JPH0878183A - Static eliminator - Google Patents

Abstract

PURPOSE: To detect an inter-electrode reactive current or a reactive current between an electrode and an equipment body to precisely control ion generation by providing an external ground part and an external grounding resistor, and entirely gently increasing and decreasing the high voltage imparted to each discharge electrode. CONSTITUTION: A positive side effective static eliminating current I1+ carried form a positive side discharge electrode 1 to the outer part of a static eliminator is reflexed from an external ground part 10 to the electrode 1 through an external grounding resistor 11, a discharge current detecting resistor 8 and the secondary side coil of a positive side transformer 5. The negative side effective static eliminating current I1- carried from the outer part of the static eliminating device to a negative side discharge electrode 2 is refluxed to the part 10 through the resistor 11. While the overall time change of both high voltages V+ , V- imparted to each electrode 1, 2 are made relatively gentle, the voltages V+ , V- are controlled so that either one of the voltages V+ , V- is minutely fluctuated by a minute time. Thus, the positive and negative side effective static eliminating currents I1+ , I1- and the positive and negative side electrode-cage body reactive currents I2+ , I2- can be detected by a prescribed expression, and ion generation can be precisely controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static eliminator for neutralizing a charged body.

[0002]

2. Description of the Related Art A static eliminator for eliminating static electricity from a charged body applies a positive high voltage to a positive side discharge electrode from a positive side high voltage generation circuit via a positive side transformer and is installed in parallel with the positive side discharge electrode. A negative high voltage is applied from the negative side high voltage generation circuit to the generated negative side discharge electrode via the negative side transformer, whereby each discharge electrode is discharged to generate positive and negative ions in the atmosphere, and the positive and negative The charged ions are removed by the generated ions. In such a static eliminator, each high voltage generating circuit and transformer are housed in a casing made of a conductive material such as metal or an insulating material such as plastic, and the discharge electrodes are projected outward from the casing. . Further, circuits such as a high-voltage generation circuit and a transformer housed inside the housing are usually grounded to an external grounding portion provided at a proper place outside the housing, and particularly when the housing is made of a conductive material, It is grounded to an external grounding part through the housing.

In order to surely remove the charge of the charged body by using this type of charge removing device, it is necessary to balance the positive and negative ion generation amounts (so-called ion balance) due to the discharge of each discharge electrode. In general, the amount of generated ions is constant even if the high voltage applied to each discharge electrode is constant, the degree of contamination of each discharge electrode, environmental conditions such as atmospheric conditions, or the casing is made of a conductive material or an insulating material. It changes depending on the situation.
Therefore, it is necessary to control the ion balance by grasping the positive and negative ion generation amounts momentarily by some method and controlling the high voltage applied to each discharge electrode by each high voltage generation circuit accordingly.

As a static eliminator for performing such ion balance control, for example, Japanese Patent Laid-Open No. 3-266398.
The one disclosed in the publication is known.

In this static eliminator, a needle-like needle for detecting an ion current corresponding to the difference between the amount of positive ions and the amount of negative ions is provided between the positive side discharge electrode and the negative side discharge electrode. A current detection electrode is arranged. Then, when controlling the ion balance, a positive high voltage and a negative high voltage are alternately applied to the positive side discharge electrode and the negative side discharge electrode from the high voltage generating circuit, and the current is applied when each high voltage is applied. Ion current is detected through the detection electrode.

In this case, when the high voltage is applied to one discharge electrode, the application of the high voltage to the other discharge electrode is stopped, so that the ions detected at the time of applying each high voltage The electric current corresponds to the amount of ions produced by the discharge of each discharge electrode. Therefore, in the static eliminator, the ion currents detected at the time of applying each high voltage are grasped as positive and negative ion generation amounts, and they are compared with each other, and both are matched according to their magnitude relationship. In addition, the ion balance is controlled by increasing or decreasing the high voltage generated by one high voltage generating circuit or both high voltage generating circuits.

In this static eliminator, as described above, the pulse static erasing is performed in which a positive high voltage and a negative high voltage are alternately and continuously applied from the high voltage generating circuit to the positive side discharge electrode and the negative side discharge electrode. It is possible to select the mode and the DC static elimination mode in which a positive and negative high voltage is continuously applied to both discharge electrodes simultaneously.However, even in the DC static elimination mode, when controlling the ion balance, the pulse static elimination mode is selected periodically. It is executed to control the ion balance as described above. Further, in this static eliminator, when the ionic current detected at the time of applying each high voltage falls below a predetermined value, the discharge is stopped or an alarm indicating that cleaning of each discharge electrode is necessary is issued. I have to.

However, the static eliminator has the following disadvantages.

That is, the ion current detected through the current detection electrode is a minute current due to a small amount of generated ions of the positive and negative total ions generated at the time of discharge of each discharge electrode. Does not always correspond to the total amount of generated ions, and is easily affected by environmental conditions such as dirt on the current detection electrodes and atmospheric conditions. Therefore, even if the positive and negative ion currents detected through the current detection electrodes are balanced, the positive and negative ion generation amounts are not always balanced as a whole. Further, since the current detection electrode is a thin needle-like electrode and is projected to the outside of the housing, it is easily bent, and if it is damaged in this way, a large amount of positive or negative ion current is detected. As a result, the ion balance cannot be controlled.

Further, the positive and negative total ion current or the total ion generation amount basically depends on the discharge current flowing through each discharge electrode. However, according to the knowledge of the present inventors, generally, The discharge current of each discharge electrode can reach the charged body disposed in front of both discharge electrodes, in other words, the effective charge removal current that generates ions that contribute to charge removal of the charged body, as well as between the discharge electrodes. There is a current between the electrodes that flows in the case, and when the case is made of a conductive material, there is a current between the electrodes and the case that flows between each discharge electrode and the case. In this case, the current between the electrodes and the case and the current between the electrodes generate ions that flow between the electrodes and the case and between the electrodes, respectively, so that these currents do not generate ions that contribute to static elimination. It is an electric current. Therefore, in order to control the ion balance in order to surely remove the charge from the charged body, it is necessary to balance the total amount of positive and negative ions generated by the effective charge removing current.

However, in the static eliminator of the above publication, the current detection electrode is simply arranged between the two discharge electrodes, so that the effective static neutralization is applied to the ion current detected by the current detection electrode. Not only the current, but the electrode
In many cases, a part of the reactive current between the housings and the reactive current between the electrodes is also included, so that it is difficult to accurately control the ion balance.

[0012]

DISCLOSURE OF THE INVENTION The present invention aims to improve a static eliminator, and produces positive and negative ions which substantially contribute to the static elimination of a charged body in the discharge current flowing through the positive and negative discharge electrodes. It is an object of the present invention to provide a static eliminator that can detect an effective static elimination current that is generated and that can accurately control the generation of positive and negative ions that contribute to static elimination.

Another object of the present invention is to provide a static eliminator capable of detecting a reactive current between electrodes flowing between electrodes and a reactive current between electrodes and a casing flowing between electrodes and a casing.

Another object of the present invention is to provide a static eliminator capable of detecting the effective static elimination current and the reactive current with a simple structure.

Another object of the present invention is to provide a static eliminator capable of accurately and surely controlling the ion balance of positive and negative generated ions based on the detected effective static elimination current.

Another object of the present invention is to provide a static eliminator capable of accurately monitoring the operating state of the device based on the detected effective static elimination current or reactive current.

[0017]

The first aspect of the present invention is as follows.
In order to achieve the above-mentioned object, a positive side discharge electrode and a negative side discharge electrode, a positive side transformer and a negative side transformer in which one end of a secondary side coil is connected to each discharge electrode, and a transformer A positive-side high-voltage generating circuit and a negative-side high-voltage generating circuit that generate and apply a positive high voltage and a negative high voltage to each discharge electrode, and the discharge electrode facing outward, the transformer, and the high voltage. In a static eliminator provided with a case made of a conductive material that houses a voltage generation circuit, the other ends of the secondary side coils of the positive side transformer and the negative side transformer, which are the ground ends, are connected to each other, and the connecting portion is connected. It is connected to an external grounding portion outside the casing through an external grounding resistance, and further, the casing is connected to a connecting portion of the grounding ends of the secondary side coils of both transformers, and flows when each discharge electrode discharges. Of the current, contributes to static elimination Difference positive effective charge removing current generates an on (I ₁₊₎ and negative effective charge removing current (I _1-) (Ia = I
₁₊ −I ₁₋ ) by means of an effective current difference detecting means for detecting the voltage generated in the external grounding resistance, and a positive side high voltage (V ₊ ) applied to each discharge electrode by each high voltage generating circuit.
And the rate of change of the negative high voltage (V ₋ ) with time (dV ₊ / dt
And dV _- / dt) is

[0018]

[Equation 11]

The relationship ( ₁ ) is repeatedly satisfied for each minute time, and the change amounts (ΔV ₊ , ΔV ₋ ) of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) within the minute time are ΔV _+. «V ₊ and ΔV _- «V _- a high voltage control means for controlling each high voltage generating circuit so as to satisfy the relation ... (2), both obtained by the effective current difference detection means in said short time Effective static elimination current (I ₁₊ ,
Differentiating means for obtaining the temporal change rate (dIa / dt) of the difference (Ia) of I ₁₋ ) and the effective static elimination currents (I ₁₊ , I ₁₋ )
One of the effective static elimination current (I ₁₊ or I _1- )

[0020]

[Equation 12]

The first effective static elimination current detecting means and the other effective static elimination current (I ₁₋ or I ₁₊ ) obtained by using the relational expression of
Is obtained by the difference (Ia = I ₁₊ −I ₁₋ ) between both effective static elimination currents (I ₁₊ , I ₁₋ ) obtained by the effective current difference detecting means and the first effective static elimination current detecting means. Second effective static charge elimination current detection means for obtaining by subtraction calculation or addition calculation from the positive side effective static charge elimination current (I ₁₊ ) or negative side effective static charge elimination current (I ₁₋ ) By controlling each effective static elimination current (I ₁₊ , I ₁₋ ) obtained by the above, generation of positive and negative ions contributing to static elimination is controlled.

Further, the casing is connected to the connection portion of the grounding ends of the secondary side coils of both the transformers via a casing grounding resistance, and the positive side discharge electrode of the current flowing at the time of discharge of each discharge electrode is connected. And a positive side electrode flowing between the negative side discharge electrode and the case, a reactive current (I ₂₊ ) between the case and the negative side electrode, respectively.
An electrode / chassis reactive current difference detection means for detecting a difference (Ib = I ₂₊ −I ₂₋ ) in the reactive current (I _{2 −} ) between the casings by the voltage generated in the casing grounding resistance, and the minute Temporal change rate (dIb / dt) of the difference (Ib) between the reactive currents (I ₂₊ , I ₂₋ ) between the electrodes and the housing obtained by the reactive current difference detecting means between the electrodes and the housing within the time. A second differentiating means for obtaining the reactive current (I ₁₊ or I ₂₋ ) between one of the electrodes and the casing (I ₂₊ , I ₂₋ )

[0023]

[Equation 13]

The first electrode-chassis reactive current detecting means and the other electrode-chassis reactive current (I
_2- or I ₂₊ ) is a reactive current (I ₂₊ , I ₂₊ ,
I _{2 −} ) difference (Ib = I ₂₊ −I _{2 −} ) and the positive electrode-chassis reactive current (I ₂₊ ) obtained by the first electrode-chassis reactive current detection means, or Second obtained by subtraction calculation or addition calculation from the negative current between the negative electrode and the housing (I ₂₋ ).
And a reactive current detecting means between the electrode and the case.

Further, at least one of the discharge electrodes
Total discharge current (I _{S +}Or I_S-) Is detected
And a discharge current detecting means for
Total discharge current (I_{S +}Or I_S-) To respond to this
The effective static elimination current (I₁₊Or I_1-) And no electrode / case
Effective current (I₂₊Or I_2-) By subtracting
Electrode reactive current (I₃) Seeking electrode
And a reactive current detecting means.

In order to achieve the above-mentioned object, the second aspect of the present invention comprises a positive side discharge electrode and a negative side discharge electrode, and a positive side discharge electrode connected to one end of a secondary side coil. A side transformer and a negative side transformer, a positive side high voltage generation circuit and a negative side high voltage generation circuit that generate and apply a positive high voltage and a negative high voltage to each discharge electrode through each transformer, and the discharge electrode. In a static eliminator provided with the discharge electrode, the transformer, and a housing made of a conductive material that accommodates a high-voltage generating circuit facing outward, at a grounding end of a secondary coil of the positive transformer and the negative transformer. The other ends are connected to each other through a pair of external grounding resistors connected in series, and the middle point of both external grounding resistors is connected to an external external grounding portion of the casing, and at least one of Grounding the secondary coil of the transformer And the connecting the housing to the connecting portion of the external grounding resistance, among the current flowing during the discharge of each discharge electrode, the positive effective charge removing current for generating the ions contributing to the neutralization (I ₁₊₎ and negative Effective static elimination current (I _1- ) difference (Ia =
I ₁₊ −I ₁₋ ) based on the difference in voltage generated between the pair of external grounding resistors, and an effective current difference detecting means,
The temporal change rates (dV ₊ / dt and dV ₋ / dt) of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) applied to the discharge electrodes by the high voltage generating circuits are

[0027]

[Equation 14]

The relationship of (3) is repeatedly satisfied for each minute time, and the change amounts (ΔV ₊ , ΔV ₋ ) of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) within the minute time are ΔV ₊ «V ₊ and ΔV _- «V _- a high voltage control means for controlling each high voltage generating circuit so as to satisfy the relation ... (2), both obtained by the effective current difference detection means in said short time Effective static elimination current (I ₁₊ ,
Differentiating means for obtaining the temporal change rate (dIa / dt) of the difference (Ia) of I ₁₋ ) and the effective static elimination currents (I ₁₊ , I ₁₋ )
One of the effective static elimination current (I ₁₊ or I _1- )

[0029]

(Equation 15)

The first effective static elimination current detection means and the other effective static elimination current (I ₁₋ or I ₁₊ ) obtained by using the relational expression of
Is obtained by the difference (Ia = I ₁₊ −I ₁₋ ) between both effective static elimination currents (I ₁₊ , I ₁₋ ) obtained by the effective current difference detecting means and the first effective static elimination current detecting means. Second effective static charge elimination current detection means for obtaining by subtraction calculation or addition calculation from the positive side effective static charge elimination current (I ₁₊ ) or negative side effective static charge elimination current (I ₁₋ ) By controlling each effective static elimination current (I ₁₊ , I ₁₋ ) obtained by the above, generation of positive and negative ions contributing to static elimination is controlled.

Further, the casings are connected to the connecting portions of the grounding ends of the secondary side coils of both the transformers and the pair of external grounding resistors through the respective casing grounding resistors, and each discharge is performed. Among the currents that flow when the electrodes are discharged, the reactive current (I ₂₊ ) between the positive side electrode and the case and the negative side electrode and the case that respectively flow between the positive side discharge electrode and the negative side discharge electrode and the case. An electrode / casing reactive current difference detecting means for detecting a difference (Ib = I ₂₊ −I ₂₋ ) in the reactive current (I ₂₋ ) based on a voltage difference generated in the resistance for grounding each casing, and the minute Temporal change rate (dIb / dt) of the difference (Ib) between the reactive currents (I ₂₊ , I ₂₋ ) between the electrodes and the housing obtained by the reactive current difference detecting means between the electrodes and the housing within the time. a second differentiating means for obtaining the said two electrodes, the inter-chassis reactive current (I _2+, I _2-) one electrode-housing of Disable current (I ₂₊ or I _2-)

[0032]

[Equation 16]

The first electrode-chassis reactive current detection means and the other electrode-chassis reactive current obtained by using the relational expression of are obtained by the electrode-chassis reactive current difference detection means. Difference (Ib) between reactive currents (I ₂₊ , I _{2 −} ) between both electrodes and case
= I ₂₊ −I ₂₋ ) and the reactive current between the positive electrode and the housing (I ₂₊ ) obtained by the first-electrode-to-housing reactive current detection means.
Alternatively, it is provided with a second electrode-casing reactive current detection means which is obtained by subtraction calculation or addition calculation from the negative side electrode-casing reactive current (I ₂₋ ).

Further, at least one of the discharge electrodes
Total discharge current (I _{S +}Or I_S-) Is detected
And a discharge current detecting means for
Total discharge current (I_{S +}Or I_S-) To respond to this
The effective static elimination current (I₁₊Or I_1-) And no electrode / case
Effective current (I₂₊Or I_2-) By subtracting
Electrode reactive current (I₃) Seeking electrode
And a reactive current detecting means.

In order to achieve the above-mentioned object, a third aspect of the present invention is a positive side discharge electrode and a negative side discharge electrode, and a positive side discharge electrode connected to one end of a secondary side coil. A side transformer and a negative side transformer, a positive side high voltage generation circuit and a negative side high voltage generation circuit that generate and apply a positive high voltage and a negative high voltage to each discharge electrode through each transformer, and the discharge electrode. In a static eliminator provided with the discharge electrode, the transformer, and a housing made of an insulating material that houses a high-voltage generation circuit toward the outside, at a grounding end of a secondary coil of the positive transformer and the negative transformer. While connecting the other ends to each other, the connecting portion is connected to an external grounding portion outside the casing via an external grounding resistance, and among the currents flowing at the time of discharge of each discharge electrode, ions that contribute to static elimination are selected. Positive side effective charge removal to be generated (I ₁₊₎ and negative effective charge removing current (I
₁₋ ) difference (Ia = I ₁₊ −I ₁₋ ) is detected by the voltage generated in the external grounding resistor, and the high voltage generating circuit is provided to each discharge electrode. The positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) change rate with time (dV ₊ / dt and dV ₋ / dt)

[0036]

[Equation 17]

The above relationship is repeatedly satisfied for each minute time, and the change amounts (ΔV ₊ , ΔV ₋ ) of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) within the minute time are ΔV _+. «V ₊ and ΔV _- «V _- a high voltage control means for controlling each high voltage generating circuit so as to satisfy the relation ... (2), both obtained by the effective current difference detection means in said short time Effective static elimination current (I ₁₊ ,
Differentiating means for obtaining the temporal change rate (dIa / dt) of the difference (Ia) of I ₁₋ ) and the effective static elimination currents (I ₁₊ , I ₁₋ )
One of the effective static elimination current (I ₁₊ or I _1- )

[0038]

(Equation 18)

The first effective static elimination current detecting means and the other effective static elimination current (I ₁₋ or I ₁₊ ) obtained by using the relational expression of
By the difference (Ia = I ₁₊ −I ₁₋ ) between both effective static elimination currents (I ₁₊ , I ₁₋ ) obtained by the effective current difference detection means, and the first effective static elimination current detection means. A second effective static elimination current detection means for obtaining by subtraction calculation or addition calculation from the obtained positive side effective static elimination current (I ₁₊ ) or negative side effective static elimination current (I ₁₋ ) is provided, and each effective static elimination current detection means is provided. By controlling each effective static elimination current (I ₁₊ , I ₁₋ ) obtained by the above, generation of positive and negative ions contributing to static elimination is controlled.

