JPH01287903A - Laminated type sheet coil - Google Patents

Abstract

PURPOSE:To contrive improvement in the connecting property between the outer end parts of each sheet coil section by a method wherein a junction conducting part, to be used for connection, is provided on the outer end part of the sheet coil sections. CONSTITUTION:The title sheet coil is composed of a sheet-like base part 1, having flexibility and electric insulating property and folded up in a laminated state, sheet coil parts 3 and 5, a junction conducting part 8 formed on each external end part of two sheet coil sections 3 and 3 or 5 and 5 which are adjacently positioned on the same surface side of a substrate 1, and an insulating film part 9. Each external end part of the two sheet coil parts 3 and 5, which are positioned adjacent to each other on the same surface of the substrate 1, are connected by the junction-conducting part 8, and the connecting property between said external end parts is secured by the junction conducting part 8 without having the faulty connection such as disconnection of wire. As a result, the improvement in the connecting property between external end parts of the sheet coil parts 3 and 5 can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a laminated sheet coil formed by folding a sheet-like base portion having a plurality of spiral sheet coil portions. The laminated sheet coil of the present invention can be applied to, for example, motors and ignition coils.

[Conventional technology]

The plan view of the conventional laminated sheet coil before folding is shown in Figure 8.
FIG. 9 is a perspective view of a somewhat folded state before lamination.

This laminated sheet coil has a flexible and electrically insulating sheet-like base 1 and a first part 1A of the base 1. 9 spiral seams 1-71 ile part 3 and base 1
A plurality of spiral seams disposed on the second surface 1B of the coil part 5 and two adjacent seams f= on the same surface side of the base 1
Each outer end 3Δ of the coil part 3.3 (ma/8=is 5.5)
, 3A (or 5A and 15A), and a jumper wire 7 that electrically connects the wires 1 and 1. The base 1 is bent and laminated by bending the base 1 at the base 11. In addition, the sheet coil l1j33.5 and the jumper wire 7 are conductor patterns formed in the same manufacturing process, and the sheet coil l1j33.5
The surface of the jumper wire 7 is coated with insulation. The base 1 has a through hole 10 formed by plating or the like, and the inner ends of the two seams 1 to 3.5 concentrically facing each other with the base 1 in between are connected to the through hole 10. Makes an electrical connection.

[Problems that need to be solved] In the conventional laminated sea coil in which the jumper wire 7 is used to connect the seal and fill parts 3.5, the jumper wire 7 is folded over the base 1 and the laminated part 3.5 is folded over. At the bend, the section 11i 1m 1. , there was a possibility of high resistance or disconnection.

Kinai II was created in view of the above-mentioned issues,
Our aim is to provide a laminated sheet coil with improved connectivity between the outer ends of each sheet and coil section.

Means for Solving Problems with L Problems] The laminated sheet coil of the first invention includes a folded sheet-like base having flexibility and electrical insulation, and a layer of η in the folded state of the base. a plurality of spiral sheet coil parts disposed on at least one surface of the base so as to form a spear; and a plurality of spiral sheet coil parts that are joined to each other in a folded state of the base.
It is composed of a joint conductive part that is integrally disposed at the outer end of the sheet coil part so as to have an opening, and a thin insulating film part that insulates the surface of the sheet coil part.

The WA layer pear-shaped Sea 1 coil of the second invention includes a folded sheet-like base made of flexible bamboo and electrically insulating properties, and at least one side of the base so that the bases overlap with each other in the folded state. The insulation film includes a plurality of spiral sheet/fill portions disposed in the sheet coil portion, and an insulating film portion in the same layer that insulates the surface of the sheet coil portion except for the outer part of the sheet coil portion. A joint conductive part made of low melting point metal or inner metal, which is formed by plating on the outer end of the sheet coil part that is not covered with the membrane part and integrally joined to each other with the base part folded over. It is constructed from f'Ijt.

As the base, resin materials such as C1 polyimide film and polynisdel film can be used.

A conductive pattern formed by the 1-no-disk method, the transfer method, or the like can be used as the sheet tile portion.

