JP4870951B2 - Plug for coaxial cable - Google Patents

Description

  The present invention relates to a coaxial cable plug that transmits a high-frequency signal.

  A television receiver has a high-frequency input terminal for inputting a signal received by an antenna, and a plug is generally used as the high-frequency input terminal. A signal received by the antenna is guided to a television receiver using a coaxial cable and connected to the television receiver by a plug. However, since the plug is expensive and the connection operation is troublesome, it is generally performed to connect to the plug on the television receiver side using a coaxial cable plug that is simply configured. (For example, refer to Patent Document 1).

Recently, a coaxial cable plug has been used as a container for a molded case made of a resin that can be freely opened and closed on one side for ease of manufacturing, and a shield case is provided in the mold case. Provide a shield cover on the lid side, connect the center conductor of the coaxial cable to the connection terminal of the plug in the shield case, and then cover the shield case when closing the cover of the mold case, External waves are prevented from entering from the connection.
Japanese Utility Model Publication No. 55-61378

  As described above, the conventional coaxial cable plug is shielded by covering the shield case with the shield cover when closing the cover of the mold case, but the electrical connection between the shield case and the shield cover is not sufficient. In particular, it is difficult to reliably shield on the coaxial cable insertion port side, and there is a possibility that external waves that interfere with high-frequency signals may be mixed.

  The present invention has been made to solve the above-described problems, and when the cover of the plug case is closed, the shield cover and the shield case can be securely connected to each other, and the high frequency signal is disturbed. An object of the present invention is to provide a coaxial cable plug that can prevent the introduction of external waves.

A plug for a coaxial cable according to a first aspect of the present invention includes a plug case having an upper surface opened, a case cover that is integrally connected to one side of the opening side of the plug case by a hinge portion, and is openable and closable, A cable holding fitting to be attached to the plug case and a cable holding metal connected to the cable holding fitting, and shield surfaces are formed on both sides and the back side, and the cable is drawn into the surface on the cable holding fitting side facing the back side. A shield case with an upper surface opening formed with shield cover guides on both sides of the opening for opening, a substantially cylindrical outer conductor terminal mounted on the bottom surface of the shield case and provided to protrude outward from the plug case; The central conductor of the coaxial cable, which is provided in an insulated state in the shield case and is held by the cable holding bracket, is maintained. A central conductor holding portion, a central conductor terminal connected to the central conductor holding portion and disposed on a central axis of the outer conductor terminal, and the case cover side corresponding to the upper surface opening of the shield case A shield cover provided on the upper edge of each of the front and rear and left and right shield surfaces around the shield cover, when the case cover is closed, the shield surface on both sides and the back of the shield case and the shield cover guide A contact point, and the contact point bends the upper edge of the shield surface around the shield cover, and the upper edge of the shield surface protrudes outward, and the upper end is inward. characterized Rukoto is formed to have a tapered shape.
According to a second aspect of the present invention, in the coaxial cable plug according to the first aspect, the shield cover is provided with slits at the front and rear of the cover and at the corners of the left and right shield surfaces.
According to a third aspect of the present invention, in the plug for coaxial cable according to the first aspect , the central conductor holding portion is screwed to the fixed substrate for connecting the cable connected to the central conductor terminal and the fixed substrate. A center conductor holding case made of an insulator is provided so as to surround the fixed substrate and the screw.

  According to the present invention, the shield cover guide is provided in the shield case that shields the central conductor holding portion, and the plug case cover is closed by providing the shield cover and the contact that contacts the shield cover guide on the shield cover side. At this time, the electrical connection between the shield cover and the shield case can be reliably performed, and mixing of external waves that interfere with the high-frequency signal can be prevented.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a coaxial cable plug 10 according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which a mold case cover is opened. 3A and 3B show details of the shield case and the cable holding metal part. FIG. 3A is a plan view, FIG. 3B is a view seen from the cable holding metal side, and FIG. FIG. 4 is a diagram showing the relationship between the shield case and the shield cover.

  1 to 4, 11 is a plug case, for example, a mold case molded using a synthetic resin, and 12 is a mold case cover. The mold case cover 12 is connected to one side of the mold case 11 so as to be freely opened and closed. For example, the mold case 11 and the mold case cover 12 are integrally formed by a thin hinge 13 at the center of one side, and can be opened and closed in a laterally open manner. The mold case cover 12 is formed with a locking piece 14 on the side opposite to the hinge portion 13, and the mold case 11 is formed with a recess 15 at a portion corresponding to the locking piece 14. The locking piece 14 has a tapered protrusion 16 at the tip, and the protrusion 16 of the locking piece 14 is located at the concave portion 15 of the mold case 11 when the mold case cover 12 is closed with respect to the mold case 11. It is designed to be locked. With the mold case cover 12 closed, the locking state is released by applying an outward force to the tip of the locking piece 14, and the mold case cover 12 can be opened.

