JP2009151985A - L-shape coaxial plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an L-shape coaxial plug in which a projecting length is made short when connected to a wall face terminal and which has excellent electric characteristics throughout a wide range of frequency band. <P>SOLUTION: The plug body 14 is composed of a cylinder part 14b and a flange part 14a, and a cylindrical projection portion 14c is formed from circumferential side of the flange part 14a. A spring 15 is housed in a through-hole in the cylinder part 14b, and an insulator 13 to support a center contact 12 is housed in a first housing hole 14i in the flange part 14a. A core wire 3d of a coaxial cable 3 screwed into the cylindrical projection portion 14c is pinched and connected to a pinching portion 12a of the center contact 12, and a braided wire 3b is in contact and connected to the cylindrical projection portion 14c. An insulating plate 11 of a prescribed thickness is housed in a second housing hole 14j of the plug body 14 and a shield cover 10 is pressed in a third housing hole 14k from its top. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an L-shaped coaxial plug whose projecting length is shortened when connected to a terminal for leading an electrical signal provided on a wall surface or the like.

  In general, a high-frequency electric signal in a TV signal or CATV is derived from a wall surface terminal provided on a wall surface or the like and supplied to a television receiver or a tuner. This wall surface terminal is a coaxial connector, and a coaxial plug attached to the other end of the coaxial cable connected to one end of the television receiver or tuner is connected to the wall surface terminal. A TV signal or a CATV signal is input to the tuner. An L-shaped coaxial plug connected to the wall terminal is known. In the L-type coaxial plug, since the direction of the derived coaxial cable is substantially orthogonal to the mounting direction to the wall surface terminal, the coaxial cable does not protrude from the wall surface when the L-type coaxial plug is connected to the wall surface terminal. Wiring can be performed almost along the wall surface.

  An example of a conventional L-shaped coaxial plug is shown in FIGS. FIG. 31A is a side view showing the configuration of a conventional L-shaped coaxial plug 100, and FIG. 31B is a side view showing the configuration of the conventional L-shaped coaxial plug 100 in a sectional view. The L-shaped coaxial plug 100 shown in these drawings is provided at the distal end of the coaxial cable 110 and includes a mold part 101 and a plug outer conductor 102. In the L-type coaxial plug 100, a part of the plug outer conductor 102 is extended and bent so as to be substantially orthogonal, and the bent portion is caulked to a shield conductor folded on the outer cover of the coaxial cable 110. I am doing so. The core wire of the coaxial cable 110 is bent so as to be orthogonal to each other, and is disposed on the central axis of the plug outer conductor 102 to serve as a center contact. Further, in order to improve electrical characteristics, the connection portion between the shield conductor of the coaxial cable 110 and the plug outer conductor 102 and the bent core wire are covered with a shield box 103. Then, by molding a resin material from the rear part of the plug outer conductor 102 to the shield box 103 and the coaxial cable 110, the mold part 101 is formed, and the L-shaped coaxial plug 100 is created.

When the conventional L-shaped coaxial plug 100 is connected to a coaxial connector serving as a wall surface terminal, almost the entire mold part 101 protrudes from the wall surface. Since the depth of the mold part 101 is increased, there is a problem in that the length of the L-type coaxial plug 100 protruding from the wall surface when connected to the coaxial connector is increased.
An example of the frequency characteristic of the insertion loss of the conventional L-shaped coaxial plug 100 is shown in FIG. In this case, the coaxial cable 110 is a 2C type. The frequency range shown in FIG. 32 is a frequency range of 0.03 MHz to 3000 MHz. Referring to FIG. 32, the insertion loss increases as the frequency increases, and the maximum is about 1.7 dB when the frequency is about 2560 MHz. Insertion loss. That is, the insertion loss characteristic deteriorates in the high frequency range. Further, FIG. 33 shows an example of frequency characteristics of the voltage standing wave ratio (VSWR) of the conventional L-shaped coaxial plug 100. Referring to FIG. 33, in the frequency range of 0.03 MHz to 3000 MHz, the VSWR increases as the frequency increases. When the frequency is about 2560 MHz, the maximum VSWR is about 1.5. That is, the VSWR deteriorates at higher frequencies.

Furthermore, an example of the frequency characteristic of the impedance of the conventional L-shaped coaxial plug 100 is shown in FIG. Referring to FIG. 34, it can be seen that in the frequency range of 0.03 MHz to 3000 MHz, the impedance deviates from the center as the frequency increases. As described above, in the conventional L-type coaxial plug, when the frequency range is 0.03 MHz to 3000 MHz, there is a problem that good electrical characteristics cannot be obtained over the entire frequency band.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an L-type coaxial plug that can shorten the length that protrudes when connected to a wall surface terminal and that exhibits good electrical characteristics over a wide frequency range.

