JP3588898B2 - Electromagnetic relay - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic relay, and more particularly, to a high-frequency shield structure of a high-frequency electromagnetic relay.
[0002]
[Prior art]
As a conventional electromagnetic relay with integrated movable contact piece to the armature, for example, those described in JP-flat 2-197041.
That is, as shown in FIG. 12 , a coil base 2, a permanent magnet 3, an armature block 4 and a shield block 5 are incorporated in a box-shaped base 1. As shown in FIG. 13 , the armature block 4 is formed by integrating a substantially U-shaped movable contact spring piece 7, 8 disposed on both sides of an armature 6 with a support 9 which is integrally formed. A rotating shaft 9a protrudes from the side surface of the shaft 9. The rotating shaft 9a is rotatably fitted in a concave portion 1d provided on the opening edge of the box-shaped base 1.
[0003]
Then, based on the excitation and demagnetization of the coil block 2 incorporated in the box-shaped base 1, the armature block 4 is turned around the turning shaft 9a, and the distal ends of the movable contact spring pieces 7, 8 are connected to the box-shaped base. 1, while the tips of the movable contact pieces 7, 8 alternately contact the ground contacts 5a, 5b of the shield block 5, thereby obtaining excellent high-frequency characteristics.
In FIG. 12 , reference numeral 1c denotes a terminal hole provided in the box-shaped base 1 for press-fitting the ground terminal 5c of the shield block 5.
[0004]
[Problems to be solved by the invention]
However, according to the above-described electromagnetic relay, since the shield block 5 has a complicated frame shape, not only is it troublesome to manufacture, but also it is difficult to obtain high component accuracy, and variations occur in assembly accuracy and operation characteristics. Cheap.
Moreover, since the ground terminal 5c of the shield block 5 is press-fitted into the box-shaped base 1, it is necessary to provide the terminal hole 1c in the box-shaped base 1, and there is a problem that space efficiency is poor.
[0005]
The present invention has been made in view of the above problems, and has as its object to provide an electromagnetic relay that is easy to manufacture, has no variation in assembly accuracy and operating characteristics, and has good space efficiency.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the electromagnetic relay according to the present invention, in a closed internal space in which a box-shaped case is fitted to a base block, based on excitation and demagnetization of an electromagnetic block incorporated in the base block, based on excitation and demagnetization. An armature block in which movable contact pieces are arranged on both sides of a pole rotates, and in an electromagnetic relay that opens and closes a contact, three surfaces including a ceiling surface are formed of a ground metal plate bent in a substantially U-shape and remain. The box-shaped case having two surfaces formed of side walls made of a synthetic resin material is fitted so as to cover the outer peripheral surface of the base block, and at least one end of the ground metal plate can be connected to ground, The end of the movable contact piece separated from the fixed contact can be brought into contact with the ground metal plate .
[0007]
Further, one end of the ground connection tongue may be connected and integrated with the iron core of the electromagnet block, and the ground metal plate of the case may be brought into contact with the ground connection tongue.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention with reference to the accompanying drawings of FIGS. 11.
[0009]
As shown in FIGS. 1 to 9, the electromagnetic relay according to the first embodiment includes a base block 20 formed by subjecting an electromagnet block 10 to secondary molding, a permanent magnet 30, an armature block 40, and a case 50. It consists of:
[0010]
As shown in FIG. 5, the electromagnet block 10 includes a spool 12 in which a substantially U-shaped iron core 11 is insert-molded. In the spool 12, magnetic pole portions 11a and 11b located at both ends of the iron core 11 are exposed from upper end surfaces of flange portions 13 and 14 formed at both ends of a body portion 16, respectively. A pair of relay terminals 15, 15 are insert-molded on the flanges 13, 14, respectively, and have barbs 15 a protruding from both end surfaces of the flanges 13, 14, respectively. Further, the spool 12 has a central flange portion 17 formed substantially at the center of the body portion 16, and the central flange portion 17 has an insertion hole 17a for inserting a permanent magnet 30 described later. The lead wire of the coil 18 (FIG. 3) wound around the body 16 is wrapped around the buckling portion 15 a of the relay terminals 15, 15 and soldered.
