JP2001006113A - Magnetic head apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable electrical connection and realize reduction in size without giving adverse influence on a core chip or the like. SOLUTION: A core chip 4 where a coil 3 is wound around a magnetic core 2 having a magnetic gap 1 and a head base 8 including a first electrode 5 electrically connected to the coil 3 of the core chip 4 and a second electrode 7 coupled with the first electrode 5 via the wiring 6 are provided and the wiring 6 is formed narrower then the first electrode 5 and second electrode 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device having a core chip mounted on a head base, and more particularly to a magnetic head device for electrically connecting a coil of the core chip to the head base.

[0002]

2. Description of the Related Art For example, in a rotary drum type video head used in a video deck, a plurality of magnetic head devices are mounted on a rotating drum. Each magnetic head device includes a core chip having a magnetic core and a coil, and a head base supporting the core chip. FIG. 3 shows a conventional magnetic head device. In the magnetic head device shown in FIG. 3, a core chip 101 is provided at one end of a head base 100. This core chip 101
It has a magnetic core 102 and a coil 103 wound around the magnetic core 102. A pair of lead wires 104 extends from the coil 103.

The head base 100 has a wiring pattern 105 formed on one main surface. A pair of leads 104 derived from the coil 103 are electrically connected to the wiring pattern 105. The wiring pattern 105 includes a rotary transformer (not shown).
And a pair of electrodes 106 for connection to the electrodes.
That is, the pair of electrodes 106 and the rotary transformer are electrically connected via the relay terminal 107.
Further, terminal pins 108 derived from the relay terminals 107 are soldered to the pair of electrodes 106. Therefore, the coil 103 of the core chip has the wiring pattern 1
05 and the terminal pin 108 to be electrically connected to the relay terminal 107.

[0004]

By the way, in the magnetic head device as described above, a predetermined wiring pattern 1 is required.
05 and a pair of lead wires 104 and terminal pins 108
Are connected by solder or the like. Therefore, in the conventional magnetic head device, when solder is used, the wiring pattern 10
5, there is a problem in that heat is transmitted through the core chip 5 and adversely affects the core chip 101 or the relay terminal 107.

Accordingly, the present invention has been devised in view of the above-described conventional circumstances, and has been developed to realize an electric connection without adversely affecting a core chip and the like, and to realize a compact magnetic device. It is an object to provide a head device.

[0006]

A magnetic head device according to the present invention that has achieved the above-mentioned object has a core chip in which a coil is wound around a magnetic core having a magnetic gap, and is electrically connected to the coil of the core chip. A first electrode to be formed, and a head base having a second electrode connected to the first electrode via a wiring, wherein the wiring is compared with the first electrode and the second electrode. The width is narrowed.

In the magnetic head device according to the present invention configured as described above, the wiring is narrower than the first electrode and the second electrode. Heat applied to the electrodes is prevented from affecting the second electrode and the first electrode via the wiring.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a magnetic head device according to the present invention will be described below in detail with reference to the drawings.

A magnetic head device shown as an embodiment is
As shown in FIG. 1, a magnetic core 2 having a magnetic gap 1
A core chip 4 having a coil 3 wound thereon, a first electrode 5 electrically connected to the coil 3 of the core chip 4, and a second electrode 7 connected to the first electrode 5 via a wiring 6.
And a head base 8 having: In this magnetic head device, the head base 8 is fixed to a rotating drum (not shown). In this magnetic head device, a pair of first electrodes 5 are provided to be separated from left and right so as to be connected to both ends of the coil 3. Therefore,
A pair of second electrodes 7 is provided corresponding to the pair of first electrodes 5.

In this magnetic head device, the first
The electrode 5, the wiring 6, and the second electrode 7 are formed by attaching a so-called flexible printed wiring board to the head base 8. In other words, a flexible printed wiring board formed by printing the first electrode 5, the wiring 6, and the second electrode 7 is attached to the head base 8.

Further, in this magnetic head device, the wiring 6 is narrower than the first electrode 5 and the second electrode 7. In other words, the first electrode 5 and the second electrode 6 are connected by the narrow wiring 6.

Further, in this magnetic head device, a pair of first electrodes 5 are provided at a substantially central portion of the head base 8 so as to be separated from each other. On the other hand, the pair of second electrodes 7 are disposed separately at the left and right ends of the head base 8.

