CONNECTION SWITCHING DEVICE

Abstract

A connection switching device is provided which connects a plug, having a plug pin connected to an inspecting circuit, to a receptacle connector connecting an antenna and a transmission/reception circuit, and switches a connection to a parallel connection where the inspection circuit is connected to the antenna and to the transmission/reception circuit. The receptacle connector includes a first contact, a second contact, and a normally closed terminal that is brought into elastic contact with the first contact and the second contact. The plug includes a first plug pin being brought into contact with the first contact, a second plug pin being brought into contact with the second contact, and an insulating projection being inserted between at least one of the first and second contacts and the normally closed terminal to insulate between the at least one of the first and second contacts and the normally closed terminal.

Claims

1. A connection switching device configured to connect a plug having a first plug pin to a receptacle connector, the receptacle connector having a first contact and a second contact that are attached to an insulating housing, the connection switching device being configured to switch an electrical connection between the first contact and the second contact to an electrical connection between the first contact and the first plug pin, wherein the receptacle connector includes: the first contact having a first elastic contact piece; the second contact having a second elastic contact piece; and a normally closed terminal that is attached between the first contact and the second contact of the insulating housing, the normally closed terminal being brought into elastic contact with the first elastic contact piece and the second elastic contact piece, the plug includes: the first plug pin; a second plug pin, and an insulating projection, the first plug pin being brought into contact with the first contact, the second plug pin being brought into contact with the second contact, and the insulating projection being inserted between the first elastic contact piece and the normally closed terminal and/or between the second elastic contact piece and the normally closed terminal to insulate between the first elastic contact piece and/or the second elastic contact piece and the normally closed terminal, when the plug is electrically connected to the receptacle connector, and when the receptacle connector and the plug are connected to each other, the first contact and the first plug pin are electrically connected to each other, and the second contact and the second plug pin are electrically connected to each other.

2. The connection switching device according to claim 1, wherein the plug includes: the first plug pin that is brought into contact with the first contact; the second plug pin that is brought into contact with the second contact; the insulating projection that is inserted between the first elastic contact piece and the normally closed terminal and between the second elastic contact piece and the normally closed terminal to insulate between the first elastic contact piece and the normally closed terminal and between the second elastic contact piece and the normally closed terminal; and a ground terminal that is connected to a ground, the ground terminal being projected along the insulating projection, and when the plug is connected to the receptacle connector, the ground terminal is brought into contact with the normally closed terminal.

3. The connection switching device according to claim 1, wherein the first contact is connected to a transmission/reception circuit that transmits and/or receives an antenna signal, the second contact is connected to a feeding point of the antenna, and the first plug pin and the second plug pin are probes that are connected to a detection circuit that detects an RF signal flowing to the transmission/reception circuit or to the antenna.

4. The connection switching device according to claim 1, wherein the first contact and the second contact are identical in shape.

5. The connection switching device according to claim 4, wherein the first contact and the second contact are attached to the insulating housing at positions point-symmetric with respect to the normally closed terminal.

6. The connection switching device according to claim 5, wherein a first plate electrode portion is integrally formed on a side of the first elastic contact piece of the first contact, the first plate electrode portion being brought into contact with the first plug pin of the plug, and a second plate electrode portion is integrally formed on a side of the second elastic contact piece of the second contact, the second plate electrode portion being brought into contact with the second plug pin of the plug.

7. A connection switching device configured to connect a plug having a first plug pin to a receptacle connector, the receptacle connector having a first contact and a second contact that are attached to an insulating housing, the connection switching device being configured to switch an electrical connection between the first contact and the second contact to an electrical connection between the first contact and the first plug pin, wherein the receptacle connector includes: the first contact having a first elastic contact piece; the second contact having a second elastic contact piece; and a normally closed terminal that is attached between the first contact and the second contact in the insulating housing, the normally closed terminal being brought into elastic contact with the first elastic contact piece and the second elastic contact piece, the plug includes: the first plug pin; and a second plug pin, the first plug pin being brought into contact with the first elastic contact piece to separate the first elastic contact piece from the normally closed terminal, the second plug pin being brought into contact with the second elastic contact piece to separate the second elastic contact piece from the normally closed terminal, when the plug is connected to the receptacle connector, and when the receptacle connector and the plug are connected to each other, the first contact and the first plug pin are electrically connected to each other, and the second contact and the second plug pin are electrically connected to each other.

