JPS6292400A - Insulated conductor foil and manufacture of the same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an insulated conductor foil suitable as an electromagnetic wave shield for various electrical and electronic devices.

Conventional Technology When using an insulated conductor foil as an electromagnetic shield, a part of the insulating layer applied to the surface of the insulated conductor foil is peeled off to expose the conductor foil, and a ground wire is soldered to that part. By the way, in this case, it is necessary to remove the insulating layer to the minimum size to prevent short-circuit accidents, but this work is not only troublesome, but the size and degree of peeling varies, making it difficult to remove the insulation layer. There is a problem of variations in characteristics.

Problems to be Solved The present invention aims to solve the problems by providing an insulated conductor foil that does not require insulation peeling and removal for soldering a ground wire and has good insulation properties, and a method for manufacturing the same. The present invention provides a wA edge conductor foil having at least one small non-insulated portion for soldering wires, particularly a circular small non-insulated portion having a diameter of one dragon or less or a small non-insulated portion of an irregular shape having approximately the same area as the circular shape. , or a long insulated conductor foil having the above-described small non-insulated portions of a constant size at regular intervals, and a method for manufacturing the same.

Function: Since the insulated conductor foil of the present invention is provided with a small non-insulated part for soldering wires in advance, the part of the insulating layer that is conventionally done as a pre-process for soldering the ground cotton. There is no need for peeling removal work, and the soldering work becomes easier. In particular, by setting the size of the non-insulated portion to an area of about 1 ms or less in diameter, the electromagnetic shielding function can be achieved without actually causing a short circuit accident. Also, a long insulated conductor foil has small non-insulated portions of a certain size at regular intervals.

By cutting and using it, it is possible to produce insulated conductor foil pieces, which are one embodiment of the present invention, in large quantities and with minimal quality variations.

Furthermore, by the manufacturing method of the present invention in which an insulating layer is formed by masking, applying an insulating varnish, and baking, an insulating layer having small non-insulating parts of any size at regular intervals is continuously formed on a conductive foil. Therefore, continuous production of the long insulated conductor foil described above is realized.

Embodiment FIGS. 1 and 2 are explanatory diagrams of the manufacturing method of the present invention, and FIGS. 3 and 4 are top views of the insulated conductor foil of the present invention.

First, FIG. 1 and FIG. 2 will be explained. A conductive metal such as copper, aluminum, nickel, iron, silver, gold, etc. is sent out from the sending drum 1.

The surface of the long cylinder 2 is cleaned by washing with an organic solvent, an aqueous caustic solution, etc. in a cleaning bag W3.
Next, in the screen printing device 4, resist ink,
Portions to be non-insulated are masked by a known method using an ultraviolet curing mask or the like. FIG. 2 shows the state of masking, in which a large number of circular maskings 21 are placed at regular intervals in the center of the long tube 2. Both surfaces of the masked long cylinder are electrodeposited with an insulating face in the electrodeposited layer M5, the electrodeposited layer is baked in a baking furnace 6 to become an insulating layer 22, and the masking 21 is peeled off and removed in a peeling device 7. be done. In this way, a long insulated conductor foil 2'' having small circular non-insulated portions at regular intervals as shown in FIG.
It is wound up. Alternatively, it is supplied to the cutting machine 9 without going to the two-winding drum, and is cut at regular intervals to be processed into an insulated conductor foil piece having one non-insulated portion 21 as shown in FIG.

In order to improve the adhesion of the electrodeposited insulating layer 22 to the conductor surface, a conductor foil 2 having many irregularities on the surface, such as electrolytic copper foil, is used, or the foil surface is coated at an appropriate stage before electrodeposition. It is advisable to appropriately roughen the surface using a polishing means such as a polishing roll. The insulating layer may be formed by mechanical application and baking of an insulating face, and the surface thereof may also be roughened in advance in the same manner as described above. Furthermore, when it is necessary to increase the withstand voltage characteristics of the electrodeposited insulating layer 22, it is preferable to treat the electrodeposited layer with an organic solvent such as dimethylformamide or high-temperature water vapor after electrodeposition, and then bake it. .

Example A second coat of rolled copper foil with a width of 100 m and a thickness of 18 μm was applied using resist ink (NAZ-DAR's 205 Blue).
10 circular masking with a diameter of 1.0fi as shown in the figure.
The copper foil is screen printed every m and then the copper foil is coated with acrylic.
Epoxy electrodeposited varnish (Ryoden Kasei's V3Si-20)
Electrodeposition was carried out continuously using Thereafter, the masking was dissolved and removed using acetone, thus obtaining a long insulating copper foil having circular non-insulating portions with a diameter IN every 10 m.

Effects The large number of insulated conductor foil pieces cut from the long body obtained in the above example all have small non-insulated parts of a certain size at certain places, so it is difficult to connect the ground wire to that part. Soldering is extremely easy, and the soldering process can be automated if necessary. Moreover, the small non-insulated part mentioned above.

Since the size is only necessary for soldering, it does not actually have an adverse effect on the electrical characteristics of the insulating layer as a whole. Therefore 3
The insulated conductor foil of the present invention is extremely useful as an electromagnetic shielding material for flexible printed circuit board circuits.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of an embodiment of the manufacturing method of the present invention, and FIGS. 3 and 4 are top views of the insulated conductor foil of the embodiment of the present invention. 1 ; Delivery drum 2 ; Conductive metal long foil 21 ; Masking 22 ; Insulating layer 2''; Insulated conductor foil 3 ; Cleaning device 4 ; Screen printing device 5 ; Electrodeposition device 6 ; Baking furnace 7 ; Masking peeling device 8 ; Winding roll 9 ; Cutting machine

Claims (1)

[Claims] 1. An insulated conductor foil characterized by having at least one small non-insulated portion for soldering a wire. 2. The insulated conductor foil according to claim 1, wherein the small non-insulated portion is a circle with a diameter of 1 mm or less or a modified shape having approximately the same area as the circle. 3. The insulated conductor foil according to claims 1 and 2, wherein the conductor foil is long and has small non-insulated portions of a constant size at regular intervals. 4. A process of masking small areas at regular intervals on at least one side of the long conductor foil to be insulated, and continuously coating at least the masked side of the long conductor foil with insulating varnish and baking it. 1. A method for producing an insulated conductor foil, comprising the steps of insulating the foil and removing masking.