Electromagnetic relay

Abstract

To facilitate adjustment of the assembly dimensions of an electromagnetic relay and prevent a reduction in high frequency characteristics.SOLUTION: An electromagnetic relay comprises a transmission line base, a movable contact piece, a coil block, a movable block, a stand, and a spacer. The transmission base includes a first transmission line and a second transmission line. The movable contact piece is arranged on the transmission line base. The movable contact piece is movable to a connection position and a cut-off position. The movable contact piece connects the first transmission line and the second transmission line to each other at the connection position. The movable contact piece cuts off the connection between the first transmission line and the second transmission line at the cut-off position. The coil block includes a coil. The movable block is operated by an electromagnetic force of the coil to move the movable contact piece between the connection position and the cut-off position. The stand is arranged above the transmission line base. The stand supports the coil block and the movable block. The spacer is arranged between the stand and the transmission line base.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to an electromagnetic relay, and more particularly to an electromagnetic relay for switching high frequency signals. [Background technology]

[0002] Electromagnetic relays are used to switch high-frequency signals. For example, the electromagnetic relay disclosed in Patent Document 1 includes a movable contact piece, a fixed terminal, a movable block, and an electromagnet block. The electromagnet block includes a coil and generates an electromagnetic force that operates the movable block. The movable block presses the movable contact piece to bring the movable contact piece into contact with the fixed terminal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-51234 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the electromagnetic relay described above, the contact stability of the movable contact is affected by assembly dimensions such as the distance between the movable contact and the fixed terminal, or the distance between the movable block and the movable contact. However, the dimensional tolerances of these components vary. Therefore, in order to adjust the assembly dimensions to the target dimensions, bending may be performed on the movable contact or the fixed terminal after assembling the components.

[0005] However, in an electromagnetic relay for switching a high-frequency signal, the movable contact is part of the transmission line of the high-frequency signal. Therefore, when the movable contact is bent, high-frequency characteristics such as insertion loss and return loss deteriorate. The object of the present invention is to facilitate adjustment of the assembly dimensions of the electromagnetic relay and to suppress deterioration of the high-frequency characteristics. [Means for solving the problem]

[0006] An electromagnetic relay according to one aspect of the present invention includes a transmission line base, a movable contact piece, a coil block, a movable block, a stand, and a spacer. The transmission line base includes a first transmission line and a second transmission line. The movable contact piece is disposed on the transmission line base. The movable contact piece is movable between a connection position and a disconnection position. In the connection position, the movable contact piece connects the first transmission line and the second transmission line. In the disconnection position, the movable contact piece disconnects the first transmission line and the second transmission line. The coil block includes a coil. The movable block is actuated by electromagnetic force of the coil to move the movable contact piece between the connection position and the disconnection position. The stand is disposed above the transmission line base. The stand supports the coil block and the movable block. The spacer is disposed between the stand and the transmission line base.

[0007] In the electromagnetic relay according to this aspect, a spacer is disposed between the stand and the transmission line base. Therefore, the distance between the stand and the transmission line base can be adjusted by adjusting the thickness of the spacer. The stand supports the coil block and the movable block. Therefore, the distance between the coil block and the transmission line base, or the distance between the movable block and the transmission line base, can be adjusted by adjusting the thickness of the spacer. Therefore, the assembly dimensions of the electromagnetic relay can be adjusted without bending the movable contact piece. This makes it easy to adjust the assembly dimensions of the electromagnetic relay and suppresses degradation of high-frequency characteristics.

[0008] The spacer may include a layer of solidified adhesive, in which case the spacer is easily formed by pouring the adhesive between the stand and the transmission line base and allowing it to solidify.

[0009] The spacer may include a thin plate, in which case the spacer is easily formed by disposing the thin plate between the stand and the transmission line base.

[0010] The coil block may include an iron core. The iron core may be disposed within the coil. The movable block may include an iron piece that is attracted to the iron core by the electromagnetic force of the coil. A spacer may be disposed between the stand and the transmission line base to adjust the distance between the iron core and the transmission line base. In this case, the distance between the iron core and the transmission line base is adjusted by the spacer. This makes it easy to adjust the assembly dimensions between the iron core and the transmission line base.