Further, in order to achieve the above-mentioned object, the fourth aspect of the present invention is a positive side discharge electrode and a negative side discharge electrode, and a positive side electrode formed by connecting one end of a secondary side coil to each discharge electrode. A side transformer and a negative side transformer, a positive side high voltage generation circuit and a negative side high voltage generation circuit that generate and apply a positive high voltage and a negative high voltage to each discharge electrode through each transformer, and the discharge electrode. In a static eliminator provided with the discharge electrode, the transformer, and a housing made of an insulating material that houses a high-voltage generation circuit toward the outside, at a grounding end of a secondary coil of the positive transformer and the negative transformer. The other ends are connected to each other through a pair of external grounding resistors connected in series, and the middle point of both external grounding resistors is connected to an external grounding portion outside the casing to discharge each discharge electrode. Of the current that flows sometimes, contributes to static elimination Difference positive effective charge removing current generates an on (I ₁₊₎ and negative effective charge removing current (I _1-) (Ia = I
₁₊ −I ₁₋ ) based on the difference between the voltages generated in the pair of external grounding resistors, and the positive high voltage ( ₊ ) applied to the discharge electrodes by the high voltage generating circuits. V ₊₎ and the negative side high voltage (V _- temporal change rate of) (d
V ₊ / dt and dV _- / dt) is

[0041]

[Formula 19]

The relationship of (3) is repeatedly satisfied for each minute time, and the change amounts (ΔV ₊ , ΔV ₋ ) of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) within the minute time are ΔV _+. «V ₊ and ΔV _- «V _- a high voltage control means for controlling each high voltage generating circuit so as to satisfy the relation ... (2), both obtained by the effective current difference detection means in said short time Effective static elimination current (I ₁₊ ,
Differentiating means for obtaining the temporal change rate (dIa / dt) of the difference (Ia) of I ₁₋ ) and the effective static elimination currents (I ₁₊ , I ₁₋ )
One of the effective static elimination current (I ₁₊ or I _1- )

[0043]

[Equation 20]

The first effective static elimination current detecting means and the other effective static elimination current (I ₁₋ or I ₁₊ ) obtained by using the relational expression of
Is obtained by the difference (Ia = I ₁₊ −I ₁₋ ) between both effective static elimination currents (I ₁₊ , I ₁₋ ) obtained by the effective current difference detecting means and the first effective static elimination current detecting means. A second effective static elimination current detecting means for obtaining by subtraction calculation or addition calculation from the positive side effective static elimination current (I ₁₊ ) or negative side effective static elimination current (I _1- ) is provided. By controlling each of the obtained effective static elimination currents (I ₁₊ , I _1- ),
It is characterized by controlling the generation of positive and negative ions that contribute to static elimination.

Further, in the third or fourth aspect, there is provided discharge current detecting means for detecting the total discharge current (I _{S +} or I _S- ) of at least one of the discharge electrodes, and By subtracting the effective static elimination current (I ₁₊ or I _1- ) from the total discharge current (I _{S +} or I _S- ) obtained by the discharge current detection means, the inter-electrode reactive current ( I ₃ ), and an inter-electrode reactive current detecting means.

Further, in each of the above aspects, each of the high-voltage generating circuits has a high voltage (V) corresponding to the positive-side high-voltage instruction value and the negative-side high-voltage instruction value provided from the high-voltage control means.
₊ , V ₋ ), wherein the high-voltage control means generates the positive-side high-voltage instruction value and the negative-side high-voltage instruction value as substantially constant within a small time including the minute time. The side instruction value generating means and the negative side instruction value generating means, and the minute fluctuations in the positive side high voltage instruction value or the negative side high voltage instruction value generated by the positive side instruction value generating means or the negative side instruction value generating means. And a positive side high voltage instruction value or a negative side high voltage instruction value, which causes a minute fluctuation by the instruction value processing means, is applied to the corresponding high voltage generation circuit. At the same time, another high voltage instruction value is given to the corresponding high voltage generation circuit from the negative side instruction value generating means or the positive side instruction value generating means, whereby the relationship of (1) and (2) is satisfied. Control each high-voltage generation circuit to meet And wherein the door.

Further, the minute fluctuation of the positive side high voltage instruction value or the negative side high voltage instruction value by the instruction value processing means is caused by the positive side high voltage (V ₊ ) in the relational expressions (3) and (4).
And the ratio of the temporal change rate dV ₊ / dt or the ratio of the negative high voltage (V ₋ ) to the temporal change rate dV ₋ / dt is an exponential minute fluctuation. The first effective static elimination current detecting means sets the value of the ratio in the relational expressions (3) and (4) to a constant value, and the temporal change rate (dIa / dt) obtained by the differentiating means. Depending on the positive side effective static elimination current (I ₁₊ ) or the negative side effective static elimination current (I
_1- ) is required.

Further, the positive side instruction value generating means and the negative side instruction value generating means generate the positive side high voltage instruction value and the negative side high voltage instruction value as an instruction value signal of a level corresponding to the positive side high voltage instruction value and the negative side high voltage instruction value, respectively. The indicator value processing means is characterized in that a time constant circuit composed of a resistor and a capacitor is used to cause an exponential minute fluctuation in the level of the indicator value signal.

[0049]

According to the first aspect of the present invention, the positive effective discharge current (I ₁₊ ) and the negative effective discharge current (I _1- ) are applied to the external grounding resistor when the discharge electrodes are discharged. Difference of (Ia
= I ₁₊ -I _1- ) (current will be described later in detail in the embodiments). Therefore, by detecting the voltage of the external grounding resistor by the effective current difference detecting means, the difference (Ia) between the two effective charge eliminating currents is detected. Also,
When the high voltage control circuit controls each of the high voltage generation circuits so as to satisfy the relationships (1) and (2), the relational expression (3) or (4) is satisfied (details will be described later). Examples will be described). Therefore, by the differentiating means, the temporal change rate (dIa / d) of the difference (Ia) between the two effective static elimination currents.
If t) is obtained, the positive side effective static elimination current (I ₁₊ ) and the negative side effective static elimination current (I ₁ ) are calculated from the temporal change rate (dIa / dt) using the relational expression of (3) or (4). _- ) Of one of the obtained effective static elimination currents (I ₁₊ or I _1- ) and the difference (Ia) between the two effective static elimination currents can be calculated by subtraction or addition. It is possible to obtain the other effective charge removal current (I ₁₋ or I ₁₊ ).
Then, each effective static elimination current obtained in this way is
Since it indicates the total amount of positive and negative ions contributing to static elimination, it is possible to control the generation of positive and negative ions contributing to static elimination by controlling the obtained effective static elimination current.

The value of the ratio between the high voltage (V ₊ or V ₋ ) and the time rate of change (dV ₊ / dt or dV ₋ / dt) in the equations (3) and (4) is directly It is also possible to obtain a constant value or a constant value as described later.

In this case, the housing grounding resistor is further added.
When provided, the positive electrode /
Reactive current between enclosures (I₂₊) And the negative current between the negative electrode and the housing
(I _2-) Difference (Ib = I₂₊-I_2-Current equivalent to
(Details will be described in Examples below). Because of this, before
The case is connected to the case by the means for detecting the reactive current difference between the electrode and the case.
By detecting the voltage of the earth resistance, invalid between both electrodes and the case
The current difference (Ib) is detected. Then, the above (1),
Under the condition of (2), the relational expression of the above (5) or (6) is
It is established (details will be described in the examples below). Therefore,
By the second differentiating means, the reactive current between both electrodes and the housing is
Find the temporal change rate (dIb / dt) of the difference (Ib)
For example, from the time change rate (dIb / dt),
Or using the relational expression of (6), the reactive current between the positive electrode and the case
(I₂₊) And the negative current between the negative electrode and the housing (I_2-) One side
It is possible to obtain the
Reactive current between pole and case (I₂₊Or I_2-) And both electrodes
Subtraction operation or addition operation from the difference (Ib) of reactive current between cases
The reactive current (I_2-Or I₂₊)
It becomes possible to ask.

Further, at least one of the discharge electrodes
Total discharge current (I _{S +}Or I_S-) Is detected
And a discharge current detecting means for
Effective static elimination current (I₁₊Or I_1-) And electrode / casing
Interbody reactive current (I₂₊Or I_2-) By the discharge current detection means
Total discharge current (I_{S +}Or I_S-) Can be subtracted from
And the reactive current between electrodes (I₃) Is possible
It

Next, according to a second aspect of the present invention,
The difference in voltage between the pair of external grounding resistors is
Current (I₁₊) And the negative side effective static elimination current (I_1-) Difference (Ia
= I ₁₊-I_1-) (Details described later
Explained in the example). Therefore, the active current difference detection
A step detects the voltage difference between the pair of external grounding resistors.
By doing so, the difference (Ia) between the two effective charge eliminating currents is detected.
Even in this case, the above-mentioned conditions (1) and (2)
Under the conditions, the relational expression of (3) or (4) is established and
Then, as in the first aspect, each effective static elimination current (I_1-, I
₁₊) Can be obtained. And the effective charge removal
Flow (I_1-, I₁₊) Is controlled to positively contribute to static elimination.
It is possible to control the production of negative ions.

In this case, furthermore, the casings are connected to the connecting portions of the grounding ends of the secondary side coils of the both transformers and the pair of external grounding resistors through the respective casing grounding resistors. Sometimes, the difference in voltage between the resistors for grounding the casings is the difference (Ib = I) between the reactive current (I ₂₊ ) between the positive electrode and the casing and the reactive current (I ₂₋ ) between the negative electrode and the casing. _{2 +} -I ₂₋ ) (details will be described in Examples below). Then, in this way, the difference (Ib) in the reactive current between both electrodes and the housing
If the above is obtained, the above (1),
Under the condition of (2), it becomes possible to obtain the reactive current (I ₂₋ , I ₂₊ ) between each electrode and the housing by using the relational expressions of (5) and (6).

Further, as described above, each effective static elimination current (I _1- , I ₁₊ ) and each electrode-chassis reactive current (I _2- , I).
₂₊ ) is obtained, the inter-electrode reactive current (I ₃ ) is detected by detecting the total discharge current (I _{S +} or I _S− ) of either one of the discharge electrodes, as in the first aspect. It becomes possible to ask. Further, if the total discharge current (I _{S +} and I _S- ) of each discharge electrode is detected as in the case of the first aspect, the total discharge current (I _{S +} , I _S- ) and the effective discharge current (I _{1 -} , I ₁₊ ) makes it possible to obtain the total reactive current of each discharge electrode.

In the first and second aspects of the present invention,
And the total discharge current (I _{S +}, I_S-) Is an analogy
For example, in series with the secondary coil of the transformer corresponding to the discharge electrode.
A discharge current detection resistor connected to the
Total discharge current due to voltage generated in resistance for current detection
(I_{S +}, I_S-) Can be detected. There
In the second aspect of the present invention, is the pair of housing contacts.
When equipped with a ground resistance, for example, the same transformer
For external grounding of one side connected to the grounding end of the secondary coil of
The sum of the voltage generated in the resistance and the resistance for grounding the chassis
Total discharge current (I_{S +}Or I_S-) Is detected
It is possible to

Further, in the first and second aspects of the present invention, if both of the total discharge currents (I _{S +} and I _S- ) of the respective discharge electrodes are detected, the respective total discharge currents (I _{S +} , I _{S +} ) are detected. _- ) _Is subtracted from each effective static elimination current (I ₁₊ , I _1- ) obtained as described above to obtain a reactive current (I ₂₊ , I ₂₊ , between the electrodes and the housing ₎ .
It is possible to obtain the total reactive current of each discharge electrode, which is a combination of I ₂₋ ) and the interelectrode reactive current (I ₃ ).

Next, according to a third aspect of the present invention, the positive side effective static elimination current (I ₁₊ ) and the negative side effective static elimination are applied to the external grounding resistor, as in the first aspect. Current (I _1- )
Current (Ia = I ₁₊ −I ₁₋ ) corresponding to the difference (Ia = I ₁₊ −I ₁₋ )
I ₁₊ −I ₁₋ ) is detected. Therefore, similar to the first aspect, under the conditions (1) and (2), the (3),
Each effective static elimination current (I _1- ,
I ₁₊ ) can be obtained. Then, by controlling the effective charge removal currents (I ₁₋ , I ₁₊ ), it becomes possible to control the generation of positive and negative ions that contribute to charge removal. still,
In this case, since the case is made of an insulating material, no current flows between the electrode and the case, and it is not necessary to connect the case to the transformer or the like.

Further, according to the fourth aspect of the present invention, the difference in voltage between the pair of external grounding resistors is the same as in the second aspect, and the positive side effective static elimination current (I ₁₊ ) and It corresponds to the difference (Ia = I ₁₊ −I ₁₋ ) between the negative side effective static elimination currents (I ₁₋ ), and the difference between the two effective static elimination currents (Ia = I ₁ −) due to the voltage difference between the two external grounding resistors ₊ −I ₁₋ ) is detected. Therefore, similar to the first, second or third aspect, the above (1),
Under the condition of (2), it becomes possible to obtain each effective static elimination current (I ₁₋ , I ₁₊ ) using the relational expressions of (3) and (4). Then, by controlling the effective charge removal currents (I ₁₋ , I ₁₊ ), it becomes possible to control the generation of positive and negative ions that contribute to charge removal. In this case as well, as in the third aspect, no current flows between the electrode and the case, and it is not necessary to connect the case to the transformer or the like.

Further, in the third or fourth aspect, discharge current detecting means for detecting the total discharge current (I _{S +} or I _S- ) of at least one of the discharge electrodes is provided. The total discharge current (I _{S +} or I
By subtracting the effective static elimination current (I ₁₋ or I ₁₊ ) from _S− ), the interelectrode reactive current (I ₃ ) can be obtained.

In the third or fourth aspect of the present invention, the total discharge current (I _{S +} , I _S- ) of each discharge electrode is, for example, serially connected to the secondary coil of the transformer corresponding to the discharge electrode. By providing the connected discharge current detection resistor, the total discharge current (I _{S +} ,
I _S- ) can be detected. Alternatively, in the fourth aspect, it is possible to detect the total discharge current (I _{S +} , I _S− ) of each discharge electrode by the voltage generated in each external grounding resistance.

In each of the above aspects, for example, the above
Positive side high voltage (V in the relational expressions (3) and (4)₊)When
The rate of change dV with time₊Value of ratio with / dt or negative high voltage
Pressure (V_-) And its rate of change dV with time_-Value of ratio with / dt
Is constant at least within the minute time
In addition, the positive high voltage (V
₊) Or negative high voltage (V_-) To change
For example, the value of the above ratio in the relational expressions (3) and (4) above
Can be set to a constant value in advance. this
By doing so, both of the above
Rate of change (dIa / d) of the difference (Ia) in effective static elimination current
From t), one effective static elimination current (I_1-Or I₁₊)
It is possible to obtain this, which is described in (5),
Using the relational expression (6), the reactive current (I_2-or
Is I₂₊) Is also the same.

Next, in each of the above aspects of the present invention, each of the high voltage generating circuits outputs a high voltage (a high voltage corresponding to the positive side high voltage instruction value and the negative side high voltage instruction value provided from the high voltage control means). V _+, V _-) when a circuit for generating the substantially within a small time including the minute time the positive high voltage instruction value and the negative side high voltage instruction value by the positive and negative indication value generating means The value is generated as a constant value, and minute fluctuations are repeatedly generated in the generated positive side high voltage instruction value or negative side high voltage instruction value by the instruction value processing means at the minute time intervals. Then, the positive side high voltage instruction value or the negative side high voltage instruction value that causes a minute change is given to the corresponding high voltage generation circuit, and the high voltage instruction value corresponding to another high voltage generation circuit is given to the negative side. It is given from the instruction value generating means or the positive side instruction value generating means. By doing so, it becomes possible to control each high voltage generation circuit so as to satisfy the relationships (1) and (2) with a relatively simple configuration.

In this case, the positive side high voltage indication value or the negative side
The minute fluctuations of the high voltage indication value may be regarded as exponential minute fluctuations.
And the positive high voltage in the relational expressions (3) and (4) above.
(V ₊) And its rate of change dV with time₊Value of ratio with / dt
Is the negative high voltage (V_-) And its rate of change dV with time_-/ Dt
The value of the ratio of
As described above, the electric current detecting means is provided with
From the time rate of change of difference (Ia) (dIa / dt),
One of the effective static elimination currents (I_1-Or I₁₊)
And are possible. This means that between the first electrode and the housing
Equipped with reactive current detection means,
Even when using the relational expressions (5) and (6)
It is the same.

The exponential minute fluctuation as described above can be generated with a simple circuit configuration by using a time constant circuit composed of a resistor and a capacitor.

[0066] Incidentally, the (3), (4) the relationship positive side high voltage (V ₊₎ and the ratio of the values or negative high voltage and the temporal change rate dV ₊ / dt in the formula _- (V) and The temporal change rate d
The value of the ratio to V ₋ / dt is the temporal change rate in the minute time of the positive side high voltage instruction value or the negative side high voltage instruction value that causes the minute variation by the instruction value processing means, and Since it is the value of the ratio to the positive side high voltage instruction value or the negative side high voltage instruction value within the time, it is also possible to obtain the value of the ratio by calculation. Then, if the value of the ratio is calculated in this way, the calculated ratio value is multiplied by the rate of temporal change (dIa / dt) of the difference (Ia) between the two effective static elimination currents to obtain the above ( One of the effective static elimination currents (I ₁₋ or I ₁₊ ) can be obtained by the relational expressions 3) and (4). This also applies to the case where the reactive current between the electrode and the housing is obtained using the relational expressions (5) and (6).

