JP4842151B2 - Static eliminator - Google Patents

Description

  The present invention relates to a static eliminator.

The static eliminator alternately generates positive and negative ions by applying an AC high voltage between the discharge needle (discharge electrode) and the counter electrode (ground electrode) to cause corona discharge, and these positive and negative ions are charged by static electricity. The neutralization target is electrically neutralized by spraying on the neutralization target such as an integrated circuit. For example, in the static eliminator described in Patent Document 1, an ion emission port is formed on the side wall on the side from which ions are emitted, and ions are emitted by being placed on the air emitted from the ion emission port.
JP 2005-294004 A

  By the way, in the static elimination apparatus of the said patent document 1, since the diameter of an ion discharge | release opening is small, since ion is sprayed on the side wall by the side of ion discharge | release, the number of the ions supplied to a static elimination object reduces, and static elimination performance There was a problem that decreased. Therefore, it is conceivable to increase the diameter of the ion emission port. However, if the diameter of the ion emission port is increased, the object can easily approach the discharge needle. When an object approaches the discharge needle during corona discharge, current may flow from the discharge needle to the object.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a static eliminator capable of suppressing a reduction in static elimination performance and a current flowing from a discharge needle to an object. .

  In order to achieve the above object, the invention according to claim 1 is provided with a discharge needle and voltage application means for applying a voltage to the discharge needle, and the ions supplied to the static elimination object by applying the voltage to the discharge needle. Detecting means for detecting an object approaching the discharge needle, and when the detection means detects the object, the voltage application means stops the voltage application to the discharge needle And a control means.

  According to this configuration, when the approach of the object to the discharge needle is detected by the detection means, the control means stops the voltage application to the discharge needle by the voltage application means, and therefore when the object approaches the discharge needle. The current from the discharge needle to the object is suppressed. And since an application of a voltage is stopped when an object is detected, it is suppressed that a static elimination performance falls and an electric current flows from a discharge needle to an object.

  According to a second aspect of the present invention, in the static eliminator according to the first aspect, there is provided an air blowing unit that blows the ions from the discharge needle toward the static elimination object. According to this configuration, since the ions are sprayed onto the static elimination object by the blowing unit, the static elimination is performed efficiently.

  According to a third aspect of the present invention, in the static eliminator according to the first or second aspect, the detection unit includes a light projecting unit that projects light and a light receiving unit that receives the light. The object is detected based on the amount of light received by the light receiving means. According to this configuration, since the detection unit is a so-called photoelectric sensor that detects an object based on the amount of light received by the light reception unit, when the blower unit that blows ions to the static elimination object is provided, In addition, the detection is performed without being influenced by the wind by the blowing means.

  According to a fourth aspect of the present invention, in the static eliminator according to the third aspect, the detection unit includes at least two sets of the light projecting unit and the light receiving unit whose optical axes are parallel to each other. And the light receiving means are arranged such that the optical axis is equal to or less than a predetermined interval across the discharge needle in a direction perpendicular to the ion emission direction with respect to the discharge direction of the ions from the tip of the discharge needle. Arranged in position. According to this configuration, at least two sets of light projecting means and light receiving means whose optical axes are parallel to each other are in an ion emission direction and perpendicular to the ion emission direction from the tip of the discharge needle. In FIG. 5, the discharge needle is disposed at a predetermined interval or less, so that it is detected that an object at a predetermined interval or more approaches the discharge needle.

  According to a fifth aspect of the present invention, in the static eliminator according to the third or fourth aspect, a plurality of the discharge needles are arranged in a line, and the light projecting means and the light receiving means are arranged along an arrangement direction of the discharge needles. A plurality of discharge needles are disposed at both ends of the main body case on the arrangement direction side so as to form an extending optical axis. According to this configuration, the light projecting means and the light receiving means are respectively disposed at both ends of the main body case on the arrangement direction side of the discharge needles arranged in a row so as to form optical axes extending along the arrangement direction. Therefore, it is not necessary to provide the light projecting means and the light receiving means for each discharge needle, so that an increase in the number of parts is suppressed.

