JPH0132276Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an electromagnetic relay that opens and closes high-frequency signals.

Generally, high-frequency relays that open and close high-frequency signals are required to have high isolation between a movable contact piece and a fixed terminal.

In order to satisfy these requirements, the case has conventionally been formed by hollowing out or die-casting a metal such as brass, and the contact circuit has been constructed within the case.

However, the conventional method has disadvantages such as high processing costs and material costs for processing the case, and is not suitable for mass production.

The purpose of this invention is to provide a high-frequency relay that has a case that is easy to process, can be manufactured at low cost, is suitable for mass production, and has excellent isolation characteristics, insulation properties, and sound deadening properties.

This invention will be described below with reference to an illustrated embodiment.

FIG. 1 is a plan view showing a high frequency electromagnetic relay, and FIG. 2 is a cross-sectional view taken along the line A--A in FIG.

The housing is composed of a box-shaped case 1 made of synthetic resin, and a cover 2 made of synthetic resin that is attached to the case 1 and covers an electromagnet, a contact circuit, and a shield housing, which will be described later. The above case 1 has three rod-shaped fixed terminals 3, 4, 5.
The contact parts 3a, 4a, 5a are inside the case 1,
Terminal portions 3b, 4b, and 5b are fixed so as to protrude outside the case 1.

The ground terminals 6 and 7 are formed by bending metal plates into a U-shape, and the bent portions 6a and 7a pass through holes 1b and 1c formed in the recess 1a of the case 1 to the outside of the case. protrudes to. These ground terminals 6, 7 and the fixed terminals 3, 4, 5 are arranged in a straight line in the longitudinal direction of the case, and the plate width of the ground terminals 6, 7 is made larger than the plate width of the fixed terminal. Good isolation characteristics between terminals.

As shown in FIG. 3, the shield case 8 is formed by bending a metal plate into a U-shape so as to be open at the top, and has a pair of opposing side walls 8a and 8b. It is fitted and fixed in the recess 1a of the case 1 so as to be in electrical contact with the fixed terminals 7 and while maintaining electrical insulation from the fixed terminals 3, 4, and 5. A contact circuit is located between the side walls 8a and 8b, and the side wall 8a is located between the electromagnet and the contact circuit.

The cards 9 and 10 are supported so as to be movable up and down in guide grooves 1d and 1e formed in the case 1, and movable contact pieces 11 and 12 are fixed approximately at the center of the cards 9 and 10, respectively. Both ends of the movable contact piece 11 are contactably opposed to the fixed terminals 3 and 4, and both ends of the movable contact piece 12 are contactably opposed to the fixed terminals 4 and 5.
1 and 12 and fixed terminals 3, 4, and 5 constitute a contact circuit.

Further, the contact portions 11 of the movable contact pieces 11 and 12
On the side walls 8a, 8b of the shield case 8 facing the a, 11a, 12a, 12a, four ground contact portions 8c, . has been done. The shield cover 13 is formed by bending a metal plate into a U-shape, and is combined with the shield case 8 so as to cover the three open sides of the shield case 8, and is formed on the side wall portion of the shield case 8. Attach the locking pieces 8d and 8d to the shield cover 1.
By being locked onto the upper surface of 3, the two are integrated to form a box-shaped shield housing that surrounds the contact circuit.

An electromagnet consisting of an iron core 14, a coil 15, a spool 16, a yoke 17, a movable iron piece 18, and a return spring 19 is fixed in the recess 1f of the case 1. The return spring 19 has its base sandwiched between the yoke 17 and the protruding portion 1g of the case 1, and the pressing piece 19a at the free end is brought into pressure contact with the movable iron piece 18 which is hingedly supported on the yoke 17. A restoring force is applied to 18. Both ends of the connecting plate 20 are fitted into the holes 9a and 10a of the cards 9 and 10, so that the cards 9 and 10 are interlocked. A hole 21a is formed in the center of the spring plate 21, and openings 21b are formed on both sides of the hole 21a. death,
It is held in the case 1 by pressing its both ends against the protrusions 1h, 1h on both sides of the case 1 so as to bend the entire body.

Next, the operation of the high frequency electromagnetic relay constructed as described above will be explained.

When the coil 15 is de-energized, the movable contact piece 18 is in the return position as shown in FIG.
is urged upward by the spring force of the spring plate 21 transmitted via the connecting plate 20. Therefore, both ends of the movable contact piece 11 are in contact with the ground contact portions 8c, 8c of the shield case 8, and the fixed terminals 3, 4 are in an open state. Further, the contact portions 12a, 12a of the movable contact piece 12 are in contact with the contact portions 4a, 5a of the fixed terminals 4, 5, and the fixed terminals 4, 5 are in a closed state.

