JP2555596Y2 - Reed relay - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a reed relay which is turned on and off by magnetism, and more particularly to a highly reliable reed relay having a structure in which a disconnection of an exciting coil hardly occurs.

[0002]

2. Description of the Related Art FIGS. 2 and 3 show the structure of a conventional reed relay. The reed relay shown in FIG. 2 shows a reed relay having a structure called a resin impregnation method. In other words, the entire structure of the magnetic shield case 1 is filled with the resin 2 so as to prevent moisture and the like from invading from the outside.

More specifically, the structure of the reed relay element 3 will be described in detail. The reed relay element 3 is inserted into the hollow part of the insulating bobbin 4, and both terminals of the reed relay element 3 are connected to the internal terminal 6. The insulating bobbin 4 has flanges 4A and 4B at both ends, and the exciting coil 8 is wound around an annular groove formed between the flanges 4A and 4B. Terminal support pieces 9A and 9B are formed integrally with the insulating bobbin 4 so as to protrude from the edges of the flanges 4A and 4B in the axial direction of the insulating bobbin 4, and a plurality of lead pieces 11 are insert-supported on the terminal support pieces 9A and 9B. The plurality of lead pieces 11 protrude from the respective end surfaces of the terminal support pieces 9A and 9B in a direction parallel to the axis of the insulating bobbin 4, and the protruding ends are the external terminals 12 and 13.

The coil leads 8A at both ends of the exciting coil 8
8B is connected to the internal terminal 7. A conductive pipe 14 for electrostatic shielding is mounted on the inner wall of the hollow portion of the insulating bobbin 4,
The conductive pipe for electrostatic shield 14 is connected to the internal terminal 5. FIG. 3 shows the structure of a reed relay called a hollow type. In the reed relay having this structure, the reed relay element 3 is inserted and attached to the axial center position of the cylindrical magnetic shield case 1, and a conductive pipe 14 for electrostatic shielding is attached to the outer periphery of the reed relay element 3. The insulating bobbin 4 is mounted on the outer circumference of the shield conductive pipe 14, and the exciting coil 8 is wound on the outer circumference of the insulating bobbin 4.

[0005]

According to the resin-impregnated reed relay shown in FIG. 2, when a thermal shock is applied,
The connection between the terminal of the reed relay element 3 and the internal terminal 6, the connection between the conductive pipe 14 for electrostatic shielding and the internal terminal 5, and the coil leads 8 A and 8 B of the exciting coil 8 according to the thermal expansion of the resin 2. There is a drawback in that stress such as elongation and compression is applied from the resin 2 and a contact part comes off and a disconnection occurs. In particular, when the winding of the exciting coil 8 uses a thin wire such as 40 μφ, the rate of occurrence of this disconnection accident is high.

On the other hand, the hollow type reed relay shown in FIG. 3 has a low incidence of disconnection of the coil leads 8A and 8B, but has a disadvantage in that the manufacturing cost is high due to its complicated structure and complicated assembly. There is. The reed relay element 3, the conductive pipe 14 for electrostatic shield, and the exciting coil 8 are connected to the terminal of the reed relay element 3 and the pipe 14 for electrostatic shield.
Is supported inside the cylindrical magnetic shield case 1 by the connection strength of the above, there is a disadvantage that durability against vibration is poor.

[0007]

In the present invention, except for removing the resin from the inside of the magnetic shield case 1, the arrangement and structure of the reed relay element, the insulating bobbin, the exciting coil, the terminal support pieces, the internal terminals, the magnetic shield case, and the like. Is the same as the resin-impregnated reed relay shown in FIG. 2, and the sealing resin is only between the winding surface of the exciting coil and the magnetic shield case and between the terminal support piece and the magnetic shield case. Has a hollow structure.

According to the structure of the present invention, since the coil lead of the exciting coil is not embedded in the resin, even if the resin is slightly deformed due to thermal expansion, the terminals and the internal terminals of the reed relay element and the conductive pipe and the internal terminal are formed. No stress is applied to each connection portion and the coil lead. As a result, it is possible to provide a reed relay having a low occurrence rate of a disconnection accident and a disconnection accident of a connection portion.

[0009]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and redundant description thereof will be omitted. However, in the present invention, terminal supports are integrally formed with the insulating bobbin 4 from the edges of the flanges 4A and 4B of the insulating bobbin 4. In the reed relay having the structure in which the pieces 9A and 9B are formed to project, the sealing resin 2 is filled with a gap between the magnetic shield case 1 and the winding surface of the exciting coil 8, the magnetic shield case 1 and the terminal support pieces 9A. , 9B. The gap between the reed relay element 3 and the conductive pipe 14 for electrostatic shielding is fixed with the resin 2 as in the conventional case.

[0010]

According to the structure of the present invention described above, the sealing resin 2 has a gap between the winding surface of the exciting coil 8 and the magnetic shield case 1 and the magnetic shield case 1 and the terminal support pieces 9A and 9B. Of the internal terminal 5, the conductive pipe 14 for electrostatic shielding, and the reed relay element 3
Terminal and internal terminal 6, coil lead 8 of exciting coil 8
A, 8B and each connection point between the internal terminal 7 and the coil lead 8
A and 8B can be structured so as not to contact the sealing resin 2.

As a result, the connection points and the coil leads 8A and 8B are not subjected to stress due to thermal expansion from the resin 2, so that there is no danger of an accident such as a disconnection accident or a disconnection of the connection part, and therefore reliability is low. A high reed relay can be configured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining a conventional technique.

FIG. 3 is a sectional view similar to FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic shield case 2 Resin 3 Reed relay element 4 Insulating bobbin 5, 6, 7 Internal terminal 8 Exciting coil 8A, 8B Coil lead 9A, 9B Terminal support piece 11 Lead piece 12, 13 External terminal 14 Electrostatic shield conductive pipe

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 54-146333 (JP, U) Japanese Utility Model Sho 59-164139 (JP, U) Japanese Utility Model Sho 59-180354 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A. First Embodiment Formed by a cylindrical body,
B. an insulating bobbin having flanges formed at both ends; B. a terminal support piece protruding from a part of the flange of the insulating bobbin in the axial direction of the insulating bobbin; It is supported by this terminal support piece, and one end is led out from the end face of the terminal support piece, protrudes in a direction parallel to the axis of the insulating bobbin to be an external terminal, and the other end is drawn out from the flat surface of the terminal support piece. D. a plurality of lead pieces led out in a direction orthogonal to the axis of the insulating bobbin and serving as internal terminals; B. a reed relay element inserted through the hollow portion of the insulating bobbin and having terminals connected to a pair of internal terminals formed by the lead pieces; B. an exciting coil wound around the insulating bobbin and having both ends connected to another set of internal terminals formed by the lead pieces; G. a magnetic shield case in which an opening is fitted to the terminal support piece and covers the excitation coil, the reed relay, and the internal terminal; A gap between the inner surface of the magnetic shield case and the winding surface of the excitation coil and a gap between the magnetic shield case and the terminal support piece are filled to provide a coil lead between the internal terminal and the excitation coil. And a resin that hollows out the existing part and shields the hollow part from the outside air.