JPH0754719B2 - High frequency signal connection unit - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a connection unit for relaying, terminating, demultiplexing, branching or distributing high frequency signals, which facilitates connection of coaxial cables and has improved high frequency characteristics.

[Prior art]

Conventionally, in a high-frequency signal transmission system such as a CATV system, a series unit for extracting a high-frequency signal at each customer end, a distributor, a branching device, a demultiplexing filter, etc. have been used. These devices are installed in a storage case installed inside the wall surface of the consumer in the same manner as the method of installing an outlet for a power line, or installed at the entrance of the consumer. Taking the series unit as an example of the above-mentioned devices, one type of conventional series unit is configured as shown in FIG. Reference numeral 90 is a consumer terminal that outputs a high frequency signal to the consumer, and is an F-type connector seat. This customer terminal 90 has a hole
A decorative plate 91 is provided so as to be stored in 910. A metal base 93 bent in a U-shape is fixedly provided on the back of the decorative plate 91, and a printed circuit board 95 is supported on both ends of the base 93. An ohmic band 96a is provided on the upper surface 93a of the base 93, and the lower surface 9a of the base 93 is similarly arranged.
Also in 3b, an ohmic band is arranged at a position that cannot be seen in the drawing. Further, center conductor connecting terminals 97a, 97b are disposed on the upper surface and the lower surface of the decorative plate 91, and the terminals 97a, 97b are insulated from the base 93, and the high-frequency signal input terminal and output of the printed board 95 are provided. It is connected to the terminal. The open side of the base 93 is covered with a metal case 94 that is bent in a "U" shape.

Problems to be Solved by the Invention Connection of a coaxial cable to such a series unit is performed as follows. The outer cover is cut off at the tip of the coaxial cable, the exposed outer conductor is folded back to the outer cover to expose the insulator, and the exposed insulator is removed to expose the center conductor. The coaxial cable thus terminated is placed at a position where the folded back outer conductor comes into contact with the ohmic band 96a or the like, and is fixed by the band 96a or the like. Then, the center conductor is screwed and fixed to the center conductor connecting terminal 97a or the like. Conventionally, since the coaxial cable is terminal-treated and connected as described above, there is a problem that the mounting is complicated.
Further, in the connecting portion, the central conductor connecting terminals 97a and 97b are exposed, and the central conductor of the coaxial cable is connected between the ohmic band 96a and the ohmic band not visible in the drawing to the central conductor connecting terminals 97a and 97b. Is exposed. For this reason, television radio waves jump in at this connection portion, causing a ghost failure. The present invention has been made to solve the above problems, and an object thereof is to easily connect a coaxial cable in a high-frequency signal connection unit, and to firmly fix the cable to a sleeve, It is to prevent diving and electric wave leakage.

[Means for Solving the Problems]

The structure of the invention for solving the above-mentioned problems is constituted by a box-shaped metal case and a cylindrical conductor standing on the side surface of the metal case, and the central hollow portion is insulated from the central conductor and the insulation of the coaxial cable. A sleeve inserted between the insulator of the coaxial cable and the outer conductor so that the body penetrates and the inner surface of the outer conductor contacts the outer surface of the side wall, and both sides of the side wall of the sleeve around the sleeve. A pair of ohmic bands that sandwich the sleeve at a predetermined distance from each other, a fixing means that holds at least one end of the pair of ohmic bands and is disposed in a metal case, and a pair of ohmic bands with respect to the sleeve. A pair of ohmic bands at the end opposite to the one end held by the elastic member that biases the pair of ohmic bands substantially in a symmetrically maintaining direction and the pair of ohmic band fixing means. It is to provided a clamping means for tightening against sleeve. Further, another invention is characterized in that, in addition to the above configuration, when the metal case is covered with a design case, the fixing means is arranged in the design case.

