JPH058529Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a pseudo-static electricity generator for testing damage to various devices due to electrostatic discharge.

[Conventional technology]

Conventionally, this type of tester uses a vane method, which generates high voltage internally and charges a metal plate called a vane, and then discharges it with a high-voltage relay, or a capacitor built into the probe or main body to charge it. There are two main types of methods: a method in which a probe or discharge needle is brought close to the test object and a natural discharge is generated.

Recently, as electronic devices under test have become denser and their circuits and configurations have become more complex, vane-type pseudo-static generators that can generate electrostatic discharge closer to that of a human body are increasingly being used. It's here.

The vane type pseudo static electricity generator will be explained with reference to FIG. A control circuit 11, a high voltage generator 12, and a charging resistor 13 are built into the housing 1. A blade 15 having a cross-shaped cross section is removably attached to the housing 1 via an insulating plate 14.

The control circuit 11 controls the high voltage generator 12 to set the voltage at which the blade 15 is charged. The output of the high voltage generator 12 is applied to the blade 15 through the charging resistor 13. The high voltage relay 16 is connected to the control circuit 11
The blade 15 discharges electricity from the blade 15 to the object to be measured. The discharge needle 17 is connected to the high voltage relay 16,
Generally, it is used in direct contact with the object to be measured.

FIG. 3 is an enlarged view of the blade 15.

[Problem that the invention attempts to solve]

However, when this pseudo-static generator is placed near an object to be measured and the blades 15 are charged to a high voltage, corona is generated at the corners of the blades 15 or at the ends of the blades facing the object to be measured. This is because the blades are made of metal plates and have a three-dimensional structure.
This is due to the fact that at the end of the blade, the potential gradient of the blade surface with respect to the object to be measured and the air becomes extremely high. Therefore, it is less likely to occur on the flat portion of the blade 15.

This corona discharge not only causes damage to the highly sensitive object to be measured, but also brings about the disadvantage that charging to a predetermined high voltage is no longer possible.

Therefore, the object of the present invention is to provide a pseudo-static electricity generator that can prevent corona discharge at the ends of the blades.

[Means for solving the problem]

The present invention is characterized in that a metal pipe having a slit in the axial direction corresponding to the thickness of the blade is attached to the discharge end of the blade of the pseudo-static electricity generator through the slit.

[Effect]

According to such a structure, the ends of the blades are formed into curved surfaces by the metal pipes, and the surrounding potential gradient is made gentler, thereby suppressing the occurrence of corona discharge.

〔Example〕

An embodiment of the present invention will be described with reference to FIG. The figure shows only the blade 15, and the parts not shown are the same as in FIG. 2.

This embodiment is characterized in that a metal pipe 20 is attached over the entire length of the discharge end of the blade 15. That is, a slit 21 is provided along the entire length of the metal pipe 20 in accordance with the thickness of the blade 15,
A metal pipe 20 is attached to the discharge end of the blade 15 through this slit 21. metal pipe 20
As a result, the discharge ends of the blades 15 appear to have a curved surface, which softens the extreme potential gradient in the surroundings that causes the generation of corona, thereby suppressing the generation of corona.

[Effect of idea]

This makes it possible to charge at a high voltage that could not be charged with conventional devices, making it possible to widen the test range. It can also be used as a tester for highly sensitive objects. Furthermore, this structure can be realized at a very low cost by using metal pipes, and it does not have any effect on the discharge characteristics of the conventional vane system.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main part of an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a conventional device, and FIG. 3 is an enlarged view of the blade portion of FIG. 2. In the figure, 1 is a housing, 11 is a control circuit, 12 is a high voltage generator, 13 is a charging resistor, 14 is an insulating plate, and 15 is a blade.

Claims (1)

[Scope of utility model registration request] In a vane-type pseudo-static electricity generator comprising a plurality of vanes that intersect at their centers, and at least one vane has a discharging needle at the discharging end for direct contact with the device under test, the discharging end of the vane is A pseudo-static electricity generator, characterized in that a metal pipe having a slit in the axial direction corresponding to the thickness of the blade is attached through the slit, and the discharge needle is attached to the metal pipe.