[0011]
As shown in FIG. 6, the base block 20 is formed by integrating the electromagnet block 10 and the lead frame 60 by secondary molding and then cutting off the lead frame 60.
That is, the lead frame 60 is formed by cutting and bending the fixed contact terminals 24 and 25 in which the coil terminals 21 and 22, the ground terminal 23, and the fixed contacts 24 a and 25 a are fixedly integrated, from a band-shaped hoop material.
Then, the relay terminal 15 of the electromagnet block 10 is placed on the front ends of the coil terminals 21 and 22 on the rear surface of the lead frame 60 facing upward and welded, and then subjected to secondary molding. Furthermore, the terminals 21 to 25 described above are separated from the lead frame 60 and bent from the base thereof, so that the insertion hole 17 a of the spool 10, the magnetic pole portions 11 a and 11 b of the iron core 11, the connection receiving portion 23 a of the ground terminal 23, The base block 20 exposing the fixed contacts 24a and 25a is obtained.
In FIG. 6, hatched portions indicate portions cut off after the secondary molding.
[0012]
The permanent magnet 30 has a substantially rectangular parallelepiped shape formed by sintering a rare earth element. The permanent magnet 30 is inserted into the insertion hole 17 a of the electromagnet block 10 from above, and its lower end surface contacts the upper surface of the iron core 11. After assembly, it is magnetized.
[0013]
As shown in FIG. 7, the armature block 40 has a ground relay terminal 42 made of a thin plate spring material arranged at right angles to the center of the lower surface of the armature 41, and substantially U-shaped at both ends of the upper surface of the armature 41. The movable contact pieces 43 and 44 having a shape are arranged so as to be orthogonal to the longitudinal direction, and these are integrated with the armature 41 by a support 45 formed by outsert molding.
[0014]
The armature 41 is a flat rectangular plate made of a magnetic material, and has a support projection 41c formed at the center of the lower surface thereof by projection. Further, the armature 41 has one end portion 41a with one corner portion largely cut off, and a magnetic shielding plate 41d attached to the lower surface of the other end portion 41b.
[0015]
The ground relay terminal 42 has a substantially T-shaped connecting portion 42a extending on both side ends thereof, and a fitting hole 42b for fitting the supporting protrusion 41c of the armature 41 at the center thereof. .
The ground relay terminal 42 is positioned by fitting the fitting hole 42b into the support protrusion 41c of the armature 41, and temporarily fixed by a spot-welded welded portion 42c, and then outsert-molded support. At 45, it is integrated with the armature.
[0016]
Therefore, the support projection 41c of the armature 41 is placed on the upper end surface of the permanent magnet 30, and the connection part 42a of the armature block 40 is integrally welded to the connection receiving part 23a of the ground terminal 23 insert-molded in the base block 10. As a result, the movable contacts 43a and 44a alternately face the fixed contacts 24a and 25a so as to be able to come and go.
In the present embodiment, since the movable contact pieces 43 and 44 are separated by the grounded relay terminal 42 grounded, there is an advantage that high high-frequency characteristics can be obtained.
[0017]
The case 50 has a box shape that can be fitted to the base block 20. The three sides of the case 50 are formed by a substantially U-shaped metal plate 51 cut out and bent for grounding, and the remaining two sides are formed. Is formed on the side wall 52.
[0018]
The metal plate 51 has ground connection pieces 53a and 53b extending from both side edges of the ceiling surface and is bent inward, while a substantially L-shaped ground connection tongue is formed from both ends. 54 extends.
[0019]
The side wall 52 is a resin molded product having a substantially U-shaped cross section integrally formed on the inner surface of the ceiling of the metal plate 51, and has cutouts 52a, 52b, 52c, 52d, which are fitted to respective terminals at lower end edges thereof. 52e are formed.
[0020]
Therefore, by fitting and fixing the case 50 to the base block 20 and sealing it, both ends of the movable contact pieces 43 and 44 alternately face the ground connection pieces 53a and 53b so as to be able to come and go alternately. The terminals 21 to 25 are fitted into the notches 52a to 52e of the side wall 52, respectively. The assembling operation is completed by bending the distal ends of the terminals 21 to 25 inward to form a surface-mounted electromagnetic relay.
