JP2003051234A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance isolation characteristics, and reduce losses. SOLUTION: Respective fixed terminals 18a, 18b, 18c are supported by a side face of the base 4, composed of a dielectric body and having the inner space. Fixed contact points 19a, 19b, 19c are exposed into the inner space. The surface of the fixed terminals 18a, 18b, 18c is installed, so as to become in parallel with the bottom surface of the base 4. By arranging movable blocks 15a, 15b in the inner space, a signal wire is formed by the fixed terminals 18a, 18b, 18c and the movable contact pieces 16a, 16b. At at least either side of the upward or downward of the inner space corresponding to the signal wire, shielding parts 5, 6 to be grounded are installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay suitable for opening and closing high frequency signals.

[0002]

2. Description of the Related Art Conventionally, there is an electromagnetic relay having a microstrip line structure, which is suitable for opening and closing a high frequency signal.

For example, in Japanese Unexamined Patent Publication No. 6-12957, a ground portion is provided on the upper surface or the lower surface of a base, and a movable block disposed on the base drives a movable contact piece laterally to open / close a contact. However, there is disclosed an electromagnetic relay in which a high frequency signal is transmitted or cut off via a signal line composed of a fixed contact piece and a movable contact piece.

Generally, in such an electromagnetic relay that transmits or cuts off such a high-frequency signal, the entire case or the contact opening / closing portion is covered with a shield plate, and the shield plate is grounded to enhance the isolation characteristic. There is.

[0005]

However, in order to reduce the size of the electromagnetic relay, members such as a movable iron piece that is a driving portion and a movable contact piece that is a contact opening / closing portion are provided in a limited narrow internal space. Are crowded. Therefore,
It is impossible to dispose the shield plate over a wide range around the signal line by using the remaining small space, and there is a limit to increase the isolation.

On the other hand, if the shield plate can be arranged over a wide range around the signal line, there is a problem that the electromagnetic relay itself becomes large. Moreover, the signal line including the movable contact piece separates upward from the base, resulting in a large loss.

Therefore, an object of the present invention is to provide an electromagnetic relay which is small in size, has high isolation characteristics, and has little loss.

[0008]

As a means for solving the above problems, the present invention comprises a plurality of fixed terminals having fixed contacts and a movable contact piece having movable contacts that can be brought into contact with and separated from the fixed contacts. A movable block and an electromagnet block for driving the movable block, the electromagnetic block is excited or demagnetized to drive the movable block, and a high frequency signal is transmitted or interrupted by opening or closing a contact. In the relay, each fixed terminal is made of a dielectric material and is supported by a side surface of a base having an internal space, and fixed contacts of the fixed terminal are exposed to the internal space,
Further, while the fixed terminal is provided so that the surface thereof is parallel to the bottom surface of the base, the movable block is arranged in the internal space to form a signal line with the fixed terminal and the movable contact piece. The shield part to be grounded is provided on at least one side above or below the internal space corresponding to.

As a means for solving the above-mentioned problems, the present invention provides an electromagnetic relay in which a high-frequency signal is transmitted or cut off by opening / closing a contact opening / closing portion formed in the middle of the signal line. Is formed of a dielectric material and is supported by opposing side surfaces of a base having an internal space, whereby the contact opening / closing portion is located in the internal space of the base, and at least one of an upper surface portion and a lower surface portion forming the internal space. On one side, a shield part to be grounded is provided.

With these structures, a microstrip line structure can be obtained by the shield part and the signal line, and the contact opening / closing part is located in the internal space, and an air layer is interposed around the contact opening / closing part to improve isolation. It becomes possible.

In this case, when mounted on a printed circuit board and the contact opening / closing section is positioned parallel to the printed circuit board, the signal line can be positioned parallel to the vicinity of the printed circuit board, thus minimizing loss. It is preferable in that it can be suppressed.

It is preferable to cover the internal space of the base by arranging the shield portions on the upper and lower surfaces of the base and the four side surface portions, because it is possible to further improve the isolation and suppress the loss. .

