JP2002042986A - Coaxial connector having circuit switching function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coaxial connector having circuit switching function capable of switching a circuit depending on the insertion of a male coaxial connector and stabilizing the impedance of a signal transmission path. SOLUTION: A spring connector 34 is provided on an insulating base 30 so that one end thereof abuts on a circuit board 28 in the state arranged on the circuit board 28, and a conducting connector 36 is provided so that the tip surface of a movable plunger 34a provided on the other end side of the spring connector partially makes elastic contact therewith. A central conductor 38 is provided so as to be capable of reciprocating in the protruding direction of the movable plunger 34a to abut on the other part of the tip surface of the movable plunger 34a without abutting on the conducting conductor 36 so that it can be separated from the conducting connector 36. An external conductor 44 coaxial to the central conductor 38 to form a coaxial structure is provided to elastically energize the central conductor 38 in the protruding direction and regulate the protruding directional movement of the movable plunger 34a in the state separated therefrom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial connector having a circuit switching function for switching a circuit depending on whether a male coaxial connector such as an external antenna plug is inserted or not.

[0002]

2. Description of the Related Art In a portable telephone or the like, an internal antenna is provided in a housing. When the external antenna is not connected, the internal antenna functions as an antenna. When the external antenna is connected, the internal antenna operates as an antenna. Some are separated from the circuit and an external antenna is connected to the circuit to act as an antenna. The plug, which is the insertion portion of the external antenna, is formed as a male coaxial connector as an example, and is configured such that the circuit can be switched depending on whether or not the male coaxial connector is inserted.

A conventional example of such a coaxial connector is disclosed in Japanese Patent Application Laid-Open No. H11-251001. This prior art structure will be briefly described with reference to FIG. FIG.
1 is a longitudinal sectional view of a conventional example of a coaxial connector having a circuit switching function.

In FIG. 3, central conductors 12 and 14 are disposed so as to be reciprocally movable with one end protruding from an insulating base, and an external coaxial structure is formed coaxially with these central conductors 12 and 14. Conductors 16 and 18 are provided,
First and second coaxial connectors 20, 22 are formed. Also, the center conductors 12, 1 protruding on the opposite side of the insulating base 10
Conductive leaf springs 24 and 26 are respectively provided in elastic contact with the other end of the fourth. In addition, when the center conductor 12 of the first coaxial connector 20 is pushed in and the conductive leaf spring 24 is elastically deformed as indicated by a dashed line, the conductive leaf springs 24 and 26 are separated and the electrical connection is cut. In a state where the center conductor 12 is not pushed in, the conductive leaf springs 24 and 26 are in elastic contact with each other to be electrically connected. Then, one end of the conductive leaf spring 24 is connected to the signal pattern of the circuit board 24. In addition,
The outer conductors 16 and 18 are appropriately connected to the ground pattern of the circuit board 24.

In such a conventional structure, an internal antenna or the like is connected to the second coaxial connector 22. If the male coaxial connector of the external antenna plug is not inserted into the first coaxial connector 20, the internal antenna electrically connects to the signal pattern of the circuit board 28 via the center conductor 14 and the conductive leaf springs 26 and 24 in order. A connection is made. When the male coaxial connector of the external antenna plug is inserted into the first coaxial connector 20, the center conductor 12 is pushed in against the elasticity, and the conductive leaf springs 24 and 26 are separated.
The external antenna is electrically connected to the signal pattern of the circuit board 28 via the center conductor 12 and the conductive leaf spring 24 in this order. Here, the internal antenna is in a state of being electrically separated from the circuit board 28.

[0006]

In the above-mentioned prior art, circuits are switched according to the presence or absence of a male coaxial connector as an external antenna plug, and an appropriate circuit configuration is made.

