JPH10199391A - Breaker for high-frequency - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide desired high-frequency characteristics by bringing at least one contact tongue piece extending from a shield plate of a fixed contact mechanism into contact with a yoke of an electromagnet block positioned at a base upper face. SOLUTION: A wide part is formed at a base part of a grounding terminal 25 protruding downwardly of a shield plate 24 provided with a fixed contact terminal group in a fixed contact mechanism and manufactured by punch press processing of a planar conductive material, and a contact tongue piece 28 is protruded from an upper end rim. An outside face of a yoke 34 of an electromagnet block 30 positioned at a base 10 and a position restraint protrusion 15 protruded on the base 10 are brought into pressure contact with each other with a tip end of the contact tongue piece 28 being sandwiched. Thereby, the yoke 34 can be compatible with a shield plate, and high-frequency characteristics are improved. In addition, the contact tongue piece 28 is extended from an area of a one-side half of the shield plate 24, thereby a movable contact piece is backed between the other-side half area and an opposite yoke, the movable contact pieces can be disposed on the top and bottom, and high-frequency characteristics are further improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency switch, and more particularly to a high-frequency switch mainly for opening and closing a high-frequency current circuit.

[0002]

2. Description of the Related Art Conventionally, as a high-frequency switch, for example, Japanese Utility Model Publication No. 7-23883 has been proposed in order to improve high-frequency characteristics.
There is a high-frequency switch described in Japanese Unexamined Patent Publication (Kokai) No. H10-26095. That is, a vertically long recess is formed at one side edge of the shallow box-shaped base 11, and a long and narrow shield box 70 is accommodated in this recess, and contacts are opened and closed in the shield box 70.

[0003]

However, in the above-described high frequency switch, the yoke 23 of the coil block 20 and the shield box 70 are disposed in the vicinity of the recess.
Are not electrically connected and are not shielded, so that it is difficult to obtain desired high-frequency characteristics.

[0004] In view of the above problems, an object of the present invention is to provide a high-frequency switch having desired high-frequency characteristics.

[0005]

In order to achieve the above object, a high-frequency switch according to the present invention is provided on an upper surface of a base.
In a high-frequency switch in which a fixed contact mechanism having a shield plate and an electromagnet block having a yoke are juxtaposed, at least one contact tongue extending from the shield plate is brought into contact with a yoke of the electromagnet block. There is a configuration.

[0006] The contact tongue may extend from an area of one half of the shield plate. Also, the bent tongue of the contact tongue may be engaged with an upper end of a protrusion protruding from an upper surface of the base, and may be held between the protrusion and a side surface of the yoke.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described with reference to FIGS. This embodiment generally includes a base 10, a fixed contact mechanism 20, an electromagnet block 30, a movable iron piece 40, a movable block 50, and a case 60.

The base 10 comprises a shallow box-shaped base body 11 made of a dielectric material (synthetic resin). A pair of support walls 12 and 13 are protruded from opposite corners of the base body 11 so as to face each other. Further, bearing grooves 12a, 1 for rotatably supporting a movable block 50 described later are provided at upper end portions of the support walls 12, 13.
3a are respectively formed. The support wall 12
The base has a curved curved surface 12b serving as a pivot point of the movable iron piece 40 described later.

Discontinuous insulating walls 14a, 14b, 14c and 14d are provided between the support walls 12 and 13 in a staggered manner. In the vicinity of the insulating wall 14b, the position regulating projection 1 is provided.
5 protrudes, and the upper end of the projection 15 has an engagement recess 15.
a is formed. Further, the position regulating protrusion 15
A positioning ridge 16 is provided on the base body 11 so as to be parallel to the base body 11.

The fixed contact mechanism 20 includes fixed contacts 21a and 2a.
2a having the same shape and having fixed contact terminals 21 and 2a respectively.
2, a common fixed contact terminal 23 having common fixed contacts 23a and 23b, and a shield plate 24. The fixed contact 21a and the common fixed contact 2
3b constitutes a normally closed fixed contact mechanism, and the fixed contact 22a and the common fixed contact 23a constitute a normally open fixed contact mechanism.

As shown in FIGS. 7 and 8, the shield plate 24 is formed by stamping a plate-shaped conductive material into a predetermined shape and pressing the same. A plurality of ground terminals 25 are arranged on the same straight line on the lower side. It protrudes. This ground terminal 2
5 has a wide portion 25a extending toward the fixed contact terminal side.
Are formed. A chamfered portion 25b is formed at an acute angle at the corner of the wide portion 25a. Further, the shield plate 24 includes ground tongue pieces 27a, 2 extending from bending ends 26a, 26b at both ends bent at substantially right angles.
7b is bent at a substantially right angle. Further, the contact tongue piece 2 that contacts the yoke 34 described later from the upper end edge of the shield plate 24
8 protrudes and a movable block 50 described later
The locking claw 29 that locks the return spring 56 protrudes.