When each of the above modes is provided with the indicated value generating means and the indicated value processing means, the generation of positive and negative ions can be controlled as follows, for example. That is, for example, the set value of the positive side effective static elimination current and the negative side effective static elimination current is instructed to the high voltage control means, and the set value and each effective static elimination current (I ₁₊ and I
_1- ), the positive-side high-voltage instruction value and the negative-side high-voltage instruction value are generated so as to increase or decrease in the direction in which the deviations are eliminated. At this time, the high-voltage instruction value and the negative-side high-voltage instruction value are gradually increased and decreased so that the positive-side high-voltage instruction value and the negative-side high-voltage instruction value become substantially constant within a small time including the minute time. . By doing this,
While satisfying the conditions (1) and (2) necessary for obtaining the positive side effective static elimination current and the negative side effective static elimination current, it becomes possible to control each effective static elimination current to the set value.
It is possible to control the generation amount of positive and negative ions that contribute to static elimination to the generation amount indicated by the set value of each effective static elimination current.

In this case, in particular, the positive and negative ions generated by the positive side effective static elimination current (I ₁₊ ) and the negative side effective static elimination current (I _1- ) are balanced at a predetermined ratio. By setting the set values of the positive side effective static elimination current (I ₁₊ ) and the negative side effective static elimination current (I ₁₋ ), it is possible to balance the total amount of positive and negative ions that contribute to the elimination of static electricity. It is possible to surely remove the charge from the charged body.

Further, in each of the above aspects, when the indicator value generating means and the indicator value processing means are provided, for example, when each of the high voltage instruction values exceeds a predetermined set value, an alarm is issued. It is possible to monitor whether or not there is an abnormality such as dirt on each discharge electrode.

Further, in the case of detecting the reactive current between the electrodes and the case or the reactive current between the electrodes, when the reactive current between the electrodes and the case or the reactive current between the electrodes exceeds a predetermined set value, an alarm is issued. You may make it emit.

[0071]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the basic principle of each of the first to fourth aspects of the present invention will be described with reference to FIGS. 1 to 4
FIG. 3 is an explanatory diagram for explaining a basic configuration of the static eliminator according to the first aspect, the second aspect, the third aspect, and the fourth aspect of the present invention, respectively.

Referring to FIG. 1, reference numerals 1 and 2 denote a positive side discharge electrode and a negative side discharge electrode, and 3 and 4 denote a positive side discharge electrode 1 and a negative side discharge electrode 2, respectively, and a positive side transformer 5 and a negative side transformer. A positive side high voltage generation circuit and a negative side high voltage generation circuit that generate and give a positive high voltage V ₊ and a negative high voltage V ₋ via 6, and 7 are discharge electrodes 1 and 2, high voltage generation circuits 3 and 3. It is a housing that houses 4 and transformers 5 and 6. In this case, the housing 7
Is made of a conductive material such as metal, and the discharge electrode 1,
2 is an opening (not shown) provided on the front surface of the housing 7.
Is directed to the outside and the front of the housing 7 with a predetermined space therebetween. A mesh (not shown) is attached to the opening.

The discharge electrodes 1 and 2 are connected to one ends of the secondary side coils of the transformers 5 and 6, respectively, and the other ends of the secondary side coils of the transformers 5 and 6 which are grounding ends are respectively connected in series. It is connected via the discharge current detection resistors 8 and 9 connected to.

The middle point of the discharge current detecting resistors 8 and 9, which is the connection point of the secondary side coils of both transformers 5 and 6, is externally grounded to an external grounding portion 10 provided at a proper position outside the housing 7. It is connected via a housing resistor 11 and is further connected to the housing 7 via a housing grounding resistance 12.

A blower fan (not shown) that blows air toward the front of the discharge electrodes 1 and 2 is provided in the middle of the discharge electrodes 1 and 2.

In the static eliminator having such a structure, when the positive high voltage V ₊ and the negative high voltage V ₋ are applied to the discharge electrodes 1 and 2 by the high voltage generation circuits 3 and 4, respectively. 2 is discharged, and positive and negative ions are generated in the atmosphere by the discharge. Then, if the positive and negative generated ions reach the charged body (not shown) arranged in front of the discharge electrodes 1 and 2, and if the generation amount of the positive and negative ions reaching the charged body is balanced. , The charged body is discharged.

In this case, the discharge of each discharge electrode 1, 2
Basically, the total amount of positive and negative ions produced is
The discharge current (I
It depends on the on-current), but each discharge electrode
Total discharge current I flowing through 1 and 2 _{S +}, I_S-Each discharge electrode
Ion current between the 1 and 2 and the housing 7 made of a conductive material.
Reactive current between positive electrode and case that flows as leakage current
I₂₊And reactive current I between negative electrode and housing_2-And both discharge electrodes
The electric current flowing as an ionic current or a leakage current between 1 and 2
Interelectrode reactive current I₃And these reactive currents I₂₊, I_2-, I
₃Positive side effective static elimination current I excluding₁₊And negative side effective static elimination current
I_1-And are included. That is, I_{S +}= I₁₊＋ I₂₊＋ I₃…… (7) I_S-= I_1-＋ I_2-＋ I₃(8) Then, the above reactive current I₂₊, I_2-, I₃Is each discharge
Between the electrodes 1 and 2 and the housing 7, or between the discharge electrodes 1 and 2
Is it only to generate ions flowing between them?
Do not generate ions that contribute to the charge removal of the charged body.
Yes. In addition, each effective static elimination current I₁₊, I_1-Is each discharge
An ion current flows between the poles 1 and 2 and the outside of the static eliminator.
Therefore, each effective static elimination current I₁₊, I_1-Corresponding to
The positive and negative ions generated in this way contribute to the charge removal of the charged body.
It can be obtained (can reach the charged body). And this
The amount of positive and negative ions that contribute to the charge removal of the charged body is
Each effective static elimination current I₁₊, I_1-According to.

Therefore, by detecting the respective effective static elimination currents I ₁₊ and I _1- , it is possible to grasp and monitor the production amount of positive and negative ions that contribute to the static elimination of the charged body, and the effective static elimination currents I
By controlling ₁₊ and I ₁₋ , it is possible to control the amount of positive and negative ions that contribute to static elimination.

On the other hand, in the static eliminator having the above structure, as shown in FIG. 1, the total discharge currents I _{S +} and I _S- flowing through the discharge electrodes 1 and 2 flow through the discharge current detecting resistors 8 and 9, respectively. . Then, the total discharge current I _{S +} ,
A voltage proportional to I _S- is generated, so that the total discharge currents I _{S +} and I _S- are detected by the voltages of the resistors 8 and 9.

The positive effective discharge current I ₁₊ flowing from the positive discharge electrode 1 to the outside of the static eliminator is supplied from the external ground portion 10 to the external ground resistor 11, the discharge current detection resistor 8 and the positive transformer 5. It flows back to the positive side discharge electrode 1 via the secondary side coil. Similarly, the negative effective discharge current I ₁₋ flowing from the outside of the static eliminator to the negative discharge electrode 2 flows back to the external ground portion 10 via the external ground resistor 11. Therefore, the external grounding resistor 11 has a current I which is the difference between the effective static elimination currents I ₁₊ and I _1-.
a flows. That is, Ia = I ₁₊ −I ₁₋ (9) Then, the effective grounding currents I ₁₊ ,
A voltage proportional to the current Ia which is the difference of I ₁₋ is generated, and the resistance 1
The current Ia is detected by the voltage of 1.

Further, the current flows from the positive side discharge electrode 1 to the housing 7.
Reactive current between positive electrode and case I₂₊Is the case 7 to the case ground
Resistor 12, discharge current detection resistor 8 and positive side transformer 5
And returns to the positive side discharge electrode 1 via the secondary side coil. same
Similarly, the negative side electrode / casing flowing from the casing 7 to the negative side discharge electrode 2
Body reactive current I_2-Is the housing via the housing grounding resistor 12.
Reflux to 7. Therefore, the housing grounding resistor 12 is
Reactive current between pole and case I ₂₊, I_2-The difference current Ib flows
It That is, Ib = I₂₊-I_2- ...... (10) Then, the casing grounding resistor 12 has a reactive voltage between both electrodes and the casing.
Flow I₂₊, I_2-A voltage proportional to the current Ib of the difference of
The current Ib is detected by the voltage of the resistor 12.

The inter-electrode reactive current I ₃ flowing from the positive side discharge electrode 1 to the negative side discharge electrode 2 is the secondary side coil of the negative side transformer 6, the discharge current detecting resistors 9 and 8 and the positive side transformer 5.
And returns to the positive side discharge electrode 1 via the secondary side coil.

By the way, in general, each discharge electrode 1, 2
Positive and negative high voltage V applied₊, V_-Increase or decrease the
Depending on each effective static elimination current I₁₊, I_1-The discharge current of
In this case, positive and negative high voltage V₊, V_-Strange
Amount (increase / decrease) ΔV₊, ΔV _-Is high voltage V₊, V_-Large
In the range that is sufficiently smaller than the threshold value, the positive and negative high voltage V₊,
V_-Each effective static elimination current I in proportion to the increase or decrease of₁₊, I_1-Release of etc.
It is considered that the electric current increases and decreases. And the ratio in that case
An example constant is positive or negative high voltage V₊, V_-Minute change time
It is considered to be kept constant within.

That is, under the above conditions, the following expressions (11) to (14) are established.

[0085] _{I 1+ = k 1 · V +} ...... (11) I 2+ = k 2 · V + ...... (12) I 1- = k 3 · V - ...... (13) I 2- = k ₄ · V ₋ (14) In addition, k _{1 to} k ₄ are constant proportional constants.

Then, substituting these equations (11) to (14) into the equations (9) and (10), Ia = k ₁ · V ₊ −k ₃ · V ₋ (15) Ib = k ₂ · V ₊ −k ₄ · V ₋ ... (16) is obtained, and further, when both sides of the equations (15) and (16) are differentiated with respect to time,

[0087]

[Equation 21]

Is obtained. Here, under the above conditions,
For example, if (dV ₊ / dt) >> (dV ₋ / dt),
The second term on the right-hand side of equations (17) and (18) can be ignored, and therefore equations (17) and (18) are

[0089]

[Equation 22]

## EQU10 ## Therefore, the above (11), (19)
The relational expressions (3) and (5) are obtained from the expression set and the expression (12) and (20) sets, respectively.

Incidentally, for example, (dV ₊ / dt) << (dV ₋ /
dt), the relational expressions (4) and (6) are obtained in the same manner as in the above case.

Therefore, the high voltage applied to each discharge electrode 1, 2
Pressure V₊, V_-Change rate dV of₊/ Dt and dV_-/
dt) is the above-mentioned relational expression of (1) above (11)-(14)
Repeated in small time increments so that the proportional relationship of the equation holds.
In addition, the high voltage V within the minute time₊, V_-of
Change ΔV₊, ΔV_-Satisfies the relationship of the above formula (2)
In other words, in other words, the high voltage V₊, V_-Overall of both
One of the two
One high voltage V₊, V_-A minute fluctuation occurs in a minute time
High voltage V₊, V_-If you control
Using equations (3) and (5) or equations (4) and (6)
Positive side effective static elimination current I₁₊And the reactive current I between the positive electrode and the housing
₂₊, Or negative side effective static elimination current I_1-And negative electrode / case
Reactive current I _2-Can be detected momentarily and
Become.

In this case, "d" in the equations (3) and (4)
Ia / dt "can be obtained by obtaining the temporal change rate of the current Ia detected by the voltage of the external grounding resistor 11 within the minute time, and" dIb / "in the equations (5) and (6). dt ″ can be obtained by obtaining the temporal change rate of the current Ib detected by the voltage of the housing grounding resistor 12 within the minute time. Details will be described later, but (3) and (5). "V ₊ " and "dV ₊ / in the formula
dt "ratio value (hereinafter referred to as ratio value K ₊ ),
“V ₋ ” and “dV ₋ / dt” in the equations (4) and (6)
The value of the ratio (hereinafter, referred to as the ratio value K ₋ ) can be set to a predetermined constant value in advance.

In this way, one effective static elimination current I ₁₊ or I
_{If 1−} and one of the electrodes / housing reactive current I ₂₊ or I ₂₋ are detected, the other effective static elimination current I ₁₋ or I ₁₊ is calculated by using the equations (9) and (10). And the reactive current I ₂₋ or I ₂₊ between the other electrode and the housing can be obtained, and further, the reactive current I ₃ between the electrodes can be calculated by using either one of the equations (7) and (8). You can ask. That is, (dV ₊ / d
t) >> (dV ₋ / dt) and the effective static elimination current I ₁₊ on the positive side
When the reactive current I ₂₊ between the electrodes and the housing is obtained by using the equations (3) and (5), the effective static elimination current I ₁₋ on the negative side and the reactive current I _{2 −} between the electrodes and the housing are , (22) and (23) are subtracted.

I ₁₋ = I ₁₊ −Ia (22) I ₂ − = I ₂₊ −Ib (23) Similarly, (dV ₊ / dt) << (dV ₋ / dt) is set on the negative side. When the effective static elimination current I ₁₋ and the reactive current I _{2 −} between the electrode and the casing are calculated by using the equations (3) and (5), the effective static elimination current I _{1+ on the} positive side and the electrode / casing are calculated. The reactive current I ₂₊ between
4) and (25) are added.

I ₁₊ = I _1- + Ia (24) I ₂₊ = I ₂ + + Ib (25) Further, the inter-electrode reactive current I ₃ is given by the following (26), (2)
It is obtained by the operation of either one of the expressions 7).

I ₃ = I _{S +} −I ₁₊ −I ₂₊ (26) I ₃ = I _S− −I _{1 −} −I ₂ ··· (27) In this case, (22) to (27) “Ia”, “Ib”, “I _{S +} ”, and “I _S- ” in the equation are detected by the voltages generated in the external ground resistance 11, the housing ground resistance 12, and the discharge current detection resistances 8 and 9, respectively. It

As described above, both effective static elimination currents I ₁₊ , I _1-
If it is known, it is possible to grasp the amount of positive and negative ions that contribute to charge removal. Therefore, the above (1),
While satisfying the condition (2), both effective static elimination currents I ₁₊ , I _1-
(This control is performed by increasing / decreasing the high voltages V ₊ and V ₋ generated by the high voltage generating circuits 3 and 4).
As a result, the amount of positive and negative ions that contribute to charge removal can be controlled. Furthermore, the reactive current I ₂₊ between the electrode and the housing,
If I ₂₋ and the inter-electrode reactive current I ₃ are known, the quality of the discharge state can be monitored. This is the basic principle of the first aspect of the present invention.

By the way, in order to obtain one of the effective static elimination currents I ₁₊ or I _1- and one of the electrodes-casing reactive currents I ₂₊ or I ₂ -by using the equations (3) to (6). The ratio values K ₊ and K ₋ necessary for the above can be set to predetermined constant values in advance by causing appropriate minute fluctuations in the corresponding high voltages V ₊ and V ₋ . That is, for example, (3),
When the equation (5) is used (dV ₊ / dt >> dV ₋ / dt), a function showing a temporal minute fluctuation of the high voltage V ₊ within the minute time is, for example, V ₊ = A ₊ · exp (- t / τ) (28) Here, t is time, A is the magnitude of the high voltage V ₊ at time t = 0, and τ is an arbitrary time constant. By doing so, since dV ₊ / dt = (− 1 / τ) · V ₊ , the value K ₊ of the ratio becomes a constant (= −τ), and therefore equations (3) and (6) are , Is simplified as follows.

[0100]

[Equation 23]

Similarly, when the equations (4) and (6) are used (dV ₊ / dt << dV ₋ / dt), a function showing a temporal minute fluctuation of the high voltage V ₋ within the minute time. Where V ₋ = A ₋ · exp (−t / τ) (29), the equations (4) and (6) can be simplified as follows.

[0102]

[Equation 24]

Therefore, the high voltage V within the minute time is
_+, V _- the (28) the temporal fine fluctuations give rise to either one of, if Shiteyare exponential slight change as shown in (29), the current Ia or housing through the external grounding resistor 11 Based on only the rate of change over time of the current Ib flowing through the body-grounding resistor 12, one of the effective static elimination currents I ₁₊ or I ₁₋ and one of the electrodes / casing is calculated using the above equations (3) ′ to (6) ′ The body reactive current I ₂₊ or I ₂₋ can be easily obtained.
Since the time constant τ (= K ₊ or K ₋ ) in the expressions (3) ′ to (6) ′ is a simple constant, it is omitted, and the time change rate itself of the current Ia and the current Ib is respectively calculated. Effective static elimination current I ₁₊ or I _1- and reactive current I ₂₊ between electrode and housing
Alternatively, it may be calculated as equivalent to I ₂₋ .

The details will be described later, but the above (3)-
By obtaining the ratio values K ₊ and K ₋ in the expression (6) at any time, one of the effective static elimination currents I ₁₊ or I ₁₋ and one of the expressions (3) to (6) can be directly used. It is also possible to obtain the reactive current I ₂₊ or I ₂₋ between the electrode and the case of.

In the above description, in addition to the effective static elimination currents I ₁₊ and I ₁₋ , the reactive currents I ₂₊ and I ₂₋ between the electrode and the casing are also included.
The case where all of the inter-electrode reactive current I ₃ is obtained has been described. What is particularly important for removing the charge from the charged body is
Since the effective static elimination currents I ₁₊ and I _1- , the effective static elimination current I
It is also possible to obtain only ₁₊ and I ₁₋ . In this case, as is clear from the above, the discharge current detecting resistors 8 and 9 and the housing grounding resistor 12 are not necessary, and the resistors 8, 9 and 12 are short-circuited to Only the grounding resistor 11 may be provided. this is,
This is because the effective static elimination currents I ₁₊ and I ₁₋ can be obtained if only the current Ia flowing through the external grounding resistor 11 can be detected.

Further, for example, in addition to the effective static elimination currents I ₁₊ and I ₁₋ , only the reactive currents I ₂₊ and I ₂₋ between the electrodes and the casing may be obtained. In this case, as is clear from the above description, the discharge current detecting resistors 8 and 9 are not necessary, but these resistors 8 and 9 are short-circuited, and the external grounding resistor 11 and the chassis grounding are used. Only the resistor 12 should be provided. This is because if only the currents Ia and Ib flowing through the resistors 11 and 12 can be detected, the effective static elimination currents I ₁₊ and I _{1+ are obtained} .
_This is because it is possible to obtain ₁₋ and the reactive currents I ₂₊ and I ₂₋ between the electrodes and the housing.

