JP2000068028A - Discharge gap device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce a discharge portion by increasing soldering adhesion amount to a conductor constituting a discharge gap. SOLUTION: In constituting a discharge gap device where a first side conductor 6a, connected with a first side circuit for generating high voltage and a second side conductor 6b connected with a second side circuit for absorbing the high voltage are arranged on a wiring substrate 11 spaced each other, and the spaced portion is used as a discharge gap 6, the first side conductor 6a and the second side conductor 6b are formed into a bifurcate shape, and the both ends of each of these conductors 6a, 6b are respectively projected from through-holes 11a drilled in series on the wiring substrate 11. A solder 16 is provided for each of the projections 14a, 14b, 15a, 15b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge gap device for generating a discharge between conductors, and more particularly, to a lightning strike countermeasure for an electric device such as a television receiver and a television-integrated video cassette recorder (TVCR). And a discharge gap device for reducing noise of a power supply circuit.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a discharge gap constituting a discharge gap device provided in electric equipment (see Japanese Patent Application No. 09-359115). This discharge gap is provided with solder lands 23, 23 to which solder 25 can be attached at the tips of a pair of copper foils 22, 22 facing each other at a predetermined interval on the wiring board 21. Auxiliary lands 24, 24 for pulling the solder 25 backward by surface tension are provided on the copper foils 22, 22 following the solder lands 23, 23. As a result, the copper foils 22, 22 that generate electric discharge
Is strengthened by the solder 25.

[0003]

However, in the above-described conventional discharge gap, the solder lands 23, 23 are provided at the tips of the pair of copper foils 22, 22, while the rear copper foils 22, 23 are provided.
Auxiliary lands 24 are formed on the base 22 so that the solder 25 is raised.
The thickness of the solder 25 was limited because it was only directly attached on the substrates 2 and 22 by dip. For this reason, the strength of the copper foils 22 cannot be increased to a certain level or more, and when a discharge occurs, the solder 25 evaporates and disappears, and the discharge gap cannot be used continuously. The problem remained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a discharge gap device which increases the amount of solder adhering to a conductor constituting a discharge gap to strengthen a discharge portion. And

[0005]

According to a first aspect of the present invention, there is provided a primary conductor connected to a primary circuit for generating a high voltage; And a secondary conductor connected to a secondary circuit that absorbs heat is disposed on the wiring board so as to be separated from each other, and the separated portion is used as a discharge gap. Side conductors are formed in a bifurcated shape, and both ends of each of the conductors are projected from through holes formed in a row on the wiring board, and solder is provided on each of the projections. The invention according to claim 2 of the present invention is characterized in that the protruding portions of the conductors are formed by bending only the opposing inner protruding portions outward, respectively. In the invention according to claim 3 of the present invention, the protrusions of the conductors are formed by bending the opposing inner protrusions inward and the outer protrusions outward. It is characterized by the following. The invention according to claim 4 of the present invention is characterized in that the primary conductor and the secondary conductor are copper-plated wires.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an electric circuit diagram showing an example in which a discharge gap device according to the present invention is used in a television receiver. This discharge gap device 5
Is provided in AV equipment such as a television receiver and a TVCR to protect these AV equipment from high voltage due to lightning strike and reduce noise generated in a power supply circuit.

In this power supply circuit, a primary power supply side A and a secondary power supply side B are connected by a switching power supply circuit 3, and a discharge gap 6 is provided between the two power supply sides A and B. That is, the rectifier circuit 2 is connected to the commercial power supply 1 on the primary power supply side A, and the rectifier circuit 2 is connected to the switching power supply circuit 3 via the capacitor C. A primary electrode 6 of a discharge gap 6 is provided between the commercial power source 1 and the rectifier circuit 2.
a is connected. The tuner 4 is connected to the secondary electrode 6b of the discharge gap 6 via the diode 7 and the ground E4. E1 is a rectifier circuit 2
, E2 is the ground of the capacitor, E3 is the ground of the switching power supply circuit 3, and E5 is the ground of the tuner 4.

Thus, the discharge gap 6 of the discharge gap device 5 is normally in a non-conductive state, so that the commercial power supply 1 on the primary power supply side A and the tuner 4 on the secondary power supply side B are insulated. For this reason, a high voltage is applied from the antenna (not shown) due to lightning strike or the like from the antenna input terminal 4 of the tuner 4.
a, the discharge gap 6 connected to the tuner 4 becomes conductive by discharge, and
Release high voltage. Therefore, since this high voltage does not flow into each load circuit side of the product, their destruction is prevented. Discharge gap device 5 having such action
Is mounted on a printed circuit board constituting an electronic circuit of the television receiver.

Next, regarding the production of this discharge gap,
This will be described with reference to FIGS. This discharge gap 6
Is to form a primary electrode 6a and a secondary electrode 6b by attaching copper plating wires 14 and 15 to copper foil patterns 12 and 13 on a printed circuit board 11 and attaching solder 16 to the copper plating wires 14 and 15, respectively. It has become. The printed circuit board 11 forms a pair of copper foils 12 and 13 with a predetermined gap (gap) G corresponding to the discharge voltage on the surface side.
13, through holes 11 for inserting copper plated wires 14, 15
a and 11a are respectively formed in a line. The pair of copper foils 12 and 13 are formed such that each of the opposing ends has an acute angle and the gap G
Discharge is easily caused. In addition, each copper foil 12,1
Lead wires (not shown) are respectively joined to the rear ends of 3.

