JPH0590783U - Electromagnetic relay - Google Patents

Abstract

(57) [Summary] [Purpose] To fix a plate-shaped yoke member in a stable position with high precision in an ultra-thin electromagnetic relay for printed circuit boards. [Structure] A plate-like yoke member 27 is held between cutout portions 22c and 22d provided in the yokes 22a and 22b, respectively.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an electromagnetic relay suitable as an ultrathin electromagnetic relay for a printed circuit board, for example.

[0002]

[Prior Art]

 For example, a so-called seesaw lance mechanism is known as a microminiature electromagnetic relay used for telephone-related equipment. FIG. 2 is an operation principle diagram of this seesaw balance mechanism. The iron core 1 around which the coil 3 is wound and the yokes 2a and 2b following the iron core 1 are formed in a U-shape. A permanent magnet 4 magnetized to the N-S-N pole is attached between the ends of the irons 2a and 2b. A contact terminal is attached, and an armature 5 is mounted on the permanent magnet 4 so as to rotate around a rotation shaft 6 in the center of the permanent magnet 4 so as to perform a seesaw motion. In such a structure, when no current is flowing in the coil 3, the magnetic flux F1 generated by the permanent magnet 4 flows in the direction indicated by the dotted arrow in FIG. 2, and the N pole of the permanent magnet 4 is connected to the armature. The end 5b of 5 serves as an S pole and maintains the state of being in contact with the yoke 2b. When the magnetic flux F2 due to the coil 3 flows in the direction of the arrow shown by the solid line in FIG. 2, the N pole magnetism of the yoke 2b is weakened and the end 5b repels the yoke 2b, while the yoke 2a is the N pole magnet. Since the property is strengthened, the end portion 5a of the armature 5 is attracted and comes into contact. From the state where the end 5a of the armature 5 and the yoke 2a are in contact with each other, the state shown in FIG. 2 is again returned to the state where the end 5b of the armature 5 and the yoke 2b are in contact with each other. To return, the magnetic flux may be generated in the direction opposite to the direction of the arrow shown by the solid line in FIG. FIG. 3 is a diagram showing an example of a conventional electromagnetic relay using the operation principle of the seesaw lance mechanism described above, and the same components as those in FIG. 2 are designated by the same reference numerals. In the figure, 9 is a movable spring, and 11 is a movable spring supporting member provided in the central portion of the armature 5. The movable spring 9 is supported by a support member 11 and driven by the armature 5, one end of which is, for example, a NO contact terminal 7 provided on the base, and the other end of which is an NC provided on the base. It is electrically connected to the contact terminal 8. 10 is a common terminal to which the central portion of the movable spring 9 is connected.

[0003]

[Problems to be solved by the device]

 In the conventional small electromagnetic relay described above, the central portion of the movable spring 9 is fixed to the working through-terminal 10 by means of welding or the like. When the movable spring is fixed in this way, when the movable spring is driven by the armature, a cutting force is applied to the boundary portion between the fixed portion and the movable portion of the movable spring. Therefore, there is a drawback that the movable spring at this boundary portion has a large mechanical fatigue and the life of the movable spring is short. Also, since the movable spring is fixed at the center, the effective length is about 1/2 of the armature length. However, if the effective length of the movable spring is short, the electrical connection between the contact point of the movable spring and the contact terminals 7, 8 may not be ensured. Moreover, in order to join the central portion of the movable spring 9 and the common terminal 10 by welding or the like, this joint portion needs to have a certain dimension or more. It was. For this reason, conventionally, both wings could not be shortened so much in order to secure the effective length of the movable spring. As described above, conventionally, there are restrictions in the length direction of the movable spring 9, and it has been difficult to reduce the size of the electromagnetic relay accordingly. Further, as is clear from FIGS. 2 and 3, in the conventional electromagnetic relay, the magnetic flux density due to the permanent magnets 4 with respect to the rotating shaft 6 of the armature 5 is symmetrical and becomes a bistable type. There is. In the case of producing a monostable type, for example, the shape of the permanent magnet 4 is left-right asymmetric so that the magnetic flux density is asymmetric. However, in that case, the bistable type and the monostable type have different shapes, which is disadvantageous in terms of manufacturing and cost. Further, when the permanent magnets 4 have the same shape, the magnetization needs to be asymmetrical, and there is a drawback that a complicated magnetizing device is required in manufacturing.