In addition to the effective static elimination currents I ₁₊ and I _1- ,
Electrode / casing reactive current I ₂₊ , I ₂₋ and electrode reactive current I
Even in the case of obtaining all of ₃ , it is not necessary to provide either one of the discharge current detecting resistors 8 and 9, and a portion of either one of the discharge current detecting resistors 8 and 9 may be short-circuited.
This is because if only the currents Ia and Ib flowing through the external grounding resistance 11 and the housing grounding resistance 12 can be detected, the effective static elimination currents I ₁₊ and I ₁₋ and the reactive currents I ₂₊ and I ₂₋ between the electrodes and the housing are detected. If the total discharge currents I _{S +} and I _S− of either one of the discharge electrodes 1 and 2 are detected, the above (26),
Using either one of the equations (27), the reactive current between electrodes I ₃
Because you can ask.

Further, in addition to the effective static elimination currents I ₁₊ and I _1- , the total reactive current (= I ₂₊ + I) in each discharge electrode 1, 2.
₃ and I ₂₋ + I ₃ ) may be obtained. In this case, the housing grounding resistor 12 is not necessary, and it suffices to short the part of the resistor 12 and provide only the external grounding resistor 11 and both discharge current detecting resistors 8 and 9. This is to subtract the effective static elimination currents I ₁₊ and I ₁₋ obtained from the current Ia flowing through the external grounding resistor 12 from the total discharge currents I _{S +} and I _S− flowing through the discharge current detecting resistors 8 and 9. Then, the total reactive current (= I ₂₊ + I ₃ and I _{2 −} + I in each discharge electrode 1, ₂ )
₃ ) You can ask.

Next, the basic principle of the second aspect of the present invention will be described with reference to FIG.

In this figure, this static eliminator comprises discharge electrodes 1 and 2 having the same structure as the static eliminator of FIG. 1, high voltage generating circuits 3 and 4, transformers 5 and 6, discharge electrodes 1 and 2, and a high voltage. It is provided with a case 7 made of a conductive material that houses the voltage generation circuits 3 and 4 and the transformer 5. In this static eliminator, a pair of external grounding resistors 13 connected in series,
The grounding end of the secondary coil of the positive side transformer 5 is connected to the resistor 13 side of these resistors 13 and 14, and the grounding of the secondary side coil of the negative side transformer 6 is connected to the resistor 14 side. The ends are connected. And the external grounding resistor 1
The middle points of 3 and 14 are short-circuited to the external ground portion 10.

A pair of case grounding resistors 15 and 16 connected in series are connected in parallel to the external grounding resistors 13 and 14, and the middle point of these case grounding resistors 15 and 16 is made of a conductive material. It is short-circuited to the housing 7 made of. Therefore,
The housing 7 is connected to the grounding ends of the secondary side coils of the transformers 5 and 6 via separate resistors 15 and 16, respectively.

In the static eliminator having such a configuration, as is apparent with reference to the figure, the positive side effective static erasing current I ₁₊ and the negative side effective static erasing current are provided at the midpoints of the external grounding resistors 13 and 14. I
₁ of the difference between the current Ia (= I ₁₊ -I _1-) is external ground 10
Flowing from. In addition, at the midpoint of the resistors 15 and 16 for grounding the casing, a current Ib (= I _{2+) which is} a difference between the reactive current I ₂₊ between the positive electrode and the casing and the reactive current I ₂₋ between the negative electrode and the casing is provided. -I _2- ) flows from the housing 7. The interelectrode reactive current I ₃ flows through both the external grounding resistors 13 and 14 and the chassis grounding resistors 15 and 16.

Here, as shown in the figure, assuming that the currents flowing through the external grounding resistors 13 and 14 and the chassis grounding resistors 15 and 16 are Ic, Id, Ie, and If respectively, according to Kirchhoff's law. , Ia = Ic-Id (30) Ib = Ie-If (31) Therefore, by detecting the difference between the voltages generated in the external grounding resistors 13 and 14, the current I
The current Ib is detected according to the equation (31) by detecting a and detecting the difference between the voltages generated in the housing grounding resistors 15 and 16.

If the currents Ia and Ib are detected in this manner, the effective static elimination currents I ₁₊ , I _1- , the electrodes, and the electrodes are removed by the same method as that described for the static eliminator of FIG. Inter-casing reactive currents I ₂₊ , I _2- and inter _- electrode reactive current I
You can ask for ₃ . In this case, the total discharge current I _{S +} or I _S− of either one of the discharge electrodes 1 and 2 required to obtain the inter-electrode reactive current I ₃ is the above currents Ic to Ic.
Since d is expressed as I _{S +} = Ic + Ie (32) I _S- = Id + If (33), the total voltage is generated, for example, by the sum of the voltages generated in the external grounding resistor 13 and the chassis grounding resistor 15. The discharge current I _{S +} is detected, and the total discharge current I _S− is detected by the sum of the voltages generated in the external grounding resistor 14 and the chassis grounding resistor 16. Alternatively, as in the case of the static eliminator of FIG. 1, the discharge current detecting resistors are connected in series to the secondary side coils of the transformers 5 and 6, and the total discharge current I is generated by the voltages generated in the discharge current detecting resistors. It is also possible to detect _{S +} and _IS- .

Therefore, also in the static eliminator of FIG. 2, it is possible to control the generation amount of positive and negative ions contributing to static elimination and monitor the quality of the discharge state. This is the basic principle of the second aspect of the present invention.

In the above description, the effective static elimination current
I₁₊, I_1-In addition to the reactive current I between the electrode and the housing₂₊, I_2-
And reactive current between electrodes I₃The case of seeking all of
As mentioned above, as in the case of the static eliminator of FIG.
Current I₁₊, I_1-You may ask only for. this
In some cases, both of the chassis grounding resistors 15 and 16 or
Either one of them is not necessary. For example, the case grounding resistor 15,
Either one of 16 parts is short-circuited, or
Both the ground resistors 15 and 16 are deleted, and the external ground resistor
Either one of the housings 13 and 14 has the resistance side
Connect to the ground end of the secondary coil of one transformer 5 or 6
do it. Even in this way, according to the above equation (30),
Therefore, the current Ia can be detected.
Current I ₁₊, I_1-Can be asked.

Further, for example, in addition to the effective static elimination currents I ₁₊ and I ₁₋ , only the reactive currents I ₂₊ and I ₂₋ between the electrodes and the casing may be obtained. In this case, the external grounding resistor 13,
Both 14 and the housing grounding resistors 15 and 16 are required.

Furthermore, in addition to the effective static elimination currents I ₁₊ and I _1- , the total reactive current (= I ₂₊ + I) in each discharge electrode 1, 2.
₃ and I ₂₋ + I ₃ ) may be obtained. In this case, neither or both of the housing grounding resistors 15 and 16 are necessary, and for example, the housing grounding resistors 15 and 16 are not necessary.
Either one of the parts of 16 is short-circuited, or both of the housing grounding resistors 15 and 16 are deleted, and one of the housings 7 is connected to one of the external grounding resistors 13 and 14. It may be connected to the ground end of the secondary coil of the transformer 5 or 6. However, when either one of the casing grounding resistors 15 and 16 is short-circuited, the discharge current detection resistor or the like is used for the discharge electrode 1 or 2 on the short-circuited side, and the total discharge current I _{S +} is used. Or it is necessary to detect I _S- . Further, when both the casing grounding resistors 15 and 16 are removed, the discharge electrode 1 on the transformer 5 or 6 side connected to the casing 7
For or 2, it is necessary to detect the total discharge current I _{S +} or I _S- using a discharge current detection resistor or the like. The other total discharge current I _{S +} or I _S- is detected by the voltage of the external grounding resistor 13 or 14 on the corresponding side.

Next, the basic principle of the third aspect of the present invention will be described with reference to FIG.

In FIG. 3, this static eliminator comprises discharge electrodes 1 and 2 having the same structure as the static eliminator of FIG. 1, high voltage generation circuits 3 and 4, transformers 5 and 6, discharge electrodes 1 and 2, and a high voltage. It is provided with a housing 7 that houses the voltage generation circuits 3 and 4 and the transformer 5. In this case, the housing 7 is made of an insulating material such as plastic. The static eliminator is provided with the external grounding resistor 11 and the discharge current detecting resistors 8 and 9 with the same connection configuration as the static eliminator of FIG.

In the static eliminator having such a structure, the housing 7
Since it is made of an insulating material, reactive current flows between the electrode and the housing.
The total discharge current I of each discharge electrode 1, 2._{S +}, I_S-Is each
Effective static elimination current I₁₊, I_1-And reactive current between electrodes I₃Combined with
Will be things. Excluding this point, the static eliminator of FIG.
In the same manner as in the case, each effective static elimination current I₁₊, I _1-
And reactive current between electrodes I₃Is required.

That is, the voltage generated in the external grounding resistor 11 is
Both effective static elimination currents I by pressure₁₊, I _1-Difference current Ia
Is detected, which is completely different from the case of the static eliminator of FIG.
With the same method, each effective static elimination current I₁₊, I_1-Wanted
To be In addition, either one of the discharge current detection resistors 8 or
Is one of the discharge electrodes 1 or 2 detected by the voltage generated at 9.
Is the total discharge current I of 2_{S +}Or I_S-From the corresponding valid
Static elimination current I₁₊Or I_1-By subtracting
Flow I₃Is required. This subtraction operation is the same as (26) or
In the equation (27) is I₂₊= I_2-= 0
It

Therefore, also in the static eliminator of FIG. 3, it is possible to control the amount of positive and negative ions that contribute to static elimination and monitor the quality of the discharge state. This is the basic principle of the third aspect of the present invention.

As is clear from the description of the static eliminator of FIG. 1, the discharge current detecting resistors 8 and 9 are not necessary when only the effective static neutralization currents I ₁₊ and I _1- are obtained. . Further, even when the reactive current I ₃ between electrodes is obtained, it is sufficient to provide only one of the discharge current detecting resistors 8 and 9.

Next, the basic principle of the fourth aspect of the present invention will be described with reference to FIG.

In FIG. 4, this static eliminator comprises discharge electrodes 1 and 2 having the same structure as the static eliminator of FIG. 2, high voltage generation circuits 3 and 4, transformers 5 and 6, discharge electrodes 1 and 2, and a high voltage. It is provided with a housing 7 that houses the voltage generation circuits 3 and 4 and the transformer 5. In this case, the housing 7 is made of an insulating material such as plastic, like the static eliminator of FIG. The static eliminator is provided with a pair of external grounding resistors 13 and 14 with the same connection configuration as the static eliminator of FIG.

In the static eliminator having such a structure, the reactive current between the electrode and the housing does not flow like the static eliminator of FIG. 3. Except this point, the static eliminator of the static eliminator of FIG. , The effective static elimination currents I ₁₊ , I ₁₋ and the interelectrode reactive current I ₃ are obtained.

That is, the external grounding resistors 13 and 14 have
Due to the generated voltage difference, both effective static elimination currents I₁₊, I_1-Difference
Minute current Ia is detected, which results in
Each effective static elimination is performed by the same method as in the static elimination device.
Current I₁₊, I_1-Is required. Also, obviously I_{S +}= I
c, I_S-= Id, so either one is for external grounding
One of the discharge electrodes 1 depends on the voltage generated in the resistor 13 or 14.
Or the total discharge current I of 2 _{S +}Or I_S-Detected, the full discharge
Current I_{S +}Or I_S-To the effective static elimination current I corresponding to₁₊
Or I_1-By subtracting₃Wanted
To be

Therefore, also in the static eliminator of FIG. 4, it is possible to control the amount of positive and negative ions that contribute to static elimination and monitor the quality of the discharge state. This is the basic principle of the fourth aspect of the present invention.

Based on the basic principles of the first to fourth aspects of the present invention described above, a more specific embodiment of the first aspect of the present invention will now be described with reference to FIGS. 1, 5 and 6. It will be described with reference to FIG. FIG. 5 is a circuit configuration diagram of the static eliminator of the present embodiment, and FIG. 6 is a diagram for explaining the operation of the static eliminator of the present embodiment.

With reference to FIG. 5, the static eliminator of this embodiment is
The static eliminator shown in FIG. 1 has the same basic configuration as that of the positive and negative discharge electrodes 1 and 2, the positive and negative high voltage generating circuits 3 and 4, and the positive and negative transformers 5 and 6. 1, a casing 7 made of a conductive material, discharge current detection resistors 8 and 9, an external grounding resistor 11, and a casing grounding resistor 12 are provided. It is the same as the device.
The grounding portions of the high voltage generating circuits 3 and 4 are connected to the grounding ends of the secondary side coils of the transformers 5 and 6 corresponding thereto. Further, each of the high voltage generation circuits 3 and 4 gives a high voltage instruction value signal (voltage signal), which will be described later, to the positive and negative high voltages V ₊ , V proportional to the level of the high voltage instruction value signal. _- a is for generating and applying to each of the discharge electrodes 1 and 2 through the transformers 5 and 6.

The static eliminator of this embodiment is for external grounding.
Both effective static elimination currents I depending on the voltage of the resistor 11₁₊, I_1-of
Active current difference detection means 17 for detecting the difference current Ia
And the derivative for obtaining the temporal change rate dIa / dt of the current Ia
Device (first differentiating means) 18 and the housing grounding resistor 12
The reactive current I between the both electrodes and the housing due to the pressure₂₊, I_2-Difference of
Electrode / casing reactive current difference detector for detecting the current Ib
The step 19 and the time change rate dIb / dt of the current Ib are obtained.
Differentiator (second differentiating means) 20, and (1),
The high voltage generation circuits 3 and 4 are set so that the condition (2) is satisfied.
Generation of positive and negative ions that contribute to static elimination while controlling each
Positive side and negative side high voltage control means 21 and 22 for controlling
Each effective static elimination current I for each high voltage control means 21, 22
₁₊, I_1-Positive side and negative side which are setting means for giving the set value of
The setters 23 and 24 and each effective static elimination current I ₁₊, I_1-The it
First and second effective static elimination current detecting means 25, which are obtained respectively
26 and reactive current I between each electrode and the case₂₊, I_2-Each
First and second electrode-casing reactive current detection means 2 to be obtained
7, 28 and the voltage of each discharge current detection resistor 8, 9
Total discharge current I of each discharge electrode 1 and 2_{S +}, I_S-Inspect each
Positive side and negative side discharge current detecting means 29 and 30 to be output, and
Reactive current between electrodes I₃Means for detecting reactive current between electrodes
31 and each effective static elimination current I₁₊, I_1-Between each electrode and housing
Effective current I₂₊, I_2-And reactive current between electrodes I₃Each place
An alarm means 32 for issuing an alarm when a predetermined set value is exceeded,
33, 34, 35, 36.

In the present embodiment, the high voltage control means 21 and 22 are dV ₊ / d under the condition (1).
The high voltage generation circuits 3 and 4 are controlled so that t >> dV ₋ / dt. Further, all the circuits to be described later, which compose the respective means 17 to 36, are grounded to the housing 7. Figure 5
In FIG. 5, the grounding to the housing 7 is indicated by using a square symbol with diagonal lines.

The active current difference detecting means 17 is composed of a pair of filters 37, 37 respectively connected to both ends of the external grounding resistor 11 and a differential amplifier 38 having the outputs of these filters 37, 37 as inputs. It is configured. The potential signal generated at both ends of the external grounding resistor 11 by the current Ia is input to the differential amplifier 38 after the noise components are removed by the filters 37, 37, and the differential amplifier 38 is supplied.
Amplify the level difference between the potential signals, that is, the voltage generated in the external grounding resistor 11 with a predetermined gain and output the amplified voltage. As a result, the voltage signal Va having a level proportional to the current Ia which is the difference between the effective static elimination currents I ₁₊ and I ₁₋ is obtained from the differential amplifier 38, and the current Ia is detected.

Similarly, each discharge current detecting means 2
Reference numerals 9 and 30 denote filter pairs 39 and 40 respectively connected to both ends of the discharge current detecting resistors 8 and 9, and differential amplifiers 41 and 42 having outputs of the filters 39 and 40 of each pair as inputs.
And a voltage signal V of a level proportional to the total discharge currents I _{S +} and I _S- from the differential amplifiers 41 and 42, respectively.
_{S +} and V _S- are obtained.

The electrode / chassis reactive current difference detection means 19 includes a single filter 43 connected to one end of the casing grounding resistor 12 connected to the casing 7 and the other end opposite thereto.
An amplifier 44 which receives the output of the filter 43 as an input, and obtains from the amplifier 44 a voltage signal Vb having a level proportional to the current Ib which is the difference between the reactive currents I ₂₊ and I ₂₋ between the electrodes and the housing. I am trying. In this case, the housing grounding resistor 12, the filter 43, and the amplifier 44 are grounded to the housing 7. Therefore, as described above, the single filter 43 and the normal amplifier 44 are used to connect between the electrodes and the housing. The reactive current difference detection means 19 is configured.

The filters 37, 39, 40 and 4 are used.
As shown in FIG. 5, 3 has the same structure including a resistor and a capacitor.

The negative side high voltage control means 22 is a comparator (comparing means) 45 for comparing the detected value of the negative side effective static elimination current I ₁₋ given thereto and the set value thereof, as will be described later, and the comparator 45.
From the output of the negative side high voltage generation circuit 4 to generate a negative side high voltage instruction value signal (voltage signal) V _C1− indicating the high voltage instruction value.

The comparator 45 outputs a voltage signal of high and low binary levels according to the magnitude relationship between the detected value of the negative side effective static elimination current I ₁₊ and its set value. More specifically, the negative side When the detected value of the effective static elimination current I _1- is smaller than the set value, a high-level voltage signal is output, and in the opposite case,
It outputs a low level voltage signal.

The negative side instruction value generating means 46 is composed of a time constant circuit consisting of a resistor 48 and a capacitor 49 connected to the output side of the comparator 45, and the voltage of the capacitor 49 is set to the negative side high voltage instruction value signal V _{C1. -Generate} as. In such a configuration, the level of the negative-side high-voltage instruction value signal V _C1- increases when the detected value of the negative-side effective static elimination current I _1- becomes smaller than the set value, and conversely, the negative-side effective static elimination current I _1- It decreases when the detected value of ₋ becomes larger than the set value, and basically, the resistance value of the resistor 48 and the capacitor 49 are set so that the detected value of the negative side effective static elimination current I ₁₋ converges to a level that matches the set value. Increase or decrease with a time constant determined by the capacity of. Here, the time constant is relatively large (for example, about 1 second in this embodiment).
Is set, and within a time period sufficiently shorter than the time constant, the level of the negative side high voltage instruction value signal V _C1− is maintained substantially constant, and the above-mentioned increase / decrease is performed relatively gently.

