JPS628313A - Magnetic head - Google Patents

Abstract

PURPOSE:To facilitate an operation for connecting the terminals of a coil by providing an extension part to one end of a coil bobbin and providing a projecting part for fixing the terminals of the coil to the extension part. CONSTITUTION:The terminals 14a of the coil are drawn out onto the extension part 16 and are conducted along the inside of the projections 16, 16b from which the terminals are led across a window part 16a and are wound and fixed to the projections 16c. Two pieces of the terminals 14a of the coil are set to the prescribed positions in the above-mentioned manner. On the other hand, the projecting part 16d for positioning the coil bobbin to a circuit board is formed slender along the extension part 16a to one side edge of the extension part 16 toward the same direction. The terminals of the coil and a conductor pattern are thereby exactly positioned, by which the automation of the connection between both is made possible. The need for a post treatment is eliminated and the generation of a mis-connection or short circuit is obviated as well.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and more specifically, it has a coil bobbin fitted onto a magnetic core, and an electric circuit of a coil wound around the coil bobbin is connected to a circuit. The present invention relates to a magnetic head having a structure electrically connected to a terminal.

[Summary of the Disclosure] This specification and drawings describe a magnetic head that is attached to a magnetic core and includes a coil bobbin around which a coil is wound, and a circuit board that has a conductor pattern to which terminals of the coil of the coil bobbin are connected. An extension part is provided at one end of the coil bobbin, and the end of the coil is fixed to this extension part.
The present invention discloses a technique in which the terminal of the coil and the connection terminal of the conductor pattern can be accurately positioned simply by connecting the coil bobbin to the circuit board by providing a protrusion.

[Prior Art] Conventional magnetic heads of this type are used in magnetic disk devices that record and reproduce information on magnetic disks.

The conventional structure of a magnetic head having such a structure is shown in FIGS. 10 to 12.

The example shown in FIGS. 10 to 12 is a composite magnetic head in which a recording/reproducing head 1 and an erasing head 2 are arranged side by side.
The one indicated by 1 is the recording/reproducing gap, and the one indicated by G2 is the erasing gap.

The recording/reproducing head 1 is made of a high magnetic permeability material.
It is composed of third cores 11-13.

The first core 11 is a coil bobbin 1 as shown in FIG.
5 is fitted.

The coil bobbin 15 has a cylindrical portion 1 fitted into the first core 11.
5a, and flanges 15b integrally formed on both ends of the first core 11.
A through hole 15c is formed for fitting.

The coil 14 is wound around the cylindrical portion 15a of the coil bobbin 15.

Further, the second core 12 is butted against the first core 11 via the recording/reproducing gap G1, and is integrally joined.

The third core 13 has both ends connected to the first and second cores 11.
12, bridging both cores 11.12.

On the other hand, the erasing head 2 also has first to third cores 21 to 23, a coil bobbin 25 around which a coil 24 is wound is fitted to the first core 21, and the second core 22 is connected to the erasing gap G2. is joined to the first core 21 via the third core 2
3 are fixed on the rear ends of the first and second cores 21.22.

Then, the recording/reproducing head 1 and the erasing head 2 are inserted into the respective second cores 1 with a spacer plate 3 made of a non-magnetic material in between.
2.22 are butted and joined, recording/reproducing gap G
1 and the erase gap G2 are adjacent to each other with the spacing plate 3 and the second core 12.degree. 22 of each head in between.

On the other hand, what is indicated by reference numeral 5 is a circuit board on which a conductive pattern 4 is formed.

and the terminal 14a of said coil 14.24.

24a is electrically connected to the terminal portion 4a of the conductive pattern 4 by soldering or the like, and electrical signals of the respective coils are led out to an external circuit via the connecting portion 4b.

FIG. 12 explains the entire magnetic head. In FIG. 12, the reference numeral 6 is an elastic plate, which has large and small U-shaped openings 6a and 6b arranged opposite each other. At the portion sandwiched between the openings 6a and 6b, the coil bobbin 15.25 is fixed to the elastic plate via the slider 7, and the circuit board 5 is also fixed to the elastic plate.

A magnetic head having the structure described above has been used to perform recording, reproduction, and erasure on a magnetic disk.

[Problems to be Solved by the Invention] By the way, when the above-described structure is adopted, the terminals 14a and 24a of the coil are connected to the conductor pattern 4 on the circuit board 5.
In order to solder the terminal part 4a of the coil,
a, 24a must be positioned over the terminal portion 4a and brought into close contact.

However, the terminals 14a and 24a of the coil are usually very thin lead wires with a diameter of 0.02 mm to 0.05 mm, and there is a problem in that they are difficult to grasp and easily break when positioning them by grasping them with a bin set or the like.

Also, when soldering is done, the terminal 14a of the coil is used.

This method requires three simultaneous operations: fixing the soldering iron 24a, positioning the soldering iron, and supplying solder, which requires great skill and requires a large number of man-hours.