[0004]

[Means for solving problems]

 Therefore, the present invention has an electrical contact forming part having electrical contacts formed at a central portion and both ends thereof, an armature having a rotating shaft in the center, and a seesaw motion about the rotating shaft, and the armature. And a movable spring disposed between the base and the electrical contact forming portion of the base, an iron core around which the coil is wound, and a pair of yokes extending from both ends of the iron core in a direction orthogonal to the iron core. Each is provided with a notch portion, and a U-shaped electromagnet as a whole, a plate-shaped yoke member that is held between the notch portions and bridges the pair of yokes, and the plate-shaped yoke member described above. A plate-shaped permanent magnet disposed on a surface facing the pair of yokes, the armature disposed between the armature and the permanent magnet, and the contact point provided at a position corresponding to the rotation axis position of the armature. A strip that protrudes on one side facing the pole and serves as a fulcrum for the seesaw motion of this armature. And a parallel spring having a pressing piece that applies a pressing force to the armature, and the seesaw motion of the armature is performed by energizing the coil of the electromagnet, and the armature and the movable spring The movable spring is pressed according to the seesaw movement of the armature through an insulating card interposed between the base and the contact point of the movable spring to connect or separate. It is the one that I tried to do.

[Action]

 When the coil of the electromagnet 20 is energized, the seesaw motion of the armature 31 is performed, and the armature 31 is moved through the insulating cards 33a and 33b interposed between the armature 31 and the movable spring 34. The movable spring 34 is pressed in response to the seesaw movement of 31 to connect or separate the contact portion of the base 40 and the contact portion of the movable spring 34.

[0005]

【Example】

 FIG. 1 is an exploded perspective view of a microminiature electromagnetic relay according to an embodiment of the present invention. In the figure, reference numeral 40 denotes a base placed on a printed circuit board or the like, which is provided with a rotary shaft guide groove. Reference numeral 34 is a movable spring, which has a connecting member 36 that serves as its rotation axis. Reference numeral 31 is a plate-shaped armature, and 32 is its rotation axis. 28 is a plate-shaped balance spring, and 20 is an electromagnet. In the figure, 26 is a permanent magnet on a plate magnetized with an N pole on the upper surface and an S pole on the lower surface, and 27 is a yoke member on the plate. In the figure, 20 is an electromagnet. Reference numeral 21 is a winding wound tightly, 23a and 23b are winding frame collars made of resin, 22a and 22b are bent end portions of the above-mentioned iron core, and cutout portions 22c and 22d are formed. It is a yoke provided and has a U shape as a whole. Reference numeral 27 is a plate-shaped yoke member that is arranged so as to bridge the yokes 22a and 22b, and its tip portions 27a and 27b are between the cutout portions 22c and 22d provided in the yokes 22a and 22b. To be held while being in contact with. In the figure, for example, 26 is a plate-shaped permanent magnet whose upper surface is magnetized to N pole and lower surface is magnetized to S pole, and magnetically clings to the yoke member 27. The bistable type or monostable type electromagnetic relay can be set depending on the position where the permanent magnet 26 is fixed. Reference numeral 31 is a plate-shaped armature, and a rotary shaft 32 is formed at the center of the armature 31 in the longitudinal direction. Reference numerals 33a and 33b are insulating cards, that is, insulating protrusions provided on one surface of the active element 31 on the movable spring 34 side. Reference numeral 28 is a plate-shaped balance spring arranged between the permanent magnet 26 and the armature 31. 29a and 29b are side springs provided on both sides of the balance spring 28. Reference numerals 30a and 30b are V-shaped armature pressing pieces formed on the balance spring 28. The armature 31 is arranged so as to bridge the yokes 22 a and 22 b, and the permanent magnet 26 and the balance spring 28 are arranged between the yoke member 27 and the armature 31. Reference numeral 34 is a movable spring arranged between the armature 31 and the electrical contact forming portion 41 of the base 40. The movable spring 34 includes plate-shaped spring members 35a and 35b, and a connecting member 36 that connects the central portions of the plate-shaped spring members 35a and 35b. A central electrical contact 37a is formed in the central portion of the plate-shaped spring member 35a, and terminal electrical contact portions 38a, 38c are formed at both ends. Further, a central electrical contact portion 37b is formed in the central portion of the other plate-shaped member 35b, and end portions 38b, 38d are formed at both ends. The movable spring 34 is pressed by the cards 33a and 33b of the armature 31 and makes a seesaw motion around the central electrical contact portions 37a and 37b. 40 is a base mounted on a printed circuit board or the like. An electrical contact forming portion 41 is provided on the base 40. In the forming portion 41, 42a and 42b are electrical contact portions that come into contact with the central contact portions 37a and 37b of the leaf spring members 35a and 35b, respectively. Further, 43a and 43b are electrical contact portions which come into contact with or separate from the end contact portions 38a and 38b of the spring members 35a and 35b, respectively, with the seesaw movement of the spring members 35a and 35b. 43c and 43d are electrical contact portions that come into contact with or separate from the end contact portions 38c and 38d of the spring members 35a and 35b, respectively, as the spring members 35a and 35b move. Reference numerals 47 to 52 are output pins introduced from the base 40 inserted into holes provided in a printed circuit board or the like. Next, the operation will be described. The permanent magnet 26 in which the yoke member 27 is magnetized to the N pole and the equilibrium spring 28 side is magnetized to the S pole is in contact with, for example, the yoke 22a but not with the yoke 22b. Is fixed at a position deviated from the central position between the yokes 22a and 22b. In this case, since the magnetic flux of the permanent magnet 26 has a large magnetic flux density flowing on the yoke 22b side, the armature 31 is in contact with the yoke 22a and is in a stable state when the buttress magnet 20 is not energized. . When the electromagnet 20 is energized and the magnetic flux flowing on the yoke 22b side is weakened, and conversely the magnetic flux flowing on the yoke 22a side is strengthened, the armature 31 rotates clockwise and moves away from the yoke 22a. , Comes into contact with the yoke 22b. Then, as long as the magnetic flux of the electromagnet 20 is flowing, the armature 31 is kept in contact with the yoke 22b. However, when the current supply to the electromagnet 20 is stopped and the magnetic flux of the electromagnet 20 disappears, the armature 31 is replaced by a clock. It rotates in the direction and returns to the original stable state, that is, the state where the armature 31 and the yoke 22a are in contact with each other.

