JP2004296293A - Discharge device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size and the cost and to stably and surely discharge a surge current. <P>SOLUTION: A pair of metal pins 12a and 12b are installed by inserting them into a base member 11 formed of a nonconductive material, and the metal pins 12a and 12b are formed by bending them in directions so as to face them to each other on the side opposite to an electronic circuit board 50 with respect to the base member 11. Then, the metal pins 12a and 12b are brought into a confronted form with each other through a space A of a predetermined distance, and a surge current generated in an electronic circuit formed on the circuit board 50 is discharged by using the space part as a discharge gap. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a discharge device for discharging a surge current generated in an electronic circuit formed on an electronic circuit board.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various electric and electronic devices are equipped with electronic circuits for processing information and controlling the devices. Generally, such an electronic circuit is formed by forming a wiring pattern on a circuit board made of a non-conductive material such as polycarbonate, and attaching an electronic component such as a semiconductor chip to the wiring pattern. Incidentally, such an electronic component is very vulnerable to an excessive current, and thus may be damaged by a surge current generated by, for example, lightning.
[0003]
Therefore, a conventional circuit board is provided with a discharge gap portion 100 in which wirings are formed in a pattern facing each other with a minute interval B, as shown in FIG. 4, for example. By discharging the surge current in the discharge gap portion 100, the electronic component is prevented from being damaged by, for example, a lightning surge.
[0004]
Instead of providing such a discharge gap portion 100, for example, a surge absorber having a structure disclosed in Japanese Patent Application Laid-Open No. 2001-134248 or a device disclosed in Japanese Patent Application Laid-Open No. 2002-246141 can be used. It has also been proposed to discharge a surge current by attaching an arrestor device having a structure to an electronic circuit.
[0005]
Further, as a discharge device intended to be attached to a relatively large electric device, for example, a spark discharge gap as disclosed in JP-A-2001-006839 and JP-A-2001-135451 has been proposed. I have.
[0006]
[Problems to be solved by the invention]
By the way, the discharge gap portion 100 having the structure shown in FIG. 4 has a problem that the stability of discharge is lacking, and a lightning surge is not appropriately discharged, and electronic components mounted on a circuit board may be damaged. was there.
[0007]
In addition, since conventional surge absorbers and arrester devices are relatively expensive, there is a problem in that it is difficult to mount them on electronic devices that require low cost.
[0008]
Further, since a discharge device such as the above-described spark discharge gap is intended to be attached to a relatively large electric device driven by high power, the discharge device is large in size, and is mounted on an electronic circuit board on which a semiconductor chip or the like is provided. Not suitable for mounting. Therefore, there has been a problem that it is difficult to mount it on a small electronic device such as a portable telephone or a portable information terminal.
[0009]
Accordingly, the present invention has been made in view of the above-mentioned conventional circumstances, and is suitable for mounting on an electronic circuit board. The discharge device is small in size and low in cost, and can discharge stably. The purpose is to provide.
[0010]
[Means for Solving the Problems]
A discharge device according to claim 1 of the present invention is a discharge device for discharging a surge current generated in an electronic circuit formed on an electronic circuit board, the discharge device being formed of a non-conductive material and disposed on the electronic circuit board. A base member, which is inserted through the base member and is electrically connected to the electronic circuit, and faces each other with a predetermined distance from the base member on a side opposite to the electronic circuit board. And a pair of metal pins bent in the direction.
[0011]
In the discharge device according to the first aspect of the present invention, the pair of metal pins can be connected to the electronic circuit via the base member, and a gap between the pair of metal pins is used as a discharge gap. Thus, a surge current generated in the electronic circuit can be discharged. Further, since the structure is relatively simple, it is possible to reduce the size and cost.
[0012]
According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the pair of metal pins is inserted into a hole formed in the electric circuit board, and a back side of the electronic circuit board. And being connected to the electronic circuit by being soldered to the electronic circuit.
[0013]
In the discharge device according to the second aspect of the present invention, the pair of metal pins are electrically connected and fixed by being soldered on the back side through the electronic circuit board. Therefore, not only can the connection to the electronic circuit be more secure, but also the strength of mounting the discharge device to the electronic circuit board can be improved.