The fixed contact terminals 21 and 22, the lower ends of the common fixed contact terminals 23 and the ground terminal 2 of the shield plate 24 are inserted into terminal holes (not shown) of the base 10.
5, the fixed contact terminals 21 and 22, the lower ends of the common fixed contact terminals 23, and the ground terminal 25 are aligned on the same straight line. Also, the wide portion 25a of the ground terminal 25
Project from the bottom surface of the base 10. Furthermore, fixed contact 2
By contacting the back surfaces of 1a, 22a and the common fixed contacts 23a, 23b with the insulating walls 14a, 14d and 14b, 14c, respectively, one-side half of the fixed contacts 21a, 22a and the common fixed contacts 23a, 23b are shielded, so-called strips. The shield structure uses the principle of the line line. Then, the contact tongue 28 engages with the engaging recess 15a of the projection 15 (FIG. 4).

The shield plate 24 is not limited to one having the contact tongues 28 extending from the upper end edge thereof, but has the contact tongues 28 cut and raised from the side as shown in FIG. You may.

An electromagnet block 30 has an iron core 33 having a substantially T-shaped cross section inserted into a center hole 32a of a spool 32 around which a coil 31 is wound. The portion 33b (FIG. 2) is caulked and fixed to one end of a yoke 34 bent in a substantially L-shape. The coil terminals 35, 35 are press-fitted into both end flange portions 32b, 32b of the spool 32, respectively, and the lead wires of the coil 31 are tied and soldered thereto.

Then, the terminal holes 11a,
The coil terminals 35, 35 are press-fitted into 11a, respectively, and the yoke 34 is press-fitted between the projection 15 and the ridge 16, whereby the electromagnet block 30 is positioned at a predetermined position. As a result, the outer surface of the yoke 34 and the protruding portion 15 sandwich the tip of the contact tongue piece 28 of the shield plate 24, and the yoke 34 and the shield plate 24 are pressed against each other. For this reason, the yoke 34 can be used also as a shield plate, and the high frequency characteristics are improved.

The movable iron piece 40 is made of a magnetic material bent in a substantially L-shape, and one end of the movable iron piece 40 is a narrow portion 41. A notch 42 is formed in the vicinity of the front end of the narrow portion 41.

Then, the movable iron piece 40 is fixed to a positioning curved surface 12 b formed at the base of the support wall 12 and the yoke 3.
4 between the tip edge. As a result, the outer corner of the movable iron piece 40 is in line contact with the curved surface 12b, while the inner corner is rotatably supported with the leading edge of the yoke 34 as a fulcrum. Part 33a
Can be contacted. Further, the notch 42 of the movable iron piece 40 can be engaged with the upper end of the protrusion 15, and the narrow portion 41 is formed.
The position of the movable iron piece 40 is regulated such that a predetermined gap is left between the tip of the armature and the yoke 34.

The movable block 50 comprises a movable base 51 and a return spring 56. The movable base 51 is formed by integrally molding movable contact pieces 53a and 53b at lower ends of ridges 52a and 52b extending downward from the front and back surfaces, respectively. Further, the movable base 51 has shaft portions 54, 54 protruding laterally at both end portions thereof. The shaft portion 54 forms a relief by forming a flat surface parallel to the upper and lower sides thereof, and unavoidable burrs are generated by resin molding on the flat surface, so that a smooth rotating motion can be obtained. ing. In addition, the movable base 51 has a pair of engaging projections 55, 55 protruding from the inward surface thereof.

The return spring 56 is formed by pressing a thin leaf spring material into a substantially U-shaped cross section, and has a pair of engagement holes 57, 57 and a protruding projection 58 formed on one surface thereof.
An elastic tongue 59 extends laterally from the remaining one side.

The protrusions 52a, 52b of the movable base 51
During this time, the return spring 56 is positioned and mounted in a horse riding state, so that the engagement hole 57 is engaged with the engagement projection 55, and the movable block 50 is completed.

Next, the shaft 5 of the movable block 50
4 and 54 are formed in the bearing grooves 12a and 13a of the base 10.
, The movable block 50 is rotatably supported. As a result, the movable contact piece 53a faces the fixed contacts 21a and 23b or the ground tongue piece 27a alternately so as to be able to come and go. In addition, the movable contact piece 53b faces the fixed contacts 22a and 23a or the ground tongue piece 27b alternately so as to be able to come and go.

