JP4499493B2 - Ion balance sensor and static eliminator with ion balance sensor - Google Patents

Description

  The present invention relates to an ion balance sensor and a static eliminator including the ion balance sensor.

  The conventional ion balance measurement sensor (ion balance sensor) of a static eliminator is a simple linear rod-shaped conductor or circular rod-shaped conductor placed in front of the discharge needle so as to follow the arrangement of the discharge needle (ion emission electrode). The sensor is placed or placed in front of the discharge needle with a mesh of conductors. These sensors measure the ion balance by receiving the emitted ions.

  The problem with this conventional method is that since the sensor is close to the discharge electrode, it is strongly affected by the voltage of the discharge needle, that is, the electric field of several KV to several tens of KV, and noise is also picked up. A very fine ion current signal of about μA to be measured is buried in noise, so-called S / N ratio (signal / noise ratio) is deteriorated, and accurate measurement is difficult. As a result, it was difficult to realize a highly accurate static eliminator.

  Accordingly, an object of the present invention is to provide an ion balance sensor having a good S / N ratio and a static eliminator including the ion balance sensor.

  In order to solve the above problems, the present invention comprises a conductor having one insulating coating and a conductor having no other insulating coating, and these two conductors are twisted together. An ion balance sensor characterized by the above is adopted.

  The present invention also includes an ion emission electrode and an ion balance sensor disposed in a region of ions emitted from the ion emission electrode. The ion balance sensor includes a conductor having one insulating coating, and another one. A static eliminator equipped with an ion balance sensor, characterized in that it consists of a conductor having no insulation coating and is a twist of these two conductors.

  According to the present invention, the ion balance sensor can cancel the influence of an electric field and external noise, so that an ion balance sensor having a good S / N ratio and a static eliminator including the ion balance sensor can be obtained.

  The ion balance sensor of the present invention comprises a conductor having one insulating coating and a conductor having no other insulating coating, and these two conductors are twisted together.

  The static eliminator provided with the ion balance sensor of the present invention comprises an ion emission electrode and an ion balance sensor arranged in a region of ions emitted from the ion emission electrode. The ion balance sensor is composed of a conductor having one insulating coating and another conductor having no insulating coating, and these two conductors are twisted together.

  FIG. 1 is a perspective view showing an ion balance sensor according to a first embodiment of the present invention. In FIG. 1, an ion balance sensor 10 uses two stranded wires as electrodes. One of them is a conductor 14 covered with an insulating coating. The other is a conductor 12 that is not covered with an insulating coating.

  If the ion balance sensor 10 is arranged in the ion region of the static eliminator, the two strand wire electrodes 12 and 14 are equally affected by noise due to the electric field of the discharge needle (ion emission electrode) of the static eliminator and various external noises. It can be canceled out by differential amplification. On the other hand, ion current detection due to deviation in ion balance is performed only with electrodes not covered with an insulating coating. Since the ionic current cannot flow through the electrode covered with the other insulating coating, the ionic current cannot be detected.

  That is, the conductor 12 measures the total value of the electric field and the ion current, and the conductor 14 measures only the electric field. By calculating the difference between these measured values, only the ionic current can be calculated.

  In this way, noise (mainly based on the electric field) is obtained by differentially amplifying the signals of two identically stranded electrodes such as the physical shape and the place where they are placed, that is, the distance and relative position from the noise source. Thus, a signal with a good S / N ratio can be obtained. As a result, even a slight deviation in ion balance can be detected stably without being influenced by the surrounding environment, so that a highly accurate and stable sensor can be realized. realizable.

  FIG. 2 is a perspective view of the static eliminator of Example 2 including the ion balance sensor of Example 1. FIG. In FIG. 2, the static eliminator 20 has a plurality of discharge needles (ion emission electrodes) 22 arranged in a circle on the front surface. Ions 30 are emitted from the discharge needle 22. A cylindrical gripping member 24 is disposed at the center of the plurality of discharge needles 22 in the basin from which these ions are released. The ion balance sensor 10 is detachably attached to the grip member 24 (as indicated by an arrow).

FIG. 3 is a perspective view of the static eliminator of Example 3 including the ion balance sensor of Example 1. FIG.
In FIG. 3, a static eliminator (bar type static eliminator) 40 has a plurality of discharge needles 22 arranged in a straight line on the front surface. Ions 30 are emitted from the discharge needle 22. The ion balance sensor 10 is attached to gripping members 42 and 44 disposed at both ends of the static eliminator 40 in front of the plurality of discharge needles 22 in the basin from which these ions are discharged. The ion balance sensor 10 is detachably attached to the grip members 42 and 44 so as to be linearly movable (as indicated by arrows).

  As shown in the enlarged view of FIG. 3a, a spring 46 is disposed inside one gripping member 44 via a connector 48, and the ion balance sensor 10 is gripped by the static eliminator body via this spring 46. Has been. As a result, even if a person touches the ion balance sensor 10, the spring 46 extends and responds, so that it is possible to prevent the ion balance sensor from being deformed such as stretching or slackening, and stable measurement can be performed constantly. enable.

  Further, as shown in the enlarged view of FIG. 3b, the ion balance sensor 10 is connected to the static eliminator body via the connector 48 inside the gripping member 42.

  The emitted ions oxidize or deposit dirt on the electrode of the ion balance sensor. The effect varies depending on the polarity of the electrode. For example, if the sensor electrode in front of the negative electrode is oxidized or soiled, it will appear that negative ions have decreased, resulting in a measurement error. To correct this, the error can be compensated by moving the ion balance sensor from the negative electrode to the positive electrode. This means is also effective by moving it in a circular type (FIG. 2) or a linear type (FIG. 3), such as rotation, linear movement, or left / right reversal (exchange connectors at both ends of the ion balance sensor).

  In addition, since the ion balance sensor is contaminated, oxidized, and worn out, it is preferable to clean the ion balance sensor every time. However, it is convenient to be able to remove it from the static eliminator because it must be replaced after a long period of use.

It is a perspective view of the ion balance sensor of Example 1 of this invention. It is a perspective view of the static eliminator of Example 2 of this invention. It is a perspective view of the static eliminator of Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ion balance sensor 12 Conductor without insulation coating 14 Conductor covered with insulation coating 20 Static eliminator 22 Discharge needle 40 Static eliminator

Claims (7)

  An ion balance sensor comprising a conductor having one insulation coating and a conductor having no other insulation coating, the two conductors being twisted together. An ion emission electrode;
An ion balance sensor disposed in a region of ions emitted from the ion emission electrode;
The ion balance sensor is composed of a conductor having one insulation coating and a conductor having no other insulation coating, and these two conductors are twisted together.
A static eliminator equipped with an ion balance sensor.   3. The static eliminator according to claim 2, wherein the plurality of ion emission electrodes are arranged in a circular shape, and the ion balance sensor is arranged at a central portion of the plurality of ion emission electrodes.   The static eliminator according to claim 3, wherein the ion balance sensor is movably and detachably disposed.   3. The static eliminator according to claim 2, wherein a plurality of ion emission electrodes are linearly arranged, and the ion balance sensor is linearly arranged in front of the plurality of ion emission electrodes.   6. The static eliminator according to claim 5, wherein the ion balance sensor is movably and detachably disposed.   The static eliminator according to claim 5 or 6, wherein at least one end of the ion balance sensor is held by the static eliminator main body via a spring.