JP2006073443A - Bar type static eliminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bar type static eliminator with a good ion balance at both sides. <P>SOLUTION: In the bar type static eliminator provided with a plurality of discharge needles arranged so as to alternately irradiate positive and negative ions by way of positions, impression voltage on the discharge needles at both ends is made lower than that on the discharge needle at the center to improve an ion balance distribution. From steps on the way of a multi-step voltage doubler rectifying circuit generating the impression voltage on the discharge needle at the center, a lower voltage is drawn out to make an impression voltage on the discharge needles at the both ends. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bar-type static eliminator, and more particularly to a bar-type static eliminator having a good ion balance.

  Conventional DC bar type static eliminators tend to disturb the ion balance at both ends. For example, when the discharge needle at the left end generates + ions, the ion balance at the left end tends to be +, and when the discharge needle at the right end generates − ions, the ion balance at the right end tends to be −.

  The reason will be described with reference to FIG. FIG. 3a shows the configuration of the ion generator (bar) of the vertical static eliminator. As shown in FIG. 3 a, for example, eight discharge needles indicated by 1 to 8 are arranged on the circuit board 10. A high voltage of + is applied to the left end, a high voltage of different polarity is applied, such as-next, + next, and +, and a high voltage of-is applied to the last right end.

  FIG. 3b shows + and − ion distributions emitted from each discharge needle. The vertical axis represents the ion balance, and the horizontal axis represents the bar position. The high voltages applied to the discharge needles are all of the same voltage (in the example, 5 KV) although the polarities are different. Therefore, the same amount of + and − ions are radiated from each discharge needle side by side alternately.

  FIG. 3c shows the composite value of ion balance. In the center, the amount of + and-ions is equal to 0, so the left end (discharge needle 1 side) has a large amount of + ions, so the ion balance is biased toward +, and the right end (discharge needle 8 side) is Since the amount of − ions is large, the ion balance is biased toward −.

  In the electronics field, when using a static eliminator, it may be necessary to have a good ion balance. In that case, mainly use the central part of the ion generator (bar) with a good ion balance and do not use both ends. It was like that. Therefore, since both sides are actually required for the length of the static elimination object, space is wasted.

  Accordingly, an object of the present invention is to provide a bar-type static eliminator having good ion balance on both sides.

  The present invention relates to a bar-type static eliminator having a plurality of discharge needles arranged so as to alternately emit + and − ions. The voltage applied to the discharge needles at both ends is lower than the voltage applied to the central discharge needle. Thus, the ion balance distribution is improved.

  According to the present invention, a bar type static eliminator with good ion balance on both sides can be obtained.

  In the present invention, in a bar type static eliminator having a plurality of discharge needles arranged so as to alternately emit + and − ions, the voltage applied to the discharge needles at both ends is lower than the voltage applied to the central discharge needle. And improve the ion balance distribution.

  FIG. 1 is a diagram for explaining a bar-type static eliminator according to an embodiment of the present invention. FIG. 1a shows a configuration of an ion generation unit (bar) of the bar-type static eliminator. In FIG. 1 a, eight discharge needles 1 to 8 are arranged. A high voltage of + is applied to the left end, a high voltage of different polarity is applied, such as-next, + next, and +, and a high voltage of-is applied to the last right end. The positive high voltage at the left end and the negative high voltage at the right end are set to voltages lower than the applied voltage of the discharge needle at the center. In the example, both ends are ± 3 KV and the center is ± 5 KV.

  FIG. 1b shows the distribution of 10 and − ions emitted from each discharge needle. The vertical axis represents the ion balance, and the horizontal axis represents the bar position. The high voltage in the central part is the same voltage although the polarities are different. Therefore, the same amount of + and − ions are emitted alternately from each discharge needle. Since the high voltage at both ends is set lower than the central portion, the amount of ions at both ends is small.

  FIG. 1c shows the composite value of ion balance. Since the ion amount of + and − is equal in the central portion, it becomes 0, and the left end (discharge needle 1 side) suppresses the voltage applied to the discharge needle 1 and the amount of + ions is halved, so the discharge needle 2 The ion balance becomes almost zero. Similarly, the right end (on the discharge needle 8 side) suppresses the voltage applied to the discharge needle 8 and the amount of one ion is about halved, so that it balances with + ions of the discharge needle 7 and the ion balance becomes almost zero. . In this way, the ion balance of the entire bar becomes almost zero, and a bar type static eliminator with a good ion balance is obtained over the entire area.

  FIG. 2 shows a high voltage generating circuit which is preferable to be applied to the present invention. In FIG. 2, a slightly low high voltage for both ends is drawn from the middle stage of a multistage voltage doubler rectifier circuit that draws from the oscillator 16 and produces a high voltage at the center.

  With this method, for example, the ion balance is shifted by 5% in the + direction. Therefore, when it is necessary to lower the high voltage of + 5% over the entire area, for example, the output of the oscillator 16 is lowered and the central voltage (+5 KV) is decreased by 5%. As the voltage at both ends (+ 3KV) decreases at the same time by 5%, the central part and both ends fluctuate at the same ratio, so the ratio of the original ion amount of both does not collapse, that is, between the bar parts The advantage is that the ratio relationship of the amount of ions does not collapse. As described above, the control of the ion balance is facilitated because it is only necessary to control the voltage without considering the fluctuation of the ion balance distribution between the parts.

It is a figure for demonstrating the bar-type static eliminator of the Example of this invention. It is a figure which shows the generation circuit of a high voltage preferable to apply to the bar type static eliminator of this invention. It is a figure for demonstrating the bar type static eliminator of a prior art example.

Explanation of symbols

1-8 Discharge needle 10 Substrate 14 Ion 16 Oscillator

Claims (2)

  In a bar-type static eliminator having a plurality of discharge needles arranged so that + and-ions are emitted alternately in position, the applied voltage to the discharge needles at both ends is made lower than the applied voltage to the central discharge needle. A vertical static eliminator with improved ion balance distribution.   2. The vertical static eliminator according to claim 1, wherein a lower voltage is drawn from an intermediate stage of a multi-stage voltage doubler rectifier circuit that generates an applied voltage to a central discharge needle to create an applied voltage to the discharge needles at both ends. The bar-type static eliminator according to claim 1, wherein