In the present embodiment, it is generated as described above.
Negative side high voltage indication value signal V_{C1 +}Level is negative high voltage
High voltage V applied to the negative discharge electrode 2 by the generation circuit 4_-Large
The negative side high voltage finger is basically specified.
Indication signal V_C1-To the negative side high voltage generation circuit 4
Then, the high voltage generation circuit 4 operates the negative high voltage indication value signal V
_C1-Negative voltage V of a magnitude proportional to the level of_-Discharge
It is applied to the electrode 2. However, in this embodiment,
When composed of comparator 45, resistor 48 and capacitor 49
While the ground level of the constant circuit is the potential of the case 7,
Ground level of negative side high voltage generation circuit 4 (= negative side transformer 6
The level of the grounding end of the secondary coil of the
No, the negative side high voltage only by the potential difference of their ground level
Indicator value signal V_C1-Of the negative side high voltage generation
It is necessary to add it to the road 4.

Therefore, in the present embodiment, the negative side high voltage control means 22 is provided with the adder 50 for performing the above correction. The adder 50 is connected to the negative side high voltage instruction value signal V _C1− and the ground side of the high voltage generation circuit 4 of the pair of filters 40, 40 of the negative side discharge current detection means 30. The output signal of the filter 40 is input, and a signal obtained by adding the level of the high voltage instruction value signal V _{C1- and} the level of the output signal of the filter 40 is the final negative high voltage instruction value signal V _{C2. It} is given to the high voltage generation circuit 4 as-. In this case, the level of the output signal of the filter 40 indicates the potential level of the ground portion of the high voltage generation circuit 4 with respect to the potential level of the housing 7, and the negative side high voltage instruction value obtained by the above addition. By _{applying the} signal V _C2- to the high voltage generation circuit 4, the high voltage generation circuit 4
_Applies a negative high voltage V ₋ having a magnitude proportional to the level of the negative side high voltage instruction value signal V _{C1 −} generated by the negative side instruction value generating means 46 to the discharge electrode 2.

As a result, the negative voltage applied to the discharge electrode 2
High voltage V_-Is the negative side effective static elimination current I _1-Is the set value
Controlled to match. And at this time,
Compare the time constant of the circuit consisting of the resistor 48 and the capacitor 49.
All of them are almost constant within a sufficiently short time.
ΔV under the condition (2)_-≪V_-The relationship of
It will be.

The positive-side high-voltage control means 21 is a comparator (comparing means) 51 for comparing the detected value of the positive-side effective static elimination current I ₁₊ given as described later and its set value, and the comparator 51.
From the output of the positive side high voltage generation circuit 3 to a positive side high voltage instruction value signal (voltage signal) V _{C1 +} indicating the high voltage instruction value, and a positive side high voltage instruction value signal. An instruction value processing means 53 that repeatedly generates minute exponential fluctuations for a minute time, and an adder 54 that corrects the level of the instruction value signal V _{C2 +} that causes minute fluctuations in the positive-side high-voltage instruction value signal V _{C1 +.} Is equipped with.

The positive side instruction value generating means 52 is composed of a time constant circuit composed of a resistor 55 and a capacitor 56, similarly to the negative side instruction value generating means 46, and by the comparator 51 as in the case of the negative side. , Positive side high voltage indication value signal V _{C1 +}
Generate That is, the positive side high voltage instruction value signal V _{C1 +} generated by the positive side instruction value generating means 52 is a resistor so that the detected value of the positive side effective static elimination current I ₁₊ converges to a level that matches the set value. It increases or decreases with a time constant determined by the resistance value of 55 and the capacity of the capacitor 56. Here, the time constant is the same as the time constant of the negative side instruction value generating means 46 (1
Within a time period sufficiently shorter than the time constant, the level of the positive side high voltage instruction value signal V _{C1 +} is maintained substantially constant, and the above-mentioned increase / decrease is performed relatively gently.

In the present embodiment, the level of the positive side high voltage indicating value signal V _{C1 +} is basically the magnitude of the high voltage V ₊ applied to the positive side discharge electrode 1 by the positive side high voltage generating circuit 3. Is defined.

The indicated value processing means 53 determines the positive side total discharge current I.
_A comparator with hysteresis 57 for comparing the level of the voltage signal V _{S +} of the differential amplifier 41 indicating the _{S + with} the level of the positive side high voltage instruction value signal V _{C1 +} , and the output side of the comparator 57 are connected. A time constant circuit including a resistor 58 and a capacitor 59. In this case, the comparator with hysteresis 57 basically outputs a high level signal when the level of the voltage signal V _{S +} is lower than the level of the positive side high voltage instruction value signal V _{C1 +} , and the positive side high voltage instruction value. Signal V
_When it reaches the level of _{C1 +} or higher, it outputs a low level signal. However, once the low level signal is output, the level of the voltage signal V _{S +} is higher than the positive side high voltage instruction value signal V _{C1 +} by a predetermined hysteresis width. The output of the low level signal is continued until it becomes smaller. The time constant of the circuit including the resistor 58 and the capacitor 59 is sufficiently smaller than the time constant of the positive side instruction value generating means 52 (for example, 0.1 second in this embodiment).

The instruction value processing means 53 has the above-described configuration so that the voltage of the capacitor 56 changes the voltage of the capacitor 56 to the positive high voltage instruction value by causing the positive high voltage instruction value signal V _{C1 +} to undergo exponentially minute fluctuations. Generate as signal V _{C2 +} .

Like the negative-side adder 50, the adder 54 corresponds to the positive-side high-voltage generation circuit 3 with the level of the positive-side high-voltage instruction value signal V _{C2 +} obtained by the instruction-value processing means 53. The level of the output signal of the filter 39 connected to the ground side of the high voltage generation circuit 3 of the pair of filters 39, 39 of the positive side discharge current detection means 29 is corrected to the positive side high voltage. It is added to the level of the instruction value signal V _{C2 +} , and the signal obtained by the addition is given to the high voltage generation circuit 3 as the final positive side high voltage instruction value signal V _{C3 +} .
As a result, the high voltage generation circuit 3 causes the indicated value processing means 53 to operate.
The positive high voltage V ₊ having a magnitude proportional to the level of the positive side high voltage indicating value signal V _{C2 +} obtained by the above is applied to the discharge electrode 1.

In the configuration of the positive side high voltage control means 21 as described above, the instruction value processing means 53 uses the positive side high voltage instruction value signal V _{C1 +} generated by the positive side instruction value generating means 52 as an index as follows. It produces functional small fluctuations.

That is, within a short time in which the positive side high voltage indicating value signal V _{C1 +} can be regarded as substantially constant, the voltage signal V _{S +} input to the comparator with hysteresis 57 (this corresponds to the positive side total discharge current I _{S +)} . Is proportional to the high voltage V ₊ ,
Therefore, the level of the voltage signal V _{S +} is determined by the indicated value processing means 5
3 corresponds to the level of the positive side high voltage instruction value signal V _{C2 +} . In the indicated value processing means 53 composed of the comparator 57 and the time constant circuit including the resistor 58 and the capacitor 59, the capacitor 5
The voltage of 9 is basically controlled to a level such that the level of the voltage signal V _{S +} matches the level of the positive side high voltage instruction value signal V _{C1 +} generated by the positive side instruction value generating means 52. However, at this time, the comparator 57 has the hysteresis characteristic as described above, and the resistor 58 is provided.
Since the time constant of the circuit composed of the capacitor 59 and the capacitor 59 is small, as shown in FIG. 6, the capacitor 59 is intermittently charged every minute time even during the time when the level of the positive side high voltage instruction value signal V _{C1 +} can be regarded as substantially constant. The discharge is repeated. Then, at this time, since the capacitor 59 is charged and discharged exponentially, the voltage of the capacitor 59 is exponentially added to the positive side high voltage instruction value signal V _{C1 +} generated by the positive side instruction value generating means 52. The signal becomes a signal having a large variation, and by making the hysteresis width of the comparator 57 relatively small, the variation becomes minute.

As a result, the voltage of the capacitor 59 is positive.
Positive side high voltage instruction generated by the side instruction value generating means 52
Value signal V_{C1 +}The exponential small fluctuation is repeated every minute
Positive side high voltage indication value signal V that is generated by returning_{C2 +}age
Generated by the positive high voltage V proportional to the level₊Let go
It is applied to the electrode 1. And at this time, the positive side indicated value
Positive side high voltage instruction value signal V generated by the generation means 52_{C1 +}Is
The negative side high voltage instruction value signal V_C1-The change is similar to
Since it is soft, ΔV under the condition (2) above
₊≪V₊And the relationship of dV under the above condition (1)
₊/ Dt >> dV _-The relationship of / dt should be satisfied.
It

The differentiators 18 and 20 differentiate the voltage signal Va of the differential amplifier 38 and the voltage signal Vb of the amplifier 44 indicating the currents Ia and Ib, respectively, and output the differentiated voltage signals Va and Ib. Temporal change rate dIa / dt, d
A voltage signal of a level corresponding to Ib / dt is output. In this case, each of the differentiators 18, 20 has an integrator,
Fine pulse-shaped signals included in the voltage signals Va and Vb are removed. Also, each differentiator 18, 2
The output of 0 has its positive and negative polarities inverted with respect to the actual differential value.

The first effective static elimination current detecting means 25 is
Positive peak hold device 60 for inputting the output of the differentiator 18
The maximum value of the temporal change rate dIa / dt of the current Ia within a minute time in which the level of the positive side high voltage instruction value signal V _{C2 +} generated by the instruction value processing means 53 exponentially decreases. Voltage signal V of a level corresponding to
₁₊ is output to the comparator 51. Here, as described above with reference to FIG. 6, within the time period during which the level of the positive-side high-voltage command value signal V _{C2 +} exponentially decreases, the positive high-voltage V ₊ is expressed by the equation (28). The temporal change rate dIa / dt within that time indicates the magnitude of the positive-side effective static elimination current I ₁₊ , as expressed in the equation (3) ′. Then, as described above, the positive side high voltage instruction value signal V
_The time at which the level of _{C2 +} exponentially decreases is sufficiently short, so that the rate of temporal change dIa /
It may be considered that dt is substantially constant. Therefore, the voltage signal V ₁₊ output from the positive peak hold device 60 shows the detected value of the positive side effective static elimination current I ₁₊ , and the positive side effective static elimination current I ₁₊ is detected by this. To be done.

Similarly, the first electrode-chassis reactive current detection means 27 is composed of a positive peak hold device 61 which receives the output of the differentiator 20 as input, and the peak hold device 61 outputs the positive peak hold device 61. According to the equation (5) ', the positive electrode
Voltage signal V ₂₊ indicating the detected value of the inter-chassis reactive current I ₂₊ is output.

The second effective static elimination current detecting means 26 is
Subtraction for subtracting the level of the voltage signal V ₁₊ (detection value of the positive side effective static elimination current I ₁₊ ) obtained by the peak hold unit 60 from the level of the voltage signal Va obtained by the differential amplifier 38 (current Ia) The container 62 is provided. In this case, since the voltage signal Va of the differential amplifier 38 is accompanied by a minute fluctuation, the filter 6 including a resistor and a capacitor is used.
The average level of the voltage signal Va is given to the subtractor 62 via 3. Then, the subtractor 62 outputs the voltage signal V ₁₋ at the level indicating the magnitude of the negative side effective static elimination current I _{1− to} the comparator 45 by performing the subtraction operation according to the equation (22). .

Similarly, the second electrode-casing reactive current detecting means 28 is provided with a subtracter 64, and the subtracter 6
4 is the level of the voltage signal V ₂₊ input from the peak hold device 61 from the level (current Ib) of the voltage signal Vb input from the amplifier 44 through the filter 65 (invalid between the positive electrode and the housing). The detected value of the current I ₂₊ ) is the above (2
Subtraction is performed according to the equation (3), and as a result, a voltage signal V ₂₋ having a level indicating the magnitude of the reactive current I ₂₋ between the negative electrode and the housing is output.

The inter-electrode reactive current detecting means 31 determines the peak hold unit 60, from the level (total discharge current I _{S +} ) of the voltage signal V _{S +} obtained by the differential amplifier 41.
A subtracter 66 for subtracting the levels of the voltage signals V ₁₊ and V ₂₊ respectively obtained by 61 (the positive side effective static elimination current I ₁₊ and the detection value of the positive side electrode-chassis reactive current I ₂₊ ) ing.
In this case, since the voltage signal V _{S +} of the differential amplifier 41 is accompanied by a minute fluctuation, the average level of the voltage signal V _{S +} is subtracted by the subtractor 6 via the filter 67 including a resistor and a capacitor.
6 given. Then, the subtractor 66 uses the above (26)
By performing the subtraction operation according to the formula, the inter-electrode reactive current I ₃
The voltage signal V _{3 of the} level indicating the magnitude of the signal is output. still,
In this way, the subtraction operation for obtaining the inter-electrode reactive current I ₃ is obtained by the subtracters 62 and 64 from the level (total discharge current I _S− ) of the voltage signal V _S− obtained by the differential amplifier 42, respectively. By subtracting the levels of the voltage signals V ₁₋ and V ₂₋ (the detected values of the negative side effective static elimination current I ₁₋ and the negative side electrode-chassis reactive current I ₂₋ ) according to the equation (27). You may do it.

In the positive side setting device 23, the comparator 51 is
Voltage signal V of peak hold device 60 ₁₊Level (with positive side)
Effective static elimination current I₁₊Set value V to be compared with_{1S +}To
Positive side effective static elimination current I₁₊Is generated as the setting value of
Performs volume adjustment operation using a variable resistor (not shown)
The desired set voltage V_{1S +}Configured to be configurable
ing.

The negative side setting device 24 is a negative side effective static elimination current.
I_1-Set the value of the positive side effective static elimination current I ₁₊Suitable for
What is set in the comparator 45 according to the ratio (ratio)
Then, the negative side effective static elimination current I_1-The subtractor 6 indicating the detected value of
2 voltage signal V_1-Is reduced by the variable resistor 68 and the comparator
45 and the positive side effective static elimination current I₁₊Detection value of
Showing the voltage signal V of the peak hold device 60₁₊As is
The input is made to the comparator 45. This allows
In the comparator 45, the negative side effective static elimination current I_1-Is set to the positive side
Effective static elimination current I₁₊With respect to the resistance value of the variable resistor 68
It is set by a fixed ratio, and at that time, the ratio is acceptable
Arbitrarily set by adjusting the resistance value of variable resistor 68
It is possible.

The alarm means 32 uses the level of the positive side high voltage instruction value signal V _{C3 +} given from the adder 54 to the positive side high voltage generation circuit 3 as a maximum voltage level preset as its allowable maximum level. a comparator 69 for comparing the V + _MAX, when V _{C3 +} level becomes the maximum voltage level V _{+ MAX} above, is constituted by the alarm device 70 for issuing an alarm in response to the output of the comparator 69.

Similarly, the alarm means 33 includes a comparator 71.
And the alarm device 72, and the negative side high voltage generation circuit 4
Negative side high voltage instruction value signal given from the adder 50 to
V_{C2 -}The level of
Set maximum voltage level V _-MAXWhen the above is reached, the ratio
A structure for issuing an alarm from the alarm device 72 according to the output of the comparator 71
It is said to be successful.

[0163] The warning means 34, the indicating the level of the voltage signal V ₂₊ of the peak hold circuit 61 indicating the reactive current I ₂₊ between positive electrode and the casing, a positive total discharge current I _{S +} A comparator 73 for comparing the voltage signal V _{S +} of the differential amplifier 41 with a voltage level obtained by stepping it down at a predetermined ratio, and V ₂₊
When the level (reactive current I ₂₊ between the positive electrode and the case) exceeds a predetermined ratio with respect to the level (total discharge current I _{S +} ) of the voltage signal V _{S +} , according to the output of the comparator 73. And an alarm device 74 for issuing an alarm.

Similarly, the alarm means 35 includes a comparator 75.
And a warning device 76, the level of the voltage signal V ₂₋ of the subtractor 64 (negative side electrode / casing reactive current I ₂₋ ) is the level of the voltage signal V _S− of the differential amplifier 42 (total Discharge current I
_S- ) is equal to or higher than a predetermined ratio, an alarm is issued from an alarm device 76 according to the output of the comparator 75.

Further, the alarm means 36 is arranged so that the voltage signal V ₃ of the subtracter 66 indicating the inter-electrode reactive current I ₃ and the differential amplifier 41 indicating the positive side and negative side total discharge currents I _{S +} and I _S-. ，
42 and a pair of comparators 77 and 78 for respectively comparing the voltage signals V _{S +} and V _S− of 42 with a voltage level obtained by stepping them down at a predetermined ratio, respectively, and a level of V ₃ (interelectrode reactive current I
₃ ) becomes a predetermined ratio or more with respect to the level of V _{S +} or V _S- (total discharge current I _{S +} or I _S- ), respectively,
It is configured by an alarm device 79 which issues an alarm according to the output of the comparator 77 or 78.

The alarm device 7 of each of the above-mentioned alarm means 32 to 36.
0, 72, 74, 76, 79 are configured by using an unillustrated indicator, lamp, buzzer, or the like.

The voltage signal V _{S +} is applied to the alarm means 34 and 36 from the differential amplifier 41 via the filter 67. Similarly, the alarm means 35 and 36 are
The voltage signal V _S− is supplied from the differential amplifier 42 through a filter (not shown) having the same structure as the filter 67.

Next, the overall operation of the static eliminator of this embodiment will be described.

In the static eliminator of this embodiment, first, by operating the positive side setter 23, the positive side effective static erasing current I ₁₊
The set voltage V _{1S +} indicating the set value of is set in the comparator 51, and by adjusting the resistance value of the variable resistor 68 of the negative side setter 24, the set value of the negative side effective static elimination current I ₁₋ becomes positive. It is set in the comparator 45 at a ratio determined by the resistance value of the variable resistor 68 with respect to the side effective static elimination current I ₁₊ . At this time,
When adjusting the resistance value of the variable resistor 68, the static eliminator of this embodiment is actually operated while the positive side effective static erasing current I ₁₊ is set, and both positive and negative ion generation amounts are discharged. Confirmation is made in front of the electrodes 1 and 2 using a charging plate monitor (not shown), and the resistance value of the variable resistor 68 is adjusted so that the positive and negative ion generation amounts are balanced.