[Action]

The high-frequency signal connection unit of the present invention has a box-shaped metal case and a cylindrical sleeve provided upright on the side surface of the metal case. The sleeve is then fitted between the insulator of the coaxial cable and the outer conductor. As a result, the center conductor of the coaxial cable is completely covered outside the metal case by the sleeve that is in full contact with the outer conductor, and inside the metal case by the box-shaped metal case. Therefore, the shielding ability at the connection portion between the coaxial cable and the connection unit is improved, and the problems of radio wave intrusion and radio wave leakage are solved. Also, since the coaxial cable only needs to expose the central conductor at its tip and insert it into the sleeve, the outer conductor can be folded back or the mesh-shaped outer conductor can be caught by the ohmic band as in the conventional method. Since it does not, installation becomes extremely easy. Further, a pair of ohmic bands are arranged so as to sandwich the sleeve. One end of the ohmic band is fixed to a fixing means arranged in a metal case or a design case that covers the metal case. The pair of ohmic bands are urged by elastic means in a direction in which a certain interval is obtained about the sleeve. Therefore, since the pair of ohmic bands and the sleeve are provided at substantially equal intervals, the coaxial cable can be fitted into the sleeve without the pair of ohmic bands interfering. Next, by operating the tightening means, the pair of ohmic bands are moved in the direction of narrowing the gap with the sleeve.
As a result, the coaxial cable fitted in the sleeve is firmly fixed to the sleeve by the pair of ohmic bands.

