JPH02288200A - Electrostatic discharging device - Google Patents

Abstract

PURPOSE:To discharge electrostatic charges accumulated on a human body without giving it shock by arranging a flexible conductive member with a certain space reserved over the surface of a conductive object. CONSTITUTION:Through an insulative spacer 5, a flexible conductive member 4 is arranged around the knob body 3 of a door 1, and when a person grips the knob 2, this flexible conductive member 4 deflects to allow a boss 6 to contact the surface of the knob body 3. That is, the flexible conductive member 4 deflects after contacting of the person's body with the flexible conductive member 4 to cause electrical contacting with a conductive object 3, and spark discharges are generated between it and the flexible conductive member 4. This enables discharging of the electric charges without generating spark discharge between the person's body and the conductive object 3, which will eliminate giving a sense of discomfort.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrostatic discharge device, and more specifically, the present invention relates to an electrostatic discharge device, and more particularly, when a human comes into contact with a conductive object such as a doorknob, a shock is applied to the human body. The present invention relates to a device for discharging static charges accumulated in the human body without causing damage to the human body.

[Prior Art] Since the human body has a certain amount of capacity, static charges are accumulated in the human body due to friction with clothing and the like. When a human body touches a conductive object, such as a door handle or knob, with static charge accumulated, the electrostatic charge accumulated on the human body is rapidly transferred to the conductive object due to the potential difference. At this time, spark discharge may occur between the human body and the conductive object.
It causes a big shock to the human body.

On the other hand, in semiconductor manufacturing factories and the like, when static charges accumulated in the human body are discharged into equipment, noise and the like can cause the equipment to malfunction or produce defective products. Therefore, it is necessary to discharge the electric charge accumulated in the human body in some way before entering the factory.

[Problems to be Solved by the Invention] Conventionally, there has been no effective method for discharging electric charges accumulated in the human body without applying a shock to the human body. An indirect method has been to spray the person or clothing with an antistatic spray, but this method is cumbersome and uncomfortable.

This invention was made in order to solve the above-mentioned problems, and provides an electrostatic discharge device that can discharge static charges accumulated in the human body without applying a shock to the human body. The purpose is to

[Means to solve the problem]

In the electrostatic discharge device according to claim 1 of the present invention, flexible conductive members are arranged at predetermined intervals on the surface of a conductive object.

In the electrostatic discharge device according to claim 2 of the present invention, a variable resistance member whose resistance value is reduced by contact pressure is provided on the surface of a conductive object.

The electrostatic discharge device according to claim 3 of the present invention includes a conductive member disposed on the surface of a conductive object with an insulating part interposed therebetween, and a contact for detecting that a human body has contacted the conductive member. It includes a detection means and a switch means for electrically connecting the conductive member and the conductive object in response to the detection output of the contact detection means.

[Function] In the invention according to claim 1, after the human body comes into contact with the flexible conductive member, the flexible conductive member bends and makes electrical contact with the conductive object. A spark discharge occurs between the conductive member and the conductive object, and does not cause a shock to the human body.

In the invention according to claim 2, since the resistance value of the variable resistance member is reduced by the contact pressure, a sudden discharge does not occur between the human body and the conductive object, and no shock is applied to the human body.

In the invention according to claim 3, after the contact of the human body is detected by the contact detection means, the conductive member and the conductive object are electrically connected to each other.
For the same reason as the invention related to , it does not cause a shock to the human body.

In other words, if you touch a conductive knob or handle while holding a coin or key, a spark discharge will occur between the coin or key and the knob or handle, and it is empirically known that there will be no shock to the human body. This invention utilizes such empirical facts to discharge static charges accumulated in the human body.

[Embodiment] FIG. 1 is a sectional view showing an embodiment of the present invention applied to a door knob. In the figure, a knob 2 is rotatably attached to a door 1. The knob body 3 of this knob 2 is formed of a conductive member such as metal. A flexible conductive member 4 is arranged around the knob body 3 with an insulating spacer 5 interposed therebetween. Therefore, a predetermined distance is provided between the flexible conductive member 4 and the knob body 3 by the spacer 5. A protrusion 6 is formed on the inner surface of the flexible conductive member 4 facing the surface of the knob body 3. Note that, as the flexible conductive member 4, a metal plate having a large deflection rate, a conductive plastic, or the like is used.

In the embodiment shown in FIG. 1, when a person grasps the knob 2, the flexible conductive member 4 flexes and the protrusion 6 comes into contact with the surface of the knob body 3. Therefore, no spark discharge occurs between the human body and the knob body 3, and no impact is given to the human body.

FIG. 2 is a sectional view showing another embodiment of the present invention applied to a door knob. In the figure, a variable resistance member 7 is provided on the surface of the knob body 3. The variable resistance member 7 is a member whose resistance value decreases depending on contact pressure, and is made of, for example, a foamed resin containing a large amount of carbon.

In the embodiment shown in FIG. 2, even when a human hand approaches the knob 2, the resistance value of the variable resistance member 7 is initially high;
No spark discharge occurs between the human hand and the variable resistance member 7. When a human hand grasps the knob 2, the variable resistance member 7
The resistance value gradually decreases depending on the contact pressure. As a result, the discharge current flowing from the human body to the knob body 3 gradually increases.

