JP4591455B2 - High frequency relay and television tuner and radio relay apparatus using the same - Google Patents

Description

  The present invention relates to a high-frequency relay used for switching high-frequency signals such as television broadcasting, and the television tuner and wireless relay device using the high-frequency relay.

  Some of the television tuners are equipped with the high-frequency relay. For example, in a product for North America, switching between a terrestrial television signal and a cable television signal is performed. Also, in wireless relay devices for mobile phones and television broadcasts, a plurality of power amplifiers are disconnected from ones that have failed or to be maintained, and stub switching is performed to adjust the impedance deviation due to the disconnection. Therefore, the high frequency relay is used.

  In the high frequency relay used for such applications, the impedance of the transmission line is set to 75Ω in the television tuner, whereas it is set to 50Ω in the wireless relay device. Therefore, the present applicant previously proposed Patent Document 1 so as to easily cope with such a difference in impedance. In the prior art, in a high frequency relay in which a fixed contact and a movable contact are housed in a shield member, impedance matching is performed by changing the shape of either the shield member or the movable contact forming the shield space. It is to let you.

As a result, the terminal pitch of the fixed contact, and hence the insulating base, the casing covering it, the contact mechanism, the drive mechanism, and the like can be used without changing the impedance.
JP 2001-155613 A

  In the above-described prior art, although the impedance can be adjusted by changing the shape of the shield member and the movable contact, there are cases where it is difficult to adjust the size as the size is further reduced. Specifically, in the above-described conventional technology, in response to the reduction in impedance by the shield member, a step is provided on the shield member as shown in FIG. 7 of the same publication, or it is folded back as shown in FIG. 10 of the same publication. Thus, the shield member is brought close to the curved movable contact in contact with the fixed contact.

  On the other hand, for example, a common contact is provided at the center, and individual contacts are provided on both sides of the common contact. The movable contact is provided on one side of the straight line and the other contact is provided on the other side. In the case of a high-frequency relay in which the movable contact is arranged on the other side, the two movable contacts are driven by a common card, one movable contact is normally on, and the other movable contact is normally off, the movable contact is one When the individual contact side is separated from the shield member, the shield member is approached on the other individual contact side. In this case, if the distance from the shield member near the nearest contact point (the top of the curve of the movable contact point) becomes narrow due to the low impedance as described above, a short circuit may occur. For this reason, it is necessary to tighten the positional accuracy of the movable contact, and hence the drive mechanism.

  An object of the present invention is to provide a high-frequency relay capable of easily obtaining a desired impedance, a television tuner using the same, and a wireless relay device.

The high-frequency relay of the present invention includes a contact mechanism and a drive mechanism that drives the contact mechanism, and the contact mechanism is driven by displacement by a fixed contact extending from an insulating base and the drive mechanism. A plate-like movable contact, and the fixed contact and the movable contact are accommodated in a shield member, and the high frequency relay can be used for a plurality of impedances. The high frequency relay uses the shield member for high impedance. And the low impedance impedance can be used selectively for the plurality of impedances, and the high impedance shield member can be provided with a movable contact side and a non-side provided with respect to the fixed contact. And, the distance to the fixed contact is formed in a flat plate shape equal to each other, the shield member for low impedance, And side moving contact is provided is formed in the flat, side movable contact is not provided, and having a portion along the curved shape in a state where the movable contact is in contact with the fixed contact.

According to the above configuration, the contact mechanism includes a drive mechanism that drives the contact mechanism, and the contact mechanism includes a fixed contact that extends from an insulating base and a movable contact that is displaced by the drive mechanism. A high-frequency relay that can be used for a plurality of impedances, and the shield member is configured to be in contact with the fixed contact of the movable contact. the gap between the shield member and the movable contact is different it is impedance meaning use different things in height of the coaxial line constituted by the outer conductor of the conductor and the shield member is formed among the movable contact and the fixed contact is formed At the time of assembly, the one that meets the required impedance is alternatively selected and assembled.

