JP2005340115A - Discharging member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology of eliminating charged static electricity without causing a pain against a human body. <P>SOLUTION: This is a destaticizing member to prevent arc discharge between a grounded conductive structural body and a charged human body, wherein a surface resistant measured value between two points 6.4 mm apart of the destaticizing member is within a range of 1×10<SP>5</SP>to 5×10<SP>10</SP>Ω. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a charge eliminating member for a charged human body.

  The human body is always charged by friction with carpets and clothing. Contact with a part of a structure that is electrically charged and grounded, such as a doorknob of a building, a doorknob of an automobile, a metal desk, a locker, or a metal part of a showcase Arc discharge may occur between the part and the fingertip, and a large impact or severe pain may be felt. This discharge phenomenon occurs because electric charges charged on the human body flow toward the conductive structure and are neutralized at once. Moreover, in a manufacturing factory for electronic parts and the like, such discharge may damage the product and contribute to the generation of defective products.

  Conventionally, various methods have been proposed for antistatic technology and charged charge removal technology. Patent Document 1 discloses a “crew removal device”. This device detects the unlocking of the door lock with the door lock sensor when getting on the vehicle, and detects the change in the seat pressure with the seating pressure sensor when getting off the vehicle, thereby generating ions, respectively. This removes the electric charge charged to the surface. However, this device is an expensive device that requires a precise mechanism, particularly used for static elimination in automobiles, and is not applicable to general static elimination.

Patent Document 2 proposes a sticking type electric shock prevention sheet in which a conductive metal layer is formed by sputtering on the surface of a cloth-like material. Although this electric shock prevention sheet is relatively inexpensive, it needs to be individually attached to many places where an arc is generated with the human body. Further, for example, when pasting on a door knob of an automobile, a door knob of a front door, etc., the aesthetic appearance of the pasting part is remarkably impaired.
JP 2002-178859 A JP 2001-234469 A

    Therefore, a main object of the present invention is to provide a technique for removing charged charges without causing pain to the human body.

  As a result of intensive studies to solve the above problems, the present inventor interposes a static elimination member having a specific surface resistance measurement value between a grounded conductive structure and a charged human body. In some cases, it has been found that a very small discharge (corona discharge) that does not give pain or impact to the human body is generated, and the static elimination is performed effectively.

That is, this invention provides the following static elimination member.
1. A static elimination member for preventing arc discharge between a grounded conductive structure and a charged human body, and a surface resistance measurement value between two points 6.4 mm away from the static elimination member is 1 × 10 ⁵ A static elimination member characterized by being in a range of ˜5 × 10 ¹⁰ Ω.
2. The neutralizing member according to item 1, wherein a measured value of surface resistance between two points separated by 6.4 mm is within a range of 1 × 10 ⁶ to 1 × 10 ¹⁰ Ω.
3. The static eliminator according to item 2, wherein a measured value of surface resistance between two points separated by 6.4 mm is within a range of 1 × 10 ⁷ to 1 × 10 ⁹ Ω.
4). The door knob for construction which arranged the static elimination member in any one of the above-mentioned items 1-3 on the surface.
5). 5. An architectural door comprising the door knob according to item 4.
6). The door knob for motor vehicles which has arrange | positioned the static elimination member in any one of said claim | item 1-3 on the surface.
7). An automobile door comprising the door knob according to Item 6.
8). The door lining for motor vehicles which has arrange | positioned the static elimination member in any one of said claim | item 1-3 on the surface.
9. The door for motor vehicles provided with the door lining of the said claim | item 8.
10. The metal desk which has arrange | positioned the static elimination member in any one of said claim | item 1-3 on the surface.
11. The metal locker which arrange | positioned the static elimination member in any one of said claim | item 1-3 on the surface.
12 The metal part of the showcase which has arrange | positioned the static elimination member in any one of said claim | item 1-3 on the surface.

  According to the present invention, since there are neutralizing members exhibiting an appropriate surface resistance in various devices and members that come into contact with a charged human body, it is possible to eliminate static electricity from the human body without feeling shock or pain due to extremely weak discharge. Done.

  Therefore, in many cases, the user is not even aware that static elimination is being performed.

In the present invention, the static elimination member is a part of a grounded conductive structure (automobile door knob, automobile door lining, building door knob, metal desk and locker surface covering, metal part of a showcase. Cover). For example, in the case of a metal door knob of an automobile, the surface resistance measurement value between two points, usually 6.4 mm apart, is approximately 1 × 10 ^{5 to} 5 × 10 ¹⁰ Ω on the surface, preferably 1 × 10 ⁶ to 1 A static elimination member is formed by laminating a plastic film so as to be about × 10 ¹⁰ Ω, more preferably about 1 × 10 ⁷ to 1 × 10 ⁹ Ω. The same applies to the lining of metal doors of automobiles and metal door knobs of buildings. The thickness of the plastic film is not particularly limited, but is usually about 0.1 mm to 5 mm, more preferably about 0.3 mm to 3 mm.

Further, in the case of a door knob for a light vehicle that is required to be reduced in weight, a molded plastic that shows a predetermined surface resistance measurement value may be used as it is as a static elimination member. Furthermore, a conductive plastic film may be laminated on the surface of a plastic substrate that has been previously molded into a predetermined shape, or the conductive plastic may be applied to the substrate surface once or twice or more. In the case of laminates and coated body has a volume resistivity of the substrate plastic before lamination or ^{painting, 1 × 10 5 ~5 × 10} 10 Ω · m or so, - preferably ^{1 × 10 6 ~1 × 10 10} Ω About m, more preferably about 1 × 10 ⁷ to 1 × 10 ⁹ Ω · m is preferable.