[0011] The electromagnetic relay may further include a coil base that supports the coil block. The coil base may include an opening facing the iron core. In this case, the position of the iron core can be visually confirmed through the opening. This makes it easy to adjust the assembly dimensions between the iron core and the transmission line base.

[0012] The movable block may include a card placed above the movable contact piece. The card may press the movable contact piece to move it to the contact position. The stand may include an opening facing the card. In this case, the position of the card can be visually confirmed through the opening. This makes it easy to adjust the assembly dimensions between the card and the transmission line base.

[0013] The electromagnetic relay may further include a case. The case may be attached to the transmission line base. The case may cover the first transmission line, the second transmission line, the movable contact piece, and the stand. The stand and the coil block may be disposed within the case so as not to come into contact with the case. In this case, since the stand and the coil block are not in contact with the case, misalignment of the stand and the coil block with respect to the transmission line base is suppressed. This improves the accuracy of the assembly dimensions between the transmission line base and the coil block or the movable block. [Effects of the Invention]

[0014] According to the present invention, the assembly dimensions of the electromagnetic relay can be easily adjusted and degradation of high frequency characteristics can be suppressed. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is a perspective view of a transmission line base. [Figure 5] FIG. 1 is a top view of a transmission line base. [Figure 6] FIG. 2 is a perspective view of the base assembly and the stand as seen from below. [Figure 7] FIG. 2 is a perspective view of the base assembly as seen from below. [Figure 8] FIG. [Figure 9] FIG. 2 is a cross-sectional view of an electromagnetic relay in an open state. [Figure 10] FIG. [Figure 11] 1 is a cross-sectional view of an electromagnetic relay passing through a first leg and a second leg. [Figure 12] FIG. 10 is a cross-sectional view of the electromagnetic relay passing through the third leg and the fourth leg. [Figure 13] FIG. 2 is a side view of the electromagnetic relay in a closed state. [Figure 14] FIG. 2 is a cross-sectional view of an electromagnetic relay in a closed state. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electromagnetic relay according to an embodiment will now be described with reference to the drawings. The electromagnetic relay according to the present embodiment is used to switch between a high frequency RF signal and a low frequency DC signal.

[0017] 1 and 2 are perspective views of an electromagnetic relay 1 according to an embodiment. As shown in Fig. 1 and 2, the electromagnetic relay 1 includes a case 2, a transmission line base 3, a base assembly 4, and a stand 5. Note that the case 2 is omitted in Fig. 2. In the following description, the direction in which the base assembly 4 and the stand 5 are arranged relative to the transmission line base 3 is defined as the upper side, and the opposite direction is defined as the lower side.

[0018] As shown in FIG. 1, the case 2 is attached to the transmission line base 3. The case 2 covers the upper surface of the transmission line base 3, the base assembly 4, and the stand 5. FIG. 3 is an exploded perspective view of the electromagnetic relay 1. As shown in FIG. 3, the electromagnetic relay 1 includes a first movable contact piece 6A, a second movable contact piece 6B, and a shield plate 7. The first movable contact piece 6A, the second movable contact piece 6B, and the shield plate 7 are arranged on the transmission line base 3.

[0019] FIG. 4 is a perspective view of the transmission line base 3. Note that the shield plate 7 is omitted in FIG. 4. The transmission line base 3 is a printed circuit board. However, the transmission line base 3 may be a ceramic substrate, a resin molded product, a metal molded product, an FPC (flexible printed circuit board), or an MID (molded circuit component). As shown in FIG. 4, the transmission line base 3 includes first to fourth conductor layers 11-14 and first to third dielectric layers 15-17. The first to fourth conductor layers 11-14 are made of an electrically conductive material such as copper. The first to third dielectric layers 15-17 are made of a dielectric. The first to fourth conductor layers 11-14 and the first to third dielectric layers 15-17 are alternately stacked.

[0020] The first conductor layer 11 is provided on the upper surface of the transmission line base 3. Fig. 5 is a top view of the transmission line base 3. Note that the shield plate 7 and the movable contact pieces 6A and 6B are omitted in Fig. 5. As shown in Figs. 4 and 5, the first conductor layer 11 is provided with a first RF line 21A, a second RF line 21B, a first DC line 22A, a second DC line 22B, and a ground line 23.