In realizing the difference in impedance, the shield member for high impedance is a flat plate having the same distance to the fixed contact between the fixed contact and the non-movable contact side. are formed in the shield member for low impedance, with respect to the fixed contacts, the side where the movable contact is not provided, along the curved shape in a state where the movable contact is in contact with the fixed contact (which follow) moiety to have a.

  Therefore, without changing the terminal pitch of the fixed contact, and thus the insulating base, the casing covered on it, the contact mechanism and the drive mechanism, etc., it can be used for applications with different impedances by simply replacing the shield member. And versatility can be improved. In addition, compared to the method of approaching by a step or the like, by following the curved shape of the movable contact, it is not necessary to unnecessarily reduce the distance from the shield member near the nearest contact (the curved top of the movable contact). The desired impedance can be easily obtained and good isolation can be ensured.

  Further, in the high frequency relay of the present invention, the shield member for high impedance is formed in a flat plate shape having the same distance from the fixed contact on the side where the movable contact is provided and the side where the movable contact is not provided. The shield member for low impedance is characterized in that the side on which the movable contact is provided is formed in the flat plate shape, and the side on which the movable contact is not provided is formed in the curved shape.

  According to the above configuration, the common contact is at the center, and the individual contacts are arranged on both sides of the common contact. The three fixed contacts are arranged on one side, and one movable contact is on one side of the straight line and the other is on the other side. In the case of a high frequency relay in which one movable contact is normally on and the other movable contact is normally off, one movable contact is arranged on the other side and the two movable contacts are driven by a common card. The configuration on the contact side and the configuration on the other movable contact side are point-symmetric with respect to the common contact. Therefore, the shield member, which has been configured substantially symmetrically with respect to the straight line in the related art, can be moved to the movable contact by the curved shape on the side where the movable contact is not provided, and other parts such as the base and the casing can be obtained. There is no need to change any of the components, and the impedance can be reduced. On the other hand, the side on which the movable contact is provided can ensure isolation by setting a conventional spacing.

  Also, if the side opposite to the side where the movable contact is provided is flat, the shield member for low impedance must be close to the movable contact by a step or the like, and near the closest contact (the curved top of the movable contact) The distance between the shield member and the shield member needs to be significantly narrower than that of the curved shape. On the other hand, in the three-contact relay as described above, two movable contacts that operate in a reciprocal manner are mounted on a common card of the drive mechanism. Therefore, when the movable contact is separated from the shield member on one individual contact side, the other individual contact is provided. There is a possibility that the shield member approaches the shield member on the contact side and short-circuits. Therefore, as described above, the curved shape allows the desired impedance to be obtained without approaching the undue distance compared to the flat plate shape having a narrower distance from the shield member in the vicinity of the nearest contact point. The positional accuracy can be relaxed.

  Thus, the present invention can be suitably implemented for the above-described three-contact relay.

  Furthermore, the high frequency relay of the present invention has three fixed contacts in which a common contact is arranged in the center and individual contacts are arranged on both sides thereof, and one movable contact is on one side of the straight line. In the high frequency relay in which the other movable contact is disposed on the other side, the two movable contacts are driven by a common card, one movable contact is normally on, and the other movable contact is normally off. The shield member for low impedance is characterized in that the curved conductive part is further assembled to the common contact portion.

  According to the above configuration, in order to make the shield member follow the curved shape in a state where the movable contact is in contact with the fixed contact, the common contact is arranged in the center, and the individual contacts are arranged on both sides in a straight line. One movable contact is arranged on one side of the straight line, the other movable contact is arranged on the other side, two movable contacts are driven by a common card, and one movable contact is In the case of a high frequency relay in which the other movable contact is normally off, the central common contact is shared by the two reciprocating movable contacts, and one of the movable contacts is provided in the shield member. Even if an attempt is made to bend the side that cannot be bent, the other movable contact is retracted to that portion when it is cut off, making it difficult to follow the curved shape. Therefore, it is possible to more easily obtain a desired impedance by assembling another conductive part to realize the curved shape.

  Further, the high frequency relay of the present invention has three fixed contacts, each having a common contact at the center and individual contacts on both sides thereof, and one movable contact is on one side of the straight line. In the high frequency relay in which the other movable contact is disposed on the other side, the two movable contacts are driven by a common card, one movable contact is normally on, and the other movable contact is normally off. The member is characterized by being divided into two parts symmetrically.

