JPH07101651B2 - Inductor structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A small inductor used for a hybrid integrated circuit of a printed circuit board which is widely used in the construction of electronic devices, in which the area of the equivalent circuit is minimized and the inductance value can be easily adjusted. For the purpose of being able to do so, an insulating plate having a hole for mounting a magnetic body and a through hole for connecting to a printed circuit board in the central portion is provided around the periphery of the hole.
... Substrate in which n- _1th coil pattern and short circuit pattern are printed, and through holes for pattern connection are formed at predetermined positions, and pattern of nth coil which makes one round around the periphery of the hole. And a substrate having a through hole at the tip thereof for connecting to the printed circuit board, and by stacking the substrates, the first ... Nth coils are connected by the vias, respectively. The vias for starting and terminating are opposed to the connection pattern of the printed circuit board, and the vias for shorting connect the starting end side of the first coil to the second coil and the third coil by the shorting pattern. And a magnetic body is arranged at the center of each coil.

[Industrial application field]

TECHNICAL FIELD The present invention relates to a small inductor used for a hybrid integrated circuit of a printed board which is widely used for the construction of various electronic devices.

Recently, various electronic devices have been diversified and high performance has been achieved.
Since it is necessary to mount a large number of electronic components such as high-density integrated elements on the printed circuit board to be mounted on equipment, the mounting area can be minimized by integrating multiple small inductors, and the specified inductance value can be easily adjusted. A new inductor structure that can be set to is needed.

[Conventional technology]

Conventionally widely used inductor mounting structure is
As shown in the figure, connection patterns 1-1 are formed on the main surface so that the chip inductors 2 can be connected in series, and short-circuit patterns 1-2 that are electrically connected to the connection patterns 1-1 between the chip inductors 2 are printed. For example ceramic,
The leads 2-1 of the general-purpose fixed type chip inductor 2 are surface-mounted on the respective connection patterns 1-1 on the printed circuit board 1 made of glass or the like and connected in series to form the equivalent circuit shown in FIG. Has been done.

Then, when the inductance value in the filter circuit or the like is kept within a considerable deviation, or when the inductance value needs to be adjusted each time due to performance variations of other mounting components, the printed value is printed on the printed circuit board 1. The portion of the short-circuit pattern 1-2 that has been electrically connected to the connection pattern 1-1 is cut by a laser beam or the like to set a predetermined inductance value.

[Problems to be Solved by the Invention]

The problems with the conventional inductor mounting structure described above are the space for mounting a plurality of chip inductors for forming an equivalent circuit on a printed circuit board and the short-circuit pattern printing for setting a predetermined inductance value. There is a problem that the space is required.

In view of the above problems, it is an object of the present invention to provide a new inductor structure in which the area of the equivalent circuit is minimized and the inductance value can be easily adjusted.

[Means for Solving the Problems]

According to the present invention, as shown in FIG. 2, an insulating plate having a hole 12a for mounting a magnetic body and a through hole 12-1c for connecting to the printed circuit board 11 in the central portion is provided with a coil which makes one round of the periphery of the hole 12a. 12b-1,12b
-2,12b-3,12b-4 pattern and short circuit pattern 12d-1 and 1
2d-2 is printed, and through holes for pattern connection 12
-2c, 12-3c ... 12-6c are arranged on the substrates 12-1, 12-2, 12-3, and the pattern is printed on the coil 12b-4 which makes one round around the periphery of the hole 12a. Through hole 12 to connect with printed circuit board 11
-7c and a lowermost substrate 12-4 having a through hole 12-1c, and by stacking the above-mentioned substrates (12-1, 12-2, ... 12-4), as shown in FIG. As shown, first coil 12b-1, second coil 12
b-2, the third coil 12b-3 and the fourth coil 12b-4 are connected by respective vias 12c-4, 12c-5, 12c-6, and
The via 12c-1 and the via 12c-7 are opposed to the connection pattern of the printed circuit board, and the via 12c-2 and the via 12c-3 are provided on the starting end side of the first coil 12b-1, the second coil 12b-2 and the third coil 12b-2. Connect the starting end of the coil 12b-3 with the short-circuit pattern 12d-1, 12d-2, and arrange the magnetic body 13 at the center of each coil 12b-1, 12b-2, 12b-3, 12b-4. Is composed of.