When the shield portions are respectively arranged on the upper and lower surfaces of the base and are electrically connected to each other, the shield effect is exerted over almost the entire area of the signal line, and higher isolation can be obtained. It is preferable in terms.

The signal line is vertically movable by a fixed terminal, which is supported on opposite side surfaces of the base and has a fixed contact at a free end thereof, and a guide portion formed on an inner surface of the base which forms an internal space. The movable block may be composed of a support portion supported by the movable contact piece and a movable block that extends from the support portion and has movable contact pieces having movable contacts that can be brought into contact with and separated from the fixed contact at both ends.

The guide portion is preferable in that the supporting state can be stabilized by supporting the supporting portion of the movable block in a vertically movable manner by partial contact.

When an urging means for urging the movable contact piece to maintain the contact in the open state or the closed state is provided on the upper surface portion or the lower surface portion of the base, the operation state of the movable contact piece is stabilized. It is preferable in that it can

It is preferable that the shield portion is formed with a protrusion that abuts on the movable contact piece in an open state and maintains a constant distance between contacts.

It is preferable that a concave portion is formed in the shield portion to maintain a constant distance from the signal line and a constant characteristic impedance.

The lower surface of the base is composed of a shield portion,
You may form a protrusion part in this shield part.

The lower surface of the base is composed of a shield part,
A standoff may be formed in the shield part to form a gap between the lower surface of the base and the upper surface of the printed circuit board when the shield part is in contact with the upper surface of the printed circuit board.

Of the inner surface forming the internal space of the base, at least a portion where the shield portion is not provided,
Forming a shield surface to be grounded is preferable in that a structure having further excellent high frequency characteristics can be obtained.

A shield portion is provided on the lower surface of the base,
It is preferable to make the characteristic impedance constant by bending a signal terminal that is derived from the base and connected to the signal line so as to maintain a predetermined dimension with respect to the shield portion.

If shield terminals connected to the shield portion provided on the lower surface of the base are arranged on both sides of the signal terminal which is led out from the base and is connected to the signal line, isolation is also enhanced in the signal terminal. It is preferable because it can be obtained.

[0024]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an electromagnetic relay according to this embodiment. The electromagnetic relay is generally composed of a base block 1, an electromagnet block 2, and a case 3.

The base block 1 comprises a base 4, an upper shield plate 5 and a lower shield plate 6.

As shown in FIG. 3, the base 4 is made of a dielectric material such as a synthetic resin material having a substantially rectangular shape. Base 4
The guide wall 8 having the locking projections 7 at the central portions on both sides of the upper surface of the
Are formed respectively. On the upper surface of the base 4, the first side wall portion 9 and the second side wall portion 10 are provided on both sides of the guide wall 8.
However, the 3rd side wall part 11 is formed in each both ends. First side wall portion 9, second side wall portion 10 and third side wall portion 11
A fitting concave portion 4a is formed between the above and the concave portion 11a, and a concave portion 11a is formed above the third side wall portion 11. Also, the base 4
A plurality of escape grooves 12 are formed on the side surface of the. A rectangular opening 13 is formed in the center of the base 4, and guide groove portions 14 are formed in two opposing portions on both inner surfaces of the opening 13. The guide groove portion 14 has a hemispherical projection 14a formed on the opposite surface thereof, and is provided with movable blocks 15a, 15
Each b is vertically guided. The movable blocks 15a and 15b are such that the central portions of the movable contact pieces 16a and 16b made of a conductive plate material are held by a support portion 17 made of a synthetic resin material, respectively. Although the projection 14a of the guide groove portion 14 has a hemispherical shape, it may have another shape such as a ridge. It can also be formed on the side of the holding portion 17, and the point is that it is possible to stabilize the support state of the movable blocks 15a and 15b by the guide groove portion 14. In addition, the fixed terminals 1 are provided at both ends and the center of the base 4.
8a, 18b and 18c are integrated respectively. Fixed contact portions 19a of the fixed terminals 18a, 18b, 18c,
19b and 19c are exposed at both ends and the center of the opening 13, respectively. Then, the movable contact piece 16
a and 16b both ends (moving contact part) and fixed contact part 19
A contact opening / closing section is formed by a, 19b, and 19c. In addition, the terminal portions 20a, 20b, 20c are bent in a stepwise manner so as to maintain a constant space between the lower shield plate 6 and the upper shield plate 5, which will be described later, from the lower surface to both ends and sides. Will be extended to A recess 21 is formed on the bottom surface of the base 4. Slits 21 a are formed at a plurality of locations on the edge of the recess 21.