A coated or pasted wood film or the like can be used as the insulating R part.

The junction conduction portion connects two adjacent seams 1-1 on the same surface of the base.
This is a conductive member that connects the six outer ends of the fill section. In addition, it is also possible to connect each of the outer ends in parallel with both the junction conduction part according to the present invention and the conventional dimber wire, and in this case, each of the outer ends can be connected more reliably. ' can be done. Note that the junction conductive portion of the first invention may be formed in the same process as the seal-fill portion, or may be formed separately. Further, in the second invention, at least the surface portion of the joint conductive portion is formed by plating with a low melting point metal material such as solder or gold or a gate metal material.

[Function] In the laminated sealed L-coil of the first invention, the junction conductive portion connects the outer ends of two adjacent sheet coil portions at the same base, and connects the conventional jumper wire to the right side. [I
To ensure connectivity at the outer end without problems due to connection failures such as i-line.

In the laminated sheet coil of the second invention, electrodes are formed on each exposed outer end of the sheet coil portion in the joint conductive portion by plating with precious metal or G1 melting metal, and the electrodes are not corroded by oxidation. to ensure stable connectivity between the outer ends. , In addition, the insulating section 9' of the sheet coil section, excluding the end section, is folded and stacked! In this state, two adjacent sheet coil portions are electrically insulated, and furthermore, this insulating film portion acts as a mask when plating a junction conductive portion on the outer end portion of the sheet coil.

[Example] Example 1 An example of the laminated sheet coil of the first invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing the laminated sheet coil of this example in a somewhat bent state before lamination, Fig. 2 is a partially enlarged sectional view thereof, and Fig. 3 is a partially enlarged sectional view after lamination. , FIG. 4 is a partial sectional view of the laminated sheet coil of FIG. 1 after lamination. Note that in this specification, components with the same function are denoted by the same reference numerals throughout the drawings.

This laminated sheet coil has a sheet-like base 1 which has flexibility and electrical insulation properties and is folded in a laminated state.
, a plurality of 11m% wound sheet coil portions 3 disposed on the first surface 1A of the base 1, and a plurality of spiral sheet coil portions 5 disposed on the second surface 1B of the base 1, The joint conductive portion 8 formed at each outer end of the sheet coil portion 3.3 (or 5.5) of the adjacent sheet coil portion 3.3 (or 5.5) on the same side of the base 1, and the sheet coil portion 3.5 and the joint conductive portion 8 are connected to each other. It consists of a thin insulating film portion 9 that insulates and insulates the first surface 1A and second surface 1B of the base 1.

The base 1 is a polyester film having a thickness of about 15 μm, and has through holes 10 formed at predetermined positions. A copper plating film 10A (see FIG. 4) is formed on the surface of the through hole 10 by electroless plating.

The sheet coil portion 3.5 is formed by a transfer method and has a thickness of approximately 25 mm.
It is a copper spiral coil with a thickness of μm and a width of approximately 50 μm. A pair of adjacent sheet coil portions 3.3 have mutually opposite winding directions, and a pair of adjacent sheet coil portions 5.5 have mutually opposite winding directions. Further, the sheet coil portions 3.5 facing away from each other across the base 1 have the same winding direction when viewed in the same direction. 26m facing away from base 1
The inner ends of the sheet coil parts 3 and 5 are connected to each other by copper plating 1110A (see FIG. 4) formed in the through hole 10 of the base 1.

As shown in FIG. 2, the junction conductive part 8 is taller (thicker) than the sheet coil part 3 and the sheet coil part 5.
Furthermore, its tip 8A is formed into a conical shape.

The insulating film portion 9 is a coated epoxy resin film, and on both sides of the base 1, before lamination pressing, the sheet coil portion 3.5 and the bonding conductive portion 8 are insulated, and after lamination pressing, the bonding conductive portion is coated. The sheet coil portion 3.5 except for 8 is insulated (see FIG. 3).

