JP3598405B2 - Printed coil parts and printed coil boards - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a printed coil component used in an electronic circuit such as a switching power supply, and more particularly to a configuration for obtaining an electrical connection between a printed coil substrate having a conductor pattern to be a coil formed on a substrate and an external conductor. It is.
[0002]
[Prior art]
As a magnetic component of a transformer and a choke coil used in an electronic circuit such as a switching power supply, a wound-wire type magnetic product has been generally used conventionally. A wound-type magnetic product has a configuration in which a wire such as an enameled wire is wound around a bobbin provided with a lead terminal. In this wound-type magnetic product, a circuit engineer can easily change the number of turns and the ratio of the number of turns of the coil during circuit design and development, so that a transformer or the like having an optimum conversion ratio for the circuit engineer is used. There is an advantage that it is easy to manufacture.
[0003]
At present, there is an increasing demand for smaller and lighter electronic circuits, and there is a demand for smaller electronic components constituting electronic circuits. Under such circumstances, a planar type magnetic product having a structure suitable for a demand for higher frequency, smaller size and lower height of an electronic circuit such as a switching power supply has been put to practical use instead of the above-mentioned wound type magnetic product. (JP-B-39-6921, JP-B-41-10524, JP-A-48-51250, etc.). Rather than forming a coil with a wound wire, for example, a planar type magnetic product is formed by forming a thin-film conductor pattern in a spiral or U-shape on one or both surfaces of a flat insulating substrate or over a multilayer surface including its inner surface. A single printed coil substrate formed or a printed coil formed by laminating a plurality of such printed coil substrates is sandwiched between magnetic material cores.
[0004]
Such a planar type magnetic product can of course realize a reduction in size and height, and can increase the interlinkage area of the magnetic flux as compared with a wound type magnetic product, so that the leakage inductance is reduced and the primary-secondary magnetic product is reduced. Features that can achieve high coupling between the following, features that minimize the increase in copper loss due to the skin effect, and requires coiling of unstable wires because the conductor pattern coil is formed using pattern etching. It has the advantage that the reproducibility is better and the reliability and stability of the quality are improved as compared with the wound wire type magnetic product.
[0005]
In such a planar type magnetic product, a configuration using terminal pins for obtaining electrical connection between a printed coil substrate or a printed coil and an external conductor is disclosed in JP-A-61-74311 and JP-A-61-74311. -75510, Japanese Utility Model Laid-Open No. 4-105512, Japanese Patent Application Laid-Open No. 5-291062, Japanese Patent Application Laid-Open No. 6-163266, and the like.
[0006]
Hereinafter, conventional planar magnetic products disclosed therein will be briefly described. FIG. 8 is a diagram showing a first conventional example shown in, for example, the former two publications out of the above five publications, and FIG. FIG. 8B is a sectional view of a main part of the plane, and FIG. 8C is a side view of the same. In FIG. 8, a laminated wiring board 21 is formed by laminating a plurality of sheet coils in which a conductor pattern 25 of a coil is formed on a thin insulating sheet, and constitutes a printed coil of a transformer as a whole. A through-hole 22 is formed in the printed coil, and a terminal pin 23 is inserted into the through-hole 22. By soldering the terminal pin 23 and the through-hole 22, the conductor patterns 25 of each sheet coil are electrically connected to each other. It is connected. The terminal pins 23 are partially extended in the longitudinal direction, and the extended portions serve as connecting means for connecting a printed wiring board (not shown) to an external conductor and fixing means for a transformer. The cores 24 and 26 are manufactured in a vertically divided shape, and the two cores 24 and 26 are combined so as to sandwich the laminated wiring board 21 to form a magnetic circuit of a transformer.
[0007]
FIGS. 9 and 10 are diagrams showing a second conventional example shown in, for example, the latter three of the above-mentioned five publications. FIG. 9 is a perspective view showing the entire configuration as a transformer. FIG. 10 is an exploded perspective view showing each component. In this conventional thin transformer, a printed coil 32 formed by laminating a plurality of printed coil substrates each having a conductor pattern formed on a surface thereof is mounted on a terminal block 33 having a plurality of terminal pins 35, and this is mounted on a printed circuit board. The structure is sandwiched between the I-shaped core 34 and the E-shaped core 31 vertically. Each of the terminal pins 35 provided on the terminal block 33 has an insertion portion 35a inserted into the through hole 36 of the printed coil 32, and a mounting portion 35b connected to the insertion portion 35a and bent to extend parallel to the mounting surface. And is divided into Then, the insertion portion 35a of each terminal pin 35 and the through hole 36 of the printed coil 32 are electrically connected by solder. The electrical connection with the external conductor is made via the mounting portion 35b of each terminal pin 35.
