JPS6336096B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a reed relay.

In general, a polarized reed relay consists of a lead with a movable contact, a fixed contact, an excitation coil wound around the lead, and a permanent magnet that excites the movable and fixed contacts. A lead has both electric and magnetic properties, and
The contact gap is characterized by providing electrical insulation between the contacts and forming a gap in the magnetic circuit.

The structure of a conventional reed relay having such a function is shown in FIGS. 1 to 5. In other words, this reed relay has a coil frame,
The lead fixing part provided at one end and the magnet assembly part provided at the other end are each divided into two to form a half-coil frame.
a, 1b, half lead fixing parts 2a, 2b, and half magnet assembly parts 3a, 3b are formed, and these halves are individually molded to form half bodies A, B, and further a coil conductor winding part is formed in each half. 4. Insert mold the coil terminal 5, output terminal 6, common terminal 7, and L-shaped magnetic pole parts 8a and 8b, and join the fixed contacts 9a and 9b to the opposite ends of the L-shaped magnetic pole parts 8a and 8b. The proximal end is fixed to the lead fixing part integrated with the common terminal 7 of the half-lead fixing part 2b, the distal end is passed through the half-coil frame 1b, the magnet 3 is loaded into the half-magnet incorporating part 3b, and then the half-lead fixing part 2b is fixed. The bodies A and B are joined together, the coil 11 is wound around the coil frame, and the iron cover 12 is then wound.
And it is exteriorized with a bottom lid 13. Note 1
4 is a fitting portion between the halves A and B, 15 is a coil relay terminal, and 16 is a relay terminal fixing groove.

However, this reed relay has an L-shaped magnetic pole part 8.
When bonding the fixed contacts 9a, 9b to the fixed contacts 9a, 8b, due to warpage during manufacture of the fixed contacts 9a, 9b, balance difference in bonding pressure, etc. ).
Also, on the opposing surfaces of the halves A and B, a half coil frame 1a,
A slight warp was formed on the joint surface of 1b. As a result, the contact gap accuracy, which is originally determined by the molding accuracy of halves A and B and the fixed contact manufacturing accuracy, is affected by these, resulting in variations in accuracy, variations in magnetic attraction characteristics, and variations in normally closed and normally closed contacts. This results in variations in open contact pressure, increases the difficulty in setting the touching voltage and open voltage, and also reduces contact life and increases contact bounce. Furthermore, fixed contacts 9a, 9b
Since the coil 11 is wound and soldered after installation, solder flux adheres to the contact surfaces of the fixed contacts 9a and 9b, making the contact resistance unstable.

Therefore, examples of proposals that solve these drawbacks, stabilize the contact gap, stabilize electric/magnetic characteristics, and simplify manufacturing are shown in Figures 6 to 11.
As shown in the figure. That is, this reed relay is provided with a spacer 18 (FIG. 6) that determines the contact gap amount at the end of the coil frame 17 through which the lead 10 is inserted, and a fixed contact 19 that is separately configured.
a, 19b are brought into contact with each other and held in that state, and the movable contact of the lead 10 is made to face within that interval. Since the spacer 18 is provided to position the fixed contacts 19a, 19b, if the spacer 18 is constant, the fixed contacts 19a, 19b can be installed without tilting (in the direction of arrow C in Fig. 1), and as in the conventional example. Even if half bodies A and B are joined to make a cylindrical coil frame, half bodies A and B
When the spacer 18 is formed on one side of the spacer 1, the spacer 1
No. 8 is not affected by the warping of the halves A and B, and there is no variation in the gap accuracy of the contacts.

This spacer 18 can be easily manufactured integrally with the coil frame 17 by molding means. At this time, the coil frame 17 is molded all at once with the upper opening 20 formed, without having to be molded separately. This makes it easy to install the leads 10, and the number of parts is reduced compared to the conventional work of joining the halves together. On the other hand, since the lead 10 and the fixed contacts 19a, 19b can be assembled after the coil 11 is wound around the coil frame 17 and soldered, the fixed contacts 19a, 1
It is possible to prevent solder flux from adhering to the contact surface of 9b and stabilize the contact resistance of the contact.

The fixed contacts 19a, 19b are formed integrally with or joined by electric resistance welding or laser welding to contact blocks 21a, 21b formed of flat plates having output terminals 6' as shown in FIG. By installing the fixed contacts 19a and 19b in a predetermined position of the magnet assembly part 22 with adhesive or heat caulking, the fixed contacts 19a and 19b are positioned and held by the spacer 18, thereby simplifying the assembly work of the reed relay. Variations in the resistance characteristics of the magnetic circuit formed by loading the magnets 3 can be prevented.

Due to the adoption of the above configuration, the integrally molded part consists of the coil frame 17, the magnet assembly part 22 which constitutes the fixed contact insertion groove 24, the magnet insertion part 25, and the contact block positioning surface 26, and the insert forming part is , a coil conductor winding portion 4, a coil terminal 5, a common terminal 7, a lead fixing portion 23 integrated with the common terminal 7, a ground terminal 27, and a contact portion 28 with the iron cover 12.

As a result of the above, this reed relay can obtain highly sensitive, high-output magnetic attraction force and stable electrical characteristics.

Although this proposed example is intended for polar reed relays, it is clear from the above that it can also be applied to non-polar reed relays. Further, when there is only one fixed contact and therefore one output terminal, in the above case, one fixed contact simply serves as a stator that determines the contact gap.

However, in this proposed example, contact block 2
Since 1a and 21b are installed in the magnet assembly part 22 with adhesive or heat caulking, it is difficult to calibrate the relay characteristics during assembly, and the fixed contacts cannot be replaced. This is also
The same applies to the case where fixed contacts are fixed by press-fitting.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a reed relay that allows easy calibration of relay characteristics and easy replacement of fixed contacts.