However, in this prior art, when the male coaxial connector is not inserted into the first coaxial connector 20, noise such as unnecessary electromagnetic waves from the outside is transmitted through the central conductor 12 to the circuit board 28. There is a problem that the signal pattern can be transmitted. A conductive leaf spring 24 for switching the circuit is provided on the outside of the insulating base 10 facing the circuit board 28. When the insulating base 10 is soldered and fixed to the circuit board 28, the conductive plate spring 24 is used. Unwanted solder easily adheres to the contact between the spring 24 itself and the conductive leaf spring 26 or the like, or is easily exposed to a flux gas or the like, and the circuit switching lacks certainty. Further, the conductive leaf spring 24, which is a signal transmission path, is elastically deformed by the insertion of the male coaxial connector, the shape is not always constant, the impedance is unstable, and there is a possibility that the matching with the male coaxial connector is displaced. .

The present invention has been made to solve the above-mentioned disadvantages of the prior art. The impedance of the signal transmission path is stable, and the circuit can be switched reliably without being affected by soldering. It is another object of the present invention to provide a coaxial connector having a circuit switching function in which noise such as external electromagnetic waves is not transmitted to a signal transmission path.

[0009]

In order to achieve the above object, the present invention provides a coaxial connector having a circuit switching function.
A spring connector is provided on the insulating base so that one end thereof is in contact with the circuit board in a state where the spring connector is disposed on the circuit board. A connecting body is provided on the insulating base, and the movable plunger is reciprocally movable in a projecting direction of the movable plunger and abuts on the other end portion of the movable plunger without abutting on the conductive connecting body. A center conductor is provided on the insulating base so that the plunger can be separated from the conductive connection body, and the center conductor is elastically urged in the protruding direction and moved in the protruding direction while being separated from the movable plunger. And an outer conductor which is coaxial with the center conductor and forms a coaxial structure is provided on the insulating base.

[0010] Further, the movable plunger may be configured to abut on the conductive connecting member and the center conductor in a space provided in the insulating base.

A large-diameter portion is provided at an intermediate portion of the center conductor, and an inner conductor electrically connected to the outer conductor is provided. The large-diameter portion is brought into contact with the inner conductor so that removal is restricted. Can also be configured.

Further, it is possible to provide a second spring connector provided on the insulating base by making one end abut on the conductive connecting body and projecting the movable plunger at the other end to the outside.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of a practical example of a coaxial connector having a circuit switching function according to the present invention. FIG. 2 is a diagram showing a state where the coaxial connector having the circuit switching function of FIG. 1 is assembled.

In FIG. 1, a space 32 is provided inside an insulating base 30 made of an insulating resin or the like. Then, with the insulating base 30 disposed on the circuit board 28,
One end abuts on the signal pattern of the circuit board 28, and the movable plunger 34 a at the other end faces the space 32,
A spring connector 34 is provided on the insulating base 30.
Further, a plate-shaped conductive connection body 36 is provided in the space 32, and a part of the distal end surface of the movable plunger 34a is elastically contacted to one end thereof. And the spring connector 34
A central conductor 38 made of a substantially rod-shaped conductive material is disposed on the insulating base 30 in a reciprocating manner in the direction in which the movable plunger 34a projects. The center conductor 38 is connected to the conductive connector 3.
6 without being in contact with the other end of the movable plunger 34a. A large-diameter portion 38 a is provided at an intermediate portion of the center conductor 38. The large-diameter portion 38a abuts the cap-shaped inner conductor 40 provided on the insulating base 30 coaxially with the center conductor 38 from the outside and having a hole formed in the center of the bottom, and the center conductor 38 is moved outward. It is regulated to escape. The distal end side of the center conductor 38 projects through a hole formed in the inner conductor 40 without contacting the edge of the hole. Further, the large diameter portion 38a
And the coil spring 42 is contracted between the insulating base 30 and
The center conductor 38 is elastically urged in the protruding direction. Further, a substantially cylindrical outer conductor 44 coaxial with the center conductor 38 and having a tapered tip end is disposed on the insulating base 30.
The central conductor 38 and the outer conductor 44 form a coaxial structure. The inner conductor 40 is electrically connected to the outer conductor 44 in a fitted state, and the outer conductor 44 is appropriately electrically connected to the ground pattern of the circuit board 28 with the insulating base 30 disposed on the circuit board 28. Connected. On the insulating base 30, the movable plunger protrudes outward on the side opposite to the side where the movable plunger is attached to the circuit board 28, and the other end abuts on the conductive connection body 36, thereby forming two second spring connectors 46. , 46 are provided.