  In order to achieve the above object, an L-shaped coaxial plug according to the present invention comprises a cylindrical portion and a flange portion provided at the rear portion of the cylindrical portion and formed with a cylindrical protruding portion that protrudes from a peripheral side surface. A plug body in which a hole is formed, and an insulator that is housed in a through-hole in the flange and has an insertion hole that is formed substantially at the center to support the center contact so as to extend substantially along the central axis of the cylindrical portion A shield cover that is fitted to the rear surface of the plug body via an insulating plate having a predetermined thickness, and the cable core wire introduced from the cylindrical protrusion is connected to the rear end of the center contact The most important feature is that the shield conductor of the cable is connected in contact with the cylindrical protrusion.

  The present invention relates to a plug main body having a cylindrical portion and a flange portion provided with a cylindrical protrusion portion that is provided at the rear portion of the cylindrical portion and protrudes from a peripheral side surface. An insulator that is housed in the through-hole and has an insertion hole that supports the center contact so as to extend substantially along the central axis of the cylindrical portion, and an insulating plate having a predetermined thickness on the rear surface of the plug body A cable cover introduced through the cylindrical protrusion is connected to the rear end of the center contact, and the shield conductor of the cable is in contact with the cylindrical protrusion. The thickness of the collar portion can be reduced. Therefore, only the collar part thinned when protruding to the wall surface terminal protrudes, and the protruding length can be shortened. Further, by setting the thickness of the insulating plate to a predetermined thickness, good electrical characteristics can be exhibited over a wide band.

An embodiment in which the L-shaped coaxial plug of the embodiment of the present invention is connected to a series unit provided on a wall surface or the like is shown in FIG.
In FIG. 1, the series unit 2 is attached to a box embedded in a wall surface and is provided with a coaxial connector (not shown). An L-shaped coaxial plug 1 according to the present invention is connected to the coaxial connector. A coaxial cable 3 is led out from the L-shaped coaxial plug 1. As shown in the drawing, the length of the L-shaped coaxial plug 1 connected to the coaxial connector protruding from the plate surface of the series unit 2 is shortened.

Here, FIG. 2 shows an exploded view showing the configuration of the L-shaped coaxial plug 1 of the first embodiment of the present invention.
As shown in FIG. 2, the L-type coaxial plug 1 of the first embodiment includes a shield cover 10, an insulating plate 11, a center contact 12, an insulator 13, a plug body 14, and a spring 15. 3 is introduced from the plug body 14. The shield cover 10 is made of metal or the like and has a disk shape. The insulating plate 11 is made of an insulating resin such as polycarbonate and has a disk shape that is slightly smaller than the shield cover 10. The center contact 12 is formed by processing a metal rod, and the detailed configuration is shown in FIGS. FIG. 21A is a plan view showing a cross-sectional view taken along the central axis showing the configuration of the center contact 12, and FIG. 21B is a side view showing the configuration of the center contact 12. As shown in these drawings, a pinching portion 12a having a large diameter is formed at the rear end portion of the center contact 12, and a cut groove 12c having a predetermined depth is formed in the pinching portion 12a. A contact portion 12b that has a tapered diameter and extends forward is formed from the sandwiching portion 12a, and the tip of the contact portion 12b is pointed.

  The insulator 13 is made of an insulating resin such as polycarbonate or polyethylene and has a substantially circular cross-sectional shape. The detailed structure of the insulator 13 is shown in FIGS. 20 (a), (b), and (c). 20 (a) is a plan view showing the configuration of the insulator 13, FIG. 20 (b) is a front view showing the configuration of the insulator 13, and FIG. 20 (c) shows the configuration of the insulator 13 as f−. It is a front view shown with sectional drawing cut | disconnected by f line | wire. As shown in these drawings, the insulator 13 has a substantially disc-shaped bottom plate 13b, and a ring portion 13a standing from the peripheral side of the bottom plate 13b is formed. A notch 13d is formed in a part of the ring portion 13a. The notch 13d is a notch for introducing the core wire 3d of the coaxial cable 3. An insertion hole 13c is formed substantially at the center of the bottom plate 13b, and a protruding portion 13e that slightly protrudes in a tapered shape is formed at the substantially center of the lower surface of the bottom plate 13b. The diameter of the insertion hole 13c is tapered from the middle, and an insertion hole 13c that is thinner than the diameter of the insertion hole 13c formed on the upper surface of the bottom plate 13b is formed in the protruding portion 13e. The cross-sectional shape of the insertion hole 13c is substantially the same as the cross-sectional shape of the boundary between the sandwiching portion 12a and the contact portion 12b of the center contact 12.

Next, the plug body 14 is made of metal or the like, and the detailed configuration of the plug body 14 is shown in FIGS. 15 is a side view showing the structure of the plug body, FIG. 16 is a rear view showing the structure of the plug body, FIG. 17 is a bottom view showing the structure of the plug body, and FIG. 18 is the structure of the plug body. FIG. 19 is a side view showing a cross-sectional view taken along the line dd, and FIG. 19 is a bottom view showing the structure of the plug body taken along the line ee.
As shown in these drawings, the plug main body 14 includes a cylindrical portion 14b that is a portion to be fitted into the coaxial connector, and a flange portion 14a having a slightly larger outer diameter is formed at the rear end of the cylindrical portion 14b. The flange portion 14a has a two-stage configuration in which the outer diameter of the rear portion is slightly increased, and has a shape that is easy to grip. By holding the flange 14a and attaching the L-shaped coaxial plug 1 to the coaxial connector of the series unit 2, the embodiment shown in FIG. A through-hole 14d is formed over the entire cylindrical portion 14b and flange 14a.