  According to the above configuration, the common contact is at the center, and the individual contacts are arranged on both sides of the common contact. The three fixed contacts are arranged on one side, and one movable contact is on one side of the straight line and the other is on the other side. In the case of a high frequency relay in which one movable contact is normally on and the other movable contact is normally off, one movable contact is arranged on the other side and the two movable contacts are driven by a common card. The configuration on the contact side and the configuration on the other movable contact side are point-symmetric with respect to the central common contact.

  Therefore, by dividing the shield member into two parts symmetrically, the assembly accuracy is deteriorated, but the workability of the part itself is improved, and the dimensional accuracy of the shield member as a whole can be improved.

  Furthermore, the high-frequency relay according to the present invention is configured such that the contact mechanism and the drive mechanism are arranged in parallel with each other, and the drive mechanism is supported by a pair of balanced springs extending from a base and mounted on the card. By moving one of a pair of armatures extending from both poles of the magnets in contact with the iron core of the electromagnet mounted on the base, the movable contact of the contact mechanism is driven to displace and contact / separate from the fixed contact. The high frequency signal is switched.

  According to said structure, the drive mechanism suitable for the contact mechanism of the said structure can be comprised.

  The television tuner of the present invention is characterized by using the above-described high frequency relay.

  Furthermore, the wireless relay device of the present invention is characterized by using the high-frequency relay.

  According to the above configuration, in the high-frequency relay for switching the high-frequency signal, the present high-frequency relay that can adjust the impedance as described above, has high versatility, and easily obtains a desired impedance is used for a television tuner or a wireless relay device. Thus, the present high frequency relay can be shared regardless of the difference in impedance, which is preferable.

As described above, the high-frequency relay according to the present invention is configured such that a drive mechanism for driving the contact mechanism is disposed close to the contact mechanism, and the contact mechanism is displaced by a fixed contact extending from an insulating base and the drive mechanism. In the high-frequency relay that can be used for a plurality of impedances, the fixed contact of the movable contact is fixed to the shield member. Since the gap between the shield member and the movable contact at the time of contact with the conductor is different, the impedance of the coaxial line formed by the inner conductor formed by the movable contact and the fixed contact and the outer conductor formed by the shield member is high and low. leave use meaning different things, during assembly, as assembled alternatively selects by one to meet the required impedance, further , In order to realize the difference in the impedance, the shield member for high impedance, with respect to the fixed contacts, between the side not provided with the side where the movable contact is provided, the flat distance is equal to each other with respect to said fixed contact formed, a shielding member for the low impedance with respect to the fixed contacts, the side on which the movable contact is not provided, the movable contact is closed a curved shape along (modeled by which) part of in contact with the fixed contact .

  Therefore, without changing the terminal pitch of the fixed contact, and thus the insulating base, the casing covering it, the contact mechanism and the drive mechanism, etc., it can be used for applications with different impedances by simply replacing the shield member. And versatility can be improved. In addition, compared to the method of approaching by a step or the like, by following the curved shape of the movable contact, it is not necessary to unnecessarily reduce the distance from the shield member near the nearest contact (the curved top of the movable contact). Thus, it is possible to easily obtain a desired impedance, and it is possible to ensure good isolation.

  Further, as described above, the high-frequency relay of the present invention has three fixed contacts in which a common contact is arranged in the center and individual contacts are arranged on both sides thereof, and one movable contact is the straight line. The other movable contact is disposed on the other side, the two movable contacts are driven by a common card, one movable contact is normally on, and the other movable contact is normally off. In the case of a relay, the configuration on the one movable contact side and the configuration on the other movable contact side are point-symmetric with respect to the common contact, so that the shield is conventionally configured to be substantially line-symmetric with respect to the straight line. Only the side where the movable contact is not provided is brought close to the movable contact by the curved shape, and the member is lowered in impedance. Also, if the side opposite to the side where the movable contact is provided is flat, the shield member for low impedance must be close to the movable contact by a step or the like, and near the closest contact (the curved top of the movable contact) The distance between the shield member and the shield member needs to be significantly narrower than in the case of the curved shape. In the curved shape, a desired impedance can be obtained without approaching the undue force. The positional accuracy can be relaxed.

