JP2004047475A - Electrostatic charge eliminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic charge eliminator which is applicable to a person who becomes electrostatically charged specially (in much amount), and does not need electric power. <P>SOLUTION: In the electrostatic charge eliminator, a pair of conductive pieces to be contacted with an electrostatically charged body are fixed through an insulator, and electrically connected through a varistor, a discharge tube or an air gap alone or in combination thereof, whereby electrostatic charge is eliminated without grounding by discharging and absorbing it in the circuit. <P>COPYRIGHT: (C)2004,JPO

Description

(4) The present invention relates to a static eliminator for preventing static electricity charged on a human body from giving a shock to a person and preventing a malfunction or failure caused by static electricity entering an electronic device from the outside.

In the daily life, when the human body moves, such as walking, static electricity is generated due to the friction of clothes, etc.Carpets are laid on floors such as hotel lobby, etc. These static electricity is not discharged spontaneously and the charge is high.Therefore, when touching the elevator operation panel, the handle of the car door, metal furniture, etc., the static electricity charged on the clothes will be charged. It discharges rapidly and gives a strong impact.

In addition, electronic devices such as personal computers and mobile phones use a large number of integrated circuits and electronic components.Static electricity is also generated by friction between objects, but charged human bodies approach or touch electronic devices. If you do, you often move to them. When the electrostatic charge accumulated in the electronic device exceeds the withstand voltage and discharges at once, the discharge may exceed several KV. This discharge sometimes causes malfunction or failure of the electronic device.

Such a method of mitigating the shock generated at the time of discharging the static electricity is generally a method of reducing the shock received by grounding via a high resistance, that is, a so-called surge absorbing circuit including a resistor. The present invention is a device in which earth is interposed to alleviate a sudden discharge, or an improvement thereof. For electronic equipment, a circuit is formed by combining a coil that suppresses discharge current, a resistor, a capacitor that absorbs electrostatic pulses, a Zener diode, etc., and it is built into an electronic circuit, and an AC voltage that generates ion gas groups There are known methods for mounting an applied type static eliminator and the like, and the main documents relating thereto are as follows.
JP-A-10-316321 JP-A-2001-35684 JP-A-04-154455 JP-A-11-176590 JP-A-02-21596 JP 2001-338794 A JP-A 1-251598 JP-A-05-174376 Common sense of electricity Seminar P36-P37 Japan Business Publishing Company Akio Seki Electric discovery story P25-28, P55-59 Kodansha Co., Ltd. Tetsuo Fujimura

However, in the conventional method, a high resistance, a conductive material, etc. are interposed in a path for discharging the static electricity charged on the clothes to mitigate the sudden discharge, and the discharge circuit is assumed to be grounded to the ground. Is formed, and the human body also becomes a part of the circuit configuration. Also, this method must always contact an object that leads to ground.

As a method that does not require grounding, there is a method of ionizing by corona discharge and removing static electricity of a charged object, but requires an expensive device and supply of power for corona discharge.

The state of electrification to the human body is wide, and it varies widely.Some people are slightly electrified, some are electrified, others are electrified. May not be possible. Further, in the case of an electronic device or the like, there is an inconvenience in that grounding causes troubles due to noise from grounding.

Patent Document 1 is characterized in that the electrostatic absorption plate is grounded via a very high resistance. However, compared to the case where there is no resistance, the electrostatic voltage is not instantaneously applied but is applied for a long time by the resistance, so that the impact is received. Is said to be reduced, but it is incomplete as a removal device.

Patent Documents 2, 3, 4, 5, and 6 are also methods of grounding a metal part of a structure, a car door, or the like via a contact member. In the method that requires grounding, as shown above, some people are shocked, and there is also the inconvenience of having to search for a contact member to be grounded.

Patent Document 7 can remove static electricity without grounding by attaching a conductive material to a conductive fiber, but it removes it by discharging in the air, so if there is an atmosphere, flammable gas, organic solvent, etc. in the vicinity, an explosion occurs. There is a restriction on where to use because of danger of ignition.

Patent Literature 8 is an improvement of a typical static electricity removing method without grounding, and uses an ion generator that applies high voltage from a high-voltage power supply to an ion generating electrode to ionize air to neutralize the electric charge charged on the PET film. However, it requires an expensive discharge voltage generator and also requires electric power.

Patent Document 9 describes improvement of a product called a wrist trap as one of the measures against static electricity.
Like the conventional product, grounding is required and a cord for that purpose is attached, which is inconvenient in work.

As shown in the above-mentioned literature, various methods such as a method of removing electric charges charged on a human body, a method of removing charges on articles in a special article manufacturing process, a method of preventing charges on portable electronic components, and the like are used. It is an object to improve disadvantages.