  A cylindrical projecting portion 14c is formed from the lower side on the circumferential side of the flange portion 14a. The cylindrical projecting portion 14c is a portion into which the coaxial cable 3 is introduced, and a screw hole 14g is formed on the inner peripheral surface by cutting a screw. A taper portion 14h is formed in the back of the screw hole 14g, and a narrow diameter portion 14f having a reduced diameter is formed in communication with the taper portion 14h. The through-hole 14d formed in the inner periphery of the flange portion 14a is increased in inner diameter in three steps to form a first storage hole 14i, a second storage hole 14j, and a third storage hole 14k. The substantially circular first storage hole 14i is formed with a slightly larger inner diameter on the cylindrical portion 14b side, and the substantially circular second storage hole 14j is connected to the first storage hole 14i and further formed with a slightly larger inner diameter. The substantially circular third storage hole 14k is connected to the second storage hole 14j and has a slightly larger inner diameter and is formed on the most back side. A step is formed at each boundary of the cylindrical portion 14b to the third storage hole 14k. A locking portion 14e having a slightly narrowed diameter is formed at the tip of the through hole 14d formed in the inner periphery of the cylindrical portion 14b.

Next, the spring 15 is made of an elastic metal such as phosphor bronze, and its detailed configuration is shown in FIGS. FIG. 12 is a development view showing the configuration of the spring 15, FIG. 13 is a cross-sectional view taken along line cc showing the configuration of the spring 15, and FIG. 14 is a plan view showing the configuration of the spring 15.
As shown in these figures, the spring 15 has a rectangular main body portion 15a formed by processing a thin elastic metal plate, and the main body portion 15a is slit in the longitudinal direction as shown in FIG. A plurality of 15b are formed. And the bulging part 15c is formed when the site | part between the slot 15b and the slot 15b is bent as shown in FIG. Next, the spring 15 having the shape shown in FIG. 14 is created by bending the main body portion 15a into a substantially circular shape so that the bulging portion 15c protrudes inward. That is, a plurality of bulged portions 15c protrude from the inner peripheral side of the spring 15, and the supported body is elastically supported by the bulged portions 15c.

  Returning to FIG. 2, the assembly of the L-shaped coaxial plug 1 of the first embodiment will be described. First, the diameter of the spring 15 is reduced in the through hole 14d formed in the inner periphery of the cylindrical portion 14b of the plug body 14. Grip and store. In this case, the diameter of the spring 15 returns to the original due to elasticity in the through-hole 14d, and the spring 15 elastically adheres to the inner peripheral surface of the cylindrical portion 14b. Further, the tip of the stored spring 15 is locked by a locking portion 14e formed at the tip of the through hole 14d, so that the spring 15 does not come out of the cylindrical portion 14b. Next, the insulator 13 is inserted into the flange portion 14a from the back side of the plug body 14 so that the ring portion 13a is on the back side. In this case, the center contact 12 is inserted through the insertion hole 13 c of the insulator 13. Since the outer diameter of the insulator 13 is larger than the inner diameter of the through hole 14d and smaller than the inner diameter of the first storage hole 14i, the inserted insulator 13 is connected to the inner periphery of the cylindrical portion 14b and the first storage hole. 14a is stored in the first storage hole 14i in contact with the step formed between the first storage hole 14i and the first storage hole 14i. In addition, the position of the notch 13d of the insulator 13 is aligned with the cylindrical protrusion 14c.

  As a result, the contact portion 12b of the center contact 12 mounted on the insulator 13 is disposed substantially on the central axis of the cylindrical portion 14b, and the sandwiching portion 12a is disposed substantially at the center of the ring portion 13a of the insulator 13. Become. Next, the coaxial cable 3 is screwed into the screw hole 14g from the outside of the cylindrical protrusion 14c. The inner diameter of the screw hole 14 g is slightly larger than the outer diameter of the outer jacket 3 a of the coaxial cable 3. In this case, the front end portion of the coaxial cable 3 is processed, and the processing mode is shown in FIG. As shown in FIG. 11, the jacket 3a of the coaxial cable 3 is cut by a predetermined length to expose the braided wire 3b serving as a shield conductor. Next, the insulator 3c is exposed by cutting away a part of the braided wire 3b. Further, the core 3d having a predetermined length is exposed by leaving a part of the insulator 3c to be exposed. When the coaxial cable 3 whose tip is processed in this way is screwed into the screw hole 14g of the cylindrical protrusion 14c, the insulator 3D is accommodated through the small diameter portion 14f of the cylindrical protrusion 14c. 13 is inserted through the notch 13d. The core wire 3d is inserted into the cut groove 12c in the center contact 12, and the clamping portion 12a is crimped. As a result, the core wire 3d is electrically connected to the center contact 12. Further, since the insulator 3c of the coaxial cable 3 is inserted into the narrow-diameter portion 14f having substantially the same diameter, the braided wire 3b is pressed and brought into contact with the tapered portion 14h of the cylindrical projecting portion 14c, so that the electrical Will be securely connected.

