JPH077715B2 - DC static eliminator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC static eliminator which applies positive and negative DC high voltages to positive and negative discharge needles to simultaneously generate positive and negative bipolar ions to neutralize a charged object. .

[0002]

2. Description of the Related Art In particular, as a long type static eliminator for arranging a plurality of discharge needles and generating positive and negative ions by corona discharge from each discharge needle, a long type static eliminator has hitherto been used. An AC static charge elimination method in which positive and negative ions are alternately generated by applying an alternating high voltage, the discharge needles are arranged in two rows, and a positive high DC voltage is applied to the discharge needles in one row and the other. In the column of, the plus and minus separate static elimination type that applies a negative DC high voltage, and the pulse DC static elimination type that uses plus and minus high voltage transformers to alternately perform plus and minus discharge by pulse control was there.

[0003]

However, it is difficult to generate positive ions and negative ions at the same level (unbalanced ion polarity) in the AC static elimination type and the plus / minus type static elimination type. The charged object was sometimes reversely charged.

Further, the pulse DC static elimination type is better than the previous two types in terms of ion polarity balance, but
Since the generation cycle of positive and negative ions is slow,
Although it is good to remove static electricity over a wide area over a long period of time like static elimination in a clean room, it is not suitable when static elimination time per unit area needs to be shortened like static elimination of a moving object.

By the way, in the manufacturing process of long thin films such as films and sheets, the traveling speed of films and sheets has been remarkably increased due to the progress of manufacturing technology. Regarding the above, none of the above-mentioned conventional static eliminators was able to cope with the problem that the static elimination unevenness was remarkable.

The object of the present invention is to eliminate static electricity evenly in a charged object traveling at a high speed with less unevenness, and to prevent a short circuit between the discharge needle and the charged object for each discharge needle, and even if only a part of the discharge needle is used. Even if the electric discharge needle of 1 is short-circuited, the other electric discharge needles can maintain their functions as they are.

Another object is to facilitate the production of a rod-shaped or elongated plate-shaped discharge part, and to generate positive ions and negative ions simultaneously and equally,
In some cases, the charged object can be efficiently discharged regardless of whether the charged object has a positive or negative polarity.

[0008]

In the DC static eliminator according to the present invention, the plus electrode lead and the minus electrode lead are arranged side by side on a rod-shaped or long plate-shaped insulating holder, and
A plurality of discharge needles are arranged and fixed at a predetermined interval, and the discharge needles are alternately connected to the plus electrode lead and the minus electrode lead through current limiting resistors and in the plus and minus directions according to the arrangement order. Connect one end of the positive electrode lead and the negative electrode lead to the
Connected to the negative output terminals, respectively, so that a positive DC high voltage and a negative high voltage can be applied simultaneously.

In order to facilitate the production of the discharge part having the insulating holder as the main body, the positive electrode lead and the negative electrode lead are printed and wired in parallel to the printed circuit board, and the discharge needle is implanted in the printed circuit board. Then, the printed circuit board is embedded in a hollow insulating holder with resin, and only a part of the discharge needle is projected from the resin surface.

In order to enable operation with a DC power source such as a battery and to balance the ion polarity, a DC high voltage generator includes a high frequency transformer and a high frequency wave that self-oscillates by a DC voltage applied to the primary side of the high frequency transformer. Oscillation circuit, plus side voltage doubler rectifier circuit connected between the secondary side of the high frequency transformer and the plus side output terminal, and minus side connected between the secondary side of the high frequency transformer and the minus side output terminal The one provided with a double voltage rectifier circuit is used. In this case, the positive-side voltage doubler rectifier circuit is one in which a diode and a capacitor are connected in series in n stages to positively rectify and amplify the secondary-side AC voltage of the high-frequency transformer in n steps. It is assumed that a diode and a capacitor are connected in series in m stages so that the secondary side AC voltage of the high frequency transformer is negatively rectified and amplified in m stages smaller than n.

In order to limit the discharge current to each of plus and minus, a current limiting resistor common to the plus side between the plus side voltage doubler rectifier circuit and the plus side output terminal, the minus voltage doubler rectifier circuit and the minus side A current limiting resistor common to the negative side is provided between each side and the output terminal.

[0012]

In the DC static eliminator of the present invention, the discharge needles having a positive discharge polarity and the discharge needles having a negative discharge polarity are alternately arranged at equal intervals, and since these discharge at the same time, positive and negative ions are generated. Occur at the same time. Since a current limiting resistor is individually connected to each of these discharge needles, the discharge current can be limited individually for each of the discharge needles.