  According to a sixth aspect of the present invention, in the static eliminator according to any one of the first to fifth aspects, the detection means includes a needle tip of the discharge needle and an ion emission port that accommodates the discharge needle. The region for detecting the object is formed between the two. According to this configuration, a region for detecting the object by the detection means is formed between the needle tip of the discharge needle and the ion emission port that accommodates the discharge needle. When the outside of the electrode is touched, voltage application to the discharge needle is not stopped and ion emission is continued.

  According to a seventh aspect of the present invention, in the static eliminator according to any one of the first to sixth aspects, the voltage applying unit is a high power source based on a power source and a power source voltage supplied from the power source. A high voltage generation circuit for generating a voltage, and when the detection unit detects the object, the control unit stops supply of a power supply voltage from the power source to the high voltage generation circuit. The voltage application to the discharge needle by the voltage application means is stopped. According to this configuration, the control means stops the supply of the power supply voltage from the power supply to the high voltage generation circuit, so the application of the voltage to the discharge needle is stopped with a simple configuration that does not require durability against the high voltage. Is done.

  The invention according to claim 8 is the static eliminator according to any one of claims 1 to 7, wherein an elapsed time from when the detection unit detects the object to when it is not detected is measured. Measuring means, and the control means stops voltage application to the discharge needle by the voltage application means by continuously stopping voltage application when the elapsed time is not less than a predetermined reference time. . According to this configuration, when the elapsed time is equal to or longer than the reference time, i.e., when the object remains in proximity to the discharge needle, the detection means does not detect the object thereafter. Even in a certain non-detection state, the voltage application means does not resume the voltage application to the discharge needle, so that it is further suppressed that the current flows from the discharge needle to the object.

  According to a ninth aspect of the present invention, in the static eliminator according to the eighth aspect, the control means resumes voltage application to the discharge needle by the voltage application means that is continuously stopped by re-applying power. Let According to this configuration, since the voltage application to the discharge needle is resumed by turning on the power of the static eliminator again, the operator can easily resume the voltage application to the discharge needle.

  According to a tenth aspect of the present invention, in the static eliminator according to the eighth or ninth aspect, when the elapsed time is less than the reference time, the control means supplies the discharge needle to the discharge needle with respect to the voltage applying means. The voltage application is resumed. According to this configuration, when the elapsed time is less than the reference time, that is, in the case of erroneous detection due to the influence of discharge noise, the control means restarts the voltage application to the discharge needle. It is not necessary to throw in.

  An eleventh aspect of the present invention is the static eliminator according to any one of the first to tenth aspects, further comprising notification means for notifying that the voltage application to the discharge needle is stopped. According to this configuration, the operator can easily grasp that the voltage application to the discharge needle is stopped.

  ADVANTAGE OF THE INVENTION According to this invention, the static elimination apparatus which can suppress that an electric current flows from a discharge needle to an object can be provided.

Hereinafter, an embodiment in which the present invention is embodied in a bar-type static eliminator will be described with reference to the drawings.
As shown in FIG. 1, the ion generation unit 10 of the static eliminator is formed in a substantially rectangular parallelepiped shape, and the base end (right side in FIG. 1) of the ion generation unit 10 is rotatable relative to the fan unit 60 within a predetermined angle range. It is connected. The ion generation unit 10 generates ions by corona discharge, and the fan unit 60 supplies air to the ion generation unit 10. With this configuration, the static eliminator sprays the generated ions on the static elimination object. The ions neutralize the static elimination object such as an integrated circuit charged by static electricity.

  The main body case 11 of the ion generation unit 10 is formed in a substantially rectangular tube shape, and a plurality of (for example, six) discharge units 40 are provided in the main body case 11. Each discharge unit 40 has a positive ion discharge needle (hereinafter, positive discharge needle) 41 to which a positive high voltage is applied and a negative ion discharge needle (hereinafter, negative discharge needle) to which a negative high voltage is applied. 42 is provided. The positive discharge needle 41 and the negative discharge needle 42 are arranged along the longitudinal direction of the ion generation unit 10 (the left-right direction in FIG. 1, hereinafter referred to as the x direction). Accordingly, the ion generation unit 10 includes a total of 12 positive discharge needles 41 and negative discharge needles 42 arranged in a row as a whole.