  Next, the insulating plate 11 is inserted into the flange portion 14 a from the back side of the plug body 14. Since the outer diameter of the insulating plate 11 is larger than the inner diameter of the first storage hole 14i and smaller than the inner diameter of the second storage hole 14j, the inserted insulating plate 11 is connected to the first storage hole 14i and the second storage hole 14i. It contacts the step formed between the hole 14j and is stored in the second storage hole 14j. Further, the shield cover 10 having the same diameter as that of the third storage hole 14k is press-fitted from above the insulating plate 11 into the third storage hole 14k of the flange portion 14a. Thereby, the L-shaped coaxial plug 1 of the first embodiment can be assembled.

FIG. 3 is a side view showing the configuration of the L-type coaxial plug 1 of the first embodiment of the present invention assembled as described above, FIG. 4 is a rear view showing the configuration of the L-type coaxial plug 1, and FIG. 5 is a bottom view showing the structure of FIG. 1, FIG. 6 is a side view showing the structure of the L-shaped coaxial plug 1 during assembly in a sectional view, and FIG. 6 is a cross-sectional view of the structure of the L-shaped coaxial plug 1 taken along line aa. FIG. 7 is a side view showing the configuration, FIG. 8 is a partially enlarged view showing the configuration of the L-type coaxial plug 1, and FIG. 8 is a cross-sectional view of the configuration of the L-type coaxial plug 1 cut along the line bb. A plan view is shown in FIG. Moreover, the modification which deform | transformed the collar part of the L-shaped coaxial plug 1 is shown in FIG.
As shown in these drawings, the center contact 12 is supported by a disk-shaped insulator 13, and when the center contact 12 is supported by the insulator 13, the sandwiching that protrudes toward the ring portion 13a of the insulator 13 is performed. The height of the portion 12a is substantially the same as the height of the ring portion 13a. Therefore, one surface of the insulating plate 11 inserted between the shield cover 10 and the insulator 13 comes into close contact with the upper surface of the ring portion 13a of the insulator 13 and the end surface of the sandwiching portion 12a. The core wire 3d in the coaxial cable 3 introduced from the cylindrical protrusion 14c is exposed in the flange 14a so as to face the metal shield cover 10 through the insulating plate 11 as shown in FIGS. Thus, a predetermined impedance is generated. Since this impedance corresponds to the distance between the core wire 3d and the shield cover 10, the impedance can be adjusted by adjusting the thickness of the insulating plate 11.

Further, when the coaxial cable 3 is screwed into the screw hole 14g of the cylindrical protrusion 14c, the L-shaped coaxial plug 1 of the first embodiment of the present invention has a braided wire 3b that is cylindrical as shown in an enlarged view in FIG. Since the compressed portion 14c is compressed and pressed into contact with the tapered portion 14h of the protruding portion 14c, the electrical connection between the braided wire 3b and the plug body 14 can be reliably performed. Since the coaxial cable 3 is fixed by screwing in this way, the length of the cylindrical protrusion 14c can be as short as about 5 mm, for example. Further, after the coaxial cable 3 is screwed into the screw hole 14g of the cylindrical protrusion 14c, the cylindrical protrusion 14c is caulked so that the thread of the screw hole 14g bites into the jacket 3a of the coaxial cable 3. Thus, the tensile strength can be improved.
In addition, it is good also as a structure shown in FIG. In the L-shaped coaxial plug 1 ′ shown in FIG. 10, the outer diameter shape of the flange portion 14a ′ is tapered. It is good also as plug main body 14 'provided with the collar part 14a' of such a shape. The internal configuration of the L-type coaxial plug 1 ′ in this case is the same as that of the L-type coaxial plug 1.

  When the L-shaped coaxial plug 1 according to the first embodiment of the present invention configured as described above is attached to the coaxial connector as shown in FIG. 1, the inner peripheral surface of the bulging portion 15c of the spring 15 is the outer peripheral surface of the coaxial connector. The center contact 12 enters the coaxial connector and is connected to the central conductor of the coaxial connector. In this case, since only the collar portion 14a having a thin structure protrudes from the plate surface of the series unit 2, the protruding length can be shortened.