In the DC high voltage generator having the above structure, when a DC voltage is applied to the high frequency oscillating circuit, the high frequency oscillating circuit self-oscillates to obtain an AC voltage on the secondary side of the high frequency transformer. This AC voltage is positively and negatively rectified and amplified by the positive side double voltage rectifier circuit and the negative side double voltage rectifier circuit respectively, and the positive DC high voltage is applied to the positive discharge needle and the negative DC is applied to the negative discharge needle. High voltage is applied.

The number of ions generated by ionization tends to be slightly larger in negative ions than in positive ions, but the number of amplification stages of the positive voltage doubler rectifier circuit is larger than that of the negative voltage multiplier rectifier circuit. Therefore, the DC voltage applied to the plus / minus discharge needle is higher on the plus side, and it is possible to generate positive ions and negative ions equally.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the drawings. This DC static eliminator comprises a DC high voltage generator A whose circuit configuration is shown in FIG. 1 and a rod-shaped discharge part B whose external appearance is shown in FIG. 2, and uses a positive and negative DC high voltage from the DC high voltage generator A as a cable. Discharge part B through C
Can be supplied to.

The DC high-voltage generator A will be described. A power jack 1 for connecting an external DC power source such as an AC / DC adapter, and a battery-on / on battery for the internal battery 2.
An off switch 3 is provided so that an external DC power source and an internal battery 2 can be selectively used as power sources. That is, the battery on / off switch 3 is turned off when a plug from the external DC power supply is inserted into the power supply jack, and is turned on when the plug is not inserted.

A DC voltage from the external DC power source or the internal battery 2 is applied to the high frequency oscillation circuit 7 via the power switch 4, the variable resistor 5 and the fuse 6. The high frequency oscillating circuit 7 is connected to the primary side of the high frequency transformer 8, and when the starting transistor 9 is turned on by the application of the DC voltage, the high frequency oscillating circuit oscillates at a high frequency by self-excited oscillation. When this oscillates, an AC high voltage is obtained on the secondary side of the high frequency transformer 8, and
The light emitting diode 10, which is an operation indicator lamp, lights up.

At the secondary side output terminal of the high frequency transformer 8,
The positive voltage doubler rectifier circuit 11 and the negative voltage doubler rectifier circuit 12 are connected in parallel. The structure and principle of a voltage doubler rectifier circuit is known, and by connecting a diode and a capacitor so as to be stacked in series, a high voltage DC voltage that is a multiple of the secondary voltage of the transformer can be obtained by the number of stacked stages. -It is also called the Walton circuit.

The positive-side voltage doubler rectifier circuit 11 is configured by connecting a diode 13 and a capacitor 14 in n stages (5 stages in the figure) in series in order to positively rectify and amplify the secondary voltage of the high frequency transformer 8 in n stages. The negative side voltage doubler rectifier circuit 12 negatively rectifies and amplifies the secondary voltage of the high frequency transformer 8 into m stages less than n.
And the capacitor 14 are connected in series in m stages (4 stages in the figure).

The output terminal of the plus-side voltage doubler rectifier circuit 11 is
It is connected to the plus side output terminal 17 through a current limiting resistor 15 that is common to the plus side of the discharge section B and is resistance-coupled to the plus side, and the output terminal of the minus side voltage doubler rectifier circuit 12 is the minus side of the discharge section B. It is connected to the negative side output terminal 18 via a current limiting resistor 16 that is commonly used in the negative side and is resistance-coupled to the negative side output terminal 18.

In the above structure, the power switch 4
When the high frequency oscillating circuit 7 is oscillated by turning on, the light emitting diode 10 lights up and an AC voltage is generated on the secondary side of the high frequency transformer 8, and the AC voltage is rectified into five stages in the plus side voltage doubler rectifying circuit 11. And is amplified, and is rectified and amplified in four stages in the negative voltage doubler rectifier circuit 12. Therefore, the voltage output from the plus side output terminal 17 is higher than the voltage output from the minus side output terminal 18. For example, the positive side is 5.6 to 5.9KV,
The minus side is 4.7 to 5.0 KV.

Next, the structure of the discharge part B will be described. The long insulating holder 19 which is also the main body is resin-molded with a C-shaped cross section as shown in FIG. Is forming. This insulation holder 1
An elongated printed circuit board 21 is mounted and fixed by embedding it in a resin 22 in the board 9 as shown in FIGS. 4 and 5.

Referring to FIGS. 4 and 5, the printed circuit board 21
On the surface of the positive electrode lead 2 along both side edges
3 and the negative electrode lead 24 are printed and wired in parallel. Further, on the printed circuit board 21, a small bottomed conductive bush 25 is arranged at a constant interval (for example, 30 to 80 mm) on the center line between the electrode leads 23 and 24 on both sides.
Many are planted in an array. The open end surface of each conductive bush 25 faces the front surface of the printed circuit board 21, but most of it projects from the back surface of the printed circuit board 21.

