JPH0398297A - Static electricity removing device - Google Patents

Abstract

PURPOSE:To eliminate a static electricity including positive charge and negative charge by providing a rectifying element directing the voltage application to a capacitor in a fixed direction in a device in which the static electricity generated between contact terminals in contact with a target material charged with static electricity is accumulated by the capacitor and released as an electric energy. CONSTITUTION:A capacitor C for accumulating and holding a voltage by the static electricity generated between contact terminals A, B in contact with a charged target material and an energy releasing means D for releasing the electric energy accumulated in the capacitor C are connected in parallel to each other through wirings 3, 4 between the contact terminals. A bridge circuit E having a rectifying element combined therewith is connected to a circuit leading a Zener diode 4a and the capacitor O. Even if the polarity of the static electricity is changed, the energy releasing action is never stopped by the inversion of the polarity, and the circuit of the capacitor C and energy releasing means D regularly repeats releasing, and the static electricity can most efficiently be eliminated.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is applicable to processing and filling of food and cosmetic containers, winding and cutting of paper, films, and sheets, manufacturing and assembly of semiconductors, and copying. This invention relates to a new static electricity removal device for removing static electricity generated on machines, records, discs, etc.

(Prior art) Conventionally, as a means for removing static electricity, a) both positive and negative ions are generated by corona discharge, the ion wind is blown onto an object charged with static electricity, and the ions of the opposite polarity are combined to eliminate static electricity. b) Connect the primary electrode plate of an electrostatic AC converter based on a piezoelectric ferroconductor to a high-frequency oscillator that is an AC power source, and discharge the two opposing secondary electrode plates by themselves. Effective means include a method in which discharge is caused between both electrodes, and C) a method in which a conductive mat or a ground wire is used.

However, method (a) has the disadvantage that ozone and nitrogen oxides are likely to be generated in addition to ionized air because a relatively high voltage is applied, and the device becomes large. Each of these has disadvantages in that the high-frequency corona discharge is extremely weak, the density of positive and negative ions is low, so the static elimination effect is poor, and the piezoelectric ferroelectric material is expensive. and (a)
A serious drawback common to (b) is that the quantitative combination of positive and negative ions in the blown ion wind does not necessarily match the positive and negative static electricity charged on the object, resulting in excess or deficiency in one or the other. The remaining problem is that unneutralized static electricity remains in some parts, and the remaining ions cause new static electricity on the object due to their electromagnetic polarity. Further, although the conductive mat and the ground wire are simple, they are insufficient in eliminating static electricity.

(Problem to be Solved by the Invention) Therefore, the inventor of the present invention repeatedly conducted experiments and found that static electricity often consists of a local mixture of positive and negative charges on an object. It is important to eliminate just the right amount of mixed static electricity, and the present invention aims to develop a device that satisfies this requirement.

(Means for Solving the Problems) The static electricity removing device of the present invention has contact terminals A and B that come into contact with an object charged with static electricity, and a capacitor that stores and retains the voltage due to the static electricity generated between the contact terminals. 4J-C and
An energy key release means D that releases the electric energy implanted in the capacitor C is connected in parallel, and a bridge circuit E is connected between the terminals, which is a combination of a rectifying element that applies voltage to the capacitor 〇 in a fixed direction. It is composed of the following characteristics.

(Function) The static electricity generated on the object flows through the contact terminals A and B to the capacitor C, where it is accumulated and held, and when it reaches a certain voltage or higher, it is discharged and activates the energy release means D connected in parallel. , static electricity disappears due to consumption of electrical energy.

Then, when the polarity of the electricity loaded on the contact terminals A and B is reversed, the bridge circuit E, which is a combination of rectifying elements, is activated, and the electricity of the opposite polarity also enters the circuit of capacitor 〇 from the crossed path in the same direction as before. The capacitor 〇 works to apply voltage from a certain direction, and the capacitor C and the energy release means D work at maximum efficiency.

(Example) An explanation will be given based on FIG. 1 showing an example of the present invention.
A and B are contact terminals that come into contact with a charged object, and the object refers to any object that requires static electricity removal, such as plastic products, printed matter, copying machines, electronic parts sewing lines, etc. .

Between the wirings 1 and 2 of this terminal, a capacitor C that stores and holds the voltage due to the generated static electricity, and an energy release means D that releases the electrical energy stored in the capacitor C are connected in parallel by wires 3 and 4. . The capacitor C
3a, 3b, 3c, 3d may be enough if the capacitance is relatively large, but in order to increase the withstand voltage of the capacitor, 3a, 3b, 3c, 3d
4 were connected in series. The energy release means D may be any means as long as it releases the electrical energy stored in the capacitor C, but may include conversion into other electrical energy by a Zener diode 4a, conversion into light energy by a neon tube, etc. , conversion into thermal energy through resistance, etc. Among these, the Zener die auto 4a is superior in that it can keep the voltage constant and vary the current, so even if the amount of charge changes, the amount of current can be adjusted in accordance with the change. or,
Neon tubes allow visual confirmation of energy release.

