JPH05314628A - Magnetic head unit - Google Patents

Abstract

PURPOSE:To improve the performance of a device, to miniaturize it and to make it thin by eliminating a cause for hindering the miniaturization of the magnetic head unit due to a head supporting member with simple constitution. CONSTITUTION:At a magnetic head unit 15 for which a magnetic head 16 formed so that a magnetic core 24 are held from both sides therebetween by sliders 23a and 23b is stuck to the fixing part of one surface of a head supporting member 17 formed in rough flat condition, the main bottom surface of the magnetic head 16 fixed to the fixing part of the head supporting member 17 is positioned in the projecting surface of the magnetic head 16 and made smaller in size than the projecting area of the magnetic head 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head unit for recording / reproducing / erasing information on / from a storage medium such as a magnetic disk.

[0002]

2. Description of the Related Art Generally, a flexible disk drive (FD) is used for a magnetic storage device such as a personal computer.
D), hard disk drive (HDD) and the like are frequently used. A magnetic head unit is mounted on these FDD, HDD and the like. Further, this magnetic head unit is formed by fixing a magnetic head for recording / reproducing / erasing information on a recording medium such as a flexible disk (FD) to a head supporting member called a gimbal plate. ..

Hereinafter, such a conventional magnetic head unit will be described with reference to FIGS. 6 and 7.

FIG. 6 is a front view showing a main part of a conventional magnetic head unit, and FIG. 7 is a partially cut side view showing the main part.

As shown in FIGS. 6 and 7, in a conventional magnetic head unit 1 of this type, a magnetic head 3 whose side surface is covered with a shield ring 2 is made of a conductive metal such as stainless steel or a copper alloy. The elastic thin plate is fixed to a gimbal plate 4 as a head supporting member formed in a predetermined shape by an appropriate bonding member (not shown) such as an adhesive.

In the magnetic head 3, a recording / reproducing magnetic core and an erasing magnetic core are integrally formed between a pair of sliders 5a and 5b made of a non-magnetic material such as ceramic or non-magnetic ferrite. The composite type magnetic core 6 thus formed is sandwiched and formed by glass bonding or the like. The main sliding surface 7 having the magnetic core 6 and the sub sliding surface 8 protruding from the upper surface of the one slider 5b are formed in parallel with each other at an appropriate interval. Then, the sliders 5a,
A shield ring 2 that shields external noise is attached to the outer periphery of 5b by an appropriate method such as fitting or bonding. The shield ring 2 is made of an appropriate magnetic shield material, and is formed in a flat rectangular ring shape.

Further, the conventional gimbal plate 4 is FD
It has flexibility to follow the waviness of This is obtained by forming appropriate slits 9, 9 ... In the X and Y directions, as shown in FIG. And
The slits 9, 9, ... Divide the gimbal plate 4 into an outer frame 10, a middle frame 11, and an inner frame 12 from the outer peripheral side. Further, connecting portions 10a, 10a connecting the outer frame 10 and the middle frame 11 and connecting portions 11a, 11a connecting the middle frame 11 and the inner frame 12 are arranged so as to be orthogonal to the X and Y directions. Has been done. In addition, the inner frame 12 shown by diagonal lines in the drawing
One of the surfaces is a fixing portion 14 to which the lower surface 13 of the magnetic head 3 (the surface opposite to the FD) is fixed.

The size of the fixed portion 14 is larger than the projected area of the magnetic head 3 whose side surface is covered with the shield ring 2.

The total height of the conventional magnetic head unit 1 is about 2.5 mm.

[0010]

By the way, at present,
Products such as FDDs and HDDs are constantly being made higher in performance, smaller and thinner, and the magnetic head unit 1 is also being made higher in performance, smaller and thinner like products. And
In order to reduce the size of the magnetic head unit 1, it is required to reduce the area of the gimbal plate 4.

The present invention has been made in view of these points, and overcomes the above-mentioned problems with the conventional ones.
It is an object of the present invention to provide a magnetic head unit which has a simple structure and which is capable of achieving high performance, miniaturization, and thinning by removing a factor that hinders miniaturization of the magnetic head unit due to the gimbal plate.

