JPH0515704Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] The present invention relates to electromagnetic relays that control various electronic devices, especially those that are smaller and more sensitive. A substantially C-shaped yoke is formed by overlapping the long legs of a pair of U-shaped auxiliary yokes, each having a long leg and a short leg with different lengths, for the purpose of achieving high dielectric strength between the contacts. a yoke, a winding wound around a bobbin through which the yoke passes through the center, one magnetic pole surface is in contact with the tip of the long short leg of the yoke, and the other magnetic pole surface is a cylindrical surface. an armature having armature surfaces facing both short legs of the yoke at both ends, the central portion of which is swingably supported by the cylindrical surface of the permanent magnet; A movable contact spring is fixed to the armature and has movable contacts at both ends of the surface opposite to the armature, and a fixed contact spring has a fixed contact facing the movable contact.

[Industrial application field]

The present invention relates to an electromagnetic relay that controls various electronic devices, and more particularly to an electromagnetic relay that achieves high sensitivity by increasing the efficiency of a bistable magnetic circuit that drives a movable contact spring. For example, small electromagnetic relays are used to control motors in electronic cameras, but even though conventional electromagnetic relays are called ultra-compact relays, they have a smaller external size than semiconductor integrated circuits and other electronic components. The mounting space for the control circuit made up of these parts is set based on the mounting space for the electromagnetic relay. However, camera bodies and the like are also required to be smaller and lighter, and as a result, constraints on the mounting space for control circuits are becoming increasingly strict. Therefore, there is a strong demand for miniaturization of electromagnetic relays, which serves as a standard for setting the mounting space.

[Conventional technology]

Figure 3 is a principle diagram showing a conventional electromagnetic relay, Figure 4
The figure is a perspective view of a conventional electromagnetic relay.

In the figure, 5 is a bistable magnetic circuit, which has a pair of U-shaped auxiliary yokes 21 and 22 having long legs and short legs.
A yoke 2 formed by overlapping the respective long leg portions 23 and 24 of
and respective short leg portions 25 and 26 with one end facing each other.
The armature 4 is fitted between the armature 4 and the armature 4, the other end of which is opposed to the short leg portion 26 via a permanent magnet 17.

A movable contact spring 61 having one end locked by a hinge mechanism 62 and having a movable contact 61a at the other movable end is spot welded 6 to the armature 4.
1b, etc., and on both sides of the movable end of the movable contact spring 61, there are two fixed contact springs 63, 64 having fixed contacts facing the movable contact 61a.
is planted on a base (not shown).

In the initial state of the bistable magnetic circuit 5, it is assumed that, for example, one end of the armature 4 is attracted to the short leg portion 25 by the action of the permanent magnet 17 and is stable. The movable contact 61a on the movable contact 61 is in contact with the fixed contact on the fixed contact spring 63 opposite thereto. (Figure 3 shows this state.) When a driving voltage is applied to the winding 32 to reverse the magnetic pole of the yoke 2, the short leg 25 attracting the armature 4 is repelled by the force of the permanent magnet 17. A magnetic pole is generated, and the armature 4 rotates in the direction of arrow A using the permanent magnet 17 as a fulcrum and is attracted to the short leg portion 26. Therefore, the movable contact 61a of the movable contact spring 61 fixed to the armature 4 contacts the fixed contact on the fixed contact spring 64 provided at a position facing it, and the drive voltage applied to the winding 32 is cut off. It remains stable in that state.

Next, when a driving voltage in the opposite direction to the above is applied to the winding 32, the armature 4 is attracted toward the short leg portion 25 due to the opposite effect, and remains stable in that state even after the driving voltage is cut off.

By winding the wire around a fixed yoke and placing the armature and permanent magnets on the sides of the winding, it is significantly more compact than previous electromagnetic relays, which had wires wound around movable parts such as the armature. is achieved.

