JPS63316305A - Magnetic head device - Google Patents

Abstract

PURPOSE:To use an upper side magnetic head device and a lower side magnetic head device in common and to simplify assembling and replacing of the magnetic heads by allowing a shielding plate to directly support a spring plate for supporting a head slider and fitting the head slider through a fitting part of the shielding plate. CONSTITUTION:A magnetic head 31 is constituted of a head slider 33 holding a read/write core 32 and an erase core, a gimbal spring 34 to be a spring plate for supporting the head slider 33, the 1st shielding plate positioned under the spring 34, and the 2nd shielding plate positioned on the upper part of the spring 34. Since the magnetic head, the plate spring and the shielding plates can be treated as one unit, the assembling and replacement of the magnetic head device can be simplified, its assembling cost can be reduced and both the lower and upper heads can be used in common.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head device for writing and/or reading information to and/or from a disk-shaped magnetic recording medium.

[Conventional technology]

A magnetic head used for data recording is generally supported by a carriage or a hold case serving as a magnetic head support member, either directly or via a gimbal spring, and a shield plate for magnetic shielding is provided behind the magnetic head. This example will be explained in detail.

FIG. 5 is a sectional view of a magnetic head assembly disclosed in Japanese Patent Application Laid-Open No. 62-60165.

In the figure, the magnetic heald assembly 1 is composed of a lower magnetic heald assembly 2 and an upper magnetic heald assembly 3.
0, and is transported in the radial direction of the magnetic disk 5 along the guide shaft 4 by a pulse motor (not shown).

A lower magnetic head assembly (hereinafter referred to as a carriage) 2 has a lower magnetic head 7 attached to its tip via a gimbal spring 6, and a flexible printed circuit board 9 connected to a lead wire 8 led out from the magnetic head 7. and a lead terminal 10 connected to the flexible printed circuit board 9 and protruding toward the base end side of the carriage 2.

The lead terminal IO is made by dividing a good conductive metal plate into five parts and molding them with an insulating synthetic resin material, one end of which is
It extends to the vicinity of gimbal spring 6. In addition, the carriage 2 formed by molding includes a pivot 1) that contacts the lower surface of the magnetic head 7 mounting portion of the gimbal spring 6 to ensure contact with the magnetic disk 5;
A support portion 12 is formed that has a cylindrical contact surface that directly contacts and supports a hold case 3, which will be described later.

The upper magnetic head assembly 30 is attached to the hold case 3
It consists of a stop plate 16, and a leaf hinge spring 14 that rotatably supports the hold case 3 with respect to the stop plate 16,
An upper magnetic head 13 is fixedly mounted on the hold case 3 at a position facing the lower magnetic head 7 on the carriage 2 side with a plate 21 interposed therebetween. The hold case 3 is further abutted with a load spring 19 stretched from the holding plate 18 to spring the hold case 3 toward the carriage 2, and this elastic force is applied to the load spring 19 attached to the holding plate 18. The adjustment screw 20 allows adjustment to the optimum state.

Further, shield plates 23.2 are provided on the lower surface of the lower magnetic head 7 mounting portion and the upper surface of the upper magnetic head 13 mounting portion, respectively.
4 is attached to protect against noise.

[Problem that the invention seeks to solve]

By the way, in the above magnetic head assembly, the gimbal spring 6 and the plate 21 are connected to the carriage 2).
When attaching them to the hold case 3, they were fixed by adhering them with adhesive while visually observing them with a microscope. Therefore, there was a problem that assembly took time and cost increased.

Furthermore, since the lower magnetic head 7 and the upper magnetic head 13 have different support types, parts cannot be shared between the lower magnetic head device including the gimbal spring 6 and the upper magnetic head device including the plate 21. This resulted in an increase in parts costs.

Furthermore, it has been pointed out that since the shield plates 23 and 24 must be attached to the carriage 2 and the hold case 3 by molding or adhesion, respectively, it takes a long time to assemble and the magnetic head cannot be replaced.

This invention has been made in view of the above-mentioned state of the prior art, and its purpose is to enable common use of the upper magnetic head device and the lower magnetic head device, to simplify assembly and magnetic head replacement, and to reduce component costs and manufacturing. An object of the present invention is to provide a magnetic head device that can reduce costs.

[Means for solving problems]

In order to solve the problems faced by the prior art and achieve the above object, the present invention provides a head slider including a read/write core in which a read/write gap is formed, and a spring plate that elastically supports the head slider. , a shield plate for eliminating the influence of noise on the read/write core, and a magnetic head device that is mounted on a magnetic head support member and writes and/or reads information on a magnetic disk, the shield plate as described above. It has a structure in which a spring plate attachment part is provided.

