JP2002171088A - Method for coating with shielding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem, where in order to eliminate excess or insufficiently of a coating amount when a housing or a board is coated with an electromagnetic wave shielding material, large man-hours is required and further an arbitrary sectional finishing shape cannot be obtained and it is difficult to deal with high density mounting. SOLUTION: A method for coating with the shielding material comprises the steps of contacting a frame, having a groove of an arbitrary shape with an edge of a housing or a board by directing the groove of the frame toward the edge, casting and molding the electromagnetic wave shielding material in a space formed between the housing or the board and the frame, to adhere the material of the arbitrary shape along it. Thus, the closability to the cover or the like can be enhanced to surely execute an electromagnetic wave shield.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying an electromagnetic wave shielding material for preventing leakage of electromagnetic waves from an edge connection portion of a housing or a substrate.

[0002]

2. Description of the Related Art Conventionally, as an example of a method of preventing an electromagnetic wave from leaking from an edge connection portion of a housing or a substrate, there is a method of dispensing an electromagnetic wave shielding material on an upper surface of an edge as shown in FIG. This method uses a syringe 13a of an injector 13 to place a nozzle 1
The electromagnetic wave shielding material 10 is applied through 3b. As the electromagnetic wave shielding material 10, a material obtained by dissolving resin or rubber in an organic solvent and dispersing silver-coated copper fine powder is used.

Further, in order to simplify the assembling work in this method, a method of applying a conductive adhesive instead of the electromagnetic wave shielding material 10 has been proposed (Japanese Patent Laid-Open No. 7-221).
482).

[0004]

In the above-described method of applying the electromagnetic wave shielding material, although the application is performed by accurately positioning the robot, the amount of application does not become excessive or insufficient due to the viscosity of the electromagnetic wave shielding material and the injection pressure. In order to achieve high precision and high-density mounting, it may take a lot of labor to perform fine coating, and it is difficult to respond to high-density mounting because it is not possible to obtain an arbitrary cross-sectional finish shape. There was a point. SUMMARY OF THE INVENTION The present invention provides a method for applying a shield material in order to solve the above-mentioned problems of the conventional technology.

[0005]

To achieve the above object, the present invention is configured as follows. That is, in a method of applying an electromagnetic wave shielding material to an edge of a peripheral wall or a partition in a case or substrate having conductivity, a frame having an arbitrary-shaped groove at an edge of the case or substrate. The electromagnetic wave shielding material is injected and molded into a space formed between the housing or the substrate and the frame body. (Claim 1)

In applying the electromagnetic shielding material, the electromagnetic shielding material is injected from one end of the frame.

When the electromagnetic wave shielding material is applied, the electromagnetic wave shielding material is injected from an opening provided above the frame.

Further, when applying the electromagnetic wave shielding material, the electromagnetic wave shielding material is injected while moving along a groove provided above the frame.

[0009]

According to the above construction, the electromagnetic wave shielding material formed in an arbitrary shape can be made to adhere to the peripheral wall portion of the housing or the substrate or the edge located on the normal upper surface of the partition portion. Enhance the airtightness between the body and the like to ensure electromagnetic shielding. In addition, it is possible to perform fine coating on high-precision, high-density mounting.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to FIGS. The frame body 2 is brought into contact with the peripheral edge of the housing or the partition 1 where the electronic product or the like is incorporated, which is located on the normal upper surface of the partition. The frame 2 has a groove 2a along one surface in the longitudinal direction, and an opening 2 communicating with the other surface from the groove.
b or an open groove 2c. Then, the frame or the substrate 1 is brought into contact with the peripheral wall portion or the edge portion of the partition portion with the one surface having the groove portion 2a of the frame body 2 facing.

At this time, the opening 2b or the opening 2c of the frame 2 is arranged upward, and an electromagnetic wave shielding material connected and supplied from a dispenser (not shown) is supplied into the opening 2b or the groove 3c via the syringe 3a. The injection is performed based on the instruction set by the robot operation. As the electromagnetic wave shielding material, a general material obtained by mixing silver-coated copper powder with silicon rubber or the like dissolved in an organic solvent can be used. Opening 2 of frame 2
b or the electromagnetic wave shielding material injected from the groove 2c is the groove 2a.
Is filled along.

FIG. 1 shows an injection from a fixed position through an opening 2b, and FIG. 2 shows an injection of an electromagnetic shielding material while moving from an opening 2c. FIG. 3 shows an example in which the shape of the groove 2a is changed. Among them, (a) and (b) show the case where the electromagnetic wave shielding material is injected from the opening 2b of FIG. 1 and (c) respectively from the opening 2c of FIG. Is what you do. The injection method may be appropriately selected in consideration of workability and the like. After the injected organic solvent of the electromagnetic wave shielding material evaporates and dries, the frame 2 is removed.

[0013]

According to the above configuration, the present invention provides a peripheral wall portion of a housing or a board or an edge portion which is usually located on an upper surface of a partition portion.
An electromagnetic wave shielding material formed in an arbitrary shape can be adhered, and a high-precision, high-density packaging can be performed with high precision.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a method for applying a shielding agent according to the present invention, in which an opening is provided on an upper surface and injection is performed.

FIG. 2 is a view showing an example of a method of applying a shielding agent according to the present invention, in which a groove is provided on an upper surface and a method of injecting the same while moving.

FIGS. 3A, 3B, and 3C are examples of embodiments showing a groove shape; FIGS.

FIG. 4 is a view showing a method of applying a shielding agent according to a conventional technique.

[Sign]

Reference Signs List 1 housing 2 frame 2a groove 2b opening 2c opening 3 injection device 3a syringe 3c nozzle 10 electromagnetic wave shielding material 11 housing 13 injection device 13a syringe 13b nozzle

Claims (4)

[Claims] 1. A method for applying an electromagnetic wave shielding material to an edge of a peripheral wall or a partition in a case or substrate having conductivity, wherein a groove having an arbitrary shape is formed in the edge of the case or substrate. A method for applying a shield material, comprising: abutting the groove portion of a frame body facing the same, injecting an electromagnetic wave shielding material into a space formed between the housing or the substrate and the frame body, and molding. Wherein upon which the coating wearing the electromagnetic wave shielding material, shielding material the coating method according to claim 1 is intended to inject an electromagnetic wave shielding material from one end of the frame. 3. The method according to claim 1, wherein the step of applying the electromagnetic wave shielding material comprises injecting the electromagnetic wave shielding material from an opening disposed above the frame. 4. The shield material coating according to claim 1, wherein the electromagnetic wave shielding material is applied while moving along an open groove disposed above the frame when applying the electromagnetic wave shielding material. Method.