  The mold case 11 and the mold case cover 12 are formed with substantially semicircular cable insertion holes 17a and 17b at one end, respectively. Further, as shown in FIG. 1, a hole 18 for inserting an outer conductor terminal 23a described later is formed on the surface of the mold case 11 at a position away from the cable insertion hole 17a. In the mold case 11, the terminal unit 20 is attached to the hole 18.

  The terminal unit 20 includes a shield case 21 having an opening on the top surface, a cable holding bracket 22, a terminal portion 23 for connecting to an external plug, and a central conductor holding case made of synthetic resin provided in the shield case 21. It consists of 24. The cable holding bracket 22 is for holding the coaxial cable 61 inserted from the outside, is provided integrally with the shield case 21, and is disposed in the mold case 11 in the vicinity of the cable insertion hole 17a. The cable holding metal fitting 22 is substantially U-shaped and has an open end wide, and a protruding claw 25 for holding the coaxial cable 61 is formed on the upper end portion or the like. The coaxial cable 61 is provided with an outer conductor 64 made of a braided wire on the outer side of the central conductor 62 via an insulator 63, and an outer sheath 65 is provided on the outer side of the outer conductor 64.

  The terminal portion 23 includes a cylindrical outer conductor terminal 23a and a pin-shaped center conductor terminal 23b provided on the central axis thereof. The outer conductor terminal 23 a is provided so as to protrude from the hole 18 of the mold case 11 to the outside. The outer conductor terminal 23a is formed in accordance with the diameter of the threaded portion of the plug to which the diameter of the portion formed in the cylindrical shape is connected, and the slit 26 is formed along the side portion. That is, the outer conductor terminal 23a is made elastic by forming the slit 26 so that the outer conductor terminal 23a can be securely attached to the screw portion of the plug.

  The shield case 21 and the cable holding bracket 22 are integrally provided as shown in FIG. The shield case 21 is provided with a substantially circular hole 31 at the center, and holding holes 32 a and 32 b for holding the outer conductor terminals 23 a on both sides of the hole 31. Two protrusions (not shown) formed at the upper end of the outer conductor terminal 23a are inserted into the holding holes 32a and 32b from the lower side of the shield case 21 and fixed.

  A part of the center conductor holding case 24 is inserted into the hole 31 provided in the shield case 21, but a part of the hole 31 bulges toward the cable holding bracket 22 side so that the insertion position is determined at a predetermined position. Is given.

  The shield case 21 is provided with shield surfaces 41 on both sides and the back, and shield cover guides 42a and 42b are provided on both sides on the cable holding bracket 22 side. An opening is provided between the shield cover guides 42a and 42b for drawing the coaxial cable.

  And in the shield surface 41 located on both sides of the shield case 21, a horizontal cut is made at the center, a short cut is made at both ends, and the upper end of the cut protrudes outward. Protrusions 33a and 33b are formed. By forming these protrusions 33a and 33b, a recess is formed in the shield case 21. The central conductor holding case 24 is mounted in the shield case 21 using this recess. The center conductor holding case 24 has a support frame formed along the outer periphery of the lower portion, and a protrusion (not shown) formed on the support frame is formed in a recess formed inside the protrusions 33a and 33b. Engage with each other in the shield case 21.

  In the center conductor holding case 24, a center conductor holding portion 28 for holding the center conductor 62 of the coaxial cable 61 is disposed. The central conductor holding portion 28 is provided in a state insulated from the shield case 21 by the central conductor holding case 24. A groove 29 is formed on the cable holding bracket 22 side in the center conductor holding case 24, and the center conductor 62 of the coaxial cable 61 is inserted into the center conductor holding portion 28 from the groove 29 portion. The center conductor holding portion 28 has a screw 34 with a washer screwed to a fixed board (not shown) for cable connection. By tightening the screw 34 with the washer, the center conductor 62 of the coaxial cable 61 is connected to the center conductor 62. It is designed to be fixed between a fixed substrate. A pin-shaped central conductor terminal 23 b in the terminal portion 23 is integrally connected to the fixed substrate of the central conductor holding portion 28, and when the terminal unit 20 is attached to the mold case 11, the central conductor terminal is provided. 23b is located along the central axis of the outer conductor terminal 23a.