As shown in FIG. 4, the lower shield plate 6 is made of a rectangular plate-shaped conductive material, and two recesses along the longitudinal direction are formed with standoffs 22 projecting downward. . The standoff 22 forms a gap between the printed circuit board and the base 4 when mounted on the printed circuit board, and prevents flux from entering during soldering. However, the recessed portions are fixed terminals 18a, 18b, 1
8C and the movable contact pieces 16a and 16b are formed so as to have a constant distance, it is possible to exert the function of increasing the characteristic impedance. The lower shield plate 6 constitutes the lower surface of the base 4, and the return spring 2 is provided at the center of the upper surface.
3 is provided. Both ends of the return spring 23 are pressed against the bottom surfaces of the supporting portions 17 of the movable blocks 15a and 15b to urge the movable contact pieces 16a and 16b toward the upper shield plate 5. Standing walls 24 are formed at a plurality of positions on the edge of the lower shield plate 6, and the slits 21 of the base 4 are formed.
It is located at a and enhances the lateral insulation with respect to the internal space of the base 4. A locking piece 25, which is inserted into the slit 21a of the base 4 and then bent in a substantially right angle direction and locked by the upper shield plate 5, projects from the upper edge of the standing wall 24.

As shown in FIG. 2, the upper shield plate 5 is made of a rectangular plate-shaped conductive material, and rectangular insertion holes 26 are formed at two positions in the longitudinal direction.
5 is vertically movable. By pushing both sides of each insertion hole 26 downward, the ground contact 2
7a and 27b (see FIG. 12) are formed respectively. Each movable block 1 is connected to the ground contacts 27a and 27b.
Both ends (movable contact portions) of the movable contact piece 16 of No. 5 alternately come into contact with and separate from each other, and maintain a constant distance (distance between contacts) from the fixed contact portions 19a, 19b, 19c. In addition, a plurality of ground terminal portions 2 are provided downward from the edge portion of the upper shield plate 5.
8 are extended respectively. Each ground terminal portion 28 is
The relief grooves 12 are formed on the side surfaces of the base 4, respectively.

The electromagnet block 2 has a structure in which an iron core 30 and a permanent magnet 31 are arranged on a spool 29 and a coil 32 is wound.

As shown in FIG. 5, the spool 29 is provided with relief portions 33 which are vertically communicated with each other at both ends. On the inner surface of the escape portion 33, a heat staking portion 34 used for fixing the iron core 30 described later is formed. Escape section 33
Are communicated with each other by the accommodation groove portion 35 formed on the upper surface. An accommodation hole 36 in which the permanent magnet 31 is disposed is formed in the center of the accommodation groove 35. As shown in FIG. 5B, substantially triangular fulcrum portions 37 are provided on both sides of the lower edge of the accommodation hole 36, and a holding portion 39 is provided on the side thereof via a groove 38. Has been done. Further, the outer surfaces of both side walls of the housing groove 35 are inclined, and the coil winding portions 40 are respectively formed by cutting out two facing portions. On one side edge of the spool 29, terminal holes 41 vertically penetrating are formed at a plurality of positions, and coil terminals 42 are formed.
(See FIG. 6A) are press-fitted. Further, at the bottom corners of the spool 29, the fitting recesses 4 of the base 4 are provided.
Fitting protrusions 29a that fit into a are respectively formed.

As shown in FIG. 6 (a), the iron core 30 is formed by bending both ends of a magnetic plate material in a stepwise manner, and the lower surfaces of both ends are suction surfaces 43 exposed downward at the escape portions 33 of the spool 29. Make up.