  Therefore, the present invention can be suitably implemented in the above-described three-contact relay.

  Furthermore, as described above, the high frequency relay of the present invention has a common contact at the center and individual contacts on both sides of the shield member along the curved shape with the movable contact contacting the fixed contact. It has three fixed contacts arranged on a straight line, one movable contact is arranged on one side of the straight line, the other movable contact is arranged on the other side, and two movable contacts are driven by a common card In the case of a high frequency relay in which one movable contact is normally on and the other movable contact is normally off, the central common contact is shared by two reciprocating movable contacts. Even if an attempt is made to bend the side where the movable contact is not provided, the other movable contact will be retracted at the time of interruption to follow the curved shape. It becomes difficult.

  Therefore, the desired impedance can be more easily obtained by assembling another conductive part to realize the curved shape.

  Further, as described above, the high-frequency relay of the present invention has three fixed contacts in which a common contact is arranged in the center and individual contacts are arranged on both sides thereof, and one movable contact is the straight line. The other movable contact is disposed on the other side, the two movable contacts are driven by a common card, one movable contact is normally on, and the other movable contact is normally off. In the case of a relay, the configuration on one movable contact side and the configuration on the other movable contact side are point-symmetric with respect to the central common contact, so that the shield member is symmetrically divided into two parts.

  Therefore, although the assembly accuracy is deteriorated, the workability of the component itself is improved, and the dimensional accuracy of the entire shield member can be improved.

  Furthermore, as described above, the high-frequency relay of the present invention includes the contact mechanism and the drive mechanism arranged in parallel with each other, and the drive mechanism is supported by a pair of balanced springs extending from a base. Any one of a pair of armatures extending from both poles of the magnet mounted on the card contacts the iron core of the electromagnet mounted on the base, thereby displacing and driving the movable contact of the contact mechanism and contacting the fixed contact. / High frequency signal is switched by separating.

  Therefore, a drive mechanism suitable for the contact mechanism having the above-described structure can be configured.

  Further, as described above, the television tuner and the wireless relay device of the present invention are high-frequency relays that switch high-frequency signals as described above, the impedance adjustment as described above is highly versatile, and it is easy to obtain a desired impedance. A high frequency relay is used for a television tuner or a wireless relay device.

  Therefore, the present high frequency relay can be shared regardless of the difference in impedance, which is preferable.

[Embodiment 1]
FIG. 1 is an exploded perspective view showing the overall structure of a high-frequency relay 1 according to an embodiment of the present invention. The high-frequency relay 1 is generally configured by arranging a contact mechanism 11 in parallel with a drive mechanism 21 that drives the contact mechanism 11.

  The contact mechanism 11 is provided with movable contacts 13 and 14 in a shield box 12, and the movable contacts 13 and 14 are driven to be displaced in the reference sign X direction by the drive mechanism 21, whereby fixed contacts 15 and 16; The reciprocal operation which contacts / separates 16 and 17 is performed, and the high frequency signal is switched. Therefore, the movable contacts 13 and 14 constitute a coaxial line having a central conductor and the shield box 12 being an external conductor.

  It should be noted that in the present embodiment, the shield box 12 is a 75Ω high impedance shield box 12-1 shown enlarged in FIG. 2, and a 50Ω low impedance low impedance shown in FIG. The shield box 12-2 is alternatively used for a television tuner and a wireless relay device, respectively. 2 (a) and 3 (a) are exploded perspective views of the shield boxes 12-1 and 12-2 alone, and FIGS. 2 (b) and 3 (b) show the shield boxes 12-1, 12-2. 12-2 is an exploded perspective view in a state in which the fixed contacts 15, 16, 17 and the movable contacts 13, 14 are arranged in 12-2. FIGS. 2 (c) and 3 (c) are FIGS. 2 (b) and 3; It is a top view of (b). FIG. 4 is a development view of a shield box 12-2 for low impedance of 50Ω.

