JPH0239059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high frequency current switching relay.

Generally speaking, isolation between contact terminals is a problem in high-frequency current switching relays. Therefore, as shown in FIG. 10, a U-shaped card 1 equipped with contact springs 4a and 4b made of wire and driven by an armature of an electromagnetic device, and contact terminals 5a and 5
b, 5c and ground terminals 11a', 11b', 11
There was one in which a contact mechanism was formed with the body 13 in which c' and 11d' were implanted. Card 1 has 2 pieces on both sides
A protruding piece 7, which is formed in a U-shape with different lengths a and 2b and protrudes from the central piece 3 of the card 1, is driven by an electromagnetic device, and the protruding pieces 7 on both sides 2
Contact springs 4 installed at different levels on a and 2b
NC contact terminal 5a, COM contact terminal 5 at a and 4b
b, NO contact terminal 5c, and COM contact terminal 5b can be freely shorted. In addition, contact terminals 5a, 5b,
The contact springs 4a, 4b whose terminals 5c are not short-circuited are brought into elastic contact with the ground terminals 11a', 11b', 11c', 11d'.

However, in such conventional examples,
There was a problem in that the electromagnetic device placed close to the contact mechanism had an adverse effect, resulting in poor high frequency characteristics.

The present invention has been made in view of the above points, and its purpose is to prevent the negative influence from the electromagnetic device by shielding the contact mechanism, and to improve the high frequency characteristics. The purpose of the present invention is to provide a high-frequency current switching relay with a simple structure.

1 and 2 show a high-frequency current switching relay that is the basis of the present invention, in which the COM contact terminal 5b is connected to the NC contact terminal 5a and the NO contact terminal 5.
This figure shows a relay with a so-called 1T structure, which is switched and connected to the electromagnetic device 12. By adsorbing one end of the dogleg-shaped armature 9 to the electromagnetic device 12, the other end of the armature 9 presses the card 1. Contact springs 4a and 4b attached to the COM contact alternately bring the NC contact and the NO contact into contact with the COM contact.

To explain each part in detail, the U-shaped card 1 has both side pieces 2a and 2b having different lengths, and is slidable back and forth. Both sides piece 2
Contact springs 4a and 4b parallel to the center piece 3 of the card 1 are installed at different levels at the tips of the cards a and 2b, respectively. Both contact springs 4a, 4b are made of wire and plated with gold, and the center portions of each contact spring 4a, 4b are supported by the side pieces 2a, 2b of the card 1. The contact terminals 5a, 5b, 5c, which are opened and closed by the contact springs 4a, 4b, are made of gold-plated wire rods, and from the right in the figure are NC contacts, COM contacts, and NO contacts. They are arranged parallel to the contact springs 4a and 4b between them, and are installed in the body 13 as shown in FIG. Each contact terminal 5a, 5b, 5c and contact spring 4
a, 4b and the card 1 are housed in a shield case 6 made of a metal plate with an opening on the top surface, and a protruding piece is provided rearwardly from the central piece 3 of the card 1 through a notch 8 provided on the rear side of the shield case 6. 7 protrudes outside the shield case 6. This protruding piece 7 is arranged opposite to one end of the doglegged armature 9. On the other hand, the front side surface and both left and right side surfaces of the shield case 6 are cut outward and serve as ground connection terminals 10 that hang down from the bottom surface 14 of the shield case 6. Since the shield case 6 is fitted into the recess 15 provided in the body 13, each contact terminal 5
a, 5b, 5c are cut and raised shield case 6
It is inserted into the shield case 6 through a notch 16 formed in the bottom surface 14 and a hole 17 formed in the bottom surface.
In addition, 18 is a ground connection terminal insertion hole bored in the recess 15 of the body 13, and 19 is inserted and locked at one end in a groove 20 provided in the protruding piece 7 of the card 1.
The other end is a restoring spring fixed to the yoke 21 of the electromagnet device 12, and 22 is a metal shield plate covered by the shield case 6.

Thus, the electromagnet device 12 is installed in the body 13, the shield case 6 is fitted into the recess 15 of the body 13, and the contact spring 4 is fitted inside the shield case 6.
After mounting a, 4b and the card 1, the electromagnet device 12 and the card 1 are engaged and connected by the restoring spring 19. Then, the shield plate 22 is placed over the opening surface of the shield case 6, and when the electromagnet device 12 is in a non-excited state, the contact spring 4a is connected to the COM contact terminal 5b and the NC contact terminal 5b.
It is arranged so as to be connected to the contact terminal 5a. When the electromagnet device 12 is energized now, one end of the armature 9 is attracted to the electromagnet device 12, the protruding piece 7 is pressed forward by the armature 9, the card 1 slides forward, and the contact spring 4b becomes the COM contact terminal. 5b and the NO contact terminal 5c are connected. At this time, earth connection terminal 1
If 0 is connected to ground, each contact terminal 5a, 5
The stray capacitance between b and 5c is reduced, and the high frequency characteristics are improved.