【Example】

Hereinafter, the present invention will be described based on a specific example. First Embodiment FIG. 1 is a perspective view showing a serial unit according to a specific embodiment of the present invention, and FIG. 2 is a rear view of the serial unit with a back cover 12 removed. 10 is a rectangular parallelepiped box type metal case. Its metal case 10
A back cover 12 made of metal is fitted to the back side of the. Inside the metal case 10, a printed circuit board 13 having a branch circuit is arranged. The ground of the printed circuit board 13 is connected to the metal case 10. On the side surfaces 15 and 16 of the metal case 10, sleeves 20 and 30 of a cylindrical conductor that are electrically connected to the metal case 10 are provided upright. Further, on the front surface 17 of the metal case 10, a consumer connector 18 for outputting a signal to the consumer side is erected with the outer conductor of the ground connected to the metal case 10. The center conductor terminal of the consumer connector 18 is connected to the high frequency signal branch terminal of the printed circuit board 13. The sleeves 20 and 30 are erected on the metal case 10 as follows. In FIG. 3, a sleeve is provided on the side surface 15 of the metal case 10.
A hole 40 having a diameter through which the root portion 21 of 20 penetrates is formed. The sleeve 20 is penetrated through the hole 40 from the inside to the outside of the metal case 10, and the head 22 of the sleeve 20 is in contact with the inside of the side surface 15. The sleeve 20 is formed in a taper shape in which the outer diameter becomes smaller toward the tip, and the caulking ring has a diameter slightly smaller than the outer diameter of the root portion 21 of the sleeve 20.
50 is inserted from the tip of the sleeve 20. Then, by forcibly inserting the caulking ring 50 toward the side surface 15 of the metal case 10, the sleeve 20 is caulked by the caulking ring 50, and the sleeve 20 is closely attached to the side surface 15 of the metal case 10. On the other hand, the caulking ring 50 has an outer wall 51 extending in a tubular shape along the axis X of the sleeve 20. Also, as shown in FIG. 1, the side wall 15 of the metal case 10
A rail-shaped projection piece 1 made of metal is provided upright, and a communication hole 2 is formed in a fixing surface 1a of the projection piece 1.
Springs 4a and 4b are arranged between both sides of the fixed surface 1a and the ohmic bands 5a and 5b. The small screw 3a is a communication hole 6a formed in the ohmic band 5a, a spring 4a, and a fixed surface.
Through the communication hole 2 of 1a and the spring 4b, the ohmic band 5b
It is screwed into the screw hole 7a cut in the. As a result, the ohmic bands 5a and 5b are fixed to the protruding piece 1. On the other hand, small screw 3b
Penetrates the communication hole 6b formed in the ohmic band 5a and is screwed into the screw hole 7b formed in the ohmic band 5b. The small screws 3a and 3b are in a half tightened state before the coaxial cable is attached, and a front view of the metal case 10 seen from the direction in which the sleeve 20 is erected is as shown in FIG. The ohmic bands 5a and 5b are urged outward by the urging force of the springs 4a and 4b.
There is a centrosymmetrical gap between the sleeves 5a and 5b. Due to this gap, the sleeve of the coaxial cable in this state
It becomes easy to attach to 20. On the other hand, with respect to the sleeve 30, the attachment mechanism of the ohmic bands 5c and 5d similar to the above-described configuration has the same side wall 1
Formed in 6. Next, a method of connecting the coaxial cable to the sleeve 20 will be described. As shown in FIG. 5, the coaxial cable 60 has an outer cover at the tip.
61 and the outer conductor 62 are removed, leaving the insulator 63 exposed. Next, the insulator 63 is removed and the central conductor 64 is exposed. Next, the coaxial cable 60 whose tip is processed in this manner is fitted into the sleeve 20 as shown in FIG. That is,
The cylindrical sleeve 20 is fitted into the gap between the insulator 63 and the outer conductor 62. Therefore, the insulator 63 passes through the inside of the sleeve 20, and the outer conductor 62 is in contact with the outer wall of the sleeve 20. At this time, the outer conductor 62, which is partially exposed at the tip of the coaxial cable 60, is completely covered by the outer wall 51 of the caulking ring 50. The center conductor 64 extending inside the metal case 10 is connected to the input terminal 70 formed on the printed circuit board 13. Next, the small screws 3a, 3b are screwed into the screw holes 7a, 7b formed in the ohmic band 5b. As a result, the ohmic bands 3a, 3b clamp the outer sheath 61 and the outer conductor 62 of the coaxial cable 60 interposed between the sleeve 20 and the sleeve 20 to the sleeve 20. As a result, the coaxial cable 60 is sleeved.
It is firmly fixed to 20. In the tightened state, the ohmic bands 5a and 5b are in the state shown in FIG. A return 23 is formed at the tip of the sleeve 20, so that the coaxial cable 60 is not easily separated from the sleeve 20 together with the tightening action of the ohmic bands 5a and 5b. A coaxial cable is similarly connected to the sleeve 30. As described above, in the series unit of the present embodiment, it is possible to make connection very simply by exposing the central conductor of the coaxial cable. Further, since the outer conductor of the coaxial cable and the sleeve are in close contact with each other, the center conductor passes through the inside of the sleeve, and the metal case is formed into a rectangular parallelepiped box shape, the shield for the center conductor is complete, As described above, the harmful effects of radio wave dipping and radio wave leakage at the connection portion of the coaxial cable have been eliminated. The coaxial cable 60 is firmly fixed to the sleeve 20 by the fixing structure of the ohmic bands 5a and 5b as described above.
