JPH0227520Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a wrist strap that is worn around the wrist or the like in order to release static electricity accumulated in the human body when handling semiconductor devices.

BACKGROUND ART When handling semiconductor devices, from the manufacture of integrated circuits to the mounted products, there is a risk of damaging the semiconductor devices if the static electricity accumulated in the worker's body is not immediately dissipated.
Therefore, in rooms where semiconductor devices themselves or parts or products containing semiconductor devices are handled, conductive materials should be used for work tables, chairs, floors, containers, etc., or these should be covered with conductive sheets or covers. , it is common practice to further ground. In addition, workers are required to wear conductive aprons, conductive arm covers, and conductive gloves, and they are also required to wear conductive wrist straps on their wrists (hands and ankles) and ground them with a ground wire.

Wrist straps commonly used today are made of plastic or rubber sheets with a large amount of carbon black kneaded into them.

A cloth band made from fiber mixed with fine stainless steel wire has also been proposed as a wrist strap. (Refer to Utility Model Publication No. 55-52833).

Although it is not related to wrist straps, Japanese Patent Application Laid-Open No. 55-51873 discloses that after adsorbing monovalent copper ions to acrylic fibers, metal copper is reduced and precipitated into the fibers using a reducing agent. A method for obtaining conductive fibers is shown, and there is also a description that various knitted fabrics can be made from the conductive fibers.

Problems to be Solved by the Invention However, the conventional wrist strap made of a carbon black kneaded sheet is heavy and feels cold.

Since the wrist strap has no breathability, you will get sweaty and feel uncomfortable while wearing it.

Because it contains carbon black, you can only get a black wrist strap, which visually lacks fashionability.

The ground wire attached to the wrist strap is also heavy and lacks flexibility, giving the worker a feeling of being tied down.

The wrist strap attached to the wrist becomes a concern and reduces work efficiency.

There are other problems.

The wrist strap described in Japanese Utility Model Publication No. 55-52833 has a thin stainless steel wire that has very good conductivity (for example, a surface resistance value of 10 ^-1 Ω or less).
When the ground wire attached to the wrist strap comes into contact with a charged object, an overcurrent may reversely flow toward the human body.

The wrist strap of the present invention solves the above-mentioned problems of conventional wrist straps.

Means for Solving the Problems The present invention is based on the following points: ``One longitudinal end of a lightweight, flexible, and breathable belt 1 made of woven fabric, nonwoven fabric, or knitted fabric is connected to a ground wire. A fastener 5 for attaching and detaching the belt 1 and a hook-and-loop fastener 4' for attaching the belt 1 to a wrist are provided, and a hook-and-loop fastener 4' at the other end of the belt 1 in the longitudinal direction is provided. ', and after adsorbing copper ions to the fibers having cyano groups from the fastener 5 provided at one end of the belt 1 to the other end of the belt 1. A wrist strap for handling semiconductor devices having a structure in which at least one seam is sewn with a thread 2 made of copper-adsorbing fiber obtained by reduction."

The present invention will be explained in detail below.

As the belt 1, a lightweight, flexible, and breathable belt made of woven fabric, nonwoven fabric, or knitted fabric is used.

A fastener 5 is provided at one end in the longitudinal direction of the belt 1 so that it can be freely attached to and detached from the ground wire.
A typical example of the fastener 5 is a hook (snap).

The ground wire can be a conventionally used ground wire made of resin-coated copper wire, a tape-like or string-like material made of a lightweight, flexible material, sewn with conductive fiber thread as a sewing thread, or Threads made of conductive fibers twisted together or mixed and twisted with other ordinary threads can be used. A fastener that engages with the fastener 5 is also provided at one end of the ground wire. At the other end of the ground wire,
Provide clips, etc. as necessary to facilitate grounding of contact with workbenches, etc. A resistor may be provided at any point on the ground wire or at the point where the ground wire connects to the wrist strap.

At one longitudinal end of the belt 1, together with the aforementioned fastener 5, a hook-and-loop fastener 4' is provided to enable the belt 1 to be worn on a wrist.

