JPH0831641A - Laminated coil - Google Patents

Abstract

PURPOSE:To obtain a laminated coil where a process that a part of an insulating sheet provided onto the surface of a coil conductor is removed for connection of the coil conductor can be dispensed with. CONSTITUTION:Sheets 141 and 142 are so laminated as to make coil conductors 18 confront each other sandwiching an insulating member 301 between them. Sheets 143 and 144 are similarly laminated so as to make conductors 18 confront each other sandwiching an insulating member 302 between them. The connectors 19 of the coil conductor 18 provided to the sheets 141 and 142 are electrically connected together with conductive paste 28 through the intermediary of a via-hole 34 provided to the insulating member 30. The lead-out parts 22 of the coil conductors 18 provided onto sheets 143 and 144 are made to overlap each other and electrically connected together by a means such an ultrasonic welding equipment. The tips of the lead-out parts 20 of the coil conductors 18 provided onto sheets 142 and 143 are turned down, made to overlap each other, and electrically connected together by a means such an ultrasonic welding equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated coil, and more particularly to a laminated coil such as a transformer or a filter.

[0002]

BACKGROUND OF THE INVENTION In general, a laminated coil is an electrical connection in which an insulating sheet having a conductor for a coil formed on the surface is laminated to form a coil portion, and the conductors for each coil are provided on the insulating sheet. It is connected through means. Here, as an electrical connection means, after removing the insulator sheet portion where the connection portion of the coil conductor is located to expose the front and back surfaces of the coil conductor connection portion, the connection portions with exposed front and back surfaces are stacked. It is conceivable that the connecting portions are connected to each other by spot welding, a conductive paste, solder or the like.

As another electrical connection means, the connecting portion of the coil conductor is projected from the edge portion of the insulating sheet, the protruding coil conductor connecting portion is stacked, and then the connecting portions are connected to each other. Those that are connected by spot welding, a conductive paste, solder or the like are conceivable. In this case, the insulator sheet portion where the coil conductor connecting portion is located is removed, and the front and back surfaces of the connecting portion are exposed.

As described above, both of them need to remove a part of the insulator sheet where the coil conductor connecting portion is located. Therefore, the number of manufacturing processes is increased, and the manufacturing cost of the laminated coil is increased. Therefore, an object of the present invention is to provide a laminated coil that can omit the step of removing a part of the insulator sheet provided with the coil conductor on the surface for connecting the coil conductors to each other.

[0005]

In order to solve the above-mentioned problems, in the laminated coil according to the present invention, at least a pair of insulating sheets among a plurality of insulating sheets are made to face the coil conductor. It is characterized in that the coil conductor connecting portions which are laminated with an insulating member sandwiched therebetween and which are in close contact with the insulating sheet are electrically connected to each other through a via hole provided in the insulating member.

Further, the laminated coil according to the present invention is characterized in that the coil conductor connecting portions which are in close contact with the insulating sheet are overlapped and electrically connected to each other in a state of protruding from the edge portion of the insulating member. To do. With the above configuration, the coil conductor is electrically connected without removing a part of the insulator sheet provided with the coil conductor, that is, without exposing the front and back surfaces of the coil conductor connecting portion. Will be.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the laminated coil according to the present invention will be described below with reference to the accompanying drawings. The following examples describe laminated coils used as transformers. As shown in FIG. 1, the laminated coil 1 includes a coil portion 10
And magnetic cores 40 and 45. The coil portion 10 is
Insulator sheet 14 shown in FIGS. 2, 4, 5, and 7.
(14 ₁ , 14 ₂ , 14 ₃ , 14 ₄ ) and the insulating member 30 (30 ₁ , 30 ₂ ) shown in FIGS. 3 and 6 are laminated. A hole 16 for inserting the core 40 is provided at the center of the insulator sheet 14 shown in FIGS. 2, 4, 5, and 7.

A spiral coil conductor 18 is formed on the upper surface of the sheets 14 ₁ and 14 ₃ with the hole 16 as the center, and a spiral coil conductor 18 is formed on the lower surface of the sheets 14 ₂ and 14 ₄ with the hole 16 as the center. The conductor 18 is formed. Sheet 14
For this, an insulating material such as a polyimide substrate is used. Further, one lead portion 20 of the coil conductor 18 and a plurality of reinforcing dummy conductors 21 that are not connected to the coil conductor 18 project from the edge of the sheet 14. The lead portion 20 and the reinforcing dummy conductor 21 are in close contact with the sheet 14, and the portion of the sheet 14 where the lead portion 20 and the reinforcing dummy conductor 21 are located is not removed. here,
The reinforcing dummy conductor 21 is for increasing the mechanical strength of the lead-out portion 20 of the coil conductor 18. Also,
When connecting the lead-out portions 20 of the coil conductor 18,
It is also used to be able to perform spot welding or soldering under constant working conditions. Therefore, it is not always necessary to provide the reinforcing dummy conductor 21.