[0008]
[Problems to be solved by the invention]
In the first conventional example described above, as shown in FIG. 8, the terminal pins 23 press-fitted into the through holes 22 formed in the printed coil are electrically connected to the through holes 22 by soldering. In this method, it is necessary to press-fit the terminal pins 23 into the print coil accurately and vertically, which requires a lot of man-hours for assembling and leads to an increase in the cost of the printed coil component to be manufactured.
[0009]
On the other hand, in the above-described second conventional example, as shown in FIGS. 9 and 10, a terminal block 33 configured to cover the printed coil 32 and the cores 31 and 34 is used. Terminal pins 35 are implanted in the terminal block 33 in advance so as to match the positions of the through holes 36 of the printed coil 32. Therefore, the printed coil component can be formed simply by soldering after dropping the through hole 36 of the printed coil 32 into the terminal pin 35 implanted in the terminal block 33, so that the printed coil component is significantly compared with the first conventional example. In addition, the number of assembly steps can be reduced. However, since the terminal block 33 having a complicated structure has a high manufacturing cost, there is a problem that the total cost as a printed coil component is not always reduced. Therefore, it is conceivable to standardize the shape of the terminal block 33 (size, installation pitch, number of terminal pins 35, etc.) and reduce cost by mass production effect. However, magnetic products such as transformers and chokes that use such printed coil parts generally require a small variety of various products so that each user can obtain desired magnetic characteristics. Therefore, if the shape of the terminal block 33 is standardized and fixed, the applicable range is extremely limited, which is not practical. Therefore, the second conventional example has a problem that an expensive terminal block having a low degree of freedom in shape and increasing the manufacturing cost must be used, and a sufficient reduction in cost cannot be achieved.
[0010]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a printed coil component that can realize a significant cost reduction as compared with the related art by simplifying an assembly process and using low-cost members. And
[0011]
Another object of the present invention is to provide a printed coil board that can easily obtain reliable electrical connection with terminal pins in through holes.
[0012]
[Means for Solving the Problems]
A printed coil component according to the present invention includes a printed coil substrate having a coil formed by a conductor pattern of one or more layers, and a printed coil component capable of electrically connecting the printed coil substrate to an external conductor. A plurality of through holes are formed in a plurality of rows in the printed coil board, and the plurality of through holes are provided on a plurality of insulating bases respectively arranged corresponding to the plurality of rows of the through holes; Terminal pins to be electrically connected to the through-holes in the corresponding row, and electrically connect the terminal pins to the through-holes.
[0013]
The printed coil board according to the present invention is a printed coil board used for a printed coil component, in which a plurality of through holes are formed, a slit is formed from the through hole to an end face thereof, and the slit is The diameter is smaller than the diameter of a cylindrical terminal pin to be inserted into the through hole.
[0014]
[Action]
When producing the printed coil component according to the present invention, each terminal pin pre-planted on an insulating base was inserted into each through hole formed in the printed coil substrate, and this was inserted. Each terminal pin is electrically connected to a corresponding through hole by, for example, soldering. At this time, the positioning of the terminal pins need only be performed on the through-holes, and can be performed only by using a simple positioning jig. The processing is extremely easy as compared with the first conventional example. . Further, in the present invention, only the planting pitch of each terminal pin is limited, and there is no limitation on other factors such as the number of terminal pins. And get higher.
[0015]
In the printed coil board according to the present invention, since the slit narrower than the diameter of the terminal pin is formed from the through hole of the printed coil board to the end face, the connection state between the terminal pin and the through hole by, for example, soldering is determined by this slit. The connection between the two can be easily performed, and the electrical connection between the two can be made more reliable. Since the positioning of the terminal pins is performed in accordance with the through holes, the width of the slit to be formed must be smaller than the diameter of the terminal pins so that the positioning can be performed accurately.
[0016]
【Example】
Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments.
[0017]
FIG. 1 is an exploded perspective view showing one embodiment of the printed coil component of the present invention. In FIG. 1, reference numeral 1 denotes a printed coil board. The printed coil board 1 has a rectangular thin plate shape in which a coil is formed by a conductor pattern over a multilayer surface including its inner layer surface, and can maintain its shape by itself. No components are required. At the center of the printed coil board 1, a rectangular hole 1a is formed. A plurality of (six in the example of FIG. 1) through-holes 3 continuous with the through-hole lands 2 are arranged at both ends in the longitudinal direction of the printed coil board 1 at predetermined equal pitches in the width direction of the printed coil board 1. Is formed. Reference numeral 5 denotes two rectangular parallelepiped bases made of an insulating material. On the upper surface of each base 5, a plurality of (six in the example of FIG. 1) cylindrical terminal pins 4 made of a conductive material are provided. It is planted in line with the through hole 3 at the same pitch. On one side surface of each base 5, a plurality (six in the example of FIG. 1) of conductor protrusions 6 connected to the respective terminal pins 4 are provided in a protruding manner. Each terminal pin 4 is longer than the through hole 3 and its length is approximately twice the length of the through hole 3.