FIGS. 3 and 4 show an embodiment of the present invention, in which a relay with a 1T structure similar to the basic example described above has two front and rear sides of the shield case 6, respectively.
Ground terminals 11a, 11b, 11 are cut inward and erected inside the shield case 6.
c, 11d are formed. That is, a pair of ground terminals 11a and 11b formed by cutting and raising the front side of the shield case 6 connect to the NC contact terminal 5a and the COM contact terminal 5b in front of the contact spring 4a.
The contact terminals 5a, 5b are arranged opposite to each other.
and a contact spring 4a between each ground terminal 11a, 11b.
is located. On the other hand, another pair of ground terminals 11c and 11d are located behind the contact spring 4b.
A contact spring 4b is arranged to face the COM contact terminal 5b and the NO contact terminal 5c, and is positioned between each contact terminal 5b, 5c and each ground terminal 11c, 11d. Thus, when the electromagnet device 12 is in the non-excited state, both ends of the contact spring 4b, which are in the open contact state, are brought into contact with the ground terminals 11c and 11d, and when the electromagnet device 12 is in the energized state, both ends of the contact spring 4a are brought into contact with the ground terminals 11c and 11d. are contacted by the ground terminals 11a and 11b. Therefore, the so-called "floating" of the contact springs 4a, 4b when the contacts are opened is eliminated, and the high frequency characteristics are further improved. Moreover, as shown in FIG.
There is no need to provide d′, which simplifies the structure.

5, 6, and 7 show another embodiment in which the COM contact terminal 5b of the 1T structure relay has a bifurcated structure, and between the longitudinally opposing end surfaces of both contact springs 4a and 4b. A distance d is provided between the two to prevent them from overlapping. COM contact terminal 5
b is the shape part 23 and the straight part 24 as shown in Fig. 7a.
You can also connect them vertically, or as shown in Figure b
The shaped portions 25 may be connected. With this configuration, stray capacitance generated at the overlapping portion of both contact springs 4a and 4b can be reduced.

In addition, in the above embodiment, by configuring the bifurcated COM contact terminal 5b with separate contact terminals, the so-called so-called opening and closing of the two pairs of contacts is performed alternately.
Relays of 1a and 1b structure can be configured.

FIGS. 8 and 9 show still another embodiment. This embodiment relates to a so-called 2a structure relay that opens and closes two pairs of contacts simultaneously. That is, both sides 2a and 2b of the U-shaped card 1 are formed to have the same length, and both contact springs 4a and 4b are arranged in a straight line, and the ground terminals 11a, 11b, 11
c and 11d are formed by cutting and raising the rear side of the shield case 6 inward, and are arranged to face each contact terminal 5a, 5b, 5c, and 5d, and are connected to the ground terminals 11a, 11b, 11c, and 11d. Both contact springs 4a, between terminals 5a, 5b, 5c, 5d
4b is positioned. When the electromagnet device 12 is excited, the card 1 moves forward and both contact terminals 5a, 5b, 5c, and 5d are closed simultaneously, and when they are opened, both contact springs 4a and 4b are connected to the ground terminal 11.
a, 11b, 11c, and 11d.

The present invention is constructed as described above, and the contact mechanism for switching high-frequency current driven by an armature is housed in a shield case made of a metal plate. The high frequency characteristics can be improved by preventing the negative influence from the electromagnetic device, and the ground connection terminal is formed by cutting and raising the metal plate of the shield case outward, so it is not necessary to specially plant the ground connection terminal. This has the effect of simplifying the structure for shielding each component. In addition, the metal plate of the shield case is cut and bent inward to form a ground terminal, and the contact spring is in contact with the ground terminal when the contact is opened, so the ground connection terminal can be connected to the ground. Then, since the contact terminal is connected to the ground even when it is opened, the contact terminal does not become in a so-called "floating" state, and stray capacitance is further reduced and high frequency characteristics are improved. Furthermore, since the ground terminal is also formed by cutting and raising the shield case, there is no need to specially install the ground terminal, and "floating" can be prevented.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a basic example of the present invention, Fig. 2 is a front view of the above, Fig. 3 is an exploded perspective view of an embodiment of the invention, Fig. 4 is a front view of the same, and Fig. 5 is a front view of the same. An exploded perspective view of another embodiment, FIG. 6 is a front view of the same as above, and FIG.
Figures a and b are exploded perspective views of the same essential parts as above, Figure 8 is an exploded perspective view of yet another embodiment, Figure 9 is a front view of the same, and Figure 10 is an exploded perspective view of essential parts of the conventional example. 1 is a card, 2a, 2b are side pieces, 3 is a center piece, 4a, 4b are contact springs, 5a, 5b, 5c are contact terminals, 6 is a shield case, 7 is a protruding piece, 8
is a notch, 9 is an armature, 10 is a ground connection terminal, 1
1a, 11b, 11c, and 11d are ground terminals.

Claims (1)

[Claims] 1. The contact mechanism for high-frequency current switching driven by an armature is housed in a shield case made of a metal plate, and the metal plate of the shield case is cut and raised outward to form a ground connection terminal, and the shield case is A high-frequency current switching relay is constructed by cutting and bending a metal plate inward to form a ground terminal constituting a contact mechanism, and a contact spring comes into contact with the ground terminal when the contact is opened.