JPS6317057Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a VTR (video tape recorder).
The present invention relates to the structure of a magnetic head for use in applications.

Conventional VTR magnetic heads are shown in Figures 1 to 3.
As shown in the figure, a protrusion 1a of a metal support base 1
A video head chip 2 is adhesively fixed to the video head chip 2, and a lead wire 3a of a coil 3 wound around the video head chip 2 is guided to the opposite surface of the support base 1 by passing through the through hole 1c.

On the other hand, the video head chip 2 on the support base 1b
The lead wire 3 of the coil 3 is placed on the opposite side to the mounting side of the coil 3.
A relay terminal board 8 is adhesively fixed to relay the terminal a to a lead wire 7 from an amplifier (not shown) via the terminal 4, the conductive pattern 5, and the terminal 6, and the lead wire 3 of the coil 3
a and the portion along it are covered with a protective resin adhesive 9 as shown by the broken line.

However, in the structure of such a conventional VTR magnetic head, the lead wire 3a of the coil 3
Since it passes through the through hole 1c of the support base 1 and is guided to the opposite surface, there is a lot of bending and it is easily damaged during the pulling operation. In particular, the end face of the through hole 1c is sharp and prone to burrs, etc., and since the support base 1 is made of metal, there is a risk of grounding if the coating of the coil lead wire 3a is damaged. .

In order to prevent this, it is necessary to chamfer the end face of the through hole 1c, which not only increases the number of machining steps and production costs, but even if such a measure is taken, the grounding still occurs. It was difficult to eliminate all risks.

Therefore, as seen in, for example, Japanese Utility Model Application Publication No. 55-144626, the terminal 4 of the relay terminal board 8 is inserted through the through hole 1c.
It may be possible to install the relay terminal board 8 in a position where the lead wire 3a leading to the through hole 1c is avoided from touching the edge of the through hole 1c, but if this is done, the problem arises that the mounting position of the relay terminal board is greatly restricted. .

Also, even if you do this, the tip of the leader wire 3a must be soldered to the terminal 4 of the relay terminal board 8 on the side of the support base 1 opposite to the side where the video head chip 2 is attached. During the work, the support base 1 had to be turned over, which caused the problem of poor workability.

Furthermore, since the lead wire 3a that has been drawn around has many exposed parts, this part should be protected, and the through hole 1c should be protected.
A large amount of resin adhesive was required to fix the coil lead wire inside, and this resin sometimes flowed out along the surface of the support base 1.

This idea was made in view of the above points,
It is an object of the present invention to provide a magnetic head for a VTR that is free from the risk of damaging the lead wire of a coil and has good workability.

Therefore, in the VTR magnetic head according to this invention, two grooves are provided on the relay terminal board side of the protruding part of the metal support base on which the video head chip is attached, and two grooves of the coil wound around the head chip are inserted into the grooves. The position and width of the groove should be adjusted so that when the leader wire is inserted and connected to each terminal of the relay terminal board, each leader wire does not come into contact with either the sides or the bottom of the groove.
The conventional problems are solved by setting the depth and depth.

Embodiments of this invention will be described below with reference to FIGS. 4 to 6 of the accompanying drawings.
Parts that are the same as those in the figures are given the same reference numerals, and explanations of those parts will be omitted.

Two grooves 1d were provided on the side of the relay terminal plate 8 of the protrusion 1a of the support base 1, and the two lead wires 3a of the coil 3 were inserted into the grooves 1d and connected to the terminals 4 of the relay terminal plate 8. At this time, the position, width, and depth of the groove 1d are determined so that the leader line 3a does not come into contact with either the side surfaces or the bottom surface of the groove 1d.

Furthermore, a protrusion 1e for preventing the resin adhesive from flowing out is provided on the video head chip 2 side of the protrusion 1a of the support base 1.

When assembling the VTR magnetic head having such a configuration, the video head chip 2 is attached to the flat surface of the protrusion 1a of the support base 1 with adhesive, and the base 1b of the support base 1 is attached to the video head chip 2. After adhering the relay terminal plate 8 to the side opposite to the mounting side of the video head chip 2, guiding the lead wire 3a of the coil 3 through the groove 1d without contact, and soldering its tip to the terminal 4. The exposed portion of this leader line 3a and the portion along it are covered with protective resin adhesives 9a and 9b, respectively, as shown by broken lines in FIG.

According to such a configuration, the leader wire 3 of the coil 3
A is less likely to be damaged because it is less likely to be bent or refracted, and there are few exposed parts, and since it does not come into contact with the metal support 1, there is no risk of the coating being damaged due to sharp edges or burrs, etc., and causing it to ground. There is no need for chamfering or deburring around the groove 1d.

Further, the winding of the coil 3, the treatment of the lead wire 3a, and the soldering to the relay terminal plate 8 can be performed from the same side, and there is no need to insert through holes, so that work efficiency is significantly improved.

Furthermore, since the resin adhesive for protecting the leader line 3a is dripped onto the upper part of the groove 1d and diffuses downward, effective covering and fixing can be achieved with a small amount, and protrusion can be kept to a minimum. be able to. Further, since the resin adhesive for protecting the video head chip 2 is prevented from flowing out by the protrusion 1e, there is no risk of it flowing out along the support base 1.

As described above, according to this invention, a groove is provided in the protruding part of the support base to guide the lead wire of the coil wound around the video head chip to the relay terminal board without contact, so that the lead wire can be easily routed and exposed. There are only a few parts required, and damage can be prevented, and there is no risk of contacting the end face of the support base, causing damage, or grounding.

In addition, all coil lead wires can be processed from only one side of the support base, and the mounting position of the relay terminal board is not so strictly restricted, so the work efficiency of assembly processing is significantly improved. It has excellent effects such as

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a conventional magnetic head for a VTR, FIG. 2 is a perspective view of the main parts showing the relay terminal board side, and FIG. 3 is a main part showing the video head chip side. FIG. FIG. 4 is a side view showing an embodiment of this invention, and FIG. 5 is a side view showing an embodiment of this invention.
Similarly, a perspective view of the main parts showing the relay terminal board side, No. 6
This figure is also a perspective view of the main parts showing the video head chip side. 1...Support stand, 1a...Support stand protrusion, 1d...
...Groove, 2...Video head chip, 3...Coil, 3a...Leader wire, 8...Relay terminal board.

Claims (1)

[Claims for Utility Model Registration] A video head chip is attached to a protrusion of a metal support base, and a coil wound around the video head chip is attached to the base of the support base on the side opposite to the side where the video head chip is attached. In a VTR magnetic head equipped with a relay terminal plate for relaying the lead wires of the VTR, two grooves are provided on the side of the relay terminal plate of the protrusion of the support base, and the two lead wires of the coil are inserted into the grooves. When inserted and connected to each terminal of the relay terminal board,
A magnetic head for a VTR, characterized in that the position, width, and depth of the groove are set so that each leader line does not come into contact with either side surfaces or the bottom surface of the groove.