Next, the configuration of the ion generation unit 10 will be described in detail.
As shown in FIG. 2 (b), the main body case 11 includes a long box-shaped base portion 12 with one side and both ends in the x direction open, and one side facing the base portion 12 and the x direction. It is composed of a long box-shaped cover 13 whose both ends are open, and a pair of caps 14 which are fixed so as to close both ends of the base 12 and the cover 13 when assembled together. The base part 12, the cover 13, and the cap 14 are all made of resin, and in particular, the cover 13 is made of, for example, a conductive resin (for example, polycarbonate).

  A cavity 15 into which air from the fan unit 60 is sent is formed at the bottom of the base 12 so as to extend along the x direction. The partition wall 16 of the base portion 12 is formed with a pair of air discharge portions 17 for discharging the air sent into the cavity portion 15 and a pair of mounting holes 18 for mounting the discharge unit 40. A discharge unit 40 is provided on the upper surface of the.

  The discharge unit 40 is provided with a positive discharge needle 41 and a negative discharge needle 42 so as to sandwich a pair of air discharge portions 17 formed on the partition wall 16 along the x direction. A pair of attachment holes 40a are formed at both ends of the discharge unit 40 in the x direction. The discharge unit 40 is fixed on the partition wall 16 by screwing screws 43 in a state where the mounting holes 40 a are arranged corresponding to the mounting holes 18 on the partition wall 16. Note that a pair of power supply lines (not shown) are provided with the discharge unit 40 sandwiched between them. A positive high voltage is applied to the positive discharge needle 41 by one power supply line, and a negative high voltage is applied by the other power supply line. Applied to the negative discharge needle 42.

  A cover 13 is provided on the base portion 12 so as to cover each discharge unit 40. Corresponding to the position of each discharge unit 40, ion discharge ports 19a are formed at predetermined intervals on the upper wall 19 on the opposite side of the cover 13 from the opened side. Through holes 19b are formed at both ends in the direction. The ion emission port 19a is formed in a long hole extending along the x direction and is a direction from the discharge unit 40 toward the ion emission port 19a (vertical direction in FIG. 2B, hereinafter referred to as the z direction). ) With an opening diameter that does not obstruct the air flow supplied to the air.

  An insulating substrate 21 made of an insulating member is disposed on the back surface 20 side of the upper wall 19 corresponding to each ion emission port 19a. Each insulating substrate 21 is formed in a rectangular shape that extends long in the x direction as a whole, has a notch formed along a part of each ion emission port 19a, and faces away from the back surface 20 of the upper wall 19 side. Is formed with a conductor pattern that functions as a counter electrode.

  Each insulating substrate 21 is formed with a through hole 21a at a position corresponding to the through hole 19b of the upper wall 19, and each conductor pattern is formed with a through hole at a position corresponding to the through hole 21a. By connecting the conductor patterns of the insulating substrates 21 to each other by cable, the conductor patterns are electrically connected. For example, the conductor pattern of the insulating substrate 21 located on the base end side in the x direction is electrically connected to a ground line (not shown). Has been. That is, each conductor pattern is grounded to the ground level.

  On the surface 26 of the upper wall 19, the same number of conductive blocks 27 as the discharge units 40 are provided in a row along the x direction. In the conductive block 27, an ion emission port 27a having the same shape as the ion emission port 19a is formed. The conductive block 27 has attachment holes 27b corresponding to the through holes 19b of the upper wall 19 at both ends in the x direction of the ion emission ports 27a. The conductive block 27 and the insulating substrate 21 are fixed to the cover 13 by attaching conductive tapping screws 28 to the through holes 19b and 21a and the attachment holes 27b. Then, the conductive block 27 is electrically connected to the conductor pattern by the tapping screw 28, and the conductive block 27 is connected to the ground. Further, at both ends in the x direction of each conductive block 27, as shown in FIG. 2 (a), linear through holes 27c along the x direction are respectively short (the vertical direction in FIG. 2 (a)). Hereinafter, it is formed along the y direction).