[0014]
The discharge device according to claim 3 of the present invention is characterized in that, in addition to the configuration according to claim 1, at least one of the pair of metal pins is formed in a pointed shape at the tip portions facing each other. It is assumed that.
[0015]
In the discharge device according to claim 3 of the present invention having the above-described configuration, at least one of the pair of metal pins is formed in a pointed shape at the end portions facing each other, so that the gap between the pair of metal pins is formed. It is possible to improve the discharge characteristics in the part, and thereby, it is possible to reliably discharge the surge current generated in the electronic circuit.
[0016]
The discharge device according to claim 4 of the present invention, in addition to the configuration according to claim 1, wherein the base member is formed at a height at least in contact with a bent portion of the pair of metal pins, and A notch is formed to make the metal pin face outward at a position near the gap.
[0017]
In the discharge device according to claim 4 of the present invention having the above-described configuration, since the base member is configured to contact at least the bottom of the pair of metal pins, the pair of metal pins can be stably held by the base member. Can be fixedly supported. Thereby, even when, for example, a physical impact is applied from the outside, it is possible to prevent the pair of metal pins from being twisted or deformed. In addition, since the gap between the metal pins faces outward due to the notch, the discharge characteristics in the gap are not impaired.
[0018]
The discharge device according to claim 5 of the present invention, in addition to the configuration according to claim 4, wherein the base member has a bent main surface of the pair of metal pins on a main surface on which the pair of metal pins bend. A part is fitted to form a groove for fixing and supporting the part.
[0019]
In the discharge device according to claim 5 configured as described above, since the pair of metal pins is fixed in a state of being partially embedded in the groove of the base member, the pair of metal pins is more stably fixed and supported. be able to.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, the discharge device 10 having the structure shown in FIG. 1 will be described.
[0021]
As shown in FIG. 1, the discharge device 10 includes a rectangular parallelepiped base member 11 formed of a non-conductive material, and a pair of metal pins 12 a and 12 b inserted through the base member 11.
[0022]
The base member 11 is used by being attached to the main surface of the electronic circuit board 50 as shown in FIG. Further, the base member 11 is formed by, for example, molding various resin materials, and is similar to other electronic components attached to the electronic circuit board 50, for example, a semiconductor chip, a resistor, a capacitor, or the like. It is large.
[0023]
The pair of metal pins 12a and 12b are respectively inserted into both end positions of the base member 11, and are separated from the base member 11 by a predetermined distance A (discharge gap) on the side opposite to the electronic circuit board 50. And are bent in directions facing each other.
[0024]
The metal pins 12a and 12b are attached to the base member 11 in a state where the metal pins 12a and 12b are inserted through the base member 11 and protrude by a predetermined length to the back surface side of the electronic circuit board 50. As shown in FIG. It is pulled out to the back side through a hole (not shown) formed in the circuit board 50, and solder 51 is applied on the back side to be electrically connected to the wiring pattern of the electronic circuit.
[0025]
As described above, the discharge device 10 is configured such that the pair of metal pins 12a and 12b are connected to the electronic circuit via the base member 11. Then, the discharge device 10 discharges a surge current generated in the electronic circuit by using a gap where the pair of metal pins 12a and 12b face each other as a discharge gap.
[0026]
Here, the discharge device 10 includes only the base member 11 and the pair of metal pins 12a and 12b, and has a relatively simple structure, so that it is easy to reduce the size and cost.
[0027]
In the discharge device 10, the interval between the discharge gaps (the distance A between the metal pins 12a and 12b in the gap portion) can be set arbitrarily. Can be reliably discharged.
[0028]
In the above description, the metal pins 12a and 12b are soldered to the electronic circuit on the back side through the holes formed in the electronic circuit board 50. For example, the metal pins 12a and 12b may be , The discharge device 10 may be attached to the surface of the electronic circuit board 50 where the wiring pattern is formed, and connected to the wiring pattern on the attachment surface side.
