JP4929511B2 - Coaxial connector and coaxial connector terminal used therefor - Google Patents

Description

  The present invention relates to a coaxial connector and a terminal for a coaxial connector used therefor.

  In the field of electronic equipment such as cellular phones, miniaturization of devices is rapidly progressing. Accordingly, there is a strong demand for downsizing, for example, coaxial connectors used in electronic devices. A coaxial connector is generally a connector having a pair of contact pieces that are flat terminals and a cylindrical (pin-shaped) counterpart that maintains a contact state between the terminals by being sandwiched between the pair of contact pieces. It consists of a pair with a mating connector having terminals. For example, Japanese Patent Application Laid-Open No. 2006-318936 and Japanese Patent Application Laid-Open No. 08-30764 show conventional coaxial connectors.

JP 2006-318936 A Japanese Patent Laid-Open No. 08-37064

  However, in the conventional structures disclosed in these publications, when the connector is twisted, for example, one of the pair of contact pieces is separated from the mating terminal, and as a result, the contact point is in contact with the other contact. There was a risk of a one-point contact between the piece and the mating terminal. Further, since the contact surface of the contact piece is flat, there is a problem that it is difficult to stabilize the contact position with the counterpart terminal. Furthermore, as the height of the connector is reduced, the spring length of the contact piece tends to be shortened. As a result, there is a problem that sufficient stress cannot be secured.

  Furthermore, for example, as disclosed in the latter Japanese Patent Application Laid-Open No. 08-30764, wings are provided on the left and right sides of the contact pieces, and concave contact pieces are formed by bending these wings, thereby making contact with the mating terminal. However, the downsizing of the device makes it difficult to bend the wings. As a result, there is a problem that the contact state becomes unstable due to the unstable shape.

  The present invention has been made in order to solve these problems in the prior art. The contact between the contact piece and the mating terminal is made to be a multipoint contact so that the contact can be stabilized and the contact position between the terminals can be easily positioned. Furthermore, it is an object of the present invention to provide a coaxial connector that is easy to process and inexpensive to manufacture, and a coaxial connector terminal used therefor.

  According to one aspect of the present invention, a plurality of contact pieces extending in a fitting direction with a counterpart terminal, and at least a contact portion of at least one inner surface of the plurality of contact pieces with the counterpart terminal, A coaxial connector comprising a terminal having a recess formed along a fitting direction, an insulator that holds the terminal, and an outer conductor that houses the insulator.

  In the coaxial connector, it is preferable that the plurality of contact pieces are tapered along the fitting direction.

  Moreover, the said coaxial connector WHEREIN: The said contact piece is formed so that it may be bent from the main body of the said terminal, and the said recessed part may be provided ranging from the bending part vicinity to the said contact part. Moreover, you may provide a notch in the vicinity of this bending part.

  Furthermore, in the coaxial connector, the recess may be curved.

  Further, according to another aspect of the present invention, a pair of contact pieces extending opposite to each other in a fitting direction with the counterpart terminal, and at least a contact portion of the opposing surface of the pair of contact pieces with the counterpart terminal The terminal for a coaxial connector is characterized in that a recess is formed along the fitting direction.

  Hereinafter, a coaxial connector according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a cross-sectional view of an example coaxial connector according to the present invention. The coaxial connector 10 includes a pair of a connector 50 and a mating connector 70 that can be fitted to the connector 50.

  The connector 50 mainly includes a terminal 51, an insulator 54 that holds the terminal 51, and an external conductor 58 that accommodates the insulator 54.

  For example, a coaxial cable C is connected to the connector 50. As is well known, the coaxial cable C has a shield line C2 serving as a ground path, a dielectric C3, and a center conductor C4 serving as an impedance-matched signal path in order in the outer sheath C1. The coaxial cable C used here may be the same as that generally used. In particular, the center conductor C4 is connected to the terminal 51 by soldering.

