JPS6035280A - Electrostatic discharge tester - Google Patents

Abstract

PURPOSE:To guarantee the quality accurately with a higher testing reliability by performing an electrostatic discharge testing making a discharge electrode automatically approach or retreat an object to be tested to uniformize the discharging time interval. CONSTITUTION:A reciprocative driving unit 11 is provided with a discharge electrode 10 at the tip of a spindle 11a and reciprocates the spindle 11a with a reciprocating mechanism to advance or retract the discharge electrode 10. Then, the discharge electrode 10 is mounted on a stand 9 in such a manner that the electrode 10 advances to cause a discharge as approaching an object 1 to be tested. Then, a capacitor 6a is charged to a voltage specified by a voltage dial 7a. Upon the completion of the charging, a changeover switch 6c is turned to a high voltage generation circuit 6 and the reciprocative driving unit 11 is driven with a reciprocative driving control circuit 13 so that the tip of the discharge electrode 10 approaches a specified point of the object 1 being tested and causes a discharge as reaching a specified distance. Then, the discharge electrode 10 is retracted.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to an electrostatic discharge tester that applies an electrostatic shock to equipment such as electronic equipment to test whether there is any abnormality in its operation, and in particular, it relates to an electrostatic discharge tester that tests the presence or absence of abnormality in operation of devices such as electronic equipment. This relates to an electrostatic discharge tester that can be moved back and forth and discharged when approaching the device.

fb) Technology Background In recent years, with the development of electronic technology, various electronic devices incorporating RC etc. have been developed and put into practical use.In particular, with the progress of office automation, various office computers, word processors, etc. have become widely used as office machines. It's starting to be used.

In these devices, the shock caused by electrostatic discharge may cause abnormalities in the characteristics of the ICs used, and this may cause output abnormalities in the devices. Therefore, during development, repeated tests are conducted to ensure that the design meets the specifications required to withstand static electricity shock at a predetermined level (for example, 1,000 to 10,000 volts), and during manufacturing, tests are conducted to check whether the product has been manufactured according to specifications. .

This test uses an electrostatic discharge tester that can perform repeated discharges, but reliability and safety of the test are required.

(C1 Prior Art and Problems The conventional method will be explained below with reference to the block diagram of FIG. 1.

In FIG. 1, 1 is a test object, 2 is an electrostatic discharge device,
3 is a cable, 4 is a discharge electrode, 5 is a high voltage power supply, 6 is a high voltage generation circuit, 6a is a capacitor, 6b is a resistor, 6c is a changeover switch, 7 is a control panel, 7a is a voltage dial, 7b
is the polarity switch, 7C is the lamp, 7d is the counter, 7e
indicates the power button, 7f indicates the start button, and 8 indicates the operator.

The test object 1 has a painted metal casing housing a mechanical section, a control section, etc. (not shown).

A discharge electrode 4 is connected to the electrostatic discharge device 2 by a cable 3.
is connected.

The discharge electrode 4 is an electrode that is brought close to the test object 1 in order to perform a discharge test, and is attached to the tip of a handle 4a held by an operator 8.

The selector switch 6C is connected to the capacitor 6a by the high voltage power supply 5.
When a high voltage is charged, the connection with the high voltage power source 5 can be dynamically switched to the high voltage power source 5 side by a switching mechanism (not shown).

The control panel 7 includes a voltage dial 7a for specifying the discharge voltage level and a polarity switch 7 for specifying voltage make and polarity.
b, an indicator lamp 7c that displays charging completion, a counter 7d that counts the number of discharges, a power button 7e that turns on the supply power (not shown) to the high-voltage power supply 5, and a capacitor 6a.
A start button 7f for instructing to start and stop charging is arranged.

With such a configuration and function, when performing an electrostatic discharge test on the test object 1, specify the voltage dial 7a and polarity switch 7b on the control panel 7, press the power button 7e, and then press the start button 7. If f is not pressed, the selector switch 6C is connected to the high voltage power supply 5. and capacitor 6a
is charged with the voltage specified by the voltage dial 7a.

When charging is completed, the selector switch 6C is switched to the high voltage circuit generating circuit 6, and the display lamp 7G lights up.

Then, the operator 8 grasps the handle 4a of the discharge electrode 4 and brings the tip of the discharge electrode 4 close to a predetermined location of the test object 1 (for example, the front panel or the vicinity of the keyboard), and when it reaches a certain distance, a discharge occurs.

Then, the counter 7d counts, the display lamp 7C goes out, the selector switch 6C is switched to the high voltage power supply 5 side, and the operator can start charging the capacitor 6a, so repeat the count until the counter 7d reaches a predetermined number of times. Perform a discharge test.

During this time, the test object 1 is monitored by another test device or measuring instrument (not shown) to see if there is any abnormality in the output due to discharge shock.

In this way, the electrostatic discharge test of the test object 1 can be performed.

However, according to this method, the operator brings the discharge electrodes 4 close together to discharge, which not only requires manual labor, but also makes the discharge time intervals uneven, making it difficult to reproduce defects (for example, output abnormalities due to changes in the characteristics of ICs, etc.). There are disadvantages in that the test is uncertain and the reliability of the test is low, and there is also a disadvantage in that it is dangerous due to the high voltage discharge.

(d1 Purpose of the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, and is to provide an electrostatic discharge tester that can automatically conduct a discharge test by reciprocating the discharge electrode.

