JPH0480445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a magnetic head incorporated in a magnetic recording device such as a VTR.

Conventional technology Magnetic heads used in VTRs generally have a pair of core blocks made of single-crystal ferrite, etc.
This magnetic head has a structure in which several or more turns of insulated copper wire or other wire are wound around a core chip that forms a magnetic gap and is integrated to form a magnetic circuit.This magnetic head is fixed to the head base. It is mounted on the rotating drum of a VTR, etc., with the wires attached.

A conventional example of the above-mentioned magnetic head will be explained with reference to FIGS. 4 and 5. In the figures, 1 is a head base which is a metal mounting board, and 2 is a core chip fixed to the front end of the surface of the head base 1. ,3
is a printed circuit board that is adhered and fixed to the back surface of the head base 1. The core chip 2 is made by integrally joining two core blocks 2a and 2b such that a winding insertion hole 4 is formed between them. Further, on the surface of the printed circuit board 3, a pair of conductive patterns 5,
5 is formed by adhesion. Reference numeral 6 denotes a wire rod which is wound in a predetermined rotation from one side of the pair of core blocks 2a, 2b of the core chip 2 to the other, respectively, and the winding start end and winding end end are soldered to the two conductive patterns 5, 5 of the printed circuit board 3, respectively. 7, 7 to be electrically and mechanically connected. In addition, 8 is a wire passing hole formed at the tip of the head base 1.
Pass the ends of the 6th turn of wire from the front side to the back side of the wire. Reference numeral 9 denotes a mounting hole formed in the center of the head base 1, which is used when the head base 1 is screwed to a rotating drum or the like.

Problems to be Solved by the Invention The magnetic head described above is manufactured through the steps of fixing the core chip 2 and printed circuit board 3 to the head base 1, and winding and soldering the wire 6 around the core chip 2. Since the winding around 2 and the soldering of wire 6 are done manually,
This work required a large number of man-hours, was inefficient, and resulted in high costs.

Means for Solving the Problems Means for solving the problems of the present invention is to provide a magnetic head with a core chip consisting of a pair of cores integrally joined so as to have a wire insertion hole between both core parts, and A pair of conductive patterns consisting of a predetermined number of conductive lands that cross the core part of the core block and one end of which is located in the wire insertion hole is formed on the surface to which the wire is pasted and fixed. A head base, which is a board on which a printed circuit board is adhered and fixed; and a wire rod which is wired to straddle the core part of the core chip using a wire bonding device, and which connects the predetermined number of conductive lands in series. This system automates the winding and soldering of the wire onto the core chip.

Embodiment FIG. 1 is a drawing showing a magnetic head according to the present invention. In the figure, 20 is a metal head base having a convex shape, and 21 is a printed circuit board fixedly attached to the surface of the head base 20. As shown in FIG. This printed circuit board 2
1 is the tip 20 of the head base 20.
It is formed to protrude slightly forward from point a.
A pair of conductive patterns 22 and 23 are formed on the surface of the printed circuit board 21, and a pair of conductive patterns 22 and 23 are formed on the top end 21a of the printed circuit board 21, as shown in the enlarged views of FIGS. conductive pattern 24,
25 is formed. Both conductive patterns 24,
25 is constituted by a predetermined number of conductive lands 24a, 25a arranged at a predetermined interval as shown in the figure. In FIG. 3, reference numeral 26 denotes a core chip that is adhered and fixed to the tip end 21a of the printed circuit board 21. As shown in FIG. This core chip 26 has a pair of cores 2
7 and 28, and when the pair of cores 27 and 28 are joined and integrated, the pair of cores 2
A wire insertion hole 29 is formed between the core leg portions 27a and 28a of the core legs 7 and 28. Furthermore, when the core chip 26 is attached and fixed to the tip end 21a of the printed circuit board 21, the core 27,
Each of the 28 core legs 27a, 28a intersects with a predetermined number of conductive lands 24a, 25a constituting each conductive pattern 24, 25, and the core chip 26
Each conductive land 24 is inserted into the wire insertion hole 29 formed in the
a, 25a are positioned so that the inner ends thereof are located.

Reference numeral 30 denotes a wire rod for connecting the conductive lands 24a, 25a constituting the conductive patterns 24, 25, respectively, and this wire rod 30 is connected to the core block 2.
The wires are wired so as to straddle the core leg portions 27a and 28a of No. 7 and 28, respectively. That is, the window-side end of any conductive land 24a and the outer end of the adjacent conductive land 24a are connected by one wire 30, and the core leg 27a is wound into a coil. The conductive patterns 22 and 23 and the conductive patterns 24 and 25 are connected in series by this wire 30.
Reference numeral 31 denotes a mounting hole formed in the center of the head base 20, which is used when the head base 20 is screwed to a rotating drum or the like.

