JP4165425B2 - High frequency switch - Google Patents

Description

  The present invention relates to a high frequency switch used for, for example, a high frequency transmission line.

  Conventionally, as a high-frequency switch, switching is performed by switching a contact (movable contact) with a solenoid (driving means) and bringing the contact into contact with a pair of contact terminals (fixed contact) or non-contacting. Is known (see, for example, Patent Document 1).

  In the above high-frequency switch, even if the switch is off, that is, the contact is not in contact with the contact terminal, discharge may occur between the pair of contact terminals via the contact. It is necessary to ensure the characteristics.

  In order to ensure such isolation characteristics, as shown in FIG. 9, a conductive base 1A and a pair of contact terminals 20a, 20b held in an insulated state by the base 1A via insulating members 30a, 30b. A contact 40 is disposed between the contact 40 and the solenoid 100 attached to the base 1A. The contact 40 is switched between a state in contact with the base 1A and a state in contact with the pair of contact terminals 20a and 20b. In this way, the contact 40 may be brought into contact with the grounded conductive base 1A in the switch-off state.

  The contact 40 that requires one surface to be in contact with the contact terminals 20a and 20b and the other surface to be in contact with the base 1A can generally be formed by an etching process that is performed while chemically melting the material. However, the etching process has a problem of high processing cost and lack of shape stability.

Therefore, it is conceivable to form the contacts 40 by stamping the plate material.
JP 2000-331587 A

  However, when the contact 40 is formed by stamping a plate material, burrs are generated at the peripheral edge of the contact 40, and the surface on which the burrs are generated is a surface that contacts the base 1A. The contact characteristics may deteriorate, and conversely, contact with the contact terminals 20a and 20b may be unstable.

  In view of such circumstances, an object of the present invention is to provide a high-frequency switch that can stably manufacture a contact and a contact terminal while ensuring isolation characteristics and can be manufactured at low cost.

According to the first aspect of the present invention, a contact is disposed between a conductive base and a pair of contact terminals held in an insulated state on the base, and the contact is attached to the base, so that the contact is made with the base. In a high-frequency switch that is switched between a state of being in contact with and a state of being in contact with a pair of contact terminals, a deformed through-hole having a square corner and a narrow slope is formed in the central portion of the contact. The protruding portion of the card driven by the solenoid has a tip portion corresponding to the shape of the through hole of the contact, and the tip portion is inserted into the through hole of the contact and fixed by caulking, The contact is formed by punching a plate material with a press, and the surface on the opposite side of the surface where burrs are generated by this punching is in contact with the base. A hemispherical protrusion is formed on the surface where the burr is formed so as to protrude in the direction of the contact terminal, and this protrusion protrudes higher than the height of the burr generated by the punching process. The protrusion is configured to come into contact with the contact terminal.

  According to a second aspect of the present invention, in the high frequency switch according to the first aspect, the contact is formed as a substantially strip-shaped single contact, and the protrusion is formed on the contact.

According to the first aspect of the present invention, the contact is formed by punching the plate material with a press, and the protrusion is formed on the surface on which the burrs are generated by the punching, so that the contact can be manufactured at a lower cost than the etching process. In addition, the protrusion protruding from the burr height can provide a stable contact state with the contact terminal even if a burr is generated. Further, since the surface on the opposite side to the surface on which the contact burr is generated is brought into contact with the base, isolation characteristics can be ensured.
In addition, the contact through-hole is formed by deforming a square corner into a narrow-angled two-sided slope, and inserting the tip of the protruding portion of the card having a shape corresponding to the deformed through-hole into the contact through-hole. Since the contact is fixed, the contact cannot be inserted into the tip portion opposite to the front and back, and the protrusion of the contact is guaranteed to face downward.

  According to the second aspect of the present invention, since the contact is formed as a substantially strip-shaped single contact and the protrusion is formed on the contact, a good high frequency characteristic can be obtained.

  The best mode for carrying out the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the high-frequency switch includes a conductive base 1, a pair of contact terminals 2a and 2b held in an insulated state by the base 1, and a base 1 and contact terminals 2a and 2b. And a contact 4A disposed therebetween.

  The base 1 is made of a conductive metal material such as aluminum, and a corner portion of a rectangular parallelepiped side surface is chamfered.

  On the upper surface of the base 1, as shown in FIG. 3, a recess 1b that is recessed in a long hole shape is formed so as to extend in the longitudinal direction, and screw holes 1e are formed on both sides in the longitudinal direction of the recess 1b. Is formed. Further, a through hole 1c penetrating in the vertical direction is formed at the center of the bottom surface of the recess 1b.

  Further, the lower surface of the base 1 is formed with a transverse groove 1a that opens downward and extends in the longitudinal direction, and has two fitting portions 1f that are recessed in a circular shape so as to straddle the transverse groove 1a. Has been. Further, a pair of bottomed fixing holes 1d are formed near both ends of the upper surface of the transverse groove 1a.

