JP2000283879A - Inspection device for waterproofness of electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly detect small leakage by equipping a negative pressure means for reducing the pressure in a case, indicating the failure of airtightness from the junction part of the case by a liquid level by a differential pressure, and at the same time detecting the liquid level by a position detection sensor for judging a waterproof inspection result. SOLUTION: A negative pressure means is connected to an air passage where a vacuum pump 1 for reducing the pressure in an electronic part case, solenoid valves 2 and 4, and a pressure tank 3 are connected. A detection means is of a U shape composed of a liquid pipeline 7 with liquid and a tank 5, a solenoid valve 6 is mounted to an air passage under the communication of the liquid pipeline 7 and the air passage, and a detection means for detecting the fluctuation of the liquid level for operating the weight of the liquid to air in the air passage is installed near the liquid pipeline 7. A waterproof inspection result judgment means optically detects the level fluctuation of the liquid level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof inspection apparatus for electronic equipment, and more particularly, to a method for visually confirming an air leak and electrically displaying the air leak. The present invention relates to a waterproof inspection device for electronic equipment.

[0002]

2. Description of the Related Art Conventionally, a waterproof inspection apparatus for electronic equipment is shown in FIG.
As shown in FIG. 5, a compressor (not shown) for generating high-pressure air, a pressure chamber 12 for uniformly applying external pressure to electronic components for confirming waterproofness, and a tank 14 containing water for confirming leakage. And a hose 13 immersed in the water.

[0003] Specifically, in order to confirm the leakage of the electronic component 11, high-pressure air sent from a compressor is added into the pressure chamber 12, so that the electronic component 1 is leaked.
1 is externally pressurized. If the electronic component 11 has an airtight leak, pressurized air enters from the airtight leak portion, passes through a hose 13, and enters a tank 14 containing water.
Air leaking from the end of the hose in the water is generated as air bubbles, and the air bubbles that are detected by the sensor 15 are used to determine whether the electronic component 11 is good or defective. Had been.

[0004]

In such a conventional waterproof inspection apparatus for electronic equipment, the time required for the pressure in the pressure chamber to reach a predetermined inspection pressure is slow, and the pressure in the airtight portion of the electronic component is reduced. It took a long time until pressurized air entered, air leaked into the hose and air bubbles were generated, and it took about 90 seconds when all inspection times were combined, resulting in poor productivity. Further, since the pressure chamber is large, the workability of assembling the electronic component to the inspection device is poor. Furthermore, there was a problem that the equipment could not be downsized.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a waterproof inspection apparatus for electronic equipment for inspecting air leaks from an electronic component case, comprising negative pressure means for reducing the pressure inside the case. Detecting means for indicating the liquid level by differential pressure of airtight leakage from the joint of the case,
A waterproof inspection device for electronic equipment, wherein a waterproof inspection result determination unit that detects the liquid level with a position detection sensor and digitally displays the liquid level is provided, wherein the negative pressure unit reduces the pressure inside the electronic component case. An air passage connecting the vacuum pump, the solenoid valve, the pressure tank, and the solenoid valve, and the detecting means connected to the air passage has a U-shape consisting of a liquid pipe containing a liquid and a tank. Under communication between the pipe and the air passage, a solenoid valve is attached to the air passage, and detection means for detecting a change in the liquid level of the liquid that causes the liquid weight to act on the air in the air passage is provided in the liquid passage. It is provided in the vicinity position, and the waterproof test result determination means uses the liquid level level detection means as optical detection.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described together with the illustrated example. FIG. 1 is a schematic configuration diagram of a waterproof inspection device of the present invention, showing a state in which an electronic component case is not airtight and leaking, and shows that there is no difference in liquid level between a tank side and a detection means side. FIG. 4 is a view showing a leak-tight state of the waterproof inspection device of the present invention, wherein the liquid level is lower on the detection means side due to the leak of the electronic component case than on the tank side and the detection means side. It is shown that.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, the procedure of the inspection apparatus will be described. The vacuum pump 1 is operated in advance and the solenoid valve 2 is opened. The air pressure in the pressure tank 3 is maintained at a negative pressure. Set the electrical components 11 in the waterproof inspection device. The solenoid valves 4 and 6 are simultaneously opened. As a result, the air inside the electronic components, inside the detecting means and the air passage escapes, and the inside of the pipe becomes negative pressure. The solenoid valve 4 is closed, and the level A of the liquid level in the liquid line is confirmed. The solenoid valve 6 is closed, and the level B of the liquid level in the liquid line is confirmed. Check the difference between the liquid level A and the liquid level B. If there is no difference, it indicates a state in which the electronic component case is not airtight, and the electronic component is a non-defective product.

