JPH10255635A - Electromagnetic microrelay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic microrelay with high productivity and little operating characteristic dispersion. SOLUTION: A pair of electromagnetic parts 37, 38 having coils 34, 35, 36 arranged around iron cores 20, 25 having fixed contacts on the upper end parts are juxtaposed. On the other hand, a movable contact sheet 40 having hinge parts 43, 43 extended from both opposed side edges of a movable contact piece 44 consisting of a sheet conductive magnetic material on the same straight line are formed. The hinge parts 43, 43 are supported, whereby the movable contact piece 44 is opposed to the iron cores 20, 25 so as to alternately make contact with and separate from the fixed contacts of the iron cores 20, 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnet microrelay, and more particularly, to a driving mechanism thereof.

[0002]

2. Description of the Related Art Conventionally, as an electromagnet micro relay,
For example, there is one described in JP-A-1-292725. That is, a substrate having two fitting holes and having at least two printed coil portions formed by printing in a substantially spiral shape around the fitting holes, and a substantially U-shaped cross section. An iron core having both ends fitted into the fitting holes and protruding, and one end fixed to one end of the iron core protruding, and an intermediate portion protruding from the iron core. A movable contact piece arranged at the other end so as to be able to contact and separate from the other end, and a movable contact provided at the free end is opposed to a fixed contact provided on the substrate so as to be able to contact and separate from the fixed contact. is there.

[0003]

However, in the above-described relay, the iron core and the movable contact piece must be assembled to the substrate from different directions, and it takes time and effort to perform positioning and assembling operations, and the assembling accuracy tends to vary. . For this reason, there is a problem that productivity is low and the operating characteristics tend to vary.

[0004] In view of the above problems, an object of the present invention is to provide an electromagnet microrelay that has high productivity and does not vary in operation characteristics.

[0005]

In order to achieve the above object, an electromagnet microrelay according to the present invention comprises: a pair of electromagnet portions arranged side by side with a coil disposed around an iron core having a fixed contact at an upper end. The hinge portion extends on the same straight line from substantially the center of the opposing side edges of the movable contact piece made of a thin plate-shaped conductive magnetic material, and supports the hinge portion to fix the movable contact piece to the electromagnet portion. A movable contact sheet which is opposed to a contact so as to be able to contact and separate therefrom, and by alternately applying a voltage to the coil of the electromagnet section, the movable contact piece rotates around the hinge portion as a fulcrum, and the movable contact piece Is configured to alternately contact and separate from the fixed contact to open and close the contact.

The iron core may have a yoke integrally formed at the lower end thereof.

An upright portion having a height substantially equal to that of the fixed contact of the iron core may be formed on at least one side edge of the yoke.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment according to the present invention will be described with reference to the accompanying drawings of FIGS. The electromagnet microrelay according to the first embodiment is shown in FIGS.
As shown in FIG. 1, generally, a base 10 and a pair of iron cores 20,
25, coil plate 30, movable contact sheet 40
And a cover 50.

The base 10 is, as shown in FIG.
It is a box-shaped resin molded product and has coil terminals 11, 12, 1
3. Common movable contact terminal 14 and fixed contact terminal 1
5 and 16 are formed by insert molding or plating. And the step part 17 and 18 are formed in the opposing inner surface. The connection receiving portion 14a of the common movable contact terminal 14 is exposed at the upper end of the step portion 17, and
The connection receiving portion 15 of the fixed contact terminals 15 and 16 is
a, 16a are exposed. Projections 19a, 19b, and 19c are formed at the base of the step 18, and the connection receiving portions 11a of the common coil terminal 11 and the connection receiving portions 12a and 13a of the coil terminals 12 and 13 are exposed therefrom. I have.

The iron cores 20 and 25 are fixed contacts 20a and 25a by attaching gold, platinum, or the like to the upper ends thereof by welding, brazing, plating, or the like. -Shaped yoke 2 that can be fitted to
1 and 26 respectively. The yokes 21, 26
The upright portions 22, 23 and 27, 28 contact the side surfaces of the step portions 17, 18 respectively at the opposite end edges.
Are formed respectively. When the iron cores 20, 25 are fitted to the base 10, the yokes 21, 26 are positioned at predetermined positions via the steps 17, 18, and the projections 19a, 19b, 19c. Next, the yoke 2
1 and 26 are pressed against the connection receiving portions 15a and 16a, respectively.
Electrical connection is made by welding or brazing.