[0012]

In order to achieve the above-mentioned object, in the magnetic head unit of the present invention, a magnetic head formed so as to sandwich a magnetic core from both sides by a slider is formed in a substantially flat plate shape. In the magnetic head unit fixed to the fixed portion on one surface of the head support member,
The fixed portion of the head support member and the main bottom surface of the magnetic head fixed to the fixed portion are located in the projection plane of the magnetic head and smaller than the projected area of the magnetic head.

[0013]

According to the magnetic head unit of the present invention having the above-mentioned structure, the magnetic head unit is located in the projection surface of the magnetic head and is similar to the fixed portion of the head supporting member formed smaller than the projection area of the magnetic head. It is possible to fix the magnetic head with the main bottom surface formed smaller than the projected area of the magnetic head while being located in the projection surface of the magnetic head, and to reduce the overall surface shape and area of the gimbal plate.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view showing an entire main part of a first embodiment of a magnetic head unit according to the present invention, FIG. 2 is a plan view of the main part, and FIG. 3 is a partial cut of the main part. FIG. 4 is a side view, and FIG. 4 is a perspective view of the magnetic head with its main bottom surface facing upward.

As shown in FIGS. 1 to 4, in the magnetic head unit 15 of the present embodiment, the magnetic head 16 is appropriately joined to the gimbal plate 17 which is a head supporting member by an adhesive (not shown) or the like as in the conventional case. It is fixed by a member.

The gimbal plate 17 is made of stainless steel, copper alloy, or the like. After being made into a thin plate having elasticity, it is provided with predetermined slits 18, 18 ... The outer frame 19, the middle frame 20, and the inner frame 21 are provided from the outer peripheral side.
Are formed. The connecting portions 19a, 19a connecting the outer frame 19 and the middle frame 20 and the connecting portions 20a, 20a connecting the middle frame 20 and the inner frame 21 are arranged so as to be orthogonal to the X and Y directions. Has been done. Further, the surface of the inner frame 21 shown by the hatched portion in FIG. 2 is a fixing portion 22 for fixing the magnetic head 16, and its shape and size are within the projection plane of the magnetic head 16 on the gimbal plate 17. It is formed so as to be located and smaller than its projected area.

In the magnetic head 16 of this embodiment, the recording / reproducing magnetic core 13 is provided between the pair of sliders 23a and 23b made of a non-magnetic material such as ceramic or non-magnetic ferrite as in the conventional case. A composite type magnetic core 24 integrally formed with the erasing magnetic core 14 is sandwiched and formed by glass bonding or the like. Then, the main sliding surface 25 having the magnetic core 24 and one slider 2
A sub-sliding surface 26 protruding from the upper surface of 3b is formed in parallel with an appropriate interval. Further, a main bottom surface 27 fixed to the fixing portion 22 is formed on the surface of the magnetic head 16 facing the gimbal plate 17. As shown in FIGS. 3 and 4, the main bottom surface 27 has a shape having an area that is reduced by a desired amount from a projection surface that connects the four outer peripheral sides of the sliders 23a and 23b over an appropriate height H. There is. Further, the shape and size of the main bottom surface are made substantially equal to the shape and size of the surface of the fixing portion 22 of the gimbal plate 17 shown by hatching in FIG.

A shield ring 28 for preventing external noise from wrapping around the magnetic head 16 is fitted or adhered to the outer circumferences of the sliders 23a and 23b by an appropriate method such as fitting or adhering to the gimbal plate 17 and the height H. It is installed with. The shield ring 28 is made of an appropriate magnetic shield material, and is formed in a flat rectangular ring shape.

The above-mentioned dimension of the height H is FDD,
When the gimbal plate 17 is deformed in response to the deformation of the FD during the operation of a device such as an HDD, the outer peripheral end portion separated from the gimbal plate 17 of the magnetic head 16 by a height H, a shield ring in this embodiment. It suffices that the outer peripheral end portion 29 of 28 comes into contact with the outer frame 19 and the middle frame 20 of the gimbal plate 17 and causes no operation error.

It is desirable that the magnetic head 16 be smaller than the conventional magnetic head 3.

Next, the operation of this embodiment having the above-mentioned structure will be described.

