JPH0222143Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to electric soldering irons, and more specifically, the invention relates to electric soldering irons, and more specifically, the electrostatic charges charged on the soldering iron user and the soldering iron itself can be used to remove semiconductor devices, etc. This invention relates to an electric soldering iron that has a structure that prevents electrostatic damage to electronic components and devices.

(Prior art) During soldering work for electronic components such as semiconductor elements and electronic equipment, static electricity charged on the worker
It is well known that electrostatic damage such as electrostatic damage and reduced reliability can be caused to the above-mentioned electronic components.

Conventionally, in order to prevent this electrostatic interference, for example, workers would wrap a wrist strap with a ground wire around their arm and ground it, or the tip of an electric soldering iron could be connected to the ground wire. Measures against static electricity, such as grounding, were taken.

(Problems to be Solved by the Invention) However, such electrostatic countermeasures have the following problems, and improvements have been desired.

That is, in the former case, it is necessary to connect a ground wire to the human body, which causes a significant decrease in work efficiency, especially for workers who are often away from their seats or workers in unspecified locations.

In the latter case, the main purpose of the ground wire is to eliminate current leakage from the soldering iron heating system, and it is not necessarily sufficient to eliminate static electricity from the human body. .

In this regard, recently, an electric soldering iron having a structure as shown in FIG. 3 has been devised (see, for example, Japanese Utility Model Application Publication No. 61-22260 and Japanese Utility Model Application Publication No. 58-119964).

The soldering iron has a structure in which a conductor part b is provided on the surface of a grip part a, and the conductor part b can be grounded from a ground wire c through a ground clip d,
Static electricity charged on the worker is discharged in the order of the conductor section b, the ground wire c, and the ground clip d. e is a soldering iron tip, f is a heater, g is a power cord, and h is a three-point plug.

By the way, static electricity that is charged on the worker's body is most likely to cause electrostatic damage, but with the recent development of electronic devices, the weak static electricity that occurs in the power cord g can also be ignored. Because of this, even in the structure of the soldering iron shown in Figure 3,
It was not perfect in terms of static electricity countermeasures, and there was room for further improvement.

(Means for Solving the Problems) The present invention has been made in view of the conventional problems, and the electric soldering iron of the present invention has a conductive portion provided on at least the surface portion of the grip portion. , the conductor part can be grounded via a ground wire, and a conductive coating is formed over the entire length of the power cord of the soldering iron, and the conductive coating can be grounded. It is characterized by the presence of

As the conductive coating material, for example, a conductive wire material knitted into a net shape is suitably used.

(Function) By providing a conductor part on at least the surface portion of the grip part and making it possible to ground the conductor part via a ground wire, static electricity charged on the worker can be removed from the conductor part and the ground wire. discharged through.

In addition, by forming a conductive coating over the entire length of the power cord of the soldering iron and making it possible to ground the conductive coating, it is possible to Any static electricity generated will be reliably discharged.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The electric soldering iron according to the present invention is shown in Figures 1 and 2.
As shown in the figure, the electric soldering iron is used for soldering work of electronic components such as semiconductor elements and electronic equipment, and has a tip portion 3 on the tip side of a main body 2 having a grip portion 1. In addition, a power cord 4 is connected to the rear end side, and the soldering iron as a whole has a structure to prevent electrostatic damage to the electronic components, electronic equipment, etc. due to static electricity.

The soldering iron tip section 3 includes a soldering iron tip 5 and a heater 6 as main parts. protected.
Also, a mounting flange 7 is attached to the base end of the protection pipe 7.
a, which is attached to the nipple 9 of the main body 2 with a metal cap nut 8. 10
1 is a fixing pipe for fixing the soldering tip 5;
1 is a fixed pipe receiver.

The heater 6 heats the iron tip 5, and is provided with a sensor section 6a for detecting the temperature of the iron tip 5 and a heater section 6b at its tip. Further, a base end portion of the heater 6 is connected to a connector 12 of the main body 2. Wirings 13a, 13b for the heater section and wirings 14a, 14b for the sensor section are pulled out from the connector 12, and these are connected to the respective wirings 4a, 4 of the power cord 4 at the terminal 15.
b, 4c, and 4d.

The power cord 4 is a 5-core silicon cord, and includes, in addition to the four wires 4a to 4d, a ground wire 16 for grounding the heating system of the tip 5. .