[0021] The first RF line 21A and the second RF line 21B are transmission lines for transmitting RF signals. The first RF line 21A includes a first transmission line 24A and a second transmission line 25A. The first transmission line 24A and the second transmission line 25A are arranged apart from each other. The first transmission line 24A and the second transmission line 25A are electrically isolated from each other. The first transmission line 24A is connected to a first input terminal 26A. The second transmission line 25A is connected to a first RF terminal 27A. The first input terminal 26A and the first RF terminal 27A are each a through-hole terminal provided on an end surface of the transmission line base 3.

[0022] The second RF line 21B includes a third transmission line 24B and a fourth transmission line 25B. The third transmission line 24B and the fourth transmission line 25B are arranged apart from each other. The third transmission line 24B and the fourth transmission line 25B are electrically isolated from each other. The third transmission line 24B is connected to a second input terminal 26B. The fourth transmission line 25B is connected to a second RF terminal 27B. The second input terminal 26B and the second RF terminal 27B are each a through-hole terminal provided on an end surface of the transmission line base 3.

[0023] The first DC line 22A and the second DC line 22B are transmission lines for transmitting DC signals. The first DC line 22A is connected to the first transmission line 24A and the ground line 23. A first inductor 28A and a first capacitor 29A are arranged on the first DC line 22A. Note that in the drawing, only a portion of the first inductor 28A is denoted by the reference numeral 28A, and the reference numerals for the other first inductors 28A are omitted.

[0024] The first DC line 22A is connected to a first DC terminal 30A between the first inductor 28A and the first capacitor 29A. The first DC terminal 30A is a through-hole terminal provided on an end surface of the transmission line base 3. The first DC line 22A, the first inductor 28A, and the first capacitor 29A function as a low-pass filter that passes DC signals but blocks RF signals. The first inductor 28A and the first capacitor 29A are set to block high-frequency signals of, for example, 1 kHz or higher.

[0025] The second DC line 22B is connected to the third transmission line 24B and the ground line 23. A second inductor 28B and a second capacitor 29B are arranged on the second DC line 22B. Note that in the drawing, only a portion of the second inductor 28B is denoted by the reference numeral 28B, and the reference numerals for the remaining second inductors 28B are omitted.

[0026] The second DC line 22B is connected to a second DC terminal 30B between the second inductor 28B and the second capacitor 29B. The second DC terminal 30B is a through-hole terminal provided on an end surface of the transmission line base 3. The second DC line 22B, the second inductor 28B, and the second capacitor 29B function as a low-pass filter that passes DC signals but cuts RF signals. The second inductor 28B and the second capacitor 29B are set to cut high-frequency signals of, for example, 1 kHz or higher.

[0027] The second to fourth conductor layers 12-14 are ground layers. A plurality of through-hole terminals 31 are provided on an end face of the transmission line base 3. In the drawings, only some of the through-hole terminals 31 are labeled with the reference numeral 31, and the reference numerals of the other through-hole terminals 31 are omitted. The through-hole terminals 31 connect the above-mentioned ground line 23 to the second to fourth conductor layers 12-14.

[0028] As shown in FIG. 4, the first movable contact piece 6A and the second movable contact piece 6B are arranged on the transmission line base 3. The first movable contact piece 6A is arranged above the first RF line 21A. The first movable contact piece 6A includes a first connecting portion 32A, a first contact portion 33A, and a first intermediate portion 34A. The first connecting portion 32A is connected to the first transmission line 24A. The first contact portion 33A is arranged above the second transmission line 25A. The first intermediate portion 34A is located between the first connecting portion 32A and the first contact portion 33A.

[0029] As will be described later, the first movable contact piece 6A is movable between a connection position and a disconnection position. When the first movable contact piece 6A is in the connection position, the first contact portion 33A contacts the second transmission line 25A. This causes the first movable contact piece 6A to connect the first transmission line 24A and the second transmission line 25A. When the first movable contact piece 6A is in the disconnection position, the first contact portion 33A separates from the second transmission line 25A. This causes the first movable contact piece 6A to disconnect the first transmission line 24A and the second transmission line 25A.

