Miniaturized coaxial contact element

Abstract

A miniaturized coaxial contact comprises a pin end contact and a jack end contact, the pin end contact comprises a first inner conductor and a first outer conductor, the jack end contact comprises a second inner conductor and a second outer conductor, and insulating media are arranged between the first inner conductor and the first outer conductor and between the second inner conductor and the second outer conductor; the first inner conductor is a first spring needle, and the first outer conductor is a first annular metal piece surrounding the first spring needle; the second inner conductor is a columnar metal piece and is used for being in axial elastic contact with the first spring needle, the second outer conductor comprises a second annular metal piece surrounding the columnar metal piece and a second spring needle, and the second spring needle is installed in the second annular metal piece; and the contact needle head of the second spring needle is exposed and is used for axially and elastically contacting with the contact end of the first annular metal piece. According to the utility model, the structure of the coaxial contact assembly is simplified, and miniaturization of the contact element is facilitated.

Description

Technical Field

[0001] The utility model belongs to the field of coaxial connectors, and in particular relates to a miniaturized coaxial contact piece. Background Art

[0002] Coaxial contacts are commonly used in high-precision and high-reliability radio frequency transmission systems. They are combined with other structures (such as housings and insulators) to form mixed high- and low-frequency connectors or multi-core coaxial connectors. They are widely used in aerospace, communications, medical, rail transit, and industrial fields. With the advent of the big data era, various fields are pursuing miniaturized, integrated, and flexible equipment. The development of coaxial contacts is also showing a trend towards miniaturization and longer lifespan.

[0003] The existing high-life coaxial contacts have wire spring hole structures inside and outside. The basic components of high-frequency contacts are inner conductor, outer conductor surrounding the inner conductor, and insulating support for transmitting high-frequency signals (air can also be used as an insulating medium). Figure 1 As shown, the coaxial contact comprises a mating pin 1 and socket 2. Pin 1 has a pin inner conductor 101 and a pin cylindrical outer conductor 102, while socket 2 has a socket inner conductor 201 and a socket outer conductor 202. Both socket inner conductor 201 and socket outer conductor 202 serve as spring holes. When mated, the pin inner conductor 101 contacts the spring hole of the socket inner conductor 201, and the pin cylindrical outer conductor 102 contacts the spring hole of the socket outer conductor 202. The spring wires in the spring holes continuously provide reliable radial contact force to the pin.

[0004] Figure 1 The structure shown has the following disadvantages: (1) The degree of miniaturization of the wire spring hole is limited, and the outer conductor has a multi-layer structure in the radial direction, which is not conducive to the miniaturization and integration of the contact parts; (2) After the contact parts of this structure are miniaturized, the wire spring wire of the wire spring hole is thin and fragile, and is easy to break after repeated plugging and unplugging; (3) The pin and socket structure is complex, the processing efficiency is low, the process is complicated, and the cost is high. Utility Model Content

[0005] The purpose of the utility model is to provide a miniaturized coaxial contact piece, eliminate the contact mode of the wire spring hole, simplify the structure of the coaxial contact piece, and facilitate the miniaturization of the contact piece.

[0006] In order to achieve the above-mentioned objectives, the technical solution adopted by the present invention is: a miniaturized coaxial contact, including a pin end contact and a socket end contact that match each other, the pin end contact including a first inner conductor and a first outer conductor, the socket end contact including a second inner conductor and a second outer conductor, an insulating medium is provided between the first inner conductor and the first outer conductor and between the second inner conductor and the second outer conductor, the first inner conductor is a first spring pin, the first outer conductor is a first annular metal part surrounding the first spring pin, and the contact end surface of the first annular metal part is an annular plane; the second inner conductor is a cylindrical metal part, which is used to axially elastically contact with the first spring pin, the second outer conductor includes a second annular metal part and a second spring pin, the second annular metal part surrounds the cylindrical metal part, the second spring pin is installed in the second annular metal part, the contact needle tip of the second spring pin is exposed from the contact end of the second annular metal part, and is used to axially elastically contact with the contact end of the first annular metal part.

[0007] Furthermore, a first spring pin support body is provided outside the first spring pin.

[0008] Furthermore, the first spring pin support body is a cylindrical structure and is provided with a mounting groove for accommodating the first spring pin, and the contact pin head of the first spring pin extends from the end of the mounting groove.

[0009] Furthermore, a second spring pin support body is provided outside the second spring pin.

