JPH0633073U - Coaxial probe contact pin connection terminal - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a coaxial probe contact pin connection terminal with an improved outer diameter and a reduced mounting density. An insulator in which the outer diameter of the socket tube 31 of the probe contact pin 10 which is an inner conductor and the inner diameter of the outer tube 22 which is an outer conductor are provided at two positions between the outer tube 22 and the socket tube 31. A coaxial probe contact pin connection terminal in which the overall relative permittivity ε _r between the inner conductor and the outer conductor is reduced by holding it by the spacer 60 to form a cavity.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coaxial probe contact pin connecting terminal, and more particularly to a coaxial probe contact pin connecting terminal having a small outer diameter.

[0002]

[Prior art]

When transmitting a highly accurate electric signal, it is necessary to maintain the characteristic impedance of the coaxial probe contact pin connection terminal strictly. Here, the characteristic impedance: Z ₀ is as follows. Z ₀ = (60 / √ε _r ) ln R ₂ / R ₁ (1) where R ₁ is the outer diameter of the inner conductor, R _{2 is} the inner diameter of the outer conductor, and ε _r is the relative permittivity of the insulator. .

In order to improve the packaging density of the coaxial probe contact pin connection terminal, the outer diameter of the connection terminal must be small. It goes without saying that the characteristic impedance Z ₀ must be kept constant as it is when the outer diameter of the connection terminal is made small, that is, when the inner diameter R ₂ is made small. In the formula (1), in order to reduce the inner diameter R ₂ and keep the characteristic impedance Z ₀ constant, it is necessary to decrease the outer diameter R ₁ and the relative permittivity ε _r of the insulator.

The outer diameter R ₁ has a tendency to decrease. This means to reduce the outer diameter of the probe contact pin in the coaxial probe contact pin connection terminal 1. However, the probe contact pin shown in FIG. 3 has been conventionally used, and it is not easy to reduce the outer diameter of the probe contact pin for various reasons. This will be described with reference to FIG. 3. Reference numeral 1 denotes the entire coaxial probe contact pin connection terminal. The coaxial probe contact pin connection terminal 1 includes a probe contact pin 10 which is an inner conductor contact portion which is connected to an inner conductor 41 of the coaxial cable 40, an outer conductor contact portion 20 which is connected to an outer conductor 42 of the coaxial cable 40, And an insulator 30 interposed between the probe contact pin 10 and the outer conductor contact portion 20 to electrically insulate the two. Reference numeral 31 denotes a socket tube, which is electrically and mechanically coupled to and holds the probe contact pin 10, and the inner conductor 41 of the coaxial cable 40 is electrically connected by, for example, soldering.

The probe contact pin 10 includes a plunger 11 having a tip at its tip, a ball 12 ₁ , a spring 13, a ball 12 ₂ , and a tube 14 for holding these in an axially slidable arrangement as shown in the drawing. Consists of The spring 13 is a biasing spring that drives the plunger 11 relatively leftward with respect to the tube 14 via the ball 12 ₁ .

The outer conductor contact portion 20 includes an outer ring 21, an outer tube 22, and an outer spring 23. The outer spring 23 is a spring that drives the outer ring 21 relatively leftward with respect to the outer tube 22. The outer conductor 42 of the coaxial cable 40 is electrically connected to the outer tube 22 by, for example, soldering.

[0007]

[Problems to be solved by the device]

Probe contact pins 10 described above, the plunger 11, the ball 12 _1, spray ring 13, ball 12 _2, and is slidably arranged and held in the axial direction as illustrated them be those made of tubes 14 Due to the complexity of the geometric structure, it is generally not easy to reduce its outer diameter.

The present invention is directed to a coaxial probe contact pin connection in which the outer diameter is reduced by decreasing the relative permittivity ε _r of the insulator existing between the inner conductor and the outer conductor of the coaxial probe contact pin connection terminal. It provides a terminal.

[0009]

[Means for Solving the Problem] Between the outer diameter of the socket tube 31 of the probe contact pin 10 which is the inner conductor and the inner diameter of the outer tube 22 which is the outer conductor, there are two portions between the outer tube 22 and the socket tube 31. A coaxial probe contact pin connection terminal was constructed in which the overall relative permittivity ε _r between the inner and outer conductors was reduced by holding it in a cavity with an insulator spacer provided at the location.

[0010]

【Example】

An embodiment of this invention will be described with reference to FIG. The outer diameter of the socket tube 31 of the probe contact pin 10 which is the inner conductor and the inner diameter of the outer tube 22 which is the outer conductor are held by insulating spacers provided at two positions between the outer tube 22 and the socket tube 31. Then, by forming a cavity, the overall relative permittivity ε _r between the inner conductor and the outer conductor is reduced.

As the probe contact pin 10, a probe contact pin recently developed by the applicant for the utility model as shown in FIG. 2 can be adopted. Here, 11 is a plunger, 15 is a spiral spring, 16 is a shaft, and 31 is a socket tube.

[0012]

[Effect of device]

 As described above, the coaxial probe contact pin connecting terminal of the present invention maintains the insulating gap between the outer tube 22 and the socket tube 31 by the insulating spacers 60 provided at two positions. Therefore, most of it is occupied by the atmosphere, and the relative permittivity of the entire gap can be made smaller than when the gap is occupied by an insulator other than the atmosphere. Therefore, as the relative permittivity of the entire gap between the outer tube 22 and the socket tube 31 can be reduced, the outer diameter of the coaxial probe contact pin connecting terminal can be correspondingly reduced. This leads to an increase in the packaging density of coaxial probe contact pin connection terminals.

[Brief description of drawings]

FIG. 1 is a view showing a coaxial probe contact pin connection terminal of the present invention.

FIG. 2 is a view showing an example of a probe contact pin.

FIG. 3 is a diagram showing a conventional example.

[Explanation of symbols]

 10 Probe contact pin which is an inner conductor 22 Outer tube which is an outer conductor 31 Socket tube 60 Insulator spacer

Claims (1)

[Scope of utility model registration request] 1. An insulator spacer provided between the outer diameter of the socket tube of the probe contact pin, which is the inner conductor, and the inner diameter of the outer tube, which is the outer conductor, is provided at two locations between the outer tube and the socket tube. The coaxial probe contact pin connecting terminal is characterized in that the relative permittivity of the whole between the inner conductor and the outer conductor is reduced by forming a hollow.