[0030] The second movable contact piece 6B is disposed above the second RF line 21B. The second movable contact piece 6B includes a second connection portion 32B, a second contact portion 33B, and a second intermediate portion 34B. The second connection portion 32B is connected to the third transmission line 24B. The second contact portion 33B is disposed above the fourth transmission line 25B. The second intermediate portion 34B is located between the second connection portion 32B and the second contact portion 33B.

[0031] Like the first movable contact piece 6A, the second movable contact piece 6B is movable between a connecting position and a disconnecting position. When the second movable contact piece 6B is in the connecting position, the second contact portion 33B comes into contact with the fourth transmission line 25B. This causes the second movable contact piece 6B to connect the third transmission line 24B and the fourth transmission line 25B. When the second movable contact piece 6B is in the disconnecting position, the second contact portion 33B moves away from the fourth transmission line 25B. This causes the second movable contact piece 6B to disconnect the third transmission line 24B and the fourth transmission line 25B.

[0032] The shield plate 7 is disposed on the transmission line base 3. The shield plate 7 is made of a conductive material. The shield plate 7 is disposed above the first contact portion 33A and the second contact portion 33B. The shield plate 7 is connected to the ground line 23. The shield plate 7 improves the isolation characteristics between the first RF line 21A and the second RF line 21B.

[0033] Fig. 6 is a perspective view of the base assembly 4 and the stand 5 as viewed from below. Fig. 7 is a perspective view of the base assembly 4 as viewed from below. Fig. 8 is an exploded perspective view of the base assembly 4. Fig. 9 is a cross-sectional view of the electromagnetic relay 1. As shown in Figs. 6 to 9, the base assembly 4 includes a coil base 40, a coil block 41, and a movable block 42.

[0034] The coil block 41 includes a coil 43, a spool 44, and an iron core 45. The coil 43 is wound around the spool 44. The iron core 45 is disposed within the coil 43. The iron core 45 includes an intermediate portion 46, a first attraction portion 47, and a second attraction portion 48. The intermediate portion 46 is disposed within the coil 43 and extends in the axial direction of the coil 43. The first attraction portion 47 protrudes from the coil 43 in the axial direction of the coil 43. The first attraction portion 47 is disposed facing downward. The second attraction portion 48 protrudes from the coil 43 in the opposite direction to the first attraction portion 47 in the axial direction of the coil 43. The second attraction portion 48 is disposed facing downward.

[0035] The movable block 42 is operated by the electromagnetic force of the coil 43 to move the first movable contact piece 6A and the second movable contact piece 6B between the connection position and the disconnection position. Fig. 10 is a perspective view of the movable block 42. As shown in Fig. 10, the movable block 42 includes an iron piece 50, a first hinge spring 51, a second hinge spring 52, a permanent magnet 53, a card 54, and a movable insulating base 55.

[0036] The iron piece 50 is supported by a movable insulating base 55. The iron piece 50 includes a first end 56 and a second end 57. The first end 56 protrudes from the movable insulating base 55 in the axial direction of the coil 43. The first end 56 is disposed below the first attraction portion 47 of the iron core 45 and faces the first attraction portion 47. The second end 57 protrudes from the movable insulating base 55 in the opposite direction to the first end 56 in the axial direction of the coil 43. The second end 57 is disposed below the second attraction portion 48 of the iron core 45 and faces the second attraction portion 48.

[0037] The first hinge spring 51 is supported by the movable insulating base 55. The first hinge spring 51 protrudes from the movable insulating base 55 toward one side of the movable insulating base 55. The second hinge spring 52 is supported by the movable insulating base 55. The second hinge spring 52 protrudes from the movable insulating base 55 toward the other side of the movable insulating base 55. The permanent magnet 53 is attached to the upper surface of the movable insulating base 55.

[0038] The card 54 is supported by a movable insulating base 55. The card 54 protrudes downward from the movable insulating base 55. The card 54 is disposed above the first movable contact piece 6A and the second movable contact piece 6B. Specifically, the card 54 is disposed above the first intermediate portion 34A of the first movable contact piece 6A and the second intermediate portion 34B of the second movable contact piece 6B. The card 54 is connected to the underside of the first end portion 56 of the iron piece 50. The card 54 protrudes downward from the underside of the first end portion 56.