The movable block 50 is urged toward the electromagnet block 30 by locking the tip of the elastic tongue piece 59 of the return spring 56 to the locking claw 29 of the shield plate 24. Therefore, the protrusion 58 of the return spring 56 presses against the narrow portion 41 of the movable iron piece 40. As a result, while the movable contact piece 53a contacts the fixed contacts 21a and 23b,
The movable contact piece 53b presses against the ground tongue piece 27b.

The movable block 50 of this embodiment is manufactured by integral molding and has high dimensional accuracy, so that a high-frequency switch with uniform operating characteristics can be obtained.

The case 60 has a box shape that can be fitted to the base 10, and a positioning protrusion for preventing floating (see FIG. 1) is provided on a portion of the ceiling surface located immediately above the shaft portion 54 of the movable block 50. (Not shown). Then, the case 60 is mounted on the base 10 incorporating the internal components.
Are fitted, the positioning projections face each other while leaving a small gap between the positioning projections and the flat surface of the shaft portion 54. Then, the joining surface between the base 10 and the case 60 is sealed with a sealant, whereby the assembling operation is completed.

Next, as shown in FIG.
0 fixed contact terminals 21, 22, 23 in through hole 71
And the shield plate 24 is inserted into the terminal hole 72.
Of the ground terminal 25 is inserted. A land 73 is formed at the opening edge of the terminal hole 72. For this reason, the wide portion 2 of the ground terminal 25 protruding from the bottom surface of the base 10
5 a is pressed against the land 73. As a result, the shield can be shielded not only inside the switch but also outside the switch, and impedance matching can be achieved over almost the entire transmission path.
High frequency characteristics are improved. Further, since the chamfered portion 25b is formed at the corner of the wide portion 25a, contact with the through hole 71 can be prevented. Therefore, not only impedance matching but also insulation can be ensured. Furthermore, since the chamfered portion 25b is formed at an acute angle, impedance matching can be achieved up to the vicinity of the through hole 71 of the printed circuit board 70, and a switch with even higher high-frequency characteristics can be obtained.

Next, the operation of the high-frequency switch having the above-described configuration will be described. When no voltage is applied to the coil 31 of the electromagnet block 30, the return spring 56
The movable block 50 is moved by the spring force of
It is urged to the zero side. Therefore, the movable contact piece 53a is in contact with the fixed contacts 21a and 23b, and the movable contact piece 53b is in contact with the ground tongue piece 27b. In this case, the position of the movable iron piece 40 pressed against the protruding protrusion 58 of the return spring 56 is regulated by the notch 42 engaging the upper end of the protrusion 15. For this reason, a predetermined gap is formed between the tip of the narrow portion 41 of the movable iron piece 40 and the yoke 34.

When a voltage is applied to the coil 31 to excite it, the one end 43 of the movable iron piece 40 is attracted to the magnetic pole portion 33a of the iron core 33. Therefore, the movable iron piece 40 rotates, and the narrow portion 41 presses the movable block 50 outward against the spring force of the return spring 56. As a result, the movable block 50 pivots outward about the shaft portion 54, and the movable contact piece 53a is separated from the fixed contacts 21a and 23b and contacts the ground tongue piece 27a. Further, the movable contact piece 53b is separated from the ground tongue piece 27b, and the fixed contact pieces 23a, 22
a, and one end 43 of the movable iron piece 40 is attracted to the magnetic pole portion 33 a of the iron core 33.

Next, when the application of the voltage to the coil 31 is released, the movable block 50 is rotated in a direction opposite to the above-described rotation direction by the spring force of the return spring 56, and the movable contact piece 53a is fixed to the fixed contact 21a. , 23b, while the movable contact piece 53b contacts the ground tongue piece 27b, and returns to the original state.

In the present invention, the dielectric located on the back of the fixed contact does not necessarily have to be an insulating wall protruding from the base, but may be a coating or sheet of a dielectric material laminated on the side of the shield plate. Good.

The regulation of the position of the movable block 40 is not limited to the case where the regulation is performed through the protrusion 15 provided on the base 10.
A predetermined gap may be formed by forming an insulating coating on the tip of the narrow portion 41.

[0031]

【Example】

(Example) With respect to the high-frequency switch shown in the above embodiment, high-frequency characteristics were measured in a state where the movable contact piece was separated from the fixed contact. FIG. 10 shows the measurement results.

