JP2000222992A - Micro relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accurate and stabilized operation by loading a base with a coil plate having insertion hole for insertion of attracting parts of an iron core and coils in the periphery of the insertion holes, and a movable plate for moving a movable contact provided at the end thereof to a fixed contact for switching in this order, and sealing the top part with a cover provided with a permanent magnet for swingably supporting the movable plat. SOLUTION: An iron core 2 and a coil plate 3 having insertion holes 17, into which attracting parts 13a, 13b of the iron core are inserted and exposed over, and coils 18 wounded in the periphery of the insertion holes 17 are provided on a base 1. A movable plate 4 to be attracted by the attracting parts 13a, 13b so that a movable contact 23 of a movable contact piece 22 is moved to a fixed contact 15 of the iron core 2 of insulating body arranged opposite to the movable contact is laminated on the coil plate 3. Furthermore, the movable plate 4 is sealed by a cover 5 provided with a permanent magnet for supporting the movable contact piece 22 at a support point freely to be rocked. With this structure, mechanical strength of the cover 5 is improved, and accuracy of the positioning of the movable plate 4 for support is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin microrelay that performs a polarized operation.

[0002]

2. Description of the Related Art FIG. 13 shows a conventional thin micro relay (International Application No. PCT / JP97).
/ 01425).

This micro relay has a base 100,
The core member 101, the coil plate 102, and the movable plate 103 are sequentially stacked and closed by a cover (not shown). A recess 104 is formed in the base 100. The iron core member 101 has a fixed contact 105
And a pair of plate-like bodies having a suction portion 106 which is provided in the recess 104 of the base 100. The coil plate 102 is formed by forming a pair of through holes 107 through which the respective suction portions 106 of the iron core member 101 are inserted in an insulating substrate, and arranging a coil 108 in a spiral shape around the pair of through holes 107. The movable plate 103 is configured such that the contact piece 110 is drivably supported by one hinge portion 109 by notching the elastic plate-shaped body. Movable contacts (not shown) that are in contact with and separate from the fixed contact 105 are formed on the lower surfaces of both ends of the contact piece 110, respectively, to form a so-called double break contact structure.

In the micro relay, the movable contact is closed to the fixed contact 105 by energizing the coil 108 and attracting the contact piece 110 of the movable plate 103 to the attracting portion 106 of the two core members 101 to close the movable contact to the fixed contact 105. 112 are electrically connected (hereinafter, this configuration is referred to as a 1a contact).

[0005]

However, the micro-relay is designed to open and close the contacts depending on whether the coil 108 is energized or not, and to open or close the contacts without energizing the coil 108. It does not have a latching structure for maintaining either. Therefore,
In order to maintain a conductive state between the terminals 111 and 112, it is necessary to keep energizing the coil 108, and there is a problem that power consumption is large. In this case, for example,
As shown in Japanese Patent Publication No. 218028, it is necessary to use a polarized relay having a permanent magnet. However, the permanent magnet having the configuration described in this publication is directly applied to the thin micro relay because of the arrangement space and the like. It is impossible to do. Further, in the micro relay, the designable configuration is the aforementioned 1a contact, and as described in the above publication,
It is not possible to obtain a versatile 1c contact for electrically opening and closing between the common terminal and the other two terminals. That is,
When the micro relay is made thin, it is impossible to obtain a latching structure having a permanent magnet, particularly a 1c contact structure.

Accordingly, an object of the present invention is to provide a micro relay having a thin, latching structure having a permanent magnet, particularly a 1c contact structure.

[0007]

According to the present invention, as a means for solving the above-mentioned problems, a micro relay is mounted on a base, an iron core having a suction portion at at least one end, and a core inserted through the suction portion of the iron core. And a coil plate having a coil disposed in a wound state around the insertion hole, and a coil plate disposed above the coil plate, at least one end of which is sucked by the suction portion of the iron core. By doing so, a movable plate that opens and closes a movable contact provided at the end is mounted on a fixed contact disposed opposite to the movable contact, and the movable contact is closed with a cover having a permanent magnet that swingably supports the movable plate. is there.