To explain the manufacturing method of this laminated sheet coil, first,
Prepare a pair of opposing molds. Note that an exposed metal surface and another insulating coating surface in a predetermined pattern are formed on each opposing surface of the pair of molds. Copper patterns that will later become the sheet coil portion 3.5 and the junction conductive portion 8 are formed on the pair of exposed metal surfaces by electrolytic copper plating.

Next, a polyester film serving as the base 1 is sandwiched between the opposing surfaces of the pair of molds, and the molds are pressed into a pattern aligned with each other. As a result, each copper pattern is connected to the first surface 1 of the base 1
A and the second surface 1B are transferred and pressed, respectively, to form a sheet coil portion 3.5 and a joint conductive portion 8.

Next, a through hole 1 is placed at the inner end of the sheet coil portion 3.5.
0 and plated the inside of the through hole using electroless Cu plating to provide electrical conductivity between the front and back sides. Then, the laminated sheet coils are folded and laminated in a bellows shape so that the two joint conductive portions 8.8 adjacent to each other on the same plane overlap, and finally pressed from both sides to form the coil.

Note that due to this pressing, the insulating film portion 9 covering the joint conductive portion 8 is pierced by the conical tip portion 8A of the joint conductive portion 8, and the two joint conductive portions 8 facing each other at the same position are pressed together. Ru.

In addition, in FIG. 1, each junction conduction ff8 of the base 1A
Although the positions of T: are described as being almost the same, if two adjacent joint conductive parts 8 can be overlapped by folding, the position of each joint conductive part 8 may be changed.

Further, the shape of the tip of the junction conducting part 8 is not limited to a conical shape, but may be any other shape as long as it can penetrate the insulating film part 9. taR
A film may also be formed.

The laminated sheet coil of this embodiment described above can achieve the above effects.

(a) Each of the two adjacent sheet coil parts of the base 1! Since the A@ part can be connected without using a jumper wire, the J2 jumper wire can be connected to the base 1 folding, which is a problem with conventional laminated sea coils with jumper wires. Connection failures due to distortion or disconnection can be eradicated. J5, it has been proposed in the past to arrange a joint conductive part on the inwardly inclined part of the sheet coil part, but by arranging a joint conductive part on the outside part of the sheet coil part, the jumper It was not known to solve the problem of poor line connections.

(b) In this embodiment, it is not necessary to expose the joint recessed portion 8 from the joint recessed portion 9 before folding the base 1, so that
Manufacturing I-culm becomes much easier.

Example 2 Another example 1 of the laminated seal L-coil of the first RIJ is shown in FIG. 5, which is a partially enlarged cross-sectional view.

This laminated sea 1-coil includes a base 1, a first base 1, etc.
It consists of a sheet fill part (not shown) on the second surface (not shown) side of the base 1, such as the sea 1-coil part 3 on the 1△ side, a junction conductive part 8, etc., and an insulating film part 9, The device is the same as the device of Example 1 except that a recess 9A is provided in the insulating film portion 9 near the junction conduction portion 8.

In the laminated sheet coil of this embodiment, the concave portion 9A is provided in the insulating side portion 9 near the joint conductive portion 8, so that after the laminated sheet coil 1 is folded into a bellows shape and stacked,
When press molding is performed from both sides for 1 no.C, an escape space for the insulating film portion 9 pierced by the tip portion 8A of the joint conductive portion 8 is ensured. For example, as shown in FIG. Even when folded, no gap 100 is formed in the middle.

Example 3 An embodiment of the laminated No. 4 Sea 1-coil of the second invention is shown in FIG. 6, which is a partially enlarged cross-sectional view, and FIG. 7 is a partially enlarged cross-sectional view after lamination. 4゜This laminated sea l-coil consists of a sheet part 1, a sheet fill part 3 on the first surface 1Δ side of the base part 1, and a sheet fill part 3 on the second side (tf in the figure) of the base part 1.
- Consists of a coil part (not shown), a junction conduction part 8, and an insulating film part 9, and the junction conduction part 8 is completely disconnected before the treetop battle! l I
The device is the same as the device of Example 1 except that it is exposed from 9, has gold plating 8G on the surface, and has a sharp tip shape.