To manufacture a magnetic head with the above configuration,
First, a printed circuit board 2 is placed on the surface of the head base 20.
1 is attached and fixed, and then a core chip 26 is attached and fixed to the tip end 21a of the printed circuit board 21 using an adhesive. At this time, the core legs 27a, 28a of the cores 27, 28 constituting the core chip 26 are
The inner end of each conductive land 24a, 25a crosses a predetermined number of conductive lands 24a, 25a constituting each conductive pattern 24, 25, and is positioned in a wire insertion hole 29 formed in the core chip 26. Keep it. In addition, the adhesive used is one with remarkable insulating properties, such as epoxy resin, which prevents the conductive lands 24a and 25a from being shot together, and at the same time prevents the printed circuit board 21 of the core chip 26.
This prevents the conductive lands 24a, 25a from being cut by the edges of the core chip 26 when bonding to the conductive lands 24a, 25a. Next, using a wire bonding device (not shown), wire rods 30 are used to bond each conductive land 24a, 2.
5a are connected to each other as shown. At this time, each wire 30 is connected to the core block 27, as shown in FIG.
28 core leg portions 27a, 28a, respectively. And this conductive pattern 24,
The conductive lands 24a, 25a and the wire 30 that make up the core block 25 have an effect equivalent to that of the wire conventionally wound around the outer periphery of the core block.
The conductive lands 22, 23 and the conductive patterns 24, 25 are connected in series using the wire 30, and the assembly of the magnetic head is completed.

Incidentally, in the above embodiment, the conductive pattern 24,
If the distance between the conductive lands 24a and 25a constituting the conductive lands 25 is narrowed on the inner side located in the wire insertion hole 29 of the core chip 26 and widened toward the outside, the distance between the conductive lands 24a, It is possible to reliably prevent the 25a from shooting each other. Also, the wire rods 3 of the core legs 27a, 28a of the core blocks 27, 28
If a glass material equivalent to the glass material coated on the tip surface of the core chip 26 is applied to the edge where the wire 30 contacts, the wire 30 will come into contact with this edge and the insulation will peel off, or in extreme cases, , the wire rod 30 can be prevented from being cut. Further, in the above embodiment, the printed circuit board 21 is attached and fixed on the head base 20.
An example has been described in which the conductive patterns 24 and 25 are formed on the tip end 21a of the conductive patterns 24 and 25.
The core chip 2 is mounted on the surface of a small printed circuit board 21 which has only the core chip 25 and has strength comparable to that of a head base.
6 is pasted and fixed, and these conductive patterns 24, 2
5 may be connected in series by a method similar to that described above using a wire bonding device and the wire 30. In this case, it is also possible to manufacture only the core chip 26 around which the wire 30 is wound.

Effects of the Invention As described above, the present invention provides a conductive pattern consisting of a predetermined number of conductive lands configured on a printed circuit board, and a conductive pattern that is wired so as to straddle the core portion of a core chip.
In addition, by using the wire for connecting the predetermined number of conductive lands in series, it is possible to have the same effect as the wire that was conventionally wound around the core chip. There is no need to insert wires into the window. Then, the wire rod wiring work can be performed using a wire bonding device. Therefore, the wire bonding technology can automate the work of winding the wire around the core chip, which has conventionally been done entirely by hand, thereby improving work efficiency and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a plan view of the magnetic head according to the present invention, FIG. 2 is an enlarged view of the tip of the printed circuit board, and FIG. 3 is an enlarged view of the tip of the magnetic head. FIG. 4 is a rear view of a conventional magnetic head, and FIG. 5 is a sectional view taken along the line A--A in FIG. 21... Printed circuit board, 24, 25... Conductive pattern, 24a, 25a... Conductive land, 26...
... Core chip, 27, 28 ... Core, 27a, 2
8a... Core leg portion, 29... Wire insertion hole, 30...
…wire.

Claims (1)

[Claims] 1. A core chip consisting of a pair of cores that are joined and integrated so as to have a wire insertion hole between both core parts, and a core chip that crosses the core leg part of the core and has one end on the surface to which the core chip is adhered and fixed. A printed circuit board comprising a pair of conductive patterns consisting of a predetermined number of conductive lands located in the wire insertion hole, a head base on which the printed circuit board is adhered and fixed, and a wire bonding device are used to form the core legs of the core chip. 1. A magnetic head comprising: a wire rod which is wired so as to straddle the conductive lands and connect the predetermined number of conductive lands in series.