[0010] Furthermore, the second spring pin support body is a cylindrical structure and is provided with a mounting groove for accommodating the second spring pin, and the contact pin head of the second spring pin extends from the end of the mounting groove.

[0011] Furthermore, the second spring pins are provided in plurality and are arranged at intervals along the circumference of the second annular metal member.

[0012] Furthermore, the plurality of second spring pins are centrally symmetrically distributed within the second annular metal member.

[0013] As an option, the insulating medium is an insulating support.

[0014] Alternatively, the insulating medium is air.

[0015] The beneficial effects of the present invention are: 1. In the prior art, the inner conductor of the pin at the pin end has a variable diameter, and the contact with the inner conductor of the jack at the jack end requires the inner conductor of the pin to be inserted into the inner conductor of the jack, so it is a long-distance contact of a slender needle, which on the one hand affects the miniaturization of the axial size, and on the other hand requires high processing accuracy and assembly accuracy, and a slight deflection or tilt during insertion will cause the pin to hit; in the present invention, the contact piece at the pin end adopts a spring pin as the inner conductor, the spring pin has no variable diameter, and the radio frequency transmission impedance is more stable, and a columnar metal piece is provided on the jack end contact piece to elastically contact the spring pin in the axial direction, and it is an end-face contact, so it can not only achieve axial size compression to meet the demand for product miniaturization, but also reduce the product processing and assembly accuracy, with a certain radial tolerance, and can achieve end-to-end contact between the spring pin and the columnar metal piece even if deflection or tilt occurs during insertion.

[0016] 2. In the prior art, both the inner and outer conductors of the jack end adopt a wire spring hole structure. This structure is a multi-layer structure in the radial direction and is not easy to miniaturize. In the present invention, not only the wire spring holes are eliminated for the two inner conductors, but also for the jack end contact. Instead, multiple spring pins are arranged in an annular metal part. This helps to compress the radial size of the contact and achieve miniaturization of the contact.

[0017] 3. The present invention incorporates a cylindrical first spring pin support body mounted outside the first spring pin, allowing the first spring pin's fixed point to move forward, closer to the end face of the contact element. This prevents significant radial vibration of the first spring pin's contact tip during mating or vibration conditions, thereby ensuring more stable and reliable contact. Similarly, the second spring pin, also mounted within the second spring pin support body, also serves to reduce vibration and ensure reliable contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a coaxial contact in the prior art;

[0019] Figure 2 This is a schematic structural diagram of the utility model in Example 1;

[0020] Figure 3 This is a schematic structural diagram of the utility model in Example 2;

[0021] Markings in the figure: 1, pin, 101, pin inner conductor, 102, pin cylindrical outer conductor, 2, jack, 201, jack inner conductor, 202, jack outer conductor;

[0022] 3. Pin end contact, 301. First spring pin, 302. First annular metal part, 303. First insulating support, 304. First spring pin support, 4. Jack end contact, 401. Columnar metal part, 402. Second spring pin, 403. Second annular metal part, 404. Second insulating support. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention in any way.

[0024] Example 1: Refer to the attached Figure 2 Figure 1 shows a miniaturized coaxial contact comprising a pin contact 3 and a socket contact 4. The pin contact 3 is provided with a first inner conductor and a first outer conductor surrounding the first inner conductor, while the socket contact 4 is provided with a second inner conductor and a second outer conductor surrounding the second inner conductor. An insulating medium is provided between the first inner conductor and the first outer conductor, and between the second inner conductor and the second outer conductor. In this embodiment, an insulating support is used as the insulating medium; in other embodiments, air can also be used as the insulating medium.

[0025] In the pin-end contact 3, the first inner conductor is a first spring pin 301, and the first outer conductor is a first annular metal member 302 surrounding the first spring pin 301. A first insulating support 303 is disposed between the first spring pin 301 and the first annular metal member 302. The first spring pin 301 passes through the first insulating support 303, and the contact tip at the front end of the first spring pin 301 is exposed from the end surface of the first insulating support 303, for end-to-end contact with the second inner conductor of the jack-end contact 4. The first annular metal member 302 is a metal cylinder with a cylindrical side surface. The contact end surface of the first annular metal member 302 is an annular flat surface for contact with the second outer conductor.

[0026] The first spring needle 301 includes a spring needle tube, a spring and a contact needle head. The spring and the contact needle head are installed in the spring needle tube. The tail end of the spring needle tube needs to be left with a large length for wiring.