  The movable contacts 13 and 14 are respectively held by drive members 18 and 19 that are displaced and driven by the drive mechanism 21. The fixed contacts 15, 16, and 17 are loosely inserted into the openings 12h, 12i, and 12j formed at the bottoms of the shield boxes 12-1 and 12-2, respectively, in the shield boxes 12-1 and 12-2. It is electrically insulated and erected on a straight line, and the side opposite to the movable contacts 13 and 14 protrudes from the back surface of the base 20 to become terminals P1, P2 and P3.

  As shown in FIGS. 2C and 3C, the central fixed contact 16 (terminal P2) is a common contact that can come into contact with both the movable contacts 13 and 14. On the other hand, the fixed contacts 15 and 17 (terminals P1 and P3) at both ends are individual contacts that can contact only the movable contacts 13 and 14, respectively. In the example of FIGS. 2C and 3C, the fixed contact 17 becomes a normally-on contact that is connected to the fixed contact 16 by the movable contact 13 when the drive mechanism 21 is not driven. Is a normally-off contact in which the movable contact 14 is separated from the fixed contact 16 when the drive mechanism 21 is not driven.

  The shield boxes 12-1 and 12-2 are connected to the ground with the movable contacts 13 and 14 when they are separated from the fixed contacts 15, 16, and 17 at both ends and the center position in the longitudinal direction. Fixed contacts 12a, 12b and 12c are provided, and a ground terminal 12d is provided between the terminals P1, P2 and P3 of the fixed contacts 15, 16, and 17. In addition, the shield boxes 12-1 and 12-2 are preferably formed as large as possible without gaps in order to accommodate the movable contacts 13 and 14 as described above. In order to avoid the interference, a notch 12e is formed.

  The drive mechanism 21 includes an electromagnet 22 and a displacement member 23. In the electromagnet 22, the iron core 26 is inserted into the bobbin 25 around which the coil 24 is wound, and a magnetic path is provided by the yoke 27 between one end portion 26 a and the other end portion 26 b of the iron core 26. Formed and configured. Each end of the coil 24 is connected to terminals 28 and 29 to which excitation current is applied from the outside.

  On the other hand, the displacement member 23 contacts the card 31 that supports the movable contacts 13 and 14 via the drive members 18 and 19, the magnet 32 provided at one end of the card 31, and both ends of the magnet 32. A pair of armatures 33 and 34 sandwiching one end portion 26a of the iron core 26, a pair of balance springs 35 and 36 extending from the other end of the card 31, and the other end of the balance springs 35 and 36 are connected to the base. A balance spring holding plate 37 attached to the base 20 is provided. Accordingly, when the electromagnet 22 is demagnetized / excited, the balance springs 35 and 36 of the card 31 are deformed and displaced in the X direction, and the movable contacts 13 and 14 can be driven to displace. By using the drive mechanism 21 having such a structure, a drive mechanism suitable for the contact mechanism 11 having the above structure can be configured.

  The fixed contact 15, 16, 17, the shield box 12 (12-1, 12-2), and the electromagnet 22 are accommodated in the base 20, and the displacement member 23 is mounted on the electromagnet 22, and then the resin casing 38 is put on.

  In the high-frequency relay 1 configured as described above, it should be noted that in the 75Ω high impedance shield box 12-1 shown enlarged in FIG. 2, the side wall 41 surrounding the fixed contacts 15, 16, and 17 is used. ˜46 are formed in a flat plate shape having the same distance to the fixed contacts 15, 16, 17 on the side where the movable contacts 13, 14 are provided and the side where the movable contacts 13, 14 are not provided with respect to the fixed contacts 15, 16, 17, respectively. In contrast, in the shield box 12-2 for low impedance of 50Ω shown in an enlarged manner in FIG. 3, the movable contacts 13 and 14 are not provided on the fixed contacts 15, 16, and 17 side. Side walls 47, 48 are formed so as to follow (follow) the curved shape in a state where the movable contacts 13, 14 are in contact with the fixed contacts 15, 16, 17. The distance (gap) is shortened. In the shield box 12-2, the side walls 43 and 44 on the side where the movable contacts 13 and 14 are provided are formed in a flat plate shape at the same conventional distance (interval) as the shield box 12-1. Can be secured.