When the static eliminator is started with the above settings, the positive side instruction value generating means 52 causes the comparator 51 to operate.
Generates a positive-side high-voltage instruction value signal V _{C1 +} according to the output of At this time, in the initial stage, the comparator 51 outputs a high level signal, and therefore the positive high voltage indication value signal V _{C1 +} is a time constant (determined by the resistance value of the resistor 55 and the capacitance of the capacitor 56 ( It will increase relatively slowly in about 1 second). Then, the positive side high voltage instruction value signal V
As described above, _{C1 +} is processed into the positive-side high-voltage command value signal V _{C2 +} (see FIG. 6) by causing the signal V _{C1 +} to undergo exponential minute fluctuations by the command value processing means 53, and further the signal is processed. V _{C2 +} is applied to the high voltage generation circuit 3 after its level is corrected by the adder 54 to a level suitable for the positive side high voltage generation circuit 3. As a result, a positive high voltage V ₊ proportional to the level of the positive high voltage instruction value signal V _{C2 +} is applied to the positive discharge electrode 1 from the high voltage generation circuit 3 to start discharging.

[0171] Further, in the negative side, the negative side by an instruction value generating means 46, the negative high voltage instruction value signal V _C1 which increases gradually in the same manner as the initial stage the ₊ positive high voltage instruction value signal V _{C1 -} Is generated, the level of this signal V _C1- is corrected by the adder 50 to a level suitable for the negative side high voltage generation circuit 4, and then applied to the high voltage generation circuit 4.
As a result, a negative high voltage V _{− that} is proportional to the level of the positive high voltage instruction value signal V _{C1 −} is applied to the negative discharge electrode 2 from the high voltage generation circuit 4, and discharge is started.

When such a discharge is started, the effective discharge currents I ₁₊ and I _1- , the reactive currents I ₂₊ and I _2- between the electrodes and the case, and the electrodes between the electrodes are discharged to the discharge electrodes 1 and _2. The total discharge currents I _{S +} and I _{S-, which} are the combined reactive current I ₃ , flow.

At this time, the current Ia, which is the difference between the two effective static elimination currents I ₁₊ and I _1- , flows through the external grounding resistor 11, and this is detected by the active current detection difference detection means 17 and corresponds to the detected value. The voltage signal Va of the level to be output is output from the differential amplifier 38 to the differentiator 18. Then, the differentiator 18 obtains the temporal change rate dIa / dt of the current Ia by differentiating the voltage signal Va and outputs it to the peak hold unit 60.

In this case, since the high voltage V ₊ applied to the discharge electrode 1 has undergone an exponential minute fluctuation,
The current Ia (voltage signal Va) also has minute fluctuations that follow the minute fluctuations. Since the differentiator 18 as described above is intended to invert the polarity of the differential value voltage signal Va, the peak hold circuit 60 is minute period T of the high voltage V ₊ is small decreases exponentially (Fig. 6 The voltage signal V ₁₊ having a level corresponding to the temporal change rate dIa / dt of the current Ia in the reference signal is output. Further, during the period T, the high voltage V ₊ is represented by the form shown in the equation (28). Therefore, the voltage signal V ₁₊ output from the peak hold device 60 indicates the detected value of the positive-side effective static elimination current I ₁₊ in the period T according to the equation (3) ′.
The peak hold device 60 detects the effective static elimination current I ₁₊ each time the high voltage V ₊ exponentially slightly decreases.

As described above, the voltage signal V ₁₊ obtained by the peak hold device 60 is given to the comparator 51 as a detection value of the effective static elimination current I ₁₊ . Therefore, the positive-side instruction value generating means 52 uses the voltage signal V indicating the detected value of the effective static elimination current I _1+.
The level of ₁₊ is the set voltage V _{1S +} indicating the set value of the effective static elimination current I ₁₊ given to the comparator 51 by the positive side setter 23.
To generate the positive-side high-voltage instruction value signal V _{C1 +} . Then, ₊ the signal V _C1 positive side high voltage instruction value comprising caused exponential slight change in response to an instruction value processing unit 53 to the ₊ signal V _C2 is applied via an adder 54 to the positive side high voltage generating circuit 3. Thereby, the discharge electrode 1
The high voltage V _{+ applied} to the effective static elimination current I ₁₊ is equal to the set value, in other words, the effective static elimination current I _1+.
The high voltage V ₊ is controlled so that the amount of positive ions generated by that which contributes to the static elimination becomes the set amount indicated by the set value of the effective static elimination current I ₁₊ .

Further, as described above, the peak hold unit 60
The voltage signal V ₁₊ (detection value of the effective static elimination current I ₁₊ ) obtained by the above is given to the subtractor 62, and the voltage signal Va obtained from the differential amplifier 38 of the effective current difference detection means 17 is given.
(Current Ia) is given to the subtractor 62 via the filter 63, and at this time, the subtractor 62 performs the subtraction operation according to the equation (22) to detect the detected value of the negative side effective static elimination current I ₁₋ . the outputs _{of 2-voltage} signal V shown, this effective neutralization current I _1-is detected by. Then, the voltage signal V ₂₋ is given to the comparator 45 via the variable resistor 68.

At this time, the voltage signal V ₁₊ (detection value of the effective static elimination current I ₁₊ ) is also given to the comparator 45 from the peak hold device 60, and therefore the negative side instruction value generating means 46 is , the voltage signal indicating the effective charge removing current I detected value of the _{1-V 1-}
The negative side high voltage indicating value signal V _C1- so that the level of the positive side effective voltage V1 ₊ indicates the detected value of the positive side effective static elimination current I ₁₊ with a predetermined ratio determined by the resistance value of the variable resistor 68.
Generate Then, the signal V _C1− is applied to the negative side high voltage generation circuit 4 via the adder 50. Thereby, the high voltage V ₋ applied to the discharge electrode 2 is such that the negative side effective static elimination current I ₁₋ matches the positive side effective static elimination current I _{1+ at} a predetermined ratio, in other words, Negative side effective static elimination current I _1-
The high voltage V ₋ is controlled so that the generation amount of negative ions generated by the above and contributing to the static elimination balances with the generation amount of the positive ions generated by the effective static elimination current I ₁₊ that contributes to the static elimination. In general, even if the negative side effective static elimination current I ₁₋ and the positive side effective static elimination current I ₁₊ are the same, positive ions have a smaller effect of contributing to static elimination than negative ions. By setting the negative side effective static elimination current I ₁₋ to be smaller than the positive side effective static elimination current I ₁₊ , positive and negative ions are balanced.

On the other hand, at the time of such an operation, as in the case of detecting the positive side effective static elimination current I ₁₊ , the case grounding resistor 12
A current Ib flowing through is detected by the electrode / chassis reactive current difference detection means 19, and further from the peak hold device 61 via the differentiator 20 according to the above equation (5) ′, the positive electrode / chassis reactive current. A voltage signal V ₂₊ indicating the detected value of I ₂₊ is output. Further, similarly to the case of detecting the negative side effective static elimination current I ₁₋ , the voltage signal V ₂₊ and the voltage signal Vb of the amplifier 44 are detected.
And the subtracter 64 calculates the voltage signal V indicating the detected value of the reactive current I ₂₋ between the negative electrode and the housing according to the equation (23).
_2- is obtained. In addition, the voltage signal V of the differential amplifier 41
_{S +} (total discharge current I _{S +} ), voltage signal V ₁₊ of peak hold device 60 (detection value of positive side effective static elimination current I ₁₊ ), and voltage signal V ₂₊ of peak hold device 61 (positive electrode / The detected value of the reactive current I ₂₊ between the housings) and the (2
According to the equation 6), the voltage signal V indicating the inter-electrode reactive current I ₃
You get ₃ .

When the voltage signal V ₂₊ level of the peak hold unit 61 exceeds a predetermined ratio with respect to the level of the voltage signal V _{S +} of the differential amplifier 41, the alarm means 34 outputs:
In other words, when the ratio of the reactive current I ₂₊ between the positive electrode and the housing to the total discharge current I _{S +} becomes abnormally high, the alarm 74 issues an alarm according to the output of the comparator 73.

Similarly, the alarm means 35, based on the voltage signal V ₂₋ of the subtractor 64 and the voltage signal V _S− of the differential amplifier 42,
When the ratio of the negative side electrode-chassis reactive current I _{2 − to} the total discharge current I _{S −} becomes abnormally high, the alarm device 76 issues an alarm according to the output of the comparator 75.

The state in which the alarm means 34, 35 issue an alarm in this manner is considered to be the cause of insulation failure between the discharge electrodes 1, 2 and the housing 7, and such an alarm can detect such an abnormality. ..

Further, the alarm means 36 is based on the voltage signal V ₃ of the subtractor 66 and the voltage signal V _{S +} of the differential amplifier 41, or the voltage signal V ₃ and the voltage signal V _{S- of the} differential amplifier 42. Based on the total discharge current I _{S +} or I _{S- of the} reactive current I ₃ between the electrodes
When the ratio of the
Alternatively, an alarm is issued from an alarm device 79 according to the output of 78.
The state in which such an alarm is issued indicates a state in which there is a leakage current between the discharge electrodes 1 and 2, and such an abnormality is grasped by the alarm.

Further, the positive side high voltage instruction value signal V _{C3 +} obtained by correcting the level of the positive side high voltage instruction value signal V _{C2 +} which has caused a minute change by the adder 54 is given to the alarm means 32, and The alarm means 32 uses the positive side high voltage instruction value signal V _{C3 +.}
When the level of is higher than the maximum voltage level V _{+ MAX} , the alarm 70 issues an alarm according to the output of the comparator 69. The state in which such an alarm is issued is a state in which the effective static elimination current I ₁₊ cannot rise to the set value even if the high voltage V ₊ is increased, and therefore the cause of contamination of the discharge electrode 1 is considered. Then, the alarm can prompt the user to clean the discharge electrode 1 or the like.

Similarly, the negative side high voltage indicating value signal V _C2- is given to the alarm means 33, and the alarm means 33 _makes the level of the negative side high voltage indicating value signal V _C2- higher than the maximum voltage level V _-MAX. Then, the alarm 72 issues an alarm according to the output of the comparator 71. This can prompt the user to clean the discharge electrode 2 and the like.

As described above, in the static eliminator of this embodiment, by detecting each effective static elimination current I ₁₊ , I _1- , the amount of positive and negative ions contributing to the static elimination can be grasped,
It is possible to control them to a desired production amount, and therefore it is possible to surely remove the charge of the charged body (not shown) by making the positive and negative ion balance good. At this time, since the total amount of each of the effective static elimination currents I ₁₊ and I ₁₋ is detected, the detection can be surely performed, and thus the positive and negative ion generation amounts can be surely set to desired values. The production amount can be controlled.

Further, each effective static elimination current I₁₊, I_1-To detect
In addition, reactive current I between each electrode and housing ₂₊, I_2-Or between electrodes
Effective current I₃By also detecting the
Can be accurately monitored.

Further, in order to detect the effective static elimination current I ₁₊ and the reactive current I ₂₊ between the electrode and the case, the high voltage instruction value signal V _{c1 +}
Since the minute fluctuations that occur in the above are made into the exponential minute fluctuations, the effective static elimination current I ₁₊ and the reactive current between the electrode and the case are extremely simple with the differentiators 18 and 20 and the peak hold devices 60 and 61. I ₂₊ can be detected.

In this embodiment, a slight fluctuation is generated in the positive side high voltage instruction value signal V _{C1 +} , and dV ₊ / dt >>
dV - was a _/ dt condition is satisfied, conversely therewith, dV - _/ dt»dV - _/ dt conditions to meet to the negative high voltage instruction value signal V _C1- caused a slight change, It is also possible to detect the negative side effective static elimination current I ₁₋ and the negative side electrode-chassis reactive current I ₂₋ by using a differentiator or a peak holder similar to that of this embodiment.

Further, in this embodiment, each effective charge removal is performed.
Flow I₁₊, I_1-In addition to the detection of
I₂₊, I_2-And reactive current between electrodes I₃To detect
However, each effective static elimination current I₁₊, I_1-Detect only, yes
Is the effective static elimination current I₁₊, I _1-And reactive current between each electrode and housing
Flow I₂₊, I_2-It is also possible to detect only
It For example, each effective static elimination current I₁₊, I_1-Place to detect only
In this embodiment, the negative side discharge current detection means 30
And electrode / casing reactive current difference detection means 19 and differentiator 2
0, peak hold device 61, subtractors 31, 64, alarm hand
The steps 34-36 may be deleted. Also, each effective static elimination current
I₁₊, I_1-And reactive current I between each electrode and housing ₂₊, I_2-Only
When detecting, the subtractor 66 and the alarm means 36 are deleted.
Just do it.

Further, in the present embodiment, the reactive current contained in the discharge current is detected separately by the reactive currents I ₂₊ and I ₂₋ between the electrodes and the housing and the reactive current I ₃ between the electrodes. But,
It is also possible to detect the total reactive current in each of the discharge electrodes 1 and 2 together. In this case,
For example, in the present embodiment, the differential current difference detecting means 19 between the electrode and the housing, the differentiator 20, the peak hold device 61, the subtracter 64, the alarm means 34, 35, etc. are deleted, and the differential amplifier 4 is removed.
1 and a subtracter for subtracting the voltage signal V ₁₊ (effective static elimination current I ₁₊ ) of the peak hold device 60 from the voltage signal V _{S +} (total discharge current I _{S +} ) and the voltage signal V _S- (of the differential amplifier 42) If a subtracter that subtracts the voltage signal V ₁₋ (effective static elimination current I ₁₋ ) of the subtractor 62 from the total discharge current I _S− ) is provided, the total invalidity in each of the discharge electrodes 1 and 2 is obtained by those subtractors. Current can be detected.

Further, in the present embodiment, the first aspect of the present invention
The case where the casing 7 is made of a conductive material has been described in accordance with the above aspect. However, even when the casing is made of an insulating material in accordance with the third aspect of the present invention, a static eliminator similar to this embodiment can be used. Can be configured. In this case, for example, in the present embodiment, the case grounding resistor 12, the electrode / case reactive current difference detection means 19, the differentiator 20, and the peak hold device 6 are provided.
1, the subtractor 64, the alarm means 34 and 35 may be deleted, and the circuits such as the differential amplifier 38 other than the high voltage generation circuits 3 and 4 may be grounded at any appropriate places. The grounding is performed on the metal portion, for example, when the housing has a metal portion on the surface opposite to the discharge electrodes 1 and 2. In this case, the subtractor 66
Is the voltage signal V _{S +} of the differential amplifier 41 (total discharge current I _{S +} ).
The voltage signal V ₁₊ (effective static elimination current I ₁₊ ) of the peak hold device 60 is subtracted from the above.

Further, in this embodiment, the high voltage control means 21, 22 and the differentiating means 18, 20, the effective static elimination current detecting means 25, 26, the electrode / casing reactive current detecting means 27,
28, the inter-electrode reactive current detecting means 31 is constructed in a circuit, but it goes without saying that these may be constructed using a microcomputer.

Further, in this embodiment, the high voltage generation circuits 3 and 4 generate the high DC voltages V ₊ and V ₋ , but the secondary side coils of the transformers 5 and 6 are used for rectification. If the diode of is connected, the voltage applied to the primary side of each transformer 5, 6 will be at a relatively low frequency (for example, 20 to 30 k).
Alternatively, an AC voltage of (Hz) may be used. In this case, the current I
Although a, Ib, I _{S1 +} and I _S1− are half-wave DC, they should be smoothed by the filters 37, 43, 39, 40 provided on the input side of the amplifiers 38, 44, 41, 42. Therefore, the currents Ia, Ib, I _{S1 +} , I _S1- can be detected to detect the effective static elimination currents I ₁₊ , I _1-, etc.

Next, a concrete embodiment of the second aspect of the present invention will be described with reference to FIGS. FIG. 7 is a circuit configuration diagram of the static eliminator of this embodiment.

The static eliminator of this embodiment has the same basic configuration as that of the static eliminator shown in FIG. 2, and has positive and negative discharge electrodes 1 and 2 and positive and negative high voltage generating circuits 3 and 4. And the positive and negative side transformers 5 and 6, and a housing 7 made of a conductive material.
2, a pair of resistors 13 and 14 for external grounding, and a pair of resistors 15 and 16 for grounding the housing, and the connection configuration of these is the same as that of the static eliminator of FIG. The high voltage generating circuits 3 and 4 are the same as those of the static eliminator shown in FIG. 5 described above, and their ground portions are connected to the ground ends of the secondary coils of the corresponding transformers 5 and 6. .

The static eliminator of this embodiment is similar to the static eliminator of FIG. 5 described above, in which the high voltage control means 21 and 22, the differentiating means 18 and 20, the effective static eliminator current detecting means 25 and 26, the electrodes and the casing. Inter-electrode reactive current detection means 27, 28, inter-electrode reactive current detection means 31, setting means 23, 24 and alarm means 32.
Equipped with ~ 36. These configurations are exactly the same as those of the static eliminator of FIG. 5, and detailed description thereof will be omitted here.

On the other hand, in the static eliminator of this embodiment, the effective static elimination currents I ₁₊ , I ₁₊ ,
The effective current difference detection means 80 for detecting the current Ia of the difference between I _{1− and} the difference between the reactive currents I ₂₊ and I ₂₋ between the electrodes and the case due to the difference in voltage between the housing grounding resistors 15 and 16. Positive side discharge for detecting the total discharge current I _{S +} of the discharge electrode 1 by the sum of the voltage of the electrode / chassis reactive current difference detection means 81 for detecting the current Ib and the voltage of the external grounding resistor 13 and the casing grounding resistor 15. The current detection means 82 and the negative side discharge current detection means 83 for detecting the total discharge current I _S− of the discharge electrode 2 based on the sum of the voltages of the external grounding resistance 14 and the housing grounding resistance 16 are provided. Each circuit to be described later, which constitutes these means 80 to 83, is the case 7
Grounded to.

