JP7357913B2 - coaxial connector - Google Patents

Description

The present invention relates to a coaxial connector. In particular, the present invention relates to the structure of a coaxial connector connected to an end of a coaxial cable, which includes a center contact having a female terminal that can be detachably connected to a male terminal of a mating coaxial connector.

For example, a coaxial connector assembly has been disclosed in which a multicore coaxial connector (plug) connected to the terminals of a plurality of coaxial cables can be detachably attached to a multicore coaxial connector (receptacle) that can be mounted on a printed circuit board (for example, (See Patent Document 1).

The coaxial connector assembly according to Patent Document 1 is said to be able to perform a complete releasable lock while maintaining characteristic impedance.

JP 2019-3856 Publication

FIG. 6 is a diagram showing the configuration of a coaxial connector assembly according to the prior art, in which FIG. 6(A) is a right side view of the coaxial connector assembly, FIG. 6(B) is a rear view of the coaxial connector assembly, FIG. 6(C) is a sectional view taken along the line XX in FIG. 6(B).

FIG. 7 is a perspective exploded view showing the internal structure of a plug constituting a conventional coaxial connector assembly. Note that FIGS. 6 and 7 of the present application correspond to FIGS. 5 and 2 of Patent Document 1.

Referring to FIG. 6, the prior art coaxial connector assembly CN consists of a plug 8 and a receptacle 9. The plug 8 is connected to the terminals of a plurality of coaxial cables Cb. The receptacle 9 can be mounted on a printed circuit board (not shown). The plug 8 can be attached to and removed from the receptacle 9. Note that FIG. 6 shows a state in which the receptacle 9 and the plug 8 are connected.

Referring to FIG. 6, the plug 8 includes a rectangular parallelepiped housing 8h, a plurality of center contacts 81, and the same number of cylindrical shells 82 as the center contacts 81. The housing 8h has a cable insertion hole extending from one end surface to the other end surface. The cable insertion holes are arranged in two rows and two stages. A coaxial cable Cb with a center contact 81 and a shell 82 can be inserted into the cable insertion hole from one end surface.

Referring to FIG. 7, the coaxial cable Cb includes a circular center conductor Wc made of a single wire or a stranded wire, a dielectric material Di such as a fluororesin surrounding the center conductor Wc, and an external material such as a braided wire surrounding the dielectric material Di. It is composed of a conductor Wb and an insulating sheath Wi that covers and protects the outer conductor Wb. In addition, in FIG. 7, the terminal of the coaxial cable Cb is shown in a state in which the terminal has been processed.

Referring to FIG. 6 or 7, the center contact 81 has a female terminal 81t at its tip. The other end of the center contact 81 is fixed to the center conductor Wc by crimping. Furthermore, the center contact 81 holds a cylindrical dielectric 81d in the middle.

Referring to FIG. 6 or 7, the plug 8 further includes a crimp barrel 83. The crimp barrel 83 has an insulator barrel 83i at one end and a conductive barrel 83c at the other end.

Referring to FIG. 6 or 7, crimp barrel 83 can be fixed to the end of coaxial cable Cb by crimping insulator barrel 83i from the outer circumferential direction of insulating sheath Wi. By covering one end of the shell 82 over the outer conductor Wb and crimping the conductive barrel 83c from the outer circumferential direction of the one end of the shell 82, the shell 82 can be fixed to the terminal of the coaxial cable Cb, and the outer conductor Wb and the shell can be fixed. 82 can be electrically connected.

Referring to FIG. 6, the center contact 81 and the shell 82 are coaxially arranged. By providing the dielectric 81d in the middle of the center contact 81, the coaxiality between the center contact 81 and the shell 82 can be ensured.

Referring to FIG. 6, the receptacle 9 includes a rectangular parallelepiped housing 9h and a metal shell 92. Further, the receptacle 9 includes a pair of L-shaped rod-shaped center contacts 91a and 91b and a pair of dielectric bodies 93a and 93b. The dielectric 93a is integrally formed in the middle part of the center contact 91a. The dielectric 93b integrally forms the middle portion of the center contact 91b.

