JPH056877U - Hermetically sealed case for electrical parts - Google Patents

Abstract

(57) [Abstract] [Purpose] Completely seal the entire circumference between the case for electrical parts equipped with the case mounting bracket and the board by ultrasonic welding. [Structure] The base 1 includes various electric components 2. The case 3 covers the electric component 2. The case 3 has a fitting projection 3d formed on the outer surface 3b for fitting with the bracket. The fitting protrusion 3d is provided with a step 3e on the upper surface. The transmission horn 6 of the ultrasonic welding machine has a step 3e in the case 3.
And ultrasonic vibrations are transmitted from the peripheral step portion 3f, and the opening end portion 3
The entire circumference between a and the peripheral edge portion 1a of the end face of the base 1 is heat-welded.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a hermetically sealed structure for an electric component case, in which various electric parts arranged on the base are covered with a case, and the open end of the case and the base are hermetically sealed by ultrasonic welding.

[0002]

[Prior Art]

 Conventionally, as this type of technique, there is, for example, a technique disclosed in Japanese Examined Patent Publication No. 55-7687 or Japanese Utility Model Publication No. 57-72537. In these conventional techniques, an electric component composed of a capacitor and an electromagnetic relay is arranged on a lid or a substrate, and then covered with a case or the like and sealed by ultrasonic welding.

[0003]

[Problems to be solved by the device]

 By the way, the case and the like are often fixed to other mounting members by a bracket or the like. However, in the above conventional technique, when the transmission horn that transmits ultrasonic vibrations is inserted into the case, by bypassing the bracket portion, a part of the open end in the case becomes unweldable. There is a problem that it cannot be completely sealed. The present invention has been made in view of the above problems, and an object thereof is to completely seal a case and a substrate by ultrasonic welding even when a case mounting bracket is provided.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a case in which an electric part disposed on a board is covered with a case, and an open end of the case and the board are hermetically sealed by ultrasonic welding. For the electrical component, the case includes a fitting protrusion into which the case mounting bracket is fitted, and the fitting protrusion includes a step portion that contacts the ultrasonic welding transmission horn. It forms a sealed structure for the case.

[0005]

【Example】

 A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Reference numeral 1 denotes a base, on which various electric components 2 such as an electromagnetic relay are arranged. Reference numeral 3 denotes a case, which covers the electric component 2 and seals the opening end 3a with the peripheral edge 1a of the end face of the base 1. The base 1 and the case 3 are made of a thermoplastic resin such as polypropylene. The case 3 is provided with a pair of guide portions 3c, 3c for inserting the bracket 4 from the direction of the arrow B in FIG. The bracket 4 is for fixing the case 3 to another mounting member (not shown). On the outer side surface 3b, a fitting projection 3d for fitting the fitting hole 4a of the bracket 4 is provided between the guide portions 3c, 3c. A step 3e is formed at the upper end of the fitting protrusion 3d. The case 3 has a peripheral step portion 3f formed on the outer peripheral surface.

To perform ultrasonic welding, first, the case 1 is placed on the base 1 on which the electric component 2 is arranged. Next, the substrate 1 is supported by the receiving mold 5 of the ultrasonic welding machine. Then, the case 3 is covered with the transmission horn 6 of the ultrasonic welding machine. Thus, in the state shown in FIG. 2, the step 3e and the peripheral step 3f of the case 3 are in contact with the transmission horn 6. Therefore, the ultrasonic vibration applied from the transmission horn 6 is transmitted through the case 3 and collides with the contact surface of the entire circumference of the opening end portion 3a and the end face peripheral portion 1a to heat-weld them.

[0007]

[Effect of the device]

 As described in detail above, according to the configuration of the present invention, the entire periphery between the case for electric parts having the configuration for fitting the case mounting bracket and the base can be completely sealed by ultrasonic welding.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a transmission horn receiving mold is combined in the cross-sectional structure taken along the line AA in FIG.

3 is a plan view of the configuration of FIG. 1. FIG.

[Explanation of symbols]

 1 Base 2 Electrical Parts 3 Case 3a Opening End 3d Fitting Projection 3e Step 4 Bracket 5 Receiving 6 Transmission Horn

Claims (1)

[Claims for utility model registration] [Claim 1] In a sealed structure for an electric part case, wherein an electric part arranged on a base is covered with a case, and an opening end of the case and the base are hermetically sealed by ultrasonic welding. The case is provided with a fitting projection into which the case mounting bracket is fitted, and the fitting projection is provided with a step portion that comes into contact with the ultrasonic welding transmission horn. Case sealed structure.