The static electricity removing device of the present invention is characterized in that static electricity is stored in the device by electrostatic induction without grounding, and then discharged and absorbed by a varistor, a discharge element, and an air gap. That is, a pair of conductor pieces that are brought into contact with an electrostatically charged body are fixed via an insulator, and the charge stored by electrostatic induction is caused to act as a varistor, a discharge element, and an air gap as a switch for discharging. Static electricity removing device that can discharge and absorb electricity to remove static electricity when combined.

As shown in Non-patent Document 1 and Non-Patent Document 2, when an electrostatically charged body is brought into contact with a conductor piece, a charge opposite to that of the electrostatically charged body is electrostatically induced on the other conductor piece, and the conductor is charged. Electric charges are stored between the two pieces.
The varistors and discharge tubes connected between them have a high resistance almost equal to that of the insulator up to their respective firing voltages, but when the applied voltage exceeds the firing voltage, the resistance rapidly decreases. It becomes substantially conductive, where the stored charge is absorbed and consumed by the internal resistance of the varistor. Static electricity is very high in voltage but very small in current value, so that the resistance of the varistor is sufficiently consumed. In the case of a discharge tube, it is consumed as light during discharge.

It is the high voltage (it is said to be about 1 KV or more) that the human body suffers severe pain due to the discharge of static electricity, so if the voltage is absorbed and reduced to a low voltage, the severe pain disappears. In general, a varistor has a very high resistance below the varistor voltage, and hardly any current flows.However, when a voltage exceeding the varistor voltage is applied, the resistance rapidly decreases and a current flows. Discharge and absorption.

3. The static electricity removing device according to claim 2, wherein when the electrostatically charged body is brought into contact with the conductive piece, a charge of the opposite polarity to the electrostatically charged body is applied to the other conductive piece by electrostatic induction between the conductive pieces. Similarly, the voltage between the conductor pieces is also applied to the varistor, and when the voltage exceeds the varistor voltage, the resistance of the varistor rapidly decreases and current flows, and a voltage higher than the discharge starting voltage is applied to the discharge tube. Discharges and lights up.
That is, by connecting the discharge tube (neon tube) according to claim 2 in series with the varistor between the conductor pieces, the electric charge charged between the conductor pieces was discharged and absorbed. You can confirm that.

Here, the discharge start voltage of the varistor connected in series with the discharge tube is obtained by adding the discharge start voltage of the varistor to the discharge start voltage of the discharge tube so that the discharge tube is turned on. It is necessary to choose something lower than the starting voltage.

When the charged human body comes into contact with the conductor pieces, at that point, the charge moves between the conductor pieces and no charge remains on the human body. The charge stored between the conductor pieces is discharged and absorbed by the varistor. Then, even if the human body touches other metal parts, the operation panel of the elevator, the handle of the car door, etc., no severe pain will run. That is, the electric charge moves between the conductor pieces by the electrostatic induction and discharges between the conductor pieces, so that the human body is not directly impacted.

The impact on the human body can be removed by installing it at the elevator, the entrance of the room, the gate, etc.
A car key or the like only has a key, so that the human body can be charged without touching anywhere, and thereafter, no impact is received even if the car door is touched.

An accident has occurred at a self-service gas station, etc., which has recently become popular.However, even if a removal device is installed, the method of removal by aerial discharge is dangerous, and grounding through high resistance. In such a case, a discharge occurs during the moment when the charged body comes into contact with the high resistance, and there is a possibility of ignition or explosion depending on the surrounding atmosphere, which is dangerous. In the present invention, there is an excellent point that the discharge and absorption of the electric charge are processed inside the element of the varistor and are not affected by the external atmosphere.

In special processes such as film transport and small electronic component manufacturing, it is difficult to ground because removal of electric charge on the product is accompanied by movement, and in general, an ion generator is used or static I use a spray for removing electricity. Since the present invention does not require grounding, it can be easily mounted even in the moving step.

The varistor is a ceramic material, and is a surge absorption element that protects various electronic devices and semiconductors.It has excellent response without stalls even for steep surges, and is used in a wide range. I have.
Up to the varistor voltage, it has a high resistance close to that of an insulator, but at the varistor voltage, the resistance value is rapidly reduced and becomes conductive. 2. The static eliminator according to claim 1, wherein the electric charge stored in the battery is discharged and absorbed.

Discharge tubes have a lower response than varistors, but have the advantage that discharge can be confirmed by lighting during discharge.

