its tip only causes the biasing spring 12 to move to the "0" side carriage 1. Can be fixed to the base 1a. In the center of the tip of the “0” side carriage 1, a thin portion 1 d which is made flexible by sufficiently reducing the thickness is formed, and is seated on the surface of the thin portion 1 d. "Side Magnetic Head 1
The fifth connection pin 15a is fixed to the flexible printed circuit board 23 with solder while sandwiching the thin portion 1d.

The base 1a of the "1" side carriage 9, which is pressed as a rigid member from a thin metal plate, is attached to the base 1a of the "0" side carriage 1 in the same manner as in the prior art. Fixed directly at 8. That is, the "1" side carriage 9 is formed as a rigid member by bending a peripheral wall 9c at an intermediate portion and a distal end portion into an "L" shape in cross section, and a pair of driven walls is provided on the peripheral wall 9c at the intermediate portion. The ears 9b are cut and raised, and these driven ears 9b are inserted into the slots 2a of the magnetic disk holder 2.
Abuts on the opening edge 2b.

Referring to FIG. 3, "0" side carriage 1
As for the mounting relationship between the "1" side carriage 9 and the "1" side carriage 9, the above-mentioned peripheral wall 9c is not formed on the base 9a of the "1" side carriage 9, and the fixing screw 8 is provided on the surface thereof.
Since the through hole 24 into which the screw portion of the side carriage 9 can be inserted is formed, the fixing is performed with the base 9a of the "1" side carriage 9 interposed between the base 1a of the "0" side carriage 1 and the mounting bracket 7. By tightening the screw 8, the base 9a of the "1" side carriage 9 can be firmly fixed to the base 1a of the "0" side carriage 1.

Further, a "U" -shaped cutout 25 is formed in a portion 9e near the base of the "1" side carriage 9, so that the sectional modulus of the portion 9e near the base is changed by the cutout 25. Is smaller than the part. For this reason, the portion 9e near the base has sufficient flexibility,
A state is obtained in which the tip of the 1 "side carriage 9 is flexibly supported by the base of the" 0 "side carriage 1.

Although the fixed end 12b of the biasing spring 12 in which the coil portion 12a is supported by the support pin 22 is locked to the back of the base 1a, the biasing end 1 of the biasing spring 12 is
2c is a "1" side magnetic head 16 as described later.
Is pressed against the pivot receiver 17a of the shield case 17, the driven ear 9b of the "1" side carriage 9 is driven by the opening edge 2b of the magnetic disk holder 2 by the force of the biasing spring 12.

FIG. 4 shows the characteristic of the present invention in the vicinity of the leading end of the "1" side carriage 9 and the peripheral portion 14 of the gimbal 14 made of a thin metal plate which is flexible as in the prior art.
“a” is fixed to the lower surface of the tip of the “1” side carriage 9 using an adhesive. The shield case 17 of the "1" side magnetic head 16 is supported by connecting portions 14b and 14c oriented at right angles to each other so that the shield case 17 can freely tilt in a plane perpendicular to the plane including the gimbal 14. It is adhered to the lower surface of the center portion 14d.

FIGS. 5 and 6 show the shield case 17 of the above-mentioned "1" side magnetic head 16, and a bottom wall of the shield case 17 pressed by a metal plate has a built-in magnetic core (not shown). A gap window 17b that can expose the gap is formed. And shield case 1
An incision groove 17c is formed in one side wall 7 and the opening wall separated from the side wall 17d by the incision groove 17c is deformed in a direction perpendicular to the side wall 17d, and the tip reaches the center of the opening. It constitutes a pivot receiver 17a. Therefore, although the urging end 12c of the urging spring 12 described above can contact the surface of the rigid pivot receiver 17a, the urging end 12c and the pivot receiver 17a are in direct contact with each other. As shown in FIG. 4, the relief holes 2 are formed on the surface of the "1" side carriage 9 and the central portion 14d of the gimbal 14.
6 and through holes 27 are respectively formed. In FIG. 4,
Reference numeral “18” denotes a flexible printed circuit board for the “1” side magnetic head 16.

In the embodiment shown in FIGS. 1 to 6, the biasing end 12c of the biasing spring 12 is connected to the shield case 1.
7, the present invention is not limited to this structure. For example, another pivot member such as a pivot projection integrally formed on the carriage may be connected to the pivot receiver 17a of the shield case 17. 17a may be contacted.

Returning to FIG. 1, a feed motor 2 is provided on the surface of the apparatus frame 3 adjacent to the "0" side carriage 1.
The driven screw 30 of the feed motor 28 extending in a direction parallel to the guide rod 4 is engaged with a driven projection 30 of an extension 1b integrally formed on the side of the "0" side carriage 1. The feed screw 29
The "0" side carriage 1 and "0"
The 1 "side carriage 9 is fed in the radial direction of the magnetic disk.

