JPH04137505A - Plane inductance element - Google Patents

Abstract

PURPOSE:To easily and inexpensively fix the central end sections of a plurality of spiral planar windings to each other by providing a conductive terminal which is electrically connected to the central sections of the planar windings to a core member put between the central sections. CONSTITUTION:A conductive terminal 15 is patterned so that the terminal 15 can electrically connect the central end sections 12a and 13a of a pair of upper and lower spiral planar windings 12 and 13 to each other. Since the terminal 15 which connects the central end sections 12a and 13a of the planar windings 12 and 13 is fixed to a core rod 14 put between the end sections 12a and 13a, the terminal 15 can be easily and accurately positioned to the end sections 12a and 13a. Therefore, the fixing of the conductive terminal 15 to the end sections 12a and 13a by welding, etc., can be performed easily and surely and the workability of the fixing work can be improved. As a result, the fixing cost can be reduced.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a small and thin planar inductance element suitable as an inductance element for power supplies, inverters, oscillators, etc. The present invention relates to a planar inductance element with an improved method of electrically connecting the spiral center ends of shaped windings.

(Prior art) Conventionally, this type of planar inductance element has, for example, a sixth
As shown in the figure, when two planar coils (windings) 1 and 2 arranged concentrically opposite each other are laminated concentrically, two One end of each of the main lead wires 3 and 4 is fixed, the other ends are drawn out of the coil, and the drawn ends are connected to each other.

Furthermore, the conventional planar inductance element shown in FIG.
By simply overlapping the pair of upper and lower planar coils 5 and 6 concentrically, these spiral central ends 5a and 6a
These spiral central ends 5a and 6a are electrically connected to each other by closely adhering them to each other and fixing the adhered portions by welding, soldering, or the like.

(Problem to be Solved by the Invention) However, in the conventional planar inductance element shown in FIG. Therefore, the thickness of the planar inductance element becomes thicker by the thickness of these lead wires 3.4, which hinders reduction in thickness.

In addition, in the conventional planar inductance element shown in FIG. 8, the center ends 5a and 6a of each spiral of the planar coil 5.6 are overlapped and fixed, so that the space required for welding, etc. 5a.

It is necessary to provide a wide area around 6a, which prevents miniaturization of the planar coils 5 and 6.

Furthermore, in the planar inductance element shown in FIGS. 6 and 7, the planar winding L2. 5. Since the vertical cross-sectional shape of the linear conductor No. 6 is circular, it is not easy to align these spiral central ends 1a, 2a, 5a, and 6a when they are stacked vertically, and it is difficult to align them when stacked. Since the joint area is small, these spiral central ends 1a, 2a, 5a,
There are problems in that it is not easy to fix the 6a together by welding, etc., and it is also unstable, and the fixation strength is low.

Therefore, this invention was made in consideration of such circumstances, and its purpose is to simplify fixing such as welding between the spiral center ends of a plurality of planar windings and reduce costs by using a simple structure. It is an object of the present invention to provide a planar inductance element that can be used in various ways.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above problems, the present invention is configured as follows.

In other words, in this invention, a plurality of planar windings forming a conductor in a spiral shape are arranged facing each other, and a core member made of an electrical insulator is interposed between the spiral centers of these planar windings. , characterized in that a conductive terminal electrically connected to the spiral center portion of the plurality of planar windings is provided.

(Function) Wiring for selectively electrically connecting the spiral center ends of a plurality of planar windings, connection for simply drawing out the spiral center ends to the outside, etc. is performed by the conductive terminal of the core member.

Since this conductive terminal is fixed to a core member interposed between the spiral centers of a plurality of planar windings, the positioning of these spiral centers and the terminal can be performed very easily and accurately. I can do it.

For this reason, it is possible to both simplify and ensure fixing such as welding between the center portion of the spiral and the terminal, thereby improving the workability of the fixing work and reducing costs.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5. Note that common parts in FIGS. 1 to 5 are denoted by the same reference numerals.

FIG. 1 is an enlarged perspective view of essential parts of an embodiment of the present invention.
In the figure, the planar inductance element 11 has, for example, a pair of upper and lower planar windings 12 and 13 disposed concentrically facing each other in the vertical direction, and a core ring 14 as a core member is interposed between these spiral central ends 12a and 13a. I'm letting you do it.

Each of the planar windings 12, 13 is formed by winding the conductors 12b, 13b in a planar circular spiral shape.
A planar coil formed by printing a linear conductor in a planar spiral shape, or a slice formed by winding a conductor such as a rectangular copper foil of a required width in a circular spiral shape and slicing it into small widths in the axial direction. It is composed of coils, etc.

The core ring 14 is made of an electrical insulator and is formed, for example, into a solid round bar, and vertically penetrates into the circular space of the spiral central ends 12a and 13a of the pair of upper and lower planar windings 12. is inserted into.

As shown in FIG. 2, the core ring 14 has an axially elongated conductive terminal 15 formed on its outer peripheral surface by patterning or the like.