[0008] With this configuration, the movable plate can be swingably supported by a permanent magnet provided on a cover that can be formed with high precision, instead of a coil plate that is difficult to obtain dimensional accuracy in the thickness direction. And the cover itself,
The provision of the permanent magnet improves the mechanical strength.

It is preferable that the permanent magnet comprises a fulcrum for swingably supporting the movable plate and an extended portion extended so as not to interfere with the movable plate.

With this configuration, the positions where the N and S poles of the permanent magnet are exposed are spaced apart from the fulcrum of the movable plate and the end of the extended portion, thereby suppressing the demagnetizing field despite its thinness. It is possible to do.

When a through hole is formed in the suction portion of the iron core and a fixed contact member having a fixed contact is provided in the through hole, the magnetic path and the electric path are arranged in the same area, so that the occupied space can be suppressed. It is preferred in that respect.

The base is formed in a box shape opening upward, and the movable plate is provided with a movable piece which is sucked and swung by a suction portion of the iron core, and a movable contact which is integrated with the movable piece and has a movable contact on an upper surface of an end portion. The cover may be formed in a plate shape, and a fixed contact to which the movable contact comes and goes may be formed on the lower surface of the cover.

The base is formed in a plate shape, and a support base and a fixed contact base having a fixed contact are formed on an upper surface thereof, and the movable plate is supported by the support base and sucked by the suction part of the iron core. And a contact piece that is integrated with the movable piece and has a movable contact on the upper surface of the end that comes into contact with and separates from the fixed contact.

The movable plate is swingably supported at the center portions on both sides, and at least one end portion is extended to the outside and a movable contact piece sucked by the suction portion of the iron core, and is sandwiched between a base and a cover. And a clamping receiving portion that is
This is preferable in that the movable plate can be operated stably.

[0015] A biasing means may be formed on a part of the movable plate to abut on one of the components to bias the movable plate to a specific swing position.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a micro relay according to the present embodiment. This micro relay generally comprises a base 1, an iron core 2, a coil plate 3, a movable plate 4, and a cover 5.

The base 1 has a thin box shape and is formed by injection molding of a synthetic resin or sintering of a ceramic. In the base 1, as shown in FIG. 3, a recess 6 is formed on the upper surface,
Steps 8a and 8b are provided on the inner surfaces of the side walls 7a and 7b, respectively. Escape recesses 9 are formed in the steps 8a and 8b, respectively. A rectangular positioning recess 10 is formed at the center of the recess 6. Also base 1
Is plated, for example, MID (Molded Interconnect)
The coil wire 11 and the signal wire 12 are formed by the (Device) technology. The coil wire 11 is formed on one side wall 7 b of the base 1, and a coil terminal portion (not shown) on the bottom side edge of the base 1 and a coil connection receiving portion 11 a on the bottom surface near the side wall of the recess 6. And are formed so as to connect On the other hand, the a and b contact signal lines 12 a and 12 b are formed on the other side wall 7 a side of the base 1, and the a and b contact terminal portions 12 a 1 and 12 b 1 on the bottom side edge of the base 1 and the positioning recess 10. It is formed so as to connect the a and b contact connecting portions (not shown) on the bottom surface. Also, the signal line 12c for the c contact
Is formed between the signal lines 12a and 12b, and c
The contact terminal portion (not shown) is located on the bottom surface of the base 1, and the c-contact connecting portion 12 c 1 is located on the step portion 8. In addition, 12d is a dummy auxiliary terminal portion.