The active current difference detecting means 80 includes a pair of filters 84 and 85 connected to both ends of each of the external grounding resistors 13 and 14, and a differential amplifier 86 which receives the outputs of the filters 84 and 85 of each pair. , 87 and the voltage signal Vc output from the differential amplifier 86 at a level proportional to the current Ic of the external grounding resistor 13, and at a level proportional to the current Id of the external grounding resistor 14 from the differential amplifier 87. And a subtracter 88 for subtracting the output voltage signal Vd, and outputs the voltage signal Va at a level corresponding to the difference between the voltages of the external grounding resistors 13 and 14, that is, the current Ia (3).
The configuration is obtained from the subtractor 88 according to the equation (0).

Similarly, the reactive current difference detecting means 81 between the electrode and the case is constituted by the case 7 of the case grounding resistors 15 and 16.
And filters 89 and 9 respectively connected to the ends on the opposite side to
0, amplifiers 91 and 92 that receive the outputs of the filters 89 and 90, and a voltage signal V that is output from the amplifier 91 at a level proportional to the current Ie of the housing grounding resistor 15.
e is composed of a subtractor 93 for subtracting the voltage signal Vf output from the amplifier 92 at a level proportional to the current If of the external grounding resistor 16, and the housing grounding resistor 1
The difference between the voltages of 5 and 16, that is, the voltage signal Vb having a level proportional to the current Ib is subtracted by the subtractor 93 according to the equation (31).
The configuration is obtained from.

The positive side discharge current detecting means 82 has the voltage signal Vc of the differential amplifier 86 and the voltage signal Ve of the amplifier 91.
And a sum of the voltages of the external grounding resistor 13 and the chassis grounding resistor 15 connected to the positive side transformer 5 side, that is, a level proportional to the positive side total discharge current I _{S +.} Of the voltage signal V _{S +} is obtained from the adder 94 according to the equation (32).

Similarly to this, the negative side discharge current detecting means 83
Is composed of an adder 95 that adds the voltage signal Vd of the differential amplifier 87 and the voltage signal Vf of the amplifier 92, and is connected to the negative transformer 6 side by the external grounding resistor 14 and the chassis grounding resistor 16. The voltage signal V _S− having a level proportional to the sum of the voltages, that is, the negative-side total discharge current I _S− is obtained from the adder 95 according to the equation (33).

The static eliminator having such a configuration is different from the static eliminator of FIG. 5 only in the method of detecting the currents Ia, Ib and the total discharge currents I _{S +} , I _S- , and other operations are the same as those of FIG. It is exactly the same as the static eliminator. That is, each effective static elimination current I ₁₊ ,
I ₁₋ is detected by each of the effective static elimination current detecting means 25 and 26, whereby the production amount of positive and negative ions contributing to the static elimination can be grasped and controlled to a desired production amount, and therefore positive and negative. It is possible to surely remove the charge of the charged body (not shown) by improving the ion balance of the above.
At this time, since the total amount of each of the effective static elimination currents I ₁₊ and I ₁₋ is detected, the detection can be surely performed, and thus the positive and negative ion generation amounts can be surely set to desired values. The production amount can be controlled.

Further, each effective static elimination current I₁₊, I_1-To detect
In addition, reactive current I between each electrode and housing ₂₊, I_2-Or between electrodes
Effective current I₃Is a reactive current detecting means 27, 2 between each electrode and the case
8 or the inter-electrode reactive current detection means 31 detects the
Based on the detected value from the
It is possible to accurately monitor the health of the device and abnormalities of the device.
It

Further, in order to detect the effective static elimination current I ₁₊ and the reactive current I ₂₊ between the electrode and the case, the high voltage instruction value signal V _{c1 +}
Since the minute fluctuation caused by the positive side high voltage control means 21 is regarded as an exponential minute fluctuation, the differentiator 1
The effective static elimination current I ₁₊ and the reactive current I ₂₊ between the electrode and the case can be detected with an extremely simple configuration using the 8, 20 and the peak hold devices 60, 61.

In this embodiment, a slight fluctuation is generated in the positive side high voltage instruction value signal V _{C1 +} , and dV ₊ / dt >>
dV - _/ dt was the condition is satisfied, as in the case of the static eliminator of Fig. _{5, dV - / dt»dV - /} dt conditions satisfying way _C1- to the negative side high voltage instruction value signal V It is also possible to cause a slight change to detect the negative side effective static elimination current I ₁₋ and the negative side electrode-chassis reactive current I ₂₋ .

In addition, each effective static elimination current I₁₊, I_1-Only inspect
Output or each effective static elimination current I ₁₊, I_1-And each electrode
Inter-casing reactive current I₂₊, I_2-Only to detect
Both are possible. For example, each effective static elimination current I₁₊, I_1-only
In this example, the negative side discharge current
Detecting means 83, subtractor 93, differentiating means 20, electrodes / casing
Inter-body reactive current detection means 27, 28, Inter-electrode reactive current detection
The means 31 and the alarm means 34 to 36 may be deleted. Well
Also, each effective static elimination current I₁₊, I_1-And reactive current between each electrode and housing
Flow I₂₊, I_2-When detecting only the
The detection means 31 and the alarm means 36 may be deleted.

As in the case of the static eliminator of FIG. 5, it is also possible to detect the total reactive current in each of the discharge electrodes 1, 2. In this case, for example, in the present embodiment, the subtractor 93, the differentiating means 20, the electrode / casing reactive current detecting means 27, 28, the alarm means 34, 35, etc. are deleted, and the voltage signal V _{S +} of the adder 94 is deleted. A subtracter for subtracting the voltage signal V ₁₊ (effective static elimination current I ₁₊ ) of the first effective static elimination current detection means 25 from the (total discharge current I _{S +} ) and the voltage signal V _S− of the adder 95 (total discharge) If a subtracter for subtracting the voltage signal V ₁₋ (effective static elimination current I ₁₋ ) of the second effective static elimination current detection means 26 from the current I _S− ) is provided, each of the discharge electrodes 1, 2 The total reactive current in 2 can be detected.

In the present embodiment, the second aspect of the present invention is used.
The case where the housing 7 is made of a conductive material has been described in accordance with the above aspect. However, even when the housing is made of an insulating material in accordance with the fourth aspect of the present invention, a static eliminator similar to this embodiment can be used. Can be configured. In this case, for example, in the present embodiment, the housing grounding resistors 15 and 16, the subtractor 93, the differentiating means 20, the electrode / casing reactive current detecting means 27 and 2 are provided.
8. The alarm means 34 and 35 may be deleted, and the circuits other than the high voltage generation circuits 3 and 4 may be grounded at any suitable places. still,
In this case, the inter-electrode reactive current detection means 31 uses the voltage signal V _{S +} (total discharge current I _{S +} ) of the adder 94 to calculate the voltage signal V ₁₊ (effective discharge current I _{S +} ) of the first effective charge removal current detection means 25.
₁₊ ) only is subtracted.

Also in the present embodiment, the high voltage control means 21, 22 and the differentiating means 18, 20, the effective static elimination current detecting means 25, 26, the electrode / casing reactive current detecting means 27,
Of course, the inter-electrode reactive current detection means 31 can be configured by using a microcomputer.

Also in this embodiment, if a rectifying diode is connected to the secondary coil of each transformer 5, 6, the voltage applied to the primary side of each transformer 5, 6 will be at a relatively low frequency (eg, An alternating voltage of 20 to 30 kHz) may be used.

By the way, in each of the embodiments described above, the minute fluctuation caused in the positive-side high-voltage command value signal V _{C1 +} is defined as an exponential minute fluctuation, and the above-mentioned (3) ′,
The rate of change dI of the currents Ia and Ib with time according to the equation (5) ′
The positive side effective static elimination current I ₁₊ and the positive side electrode-chassis reactive current I ₂₊ are detected directly by a / dt and dIb / dt. age,
Using the value K ₊ of the ratio between the high voltage V ₊ and the temporal change rate dV ₊ / dt in the above equations (3) and (5), the positive side effective static elimination current I ₁₊ and the positive side electrode / chassis are used. It is also possible to detect the reactive current I ₂₊ . Next, an embodiment of the present invention that performs such detection will be described with reference to FIGS. 8 and 9. FIG. 8 is a circuit configuration diagram of the static eliminator of this embodiment, and FIG. 9 is a diagram for explaining the operation of the static eliminator of this embodiment.

Incidentally, in this embodiment, corresponding to the first mode of the present invention, an external grounding resistor and the like are provided with the same connection configuration as the static eliminator of FIG. 1 and FIG. 5 here. , Illustration of these resistors is omitted. Further, the same components as those of the static eliminator of FIG. 5 will be described with the same reference numerals.

In FIG. 8, the static eliminator of this embodiment is similar to the static eliminator of FIG. 5, in which the discharge electrodes 1 and 2, the high voltage generating circuits 3 and 4, the transformers 5 and 6, the casing 7, Discharge current detecting means 29, 30, active current difference detecting means 17, electrode / casing reactive current difference detecting means 19, differentiator (differentiating means) 18, 20, and second effective charge eliminating current detecting means 26.
A second electrode-chassis reactive current detection means 27, an inter-electrode reactive current detection means 31, and a negative high voltage control means 22.
And setting means 23 and 24, and alarm means 32 to 36. These configurations are exactly the same as those of the static eliminator of FIG. 5, and detailed description thereof will be omitted here.

On the other hand, the static eliminator of this embodiment is different from that of the static eliminator of FIG. 5 in that the first effective static eliminator current detecting means 96, the first electrode-chassis reactive current detecting means 97 and the positive side. A high voltage control means 98, further comprising the above (3),
The high voltage V ₊ and its temporal change rate dV _{+ in the} equation (5)
The calculation means 99 for obtaining the value K ₊ of the ratio with / dt is provided.

The positive side high voltage control means 98 compares the detected value of the positive side effective static elimination current I ₁₊ given by the effective static elimination current detecting means 96 with the set value given by the setting means 23 as described later. a comparator (comparison means) 51, a positive indication value generating means 52 for generating a positive side high voltage instruction value signal V _{C1 +} from the output of the comparator 51, a slight change in the ₊ positive high voltage instruction value signal V _C1 an instruction value processing unit 100 for generating a positive high voltage instruction value signal V _{C2 +} comprising caused, an adder 54 for correcting the level compatible with the positive high voltage instruction value signal V _{C2 +} level of the high voltage generating circuit 3 Is equipped with. Here, the comparator 51, the positive side instruction value generating means 52, and the adder 5
4 has the same structure as that of the static eliminator of FIG. 5, and the positive side instruction value generating means 52 is composed of a time constant circuit composed of a resistor 55 and a capacitor 56. Therefore, the positive side high voltage instruction value signal V generated by the positive side instruction value generating means 52.
Similar to the static eliminator of FIG. 5, the level of _{C1 +} gradually increases or decreases so that the positive side effective static neutralization current I ₁₊ matches its set value.

The indicated value processing means 100 includes a sine wave generating circuit 101 for generating a sine wave signal and a positive side indicated value generating means 5.
Upper and lower limit judgment device 1 which receives as input the positive side high voltage indication value signal V _{C1 +} generated by 2 and the output of the sine wave generation circuit 101
02 and a sample and hold unit 103 that samples and holds the output of the sine wave generation circuit 101 using the output of the upper and lower limit decision unit 102 as a sample / hold signal.
A sine wave signal is generated with a cycle sufficiently shorter than the time constant of.

The upper and lower limit determination unit 102 outputs a hold signal to the sample and hold unit 103 every time the level of the sine wave signal exceeds a predetermined upper limit value and lower limit value with respect to the level of the positive side high voltage instruction value signal V _{C1 +.} As a result, the sample-and-hold device 103 outputs the signal V _{C2 +} as shown in FIG. 9 within a minute time in which the level of the positive-side high-voltage command value signal V _{C1 +} is considered to be substantially constant. Therefore, by setting the widths of the upper limit value and the lower limit value to be sufficiently smaller than the level of the positive side high voltage instruction value signal V _{C1 +} , the signal V _{C2 +} becomes the positive side high voltage instruction value signal V. _{C1 +}
The positive side high voltage instruction value signal V _{C2 + has} a form in which a minute fluctuation is repeatedly generated, and this is given to the positive side high voltage generation circuit 3 via the adder 54 as in the static eliminator of FIG. Then, the high voltage generation circuit 3 generates a high voltage V ₊ having a level proportional to the positive side high voltage instruction value signal V _{C2 +.}
Given to.

The arithmetic means 99 has a filter 104 for smoothing the positive side high voltage instruction value signal V _{C2 +} obtained from the sample and hold unit 103, and a positive side high voltage instruction value signal V _{C2 +.}
Differentiator 105 for differentiating, a positive peak hold device 106 having an output of the differentiator 105 as an input, and a filter 10
4 and a divider 107 for obtaining the ratio of the output signal levels of the peak hold device 106, and the peak hold device 106 has a time T (see FIG. 9) at which the positive side high voltage instruction value signal V _{C2 +} slightly decreases. The voltage signal of a level corresponding to the temporal change rate of the positive side high voltage instruction value signal V _{C2 +} at, that is, the temporal change rate dV ₊ / dt of the high voltage V ₊ is output to the divider 107. Then, the filter 104 outputs the positive side high voltage instruction value signal V corresponding to the average level of the high voltage V _+.
The average level of _{C2 +} is output to the divider 107.

As a result, the divider 107 generates a voltage signal V _{K +} having a level indicating the value K ₊ of the ratio between the high voltage V ₊ and the temporal change rate dV ₊ / dt within the minute time T. A ratio value K ₊ will be obtained.

The first effective static elimination current detecting means 96 is
Peak hold device 1 which receives the output of the differentiator 18
08 and a multiplier 109 that multiplies the output of the peak hold unit 108 and the output of the divider 107. The multiplier 1 outputs a voltage signal of a level corresponding to the temporal change rate dIa / dt of the current Ia at the time T (see FIG. 9) at which the voltage instruction value signal V _{C2 +} slightly decreases.
It outputs to 09.

As a result, the multiplier 109 has the above (3)
According to the equation, the positive side effective static elimination current I ₁₊ is detected, and the voltage signal V _{1+ of the} level indicating the detected value is output to the comparator 51 of the high voltage control means 98 or the like.

Similarly, the first electrode-chassis reactive current detecting means 97 is composed of a peak hold device 110 and a multiplier 111 provided on the output side of the differentiator 20, and the multiplier 111. From the above, the voltage signal V ₂₊ indicating the detected value of the reactive current I ₂₊ between the positive electrode and the housing is calculated according to the equation (5).
Is output to the alarm means 34 and the like.

As described above, in the static eliminator of this embodiment, the value K ₊ of the ratio is obtained by determining the minute fluctuation of the positive side high voltage instruction value signal V _{C2 +} as an exponential minute fluctuation.
The positive side effective static elimination current I ₁₊ and the positive side electrode-chassis reactive current I ₂₊ can be detected according to the equations (3) and (5). Then, based on those detected values, the negative side effective static elimination current I ₁₋ and the negative side electrode
The reactive current I _{2 −} between the casings and the reactive current I ₃ between the electrodes are detected,
Therefore, the ion balance control, the discharge state monitoring, and the like can be performed in the same manner as in the case of the static eliminator of FIG.

Although the present embodiment has been described in association with the first aspect of the present invention, for example, the embodiment of FIG. 7 corresponding to the second aspect of the present invention is also similar to the present embodiment. Configurations can be applied. In this case, the discharge current detection means 29, 30, the active current difference detection means 17 and the electrode-chassis reactive current difference detection means 19 in this embodiment.
Instead of the discharge current detecting means 8 in the embodiment of FIG.
2, 83, active current difference detecting means 80, and electrode / casing reactive current difference detecting means 81 may be provided.

In this embodiment, the case where the positive side ratio value K ₊ is obtained has been described, but the negative side high voltage V
₊ To be caused a slight change, the negative ratio of the value K _- can be performed similarly when seeking.

Further, in the present embodiment, the sine wave signal is used in order to cause a slight fluctuation in the positive side high voltage instruction value signal V _{C1 +,} but the present invention is not limited to this, and various kinds of waves such as a triangular wave and a sawtooth wave are used. Waveform signals can be used.

Further, although the case where the housing 7 is made of a conductive material has been described in the present embodiment, the case shown in FIG.
As in the case of the static eliminator, the static eliminator similar to that of the present embodiment can be configured even when the housing 7 is made of an insulating material, and further, as described in the static eliminator of FIGS. 5 and 7. Various modifications are possible.

[0228]

As is apparent from the above description, according to the present invention, regardless of whether the casing material is a conductive material or an insulating material, an external grounding resistor or the like is appropriately connected, and By controlling the high voltages V ₊ and V ₋ applied to each discharge electrode from each high voltage generation circuit so that the relationship of (1) and (2) is satisfied for each minute, the discharge current flowing in each discharge electrode is controlled. , The positive and negative side effective static elimination currents that generate positive and negative ions contributing to static elimination can be detected with a simple configuration. Therefore, by controlling each effective static elimination current, the positive and negative ions contributing to static elimination can be Generation can be controlled. Then, since the total amount of each effective static elimination current is detected, the detection can be reliably performed, and thus the total production amount of positive and negative ions contributing to static elimination can be surely controlled as desired. .

Further, by properly connecting the case grounding resistor and the like, the reactive current between each electrode and the case and the reactive current between the electrodes can be determined depending on whether the case is a conductive material or an insulating material. Can be detected with a simple configuration, and by performing these detections, the operating state of the static eliminator, such as whether or not the discharge state is good, can be appropriately monitored.

Further, in controlling each high voltage generation circuit, each high voltage instruction value for instructing the value of each high voltage V ₊ , V ₋ is generated so as to be substantially constant within a small time including the minute time. At the same time, by causing a minute fluctuation in one of the high voltage indication values within the minute time, each of the high voltages V ₊ and V can satisfy the relations (1) and (2) with a relatively simple configuration. _- it can be controlled, thus, it is possible to easily configure static eliminator with the effects described above.

In particular, by setting the minute fluctuations to be exponential minute fluctuations, the temporal change rate dIa / dIa /
If dt is obtained, one effective static elimination current can be directly detected by the temporal change rate dIa / dt, and the configuration for detecting each effective static elimination current can be made extremely simple. Further, such an exponential minute fluctuation can be configured by using an extremely simple time constant circuit composed of a resistor and a capacitor. Therefore, it is possible to provide a static eliminator having the above-mentioned effects with a simple and inexpensive structure.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining a basic principle of a first aspect of the present invention.