[0039] The movable insulating base 55 is supported so as to be able to swing relative to the coil base 40. As shown in FIG. 8, the coil base 40 includes support protrusions 58 and 59. As shown in FIG. 10, the movable insulating base 55 includes support holes 60 and 61. The support protrusions 58 and 59 are disposed in the support holes 60 and 61 and support the movable insulating base 55 so as to be able to swing. Also, as shown in FIG. 8, the coil base 40 includes a first support recess 62 and a second support recess 63. The first hinge spring 51 is disposed in the first support recess 62. The first hinge spring 51 is connected to the coil base 40 at the first support recess 62. The second hinge spring 52 is disposed in the second support recess 63. The second hinge spring 52 is connected to the coil base 40 at the second support recess 63. The movable insulating base 55 is supported by the coil base 40 so as to be swingable around the first hinge spring 51 and the second hinge spring 52 .

[0040] The stand 5 is disposed above the transmission line base 3 and supports the base assembly 4. More specifically, the stand 5 supports the coil base 40. The coil block 41 is supported by the stand 5 via the coil base 40. The movable block 42 is supported by the stand 5 via the coil base 40. The stand 5 includes a frame 70 and a plurality of legs 71-74. As shown in FIG. 6 , the frame 70 has an opening 75 in its center. The movable block 42 is disposed within the opening 75 of the frame 70. The card 54 extends downward through the opening 75.

[0041] The plurality of legs 71-74 protrude downward from the frame 70. The plurality of legs 71-74 each include a flat bottom surface 76-79. In detail, the plurality of legs 71-74 include a first leg 71, a second leg 72, a third leg 73, and a fourth leg 74. The first to fourth leg portions 74 are respectively arranged at the corners of the frame 70.

[0042] Fig. 11 is a cross-sectional view of the electromagnetic relay 1 taken through the first leg 71 and the second leg 72. Fig. 12 is a cross-sectional view of the electromagnetic relay 1 taken through the third leg 73 and the fourth leg 74. As shown in Figs. 11 and 12, the electromagnetic relay 1 includes spacers 81-84. The spacers 81-84 are disposed between the stand 5 and the transmission line base 3.

[0043] Specifically, the spacers 81-84 include a first spacer 81, a second spacer 82, a third spacer 83, and a fourth spacer 84. As shown in FIG. 11 , the first spacer 81 is disposed between the bottom surface 76 of the first leg 71 and the transmission line base 3. The second spacer 82 is disposed between the bottom surface 77 of the second leg 72 and the transmission line base 3. As shown in FIG. 12 , the third spacer 83 is disposed between the bottom surface 78 of the third leg 73 and the transmission line base 3. The fourth spacer 84 is disposed between the bottom surface 79 of the fourth leg 74 and the transmission line base 3.

[0044] FIG. 13 is a side view of the electromagnetic relay 1. Note that in FIG. 13, the case 2 is indicated by a two-dot chain line. As shown in FIG. 13, the spacers 81-84 are arranged to adjust the distance D1 between the first attraction portion 47 of the iron core 45 and the upper surface of the transmission line base 3. For example, the thickness of the spacers 81-84 is adjusted so that the distance D1 between the first attraction portion 47 of the iron core 45 and the upper surface of the transmission line base 3 becomes a predetermined target distance. Also, as shown in FIG. 9, the spacers 81-84 are arranged to adjust the distance D2 between the second attraction portion 48 of the iron core 45 and the upper surface of the transmission line base 3. For example, the thickness of the spacers 81-84 is adjusted so that the distance D2 between the second attraction portion 48 of the iron core 45 and the upper surface of the transmission line base 3 becomes a predetermined target distance.

[0045] The spacers 81-84 are formed by a layer of solidified adhesive. The spacers 81-84 have the role of adjusting the distances D1 and D2 between the iron core 45 and the upper surface of the transmission line base 3, as well as the role of fixing the stand 5 to the transmission line base 3.

[0046] 9 and 13, the coil base 40 includes a first base opening 85 and a second base opening 86. The first base opening 85 is open and faces the first attraction portion 47 of the iron core 45. In the electromagnetic relay 1, when the case 2 is removed, the first attraction portion 47 is visible through the first base opening 85. The second base opening 86 is open and faces the second attraction portion 48 of the iron core 45. In the electromagnetic relay 1, when the case 2 is removed, the second attraction portion 48 is visible through the second base opening 86.