Referring to FIG. 6, the housing 9h holds a metal shell 92 therein. A metal shell 92 is inserted into the housing 9h from the other end toward the one end. The metal shell 92 has a support hole extending from one end surface to the other end surface. The support holes are arranged in two rows and two stages.

Referring to FIG. 6, a dielectric member 93a with a center contact 91a is inserted into the lower support hole of the metal shell 92. Further, a dielectric member 93b with a center contact 91b is inserted into the upper support hole of the metal shell 92. These dielectrics 93a and 93b are inserted from the other end side (back side) of the metal shell 92.

Referring to FIG. 6, the center contact 91a has a male terminal 91t at its tip. Similarly, the center contact 91b has a male terminal 91t at its tip. The male terminal 91t can enter the inside of the female terminal 81t and can be electrically connected to the female terminal 81t. The center contacts 91a and 91b each have a lead portion at the other end. These lead parts can be soldered to through holes provided in a printed circuit board (not shown).

Referring to FIG. 6, the receptacle 9 includes a plurality of cylindrical shells 94. The other end of the shell 94 is press-fitted into a support hole of the metal shell 92 so as to be able to come into contact with the metal shell 92 . One end of the shell 94 coaxially surrounds the male terminal 91t. When receptacle 9 and plug 8 are connected, shell 94 and shell 82 can be electrically connected.

Referring to FIG. 6, the receptacle 9 further includes a first shield plate 95 and a second shield plate 96. The first shield plate 95 is arranged to cover the back surface of the metal shell 92. The first shield plate 95 electromagnetically shields the center contact 91b via the dielectric 93b. The second shield plate 96 is arranged between the dielectric 93a and the dielectric 93b. The second shield plate 96 electromagnetically shields the center contact 91a and the center contact 91b via the dielectrics 93a and 93b.

Referring to FIG. 6, the housing 8h has a lock lever 81r. The lock lever 81r is supported by a cantilever on the upper surface of the housing 8h. The lock lever 81r extends from one end (front) of the housing 8h toward the other end (rear) along the upper surface of the housing 8h. The lock lever 81r has a locking convex portion 811 protruding from the intermediate portion (see FIG. 6(C)).

Referring to FIG. 6, the housing 9h has a latch portion 91r into which a lock lever 81r can be inserted. The latch portion 91r is essentially a receiving opening into which the lock lever 81r can be introduced.

Referring to FIG. 6(C), when the plug 8 is moved toward the receptacle 9, the lock lever 81r can enter into the latch portion 91r. Then, the locking lever 81r is elastically restored, so that the locking convex portion 811 can be locked to the inner wall of the latch portion 91r. This allows the plug 8 to be locked into the receptacle 9. By pushing the rear end of the lock lever 81r, the plug 8 and receptacle 9 can be unlocked.

Referring to FIG. 7, the plug 8 according to Patent Document 1 is composed of a so-called contact spring in which an insertion opening for a female terminal 81t provided on the tip side of the center contact 81 is divided by a slit 81s. The contact spring can alleviate "prying" that occurs when the rod-shaped male terminal 91t or the like is inserted.

However, the contact spring-shaped female terminal 81t according to the prior art shown in FIG. 7 has an outer diameter that increases toward the tip end. For this reason, referring to FIG. 6(C), fluctuations occur in the air layer interposed between the female terminal 81t and the shell 82 or metal shell 92 surrounding the female terminal 81t. Therefore, there is a concern that problems may arise in matching the characteristic impedance. Furthermore, the center contact 81 according to the prior art has many components, and there is concern that the plug 8 will be expensive.

A coaxial connector that has a center contact that connects to the center conductor of a coaxial cable, and by devising the structure of the female terminal provided at the tip of the center contact, it is possible to improve the matching of characteristic impedance and to have a simple configuration. What is needed is a coaxial connector having a center contact. The above can be said to be the problem of the present invention.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a coaxial connector that can improve characteristic impedance matching and has a center contact with a simple configuration.

The present inventors believe that by forming center contacts having female terminals equipped with contact springs with approximately the same outer diameter, matching of characteristic impedance can be improved. Based on this, we have developed a new coaxial This led to the invention of the connector.