[Problem that the invention attempts to solve]

By the way, in order to increase the drive efficiency in this type of electromagnetic relay, it is desirable that the main magnetic flux due to the drive voltage applied to the winding 32 passes through the armature 4 without leaking elsewhere. In the circuit, the air gap between the opposing short legs 25 and 26 is bypassed without passing through the armature, making it impossible to increase drive efficiency (high sensitivity). If an attempt is made to increase efficiency by reducing the permeance of the bypass path by reducing the opposing area of the air gap, a problem arises in that the magnetic attraction force decreases and desired contact operation cannot be ensured.

In addition, in the above-mentioned conventional electromagnetic relay, the contact part consisting of the tip of the movable contact spring and the two fixed contact springs is arranged in a narrow space inside the magnetic circuit, so there is sufficient space between the movable contact and the fixed contact. Another problem was that it was difficult to ensure a suitable contact gap, and it was difficult to obtain an electromagnetic relay with high dielectric strength between the contacts.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of an electromagnetic relay according to the present invention.

The above conventional problem is solved by overlapping the long legs 23, 24 of the pair of U-shaped auxiliary yokes 21, 22, each having long legs 23, 24 and short legs 25, 26 having different lengths. A substantially C-shaped yoke 2 formed by
and a bobbin 31 with the yoke 2 passing through its center.
a permanent magnet 17 having one magnetic pole surface in contact with the outer surface of the tip of the longer short leg portion 26 of the yoke 2 and the other magnetic pole surface forming a cylindrical surface; Both short legs 25, 2 of the yoke 2 are attached to the surface.
armature surfaces 41, 4 facing the outer surfaces of 6, respectively;
2, the center part of which is swingably supported in a seesaw manner by the cylindrical surface of the permanent magnet 17, the center part of which is fixed to the armature 4, and both ends of the surface opposite to the armature 4; movable contact 61
A movable contact spring 61 having contact points a and 61b, and a fixed contact spring 6 having fixed contacts 63a and 64a facing the movable contacts 61a and 61b, respectively.
This problem is solved by the electromagnetic relay of the present invention, which is characterized by comprising the following.

[Effect]

With the above configuration, the bypass path for the main magnetic flux by the winding becomes an air gap portion corresponding to the notch of the C-shaped yoke, but the opposing area is the area between both short legs and the armature's armature surface. Since it can be made sufficiently small regardless of the facing area, the main magnetic flux due to the drive voltage passes through the armature through the armature facing surface of the short leg of the yoke without bypassing the air gap part, forming a magnetic circuit with high drive efficiency. be done.

Further, since the contact group is arranged outside the magnetic circuit, there is sufficient space, and it is easy to secure a desired contact gap.

〔Example〕

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

FIG. 1 is a principle diagram of an electromagnetic relay according to the present invention, and FIG. 2 is a perspective view of an embodiment of the electromagnetic relay according to the present invention.

In the figure, 5 is a bistable magnetic circuit, and yoke 2
, a winding 32 wound around a bobbin 31 through which the yoke 2 passes, a permanent magnet 17, and an armature 4.

The yoke 2 includes a U-shaped auxiliary yoke 21 having a long leg portion 24 and a short leg portion 26, and another U-shaped auxiliary yoke 22 having a long leg portion 23 and a short leg portion 25 shorter than that of the auxiliary yoke 21. This is a substantially C-shaped magnetic circuit formed by overlapping the respective long leg portions 23 and 24 of the above.

The permanent magnet 17 has one magnetic pole face connected to the yoke 2.
It has a simple semi-cylindrical shape in which the other magnetic pole surface is in contact with the tip of the longer short leg portion 26 and is formed into a cylindrical surface.

The armature 4 is swingably supported at its center by the cylindrical magnetic pole surface of the permanent magnet, and is formed by armature surfaces 41 and 42 at both ends and both short legs 25 and 26 of the yoke. A magnetic circuit for main magnetic flux is constituted by winding 32 via an air gap.

A movable contact spring 61 has a central portion 61b fixed to the outside of the armature 4 by spot welding or the like, and movable contacts 61a and 61b are provided at both ends. On the side of the movable contact spring 61, fixed contacts 64a, 6 opposite to the movable contacts 61a, 61b are provided.
Fixed contact springs 64, 63 each having a diameter of 3a are provided. Since the contact group is arranged outside the magnetic circuit in this way, there is no space restriction and a desired contact cap can be secured.