Furthermore, after soldering is completed, the terminal 14a of the coil,
In order to prevent the 24a from short-circuiting, a post-processing step of cutting off the excess terminal portion was also required.

Therefore, in an attempt to reduce and automate the above-mentioned large number of man-hours, a non-contact coil terminal connection method using a laser beam or the like has been proposed.

However, since the terminals 14a and 24a of the coil are extremely thin lead wires and the positions of the terminals are not regulated, the terminals 14a and 24a of the coil are automatically grabbed, positioned over the circuit terminal section 4a, and brought into close contact. , it was extremely difficult to connect automatically using a laser beam or the like.

[Means for solving the problems] In the present invention, in order to solve the problems related to -,
A magnetic head including a coil bobbin attached to a magnetic core and having a coil wound thereon, and a circuit board having a conductor pattern to which a terminal of the coil of the coil bobbin is connected, wherein an extension part is provided at one end of the coil bobbin, and the extension part is provided at one end of the coil bobbin. A structure is adopted in which a protrusion is provided at the end of the coil to secure the end of the coil.

[Function] By adopting a double-stranded structure, the extension of the coil bobbin can be connected to the circuit board, making it easier to connect the terminals of the coil.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

In some embodiments described below, parts that are the same as or correspond to the conventional structure are denoted by the same reference numerals.
The explanation will be omitted.

[First Embodiment] FIGS. 1 to 5 explain a first embodiment of the present invention. In this embodiment, as shown in FIG. A quadrilateral-shaped extension part 16 is provided by extending the .

This extension part 16 has a coil terminal 14a as described later.
A window portion 16a is formed to enable connection work using a means for connecting, for example, a soldering iron, a laser beam, or an ultrasonic vibrator.

Further, two positioning protrusions 16b are provided on the extension part 16 at a position closer to the coil pobbin 15 side by the window part 16a, and the window part 16a is provided opposite to these protrusions 16b.
A protrusion 16c for winding and positioning the end 14a of the coil is protrudingly provided on the side edge of the extension portion 16a on the opposite side from the protrusion 16b sandwiching the coil.

Then, the end 14a of the coil is pulled out onto the extension 16 and forms a protrusion 16b, as shown in FIG.

It is guided along the inside of 16b, traverses the window 16a, and is fixed by being wrapped around the protrusion 16c.

In this way, the ends 14a of the two coils are positioned at predetermined positions.

On the other hand, on one side edge of the extension part 16, a projection part 16d for positioning the coil bobbin with respect to the circuit board is formed to be elongated in the same direction as the projection 16b and along the extension part 16a.

On the other hand, FIG. 3 shows the circuit board 5 and the coil bobbin extension 1.
6 is shown.

In FIG. 3, the distance between the inner surface of the protrusion 16d and the terminal 14a of one coil is Pll, the terminals 14a, 14
The distance between a is P21, and straight lines 4La and 41b pass through the edge 5a of the circuit board 5, the position of the terminal portion 4a of the conductor pattern 4, and the center of a pair of terminal portions located closer to one side.
The distance between Pi2. P2
It is 2.

And Pi 1=P12. P21=P22.

Note that the spacer 8 provided on the back side of the end of the circuit board 5
is the extension 1 of the elastic plate 6 and the flange of the coil bobbin 15.
This is a member for adjusting the distance between 6 and 6.

Next, a connection method using a coil bobbin having the above-described structure will be explained with reference to FIG. 4.

First, as shown in FIG.
The coil bobbin is arranged so that the protrusion 16d of the extension part 16 is on the upper side and the protrusion 16d of the extension part 16 is on the lower side, and the inner edge of the protrusion 16d is brought into contact with the side edge 5a of the circuit board 5.

Then, the terminals 14a and 14b of the coil and the conductor pattern 4
Since the terminal portion 4a and the terminal portion 4a are in the positional relationship as described above, the terminal portion 14a exactly coincides with and overlaps the center of the terminal portion 4a.

In this state, the connecting portion 4b is irradiated with a laser beam 9a through the window portion 16a through the condensing lens 9, for example, to connect the end 14a of the coil to the conductor pattern.

In addition, in FIG. 4, the positioning in the front and rear direction is performed using the protrusion 16c.
and the position where the edge of the circuit board 5 contacts or the coil 14
This may be determined based on the position where the edge of the circuit board 5 contacts.

In this way, as shown in Figure 5, the assembly of the magnetic and bond parts is carried out, but since the coil bobbin and the circuit board side are accurately positioned, each core is fitted into the coil bobbin, and the elastic plate The work of fixing the coil bobbin and circuit board to 6 is extremely easy.

In the above-described embodiment, only the coil bobbin of one magnetic head is illustrated, but the coil bobbin of the other magnetic head may also have a completely similar structure.

In this way, a structure is adopted in which a protrusion for regulating the position of the end of the coil is provided on the extension part 16 side, and a protrusion protruding from the side edge of the extension part 16 for regulating the position between the circuit board side and the extension part. As a result, the end of the coil and the conductor pattern can be accurately positioned, the connection between the two can be automated, no post-processing is required, and no erroneous connections or short circuits occur.

