JPH0547415Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a dust environment testing device for electronic components.

(Prior art) A dust environment test device for testing contact failures caused by dust on contact parts of electronic parts, especially parts with contact parts such as switches, relays, and connectors, is used as a dustproof and abrasion resistance test of conventional parts. Because it was developed, its dust concentration was high and it was an accelerated environmental test.

(Problem that the invention aims to solve) For this reason, it was not useful for elucidating the effects of dust in the normal atmosphere, and there was a problem that the reliability of the test could not be ensured.

The purpose of the present invention is to solve this problem by providing an apparatus that can maintain a low dust concentration and maintain a constant dust concentration over a long period of time.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained using diagrams corresponding to embodiments.
A dehumidifier 3 connected to the air compressor 1, a dust generator 8 connected to the dehumidifier 3, an electronic component testing chamber 10 connected to the dust generator 8, and the electronic component testing chamber 1.
The dust generator 7 is provided with a dust tank 9 having an adjustable feeder 8, and is connected to the electronic component testing chamber 10 and the dehumidifier 3. A dust measuring section 22 consisting of a light emitter 20 and a light receiver 21 installed through a pair of air outlets 19, 19 is provided, and a dust concentration measuring device 2 is connected to the measuring section 22.
4 is connected to the feeder 8.

(Function) According to the above-mentioned means, the electronic components in the test chamber 10 are measured by the measuring device 27, and the dust concentration in the test chamber 10 is measured by the measuring section 22, and the dust concentration measuring device 24 connected thereto As a result, the dust concentration in the dust generator 7 connected to the test chamber 10 is adjusted, so that the dust concentration in the test chamber 10 is always adjusted to a desired concentration.

(Embodiment) An embodiment of the present invention will be described below based on the drawings. Reference numeral 1 indicates a compressor;
is connected to a dehumidifier 3 via an air filter 2,
The dehumidifier 3 is further connected to a dust generator 7 via a pressure regulating valve 4, a flow regulating valve 5 and a flow meter 6, and the generator 7 has an adjustable feeder 8, such as a screw feeder. A dust tank 9 is provided.

Reference numeral 10 indicates an electronic component testing chamber, and the testing chamber 10 is formed in a box body provided with an opening/closing door 12 having a viewing window 11, and the dust generator 7 is installed inside the box.
an inlet 13 connected to the inlet 13, an umbrella-shaped diffusion plate 14 located on the lower surface of the inlet 13, an electronic component support 15 located below the diffusion plate 14, and an air filter opened below the support 15. With outlet 16
and a regulating valve 4 and a second flow regulating valve 17 in the dehumidifier 3.
and a dust measuring unit 22 consisting of a pair of air outlets 19, 19 connected via a second flowmeter 18, and a light emitter 20 and a light receiver 21 located within the air outlets 19, 19. In the illustrated measurement unit 22, a light projector 20 and a light receiver 21 are arranged in parallel, and these are installed in one of the jet ports 19, and a prism 23 is installed in the other jet port 19 facing thereto.
However, the light projector 20 and the light receiver 21 may be provided separately in the ejection ports 19, 19, respectively, and directly face each other without interposing the prism 23.

The measuring unit 22 is connected to a dust concentration measuring device 24, and the measuring device 24 is connected to the feeder 8 so as to adjust the feeder 8 based on the measurement, and is also connected to the microcomputer via a digital voltmeter 25. 26.

Reference numeral 27 indicates a measuring instrument, the measuring instrument 27 is formed with a universal scanner, and the measuring instrument 27 is connected to an oscillator 29 provided for setting test conditions for the electronic component 28 on the electronic component support stand 15. It was connected to a power source 30, and the measuring instrument 27 was further connected to the microcomputer 26 via a digital voltmeter 31.

In the figure, 32 is the washing water intake, 33 is the drain, 3
4 indicates an exhaust container.

FIG. 2 is a flow chart of the program processing used to measure the test results of the present invention, in which an oscillator 29 and a power supply 30 are connected to an electronic component 28, such as a relay, on an electronic component support stand 15. The electronic component 28 is brought into an operating state in which it opens and closes in a constant cycle. Next, step 35 as shown in Figure 2.
Operate the microcomputer 29 with step
36 with digital voltmeter 25, 31 and measuring instrument 2
7 and 7 are initialized so that the control command can be executed. Next, in step 37, the time required for the first data acquisition is set, and in this state, the measuring instrument 27 is placed in a measurable state, the control command for data acquisition from the microcomputer 26 is executed, and the process proceeds to step 38. , 39 and 40, the measurement data of dust concentration and contact resistance value are input to the microcomputer 28.

The dust concentration is measured by the dust concentration measuring device 24, the measurement data is inputted via the digital voltmeter 25, and the contact resistance value is sequentially measured by the measuring device 27 for the number of channels set by the control command. , are input via the digital voltmeter 31.

This completes the input of the first measurement data to the microcomputer 26, and after waiting until the interrupt time set in step 37 is reached, the routine returns to step 38 and measurement data is input again. Measurement data continues to be input until the predetermined test time thus set is reached. The accumulated measurement data is stored on microcomputer 2.
In steps 42, 43, and 44 for a recording capacity of 6, data is stored in the external recording device every 6 hours.

(Effect of the invention) In this way, when the invention is applied, the compressor 1
A dehumidifier 3 connected to the dehumidifier 3, a dust generator 7 connected to the dehumidifier 3, and an electronic component testing chamber 10 connected to the generator 7.
and a measuring device 27 for measuring electronic components in the test chamber 10, and the dust generator 7 is provided with a dust tank 9 having an adjustable feeder 8, and the dehumidifier 3 is provided in the test chamber 10. Connected 1
Concentration measuring section 2 consisting of a light projector 20 and a light receiver 21 installed via a pair of air outlets 19, 19
2 is provided and a dust concentration measuring device 24 connected to the measuring section 22 is connected to the feeder 8. Therefore, in the test chamber 10, the dust concentration is measured by the simple measuring section 22, and the dust in the measuring section 22 is The dirt caused by this is cleaned by the dry air from the dehumidifier 3 through the spout ports 19, 19, thereby reducing the measurement error. is adjusted so that the dust in the generator 7 can be adjusted very easily and accurately, which has the effect of ensuring the reliability of the test.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a flow chart of measurement program processing. 1... Compressor, 3... Dehumidifier, 7... Dust generator, 8... Feeder, 9... Dust tank,
DESCRIPTION OF SYMBOLS 10... Test chamber, 19... Spout, 20... Emitter, 21... Light receiver, 22... Measurement part, 24...
Dust concentration measuring device, 27... Measuring device.

Claims (1)

[Scope of utility model registration request] It consists of a dehumidifier connected to the air compressor, a dust generator connected to the dehumidifier, an electronic component testing room connected to the dust generator, and a measuring instrument for measuring electronic components in the electronic component testing room, and the dust generator is connected to the air compressor. A dust tank having an adjustable feeder is provided in the device, and a concentration measuring section consisting of a light emitter and a light receiver is installed in the electronic component testing room via a pair of air outlets connected to the dehumidifier. 1. A dust environment testing device for electronic components, characterized in that a dust concentration measuring device is provided and connected to the measuring section and connected to the feeder.