The present invention relates to a coaxial connector to be mounted on a board. More specifically, the present invention relates to a coaxial connector having a switch, which has a switching mechanism to switch high-frequency signal circuits.
A conventional coaxial connector having a switch has been widely used for inspecting built-in high-frequency circuits in a portable communication device such as a cell phone and the like.
The conventional coaxial connector having the switch includes, for example, an insulation housing, which has a vertical hole that can receive a central conductive member of a coaxial plug therein, and an outer conductor provided outside the insulation housing. The conventional coaxial connector further includes a stationary terminal and a movable terminal, which are provided below the vertical hole. The stationary terminal has a contact portion, and the movable terminal has a fixed portion to be secured on the insulation housing and an elastic portion that can abut against the central conductive member of the coaxial plug and can contact with the contact portion (for example, see Patent Reference).
Patent Reference: Japanese Patent Publication No. 2007-141665
In the conventional coaxial connector having the switch, when the coaxial plug is not attached thereto, the movable terminal is pushed against the contact portion of the stationary terminal by an elastic force of the elastic portion, so that the stationary terminal is electrically connected to the movable terminal. On the other hand, when the coaxial plug is attached to the conventional coaxial connector, a lower end portion of the central conductive member of the coaxial plug is inserted in the vertical hole of the connector. In this state, the central conductive member abuts against the elastic portion. Accordingly, the elastic portion is pushed down by the central conductive member, so as to be elastically deformed and moved away from the contact portion. As a result, the stationary terminal is electrically disconnected from the movable terminal. At the same time, the central conductive member is electrically connected to the movable terminal. When the coaxial plug is attached to the conventional coaxial connector, a signal, which is flowing from the movable terminal to the stationary terminal, flows from the movable terminal to the central conductive member. Accordingly, it is possible to inspect a high-frequency circuit that is connected to the movable terminal.
In the conventional coaxial connector described above, even after the movable terminal and stationary terminal are assembled into the insulation housing, an insertion hole, through which the movable terminal, especially the elastic portion thereof, is inserted into the insulation housing, remains an opened state. Accordingly, a foreign substance may enter the conventional coaxial connector through the insertion hole, so that the foreign substance causes an adverse effect on connection between the stationary terminal and the movable terminal.
Patent Reference has disclosed a technique to solve such a problem. According to Patent Reference, the conventional coaxial connector has an extending section disposed on a side of the insulation housing where the movable terminal is inserted in. After the movable terminal is inserted in the insulation housing through the insertion hole, a pressing section provided on the outer conductor is bent downwardly to bend downwardly the extending section of the insulation housing, so that the insertion hole is closed.
According to the technique disclosed in Patent Reference, it is necessary to provide an additional step of bending the pressing section and the extending section to close the insertion hole. Further, it is difficult to reduce an outer dimension of the conventional coaxial connector due to the pressing section and the extending section.
In view of the problems described above, an object of the invention is to provide a coaxial connector having a closing structure capable of preventing a foreign substance from entering without an additional step such as a bending process and the like.
Further objects and advantages of the invention will be apparent from the following description of the invention.
In order to attain the objects described above, according to a first aspect of the present invention, a coaxial connector with a switch to be mounted on a circuit board includes an insulation housing, which has a hole that can accept therein a central conductive member of a coaxial plug from above, an outer conductor, which is provided outside the insulation housing and in which an outer conductor of the coaxial plug can be attached/detached, and a stationary terminal and a movable terminal, which are provided below the hole and can contact/move away from each other.
In the first aspect of the present invention, the insulation housing has an insertion hole to press the movable terminal therein and a press deformation section, which is provided on an upper portion of the insertion hole. The press deformation section is pressed down by the pressing section upon attachment of the outer conductor top the insulation housing and thereby closes the insertion hole. The stationary terminal has a contact portion and the movable terminal has a fixed portion to be secured onto the insulation housing and an elastic portion, which extends like a cantilever from the fixed portion, capable of abutting against the central conductive member of the coaxial plug and contact with the contact portion.
In the first aspect of the present invention, when the central conductive member of the coaxial plug is not fitted into the hole of the insulation housing, the elastic portion contacts with the contact portion, and thereby the stationary terminal and the movable terminal are electrically connected. When the central conductive member of the coaxial plug are fitted in the hole of the insulation housing, the central conductive member abuts to the elastic portion so as to move the elastic portion away from the contact portion and thereby the stationary terminal and the movable terminal are electrically disconnected. Accordingly, the central conductive member of the coaxial plug and the movable terminal are electrically connected.