On the other hand, on the other end of the belt 1 in the longitudinal direction, there is provided a surface fastener 4 that can engage with the surface fastener 4' on the one end. By engaging the hook-and-loop fastener 4' with the hook-and-loop fastener 4, it can be attached to the wrist with a single touch.

In the present invention, copper-adsorbing fibers obtained by adsorbing copper ions to fibers having a cyano group and then reducing the cyano group-containing fibers from the fastener 5 provided at one end of the belt 1 toward the other end of the belt 1 are used. At least one seam is provided using thread 2 of the same type by sewing with a sewing machine. The thread 2 made of copper-adsorbing fibers is obtained by twisting or spinning copper-adsorbing fibers. It is also possible to use yarns mixed with other fibers. The shape of the seam may be arbitrary, such as straight, zigzag, or patterned.

In this case, if a plurality of stitches made of copper-adsorbing fiber thread 2 are provided from the fastener 5 provided at one end of the belt 1 toward the other end of the belt 1, the reliability of static electricity removal by the wrist strap can be improved. It increases even more.

In FIGS. 1 and 2 showing an embodiment of the present invention, one seam is provided in a straight line along both ends of the belt 1 in the longitudinal direction, and a zigzag pattern is also provided in the longitudinal direction between the seams. An example is shown in which one article is provided.

From the viewpoint of wearability, it may be desirable to make the belt 1 slightly thicker by overlapping woven fabric or the like. In such a case, it is convenient to make the belt 1 thicker by overlapping the thread 2 made of copper-adsorbing fibers, since the desired conductivity can be obtained at the same time as the overlapping sewing.

The conductivity between both ends of the wrist strap of this invention and the ground wire is determined by the surface resistance value, for example.
It is approximately 10 ⁵ to ^{10 6} Ω.

Therefore, the wrist strap of the present invention is useful as a wrist strap for handling semiconductor devices.

Function: To attach the wrist strap of the present invention to a wrist, engage the fastener at one end of the ground wire with the fastener 5 of the belt 1, and ground the other end of the ground wire.
Also, the surface fastener 4' of the belt 1 and the surface fastener 4 are engaged.

The static electricity accumulated in the human body reaches the clasp 5 from the seam of the thread 2 made of copper-adsorbing fiber that comes into contact with the wrist.
It is then grounded via a ground wire.

To remove the wrist strap, simply disengage the hook-and-loop fastener 4' and the hook-and-loop fastener 4, and if necessary, remove the ground wire from the fastener 5 of the belt 1.

Example Next, embodiments of the present invention will be described based on the drawings.

Embodiment 1 FIG. 1 is a perspective view showing an example of a human body grounding device in which a grounding wire is attached to a wrist strap of the present invention.

A woven fabric belt 1 made of colored nylon monofilament yarn with a length of 20 cm, a width of 2 cm, and a thickness of 0.7 mm is prepared and layered in two layers, and a thread 2 made of acrylic copper-adsorbing fiber is used to wrap the belt 1 around it once. Then, sewing was performed in a straight line along the edge of the belt, followed by sewing in a zigzag manner between these seams. Further, prior to the sewing, a hook-and-loop fastener 4' was attached to one end of one side of the belt 1, and a corresponding hook-and-loop fastener 4 was attached to the other end of the opposite side.

A fastener (male metal hook) 5 was attached using the thread 2 to the surface opposite to the one end to which the hook-and-loop fastener 4' was attached, in order to connect a ground wire 6, which will be described later. (The clasp 5 is hidden behind one end of the ground wire 6 in the figure.) In the end, in this wrist strap, from the clasp 5 to the other end of the belt 1, This means that three seams of thread 2 are provided.

On the other hand, a thread 2 made of the same acrylic copper-adsorbing fiber as described above was sewn along both ends of a flat tape 3 made of colored nylon monofilament thread with a length of 1 m, a width of 0.5 cm, and a thickness of 0.5 mm. I set it as ground wire 6. A female hook was attached to one end of the ground wire 6 using the thread 2, and a metal clip 7 was attached to the other end.

