JPS6157645B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay suitable for use on printed circuit boards.

Conventional electromagnetic devices have complex structures for electromagnetic and electrostatic shielding, making it difficult to miniaturize them.

By making effective use of space, this invention
An object of the present invention is to provide an electric relay that has sufficient electromagnetic and electrostatic shielding effects even if it is extremely small.

Hereinafter, the implementation of this invention will be explained with reference to FIGS. 1 to 7.

As shown in these drawings, this electromagnetic relay includes an electromagnet part 100, a movable part 200, and a base 30.
0 are sequentially stacked. The electromagnet section 100 is composed of a king-shaped core 110 and two coils 130 and 131 wound around two spools provided at the center of the core 110, and a hole 140 is provided at the center. . When the coil 130 is energized, the ends 112, 121, 1 of the core 110
23 is the S pole, and the ends 111, 113, 122 are the N pole.
Excited to the pole. Moreover, when the coil 131 is energized, the end 1 of the core 110 is
11, 113, 122 are S poles, ends 112, 1
21 and 123 are magnetized to the north pole (see FIG. 4).

The movable part 200 has permanent magnet pieces 211, 21 at one end.
2, 213, and permanent magnet pieces 221, 22 at the other end.
2, 223, and is made of synthetic resin so that it has a rectangular ring shape so that the lower part of the two coils 130, 131 can pass through when the electromagnet part 100 is stacked on top, and has a shaft part 230 in the center. Insert molded. Also, the permanent magnet piece 21
2, 222 is the upper surface (the core 11 of the electromagnet part 100
0) is the S pole, and the permanent magnet piece 211,
213, 221, and 223 are arranged so as to face the north pole (see FIG. 3).

The base 300 includes a large number of terminal pieces 1a to 12a, 1b to 12b formed from a single copper plate, and is insert-molded into a box shape from synthetic resin, and then a metal shield plate 360 with good conductivity is added to the base 300. Insert molded to contain. Also base 30
A bearing part 350 and a hole part 31 are provided in the center step part inside 0.
0, and step portions 321 to 326 are provided on both the left and right sides, respectively (see FIG. 5). Note that the terminal pieces 1a and 1b are the terminals of the coil 130, and the terminal pieces 12
a and 12b serve as terminals of the coil 131.
Further, the terminal pieces 6a, 6b and 7a, 7b are connected to the shield plate 360 and form a ground terminal.

Here, the ends of each of the terminal pieces 2b to 5b extend inside the base 300 to the center of the base 300, as shown by dotted lines in FIG.
Each movable contact piece 330 is spot-welded to the end near the center on the back side of the base 300 (see FIG. 7). Furthermore, each terminal piece 2a to 5a
The end of the base 3 is connected to the base 3 as shown by the dotted line in FIG.
It extends to the left side of 00 (terminal piece 2a, 2b side), and a contact member 340 is spot welded thereto. With such a configuration, the terminal pieces 2a to 5a, 2
b to 5b form a contact circuit on the left side portion of the base 300. Similarly, terminal pieces 8a to 11
a, 8b to 11b also form a contact circuit section on the right side of the base 300.

Next, the assembly work will be explained. base 3
If the movable part 200 is inserted from the top of 00, the shaft part 2
30 is inserted into the bearing part 350 from the upper open part to form a hinge part. As a result, the movable part 200 is aligned with the center line of the shaft part 230 (1 in FIGS. 1 and 3).
It is precisely installed in the base 300 so that it can rotate within a predetermined angle around the center (indicated by the dotted chain line). Further, since the shape of the movable part 200 and the shape and dimensions of the inside of the base 300 are substantially the same, the above-mentioned insertion operation can be easily performed.

Furthermore, when the electromagnet part 100 is stacked on the movable part 200, the left and right ends 111-113, 121-123 of the core 110 of the electromagnet part 100 engage with the grooves 321-326 provided in the base 300, respectively, so that the electromagnet The part 100 will be placed precisely in a predetermined position within the base 300.

Then, the metal screw 600 is passed through the hole 140 of the electromagnet part 100 and inserted into the hole 310 of the base 300.
If the electromagnet part 100 is inserted into a
is completely fixed within the base 300, and
The core 110 is connected to the shingle plate 360 via this screw 600. Moreover, since the core 110 of the electromagnet part 100 completely closes the upper open part of the bearing part 350, the movable part 200 is also rotatably fixed within the base 300.
Furthermore, by attaching the case 400 to the upper surface of the base 300 and the bottom plate 500 to the lower surface, the inside of the electromagnetic relay is sealed and the assembly work is completed.