In FIG. 2, after the procedure (装置) of the same inspection apparatus as in FIG. 1 is completed, the difference between the liquid level A and the liquid level B is confirmed. This indicates the state of airtight leakage of the component case, and the electronic component is defective.

That is, when the solenoid valve 6 is closed, a pressure difference between the pressure in the liquid line 7 and the pressure in the tank 5 is generated, and the liquid level in the liquid line 7 is lowered. When the liquid level drops below the position, this electronic component 11
Waterproof inspection failed.

Here, the liquid conduit 7 has high transparency and transmits light, and is composed of a glass tube, a plastic tube, or another transparent tube. As shown in the partial cross-sectional view of FIG. 1, the liquid level detection means includes a sensor (a water level upper limit detection sensor 8, a water level lower limit detection sensor 9, Result judgment sensor 1
Detect in 1).

In practice, the level of the liquid cannot be detected if the amount of the liquid is significantly deviated from the position of the sensor. Therefore, before the test, the mounting range of the upper water level detection sensor 8 and the lower water level detection sensor 9 must be determined. A sensor for monitoring liquid coming inside is mounted, and an inspection result determination sensor 11 is mounted below the sensor so that the inspection is not rejected due to an insufficient amount of liquid.

[0012]

As described above, according to the present invention, in the waterproof inspection apparatus for electronic equipment, the time required to reach the inspection pressure can be reduced, and the cross-sectional area of the liquid surface of the liquid pipe and the liquid surface of the tank can be reduced. By increasing the ratio with respect to the cross-sectional area, a minute leak can be detected in a short time, and the inspection time, which conventionally took about 90 seconds, has now been increased to about 30 seconds. Furthermore, the elimination of the pressure chamber has made it possible to downsize the equipment.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a waterproof inspection device of the present invention.

FIG. 2 is a diagram showing a leak-tight state of the waterproof inspection device of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional waterproof inspection device.

[Explanation of symbols]

1 vacuum pump 2 solenoid valve 3 pressure tank 4 solenoid valve 5 tank 6 solenoid valve 7 liquid line 8 water level upper limit detection sensor 9 water level lower limit detection sensor 10 inspection result judgment sensor 11 electronic parts 12 pressure chamber 13 hose 14 tank 15 sensor

Claims (1)

[Claims] An electronic equipment waterproof inspection device for inspecting an air leak of a case of an electronic component, comprising negative pressure means for decompressing the inside of the case, wherein airtight leakage from a joint of the case is reduced by a differential pressure to a liquid level. In the waterproof inspection device for electronic equipment, wherein the negative pressure means is provided with a detection means for displaying in the, the liquid level is detected by a position detection sensor, and a waterproof inspection result determination means for digital display is provided. An air passage connecting the vacuum pump 1, the solenoid valve 2, the pressure tank 3, and the solenoid valve 4 for decompressing the inside of the electronic component case is connected to the air passage. The liquid conduit 7 and the air passage are in communication with each other, and a solenoid valve 6 is attached to the air passage so as to apply a liquid weight to the air in the air passage. Fluctuations in liquid level Detection means for detecting for a certain thing provided in the vicinity of the liquid conduit.