The permanent magnet 31 has a substantially rectangular parallelepiped shape, and the spool 29 is arranged so that different polarities are located above and below, respectively.
It is disposed in the accommodation hole 36 of.

A movable iron piece 44 made of a magnetic plate is arranged below the electromagnet block 2. As shown in FIG. 7, inclined surfaces are formed at both ends of the upper surface of the movable iron piece 44, and are configured to come into surface contact when sucked by the suction surface 43 of the iron core 30. A pressing spring 45 is attached to the center of the lower surface of the movable iron piece 44 by welding, caulking or the like. The pressing spring 45 includes a positioning portion 46 extending from both sides of the movable iron piece 44, and a pressing portion 47 that is orthogonal to the positioning portion 46 and is inclined and projected downward. A locking recess 46a is formed in the positioning portion 46. The locking recess 46 a is locked by the locking projection 7 formed on the base 4 and positions the movable iron piece 44. The pressing portion 47 presses the support portion 17 of the movable block 15 downward.

As shown in FIG. 1, the case 3 has a substantially box-like shape that opens downward and has a gas vent 4 at the corner of the upper surface.
8 is formed.

Next, a method of manufacturing the electromagnetic relay will be described. This electromagnetic relay is generally formed by forming a base block 1 and an electromagnet block 2, respectively, assembling the electromagnet block 2 to the base block 1, and covering the case 3.

In forming the base block 1, first, a lead frame (not shown) is punched out to fix the fixed terminals 18a, 1a.
8b and 18c are formed and conveyed into the mold to complete the base 4 by insert molding. FIG. 8 shows the fixed terminal 18
An example of arrangement of a, 18b, and 18c is shown. Here, of the six terminal portions t, which terminal portion t is fixed terminal 18
There is shown an example in which three types of arrangements can be selected depending on whether a, 18b, or 18c is selected. That is, the terminal portion t not used as the fixed terminal 18 is a, b or c.
Fixed contact part 1 by cutting at any position
It is separated from 9a, 19b and 19c, and after insert molding, it is removed from the base 4. However, the fixed contact portion 19a,
The number of each terminal portion t extending from 19b and 19c is not limited to two and may be three or more, and the number of fixed contact portions may be four or more. Subsequently, the return spring 23 is attached to the central portion of the upper surface of the lower shield plate 6, and the lower shield plate 6 is arranged on the lower surface of the base 4 and the movable block 15 is arranged on the guide groove portion 14, as shown in FIG. At this time, the fixed terminal portions 20a, 20b, 20c are bent downward to maintain the positional relationship with the lower shield plate 5 substantially constant. Then, as shown in FIG. 10, the upper shield plate 5 is disposed on the upper surface of the base 4. At this time, the outer edge portion of the upper shield plate 5 and the standing wall 24 of the lower shield plate 6 come into contact with each other. Further, the ground terminal portion 28 of the upper shield plate 5 is located in the escape groove 12 of the base 4, and each fixed terminal 18
The terminals a, 18b, and 18c are located on both sides of the terminal portions 20a, 20b, and 20c, respectively. Furthermore, the movable block 15
The support portions 17 of a and 15b are moved upward by the urging force of the return spring 23 and are positioned in the insertion hole 26 of the upper shield plate 5. Then, by bending the locking piece 25 provided on the upright wall 24, the respective members are integrated, and the base block 1
(See FIG. 10) is completed.

The base block 1 thus completed
Then, the movable contact pieces 16a, 1 are attached to the fixed contact portions 19a, 19b, 19c of the fixed terminals 18a, 18b, 18c.
6b moves in parallel in the vertical direction. That is, the fixed terminal 18
The signal lines composed of a, 18b, 18c and the movable contact pieces 16a, 16b are the upper shield plate 5 and the lower shield plate 6.
Parallel to, forming a stripline.
Further, the ground terminal portion 28 of the upper shield plate 5 and the standing wall 24 of the lower shield plate 6 are located beside the signal line, and the periphery thereof is covered with the shield plates 5 and 6. Therefore, not only is it less susceptible to the influence of ambient noise, but also the isolation characteristic is enhanced and the loss is reduced.