The iron core 2 has a plate shape and has suction portions 13a at both ends.
13b is protruded. Materials usable for the iron core 2 include iron alloys such as permalloy, silicon iron, soft magnetic iron, and magnetic stainless steel, and MIM (Metal Injection Mo).
ld) It can be easily formed by a technique or the like. Iron core 2
If electrical insulation is required, soft ferrite or the like may be used. A through hole 13c is formed at the center of the suction portions 13a and 13b, and a fixed contact member 14 is formed therein.
Are arranged respectively. The fixed contact member 14 is made of a copper alloy, has a stepped upper portion, and the fixed contact 15 is formed by plating gold or the like on the upper portion. The fixed contact is
It is positioned so as to slightly protrude from the upper surfaces of the suction portions 13a and 13b. The iron core 2 is disposed in the positioning recess 10 of the base 1 and, in that state, the fixed contact member 14
Of the a and b contact signal lines 12a and 12b
The b-contact connecting portions 12a1 and 12b1 come into contact with each other.

The coil plate 3 has a thin plate shape, and has a substantially square insertion hole 17 formed at two places on both sides, and a coil 18 is embedded around the hole. The coil 18 is connected to coil connection receiving portions 19 formed at both ends thereof at positions facing the respective coil connection portions of the base 1,
It is arranged in a wound state along the shape of the insertion hole 17. As the coil 18, for example, a print coil (manufactured by Asahi Kasei Corporation) or a fusion wire can be used. In addition,
Reference numeral 16 denotes a stopper for preventing deformation of the movable plate 4 even when an impact force acts on the micro relay.

The movable plate 4 is a thin plate formed by joining and integrating a soft magnetic material and a spring material. Examples of the method for joining the soft magnetic material and the spring material include resistance welding, laser welding, caulking, and rolling clad. A movable contact piece 22 is formed at the center of the movable plate 4 by a substantially U-shaped first cutout portion 20 and the center of both sides is swingably supported by a hinge portion 21. Movable contacts 23a and 23b are provided on the lower surfaces of both ends of the movable contact piece 22, respectively. The movable contacts 23a and 23b are formed by joining a bulk noble metal by resistance welding, laser welding, caulking, or the like, or by printing and firing a noble metal paste. The first cutout 2 is provided on both sides of the movable contact piece 22.
The second cutouts 24 are formed further on the sides of 0. The second cut portion 24 is for facilitating the swing of the movable contact piece 22.

The cover 5 has a plate shape and is formed by injection molding of a synthetic resin or sintering of a ceramic, similarly to the base 1. On the lower surface of the cover, as shown in FIG. 4, a thin permanent magnet 25 having a substantially H shape is formed. Thereby, even if the cover 5 itself is formed thin, the permanent magnet 25
Thereby, the mechanical strength is improved. Therefore, the cover 5
Is not deformed by the chuck at the time of mounting after the completion of the electromagnetic relay or deformed by expansion of the internal air at the time of reflow. The permanent magnet 25 includes a fulcrum 26 for swingably supporting the movable plate 4 and a movable contact piece 22.
Extension 2 extending at predetermined intervals along the side edges of
7. Thereby, the polarity of the permanent magnet 26 can be exposed to the fulcrum portion 26 and the four end portions of the extension portion 27, and the demagnetizing field can be suppressed. As a result, a thin, inexpensive magnet having a small coercive force and energy product can be used as the permanent magnet 25, and the microrelay can be formed thin and inexpensively.

Each component having the above-described configuration can be easily assembled by sequentially stacking the iron core 2, the coil plate 3 and the movable plate 4 on the base 1, and closing the cover with the cover 5.

That is, the iron core 2 need only be disposed in the positioning recess 10 of the base 1 and bonded with a thermosetting or ultraviolet curable adhesive or the like. The coil plate 3
Simply by placing it in the recess 6 of the base 1, its rectangular hole 13c
The suction portions 13a and 13b of the iron core 2 are positioned at the position. At this time, the coil plate 3
Is electrically connected to the coil terminal connection receiving portion 11a of the base 1. The movable plate 4 is placed on a step 8 formed above the side wall 7 of the base 1. At this time, the side edge 4a of the movable plate 4 is
And the c-contact connecting portion 12c1 of the base 1 are electrically connected. The cover 5 fits into the opening edge of the recess 6 of the base 1. Thus, the side edge of the movable plate 4 is sandwiched between the step 8 of the base 1 and the cover 5. Further, the fulcrum 26 of the permanent magnet 25 abuts on the center of the movable contact piece 22,
The movable contact piece 22 is swingably supported. The fitting surface between the base 1 and the cover 5 is sealed with a sealant or the like.