Next, the operation will be briefly explained. coil 1
31, the right end portions 121, 122, and 123 of the core 110 are excited to the N, S, and N polarities, respectively, as described above. Also, permanent magnet pieces 221, 2 of the movable part 200 facing each end
The opposing surfaces of 22 and 223 are respectively magnetized to N, S, and N polarities. Therefore, the right end of the movable part 200 is repelled by the core 110. On the other hand, core 11
The left end portions 111, 112, 113 of 0 are excited to the S, N, and S polarities, respectively, and the permanent magnet pieces 211, 21 of the movable portion 200 opposite to these end portions
The opposing surfaces of No. 2 and 213 are respectively magnetized with N, S, and N polarities. Therefore, the left end of the movable part 200 is attracted to the core 110. When the coil 131 is energized as described above, the movable part 200 is driven so that the left end is attracted to the core 110. Further, even if the coil 131 is de-energized after this, the movable part 200 will not be able to maintain the permanent magnet piece 211 on the left end side,
The left side remains attracted to the core 110 by the magnetic forces 212 and 213. In this state, the convex portion 250 provided on the right end side of the movable portion 200 makes movable contact with the contact circuit portion (consisting of terminal pieces 8a to 11a, 8b to 11b) provided on the right side in the base 300. The end of piece 330 will be pressed down (see Figure 2). Therefore, the contact between the movable contact piece 330 and the contact member 340 is suddenly cut off, and
The terminal pieces 1a and 11b are in an off state.

Next, when the coil 130 is energized, each end of the core 110 is excited with a polarity opposite to that of the coil 131, as described above. Therefore, the right end of the movable part 200 is attracted to the core 110 (the left end is repelled). Therefore, the convex portion 250 of the movable part 200 is connected to the movable contact piece 3.
30 is released, the convex portion 240 pushes down the movable contact piece 330 of the contact circuit section (consisting of the terminal pieces 2a to 5a and 2b to 5b) provided on the left side in the base 300. Therefore, this time 2a-2b, 3a-3b, 4a-4
b, between each terminal piece 5a-5b is in the off state,
8a-8b, 9a-9b, 10a-10b, 11
The terminal pieces a-11b are in an on state. In this state, even if the current to the coil 131 is cut off, the right end side of the movable part 200 is connected to the permanent magnet piece 221,
It remains attracted to the core 110 by the magnetic force of the magnets 222 and 223, and thus is retained.

As described above, the movable part 200 is driven around the shaft part 230 with the excitation of the electromagnet 100, and performs a so-called see-saw movement to control the contact circuit part. Furthermore, when the two coils 130 and 131 whose excitation polarities are opposite to each other are energized, the relay is a latching type electromagnetic relay that maintains its operating state even if the energization is interrupted. On the other hand, the excitation polarities of the two coils 130 and 131 are made the same, and a permanent magnet piece is provided only on one end side of the movable part 200 and a soft magnetic material piece is provided on the other end side.
When the coils 30 and 131 are not energized, one end of the movable part 200 is attracted to the core 110 by the magnetic force of the permanent magnet piece, and when both the coils 130 and 131 are energized, the excitation of the core 110 causes this one end side (permanent magnet piece) to be attracted to the core 110. It is also possible to make it repel and attract the other end (soft magnetic material piece). In this case, the contact circuit section is controlled depending on whether the coil is energized or not, so it is configured as a single stable type electromagnetic relay. It goes without saying that the configuration of the contact circuit section can be freely set, such as by providing not only make contacts and break contacts but also a common terminal piece that connects terminals connected to the movable contact piece to form a switching contact.

As described above with respect to the embodiments, according to the present invention, the shield plate is made of a metal plate with good conductivity and is connected to the grounding terminal piece, so that static electricity is prevented from being applied to the contact circuit. The shielding plate effectively performs shielding and electromagnetic shielding. Moreover, since the core of the magnetic material constituting the electromagnet section is similarly connected to each of the ground terminal pieces, electromagnetic shielding is effectively performed by this core as well. Furthermore, since the core and each grounding terminal piece are connected via screws that firmly fix the electromagnetic portion to the base, no connecting member is required, which is rational. In addition, since the shield plate is insert-molded into the base together with a large number of terminal pieces, it does not structurally become an obstacle to miniaturization, especially thinning of the electromagnetic relay. Furthermore, the shield plate not only has a shielding effect, but also functions as a reinforcing plate to ensure the mechanical strength of the base, contributing to stable operation.

[Brief explanation of the drawing]

1 and 2 are longitudinal and transverse sectional views showing an embodiment of the present invention, FIG. 3 is a plan view showing the movable part 200 stacked on the base 300, and FIG. FIG. 5 is a plan view showing the front side of the base 300, FIG. 6 is a plan view showing the back side of the base 300, and FIG. 7 is a plan view showing the back side of the base 300.
FIG. 3 is a plan view showing a movable contact piece 330 attached to the back side of 00. 100... Electromagnet section, 110... Core, 200
... Movable part, 300 ... Base, 330 ... Movable contact piece, 340 ... Contact member, 360 ... Shrinkage plate, 600 ... Screw.

Claims (1)

[Claims] 1 A large number of terminal pieces made of one metal with good conductivity and a flexible plate made of metal with good conductivity connected to the grounding terminal piece of the terminal pieces are formed, and the terminal A base formed by insert-molding a piece and a shield plate with synthetic resin, a contact circuit section provided on the back side of this base, and such that the shield plate is sandwiched between this contact circuit section. A metal fastener comprising a movable part installed on the front side of the base to drive the contact circuit part, and an electromagnet part laminated together with the movable part on the front side of the base to attract or repel the movable part. The electromagnet part is fixed to the front side of the base by a member, and at the same time, the fastening member makes an electrical connection between a core around which a coil is wound in the electromagnet part and the shield plate. electromagnetic relay.