JPH06251892A - Ion generating device - Google Patents

Abstract

PURPOSE:To provide an ion generating device capable of quickly and surely removing static electricity from an object to be subjected to static elimination. CONSTITUTION:An ion generating device has an electrostatic electrometer 40. The electrostatic electrometer 40 measures the polarity of the static electricity charged on the surface of an object A to be subjected to static elimination and the surface potential of the object A corresponding to the charge quantity. A control part 50 controls a power source part 20 on the basis of the signal from the electrostatic electrometer 40. Discharge electrodes 11, 12 receive a high voltage from the power source part, 20 and execute corona discharge to generate ions as neutralizing the static electricity of the object A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for generating ions for removing static electricity.

[0002]

2. Description of the Related Art As disclosed in U.S. Pat. No. 4,809,127, an ion generator includes an emitter bar having a discharge electrode and a power supply section for applying a high voltage to the discharge electrode of the emitter bar. At the tip of the discharge electrode to which a high voltage is applied, corona discharge occurs and the air molecules are ionized. These ions float in the air and remove the static electricity generated on the surface of the static elimination target. That is, among the floating ions, ions having a polarity different from that of the static electricity are combined with the static electricity to neutralize the static electricity.

[0003]

In the above-described ion generator, ions are generated regardless of the charged state of the object to be neutralized, and efficient neutralization has not been performed.

[0004]

The present invention has been made to overcome the above-mentioned problems, and its gist is to provide a discharge electrode and a corona discharge at the discharge electrode by applying a high voltage to the discharge electrode. In an ion generator equipped with a power supply unit that generates ions to generate ions, an electrostatic potential for measuring the surface potential of the static elimination object corresponding to the polarity of the static electricity charged on the surface of the static elimination object and its charge amount. An ion generating device comprising: a meter and a controller that controls the power source unit so as to neutralize the static electricity of the static elimination object based on a signal from the electrostatic electrometer.

[0005]

Since the ions are generated according to the charged state of the static elimination target, the static elimination can be efficiently performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the ion generator includes an emitter bar 10. The emitter bar 10 has two discharge electrodes 11 and 12 respectively connected to mutually independent connectors (not shown). A high positive voltage is periodically applied to one of the discharge electrodes 11 as needed, and positive ions are generated by corona discharge. A negative high voltage is periodically applied to the other discharge electrode 12 as needed, and negative ions are generated by the corona discharge. These discharge electrodes 11 and 12 are connected to the power supply unit 20 via connectors, respectively.

On the other hand, the static elimination object A is placed on the conveyor 30 and conveyed one after another. The conveyor 30 passes through an environment in which the ions generated by the emitter bar 10 are floating. An electrostatic electrometer 40 is arranged above the conveyor 30 at a distance close to the conveyor 30. The electrostatic electrometer 40 measures the potential of the surface of the static elimination object A. This potential represents the polarity of static electricity charged on the surface of the static elimination object A and the static electricity amount (charge amount) per unit area.

A signal representing the potential from the electrostatic electrometer 40 is sent to the control unit 50. The control unit 50 controls the power supply unit 20 according to this potential. More specifically, when the surface of the static elimination object A is charged with positive static electricity and the charged amount is large, a negative high voltage is applied to the discharge electrode 12 in a constant cycle, and the pulse width is increased. To do. When the amount of positive static electricity is small, this pulse width is reduced.
On the contrary, when the surface of the static elimination object A is charged with negative static electricity and the amount of the static electricity is large, a positive high voltage is applied to the discharge electrode 11 in a constant cycle and the pulse width thereof is increased. To increase. When the amount of negative static electricity is small, this pulse width is reduced. In this way, the static electricity of the static elimination object A can be removed efficiently, quickly and surely.

The present invention is not limited to the above-mentioned embodiment and various modes are possible. For example, in the above embodiment,
The discharge electrodes 11 and 12 may be simultaneously applied with a positive high voltage to generate positive ions, and may be simultaneously applied with a negative high voltage to generate negative ions. Further, it is also possible to generate negative ions in the other discharge electrode 12 while generating positive ions in the one discharge electrode 11. In this case, the static elimination target A
The pulse width of the positive high voltage and the pulse width of the negative high voltage are adjusted according to the electrostatic potential of, and the ratio of the amount of positive and negative ions generated is adjusted accordingly. Alternatively, an alternating voltage may be applied to the discharge electrode of the emitter bar. In this case, the ratio of the area of the positive waveform portion and the area of the negative waveform portion in the sine wave is adjusted according to the electrostatic potential of the static elimination target.

[0010]

As described above, according to the present invention, since the ions are generated according to the charged state of the object to be neutralized, it is possible to efficiently, promptly and surely perform the neutralization.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of an ion generator according to the present invention.

[Explanation of Codes] 11, 12 Discharge Electrode 20 Power Supply Section 40 Electrostatic Potential Meter 50 Control Section A Object to be Electrified

Claims (1)

[Claims] 1. An ion generator comprising a discharge electrode and a power supply section for generating corona discharge at the discharge electrode to generate ions by applying a high voltage to the discharge electrode. An electrostatic electrometer that measures the surface potential of the static elimination target corresponding to the polarity of the static electricity charged on the surface and the amount of the static charge, and neutralizes the static electricity of the static elimination target based on the signal from this static electrometer. An ion generator, comprising: a control unit that controls the power supply unit.