Next, electrical characteristics when the coaxial cable 3 is a 2C type coaxial cable in the L-shaped coaxial plug 1 of the first embodiment are shown in FIGS. FIG. 22 shows frequency characteristics of insertion loss when the length of the coaxial cable 3 is about 1.5 m, the material of the shield cover 10 is aluminum, and the thickness t of the insulating plate 11 is about 0.5 mm. FIG. 24 is a Smith chart showing the impedance characteristics under the same conditions. FIG. 24 shows the frequency characteristics of the voltage standing wave ratio (VSWR) under the same conditions. The frequency range shown in FIGS. 22 to 24 is a frequency range of 0.03 MHz to 3000 MHz.
Referring to FIG. 22, the insertion loss tends to increase as the frequency increases. However, the insertion loss does not change so that the insertion loss is improved to a maximum insertion loss of about 1.5 dB even when the frequency is set to 3000 MHz. Become so. Referring to FIG. 23, in the frequency range of 0.03 MHz to 3000 MHz, the VSWR tends to increase as the frequency increases, but the VSWR is improved to 1.2 or less in the entire frequency range. Further, referring to FIG. 24, in the frequency range of 0.03 MHz to 3000 MHz, the impedance tends to deviate from the center as the frequency becomes higher, but the improvement is made so that the deviation rate becomes smaller. I understand.

In addition, FIG. 25 to FIG. 27 show the electrical characteristics when the thickness of the insulating plate 11 is changed in the L-shaped coaxial plug 1 of the first embodiment. FIG. 25 shows the frequency characteristics of insertion loss when the length of the coaxial cable 3 is about 1.5 m, the material of the shield cover 10 is aluminum, and the thickness t of the insulating plate 11 is about 0.8 mm. FIG. 27 is a Smith chart showing the frequency characteristics of the voltage standing wave ratio (VSWR) under the same conditions, and FIG. 27 is an impedance characteristic under the same conditions. The frequency range shown in FIGS. 25 to 27 is a frequency range of 0.03 MHz to 3000 MHz.
Referring to FIG. 25, the insertion loss tends to increase as the frequency increases, and the insertion loss changes slightly in the high range, and the maximum insertion loss of about 1.6 dB is slightly observed in the vicinity of about 3000 MHz. Although deteriorated, the conventional L-shaped coaxial plug 100 is improved. In addition, referring to FIG. 26, in the frequency range of 0.03 MHz to 3000 MHz, the VSWR tends to increase as the frequency becomes higher, and slightly deteriorates to a VSWR of 1.25 or less in the entire frequency range. It is an improvement over the plug 100. Further, referring to FIG. 27, in the frequency range of 0.03 MHz to 3000 MHz, the impedance tends to shift from the center as the frequency becomes higher, and the deviation rate becomes slightly larger, but is improved over the conventional L-type coaxial plug 100. You can see that.
In this way, the electrical characteristics of the L-type coaxial plug 1 can be adjusted by adjusting the thickness t of the insulating plate 11, and the best when the thickness t of the insulating plate 11 is about 0.5 mm. Electrical characteristics could be obtained.

Next, FIG. 28 shows an exploded view showing the configuration of the L-shaped coaxial plug 5 of the second embodiment of the present invention. In the L-type coaxial plug 5 of the second embodiment of the present invention, an insulator can be fitted in alignment with the plug body. Therefore, FIG. 29 is a rear view showing the configuration of the plug body 24 in the L-shaped coaxial plug 5 of the second embodiment, FIG. 30A is a plan view showing the configuration of the insulator 23, and the configuration of the insulator 23 is shown. FIG. 30B is a front view showing a cross-sectional view taken along the line gg.
As shown in FIGS. 28 and 29, the plug body 24 in the L-shaped coaxial plug 5 of the second embodiment is made of a conductive material such as a metal, and includes a cylindrical portion 24b, and is provided at the rear end of the cylindrical portion 24b. A flange 24a having a large diameter is formed. The collar portion 24a has a rear portion whose outer diameter is increased and is easily gripped. A through hole 24d is formed over the entire cylindrical portion 24b and flange 24a.

  A cylindrical protrusion 24c is formed from the lower side on the circumferential side of the flange 24a. Since the structure of the cylindrical protrusion 24c is the same as that of the cylindrical protrusion 14c in the L-shaped coaxial plug 1 of the first embodiment, the description thereof is omitted. The through hole 24d formed in the inner periphery of the flange 24a has a three-step inner diameter to form a first storage hole 24i, a second storage hole 24j, and a third storage hole 24k. The substantially circular first storage hole 24i is formed with a slightly larger inner diameter on the cylindrical portion 24b side, and a pair of engagement protrusions 24m are formed so as to face the inner peripheral surface thereof. Further, the substantially circular second storage hole 24j is connected to the first storage hole 24i and has a slightly larger inner diameter, and the substantially circular third storage hole 24k is connected to the second storage hole 24j and further slightly. The inner diameter is large and formed on the back side. A step is formed at each boundary of the cylindrical portion 24b to the third storage hole 24k. In addition, although not shown, a locking portion having a slightly narrowed diameter is formed at the tip of the through hole 24d formed on the inner periphery of the cylindrical portion 24b.