  When the terminal unit 20 is attached to the mold case 11, the shield case 21 is fitted along the inner wall surface of the mold case 11. In this case, the protrusions 33 a and 33 b formed on the shield surface 41 of the shield case 21 are fitted into the recesses 19 (see FIG. 1) formed on the side portions in the mold case 11.

  On the other hand, a shield cover 43 is fitted to the mold case cover 12 so as to correspond to the shield case 21. The mold case cover 12 is formed with a plurality of, for example, two columnar fitting projections 44, and through holes provided in the shield cover 43 are fitted.

  The shield cover 43 is provided with slits 47 at the respective corners of the front and rear and left and right shield surfaces 46, and each shield surface 46 is made independent to have elasticity. Further, each shield surface 46 is bent at the upper edge, and contacts 48a and 48b are formed so that the bent portion protrudes outward and the upper end is tapered inward. , 49a to 49c are formed. In this case, 48a and 48b are contacts provided on the shield surface 46 on the front surface side, and 49a to 49c are contacts provided on the shield surfaces 46 on both sides and the back surface.

  The shield surface 46 on the front side is formed with an elliptical semicircular open surface 50 for drawing a coaxial cable at the upper center, and the contacts 48a and 48b are provided above both ends. Further, the contacts 49a to 49c formed on the shield surfaces 46 on the other sides and the back surface are each divided into two by a cut 51 provided in the central portion.

  The shield cover 43 is sized so that the contacts 48 a, 48 b, 49 a to 49 c come into contact with the shield cover guides 42 a and 42 b provided on the shield case 21 and the shield surface 41 when the mold case cover 12 is closed. Is set.

  As described above, the shield cover 43 is provided with the contacts 48a, 48b, and 49a to 49c for all the shield surfaces 46 on the front and rear sides and on both sides. In this case, the contacts 48a and 48b provided on the shield surface 46 on the front side correspond to the shield cover guides 42a and 42b provided on the shield case 21 as shown in FIG. That is, when the mold case cover 12 is closed with respect to the mold case 11, the shield cover 43 is positioned on the upper opening surface of the shield case 21, and the contacts 48 a, 48 b formed on the shield surfaces 46 of the shield cover 43, 49 a to 49 c are in pressure contact with the shield cover guides 42 a and 42 b and the shield surfaces 41 of the shield case 21.

  Then, the coaxial cable plug 10 configured as described above opens the mold case cover 12 and attaches the coaxial cable 61 to the mold case 11 as shown in FIG.

  When the coaxial cable 61 is attached to the coaxial cable plug 10, the center conductor 62 and the outer conductor 64 are exposed for a predetermined length. In this case, the outer conductor 64 is folded back as necessary. In the coaxial cable 61, the exposed portion of the outer conductor 64 is positioned on the cable holding bracket 22 in the mold case 11, and the tip of the center conductor 62 is a groove provided in the center conductor holding case 24 of the mold case 11. 29 is inserted into the center conductor holding portion 28, and a screw 34 with a washer is fastened and fixed. Further, the upper open end side of the cable holding bracket 22 is clamped with, for example, pliers to fix the outer conductor 64 portion of the coaxial cable 61, and at the same time, the outer conductor 64 is electrically connected to the cable holding bracket 22. As a result, the outer conductor 64 of the coaxial cable 61 is grounded via the cable holding bracket 22.

  Thereafter, the mold case cover 12 is closed with respect to the mold case 11. At this time, the shield cover 43 is positioned on the upper opening surface of the shield case 21, and the contacts 48 a, 48 b, 49 a to 49 c formed on the shield surfaces 46 of the shield cover 43 are the shield cover guides 42 a, 42 b of the shield case 21 and the shield. Press contact with the inside of the surface 41. As a result, the shield case 21 and the shield cover 43 are electrically connected, and the center conductor holding portion 28 is reliably shielded together with the center conductor holding case 24.

  Further, when the mold case cover 12 is closed with respect to the mold case 11, the locking piece 14 formed on the mold case cover 12 is inserted into the recess 15 of the mold case 11 and locked.

  FIG. 5 shows the shielding characteristic of the coaxial cable plug 10 configured as described above, and the horizontal axis represents frequency (MHz) and the vertical axis represents shielding characteristic (dB). The shield characteristic a of the coaxial cable plug 10 in FIG. 5 is that the conventional coaxial cable plug, that is, the shield case 21 is not provided with the shield cover guides 42a and 42b, and the shield cover 43 has a contact 48a, The comparison data when the shield characteristic b of the coaxial cable plug not provided with 48b is set to 0 dB is shown. FIG. 5 shows that the higher the numerical value on the vertical axis, the better the shielding characteristics.

