JPS6291046A - Static electricity absorption type handset - Google Patents

Abstract

PURPOSE:To eliminate static electricity charged on a human body by forming a part or all of a handset by a resin material of volume resistivity of 10<7>-10<10>OMEGA.cm and connecting the forming with an earth line of a semiconductor circuit driving a handset. CONSTITUTION:Since a part or all of the handset 7 is formed by a resin material having a volume resistivity of 10<7>-10<10>OMEGA.cm, the electricity is conducted slightly. When a user charged with static electricity grips the handset, the charged static electricity passes the handset slightly and flows to the earth line of the semiconductor circuit. Since the static electricity is flowed not in a short time as spark discharge, no unpleasant feeling is given to the user and the current due to the static electricity flows directly to the earth line, then destruction of the semiconductor circuit is precluded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a static electricity absorbing handset used in a handset housing a transmitter and receiver of a telephone, an intercom, and the like.

BACKGROUND OF THE INVENTION Conventionally, this type of hand cent has been constructed as shown in FIG. In FIG. 2, reference numeral 1 denotes a telephone receiver, which is attached to the handset 3 via an electrically insulating film 2 and held by a plate 4, and the telephone receiver 1 and the semiconductor circuit 6 are electrically connected, and the semiconductor It was constructed by providing a telephone line 6 from a circuit 5.

Problems to be Solved by the Invention With such a conventional configuration, the following problems occur when telephones and intercoms are used in dry regions or seasons. In other words, static electricity generated by the friction of chemical fibers such as clothes and carpets accumulates in the human body, and its value is 1.
It reaches several kilovolts.

If you pick up a telephone or intercom handset and put it to your ear in this state, an electric discharge will occur between your ear and a part of the handset inside the phone, causing discomfort to the user.
The discharge current may destroy semiconductor circuits. If this semiconductor circuit is destroyed, the functions of telephones and intercoms will be impaired, so Zener diodes and surge absorbers are built in for protection. However, there is a problem in that the user's discomfort is not alleviated because spark discharge occurs.

The present invention solves these problems, and aims to provide a method for removing static electricity from the human body without causing discomfort to the user and without adversely affecting semiconductor circuits. It is something.

Means for Solving the Problem In order to solve this problem, the present invention has the following features: Molding part or all of the bundle with a resin material having a volume resistivity of 10 to 10 Q"ttn, and connecting the molded part and the feeder. The configuration is such that it is connected to the ground line of the semiconductor circuit that drives the receiver.

Function: With this configuration, a portion or the whole is molded from a resin material having a volume resistivity of 10 to 1°Ω, so that it is in a state of slightly conducting electricity. That is, when a user who is charged with static electricity holds a handset, the charged static electricity flows little by little through the hand center to the ground line of the semiconductor circuit.

For this reason, static electricity does not flow in a short period of time like spark discharge, so it does not cause discomfort to the user, and there is no need to worry about damage to semiconductor circuits, as the current caused by static electricity flows directly through the ground line. It will disappear.

Embodiment FIG. 1 is a diagram illustrating the operation of a static electricity absorbing hand cent according to an embodiment of the present invention. In FIG. Consisting of circuit 6, by the user's hands,
- At the same time as holding the hand set 7, static electricity that has been charged is absorbed through the slightly conductive molded part 8 of the hand set.

The static electricity is then passed through a lead wire fixed to the conductive molded part 8 to the ground line of the semiconductor circuit 6 housed within the handset or the main body. Furthermore, it flows to the telephone line e.

Next, as a resin material for molding the handset, fine carbon powder was mixed and used as a material that slightly imparts conductivity to ABS resin. However, the amount of carbon is 5% by weight or less.

This material is used to mold all or part of the handset and assemble it into a finished product. When installing the handset and fixing the circuit board inside the handset, electrically connect the ground line to a part of the handset made of a material with a resistance of 107 to 1010 Ω·α. As a result, the resistance value between the ground line and the ground set surface is between 1oMΩ and 100
0MΩ was achieved.

Most resin materials such as polyurethane terephthalate and polycarbonate can be used as the molding material for this handset. In addition to fine carbon powder, fine metal powders such as copper, aluminum, and nickel, and conductive polymers such as polyacetylene can be used as materials that provide slight conductivity. Appropriate amounts of these resin materials and conductive substances are mixed, formed into a composite, and molded into the shape of a handset.

If a part of the hand pen is made of a conductive material, it must be used in a part that is always touched by the user. In addition, when connecting the handset and the ground line of the semiconductor circuit, take into account the variation in resistance value, and connect 1Ω in series between the ground line and the conductive part of the handset.
A resistor of about MΩ may be inserted.

However, if the volume resistivity of the molded resin material becomes 1QΩ・(7) or less, the resistance value between the surface of the handset and the ground line becomes too small, causing an instantaneous spark discharge when a charged user holds the handset, causing a malfunction. Gives pleasure. On the contrary, 10
For molding materials with a resistance of over 100 ohms, it takes time for the static electricity to flow away. When the earphone hits your ear, there is a possibility that the static electricity has not dissipated sufficiently, causing a spark discharge.

Effects of the Invention As described above, according to the present invention, the resistance between the ground line of the semiconductor circuit and the surface of the handset is from 10MΩ to 1MΩ.
The value becomes 000MΩ and no spark discharge occurs. Since the discharge occurs gradually, there is no discomfort to the user. Further, since it does not have any adverse effect on the semiconductor circuit, circuit elements such as Zener diodes and surge absorbers are not required, so the circuit configuration is simplified and the cost is reduced.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the operation of a static electricity absorbing hand cent according to an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional piezoelectric handset fixed to a handset via an insulating film. 7... No end set, 8... Conductive molded part. Name of agent: Patent attorney Toshio Nakao? td) 1 person Figure 1 Figure 2

Claims (1)

[Claims] Volume resistivity of part or all 10^7~10^1^0Ω
- A static electricity absorbing handset characterized by being molded from a resin material with a diameter of 1.5 cm and a semiconductor circuit connected to the resin material.