According to a second aspect of the present invention, a method of assembling a coaxial connector with a switch to be mounted on a circuit board includes: a first step of pressing the movable terminal into space inside the insulation housing through a first insertion hole; a second step of pressing the stationary terminal in the space inside the insulation housing through a second insertion hole of the insulation housing; and a third step of covering the insulation housing with the outer conductor from above and then bending a side face of the outer conductor so as to swage. In the third step, the press deformation section provided on an upper portion of the first insertion hole of the insulation housing is pressed down by the pressing section of the outer conductor so as to bend the press deformation section downward, and thereby the first insertion hole is closed.
According to the invention, it is possible to easily prevent foreign substances from entering the coaxial connector with the simple structure.
Hereunder, embodiments of the invention will be fully described based on the accompanying drawings. Here, in the drawings showing the embodiments of the invention, basically, the same reference numerals are used for the same members and repetitive explanation is omitted.
As shown in
The coaxial connector 21 can be mounted on a circuit board (not illustrated), and can form a part of a board circuit being connected to the circuit board via a board connection section 38 (well illustrated in
A step-like section 30 is annularly formed under an outer circumferential portion, which is generally cylindrical, on an upper portion of the insulation housing 22. There is an annular groove 32 having a semicircular section on the outer circumferential face of an upper portion 31 of the outer conductor 23. The annular groove 32 having a semicircular cross-section is formed on an outer circumferential surface of the upper portion 31 of the outer conductor 23, and a lower end (not illustrated) of the outer conductor on the coaxial plug side can be fitted to the annular groove 32.
In addition, a conical depression 34 is formed on an upper face of the insulation housing 22, and a vertical hole 35 that can accept a central conductive member of the coaxial plug from above is formed at a center part of the bottom surface of the depression 34. Furthermore, under the vertical hole 35, there is a laterally long space 36 that connects to the vertical hole 35. When a coaxial plug (not illustrated) is attached to the coaxial connector 21, a lower end of the central conductive member (not illustrated) is inserted in the vertical hole 35 and reaches the space 36.
As well illustrated, the movable terminal 25 has a flat fixed portion 42, a board connecting section 43, which is formed by being bent downward into U-shape from the base end side of the fixed portion 42, and an elastic portion 44 that extends like a cantilever diagonally upward toward the tip from the fixed portion 42. The elastic portion 44 can abut to the central conductive member of the coaxial plug, and can contact with a lower end of the contact portion 40 of the stationary terminal 24, which will be described later, at the front end side than the abutting position.
A wedge-like protrusion 45 is formed on the side section of the fixed portion 42 and the fixed portion 42 is horizontally pressed in space 36 through an insertion hole 50 of the insulation housing 22 from the opposite side to the press-in direction of the stationary terminal 24 via the protrusion 45. The insertion hole 50 is a generally protruded opening so as to allow insertion of the elastic portion 44. The both outer circumferential sections of the elastic portion 44 are broadened from a position near the abutting position towards the fixed portion 42 of the movable terminal 25, and have a shape that is curved to depress.
Further, the elastic portion 44 has a notched section 47 on the fixed portion 42 side from the abutting position, and the notched section 47 extends along the elastic portion 44. Moreover, the fixed portion 42 has a vertical piece 61, and this vertical piece 61 is formed to have a sharp angle towards the opening of the inside (space 36) of the insertion hole 50. These configurations enable prevention of intrusion of foreign substances from the insertion hole 50.
Especially when the insertion hole 50 is left open, a contact point between the contact portion 40 and the elastic portion 44 can be directly seen from the insertion hole 50. Therefore, the above effects can be achieved by deforming the press deformation section 53 so as to make the contact point not directly seen.
As well shown in
The fixed portion 37 has wedge-like protrusions 39 formed on the side portion, and through those protrusions 39, the fixed portion 37 is horizontally pressed in the space 36 through an insertion hole 80 of the insulation housing 22 from the side of the insulation housing 22. As a result, the fixed portion 37 is placed in the insulation housing 22 and sections other than that, the arm 48 and the board connecting section 38, are left exposed to outside the insulation housing 22. Further, the fixed portion 37 has a contact portion 40, which protrudes downward, at a generally center portion thereof (see
As well shown in
In addition, as well shown in
As well shown in
The coaxial connector 21 having a switch according the first embodiment may be used for inspecting a high-frequency circuit to be built in a portable communication device such as a cellular phone machine. In addition, the outer conductor 23 is shielded for a high-frequency circuit and impedance is matched between the movable terminal 25 and the stationary terminal 24.
