JPH0714489A - High frequency relay - Google Patents

Abstract

PURPOSE:To improve isolation characteristics. CONSTITUTION:The tip end section of a contact point spring 9 is branched, and each movable contact point 10 is fixedly attached to the faces faced to the printed board 20 of the branched sections. Each circuit pattern 20a and 20b which is brought in contact with/parted from the respective movable contact points 10, is formed in the printed substrates 20. Each aforesaid circuit pattern is formed into a so-called double-break structure, and less signals are made to jump in among the contact points, so that isolation characteristics are thereby improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency relay having a balanced armature structure.

[0002]

2. Description of the Related Art A conventional high-frequency relay having a balanced armature structure is shown in FIG. In this high frequency relay, a case 1 is composed of a body 1a and a box-shaped cover 1b that is attached to the body 1a and has a lower surface opened. Inside the body 1a, a coil (not shown) is wound around a central piece of an iron core 6 formed in a substantially U-shape to form a coil block 3, and the coil block 3 is formed in the opening of the iron core 6. Is placed sideways with the side facing. A permanent magnet 4 is arranged between both side pieces 6a of the iron core 6, and both ends of the permanent magnet 4 are opposed to the both side pieces 6a of the iron core 6, and an armature block 5 is swingably arranged on the permanent magnet 4. The armature block 5 has a contact spring 9 having movable contacts 10 fixed at both ends.
Are integrally formed with the armature 8. A hinge spring piece (9a, see FIG. 4) integrally protruding from the contact spring 9 from one side of the center of the armature block 5 to give a force to separate the armature block 5 from the iron core 6 when the coil is not energized. Is projected.

The permanent magnet 4 is in the shape of a rectangular parallelepiped, its opposite ends and the center are magnetized with different polarities, and the coil block 3
Is interposed between both side pieces 6a of the iron core 6 by adhesion or the like, and is integrally combined with the coil block 3. The armature block 5 includes an armature 8 made of a magnetic material and a contact spring 9 made of a conductive material.
And the movable contact 10 (see FIG. 6). This high frequency relay includes a contact terminal 13, a common terminal 14 and a coil terminal (not shown), and the fixed contact 11 is a contact terminal 1.
3, the hinge spring piece is connected to one end of the common terminal 14, and the coil is connected to the coil terminal. The terminals 13 to 15 are inserted into the body 1a, and the other end is hung downward from the body 1a to serve as terminal pins for mounting on the printed board.

The high-frequency relay excites both side pieces 6a of the iron core 6 as a magnetic pole portion to different poles in accordance with the direction of current flow to the coil, attracts one of both end portions of the armature 8, and at the other A magnetomotive force is generated to separate the armature 8 and the armature 8 is rotated around the fulcrum portion (see 17a in FIG. 4). Thus, once the armature 8 is adsorbed to the side piece 6a of the iron core 6, the rotating state of the armature 8 is maintained by the magnetomotive force of the permanent magnet 4 even if the energization of the coil is stopped. Then, when rotating the armature 8 in the opposite direction, the energization direction of the coil may be reversed. The movable contact 10 fixed to the contact spring 9 that integrally rotates according to the rotation of the armature 8 that is rotated in this manner selectively contacts the left and right fixed contacts 11,
The contacts are switched by opening and closing.

The above description has been made in the case where the high frequency relay is constructed as a bistable type. However, when energization of the coil is stopped by imbalance of the spring load characteristics of the contact spring 9, a predetermined value is given. Moving contact 10 and fixed contact 1
It may be configured as a monostable type in which the armature 8 is returned and rotated in a state of being in contact with 1. By the way, in this type of high-frequency relay, it is desired to minimize the distance between the printed circuit board and the fixed contact 11 to reduce the leakage of high-frequency signals. That is, the high frequency signal leaks from the portion between the printed circuit board of the contact terminal 13 and the fixed contact 11. In the case of the above high frequency relay, the body 1
The bottom surface of a is the mounting surface on the printed circuit board 20.

