JPH0775179B2 - Co-listening equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a co-listening device used for co-listening to television broadcasting.

[Background Art] In the conventional co-listening device of this type, when electrically connecting the contactor on the ground side of the receptacle and the shield plate, the contactor of the receptacle is mounted on the printed circuit board to form the printed circuit board and the shield plate. Were to be connected by soldering or the like. Therefore, when an external force acts on the shield plate, solder cracking or the like occurs, and the connection state becomes unstable.

[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to stabilize the connection state between the contactor on the ground side of the receptacle and the shield plate, and to improve the high frequency characteristics. It is to provide a stabilized co-listening device.

DISCLOSURE OF THE INVENTION A co-listening device according to the present invention has a box-shaped cover having a receptacle that can be connected to a plug on the front surface and an opening on the rear surface, and a box-shaped cover that is integrally connected to the cover so as to close the rear opening. A shield plate, a substrate having a conductive portion connected to a contact on the ground side of the receptacle, and a conductive spring piece having one end connected to the conductive portion of the substrate and the other end elastically contacting the shield plate. And a conductive spring piece electrically connected to the contactor on the ground side of the receptacle is elastically contacted with the shield plate, so that the contactor on the ground side of the receptacle and the shield plate are The electrical connection state of is stabilized.

(Embodiment) As shown in FIG. 1, a casing 1 is formed by a box-shaped cover 2 whose rear surface is open and a shield plate 3 which closes the rear surface of the cover 2. The cover 2 is integrally formed of an insulating material such as synthetic resin, and is set to have the same size as a standardized ready-made wiring device module. Engaging projections are provided on the rear parts of the left and right side surfaces of the cover 2, respectively.
45 is provided so as to project, and the front edge of the engagement projection 45 is V-shaped. A step portion 46 is formed at a front portion on both left and right sides of the cover 2, and a connecting recess 47 that is opened to the side is formed in the step portion 46. Further, a pair of left and right engaging claw pieces 48 are provided on both left and right edges of the cover 2 so as to project. A receptacle 11 to which a plug connected to an end of a cable such as a coaxial cable can be connected is formed at the center of the front surface of the cover 2. The receptacle 11 is formed in a recess 12 having a circular cross section formed in the center of the front surface of the cover 2. On the bottom surface of the recess 12, a cylindrical support cylinder 13 concentric with the recess 12 is projected. An outer contact 14 formed by bending a conductive sheet metal is arranged around the support cylinder 13, and a pair of connecting legs 15 are extended from a rear edge of the outer contact 14. However, the outer conductor of the plug inserted into the receptacle 11 is inserted between the inner peripheral surface of the recess 12 and the outer peripheral surface of the support cylinder 13 and comes into pressure contact with the outer peripheral surface of the outer contactor 14. On the other hand, an insertion hole 16 is formed in the center of the front surface of the support cylinder 13, and the inner conductor of the plug is inserted into the insertion hole 16. An inner contactor 17 formed by bending a sheet metal into a cylindrical shape is installed in the support cylinder 13, and the inner conductor of the plug is inserted into the inner contactor 17 and electrically connected to the inner contactor 17. It is. A connecting leg 18 is integrally projectingly provided on the inner contactor 17. Outer contact
The connection legs 15 and 18 of 14 and the inner contactor 17 are connected to the conductive parts of the printed circuit board 19 arranged in the cover 2. Inner contact
The conductive portion of the printed circuit board 19 connected to 17 is connected to two terminal springs 20 having a pair of contact spring pieces 21. Further, the connection leg 15 of the outer contactor 14 is connected to the conductive spring pieces 71 provided at the four corners of the printed circuit board through the conductive parts of the printed circuit board. The conductive spring piece 71 is a pair of press-fitting legs 72.
The press-fitting leg 72 is press-fitted into the printed circuit board 19 so that the conductive spring piece 71 is mechanically fixed to the printed circuit board 19 and is electrically connected to the conductive portion.
Both contact spring pieces 21 of each terminal spring 20 are in elastic contact with each other by exerting a spring force in a direction toward each other. Both terminal springs 20 are respectively inserted into a pair of cylindrical portions 23 of an insulating frame 22 housed in the cover 2. The insulating frame 22 is formed of an insulating material such as a synthetic resin, and has a brim piece around a pair of rectangular tubular portions 23.
It is formed in a shape having 24. The shield plate 3 has engaging rings 31 extending from the central portions of the left and right side edges, respectively, and contact pieces 32 are provided at the four corners of the shield plate 3 at positions corresponding to the conductive spring pieces 71 of the printed circuit board 19 at the front. It has been extended. As shown in FIG. 2, cover the coupling ring 31 with the cover 2.
The engaging projection 45 formed around the engaging projection 45 is engaged with the engaging projection 45, and the periphery of the engaging ring 31 is caulked so as to be recessed in accordance with the front edge of the engaging projection 45. And the shield plate 3 are integrally connected. Further, as shown in FIG. 3, the conductive spring piece 71 is elastically contacted with the contact piece 32, whereby the outer contactor 14 which is the contactor on the ground side of the receptacle 11 and the shield plate 3 are electrically conductive spring piece. It is electrically connected via 71. Both tube parts 23 of the insulating frame 22
A notch 33 is formed in the shield plate 3 at a position corresponding to, and a pair of holding pieces 34 that are bent backward are formed at both left and right edges of the notch 33. A holding groove 35 is formed in the holding piece 34, and a shaft leg extended from a pressing plate 36 is formed in the holding groove 35.
37 is inserted. The shaft leg 37 is bent into an L shape, and the pressing plate 36 is held openably and closably with respect to the shield plate 3.
An insertion hole 38 is formed in the pressing plate 36, and a fixing screw 39
Through the through hole 38 and the ring 41 to the screw hole of the shield plate 3.
By being screwed into 40, the pressing plate 36 becomes the shield plate 3.
It is supposed to be fixed against. That is, the terminal 4 is connected to the printed circuit board as shown in FIGS.
The terminal spring 20 connected to the inner contactor 17 via 19 and the shield plate 3 connected to the outer contactor 14 via the printed circuit board 19.
Since the holding plate 36 is openably and closably held, the terminal spring 20 and the holding plate 36 are insulated from each other by the insulating frame 22. However, in order to connect the coaxial cable 5 to the terminal 4, the central conductor 51 of the coaxial cable 5 is inserted through the insertion hole 28 formed in the rear surface of the tubular portion 23 of the insulating frame 22 with the pressing plate 36 open. After being sandwiched between the contact spring pieces 21, the base portion of the central conductor 51 is bent so as to be parallel to the shield plate 3, and then the pressing plate 36 is closed to close the outer conductor.
The fixing screw 39 may be screwed onto the shield plate 3 while the 52 is sandwiched between the shield plate 3 and the pressing plate 36. Here, the pressing plate 36 is formed so that the two coaxial cables 5 can be simultaneously held.

