JP3041782B2 - Static elimination method and static elimination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static elimination method and a static elimination apparatus in which positive and negative ions are ion-balanced.

[0002]

2. Description of the Related Art Conventionally, as a method for achieving ion balance of positive and negative ions in order to improve static elimination properties, for example,
As disclosed in Japanese Utility Model Publication No. 7-4797, in a DC static eliminator, by changing the number of stages of a positive / negative voltage doubler rectifier circuit between a positive side and a negative side,
One that gives a difference between the positive high voltage applied to the positive-side discharge electrode and the negative high voltage applied to the negative-side discharge electrode. As disclosed in JP-A-7-249497, in an AC static eliminator, Adjusting the balance between the level of the primary current and the positive / negative voltage of the step-up transformer. As disclosed in JP-A-9-97700, in an AC static eliminator, the negative peak value of the primary side of the step-up transformer is kept constant. A proposal has been made to cut the supply of the primary current to the step-up transformer during the period longer than the level to reduce the negative peak value of the current on the secondary side by an appropriate amount.

[0003]

SUMMARY OF THE INVENTION These prior arts are:
In both cases, by changing the voltage applied to the discharge electrode, it is intended that the generated positive and negative ions are equal, but the amount of generated positive and negative ions depends only on the discharge applied voltage. However, since the voltage varies depending on the ambient conditions and the like, the fact that the discharge application voltage is adjusted does not necessarily mean that the object to be neutralized (charged body) is actually irradiated with the same amount of positive and negative ions.

In addition, the object to be neutralized is often complicatedly charged in both positive and negative polarities, and is partially in a state where either the positive or negative potential is high. Even with the same amount of irradiation, when viewed partially, it results in excessive irradiation of ions that are more than the amount required for static elimination of that portion, and even though the entire object to be neutralized seems to have been neutralized, In many cases, uneven charge removal or reverse charging is caused.

[0005] Further, there is a problem that excess ions not used for neutralization of the object to be neutralized charge the periphery other than the object to be neutralized.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a power supply for applying a high voltage to a discharge electrode, without taking special measures for ion balance, from the viewpoint of an object to be neutralized. This has the same effect as irradiating positive and negative ions while maintaining ion balance.It also easily prevents unnecessary excessive ion irradiation, reduces uneven static elimination, and charges the periphery with excess ions. It is also to provide a static elimination method and a static elimination device which can easily prevent the static elimination.

[0007]

According to the present invention, a static elimination method according to the present invention blows air from behind a discharge electrode to forcibly blow positive and negative ions generated by the discharge by the discharge electrode forward to reduce grounding or bias. The object to be neutralized is applied through the applied mesh electrode.

The static eliminator according to the present invention comprises a discharge electrode for generating positive and negative ions, a mesh electrode arranged in front of the discharge electrode, and a grounded mesh electrode; And a fan that blows out to the mesh electrode side. The mesh electrode may be biased without being grounded.

[0009]

Embodiments of the present invention will be described below.

In FIG. 1, a multi-needle or saw-tooth discharge electrode 2 is supported on an electrode holder 1, and a discharge ground electrode 3 is disposed in front of the discharge electrode 2 with a predetermined interval A therebetween. A mesh-shaped electrode 4 is arranged at an interval B (A <B) larger than an interval A at the front, and a fan 5 is arranged at the rear of the electrode holder 1. Discharge ground electrode 3
Is a plate-shaped, rod-shaped or linear metal conductor, which is grounded. The mesh electrode 4 is a metal net, which is also grounded.

An AC high voltage or a positive / negative DC high voltage is applied to the discharge electrode 2 from a high voltage power supply held in the electrode holder 1 or an external high voltage power supply. Positive and negative ions are generated. The ions generated at this time do not need to be equal in positive and negative amounts.

The generated positive and negative ions pass through the mesh of the mesh electrode 4 together with the air by the blowing of the fan 5. At this time, some ions are absorbed by the meshed electrode 4 which is grounded.
It passes through the mesh of the mesh-shaped electrodes 4 and is sprayed along with the air onto the object to be neutralized (charged body) 6, and is attracted by the charged object 6 having a different polarity to remove electricity.

Some of the ions that pass through the mesh electrode 4 and float between the electrode 6 and the object 6 are also absorbed by the mesh electrode 4. The ions absorbed after the passage and the ions absorbed during the passage are excessive ions for the charge removal target 6, and therefore only ions necessary for charge removal of the charged portion of the charge removal target 6 are included in the charge removal target 6. And a neutralization reaction. In this case, since the electrode 4 is in the form of a mesh having a two-dimensional spread, the amount of ions absorbed by the electrode 4 is partially different depending on a partial difference in the charging potential of the object 6 to be neutralized. The positive and negative ions acting on the charge removal of the charge removal target object 6 have a positive / negative ion balance between the charge of the charge removal target object 6 itself and naturally (depending on the charging state). become. As a result, regardless of the original charging state, the object 6 to be neutralized is neatly erased evenly and without reverse charging.

In the above example, the mesh electrode 4 is grounded. However, for example, when the charging polarity and potential of the object 6 to be neutralized are known in advance or detected, the mesh electrode 4 is grounded. It is effective to apply a bias to

[0015]

As described above, according to the present invention, positive and negative ions generated by the discharge by the discharge electrode are forcibly blown forward by blowing air from the rear of the discharge electrode to be grounded or biased. Since the ion is applied to the object to be neutralized through the mesh electrode, excess ions can be absorbed by the mesh electrode in accordance with the charging state of the object. as a result,
Positive and negative ions that act on the static elimination of the charged static elimination target are partially and naturally balanced between the positive and negative ions with the charge of the static elimination target itself. Irrespective of the original charging state, the charge can be neatly removed without unevenness and without reverse charging.

Further, the problem that excessive ions not used for neutralizing the object to be neutralized charge the periphery other than the object to be neutralized is also solved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode holder 2 Discharge electrode 3 Ground electrode for discharge 4 Mesh electrode 5 Fan 6 Object to be neutralized

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-208898 (JP, A) JP-A-9-38524 (JP, A) JP-A-51-123593 (JP, A) JP-A-54-1984 12847 (JP, A) JP-A-59-193158 (JP, A) JP-A-7-104553 (JP, A) JP-A-8-288094 (JP, A) Japanese Utility Model Laid-Open No. 62-142058 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H05F 3/04

Claims (4)

(57) [Claims] 1. A method according to claim 1, wherein air is blown from behind the discharge electrode to positively and negatively generate positive and negative ions generated by the discharge by the discharge electrode, and strike the object to be neutralized through a grounded mesh electrode. Static elimination method. 2. The air is blown from behind the discharge electrode, and positive and negative ions generated by the discharge by the discharge electrode are forcibly blown forward and applied to the object to be neutralized through the biased mesh electrode. A static elimination method characterized by the above-mentioned. 3. A discharge electrode for generating positive and negative ions, a mesh electrode arranged in front thereof and grounded, and a positive and negative ion blown from the rear of the discharge electrode to the mesh electrode side together with air. A static eliminator comprising: a blower fan. 4. A discharge electrode for generating positive and negative ions, a mesh-shaped electrode disposed in front of the discharge electrode, and a biased mesh electrode; A static eliminator comprising: a fan that blows out to the side.