  On the upper surface of the cap 14, indicator lights 29a to 29c are provided as notification means. Further, the cap 14 on the base end side is formed with a supply port 14 a for supplying the air flow supplied from the fan unit 60 to the hollow portion 15.

  The fan unit 60 includes a blower fan 61, and the blower fan 61 is connected to the cap 14 via a connecting portion 62 that is rotatably provided within a predetermined range. A hollow L-shaped tube (not shown) for supplying the air flow supplied from the blower fan 61 to the supply port 14 a is provided inside the connecting portion 62, and the base end of the L-shaped tube is connected to the blower fan 61. The tip is connected to the supply port 14 a of the cap 14 and communicates with the cavity 15 of the base 12.

  The ion generation unit 10 is provided with a light projecting element 30 as two sets of light projecting means and a light receiving element 31 as a light receiving means which are arranged to face each other. More specifically, two light projecting elements 30 are disposed along the y direction at the base end of the ion generation unit 10, and two light receiving elements 31 are disposed along the y direction at the distal end. The light projecting element is connected to an insulating substrate 21 provided on the proximal end side, and the light receiving element 31 is disposed on the insulating substrate 21 provided on the distal end side. As shown in FIG. 2A, the optical axis passes through the through hole 27c of the conductive block 27, and the positive discharge needle 41 and the negative discharge needle 42 are separated from each other at a predetermined interval (see from the x direction) in the ion emission ports 19a and 27a. For example, the light projecting element 30 and the light receiving element 31 are arranged so as to be sandwiched by the finger thickness) or less. Accordingly, the light projecting element 30 and the light receiving element 31 are arranged so that a region for detecting an object is formed between the needle tips of the positive discharge needle 41 and the negative discharge needle 42 and the ion emission ports 19a and 27a. In the present embodiment, the distance between the optical axis of the light projected from each light projecting element 30 and the ends in the y direction of the ion emission ports 19a and 27a is also set to be equal to or smaller than a predetermined distance. Further, the light projecting element 30 and the light receiving element 31 are juxtaposed so that the distance in the z direction from the tip of each positive discharge needle 41 and each negative discharge needle 42 is equal to or greater than the safety distance S (predetermined distance). The safety distance S is calculated by a prescribed formula, and the distance in the z direction is set to 12 mm.

Next, the electrical configuration of the static eliminator will be described.
As shown in FIG. 3, the static eliminator includes a positive high voltage generation circuit 70 a and a negative high voltage generation circuit 70 b, and both high voltage generation circuits 70 a and 70 b are connected to a power source 72 via a switch 71. The positive high voltage generation circuit 70 a is connected to each positive discharge needle 41, and the negative high voltage generation circuit 70 b is connected to each negative discharge needle 42. The positive high voltage generation circuit 70a includes an amplifying unit 73a and a driving unit 74a. The amplifying unit 73a is composed of a transistor, for example, and amplifies a signal from the power source 72 and outputs the amplified signal to the driving unit 74a. The drive unit 74a is composed of, for example, a power transistor, and amplifies and outputs the signal from the amplification unit 73a. The negative high voltage generation circuit 70b includes an amplification unit 73b and a drive unit 74b, and is configured in the same manner as the positive high voltage generation circuit 70a. That is, the power source 72, the positive high voltage generation circuit 70a, and the negative high voltage generation circuit 70b constitute voltage application means for applying a high voltage to each positive discharge needle 41 and each negative discharge needle 42.