In forming the electromagnet block 2, first, the iron core 30 is arranged in the accommodation groove 35 of the spool 29. Since both ends of the iron core 30 are bent stepwise and are positioned at the escape portion 33 of the spool 29, the suction surface 43
Is exposed on the lower surface side. Here, the heat crimping portion 34 is heated to be melted, and the iron core 30 is fixed to the spool 29. Further, the permanent magnet 31 is housed in the housing hole 36 from below, the coil terminal 42 is press-fitted into the terminal hole 41, and the coil 32 is wound around the coil winding portion 40. And the coil 32
Both ends of the coil are wound around the upper ends of the coil terminals 42, and are bent inward to complete the electromagnet block 2 (see FIG. 6B).

Further, in assembling the electromagnet block 2 to the base block 1, first, the movable iron piece 44 to which the pressing spring 45 is attached is arranged above the base block 1. The movable iron piece 44 is positioned by the positioning wall 46 of the pressing spring 45 being guided by the guide wall 8 of the base 4 and the locking projection 7 being locked in the locking recess 46a. Then, as shown in FIG. 11, the fitting projection 4a of the base 4 is fitted into the fitting recess 29a of the spool 29, and the fitting portion is heat-squeezed, welded, bonded, etc.
Attach the electromagnet block 2 to. At this time, the positioning portion 46 of the pressing spring 45 guided by the guide wall 8 is clamped by the pressing portion 39 of the spool 29. Further, the fulcrum portion 37 contacts the pressing spring 45, and the movable iron piece 44 is rotatably supported around the fulcrum portion 37. further,
A window 49 is formed by the notch between the first side wall 9 and the second side wall 10 of the base 4 and the side wall of the electromagnet block 2. At this time, by changing the bending angle or the like of the pressing spring 45 through the window 49 and adjusting the contact pressure,
Obtain the desired operating characteristics. In addition, the third side wall portion 1 of the base 4
The window portion 50 is formed by the concave portion 11a formed in 1 and the spool 29. Then, the operating state of the movable iron piece 44 can be confirmed through the window 50.

Case 3 is thus the base block 1
The electromagnet block 2 is assembled to the base 4 and fitted to the base 4 so as to cover the components. The fitting surface is sealed by applying an adhesive and curing it at a high temperature. afterwards,
The gas vent hole 48 is heat-sealed to make the inside airtight.

Next, the operation of the electromagnetic relay will be described.

The electromagnetic relay is used by mounting it on a printed circuit board (not shown). In this case, the terminal portions 18a, 18b, 18c and 28 projecting downward are bent substantially at right angles to form a staircase shape, and are connected to the conductive portion and the ground portion of the printed circuit board by soldering. Then, by changing the energizing direction to the coil 32, the first signal line composed of the fixed terminal 18a, the movable contact piece 16a and the fixed terminal 18b, the fixed terminal 18c, and the movable contact piece 16 are formed.
b and the second signal line composed of the fixed terminal 18b.

That is, when the coil 32 is energized to excite the electromagnet block 2, one end of the movable iron piece 44 is attracted to one attraction surface 43 of the iron core 30, as shown in FIG. Along with this, one end of the pressing spring 45 is
The one movable block 15a is pushed down against the biasing force of 3. As a result, the movable contact piece 16b is fixed to the fixed contact portion 19
By contacting b and 19c, the high frequency signal can be transmitted through the second signal line. Further, the other movable block 15a is moved upward by the urging force of the return spring 23, and the movable contact piece 16a comes into contact with the ground contact portion 27a of the upper shield plate 5. Therefore, the second signal line formed as described above is not adversely affected, and the distance between contacts is always kept constant. Further, in this state, since the magnetic circuit is closed by the permanent magnet 31, the movable iron piece 44, and the iron core 30,
Even when the power supply to the coil 32 is cut off, the movable iron piece 44 maintains the rotating state, and the movable contact piece 16b is fixed to the fixed terminals 18b, 1.
It is not separated from 8c.