In the initial state of the bistable magnetic circuit 5, for example, the armature 4's polarized surface 41 is connected to the permanent magnet 1.
Assuming that the movable contact 61a on the movable contact spring 61 fixed to the armature 4 is stabilized by being attracted to the short leg portion 25 by the action of 7, the movable contact 61a on the movable contact spring 61 fixed to the armature 4 is connected to the fixed contact 63 on the fixed contact spring 63 facing it.
It is in contact with b. (FIG. 1 shows this state.) Here, when a driving voltage is applied to the winding 32 to reverse the magnetic pole of the yoke 2, the short leg portion 25 attracting the armature 4 is repelled by the force of the permanent magnet 17. A magnetic pole is generated, and the armature 4 swings in the direction of arrow A using the permanent magnet 17 as a fulcrum, and the armature 4 swings in the direction of arrow A on the opposite side.
2 is attracted to the short leg portion 26. Therefore, the movable contact 61a of the movable contact spring 61 fixed to the armature 4 is opened, and the movable contact 61b at the other end contacts the opposing fixed contact 64a, so that even if the driving voltage is cut off, the attraction force of the permanent magnet It stabilizes in that state.

Next, when a driving voltage in the opposite direction to the above is applied to the winding 32, the armature 4's armature surface 41 is attracted toward the short leg portion 25 side due to the opposite effect, and it remains the same even after the driving voltage is cut off (the state shown in Fig. 1). stable in the state.

By winding the wire around a fixed yoke and placing the armature and permanent magnets on the sides of the winding, it is significantly more compact than previous electromagnetic relays, which had wires wound around movable parts such as the armature. is achieved. Furthermore, since the permeance of the air gap formed by the end faces of both short legs 25 and 26 is small, the main magnetic flux caused by the drive voltage passes through the armature without bypassing, so that the magnetic circuit is efficient and high sensitivity can be achieved.

[Effect of idea]

As described above, according to the present invention, it is possible to provide a compact electromagnetic relay that has high sensitivity due to an efficient magnetic circuit and high dielectric strength due to a wide contact gap, and its practical effects are remarkable. .

[Brief explanation of the drawing]

FIG. 1 is a principle diagram of the electromagnetic relay according to the present invention,
FIG. 2 is a perspective view of an embodiment of an electromagnetic relay according to the present invention, FIG. 3 is a principle diagram showing a conventional electromagnetic relay, and FIG. 4 is a perspective view of a conventional electromagnetic relay. In the figure, 2... Yoke, 4... Armature, 5... Bistable magnetic circuit, 17... Permanent magnet,
21, 22... Auxiliary yoke, 23, 24... Long leg section, 25, 26... Short leg section, 31... Bobbin, 3
2...Winding, 41, 42...Archive surface, 61...Movable contact spring, 61a, 61b...Movable contact, 6
3, 64...Fixed contact spring, 63a, 64a...
It is a fixed contact.

Claims (1)

[Claims for Utility Model Registration] A pair of U-shaped auxiliary yokes 21 and 22 each having long legs 23 and 24 and short legs 25 and 26 having different lengths are stacked together. A roughly C-shaped yoke 2 formed by
and a bobbin 31 with the yoke 2 passing through its center.
a permanent magnet 17 having one magnetic pole surface in contact with the outer surface of the tip of the longer short leg portion 26 of the yoke 2 and the other magnetic pole surface forming a cylindrical surface; Both short legs 25, 2 of the yoke 2 are attached to the surface.
armature surfaces 41, 4 facing the outer surfaces of 6, respectively;
2, the center part of which is swingably supported in a seesaw manner by the cylindrical surface of the permanent magnet 17, the center part of which is fixed to the armature 4, and both ends of the surface opposite to the armature 4; movable contact 61
A movable contact spring 61 having contact points a and 61b, and a fixed contact spring 6 having fixed contacts 63a and 64a facing the movable contacts 61a and 61b, respectively.
An electromagnetic relay comprising: 3, 64.