[0047] The stand 5 also includes a stand opening 87. The stand opening 87 is provided between the first leg 71 and the third leg 73. The stand opening 87 is open and faces the card 54. When the case 2 of the electromagnetic relay 1 is removed, the tip of the card 54 is visible through the stand opening 87.

[0048] 11 to 13, the base assembly 4 is disposed away from the inner surface of the case 2. The base assembly 4 is disposed within the case 2 so as not to come into contact with the case 2. That is, the stand 5, the coil block 41, and the coil base 40 are disposed away from the inner surface of the case 2. The stand 5, the coil block 41, and the coil base 40 are disposed within the case 2 so as not to come into contact with the case 2.

[0049] Next, the operation of the electromagnetic relay 1 will be described. FIG. 9 shows the electromagnetic relay 1 in an open state. When no current flows through the coil 43, the coil 43 is not excited, and the iron piece 50 is not attracted to the iron core 45. Due to the magnetic force of the permanent magnet 53, the first end 56 of the iron piece 50 is attracted to the first attraction portion 47 of the iron core 45 and is in contact with the first attraction portion 47. Therefore, the card 54 is separated from the first movable contact piece 6A and the second movable contact piece 6B, and the first movable contact piece 6A and the second movable contact piece 6B are each in their disconnected positions. Therefore, in the first RF line 21A, the first transmission line 24A and the second transmission line 25A are disconnected from each other. In addition, in the second RF line 21B, the third transmission line 24B and the fourth transmission line 25B are disconnected from each other.

[0050] When current flows through the coil 43, the electromagnetic relay 1 is in the closed state shown in FIG. 14 . When the electromagnetic relay 1 is in the closed state, the second end 57 of the iron piece 50 is attracted to the second attraction portion 48 of the iron core 45 by the electromagnetic force of the coil 43 and rises. This causes the iron piece 50 to swing, and the first end 56 to descend. The card 54 descends together with the first end 56 and presses the first movable contact piece 6A and the second movable contact piece 6B, thereby moving the first movable contact piece 6A and the second movable contact piece 6B to their respective contact positions. This connects the first transmission line 24A and the second transmission line 25A to each other in the first RF line 21A. Furthermore, the third transmission line 24B and the fourth transmission line 25B to each other in the second RF line 21B.

[0051] When the current to the coil 43 is interrupted, the magnetic force of the permanent magnet 53 causes the iron piece 50 to rotate in the opposite direction, causing the second end 57 to descend and separate from the second attraction portion 48, while the first end 56 rises. The card 54 rises together with the first end 56 and separates from the first and second movable contact pieces 6A and 6B. As a result, the first and second movable contact pieces 6A and 6B return to their respective disconnected positions due to the elastic forces of the first and second movable contact pieces 6A and 6B. As a result, the first transmission line 24A and the second transmission line 25A are disconnected from each other in the first RF line 21A. Furthermore, the third transmission line 24B and the fourth transmission line 25B are disconnected from each other in the second RF line 21B.

[0052] For example, when an RF signal is input to the first input terminal 26A and the second input terminal 26B of the electromagnetic relay 1, the electromagnetic relay 1 is closed. In this case, the first transmission line 24A and the second transmission line 25A are connected to each other, and the third transmission line 24B and the fourth transmission line 25B are connected to each other. Therefore, the RF signal is output from the first input terminal 26A through the first RF line 21A to the first RF terminal 27A. The RF signal is also output from the second input terminal 26B through the second RF line 21B to the second RF terminal 27B. On the other hand, the RF signal is cut off at the first DC line 22A and the second DC line 22B, preventing the RF signal from being output from the first and second DC terminals 30B.

[0053] When a DC signal is input to the first input terminal 26A and the second input terminal 26B of the electromagnetic relay 1, the electromagnetic relay 1 is in an open state. In this state, the first transmission line 24A and the second transmission line 25A are disconnected from each other, and the third transmission line 24B and the fourth transmission line 25B are disconnected from each other. Therefore, the DC signal is output from the first input terminal 26A through the first DC line 22A without passing through the first RF line 21A and from the first DC terminal 30A. The DC signal is output from the second input terminal 26B through the second DC line 22B without passing through the second RF line 21B and from the second DC terminal 30B. This prevents the DC signal from flowing through the first movable contact 6A and the second movable contact 6B.