  That is, as described above, the common contact 16 is provided at the center, and the individual contacts 15 and 17 are provided on both sides of the common contact 15 and 17, respectively. The other movable contact 14 is disposed on the other L2 side on the one L1 side of the straight line, the two movable contacts 13 and 14 are driven by a common card 31, the one movable contact 14 is normally on, and the other In the case of the contact mechanism 11 in which the movable contact 13 is normally off, the configuration on the one movable contact 13 side and the configuration on the other movable contact 14 side are point-symmetric about the common contact 16. Therefore, the shield box 12-1 for high impedance of 75Ω as shown in FIG. 2 is configured to be substantially line symmetric with respect to the straight line L as in the prior art, whereas it is 50Ω as shown in FIG. In the shield box 12-2 for low impedance, the side walls 47 and 48 on the side where the movable contacts 13 and 14 are not provided are brought close to the movable contacts 13 and 14 due to the curved shape.

  5 to 7 are graphs showing the experiment results of the present inventor, and represent insertion loss and VSWR (Voltage Standing Wave Ratio: reflection coefficient). FIG. 5 shows a case where a 75Ω high impedance shield box 12-1 is used in a 75Ω system, that is, a high-frequency relay having an appropriate impedance is inserted, and FIG. 6 shows a 75Ω high impedance shield in a 50Ω system. FIG. 7 shows a case where a box 12-1 is used, that is, a high-frequency relay having an improper impedance is inserted, and FIG. 7 shows a case where a 50Ω low-impedance shield box 12-2 is used in a 50Ω system. The case where a high frequency relay is inserted is shown.

  As is clear from comparison of FIGS. 5 to 7, by using a high-frequency relay having an appropriate impedance, insertion loss and reflection are reduced, and the characteristic of 75Ω shown in FIG. It can be seen that the 50Ω characteristic shown is comparable.

  By configuring in this way, the terminal pitch of the fixed contacts 15, 16, 17 and thus the insulating base 20, the resin casing 38 covering the insulating base 20, the contact mechanism 11, the drive mechanism 21 and the like are not changed. By simply using the shield members 12-1 and 12-2 alternatively, the shield members 12-1 and 12-2 can be adapted to different uses of impedance, and versatility can be improved.

  Further, compared to the method of approaching by the step or folding of Patent Document 1, the curved contact of the movable contacts 13 and 14 is followed, so that the closest contact (the curved top of the movable contact = the driving members 18 and 19). There is no need to unnecessarily reduce the distance from the shield member 12-2 in the vicinity, and a desired impedance can be easily obtained. In particular, in the case of the high-frequency relay 1 having such three fixed contacts 15, 16, and 17, and the two movable contacts 13 and 14 are operated reciprocally by a common card 31, the movable contacts 13 and 14 are one individual contact. For example, if the shield member 12-1, 12-2 is separated from the shield member 12-1, 12-2 on the 15th side, it approaches the shield member 12-1, 12-2 on the other individual contact, that is, the 17 side. In the curved shape that can widen the interval in the vicinity of the nearest contact point, the possibility of short-circuiting is small, the positional accuracy of the movable contacts 13, 14 and therefore the drive mechanism 21 can be relaxed, and the uniform distance is good. Isolation can be ensured, and the present invention can be suitably implemented.

  When the contact mechanism 11 has a sufficient space, the gap is larger than that of the low impedance shield member 12-2 and is curved as compared to the flat shield member 12-1. Although a large space is required, the high impedance shield member 12-1 may have the curved shape in order to easily obtain a desired impedance as described above. Further, when the movable contacts 13 and 14 of the shield members 12-1 and 12-2 are in contact with the movable contacts 13 and 14 when they are separated from the fixed contacts 15, 16, and 17, the ground contact is also provided. It may be curved to such an extent that it is not impaired.