Since the magnetic disk drive according to the illustrated embodiment has the above-described structure, when a magnetic disk (not shown) is inserted into the magnetic disk holder 2, the opening and closing provided on the magnetic disk holder 2 is performed. Although the shutter of the floppy disk is released by the mechanism, when the floppy disk is completely loaded in the magnetic disk holder 2, the magnetic disk holder 2 is lowered downward in FIG. Therefore, as the magnetic disk holder 2 moves down, the force of the urging spring 12 causes the "1" side carriage 9 to move.
Are tilted toward the magnetic disk holder 2, and the “0” side magnetic head 15 and the “1” side magnetic head 16 supported by the “0” side carriage 1 and the “1” side carriage 9 are on both surfaces of the magnetic disk. The recording medium is resiliently contacted and information is recorded and reproduced on the surface of the magnetic disk by the activation of the feed motor 17.

In the case of recording / reproducing information by the magnetic head, the urging end 12c of the urging spring 12 passes through the escape hole 26 of the "1" side carriage 9 and the through hole 27 of the gimbal 14, and the "1" side. Since the pivot head 17a of the magnetic head 16 having high rigidity is brought into contact with the pivot head 17a, the "1" side magnetic head 16 can freely tilt about the biasing end 12c as a fulcrum. Therefore, a reliable tilting movement of the "1" side magnetic head 16 with the biasing end 12c of the biasing spring 12 as a fulcrum can be obtained. It will be able to follow, and "1"
It is possible to prevent an erroneous operation from occurring when the side magnetic head 16 transmits and receives information.

In the structure of the first embodiment, the biasing spring 1
Since the external force from the biasing end 12c of the second 2 does not directly act on the central portion 14d of the gimbal 14, the gap between the shield case 17 of the "1" side magnetic head 16 and the gimbal 14 bonded to the gimbal 14 is eliminated. No shearing force acts on the gimbal 14 and the 1 "side magnetic head 16.
And the reliability of the bonding state between them can be secured.

FIGS. 7 and 8 show a shield case 17A used in the second embodiment of the present invention. A gap window 17b is formed in a bottom wall 17e of the shield case 17A which is pressed with a metal plate. This is the same as in the first embodiment. In this embodiment, the projection, that is, the pivot receiver 17f, which is cut and raised from the bottom wall 17e of the shield case 17A toward the opening, is bent. Therefore, as shown in FIG. 8, the biasing end 12c of the biasing spring 12 can be brought into contact with the distal end surface of the pivot receiver 17f of the shield case 17A.
With the structure of 7A, the same operation and effect as in the first embodiment can be expected.

FIGS. 9 and 10 show a shield case 17B used in a third embodiment of the present invention. A gap window 17b is formed in a bottom wall 17e of the shield case 17B which is pressed with a metal plate. This is the same as in the first embodiment. In this embodiment, a flap or pivot receiver 17g extending toward the center of the opening is bent at a right angle to the opening edge of the side wall 17d of the shield case 17B. Therefore, the urging end 12c of the urging spring 12 can be brought into contact with the front end surface of the pivot receiver 17g of the shield case 17B as shown in FIG. The same operational effects as in the case of can be expected.

In the embodiment described above, the present invention is applied to the "1" side carriage, but the present invention may be applied to the magnetic head of the "0" side carriage. Needless to point out.

[0024]

As is apparent from the above description, according to the present invention, the pivot receiver is formed integrally with the shield case of the magnetic head and the pivot member is brought into contact with the pivot receiver, so that the pivot member is used as a fulcrum. The magnetic head can be reliably tilted so that the magnetic head can reliably follow changes in the surface of the magnetic disk. Further, according to the same structure of the present invention, since an unreasonable shearing force does not act between the gimbal to which the magnetic head is bonded and the magnetic head, the reliability of the bonded portion can be ensured.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of a main part of a magnetic disk drive device according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an exploded perspective view of a carriage mounting portion of the magnetic disk drive device.

FIG. 4 is an enlarged perspective view of a main part showing a relationship between a magnetic head and a gimbal of the magnetic disk drive device.

FIG. 5 is an enlarged plan view of a magnetic head shield case used in the magnetic disk drive device.

FIG. 6 is an enlarged sectional view of the shield case.

FIG. 7 is an enlarged plan view of a shield case for a magnetic head used in a second embodiment of the present invention.

FIG. 8 is an enlarged sectional view of the shield case.

FIG. 9 is an enlarged plan view of a shield case for a magnetic head used in a third embodiment of the present invention.

FIG. 10 is an enlarged sectional view of the shield case.

FIG. 11 is an enlarged sectional view of a main part of a conventional magnetic disk drive device.

FIG. 12 is an enlarged exploded perspective view showing a relationship between a magnetic head and a gimbal of the magnetic disk drive device.

[Explanation of symbols]

 9 "1" side carriage 12 biasing spring 12c biasing end (pivot member) 14 gimbal 14a peripheral portion 14d central portion 16 "1" side magnetic head 17, 17A, 17B shield case 17a, 17f, 17g pivot receiver

Claims (1)

(57) [Scope of request for utility model registration] 1. A magnetic head shield case is fixed to a central portion of a flexible gimbal having a peripheral portion fixed to a carriage, and the magnetic head is pointed by a pivot member applied from a side opposite to the magnetic head. In the magnetic disk drive device to be supported, a part of the surface wall of the shield case is bent toward the center of the back of the magnetic head to form a pivot receiver, and a through hole is formed at the center of the gimbal, and the through hole is formed. A magnetic disk drive device, wherein the pivot member passes through the pivot member to contact the pivot receiver.