  The coaxial cable plug 10 according to the above embodiment is particularly high in the frequency bands of 1.5 GHz, 2 GHz, and 2.5 GHz used in mobile phones and PHS, as is apparent from the shield characteristics of FIG. A shielding effect was obtained.

  According to the embodiment, the shield cover guides 42 a and 42 b are provided on the shield case 21 that shields the central conductor holding portion 28, and the shield surface 41 of the shield case 21 and the shield cover guide 42 a are provided on the shield surface 46 of the shield cover 43. , 42b is provided with contact points 48a, 48b, 49a-49c, so that when the mold case cover 12 is closed, the shield cover 43 and the shield case 21 can be reliably electrically connected to each other. It is possible to prevent external waves from being disturbed.

  The coaxial cable plug 10 is used, for example, when a coaxial cable is connected to an antenna connection terminal (plug) of a television receiver, or when a coaxial cable is connected to a television signal input terminal of a personal computer equipped with a television reception function. Can be used.

  In the above-described embodiment, the case where the mold case 11 and the mold case cover 12 are configured to be opened and closed in a laterally open manner has been described. However, for example, the mold case 11 and the mold case cover 12 may be opened and closed in a vertically opened manner.

  Further, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

It is a disassembled perspective view of the plug for coaxial cables which concerns on one Embodiment of this invention. It is a figure which shows the state which opened the mold case cover in the embodiment. The details of the shield case and cable holding metal part in the same embodiment are shown, (a) is a plan view, (b) is a view seen from the cable holding metal side, (c) is a side view. It is a figure which shows the relationship between the shield case and shield cover in the embodiment. It is a figure which shows the shield characteristic in the same embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Plug for coaxial cables, 11 ... Mold case, 12 ... Mold case cover, 13 ... Hinge part, 14 ... Locking piece, 15 ... Recessed part, 16 ... Projection part, 17a, 17b ... Cable insertion hole, 18 ... Hole, DESCRIPTION OF SYMBOLS 19 ... Concave part, 20 ... Terminal unit, 21 ... Shield case, 22 ... Cable holding metal fitting, 23 ... Terminal part, 23a ... Terminal for outer conductor, 23b ... Terminal for center conductor, 24 ... Center conductor holding case, 25 ... Claw, 26 ... Slit, 28 ... Center conductor holding part, 29 ... Groove, 31 ... Hole, 32a, 32b ... Holding hole for terminal for outer conductor, 33a, 33b ... Projection, 34 ... Screw with washer, 41 ... Shield surface, 42a 42b ... shield cover guide, 43 ... shield cover, 44 ... fitting projection, 46 ... shield surface, 47 ... slit, 48a, 48b, 49a to 49c ... contact, 50 ... open , 51 ... notch, 61 ... coaxial cable, 62 ... center conductor, 63 ... insulator, 64 ... outer conductor, 65 ... outer coating.

Claims (3)

A plug case having an upper surface opened; a case cover that is integrally connected to one side of the opening side of the plug case by a hinge portion and is provided so as to be openable and closable; a cable holding fitting attached to the plug case; A shield cover guide is formed on both sides of the opening for drawing the cable on the surface of the cable holding bracket side opposite to the back surface, and a shield surface is formed continuously with the cable holding bracket. A shield case with an upper surface opening formed on the bottom surface of the shield case, a substantially cylindrical outer conductor terminal provided to protrude outside from the plug case, and an insulating state in the shield case; A center conductor holding portion for holding a center conductor of a coaxial cable held by the cable holding bracket, and the center conductor holding To be continuously provided, and the center conductor terminal arranged on the central axis of the outer conductor terminal, and a shield cover provided on the casing cover side corresponding to the upper opening of the shield case, around the shield cover Formed on the upper edge of each of the front and rear and left and right shield surfaces, and comprises contact points that contact the shield surfaces on both sides and the back surface of the shield case and the shield cover guide when the case cover is closed , folding the upper edge of each shield surfaces of the front and rear and left and right around the shield cover, so that occasion bent portion is positioned to protrude outward, and the Rukoto formed such upper end tapers inwardly Features a plug for coaxial cable. 2. The shield cover provided on the case cover side corresponding to the upper surface opening of the shield case is provided with a slit at each corner of the front and rear and the left and right shield surfaces around the cover. Plug for coaxial cable as described in 1.   The center conductor holding portion, which is provided in an insulated state in the shield case and holds the center conductor of the coaxial cable held by the cable holding bracket, is fixed for cable connection provided continuously to the center conductor terminal. 2. The coaxial cable according to claim 1, further comprising a central conductor holding case made of an insulating material so as to surround the fixed substrate and the screw. Plug.

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