[0021]
As a printed circuit board on which the electromagnetic relay according to the present embodiment is mounted, for example, as shown in FIG. 9, a circuit 72, 73, 74 printed on the surface of a printed circuit board 70 is surrounded by a grounded printed circuit 71. Is used.
In FIG. 9, hatched portions indicate positions where the terminals 21 to 25 and the connecting tongue pieces 54 are surface-mounted via so-called cream solder.
[0022]
Next, the operation of the self-returning electromagnetic relay assembled as described above will be described.
First, when no voltage is applied to the coil 18 and the electromagnet block 10 is not excited, one end 41 b of the armature 41 is attracted to the magnetic pole portion 11 b of the iron core 11 by the magnetic force of the permanent magnet 30, and the movable contact 44 a 8 contacts the fixed contact 25a, while both ends of the movable contact piece 43 contact the connection piece 53a of the case 50 and are grounded, as shown in FIG.
[0023]
In addition, the shield structure of the movable contact pieces 43 and 44 is not limited to the one described above. For example, the connection pieces 53a and 54a do not extend from the metal plate 51 but are attached separately from the metal plate 51. It may be formed. In addition, a protrusion formed on the ceiling surface of the metal plate 51 by a protrusion process may be used as a substitute for the connection pieces 53a and 54a. Next, as shown in FIG. 8B, the bent free end portion 43 b of the movable contact piece 43 may contact the ceiling surface of the metal plate 51. Further, it goes without saying that the shield structure may be configured by appropriately combining the above-described modifications.
[0024]
When a voltage is applied to the coil 18 in a direction in which a magnetic flux for canceling the magnetic flux of the permanent magnet 30 is generated, one end 41b of the armature 41 repels the magnetic pole 11b of the iron core 11, and the magnetic pole 11a contacts the magnetic pole 11b. The other end 41a of the pole element 41 is sucked. Therefore, the armature 41 rotates against the magnetic force of the permanent magnet 30, the movable contact 44a is separated from the fixed contact 25a, and the movable contact 43a contacts the fixed contact 24a. 41 a is attracted to the magnetic pole portion 11 a of the iron core 11. At this time, both ends of the movable contact piece 44 contact the connection piece 53b of the case 50 and are grounded.
[0025]
Then, when the excitation is released, the magnetic balance of the armature block 40 is lost, so that the armature block 40 rotates in the opposite direction as described above, and the movable contact 44a contacts the fixed contact 25a while the movable contact piece Both ends of 43 contact the connection piece 53a of the case 50 and are grounded, and return to the original state.
[0026]
In the second embodiment, as shown in FIGS. 10 and 11, the first embodiment described above is a case where the grounding is performed via a connecting tongue piece 54 extending from the metal plate 51 of the case 50. This is a case where the ground is connected via a connecting tongue piece 11c welded to the vicinity of the edges of the magnetic pole portions 11a and 11b of the iron core 11.
[0027]
In this embodiment, as shown in FIG. 11, similarly to the first embodiment, the electromagnet block 10 is positioned on the lead frame 60, and one end of the connection tongue 11c cut out from the lead frame 60 is connected to the magnetic pole portion. After being welded and integrated near the edges of 11a and 11b, the base block 20 is formed by secondary molding. Next, the base block 20 is separated from the lead frame 60, and the terminals 21 to 25 and the connecting tongue piece 11c are bent from the base. The other parts are the same as those of the first embodiment, and the description is omitted.
[0028]
According to this embodiment, as described above, the movable contact pieces 43 and 44 alternately contact the connection pieces 53a and 53b of the case 51, and the case 51 contacts the connection tongue piece 11c and is grounded. In addition, since the iron core 11 is grounded via the connecting tongue piece 11c, there is an advantage that more excellent high-frequency characteristics can be obtained.
[0029]
In the above-described embodiment, the case where the present invention is applied to a self-recovering type electromagnetic relay has been described. However, the present invention is not limited to this. It may be.