  FIG. 8 is a perspective view showing the high-frequency switching device 51 configured using the high-frequency relay 1 configured as described above with the top cover removed. The high-frequency switching device 51 includes the high-frequency relay 1 and the printed circuit board 54 in a metal casing 52, and high-frequency connectors 55, 56, and 57 are attached to the metal casing 52, and is mounted on a television tuner. Thus, it is used for switching between a terrestrial television broadcast signal and a cable television signal. The printed circuit board 54 is provided with an amplifier, an element for impedance matching, and the like as necessary.

  In the example of FIG. 8, the high frequency connectors 55 and 56 are F type connectors, the high frequency connector 57 is a pin type connector, and the central conductors of the high frequency connectors 55 and 56 are the fixed contacts 15 and 17 (terminals) of the high frequency relay 1. P1 and P3), and the center conductor of the high frequency connector 57 is connected to the fixed contact 16 (terminal P2) of the high frequency relay 1. Therefore, an input signal from either one of the high frequency connectors 55 and 56 is selected by the high frequency relay 1 and output to the high frequency connector 57, or an input signal from the high frequency connector 57 is output by the high frequency relay 1. The data is output to any one of 56.

  On the other hand, in the wireless relay device, the transmission signal is branched into a plurality of paths, amplified by an amplifier provided in each path, mixed, and input to an antenna. It is used in the mixing part and to make it possible to disconnect the amplifier that fails or performs maintenance. Alternatively, it is used to perform stub switching for preventing the impedance of the transmission line from changing due to the disconnection.

  Regardless of the difference in impedance, the present high frequency relay 1 can be shared by simply using the shield members 12-1 and 12-2 in such a television tuner or wireless relay device. Is preferable.

[Embodiment 2]
FIG. 9 is a view showing the structure of a shield box 52 in a high-frequency relay according to another embodiment of the present invention, FIG. 9 (a) is a perspective view, and FIG. 9 (b) is a plan view of the contact mechanism 11. It is. The shield box 62 is similar to the shield box 12-2 described above, and corresponding portions are denoted by the same reference numerals, and description thereof is omitted. It should be noted that in the shield box 62, in the configuration of the shield box 12-2 described above, a curved conductive part 63 is further assembled at the common contact 16 portion.

  Therefore, in order to make the shield member 62 conform to the curved shape in a state where the movable contacts 13 and 14 are in contact with the fixed contacts 15, 16 and 17, the three fixed contacts 15, 16 and 17 are provided as described above. In the case of the contact mechanism 11 having two movable contacts 13 and 14 sandwiched between them and driven by a common card 31, the shield box 12-2 shown in FIG. On the other hand, although the side walls 47 and 48 corresponding to the individual contacts 15 and 17 side, that is, the outer half of the drive members 18 and 19 are formed in a curved shape, the common contact 16 side, that is, the inner side. The side walls 42 and 45 corresponding to the half of the other side are retracted when the other movable contacts 14 and 13 are cut off, and are formed in a flat plate shape like the shield box 12-1 for high impedance. Whereas the, by realizing the curved shape by assembling the conductive parts 63 separately, impedance and desired become more easy to obtain.

[Embodiment 3]
FIG. 10 is a view showing the structure of a shield box 72 in a high-frequency relay according to still another embodiment of the present invention, FIG. 9 (a) is a perspective view, and FIG. 9 (b) is a plan view of the contact mechanism 11. FIG. The shield box 72 is similar to the shield box 12-2 described above, and corresponding portions are denoted by the same reference numerals, and description thereof is omitted. It should be noted that the shield box 72 has the three fixed contacts 15, 16, and 17 as described above, and the two movable contacts 13 and 14 are provided between them and driven by the common card 31. In the case of the contact mechanism 11, the configuration on the one movable contact 13 side and the configuration on the other movable contact 14 side are symmetrical with respect to the central common contact 16, so that the two parts 72-1 are symmetrically arranged. , 72-2.

  Therefore, although the assembly accuracy is deteriorated, the workability of the component itself is improved, and the dimensional accuracy of the shield member 72 as a whole can be improved.