[Effect]

According to the above means, the spring plate on which the magnetic head is mounted can be directly supported by the shield plate, and can be integrally attached to the magnetic head support member through the attachment portion formed on the shield plate. , the magnetic head, the spring plate, and the shield plate can be handled as one unit. This simplifies assembly. Furthermore, if the upper and lower magnetic heads are supported by spring plates, the unit can be used as the upper and lower magnetic head devices.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 to 4 are for explaining a magnetic head device according to an embodiment of the present invention, FIG. 1 is a perspective view of the magnetic head device showing a unit structure, and FIG. 2 is a magnetic head support member. 3 is a sectional view showing the unit structure of the magnetic head device, and FIG. 4 is a partial sectional view showing the state of both the upper and lower magnetic head devices during recording and reproduction. FIG.

In FIGS. 1 and 3, the magnetic head device 31 includes a head slider 33 holding a read/write core 32 and an erase core, a gimbal spring 34 as a spring plate that supports the head slider 33, and a gimbal spring 34 as a spring plate that supports the head slider 33. The first shield plate 35 located at the bottom in the figure
and a second shield plate 36 located above the gimbal spring 34 in the drawing.

The head slider 33 is made of ceramics, and has a read/write gap 37 and an erase gap 38 exposed on its surface.

The gimbal spring 34 that supports the head slider 32 is formed approximately in the shape of a disk as shown in FIG. It has a known structure. The attachment portion 34b on the outer edge of this gimbal spring 34 is
As shown in FIGS. 2 and 3, it extends at least to a flange portion 35a, which will be described later, of the first shield Vi, 35, and has a predetermined mounting hole 34c and positioning hole 34d.

The first shield plate 35 located on the side opposite to the head slider mounting side of the gimbal spring 34 is formed of a magnetic material into a cylindrical shape with a bottom, and has a flange 35a formed on the opening side.

As shown in FIGS. 1 and 2, mounting holes 35b and positioning holes 35c are alternately bored in this flange 35a. One pair of the positioning holes 35c are provided along a tangent to the rotational direction of the disk 5, and one of them is in the shape of a long hole.

The second shield plate 36 located on the head slider mounting side of the gimbal spring 34 has a truncated cone shape and is connected to the first shield plate 3.
A flange 36a having the same shape as the flange 35a is formed at the outer edge of the opening on the larger diameter side. A mounting hole 36b and a positioning hole 36c of the same shape are bored in the flange 36a at locations corresponding to the mounting hole 35b and positioning hole 35c of the flange 35a of the first shield plate 35.

A head slider insertion hole 36d, which is a through hole slightly larger than the outer diameter of the head slider 33, is provided on the small diameter side.
is drilled.

The shield plates 35, 36, the gimbal spring 34, and the head slider 33 are arranged so that the mounting portion 34b of the gimbal spring 34 is located on the flange 35a of the first shield plate 35, as shown in FIG. Slider 33
The head slider insertion hole 36d of the second shield plate 36
In addition, the flange 3 of the second shield plate 36
6a is placed on the mounting portion 34b of the gimbal spring 34. At this time, the flange 35 of the first shield plate 35
The mounting hole 35b and positioning hole 35c drilled in a are the mounting hole 34c and positioning hole 34d for the gimbal spring 34, and the mounting hole 3 for the second shield plate 36, respectively.
6b and the positioning hole 36C. Then, as shown in FIG. 4, it is attached using screws 39 in alignment with the mounting screw holes 2a, 3a formed in advance in the carriage 2 and hold case 3, respectively, and the positioning protrusions 2b, 3b. By forming it in this way, it becomes possible to attach it in an accurately positioned state using only the screws 39. At this time, the screw holes 2a and positioning protrusions 2b of the head slider 33 on the carriage 2 side, which corresponds to the lower head, and the hold case 3, which corresponds to the upper head.
The screw hole 3a of the head slider 33 on the side and the positioning protrusion 3
b are set in advance to be located at symmetrical positions, so when the magnetic head device 31 is attached to the carriage 2 and the hold case 3, the read/write gap 37 will be at a predetermined position shifted by 4 or 8 tracks. It will be located at the position of

Further, on the back side of the head mounting portion 34a of the gimbal spring 34, a flexible printed circuit board 40 is glued to connect lead wires led from the cores wound around the read/write core 32 and the erase core to the control circuit side. has been done. This flexible printed circuit board 40 is led out along the lower surface of the carriage 2 from a notch 35d formed in a part of the first shield plate 35. Naturally, this derivation path is on the upper surface side of the hold case 3 on the hold case 3 side.