In the case of the above-mentioned high frequency relay, since the armature block 5 and the permanent magnet 4 are arranged side by side next to the coil block 3, the overall shape is thin and the distance between the printed circuit board and the fixed contact 11 is small. Is narrowing. However, it is difficult for the structure of the high-frequency relay to further reduce the distance between the printed circuit board 20 and the fixed contact 11 in order to reduce the leakage of high-frequency signals and further improve the high-frequency characteristics. That is, in the case of the high-frequency relay, since the movable contact 10 is fixed to the contact spring 9 integrated with the armature 8 and the armature block 5 is placed on the permanent magnet 4, the position of the movable contact 10 is fixed. It is difficult to further lower the value, and as a result, the position of the fixed contact 11 cannot be brought closer to the printed circuit board side.

Therefore, the one shown in FIG. 8 has been proposed. In this high-frequency relay, the body 1a of the case 1 is eliminated, the components inside the case 1 are housed upside down, and the fixed contacts 10 are provided on the printed circuit board 20 on which the high-frequency relay is mounted. In this case, the fixed contact 10
Is provided on the printed circuit board 20, so that high frequency characteristics are improved.

[0008]

By the way, the conventional high-frequency relay of this type has one movable contact 10 and one fixed contact 1.
It is a so-called 1-point breaking structure that switches contacts by opening and closing with 1, and because it is small, it is difficult to keep the distance between contacts, and high frequency characteristics, especially isolation characteristics due to signal jump between separated contacts. However, there is a problem that deterioration occurs.

The present invention has been made in view of the above points, and an object of the present invention is to provide a high frequency relay which can obtain good isolation characteristics.

[0010]

In order to achieve the above object, in the invention of claim 1, a coil is wound around a box-shaped case whose bottom surface is open and a central piece of a substantially U-shaped iron core in an insulated state. A coil block, which is formed by mounting the coil core in a case with the opening direction of the iron core facing sideways, a permanent magnet interposed between both sides of the iron core, and a contact spring that is integrally attached to the armature in an insulated state. And an armature block that is arranged below the permanent magnet so that both ends of the armature face both sides of the iron core so that they can swing, and a printed circuit board that is mounted so as to close the lower surface of the case. The movable contacts are fixed to the surfaces of the branch parts that branch toward the printed circuit board, and the circuit patterns are formed on the printed circuit board so that the movable contacts come into contact with and separate from the printed circuit board.

In order to reduce deterioration over time,
As described in claim 2, it is preferable to mold the outside of the case with a resin for sealing.

[0012]

According to the invention of claim 1, when constituted as described above, when one movable contact is separated from one circuit pattern as a fixed contact, the other movable contact is also separated from the other circuit pattern. It is a so-called two-point cut structure.
Therefore, it is possible to reduce the signal jump between the contacts and improve the isolation characteristics.

According to the second aspect of the present invention, the high frequency relay is sealed by molding the outside of the case with a sealing resin to reduce deterioration over time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. The high frequency relay of this embodiment is based on the conventional example of FIG. In other words, the body 1 of case 1
In addition, a is eliminated, and the respective components inside the case 1 are accommodated upside down. Since the basic configuration is the same as that described in FIG. 7, the same reference numerals are given to the same configurations, and the description of the overlapping configurations will be omitted.

In the armature block 5 of this embodiment, as shown in FIG. 3, a synthetic resin portion 17 is formed in the center of the armature 8 and a contact spring 9 is inserted into the synthetic resin portion 17 to be integrated. Is formed. From one end surface of the synthetic resin portion 17, a fulcrum portion 17a for supporting the armature block 5 with respect to the case 1 is provided so as to swing. This point is the same as before. However, in the case of this embodiment, the left and right contact springs 9 are separated, and the hinge spring piece 16 which is conventionally integrally formed with the contact spring 9 is also separated from each contact spring 9. That is, the contact springs 9 and the hinge spring pieces 16 are insulated by the synthetic resin portion 17. Each contact spring 9
Has a bifurcated tip, and the movable contact 10 is fixed to the tip of each branch piece.

