JPH0573831A - Magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] In a magnetic head in which a back core is joined to form one or more magnetic cores, each core is reliably grounded, and the number of man-hours for applying a conductive adhesive is reduced. In addition, a magnetic head structure capable of preventing the occurrence of defective conduction due to cracks and the like is provided. [Structure] Therefore, each terminal 9d / 12 made of a conductor implanted in the recording / reproducing / erasing coil bobbin 9/12
d and the core are configured to be electrically conductive by the conductive adhesive 22, and further, the terminal holding portions 9c / 12c of the terminals 9d / 12d of the coil bobbin 9/12 to be electrically conductive,
Notch 9e / 12e for pouring the conductive adhesive 22
Was established.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly to a magnetic head for recording / reproducing information on / from a magnetic disk as a magnetic recording medium.

[0002]

2. Description of the Related Art FIGS. 6 to 9 are structural explanatory views of an example of a conventional magnetic head used in a floppy disk drive for recording and reproducing information on a floppy disk of a magnetic recording medium. Indicates. Figure 6
FIG. 7 is an exploded perspective view of the magnetic head body, and FIG. 7 is a rear perspective view of the assembly. Reference numeral 1 denotes a core assembly, which is configured as a combined body in which a recording / reproducing core (recording / reproducing magnetic circuit) 2 and an erasing core (erasing magnetic circuit) 4 are joined via a spacing plate 6.

The recording / reproducing core 2 is formed by joining a T-shaped first core 2a and an I-shaped second core 2b through a recording / reproducing gap 3 and further at the rear end portions of the cores 2a and 2b. ,
A back core 15, which is a third core for magnetically connecting these, is joined and configured. Further, the erase core 4 joins the T-shaped first core 4a and the I-shaped second core 4b through the erase gap 5, and further, the cores 4a, 4 are joined together.
The back core 16 which is the third core is joined to the rear end portion of b.

However, the recording / reproducing core 2 and the erasing core 4 are joined to each other as a core assembly 1 via a spacing plate 6 before the back cores 15 and 16 are joined.
Non-magnetic sliders 7 and 8 are bonded to both sides of the slider by an adhesive or glass welding. After this joining, the coil bobbin 9 in which the recording / reproducing coil 10 is wound around each of the first cores 2a and 4a of the core assembly 1 and the coil bobbin 12 in which the erasing coil 13 is wound around.
And then the back cores 15 and 16 joined together via the spacing plate 17 are bonded by adhesive to form the magnetic head main body 18 shown in FIG. Each of the coil bobbins 9 and 12 is provided with flanges 9b and 12b for restricting the winding width of the coils 10 and 13 at both ends of a rectangular tubular body having holes 9a and 12a, respectively. Each of the terminal holding portions 9c, 12c is formed at one end of each of the terminals 9b, 12b, and a plurality of terminals 9d, 12d made of a conductor are planted therein. Then, the coil terminals 10a and 13a after winding the coil are wound around the terminals 9d and 12d a plurality of times for soldering.

FIG. 8 is a rear perspective view of an example of a conventional magnetic head in which the magnetic head body 18 is positioned and fixed on a support plate 19. Each back core 1 is provided on the support plate 19.
Each terminal 9d, 12 is continuous with the hole portion 19a where 5 and 16 are exposed.
An escape hole 19b of d is formed, and the terminals 9d and 12d of the coil bobbins 9 and 12 pass through the escape hole 19b and the rear surface of the support plate 19 (the sliding surface of the magnetic head body 1 is arranged. The opposite side). After that, the printed circuit board 20 is adhered to the support plate 19 with a double-sided adhesive tape or the like. As shown in FIG. 9 which is a rear perspective view of the next step of FIG. 8, a plurality of connecting portions 20a are arranged on the printed circuit board 20 at positions corresponding to the terminals 9d and 12d, respectively, and the connecting portions 20a are connected to the connecting portions 20a. Has a hole 20b through which the terminals 9d and 12d are inserted, and the magnetic head 21 is configured by connecting the terminals 9d and 12d and the connecting portion 20a by soldering S or the like.

[0006]

In the magnetic head 21 of the above structure example, when the cores 2/4, 15/16, etc. are charged,
Since a noise pulse is generated at the time of reproducing recorded information, which causes an error, it is necessary to connect the core 2 to the GND (ground) terminal. Therefore, conventionally, the head body 18
After bonding to the support plate 19, each core 2a / 2b, 4a / 4
b and 15/16 are electrically connected to the support plate 19 by the conductive adhesive 22. Further, the printed board 20 is attached to the support plate 1
After adhering to No. 9, the core terminals were connected to the GND terminals again by electrically connecting the GND terminals of the support plate 19 and the printed circuit board 20 with a conductive adhesive.

However, in the conventional method as described above, the conductive adhesive 22 must be applied and cured twice or more as described above, and the support plate 19 and the printed circuit board 20 must be connected together. Conduction failure easily occurs due to the occurrence of cracks in the conductive adhesive portion for conduction,
It was not stable in terms of environmental reliability. The present invention has been made in view of the above problems of the conventional magnetic head structure of this kind, and the core is surely grounded, and the conductive adhesive portion may be cracked or the like. The purpose of the present invention is to provide an assembling construction means that does not include

[0008]

Therefore, according to the present invention, in a magnetic head in which a back core is joined to form one or a plurality of magnetic cores, a terminal made of a conductor embedded in a coil bobbin is provided. The core is configured to be electrically conductive with an electrically conductive adhesive, and the terminal holding portion of the terminal of the coil bobbin is provided with a notch for pouring the electrically conductive adhesive to achieve the above object. To do.