Then, as shown in FIG.
A coaxial connector having a circuit switching function of the present invention, which is disposed by soldering or the like, is provided on a case 5 of a cellular phone as an example.
Assembled in 0. In this assembled state,
The external conductor 44 is open to the outside of the housing 50, and a male coaxial connector 52 such as an external antenna plug can be inserted from the outside into a coaxial connector including the center conductor 38 and the external conductor 44. Also, two second spring connectors 4
The movable plungers 6 and 46 are appropriately resiliently connected to the signal pan turn of the antenna substrate 54 to which the internal antenna is connected.

In such an assembled state, the male coaxial connector 5
2, the external conductor 52a is fitted into the external conductor 44 to be electrically connected thereto, and the central conductor 52b pushes the central conductor 38 against the elasticity of the coil spring 42. The movable plunger 34a is pressed against the movable plunger 34a. As a result, when the male coaxial connector 52 is inserted, its central conductor 52b is electrically connected to the signal pattern of the circuit board 28 via the central conductor 38 and the spring connector 34 in that order. At the same time, the spring connector 34
Of the movable plunger 34a is separated,
Circuit is electrically isolated.

When the male coaxial connector 52 is not inserted, the signal pattern of the antenna board 54 is sequentially transmitted through the second spring connectors 46, 46, the conductive connector 36 and the spring connector 34 to the signal pattern of the circuit board 28. Is electrically connected to

As described above, in the coaxial connector having the circuit switching function of the present invention, the circuit is switched depending on whether the male coaxial connector 52 is inserted or not. Since the movable plunger 34a of the spring connector 34, which is a switching part of the circuit, and the conductive connecting body 36 or the center conductor 38 abut on the space 32 provided in the insulating base 30, solder or flux gas Without being affected by
Circuits can be reliably switched without problems such as inseparability or poor contact. When the male coaxial connector 52 is not inserted, the center conductor 38 is in contact with the inner conductor 40 to be electrically connected, is grounded via the outer conductor 44, and is separated from the movable plunger 34a of the spring connector 34. Therefore, it acts as a magnetic shield, so that noise such as unnecessary external electromagnetic waves is not transmitted to the signal pattern of the circuit board 28 via the center conductor 38 as in the conventional example. further,
The switching of the circuit is performed by projecting and pushing the movable plunger 34a of the spring connector 34, the impedance of the signal transmission path in the state of being connected to each is stabilized, and matching with both the internal antenna and the external antenna is performed. It can be achieved reliably.

In the above-described embodiment, a part of one corner of the distal end surface of the movable plunger 34a of the spring connector 34 is in contact with the conductive connecting member 36. However, the present invention is not limited to this.
The movable plunger 3 is formed by making the end of the conductive connection body 36 annular.
Center conductor 38 so that the peripheral edge of the tip end surface of
May contact the center of the distal end surface of the movable plunger 34a without penetrating the center of the end of the conductive connection body 36 without contacting the center. Also, the antenna substrate 54
Is reliably and electrically connected to the conductive connection body 36 via the two second spring connectors 46, 46, but may be one, and the antenna substrate 54 may be connected to the conductive connection body 3
6 may be appropriately configured so as to be electrically connected directly. Further, when the male coaxial connector 52 as the external antenna plug is not inserted, the center conductor 38 is separated from the movable plunger 34a of the spring connector 34, and therefore does not necessarily need to be grounded via the inner conductor 40. Furthermore, a movable plunger 34a of a spring connector 34, which is a part for performing a circuit switching operation.
The contact between the conductive connection body 36 and the center conductor 38 is not limited to the one made in the space 32 provided in the insulating base 30, and is opposite to the mounting side of the insulating base 30 to the circuit board 28, You may comprise so that it may be performed in the position which has no influence by soldering.