  The static eliminator also includes a light projecting circuit 75 including the light projecting element 30, a light receiving circuit 76 including the light receiving element 31, and a control unit 77 serving as a control unit. In the control unit 77, a timer 78 as a measuring means is provided. The light projecting circuit 75 receives the output signal from the control unit 77 and causes the light projecting element 30 to emit light. The emitted light is photoelectrically converted by the light receiving element 31 and amplified by the light receiving circuit 76, and an output signal having a level corresponding to the amount of light received by the light receiving element 31 is output to the control unit 77. That is, the light projecting element 30, the light receiving element 31, and the control unit 77 constitute detection means. The control unit 77 is connected to the switch 71 and the indicator lights 29a to 29c.

Next, the charge removal operation for electrically neutralizing the charge removal object will be described.
When the operator turns on the power, the control unit 77 turns on the switch 71 and turns on the indicator lamp 29a to notify that the power is turned on. A power supply voltage is supplied from the power supply 72 to the high-voltage generating circuits 70a and 70b, and a high voltage is applied to each positive discharge needle 41 and negative discharge needle 42, and each positive discharge needle 41 and negative discharge needle 42 and the counter electrode ( Corona discharge occurs between the conductive pattern and the conductor pattern, and ions are generated. Further, an air flow is supplied from the fan unit 60 to the cavity portion 15 of the base portion 12, and an air flow along the z direction is discharged from each air discharge portion 17. Ions generated around the positive discharge needles 41 and the negative discharge needles 42 are released to the outside by riding on this air flow, and neutralize the static elimination object. At this time, since the ion discharge ports 19a and 27a are formed to have a size that does not hinder the air flow released in the z direction, ions on the air flow come into contact with the cover or the like before being sprayed on the static elimination object. Because it does not, improve the static elimination performance.

  Further, since the conductive block 27 provided on the surface 26 of the upper wall 19 is connected to the conductor pattern by being connected to the conductor pattern by the tapping screw 28, it is not charged even if ions are attached. The ion balance sprayed on the object is stabilized.

Next, a detection operation for detecting an object approaching the positive discharge needle 41 and the negative discharge needle 42 will be described.
During the above-described charge removal operation, light is projected by the light projecting element 30 to detect the intrusion of an object into each ion emission port 19a, 27a. When an object having a width equal to or larger than a predetermined interval along the y direction approaches the positive discharge needle 41 or the negative discharge needle 42 via the ion emission ports 19a and 27a, light projected from the light projecting element 30 by the object Is blocked, and the amount of light received by the light receiving element 31 changes. The control unit 77 compares the light reception signal level output from the light receiving element 31 with a predetermined threshold level, and when the light reception signal level is equal to or lower than the threshold level, the positive discharge needle 41 or the negative discharge An object approaching the needle 42 is detected. When the control unit 77 detects an object approaching the positive discharge needle 41 or the negative discharge needle 42, the control unit 77 sends a signal to the switch 71 to turn off the switch 71, and to the positive discharge needle 41 and the negative discharge needle 42. Stop supplying the power supply voltage. In addition, the control unit 77 turns on the indicator lamp 29b to notify that an object has been detected.

  Therefore, when the object approaches the positive discharge needle 41 or the negative discharge needle 42, the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is stopped. Current is prevented from flowing through the object. Further, it is possible to prevent a situation in which an object comes into contact with the positive discharge needle 41 or the negative discharge needle 42 and fails due to a high voltage. Furthermore, since the object is detected at a position that is a predetermined distance or more away from the tips of the positive discharge needle 41 and the negative discharge needle 42, the time between the detection of the object and the contact with the positive discharge needle 41 or the negative discharge needle 42. The supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is stopped, and current flowing from the positive discharge needle 41 or the negative discharge needle 42 to the object is further suppressed. In addition, since an object is detected based on the amount of light received by the light receiving element 31, detection is performed without being affected by the air flow supplied from the blower fan 61, such as an ultrasonic sensor. Further, the control unit 77 turns off the switch 71 connected between the power source 72 and the high voltage generation circuits 70a and 70b, thereby cutting off the supply of the power supply voltage to the high voltage generation circuits 70a and 70b. The voltage application to each positive discharge needle 41 and each negative discharge needle 42 is stopped. Therefore, application of voltage to the positive discharge needle 41 and the negative discharge needle 42 is stopped with a simple configuration that does not require durability against high voltage.