Further, the other lead-out portion 22 of the coil conductor 18 projects from the edge of the hole 16 of the sheets 14 ₃ and 14 ₄ . The drawer 22 is in close contact with the seat 14,
The portion of the sheet 14 where the drawer portion 22 is located is not removed. The insulating member 30 (3
0 ₁ , 30 ₂ ) are sheet-shaped, and a hole 32 for inserting the core 40 is provided in the center thereof. The insulating member 30 ₁ is provided with a via hole 34 for electrically connecting the coil conductors 18 to each other. The insulating member 30 is made of an insulating material such as a polyimide substrate,
It is formed by means such as punching or etching.

These insulating sheet 14 and insulating member 3
0 indicates the sheet 14 as shown in FIG.₁, Member 30₁, Shi
14₂, Sheet 14₃, Member 30₂, Sheet 14_FourOrder of
Stacked on. That is, the sheet 14₁And sheet 1
4₂Is the member 30 with the coil conductors 18 facing each other.₁Sandwich
Are stacked in. Similarly, sheet 14₃And sheet 14 _Four
Is the member 30 with the coil conductors 18 facing each other.₂Across
It is stacked.

[0011] The connection portion 19 of the coil conductors 18 provided on the seat 14 _1, via holes provided ultrasonic welding, conductive paste or by means of solder or the like, in member 30 ₁ 34
Is electrically connected to the connecting portion 19 of the coil conductor 18 provided on the sheet 14 ₂ . In this embodiment, the conductive paste 28 is used. Here, the connecting portion 19 is the sheet 1
Seat 1 which is in close contact with 4 and in which the connecting portion 19 is located
The four parts have not been removed.

Further, since the drawn-out portions 22 of the coil conductors 18 provided on the sheets 14 ₃ and 14 ₄ are directly opposed to each other, they are superposed as they are, and they are superposed by ultrasonic welding, a conductive paste, solder or the like. It is electrically connected. Similarly, since the reinforcing dummy conductors 21 provided on the sheets 14 ₁ and 14 ₄ also directly face each other, they are directly overlapped and connected.

The lead-out portion 20 of the coil conductor 18 provided on each of the seats 14 ₂ and 14 ₃ is provided between the seats 14 ₂ ,
Since 14 ₃ are provided, the respective tip portions are folded back so that the drawer portions 20 directly face each other, and then superposed and electrically connected by means of ultrasonic welding, conductive paste, solder or the like. Has been done. At this time, sheet 1
The portion where 4 ₂ and 14 ₃ are folded may be shaped by a double-sided adhesive tape, an adhesive, or the like, or may be covered by solder and shaped. Similarly, the reinforcing dummy conductors 21 provided on the sheets 14 ₂ and 14 ₃ are also overlapped and connected after the tip portions are folded back so as to directly face each other.

Further, the leading end portion of the lead-out portion 20 of the coil conductor 18 provided on each of the sheets 14 ₁ and 14 ₄ is folded back in order to ensure electrical connection with a printed circuit board or the like. Also at this time, the folded portions of the sheets 14 ₁ and 14 ₄ may be shaped by a double-sided adhesive tape, an adhesive, or the like, or may be covered by solder and shaped. A hole 10a constituted by a hole 16 provided in the sheet 14 and a hole 32 provided in the member 30 is provided in the central portion of the coil portion 10 configured by laminating the insulating sheet 14 and the insulating member 30. . Lead-out parts 20, 22 and reinforcing dummy conductor 2
Reference numeral 1 projects from the side surface of the coil portion 10 in an overlapping state or in a single state to form a surface mounting type extraction electrode.

Only one inductor may be formed in the coil portion 10, or a plurality of inductors may be formed and used as a transformer or the like. In addition, a plurality of inductors can be connected in series or in parallel by changing the connection method of the coil conductor 18 provided on each insulator sheet 14. Further, a core 40 having an E-shaped cross section and a core 45 having an I-shaped cross section are attached. The core 40 has a middle leg portion 42 at the center and outer leg portions 44a and 44b at both ends. The middle leg portion 42 is inserted into the hole 10 a of the coil portion 10. Cores 40 and 45
Are abutted and fixed with an insulating tape or the like.