(1) A coaxial connector according to the present invention has a coaxial cable connected to an end of a coaxial cable, which has a center conductor, a dielectric surrounding the center conductor, an outer conductor covering the dielectric, and an insulating sheath covering the outer conductor. The connector includes a cylindrical shell having an open end face, one end part of which can be introduced into a mating coaxial connector, and the other end part connected to the external conductor, and a support penetrating from one end face to the other end face. A dielectric cylinder having a hole in the center and held inside the shell, and a female terminal supported inside the support hole of the dielectric cylinder and connected to a mating male terminal at one end side. , a cylindrical center contact having a connecting terminal connected to the center conductor on the other end side, the female terminal having a contact spring divided by one or more slits, and the center contact having a contact spring divided by one or more slits; , when in contact with the mating male terminal, the outer diameter including the female terminal is approximately the same except for the connecting terminal.

(2) It is preferable that the inner wall of the insertion opening of the contact spring bulges out.

(3) The center contact may be a cylindrical contact made of a metal plate formed into a cylindrical shape, and the cylindrical contact may have an insertion opening for the contact spring folded back from an outer circumference to an inner circumference.

(4) Preferably, the coaxial connector according to the present invention further includes a crimp sleeve that crimply connects the other end of the shell to the outer conductor via the insulating sheath.

A coaxial connector according to the present invention includes a shell connected to an outer conductor, a dielectric tube held inside the shell, and a center contact connected to a center conductor, and a center contact having a female terminal provided with a contact spring is connected to the other side. Since the center contact is formed to have approximately the same outer diameter when in contact with the male terminal of the center contact, fluctuations in the outer diameter of the center contact in the axial direction can be suppressed, and matching of characteristic impedance can be improved.

1(A) is a perspective view showing the configuration of a coaxial connector according to an embodiment of the present invention, FIG. 1(A) is a state diagram in which a coaxial connector according to the embodiment and a mating coaxial connector are connected, and FIG. FIG. 3 is a state diagram before the coaxial connector according to the present invention is connected to a mating coaxial connector. 2 is a perspective view showing the configuration of the coaxial connector according to the embodiment, FIG. 2(A) is a state diagram in which the coaxial connector according to the embodiment and a mating coaxial connector are connected, and FIG. 2(B) is a diagram showing the coaxial connector according to the embodiment. FIG. 3 is a state diagram before the is connected to a mating coaxial connector. FIG. 3A is a perspective view of the coaxial connector according to the embodiment, and FIG. 3B is an exploded perspective view of the coaxial connector according to the embodiment. 4A is a left side view of the coaxial connector according to the embodiment, and FIG. 4(C) is a cross-sectional view taken along line DD in FIG. 4(A), and FIG. 4(D) is an enlarged view of the connecting portion in FIG. 4(B). . 5(A) is a left side view of the coaxial connector according to the embodiment, and FIG. 5(B) is a cross section taken along line GG in FIG. 5(A). 5(C) is a sectional view taken along the line HH in FIG. 5(A), and FIG. 5(D) is a perspective view of the coaxial connector according to the embodiment. 6(A) is a right side view of the coaxial connector assembly, FIG. 6(B) is a rear view of the coaxial connector assembly, and FIG. ) is a sectional view taken along the line XX in FIG. 6(B). FIG. 2 is a perspective exploded view showing the internal structure of a plug constituting a coaxial connector assembly according to the prior art.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Coaxial connector configuration]
First, the configuration of a coaxial connector according to an embodiment of the present invention will be described.

Note that components designated by the same reference numerals as those used in the prior art have the same functions, so their explanations may be omitted below.

(overall structure)
Referring to FIGS. 1 to 6, a coaxial connector (hereinafter referred to as a plug) 10 according to an embodiment of the present invention is connected to a terminal of a coaxial cable Cb. The coaxial cable Cb includes a center conductor Wc, a dielectric Di surrounding the center conductor Wc, an outer conductor Wb covering the dielectric Di, and an insulating sheath Wi covering the outer conductor Wb.

Referring to FIG. 1 or FIGS. 2 and 4, the plug 10 can be detachably connected to a mating coaxial connector (hereinafter referred to as a receptacle) 20. The receptacle 20 can be mounted, for example, on a printed circuit board (not shown).

