JPS63140407A - Magnetic head - Google Patents

Abstract

PURPOSE:To maintain the fixed strength of a shielding member for a long period and to prevent omission by providing respectively a first engaging part at a supporting plate and a second engaging part at the shielding member, engaging these and fixing the shield member to the supporting plate. CONSTITUTION:At the edge end of a shielding plate 13, two slantingly facing rectangular projecting parts 13a are respectively formed in a single body. At a supporting plate 9, a slender rectangular hole 9a corresponding to the projecting parts 13a is formed. The shielding plate 13 is fitted into the outside so as to surround a sliding surface side part protruded from the supporting plate 9 of a magnetic head main body 1, fits and engages the projecting parts 13a into the hole 9a, is bonded with adhesives 14 together with the edge end part to connect to the supporting plate 9 and fixed to the supporting plate 9. Thus, the decrease in the fixed strength due to the aged deterioration of the adhesives 14 can be prevented and the omission of the shielding plate 13 due to the impact such as oscillation can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic head that records or reproduces information by sliding a magnetic core on a magnetic recording medium, and in particular, the present invention relates to a magnetic head that records or reproduces information by sliding a magnetic core on a magnetic recording medium. The present invention relates to a magnetic head that is swingably supported.

[Prior Art] As a magnetic head of this type, a catamaran type magnetic head is known for use in a magnetic disk device that records and reproduces information on both sides of a flexible magnetic disk, a so-called floppy disk, as a magnetic recording medium.

The conventional structure of this magnetic head will be explained with reference to FIG. 4 and subsequent figures.

Figure 4 shows a pair of catamaran type magnetic heads.
FIG. In FIG. 4, reference numeral 9 denotes an elastic support plate made of stainless steel or copper alloy, which is fixed to the tip of a support member provided on a magnetic helad carriage (not shown). A magnetic head main body 1 is supported on the support plate 9 so as to be swingable via the elasticity of the support plate 9.

Here, FIG. 4 shows the part of the magnetic head main body l on the side of the disk sliding contact surface (hereinafter abbreviated as 1 contact surface) that comes into sliding contact with the magnetic disk from the support plate 9, and is provided on the opposite side of the support plate 9. Illustrations and explanations of portions will be omitted.

The magnetic head body 1 includes a recording/reproducing core 2 formed in a thin plate shape.
A magnetic gap 2a is formed on the upper end surface of the recording/reproducing core 2 facing the sliding surface, and both sides of the magnetic gap 2a are sandwiched between reinforcing plates 10 and 10.

Further, the reference numerals 3.3 and 3.3 respectively indicate erasing cores, which are similarly formed into thin plate shapes, and have magnetic gaps 3a, 3a formed on their upper end faces facing the sliding surface, and a reinforcing plate 11 between them. is held in between. Erasing core 3.3 has an end face reinforced with plate 1
It is provided in parallel with the recording/reproducing core 2 so as to be butted against the end face of 0.10 mm.

The above recording/reproducing core 2 and erasing cores 3 and 3 are designated by reference numerals 4 and 5.
It is held between the sliders shown in . slider 4
．． 5 supports and reinforces both cores 2.3 above on a support plate 9, and also supports a floppy disk (not shown) and both cores 2.3.
This is to make the sliding contact in step 3 smooth. Slider 4.
5 is fixed by adhesive so as to sandwich reinforcing plates 10.10 on both sides of the recording/reproducing core 2 and the erasing core 3.3.

The slider 4 on one side is formed in the shape of a rectangular thick plate, and has a sliding surface 7 that is flush with both cores 2.3. The other slider 5 is formed in the shape of a rectangular parallelepiped block with a width larger than that of the slider 4, and similarly has a sliding surface 8 that is flush with both cores 2 and 3. On the side closer to both cores 2.3 from the center, a wide groove 6 is formed parallel to the cores. Therefore, when the entire magnetic head 1 is viewed as a blow, the recording/reproducing core 2 and the erasing core 3.3 are arranged at positions closer to one side than the center.