As shown in FIG. 3, a coil plate 30 is formed on the front and back surfaces of a substrate 31 having fitting holes 32, 33 in a spiral shape around the fitting holes 32, 33. 36 is printed wiring. The coils 34 and 35 formed on the surface of the substrate 31 are:
A through hole 34a,
It is electrically connected via 35a. Further, the coils 34 and 35 have through holes provided at the ends thereof as connection portions 34b and 35b, while the coil 36 has
A connection portion 36a is provided at the end. After the fitting holes 32 and 33 of the coil plate 30 are fitted to the iron cores 20 and 25, respectively, the connection receiving portions 11a and 1
The connecting portions 36a, 3 of the coil plate 30 are connected to 2a, 13a.
4a and 35a are electrically connected to each other by a method such as pressure welding, welding, or brazing, thereby forming a pair of electromagnet portions 37 and 38.
Is formed.

As shown in FIG. 2 (b), the movable contact sheet 40 has a planar shape that can be bridged over the steps 17, 18 of the base 10, and is made of, for example, permalloy, amorphous metal, soft magnetic stainless steel, or the like. It is made of a thin plate-shaped conductive magnetic material. Then, by forming a pair of substantially C-shaped slits 41 and 42 by means of, for example, etching, pressing, or the like, a movable contact piece 44 that is rotatable via a pair of hinge portions 43 and 43 is formed. I have. Further, at each position corresponding to the fixed contacts 20a, 25a of the iron cores 20, 25, a contact material having excellent conductivity, such as gold or platinum, is plated, vapor-deposited, sputtered, pressed, welded, caulked, brazed, etc. By fixing by
The movable contacts 45a and 45b are formed.
(B)). Then, the movable contact sheet 40 is placed over the steps 17 and 18 for positioning, and the common movable contact terminal 14 is
Is electrically connected to the connection receiving portion 14a by a method such as pressure welding, welding, caulking, or brazing (FIG. 2B).

As shown in FIG. 4, the cover 50 has the same plane shape as the base 10, and has a shallow recess 51 formed on the lower surface thereof. And the base 10
Is covered with a cover 50 and hermetically closed,
Assembly work is completed.

The operation of the electromagnet microrelay having the above-described configuration will be described. When no voltage is applied to the coils 34 and 36 constituting the electromagnet section 37, the movable contact piece 44 is in a horizontal state due to the spring force of the hinge sections 43 and 43 (FIGS. 4B and 6A). .

Next, when a voltage is applied to the coils 34 and 36 to excite the electromagnet portion 37, the iron core 20 and the yoke 2
One of the upright portions 22 and 23 sucks one side of the movable contact piece 44 facing these. For this reason, the movable contact piece 44 rotates against the spring force of the hinge part 43, and the movable contact 45 a is attracted to the fixed contact 20 a of the iron core 20, and the terminals 14 and 15 are moved.
The electric circuit between them and the magnetic circuit of the electromagnet unit 37 are closed (FIGS. 5B and 6B).

When the above-mentioned excitation is released, the hinge 4
The movable contact piece 44 returns to the original state by the spring force of 3, and one side of the movable contact piece 44 facing the upright portions 22 and 23 is separated from the fixed contact 20a of the iron core 20.

On the other hand, when a voltage is applied to the coils 35 and 36 to excite the electromagnet section 38, the iron core 25 and the yoke 26
The upright portions 27 and 28 suck the other side of the movable contact piece 44. Therefore, the movable contact piece 44 rotates against the spring force of the hinge portion 43, and the movable contact 45b of the movable contact piece 44 is attracted to the fixed contact 25a of the iron core 25, thereby closing the electric circuit and the magnetic circuit. I do.