A perspective view of the terminal 51 is shown in FIG. The terminal 51 is formed by bending a metal plate. The terminal 51 includes a pair of flat contact pieces 53 and 53 ′ used for contact with the flat connection portion 52 to which the signal path of the central conductor C 4 is connected and the counterpart terminal 71 of the counterpart connector 70. The connecting portion 52 is a portion forming the main body of the terminal 51, and is a flat base portion 52A arranged in a direction orthogonal to the fitting direction on an extension line of the fitting direction with the mating terminal 71, and It consists of a front overhanging portion 52B that extends a little forward from the base 52A, and a rear extension 52C that greatly extends rearward on the contrary. Wall portions 52D and 52D ′ are provided at the rear end portion of the rearward extending portion 52C so as to form a slit 52E. Further, the stepped portion is formed in a continuous manner from the slit 52E. 52F is formed. When connecting the coaxial cable C to the terminal 51, the dielectric C3 of the coaxial cable C is positioned in contact with the walls 52D and 52D ′ while passing through the slit 52E, and the central conductor C4 is disposed in the recess 52F. Soldered to. As a result, the dielectric pair C3 of the coaxial cable C is electrically connected to the terminal 51. On the other hand, the shield wire C2 of the coaxial cable C is electrically connected to the external conductor 58 via the external conductor 58 (outer lid portion 60), and is sandwiched by the part 58A of the external conductor 58 together with the outer skin C1. Thereby, the coaxial cable C is positioned at a predetermined position of the terminal 51. The contact pieces 53 and 53 ′ are formed so as to be bent from the left and right side edges of the base (main body) 52 </ b> A so as to form a tongue piece shape, and face each other in the fitting direction with the mating terminal 71 of the mating connector 70. It extends and is tapered along the fitting direction so that the mating terminal 71 can be clamped. The tips 53F and 53F ′ of the tapered contact pieces 53 and 53 ′ are widened toward the mating terminal 71, and guide recesses 53G and 53G ′ for guiding the mating terminal 71 are formed on the opposing surfaces thereof. Is formed. The inner surfaces (contact surfaces) 53A and 53A ′ facing each other of the contact pieces 53 and 53 ′ have a flat plate shape in a direction orthogonal to the fitting direction, so that multipoint contact with the mating terminal 71 is possible. In addition, recesses 53B and 53B ′ that are continuous with the guide recesses 53G and 53G ′ along the fitting direction with the mating terminal 71 are formed at substantially the center positions of the contact surfaces 53A and 53A ′. These concave portions 53B and 53B ′ are arranged not only in contact portions (edge portions 53C ₁ and 53C ₂ ) with the mating terminal 71 but also in the vicinity of bent portions 53D and 53D ′ between the base portion (main body) 52A and the contact pieces 53 and 53 ′. To the contact portions (53C ₁ , 53C ₂ ), the stress can be more effectively dispersed. The recesses 53B and 53B ′ (not shown) are preferably provided from the guide recesses 53G and 53G ′ to the inner surface of the base 52A.

  The insulator 54 is made, for example, by molding an insulating material. The insulator 54 includes a base portion 54A, a substantially cylindrical main body portion 54B connected to the base portion 54A via a flat plate portion 57, and an inner lid portion 54C connected to the distal end side of the main body portion 54B. In the center of the main body portion 54B, a hollow hole portion 55A that accommodates the tongue-like contact pieces 53A, 53B of the terminal 51 is provided so as to penetrate vertically, and the front upper surface 55B of the main body portion 54B has A plane on which the front overhanging portion 52B of the terminal 51 is placed is provided. When the contact piece 53 of the terminal 51 is accommodated in the hollow hole portion 55A, the front overhanging portion 52B is placed on the upper surface 55B, the hollow hole portion 55A is blocked by the base portion 52A, and the flat plate portion 57 is not rearward. The extension 52C is placed and stably held there. After the terminal 51 is disposed, the upper portion of the terminal 51 is covered by bending the inner lid portion 54 </ b> C together with the outer lid portion 60 of the outer conductor 58 described later.