As shown in FIGS. 28 and 29, the insulator 23 in the L-shaped coaxial plug 5 of the second embodiment is made of an insulating resin such as polycarbonate or polyethylene and has a substantially circular cross-sectional shape. ing. The insulator 23 has a substantially disc-shaped bottom plate 23b, and a ring portion 23a standing from the peripheral side of the bottom plate 23b is formed. A pair of opposing engaging grooves 23f are formed on the outer peripheral surface of the ring portion 23a, and a notch 23d is formed in a part of the ring portion 23a. A pair of engagement protrusions 24m of the plug body 24 can be engaged with the pair of engagement grooves 23f, and the notch 23d is a notch for introducing the core wire 3d of the coaxial cable 3. An insertion hole 23c is formed at substantially the center of the bottom plate 23b, and a protruding portion 23e that slightly protrudes in a tapered shape is formed at substantially the center of the lower surface of the bottom plate 23b. The diameter of the insertion hole 23c is tapered from the middle, and an insertion hole 23c that is thinner than the diameter of the insertion hole 23c formed in the upper surface of the bottom plate 23b is formed in the protruding portion 23e. The cross-sectional shape of the insertion hole 23c is substantially the same as the cross-sectional shape of the boundary between the sandwiching portion 12a and the contact portion 12b of the center contact 12.
Here, the configurations of the shield cover 10, the insulating plate 11, the center contact 12 and the spring 15 constituting the L-type coaxial plug 5 of the second embodiment are the same as those of the L-type coaxial plug 1 of the first embodiment. Therefore, the explanation is omitted.

  Returning to FIG. 28, the assembly of the L-shaped coaxial plug 5 of the second embodiment will be described. First, the diameter of the spring 15 is reduced in the through hole 24d formed in the inner periphery of the cylindrical portion 24b of the plug body 24. Grip and store. In this case, the diameter of the spring 15 returns to the original due to elasticity in the through hole 24d, and the spring 15 is elastically adhered to the inner peripheral surface of the cylindrical portion 24b. Further, the tip of the stored spring 15 is locked by a locking portion formed at the tip of the through hole 24d, so that the spring 15 does not come out of the cylindrical portion 24b. Next, the insulator 23 in which the center contact 12 is inserted into the insertion hole 23c is inserted into the flange 24a from the back side of the plug body 24 so that the ring portion 23a is on the back side. In this case, the pair of engaging grooves 23f in the insulator 23 are aligned and fitted so that the pair of engaging protrusions 24m formed in the flange 24a are engaged. As a result, the position of the notch 23d of the insulator 23 is aligned with the cylindrical protrusion 24c. Since the outer diameter of the insulator 23 is larger than the inner diameter of the through hole 24d and smaller than the inner diameter of the first storage hole 24i, the inserted insulator 23 is connected to the inner periphery of the cylindrical portion 24b and the first storage hole. The first storage hole 24i is stored in contact with the step formed between the first storage hole 24i and the first storage hole 24i.

  The contact portion 12b of the center contact 12 attached to the insulator 23 is disposed on substantially the central axis of the cylindrical portion 24b, and the sandwiching portion 12a is disposed at substantially the center of the ring portion 23a of the insulator 23. . Next, the coaxial cable 3 is screwed into the screw hole 24g from the outside of the cylindrical protrusion 24c. The inner diameter of the screw hole 24g is slightly larger than the outer diameter of the jacket 3a of the coaxial cable 3. In this case, the front end portion of the coaxial cable 3 is processed as shown in FIG. When the coaxial cable 3 whose tip is processed in this way is screwed into the screw hole 24g of the cylindrical protrusion 24c, the insulator 3d is accommodated through the small diameter portion 24f of the cylindrical protrusion 24c. 23 is inserted through the notch 23d. The core wire 3d is inserted into the cut groove 12c in the center contact 12, and the clamping portion 12a is crimped. As a result, the core wire 3d is electrically connected to the center contact 12. Further, since the insulator 3c of the coaxial cable 3 is inserted into the narrow-diameter portion 24f having the same diameter as that of the insulator 3c formed in the back of the screw hole 24g via a tapered portion, the braided The wire 3b comes into pressure contact with and comes into contact with a tapered portion formed at the back of the screw hole 24g in the cylindrical projecting portion 24c, so that the wire 3b is electrically connected reliably.

  Next, the insulating plate 11 is inserted into the flange portion 24 a from the back side of the plug body 24. Since the outer diameter of the insulating plate 11 is larger than the inner diameter of the first storage hole 24i and smaller than the inner diameter of the second storage hole 24j, the inserted insulating plate 11 is connected to the first storage hole 24i and the second storage hole 24i. It contacts with the level | step difference formed between the hole 24j, and is accommodated in the 2nd accommodation hole 24j. Further, the shield cover 10 having the same diameter as the inner diameter of the third storage hole 24k is press-fitted from above the insulating plate 11 into the third storage hole 24k of the flange 24a. Thereby, the L-shaped coaxial plug 5 of the second embodiment can be assembled.