  The pair of contact terminals 2a and 2b and the contact 4A are disposed in the transverse groove 1a, and the sub-base 5 is disposed below the pair of contact terminals 2a and 2b.

  The contact terminals 2a and 2b are insert-molded in insulating members 3a and 3b such as liquid crystal polymer resin. The insulating members 3a and 3b are formed in a shape that fits into the transverse groove 1a of the base 1, and projections 3c and 3d that fit into the fixing holes 1d of the base 1 are formed on the upper surface thereof. The protrusions 3c and 3d are press-fitted into the fixing hole 1d, so that the contact terminals 2a and 2b are held in the base 1 in an insulated state.

  As shown in FIG. 4, the contact 4A is formed as a substantially strip-shaped single contact, and a deformed through-hole 4a is formed at the center thereof. The contact 4A is preferably one in which a plate material such as beryllium copper having a thickness dimension of about 0.3 to 0.6 mm and high heat resistance is punched with a press and plated with gold.

  As shown in FIG. 5, the contact 4A has a surface on which the burr 4c is generated by the punching process facing the contact terminals 2a and 2b, and the opposite surface is the upper surface side of the transverse groove 1a of the base 1. It is arranged to face.

  Also, hemispherical protrusions 4b are formed in the vicinity of both ends of the contact 4A so as to protrude in the direction of the contact terminals 2a and 2b. The protrusion 4b is set to a height that protrudes higher than the height of the burr 4c generated by the punching process.

  The sub-base 5 is formed in a bowl shape and is fitted and fixed to the transverse groove 1a and the fitting portion 1f of the base 1, thereby closing the transverse groove 1a opened downward and holding the base 1 in the above-described manner. The members 3a and 3b are fixed.

  On the other hand, a card 6, a card spring 7, and a cylindrical card 8 are arranged in order from the bottom in the recess 1 b formed on the upper surface of the base 1, and between the bottom of the recess 1 b and the card 6. A pair of return springs 9 are arranged. And the drive means which moves the contact 4A by these components 6-8 and the solenoid 10 attached to the base 1 is comprised.

  The card 6 is made of an insulating resin or the like, and has a base portion 6a that fits into the concave portion 1b of the base 1 and a protruding portion 6b that protrudes downward from the central portion of the base portion 6a. A pair of convex portions 6d projecting downward is formed on both sides of the projecting portion 6b on the lower surface, and a pair of convex portions 6e projecting upward are formed on the upper surface on the opposite side.

  The protruding portion 6b of the card 6 protrudes from the through hole 1c of the concave portion 1b of the base 1 into the transverse groove 1a, and is inserted into the through hole 4a of the contact 4A and fixed by heat caulking.

  The through-hole 4a of the contact 4A is formed such that one corner of the quadrangle is deformed with a narrow slope and a tip portion 6c of the protruding portion 6b is formed in a shape corresponding to this shape. Therefore, the contact 4A cannot be inserted into the tip portion 6b in the opposite direction, and it is ensured that the protrusion 4b of the contact 4A faces downward.

  The card spring 7 is a flat spring and has a pair of holes 7 a inserted through the convex portions 6 e of the card 6 so that the central portion of the card spring 7 is pushed by the card 8. ing.

  The card 8 is made of an insulating resin or the like, and transmits the driving force of the solenoid 10 to the card spring 7.

  The return spring 9 is a coiled compression spring, and is guided by the convex portion 6d of the card 6 to urge the card 6 upward, and the contact 4A attached to the protruding portion 6b of the card 6 is used as the base 1. It is brought into pressure contact with the upper surface of the transverse groove 1a.

  Thus, since the contact 4A is pressed against the upper surface of the transverse groove 1a by the urging force of the return spring 9, it is set to the above-described thickness so as not to bend.

  The solenoid 10 is attached to the upper surface of the base 1 by a bolt B1 screwed into the screw hole 1e of the base 1.

  The solenoid 10 includes a columnar movable iron core 11, a cylindrical insulating bobbin 12 that houses the movable iron core 11, and a coil 13 in which a conductor wire is wound around a side peripheral portion of the bobbin 12. And a fixed iron core 14 disposed below the movable iron core 11, a yoke 15 that fixes the fixed iron core 14 and covers the bobbin 12 in a U shape from below, and is fitted to the upper end of the bobbin 12. A rectangular ring-shaped yoke 16, a plate 17 that is fitted to the left and right upper ends of the yoke 15 and covers the yoke 16 in a U-shape from above, and a cover 18 that covers the whole in a U-shape from above It has.

  A through hole 14a is formed at the center of the fixed iron core 14, and the card 8 is inserted into the through hole 14a.