It is a disassembled perspective view which shows the whole high frequency relay structure concerning one Embodiment of this invention. It is a figure which expands and shows the shield box for high impedances in the high frequency relay shown in FIG. It is a figure which expands and shows the shield box for low impedance in the high frequency relay shown in FIG. It is an expanded view of the shield box shown in FIG. It is a graph which shows the experiment result of this inventor, and shows the insertion loss and VSWR at the time of using the 75 ohm high impedance shield box for a 75 ohm system. It is a graph which shows the experimental result of this inventor, and represents the insertion loss and VSWR at the time of using the 75 ohm high impedance shield box for a 50 ohm system. It is a graph which shows the experimental result of this inventor, and represents insertion loss and VSWR when a 50Ω low impedance shield box is used in a 50Ω system. It is a perspective view which removes the upper cover of the high frequency switching apparatus carrying the high frequency relay shown in FIGS. It is a figure which shows the structure of the shield box in the high frequency relay which concerns on the other embodiment of this invention. It is a figure which shows the structure of the shield box in the high frequency relay which concerns on other form of implementation of this invention.

Explanation of symbols

1 High frequency relay 11 Contact mechanism 12, 12-1, 12-2, 62, 72 Shield box 12a, 12b, 12c Fixed contact 12d Ground terminal 12e Notch 13, 14 Movable contact 15, 16, 17 Fixed contact 18, 19 Drive Member 20 base 21 drive mechanism 22 electromagnet 23 displacement member 24 coil 25 bobbin 26 iron core 27 yoke 31 card 32 magnets 33, 34 armatures 35, 36 balanced springs 41, 42, 43, 44, 45, 46, 47, 48 Side wall 51 High frequency switching device 52 Metal housing 54 Printed circuit board 55, 56, 57 High frequency connector 63 Conductive parts 72-1, 72-2 Ports P1, P2, P3

Claims (6)

A drive mechanism for driving the contact mechanism is disposed adjacent to the contact mechanism, and the contact mechanism includes a fixed contact extending from an insulating base and a plate-like movable contact that is displaced and driven by the drive mechanism. In the high-frequency relay that can be used for a plurality of impedances, the fixed contact and the movable contact are housed inside the shield member.
The high-frequency relay can be used for the plurality of impedances by selectively using the shield member for high impedance and low impedance,
The shield member for high impedance is formed in a flat plate shape in which the distance to the fixed contact is equal to the fixed contact on the side where the movable contact is provided and the side where the movable contact is not provided.
The shield member for low impedance is formed in the flat plate shape on the side where the movable contact is provided, and the side where the movable contact is not provided is a portion along the curved shape in a state where the movable contact is in contact with the fixed contact. A high-frequency relay comprising: There are three fixed contacts with a common contact at the center and individual contacts on both sides of the common contact. One movable contact is on one side of the straight line and the other movable contact is on the other side. arranged, two movable contacts are driven by a common card, one movable contact is normally-on, the high frequency relay according to claim 1 Symbol placing the other of the movable contact is normally off,
The high-frequency relay according to claim 1, wherein the shield member for low impedance further has the curved conductive part assembled at a common contact portion. There are three fixed contacts with a common contact at the center and individual contacts on both sides of the common contact. One movable contact is on one side of the straight line and the other movable contact is on the other side. arranged, two movable contacts are driven by a common card, one movable contact is normally-on, the high frequency relay according to claim 1 Symbol placing the other of the movable contact is normally off,
The high frequency relay according to claim 1, wherein the shield member is symmetrically divided into two parts. The contact mechanism and the drive mechanism are arranged in parallel with each other, and the drive mechanism includes a pair of contacts extending from both poles of a magnet mounted on the card, with the card supported by a pair of balanced springs extending from a base. A high-frequency signal is switched by driving a displacement contact of the contact mechanism by contacting one of the poles with an iron core of an electromagnet mounted on the base, and contacting / separating from a fixed contact. The high frequency relay according to any one of claims 1 to 3 . The television tuner using the high frequency relay of any one of the said Claims 1-4 . A radio relay apparatus using the high-frequency relay according to any one of claims 1 to 4 .

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