In the laminated coil 1 thus obtained, it is not necessary to remove a part of the insulator sheets 14 _{1 to} 14 ₄ for connecting the coil conductor 18, and the number of manufacturing steps can be reduced. The laminated coil according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist.

The lead-out portion or the reinforcing dummy conductor may be bent or folded back at its tip to be a surface-mounting type lead-out electrode as in the above embodiment, or may be a discrete type electrode without being bent. As the insulating member, in addition to the sheet-shaped member as in the above embodiment, a film-shaped member formed by applying and curing an insulating resin on the surface of the insulator sheet 14 by means of screen printing or the like. It may be.

As for the connecting structure of the lead-out portions 20 of the coil conductors 18 provided on the sheets 14 ₂ and 14 ₃ , as shown in FIG. 9, the coil conductor 1 provided on the sheets 14 ₃ is used.
8 of the pull-out portion 20 of FIG.
May directly face each other. Apart from this, FIG.
Also, as shown in FIG. 11, the tongue portion 26 may be provided by extending the tip end portion of the drawer portion 20, and the tongue portion 26 may be folded back so that the drawer portion 20 directly faces each other.

Further, in the above-mentioned embodiment, the hole for inserting the middle leg portion of the core is provided in the central portion of the insulating sheet, but such hole may not be provided. . In this case, the core is of a type having no middle leg. Further, other than the transformer, it may be a laminated coil used as a filter or may have no core.

[0020]

As is apparent from the above description, according to the present invention, the coil conductor connecting portions which are in close contact with the insulating sheet are electrically connected to each other through the via holes provided in the insulating member, Alternatively, since a structure is adopted in which the coil conductors are overlapped and electrically connected in a state of protruding from the edge of the insulating member, a part of the insulator sheet provided with the coil conductors on the surface is used for connecting the coil conductors to each other. The step of removing it can be omitted, and a laminated coil with low manufacturing cost can be obtained. In addition, this simplifies the design process and the manufacturing process when manufacturing multiple types of laminated coils.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a laminated coil according to the present invention.

FIG. 2 is a plan view of an insulator sheet provided with a coil conductor used in the coil section shown in FIG.

FIG. 3 is a plan view of an insulator used for the coil section shown in FIG.

FIG. 4 is a plan view of an insulator sheet provided with a coil conductor used in the coil unit shown in FIG.

5 is a plan view of an insulator sheet provided with a coil conductor used in the coil unit shown in FIG.

6 is a plan view of an insulator used in the coil section shown in FIG.

7 is a plan view of an insulator sheet provided with a coil conductor used in the coil section shown in FIG.

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a sectional view showing another embodiment of the conductor connecting portion for the coil.

FIG. 10 is a front view showing another embodiment of the conductor connecting portion for the coil.

FIG. 11 is a side view showing a connected state of the coil conductor connecting portion shown in FIG. 10.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Laminated coil 10 ... Coil part 14 (14 ₁ , 14 ₂ , 14 ₃ , 14 ₄ ) ... Insulator sheet 18 ... Coil conductor 19 ... Coil conductor connection part 20, 22 ... Coil conductor lead-out part (coil Conductor connection portion) 30 (30 ₁ , 30 ₂ ) ... Insulating member 34 ... Via hole

Claims (2)

[Claims] 1. A laminated coil having a coil portion formed by laminating a plurality of insulating sheets each having a conductor for a coil provided on the surface thereof, wherein at least a pair of insulating sheets among the plurality of insulating sheets is formed. The coil conductors are laminated so as to face each other with an insulating member sandwiched therebetween, and the coil conductor connecting portions in close contact with the insulator sheet are electrically connected to each other through a via hole provided in the insulating member. Stacked coil. 2. A laminated coil having a coil portion formed by laminating a plurality of insulating sheets each having a coil conductor provided on a surface thereof, wherein at least a pair of insulating sheets among the plurality of insulating sheets is formed. The coil conductors are opposed to each other and stacked with an insulating member sandwiched therebetween, and the coil conductor connecting portions that are in close contact with the insulator sheet are overlapped and electrically connected to each other in a state of protruding from the edge of the insulating member. A laminated coil characterized in that