JPH0548245Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a printed wiring board for mounting a magnetic head, and particularly to a printed wiring board for mounting a video head for a VTR.

[Conventional technology]

In a conventional magnetic head of this type, for example, as shown in FIG. 3, a magnetic core 1 is connected to a printed wiring board 2.
One end and the other end of the coil 4 wound around the magnetic core 1 are connected to the printed wiring board 2 through the through hole 3a formed in the mounting plate 3.
They are connected to coil connection lands 5a and 6a provided at one ends of a pair of printed wiring patterns 5 and 6 formed above, respectively. At the other ends of the printed wiring patterns 5 and 6, leads 5b and 6b, which are wider than the lands 5a and 6a, are provided. A pair of lead wires 7a toward
and 8a can be pulled out. Note that the reference numeral 3b indicates a mounting hole drilled in the mounting plate 4.

The conventional printed wiring board for mounting a magnetic head constructed in this manner has a problem in that the lead wires 7a and 8a can only be drawn out downward.

Therefore, as shown in FIG. 4, three printed wiring patterns 11 and 12 are formed on the printed wiring board 2.
and 13 are provided, and the coil connection land 11a of the printed wiring patterns 11 and 12 is provided in common, and the coil connection land 13a is provided at one end of the printed wiring pattern 13, and further, the coil connection land 13a is provided at the other end of the printed wiring pattern 11. The first lead wire drawing land 11b is located at the bottom of the left side of the printed wiring board 2, and the printed wiring pattern 12
Second lead wire drawing land 1 at the other end
2b is formed at the upper part of the printed wiring board 2 near the right side, and a third land 13b for drawing out lead wires, which is the other end of the printed wiring pattern 13, is formed at the lower part of the printed wiring board 2 near the right side. Printed wiring boards are already available.

In the conventional magnetic head mounting printed wiring board configured as described above, the lead wires 7a, 8a are connected to the first and third lead wire drawing lands 11b,
Not only can the lead wires 7b, 8b be pulled out downward from the lead wire 13b, but also the lead wires 7b, 8b can be pulled out rightward from the second and third lead wire drawing lands 12b, 13b.

In addition, in the conventional printed wiring board for mounting a magnetic head shown in FIGS. 3 and 4 above,
In order to prevent solder flow between the printed wiring patterns 11 to 13, the parts other than the lands 11a, 13a, 11b to 13b on the upper surface of the printed wiring board 2 are covered with an insulating film (not shown) made of resist or the like. Covered.

[Problem that the invention attempts to solve]

However, in the conventional printed wiring board for mounting the magnetic head shown in Figs. 3 and 4, the lead wires could not be drawn out in only one direction or two directions, so depending on the VTR standard,
There was a problem in that the printed wiring board had to be changed depending on the direction in which the lead wires were pulled out.

[Means for solving problems]

In the magnetic head of the present invention, a magnetic core is fixed to a mounting plate to which a printed wiring board is fixed, and one end and the other end of a coil wound around the magnetic core are attached to a printed wiring pattern formed on the printed wiring board. In the connected printed wiring board for mounting the magnetic head, a pair of printed wiring patterns to which one ends of the above-mentioned coils are respectively connected, a pair of lands for drawing out lead wires provided on each of these pair of printed wiring patterns, and the above-mentioned printed wiring pattern. Another pair of printed wiring patterns to which the other ends of the coils are connected, another pair of lands for drawing out lead wires provided on each of these pair of printed wiring patterns, and to prevent shorts between the printed wiring patterns. A first layer of insulating film coated on parts of the printed wiring pattern other than the land, and a second layer coated on parts where the lead wire drawn out from the land and the printed wiring pattern are likely to intersect. It has an insulating film.

[Effect]

The printed wiring board for mounting the magnetic head of the present invention has four printed wiring patterns, so the lead wires can be drawn out in three directions (left, right, and downward), and the lead wires and the printed wiring patterns can be connected. Shorts are also prevented by the second layer of insulation film.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a printed wiring board for mounting a magnetic head, showing an embodiment of the present invention. In the magnetic head mounting printed wiring board of this embodiment, first to fourth printed wiring patterns 15, 16, 17 and 18 are formed on the printed wiring board 2. The first printed wiring pattern 15 and the fourth printed wiring pattern 18 are commonly connected at one end by a coil connection land 15a, and the second printed wiring pattern 1
6 and the third printed wiring pattern 17 are commonly connected at one end by a coil connecting land 16a. The first to fourth lead wire extraction lands 15b to 18b, which are the other ends of the first to fourth printed wiring patterns 15 to 18, are located at the upper left side, the lower left side, and the upper right side of the printed wiring board 2. and at the bottom of the right side. As shown in FIG. 2, a first insulating film 19 made of resist or the like is provided on the upper surface of the printed wiring board 2 other than the lands 15a, 16a and 15b to 18b.
is covered. Furthermore, the first layer of insulation film 19 on the side of the first lead wire extraction land 15b
A second layer of insulating film 20 is partially coated on the upper surface of the second printed wiring pattern 16 .

In the magnetic head mounting printed wiring board of this embodiment configured in this way, the lead wires 7a, 8a
The land 16 for drawing out the second and fourth lead wires
Not only can the lead wires 7b, 8b be pulled out to the right from the third and fourth lead wire drawing lands 17b, 18b, but also the lead wires 7c , 8c can be drawn out to the left from the first and second lead wire drawing lands 15b, 16b. When the lead wire 7c is pulled out toward the left, there is a risk that the lead wire 7c and the printed wiring pattern 16 overlap and the first layer of insulation film 19 alone causes a shorting between them. In the printed wiring board for mounting the magnetic head, a second layer of insulating film 20 is further coated on the portion where the lead wire 7c may intersect with the printed wiring pattern 16, so that the lead wire 7c and the printed wiring pattern 16 are There is no risk that the vehicle will be shot.

[Effect of idea]

As described above, according to the present invention, the lead wires can be pulled out in three directions (left, right, and downward), so a magnetic head can be mounted on a VTR of any standard, and the printed wiring board can be mounted on a VTR of any standard. This has the effect of being able to unify and standardize.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a printed wiring board for mounting a magnetic head showing one embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of the printed wiring board shown in FIG. 1, and FIG. 3 is a conventional FIG. 4 is a plan view showing another example of the conventional printed wiring board for mounting a magnetic head. In the figure, 1...Magnetic core, 2...Printed wiring board, 3...Mounting plate, 4...Coil, 7a~
7c, 8a~8c... Lead wire, 15~18...
Printed wiring pattern, 15a, 16a... land for coil connection, 15b to 18b... land for drawing out lead wire, 19... first layer insulation film, 20
...This is the second layer of insulation film.

Claims (1)

[Scope of utility model claims] For mounting a magnetic head, in which a magnetic core is fixed to a mounting plate to which a printed wiring board is fixed, and one end and the other end of a coil wound around the magnetic core are connected to a printed wiring pattern formed on the printed wiring board. In the printed wiring board, a printed wiring pattern to which one end of the coil is connected;
A pair of lands for drawing out lead wires provided on this printed wiring pattern, and another printed wiring pattern to which the other end of the coil is connected;
Another pair of lands for drawing out lead wires provided on this printed wiring pattern and a first layer of insulation coated on a portion of the printed wiring pattern other than the land to prevent shorts between the printed wiring pattern. 1. A printed wiring board for mounting a magnetic head, comprising a film and a second insulating film coated on a portion where a lead wire drawn out from the land and the printed wiring pattern may intersect.