JPH0428129A - Electronic apparatus - Google Patents

Abstract

PURPOSE:To set the operating characteristic of the apparatus in the title unchanged even if it is heated from the outside, and ensure the sealing property of the apparatus by constituting a pass-through hole provided on a housing by means of sealing it with an elastic film for pressure regulation. CONSTITUTION:A pass-through hole 22, which is provided on the side face of a case 18 that forms a housing 19, is sealed with an elastic film 23 for pressure control that is bonded with an adhesive material. Thus, even if a relay and the like is heated from the outside and the gas in the housing 19 is expanded, the elastic film 23 swells out of the pass-through hole 22 so that the internal volume increases. Therefore, the air pressure in the housing 19 is maintained at a constant level so that neither distortion occurs nor residual stress is produced in the housing 19. Thus, since no residual stress is produced, the operating characteristics can not be changed and also the sealing property can be ensured.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to electronic equipment, particularly sealed electronic equipment.

(Prior Art and Problems to be Solved by the Invention) Conventionally, as shown in FIG. 2, in a sealed electronic device, a housing 3 is constructed by fitting a case 2 to a base 1 on which internal components are assembled. After the sealant 4 is injected and solidified for sealing, and the internal gas is removed from the gas vent hole 5 provided in the base l, an inert gas is injected to seal the gas vent hole 5.
There are sealed relays that are heat-sealed.

However, in this relay, the operating characteristics may change or the sealing performance may be destroyed due to external heating. For example, when the sealed relay is mounted on a printed circuit board and soldered, and then immersed in a high-temperature cleaning solution to clean it, the inert gas inside the housing 3 is heated and expands, causing the housing 3 to be removed from the inside. Due to the pressing, there are problems in that the case 2 and the like are distorted, changing the operating characteristics, and a gap is created between the sealant 4 and the case 2, which destroys the sealing performance.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide an electronic device whose operating characteristics do not change even when heated from the outside and whose sealing performance can be ensured.

(Means for Solving the Problems) In order to achieve the above object, an electronic device according to the present invention has the following features:
An electronic device in which internal components are assembled in a sealed housing by fitting a case to a base, in which at least one through hole provided in the housing is sealed with an elastic membrane for pressure adjustment. .

(Function) Therefore, according to the present invention, when the internal gas expands due to heating from the outside and the internal pressure increases, the pressure adjusting elastic membrane bulges outward from the housing and increases the internal volume. This will keep the internal pressure constant.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawing of FIG.

Like the conventional example, this embodiment is applied to a relay, and includes a base 10, an electromagnetic block 11 provided on the upper surface of the base 10, and a movable iron piece 12 that rotates based on the excitation and demagnetization of the electromagnetic block 11. As the movable iron piece I2 rotates, the movable contact piece 14 rotates via the card 13.
A fixed contact piece 17 is provided with a fixed contact 16 that comes into contact with and separates from the movable contact 15 of the movable contact piece 14, and has a box shape that can be fitted into the base 10, and is fitted into the base 10 to form a housing. Case 18 forming 19 and this case 18
and a sole agent 21 that is injected into a recess 20 formed by the base 10 and solidifies to form a sole.

The through hole 22 provided on the side surface of the case 18 is
It is sealed with a pressure adjusting elastic membrane 23 attached with adhesive. This elastic membrane 23 is made of, for example, nylon or polyethylene, and epoxy resin or the like can be used as the adhesive.

Therefore, even if the relay according to this embodiment is heated from the outside and the gas inside the housing 19 expands, the elastic membrane 23
bulges out from the through hole 22 and increases the internal volume, so
The air pressure inside the housing 19 is kept constant, and the housing 1
No distortion occurs and no residual stress occurs.

In addition, although the above-mentioned Example demonstrated the case where it applied to a relay, it is not necessarily limited to this, and may be applied to other electronic devices. Furthermore, it goes without saying that the pressure adjusting elastic membrane is not limited to being attached to the housing later with an adhesive, but may be integrally molded by insert molding at the same time as the case is being molded.

(Effects of the Invention) As is clear from the above description, according to the electronic device according to the present invention, even if the gas in the housing expands due to heating from the outside, the elastic membrane for pressure adjustment expands and the internal volume increases. In order to increase the internal pressure, the internal pressure is kept constant. For this reason,
Since no large internal pressure is applied to the housing such as the case, no distortion is generated in the case, and no residual stress is generated, the operating characteristics do not change and the sealing performance can be ensured.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing an embodiment of an electronic device according to the present invention, and FIG. 2 is a front sectional view showing an embodiment of an electronic device according to a conventional example. DESCRIPTION OF SYMBOLS 10... Base, 18... Case, 19... Housing, 22... Through hole, 23... Elastic membrane for pressure adjustment. Figure 1

Claims (1)

[Claims] (1) An electronic device in which internal components are assembled in a sealed housing by fitting a case to a base, characterized in that at least one through hole provided in the housing is sealed with an elastic membrane for pressure adjustment. and electronic equipment.