JPS6346531B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reed relay, particularly a polarized reed relay.

In order to obtain a polarized reed relay that performs monostable operation, the magnetic attraction forces acting on the reeds from a pair of fixed contacts are unbalanced. If the top cover is made of magnetic metal for magnetic shielding, etc., a magnetic path will also be formed in the top cover, so it may not be possible to obtain a sufficient imbalance in the magnetic attraction force. may occur.

The present invention has been made in view of these points, and its purpose is to provide a reed relay that can reliably obtain the unbalance of magnetic attractive force required for monostable operation.

Therefore, in the present invention, a lead is arranged in the center body of a coil frame in which a group of terminals such as a coil terminal and a ground terminal are implanted, the coil is wound around the center body, and the lead is inserted into a flange at one end of the coil frame. One end of the lead is fixed to the terminal plate, and a pair of fixed contacts consisting of a pair of magnetic pole plates and a conductive magnetic plate magnetically connected to each magnetic pole plate are arranged inside the flange portion at the other end of the coil frame. A relay body is constructed by positioning the free end of the lead between both stationary contacts facing each other with a space between them, and has an insertion hole for each terminal on the bottom surface, and a pair of protrusions for positioning the coil frame on the top surface. The relay body is housed between the synthetic resin lower cover and the magnetic metal upper cover that is fitted onto the lower cover, and the relay body is positioned between both protrusions of the lower cover, and one A magnetic pole plate and a fixed contact are arranged on the upper cover, and the other magnetic pole plate and fixed contact are arranged close to the lower cover, and the coil frame is housed in the flange at one end of the coil frame, and both fixed contacts are made to have different polarities through the magnetic pole plate. The gist is that a magnetizing permanent magnet is placed closer to the magnetic pole plate located on the lower cover side than the magnetic pole plate on the upper cover side, and the fixed end of the lead is placed close to the inner surface of the side wall of the upper cover. The feature is that the imbalance in magnetic attraction force is increased by utilizing the difference in magnetic permeability between the upper cover made of body metal and the lower cover made of synthetic resin.

The present invention will be explained below based on illustrated embodiments. 1 to 5, the coil frame 1 has flange portions 12 and 13 at both ends of a hollow central body portion 11.
A terminal group consisting of four coil terminals 23, a ground terminal 21, and a common terminal 26 integrated with the terminal plate 10 to which one end of the lead 4 is fixed is insert molded. It was planted by. When forming the coil frame 1, a conductive metal plate 40 is punched and formed into parts that will become each terminal group as shown in FIG.
is sandwiched between upper and lower molds, a side core is placed in the discontinuous portion B in the figure, and a cavity surrounded by the upper and lower molds and side cores is filled with synthetic resin and molded. The one-dot chain line in FIG. 6 indicates the outer line of the coil frame molding. The space for lead arrangement in the center body 11 and the spacing piece 15 described below, etc. are as follows:
Shaped by side cores. After this molding,
The coil frame 1 is obtained by cutting it from the metal plate 40 along the broken line in the figure and bending each terminal group downward. In addition, two of the four coil terminals 23 are
This is for winding, and in the case of one roll, break it off at the part indicated by the broken line in Figure 1. Each coil terminal 23 has a continuous coil winding piece 24, and the central body 1
When winding a coil around the outer circumference, bend the coil winding piece upward by 90 degrees. Earth terminal 2
The protruding piece 22 continuous to 1 is bent laterally.

Common terminal 26 at one end of coil frame 1 and terminal plate 10
The flange portion 12 into which is inserted opens upward and downward to expose the terminal plate 10 within the flange portion 12, and one end of the lead 4 inserted into the central body portion 11 is welded to this terminal plate 10. In the flange portion 13 at the other end of the coil frame 1, fixed contacts 7, 7 made of a pair of conductive magnetic plates and a permanent magnet 9 are arranged. Of the fixed contact terminals 8 and the magnetic pole plates 6 which are integrally formed by the above method, they are fixed in advance to the magnetic pole plates 6 by spot welding or laser welding to form fixed contact blocks A and A, respectively. The fixed contact 7, the magnetic pole plate 6, and the fixed contact terminal 8 may be integrally formed instead of being connected by welding as in this embodiment.