The conductive bushes 25 thus arranged in a row are connected to the plus electrode lead 23 and the minus electrode lead 24 via the current limiting resistors 26 and alternately in the plus and minus directions according to the arrangement order. . That is, the conductive bushes 25 having an odd arrangement number are alternately changed to the positive electrode lead 23 and the even conductive bushes 25 are changed to the negative electrode lead 24, one at a time and one at each implantation position. Are individually connected via the current limiting resistor 26. In this case, one end of each current limiting resistor 26 has a conductive bush 2 on the surface of the printed board 21 through a through hole provided in the printed board 21.
5 and the other end is similarly positive electrode lead 23
Alternatively, it is connected to the negative electrode lead 24.

After the printed board 21 is constructed as described above, a part of the discharge needles 26 is removably inserted into each of the conductive bushes 25, whereby a large number of the discharge needles 26 are arranged along the center line of the printed board 21. The array is projected at equal intervals. Therefore, the discharge needles 27 are alternately connected to the plus electrode lead 23 and the minus electrode lead 24 via the current limiting resistor 26 and in the plus and minus directions according to the arrangement order.

After mounting the discharge needle 27 as described above, the printed board 21 is inserted at both ends into a connector 28 attached to the base end of the insulating holder 19 and a tip cover 29 attached to the tip thereof as shown in FIG. Is fixed in the insulating holder 19 by embedding it in the resin 22.
Of the resin holder 22 at the center of the opening 20 of the insulating holder 19.

The base ends of the positive electrode lead 23 and the negative electrode lead 24 are connected to the cable C in the connector 28.
Connected to the tip of the positive electrode lead 23, a positive DC high voltage from the positive output terminal 17 of the DC high voltage generator A, and a negative electrode lead 24 a negative DC from the negative output terminal 18. High voltage is applied simultaneously via cable C.

Therefore, when the opening 20 of the insulating holder 19 is directed toward the charged object, positive ions are emitted from the discharge needle 27 connected to the positive electrode lead 23, and negative ions are emitted from the discharge needle 27 connected to the negative electrode lead 24. Ions are simultaneously emitted radially towards the charged object. In this case, the discharge needles 27 alternate positively and negatively at equal intervals (30
-80 mm), it is possible to average the ion density in the static elimination region where the bipolar ions join together in the length direction of the insulating holder 19, and since the ion density does not fluctuate, a long charged object can be obtained. Even if the vehicle is running continuously at high speed, it can be eliminated to the average evenly with less unevenness in the elimination of electricity.

Since the voltage applied to the positive side discharge needle 27 is slightly higher than the voltage applied to the negative side discharge needle 27, positive ions and negative ions are generated equally. Therefore, since the ionic polarity is balanced, the charged object is not charged in the opposite direction, and efficient charge removal can be performed regardless of the charging polarity or the potential. Since positive ions and negative ions are generated separately from distant places, they are not neutralized at the same time as they are generated, the ion generation efficiency is good, and the voltage applied to the discharge needle 27 is low. As a result, ozone is less generated.

Resistors 15.1 connected to the output terminals of the positive and negative voltage doubler rectifier circuits 11 and 12, respectively.
Reference numeral 6 serves as a current limiting resistor common to each of plus and minus with respect to the plus side discharge needle 27 connected to the plus electrode lead 23 and the minus side discharge needle 27 connected to the minus electrode lead 24. When the number of the discharge needles 27 is small, there is no problem even if only the common resistors 15 and 16 are connected, that is, the resistor 26 is not connected to each of the discharge needles 27. If there is not, the sum of the discharge current from each discharge needle 27 for each plus and minus is the resistance 15
.16, it becomes necessary to use large resistors having a large wattage as these resistors 15.16.

Therefore, a resistor 2 is attached to each of the discharge needles 27.
By connecting 6 to limit the discharge current individually, not only can the common resistors 15 and 16 be made smaller, but also a short circuit between the discharge needle 27 and the charged object can be prevented for each discharge needle. Even if some of the discharge needles are short-circuited, the other discharge needles can maintain their functions.