[0029]
However, by soldering the metal pins 12a and 12b on the back side through the electronic circuit board, the mechanical connection strength between the metal pins 12a and 12b and the electronic circuit can be improved, and the electronic circuit of the discharge device 10 can be improved. The attachment strength to the substrate 50 can be improved.
[0030]
Further, it is desirable that at least one of the metal pins 12a and 12b is formed in a pointed shape at the end portions facing each other. Thus, the discharge characteristics in the discharge gap can be improved, and the surge current generated in the electronic circuit can be reliably discharged. Although FIGS. 1 and 2 show an example in which both of the pair of metal pins 12a and 12b are formed to have a pointed tip, such a configuration is used. Discharge characteristics can be further improved.
[0031]
Further, in the discharge device 10, the height from the base member 11 to the discharge gap may be arbitrarily set as long as it does not affect the discharge characteristics of the surge current in the discharge gap.
[0032]
Further, FIGS. 1 and 2 show an example in which a pair of metal pins 12a and 12b are formed on the main surface of the base member 11 in a standing state. For example, as shown in FIG. The groove 13 may be formed on the main surface of the member 11, and the metal pins 12 a and 12 b may be mounted in the groove 13 in a semi-embedded state. Thus, the metal pins 12a and 12b can be securely fixed and supported by the grooves 13 formed in the base member 11, and it is possible to prevent the metal pins 12a and 12b from being twisted or deformed. Further, even when, for example, a physical impact is applied from the outside, the discharge gap can be reliably maintained.
[0033]
In the example shown in FIG. 3, a cutout 14 is formed in the base member 11, and the discharge gap faces outward with the cutout 14. Therefore, the discharge characteristics in the discharge gap are not impaired.
[0034]
In the example shown in FIG. 3, the metal pins 12 a and 12 b are attached to the groove 13 formed in the base member 11 in a semi-embedded state, but the groove 13 is not formed, and the main surface of the base member 11 and the metal pin The metal pins 12a and 12b may be formed so that the bottoms of the metal pins 12a and 12b are in contact with the bottom of the metal pins 12a and 12b.
[0035]
【The invention's effect】
The discharge device according to the present invention can connect a pair of metal pins to an electronic circuit via a base member, and can use a gap portion facing the pair of metal pins as a discharge gap to generate a surge current generated in the electronic circuit. Can be discharged. Further, since the structure is relatively simple, it is possible to reduce the size and cost.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a discharge device shown as an embodiment of the present invention.
FIG. 2 is a side view showing a state where the discharge device is mounted on an electronic circuit board.
FIG. 3 is a schematic perspective view showing an example of a discharge device as another embodiment of the present invention.
FIG. 4 is an enlarged plan view of a main part showing an example of a discharge gap portion provided on a conventional circuit board.
[Explanation of symbols]
Reference Signs List 10 Discharge device 11 Base members 12a and 12b Metal pin 13 Groove 14 Notch

Claims (5)

In a discharge device that discharges a surge current generated in an electronic circuit formed on an electronic circuit board,
A base member formed of a non-conductive material and disposed on the electronic circuit board;
While being inserted into the base member, it is electrically connected to the electronic circuit, and is bent and formed in a direction facing the base member with a gap of a predetermined distance on the opposite side to the electronic circuit board. And a pair of metal pins. The pair of metal pins may be inserted into holes formed in the electric circuit board, and may be connected to the electronic circuit by being soldered to the electronic circuit on the back side of the electronic circuit board. The discharge device according to claim 1, characterized in that: 2. The discharge device according to claim 1, wherein at least one of the pair of metal pins is formed in a pointed shape at front ends facing each other. 3. The base member is formed at least at a height in contact with a bent portion of the pair of metal pins, and is formed with a notch that exposes the pair of metal pins outward at a position near the gap. The discharge device according to claim 1, wherein: The base member is characterized in that a bent portion of the pair of metal pins is fitted on a main surface on a side where the pair of metal pins bends, and a groove portion for fixing and supporting the portion is formed. The discharge device according to claim 4.

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