With the above configuration, the outer contactor 14 and the inner contactor are assembled during assembly.
17 and 17 can be mounted from the front of the cover 2, and the other parts can be assembled sequentially from the rear of the cover 2, so that the assembly work is simplified. Further, since each component is mounted on the printed circuit board 19, the position of the component is stable.

Since this co-listening device is formed to have the same size as one ready-made wiring fixture module, as shown in FIG. 5, it should be mounted on a wall surface using a mounting frame 60 for mounting the wiring fixture module. Can be done. That is, the mounting frame 60 and the upper and lower mounting pieces 61, which are synthetic resin molded products, are formed with mounting holes 62 that are long in the left and right directions. This mounting hole 62
A box screw for fixing the mounting frame 60 to the embedded box or the like embedded in the wall surface is inserted therethrough. Further, a decorative plate is mounted on the front surface of the mounting frame 60, and the decorative plate is fixed to the mounting frame 60 by plate screws screwed into the screw holes 63 formed in the mounting piece 61. There is.
An engaging claw piece formed on the cover 2 is provided on the left vertical frame 65 of the mounting frame 60.
A coupling hole (not shown) with which the 48 engages is formed. Also,
The right vertical frame 66 has an opening at a position corresponding to the coupling claw piece 48 having an L-shaped cross section, and a release piece 67 is formed in the opening. An operation protrusion 68 is provided on the release piece 67, and holding holes 69 are formed on both sides of the operation protrusion 68. However, the casing 1 can be attached to the attachment frame 60 by inserting the coupling claw pieces 48 provided in the cover 2 into the left and right holding holes 69 of the attachment frame 60. To remove the casing 1 from the mounting frame 60, the operating projection 68 may be pryed with the tip of the driver or the like. As the mounting frame 60, it is also possible to use an off-the-shelf metallic mounting frame in which a projecting piece that can be inserted into the coupling recess 47 is provided on the inner peripheral edge.

[Effects of the Invention] As described above, the present invention has a box-shaped cover having a receptacle that can be connected to a plug on the front surface and an opening on the rear surface, and is integrally connected to the cover by closing the opening on the rear surface of the cover. A shield plate, a substrate having a conductive portion connected to the ground-side contact of the receptacle, and a conductive spring piece having one end connected to the conductive portion of the substrate and the other end elastically contacting the shield plate. Since the conductive spring piece electrically connected to the contact on the ground side of the receptacle is elastically contacted with the shield plate, the conductive spring piece will not be affected even if an external force acts on the shield plate. The elastic contact with the shield plate has the advantage that the electrically connected state between the contact on the ground side of the receptacle and the shield plate can be maintained, and the connected state can be stabilized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a side view of an essential part of the same, FIG. 3 is a sectional view of an essential part of the same, and FIG. Fig. 5 is a sectional view of the main part of the above, No. 6
The figure is a perspective view showing a state where the same is mounted on a mounting frame. Reference numeral 1 is a casing, 2 is a cover, 3 is a shield plate, 11 is a receptacle, 19 is a printed circuit board, 32 is a contact piece, and 71 is a conductive spring piece.

Claims (2)

[Claims] 1. A box-shaped cover having a receptacle that can be connected to a plug on the front surface and an opening on the rear surface, a shield plate that is integrally connected to the cover so as to close the opening on the rear surface of the cover, and the grounding of the receptacle. And a conductive spring piece having one end connected to the conductive part of the substrate and the other end elastically contacting the shield plate. And co-listening equipment. 2. The shield plate is provided with contact pieces projecting forward at four corners, the shield plate is attached to the cover by inserting the contact pieces into the cover, and one end portion of a conductive spring piece provided on the substrate. The co-listening device according to claim 1, wherein the contact piece is elastically contacted with the contact piece.