And this Zener diode 4a and capacitor C
Bridge circuit E that combines a rectifying element with the circuit leading to
The details are as follows: connect the branched wires 5 and 6 between wires 1 and 2, connect the forward direction diodes la and lb to the wire 1, and connect the reverse direction to the branch wire 5. The diodes 5a and 5b in the direction are connected so that the static electricity input from the A terminal is positively applied from the wiring 1x side via the wiring 1. Then, diodes 2a and 2b in the opposite direction are connected to the wiring 2.
6a and 6b in the forward direction are connected to the branch wiring 6, and the static electricity input from the B terminal is transferred to the diode 2 in the reverse direction.
It is configured so that it flows into the wiring 6 side branched by a and 2b and is input from the connection 1x on the A terminal side, and when it is input in the opposite direction from the terminal B side, it is applied positively from the connection IX side in the same way as above. do.

Resistors 1r, 2r and 4r are connected in series to the wirings 1, 2 and 4, respectively, for regulating the input of breakdown voltage and protecting the rectifying elements and the like.

Now, in the above configuration, if the object is charged with static electricity, the static electricity will be input into this circuit through the contact terminals A and B, and if the voltage is relatively high, it will be directly connected to the Zener diode F'4. When applied to a, the Zener voltage causes a sagging effect and conducts electricity, that is, the electrostatic energy is converted into other electrical energy and disappears. Further, in the case of a neon tube, the electrostatic energy is converted into ultraviolet rays and visible light by discharge, and in the case of a resistor, it is converted into heat, and the electrostatic energy is extinguished.

When the charged voltage of static electricity is lower than the zener voltage of the zener die auto 4a, first, the static electricity is gradually accumulated and held in the capacitor C, and when it exceeds a certain voltage, it is discharged, and the zener die is discharged as described above. diode 4a
When energized, it is converted into other electrical energy and disappears.

At this time, Zena Daioh F' 4. The amount of energization due to the Nadare effect at the Zener voltage of a changes depending on the amount of static electricity generated, so the amount of energization is automatically changed to a large amount when the amount of static electricity is large and a small amount when the amount of electrification is small. adjusted to
Static electricity can be completely eliminated even when the amount of charge on an object is not constant.

By the way, it is generally understood that the static electricity problem is solved by the above action, but according to experiments conducted by the present inventor, the positive and negative polarity of static electricity is not necessarily constant on each surface of the object in which it is generated, and that the positive and negative polarities are different on the surface. Since the polarities of are mixed locally, if you try to remove only one polarity, if the polarity becomes reversed, the energy release action will stop during that time.
It turned out to be incomplete.

Therefore, when connecting a bridge circuit E that combines rectifying elements, for example, if a positive charge is applied from the A terminal side, it will be applied as it is from the connection 1a side, but if it is reversed to the B terminal side, the opposite will originally be applied. The current applied to the B terminal by the bridge circuit E is regulated by the diodes 1, 2a and 2b in the opposite direction, flows to the branched wiring 6, and passes through the diodes 6a and 6b in the forward direction to the opposite side. , and is applied to capacitor C etc. from the 1x side of the same connection as before. Therefore, even if the polarity changes, there is no risk that the energy release action will stop due to the reversal of the polarity, and the circuit of the capacitor C and the energy release means D constantly repeats the release, making it possible to eliminate static electricity most efficiently. can.

(Effects of the Invention) As described above, according to the present invention, when a contact terminal is brought into contact with an object charged with static electricity, the electrostatic energy is dissipated and disappears due to the combination of the capacitor and the energy emitting means. Furthermore, even when static electricity of opposite polarity (positive and negative) coexists, by connecting the bridge circuit, the voltage can always be applied to the capacitor and the energy release means in a fixed direction, and this efficiency can be maximized. It has the excellent effect of completely eliminating static electricity.

At that time, there is no risk that static electricity will remain locally or that new causes of static electricity will occur, and it can be wiped out in just the right amount.

Furthermore, since the above-mentioned circuit can be incorporated into the contact terminal, the device is compact, and there is also the added advantage that installation is simple and does not require the trouble of burying the device, such as grounding.

Furthermore, if a Zener diode is used as the energy emitting means, it is advantageous in that it can flexibly respond to changes in the amount of electrostatic charge on the object over time.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. A, B...Contact terminal C...Capacitor D...
Energy conversion means E...Bridge circuit

Claims (1)

[Claims] 1) Contact terminals A and B that come into contact with an object charged with static electricity are arranged, and a capacitor C that stores and holds the voltage due to the static electricity generated between the contact terminals, and a capacitor C that stores and holds the voltage due to the static electricity generated between the contact terminals, and A bridge circuit E, which is connected in parallel with an energy emitting means D that emits electrical energy, and a bridge circuit E that combines a rectifying element that applies voltage to the capacitor C in a fixed direction, is connected between the terminals. Device. 2) The static electricity eliminator according to claim 1, wherein the energy emitting means D is a Zener diode.