JPH01272195A - Manufacture of sealed container - Google Patents

Abstract

PURPOSE:To enable a case body to be united with a cover in a short period of time and sealed completely by joining the body and the cover at their peripheries and applying a laser beam to the joint faces at a predetermined angle so that the peripheries are cut off and the residual part is molten to seal the body and the base together. CONSTITUTION:A continuous joint flange 3 is formed on the outer periphery of a base 1 such that the flange extends transversely. A similar continuous joint flange 4 is provided also on the outer periphery of the opening of a base 2. The base 1 and the case 2 both formed of a synthetic resin are combined while the joint flanges 3 and 4 are put together. A laser beam L is applied continuously for a short period of time at an approximately right angle to the joint interface 5 so that the ends 6 of the flanges located outside of a cutting face 7 are cut off by the laser beam. The cutting face 7 is molten by the heat of the laser beam L, whereby the base 1 is united with the case 2 while any gap therebetween is sealed up. Since application of laser is finished in a short period of time, the container is not exposed to much heat and an electronic component or the like contained therein is not effected adversely.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a closed container comprising a main body and a lid made of synthetic resin.

(Prior Art) Conventionally, various components, such as electromagnetic relays, are housed in a housing (container) consisting of a base and a case made of synthetic resin, and adhesive is attached to the joint surface of the base and case. It is provided that the area is sealed by applying an agent.

(Problem B to be solved by the invention) However, epoxy-based adhesives are generally used as the adhesive, and after applying this type of adhesive, it is necessary to heat it for a predetermined period of time or more to cure it. For,
It has the following problems.

That is, two processes are required: a process of applying the adhesive and a process of curing the adhesive, and it also takes a long time to cure the adhesive, resulting in poor production efficiency.

Moreover, if the heating temperature is increased, it will have an adverse effect on the built-in electronic components. For this reason, if the heating temperature is suppressed, the curing time becomes longer, and if the product is placed in a constant temperature bath to suppress the temperature rise, the continuous production line is interrupted and productivity decreases.

Furthermore, when using an ultraviolet curing type adhesive, the adhesive that enters the areas not exposed to ultraviolet rays remains uncured and flows into the contact area, causing contact failure.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and will be explained with reference to FIG. 1 showing one embodiment. (1) and the lid body (case) 2 are joined at their peripheral edges 3, 4, and a laser L is irradiated at a predetermined angle to the joining surface 5, and the peripheral edges 3, 4 are irradiated along the locus of the laser L. At the same time, the laser irradiation part 7 is melted to seal the main body 1 and the lid 2.

(Example) The present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a cross section of an electrical device before completion, which is composed of a base 1 as a main body and a case 2 as a lid. Both the base 1 and the case 2 are made of synthetic resin, and the outer periphery of the base 1 A joining flange 3 is formed continuously toward the side, and a joining flange 4 is also formed at the outer periphery of the opening of the case 2 toward the side. Note that various parts housed in the container are omitted from the drawings.

As shown in the figure, the base l and the case 2 are combined with their respective joint flanges 3.4, and the laser L is irradiated from a substantially perpendicular direction to the joint surfaces 5 of the joint flanges 3 and 4, as shown by the dotted line. The end portion 6 outside the cut surface 7 shown by is cut off and removed to complete the electrical device shown in FIG. 2. Note that the laser irradiation is performed continuously and in a short time.

In the method for manufacturing an electrical device, the cut surface 7 is melted by the heat of the laser L, the base 1 and the case 2 are melted and integrated at the intersection of the cut surface 7 and the joint surface 5, and the gap between the two is sealed. be done.

Figures 3 and 4 show other embodiments of the present invention, and in Figure 3, which shows a cross section of the electric device before completion, the base 11 is inserted into the opening of the case 12, and the joint surface 13 of the two is in the vertical direction. suitable for

Then, the laser beam is projected obliquely onto the bonding surface 13, and the portion located outside of the cutting surface 14 shown by the dotted line is removed to complete the electrical device shown in FIG. 4. Further, the base 11 and the case 12 are melted and integrated at the intersection of the cut surface 14 and the joint surface 13, and the gap therebetween is sealed.

(Effects of the Invention) As is clear from the above explanation, according to the method for manufacturing a closed container according to the present invention, the main body and the lid can be integrated in a short time in one process of laser irradiation, and in addition, Since the joint surfaces of the two can be sealed, manufacturing can be simplified and productivity can be improved.

Furthermore, since the laser irradiation is completed continuously and in a short period of time, the heat capacity imparted to the container is small, and there is no possibility that it will adversely affect electronic components etc. that are built-in.

[Brief explanation of the drawing]

1st. 2 is a sectional view of the sealed container of the first embodiment, FIG. 1 shows the sealed container before sealing, FIG. 2 shows the sealed container after sealing, FIG. 3-4 is a sectional view of the sealed container of the second embodiment, and FIG. shows before sealing, and Fig. 4 shows after sealing. 1...Base (main body), 2...Case (lid main body),
3.4...Joint 7 lange, 5.13...Joint surface, 7
．． 14... Cutting surface, L... Laser.

Claims (1)

[Claims] (1) A main body and a lid made of synthetic resin are joined at their peripheral edges, a laser beam is irradiated onto the joint surface at a predetermined angle, the peripheral edge is cut along the trajectory of the laser, and the laser A method for manufacturing an airtight container, characterized by melting an irradiation part and sealing a main body and a lid.