8. The connection switching device according to claim 7, wherein the plug includes: the first plug pin; the second plug pin that is brought into contact with the second elastic contact piece to separate the second elastic contact piece from the normally closed terminal; and a ground terminal that is connected to a ground, and when the plug is connected to the receptacle connector, the ground terminal is brought into contact with the normally closed terminal.

9. The connection switching device according to claim 7, wherein the first contact is connected to a transmission/reception circuit that transmits and/or receives an antenna signal, the second contact is connected to a feeding point of the antenna, and the first plug pin and the second plug pin are probes that are connected to a detection circuit that detects an RF signal flowing to the transmission/reception circuit or to the antenna.

10. The connection switching device according to claim 2, wherein the first contact is connected to a transmission/reception circuit that transmits and/or receives an antenna signal, the second contact is connected to a feeding point of the antenna, and the first plug pin and the second plug pin are probes that are connected to a detection circuit that detects an RF signal flowing to the transmission/reception circuit or to the antenna.

11. The connection switching device according to claim 2, wherein the first contact and the second contact are identical in shape.

12. The connection switching device according to claim 3, wherein the first contact and the second contact are identical in shape.

13. The connection switching device according to claim 10, wherein the first contact and the second contact are identical in shape.

14. The connection switching device according to claim 11, wherein the first contact and the second contact are attached to the insulating housing at positions point-symmetric with respect to the normally closed terminal.

15. The connection switching device according to claim 12, wherein the first contact and the second contact are attached to the insulating housing at positions point-symmetric with respect to the normally closed terminal.

16. The connection switching device according to claim 13, wherein the first contact and the second contact are attached to the insulating housing at positions point-symmetric with respect to the normally closed terminal.

17. The connection switching device according to claim 14, wherein a first plate electrode portion is integrally formed on a side of the first elastic contact piece of the first contact, the first plate electrode portion being brought into contact with the first plug pin of the plug, and a second plate electrode portion is integrally formed on a side of the second elastic contact piece of the second contact, the second plate electrode portion being brought into contact with the second plug pin of the plug.

18. The connection switching device according to claim 15, wherein a first plate electrode portion is integrally formed on a side of the first elastic contact piece of the first contact, the first plate electrode portion being brought into contact with the first plug pin of the plug, and a second plate electrode portion is integrally formed on a side of the second elastic contact piece of the second contact, the second plate electrode portion being brought into contact with the second plug pin of the plug.

19. The connection switching device according to claim 16, wherein a first plate electrode portion is integrally formed on a side of the first elastic contact piece of the first contact, the first plate electrode portion being brought into contact with the first plug pin of the plug, and a second plate electrode portion is integrally formed on a side of the second elastic contact piece of the second contact, the second plate electrode portion being brought into contact with the second plug pin of the plug.

20. The connection switching device according to claim 8, wherein the first contact is connected to a transmission/reception circuit that transmits and/or receives an antenna signal, the second contact is connected to a feeding point of the antenna, and the first plug pin and the second plug pin are probes that are connected to a detection circuit that detects an RF signal flowing to the transmission/reception circuit or to the antenna.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0051] FIG. 1 is a perspective view showing a receptacle connector 10 of a connection switching device 1 according to the present invention.

[0052] FIG. 2 is a plan view of the receptacle connector 10.

[0053] FIG. 3 is an exploded perspective view of the receptacle connector 10.

[0054] FIG. 4 is a cross-sectional view of the receptacle connector 10 of FIG. 2 taken along line A-A.

[0055] FIG. 5 is a cross-sectional view of the receptacle connector 10 of FIG. 2 taken along line B-B.

[0056] FIG. 6 is a cross-sectional view of the receptacle connector 10 of FIG. 2 taken along C-C line.

[0057] FIG. 7 is a vertical cross-sectional view of the receptacle connector 10 shown in FIG. 6 in the state of being connected to a plug 20.

[0058] FIG. 8 is a circuit diagram of the receptacle connector 10 in a normal state where the plug 20 is not connected.

[0059] FIG. 9 is a circuit diagram of the receptacle connector 10 in the state of being connected to the plug 20.

[0060] FIG. 10 is a vertical cross-sectional view showing a receptacle connector 31 before a plug 40 is connected in a connection switching device 30 according to a second embodiment.

[0061] FIG. 11 is a vertical cross-sectional view showing the receptacle connector 31 in the state of being connected to the plug 20.

[0062] FIG. 12 is a vertical cross-sectional view showing a conventional connection switching device 100 in the state where a plug 110 is connected to a receptacle connector 101.