Comparative Example The high frequency characteristics of the high frequency switch described in Japanese Utility Model Publication No. 6-38354 were measured in the same manner as in the example. FIG. 10 shows the measurement results. In the high frequency switch described in Japanese Utility Model Publication No. 6-38354, a box-shaped shield case having a ground terminal is installed on a base in which fixed contact terminals are insert-molded on the same straight line. A high-frequency current circuit is opened and closed by bringing a movable contact piece into and out of contact with an upper end of the fixed terminal protruding from a bottom surface. However, the yoke of the electromagnet block that drives the movable contact piece and the box-shaped shield case are not electrically connected. Further, the base of the ground terminal extending from the box-shaped shield case does not have a wide portion as in the present embodiment.

As is apparent from FIG. 10, it was found that the high-frequency characteristics in the state where the movable contact piece was separated from the fixed contact as a whole were better in this embodiment. Especially,
Above 200 MHz, the difference is clear. This is considered to be one of the reasons that the yoke 34 and the shield plate 24 are electrically connected, and the yoke 34 is also used as the shield plate. Further, the wide portion 25a provided at the base of the ground terminal 25 of the shield plate 24 comes into contact with the land 71 provided on the printed circuit board 70, so that it is possible to shield not only the inside of the high-frequency switch but also the outside thereof. For this reason, it is considered that one of the reasons is that impedance matching can be achieved over almost the entire area of the transmission path.

[0034]

As is apparent from the above description, according to the high frequency switch according to the first aspect of the present invention, the contact tongue of the shield plate contacts the yoke of the electromagnet block, and the same potential is obtained. I have. For this reason, the yoke can be used also as a shield plate, and a high-frequency switch having desired high-frequency characteristics can be obtained. According to claim 2, the contact tongue extends from the area of one half of the shield plate. For this reason, the movable contact piece can be retrofitted between the remaining one half area of the shield plate and the yoke opposed thereto. As a result, the movable contact pieces can be arranged on the front side and the back side of the shield plate, respectively, and a high-frequency switch having better high-frequency characteristics can be obtained. According to the third aspect, the bent tip of the contact tongue is held between the projection of the base and the side surface of the yoke. For this reason, even when external vibration is applied, not only does the contact tongue not fall off, but it is also constantly in contact with the yoke. As a result, there is an effect that a high-frequency switch with high reliability in high-frequency characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a high-frequency switch according to the present invention.

FIG. 2 is a perspective view of the high-frequency switch shown in FIG.

FIG. 3 is a plan view of the high-frequency switch shown in FIG. 1;

FIG. 4 is a cross-sectional view of FIG.

FIG. 5 is a front partial cross-sectional view when the high-frequency switch shown in FIG. 1 is mounted on a printed circuit board.

6 is a perspective view of a base incorporating the fixed contact mechanism shown in FIG.

FIG. 7 is a perspective view of the fixed contact mechanism of FIG.

FIG. 8 is a perspective view of the shield plate of FIG. 1;

FIG. 9 is a perspective view showing another embodiment of the shield plate.

FIG. 10 is a graph showing high-frequency characteristics measured by moving a movable contact piece away from a fixed contact.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Base, 11 ... Base main body, 12, 13 ... Support wall, 12a, 13a ... Bearing groove, 14a, 14b, 1
4c, 14d: insulating wall, 15: position regulating projection, 15a
... Engagement recess, 16 positioning protrusion, 20 fixed contact mechanism, 21, 22 fixed contact terminal, 21 a, 22 a fixed contact, 23 common fixed contact terminal, 23 a, 23 b common fixed contact, 24 Shield plate, 25 ... ground terminal,
25a: wide part, 25b: chamfered part, 26a, 26b ...
Ends for bending, 27a, 27b ... ground tongue piece, 28
... contact tongue piece, 29 ... locking claw, 30 ... electromagnet block, 3
4 yoke, 40 movable iron piece, 41 narrow part, 42 notch, 50 movable block, 51 movable base, 53
a, 53b: movable contact piece, 54: shaft portion, 55: engagement projection, 56: return spring, 60: case, 70: printed circuit board, 71: through hole, 72: insertion hole, 73: land.

Claims (3)

[Claims] 1. A high-frequency switch in which a fixed contact mechanism having a shield plate and an electromagnet block having a yoke are arranged side by side on an upper surface of a base, wherein the yoke of the electromagnet block extends from the shield plate. A high-frequency switch, wherein at least one contact tongue piece is contacted. 2. The high-frequency switch according to claim 1, wherein the contact tongue extends from a half area of one side of the shield plate. 3. The contact tongue has a bent distal end portion which is engaged with an upper end of a protrusion protruding from an upper surface of the base and is clamped between the protrusion and a side surface of the yoke. The high-frequency switch according to claim 1 or 2, wherein: