JP2725170B2 - De-charging electrode - 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 electrode for eliminating or charging an object (including a gas) by applying a high DC or AC voltage to an electrode needle.

[0002]

2. Description of the Related Art As described in Japanese Patent Application Laid-Open No. Hei 4-163898, the present applicant uses a printed circuit board as a support for electrode needles, and applies a voltage to the electrode needles by capacitive coupling to secure capacitance. Has already been provided. The charge-eliminating electrode has a plurality of dielectric cores on which electrode needles are implanted, fitted into a plurality of through holes connected to each other on a printed circuit board, and each electrode needle is capacitively coupled to a wiring pattern by the dielectric core. It was done.

[0003]

However, according to this, a ceramic dielectric core is prepared for each electrode needle,
Since the electrode needles are implanted one by one in the dielectric core and the dielectric cores are fitted in the through holes, the same number of dielectric cores as the electrode needles is required, the number of parts is large, assembly is troublesome, and The thickness of the printed circuit board is increased because the thickness of the printed circuit board is reduced because the thickness of the dielectric core increases and the distance between the electrode needles cannot be reduced, and the size of the through hole also increases and the strength of the printed circuit board decreases. I needed to.

[0004] An object of the present invention is to provide an electrode needle that can be capacitively coupled with a wiring pattern on a printed circuit board without using a separate component for capacitive coupling such as a derivative core, and that a through hole can be reduced. An object of the present invention is to provide a charge-eliminating electrode capable of reducing the number of parts, improving the assembling workability, reducing the size and cost, reducing the distance between electrode needles, securing the strength of a printed circuit board, and reducing the thickness.

[0005]

According to the present invention, there is provided a charge removing electrode in which a plurality of electrode needles are arranged at intervals on a printed circuit board, and a voltage is applied to all of the plurality of electrode needles.
Make sure that the wiring patterns to be added
One side of the printed circuit board so that it does not
The tip of each electrode needle formed in contact with each electrode needle
Separated from each other on the opposite side of the printed circuit board.
By forming at intervals on the surface of each electrode needle,
Wiring pattern via printed circuit board by each chip pattern
This is electrically capacitively coupled to the ground.

[0006] Capacitive coupling with a wiring pattern can be achieved only by press-fitting the base end of each electrode needle into a through hole provided on a printed circuit board. If a wiring pattern is missing around each through hole and each chip pattern is formed facing a portion that is not missing, a necessary capacitance can be sufficiently secured while avoiding interference between electrode needles. Proximal end of electrode needle
And the printed circuit board and the wiring patterns and chips on both sides.
By embedding the backup pattern in the resin, the insulation of both sides of the printed circuit board can be ensured.

[0007]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 shows the front side of the printed circuit board, and FIG.
4 shows the back side, and FIG. 4 shows the cross-sectional structure. As shown in these figures, a large number of small through holes 2 are provided in a line at equal intervals on a belt-shaped printed board 1 made of a hard resin. On the back surface of the printed board 1, a wiring pattern 3 slightly thinner than the width thereof is formed by one continuous metal foil. The wiring pattern 3 lacks a circular shape around each through hole 2, thereby forming a large number of cutouts 4 surrounding each through hole 2 in a circular shape.

On the other hand, a large number of chip patterns 5 made of metal foil chips
Each is formed. As shown in FIG. 5, these chip patterns 5 are formed at equal intervals so as to exclude portions facing the respective notches 4 of the wiring pattern 3 and are separated from each other, and have a drum-shaped planar shape. I have. Each chip pattern 5 has a thin extension 6, and the tip 7 of the extension 6 extends from the inner periphery of each through hole 2 to the back surface of the printed circuit board 1 to border a small edge of each through hole 2. Has become.

The base end of the electrode needle 8 is press-fitted into each through hole 2. In this case, for example, assuming that the inner diameter of the through hole 2 is 0.8 mm, the outer diameter of the electrode needle 8 is slightly larger than 0.9 mm, and the base end of the electrode needle 8 is simply forcibly pressed into the through hole 2. . As a result, each electrode needle 8 is electrically connected to each chip pattern 5 in the through hole 2, and all the electrode needles 8 are connected to the printed circuit board 1.
Protruding at right angles from the surface, and are arranged in a line at equal intervals.