As shown in FIG. 3, this conductive terminal 15 has a spiral center end 12a of the planar winding 12 in the upper part of the figure at its upper end.
The spiral center end 13 of the planar winding 13 shown below in the figure is attached to the lower end.
A is fixed and electrically connected by welding, soldering, etc.

In other words, the conductive terminal 15 is connected to the upper and lower pair of planar windings 12 .
The spiral central ends 12a and 13a of the 13 spirals are patterned so as to be electrically connected to each other.

According to this embodiment, therefore, a plurality of planar windings 12
．． Since the conductive terminal 15 for connecting the spiral central ends 12a, 13a of 13 is fixed to the core ring 14 interposed between these spiral central ends 12a, 13a, these central ends 12a, 1[ A and the conductive terminal 15 can be easily and accurately positioned.

Therefore, it is possible to both simplify and ensure fixing such as welding between these spiral central ends 12a and 13a and the conductive terminal 15, and reduce costs by improving the workability of the fixing work. can be achieved.

In addition, in FIGS. 1 to 3, for convenience of explanation and illustration, the case where the conductive terminal 15 is formed vertically has been described, but it is preferable that the conductive terminal 15 is formed, for example, in the shape of a step, and the upper end thereof It is better to shift the lower ends in the horizontal direction rather than aligning them in the vertical direction, which makes it easier to weld or solder these upper and lower ends to the spiral center ends 12a and 13a of the planar windings 12 and 13. It is possible to improve the work efficiency when carrying out.

FIG. 4 is a perspective view of another embodiment of the present invention, which is characterized in that the upper and lower pair of conductive terminals 15a and 15b of the core ring 14 are patterned, for example, for a transformer. Terminals 15a and 15b are spiral central ends 12a and 13a of a pair of upper and lower planar windings 12.13.
These spiral central ends 12a are not electrically connected to each other.
, 13a through lead wires 16° and 17 to the outside of the coil.

The upper conductive terminal 15a extends upward in the figure from the upper end of the peripheral surface of the core ring 14 in the figure, bends at a nearly right angle, then extends onto the upper surface thereof, terminates at the center of the ring, and forms one end of the lead wire 16. It is connected to and pulled out of the coil.

On the other hand, the lower conductive terminal 15b bends from the lower end of the circumferential surface of the core ring 14 downward in the figure at an almost right angle, extends onto the lower surface thereof, terminates at approximately the center thereof, and ends at one end of the lead wire 17. is connected to and pulled out of the coil.

FIG. 5 shows a modification of the core ring 14, in which the core ring 20 has a main body 20a formed inside a hollow cylindrical body, and a plurality of conductive terminals 21, 21 on the outer peripheral surface of the main body 20a.
The main feature is that... are arranged in a stair-like manner at required intervals.

In other words, the core ring 20 is configured to increase the inductance component and the coupling coefficient of the transformer by inserting a magnetic material (not shown) such as ferrite having electrical insulation into the cavity of the main body 20a. It is something.

In addition, since the conductive terminals 21 are arranged in a stepped manner at required intervals, it is difficult to work when fixing the spiral central ends 12a, 13a of the planar winding 12, 13 to the conductive terminals 21 as described above. You can increase your sexuality.

Note that this core ring 20 may be constructed from a flexible substrate.

A plurality of conductive terminals 21.21... are electrically connected to each other by patterning conductors (not shown) or are electrically insulated from each other.
A plurality of planar windings 12, 13, connected to 21...
The spiral central ends 12a, 13a, . . . can be electrically connected or not connected as appropriate. In other words, selective connection becomes extremely easy.

Further, in each of the above embodiments, the case where the spiral shape of the planar winding wire 12, 13 is formed into a circular shape has been described, but the present invention is not limited to this. You can.

Furthermore, there may be three or more planar windings 12,13.

〔Effect of the invention〕

As explained above, the present invention provides conductive terminals that are electrically connected to the center portions of the spirals of a plurality of planar windings on the core member interposed between the center portions of the spirals. The positioning between the conductive terminal and the conductive terminal can be easily and accurately performed.

For this reason, it is possible to both simplify and ensure fixing such as welding between the center part of the spiral and the conductive terminal, and to reduce costs by improving the workability of the fixing work. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the planar inductance element according to the present invention, FIG. 2 is a perspective view of the core ring shown in FIG. 1, and FIG. FIG. 4 is a perspective view of another embodiment of the present invention, FIG. 5 is a perspective view showing a modification of the core ring of each of the embodiments, and FIGS. 6 and 7 are perspective views of a conventional example. 11... Planar inductance element, 12.13...
Planar windings, 12a, 13a... spiral central end, 14
... Core ring, 15... Conductive terminal. Applicant's agent Hisashi Hatano Figure 1i4rs Layer 5a Figure 6I:l. Figure 7

Claims (1)

[Claims] A plurality of planar windings forming a conductor in a spiral shape are arranged facing each other, and a core member made of an electrical insulator is interposed between the spiral centers of these planar windings, and this core member has a plurality of planar 1. A planar inductance element comprising a conductive terminal electrically connected to the spiral center of a shaped winding.