In the case of this embodiment, as shown in FIG. 1, the circuit patterns 20a and 20b on the printed circuit board 20 are provided as a structure corresponding to the conventional fixed contact 10, contact terminal 13 and common terminal 14. Used. The circuit patterns 20a and 20b are formed so as to come into contact with and separate from the movable contact 10, respectively. According to this structure, with the movable contact 10 separated from the circuit pattern 20a serving as the fixed contact, the circuit pattern 2 on the common line side is formed.
The movable contact 10 also separates from 0b, forming a so-called two-point cut structure. Therefore, it is possible to obtain good isolation characteristics by ensuring the distance between the circuit patterns in contact with the movable contact so as to obtain good isolation characteristics.

By the way, as described above, in the conventional high frequency relay having the one-point cut structure described in FIG. 8, in order to further improve the high frequency characteristics, the fixed contact 10 itself is provided as shown in FIG. 4 or FIG. The circuit pattern 20a of the printed board 20 may also be used. By doing so, leakage of high frequency signals from the fixed contact 11 itself can be reduced,
Further, the high frequency characteristics are improved.

[0018]

As described above, according to the first aspect of the present invention, as described above, a box-shaped case having an open lower surface and an opening of the iron core formed by winding a coil in an insulated state around a central piece of the substantially U-shaped iron core. A coil block housed in a case with its direction facing sideways, a permanent magnet interposed between both side pieces of the iron core, and contact springs integrally attached to the armature in an insulated state Each of which is provided with a armature block that is swingably disposed below the permanent magnets so as to face both side pieces of the iron core, and a printed circuit board that is mounted so as to close the lower surface of the case. Then, the movable contacts are fixed to the surfaces of the respective branch portions facing the printed circuit board, and the circuit patterns are formed on the printed circuit board so that the movable contacts come into contact with and separate from the printed circuit board. One circuit pattern as When al separated, the other movable contact can also be a so-called double-break structure separable from the other circuit patterns, thus less a dive signals between the contacts, isolation characteristic is improved.

According to the second aspect of the present invention, by molding the outside of the case with a resin for sealing, the high frequency relay can be sealed and deterioration over time can be reduced.

[Brief description of drawings]

FIG. 1 is a bottom view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same mounted state on a printed circuit board.

FIG. 3 is a plan view of an armature block.

FIG. 4 is a bottom view of a high frequency relay with improved high frequency characteristics.

FIG. 5 is a cross-sectional view of the same mounted state on a printed circuit board.

FIG. 6 is a plan view of an armature block.

FIG. 7 is a cross-sectional view of a conventional printed circuit board mounted state.

FIG. 8 is a cross-sectional view in a state of being mounted on another conventional printed circuit board.

[Explanation of symbols]

 1 Case 3 Coil Block 4 Permanent Magnet 5 Armature Block 6 Iron Core 8 Armature 9 Contact Spring 10 Moving Contact 16 Hinge Spring Piece 20 Printed Circuit Board 20a, 20b Circuit Pattern

Claims (2)

[Claims] 1. A box-shaped case having an open lower surface, and a coil formed in an insulated state around a central piece of a substantially U-shaped iron core. The coil block, the permanent magnet interposed between the both side pieces of the iron core, and the contact spring are integrally attached to the armature in an insulated state, and both ends of the armature face the both side pieces of the iron core. An armature block movably arranged below the permanent magnet and a printed circuit board mounted so as to close the lower surface of the case are provided, and the tip ends of the contact springs are branched to face the printed circuit boards of the respective branched portions. A high-frequency relay characterized in that a movable contact is fixed to a surface of the printed circuit board, and a circuit pattern is formed on the printed circuit board so that the movable contacts come into contact with and separate from each other. 2. The high frequency relay according to claim 1, wherein the outside of the case is molded by using a sealing resin.