KR960016778B1 - Surge absorber of gap type - Google Patents

Abstract

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Description

Gap Surge Absorbers

1 is an overall perspective view showing a cut out part of an embodiment of the surge absorbing element described in claim 1;

2 is an exploded perspective view showing a manufacturing process of an embodiment of the surge absorbing element described in claim 1;

3 is a longitudinal sectional view showing a manufacturing process of an embodiment of the surge absorbing element described in claim 1;

4 is a plan view showing an embodiment of the surge absorbing element described in claim 1;

5 is an overall perspective view showing a cut-out part of the surge absorbing element described in claim 2 or 3 of the claims.

6 is an exploded perspective view showing a manufacturing process of an embodiment of the surge absorbing device according to claim 2 or 3 of the claims.

* Explanation of symbols for main parts of the drawings

10,30: surge absorbing element 12c, 12d, 32e, 32f: insulator

14a, 14b: discharge electrode 16: discharge gap

18,36: through hole 38: axis of through hole

40c, 40d: Trigger discharge part

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gap type surge absorbing element for protecting an electronic component or a human body from overvoltage such as thunder surge, open / close surge, and static electricity.

As a conventional gap type surge absorbing element, a conductive thin film is deposited on an insulator such as a flat plate or columnar murite cerami cs, and the conductive thin film is divided by a laser beam to form a discharge gap of about 50 μm. For example, Special Publication 56-44547)

However, in the conventional gap type surge absorbing element, the creepage distance between discharge electrodes is almost equal to the length of the discharge gap. Therefore, due to sparking of the electrode material due to the discharge, the electrode material is attached to the insulator of the creepage distance, and thus there is a problem that the discharge characteristics are easily deteriorated.

It is therefore an object of the present invention to provide a gap type surge absorbing element for suppressing deterioration due to discharge.

In the gap type surge absorbing device according to claim 1 (hereinafter referred to as "claim"), a discharge electrode is sandwiched between two insulators, and a through hole including a discharge gap of the discharge electrode is formed in the insulator.

The gap type surge absorbing element of claim 2 is a gap type surge absorbing element of claim 1, wherein a through hole axis is formed on a surface of the two insulators that sandwiches the discharge electrodes.

The gap type surge absorption element according to claim 3 is a gap type surge absorption element according to claim 1 or 2, wherein a trigger discharge portion having a small diameter is formed in a part of the through hole.

According to the gap type surge absorption element according to claims 1 to 3, a through hole including a discharge gap is formed in the insulator, so that a discharge gap can be formed by introducing a laser beam into the through hole. Through-holes are formed in the insulator around the discharge gap, and the creepage distance between the discharge electrodes becomes the peripheral length of the through-holes.

According to the gap type surge absorbing device according to claim 2, the surface sandwiching the discharge electrodes of the two insulators is divided by through holes.

According to the gap type surge absorption device according to claim 3, trigger discharge occurs in the trigger discharge portion. 1 to 4 show one embodiment of the gap type surge absorbing element (hereinafter referred to as "surge absorbing element") described in claim 1, and a part of FIG. 1 is an overall perspective view, and FIG. 2 is a manufacturing process A partly exploded perspective view showing part, and FIG. 3 is a longitudinal sectional view showing part of a manufacturing process. 4 is a plan view. Hereinafter, these drawings will be described in detail.

In addition, in these figures, the length of the discharge gap was enlarged than other parts for the convenience of explanation.

In the surge absorbing element 10, a through hole 18 including the discharge gap 16 of the discharge electrodes 14a and 14b is formed in the insulators 12c and 12d between the insulators 12c and 12d.

The insulators 12c and 12d are made of synthetic resin, ceramics, and the like, and grooves 22c and 22d for holding the discharge electrodes 14a and 14b are formed in the fixing surfaces 20c and 20d, respectively. The discharge electrodes 14a and 14b are formed of rod-shaped conductors 24 such as tin mech copper lines and the other ends thereof are connection terminals 26a and 26b.

The connection terminals 26a and 26b are soldered and connected to a printed wiring board or the like.

The manufacturing method of the surge absorbing element 10 will be described.

An adhesive or the like (not shown) is applied to the fixing surfaces 20c and 20d of the insulators 12c and 12d to sandwich the conductors 24 between the insulators 12c and 12d.

As shown in FIG. 3, the laser beam b is introduced into the through hole 18 by a laser oscillator La such as a YAG laser or a carbon dioxide laser and irradiated to the conductor 24.