[0063] FIG. 13 is a vertical cross-sectional view of a coaxial connector with a switch 121 of a conventional connection switching device 120.

DESCRIPTION OF EMBODIMENTS

[0064] Hereinafter, a connection switching device 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 through 9. As shown in the circuit diagram of FIG. 9, the connection switching device 1 of the embodiment is configured to establish a connection by switching between a normal connection between a feeding point 2a of an antenna 2 and a transmission/reception circuit 3 that transmits or receives an antenna signal through or from the antenna 2, and a two-way connection in which an inspecting circuit 4 having a detection circuit that detects an RF signal flowing to the antenna 2 or to the transmission/reception circuit 3 is connected to the feeding point 2a of the antenna 2 and the transmission/reception circuit 3 in parallel. The connection switching device 1 includes a receptacle connector with a switch 10 (hereinafter simply referred to as receptacle connector 10) including a first contact 11 that is a first common terminal connected to the transmission/reception circuit 3, a second contact 12 that is a second common terminal connected to the feeding point 2a of the antenna 2, and a normally closed terminal 13, the terminals being attached to an insulating housing 14 in the state of being insulated from each other. The connection switching device 1 also includes a plug 20 that is fitted and connected to the receptacle connector 10. The receptacle connector 10 is mounted on the surface of a circuit board of an electronic communication apparatus which is not illustrated, the circuit board being mounted with the antenna 2 and the transmission/reception circuit 3.

[0065] The insulating housing 14 of the receptacle connector 10 is formed into a square tube with a through hole 15 extending in a vertical direction (up-down direction in FIGS. 4 and 5). The entire insulating housing 14 has a symmetrical shape with respect to a vertical line extending through the center of the plan view. The normally closed terminal 13 is formed with a conductive metal plate into the shape of a plate as shown in FIGS. 3 through 5. The normally closed terminal 13 is press-fitted from the lower side of the insulating housing 14 into the insulating housing 14 along a space between inner wall surfaces that face each other at the center of the through hole 15, and fixed to the insulating housing 14. As the normally closed terminal 13 is press-fitted and fixed to the insulating housing 14, the through hole 15 is divided into a first plug insertion hole 15a that allows insertion and removal of a later-described first insulating projection plate 24a of the plug 20 and a second plug insertion hole 15b that allows insertion and removal of a second insulating projection plate 24b.

[0066] As shown in FIG. 3, the first contact 11 is insert-molded in the insulating housing 14, so that a fixed piece 11a integrally fixed to the insulating housing 14, and a first elastic contact piece 11b and a first fixed contact piece 11c bifurcated from the upper side of the fixed piece 11a are integrally formed by press-molding of a long plate-like conductive metal plate. The fixed piece 11a has one lower side that is exposed along the bottom face of the insulating housing 14 and that is solder-connected onto the pattern of a circuit board that is connected to the transmission/reception circuit 3.

[0067] The first elastic contact piece 11b that is one of the bifurcated pieces is an elastic piece supported in a cantilever manner by the fixing piece 11a that is fixed to the insulating housing 14 such that the first elastic contact piece 11b can move in the first plug insertion hole 15a. The first elastic contact piece 11b is folded in a dogleg shape toward the normally closed terminal 13 that is exposed to the first plug insertion hole 15a, and is brought into elastic contact with a side face of the normally closed terminal 13 in a free state as shown in FIG. 6. The first fixed contact piece 11c that is the other bifurcated piece has a first plate electrode portion 11d formed by folding an upper portion of the first fixed contact piece 11c at right angles along the flat surface of the insulating housing 14. The first plate electrode portion 11d is exposed to the flat surface on the side of the first plug insertion hole 15a, and the first plug pin 21 comes into contact with the first plate electrode portion 11d.

[0068] The second contact 12 is identical to the first contact 11 that is formed by press-molding of a long plate-like conductive metal plate. The second contact 12 is provided when it is attached to the insulating housing 14 at a position that is symmetric with the first contact 11 with respect to the vertical line extending through the center of the plan view.