Central body portion 1 opening in flange portion 13
As mentioned above, spacing pieces 15, 15 are formed by side cores on both sides of the opening edge of the hollow part 1, respectively. The movable range of the lead 4 is determined by press-fitting the pair of fixed contact blocks A, A into the flange part 13 while fitting the side edges into the notches 14, 14 on both upper and lower sides of the flange part 13, respectively. , the protrusion 25 provided on the magnetic pole plate 6 comes into pressure contact with the inner surface of the flange portion 13, and both sides of the opposing surfaces of both fixed contacts 7, 7 abut on both the upper and lower surfaces of the spacing pieces 15, 15, respectively, and the side core The distance between the fixed contacts 7, 7 is determined by the thickness of the spacer piece 15 formed by the above. For this reason, a constant contact spacing can always be obtained, and the other end of the lead 4, whose free end is positioned between both fixed contacts 7, 7, is attached to the terminal plate 10 inserted along the parting line of the upper and lower molds. Since the fixed contacts 7, 7 and the lead 4 are fixed to each other, inclinations between the fixed contacts 7, 7 and the lead 4 are less likely to occur, compared to a case where each flange portion 12, 13 is formed by each side core. This means that operation with stable characteristics can be obtained.

Now, a permanent magnet 9 is disposed between each magnetic pole plate 6, 6 of both fixed contact blocks A, A disposed within the flange portion 13 by means of adhesive or the like. In addition, the permanent magnet 9 here is connected to the lower fixed contact block A.
It is attached to the upper surface of the magnetic pole plate 6 at. still,
Contact plating is applied to the forked free end of the lead 4 and the contact portion or the entire surface of the fixed contact 7.

The relay main body formed as described above is covered and sealed by the upper cover 2 and the lower cover 3. The upper cover 2 is made of magnetic metal,
It is box-shaped with an opening at the bottom. The lower cover 3 is a synthetic resin molded product and has a thin box shape with an upward opening, and the bottom has a terminal insertion hole 33, an upwardly protruding protrusion 34 and a protruding portion 31 that are press-fitted into the coil frame 1. have. A through hole 32 is formed in the protrusion 31 and extends vertically. This lower cover 3 is larger than the upper cover 2, and the upper cover 2 is designed to fit into the peripheral wall of the lower cover 3. When assembling, first pass each terminal through the insertion hole 33, and then insert the lower cover 3 into the lower cover 3. and coil frame 1 are combined.
Thereafter, a sealant 35 is injected into the lower cover 3 and the lower edge of the upper cover 2 is fitted. The injected sealant 35 not only adhesively seals the inner surface of the peripheral wall of the lower cover 3 and the outer surface of the lower peripheral edge of the upper cover 2, which are the contact surfaces of the upper and lower covers 2 and 3, but also seals the through hole 33. The relay body is fixed to the lower cover 3 by sealing the gaps between the terminals passed through. Therefore, the lower cover 3, the upper cover 2, and the relay body can be fixed and sealed at the same time.

In addition, the increase in pressure inside the relay due to heat generated as the sealant 35 hardens is eliminated because the inside of the relay communicates with the outside through the through hole 32 left in the lower cover 3. Pinholes are prevented from forming on the bonding surface. Additionally, since organic gas inside the relay can also be removed, the reliability of the contacts is increased. Note that the through hole 32 is sealed in the final step, and at this time, the through hole 32 can be used to fill in an inert gas.

The hermetically sealed relay is
The upper cover 2 acts as a magnetic shielding case, and when the upper cover 2 is assembled to the lower cover 3, the protrusion 22 continuous with the ground terminal 21 comes into contact with the inner surface of the upper cover 2. ,
It is grounded through the ground terminal 21. This grounding makes it possible to reduce the capacitance between the contacts. The conductors on the surface of the printed circuit board to which the upper cover 2 and each terminal are connected are insulated because the upper cover 2 is fitted into the lower cover 3 and the synthetic resin lower cover 3 exists between them. The distance is getting longer. In order to provide magnetic shielding also below, a magnetic shielding plate 36 may be interposed as shown in FIGS. 7 and 8. The notch at the periphery of the magnetic shield plate 36 is provided for insulation from each terminal. The upper cover 2 and the magnetic shield plate 36 reliably shield the entire surface of the relay from external magnetic fields and prevent them from being influenced by them.