In addition, in the case of metal desk and locker surface coating, showcase metal part coating, etc., the surface resistance measurement value between two points usually 6.4 mm away is 1 × 10 ^{5 to} 5 × 10 5 ^A plastic film is laminated or a plastic layer is formed so as to be about ¹⁰ Ω, preferably about 1 × 10 ⁶ to 1 × 10 ¹⁰ Ω, more preferably about 1 × 10 ⁷ to 1 × 10 ⁹ Ω. Thereby, a static elimination member is formed.

  Conductive plastics are powdered conductive materials such as carbon (carbon fiber, carbon black, etc.), Al, Ge, Si, etc. in various base resins such as PP, PS, ABS, modified PPE, PC, PTB, PPS, PEI. Various products are commercially available. In the present invention, as long as the measured value of the surface resistance shows a predetermined value, a commercially available product can be used.

  In the present invention, the “measured value of surface resistance between two points separated by 6.4 mm” means that when a film is laminated on the surface of a metal member, two measured points at 6.4 mm apart on the film surface after lamination. It means the resistance value obtained by pressing a contact type probe, measuring the current flowing by applying 10V or 100V, and dividing the voltage by the current.

  In addition, when a conductive plastic film is laminated on the surface of a plastic molded body, a two-contact type probe is pressed at two points 6.4 mm away from the laminated film surface, and the flowing current is measured by applying 10 V or 100 V. And the resistance value obtained by dividing the voltage by the current.

  In addition, when conductive plastic is coated on the surface of a plastic molded body, a two-contact type probe is pressed at two points 6.4 mm away from the surface of the molded body after coating, and the flowing current is measured by applying 10V or 100V. And the resistance value obtained by dividing the voltage by the current.

Examples and Comparative Examples are shown below to further clarify the features of the present invention.
[Example 1]
Cover the grounded doorknob with an electrically conductive polystyrene film with a thickness of 1 mm, press the probe to two points 6.4 mm away from the surface, apply 10 V, measure the flowing current, and divide the voltage by the current. As a result, the resistance value obtained was 1 × 10 ⁹ Ω.

  Next, when the human body was charged to 12 kV and a fingertip was brought close to the door knob covered with the polystyrene film, a minute discharge was generated so as not to cause pain in the human body, and the charge was neutralized.

In this example and the following comparative examples, the surface resistance was measured using a surface resistance measuring device “Model 152” manufactured by TRECK in the US, and a two-terminal probe “Model 152P-2P” for measuring surface resistance manufactured by TRECK in the US as a probe. And measured.
[Comparative Example 1]
When the grounded doorknob was covered with a 1 mm thick polystyrene film having an electric conductivity higher than that of Example 1, the probe was pressed against two points 6.4 mm away from the surface, and 10 V was applied to flow. The resistance value obtained by measuring the current and dividing the voltage by the current was 1 × 10 ¹¹ Ω.

Next, when the human body was charged to 12 kV and the fingertip was brought close to the door knob covered with polystyrene film, the charge was not neutralized. After that, when a grounded part other than the door knob was touched, arc discharge occurred. Woke up and felt pain at the fingertips.
[Comparative Example 2]
The grounded doorknob was covered with a 1 mm thick polystyrene film having a lower electrical resistance than that of Example 1, and then the probe was pressed against two points 6.4 mm away from the surface, and 10 V was applied to flow. The resistance value obtained by measuring the current and dividing the voltage by the current was 1 × 10 ⁴ Ω.

  Next, when the human body was charged to 12 kV and the fingertip was brought close to the door knob covered with the polystyrene film, an arc discharge occurred and the fingertip felt pain.

Claims (12)

A static elimination member for preventing arc discharge between a grounded conductive structure and a charged human body, and a surface resistance measurement value between two points 6.4 mm away from the static elimination member is 1 × 10 ⁵ A static elimination member characterized by being in a range of ˜5 × 10 ¹⁰ Ω. The neutralization member according to claim 1, wherein a surface resistance measurement value between two points separated by 6.4 mm is within a range of 1 × 10 ⁶ to 1 × 10 ¹⁰ Ω. The neutralization member according to claim 2, wherein a surface resistance measurement value between two points separated by 6.4 mm is within a range of 1 x 10 ⁷ to 1 x 10 ⁹ Ω. A doorknob for construction in which the charge eliminating member according to any one of claims 1 to 3 is arranged on the surface. An architectural door comprising the door knob according to claim 4. The door knob for motor vehicles which has arrange | positioned the static elimination member in any one of Claims 1-3 on the surface. An automobile door comprising the door knob according to claim 6. A door lining for automobiles, wherein the static eliminator according to claim 1 is disposed on the surface. The door for motor vehicles provided with the door lining of Claim 8. The metal desk which has arrange | positioned the static elimination member in any one of Claims 1-3 on the surface. The metal locker which has arrange | positioned the static elimination member in any one of Claims 1-3 on the surface. The metal part of the showcase which has arrange | positioned the static elimination member in any one of Claims 1-3 on the surface.