In air, when a voltage is applied between gaps of 0.2 mm, discharge occurs at about 1.5 KV. However, although there is a change depending on the humidity and other conditions, the electric charge can be removed by maintaining a gap of 0.1 mm to 0.2 mm between the conductor pieces.
However, since it is an air discharge, it cannot be used in an atmosphere where there is a risk of ignition or explosion such as an organic solvent or gas. However, there is an advantage that static electricity can be removed by a simple method depending on the location.

As described above, the static eliminator according to the present invention has the following effects.

1. The human body can remove static electricity without impact or discomfort by touching the static electricity removing device without touching other parts.
2. As in the above-mentioned item 1, it is possible to remove the impact and discomfort by mounting it on an elevator operation panel, a hotel room door, a car door handle, a building door knob, or the like.
3. Since the static electricity is discharged and absorbed inside the device, no grounding is required. By mounting the device on an electronic device, a game machine, or the like, the static electricity can be removed while preventing noise from grounding.
4. Unlike the conventional static eliminator using ions, an ion generating device and an electric power for generating ions are not required.
5. By attaching the mobile phone to a mobile phone, it is possible to remove static electricity from the human body at all times when the mobile phone is carried and is in contact with a conductive piece, preventing failure of the phone due to static electricity.
6. The method of removing static electricity is discharge absorption, but all are phenomena inside the element of the varistor and are safe without being affected by the external atmosphere.

As described above, the conventional method compensates for the drawbacks of the static eliminator which could not be applied to various fields, and the effect is great.

FIG. 1 is a basic conceptual diagram of the present invention.
The inside and outside of the glass bottle are covered with tin foil, and the mouth of the bottle is covered with a cork stopper, and a metal rod 35 with a chain is attached to it, and the tin foil 31 inside the bottom is contacted. It is. When the positively charged charger 30 is brought into contact with the metal bar 35, a positive charge moves to the inner tin foil 31, while a negative charge appears on the outer tin foil of the bottle due to electrostatic induction, Static electricity accumulates between the tin foils 31, 32.

Fig. 1 is a specific conceptual diagram of the present invention. When the charged material # 99 comes into contact with the conductor piece 1, the conductor piece 2 on the opposite side of the insulator 6 across the insulator 6 is charged with the charge of the opposite pole to that charged on the conductor piece 1. Static electricity is stored between the body pieces. Thereafter, when the varistor 3 reaches the discharge starting voltage, the stored electric charge is discharged, absorbed, and removed.

FIG. 3 shows a circuit configuration diagram of an embodiment of the present invention.
Aluminum pipe 1 as a conductor piece, aluminum pipe 2, varistor (varistor voltage, 280V) 3, varistor (varistor voltage, 24V) 4, discharge tube (neon tube) , Discharge starting voltage, 80 V) 5, 61 are the distributed capacitance of the insulator, and 71 is the specific resistance of the conductor piece.

FIG. 4 is an external view of a portable cylindrical type static eliminator. FIG. 5 shows a sectional view AAA. Aluminum pipe 1, aluminum pipe 2, varistor (varistor voltage, 280V) $ 3, varistor (varistor voltage, 24V) 4, discharge tube (neon tube, discharge starting voltage, 80V) $ 5, insulator (adhesive, Product name: Z-melt) $ 6.

The aluminum pipe 1 introduces charged static electricity as an external conductor piece. The aluminum pipe 2 is installed with an insulating material inside. In this case, the adhesive itself is used as the insulating material. , The pipes are fixed. A varistor 3 is connected between the aluminum pipe 1 and the aluminum pipe 2, and a varistor 4 and a discharge tube 5 connected in series are electrically connected in parallel.
A light hole 51 is formed in a part of the side surface of the aluminum pipe 1 so that the discharge state of the discharge tube can be seen.

As a result of the above-mentioned human body test of the apparatus (particularly by six people who are sensitive to static electricity), the discharge tube was turned on when a person charged with static electricity gripped the aluminum pipe of the static eliminator. Thereafter, there was no impact even when touching another metal device, and the static electricity charged on the human body was removed.

However, when the aluminum pipe 2 of the device was grounded, the discharge tube was turned on, but it was found that it was better not to ground because the impact was applied to the human body. From the above results, it was confirmed that there was no impact on the human body at the time of discharge and the static electricity could be sufficiently removed as a portable device.

{FIG. 6 is an external view of a static electricity removing device of a mounting type, and FIG. 7 is a sectional view taken along line BB. It is composed of a conductor piece # 11, a conductor piece # 12, a varistor # 13, a varistor # 14, a discharge tube # 15, an insulator # 16, and an outer case # 17. When the person charged with the static electricity touched the conductor piece # 11, the discharge tube # 15 was turned on. The state was confirmed by the light hole # 20.