FIG. 2 is an explanatory diagram for explaining a basic principle of a second aspect of the present invention.

FIG. 3 is an explanatory diagram for explaining a basic principle of a third aspect of the present invention.

FIG. 4 is an explanatory diagram for explaining a basic principle of a fourth aspect of the present invention.

FIG. 5 is a circuit configuration diagram of a static eliminator according to an embodiment of the first aspect of the present invention.

FIG. 6 is a diagram for explaining the operation of the static eliminator of FIG.

FIG. 7 is a circuit configuration diagram of a static eliminator according to an embodiment of the second aspect of the present invention.

FIG. 8 is a circuit configuration diagram of a static eliminator according to another embodiment of the first aspect of the present invention.

9 is a diagram for explaining the operation of the static eliminator of FIG.

[Explanation of symbols]

1, 2 ... Discharge electrodes, 3, 4 ... High-voltage generation circuit, 5, 6 ...
Transformer, 7 ... Housing, 10 ... External grounding portion, 11, 13,
14 ... External grounding resistance, 12, 15, 16 ... Casing grounding resistance, 17, 80 ... Active current difference detecting means, 18 ... First
Differentiating means, 19, 81 ... Electrode / casing reactive current difference detecting means, 20 ... Second differentiating means 21, 22, 98 ... High voltage control means, 25, 96 ... First effective static elimination current detecting means , 26 ... Second effective static elimination current detecting means, 27, 97 ...
First electrode / casing reactive current detecting means, 28 ... Second electrode / casing reactive current detecting means, 29, 30, 82, 83
... discharge current detection means, 31 ... inter-electrode reactive current detection means,
46, 52 ... Indication value generating means, 53, 100 ... Indication value processing means, 58 ... Resistor, 59 ... Capacitor.

Claims (12)

[Claims] 1. A positive-side discharge electrode and a negative-side discharge electrode, a positive-side transformer and a negative-side transformer in which one end of a secondary-side coil is connected to each discharge electrode, and each discharge electrode via each transformer. A positive-side high-voltage generating circuit and a negative-side high-voltage generating circuit that generate and give a positive high voltage and a negative high voltage, and the discharge electrode, the transformer, and the high-voltage generating circuit with the discharge electrode facing outward. In a static eliminator provided with a housing made of a conductive material that is housed, the other ends of the secondary coils of the positive side transformer and the negative side transformer, which are grounding ends, are connected to each other, and the connecting portion is connected to the casing. It is connected to an external external grounding part through an external grounding resistance, and the case is connected to the connection part of the grounding ends of the secondary coils of both transformers. Generates ions that contribute to static elimination Positive effective charge removing current (I ₁₊₎ and negative effective charge removing current (I _1-) of the difference (Ia = I ₁₊ -I _1-) is detected by a voltage generated in the external grounding resistor effective current difference detection time rate of change of (dV ₊ / dt and dV _- means a positive side high voltage (V ₊₎ and negative high voltage is applied to the each discharge electrodes by the respective high voltage generating circuit (V) - _/ dt ) Is [Equation 1] Of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) within the minute time, the change amounts (ΔV ₊ , ΔV ₋ ) are ΔV ₊ << V ₊ and ΔV _- «V _- ...... and the high voltage control means for controlling each high voltage generating circuit so as to satisfy the relation (2), both active neutralization current obtained by the effective current difference detection means in said short time Difference between (I ₁₊ , I ₁₋ ) (Ia)
The differential means for obtaining the temporal change rate (dIa / dt) of the effective static elimination current (I ₁₊ or I ₁₋ ) of both the effective static elimination currents (I ₁₊ , I ₁₋ ) Of the first effective charge removing current detecting means for determining by using the relational expression, the other effective neutralizing current (I _1-or I _1+), and both active neutralization current obtained by the effective current difference detecting means (I _{1 +} , I
₁₋ ) (Ia = I ₁₊ −I ₁₋ ) and the positive side effective static elimination current (I ₁₊ ) or negative side effective static elimination current (I ₁₋ ) obtained by the first effective static elimination current detection means. ) And second effective static elimination current detection means obtained by subtraction calculation or addition arithmetic operation, and controlling each effective static elimination current (I ₁₊ , I _1- ) obtained by each effective static elimination current detection means. A static eliminator that controls generation of positive and negative ions that contribute to static elimination. 2. The positive side discharge electrode of the current flowing at the time of discharge of each discharge electrode, wherein the case is connected to a connection part of the ground ends of the secondary side coils of the both transformers via a case grounding resistor. And a difference (Ib = I) between the reactive current (I ₂₊ ) between the positive electrode and the housing and the reactive current (I ₂₋ ) between the negative electrode and the housing that respectively flow between the negative discharge electrode and the housing. ₂₊ −I ₂₋ ) is detected by the electrode / chassis reactive current difference detection means for detecting the voltage generated in the case grounding resistance, and the electrode / case reactive current difference detection means within the minute time. Change rate (dIb /) of the difference (Ib) in the reactive current (I ₂₊ , I ₂₋ ) between the two electrodes and the housing
a second differentiating means for obtaining dt), and a reactive current (I ₁₊ or I ₂₋ ) between one electrode and the case of the reactive current (I ₂₊ , I ₂₋ ) between the electrodes and the case Number 3] The first electrode-chassis reactive current detection means and the other electrode-chassis reactive current (I ₂₋ or I ₂₊ )
Is a difference (Ib) between the reactive currents (I ₂₊ , I ₂₋ ) between the electrodes and the housing obtained by the reactive current difference detecting means between the electrodes and the housing.
= I ₂₊ −I ₂₋ ) and the reactive current between the positive electrode and the housing (I ₂₊ ) obtained by the first-electrode-to-housing reactive current detection means.
Or a second electrode-chassis reactive current detection means which is obtained by subtraction calculation or addition calculation from the negative side electrode-chassis reactive current (I _2- ). Static eliminator. 3. At least one of the discharge electrodes
Total discharge current of discharge electrode (I_{S +}Or I _S-) To detect discharge
Current detection means and the total discharge current (I_{S +}or
Is I_S-) Corresponding to the effective static elimination current (I₁₊or
Is I_1-) And the reactive current between the electrode and the housing (I₂₊Or I_2-)
By subtracting, there is no gap between the electrodes that flows between the two discharge electrodes.
Effective current (I₃) Is provided between the electrodes.
The static eliminator according to claim 2, which is obtained. 4. A positive-side discharge electrode and a negative-side discharge electrode, a positive-side transformer and a negative-side transformer each of which is connected to one end of a secondary-side coil, and each discharge electrode via each transformer. A positive-side high-voltage generating circuit and a negative-side high-voltage generating circuit that generate and give a positive high voltage and a negative high voltage, and the discharge electrode, the transformer, and the high-voltage generating circuit with the discharge electrode facing outward. In a static eliminator provided with a housing made of a conductive material housed therein, the other end, which is the ground end of the secondary coil of the positive transformer and the negative transformer, is connected in series via a pair of external grounding resistors. Connected to each other, the middle point of both external grounding resistors is connected to the external grounding portion outside the casing, and
The casing is connected to the connection between the grounding end of the secondary coil of at least one of the transformers and the external grounding resistor, and a positive electrode that generates ions that contribute to static elimination, out of the current that flows during discharge of each discharge electrode, is generated. The difference (Ia = I ₁₊ −I ₁₋ ) between the side effective static elimination current (I ₁₊ ) and the negative side effective static elimination current (I ₁₋ ) is detected by the difference between the voltages generated in the pair of external grounding resistors. Active current difference detection means, and the rate of change with time (dV ₊ / dt) of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) applied to each of the discharge electrodes by each of the high voltage generating circuits. dV _- / dt) is [number 4] Of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) within the minute time, the change amounts (ΔV ₊ , ΔV ₋ ) are ΔV ₊ << V ₊ and ΔV _- «V _- ...... and the high voltage control means for controlling each high voltage generating circuit so as to satisfy the relation (2), both active neutralization current obtained by the effective current difference detection means in said short time Difference between (I ₁₊ , I ₁₋ ) (Ia)
Differentiating means for obtaining the time change rate (dIa / dt) of the effective static elimination current (I ₁₊ or I ₁₋ ) of both effective static elimination currents (I ₁₊ , I ₁₋ ) Of the first effective charge removing current detecting means for determining by using the relational expression, the other effective neutralizing current (I _1-or I _1+), and both active neutralization current obtained by the effective current difference detecting means (I _{1 +} , I
₁₋ ) (Ia = I ₁₊ −I ₁₋ ) and the positive side effective static elimination current (I ₁₊ ) or negative side effective static elimination current (I ₁₋ ) obtained by the first effective static elimination current detection means. ) And second effective static elimination current detection means obtained by subtraction calculation or addition arithmetic operation, and controlling each effective static elimination current (I ₁₊ , I _1- ) obtained by each effective static elimination current detection means. A static eliminator that controls generation of positive and negative ions that contribute to static elimination. 5. The casings are connected to the connecting portions of the grounding ends of the secondary side coils of the both transformers and the pair of external grounding resistors through the respective casing grounding resistors, and each discharge is performed. Among the currents that flow when the electrodes are discharged, the reactive current (I ₂₊ ) between the positive side electrode and the case and the negative side electrode and the case that respectively flow between the positive side discharge electrode and the negative side discharge electrode and the case. An electrode / chassis reactive current difference detecting means for detecting a difference (Ib = I ₂₊ −I ₂₋ ) in the reactive current (I ₂₋ ) by a difference in voltage generated in the resistances for grounding the respective casings; The time change rate (dIb /) of the difference (Ib) between the reactive currents (I ₂₊ , I _{2 −} ) between the electrodes and the housing, which is obtained by the reactive current difference detecting means between the electrodes and the housing within the time.
a second differentiating means for obtaining dt), and a reactive current (I ₂₊ or I ₂₋ ) between one electrode and the case of the reactive current (I ₂₊ , I ₂₋ ) between both electrodes and the case Number 6] The first electrode-chassis reactive current detection means obtained by using the relational expression of and the other electrode-chassis reactive current is obtained by the electrode-chassis reactive current difference detection means. The difference (Ib = I ₂₊ −I _{2 −} ) between the reactive currents (I ₂₊ , I ₂₋ ) between the cases and the first
Subtraction operation or addition operation from the positive current between the positive electrode and the housing (I ₂₊ ) or the negative current between the negative electrode and the housing (I ₂₋ ) obtained by the reactive current detection means between the electrode and the housing 5. The static eliminator according to claim 4, further comprising: a second electrode-casing reactive current detection means obtained by 6. At least one of the two discharge electrodes
Total discharge current of discharge electrode (I_{S +}Or I _S-) To detect discharge
Current detection means and the total discharge current (I_{S +}or
Is I_S-) Corresponding to the effective static elimination current (I₁₊or
Is I_1-) And the reactive current between the electrode and the housing (I₂₊Or I_2-)
By subtracting, there is no gap between the electrodes that flows between the two discharge electrodes.
Effective current (I₃) Is provided between the electrodes.
The static eliminator according to claim 5, which is obtained. 7. A positive-side discharge electrode and a negative-side discharge electrode, a positive-side transformer and a negative-side transformer in which one end of a secondary-side coil is connected to each discharge electrode, and each discharge electrode via each transformer. A positive-side high-voltage generating circuit and a negative-side high-voltage generating circuit that generate and give a positive high voltage and a negative high voltage, and the discharge electrode, the transformer, and the high-voltage generating circuit with the discharge electrode facing outward. In a static eliminator provided with a housing made of an insulating material housed therein, the other ends of the secondary side coils of the positive side transformer and the negative side transformer, which are grounding ends, are connected to each other, and the connecting portion is connected to the casing. Positive side effective charge removal current (I ₁₊ ) and negative side effective charge removal that generate ions that contribute to charge removal from the current that flows when discharging each discharge electrode by connecting to an external grounding part via an external grounding resistor. Difference in current (I ₁₋ ) (Ia = I _{1 +} −I ₁₋ ) by means of a voltage generated in the resistance for external grounding, effective current difference detection means, and a positive side high voltage (V ₊ ) applied to each discharge electrode by each high voltage generation circuit, The negative side high voltage (V ₋ ) changes with time (dV ₊ / dt and dV ₋ / dt) are as follows: Of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) within the minute time, the change amounts (ΔV ₊ , ΔV ₋ ) are ΔV ₊ << V ₊ and ΔV _- «V _- ...... and the high voltage control means for controlling each high voltage generating circuit so as to satisfy the relation (2), both active neutralization current obtained by the effective current difference detection means in said short time Difference between (I ₁₊ , I ₁₋ ) (Ia)
Differentiating means for obtaining a temporal change rate (dIa / dt) of the effective static elimination current (I ₁₊ or I _1- ) of both effective static elimination currents (I ₁₊ , I _1- ) Of the first effective charge removing current detecting means for determining by using the relational expression, the other effective neutralizing current (I _1-or I _1+), and both active neutralization current obtained by the effective current difference detecting means (I _{1 +} , I
₁₋ ) (Ia = I ₁₊ −I ₁₋ ), and the positive side effective static elimination current (I ₁₊ ) obtained by the first effective static elimination current detection means.
Alternatively, a second effective static elimination current detection means for obtaining by subtraction calculation or addition calculation from the negative side effective static elimination current (I ₁₋ ) is provided, and each effective static elimination current (I ₁₊ , A static eliminator characterized by controlling the generation of positive and negative ions that contribute to static elimination by controlling I ₁₋ ). 8. A positive side discharge electrode and a negative side discharge electrode, a positive side transformer and a negative side transformer in which one end of a secondary side coil is connected to each discharge electrode, and each discharge electrode is connected via each transformer. A positive-side high-voltage generating circuit and a negative-side high-voltage generating circuit that generate and give a positive high voltage and a negative high voltage, and the discharge electrode, the transformer, and the high-voltage generating circuit with the discharge electrode facing outward. In a static eliminator provided with a housing made of an insulating material housed therein, the other end, which is the ground end of the secondary coil of the positive transformer and the negative transformer, is connected in series via a pair of external grounding resistors. Connected to each other, and the middle point of both external grounding resistors is connected to the external grounding part outside the casing, and positive side effective to generate ions that contribute to static elimination in the current flowing at the time of discharge of each discharge electrode. neutralization current (I ₁₊₎ and negative effective The effective current difference detecting means for detecting the difference in DENDEN flow (I _1-) of the difference (Ia = I ₁₊ -I _1-) the voltage generated in the pair of external grounding resistors, each said each discharge electrode The time change rates (dV ₊ / dt and dV ₋ / dt) of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) given by the high voltage generation circuit are as follows. Of the positive side high voltage (V ₊ ) and the negative side high voltage (V ₋ ) within the minute time, the change amounts (ΔV ₊ , ΔV ₋ ) are ΔV ₊ << V ₊ and ΔV _- «V _- ...... and the high voltage control means for controlling each high voltage generating circuit so as to satisfy the relation (2), both active neutralization current obtained by the effective current difference detection means in said short time Difference between (I ₁₊ , I ₁₋ ) (Ia)
And a differential means for obtaining a temporal change rate (dIa / dt) of the effective static elimination current (I ₁₊ or I ₁₋ ) of both the effective static elimination currents (I ₁₊ , I ₁₋ ) Of the first effective charge removing current detecting means for determining by using the relational expression, the other effective neutralizing current (I _1-or I _1+), and both active neutralization current obtained by the effective current difference detecting means (I _{1 +} , I
₁₋ ) (Ia = I ₁₊ −I ₁₋ ) and the positive side effective static elimination current (I ₁₊ ) or negative side effective static elimination current (I ₁₋ ) obtained by the first effective static elimination current detection means. ) And second effective static elimination current detecting means obtained by subtraction calculation or addition arithmetic operation, and by controlling each effective static elimination current (I ₁₊ , I _1- ) obtained by each effective static elimination current detecting means, A static eliminator that controls generation of positive and negative ions that contribute to static elimination. 9. At least one of the two discharge electrodes
Total discharge current of discharge electrode (I_{S +}Or I _S-) To detect discharge
Current detection means and the total discharge current (I_{S +}or
Is I_S-) To the effective static elimination current (I₁₊Or I_1-) Subtracted
By doing so, the inter-electrode reactive current flowing between the discharge electrodes is
Flow (I₃) For detecting the reactive current between electrodes
The static eliminator according to claim 7 or 8, characterized in that. 10. Each of the high voltage generation circuits generates a high voltage (V ₊ , V ₋ ) corresponding to a positive side high voltage instruction value and a negative side high voltage instruction value given from the high voltage control means. Wherein the high-voltage control means generates the positive-side high-voltage instruction value and the negative-side high-voltage instruction value as substantially constant within a small time including the minute time, and a positive-side instruction value generating means and a negative-side instruction. Value generating means and instruction value processing for repeatedly producing minute fluctuations in the positive side high voltage instruction value or the negative side high voltage instruction value generated by the positive side instruction value generating means or the negative side instruction value generating means at the minute time intervals. Means for providing a positive side high voltage instruction value or a negative side high voltage instruction value, which has caused a minute variation by the instruction value processing means, to a corresponding high voltage generation circuit, and another high voltage instruction value. The negative voltage to the corresponding high voltage generation circuit. 10. The high voltage generating circuits are controlled so as to satisfy the relationship of (1) and (2) by giving from the instruction value generating means or the positive side instruction value generating means. The static eliminator according to any one. 11. The positive side high voltage by the indicated value processing means
A slight change in the pressure indication value or the negative side high voltage indication value is
Positive side high voltage (V in the relational expressions (3) and (4)₊)When
The rate of change dV with time₊Value of ratio with / dt or negative high voltage
Pressure (V_-) And its rate of change dV with time _-Value of ratio with / dt
Is a small exponentially small variation, and the first effective static elimination current detecting means is
If the value of the ratio in the relational expression (4) is set to a constant value,
The temporal change rate (dIa /
dt), the positive side effective static elimination current (I₁₊) Or with negative side
Effective static elimination current (I_1-) Is obtained.
The static eliminator according to item 0. 12. The positive side instruction value generating means and the negative side instruction value generating means generate the positive side high voltage instruction value and the negative side high voltage instruction value as an instruction value signal having a level corresponding to the positive side high voltage instruction value and the negative side high voltage instruction value, respectively. 12. The static eliminator according to claim 11, wherein the instruction value processing means uses a time constant circuit made up of a resistor and a capacitor to cause an exponential minute change in the level of the instruction value signal.