[0020]

As described above, since the coaxial connector having the circuit switching function of the present invention is constituted, the following special effects can be obtained.

In the coaxial connector having a circuit switching function according to the first aspect, when the male coaxial connector is inserted, the center conductor of the male coaxial connector is electrically connected to the signal pattern of the circuit board, and the conductive connection is made. The body is electrically isolated. Also, when the male coaxial connector is not inserted,
The conductive connector is electrically connected to the signal pattern on the circuit board. Thus, the circuit is switched depending on whether or not the male coaxial connector is inserted. Further, this circuit switching is performed by projecting and pushing the movable plunger of the spring connector, and the impedance of the signal transmission path formed for each is stable, and matching is easily achieved. Further, with the male coaxial connector not inserted, the center conductor is separated from the movable plunger of the spring connector and is not electrically connected. Therefore, external noise such as unnecessary electromagnetic waves is not transmitted to the signal transmission path via the center conductor.

Further, in the coaxial connector having the circuit switching function according to the second aspect, the operation of switching the circuit is performed by:
Since it is made in the space provided in the insulating base, when soldering to the circuit board, there is no solder attached to the part that performs the switching operation or exposure to flux gas,
Reliable switching is obtained.

In the coaxial connector having the circuit switching function according to the third aspect, when the male coaxial connector is not inserted, the center conductor is grounded via the inner conductor and the outer conductor, so-called a magnetic shield. , And noise such as unnecessary electromagnetic waves from the outside is surely shielded, and external noise does not enter the signal pattern.

Further, in the coaxial connector having the circuit switching function according to the fourth aspect, the circuit in contact with the movable plunger of the second spring connector is securely electrically connected to the conductive connection body. Therefore, in a state where the male coaxial connector is not inserted, the circuit in contact with the movable plunger of the second spring connector can be reliably electrically connected to the signal pattern on the circuit board.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a practical example of a coaxial connector having a circuit switching function according to the present invention.

FIG. 2 is a diagram showing a state where the coaxial connector having a circuit switching function of FIG. 1 is assembled.

FIG. 3 is a longitudinal sectional view of a conventional example of a coaxial connector having a circuit switching function.

[Explanation of symbols]

 10, 30 Insulating base 12, 14, 38 Central conductor 16, 18, 44 Outer conductor 28 Circuit board 32 Space 34 Spring connector 36 Conductive connector 38a Large diameter portion 40 Inner conductor 42 Coil spring 46 Second spring connector

Claims (4)

[Claims] A spring connector is provided on an insulating base so that one end of the spring plunger is in contact with the circuit board in a state where the spring connector is disposed on the circuit board. A conductive connecting body is provided on the insulating base so as to be elastically contacted, and is reciprocally movable in a protruding direction of the movable plunger, and is provided on the other end portion of the movable plunger without contacting the conductive connecting body. A central conductor is provided on the insulating base so that the movable plunger can be separated from the conductive connector by abutting, and the central conductor is elastically urged in the protruding direction and separated from the movable plunger. Regulates movement in the direction of protrusion,
A coaxial connector having a circuit switching function, wherein an outer conductor forming a coaxial structure coaxial with the center conductor is provided on the insulating base. 2. The coaxial connector having a circuit switching function according to claim 1, wherein the movable plunger is brought into contact with the conductive connection body and the center conductor in a space provided in the insulating base. A coaxial connector having a circuit switching function, which is configured as described above. 3. The coaxial connector having a circuit switching function according to claim 1, wherein a large-diameter portion is provided at an intermediate portion of said center conductor, an inner conductor electrically connected to said outer conductor is provided, and said inner conductor is provided. A coaxial connector having a circuit switching function, characterized in that the large-diameter portion is configured to abut to restrict the detachment. 4. The coaxial connector having a circuit switching function according to claim 1, wherein one end of the second spring connector is brought into contact with the conductive connection body and the other end of the movable plunger is projected to the outside to insulate the second spring connector. A coaxial connector having a circuit switching function, wherein the coaxial connector is provided on a base.