The above-mentioned structure is applicable not only to composite magnetic heads but also to all magnetic heads that use a coil bobbin to extract the electric signal from the coil wound around the coil and connect it to a circuit terminal for connection to the outside. Can be applied.

・[Second Embodiment] FIG. 6 explains a second embodiment of the present invention. In this embodiment, a positioning protrusion 16e is provided on a part of the extension 16, and the circuit board is A positioning opening 5b into which the protrusion 16e, including the spacer 8, fits is formed on the 5 side.

When the protrusion 16e is fitted into the opening 5b, the dimensions of each part of the conductor pattern 4 are determined so that the terminal part 4a and the end 14a of the coil are accurately overlapped, so that the extension f! Accurate positioning can be achieved simply by connecting B16 and the circuit board 5 side.

Even if such a structure is adopted, the same effects as those of the above-mentioned embodiments can be obtained.

[Third Embodiment] FIG. 7 explains a third embodiment of the present invention. In this embodiment, the window 16a is a notch, one end of which is open, and the other parts are cut out. is the same as the first example,
Similar effects to those of the first embodiment can be obtained.

[Fourth Embodiment] FIG. 8 illustrates a fourth embodiment of the present invention. In this embodiment, notches 16f are provided on the left and right sides of the extension 16 to form a window. , the extension portion 16 is approximately H-shaped.

Even if such a structure is adopted, the same effects as in the embodiment described above can be obtained.

[Fifth Embodiment] FIG. 9 explains a fifth embodiment of the present invention. In this embodiment, the protrusion 16b protruding from the extension part 16 is not provided to protrude from the extension part. , a recess 16g is formed below the protrusion 16b so as to be flush with the extension 16.

Further, on the side edge of the extension portion 16 opposite to the coil bobbin, a V-shaped notch 16 for positioning is provided, facing the protrusion 16b.
h is formed.

Even if such a structure is adopted, the same effects as those of the above-mentioned embodiments can be obtained.

In addition, in the above-mentioned embodiment, only an example in which the bobbin and the extension part are integrally molded is shown, but the present invention is not limited to this, and it is possible to integrally mold separately molded parts by fitting or joining. It can also be adapted to cases where

[Effects] As is clear from the above description, according to the present invention, a magnetic head having a magnetic core to which a coil bobbin wound with a coil is attached, and a circuit board to which a terminal of the coil is connected is extended to one end of the coil bobbin. The extension part has a protrusion that fixes the end of the coil.
The coil terminals can be processed reliably, the coil terminals can be connected easily, and a highly reliable and inexpensive magnetic head can be provided.

[Brief explanation of the drawing]

1 to 5 illustrate the first embodiment of the present invention, in which FIG. 1 is a perspective view of a coil bobbin with a coil attached, FIG. 2 is a perspective view of the coil bobbin, and FIG. FIG. 4 is a perspective view showing the positional relationship between the coil bobbin and the circuit board, FIG. 4 is a perspective view illustrating the method of connecting the coils, FIG. 5 is a perspective view of the magnetic head installed, and FIG. 6 is a second embodiment of the present invention. FIG. 7 is an exploded perspective view explaining an example; FIG. 7 is a perspective view explaining a third embodiment of the present invention; FIG. 8 is a perspective view explaining a fourth embodiment of the present invention; FIG. 9 is a perspective view explaining the present invention. Figures 10 to 12 are perspective views for explaining the fifth embodiment of the present invention, and Figures 10 to 12 are for explaining the conventional structure. Figure 10 is a perspective view of the main parts, Figure 11 is a perspective view of the coil bobbin, and Figure 12 FIG. 2 is a perspective view of the magnetic head in an assembled state. 1... Recording/playback head 2... Erasing head 4...
・Conductor pattern 4a...Terminal part 5...Circuit board 5b...Opening part 6...Elastic board
14... Coil 14a... Coil terminal 15
...Coil pobbin 15b...Flange 16.
...Extension part 16a...Window part 16b, 16c.
・・Protrusions 16d, 16e・・・Protrusions 16d, 16e・・Protrusions coil q area
+S side Figure 1? 6a leaf coil nail ゛pin material Akebono ml Zuile≦denme? , Douban I Beginner QFil ``I +L e I:'y /l /l' (1! m
Fig. 9 15 Coil evaporator clearing L/1 coil ton-j Ie 1- Fig. 11

Claims (1)

[Claims] 1) A magnetic head including a coil bobbin attached to a magnetic core and having a coil wound thereon, and a circuit board having a conductor pattern to which terminals of the coil of the coil bobbin are connected, wherein one end of the coil bobbin 1. A magnetic head characterized in that an extension part is provided at the end of the magnetic head, and a protrusion part for fixing a terminal of a coil is provided to the extension part. 2) The magnetic head according to claim 1, wherein an opening is provided on the circuit board side into which a positioning projection protruding from the extension of the coil bobbin is fitted.