When the above-mentioned excitation is released, the hinge 4
The movable contact piece 44 returns to the original state by the spring force of 3, and the other side of the movable contact piece 44 is separated from the fixed contact 25a of the iron core 25.

As shown in FIG. 7, the basic configuration of the second embodiment is almost the same as that of the above-described embodiment. First, the yokes 21 and 26 provided at the lower ends of the iron cores 20 and 25 respectively have upright portions 24 and 29 extending from only one side edge thereof. Also,
The coils 34 and 35 constituting the electromagnets 37 and 38 are separately wound and can be fitted to the iron cores 20 and 25, respectively. Further, as shown in FIG. 7A, the movable contact sheet 40 is formed by punching a pair of substantially U-shaped slits 41 and 42 in a thin plate-shaped conductive magnetic material, and through a pair of hinge portions 43 and 43. Thus, the movable contact piece 44 is rotatable. The other parts are the same as those of the first embodiment, and the description is omitted.

[0020]

As is clear from the above description, according to the electromagnet microrelay according to the present invention, it is only necessary to assemble the movable contact sheet from above into the pair of electromagnets arranged in parallel, so that positioning and assembling work can be performed. No effort is required, and there is no variation in assembly accuracy. For this reason, an electromagnet microrelay with high productivity and no variation in operating characteristics can be obtained. According to the second aspect, since the yoke is integrally formed on the iron core, an electromagnet microrelay having high magnetic efficiency can be obtained without increasing the number of parts and the number of assembling steps.
According to the third aspect, since the upright portion of the yoke is located near the movable contact piece, there is an effect that leakage of magnetic flux is reduced and an electromagnet microrelay with higher magnetic efficiency is obtained.

[Brief description of the drawings]

1A and 1B show a first embodiment of an electromagnet microrelay according to the present invention, wherein FIG. 1A is a plan view of a base alone, and FIG. 1B is a plan view of a base to which an iron core is assembled.

FIG. 2A is a plan view of a base on which an iron core and a coil plate are assembled, and FIG. 2B is a plan view of a base on which an iron core, a coil plate, and a movable contact sheet are assembled.

3A and 3B show a first embodiment, in which FIG. 3A is a plan view showing all coils of a coil plate, and FIG. 3B is a plan view showing only coils wired on the back surface of the coil plate; (c) is a circuit diagram.

FIG. 4A to FIG. 4C are front sectional views of different positions before excitation according to the first embodiment.

FIGS. 5A to 5C are front sectional views showing different positions during excitation according to the first embodiment.

FIG. 6A and FIG. 6B are side sectional views before and during excitation according to the first embodiment.

7A and 7B show a second embodiment according to the present invention, wherein FIG. 7A is a plan view of a movable contact sheet, FIG. 7B is a plan view of an electromagnet part, and FIG. It is a front sectional view showing the state where it fell.

[Explanation of symbols]

10: Base, 20, 25: Iron core, 20a, 25a: Fixed contact, 21, 26: Yoke, 22, 23, 27, 28
... Standing part, 30 ... Coil plate, 34,35,36 ...
Coil, 37, 38: electromagnet part, 40: movable contact sheet, 43: hinge part, 44: movable contact piece, 45a, 45
b: movable contact.

Claims (3)

[Claims] 1. A pair of electromagnet parts arranged side by side with a coil disposed around an iron core having an upper end part as a fixed contact, and substantially opposite side edges of a movable contact piece made of a thin plate-shaped conductive magnetic material. A movable contact sheet which extends the hinge portion from the center on the same straight line, supports the hinge portion, and faces the movable contact piece so as to be able to contact and separate from the fixed contact of the electromagnet portion; An electromagnet, wherein the movable contact piece rotates about the hinge portion by alternately applying a voltage to the coil, and the movable contact piece alternately contacts and separates from the fixed contact to open and close the contact. Micro relay. 2. The electromagnet microrelay according to claim 1, wherein the iron core has a yoke integrally formed at a lower end thereof. 3. The electromagnet microrelay according to claim 2, wherein an upright portion having a height substantially equal to that of the fixed contact of the iron core is formed on at least one side edge of the yoke.