[0018]
Next, a process of assembling the printed coil component of the present invention will be described. FIG. 2 is a plan view, a front view, and a side view showing the printed coil component of the present invention after assembly. First, after positioning each through hole 3 of the printed coil board 1 and each terminal pin 4 of the two bases 5 using a positioning jig, the lower surface of the printed coil board 1 is The corresponding terminal pins 4 are inserted into the respective through holes 3 until they come into contact with the upper surface of the substrate, and then the corresponding through holes 3 and the respective terminal pins 4 are electrically connected by soldering. As shown in FIG. 2, the through holes 3 and the terminal pins 4 are soldered in a state where substantially the upper half of each terminal pin 4 protrudes from the printed coil board 1. In addition, 7 in FIG. 2 shows a solder fillet after this soldering process.
[0019]
Incidentally, a transformer for a switching power supply and a choke coil can be formed by sandwiching the above-described printed coil component between an E-type ferrite core and an I-type ferrite core. FIG. 3 is an exploded perspective view showing one embodiment of such a transformer, and FIG. 4 is a plan view, a front view, and a side view showing a structure after the transformer is assembled. 3 and 4, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and their description is omitted. Reference numerals 8 and 9 in FIGS. 3 and 4 denote ferrite cores sandwiching the printed coil component from above and below. Specifically, 8 is an E-shaped core having convex portions at both ends and the center, and 9 is a flat rectangular parallelepiped. This is an I-shaped core. The central convex portion of the E-shaped core 8 is fitted into the hole 1a of the printed coil substrate 1, and the three convex portions are brought into contact with the upper surface of the I-shaped core 9, so that the two cores 8, 9 and the printed coil component are integrated. Then, a transformer as shown in FIG. 4 is manufactured.
[0020]
FIGS. 5A and 5B show an example of electrical connection between a transformer and a mounting board using the printed coil component of the present invention. 5 (a) and 5 (b), portions denoted by the same reference numerals as those in FIGS. 3 and 4 indicate the same portions. Each conductor protrusion 6 connected to each terminal pin 4 is connected to the mounting board 10 by a solder fillet 11, and an electrical connection between the printed coil component and the mounting board 10 is obtained by soldering the both. In the example shown in FIG. 5A, the height of the base 5 is controlled so that the ferrite core (I-type core 9) is in contact with the mounting board 10, and the heat of the ferrite core is dissipated to the mounting board 10. It is effective when performing through. On the other hand, in the example shown in FIG. 5B, the height of the base 5 is controlled so that the bottom surface of the ferrite core (I-type core 9) is floated from the mounting substrate 10, and the ferrite core and the mounting substrate This is effective when insulating the device 10 from other components.
[0021]
According to the present invention, since the positioning of the terminal pins 4 is mainly based on the through holes 3 of the printed coil board 1, it is possible to assemble using a simple positioning jig, as in the first conventional example (see FIG. 8). Assembling becomes easier as compared with the method of press-fitting the terminal pins 23 and standing upright. Further, only the pitch of the terminal pins 4 implanted in the base 5 is fixed, and the number of the terminal pins 4 and the distance between the terminal pins 4 and 4 facing each other are not limited. Therefore, the second conventional example using the terminal block 33 in which not only the pitch of the terminal pins 35 to be implanted but also the number of the terminal pins 35 and the interval between the terminal pins 35 facing each other is fixed (FIG. 9, FIG. 9). 10), it is possible to flexibly cope with printed coil boards of various shapes, and it is possible to design printed coil parts much more freely. As a result, assembling costs and member costs can be significantly reduced as compared with the conventional print coil components.