The copper-plated wires 14 and 15 are
13 is used to make it easier to attach solder 16 to
It is bent in advance into a substantially U-shaped bifurcated shape, and each is slightly bent inward at both ends. This copper plated wire 14,
Reference numeral 15 denotes an automatic mounting machine that inserts each end into each of the two through-holes 11a from the back side of the printed circuit board 11 and protrudes toward the front side. Then, on the upper surfaces of the pair of copper foils 12 and 13, each protruding portion 14a, 14b, 15a, 15b
The opposing inner protrusions 14a and 15a are bent outward, and the outer protrusions 14b and 15b are bent inward. For this reason, the copper plated wires 14 and 15 are
Never fall off. Thereafter, the printed circuit board 11 is dipped and soldered. At this time, the copper foil 12,1
Copper plated wires 14, 15 having good affinity with solder on the upper surface of 3
Are projected, the copper foil 1
Solder 1 compared to solder dip directly on 2, 13
6 is increased, and the solder 16 is raised at the tip ends of the copper foils 12 and 13. Thereby, the strength of each of the copper foils 12 and 13 is increased, and the evaporation of the solder 16 when a discharge occurs in the gap G of the discharge gap 6 is suppressed. Accordingly, the disappearance of the solder on the copper foils 12 and 13 during the discharge is avoided, so that the discharge gap 6 can be continuously used.

FIG. 5 is a longitudinal sectional view showing a modification of the discharge gap. This discharge gap has the same basic configuration as that of the above-described embodiment, and the inner projections 14a, 15a of the copper plating wires 14, 15 which are opposed to each other are formed inside the projections 14a, 14b, 15a, 15b. The outer projections 14b and 15b are bent outward. When the copper plating wires 14 and 15 are inserted into the respective ends and made to protrude toward the front side, the respective protruding portions 14a to 15
b indicates a state in which the opposing inner protrusions 14a and 15a are bent inward and the outer protrusions 14b and 15b are bent outward. Also in this case, the copper plated wires 14 and 15 do not fall out of the through holes 11a, and especially when the solder is dipped and soldered, the respective protruding portions 14a and 15
Due to the presence of a, the amount of solder attached to the copper foils 12 and 13 increases. Therefore, the swelling of the solder 16 on each tip side of the copper foils 12 and 13 is further increased. For this reason, the strength of each of the copper foils 12 and 13 is increased, the evaporation of the solder 16 during discharge is suppressed, and the discharge gap 6 can be used for a long time as in the above-described embodiment. In the above embodiment, the structure in which the discharge gap device 5 is interposed between the commercial power source 1 of the television receiver and the tuner 4 side has been described, but the mounting position of the discharge gap device is not limited to this. Instead, it may be provided between a commercial power supply and a circuit (secondary circuit) connected to the secondary power supply as a countermeasure against lightning strike.

[0012]

As described above, according to the first aspect of the present invention, the primary conductor and the secondary conductor used for the discharge gap are formed in a bifurcated shape, and are arranged in a row on the wiring board. Since solder is provided at each protruding portion at both ends inserted and protruded from the through hole, the amount of solder attached is larger than when soldering directly on the conductor as before, so the discharge gap Is increased, the evaporation of the solder when a discharge occurs is suppressed, and the loss of the solder is avoided, so that there is an effect that the discharge gap can be repeatedly used. In the invention according to claim 2 of the present invention, since only the inner protrusions opposed to the protrusions of the respective conductors are bent outward, respectively, the protrusions from the through holes on the wiring substrate There is an advantage that the discharge gap is strengthened because it is difficult to fall off and the solder can be attached so as to rise. In the invention according to claim 3 of the present invention, each of the conductors is bent such that the inner protrusions facing each other are bent inward and the outer protrusions are bent outward. Therefore, there is an advantage that the amount of solder attached to the tip portion close to the gap can be further increased, and the strength of the discharge gap can be further increased. In the invention according to claim 4 of the present invention, since the primary side conductor and the secondary side conductor are copper-plated wires having excellent affinity with solder, the invention is applied to a case where solder is applied by dip. It has the effect of being homogeneous and appropriate.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing an example in which a discharge gap device according to an embodiment of the present invention is used in a television.

FIG. 2 is a plan view showing a discharge gap.

FIG. 3 is a vertical sectional side view showing a discharge gap.

FIG. 4 is a longitudinal sectional view showing a discharge gap.

FIG. 5 is a vertical side view showing a modified example of a discharge gap.

FIG. 6 is a vertical side view showing a conventional discharge gap.

[Explanation of symbols]

 6 Discharge gap 6a Primary conductor 6b Secondary conductor 11 Wiring board 11a Through hole 14a Projection 14b Projection 15a Projection 15b Projection 16 Solder

Claims (4)

[Claims] 1. A primary conductor connected to a primary circuit generating a high voltage and a secondary conductor connected to a secondary circuit absorbing a high voltage are separated from each other on a wiring board. In the discharge gap device using the separated portion as a discharge gap, the primary conductor and the secondary conductor are formed in a forked shape, and both ends of each conductor are lined up on a wiring board in a line. A discharge gap device, wherein each of the projections protrudes from the provided through-hole, and solder is provided on each of the projections. 2. The discharge gap device according to claim 1, wherein the protrusions of each conductor are formed by bending only the respective inner protrusions facing each other outward. 3. The projecting portion of each of the conductors according to claim 1, wherein the projecting portions on the inside facing each other are bent inward, and the projecting portions on the outside are bent outward. Discharge gap device. 4. The discharge gap device according to claim 1, wherein the primary conductor and the secondary conductor are copper-plated wires.