[0069] That is, the fixed piece 11a, the first elastic contact piece 11b, and the first fixed contact piece 11c of the first contact 11 correspond to the fixed piece 12a, the second elastic contact piece 12b, and the second fixed contact piece 12c of the second contact 12, respectively. A portion of the fixed piece 12a exposed along the bottom face of the insulating housing 14 is solder-connected to the pattern of the circuit board connected to the feeding point 2a of the antenna 2. The second elastic contact piece 12b is folded in a dogleg shape toward the normally closed terminal 13 inside the second plug insertion hole 15b, and is brought into elastic contact with the side face of the normally closed terminal 13 in a free state as shown in FIG. 6. The second plate electrode portion 12d folded at right angles along the flat surface of the insulating housing 14 on the upper side of the second fixed contact piece 12c is exposed to the flat surface on the side of the second plug insertion hole 15b at the position diagonal to the first plate electrode portion 11d. The second plug pin 22 comes into contact with the second plate electrode portion 12d.

[0070] As shown in FIG. 3, the receptacle connector 10 further includes an earth shell 16 that surrounds the entire side face of the cubic tube-shaped insulating housing 14. The earth shell 16 is formed into the shape of a rectangular frame shown in the drawing by bending a conductive metal plate. The earth shell 16 has a lower end solder-connected to a ground pattern of the circuit board on which the receptacle connector 10 is mounted. As a consequence, the first contact 11 and the second contact 12 which are disposed in the inner side of the insulating housing 14 are shielded. A ring recess portion 16a is recessed on the circumference of the earth shell 16. When the plug 20 is connected to the receptacle connector 10, a later-described cylindrical ground fitting 26 of the plug 20 is fitted onto the outside of the ring recess portion 16a.

[0071] As shown in FIG. 7, the plug 20 that is fitted and connected to the receptacle connector 10 has an insulating projection 24 projected therefrom. The insulating projection 24 is made of a pair of the first insulating projection plate 24a and the second insulating projection plate 24b which are inserted, from an insulator 27 that supports the first plug pin 21 and the second plug pin 22, along the side face of the normally closed terminal 13 inside the first plug insertion hole 15a and the second plug insertion hole 15b, respectively. As shown in FIG. 7, when the plug 20 is fitted and connected to the receptacle connector 10, the first insulating projection plate 24a is interposed between the normally closed terminal 13 and the first elastic contact piece 11b, and the second insulating projection plate 24b is interposed between the normally closed terminal 13 and the second elastic contact piece 12b, so that the first contact 11 and the second contact 12 that was electrically connected through the normally closed terminal 13 are insulated from each other.

[0072] The first plug pin 21 and the second plug pin 22, which are probes that are connected to the inspecting circuit 4 in parallel, are freely retractably positioned at diagonal positions on the insulator 27, the positions being point-symmetric with respect to the insulating projection 24. Both the first plug pin 21 and the second plug pin 22 are biased in a distal end direction (downward in the drawing) by compression springs 28a and 28b so as to project by a prescribed length from the insulator 27.

[0073] The cylindrical ground fitting 26, made of a cylindrical conductive metal plate that is fitted to the outside of the earth shell 16, is attached to the peripheral surface of the insulator 27. The cylindrical ground fitting 26 is fitted and connected to the ring recess portion 16a of the earth shell 16, so that the plug 20 and the receptacle connector 10 are held in the fitted and connected state.

[0074] Between the first insulating projection plate 24a and the second insulating projection plate 24b, a plate-like ground terminal 25 biased toward the distal end by the compression spring 28c is slidably disposed. The ground terminal 25 is connected to the cylindrical ground fitting 26 that is connected to the ground. As shown in FIG. 9, when the plug 20 is fitted and connected to the receptacle connector 10, the ground terminal 25 is brought into elastic contact with the top face (flat surface) of the normally closed terminal 13, and the potential of the normally closed terminal 13 is changed to the ground potential. The plug 20 does not necessarily need to include the cylindrical ground fitting 26. The ground terminal 25 may be connected to a portion having the ground potential other than the cylindrical ground fitting 26, and thereby change the potential of the normally closed terminal 13 to the ground potential.

[0075] As shown in FIGS. 6 and 8, in the normal state where the plug 20 is not connected to the thus-configured receptacle connector 10, the first elastic contact piece 11b of the first contact 11 and the second elastic contact piece 12b of the second contact 12 are in elastic contact with the side surfaces of the normally closed terminal 13, respectively. As a result, the transmission/reception circuit 3 is connected to the feeding point 2a of the antenna 2, and transmits or receives an antenna signal through or from the antenna 2.