Since the wiring pattern 3 is common to all of the chip patterns 5, when the wiring pattern 3 is connected to a power source and a high voltage is applied, the printed pattern between the wiring pattern 3 and each chip pattern 5 is printed. A capacitance is generated for each of the electrode needles 8 using the relative dielectric constant of 1, and all the electrode needles 8 are simultaneously applied with a high voltage by capacitive coupling with the wiring pattern 3.

In general, the basic formula of a flat capacitor is C
= 0.088 · ε · E / t · 10 (pF). Here, 0.088 is the dielectric constant in a vacuum, ε is the relative dielectric constant of the dielectric, and t is the thickness of the dielectric. Therefore, by securing the opposing area E between the wiring patterns 3 provided on both sides of the printed board 1 and the chip patterns 5, it is possible to obtain a capacitance corresponding to the area for each electrode needle 8.

In the present example, the above-described printed circuit board 1 having an electrode needle 8 implanted in the through hole 2 is provided on the grounding body 9 having a U-shaped cross section as shown in FIG.
It is made by burying it inside. A part of all the electrode needles 8 protrudes from the surface of the resin 10 and is arranged in a line with a predetermined interval from an earth electrode portion 11 having both side edges of the earth body 9 bent. Discharge between and.

In the above example, the printed circuit board 1 is band-shaped and the electrode needles 8 are implanted in a single line. However, the printed circuit board 1 can have any shape such as a square or a circle, and the electrode needles 8 are arranged in a plurality of rows. You can also.

[0014]

As described above, according to the present invention, a chip pattern for each electrode needle is formed on a printed circuit board,
Conventionally, each electrode needle was capacitively coupled to the wiring pattern by securing the capacitance corresponding to the area of each chip pattern with the common wiring pattern on the opposite side. As compared with the non-electrostatic electrode, the number of parts can be reduced, the workability of assembling can be improved, the size and the price can be reduced, and the distance between electrode needles can be reduced.

According to the second aspect, since the electrode needle is directly implanted in the through hole, the through hole can be reduced, and the strength and the thickness of the printed circuit board can be secured.

According to the third aspect of the present invention, the wiring pattern is absent around each through hole, and each chip pattern is formed so as to oppose a portion which is not absent. A sufficient electric capacity can be secured. Further, the wiring pattern and the chip pattern can be formed only where they are effective to save the material.

According to the fourth aspect, the printed board is buried in the resin while leaving a part of the electrode needles, so that the insulation around the printed board can be ensured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of a charge removing electrode according to the present invention.

FIG. 2 is a plan view showing a front side of a printed circuit board in the charge removing electrode.

FIG. 3 is a plan view showing the back side of the printed circuit board.

FIG. 4 is a sectional view mainly showing a printed circuit board;

FIG. 5 is a perspective view showing a relationship between a wiring pattern and a chip pattern provided on a back surface and a front surface of a printed circuit board, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 Through hole 3 Wiring pattern 4 Notch 5 Chip pattern 8 Electrode needle 10 Resin

Claims (4)

(57) [Claims] 1. A dividing charging electrode at a distance a plurality of electrode needles on a printed circuit board arranged, all of the plurality of electrode needle
Wiring patterns for applying voltage to
To prevent contact with each electrode needle
Formed on one side of the lint substrate and contacted with each electrode needle
The tip pattern for each electrode needle is separated from each other
Form at intervals on the opposite side of the printed circuit board
The electrode needles with each tip pattern.
A decharging electrode electrically coupled to the wiring pattern via a printed circuit board . 2. The method according to claim 1, wherein a base end of each electrode needle is press-fitted into a through hole provided on a printed circuit board.
3. The electrode according to 1. 3. The charge removing electrode according to claim 2, wherein a wiring pattern is absent around each through hole, and each chip pattern is formed so as to face a portion which is not absent. 4. A base portion of an electrode needle, a printed circuit board,
4. The charge removing electrode according to claim 1 , wherein the wiring pattern and the chip pattern on both surfaces are embedded in the resin.