In the case shown in FIGS. 9 to 11, the sealing agent 35 is used to achieve better sealing, and the small protrusion 38 protruding from the upper surface of the lower cover 3 surrounds the insertion hole 33. The sealing agent 35 is arranged in a manner such that the insertion hole 33 is reliably filled with the sealing agent 35, and a knurled groove 39 provided on the outer surface of the lower peripheral edge of the upper cover 2 and a lower portion as shown in FIG. Groove 39 formed on the inner surface of the peripheral wall of the cover 3
The sealant 35 is more easily filled in the joint surface between the lower cover 3 and the upper cover 2 to improve airtightness. The groove 39 may have a small uneven shape.

FIG. 12 shows a device in which the open circuit voltage can be adjusted after assembly by using the through hole 32. That is, the through hole 32 is connected to the lead 4.
The adjustment screw 3 is placed directly under the terminal board 10 to which one end is fixed, and the through hole 32 is provided with a female thread, and the adjustment screw 37 is screwed into the through hole 32.
7 is brought into contact with the lower surface of the terminal plate 10. By changing the pressing force against the terminal plate 10 by screwing the adjusting screw 37 forward and backward, the position of the fixed end of the lead 4 can be finely adjusted.As a result, the adjustment of the open-circuit voltage can be completed. You can do it later. Therefore, even when stress is applied to the coil frame 1 due to the injection and hardening of the sealant 35 and the operating characteristics change, the parts assembly and the hardening of the sealant 35 are completed, and the lower cover 3, upper cover 2, and coil By performing the adjustment using the adjustment screw 37 after the rigidity of the three parts of the frame 1 is obtained, it is possible to avoid characteristic fluctuations, and it is possible to improve the yield and obtain characteristics with small variations. When the adjustment is completed, the adjustment screw 37 is fixed to the lower cover 3 with adhesive, and the adjustment screw 37 is locked and sealed to ensure airtightness.

In this reed relay, normally, the reed 4 is in contact with the lower fixed contact 7 due to the attractive force of the permanent magnet 9 against the spring force.
In this state, if the coil 5 is energized and the lead 4 is magnetized to the same polarity as the fixed contact 7 below, the lead 4
is the upper fixed contact 7 away from the lower fixed contact 7.
When the coil 5 is de-energized, the lead 4 also returns to its original state.
FIG. 13 shows an operating characteristic diagram.

Here, the upper cover 2 surrounding the relay body is made of magnetic metal as described above, and the lower cover 3 is made of synthetic resin, and one of the fixed contacts 7 and the magnetic pole plate 6 are located close to the upper cover 2. , the other fixed contact 7 and the magnetic pole plate 6 are arranged close to the lower cover 3, and the permanent magnet 9 is attached to the magnetic pole plate 6 close to the lower cover 3, and the other permanent magnet 9 is attached to the magnetic pole plate 6 close to the upper cover 2. As shown in FIG. 14, the magnetic resistance R ₁ between the upper magnetic pole plate 6 and the upper cover 2 leading to the lead 4 and the lower magnetic pole plate 6 and the lower cover are separated from each other. 3 and the magnetic resistance R ₂ from the top cover 2 to the lead 4.
The magnetic resistance R ₂ is much larger.
Therefore, the magnetic flux φ 1 that is the magnetic attraction force F ₁ acting on the lead 4 from the upper fixed contact 7, that is, the normally open side fixed contact 7, is the magnetic flux φ ₁ acting on the lead 4 from the lower normally closed side fixed contact 7. With respect to the magnetic flux φ ₃ which becomes the attractive force F ₂ , the relationship is approximately φ ₁ = φ ₃ −φ ₂ −φ ₄ , but at this time, the magnetic resistance R ₁ is small and the magnetic flux φ ₄ becomes considerably large. The magnetic flux φ ₁ is reduced by the amount that the magnetic flux φ ₁ and φ ₃
This difference is even greater than that due to the presence of the permanent magnet 9 on one side of the fixed contact 7, making it easier to obtain the unbalanced magnetic attraction force required for monostable operation.