Therefore, when configured as a double-sided head as in the conventional example, a protector is formed such that the second shield plate 36 surrounds the head slider 33. This protector prevents the head slider 33 from getting caught in the magnetic head insertion slot and damaging the gimbal spring 34 when the magnetic disk 5 is used for a so-called 5 or 25-inch disk in which the magnetic disk 5 is housed in a flexible case. In other types of magnetic head devices, it is not necessary to form the second shield plate 36 in such a shape. Needless to say, it is better to surround the head slider 33 including the core 32 and the erase core.

As described above, according to the above embodiment, (1) the gimbal spring 34 that supports the first shield plate 35 and the head slider 33 and the second shield plate 36 are integrated, and the carriage 2 and the hold case 3 are ■ At this time, the first shield plate 35, gimbal spring 34
and the second shield plate 36 can be easily attached using just the screws 39.
By extrapolating the positioning holes 35c, 34d, and 36c of the shield plate 35, gimbal spring 34, and second shield plate 36, positioning can be performed reliably, so that it does not take time to adjust when tightening the screws. The head slider 33 is
Since the slanted side surface of the truncated conical cylinder of the second shield plate 36 functions as a protector, it is necessary to provide a protector on the carriage 2 and the hold case 3. ■ It becomes possible to share the upper and lower magnetic head devices 31. ■ The above ■, ■, and ■ enable assembly at low cost. ■ The above ■, ■ make it possible to reduce component costs. There are various effects such as (1) the above-mentioned (2) makes it possible to easily replace the magnetic head device.

[Effects of the Invention] As is clear from the above description, according to the present invention, in which the spring plate supporting the head slider is directly supported by the shield, and is attached via the attachment part of the shield plate, both Since they can be handled as one unit, assembly and replacement of the magnetic head device are easy, reducing assembly costs. It is also possible to share the lower head and upper head, which also reduces component costs. .

[Brief explanation of the drawing]

1 to 4 are for explaining the present invention in detail. FIG. 1 is a perspective view of a magnetic head device showing the unit structure of the magnetic head device, and FIG. 2 is a magnetic head device attached to a hold case. 3 is a cross-sectional view showing the unit structure of the magnetic head device; FIG. 4 is a partial cross-sectional side view of the main portion showing the state of the upper and lower magnetic head devices during recording and reproduction; and FIG. The figure is a sectional view of a magnetic head assembly showing a conventional magnetic head device. 31... Magnetic head device, 32... Read/write core, 33... Head slider,
34... Gimbal spring, 34b... Mounting part, 35... First shield plate, 36...
...Second shield plate, 35a. 36 a -- flange, 34 c, 35 b, 36 b --
...Mounting holes, 34d, 35c, 36c...
...Positioning hole, 36d...Insertion hole. Figure 1 Figure 2 Figure 3 Figure 4

Claims (6)

[Claims] (1) A head slider including a read/write core with a read/write gap formed therein, a spring plate that elastically supports the head slider, and a shield plate for eliminating the influence of noise on the read/write core. , the magnetic head device is mounted on a magnetic head support member and writes and/or reads information on a magnetic disk, wherein the shield plate is provided with a mounting portion to which a spring plate is attached. head device. (2) In claim (1), the shield plate is formed into a bowl shape with a flange on the outer periphery, one side of the flange is attached to the attachment part of the spring plate, and the other side is attached to the magnetic head support member. A magnetic head device characterized in that the magnetic head device is formed as a mounted portion on a magnetic head device. (3) In claim (1), the first shield plate contacts the spring plate on the side opposite to the read/write gap formation side, and the second shield plate contacts the spring plate on the read/write gap formation side. What is claimed is: 1. A magnetic head device comprising a plate and a spring plate sandwiched between flanges of both shield plates. (4) In claim (3), the second shield plate is erected on at least both sides of the adjacent portion of the head slider in the radial direction of the magnetic disk, and has a downward slope with respect to the flange side of the shield plate. A magnetic head device characterized by having an inclined surface of. (5) Claim (3) states that the second shield plate is formed in the shape of a truncated conical cylinder, and that an insertion hole through which the head slider is inserted is formed in the end face on the smaller diameter side. Features of magnetic head device. (6) In claim (3), a positioning protrusion protruding from the magnetic head support member is inserted into the sandwiched portion of the spring plate of the flange of the first shield plate and the second shield plate. A magnetic head device characterized in that a positioning hole and a mounting hole into which a set screw is inserted are formed.