[0076] In the case of inspecting the transmitting and receiving state of the antenna 2 and the operation of the transmission/reception circuit 3, the plug 20 that is connected to the inspecting circuit 4 is connected to the receptacle connector 10. When the plug 20 is fitted and connected to the receptacle connector 10 as shown in FIGS. 7 and 9, the first insulating projection plate 24a is interposed between the normally closed terminal 13 and the first elastic contact piece 11b, and the second insulating projection plate 24b is interposed between the normally closed terminal 13 and the second elastic contact piece 12b, so that the first contact 11 is insulated from the second contact 12. At the same time, the first plug pin 21 and the second plug pin 22 are brought into elastic contact with the first plate electrode portion 11d and the second plate electrode portion 12d which are exposed at opposed positions. As a result, the connection is switch to a two-way connection composed of a connection between the inspecting circuit 4 and the transmission/reception circuit 3, and a connection between the inspecting circuit 4 and the antenna 2.

[0077] When the cylindrical ground fitting 26 that is connected to the ground is fitted and connected to the ring recess portion 16a of the earth shell 16 through the inspecting circuit 4, a signal line connecting the first contact 11 and the first plug pin 21, and a signal line connecting the second contact 12 and the second plug pin 22 are surrounded with the grounded earth shell 16 and the cylindrical ground fitting 26, so that the signal lines are shielded from the outside. At the same time, the signal line connecting the first plug pin 21 and the first contact 11 and the signal line connecting the second plug pin 22 and the second contact 12 are shielded by the ground terminal 25 being grounded and the normally closed terminal 13, so that a high isolation is achieved.

[0078] According to the present embodiment, the contacts having an identical shape can be used as the first contact 11 and the second contact 12, which makes it unnecessary to separately manage the component members of the first contact 11 and the second contact 12, and also makes it unnecessary to consider their attaching positions.

[0079] Moreover, the first contact 11 and the second contact 12 having an identical shape are attached at the point-symmetric positions on the insulating housing 14 that is formed into a point-symmetric shape. Accordingly, the fixed pieces of the contacts can be disposed on the pattern of the circuit board, without considering their directions on the circuit board, and the contact having the fixed piece solder-connected to the pattern of the circuit board that is connected to the transmission/reception circuit 3 can be used as the first contact 11, while the contact having the fixed piece solder-connected to the pattern of the circuit board that is connected to the feeding point 2a of the antenna 2 can be used as the second contact 12.

[0080] Since the first contact 11 and the second contact 12 having an identical shape, and the insulating housing 14 around the first contact 11 and the second contact 12 are point-symmetric in shape, the signal lines of the first contact 11 and the second contact 12 in the receptacle connector 10 have identical characteristic impedance. Accordingly, the antenna signal of the antenna 2 can be compared in the inspecting circuit 4 with the antenna signal transmitted and received in the transmission/reception circuit 3, without considering the difference in loss of signal between the signal lines.

[0081] A description will now be given of a connection switching device 30 according to a second embodiment of the present invention with reference to FIGS. 10 and 11. The connection switching device 30 is configured to insulate between a first contact 32 and a second contact 33 when a plug 40 is connected to a receptacle connector 31, without the insulating projection 24 according to the first embodiment provided in the plug 40. The component members of the connection switching device 30 identical or corresponding to the component members of the connection switching device 1 according to the first embodiment are designated by identical reference numeral in the drawings to omit the description thereof.

[0082] Although the first contact 32 and the second contact 33 that are attached to the insulating housing 14 of the receptacle connector 31 are identical in shape, they do not have the component members corresponding to the fixed contact pieces 11c and 12c. Instead, the first contact 32 and the second contact 33 are formed such that the first elastic contact piece 11b and the second elastic contact piece 12b are supported in a cantilever manner on the distal end of the fixed pieces 11a and 12a each fixed to the insulating housing 14. Therefore, as shown in FIG. 10, in the normal state where the plug 40 is not connected, the first elastic contact piece 11b of the first contact 32 and the second elastic contact piece 12b of the second contact 33 are in elastic contact with the side surfaces of the normally closed terminal 13, respectively. Consequently, the transmission/reception circuit 3 and the feeding point 2a of the antenna 2 are electrically connected, so that the transmission/reception circuit 3 transmits or receives an antenna signal through or from the antenna 2.

[0083] Although the plug 40 includes the first plug pin 21 and the second plug pin 22, which are identical in shape and projected from the insulator 27, at positions facing the first elastic contact piece 11b and the second elastic contact piece 12b of the receptacle connector 31, neither the insulating projection 24 nor the ground terminal 25 is projected between the first plug pin 21 and the second plug pin 22.