The total weight of the human body grounding device, which connects the wrist strap and the grounding wire 6 with a hook, is only 10 g (approximately 1/3 of the weight of conventional human body grounding devices), and its flexibility, breathability, and fashionability. This made it possible to provide comfort to the workers. Also, the conductivity between both ends of this human body grounding device is determined by the surface resistance value.
10 ⁵ Ω, showing optimal conductivity as a human body grounding device.

Embodiment 2 FIG. 2 is a perspective view showing another example of the human body grounding device in which a grounding wire is attached to the wrist strap of the present invention.

Example 1 using an acrylic/nylon/rayon nonwoven fabric belt 1 with a length of 21 cm, a width of 3 cm, and a thickness of 1 mm.
A wrist strap was made in the same manner as above, and a string-like wrist strap with a thickness of about 1.2 mm and a length of 1.5 m was made by twisting 10 colored nylon monofilament threads and 22 threads made of acrylic copper-absorbing fiber. Ground wire 6 was attached.

The human body grounding device thus obtained is even lighter than that of Example 1, and has a conductivity of approximately 10 ⁵ Ω.
It was a good thing.

Effects of the invention In the invention, the belt 1 made of woven fabric, non-woven fabric, felt, or knitted fabric is lightweight, flexible, and breathable, and can be colored in any color. On the other hand, since the extremely light copper-adsorbing fiber thread 2 plays the role of conducting electricity, the entire wrist strap is light, flexible, breathable, and colorful. Therefore, this wrist strap gives a good impression visually, and even when the wrist strap is actually worn while working, there is no discomfort or discomfort, and there is no reduction in work efficiency.

In addition, since the thread 2 made of copper-adsorbing fiber has an appropriate surface resistance value, there is no risk of overcurrent flowing even though it has conductivity.

In the present invention, surface fasteners 4' corresponding to one end side and the other end side in the longitudinal direction of the belt 1,
A fastener 5 is provided at one end of the belt 1 in the longitudinal direction to allow attachment and detachment of the ground wire 6.
Since this is provided, attachment to and detachment from the wrist, as well as attachment and detachment of the ground wire 6, can be done with a single touch.

In particular, when a plurality of stitches of thread 2 made of copper-adsorbing fiber are provided from the fastener 5 provided at one end of the belt 1 to the other end of the belt 1, the contact between the wrist strap and the wrist is improved. This makes it possible to prevent unexpected situations where the wrist strap is attached to the wrist but fails to achieve its intended purpose due to poor contact. Even if one of the straps is broken, continuity is maintained and reliability as a wrist strap is maintained.

In addition, the wrist strap of the present invention has the advantage of being hygienic as it can be washed and used repeatedly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a human body grounding device in which a grounding wire is attached to a wrist strap according to the present invention. FIG. 2 is a perspective view showing another example of a human body grounding device in which a grounding wire is attached to a wrist strap according to the present invention. 1...Belt, 2...Copper adsorption fiber thread, 3...
...tape, 4, 4'... hook-and-loop fastener, 5... fastener, 6... ground wire, 7... clip.

Claims (1)

[Claims for Utility Model Registration] 1. A lightweight, flexible, and breathable belt 1 made of woven fabric, nonwoven fabric, or knitted fabric, with a ground wire attached to and detached from one end of the belt in the longitudinal direction. A fastener 5 for attaching the belt 1 to the wrist and a hook-and-loop fastener 4' for attaching the belt 1 to the wrist are provided, and the other longitudinal end of the belt 1 engages with the hook-and-loop fastener 4' at the one end. A loop fastener 4 is provided, and copper ions are adsorbed onto the fibers having a cyano group from the fastener 5 provided at one end of the belt 1 to the other end of the belt 1, and then the fibers are ring-formed. A wrist strap for handling semiconductor devices having a structure in which at least one seam is formed by machine sewing the thread 2 made of the obtained copper-adsorbing fiber. 2 Thread 2 made of copper-adsorbing fiber is threaded from the fastener 5 provided on one end of the belt 1 toward the other end of the belt 1.
1. A wrist strap according to claim 1, which has a structure in which a plurality of seams are formed by sewing with a sewing machine.