JPH051206U - Laminated coil - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a laminated coil having a highly reliable connection of conductor patterns connected in a coil shape. [Structure] Holes 12a, 12b are formed in a laminate in which insulating substrates 21, 22, 23 provided with conductor patterns 5, 6, 7 are laminated.
Are provided, and the conductive patterns 13a and 13b such as solder or silver paste filled in the holes 12a and 12b are used to form the conductor pattern 5.
6, 7 were connected in a coil shape. As a result, the conductor patterns 5, 6, 7 and the conductive materials 13a, 13b are reliably connected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a laminated coil used in a power supply circuit, a filter circuit or the like.

[0002]

[Prior art and problems]

 Conventionally, in this type of laminated coil, a conductive pattern is applied to the surface of an insulating material sheet in which holes are provided in advance by printing or the like to collectively form a conductor pattern and through holes. The insulating material sheet in which the conductor pattern and the through hole are formed is laminated, and the conductor patterns are connected in a coil shape through the through hole.

However, due to problems such as warpage and distortion of the insulating material sheet, the contact between the conductive part of the through hole and the conductor pattern becomes unstable, and when this coil is used in a place where the environmental conditions are severe, the through hole and the conductor pattern are I was worried about the connection reliability between them. Therefore, an object of the present invention is to provide a laminated coil in which the conductor patterns connected in a coil shape have high connection reliability.

[0004]

[Means and actions for solving the problem]

 In order to solve the above problems, the laminated coil according to the present invention has a hole in which a conductor pattern is exposed in a laminate in which conductor patterns and insulators are alternately laminated, and a conductive material filled in the hole is formed. The conductor pattern is connected in a coil shape.

The conductor pattern exposed on the wall of the hole is connected in a coil shape through the conductive material filled in the hole. Even if some warpage occurs, the liquid conductive material is poured, so that the conductive material and the conductor pattern exposed on the hole wall are securely connected. The conductive material is prepared by pouring molten solder, silver paste, etc. into the holes and then curing the same.

[0006]

[Embodiments] Hereinafter, embodiments of the laminated coil according to the present invention will be described with reference to the accompanying drawings. First Embodiment, FIGS. 1 to 3 First, as shown in FIG. 1, insulating substrates 1, 2 and 3 made of an epoxy resin material or the like are prepared. Square holes 1a, 2a, 3a are provided in the central portions of the respective substrates 1, 2, 3. A conductor pattern 5 is provided on the upper surface of the substrate 1 around the square hole 1a by means such as printing. The ends 5a and 5b of the conductor pattern 5 are exposed at the front end face of the substrate 1. Similarly, the conductor patterns 6 and 7 are provided on the upper surfaces of the substrates 2 and 3, and the end portions 6a, 6b, 7a and 7b of the conductor patterns 6 and 7 are exposed at the front end faces of the substrates 2 and 3, respectively. There is. Materials such as Cu, Ag, and Ag-Pd are used for the conductor patterns 5, 6, and 7.

These substrates 1, 2 and 3 are made into a laminate 10 as shown in FIG. 2 with an insulating adhesive interposed, for example. The square holes 1a, 2a and 3a are used as square holes 10a into which a core made of a magnetic material is fitted. Small circular holes 12a and 12b are provided at the front edge of the laminate 10. The diameter of the small circular holes 12a, 12b is preferably smaller than the width of the conductor patterns 5, 6, 7. A conductive material 13a, 13b filling the holes 12a, 12b is produced by pouring a molten solder, a silver paste or the like into the holes 12a, 12b and then hardening. As shown in FIG. 3, the conductive material 13a electrically connects the end 5b of the conductor pattern 5 and the end 6a of the conductor pattern 6. Similarly, the conductive material 13b electrically connects the end portion 6b of the conductor pattern 6 and the end portion 7a of the conductor pattern 7. In this way, the conductor patterns 5, 6, 7 are connected in a coil shape via the conductive materials 13a, 13b.

Thereafter, external electrodes electrically connected to the ends 5a, 5b, 6a, 6b, 7a, 7b of the conductor patterns 5, 6, 7 are provided on the surface of the laminate 10, and the square holes 10a are provided. The core is fitted into the to form a laminated coil. In this way, a laminated coil having a highly reliable connection of the conductor patterns connected in a coil shape can be obtained. [Second Embodiment, FIG. 4] In this embodiment, the conductor pattern has a spiral shape in order to increase the number of windings of the coil. FIG. 4 shows a state in which the laminate is disassembled after the small square holes are provided. Square holes 24 are provided in the central portions of the insulating substrates 21, 22, 23, respectively, and spiral conductor patterns 25, 26, 27 are provided around the square holes 24. Small square holes 28a, 28b, 28c, 28d are provided at the same position on the front side of each of the substrates 21, 22, 23. The ends of the conductor pattern 25 surround the small square holes 28a and 28b, and similarly, the ends of the conductor patterns 26 and 27 surround the small square holes 28b, 28c and 28d, 28c. With the above configuration, the conductor patterns 25, 26, 27 are connected in a coil shape through the conductive material in a state where the substrates 21, 22, 23 are stacked and the small square holes 28a to 28d are filled with the conductive material. Will be done.

The laminated coil thus obtained is a coil having a large number of turns in addition to the effects of the first embodiment. [Other Embodiments] The laminated coil according to the present invention is not limited to the above-mentioned embodiment, and can be variously modified within the scope of the invention.

In order to further increase the number of windings of the coil, the number of insulating substrates provided with the conductor pattern may be increased. Further, as in the above-mentioned embodiment, it is not always necessary to use an adhesive for laminating the conductor pattern and the insulating substrate, and the conductor pattern and the insulating substrate are sandwiched between cores and laminated, or a conductor pattern is stacked. An adhesive tape may be wound around the insulating substrate and laminated.

[0011]

[Effect of the device]

 As is apparent from the above description, according to the present invention, a hole is formed in a laminate in which a conductor pattern and an insulator are alternately laminated, and the conductor pattern is coiled with a conductive material filled in the hole. Since the connection is made, the conductor pattern and the conductive material are surely connected. As a result, a laminated coil having a highly reliable connection of the conductor patterns connected in a coil shape can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a laminated coil according to the present invention, showing a state before lamination.

FIG. 2 is a perspective view showing a state after the laminated coil shown in FIG. 1 is laminated.

FIG. 3 is a vertical cross-sectional view taken along line X-X ′ of FIG.

FIG. 4 is an exploded perspective view showing a laminated coil according to a second embodiment of the present invention and showing a state after lamination.

[Explanation of symbols]

 1, 2, 3 ... Insulating substrate 5, 6, 7 ... Conductor pattern 12a, 12b ... Hole 13a, 13b ... Conductive material 21, 22, 23 ... Insulating substrate 25, 26, 27 ... Conductor pattern 28a, 28b, 28c , 28d ... hole

Claims (1)

[Claims for utility model registration] [Claim 1] A hole in which the conductor pattern is exposed is formed in a laminate in which conductor patterns and insulators are alternately laminated, and the conductor pattern is filled with a conductive material. A laminated coil characterized by being connected in a coil shape.