(e1 Structure of the Invention The present invention is an electrostatic discharge tester equipped with a reciprocating means for reciprocating a discharging electrode and a repetitive charging means for automatically charging immediately after discharging. can be achieved.

<nEmbodiment of the Invention An embodiment of the present invention will be described below with reference to the block diagram of FIG. The same parts as in FIG. 1 are indicated by the same symbols.

In FIG. 2, 9 is a stand, 10 is a discharge electrode, 11
12 is a reciprocating drive unit, 12 is an electrostatic discharge device, 13 is a reciprocating drive control circuit, 14 is a reciprocating number counter, 15 is a timer, 16 is a control panel, 16a is a test mode dial,
16b indicates the number/timer designation counter.

The forward fff drive unit 1-11 includes a discharge electrode 10 at the tip of a spindle Ila, and has a function of reciprocating the spindle Ila by a reciprocating mechanism (not shown) to move the discharge electrode 10 forward and backward. The discharge electrode 10 is attached to the stand 9 and positioned so that when the discharge electrode 10 moves forward and approaches the test object 1, a discharge occurs.

A reciprocating drive unit 11 is connected to the electrostatic discharge device 12 via cables 3a and 3b.

Cable 3a is connected to high voltage generation circuit 6, and cable 3b is connected to reciprocating drive control circuit 13.

The reciprocating drive control circuit 13 drives and controls the reciprocating drive unit 11, and has the function of continuously driving the reciprocating drive unit 11 for a specified number of discharges or test time.

The reciprocating number counter 14 counts the number of reciprocating movements of the spindle lla of the reciprocating drive unit 11, that is, the number of discharges of the discharge electrode 10.

The timer 15 is used to count the test time when the time is specified for the discharge test without depending on the number of times specified.

The control panel 16 has the voltage dial 7a, polarity switch ab1 indicator lamp 7c, power button 7e, and start button 7f of the control panel 7 explained in the conventional example of FIG. 1, as well as the discharge test modes (continuous, single shot, etc.).

It is provided with a mode dial 16a for specifying the number of discharges (timer, timer) and a specification counter 16b for specifying the number of discharges or test time.

The designation counter 16b specifies the number of times when the mode of the discharge test is the number mode, and specifies the time when the timer mote Jft is fixed.

With such a configuration and function, when performing an electrostatic discharge test on the test object 1, for example, when testing in the number mode, first specify the voltage dial 7a and TM switch 7b on the control panel 7. Then, when the mode dial 16a is designated to the number of times mode, the number of times is entered in the specified counter 16b, and the power button 7e is pressed and the start button 7f is pressed, the switching switch 6C is connected to the high voltage power supply 5. . The capacitor 6a is then charged to the voltage specified by the voltage dial 7a.

When charging is completed, the selector switch 6C is switched to the high voltage circuit generating circuit 6, and the lamp 7C is turned on.

Then, the reciprocating drive unit 11 is driven by the reciprocating drive control circuit 13 to bring the tip of the discharge electrode 10 close to a predetermined location on the test object 1, and when it reaches a predetermined distance, discharge occurs. Then, the discharge electrode 10 retreats.

Then, the round trip counter 14 counts, the display lamp 7C goes out, a signal is sent to the high voltage circuit generating circuit 6, the selector switch 6C is switched to the high voltage power supply 5 side, the capacitor 6a is charged, and the specified counter 16b is charged. The discharge is repeated until the specified number of times is reached. Each time the discharge occurs, it is counted in the reciprocating number counter 14.

When the discharge of the number of times of the streetcar is completed, the drive of the reciprocating drive unit 11 is stopped, the changeover switch 6C is stopped with the high voltage generation circuit 6 in the discharge end state, and the count of the number of reciprocations counter 4 is cleared.

During this time, the test object 1 is monitored by another test device or a δ(meter) (not shown) to see if there is any abnormality in the output due to the discharge shock.

The above explanation is for the number mode, but for example, in the time mode, by specifying the mode dial 16a and specifying the test time on the specified counter 16b, the timer 15 will count and stop when the specified time comes. do.

In this way, the electrostatic discharge test of the test object 1 can be performed automatically and without relying on human hands, making it safe.Moreover, since the discharge time interval is uniform, the reliability of the test can be improved. can be increased. Therefore, the accuracy of the reproducibility of the change in characteristics of the test object 1 due to electrostatic discharge impact is increased, and the effectiveness of the test can be increased.

(3) As described in detail, according to the present invention, it is possible to conduct an electrostatic discharge test by automatically moving the discharge electrode toward and away from the test object, so that ■ the discharge time interval is uniform; This increases the reliability of the test and ensures quality assurance.

■Can improve safety.

There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional method, and FIG. 2 is a front view showing an embodiment according to the present invention. In the figure, 1 is a test object, 2.12 is an electrostatic discharge device, 4.10 is a discharge electrode, 5 is a high voltage power supply, 6 is a high voltage generation circuit, 6c is a switching switch, 7.16 is a control panel, 11
11a is a reciprocating drive unit, 11a is a spindle, 13 is a reciprocating drive control circuit, 14 is a reciprocating number counter, and 15 is a timer. Figure 1

Claims (1)

[Claims] An electrostatic discharge tester for testing the operation of a test object by applying an electric discharge shock to the test object, comprising a reciprocating means for reciprocating the discharging electrode, and a reciprocating means for reciprocating the discharging electrode, and a reciprocating means for reciprocating the discharging electrode; 1. An electrostatic discharge tester comprising: repeated charging means;