In addition, the armature block is not limited to the one in which the substantially U-shaped movable contact pieces are arranged on both sides of the armature, and may be, for example, one in which straight movable contact pieces are arranged orthogonally on both sides.
[0030]
【The invention's effect】
As is apparent from the above description, according to the electromagnetic relay of claim 1 of the present invention, three surfaces including the ceiling surface are formed by the ground metal plate bent in a substantially U shape , and the remaining two surfaces are formed. The box-shaped case formed of a side wall made of a synthetic resin material is fitted so as to cover the outer peripheral surface of the base block, and at least one end of the ground metal plate can be connected to ground, and the fixed contact is The separated end of the movable contact piece is disposed so as to contact the ground metal plate . For this reason, it is not necessary to form a shield block having a complicated shape as in the conventional example, which not only facilitates manufacturing, but also improves component accuracy and assembly accuracy and eliminates variations in operating characteristics.
If the case is grounded, the movable contact piece can be grounded without passing through a separate ground terminal. For this reason, there is no need to provide a terminal hole for the ground terminal in the base as in the conventional example, so that the space efficiency is improved.
Further, even when the base block is covered with the box-shaped case, it is not necessary to deeply draw one metal plate, and the manufacture is easy.
According to the second aspect , since the grounding connection tongue is integrally connected to the iron core, not only the movable contact piece can be shielded through the case, but also the electromagnet block is shielded through the grounding connection tongue. This has the effect of further improving the high frequency characteristics.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a first embodiment of an electromagnetic relay according to the present invention.
FIG. 2 is a partial plan sectional view of the electromagnetic relay shown in FIG. 1;
FIG. 3 is a front partial sectional view of the electromagnetic relay shown in FIG. 1;
FIG. 4 is a partial side sectional view of the electromagnetic relay shown in FIG. 1;
FIG. 5 is a perspective view of an electromagnet block.
6 is a plan view showing a state where the electromagnet block shown in FIG. 5 is secondarily formed on a lead frame.
7A and 7B show an armature block, wherein FIG. 7A is a bottom view and FIG. 7B is a partial front sectional view.
8A and 8B show an operation state of the movable contact piece. FIG. 8A is a partially enlarged view, and FIG. 8B is a partially enlarged view showing a modification of FIG. 8A.
FIG. 9 is a perspective view showing a printed wiring on a printed circuit board.
FIG. 10 is an exploded perspective view showing a second embodiment of the electromagnetic relay according to the present invention.
11 is a plan view showing a state where the electromagnet block shown in FIG. 10 is secondarily formed on a lead frame.
FIG. 12 is an exploded perspective view showing an electromagnetic relay according to a conventional example.
FIG. 13 is a plan view of the armature block shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Electromagnet block, 11c ... Connection tongue, 20 ... Base block, 21, 22 ... Coil terminal, 23 ... Ground terminal, 23a ... Connection receiving part, 24, 25 ... Fixed contact terminal, 24a, 25a ... Fixed contact, 30 ... permanent magnet, 40 ... armature block, 41 ... armature, 42 ... ground relay terminal, 42c ... welding part, 43, 44 ... movable contact piece, 43a, 44a ... movable contact, 45 ... support, 50 ... case, 51: Metal plate, 52: Side wall, 53a, 53b: Connection piece, 54: Connection tongue piece.

Claims (2)

Based on the excitation and demagnetization of the electromagnet block incorporated in the base block, the armature block having movable contact pieces on both sides of the armature is rotated in the enclosed inner space by fitting the box-shaped case to the base block. In the electromagnetic relay that operates and opens and closes the contacts,
The outer peripheral surface of the base block is covered with the box-shaped case in which three surfaces including a ceiling surface are formed by a ground metal plate bent in a substantially U-shape , and the remaining two surfaces are formed by side walls made of a synthetic resin material. So that at least one end of the ground metal plate can be connected to the ground, and the end of the movable contact piece separated from the fixed contact can be brought into contact with the ground metal plate. An electromagnetic relay characterized by the following. 2. The grounding tongue piece of the case is brought into contact with one end of a grounding tongue piece connected and integrated with the iron core of the electromagnet block. Electromagnetic relay as described.

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