When the coil 15 is energized in this state, the movable iron piece 18 rotates clockwise and presses the connecting plate 20 downward against the spring force of the spring plate 21. As the connecting plate 20 descends, the cards 9 and 10 also descend, and the contact portions 11a and 11a of the movable contact piece 11 are connected to the contact portions 3a and 4a of the fixed terminals 3 and 4, and the contact portions 12a and 12a of the movable contact piece 12 are connected to the contact portions 3a and 4a of the fixed terminals 3 and 4, respectively. 12a contacts the ground contact portions 8c, 8c of the shield case 8, respectively. Therefore, the fixed terminals 3 and 4 are closed,
The fixed terminals 4 and 5 are in an open state. Then, when the energization to the coil 15 is stopped, the movable iron piece 18
Due to the spring force of the return spring 19, the cards 9 and 10 are
The spring plates 21 return to their initial positions by the spring force of the spring plate 21.

With the above structure, the shield case 8 can be formed by simply punching out and bending a metal plate, and the shield housing can be constructed by simply combining this with the shield cover 13, making processing extremely easy. It is easy and the material cost is low. Further, by fitting the shield case 8 into the recess 1a of the case 1, the shield case 8 can be easily positioned and fixed, which is convenient for automating assembly. Furthermore, since the contact circuit is surrounded by a box-shaped shield housing, it is possible to suppress high-frequency interference caused by the contact opening and closing from adversely affecting other equipment, and also to prevent the fixed terminals 3 and 4 or 4 and 5 from being in an open state. One day,
The movable contact piece 11 or 12 is a shield case 8
The high frequency signal is transmitted to the movable contact piece 11 or 12 because it contacts the ground contact part 8c of the
leaks through fixed terminals 3, 4 or 4, 5
High isolation can be achieved without the risk of the gap being closed.

In addition, since the shield housing 8 is not exposed on the surface of the relay and is housed within the case 1 and cover 2, when the relay is mounted on a board, insulation from other elements and equipment can be ensured, and Contact portions 11a, 11a, 1 of movable contact pieces 11, 12
The collision sound generated when 2a, 12a come into contact with the fixed terminals 3, 4, 5 or the ground contact portions 8c,...8c is caused by the collision between the shield housing, the case 1, and the cover 2.
Since it is sealed by the heavy structure and difficult to hear from the outside, it can be used as a noise-reducing relay.

As described above, according to this invention, the shield housing is composed of a shield case formed by bending a metal plate and a shield cover that closes the upper opening of the shield case, so it is extremely easy to process. Furthermore, since the shield case is fitted into the recess, the shield case can be easily positioned and fixed. In addition, since the contact circuit section is surrounded by a box-shaped shield housing, it is possible to suppress the occurrence of high-frequency interference when the contacts are opened and closed, and since the ground contact section is formed on the inner surface of the shield housing, leakage of high-frequency signals can be prevented. It has excellent isolation characteristics. Furthermore, since the shield housing is housed within the case and cover, a high-frequency relay with good insulation and sound deadening properties can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing an embodiment of this invention, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is an exploded perspective view showing the main parts of the embodiment. 1...Case, 1a, 1f...Recess, 2...Cover, 3, 4, 5...Fixed terminal, 6, 7...Earth terminal, 8...Shield case, 8c...Earth contact portion, 9, 10... Card, 11, 12... Movable contact piece, 11a, 12a... Contact portion, 13...
shield cover.

Claims (1)

[Scope of utility model registration request] a case having a recess and formed so that the recess is divided into a first cavity and a second cavity by a protrusion provided on an inner wall surface of the recess; an electromagnet disposed in the first cavity; a contact circuit consisting of a movable contact piece disposed in the second space and a pair of fixed terminals that are opened and closed by the movable contact piece; a card that transmits the movement of the electromagnet to the movable contact piece; and the fixed terminal. A shield housing that surrounds the contact circuit while maintaining electrical insulation, a ground terminal that is electrically connected to the shield housing, and an insulating material that is adhered to the case and covers the electromagnet, contact circuit, and shield housing. The shield housing has a box-like structure including a shield case formed by bending a metal plate so that the upper part is open, and a shield cover that closes the upper opening of the shield case. The shield case is fixed in the second space, and a ground contact part is formed on the inner surface of the shield case, and the contact part of the movable contact piece that is in an open state with respect to the fixed terminal is connected to the ground contact part. A high frequency relay characterized in that a movable contact piece is grounded by being brought into contact with the above earth contact part.