Next, the operation of the micro relay having the above configuration will be described.

When the coil 18 is energized, the one attracting portion 13a of the iron core 2 is set to the S pole, and the other attracting portion 13b is set to the N pole. The movable contact piece 22 has N poles at both ends because the N poles of the permanent magnets 25 are in contact at the center. Therefore,
The movable contact piece 22 has a suction portion 13a having an S pole at one end.
13b, the other end of which receives the suction force from
2, it rotates around the fulcrum 26 of the permanent magnet 25 in the clockwise direction in FIG.
3a closes to the fixed contact 15a. In this case, coil 1
Even when the energization of the permanent magnet 25 is stopped, the end of the movable contact piece 22 is kept in contact with the attraction portion 13a of the iron core 2 by the attraction force of the permanent magnet 25.

On the other hand, when the direction of current supply to the coil 18 is changed, the polarities of the attraction portions 13a and 13b are reversed, and the movable contact piece 22 is centered on the fulcrum 26 of the permanent magnet 25 as shown in FIG. Then, the movable contact 23a rotates counterclockwise, the movable contact 23a moves away from the fixed contact 15a, and the movable contact 23b closes to the fixed contact 15b. Again,
As described above, even if the energization of the coil 18 is stopped, the end of the movable contact piece 22 is
Is maintained in contact with the suction unit 13b.

In the micro relay having the above-described structure, the movable plate 4 is supported by the permanent magnet 25 provided on the cover 5 formed with high precision, and its side edge is located between the base 1 and the cover 5. Since it is pinched, it swings stably. In addition, when the contact closed state is maintained, the operation of the permanent magnet 25 does not require the coil 18 to be continuously energized, and power consumption can be suppressed.

In the above embodiment, the permanent magnet 25
Is substantially H-shaped including the support portion 26 and the extension portion 27. However, the extension portion 27 is not necessarily required if a sufficient coercive force and energy product can be obtained even with the configuration of the support portion 26 alone. is not. In this case, handling of the cover 5 becomes easy, and assembly to the base 1 can be easily performed.

In the above-described embodiment, the opening / closing position of the contact is switched by changing the direction of energization in the coil 18, but the following configuration may be adopted.

That is, as shown in FIG. 5, a pressing piece 28 as an urging means is formed on the movable plate 4. The pressing piece 28 can be formed at the center of one end side of the movable contact piece 22 of the movable plate 4 by cutting and raising by press working or the like. The tip of the pressing piece 28 is pressed against the cover 5, the coil plate, or the like, and when the coil 18 is not excited, one end of the movable contact piece 22 contacts one end of the iron core 2, and one of the movable contacts 23 b Are closed to the opposed fixed contact 15b. When the coil 18 is excited to attract the other end of the movable contact piece 22 to the other end of the iron core 2,
The other movable contact 23a is closed to the opposed fixed contact 15b, and the contact closing position is switched.

FIG. 6 shows a micro relay according to another embodiment.

In this micro relay, the base 41 is
A step 46 is formed only at the center of the side walls 41a and 41b. The signal line 47 for the c-contact is formed at the center of both sides,
The c-contact connecting portions 47a are exposed on the upper surfaces of the step portions 46, respectively. Also, signal lines 48 and 4 for a and b contact points
9 are connected to the side walls 41a, 41a.
b, the coil wire 50 is exposed at the upper surface at both ends.
1c.

The upper surface of the suction portions 51 at both ends of the iron core 42 bulges upward in an arc shape.

The coil plate 43 has a plate-like configuration having two rectangular holes 43a at both ends and a stopper 41b at the center, as in the above-described embodiment.
c, the built-in coil 43c (FIG. 8) is electrically connected to the coil wire 50 via a terminal (not shown) on the lower surface.