  In addition, the positive discharge needles 41 or the negative discharge needles 42 are arranged in a line along the x direction, and the light projecting element 30 on the base end side and the light receiving element 31 on the front end side are arranged to face each other. Therefore, it is not necessary to provide the light projecting element 30 and the light receiving element 31 for each positive discharge needle 41 and each negative discharge needle 42. Further, the light projecting element 30 and the light receiving element 31 are arranged so that a region for detecting an object is formed between the needle tips of the positive discharge needle 41 and the negative discharge needle 42 and the ion emission ports 19a and 27a. When the outside of the main body case is touched for adjusting the position of the static eliminator, the voltage application to the discharge needle is not stopped.

  Further, the control unit 77 measures the time (hereinafter referred to as elapsed time) from when the object is detected by the timer 78 until it is not detected, and the elapsed time and a predetermined reference time (for example, 1 second) are determined. Compare. When the elapsed time is equal to or longer than the reference time, the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is continuously stopped. The supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is resumed by turning on the switch 71 by the control unit 77 when the operator turns on the power again. For this reason, the supply of power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is resumed in a state where the object is close to the positive discharge needle 41 and the negative discharge needle 42, and current is prevented from flowing from the discharge needle to the object. Can be removed. Furthermore, when the power of the static eliminator is turned on again, voltage application to the positive discharge needle 41 and the negative discharge needle 42 is resumed, so that voltage application is easily resumed by the operator. When the elapsed time is less than the reference time, the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is resumed. For this reason, when the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is unnecessarily stopped due to the influence of discharge noise or the like, the worker does not have to turn on the power each time.

  Further, when the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is stopped, the control unit 77 lights the indicator lamps 29a to 29c. For this reason, the operator is notified that the static elimination operation is not performed, and it is easily determined whether or not the static elimination operation that is difficult to visually recognize is being performed.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Two sets of light projecting elements 30 and light receiving elements 31 arranged to face the ion generating unit 10 are provided. And the control part 77 was made to stop the power supply voltage applied to the positive discharge needle 41 and the negative discharge needle 42, if an object is detected. For this reason, even when the object approaches the positive discharge needle 41 or the negative discharge needle 42, the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is stopped. It is possible to suppress a current from flowing from the negative discharge needle 42 to the object.

  (2) Since the ion emission ports 19a and 27a are formed in a size that does not interfere with the air flow emitted in the z direction, ions on the air flow come into contact with the cover or the like before being sprayed on the static elimination object. Therefore, the static elimination performance can be improved.

(3) Since an object is detected based on the amount of light received by the light receiving element 31, detection can be performed without being affected by the air flow supplied from the blower fan 61 as in an ultrasonic sensor or the like.
(4) The light projecting element so that the optical axis passes through the through hole 27c of the conductive block 27 and the positive discharge needle 41 and the negative discharge needle 42 are sandwiched at a predetermined interval (for example, the thickness of the finger) when viewed from the x direction. Since 30 and the light receiving element 31 are arranged, an object having a width equal to or larger than a predetermined interval can be detected.

  (5) The light projecting element 30 and the light receiving element 31 are arranged so that a region for detecting an object is formed between the needle tips of the positive discharge needle 41 and the negative discharge needle 42 and the ion emission ports 19a and 27a. Therefore, when the outside of the main body case is touched to adjust the position of the static eliminator, the voltage application to the discharge needle is not stopped.

  (6) When the elapsed time is equal to or longer than the reference time, in order to continuously stop the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42, the object has entered the ion emission ports 19a and 27a Thus, the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 can be resumed, and current can be prevented from flowing from the discharge needle to the object.

  (7) When the elapsed time is less than the reference time, the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is resumed. Therefore, the positive discharge needle 41 and the negative discharge needle are caused on the object by the influence of discharge noise or the like. When the supply of the power supply voltage to 42 is stopped unnecessarily, it is possible to prevent the operator from turning on the power each time.