That is, an earth spring 17 is interposed on the outer circumference of the connector 12, and the front end of the earth spring 17 is connected to the soldering tip 5 via the protective pipe 17, and the rear end is connected to the earth wire 16. ing.

The DIN plug 1 is attached to the base end of the power cord 4 above.
8 is attached and can be plugged into a power outlet (not shown). 19
is a cord bushing for holding and fixing the power cord 4 to the main body 2.

The main body 2 is made of plastic and has a cylindrical shape, and its outer periphery serves as the grip portion 1, and the terminal 12 and the like are housed inside the main body 2.

A conductor portion 20 is provided on the surface of the grip portion 1, and the conductor portion 20 can be grounded via the ground wire 16.

The conductor section 20 is provided on the entire surface of the grip section 1 to ground static electricity from the fingers that grip the grip section 1 . As the conductor portion 20,
For example, the entire surface of the grip portion 4 may be coated with a conductive resin or conductive coating, or a conductive material or the like may be inserted into the grip portion 4 during molding of the main body 2.
Alternatively, the main body 2 itself is formed of a conductive material.

The conductor section 20 and the ground wire 16 are connected via a conductive screw 21 screwed onto the grip section 1 and an auxiliary ground wire 22 .

Note that, as in the illustrated example, when the ground wire 16 serves both the ground from the heating system and the ground of the conductor portion 20, it is preferable that a protective resistor (not shown) of about 1 MΩ is provided in the middle of the wiring.

Further, the surface of the power cord 4 is coated with a conductive coating material 23 over its entire length. The conductive coating material 23 is for discharging static electricity generated on the surface of the power cord 4.
The base end of 3 can be grounded via the DIN plug 18. The conductive coating material 23 is specifically a conductive wire material knitted into a net shape, but in addition to this, a conductive material coating that completely covers the surface of the power cord 4 may be used.

Therefore, when the electric soldering iron configured as described above is used to solder electronic devices, etc., when the DIN plug 18 is inserted into the power outlet, the entire electric soldering iron is grounded. become.

Therefore, when a worker works while holding the conductor part 20 of the grip part 1 of the soldering iron, the static electricity charged on the worker is transferred to the conductor part 20 and the ground wire 1.
6. Discharge occurs through the DIN plug 18 and the power outlet, completely preventing static electricity from the human body from being applied to electronic components such as semiconductor devices and electronic equipment.

Further, static electricity generated on the surface of the power cord 4 during the soldering work is also discharged through the conductive coating 23, the DIN plug 18, and the power outlet.

Note that the present invention is not limited to the illustrated example,
Various design changes are possible; for example, if the location where the conductor portion 20 of the grip portion 1 is provided is the position where the fingers operating the soldering iron touch, that is, at least the surface portion of the grip portion 1, In addition to the entire surface, it can be changed as necessary, such as providing it partially at multiple locations.

(Effects of the invention) As described in detail above, according to the invention, a conductor part is provided on at least the surface portion of the grip part, the conductor part can be grounded via a ground wire, and The surface of the power cord of the iron is coated with a conductive coating over the entire length, and the conductive coating can be grounded, so it has the following effects, and is particularly useful for semiconductor devices, etc. It is possible to provide an electric soldering iron that is ideal for soldering work such as electronic components and electronic devices.

(a) Since the entire soldering iron, including the surface of the grip and the surface of the power cord, is grounded, not only the static electricity of the human body, which is the most likely to cause electrostatic damage, but also the weak static electricity generated on the power cord. It can also be completely discharged, which is extremely advantageous especially for soldering work on electronic parts and electronic devices that are susceptible to static electricity damage even by weak static electricity.

(b) Since there is no need to connect a ground wire to the human body, workers can move freely without being restricted by the ground wire when leaving their seats or moving, especially for workers who often leave their seats or in unspecified locations. For workers, work efficiency can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an electric soldering iron which is an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view of a conventional electric soldering iron. DESCRIPTION OF SYMBOLS 1... Grip part, 4... Power cord, 16... Earth wire, 20... Conductor part, 23... Conductive coating material.

Claims (1)

[Claims for Utility Model Registration] (1) A conductor is provided on at least the surface of the grip, and the conductor can be grounded via a ground wire, and the surface of the power cord of the soldering iron. An electric soldering iron characterized in that a conductive coating material is formed over the entire length, and the conductive coating material can be grounded. (2) The electric soldering iron according to claim 1, wherein the conductive coating material is a conductive wire material braided into a net shape.