JP2008159272A5 - - Google Patents

Claims (14)

A static elimination device that generates ions by applying a high voltage to an electrode needle,
A self-discharge detection circuit that detects self-discharge of the electrode needle when a high voltage is not applied to the electrode needle;
When the self-discharge detection circuit detects self-discharge of the electrode needle during the pause period including a pause period in which the electrode needle is paused, ions are generated by applying a high voltage to the electrode needle. A static eliminator which starts a static elimination operation and stops the static elimination operation when the neutralization of a charged body is completed, and returns to the idle period. The static eliminator according to claim 1, wherein the self-discharge detection circuit includes a circuit that detects a value of a current flowing through the resistor by providing a resistor between the electrode needle and the high voltage generation circuit. 2. The static eliminator according to claim 1, wherein the self-discharge detection circuit includes a circuit that detects a value of a current flowing through the resistor by providing a resistor between the electrode needle and the ground. The static elimination apparatus according to claim 2 or 3, wherein the static elimination operation is started when an absolute value of a current value flowing through the resistor exceeds a first threshold value. The static elimination operation is stopped when the absolute value flowing through the resistor falls below a second threshold value, and returns to the pause period in which the electrode needle is paused. The static elimination apparatus of description. The static elimination apparatus according to any one of claims 1 to 5, wherein the static elimination operation is stopped after a predetermined time has elapsed since the static elimination operation is started, and returns to the pause period in which the electrode needle is paused. A peak value detecting means for detecting a peak value of the current flowing through the resistor;
The predetermined time is adjusted by the magnitude of the absolute value of the peak value detected by the peak value detecting means,
The predetermined time is extended when the absolute value of the peak value is large compared to when it is small, and the predetermined time is shortened when compared with a large value when the absolute value of the peak value is small. Static eliminator. A peak value detecting means for detecting a peak value of an absolute value of a current flowing through the resistor;
The current flowing through the resistor has a current value lowering speed detecting means for detecting the speed at which the peak value decreases when the absolute value of the peak value decreases,
The predetermined time is adjusted according to the decrease rate of the absolute value of the current detected by the current value decrease rate detection means,
The predetermined time is extended when the rate of decrease of the absolute value of the current is small compared to when the rate of decrease of the absolute value is small, and the predetermined time is shortened when the rate of decrease of the absolute value of current is large. The static eliminator described in 1. In the pause mode, when returning to the rest period after the charge elimination operation of applying a high voltage to the electrode needle is performed, gradually reducing the value of the voltage applied to the electrode needle of claim 1-8 The static elimination apparatus as described in any one of Claims. In the pause mode, in performing the charge removing operation of applying a high voltage to the electrode needle from the rest period is increased gradually the value of the voltage applied to the electrode needle, any one of the claims 1-9 The static eliminator described in the paragraph. The pause mode includes the pause period and an ion generation period in which ions are generated by applying a high voltage to the electrode needle, the ion generation period being set at a predetermined interval, and the electrode in the pause period needle is paused, then the high voltage is applied to the electrode needles ion generation period generating ions, then the cycle which the electrode needle pause period is paused is executed, according to claim 1-10 The static elimination apparatus as described in any one of Claims. 12. The static eliminator according to claim 11 , wherein in the pause mode, a value of a voltage applied to the electrode needle is gradually decreased when the ion generation period is shifted to the pause period. 13. The static eliminator according to claim 11 or 12 , wherein in the pause mode, a value of a voltage to be applied to the electrode needle is gradually increased when shifting from the pause period to the ion generation period. In addition to the dormant mode, and a charge removing mode for generating ions by applying a high voltage to the needle electrode, and該除conductive mode and the dormant mode can be selectively set, claim 1-13 The static elimination apparatus as described in any one of.