On the other hand, when the direction of energization to the coil 32 is reversed, the polarities of the suction surfaces 43 of the iron core 30 are reversed,
The movable iron piece 44 rotates the fulcrum portion 37 (see FIG. 5B) in the counterclockwise direction from the state shown in FIG. As a result, the movable contact piece 16b moves upward in accordance with the urging force of the return spring 23, separates from the fixed contact portions 19b and 19c, and contacts the ground contact portion 27b of the upper shield plate 5. The movable contact piece 16a moves downward against the urging force of the return spring 23 due to an increase in the urging force from the pressing spring 45, contacts the fixed contact portions 19a and 19b, and a high-frequency signal on the first signal line. It enables the transmission of

The signal line switched in this manner is substantially parallel to the printed circuit board on which the electromagnetic relay is mounted, and is very close to the printed circuit board, and the upper and lower sides and the lateral sides are surrounded by the shield plate 5, It is surrounded by 6. Therefore, the isolation characteristic is very high and the loss is small. Therefore, the transmission of the high frequency signal is appropriately performed.

In the above-described embodiment, the slit 21a is formed in the base 4 and the standing wall 24 of the lower shield plate 6 is positioned in this slit 21a so that the side portions are also shielded. For example, a shield layer may be formed on the inner surface of the opening of the base 4 by plating or vapor deposition, and the shield layer may be grounded.

In the above embodiment, the terminal portions 18a,
Although 18b, 18c, and 28 were used after being bent in a stepwise manner, they can be used as they are as shown in FIG.

In the above embodiment, the return spring 23 is arranged in the center of the upper surface of the lower shield plate 6.
For example, the movable blocks 15a and 15b may be configured to be pressed downward by being arranged on the upper shield plate 5.

[0050]

As is apparent from the above description, according to the present invention, the signal line composed of the fixed terminal and the movable contact piece of the movable block is located in the internal space of the base, and is arranged above or below the signal line. Since the shield part that is grounded is provided, it is possible to improve the isolation characteristics and minimize the loss.

[Brief description of drawings]

1A is an upper perspective view of an electromagnetic relay according to the present embodiment, and FIG. 1B is a lower perspective view thereof.

FIG. 2 is an exploded perspective view of the electromagnetic relay shown in FIG.

3A is an upper perspective view of the base and the movable block in FIG. 2, and FIG. 3B is a lower perspective view thereof.

4A is an upper perspective view of the lower shield plate and the return spring of FIG. 2, and FIG. 4B is a lower perspective view thereof.

5 (a) is an upper perspective view of a spool constituting the electromagnet block of FIG. 2, and FIG. 5 (b) is a lower perspective view thereof.

6A is an exploded perspective view of the electromagnet block shown in FIG. 2, and FIG. 6B is a perspective view of the electromagnet block shown in FIG.

FIG. 7 is an exploded perspective view of the movable iron piece shown in FIG.

FIG. 8 is a perspective view showing an arrangement example of the fixed terminals shown in FIG.

9 (a) is an upper perspective view showing a state before the upper shield plate of the base block shown in FIG. 2 is assembled, and FIG.
Is a perspective view of the lower side thereof.

10A is an upper perspective view of the base block shown in FIG. 2, and FIG. 10B is a lower perspective view thereof.

11A is an upper perspective view showing a state where an electromagnet block is assembled to the base block shown in FIG. 2,
(B) is the lower side perspective view.

12 is a cross-sectional view of the electromagnetic relay shown in FIG.

13A is an upper perspective view of an electromagnetic relay according to another embodiment, and FIG. 13B is a lower perspective view thereof.

[Explanation of symbols]

1 ... Base block 2 ... Electromagnetic block 3 ... Case 4 ... Base 5 ... Upper shield plate 6 ... Lower shield plate 15a, 15b ... Movable block 16a, 16b ... Movable contact piece 18a, 18b, 18c ... Fixed terminal 19a, 19b, 19c ... Fixed contact portion 20a, 20b. 20c ... Terminal part 22 ... Standoff 24 ... Standing wall 27a, 27b ... Ground contact

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Atsushi Shishido             Shiokyo-ku, Kyoto-shi, Kyoto Prefecture             801 Kudo-cho Omron Co., Ltd.