[0006]

【The invention's effect】

 As described above, according to the present invention, the movable spring is not fixed at the central contact portion of the movable spring, but is rotatable about the central contact portion as a fulcrum. There is an effect that the life of the movable spring is long without a large cutting force being applied to the movable spring. Further, since almost the entire length of the movable spring can be used as an effective portion of the spring, it is possible to use a movable spring which is smaller than the conventional one, and the relay can be downsized. Since both ends of the movable spring are opened and closed by the rotation of the movable spring, a set of switching contacts can be easily realized. The relays can be assembled by stacking them in one direction, so the assembly work is easy and the assembly work can be automated. Since the plate-shaped yoke member is held by the notch provided in the yoke, the yoke member can be fixed at a stable position with high accuracy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment according to the present invention.

FIG. 2 is a diagram illustrating an operation principle of the electromagnetic relay.

FIG. 3 is a perspective view of an electromagnetic relay according to the related art.

[Explanation of symbols]

 20 electromagnet 21 iron core 22a, 22b yoke 26 permanent magnet 27 yoke member 28 balancing spring 31 armature 32 rotary shaft 33a, 33b card 34 movable spring 36 connecting part 37a, 37b central contact part 38a-38d end contact part 40 bases Stand

Claims (1)

[Scope of utility model registration request] 1. An electric contact forming portion having electric contacts formed at a central portion and both ends thereof, an armature having a rotating shaft in the central portion and performing a seesaw motion about the rotating shaft, and the armature. A movable spring arranged between the electric contact forming portion of the base, an iron core around which a coil is wound, and a pair of yokes extending in a direction orthogonal to the iron core from both ends of the iron core. A notch portion is provided, and a U-shaped electromagnet as a whole, a plate-shaped yoke member that bridges the pair of yokes held between the notch portions, and the pair of plate-shaped yoke members. A plate-shaped permanent magnet arranged on the surface facing the yoke,
A strip projection, which is arranged between the armature and the permanent magnet, protrudes to a position corresponding to the rotational axis position of the armature on one side facing the armature, and serves as a fulcrum of the seesaw motion of the armature. And a parallel spring having a pressing piece that applies a pressing force to the armature, and the seesaw motion of the armature is performed by energizing the coil of the electromagnet, and the armature and the movable spring The movable spring is pressed in accordance with the seesaw movement of the armature through an insulating card interposed therebetween so that the contact portion of the base and the contact portion of the movable spring are connected or separated from each other. Made electromagnetic relay