JP3090906B2 - Manufacturing method of annular printed coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an annular printed coil. The annular printed coil obtained by the present invention is used in industrial fields such as an inductance element, an antenna, a solenoid coil, and a motor coil.

[0002]

2. Description of the Related Art An example of an annular print coil is an annular print coil as shown in FIG. To obtain this annular printed coil, the insulating plate 1
In addition, it is necessary to form a large number of through holes 20 in two rows of an annular shape (an inner ring and an outer ring), and to form the conductor film 6 on the entire inner surface of the through hole 20 by through hole plating.

[0003]

However, according to the above-mentioned method, it takes time to form a large number of through-holes based on a predetermined arrangement and to plate through-holes in order to obtain one annular printed coil. . In addition, even if individual annular print coils are cut out from a print coil sheet in which a plurality of annular print coils are formed on one insulating plate, the periphery of each annular print coil must be cut off, and cutting is troublesome. Cost. Further, the annular printed coil obtained by the above-described method can
Since the distance between them cannot be smaller than the diameter of the through hole, there is also a problem that the length of the coil is limited.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a manufacturing method capable of obtaining an annular printed coil extremely easily without any trouble.

Another object of the present invention is to provide a method of manufacturing an annular printed coil which can reduce the distance between adjacent conductive films and can increase the length of the coil.

[0006]

In order to achieve the above object, a method for manufacturing an annular printed coil according to the present invention has the following configuration.

That is, by providing a plurality of annular line-segment holes and a plurality of center holes surrounded by the annular line-segment holes in the insulating plate, a plurality of portions surrounded by the annular line-segment holes and the central hole are provided. Forming annular islands, spirally forming conductive films on both sides and side surfaces around the annular portion of each annular island, manufacturing a plurality of annular printed coils, and cutting each annular island from the insulating plate Thus, a plurality of annular printed coils are obtained.

Further, in the above-described method for manufacturing an annular printed coil, the center hole may be circular, and the outer periphery of the annular portion of the annular island may be concentric with the center hole.

Further, in the above-described method of manufacturing a ring-shaped printed coil, the center hole may be a polygon, and the outer periphery of the ring portion of the ring-shaped island may be a polygon similar to the center hole.

[0010] In the method of manufacturing the annular print coil, the width of the conductor print coil may be equal or unequal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing an annular printed coil according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 and FIG. 2 are perspective views of a main part showing an embodiment of a method of manufacturing an annular printed coil according to the present invention. FIG. 3 and FIG. 4 are perspective views of the annular print coil cut from the print coil sheet shown in FIG. 1 and FIG.

In the drawing, 1 is an insulating plate, 2 is an annular line segment hole, 3 is a center hole, 4 is an annular island, 5 is an annular portion, 6 is a conductor film, 7 is a connecting portion, 8 is a terminal, and P is an annular portion. 3 shows a print coil.

1 and 2, the insulating plate 1 is provided with a plurality of annular line-segment holes 2 and a plurality of center holes 3 surrounded by the annular line-segment holes 2, so that the annular line-segment holes 2 and the center are formed. A plurality of annular islands 4 each formed of a portion surrounded by the hole 3 are formed. A plurality of annular printed coils P are formed by spirally forming conductive films 6 on both sides and side surfaces of the annular portion 5 of each annular island 4 as an axis.

Examples of the insulating plate 1 include a paper base phenol resin, a paper base epoxy resin, a synthetic fiber cloth base epoxy resin, a glass cloth / paper composite base epoxy resin, a glass cloth / glass nonwoven composite base epoxy. Laminated board of resin, glass cloth base epoxy resin, glass cloth base Teflon resin, polyetherimide resin, polysulfone resin, polyethersulfone resin, benzocyclobutene resin,
A resin having insulating properties on both surfaces such as a resin such as a Teflon resin, a ceramic such as aluminum nitride, silicon carbide, and alumina can be used. In addition, the form of the insulating plate 1 may be any of a plate shape, a sheet shape, and a film shape.

The annular island 4 has a portion sandwiched between the annular line segment hole 2 and the center hole 3 surrounded by the annular line segment hole 2, and includes an annular portion 5 and a connecting portion 7. As an example of the annular island 4, there is one in which the center hole 3 is circular and the outer periphery is concentric with the center hole 3 (see FIG. 1).
As another example of the annular island 4, there is one in which the center hole 3 is a polygon and the outer periphery of the annular island 4 is a polygon similar to the center hole 3 (see FIG. 2).

The size of the annular line segment hole 2 and the central hole 3 and the size of the annular island 4 formed by these are not particularly limited, and may be appropriately selected according to the application.

As a method of forming the annular line segment hole 2 and the center hole 3, there are a press working method, a router working method, a laser working method, an NC drill working method and the like.

The conductor film 6 can be formed by various methods. As an example, there is a method of forming a conductive film 6 by forming a plating resist layer on a portion other than a portion to be left as the conductive film 6 on both surfaces and side surfaces of the annular island 4, and then performing plating. Also, as another example,
After the conductive film is formed on both sides and side surfaces of the annular island 4, unnecessary portions are removed by irradiation with a laser beam or the like,
There is a method of forming the conductor film 6 by forming an etching resist layer on a portion to be left as the conductor film 6 and then removing unnecessary portions by etching.