When the coaxial plug (not illustrated) is not attached, the movable terminal 25 is pressed onto the contact portion 40 of the stationary terminal 24 by elastic force of the elastic portion 44, and the stationary terminal 24 and the movable terminal 25 keep their electrically connected states. When the coaxial plug is attached, a lower end portion of an outer conductor (not illustrated) of the coaxial plug abuts to the outer conductor 23 and the lower end portion of the central conductive member (not illustrated) of the coaxial plug is inserted into the vertical hole 35.
In this state, the central conductive member of the coaxial plug abuts the elastic portion 44. At this time, since the elastic force of the central conductive member of the coaxial plug is stronger than that of the elastic portion 44, the elastic portion 44 is pressed down by the central conductive member of the coaxial plug to elastically deform and moves away from the contact portion 40, and thereby the stationary terminal 24 and the movable terminal 25 are electrically disconnected. At the same time, the central conductive member of the coaxial plug and the movable terminal 25 are in their electrically connected state.
With this operation, signals that flow from the movable terminal 25 to the stationary terminal 24 can flow from the movable terminal 25 to the central conductive member of the coaxial plug and thereby it is possible to inspect a high-frequency circuit.
Referring now to
As shown in
Then, as shown in
Thereafter as shown in
Accordingly, according to the coaxial connector having a switch 21 of the first embodiment, since the insertion hole 50 is closed and the closed section is formed at the same time as attaching the outer conductor 23 to the insulation housing 22, it does not require an additional step, such as the step of bending a pressing section or extending section as in the technique described in Patent Reference 1, and it is also possible to reduce intrusion of foreign substances into the product.
Moreover, since it does not require a pressing section or an extending section, it is also possible to reduce the outer dimension of the product. Further, since the fixed portion 42 of the movable terminal 25 has a vertical section 61, intrusion of foreign substances inside the space of the space 36 from the insertion hole 50 can be even more securely prevented.
A second embodiment of the present invention will be explained next.
More specifically,
While a portion of the pressing section 70 of the outer conductor 23, which faces the insulation housing 22, protrudes in the coaxial connector 21 of the first embodiment, the pressing section 70a of the outer conductor 23a is flat and a portion of the press deformation section 53a of the insulation housing 22a, which faces the outer conductor 23a, protrudes in the coaxial connector 21a of the second embodiment. Upon attaching the outer conductor 23a to the insulation housing 22a, the protrusion of the press deformation section 53a of the insulation housing 22a is pressed down by the pressing section 70a to deform the press deformation section 53a, and thereby the insertion hole 50 is closed. In other words, the press deformation section 53a can work as a closing section to close the insertion hole 50.
Here, since other portions of the coaxial connector 21a of the second embodiment are similar to those in the coaxial connector 21 of the first embodiment, explanation is omitted.
Therefore, according to the coaxial connector having a switch 21a of the second embodiment, it is possible to achieve similar effects to those in the coaxial connector having a switch of the first embodiment.
In the above description, aspects of the invention are described in detail based on the embodiments, but it should be noted that the invention shall not be limited to those embodiments and may be varied, altered, or modified within the scope of the invention.
For example, in the above-described embodiments, a coaxial connector having a switch for a high-frequency circuit is described, but the application is not limited to this and the invention may be applied to even other general connectors. Especially, the invention can significantly achieve the effects in connectors in which intrusion of foreign substance is a critical matter.
The disclosure of Japanese Patent Application No. 2009-084990, filed on Mar. 31, 2009 is incorporated in the application by reference.
While the invention has been explained with reference to the specific embodiments of the invention, the explanation is illustrative and the invention is limited only by the appended claims.
Number | Date | Country | Kind |
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2009-084990 | Mar 2009 | JP | national |
Number | Name | Date | Kind |
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7794253 | Wang et al. | Sep 2010 | B2 |
7891979 | Chien et al. | Feb 2011 | B2 |
7927108 | Gong et al. | Apr 2011 | B2 |
Number | Date | Country |
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2007-141665 | Jun 2007 | JP |
Number | Date | Country | |
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20100248539 A1 | Sep 2010 | US |