The magnetic head configured as shown in FIG. 4 performs recording and reproduction by pressing against the magnetic disk 12, which is a magnetic recording medium, from both sides as shown in FIG. 5 is the same magnetic head main body as shown in FIG. 4, and on the opposite side of the magnetic disk 12 there is a magnetic head main body 1' having exactly the same structure as the supporting plate 9'. placed above. The magnetic head main body l' has the same structure as the above-described magnetic head main body l, but the reference numerals of each part in the figure are distinguished by adding a dash.

As shown in the figure, the recording head main body 1.1' has a recording/reproducing core and an erasing core arranged at positions shifted to the left and right from the center position, and a track width of A is secured on both the front and back sides of the magnetic disk 12. is configured to do so.

While rotating the magnetic disk 12, the magnetic head bodies t and i
”, the respective recording/reproducing cores 2.2' and erasing cores 3.
Using each magnetic gap 3', information can be recorded, reproduced or erased by slidingly contacting tracks at different positions on both the upper and lower surfaces of the magnetic disk 12.

By the way, in addition to such a magnetic head structure, conventionally a shielding plate 13 as shown in FIG. 6 is often provided in order to shield the magnetic head main body l from external electromagnetic noise.

The shielding plate 13 is formed into a rectangular tube shape and is fitted on the outside of the magnetic head body 1 so as to surround the sliding surface side portion protruding from the support plate 9, and the edge portion in contact with the support plate 9 is coated with an adhesive 14.
It is fixed to the support plate 9 by adhering it to the support plate 9.

[Problems to be Solved by the Invention] However, with such a fixing structure of the shielding plate 13, the fixing strength of the shielding plate 13 decreases over time due to deterioration of the adhesive 14 over time, and the strength of the fixing of the shielding plate 13 decreases over time, resulting in damage due to shocks such as vibrations. There was a problem that the shielding plate 13 might fall off.

[Means for Solving the Problems] In order to solve these problems, according to the present invention, the magnetic head main body is swingably supported by an elastic support plate, and the magnetic head main body is attached to the support plate. In a magnetic head to which a shielding member is fixed for shielding from external noise, the support plate is provided with a first fitting portion or an engaging portion, and the shielding member is provided with a second fitting portion or engaging portion, the first and second
A structure is adopted in which the fitting portions or engaging portions of the shielding member are fitted or engaged with each other, and the shielding member is fixed to the support plate through this fitting or engagement.

[Function] According to such a structure, the fixing strength of the shielding member can be reinforced by using the above-mentioned fitting or engagement together with adhesion. Alternatively, the shielding member can be fixed only by the engagement structure. The fitting portion or the engaging portion does not deteriorate over time unlike adhesives, so it can maintain its fixing strength.

[Example] Hereinafter, details of an example of the present invention will be described with reference to FIGS. 1(A), (B) to FIG. 3. In this example, a catamaran type magnetic head for a magnetic disk device of the same type as the conventional example described above is used as an example, and in these figures, parts that are the same as or equivalent to those in FIGS. 4 to 6 of the conventional example are indicated. The same reference numerals are given, and explanations of the same parts will be omitted.

Figures 1A and 1B show the structure of a magnetic head according to a first embodiment of the present invention.

The head of this embodiment differs from the conventional example in the structure in which the shield plate 13 for shielding the magnetic head main body l from external noise is fixed to the support plate 9 as described below.

As shown in FIGS. 1A and 1B, rectangular convex portions 13a are provided near two diagonally opposing corners of the edge of the shielding plate 13 on the supporting plate 9 side.

13a (only one is shown in FIG. 1(A)) is the shielding plate 13
is integrally formed.

Further, in the support plate 9, there are elongated rectangular holes 9a at positions corresponding to the convex portions 13a, 13a.

9a (only one is shown).

As shown in both figures, the shielding plate 13 is fitted to the outside so as to surround the sliding surface side portion of the magnetic head main body 1 that protrudes from the support plate 9, and the convex portions 13a, 13a are inserted into the holes 9a, 9a.
The projecting portions 13a, 13a and the fitting portions of the convex portions 13a and 13a are bonded together with the adhesive 14 together with the edge portions in contact with the support plate 9 to be fixed to the support plate 9.