  The outer conductor 58 is formed by bending a metal plate. The outer conductor 58 has a tubular portion 59 and an outer lid portion 60 connected to the distal end side of the tubular portion 59. The cylindrical portion 59 accommodates the main body portion 54B of the insulator 54 in a concentric position, and forms a cylindrical annular space 61 that receives the cylindrical outer conductor 73 of the mating connector 70 between the main body portion 54B. . Further, an annular inner protrusion 59 </ b> B that is used when mating with the mating connector 70 is provided on the side surface of the tubular portion 59. The outer lid portion 60 is horizontally disposed by being bent rearward together with the inner lid portion 54 </ b> C of the insulator 54, and forms the outermost portion of the terminal 51.

  The mating connector 70 mainly includes a mating terminal 71, an insulator 72, and an external conductor 73. The mating terminal 71 has a columnar (pin-shaped) contact portion 71A that is partially drawn and protruded in an axial shape, and a connection portion 71B that extends from the bottom in a plate shape. A side surface of the outer conductor 73 forms a cylindrical portion 73A having an annular constriction 73B.

  Thus, the connector 50 is configured so that the annular inner protrusion 59B formed on the side surface of the connector 50 is fitted into the annular constriction 73B of the mating connector 70 and the tubular portion 73A of the mating connector 70 is received in the annular space 61 thereof. The mating connector 70 is fitted to connect the terminals 51 and 71 to each other.

FIG. 3 shows a side view showing the contact state by extracting only the terminal 51 and the mating terminal 71, and FIG. 4 shows a cross-sectional view taken along line AA of FIG. Since the concave portions 53B and 53B ′ are formed on the facing surfaces (contact surfaces) 53A and 53A ′ of the contact pieces 53 and 53 ′, the contact pieces 53 and 53 ′ are in contact with the terminal 51 and the counterpart terminal 71, respectively. Sometimes two points (inward edges 53C ₁ and 53C ₂ , or inward edges 53C ₁ ′ and 53C ₂ ′ (not shown)) of the mating terminal 71 and the respective contact pieces 53 and 53 ′ ( It is possible to touch at a plurality of points instead of one point). In addition, in the case of a terminal having a radius of curvature as indicated by a dotted line, in addition to the edges 53C ₁ and 53C ₂ , the terminal can be brought into contact with the center 53C _{3 of the} recess 53B. This is not a contact but a three-point contact. That is, two or more line contact portions can be secured in each contact piece. By using multi-point contact as viewed from the direction orthogonal to the fitting direction, contact between terminals can be stabilized even when an external force is generated due to twisting or the like. Furthermore, by providing the recesses 53B and 53B ′, it is possible to ensure self-alignment (positioning) with the counterpart terminal 71 having a cylindrical cross section. The recesses 53B and 53B can be formed by punching from the inside of the contact surfaces 53A and 53B, for example. According to the punching process, the process is easier and the manufacturing cost is lower than the bending process, and the shape can be stabilized. In this case, the edges 53C ₁ and 53C ₂ are R Therefore, there is no worry of scraping off the mating terminal 71 when contacting the mating terminal 71.

  5 and 6 show a modification of the terminal in the same manner as in FIG. In these drawings, the same members as those in FIG. 2 are denoted by the same reference numerals. However, for the sake of convenience, the rear extension 52C shown in FIG.

The terminal 51A according to the modification of FIG. 5 uses a concave portion 53B ₁ whose inner surface is curved. In particular, when the degree of bending is matched with the bending of the mating terminal 71, the terminal 51A can be brought into surface contact with the mating terminal 71 instead of point contact. Furthermore, as shown in the modification of FIG. 6, the recess 53B ₂ may be provided only in the vicinity of the contact portion with the mating terminal 71, and the other portion may be a notch 53E. From the viewpoint of stress distribution, it is not always necessary to provide a recess in the vicinity of the bent portions 53D and 53D ′ between the base (main body) 52A and the contact pieces 53 and 53 ′, and even the notch 53E has a sufficient effect. Can be obtained. However, as shown in FIGS. 2 and 5, etc., when the stress is distributed by the recesses, the durability of the spring is improved compared to the case where the stress is distributed by notches as shown in FIG. In addition, the spring force can be maintained. Other examples are not particularly illustrated, but, for example, a curved concave portion and a notch may be combined, or a V-groove having an inner surface that is flat rather than curved may be used. In the case of the V groove, the contact portion with the mating terminal is the edge of the recess shown in FIG. 4 or the like, or a flat slope.