The material of the conductor film 6 may be any material having conductivity, and examples thereof include metals such as copper, nickel, and gold.

The width of the conductive film 6 is not particularly limited, but usually, about 0.05 mm to 1 mm is sufficient.
In addition, the width of the conductive film 6 is not limited to the case where the width is equal over the whole, and may be unequal.

The thickness of the conductive film 6 is not particularly limited, but usually, 3 μm to 50 μm is sufficient.

The number of turns of the conductor film 6, that is, the number of turns of the coil is selected according to the use of the printed coil.

Note that a surface treatment may be performed on part or all of the conductor film 6. As a surface treatment method in this case, there are a solder labeler, gold plating, solder plating, nickel plating and the like.

Further, the conductor film 6 other than the portion to be the terminal 8 of the printed coil may be subjected to insulation treatment with a solder resist. Examples of the solder resist material include epoxy resin, varnish, and enamel. Examples of the method for forming the solder resist include a screen printing method, a roll coater method, a curtain coater method, a spray method, and an electrostatic coating method.

Using the printed coil sheet, an annular printed coil can be obtained only by cutting each annular island 4 from the insulating plate 1. The cutting position is not particularly limited, and the connecting portion 7 may follow the annular print side (see FIG. 3) or the connecting portion 7 may remain on the insulating plate 1 side (see FIG. 4).

Examples of the cutting method include a punching press method, a router method, a laser cut method, a V-cut method, a cutting method, and the like.

The annular printed coil P obtained according to the present invention may be used as it is as an annular printed coil, or may be used as a printed wiring board by forming another circuit on the annular printed coil.

[0029]

Example 1 A copper-clad laminate of 340 mm long and 255 mm wide, in which a copper foil having a thickness of 18 μm was stretched on the front and back surfaces of an insulating plate 1 (glass cloth base epoxy resin manufactured by Matsushita Electric Works) having a thickness of 0.2 mm Prepare a board, 5mm inside diameter to penetrate this board by router processing
The central hole 3 was formed, and the annular line segment hole 2 having a width of 1 mm concentric with the central hole 3 was formed so that the annular portion of the annular island 4 had a width of 6 mm. The width of the connecting portion was 2 mm. On one insulating plate 1, 284 circular islands 4 are produced vertically, 16 laterally, and 284 at a pitch of 15 mm.
Thick copper plating is formed, and an etching resist that matches the conductive film 6 is formed with the width of the conductive film 6 being 0.2 mm and the pitch at the inner diameter portion within the circle being 0.45 mm, with the annular portion 5 of the annular island 4 as an axis. Then, unnecessary portions were removed by etching with ferric chloride, and then the etching resist was peeled off to obtain a conductor film 6. Also, the terminals at the beginning and end of the coil are connected to the connecting portion 7 on the same plane with a diameter of 0.5 mm.
And formed by etching. Furthermore, after covering the terminal portion of the coil other than the copper foil portion with a solder resist, the connecting portion was cut with a press to obtain 294 annular printed coils.

[0030]

The method of manufacturing a ring-shaped printed coil according to the present invention has the above-described structure, and therefore has the following effects.

That is, the method of manufacturing an annular printed coil according to the present invention requires a plurality of annular printed coils by using a printed coil sheet and cutting each annular island from an insulating plate, thereby requiring time and effort. An annular printed coil can be obtained very easily without any problems.

Further, since the annular printed coil obtained by the present invention is obtained from the printed coil sheet, the distance between adjacent conductive films can be reduced, and the length of the conductive film can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view of an essential part showing one embodiment of a manufacturing method of the present invention.

FIG. 2 is a perspective view of an essential part showing one embodiment of the manufacturing method of the present invention.

FIG. 3 is a perspective view of an annular print coil cut from the print coil sheet shown in FIG.

FIG. 4 is a perspective view of an annular print coil cut from the print coil sheet shown in FIG. 2;

FIG. 5 is a plan view showing an example of a conceivable annular printed coil.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 insulating plate 2 annular line segment hole 3 center hole 4 annular island 5 annular portion 6 conductive film 7 connecting portion 8 terminal P annular print coil

Claims (5)

(57) [Claims] 1. An insulating plate comprising a plurality of annular line-segment holes and a plurality of center holes surrounded by the annular line-segment holes, thereby forming a plurality of portions surrounded by the annular line-segment holes and the central hole. Forming annular islands, spirally forming conductive films on both sides and side surfaces around the annular portion of each annular island, manufacturing a plurality of annular printed coils, and cutting each annular island from the insulating plate A method for producing a plurality of annular printed coils. 2. The method of manufacturing an annular printed coil according to claim 1, wherein the center hole is circular, and an outer periphery of the annular portion of the annular island is concentric with the center hole. 3. The center hole is a polygon, and the outer periphery of the annular portion of the annular island is a polygon similar to the center hole.
3. The method for producing an annular printed coil according to item 1. 4. The method according to claim 1, wherein the width of the conductor film is equal. 5. The conductive film according to claim 1, wherein the width of the conductive film is unequal.
A method for manufacturing an annular printed coil according to claim 3.