[0084] As shown in FIG. 11, when the plug 40 is connected to the receptacle connector 31, the first plug pin 21 is brought into elastic contact with the first elastic contact piece 11b, and the second plug pin 22 is brought into elastic contact with the second elastic contact piece 12b, so that the first elastic contact piece 11b and the second elastic contact piece 12b are pressed downward in the drawing. As a result, the first elastic contact piece 11b and the second elastic contact piece 12b are electrically disconnected from the normally closed terminal 13, and the first contact 32 is insulated from the second contact 33. At the same time, the first elastic contact piece 11b of the first contact 32 is electrically connected to the first plug pin 21, and the second elastic contact piece 12b of the second contact 33 is electrically connected to the second plug pin 22. As a result, a connection between the antenna 2 and the transmission/reception circuit 3 is switched to a two-way connection composed of a connection between the inspecting circuit 4 and the transmission/reception circuit 3 and a connection between the inspecting circuit 4 and the antenna 2.

[0085] In the connection switching device 30 according to the present embodiment, the first contact 32 and the second contact 33 are also identical in shape, and the entire connection switching device 30 when the plug 40 is connected to the receptacle connector 31 is symmetric with respect to the normally closed terminal 13. Accordingly, a signal line connecting the first contact 32 and the first plug pin 21 and a signal line connecting the second contact 33 and the second plug pin 22 have identical high frequency signal characteristics, such as characteristic impedance, and therefore the antenna signal of the antenna 2 can be compared with the antenna signal transmitted and received in the transmission/reception circuit 3 without considering the difference in loss of signal between the individual signal lines.

[0086] Also in the connection switching device 30, the plug 40 may be provided with the ground terminal 25 connected to the ground, the ground terminal 25 being projected between the first plug pin 21 and the second plug pin 22. After the first plug pin 21 is brought into elastic contact with the first elastic contact piece 11b, and the second plug pin 22 is brought into elastic contact with the second elastic contact piece 12b, the ground terminal 25 may electrically be connected to the normally closed terminal 13, and the normally closed terminal 13 having the electric potential changed to the ground potential may be used to disconnect the signal line connecting the first plug pin 21 and the first contact 32 from the signal line connecting the second plug pin 22 and the second contact 33.

[0087] When there is little need to shield the signal line connecting the first plug pin 21 and the first contact 11 from the signal line connecting the second plug pin 22 and the second contact 12 in the connection switching device 1 according to the first embodiment, it is not necessary to provide the plug 20 with the ground terminal 25.

[0088] The present invention is not limited to the embodiments disclosed but accommodates various modifications. For example, the first contact 11 and the second contact 12, or the first contact 32 and the second contact 33 may be different in shape. When the normally closed terminal 13 that is attached to the center of the insulating housing 14 has a bilaterally symmetric shape like the first contact 32 and the second contact 33, the first contact 32 and the second contact 33 may be attached to the insulating housing 14 at positions symmetric with respect to the normally closed terminal 13.

[0089] In the above-described respective embodiments, the connection switching device that switches a connection between the antenna 2 and the transmission/reception circuit 3 to a two-way connection composed of a connection between the inspecting circuit 4 and the transmission/reception circuit 3 and a connection between the inspecting circuit 4 and the antenna 2 has been described. However, the present invention is applicable to any connection switching device as long as the connection switching device switches connections between the circuits that deliver an RF signal, even when the first plug pin 21, the second plug pin 22, the first contacts 11 and 32, and the second contacts 12 and 33 are connected to any circuit or circuit components.

[0090] The present invention is suitable as a connection switching device that switches a connection between an antenna and a transmission/reception circuit that transmits and receives an antenna signal to a two-way connection composed of a connection between the antenna and an inspecting circuit and a connection between the transmission/reception circuit and the inspecting circuit.

REFERENCE SIGNS LIST

[0091] 1, 30 connection switching device [0092] 2a feeding point of antenna [0093] 3 transmission/reception circuit [0094] 4 inspecting circuit [0095] 10, 31 receptacle connector [0096] 11, 32 first contact [0097] 11b first elastic contact piece [0098] 11d first plate electrode portion [0099] 12, 33 second contact [0100] 12b second elastic contact piece [0101] 12d second plate electrode portion [0102] 13 normally closed terminal [0103] 14 insulating housing [0104] 20, 40 plug [0105] 21 first plug pin (probe) [0106] 22 second plug pin (probe) [0107] 24 insulating projection [0108] 25 ground terminal