Then, the conductors 24 are vaporized to form the discharge electrodes 14a and 14b and the discharge gap 16. Since the through holes 18 including the discharge gaps 16 are formed in the insulators 12c and 12d, the laser beams b can be introduced into the through holes 18 to form the discharge gaps 16. There is also.

In the surge absorbing element 10, the discharge electrodes 14a and 14b and the discharge gap 16 are formed in the insulators 12c and 12d, so that the discharge electrodes 14a and 14b and the discharge gap 16 are protected. . Therefore, no package is needed.

However, the lid may be covered with a ceramic or the like as a lid is provided in the through hole 18.

Or the structure which enclosed desired gas in the package may be sufficient.

The operation of the surge absorption element 10 will be described.

The through holes 18 are drilled in the insulators 12c and 12d around the discharge gap 16 so that the creepage distance D between the discharge electrodes 14a and 14b becomes the length of the peripheral edge of the through hole 18. When discharge occurs in the discharge gap 16, the material of the discharge electrodes 14a and 14b splashes and adheres to the insulators 12c and 12d at the creepage distance D due to sparking. However, since the creepage distance D is large, the deposition amount of the electrode material per unit area can at least suppress deterioration in discharge characteristics.

It demonstrates as a numerical value again concretely.

The diameter W1 of the conductor 24 is 0.3-1.0 mm, the length L of the discharge gap 16 is 30-100 micrometers, and the width W2 of the through hole 18 is 1-3 mm.

5 and 6 show one embodiment of the surge absorbing element according to claim 2 or 3, and FIG. 5 is an exploded perspective view showing part of the manufacturing process, and FIG.

Hereinafter, these drawings will be described in detail. However, the same parts as in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof will be omitted. And these figures enlarge the discharge gap length more than the other parts for the sake of explanation.

The surge absorbing element 30 is formed by the axis 38 of the through hole 36 on the fixing surfaces 34e and 34f which sandwich the two insulators 32e and 32f and the discharge electrodes 14a and 14b. have.

In a part of the through hole 38, a trigger discharge portion 40c, 40d having a small diameter is formed. Grooves 42e and 42f for holding the discharge electrodes 14a and 14b are formed in the fixing surfaces 34e and 34f. Silver and lead lamps (not shown) are applied to the fixing surfaces 34e and 24f of the insulators 32e and 32f to sandwich the conductors 24 between the insulators 32e and 32f as shown in FIG.

Similarly to the surge absorbing element 10, the discharge electrodes 14a and 14b and the discharge gap 16 are formed by laser light.

In the fixing surfaces 34e and 34f, the portions in contact with the discharge electrodes 14a and the portions in contact with the discharge electrodes 14b are divided by the through holes 36, respectively.

Therefore, even if silver, lead, or other conductive material is applied to the fixing surfaces 34e and 34f, there is no short circuit between the discharge electrodes 14a and 14b. The trigger discharge parts 40c and 40d cause the trigger discharge by the creepage discharge of the high frequency component.

Therefore, the discharge characteristics can be improved by varying the shape or dimensions of the trigger discharge portions 40c and 40d. For example, the diameters of the trigger discharge parts 40c and 40d are 1 mm or less.

In this case, the diameter of the through hole 36 is at most 2-3 mm.

The surge absorbing element described above shows a structure in which one pair of electrodes is provided in one through hole, but three electrodes in one through hole or multiple pairs of electrodes in one through hole may be used. .

According to the surge absorbing element according to claims 1 to 3, since the through hole is formed in the insulator around the discharge gap, the creepage distance between the discharge electrodes becomes the length of the peripheral edge of the through hole, so that the creepage distance can be increased and the deterioration caused by discharge Can be suppressed.

According to the surge absorbing element according to claim 2, since the surface sandwiching the discharge electrode is divided by the through hole, a short circuit between the discharge electrodes can be prevented even when the discharge electrode is sandwiched by using a conductive material.

According to the surge absorbing element described in claim 3, the trigger discharge portion can generate trigger discharge, and the discharge characteristic can be improved.

Claims (3)

A gap-type surge absorbing element in which a discharge electrode is sandwiched between two insulators and a through hole including a discharge gap of the discharge electrode is formed in the insulator. The gap type surge absorbing element according to claim 1, wherein an axis of the through hole is formed on a surface of the two insulators that sandwiches the discharge electrodes. The gap type surge absorption element according to claim 1 or 2, wherein a small diameter trigger discharge portion is formed in a part of the through hole.