Claims (15)

[Claims] 1. A movable block having a plurality of fixed terminals having fixed contacts, a movable contact piece having a movable contact that can be brought into contact with and separated from the fixed contacts, and an electromagnet block for driving the movable blocks. An electromagnetic relay in which an electromagnet block is excited or demagnetized to drive the movable block, and a contact is opened or closed to transmit or cut off a high-frequency signal, wherein each fixed terminal is made of a dielectric material and has an internal space. The movable block is supported by the side surface of the base, the fixed contact of the fixed terminal is exposed to the internal space, and the surface of the fixed terminal is parallel to the bottom surface of the base. A signal line is formed by the fixed terminal and the movable contact piece, and at least one of above and below the internal space corresponding to the signal line An electromagnetic relay characterized by having a shield part grounded on the side. 2. An electromagnetic relay in which a high-frequency signal is transmitted or blocked by opening / closing a contact opening / closing portion formed in the middle of a signal line, wherein the signal line is made of a dielectric material and is opposed to a base having an internal space. By supporting on the side surface, the contact opening / closing portion is located in the internal space of the base, and at least one of the upper surface portion and the lower surface portion forming the internal space,
An electromagnetic relay characterized by having a shield part that is grounded. 3. The electromagnetic relay according to claim 2, wherein the electromagnetic relay is mounted on a printed circuit board, and the contact opening / closing portion is positioned in parallel with the printed circuit board. 4. The electromagnetic relay according to claim 2, wherein the shield part covers the inner space of the base by arranging the shield part on the upper and lower surface parts and the four side surface parts of the base. 5. The electromagnetic relay according to claim 2, wherein the shield parts are respectively arranged on upper and lower surfaces of the base and are electrically connected to each other. 6. The signal line is vertically moved by a fixed terminal supported on opposite side surfaces of the base and having a fixed contact at a free end, and a guide portion formed on an inner surface forming an internal space of the base. 3. A movable block, which is composed of a support portion that is freely supported, and a movable contact piece that extends from the support portion and that has movable contacts that can contact and separate from the fixed contact at both ends. 1 to 5
Electromagnetic relay according to paragraph. 7. The electromagnetic relay according to claim 6, wherein the guide portion supports the support portion of the movable block so as to be vertically movable by partial contact. 8. An urging means for urging the movable contact piece to maintain the contact in an open state or a closed state is provided on an upper surface portion or a lower surface portion of the base. 7. The electromagnetic relay according to 7. 9. The shield according to claim 6, wherein the shield part is formed with a protrusion that abuts on the movable contact piece in an open state to keep a distance between the contacts constant. Electromagnetic relay. 10. The shield according to claim 1, wherein a concave portion is formed in the shield portion to keep a constant distance from the signal line and a constant characteristic impedance. Electromagnetic relay. 11. The lower surface of the base is constituted by a shield portion, and the shield portion is formed with a protrusion capable of contacting with or soldering to a ground pattern of the printed circuit board. The electromagnetic relay according to any one of 1. 12. A stand for forming a gap between the lower surface of the base and the upper surface of the printed board by abutting the upper surface of the printed circuit board on the lower surface section of the base by a shield section. The electromagnetic relay according to any one of claims 3 to 11, wherein the electromagnetic relay is turned off. 13. The grounded shield surface is formed on at least a portion where the shield portion is not provided, of the inner surface forming the internal space of the base. Electromagnetic relay according to paragraph. 14. A shield portion is provided on a lower surface of the base, and a signal terminal led out from the base and connected to the signal line is bent so as to maintain a predetermined dimension with respect to the shield portion, 14. The electromagnetic relay according to claim 3, wherein the characteristic impedance is constant. 15. A ground terminal connected to a shield portion provided on the lower surface of the base is arranged on both sides of a signal terminal which is led from the base and connected to the signal line. The electromagnetic relay according to any one of 3 to 14.