  (8) The positive discharge needles 41 or the negative discharge needles 42 are arranged in a line along the x direction, and a plurality of light projecting elements 30 facing the tip end side in the x direction are provided on the insulating substrate 21 on the base end side in the x direction. A plurality of light receiving elements 31 are arranged on the insulating substrate 21 at the tip end side in the x direction and facing the base end side in the x direction. Therefore, it is not necessary to provide the light projecting element 30 and the light receiving element 31 for each positive discharge needle 41 and each negative discharge needle 42, so that the number of parts can be reduced.

  (9) The control unit 77 turns off the switch 71 connected between the power source 72 and the high voltage generation circuits 70a and 70b, thereby cutting off the supply of the power supply voltage to the high voltage generation circuits 70a and 70b. The voltage application to each positive discharge needle 41 and each negative discharge needle 42 was stopped. Therefore, application of voltage to the positive discharge needle 41 and the negative discharge needle 42 can be stopped with a simple configuration that does not require durability against high voltage.

  (10) When the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is stopped, the control unit 77 turns on the indicator lamp 29b, so that the operator is informed that the static elimination operation is not performed. Thus, the operator can easily determine whether or not a static elimination operation that is difficult to visually recognize is being performed.

  (11) Since the conductive block 27 provided on the surface 26 of the upper wall 19 is connected to the conductor pattern by being connected to the conductor pattern by the tapping screw 28, it is not charged even if ions are attached. The ion balance sprayed on the object can be stabilized.

(12) Since the voltage application to the positive discharge needle 41 and the negative discharge needle 42 is resumed by turning on the power of the static eliminator again, the operator can easily resume the voltage application.
In addition, you may implement each said embodiment in the following aspects.

In the above embodiment, the indicator lamp 29b is turned on as a notification unit. However, the present invention is not limited to this. For example, the operator may be notified using a speaker that emits a warning sound.
In the above embodiment, the reference time is 1 second, but is not limited to this, and may be a time shorter than 1 second or a time longer than 1 second.

  In the above embodiment, a plurality of light projecting elements 30 facing the tip end in the x direction are arranged on the insulating substrate 21 on the base end side in the x direction, and the base substrate side in the x direction is faced on the insulating substrate 21 on the tip end side in the x direction. Although a plurality of light receiving elements 31 are arranged and an object approaching all the positive discharge needles 41 and the negative discharge needles 42 is detected, the present invention is not limited to this. For example, a plurality of light projecting elements 30 and light receiving elements 31 may be provided for each positive discharge needle 41 and each negative discharge needle 42.

In the above embodiment, two light projecting elements 30 and two light receiving elements 31 are provided, but each may be one, or three or more.
In the above embodiment, the control unit 77 turns off the switch 71 connected between the power supply 72 and both the high voltage generation circuits 70a and 70b, so that the power supply voltage to the both high voltage generation circuits 70a and 70b is reduced. Supply was interrupted and voltage application to each positive discharge needle 41 and each negative discharge needle 42 was stopped. Not only this but the place which stops the voltage application to each positive discharge needle 41 and each negative discharge needle 42 may be anywhere.

In the above embodiment, the fan unit 60 is provided. However, the present invention is not limited to this, and the fan unit 60 may not be provided.
In the above embodiment, one positive discharge needle 41 and one negative discharge needle 42 are provided in one discharge unit 40, but the present invention is not limited to this, and two or more may be provided in one discharge unit 40.

In the above embodiment, a so-called photoelectric sensor that detects an object based on the amount of light received by the light receiving element 31 is used. However, the present invention is not limited thereto, and the object may be detected by, for example, an ultrasonic sensor.
In the above embodiment, when the elapsed time is less than the reference time, the supply of the power supply voltage to the positive discharge needle 41 and the negative discharge needle 42 is resumed. May be resumed.

  In the above-described embodiment, the bar-type static eliminator in which a plurality of discharge units 40 are arranged in a line is embodied. However, the present invention may be embodied in a spot-type static eliminator that performs a static elimination operation with a single discharge unit.

