JPH0621236U - Capacitor with discharge gap and electrical connector using the same - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a capacitor with a discharge gap having a predetermined gap, which discharges at that portion and withstands a high voltage, and an electrical connector using the same. [Structure] A discharge gap a is formed between electrodes 2 and 4 at both ends of a chip capacitor 1 with a predetermined gap. Electrode 2,
One electrode 2 of 4 is surface-mounted on the signal conductor 42 of the electrical connector 30, and the other electrode 4 is surface-mounted on the grounding conductor 46. When a high-voltage current flows, the surfaces of the electrodes 2 and 4 are discharged in the discharge gap a to prevent the chip capacitor 1 from being destroyed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a capacitor, particularly a capacitor with a discharge gap, and an electrical connector using the same.

[0002]

[Prior art and its problems]

 2. Description of the Related Art Chip capacitors and the like are used to remove high frequency noise in electric connectors used in electronic devices such as automobile computers. As a conventional chip capacitor, for example, there is a chip capacitor 100 for an electric connector disclosed in Japanese Utility Model Laid-Open No. 4-35376 shown in FIG. This chip capacitor 100 has electrodes 102 and 104 at both ends. Each of the electrodes 102 and 104 is surface-mounted on an individual conductor 106 for a signal circuit and a common conductor 108 for grounding on a substrate 110.

This type of chip capacitor generally has a large gap between electrodes on both ends. When a high voltage current flows due to static electricity generated in the body of an automobile, this chip capacitor cannot withstand the high voltage and the inside is destroyed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a chip capacitor that is not broken even when a high voltage temporarily flows, and an electrical connector using the chip capacitor.

[0005]

[Means for solving the problem]

 The chip capacitor according to the present invention has electrodes at both ends and is a capacitor having a substantially uniform cross section, and has a discharge gap having a predetermined gap in the longitudinal direction of the outer surface of the capacitor.

Further, an electric connector using the electric connector is an electric connector having a signal terminal and a ground conductor, in which a capacitor having a substantially uniform cross section is connected between at least a part of the signal terminal and the ground conductor. A discharge gap having a predetermined gap is formed in the longitudinal direction of the outer surface of the capacitor.

[0007]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a perspective view of a chip capacitor 1 according to the present invention. The chip capacitor 1 is a rectangular parallelepiped having a substantially uniform cross section and has electrodes 2 and 4 at both ends. The dimensions are about 0.8 (W) × 0.8 (t) × 1.6 (L) mm. The electrodes 2 and 4 are formed by plating copper on the body of the chip capacitor 1 and then plating solder on it. Further, the electrodes 2 and 4 are coated with solder resists 6 and 8 so as to surround the electrodes 2 and 4, respectively. While the conventional gap between the electrodes is about 1.4 mm, the gap between the edges 10, 12 of the electrodes 2, 4 is about 0.2-0.3 mm, and this gap forms the discharge gap a. The discharge gap a can be set at an arbitrary interval in order to obtain desired withstand voltage characteristics. In this embodiment, it can withstand a high voltage of about 25 kv. The discharge gap a can be set to any interval according to the withstand voltage characteristics. The solder resist 6.8 may be provided only on the surface on which the chip capacitor 1 is soldered.

FIG. 2 shows a vertical sectional view of a preferred embodiment of the electrical connector 30 using the chip capacitor 1 of the present invention. The electrical connector 30 has an insulative housing 32, a board 34 attached to the rear portion thereof, a metal ground plate 36, and terminals 38, 40 held by the housing 32 and the board 34. The chip capacitor 1 is surface-mounted (SMT) on the substrate 34. In FIG. 2, the portion surrounded by the alternate long and short dash line is enlarged and shown in FIG.

In FIG. 3, one electrode 2 of the chip capacitor 1 is surface-mounted by a pin 44 sandwiched between signal conductors 42 of a substrate 34. The other electrode 4 is surface-mounted on the grounding conductor 46 with solder 44. The grounding conductor 46 is connected to the ground plate 36 by means such as soldering. When a high voltage temporarily flows to the terminal 38 in the state shown in FIG. 3, the high voltage current does not pass through the inside of the chip capacitor 1 but discharges between the edges 10 and 12 of the electrodes 2 and 4 and flows. Therefore, the inside of the chip capacitor 1 is not destroyed. The solder resists 6, 8 prevent the solder 44 from reaching the edges 10, 12 of the electrodes 2, 4 during soldering. Therefore, since the discharge gap a cannot be changed by the solder 44, a predetermined performance can be maintained.

FIG. 4 shows a chip capacitor 1 ′ according to another embodiment of the present invention. The chip capacitor 1'has a cylindrical shape with dimensions of about 1.3 x 2 mm. This chip capacitor 1'has electrodes 2 ', 4'and solder resists 6', 8'on electrodes 2 ', 4', similar to the rectangular chip capacitor 1. The electrodes 2 ', 4'are arranged at a predetermined interval to form a discharge gap a'. This cylindrical chip capacitor 1 ′ can be mounted on the surface and used in the same manner as the chip capacitor 1.

The capacitor with a discharge gap and the electric connector using the same according to the present invention have been described above with reference to the accompanying drawings showing a preferred embodiment. The feature of the present invention is to form a discharge gap on the surface of the chip capacitor. Therefore, it will be understood that the size and shape of the chip capacitor, the shape of the electrodes, and the distance of the gap a can be arbitrarily modified and changed as long as the above characteristics are utilized. In addition, a protrusion may be provided along the surface at the edge of the electrode so that discharge is generated at that portion.

[0013]

[Effect of device]

 As described above, the chip capacitor of the present invention has the following effects because the discharge gap having the predetermined gap is provided along the longitudinal direction of the outer surface thereof. That is, even if a high-voltage current flows, the discharge is performed in the discharge gap on the surface and the current passes therethrough, so that the inside of the capacitor is not destroyed and a long life can be maintained.

Further, the electric connector using the same can maintain the function as a connector for a long time without deteriorating the performance of the electronic device to which it is connected.

[Brief description of drawings]

FIG. 1 is a perspective view of a chip capacitor according to the present invention.

2 is a vertical sectional view of an electric connector using the chip capacitor of FIG.

3 is a partially enlarged cross-sectional view of a portion indicated by a chain line in FIG.

FIG. 4 is a perspective view showing a chip capacitor according to another embodiment of the present invention.

FIG. 5 is a partially enlarged cross-sectional view showing a conventional chip capacitor.

[Explanation of symbols]

 1,1 'Capacitor with discharge gap 2,2', 4,4 'Electrode 30 Electrical connector 38,40 Signal terminal 46 Ground conductor a, a' Discharge gap

Claims (2)

[Scope of utility model registration request] 1. A capacitor having a discharge gap, which has electrodes at both ends and has a substantially uniform cross section, and which has a discharge gap of a predetermined gap in the longitudinal direction of the outer surface of the capacitor. 2. An electrical connector having a signal terminal and a ground conductor, wherein a capacitor having a substantially uniform cross-section is connected between at least a part of the signal terminal and the ground conductor, and the length of the outer surface of the capacitor is long. An electrical connector characterized in that a discharge gap having a predetermined gap is formed in a direction.