In the L-shaped coaxial plug 5 of the second embodiment of the present invention thus assembled, the center contact 12 is supported by the disk-shaped insulator 23, and the center contact 12 is supported by the insulator 23. Further, the height of the sandwiching portion 12a protruding toward the ring portion 23a side of the insulator is substantially the same as the height of the ring portion 23a. Therefore, one surface of the insulating plate 11 interposed between the shield cover 10 and the insulator 23 comes into close contact with the ring portion 23a of the insulator 23 and the end surface of the sandwiching portion 12a. The core wire 3d in the coaxial cable 3 introduced from the cylindrical protrusion 24c is exposed in the flange 24a and faces the metal shield cover 10 through the insulating plate 11, so that a predetermined impedance is generated. become. Since this impedance corresponds to the distance between the core wire 3d and the shield cover 10, the impedance can be adjusted by adjusting the thickness of the insulating plate 11.
The electrical characteristics of the L-shaped coaxial plug 5 of the second embodiment can be adjusted by adjusting the thickness t of the insulating plate 11, and when the thickness t of the insulating plate 11 is about 0.5 mm. In addition, the L-type coaxial plug 5 has the same electrical characteristics as the L-type coaxial plug 1 of the first embodiment.

Also in the L-shaped coaxial plug 5 of the second embodiment of the present invention, when the coaxial cable 3 is screwed into the screw hole 24g of the cylindrical protruding portion 24c, the braided wire 3b becomes a tapered portion in the cylindrical protruding portion 24c. Since it is compressed and pressed by the pressure generated by the screwing, the electrical connection between the braided wire 3b and the plug main body 24 can be reliably performed. Since the coaxial cable 3 is fixed by screwing in this way, the length of the cylindrical protrusion 24c can be set to a short length of about 5 mm, for example. Further, after the coaxial cable 3 is screwed into the screw hole 24g of the cylindrical protrusion 24c, the cylindrical protrusion 24c is caulked so that the thread of the screw hole 24g bites into the jacket 3a of the coaxial cable 3. Thus, the tensile strength can be improved.
The configuration in which the L-shaped coaxial plug 5 of the second embodiment of the present invention thus configured is mounted on the coaxial connector is the same as the configuration shown in FIG. 1, and the inner peripheral surface of the bulging portion 15c of the spring 15 is coaxial. While being pressed against the outer peripheral surface of the connector, the center contact 12 enters the coaxial connector and is connected to the central conductor of the coaxial connector. In this case, since only the flange portion 24a having a thin structure protrudes from the plate surface of the series unit 2, the protruding length can be shortened.

  The L-type coaxial plug 1 according to the first embodiment and the L-type coaxial plug 5 according to the second embodiment described above are F-type coaxial terminals, but the present invention is not limited to this and other types are used. A coaxial terminal may be used.

It is a perspective view which shows the aspect which connected the L-shaped coaxial plug of the Example concerning this invention to the serial unit provided in the wall surface etc. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view showing a configuration of an L-shaped coaxial plug according to a first embodiment of the present invention. It is a side view which shows the structure of the L-shaped coaxial plug of 1st Example concerning this invention. It is a rear view which shows the structure of the L-shaped coaxial plug of 1st Example concerning this invention. It is a bottom view which shows the structure of the L-shaped coaxial plug of 1st Example concerning this invention. It is a side view which shows the structure in the middle of the assembly of the L-shaped coaxial plug of 1st Example concerning this invention by sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a configuration of an L-shaped coaxial plug according to a first embodiment of the present invention in a sectional view cut along a line aa. FIG. 8 is a partially enlarged view of FIG. 7 showing the configuration of the L-shaped coaxial plug of the first embodiment according to the present invention. It is a top view shown with the sectional view which cut the composition of the L type coaxial plug of the 1st example concerning the present invention by the bb line. It is a figure which shows the modification which deform | transformed the collar part of the L-shaped coaxial plug of 1st Example concerning this invention. It is a figure which shows the aspect of a process of the coaxial cable in the L-shaped coaxial plug of 1st Example of this invention. It is an expanded view which shows the structure of the spring in the L-shaped coaxial plug of 1st Example of this invention. It is sectional drawing which cut | disconnected the structure of the spring in the L-shaped coaxial plug of 1st Example of this invention by the cc line. It is a top view which shows the structure of the spring in the L-shaped coaxial plug of 1st Example of this invention. It is a side view which shows the structure of the plug main body in the L-shaped coaxial plug of 1st Example of this invention. It is a rear view which shows the structure of the plug main body in the L-shaped coaxial plug of 1st Example of this invention. It is a bottom view which shows the structure of the plug main body in the L-shaped coaxial plug of 1st Example of this invention. It is a side view shown with the sectional view which cut the composition of the plug body in the L type coaxial plug of the 1st example of the present invention by the dd line. It is a bottom view which shows the structure of the plug main body in the L-type coaxial plug of 1st Example of this invention with sectional drawing cut | disconnected by the ee line | wire. It is the top view which shows the structure of the insulator in the L-type coaxial plug of 1st Example of this invention, the front view, and the front view shown with sectional drawing cut | disconnected by the ff line | wire. It is the top view and side view which are shown with sectional drawing cut | disconnected along the central axis which shows the structure of the center contact in the L-shaped coaxial plug of 1st Example of this invention. It is a figure which shows the frequency characteristic of the insertion loss of the L-shaped coaxial plug of 1st Example of this invention. It is a figure which shows the frequency characteristic of VSWR of the L-type coaxial plug of 1st Example of this invention. It is a Smith chart which shows the impedance characteristic of the L-shaped coaxial plug of 1st Example of this invention. It is a figure which shows the frequency characteristic of the insertion loss at the time of changing the thickness of an insulating board in the L-shaped coaxial plug of 1st Example of this invention. It is a figure which shows the frequency characteristic of VSWR when the thickness of an insulating board is changed in the L-shaped coaxial plug of 1st Example of this invention. It is a Smith chart which shows the impedance characteristic of the L-type coaxial plug at the time of changing the thickness of an insulating board in 1st Example of this invention. It is a disassembled assembly figure which shows the structure of the L-shaped coaxial plug of 2nd Example concerning this invention. It is a rear view which shows the structure of the plug main body in the L-type coaxial plug of 2nd Example of this invention. It is the top view shown with the top view which shows the structure of the insulator in the L-shaped coaxial plug of 2nd Example of this invention, and sectional drawing cut | disconnected by the gg line. It is the side view which shows the structure of the conventional L-shaped coaxial connector plug, and a side view shown with sectional drawing. It is a figure which shows the frequency characteristic of the insertion loss of the conventional L-shaped coaxial connector plug. It is a figure which shows the frequency characteristic of VSWR of the conventional L-shaped coaxial connector plug. It is a Smith chart which shows the impedance characteristic of the conventional L-shaped coaxial connector plug.