Referring to FIGS. 1 to 6, the plug 10 includes a cylindrical shell 1, a dielectric tube 3, and a cylindrical center contact 5. The shell 1 has one end face open. The shell 1 can be introduced into the receptacle 20 at one end thereof. Further, the other end of the shell 1 is connected to the outer conductor Wb by crimping.

Referring to FIG. 3 or 5, the dielectric tube 3 has a support hole 3h in the center. The support hole 3h penetrates the dielectric tube 3 from one end surface to the other end surface. The dielectric tube 3 can be inserted from one end surface of the shell (see FIG. 3(B)). The dielectric cylinder 3 is held inside the shell 1.

Referring to FIGS. 3 to 5, the center contact 5 is supported inside the support hole 3h of the dielectric tube 3. As shown in FIG. The center contact 5 has a female terminal 5t at one end. The female terminal 5t can be connected to a mating male terminal 6t (see FIG. 4(C) or FIG. 4(D)). Moreover, the center contact 5 has a connecting terminal 5c on the other end side. The connection terminal 5c is connected to the center conductor Wc. In the embodiment, the connection terminal 5c is a crimp terminal.

Referring to FIG. 3(B) or FIG. 5(C), the female terminal 5t has a contact spring Eo divided by a slit 5s. The inner wall of the insertion opening of the contact spring Eo is bulged (see FIG. 4(D)).

Referring to FIG. 3(B) or FIG. 4 and FIG. 5(C), when the center contact 5 is in contact with the mating male terminal 6t, the center contact 5 has approximately the same outer diameter D excluding the connecting terminal 5c and including the female terminal 5t. It is formed by By suppressing fluctuations in the outer diameter D of the center contact 5 in the axial direction, reflected waves of signals transmitted through the center contact 5 can be suppressed, and characteristic impedance matching can be improved.

(Configuration of mating connector)
Next, the configuration of the receptacle 20, which is the mating connector, will be explained. Referring to FIG. 1 or FIGS. 2 and 4, the receptacle 20 includes a metal shell 2, a dielectric tube 4, and a center contact 6.

Referring to FIG. 1, FIG. 2, and FIG. 4, the metal shell 2 has a rectangular parallelepiped-shaped main body 2b and a cylindrical portion 2c. The metal shell 2 has a support hole 2h in the center (see FIG. 1(B)). The support hole 2h penetrates from the distal end surface of the cylindrical portion 2c toward the bottom surface of the main body 2b.

Referring to FIG. 4, a dielectric cylinder 4 is supported inside the support hole 2h of the metal shell 2. The dielectric tube 4 holds the center contact 6 at its center. The center contact 6 has a male terminal 6t at one end. The other end of the center contact 6 is press-fitted into the center of the dielectric cylinder 4, for example. The male terminal 6t is arranged so as to protrude from one end surface of the dielectric cylinder 4.

Referring to FIG. 4, the dielectric cylinder 4 with the center contact 6 can be inserted from the bottom side of the main body 2b. In a state where the dielectric tube 4 is held inside the metal shell 2, the male terminal 6t is arranged facing inside the cylindrical portion 2c.

Referring to FIG. 1 or FIGS. 2 and 4, when the plug 10 is moved toward the receptacle 20, the distal end side of the plug 10 can be introduced into the cylindrical portion 2c. The male terminal 6t can relatively enter the inside of the female terminal 5t, and can be electrically connected to the female terminal 5t. Further, the metal shell 2 and the shell 1 can be electrically connected by relatively entering the inside of the cylindrical portion 2c.

Continuing, the configuration of the plug 10 will be explained. Referring to FIGS. 1 to 6, the plug 10 further includes a crimp sleeve 7. As shown in FIGS. Referring to FIG. 4 or 5, the other end of the shell 1 is inserted between the dielectric Di and the outer conductor Wb. By crimping the crimp sleeve 7 to the end of the coaxial cable Cb via the insulating sheath Wi, the other end of the shell 1 can be electrically connected to the external conductor Wb. Further, by crimping the crimp sleeve 7 to the end of the coaxial cable Cb via the insulating sheath Wi, the plug 10 can be fixed to the end of the coaxial cable Cb.