[0009]

[Function] With the configuration of the present invention as described above, it is only necessary to apply and cure the conductive adhesive once, and there is no possibility of conduction failure due to cracks or the like in the conductive adhesive portion, which is environmentally friendly. It is possible to manufacture a stable magnetic head. Further, in that case, workability and reliability can be improved by providing the notch for pouring the conductive adhesive in the terminal holding portion of the terminal to be electrically connected to the core.

[0010]

EXAMPLES The present invention will be described below based on examples. It should be noted that the same or corresponding constituent elements as those in FIGS. 6 to 9 of the conventional example are represented by the same reference numerals, and the duplicated description of each element is omitted.

(First Embodiment) FIGS. 1 to 3 are explanatory views of a first embodiment of a magnetic head according to the present invention. FIG. 1 is a rear view of the magnetic head body, and FIG. 2 is a perspective view of an erasing coil bobbin assembly. Of the three terminals 12d made of the conductor of the coil bobbin 12 around which the erasing coil 13 is wound,
As shown in FIG. 7, one central terminal which has not been used conventionally is electrically connected to the rear end 4a of the erasing core 4 by a conductive adhesive 22. Other cores 2a / 2b, 4a / 4
Since all of c and 15/16 are also electrically connected by the conductive adhesive 22, all the cores are electrically connected to one of the terminals 12d. At this time, as shown in FIG. 2, the workability can be improved by providing the notch 12e in the terminal holding portion 12c of the terminal to be conducted.

After that, positioning / adhesion fixing is performed on the support plate 19, and the printed circuit board 20 is attached. And FIG.
As shown in the rear view of this magnetic head, the terminals and the printed circuit board connecting portion 20a are soldered S like other terminals.
The magnetic head 21 is formed by connecting the magnetic head 21 and the like. By adopting such a configuration, the following effects can be obtained: 1) The work time can be shortened because the conductive adhesive 22 need only be applied and cured once, and 2) the support plate 19 and the printed circuit board 20 can be obtained. The yield is improved by eliminating the conduction failure due to the crack of the conductive adhesive portion 22 for conducting the data. 3) The recording / reproducing coil bobbin 9 and the erasing coil bobbin 1
Reduction of the number of parts by common use with 2, 4) Improvement of reliability by eliminating support plate holes for electrically connecting the core and the support plate 19.

(Second Embodiment) FIG. 4 is a rear view of the magnetic head body of the second embodiment. Each coil bobbin 9/12
Terminals 9d / 12d array of back core 15/1
By making it parallel to 6, it is possible to easily use any terminal as a GND terminal, handle any wiring of the printed circuit board 20, and manufacture a magnetic head having the same effect as that of the first embodiment. can do.

(Third Embodiment) FIG. 5 shows a rear view of the magnetic head body of the third embodiment. In the magnetic head having only the recording / reproducing core 2 without the erasing core 4 as shown in the figure, one additional terminal 9d of the coil bobbin 9 is added to the magnetic head to achieve the same effect as that of the first embodiment. A magnetic head can be manufactured.

[0015]

As described above, according to the present invention,
In a magnetic head in which a back core is joined to form one or a plurality of magnetic cores, a terminal made of a conductor embedded in a coil bobbin and a core are electrically connected to each other so that a GND terminal between the core and a printed circuit board is electrically connected. By doing so, it is possible to reduce the work process and improve the yield, and at that time, by providing a notch for pouring the conductive adhesive in the terminal holding portion of the terminal that is desired to be electrically connected to the core, workability and The reliability can be further improved.

[Brief description of drawings]

FIG. 1 is a rear view of a magnetic head body according to a first embodiment.

FIG. 2 is an assembly diagram of the erasing coil bobbin of FIG.

FIG. 3 is a rear view of the magnetic head of the first embodiment.

FIG. 4 is a rear view of the magnetic head body of the second embodiment.

FIG. 5 is a rear view of the magnetic head body according to the third embodiment.

FIG. 6 is an exploded perspective view of an example of a conventional magnetic head.

7 is a rear perspective view of the assembly of FIG.

FIG. 8 is a rear perspective view of an example of a conventional magnetic head.

9 is a rear perspective view showing the next step of FIG.

[Explanation of symbols]

 2 recording / reproducing core 4 erasing core 9,12 coil bobbin 9d, 12d terminal 12c terminal holding part 12e notch 15,16 back core 18 magnetic head main body 19 support plate 20 printed board 21 magnetic head 22 conductive adhesive

Claims (2)

[Claims] 1. A magnetic head comprising a back core joined to form one or a plurality of magnetic cores, wherein a terminal made of a conductor embedded in a coil bobbin and the core are electrically connected by a conductive adhesive. Magnetic head. 2. The magnetic head according to claim 1, wherein the terminal holding portion of the terminal of the coil bobbin is provided with a notch for pouring the conductive adhesive.