Explanation of symbols

1 L-type coaxial plug, 2 series unit, 3 coaxial cable, 3a jacket, 3b braided wire, 3c insulator, 3d core wire, 5 L-type coaxial plug, 10 shield cover, 11 insulating plate, 12 center contact, 12a clamping part 12b Contact part, 12c Groove, 13 Insulator, 13a Ring part, 13b Bottom plate, 13c Insertion hole, 13d Notch, 13e Protruding part, 14 Plug body, 14a Cage part, 14b Cylindrical part, 14c Cylindrical projecting part, 14d Through hole, 14e Locking part, 14f Small diameter part, 14g Screw hole, 14h Taper part, 14i First storage hole, 14j Second storage hole, 14k Third storage hole, 15 Spring, 15a Body part, 15b Slot, 15c bulge part, 23 insulator, 23a ring part, 23b bottom plate, 23c insertion hole, 23d notch, 23e protrusion 23f engaging groove, 24 plug body, 24a collar part, 24b cylindrical part, 24c cylindrical protruding part, 24d through hole, 24f small diameter part, 24g screw hole, 24i first storage hole, 24j second storage hole, 24k first 3 storage hole, 24 m engagement protrusion, 100 L-type coaxial plug, 101 mold part, 102 plug outer conductor, 103 shield box, 110 coaxial cable

Claims (6)

A plug body having a cylindrical portion and a flange portion provided with a cylindrical protruding portion that is provided at the rear portion of the cylindrical portion and protrudes from a peripheral side surface;
A spring that is housed in the through hole in the cylindrical portion and has a bulging portion that bulges inward;
An insulator that is housed in the through-hole in the flange and has an insertion hole that is formed substantially at the center to support a center contact so as to extend substantially along the central axis of the cylindrical portion;
A shield cover fitted to the rear surface of the plug body via an insulating plate of a predetermined thickness;
The cable core introduced from the cylindrical protrusion in the flange is connected to the rear end of the center contact, and the shield conductor of the cable is connected in contact with the cylindrical protrusion. An L-shaped coaxial plug characterized by the above.   At the rear end portion of the center contact, a holding portion in which a kerf is formed is formed, and a contact portion having a diameter reduced from the holding portion is formed, and the contact portion is formed in the insulator in the insulator. 2. The contact portion is disposed substantially along the central axis of the cylindrical portion by being inserted into the insertion hole, and the core wire of the cable is sandwiched and connected to the sandwiching portion. The L-shaped coaxial plug as described.   A screw hole in which a screw is cut and a small-diameter portion connected to the screw hole via a taper portion are formed on the inner peripheral surface of the cylindrical protrusion, and the cable is screwed into the screw hole. The L-shaped coaxial plug according to claim 1, wherein the L-shaped coaxial plug is fixed.   When the cable is screwed into the screw hole, an internal insulator that insulates the core wire from the shield conductor is inserted into the small diameter portion, and the shield conductor of the cable comes into contact with the tapered portion. The L-shaped coaxial plug according to claim 3, wherein the L-type coaxial plug is connected.   Engagement protrusions are formed on the inner peripheral surface of the through hole in the flange, and an engagement groove that engages with the engagement protrusion is formed on the outer peripheral surface of the insulator. The L-shaped coaxial plug according to claim 1, wherein the insulator can be aligned with the plug body by the engagement groove.   6. The L according to claim 1, wherein the insulating plate has a shape that closes a rear surface of the plug body, and the thickness of the insulating plate is approximately 0.5 mm. Type coaxial plug.

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