The movable plate 44 has hinge portions 53 extending from central portions on both sides of the movable piece 52.
3 form an approximately T-shaped electrical connection portion 54. The electric connection portion 54 is provided on the step portion 4 of the base 41.
6 and is electrically connected to the c-contact connecting portion 47a. A contact piece 55 is formed between one of the electric connection portions 54 and the movable piece 52, and movable contacts 56a and 56b are formed on the upper surfaces of both ends thereof.

As shown in FIG. 7, the cover 45 has a substantially H-shaped permanent magnet comprising a semi-cylindrical supporting portion 58 and an extending portion 59 extending from the supporting portion 58, similarly to FIG. 4. 5
Seven. A contact connecting portion 60 is formed in the vicinity of one end of the one extending portion 59, and is electrically connected to the connecting portions 48a, 49a of the signal lines 48, 49 for the a and b contact. ing. In addition, each contact connection section 6
0 is provided with fixed contacts 60a and 60b, respectively.
The movable contacts 56a and 56b are opened and closed.

According to the micro relay shown in FIG.
It is possible to reduce the thickness while increasing the area of the magnetic pole exposed at the suction portion 51 of the iron core 42.

FIG. 9 shows a micro relay according to still another embodiment.

In this micro relay, the base 61 is
The support base 66 is formed in a substantially flat plate shape at the center of both sides, and the fixed contact bases 67 are formed on both sides of one support base 66, respectively. On the upper surface of one support base 66, a c-contact connecting portion 68a of the c-contact signal line 68 is provided.
7, fixed contacts 68 of signal lines 68 and 69 for a and b contacts.
a and 69a are respectively exposed. In addition, 70 is a coil wire for energizing the coil 63a (FIG. 11).

The iron core 62 and the coil plate 63 have the same configuration as that shown in FIG.

The movable plate 64 has the same structure as that shown in FIG. 6 except that the movable piece 72, the hinge portion 73 and the electrical connection portion 74 are different from each other in the shape of the contact piece 78. Movable contacts 79a, 79b are
4 in that it is bent so as to be located on the same straight line as 4.

As shown in FIG. 10, the cover 65 has a substantially box-like shape with an open lower surface. As shown in FIG.
A substantially H-shaped permanent magnet 76 composed of an extension 76b extending from 6a is formed.

According to the micro relay shown in FIG.
When assembling the cover 65 to the base 61, the inner surface of the side wall of the cover 65 is guided by the support base 66 and the fixed contact stand 67, so that the assembling workability can be improved.

In the above embodiments, two coil terminal portions are provided. However, as shown in FIG.
In addition to the two coil terminal portions 82 and 83, a third coil terminal portion 84 may be provided in the middle of the coil plate portion 81 mounted on the base 80 in addition to the two coil terminal portions 82 and 83. According to this, by applying a voltage between any one of the coil terminal portions 82 and 84 or between the coil terminals 83 and 84 to energize the coil 85, the polarity appearing in the suction portion 85 can be changed. . If the winding direction of the coil 85 around the suction portion 86a of the iron core 86 is reversed in the same manner as in the above-described embodiments, a large suction force is applied by applying a voltage between the coil terminal portions 82 and 83. It is also possible to get Further, by providing the third coil terminal portion 84,
A two-coil circuit configuration suitable for using a semiconductor logic circuit to energize the coil 85 is obtained.

[0046]

As is clear from the above description, according to the micro relay of the present invention, even if the micro relay has a thin plate having a coil plate, the mechanical strength of the cover can be reduced by providing the permanent magnet on the cover. It is possible to obtain a stable operation by improving the support position of the movable plate with high accuracy.

Further, since the permanent magnet is formed to be thin so as to suppress the demagnetizing field composed of the fulcrum portion and the extended portion, it is possible to obtain a relay having a latching structure 1c contact despite being thin. It becomes possible.

Further, a through hole is formed in the suction portion of the iron core, and a fixed contact member having a fixed contact is provided in the through hole, or a fixed contact is provided in the cover, so that the size can be further reduced. Can be.

When the movable plate has a structure having a movable contact piece which is swingably supported at a center portion on both sides, and a holding portion which extends outward and is held between a base and a cover, The swing operation of the movable contact piece can be stabilized, and a relay having excellent operation characteristics can be provided.

