JPS6361738B2 - - 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 the fixed contacts 9a and 9b are connected to the fixed contacts 9a and 8b, the fixed contacts 9a and 9b are bent in the longitudinal direction (arrow C in Fig. 1) due to warpage during manufacture of the fixed contacts 9a and 9b and differences in the balance of bonding pressure. It was easy to lean toward. Also, on the opposing surfaces of the halves A and B, the half coil frames 1a and 1
A slight warp was formed on the joint surface of b. 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 sensitivity and open 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, the fixed contacts 9a and 9b are
Solder flux adhered to the contact surfaces of a 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 FIG. 1).
Even when the main body is made by joining the halves A and B, there is no effect on the spacer 18, so there is no effect of warpage, and variations in gap accuracy of the contacts are eliminated.

This spacer 18 can be easily manufactured integrally with the coil frame 17 by molding means. At that time, the coil frame 17 is molded at once with the upper opening 20 formed, without being molded separately.
0 is easy to install, and the work of joining the halves together and the number of parts required in the conventional method can be reduced. On the other hand, after winding the coil 11 around the coil frame 17 and soldering it, the leads 19 and fixed contacts 9a, 19b can be removed. can be assembled, so 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 upper opening), the fixed contact insertion groove 24, the magnet insertion part 25, and the fixed contact 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. Earth terminal 2
7 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
There is also a similar case where the fixed contact is fixed using a press-fit method.

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.

A first embodiment of this invention is shown in FIG. 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. This side plate 29
A spacer 30 is made to protrude from the opposing surface of the molded upper spacer 30 to maintain accurate parallelism between the molded upper spacer 30 and the lead fixing portion 23'. In addition, receiving protrusions 33a to 33c are provided on the upper and lower surfaces of the contact block holding side plate 29.
The contact blocks 31a and 31b formed by joining the fixed contact blocks 35a and 35b to the flat magnetic pole piece 32 have elastic arms 34a with claws that engage with the receiving protrusions 33a to 33c.
-34d are integrally formed and both are elastically locked. Because of this configuration, in addition to the effects of the proposed example, this embodiment has the contact blocks 31a,
31b to the end of the coil frame 17', and the contact blocks 31a and 31b can be attached and detached with a single touch using the elastic arms 34a to 34d, so that the relay characteristics can be easily adjusted during assembly. Calibration work becomes easier and fixed contacts can be replaced. In addition, even if it is repeatedly attached and detached, the elastic arms 34a to 34d are used to hold it, so that the holding force remains unchanged and the fixing structure does not become complicated. In addition, the contact block 31 does not require separate parts.
There is an advantage that both a to 31b can be punched and formed using the same mold. This is the same as other proposed examples. In addition, the elastic arms 34a to 34d with claws are
It is better to make it longer than your feet.

The second embodiment of this invention is shown in FIGS. 13 to 1.
It is shown in Figure 6. In other words, with this reed relay,
One contact block 31b is provided with elastic arms 36, 36', and the other contact block 31a' is provided with elastic arms 36, 36'.
The contact blocks 31'a, 31b are obliquely provided with engagement recesses 37, 37' that are elastically engaged with the contact blocks 31'a, 31b.
The flat magnetic pole pieces 38a, 38b are insert-molded, and the contact guide groove 369, magnet guide recess 40, and output terminal 41 are formed, and the fixed contacts 35a, 35 are formed by insert molding.
b is inserted into the contact guide groove 369 and the magnetic pole pieces 38a,
38b, contact block 31'a, 3
1'b are supported in a bridging state with the upper and lower edges of the side plate 29, and the magnet 3 is placed in the guide recess 40 and arranged so that the fixed contacts 35a and 35b are in contact with the upper and lower surfaces of the spacer 30. There is. The rest is the same as the proposed example and the first example. As a modification, if each of the contact blocks 31'a and 31'b has an elastic arm and an engaging recess, a fixed contact configuration can be achieved by manufacturing one type of contact block (other than one output terminal 34). (bent in the required direction after forming).

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 each having a bridge support between the upper and lower edges of the pair of side plates and having fixed contacts at their tips that abut the upper and lower surfaces of the spacer; Since the arm is detachably engaged with the side plate, it is possible to stabilize and improve contact gap accuracy and electric/magnetic characteristics, simplify manufacturing and reduce costs.
Calibration work for relay characteristics is facilitated, fixed settings can be easily replaced with a single touch, holding force remains unchanged even after repeated attachment and detachment, and the number of parts does not increase.

[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, FIG. 8 is a cross-sectional view along the line 7, and FIG. 9 is a sectional view of the reed relay in the proposed example. 10 is a longitudinal sectional view of the reed relay, FIG. 11 is a half sectional view taken along the line XI-XI, and FIG. 12 is an exploded perspective view of the reed relay in the first embodiment of the present invention. FIG. 13 is an exploded perspective view of the second embodiment, FIG. 14 is a partial plane half-sectional view thereof, FIG. 15 is a half-sectional side view thereof, and FIG. 16 is a partial front view thereof. 17'...Coil frame, 31a, 31b, 31'
a, 31'b... Contact block, 30... Spacer,
35a, 35b... Fixed contacts, 33a to 33c...
...Latching projections, 34a to 34d, 36, 36'
...Elastic arm, 37, 37'...Engagement recess.

Claims (1)

[Scope of Claims] 1. A coil frame having a pair of side plates extending in the axial direction from the relative inside of an opening at one end, and a contact gap determining spacer integrally protruding from opposing surfaces of the side plates; A pair of contact blocks are bridge-supported between the upper and lower edges, respectively, and have fixed contacts at their tips that contact the upper and lower surfaces of the spacer, and are attached to and detached from the side plate by elastic arms provided on the contact blocks. A reed relay characterized by freely engaging. 2. The reed relay according to claim 1, wherein the elastic arm is provided on each of the contact blocks, and a locking portion thereof is formed on the side plate. 3. The reed relay according to claim 1, wherein the elastic arm is provided on one of the contact blocks, the locking portion thereof is provided on the other contact block, and the side plate is held between the pair of contact blocks.