In this magnetic head device, a rotary transformer (not shown) incorporated in the rotary drum.
Are electrically connected to each other via a lead wire 10. These lead wires 10 are connected to a pair of second
Is soldered to the electrode 7 of the first embodiment. As a result, the rotary transformer is electrically connected to the magnetic head device. In other words, the rotary transformer includes the lead wire 10, the second electrode 7, the wiring 6, and the first
And the coil 3 of the core chip 4 via the electrode 5.

In the magnetic head device configured as described above, both ends of the coil 3 and the first electrode are connected to the lead wire 10.
The second electrode 7 is electrically connected to the second electrode 7 by soldering. In general, at the time of soldering, a molten solder material is adhered, so that the temperature of the soldered portion becomes high. However, in the above-described magnetic head device,
Since the width of the wiring 6 between the first electrode 5 and the second electrode 7 is narrow, the influence of heat generated at the time of soldering can be suppressed. More specifically, when the first electrode is soldered to both ends of the coil, since the thermal resistance of the wiring 6 is large, the influence of heat on the rotary transformer via the second electrode is prevented. I do. Further, when the second electrode 7 and the lead wire 10 are soldered, the influence of heat on the core chip 4 via the first electrode due to the large thermal resistance of the wiring 6 is prevented.

Therefore, in this magnetic head device, the operations of the rotary transformer, the core chip, and the like are stabilized, and excellent performance can be maintained. Further, in the magnetic head device, since the influence of heat can be prevented as described above, it is not necessary to take a method of lengthening the distance of the wiring 6 to eliminate the effect of heat. In other words, in this magnetic head device, the wiring 6 may be short. Therefore, in the magnetic head device, the size of the printed wiring board 9 can be reduced, so that the size can be significantly reduced, and the cost can be reduced.

The magnetic head device according to the present invention is not limited to the one shown in FIG. 1, but may be one having a pair of core chips 20a and 20b as shown in FIG.

The magnetic head device shown in FIG. 2 has a pair of core chips 20a and 20b each having a coil 3.
And a first electrode 5 and a first electrode 5 connected to the respective coils 3 of the pair of core chips 20a and 20b.
And a head base 8 having a second electrode 7 connected via a wiring 6. In this magnetic head device,
Since it has a pair of core chips 20a and 20b, it has four first electrodes 5 and four second electrodes 7. A rotary transformer is connected to each of the four second electrodes 7 via a lead wire 10.

Also in this magnetic head device, since the width of the wiring 6 between the first electrode 5 and the second electrode 7 is narrow, the distance between the first electrode 5 and the second electrode 7 is small. Can suppress each other's influence of heat. Therefore, even in this magnetic head device, the operations of the rotary transformer, the core chip, and the like are stable, and excellent performance can be maintained.
Further, in this magnetic head device, since the influence of heat can be prevented as described above, the size of the printed wiring board 9 can be reduced, the size can be significantly reduced, and the cost can be reduced. be able to.

[0019]

As described above in detail, in the magnetic head device according to the present invention, the wiring is narrower than the first electrode and the second electrode. Is prevented from affecting the second electrode and the first electrode via the wiring. Therefore, according to the present invention, it is possible to provide a magnetic head device that enables electrical connection without adversely affecting a core chip and the like and that is reduced in size.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a magnetic head device shown as an example of the present invention.

FIG. 2 is a plan view of a main part of a magnetic head device shown as another example of the present invention.

FIG. 3 is a perspective view of a main part of a conventional magnetic head device.

[Explanation of symbols]

 Reference Signs List 1 magnetic gap 2 magnetic core 3 coil 4 core chip 5 first electrode 6 wiring 7 second electrode 8 head base 9 printed wiring board 10 lead wire

Claims (2)

[Claims] A core chip having a coil wound around a magnetic core having a magnetic gap; a first electrode electrically connected to a coil of the core chip; and a first electrode connected to the first electrode via a wiring. A magnetic head device, comprising: a second electrode formed on the substrate; and a head base having the second electrode, wherein the wiring is narrower than the first electrode and the second electrode. 2. The coil according to claim 1, wherein both ends of the coil are connected to different first electrodes.
The magnetic head device according to the above.