[0022]
Next, another embodiment of the present invention will be described. FIG. 6 is an exploded perspective view showing another embodiment of the present invention. In the embodiment shown in FIG. 6, a plurality of printed coil substrates 1 having coils formed by conductor patterns on both surfaces of the substrate are stacked. In order to insulate the adjacent printed coil boards 1 from each other, an insulating sheet 12 is interposed between the adjacent printed coil boards 1 and 1. The embodiment shown in FIG. 6 has a configuration in which four insulating sheets 12 and three printed coil substrates 1 are alternately stacked one by one. In each insulating sheet 12, a hole 12a having the same shape as the hole 1a of the printed coil substrate 1 is formed at the center thereof, and a plurality of holes corresponding to the plurality of through holes 3 of the printed coil substrate 1 are formed at both ends thereof. 13 are formed. The electrical connection between the printed coil boards 1 is made by inserting the terminal pins 4 implanted in the base 5 into the through holes 3 and the holes 13 and performing soldering, as in the above-described embodiment. . In general, in a printed coil board, as the number of conductive pattern layers increases, the manufacturing cost increases exponentially. Therefore, when a configuration in which a large number of conductor patterns are laminated is used, the conductor pattern to be formed is divided into a plurality of printed coil substrates, and as shown in FIG. 6, each printed coil substrate is laminated via an insulating sheet. This can reduce the total cost.
[0023]
FIG. 7 is a plan view and a front view showing a part of still another embodiment of the present invention. 7, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the embodiment of FIG. 7, the same number of slits 14 as the number of the through holes 3 are provided from the end surface of the printed coil substrate 1 to the respective through holes 3. Therefore, when the through hole 3 and the terminal pin 4 are connected by soldering, it is possible to easily visually inspect the connection state of the two through the slit 14, and the solder connection is assured and contributes to the improvement of quality. can do. Since the positioning of the terminal pins 4 is mainly based on the through holes 3 of the printed coil board 1, the width of the slits 14 to be formed must be smaller than the diameter of the terminal pins 4.
[0024]
In the present invention relating to the printed coil component, the shape and arrangement of the terminal pins 4, the shape of the through holes 3 of the printed coil substrate 1, the number of conductor patterns formed on the printed coil substrate 1, and the number of printed coil substrates to be laminated Needless to say, there is no limitation on the shape of the ferrite core to be sandwiched.
[0025]
【The invention's effect】
In the printed coil component according to the present invention, the terminal pins planted on the insulating base are inserted into the through holes of the printed coil substrate, and the terminal pins and the through holes are electrically connected by, for example, solder. Features that are inherent features of molded magnetic products, such as easy reduction of parts height, suppression of copper loss by skin effect, high coupling between primary and secondary, improved quality stability and reliability And the cost of the assembling process and the cost of the members used can be significantly reduced as compared with the conventional printed coil part. As a result, the range of use of the printed coil component has conventionally been limited to special applications, but the present invention can be extended to general switching power supply transformers, choke coils, and the like.
[0026]
Further, since a slit is formed in the through hole from the end surface of the printed coil substrate, visual inspection of the solder connection state between the terminal pin and the through hole is facilitated, and the reliability of the connection is improved and the quality can be improved. .
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of one embodiment of a printed coil component of the present invention.
FIG. 2 is an assembly view of one embodiment of the printed coil component of the present invention.
FIG. 3 is an exploded perspective view of a transformer using the printed coil component of the present invention.
FIG. 4 is an assembly diagram of a transformer using the printed coil component of the present invention.
FIG. 5 is a diagram showing an example of installing a transformer using a printed coil component of the present invention on a mounting board.
FIG. 6 is an exploded perspective view of another embodiment of the printed coil component of the present invention using a plurality of printed coil boards.
FIG. 7 is a partial plan view and a partially assembled view of still another embodiment of a printed coil component of the present invention in which a slit is formed in a printed coil board.
FIG. 8 is a view showing a first conventional planar magnetic product into which terminal pins are press-fitted.
FIG. 9 is an assembly diagram of a second conventional planar magnetic product using a terminal block.
FIG. 10 is an exploded perspective view of a second conventional planar type magnetic product using a terminal block.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Printed coil board 2 Through hole land 3 Through hole 4 Terminal pin 5 Base 6 Conductor protrusion 7 Solder fillet 8 E type core 9 I type core 10 Mounting board 11 Solder fillet 12 Insulating sheet 13 Hole 14 Slit

Claims (2)

A printed coil component having a printed coil substrate in which a coil is formed by one or more layers of conductor patterns, wherein the printed coil substrate and an external conductor can be electrically connected. through holes are formed in multiple lines, said to correspond to each of the plurality rows each of through holes provided in a plurality of insulating base which each are arranged, the outer conductor electrically connected to the to the terminal A printed coil component, wherein pins are inserted through the through holes in a corresponding row, and the terminal pins are electrically connected to the through holes. A printed coil board used for the printed coil component according to claim 1 , wherein a plurality of through holes are formed, a slit is formed from the through hole to an end face thereof, and the slit is formed in the through hole. A printed coil board having a diameter smaller than a diameter of a cylindrical terminal pin to be inserted.

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