[0054] In the electromagnetic relay 1 according to the present embodiment described above, the spacers 81-84 are disposed between the stand 5 and the transmission line base 3. Therefore, the distance between the stand 5 and the transmission line base 3 can be adjusted by adjusting the thickness of the spacers 81-84. The stand 5 supports the coil block 41 and the movable block 42. Therefore, the distance between the coil block 41 and the transmission line base 3 or the distance between the movable block 42 and the transmission line base 3 can be adjusted by adjusting the thickness of the spacers 81-84. Therefore, the assembly dimensions of the electromagnetic relay 1 can be adjusted without bending the movable contact pieces 6A and 6B. This makes it easy to adjust the assembly dimensions of the electromagnetic relay 1 and suppresses degradation of high-frequency characteristics.

[0055] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

[0056] The configuration of the transmission line base 3 is not limited to that of the above embodiment and may be modified. The configuration of the transmission lines of the transmission line base 3 is not limited to that of the above embodiment and may be modified. For example, the second RF line 21B and the second DC line 22B may be omitted. The configuration of the terminals of the transmission line base 3 is not limited to that of the above embodiment and may be modified. For example, the second input terminal 26B, the second RF terminal 27B, and the second DC terminal 30B may be omitted. A signal may flow in the opposite direction to that of the above embodiment. The configuration of the base assembly 4 is not limited to that of the above embodiment and may be modified. For example, the stand 5 is not limited to being separate from the coil base 40 and may be integrated with it.

[0057] The spacers 81-84 are not limited to being made of solidified adhesive, but may be made of thin plates. For example, a thin plate may be fixed to the stand 5 and the transmission line base 3 with an adhesive. As shown in FIG. 13, the spacers 81-84 may be arranged to adjust the distance D3 between the tip of the card 54 and the upper surface of the transmission line base 3. For example, the thickness of the spacers 81-84 may be adjusted so that the distance D3 between the tip of the card 54 and the upper surface of the transmission line base 3 becomes a predetermined target distance. [Industrial Applicability]

[0058] According to the present invention, the assembly dimensions of the electromagnetic relay can be easily adjusted and degradation of high frequency characteristics can be suppressed. [Explanation of symbols]

[0059] 2: Case, 3: Transmission line base, 5: Stand, 6A: First movable contact piece, 24A: First transmission line, 25A: Second transmission line, 40: Coil base, 41: Coil block, 42: Movable block, 43: Coil, 45: Iron core, 50: Iron piece, 54: Card, 81: First spacer, 85: First base opening, 87: Stand opening

Claims

1. a transmission line base including a first transmission line and a second transmission line; a movable contact piece that is disposed on the transmission line base and is movable between a connection position for connecting the first transmission line and the second transmission line and a disconnection position for disconnecting the first transmission line and the second transmission line; A coil block including a coil; a movable block that is operated by an electromagnetic force of the coil to move the movable contact piece between the connection position and the disconnection position; a stand disposed above the transmission line base and supporting the coil block and the movable block; a spacer disposed between the stand and the transmission line base; An electromagnetic relay comprising:

2. the spacer including a layer of solidified adhesive; 2. An electromagnetic relay as claimed in claim 1.

3. The spacer includes a thin plate.

2. An electromagnetic relay as claimed in claim 1.

4. The coil block includes an iron core disposed within the coil, the movable block includes an iron piece that is attracted to the iron core by the electromagnetic force of the coil, the spacer is disposed between the stand and the transmission line base to adjust the distance between the iron core and the transmission line base; 2. An electromagnetic relay as claimed in claim 1.

5. A coil base supporting the coil block is further provided. The coil base includes an opening facing the iron core.

5. An electromagnetic relay according to claim 4.

6. the movable block includes a card disposed above the movable contact piece; The card presses the movable contact piece to move the movable contact piece to the contact position, The stand includes an opening facing the card.

2. An electromagnetic relay as claimed in claim 1.

7. a case attached to the transmission line base and covering the first transmission line, the second transmission line, the movable contact piece, and the stand; The stand and the coil block are disposed within the case so as not to come into contact with the case.

2. An electromagnetic relay as claimed in claim 1.

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