As shown in FIG. 4, since a and 5b are held with a sufficient gap around the sleeve 20, the coaxial cable
It becomes easy to insert the 60 into the sleeve 20. In the above embodiment, the fixing means is composed of the projection piece 1, the fixing surface 1a, the communication hole 2, the small screw 3a, the communication hole 6a, and the screw hole 7a. or,
The elastic member is composed of springs 4a and 4b. The tightening means is composed of a small screw 3b, a communication hole 6b, and a screw hole 7b. Second Embodiment As shown in FIG. 8, the series unit of the present embodiment is provided with a resin design case 19 so as to cover the metal case 10. A resin-made protrusion piece 1 is formed on a side surface 19 a of the design case 19. The fixing and tightening mechanism of the ohmic bands 5a and 5b is the same as in the first embodiment. Third Embodiment FIG. 9 is a plan view showing another structure of the ohmic band. As shown in FIG. 10, the ohmic bands 45a and 45b have a hinge 47 at the base, and the hinge 47 is held by a holder 41 standing on the side surface 19a of the design case 19. The holder 41 is provided with stoppers 41a, 41b for restricting the spreading direction of the ohmic bands 45a, 45b. Also, a small screw 4 is attached to the tip of the ohmic band 45a, 45b.
3 penetrates, and the small screw 43 is used as an axis for the spring 4
4 are arranged. The spring 44 urges the ohmic bands 45a and 45b in a direction in which they spread with each other. As a result, the ohmic bands 45a and 45b are spread symmetrically around the sleeve 20 until they come into contact with the stoppers 41a and 41b. In such a spread state, as described above, the coaxial cable 60
Is inserted into the sleeve 20. Then screw the small screw 43
By screwing onto the screw 46, the coaxial cable 60 is firmly tightened and fixed to the sleeve 20 by the pair of ohmic bands 45a and 45b. In the above embodiment, the fixing means is composed of the holder 41 and the hinge 47. The elastic means is composed of the spring 44. or,
The tightening means includes a small screw 43 and a nut 46. Further, as a modification of the above-described embodiment, a holding plate through which the small screw 43 penetrates is erected at the intermediate position of the small screw 43 on the side surface 19a of the design case 19, and the spring 44 is divided into two parts on both sides of this holding plate. It may be arranged. Fourth Embodiment Although the hinge 47 and the spring 44 are used in the third embodiment, as shown in FIG. 11, the ohmic band 55a,
55b may be formed by bending one long metal or resin having a strong spring property. The bent portion 55c is held by a holder 54 provided upright on the side surface 19a of the design case 19.
In this state, the ohmic bands 55a and 55b are urged in a mutually expanding direction by strong spring elasticity and are symmetrically expanded around the sleeve 20. In such a spread state, as described above, the coaxial cable 60
Is inserted into the sleeve 20. After that, ohmic band 55
A small screw 43 penetrating the tips of a and 55b is screwed to the nut 46. As a result, the coaxial cable 60 is firmly clamped and fixed to the sleeve 20 by the pair of ohmic bands 55a and 55b. In the above embodiment, the fixing means is composed of the holder 54. The elastic means is composed of the elasticity of the ohmic bands 55a and 55b. The tightening means includes a small screw 43 and a nut 46. Fifth Embodiment The ohmic bands 56a and 56b may be formed in the shape shown in FIG. The root parts 57a and 57b are formed of a material having strong spring elasticity. The root parts 57a and 57b are fixed pieces 4 which are erected on the side surface 19a of the design case 19 by means of small screws 58 and nuts 59.
It is fixed to 2. In this state, the spring elasticity of the root portions 57a and 57b urges the ohmic bands 56a and 56b in a direction in which they expand each other, so that the ohmic bands 56a and 56b are symmetrically expanded about the sleeve 20. In such a spread state, as described above, the coaxial cable 60
Is inserted into the sleeve 20. Then the Ohm band 56
A small screw 43 penetrating the tips of a and 56b is screwed into a screw hole 7c formed at the tip of the ohmic band 56b. As a result, the coaxial cable 60 is firmly tightened and fixed to the sleeve 20 by the pair of ohmic bands 56a and 56b. In the above embodiment, the fixing means is composed of the fixing piece 42, the small screw 58 and the nut 59. Also, the elastic means is an ohmic band 56
The root portions 57a and 57b of a and 56b are formed by spring elasticity.
The tightening means is composed of a small screw 43 and a screw hole 7c. Sixth Embodiment FIG. 13 is a view showing another method of attaching the sleeve. The sleeve 80 is manufactured in a cylindrical shape, and the root portion thereof has a shape in which the above-described caulking ring is integrally formed. Then, a male screw 81 is cut at the root part. Further, a nut 82 is attached to the back surface of the side surface 15 of the metal case 10. Then, the sleeve 80 is screwed and attached to the nut 82. Further, in FIG. 13, in addition to forming the male screw 81 on the base of the sleeve 80 and tightening it with the nut 82, the base of the sleeve 80 may be attached to the metal case 10 by simply caulking. Further, as shown in FIG. 14, holes 84 may be provided in the side wall of the sleeve 83. In this case, when tightening the coaxial cable 60 with the ohmic bands 5a, 5b, etc., the outer conductor 62 and the outer skin 61 project into the hole 84, which makes it more difficult to detach the coaxial cable 60. Although all of the above embodiments have been described with respect to the serial unit, a demultiplexing filter or the like that transmits a signal only in one direction may be used. Therefore, the number of sleeves for connecting the coaxial cable is arbitrary. Further, it is also possible that the consumer connector is not attached.