  In the above embodiment, the discharge unit 40 includes the pair of positive discharge needles 41 and the negative discharge needles 42 to generate positive and negative ions. However, the present invention is not limited thereto, and an AC high voltage is applied to one discharge needle, Positive and negative ions may be generated alternately.

The top view of a static elimination apparatus. (A) The enlarged plan view of a static elimination apparatus, (b) The expanded sectional view of a static elimination apparatus. The block circuit diagram of a static elimination apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Ion production | generation unit, 11 ... Main body case, 12 ... Base part, 13 ... Cover, 19a, 27a ... Ion discharge port, 29a-29c ... Indicator lamp, 30 ... Light emitting element, 31 ... Light receiving element, 41 ... Positive ion Discharge needle, 42 ... negative ion discharge needle, 60 ... fan unit, 70a ... positive high voltage generation circuit, 70b ... negative high voltage generation circuit, 71 ... switch, 72 ... power supply, 73a, 73b ... amplification unit, 74a, 74b ... Driver, 77 ... Control, 78 ... Timer.

Claims (11)

A discharge needle, and voltage applying means for applying a voltage to the discharge needle,
A static elimination device that generates ions to be supplied to a static elimination object by applying a voltage to the discharge needle,
Detecting means for detecting an object approaching the discharge needle;
Control means for stopping voltage application to the discharge needle by the voltage application means when the detection means detects the object;
A static eliminator characterized by comprising: The static eliminator according to claim 1,
A static eliminator comprising air blowing means for blowing the ions from the discharge needle toward the static elimination object. The static eliminator according to claim 1 or 2,
The static eliminator is characterized in that the detecting means includes a light projecting means for projecting light and a light receiving means for receiving the light, and detects the object based on the amount of light received by the light receiving means. In the static elimination apparatus of Claim 3,
The detection means includes at least two sets of the light projecting means and the light receiving means whose optical axes are parallel to each other,
The light projecting means and the light receiving means are arranged such that the optical axis is at a predetermined interval across the discharge needle in a plane that is more in the ion emission direction than the needle tip of the discharge needle and perpendicular to the ion emission direction. A static eliminator, which is disposed at the following position. In the static elimination apparatus of Claim 3 or 4,
A plurality of the discharge needles are arranged in a row,
The light projecting means and the light receiving means are respectively disposed at both ends of the main body case in the arrangement direction of the plurality of discharge needles so as to form an optical axis extending along the arrangement direction of the discharge needles. Static neutralizer. In the static elimination apparatus as described in any one of Claims 1-5,
The static eliminator according to claim 1, wherein the detection means is arranged so that a region for detecting the object is formed between a needle tip of the discharge needle and an ion emission port that accommodates the discharge needle. In the static elimination apparatus as described in any one of Claims 1-6,
The voltage application means includes a power supply and a high voltage generation circuit that generates a high voltage based on a power supply voltage supplied from the power supply,
When the detecting means detects the object, the control means stops the supply of power supply voltage from the power supply to the high voltage generation circuit, thereby applying voltage to the discharge needle by the voltage applying means. A static eliminator characterized by being stopped. In the static elimination apparatus as described in any one of Claims 1-7,
Measuring means for measuring an elapsed time from when the detecting means detects the object until it becomes non-detected;
The control means stops voltage application to the discharge needle by the voltage application means by continuously stopping voltage application when the elapsed time is equal to or longer than a predetermined reference time. Static neutralizer. The static eliminator according to claim 8,
The neutralizing device according to claim 1, wherein the control unit restarts the voltage application to the discharge needle by the voltage application unit, which is continuously stopped, by turning on the power again. The static eliminator according to claim 8 or 9,
When the elapsed time is less than the reference time, the control unit causes the voltage application unit to resume the voltage application to the discharge needle. In the static elimination apparatus as described in any one of Claims 1-10,
A static eliminator comprising an informing means for informing that voltage application to the discharge needle is stopped.

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