(Central contact configuration)
Next, the configuration of the center contact 5 according to the embodiment will be explained. Referring to FIGS. 3 to 5, the center contact 5 is made of a conductive metal plate, and a cylindrical contact can be obtained by molding a conductive spread plate.

Referring to FIG. 3(B) or FIG. 5(B), in the center contact 5, the insertion opening for the contact spring Eo of the female terminal 5t is folded back from the outer circumference to the inner circumference. Thereby, the outer diameter D of the female terminal 5t can be substantially converged to the outer diameter D of the center contact 5 when it comes into contact with the mating male terminal 6t. The center contact 5 according to the embodiment discloses a cylindrical contact made of a metal plate formed into a cylindrical shape. It can also be constructed from processed contacts.

Further, referring to FIGS. 3 to 5, the female terminal 5t according to the embodiment discloses a contact spring Eo that is divided into halves, but the contact spring Eo is divided into three parts within a range that does not exceed its outer diameter D. Alternatively, a cross-shaped slit may be provided to divide it into four parts.

[Effect of coaxial connector]
Next, the action and effect of the plug 10 according to the embodiment will be explained. Referring to FIGS. 1 to 5, a plug 10 according to the embodiment includes a shell 1 connected to an outer conductor Wb, a dielectric cylinder 3 held inside the shell 1, and a center contact 5 connected to a center conductor Wc. Since the center contact 5 having the female terminal 5t provided with the contact spring Eo is formed to have approximately the same outer diameter D when in contact with the mating male terminal 6t, fluctuations in the outer diameter of the center contact 5 in the axial direction can be avoided. It is possible to improve the matching of characteristic impedance.

Referring to FIGS. 3 to 5, the plug 10 according to the embodiment forms a center contact 5 with substantially the same outer diameter D excluding the connecting terminal 5c and including the female terminal 5t when in contact with the mating male terminal 6t. ing. By suppressing fluctuations in the outer diameter D of the center contact 5 in the axial direction, reflected waves of signals transmitted through the center contact 5 can be suppressed, and the electric current is Voltage Standing Wave Ratio (VSWR) can be improved.

Also, referring to FIGS. 1-5, the plug 10 according to the embodiment has an advantage over the prior art center contact 81 in that it uses fewer components for improved high frequency performance.

Furthermore, referring to FIGS. 1 to 5, the plug 10 according to the embodiment has the effect that high frequency performance is not affected even if the female terminal 5t is rotated 90 degrees around the axis and fitted to the male terminal 6t. There is.

The present invention has disclosed a coaxial connector for a single-wire coaxial cable that can be mounted on a printed circuit board and is detachable from a mating coaxial connector, but the present invention can also be applied to a multicore coaxial connector connected to the terminals of a plurality of coaxial cables. You can also do it.

1 Shell 3 Dielectric tube 3h Support hole 5 Center contact 5c Connection terminal 5s Slit 5t Female terminal 6t Male terminal 10 Plug (coaxial connector)
20 Receptacle (Mating coaxial connector)
Cb Coaxial cable D Outer diameter Di Dielectric Eo Contact spring Wb Outer conductor Wc Center conductor Wi Insulation sheath Wc Center conductor

Claims (1)

A coaxial connector connected to a terminal of a coaxial cable having a center conductor, a dielectric surrounding the center conductor, an outer conductor covering the dielectric, and an insulating sheath covering the outer conductor,
a cylindrical shell having one end surface open, one end capable of being introduced into a mating coaxial connector, and the other end connected to the external conductor;
a dielectric cylinder held inside the shell and having a support hole penetrating from one end face to the other end face in the center;
A cylindrical tube that is supported inside the support hole of the dielectric tube, has a female terminal at one end that can be connected to a mating male terminal, and has a connecting terminal connected to the center conductor at the other end. a center contact;
The female terminal has a contact spring divided by one or more slits,
The center contact is formed to have substantially the same outer diameter including the female terminal, excluding the connection terminal, when making contact with the male terminal of the other party ,
The contact spring has a bulging inner wall at its insertion opening;
The center contact is a cylindrical contact made of a metal plate formed into a cylindrical shape,
The cylindrical contact is a coaxial connector in which the insertion opening for the contact spring is folded back from the outer circumference to the inner circumference .

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