[Action]

In the present invention, by printing the coil 12b-1, 12b-2, 12b-3, 12b-4 pattern and the short-circuit pattern 12d-1 and 12d-2 which makes one round around the periphery of the hole 12a for mounting a magnetic material, Substrates 12-1, 12-2, 12 with through holes 12-2c, 12-3c ... 12-6c for pattern connection
-3 and the lowermost substrate 12-4 on which the pattern of the coil 12b-4, which also makes a round around the periphery of the hole 12a, is printed, to form an inductor having the magnetic body 13 in the center. , The coils 12b-1, 12b-2, 12b-3, 12b-4 are connected in an overlapping state to minimize the mounting area on the printed circuit board, and the first short circuit pattern 12d formed on the surface of the first circuit board. -1 or by cutting the second short-circuit pattern 12d-2 with a laser beam or the like, the inductance value can be adjusted, and an equivalent circuit of the inductor can be formed in the minimum area.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a schematic diagram of an inductor structure according to this embodiment, and FIG.
The figure shows an exploded perspective view of the inductor structure of the present embodiment. In the figure, 12-1, 12-2, ... 12-4 are the first, second, ... Reference numeral 13 is a magnetic body forming the central core of the coil.

The first board 12-1 is provided with a hole 12a for mounting a magnetic material, for example, in a central portion of the first board 12-1.
On one surface of a thin plate made of, for example, ceramic or glass, which has a first through hole 12-1c having a fine diameter arranged at a position facing with, one end is formed by making one round around the periphery of the hole 12a with, for example, silver paradium. The pattern of the first coil 12b-1 reaching the fourth through hole 12-4c at the other end is printed on the first through hole 12-1c, and the first short circuit pattern 12d-1 is provided near the first through hole 12-1c. And a second short-circuit pattern 12d-2 are formed, and a second through hole 12-2c and a third through hole 12-3c each having a fine diameter are provided at the respective tips thereof.

The second substrate 12-2 includes the holes 12a of the first substrate 12-1 and the first through holes 12-.
1c, second through hole 12-2c, third through hole 12-3c and fourth through hole
Similarly, the hole 12a and the first through hole 12-1 are provided at a position facing the 12-4c.
c, second through hole 12-2c, third through hole 12-3c and fourth through hole 1
2-4c is provided, and the peripheral edge of the hole 12a is approximately 1 from the fourth through hole 12-4c.
The second coil 12b-2 which goes around the other end and reaches the fifth through hole 12-5c
Pattern of the second through hole 12-2c and the fourth through hole 1
The printed circuit board has a first short circuit pattern 12d-1 formed between 2-4c.

The third substrate 12-3 includes the holes 12a of the second substrate 12-2 and the first through holes 12-.
The holes 12a, the first through holes 12-1c, and the third through holes 12- are also provided at positions facing the 1c, the third through holes 12-3c, and the fifth through holes 12-5c.
3c and a fifth through hole 12-5c are provided, and the pattern of the third coil 12b-3, in which the other end reaches the sixth through hole 12-6c by making one round around the periphery of the hole 12a from the fifth through hole 12-5c Is printed on the second short circuit pattern 12d- between the third through hole 12-3c and the fifth through hole 12-5c.
2 is a printed board on which 2 is formed.

The fourth substrate 12-4 includes the holes 12a of the third substrate 12-3 and the first through holes 12-.
1c, and a hole at the same position as the 6th through hole 12-6c
12a and the first through hole 12-1c, and the sixth through hole 12-6c,
A fourth coil which extends substantially once around the periphery of the hole 12a from the sixth through hole 12-6c and reaches the seventh through hole 12-7c provided at the position where the other end faces the connection pad 11-1 of the printed board 11. This is a substrate on which a pattern of 12b-4 is printed.

As shown in FIG. 1, the magnetic body 13 is obtained by sintering and exciting magnetic powder such as ferrite to form a magnetic core of an inductor.

