JP2526661Y2 - Sealed structure of case for electric parts - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an improvement in the sealing structure of a case for electric parts, in which various electric parts arranged on a base are covered with a case, and the open end of the case and the base are sealed by ultrasonic welding. It is about.

[0002]

2. Description of the Related Art Conventionally, as this kind of technology, for example,
There are techniques related to Japanese Patent Publication No. 55-7687 and Japanese Utility Model Publication No. 57-72537. In these conventional techniques, an electric component including a capacitor and an electromagnetic relay is disposed on a lid or a substrate, and further covered with a case or the like and hermetically sealed by ultrasonic welding.

[0003]

The case and the like are often fixed to another mounting member by a bracket or the like. However, in the above-mentioned conventional technique, when the transmission horn for transmitting ultrasonic vibration is inserted into the case, a part of the open end of the case cannot be welded by bypassing the bracket portion, and the case is completely sealed. There is a problem that can not be. The present invention has been devised in view of the above problems, and has as its object to completely seal the case and the substrate by ultrasonic welding even when a case mounting bracket is provided.

[0004]

According to the present invention, in order to achieve the above object, an electric component disposed on a base is covered with a case,
In a sealed structure of an electric component case in which an opening end of the case and the base are hermetically sealed by ultrasonic welding, the case includes a fitting protrusion for fitting the case mounting bracket; The portion has a stepped portion that comes into contact with the transmission horn for ultrasonic welding.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment according to 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 hermetically seals the open 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 has a pair of guide portions 3c, 3c for projecting the bracket 4 from the direction of the arrow B in FIG. The bracket 4 fixes 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 guides 3c. A step 3e is formed at the upper end of the fitting projection 3d. The case 3 has a peripheral step 3f formed on the outer peripheral surface.

In order to perform ultrasonic welding, first, the electric component 2
The case 3 is placed on the base 1 on which is disposed. Next, the base 1 is supported by the receiving mold 5 of the ultrasonic welding machine. Thereafter, the transmission horn 6 of the ultrasonic welding machine is put on the case 3. Thus, in the state shown in FIG. 2, the step 3e of the case 3 and the peripheral step 3
f is in contact with the transmission horn 6. Therefore, the ultrasonic vibration applied from the transmission horn 6 is transmitted through the case 3,
The opening end portion 3a and the end surface peripheral edge portion 1a collide on the entire peripheral contact surface, and the two are heated and welded.

[0007]

According to the structure of the present invention, as described in detail above, the entire periphery between the base for the electric component and the base, in which the case mounting bracket is fitted, is completely sealed by ultrasonic welding. Can be.

[Brief description of the 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 type is combined in the cross-sectional configuration taken along the line AA of FIG. 1;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Electric component 3 Case 3a Open end 3d Fitting protrusion 3e Step 4 Bracket 5 Receiving mold 6 Transmission horn

Claims (1)

(57) [Scope of request for utility model registration] 1. A closed structure for an electrical component case in which an electrical component provided on a base is covered with a case, and an opening end of the case and the base are sealed by ultrasonic welding, wherein the case is attached to the case. A sealing structure for an electrical component case, comprising: a fitting protrusion for fitting a bracket for fitting; and the fitting protrusion includes a step portion that comes into contact with a transmission horn for ultrasonic welding.