  FIG. 7 shows a board-mounted coaxial connector 10 'in the same manner as in FIG. In this figure, the same reference numerals are given to the same members as in FIG. The main difference between the embodiment of FIG. 7 and the embodiment of FIG. 1 is that, in the embodiment of FIG. 7, the rear end 62 of the terminal 51 ′ is suitable for connection to a signal path (not shown) of the substrate 11. Thus, the outer conductor 58 is extended to the same position as the outer lid portion 60 and is formed flat. The outer lid 60 is connected to a ground path (not shown) on the substrate, and the rear end 62 is connected to a signal path. Other points may be considered similarly to the embodiment of FIG. Therefore, detailed description is omitted.

  Although the embodiment of the present invention has been described by taking a terminal provided with two contact pieces as an example, for example, the vicinity of the center of the front overhanging portion (52B) of the terminal extends forward, and this extended portion is connected to other terminals. Similar to the contact pieces, three contact pieces extending from the left and right side edges and the front edge can be provided by bending downward so as to form a tongue piece. Therefore, the present invention is not limited to two contact pieces.

  It can be widely applied to various connector terminals as well as coaxial cables.

It is sectional drawing of the coaxial connector as an example by this invention. It is a perspective view of the terminal used for a coaxial connector. It is a side view which shows the contact state between terminals. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a figure which shows the modification of a terminal. It is a figure which shows the modification of a terminal. It is a figure which shows a board | substrate installation type coaxial connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coaxial connector 11 Board | substrate C Coaxial cable C1 Outer skin C2 Shield wire C3 Dielectric C4 Center conductor 50 Connector 51 Terminal 51A Terminal 51B Terminal 52 Connection part 52A Base part 52B Front extension part 52C Back extension part 52D ', 52D''Wall part 52E Slit 52F Step 53 Contact piece 53A Opposing surface (contact surface)
53B Concavity 53B ₁ Curved Concavity 53B ₂ Concave 53C ₁ , 53C ₂ Edge 53D Bending Part 53E Notch 54 Insulator 54A Base 54B Main Body 54C Inner Lid 55A Hollow Hole 55B Upper Surface 57 Flat Plate 58 External Conductor 59 Cylindrical Part 59B annular inner protrusion 60 outer lid part 61 annular space 62 rear end part 70 mating connector 71 mating terminal 72 insulator 73 external conductor 71A contact part 71B connecting part 73A cylindrical part 73B annular constriction

Claims (6)

A plurality of plate-like contact pieces extending in a fitting direction with the counterpart terminal so as to sandwich the counterpart terminal, the center position of at least one flat contact surface of the plurality of contact pieces, and at least In the contact portion with the mating terminal, a recess is formed along the fitting direction, and a terminal,
An insulator for holding the terminal;
And an outer conductor that houses the insulator.   The coaxial connector according to claim 1, wherein the plurality of contact pieces are tapered along the fitting direction.   The coaxial connector according to claim 1, wherein the contact piece is formed so as to be bent from a main body of the terminal, and the concave portion is provided from the vicinity of the bent portion to the contact portion.   The coaxial connector according to any one of claims 1 to 3, wherein the contact piece is formed so as to be bent from a main body of the terminal, and a notch is provided in the vicinity of the bent portion.   The coaxial connector according to claim 1, wherein an inner surface of the recess is curved.   A plurality of plate-like contact pieces extending in a fitting direction with the counterpart terminal so as to sandwich the counterpart terminal, the center position of at least one flat contact surface of the plurality of contact pieces, and at least A coaxial connector terminal, wherein a concave portion is formed in the contact portion with the mating terminal along the fitting direction.

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