The inductor structure using the above-mentioned members is arranged such that the positions of the ferrite mounting holes 12a and the first through holes 12-1c shown in FIG. 3 substrates 12-
3, laminated with the fourth substrate 12-4, through holes 12-1c, 12-2 respectively
c ... 12-7c is filled with, for example, silver paradium serving as a through conductor, and magnetic powder-carrying holes 12a are filled with magnetic powder such as ferrite, and the layers are baked at the same time as lamination.

By the above-mentioned laminated firing, as shown in the first schematic diagram, the first
Board 1st coil 12b-1, 2nd board 2nd coil 12b-2, 3rd board 3rd coil 12b-3 and 4th board 4th coil 1
2b-4 are connected by the fourth via 12c-4, the fifth via 12c-5 and the sixth via 12c-6, respectively, and the first via 12c
-1 and the seventh via 12c-7 make the start end and the end face a connection pattern of a printed circuit board (not shown), and the second via 12c-2 and the third via 12c-3 cause the first coil 12b-.
1 start end side, second coil 12b-2 and third coil 12b-3
The start end of the coil is connected by a first short circuit pattern 12d-1 and a second short circuit pattern 12d-2, and each coil 12b-1, 12b-2, 12b-3, 12b is connected.
An inductor having a magnetic body 13 arranged at the center of -4 is configured.

As a result, the first short circuit pattern formed on the surface of the first substrate
By cutting 12d-1 or the second short-circuit pattern 12d-2 with a laser beam or the like, the inductance value can be adjusted, and the equivalent circuit shown in FIG. 5 can be constructed in the minimum area.

〔The invention's effect〕

As is clear from the above description, according to the present invention, the configuration area of the equivalent circuit is minimized with an extremely simple configuration,
There is an advantage that the inductance value can be easily adjusted and the like, and it is possible to provide an inductor structure in which a significant economic effect and an effect of improving reliability can be expected.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an inductor structure according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the inductor structure of this embodiment, FIG. 3 is an equivalent circuit diagram of this embodiment, and FIG. FIG. 5 is a perspective view showing a conventional inductor structure, and FIG. 5 is a conventional equivalent circuit diagram. In the figure, 11 is a printed circuit board, 11-1 is a connection pad, 12-1, 12-2, 12-
3, 12-4 is a substrate, 12b-1, 12b-2, 12b-3, 12b-4 are coils, 12-
1c, 12-2c ・ ・ ・ 12-nc are through holes, 12c-1,12c-2, ・ ・ ・ 12c
-n is a via, 12d-1 is a first short-circuit pattern, and 12d-2 is a second short-circuit pattern.

Claims (1)

[Claims] 1. An insulating plate having a hole (12a) for mounting a magnetic material and a through hole (12-1c) for connecting to a printed circuit board (11) in a central portion, and the peripheral edge of the hole (12a) is substantially 1 The first round ...
The n- _1st coil (12b- ₁ , 12b-2, 12b-3, 12b-4) pattern and the short-circuit pattern 12d-1, 12d-2) are printed, and the through holes for the pattern connection are made at the predetermined locations. Hole (12-2c, 12-3c ... 12-n
c) the substrate (12-1, 12-2, ... 12-n _-1 ) perforated, and the nth coil (1
2b-n) pattern is printed, and a substrate (12-nc) having through holes (12-nc) connected to the printed circuit board (11) at the tip is printed.
n) and by stacking the substrates (12-1, 12-2, ... 12-n), the first ... Nth coils (12b-1, 12b-2 ... 12b-
n) are connected by the respective vias (12c-4, 12c-5 ... 12c-n), and the vias (12c-1, 12c-
n) faces the connection pattern of the printed circuit board (11), and the first via the vias (12c-2, 12c-3) for short-circuiting.
The start end side of the coil (12b-1) and the start ends of the second coil (12b-2) and the third coil (12b-3) are connected by the short-circuit pattern (12d-1, 12d-2). , The coil (1
2b-1, 12b-2, 12b-3, 12b-4), wherein the magnetic body (13) is arranged at the center of the inductor structure.