In the embodiment in which the magnetic shield plate 36 is provided, the unbalance of the magnetic attraction force is smaller than that without the magnetic shield plate 36, but the unbalance required for monostable operation can still be obtained sufficiently.

As described above, in the present invention, there is a gap between the lower cover which has insertion holes for each terminal on the bottom surface and a pair of protrusions for positioning the coil frame on the upper surface, and the upper cover that is fitted into the lower cover. Since the relay body is placed between both protruding parts of the lower cover, the relay body is reliably positioned on the lower cover, and one fixed contact and this A magnetic pole plate that is magnetically connected to the coil frame is placed close to the magnetic metal upper cover, and the other fixed contact and the magnetic pole plate that is magnetically connected to this are placed close to the synthetic resin lower cover. A permanent magnet, which is housed in the flange of the lead and magnetizes both fixed contacts to different polarities, is placed closer to the magnetic pole plate located on the lower cover side than the magnetic pole plate located on the upper cover side, and the fixed end of the lead is Since it is placed close to the inner surface of the side wall of the upper cover, the magnetic flux flowing through the normally open side fixed contact on the upper cover side and the lead through the upper cover causes the permanent magnet to be connected to the normally closed side fixed contact on the lower cover side and the magnetic flux flowing through the lead. The unbalance of the magnetic attraction force due to the proximity to the magnetic pole plate is further increased, and monostable operation can be obtained reliably and easily.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of one embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the same, and FIG. 3 is a broken longitudinal plan view of the same.
Figure 4 is a cross-sectional view taken along the line X--X in Figure 3, Figure 5 is a cross-sectional view taken along the Y-Y line in Figure 3, and Figure 6 is a cross-sectional view of the conductive metal plate inserted during molding of the above coil frame. A perspective view, FIGS. 7 and 8 are an exploded perspective view and a vertical sectional view of another embodiment, FIG. 9 is an exploded perspective view of still another embodiment, FIG. The figure is a broken plan view, FIG. 12 is a vertical sectional view of another embodiment, FIG. 13 is an operating characteristic diagram according to the present invention, and FIG.
FIG. 4 is a magnetic circuit diagram for explaining the present invention,
1 is the coil frame, 2 is the top cover, 3 is the bottom cover, 4
is a lead, 5 is a coil, 7 is a fixed contact, 9 is a permanent magnet, 10 is a terminal plate, 11 is a center body, 12, 1
3 is a flange portion, 21 is a ground terminal, 22 is a protruding piece, 23 is a coil terminal, 31 is a protrusion, 32 is a through hole, 33 is an insertion hole, 34 is a protrusion, 36 is a magnetic shield plate, 37 is an adjustment screw, 38 is a small protrusion, 39
indicates a groove.

Claims (1)

[Claims] 1. A lead is arranged in the central body of a coil frame in which a group of terminals such as a coil terminal and a ground terminal are implanted, and a coil is wound around the central body, and the lead is placed in a flange at one end of the coil frame. One end of the lead is fixed to the inserted terminal plate, and a pair of fixed contacts consisting of a pair of magnetic pole plates and a conductive magnetic plate magnetically connected to each magnetic pole plate are placed inside the flange at the other end of the coil frame. The relay body is constructed by positioning the free end of the lead between both stationary contacts facing each other at a distance, and has an insertion hole for each terminal on the bottom surface, and a pair of protrusions for positioning the coil frame on the top surface. The relay body is placed between the lower cover made of synthetic resin and the upper cover made of magnetic metal fitted to the lower cover, and the relay body is positioned between both protrusions of the lower cover, and one The magnetic pole plate and the fixed contact are placed on the upper cover, and the other magnetic pole plate and the fixed contact are placed close to the lower cover, and the two fixed contacts are placed in the flange at one end of the coil frame, and the two fixed contacts are connected to different polarities through the magnetic pole plate. A permanent magnet that is magnetized is arranged closer to the magnetic pole plate located on the lower cover side than the magnetic pole plate on the upper cover side, and the fixed end of the lead is located close to the inner surface of the side wall of the upper cover. lead relay. 2. The reed relay according to claim 1, wherein the ground terminal implanted in the coil frame is integrally provided with a protrusion that contacts the upper cover. 3. The reed relay according to claim 1, wherein the protruding portion of the lower cover is provided with a through hole.