FIG. 3 is a sectional view showing still another embodiment of the present invention applied to a door knob. In the figure, the knob body 3
A conductive member 8 such as metal or conductive plastic is placed on the surface of the
are arranged with an insulating member 9 in between. Therefore, the conductive member 8 is insulated from the knob body 3 by the insulating member 9. A switch circuit 10 is provided between the conductive member 8 and the knob body 3. For example, as shown in FIG. 4, the switch circuit 10 includes a plurality of transistors 11 connected in series between the conductive member 8 and the knob body 3, and supplies on/off signals to the gates of these transistors 11. It is composed of a touch sensor 12. The touch sensor 12 is for detecting that a human hand has touched the conductive member 8 and turning on each transistor 11 . Note that only one transistor 11 may be inserted between the conductive member 8 and the knob body 3, but materials such as semiconductors are often weak against high voltage, so this In the embodiment, a plurality of transistors 11 are connected in series.

In the embodiment shown in FIGS. 3 and 4, the touch sensor 12 normally turns each transistor 11 off. Therefore, the conductive member 8 and the knob body 3 are insulated. Even if a human hand approaches the conductive member 8 in this state, since the conductive member 8 is insulated, no spark discharge occurs between the conductive member 8 and the human hand. Therefore, no impact is given to the human body. When a human hand touches the conductive member 8, the touch sensor 12 detects the contact and turns on each transistor 11. As a result, the conductive member 8 and the knob body 3 become electrically connected, and the static charge accumulated in the human body is discharged to the knob body 3 via the switch circuit 10.

Various configurations are possible for the touch sensor 12 shown in FIG. 4. For example, a solar cell is provided on a part of the surface of the conductive member 8, and normally the transistor 11 is turned off by the output of this solar cell, and when a human hand grasps the knob 2, the solar cell is blocked from light and the output is output. It may be configured such that the voltage decreases and the transistor 11 is turned on. Further, as shown in FIG. 5(a), the touch sensor 12 may be configured by an LC resonance circuit 13 and a resonance detection circuit 14. In this case, when the human body touches the conductive member 8, the capacitance xCr of the human body is connected in parallel to the resonance circuit 13, so the resonance frequency of the LC resonance circuit 13 changes, and this is detected by the resonance detection circuit 14. Ru. Therefore, by controlling the on/off state of each transistor 11 based on the output of the resonance detection circuit 14, the disconnection/connection between the conductive member 8 and the knob body 3 can be effectively controlled.

In addition, although all the embodiments described above are applied to door knobs, the present invention is not limited to door knobs and can be applied to various things. That is,
If the part that is touched by humans is made of a conductive material, discharge will occur, so the present invention can be applied to all such conductive objects. For example, if it is necessary to forcibly discharge the electric charge accumulated in the human body, such as in a semiconductor device manufacturing factory, this device should be installed on a conductive wall, etc., and workers should periodically touch it. The accumulated charge may be discharged. In this case, the variable resistance member 7 shown in FIG. 2 may be formed into a sheet and attached to a wall or the like.

[Effects of the Invention] As described above, according to the present invention, when a human body comes into contact with a conductive object, the electric charge accumulated in the human body is eliminated without spark discharge occurring between the human body and the conductive object. can be discharged, so it does not cause discomfort to the human body.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention applied to a door knob. FIG. 2 is a sectional view showing another embodiment of the present invention applied to a door knob. FIG. 3 is a sectional view showing still another embodiment of the present invention applied to a door knob. FIG. 4 is a circuit diagram showing an example of the configuration of the switch circuit 10 shown in FIG. 3. FIG. 5 is a circuit diagram showing an example of the configuration of the touch sensor 12 shown in FIG. 4. In the figure, 1 is a door, 2 is a knob, 3 is a knob body, 4 is a flexible conductive member, 5 is a spacer, 6 is a protrusion, 7 is a variable resistance member, 8 is a conductive member, 9 is an insulating member, 10 1 is a switch circuit, 12 is a touch sensor, 13 is an LC resonance circuit, 1
4 indicates a resonance detection circuit. 2nd I27

Claims (3)

[Claims] (1) A device for discharging static charge accumulated in a human body without giving a shock to the human body when the human comes into contact with a conductive object, the device comprising: a device that dissipates static charges accumulated in the human body without causing a shock to the human body, and which What is claimed is: 1. An electrostatic discharge device comprising: a flexible electrically conductive member disposed with a flexible conductive member that is deflected by human contact to electrically contact the electrically conductive object; (2) A device for discharging static charge accumulated in a human body without applying a shock to the human body when the human comes into contact with a conductive object, the device being provided on the surface of the conductive object, An electrostatic discharge device comprising a variable resistance member whose resistance value decreases depending on contact pressure. (3) A device for discharging static charge accumulated in a human body without giving a shock to the human body when the human comes into contact with a conductive object, the device comprising an insulating member interposed between the surface of the conductive object. a conductive member disposed between the conductive member, a contact detection means for detecting that a human body has touched the conductive member, and a contact detection means that detects contact between the conductive member and the conductive object in response to a detection output of the contact detection means An electrostatic discharge device comprising a switch means for electrically conducting between the two.