[0032]

The present invention has the following effects. Discharge needles having positive and negative discharge polarities are alternately arranged at equal intervals, and positive and negative ions can be simultaneously generated from these discharge needles, so that ions of both polarities join. The ion density in the static elimination area can be averaged in the length direction of the insulation holder, and the fluctuation of the ion density is small, so even if a long charged object is continuously running at high speed, it is possible to eliminate static electricity evenly in the static elimination evenly. You can

Since a current limiting resistor is individually connected to each of the discharge needles to limit the discharge current for each discharge needle, a short circuit between the discharge needle and the charged object is made to each discharge needle. It is possible to prevent the above, and even if some of the discharge needles are short-circuited, the other discharge needles can maintain their functions as they are.

With the structure as claimed in claim 2, the discharge part can be easily manufactured.

According to a third aspect of the present invention, in the high voltage DC generator, the AC voltage on the secondary side of the high frequency transformer is rectified and amplified by a voltage doubler rectifier circuit consisting of a diode and a capacitor and applied to positive and negative discharge needles. Then, even if a small high-frequency transformer having a small transformation capacity is used, a sufficiently high voltage can be applied to the discharge needle, so that the size can be reduced.

Further, in this claim, the number of amplification stages of the voltage doubler rectifier circuit on the plus side is made larger than that on the minus side so that the DC voltage applied to the discharge needle on the plus side becomes higher than that on the plus side. Therefore, it is possible to generate positive ions and negative ions equally. Therefore,
Since the charged object is not reversely charged and the ionic polarities are balanced, efficient charge removal can be performed regardless of the polarity or potential of the charged object.

By providing a current limiting resistor common to the discharge needle on the plus side and a current limiting resistor common to the discharge needle on the minus side as in claim 4, safety is further enhanced.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of an example of a DC static eliminator according to the present invention.

FIG. 2 is an external perspective view of a discharge part of the DC static eliminator.

FIG. 3 is an enlarged sectional view of the discharge part.

FIG. 4 is a side view of a part of the printed circuit board in the discharge part.

FIG. 5 is a partially cutaway perspective view of the above.

[Explanation of symbols]

 A DC high-voltage generator B Discharge unit 7 High-frequency oscillator circuit 8 High-frequency transformer 11 Plus-side voltage doubler rectifier circuit 12 Negative-side voltage doubler rectifier circuit 13 Diode 14 Capacitor 15 Positive-side common current limiting resistor 16 Negative-side common current limiting Resistance 17 Positive side output terminal 18 Negative side output terminal 19 Insulation holder 21 Printed circuit board 22 Resin 23 Positive electrode lead 24 Negative electrode lead 26 Current limiting resistor 27 Discharge needle

Claims (4)

[Claims] 1. A positive electrode lead 23 and a negative electrode lead 24 are arranged side by side on an insulating holder 19 in the shape of a rod or a long plate, and a plurality of discharge needles 27 are arranged and fixed at predetermined intervals. 27 are alternately connected to the plus electrode lead 23 and the minus electrode lead 24 via the current limiting resistor 26 and according to the arrangement order, and one end of the plus electrode lead 23 and the minus electrode lead 24 is subjected to high DC voltage generation. Device A Plus
A DC static eliminator characterized by being connected to the negative output terminals 17 and 18, respectively. 2. The positive electrode lead 23 and the negative electrode lead 24 are printed in parallel with the printed circuit board 21, and the discharge needle 27 is planted in the printed circuit board 21 to make the insulating holder 19 hollow. The DC static eliminator according to claim 1, wherein the printed circuit board 21 is embedded in the resin, and only a part of the discharge needle 27 is projected from the resin surface. 3. The high-voltage DC generator A comprises a high-frequency transformer 8, a high-frequency oscillating circuit 7 that oscillates by self-excitation by a DC voltage applied to the primary side of the high-frequency transformer 8, and a secondary side of the high-frequency transformer 8. And a plus side voltage doubler rectifier circuit 11 connected between the positive side output terminal 17 and a negative side voltage doubler rectifier circuit 12 connected between the secondary side of the high frequency transformer 8 and the negative side output terminal 18. The positive-side voltage doubler rectifier circuit 11 is configured by connecting a diode 13 and a capacitor 14 in n stages in series to positively rectify and amplify the secondary-side AC voltage of the high-frequency transformer 8 in n stages. The minus-side voltage doubler rectifier circuit 12 connects the secondary-side AC voltage of the high-frequency transformer 8 in minus stages by amplifying the diode 13 and the capacitor 14 in m stages in order to rectify and amplify the m-stages. DC static eliminator according to claim 1, characterized in that it is configured continue to. 4. A current limiting resistor 15 common to the plus side between the plus side voltage doubler rectifier circuit 11 and the plus side output terminal 17, the minus voltage doubler rectifier circuit 12 and the minus side output terminal 18. 4. A current limiting resistor 16 common to the negative side is provided between them.
DC static eliminator described in.