According to such a fixing structure of the shielding plate 13, the adhesive 14
The fixing strength is increased by the convex parts 13a, 13a and the holes 9a, 9a.
It is possible to prevent the fixing strength from decreasing due to deterioration of the adhesive 14 over time, and to prevent the shielding plate 13 from falling off due to shocks such as vibrations.

1111 Figures 2(A) and CB) show a second embodiment of the present invention in which the convex portions 13a, 13a of the shielding plate 13 of the first embodiment described above are modified.

In this embodiment, the convex portions 13a, 13a are bent into a V shape,
It has elasticity and is bent and press-fitted into the holes 9a, 9a, returns to its original shape on the back side of the support plate 9, and its tip engages with the back side of the support plate 9. Convex portions 13a, 13a
may be straight, inserted into the holes 9a, 9a, bent, and engaged with the back surface of the support plate 9. By engaging the protrusions 13a, 13a with the support plate 9, the shield plate 13 is fixed to the support plate 9.

According to such a structure, the shielding plate 13 is fixed by the engagement structure without using adhesive, and the engagement part does not deteriorate over time unlike in the case of adhesive, so that the fixing strength does not decrease over time. Therefore, the shielding plate 13 can be prevented from falling off.

Of course, the shielding plate 13 may be fixed by using such an engagement structure and adhesive in combination.

After shaving, FIG. 3 shows a fixing structure for the shielding plate 13 according to a third embodiment of the present invention as another modification of the first embodiment. The back side of plate 9 is shown.

In this case, the convex portions 13a, 13a of the support plate 13 are formed in an L-shape, and the long side portion of the L-shape is bent outward in the central portion.

The convex portions 13a, 13a are attached to the back core portion 1 on the support plate 9.
The distal end portion, which is bent outward, engages with the back surface of the support plate 9. This engagement fixes the shielding plate 13 and provides the same effect as the second embodiment.

In this way, various fixing structures for the shielding plate 13 via the fitting or engagement structure can be considered, and are not limited to those described above. It goes without saying that the plate 9 may be provided with a protrusion, and the number of protrusions and holes or notches is not limited to two, but may be more than two.

[Effects of the Invention] As is clear from the above description, according to the present invention, the magnetic head main body is swingably supported by an elastic support plate, and the magnetic head main body is shielded from external noise by the support plate. In a magnetic head to which a shielding member is fixed, the supporting plate is provided with a first fitting portion or an engaging portion, and the shielding member is provided with a second fitting portion or engaging portion, and the first and second fitting portions are provided. 2
Since the fitting portions or engaging portions of the shielding member are fitted or engaged with each other, and the shielding member is fixed to the support plate through this fitting or engagement, the structure is extremely simple and can be implemented at low cost. This makes it possible to maintain the fixing strength of the shielding member over a long period of time and prevent the shielding member from falling off, thereby improving the durability and reliability of the magnetic head.

[Brief explanation of the drawing]

1(A) and CB) are respectively a perspective view and a sectional view illustrating a magnetic head shielding plate fixing structure according to a first embodiment of the present invention, and FIGS. A perspective view and a sectional view of a magnetic head according to an example, FIG.
FIG. 4 is a perspective view of the main part of the magnetic head according to the embodiment, FIG. 4 is a perspective view of a conventional magnetic head, FIG. 5 is a sectional view illustrating the recording and regeneration operation of the same head, and FIG. 6 is a conventional magnetic head with a shielding plate. FIG. 1...Magnetic head body 2...Recording/reproducing core 3...
・Erase core 4, 5...Slider 9...Support plate 9a...Hole 9C...Notch 1
3...Shielding plate 13a...Convex part/Work - No. 33 Book 8 Core Figure 1 (A) Yo; 1st (Sunday) To, l'? , To Magnetism - IF'OJ, t- 〆1 2nd day (B) 2 customers Otsu Shoki j! Tadako No. 50

Claims (1)

[Claims] In a magnetic head in which a magnetic head main body is swingably supported by an elastic support plate, and a shielding member for shielding the magnetic head main body from external noise is fixed to the support plate, a first fitting to the support plate is provided. A second fitting portion or engaging portion is provided on the shielding member, and the first and second fitting portions or engaging portions are fitted or engaged with each other. A magnetic head characterized in that the shielding member is fixed to the support plate through matching or engagement.