Since the biasing means is formed on a part of the movable plate to abut on one of the components and biases it to a specific swing position, the initial state of the movable plate can be set to a specific position. Thus, a relay having a 1c contact structure having a so-called single stable operation can be realized.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a micro relay according to an embodiment.

FIG. 2 is a cross-sectional view of the micro relay shown in FIG.

FIG. 3 is a plan view of the base shown in FIG. 1;

FIG. 4 is a perspective view of a cover shown in FIG. 1;

FIG. 5 is a perspective view of a movable plate according to another embodiment.

FIG. 6 is an exploded perspective view of a micro relay according to another embodiment.

FIG. 7 is a perspective view of a movable plate and a cover shown in FIG.

8 is a cross-sectional view of the micro relay shown in FIG.

FIG. 9 is an exploded perspective view of a micro relay according to another embodiment.

FIG. 10 is a perspective view of a movable plate and a cover shown in FIG.

11 is a cross-sectional view of the micro relay shown in FIG.

FIG. 12 is a plan view showing a state where a coil plate is assembled to a base according to another embodiment.

FIG. 13 is a front view of a micro relay according to a conventional example.

[Explanation of symbols]

 1, 41, 61 ... Base 2, 42, 62 ... Iron core 3, 43, 63 ... Coil plate 4, 44, 64 ... Movable plate 5, 45, 65 ... Cover 6 ... Recess 11 ... Coil wire 12a ... For a contact Signal line 12b ... Signal line for b contact 12c ... Signal line for c contact 13a, 13b ... Attraction unit 14 ... Fixed contact member 15a, 15b ... Fixed contact 18 ... Coil 22 ... Movable contact piece 23a, 23b ... Movable contact 25 ... Permanent Magnet 26 fulcrum 27 extended part 28 pressing piece

Claims (7)

[Claims] 1. An iron core having a suction part at least at one end, an insertion hole that penetrates the suction part of the iron core and is exposed upward, and a winding state provided around the insertion hole. A coil plate having a coil, and a movable contact provided at the end is opened and closed by a fixed contact disposed opposite to the coil contact, the movable contact provided at the end being sucked by at least one suction portion of the iron core, the movable contact being provided above the coil plate. A microrelay, comprising a movable plate mounted thereon and closed by a cover provided with a permanent magnet for swingably supporting the movable plate. 2. The permanent magnet according to claim 1, wherein the permanent magnet includes a fulcrum for swingably supporting the movable plate and an extending portion extending so as not to interfere with the movable plate. Micro relay. 3. The microrelay according to claim 1, wherein a through hole is formed in the suction portion of the iron core, and a fixed contact member having a fixed contact is provided in the through hole. 4. The base has a box shape opening upward,
The movable plate is constituted by a movable piece which is sucked and oscillated by a suction part of the iron core and a contact piece which is integrated with the movable piece and has a movable contact on an upper surface of an end portion, and wherein the cover has a plate shape. The micro relay according to claim 1 or 2, wherein a fixed contact with which the movable contact comes and goes is formed on a lower surface thereof. 5. The base is formed in a plate shape, and a support base and a fixed contact base having a fixed contact are formed on an upper surface thereof. The movable plate is supported by the support base and sucked by a suction part of the iron core. 3. A movable piece which swings by moving the movable piece, and a contact piece which is integrated with the movable piece and has a movable contact on the upper surface of an end which comes into contact with and separates from the fixed contact. Micro relay according to the above. 6. A movable contact piece which is swingably supported at a center portion on both sides and at least one end of which is sucked by a suction portion of the iron core, a movable contact piece extending outward, and a base and a cover are provided. The microrelay according to any one of claims 1 to 5, wherein the microrelay is configured to include a clamping receiving portion that is clamped by: 7. The movable plate according to claim 1, wherein a part of said movable plate is provided with a biasing means for abutting against one of the components and biasing it to a specific swing position. 2. The micro relay according to item 1.