【The invention's effect】

The present invention is provided upright on the side surface of the metal case and has a sleeve composed of a cylindrical conductor, so that the sleeve can be inserted between the insulator of the coaxial cable and the outer conductor, The coaxial cable can be easily attached, and electric wave leakage and electric wave intrusion can be prevented. Further, the present invention, a pair of ohmic bands sandwiching the sleeve at a predetermined interval from both sides of the side wall of the sleeve around the sleeve, and a fixing means for holding at least one end of the pair of ohmic bands, An elastic member that biases the pair of ohmic bands with respect to the sleeve in a direction that substantially symmetrically maintains a constant distance, and an end opposite to one end held by the fixing means of the pair of ohmic bands,
And a fastening means for fastening the pair of ohmic bands to the sleeve. Therefore, without fixing the coaxial cable, the ohm type band is held in a state where the ohm type band is spread over each other around the sleeve, so that the ohm type band does not get in the way when the coaxial cable is attached to the sleeve. The workability of mounting is greatly improved. Further, since the coaxial cable is firmly fixed to the sleeve by the ohmic band, the coaxial cable is prevented from being damaged due to rotation and separation.

[Brief description of drawings]

FIG. 1 is a perspective view showing a series unit according to the first embodiment of the present invention, and FIG. 2 is a rear view thereof. FIG. 3 is a sectional view showing a mounting structure of the sleeve to the metal case, and FIG. 4 is a front view showing an ohmic band and its fixing and tightening mechanism before tightening. FIG. 5 is a structural view showing the end portion of the coaxial cable fitted into the sleeve, and FIG. 6 is a sectional view showing the fitting structure of the coaxial cable and the sleeve. FIG. 7 is a front view showing the ohmic band in the tightened state and its fixing and tightening mechanism. FIG. 8 is a perspective view showing a series unit according to the second embodiment. FIG. 9 is a plan view showing the ohmic band of the series unit and the fixing and tightening mechanism thereof according to the third embodiment, and FIG. 10 is a side view of the ohmic band. FIG. 11 is a plan view showing the ohmic band of the series unit and the fixing and tightening mechanism thereof according to the fourth embodiment. FIG. 12 is a plan view showing the ohmic band of the series unit and the fixing and tightening mechanism thereof according to the fifth embodiment. FIG. 13 is a sectional view showing another mounting structure of the sleeve of the series unit according to the sixth embodiment with respect to the metal case, and FIG. 14 is a sectional view showing another structure of the sleeve. FIG. 15 is a perspective view showing the structure of a conventional series unit. 1 ... Projection piece (fixing means) 1a ... Fixing surface (fixing means) 3a ... Small screw (fixing means) 4a, 4b ...... Spring (elastic means) 5a, 5b, 45a, 45b, 55a, 55b, 56a , 56b …… Ohm type band 6a …… Communication hole (fixing means) 7a …… Screw hole (fixing means) 3b, 43 …… Small screw (fastening means) 6b …… Communication hole (fastening means) 7b …… Screw hole (tightening means) 46 …… Nut (tightening means) 41,54 …… Holder (fixing means) 42 …… Fixing piece (fixing means) 10 …… Metal case, 13 …… Printed board 15, 16… … Side, 17 …… Front 18 …… Customer connector, 19 …… Design case 20, 30 …… Sleeve, 22 …… Head 50 …… Crimping ring 60 …… Coaxial cable, 62 …… Outer conductor 63 …… Insulator, 64 …… Central conductor

Claims (2)

[Claims] 1. A high-frequency signal connection unit, to which a coaxial cable for transmitting a high-frequency signal is connected, and which relays, terminates, demultiplexes, branches, or distributes the high-frequency signal, and has a box-shaped metal case, A sleeve that is erected on the side surface of the metal case and is composed of a cylindrical conductor, and the center conductor and the insulator of the coaxial cable that transmits a high-frequency signal penetrates the center hollow portion of the sleeve, and the insulator A sleeve inserted between the insulator and the outer conductor so that the inner surface of the outer conductor disposed on the outer side contacts the outer surface of the side wall of the sleeve, and the side wall of the sleeve around the sleeve. A pair of ohmic bands sandwiching the sleeve at predetermined intervals from both sides, and holding at least one end of the pair of ohmic bands,
A fixing member disposed in the metal case; an elastic member that urges the pair of ohmic bands in a direction that maintains a constant distance substantially symmetrically with respect to the sleeve; and a pair of ohmic bands. A high-frequency signal connection unit comprising: a fastening unit configured to fasten the pair of ohmic bands to the sleeve at an end portion opposite to one end held by the fixing unit. 2. A high-frequency signal connection unit, to which a coaxial cable for transmitting a high-frequency signal is connected, for relaying, terminating, demultiplexing, branching or distributing the high-frequency signal, wherein a box-shaped metal case is formed, A design case that covers the metal case, and a sleeve that is erected on the side surface of the metal case and that is composed of a cylindrical conductor, the center hollow portion of the sleeve being the center conductor and the insulation of the coaxial cable that transmits a high-frequency signal. A sleeve inserted between the insulator and the outer conductor, such that the body penetrates and the inner surface of the outer conductor arranged outside the insulator contacts the outer surface of the side wall of the sleeve; Centering, a pair of ohmic bands sandwiching the sleeve at predetermined intervals from both sides of the side wall of the sleeve, and holding at least one end of the pair of ohmic bands,
A fixing means arranged in the design case; an elastic member for urging the pair of ohmic bands in a direction in which the pair of ohmic bands are held approximately symmetrically with respect to the sleeve; A high-frequency signal connection unit having a fastening means for fastening the pair of ohmic bands to the sleeve at an end portion opposite to one end held by the fixing means.