The laminated sheet of this embodiment has a copper electrode part taller (thicker) than the coil part, and the junction conductive part 8 is formed on both sides of the base part 1. 8B and
The exposed flat surface of the copper 11 electrode 8M18B (r consists of a gold plated film 8C formed by electroless plating method, etc.).

According to this embodiment, since the gold plating film 8C is formed on the surface of the copper electrode part 813, a lifting platform is used to fold and press the laminated sheet 1-coil and press the two joint conductive parts 8. In addition, the gold plating 1ψ8C adheres firmly to υ, reducing the contact resistance to a minimum. Also, it is useful for preventing melting of the contact surface.

Furthermore, according to the method for manufacturing the gold plating film 8Ca of this example,
Using the insulating film part 9 for insulating the sea 1-coil part 3 from other sea me coil parts, the copper electrode part 8 is selectively connected.
In addition to being able to perform electroless plating on the surface of the copper electrode portion 8B, there is an advantage that no special mask is required to form the gold plating film 8C only on the surface of the copper electrode portion 8B.

In addition to the above-mentioned gold plating film 8C, 6 metal materials such as (,,'', 80, etc.) and
It is also possible to perform plating using any low melting I-gold material.

Further, in the present embodiment 1, the pressure weldability can be improved by sharpening the tip of the joint S recessed portion 8.

Furthermore, - the above-mentioned Example 1 and T'f3, Maroku: are the above-mentioned actual M1.
Embodiments in which Examples 2 and 3 are carried out simultaneously are also possible.

The embodiments described above are also applicable to the case where a sheet coil portion is provided on one side of the base at the same time. .

[Effect of the invention] As explained above, the laminated sheet coil of the first invention has the following effects:
The outer end of the sheet coil part has a joint conductive part for connection. Therefore, the outer ends of two adjacent sheet coil parts on the same surface of the base 1 can be connected without using jumper wires.
It is possible to eliminate connection failures caused by strain and breakage of jumper wires due to folding of the base, which are problems with conventional laminated sheet coils having jumper wires.

Further, the laminated sheet coil of the second invention has a joint conductive portion formed at least in part by plating a low melting point metal material or a noble metal material at the outer end of the sheet coil portion, so that the manufacturing process is simple. A reliable outer end connection can be made with

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a laminated sheet coil according to an embodiment of the first invention in a somewhat bent state before lamination, FIG. FIG. 4 is a partially enlarged cross-sectional view of the laminated sheet coil of FIG. 1 after lamination. FIG. 5 is a partially enlarged sectional view showing another embodiment of the laminated sheet coil of the first invention. FIG. 6 is a partially enlarged sectional view showing an embodiment of the laminated sheet coil of the second invention, and FIG. 7 is a partially enlarged sectional view after lamination. Fig. 8 is a plan view of a conventional laminated sheet coil before it is folded, and Fig. 9 is a perspective view of the conventional laminated sheet coil before it is folded. 1...Base 3.5...・Sheet coil part 8
...Junction conductive part 9...Insulating film part Patent applicant
Japan Nso Co., Ltd.

Claims (2)

[Claims] (1) A folded sheet-like base having flexibility and electrical insulation properties, and a plurality of spiral-shaped bases arranged on at least one side of the base so as to overlap each other in the folded state. a sheet coil portion; a joint conductive portion integrally disposed at an outer end portion of the sheet coil portion so as to be joined to each other in a state in which the base portions are folded; and an insulating coating on a surface of the sheet coil portion. A laminated sheet coil characterized by comprising a thin insulating film portion. (2) A folded sheet-like base having flexibility and electrical insulation properties, and a plurality of spiral-shaped bases arranged on at least one side of the base so as to overlap each other in the folded state. a sheet coil portion; a thin layered insulating film portion that insulates the surface of the sheet coil portion except for an outer end portion of the sheet coil portion; and an outer end portion of the sheet coil portion that is not covered with the insulating film portion. 1. A laminated sheet coil comprising: a low melting point metal or noble metal joint conductive portion formed by plating on the base portion and integrally joined to each other in a folded state.