JPS5810301Y2 - terminal board - Google Patents

Description

[Detailed description of the invention] This invention relates to a terminal board used in switches, etc., and its purpose is to improve the electrical insulation between the terminal rows in devices where multiple rows of terminals are installed. ) is to try to make it better.

A conventional switch equipped with a terminal plate is constructed as follows, taking the bush switch shown in FIGS. 1 to 3 as an example.

That is, 1 is an insulating terminal board in which a plurality of fixed terminals 2 are implanted in a plurality of rows, and a sliding body 4 holding a clip-shaped movable contact piece 3 is arranged on the terminal board 1. A frame 5 that guides the sliding of the sliding body 4 is placed on the plate 1, and a mounting angle 6 having a cross-sectional shape is coupled to the front surface of the frame 5, and the sliding body 4 projects forward from this mounting angle 6. A return spring 8 is fitted into the operating shaft 7 of the
The operating shaft 7 is supported by a spring stopper plate 9 fixed to the tip thereof.

Isolation, which has been a problem in conventional switches with such a configuration, will be explained.

That is, in FIG. 4 showing the schematic structure of the contact portion of the switch, one fixed terminal row 2-A and the movable contact piece 3 form one transmission line (signal system The other fixed terminal 2-B and the movable contact piece 3 supported by the terminal board 1 and placed at an arbitrary distance form another transmission circuit (signal system (2)).

Furthermore, a sliding body 4 (dielectric body) for moving the movable contact piece 3 and a metal frame 5 cover the contact portion, forming a kind of coaxial line.

A plurality of capacitances and inductances are formed between these two transmission lines, and an equal circuit is formed as shown in FIG.

However, in FIG. 5, the insulation resistance valve is omitted.

Here, when a signal is transmitted to one transmission line, coupling occurs between the two lines due to the electric and magnetic fields created around it.
This causes a reduction in isolation.

In other words, the induced component flows to the other transmission circuit.

Here, the capacitance Cs, which causes a decrease in isolation, is formed as shown in Figure 6 when simplified, and C11, C22, and C12 are the distance between terminal rows, the distance between terminal frames, and the insulation. This is the capacitance determined by shape factors such as the dielectric constant of the substrate and sliding body, and the conductor cross-sectional area of the movable contact piece and terminal.

Therefore, in order to increase the isolation, the mutual capacitance C12 may be decreased.

The capacitance C12 can be reduced by increasing the spatial distance between the terminal rows, by reducing the area of conductors such as terminals and movable contact pieces, or by using shield plates between the terminal rows for electrostatic shielding. is possible.

This invention attempts to improve isolation by electrostatically shielding between terminal rows with a shield plate, and also achieves this with an extremely simple configuration and eliminates the drawbacks of the conventional method. An example will be explained with reference to the drawings from FIG. 7 onwards.

First, Fig. 7 shows a switch equipped with a terminal board according to an embodiment of the present invention, and the same components as the conventional switch shown in Figs. 1 to 3 are given the same numbers and detailed explanations are given. The explanation will be omitted.

In FIG. 7, 15 is a fixed terminal, 16 is an insulating plate, and 24 is a shield plate.

Continuing with the explanation of the specific structure of the terminal plate portion indicated by the numbers 15, 16, and 24 above, using the drawings from FIG. Several terminals 15 are lined up in a row on the insulating plate 16 and have an insert bottom shape.

This terminal is made by punching out a metal plate with the shape shown in Figure 13.
After insert molding a single piece, the upper part is cut off to divide it into multiple pieces.

Furthermore, a coupling protrusion 19 and a coupling recess 20 are formed at a constant interval on one side of the insulating plate 16 so that the insulating plate 16 can be butted against and coupled to an insulating plate having another terminal.

In addition, a through hole 2 is provided in the portion of the terminal 15 located in the insulating plate 16.
1 is formed, and the synthetic resin constituting the insulating plate 16 is also inserted into the through hole 21 to prevent the terminal 15 from coming out from the insulating plate 16.

As shown in FIG. 14, two insulating plates 16 having such terminals 15 are molded symmetrically, and a shielding plate 24, which is a conductive metal body, is sandwiched between them. If the press-fit connection is made in a manner that corresponds to the connection recess 20 of the 15th
A terminal board with two rows of electrically completely separated terminals as shown in the figure is obtained.

In this case, the shielding plate 24 is provided with a through hole corresponding to the coupling protrusion 19° and the recess 20, and by passing the protrusion 19 through the through hole, the removal is prevented. It goes without saying that the attachment can be done by other methods such as scissors, press-fit pins, adhesives, and ultrasonic welding without having to make a through hole in 24 for the insertion of the protrusion 19.

Further, the shielding area of the shielding plate 24 may be such that it covers from the movable contact piece 3 to the printed circuit board soldering leg of the fixed terminal 15, or may be such that it contacts only the coupling surface 21 as shown in the figure.

That is, these can be freely changed depending on the required value of isolation.

Although the insulating substrate 16 is an insert molded product made of synthetic resin, it may be a conventionally known phenol laminate or the like.

In addition, if a coupling recess is provided on both sides of the insulating plate 16 and three or more terminals are coupled with this in the middle as shown in FIG. 15, multiple rows and multiple circuits can be formed. It can be developed as a board.

As explained above, according to the terminal board of the present invention, by providing the coupling protrusion and the coupling recess on the insulating plate, it is easy to form a terminal board with multiple rows, and when the coupling protrusion and the coupling recess are engaged, By inserting and assembling the shielding plate between the terminal plates, it is possible to provide a terminal plate having a terminal structure with good isolation, and it is possible to reduce costs and improve performance.

[Brief explanation of drawings]

Figure 1 is a perspective view of a switch with a conventional terminal board;
The figure is a partially cutaway side view of the switch, Figure 3 is an exploded perspective view of the switch, Figure 4 is a schematic diagram of the contact section of the switch, and Figure 5 is an equivalent circuit diagram of the contact section. FIG. 6 is a practical view of FIG. 5, FIG. 7 is a partially cutaway side view of a switch equipped with a terminal board according to an embodiment of the present invention, and FIG. 8 is a configuration of the same terminal board. 9 is a front view of the insulating plate, FIG. 10 is a bottom view of the same, and FIG. 11 is a side view of the insulating plate.
Fig. 12 is a sectional view of the same, Fig. 13 is a plan view showing the state before insert molding of the terminal, Fig. 14 is an exploded bottom view showing the state in which two terminal boards are joined, and Fig. 15 is the state in which the same is assembled. FIG. 16 is a bottom view showing another combination example. 15...Terminal, 16...Insulating plate, 19
......Joining protrusion, 20...Joining recess, 2
4... Shielding plate.

Claims (1)

[Scope of utility model registration request] Terminals are coupled to an insulating plate in an aligned manner, a coupling protrusion and a coupling recess are provided on the side surface of the insulating plate, and a conductive shielding plate is provided, and a plurality of insulating plates are connected to the protrusion with the shielding plate interposed therebetween. Terminal plates that are connected to each other by engaging recesses.