JPS6361739B2 - - 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, 8b, join the fixed contacts 9a, 9b to the opposite ends of the L-shaped magnetic pole parts 8a, 8b, and connect the lead 10. It is fixed to the common terminal 7 of the half-lead fixing part 2b and passed through the half-coil frame 1b, and the magnet 3 is loaded into the half-magnet assembly part 3b.Then, the halves A and B are joined together, and the coil 11 is attached to the coil frame. , and then wrap the iron cover 1
2 and a bottom lid 13. Note that 14 is a fitting portion between 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 the opening contact pressure, increases the difficulty in setting the sensitivity and opening voltage, and also reduces contact life and increases contact bounce. Furthermore, since the coil 11 is wound and soldered after the fixed contacts 9a and 9b are installed, solder flux adheres to the contact surfaces of the fixed contacts 9a and 9b, making the contact resistance unstable.

Therefore, examples of proposals that eliminate 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 Figure 1), and the halves A, B Even when the main body is made by joining the two, since the spacer 18 is not affected in any way, there is no effect of warpage, and variations in the gap accuracy of the contacts are eliminated.

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 leads 19 and the fixed contacts 9a, 19b can be assembled after the coil 11 is wound around the coil frame 17 and soldered, the fixed contacts 19a, 19
It is possible to prevent solder flux from adhering to the contact surface of b, and to stabilize the contact resistance of the contacts.

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 includes the coil frame 17, the lead fixing part 23 (formed as a single piece with an opening at the top), the fixed contact insertion groove 24, the magnet insertion part 25, and the contact block positioning surface 26. The insert molded part is formed by cutting a flat terminal plate after insert molding, and includes the coil conductor winding part 4, the coil terminal 5, and the common terminal 7. , the ground terminal 27 and the 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.

FIG. 12 shows a first embodiment of the invention. That is, in this reed relay, the coil frame 17' is made into a cylindrical shape, a lead fixing part 23' is inserted at one end, and a pair of contact block holding side plates 29 are integrally extended in the axial direction at the other end. A spacer 30 is projected from the opposing surface of the side plate 29 to maintain accurate parallelism between the molded upper spacer 30 and the lead fixing portion 23'. In addition, the contact block 31
a, 31b are flat plates of magnetic polarity 32a, 32b formed by insert molding, and a contact guide groove 33, a magnet guide recess 33', and an output terminal 34 are formed, and the fixed contact 3
5a and 35b are inserted into the contact guide groove 33 and abutted against the magnetic pole pieces 32a and 32b, and the contact block 31
a, 31b are supported in a bridging manner by the upper and lower edges of the side plate 29, and the magnet 3 is fitted into the guide recess 33', and the fixed contacts 35a, 35 are mounted on the upper and lower surfaces of the spacer 30.
Place it so that b is in contact with it. Further, on the side of one (31b) of the contact blocks 31a, 31b, there are two-pronged locking locks 36a, 36 that lock when opened.
b is erected, and the other (31a) is provided with a bifurcated locking arm 36.
Locking parts 37a, 37 that receive the tips of a, 36b
b, and both contact blocks 31a and 31b are arranged on the contact block holding side plate 29, and the locking arm 36
a and 36b are locked.

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'.
Furthermore, since the contact blocks 31a and 31b are removable, it is easy to calibrate the relay characteristics during assembly, and the fixed contacts can be replaced. On the other hand, at the time of locking, the contact blocks 31a and 31b apply pressure to the side plate 29, and the fixed contact surface also applies pressure to the spacer 30, improving positioning accuracy. The rest is the same as the proposed example.

A second embodiment of this invention is shown in FIGS. 13 to 1.
It is shown in Figure 5. In other words, with this reed relay,
In the first embodiment, U-shaped fitting grooves 38, 38' are formed at the ends of the contact blocks 31'a, 31'b, and T-shaped locking fittings 39, 39' are formed on the outer surface of the foot plate 29.
are provided so that they are brought into pressure contact with each other and engaged. The rest is the same as the first embodiment.

As described above, the reed relay of the present invention includes a coil frame in which a pair of side plates are extended in the axial direction from opposing parts of an opening at one end, and a contact gap determining spacer is integrally protruded from the opposing surfaces of the side plates. , a pair of contact blocks supported by a bridge between the upper and lower edges of the pair of side plates, respectively, and having fixed contacts at their tips that abut the upper and lower surfaces of the spacer; The pair of contact blocks is held on the side plate by bending the provided locking arm and locking it to the opposing locking part, which stabilizes and improves contact gap accuracy and electrical/magnetic characteristics. This not only simplifies manufacturing and reduces costs, but also makes it easier to calibrate relay characteristics without increasing the number of parts.Furthermore, fixed contacts can be easily replaced with a single touch, and the fixed state is reliable. There is an effect.

[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. 6 is an exploded perspective view of the reed relay in the proposed example, FIG. 7 is a horizontal half sectional view thereof, FIG. 8 is a sectional view taken along the - line, and FIG. 9 is a sectional view taken along the line 7 of FIG. 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 a partial half sectional plan view of the first embodiment of the present invention, and FIG. FIG. 14 is a side view of the second embodiment, and FIG.
The figure is a half left side view. 17'...Coil frame, 31a, 31b, 31'
a, 31'b... Contact block, 30... Spacer,
35a, 35b...Fixed contacts, 36a, 36b...
...Latching arm, 37a, 36b...Latching part, 38, 3
8'... Fitting groove (locking part), 39, 39'... Locking metal fitting (locking arm).

Claims (1)

[Scope of Claims] 1. A coil frame having a pair of side plates extending in the axial direction from opposing portions of openings at one end and integrally protruding a contact gap quantity determining spacer from opposing surfaces of the side plates, and the pair of side plates. a pair of contact blocks supported by bridges between the upper edges and between the lower edges, respectively, and having fixed contacts at their tips that abut the upper and lower surfaces of the spacer,
A reed relay characterized in that the pair of contact blocks are held by the side plates by bending the locking arms provided on the contact blocks or the side plates and locking them into opposing locking parts. 2. The lead according to claim 1, wherein the locking arm is provided on one of the contact blocks, and the locking portion is provided on the other contact block to hold both contact blocks in a sandwiched state between the side plates. relay. 3. The reed relay according to claim 1, wherein the locking arm is provided on the side plate, and the locking portion is provided on each of the contact blocks.