  When no current flows through the coil 13, the movable iron core 11 is biased to a position away from the fixed iron core 14 by the pair of return springs 9 via the card 8, the card spring 7, and the card 6. ing.

  On the other hand, when a current is passed through the coil 13, the movable iron core 11 is magnetized and moves toward the fixed iron core 14, so that the card 8, the card spring 7, and the card 6 are moved along with the movement of the movable iron core 11. In order to move downward, the protrusion 4b of the contact 4A attached to the card 6 comes into contact with the contact terminals 2a and 2b (see FIG. 5).

  At this time, even if the burr 4c is formed on the lower surface of the contact 4A, the protrusion 4b is set to a height that protrudes higher than the burr 4c height as described above. A stable contact state can be obtained by the protrusion 4b without contact.

  In the above embodiment, the contact 4A is formed by stamping the plate material with a press, and the protrusion 4b is formed on the surface where the burr 4c is generated by this punching process. Therefore, the contact 4A is manufactured at a lower cost than the etching process. And a stable contact state can be obtained.

  Further, since the surface of the contact 4A opposite to the surface on which the burr 4c occurs is brought into contact with the base 1, the isolation characteristics can be ensured.

  In the above embodiment, the contact 4A formed on a substantially strip-shaped single contact is shown. However, as shown in FIGS. 6A and 6B, each end of the contact 4B formed on a bifurcated twin contact is shown. It is also possible to form the protrusion 4b on the part.

  However, if the contact 4B has such a shape, when the contact 4B is in contact with the contact terminal 2b in an inclined state (see FIG. 6C), a signal once wraps around a portion that does not contact the contact terminal 2b. A path loss may occur (see arrow a in FIG. 6D), and the high-frequency characteristics may deteriorate.

  This is because, as shown in FIGS. 7 and 8, the bifurcated contact 4B is in a one-sided contact state (see the broken line line in FIG. 7 and the broken line line in FIG. 8). 8 (see the broken line D in FIG. 8), the insertion loss increases, and the standing wave ratio for 50Ω also increases.

  On the other hand, if the contact 4A is formed as a substantially strip-shaped single contact, there is no path loss, which is advantageous because good high-frequency characteristics can be obtained.

It is front sectional drawing of a high frequency switch. It is a disassembled perspective view of a high frequency switch. (A) is a perspective view of a base, (b) is a perspective view of the state which turned over the base. (A) is a top view of a contact, (b) is an II line end view in (a). It is side surface sectional drawing which shows the state which the protrusion of the contact contacted the contact terminal. It is a contact of a modified example, (a) is a plan view, (b) is an end view taken along line II-II in (a), (c) is a cross-sectional view showing a state in which the contact is in contact with the contact terminal in an inclined state, (D) is the figure which represented the flow of the signal at that time typically with the arrow. It is a graph which shows the insertion loss with respect to the frequency when the contact formed in the bifurcated twin contact hits one side and both ends. It is a graph which shows the standing wave ratio with respect to 50 (ohm) for every frequency when the contact formed in the bifurcated twin contact hits one side and when it hits both. It is a schematic diagram of the conventional high frequency switch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2a, 2b Contact terminal 3a, 3b Insulating member 4A, 4B Contact 4a Through-hole 4b Protrusion 4c Burr 5 Sub-base 6 Card 7 Card spring 8 Card 9 Return spring 10 Solenoid

Claims (2)

A conductive base (1), a pair of contact terminals (2a, 2b) which are held in an insulated state on the base (1) are disposed contact (4A) is between, the contact (4A), said the base (1) solenoid attached to (10), and a state of contact with the base (1), a pair of contact terminals (2a, 2b) in the high frequency switch which is to be moved switchable between a state in contact with,
The contact (4A) is formed with a deformed through-hole (4a) having a square corner and a narrow slope, and the protrusion (6b) of the card (6) driven by the solenoid (10) is formed on the contact (4A). A tip portion (6c) having a shape corresponding to the shape of the through hole (4a) of the contact (4A) is formed, and the tip portion (6c) is inserted into the through hole (4a) of the contact (4A). On the other hand, the contact (4A) is formed by punching a plate material with a press, and the surface opposite to the surface on which the burr (4c) is generated by this punching is in contact with the base (1) . A hemispherical protrusion (4b ) is formed on the surface on which the burr (4c) is generated so as to protrude in the direction of the contact terminals (2a, 2b) , and this protrusion (4b ) is caused by the punching Is set to a height that protrudes than the height of the Li (4c), a high-frequency switch this protrusion (4b) is equal to or intended to come into contact with the contact terminals (2a, 2b). The high-frequency switch according to claim 1, wherein the contact (4A) is formed as a substantially strip-shaped single contact, and the protrusion (4b) is formed on the contact (4A) .

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