The first embodiment of this invention is shown in FIGS.
It is shown in Figure 7. That is, in this reed relay, a coil frame 17' is formed into a cylindrical shape, a flat lead fixing part 23' having a common terminal 7 is provided at one end by insert molding, and a pair of contact blocks 31a, Side plate 29 for holding 31b
extend integrally in the axial direction, and a spacer 30 is protruded from the opposing surface of the side plate 29, so that the fixed contacts 35a, 35b, which are in contact with both sides of the spacer 30, and the tips of the leads 10 face parallel to each other. Both surfaces of the spacer 30 and the lead fixing surface of the lead fixing part 23' are made to be exactly parallel to each other. The contact blocks 31a, 31b are formed by insert molding flat magnetic pole pieces 32a, 32b as shown in FIG. 35b is inserted into the contact guide groove 33 and brought into contact with the magnetic pole pieces 32a, 32b, so that the contact blocks 31a, 31b are supported in a bridging state on the upper and lower edges of the side plate 29, and the magnet 3
are placed in the guide recess 33' so that the fixed contacts 35a and 35b are in contact with the upper and lower surfaces of the spacer 30, and the spring body 36, which is an example of a U-shaped retainer spring made of a non-magnetic material, is attached to the contact block 31a. , 31b. The rest is the same as the proposed example.

In addition to the effects of the proposed example, this embodiment does not require adhesive or other means to fix the contact blocks 31a, 31b to the ends of the coil frame 17'.
For this reason, the contact blocks 31a, 31b are connected to the spring body 3.
6 allows for one-touch attachment and detachment, making it easy to calibrate the relay characteristics during assembly and to replace the fixed contacts. In addition, even if it is repeatedly attached and detached, since it is held by the spring body 36, there is no change in the holding force, and the fixing structure does not become complicated.

A second embodiment of this invention is shown in FIGS.
Shown in Figure 0. In other words, with this reed relay,
A pair of locking arms 37 are provided on both sides of the contact block 31'b.
37' (one is omitted), and when the contact block is attached, both ends of the spring body 38, which is an example of a flat spring, are hung between the locking arms 37 and 37', and the contact block 31'a is attached at the center part. By pressing, the contact blocks 31'a, 31'b are held between the side plates 29 in a sandwiched state. The rest is the same as the proposed example and the first example.

As described above, the reed relay of the present invention has a lead and a lead fixing part at one end through which the lead is inserted and fixes the base end of the lead, and the lead is connected to the lead with the distal end of the lead in between. a coil frame having a pair of side plates at the other end having a spacer facing in a direction perpendicular to the direction of movement of the lead; A pair of contact blocks having fixed contacts facing each other in the same direction with the spacer in between, a permanent magnet located between these contact blocks and imparting a magnetic pole to the fixed contacts, and a permanent magnet provided with the pair of contact blocks. Since it is equipped with a spring body that presses the spring body to sandwich the pair of side plates, it is possible to stabilize and improve contact gap accuracy and electric/magnetic characteristics, simplify manufacturing and reduce costs, and eliminate calibration work for relay characteristics. Furthermore, the fixed contact can be easily replaced with a single touch, and the holding force remains unchanged even after repeated attachment and detachment.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a conventional reed relay, Fig. 2 is a horizontal cross-sectional view thereof, Fig. 3 is a cross-sectional view taken along the line - Fig. 4 is a cross-sectional view taken along the line Fig. 2, and Fig. 5 is a reed relay. 6 is an exploded perspective view of the reed relay in the proposed example, FIG. 7 is a horizontal half sectional view, FIG. 8 is a sectional view along the line 7, and FIG. 9 is a sectional view taken along the line 7. 10 is a longitudinal sectional view of the reed relay, FIG. 11 is a half sectional view taken along the line XI-XI, FIG. 12 is an exploded perspective view of the reed relay in the first embodiment of the present invention, and FIG. 13 is a longitudinal sectional view of the reed relay. 14 is a sectional view along the line, FIG. 15 is a sectional view along the line 13, FIG. 16 is a longitudinal sectional view of the reed relay, and FIG. 17 is a half sectional view along the line 15. , FIG. 18 is a half plan view of the reed relay in the second embodiment, and FIG. 19 is a half plan view of the reed relay in the second embodiment.
The figure is a half-longitudinal sectional view, and FIG. 20 is a half-longitudinal front view. 10...Lead, 17'...Coil frame, 23'...
...Lead fixing part, 29...Side plate, 30...Spacer, 31a, 31b, 31'a, 31'b...Contact block, 35a, 35b...Fixed contact, 36,
38... Spring body.

Claims (1)

[Scope of Claims] 1. A lead, having a lead fixing part at one end through which the lead is inserted and fixing the proximal end of the lead, and at right angles to the operating direction of the lead, with the distal end of the lead in between. a coil frame having a pair of side plates at the other end having spacers facing each other in the same direction; a pair of contact blocks having fixed contacts facing each other with a child in between; a permanent magnet positioned between these contact blocks to provide magnetic poles to the fixed contacts;
and a spring body that biases the pair of contact blocks to sandwich the pair of side plates. 2. The spring body is a U-shaped leaf spring, and the spring body is engaged between the pair of contact blocks.
Reed relay as described in section. 3. One of the contact blocks has a pair of arms extending to the upper side of the other, and the spring body is a flat plate spring whose both ends engage with the tips of the arms, and whose central part presses the other contact block. A reed relay according to claim 1.