The magnetic head unit 15 of this embodiment is formed by fixing the main bottom surface 27 of the magnetic head 16 to the fixing portion 22 of the gimbal plate 17. The main bottom surface 27 of the magnetic head 16 is the shield ring 2 in this embodiment.
The magnetic head 16 is located within the projection surface of the magnetic head 16 surrounded by the outer periphery of the magnetic head 8, and is formed smaller than the projected area of the magnetic head 16. Further, the shape and size of the main bottom surface 27 are formed to be substantially the same as the shape and size of the fixing portion 22 of the gimbal plate 17.

Therefore, according to this embodiment, unlike the conventional case,
The fixing portion 22 of the gimbal plate 17 is attached to the magnetic head 16
It can be formed to be small corresponding to the main bottom surface 27 of the. Therefore, the overall size of the gimbal plate 17 can be reduced accordingly. For example, according to this embodiment, the maximum size of the outer frame 19 of the gimbal plate 17 can be about 8 mm in length and about 6 mm in width, and the conventional gimbal plate 4 has a length of about 14.6 m and a width of about 6 mm. The size can be greatly reduced as compared with the one having 12.7 mm. Thus, according to the present embodiment, FDD,
It is possible to reliably remove the factors that hinder the downsizing of devices such as HDDs. With regard to the size of the gimbal plate 17, for example, it is possible to insert the entire gimbal plate 17 into a window for inserting a magnetic head of a 3.5-inch FD cartridge, such as an FDD or HDD. The miniaturization of the device can be further improved.

The magnetic head unit 15 without the shield ring 28 can be similarly applied.

Further, in the present embodiment, the main bottom surface 27 is formed by reducing the outer four sides of the sliders 23a and 23b by a desired amount, but it is not necessary to reduce all four outer sides of the sliders 23a and 23b. , Sliders 23a, 23
Various modifications such as reducing only one side of the outer circumference of b can be made, and the present invention is not particularly limited to this embodiment.

FIG. 5 shows a second embodiment of the present invention. In this embodiment, by forming an appropriate concave portion 30 on the outer peripheral portion of the surface of the shield ring 28a facing the gimbal plate 17a, The entire bottom surface of the magnetic head 16a and a part of the shield ring 28a are aligned with each other and positioned in a projection plane connecting the outer circumferences, and a main bottom surface 27a smaller than the projection area is formed. The other structure is similar to that of the first embodiment described above.

Even with such a configuration, the above-mentioned first
The same effect as that of the embodiment can be obtained.

The present invention is not limited to the above embodiment, but can be modified as necessary.

[0030]

As described above, according to the magnetic head unit of the present invention, in the projection surface of the magnetic head, the main bottom surface smaller than the area of this projection surface, and the shape and the shape substantially the same as this main bottom surface, A gimbal plate having a fixed portion formed in a size can be fixed to the gimbal plate. By reducing the size of the fixed portion of the gimbal plate, the overall size of the gimbal plate can be reduced and the magnetic head unit itself and This has an extremely excellent effect that it is possible to reduce the size of a device such as an FDD equipped with this.

[Brief description of drawings]

FIG. 1 is a perspective view showing an essential part of an entire first embodiment of a magnetic head unit of the invention.

FIG. 2 is a plan view of a main part of FIG.

FIG. 3 is a partially cut side view of a main part of FIG.

FIG. 4 is a perspective view of the magnetic head with the main bottom surface facing up.

FIG. 5 is a side view showing an essential part of a second embodiment of the magnetic head unit of the invention.

FIG. 6 is a plan view showing a main part of a conventional magnetic head unit.

7 is a partially cut side view of the main part of FIG.

[Explanation of symbols]

 15 magnetic head unit 16, 16a magnetic head 17, 17a gimbal plate 22 fixing part 27 27a main bottom surface 28, 28a shield ring

Claims (1)

[Claims] 1. A magnetic head unit in which a magnetic head formed so as to sandwich a magnetic core from both sides by a slider is fixed to a fixed portion on one surface of a head support member formed in a substantially flat plate shape. The fixed portion of the head support member and the main bottom surface of the magnetic head fixed to the fixed portion are located within the projection plane of the magnetic head and smaller than the projected area of the magnetic head. unit.