Thereafter, the charged person touched the metal part of the building (grounded) without severe pain. However, when the conductor piece # 12 is grounded, a person who is sensitive to static electricity suffers severe pain in his body. Also in this case, some people are slightly shocked, while others suffer severe pain. Therefore, it is better not to touch the ground.

In particular, it has been found that in the case of a person who is sensitive to static electricity, severe pain runs when the person is grounded. Therefore, in this case, it is necessary to attach a conductive piece that is not a conductive piece touched by a charged person to a building or the like via an insulating material.

The results of the human body tests showed that no impact was observed when no contact was made with the ground, and that two of the 52 people were impacted when the contact was made. Further, as a countermeasure for a person who is sensitive to static electricity, a method of alleviating an impact through a high resistance of several MΩ to several hundred MΩ between a human body (finger) and a conductive piece in contact is also effective.

FIG. 8 shows a part of the manufacturing process of the special resin. By installing the static electricity removing device of the present invention, it was possible to remove the charged 45 KV static electricity.
After drying the melted special resin 22 and dragging it out of the shelf of the drying furnace, the tray 23 and the special resin 22 are taken out. When the tray 23 is charged with static electricity of 30 KV to 45 KV, When the static electricity removing device of the present invention was connected to the tray 23 by the cord 24, the static electricity charged on the tray 23 was removed. The result was also confirmed by lighting of the varistor 3 and the discharge tube 5 connected in series.

As described in the above embodiments, the static electricity removing device of the present invention can be of a portable type or a mounting type, depending on where it is used, and both types can exert sufficient effects.

The static eliminator according to the present invention is not limited to the method of use described above, and may be used to protect electronic components from the effects of static electricity, such as notebook computers, mobile phones, and portable tape recorders for portable use. , And the like, and can be mounted on an electronic device that picks up noise, such as a game machine, on the contrary to the ground.

In particular, the recent spread of mobile phones has been remarkable, but due to the nature of mobile phones, it is difficult to ground, and failures of unknown causes that are thought to be due to static electricity charged to the human body have occurred.
In addition, a mobile phone is frequently used as an object with which the human body comes in contact. Since the static electricity is removed every time the mobile phone is contacted by installing the static electricity removing device of the present invention, the portable telephone is compared with a conventional static electricity removing tool. Nevertheless, the shortcomings can be sufficiently compensated for, and there is great potential for industrial use. Currently, preparations for sales of some mass-produced products are being made.

It is a basic conceptual diagram of the present invention. It is a circuit block diagram of this invention. FIG. 2 is a circuit configuration diagram of an example of the present invention. It is an outline view (portable type) of an example of the present invention. It is sectional drawing of the portable static eliminator of this invention. It is an external view (attachment type) of the Example of this invention. FIG. 2 is a cross-sectional view of the static electricity removal device of the present invention. It is a use form figure in the manufacturing process of the static electricity removal device of the present invention.

Explanation of reference numerals

1 Conductor piece-1
2 Conductor piece-2
3 Varistor (varistor voltage, 100V or more)
4 Varistor (varistor voltage, 100V or less)
5 Discharge tube (neon tube)
6 Insulator 11 Conductor piece-plate-1
12 Conductor piece-plate-2
17 Exterior case 20 Light hole 51 Light hole-2
22 Special resin 23 Tray 24 Code 30 Charger 31 Tin foil (inside)
32 Tin foil (external)

33 Glass bottle 34 Cork 35 Metal rod 99 Charged body-2

Claims (5)

A pair of conductor pieces to be brought into contact with an electrostatic charging member are fixed via an insulator, and a semiconductor ceramic material having a voltage-dependent non-linear resistance characteristic between the pair of conductor pieces (hereinafter, referred to as a varistor) , A discharge tube, and an air gap, at least one or more of which is conductively connected singly or in combination, and discharges and absorbs electric charge accumulated by electrostatic induction between conductive pieces, wherein the static eliminator is characterized in that: . A pair of conductor pieces that are brought into contact with the electrostatically charged body are fixed via an insulator, and a varistor and a discharge tube are connected in series between the pair of conductor pieces, The static eliminator according to claim 1, wherein the star and the star are electrically connected in parallel. The varistor connected in series with the discharge tube described above has a varistor voltage of 100 V or less, and the other varistors have a varistor voltage of 100 V or more. apparatus. 2. A plurality of varistors having different varistor voltages are connected in parallel between said pair of conductor pieces by fixing one of said conductor pieces to be in contact with said electrostatically charged body via an insulator. The static eliminator described. A pair of conductive pieces for contacting the electrostatically charged piece described above are fixed via an insulator, and at least one or more varistors and discharge tubes are conductively connected between the conductive pieces and mounted on a mobile phone. The static eliminator according to claim 1, wherein:

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