[0027] In the jack contact 4, the second inner conductor is a cylindrical metal member 401, which is used to elastically contact the contact tips of the first spring pins 301 in an axial direction. This axial elastic contact means that when the pin contact 3 and the jack contact 4 are mated, the cylindrical metal member 401 contacts the first spring pins 301, causing the contact tips of the first spring pins 301 to be axially compressed and retracted. This contact tip compresses the spring to generate an elastic force, which, under the reaction of the elastic force, maintains the cylindrical metal member 401 in reliable contact with the first spring pins 301. The second outer conductor comprises a second annular metal member 403 and a plurality of second spring pins 402, which are evenly spaced along the circumference and mounted within the second annular metal member 403. The contact tips of the second spring pins 402 are exposed from the contact ends of the second annular metal member 403, and are used to elastically contact the contact end surfaces of the first annular metal member 302 in an axial direction. A second insulating support 404 is provided between the cylindrical metal member 401 and the second annular metal member 403.

[0028] Example 2: In Example 1, the spring pin tube of the first spring pin 301 is directly installed in the first insulating support 303. In this case, a convex bump is provided on the surface of the spring pin tube, serving as a fixed point of contact with the first insulating support 303. The spring pin tube is generally stamped. When providing the convex bump, in order to avoid affecting the rebound of the contact pin, it is necessary to place the convex bump behind the contact pin. This makes the fixed point farther from the end face of the pin end contact 3. The front end of the first spring pin 301 has a large swing amplitude of the contact pin, and the convex bump is in point contact with the first insulating support 303. The interference between the convex bump and the first insulating support 303 must be strictly controlled. Otherwise, the first spring pin 301 may slip, affecting the contact with the jack end contact 4.

[0029] In order to further solve the above problem, a preferred solution of Example 2 is proposed based on Example 1.

[0030] Refer to the attached Figure 3 Figure 1 shows a miniaturized coaxial contact comprising a pin contact 3 and a socket contact 4. The pin contact 3 is provided with a first inner conductor and a first outer conductor surrounding the first inner conductor, while the socket contact 4 is provided with a second inner conductor and a second outer conductor surrounding the second inner conductor. An insulating medium is provided between the first inner conductor and the first outer conductor, and between the second inner conductor and the second outer conductor. In this embodiment, an insulating support is used as the insulating medium.

[0031] In the pin-end contact 3, the first inner conductor is a first spring pin 301, and the first outer conductor is a first annular metal member 302 surrounding the first spring pin 301. A first insulating support 303 is disposed between the first spring pin 301 and the first annular metal member 302. A first spring pin support 304 is disposed outside the first spring pin 301. The first spring pin support 304 is a cylindrical structure, with the outer surface of the first spring pin support 304 in contact with the inner surface of the first insulating support 303. The first spring pin support 304 is provided with a mounting slot for accommodating the first spring pin 301. The contact tip of the first spring pin 301 extends from the end of the mounting slot, configured to make end-to-end contact with the second inner conductor of the jack-end contact 4.

[0032] In this embodiment, after the first spring pin support 304 is provided, barbs are provided on the outer surface of the first spring pin support 304. The barbs are fixed to the first insulating support 303, thereby securing the first spring pin to the first insulating support 303. Therefore, the barbs on the first spring pin support 304 can be positioned forward of the contact pin head, so that the fixed position of the first spring pin 301 is closer to the end face of the pin end contact 3. This can reduce the swing amplitude of the first spring pin 301 and ensure reliable and stable contact between the first spring pin 301 and the second inner conductor. The first annular metal member 302 is a metal cylinder with a cylindrical side surface. The contact end face of the first annular metal member 302 is an annular flat surface, which is used to contact the second outer conductor.

[0033] In the jack contact 4, the second inner conductor is a cylindrical metal member 401, which is configured to elastically contact the contact tips of the first spring pins 301 in an axial direction. The second outer conductor comprises a second annular metal member 403 and a plurality of second spring pins 402. The plurality of second spring pins 402 are evenly spaced along the circumference of a second spring pin support member mounted within the second annular metal member 403. The second spring pin support member has the same structure as the first spring pin support member. The contact tips of the second spring pins 402 are exposed from the contact end of the second annular metal member 403, and are configured to elastically contact the contact end face of the first annular metal member 302 in an axial direction. A second insulating support member 404 is disposed between the cylindrical metal member 401 and the second annular metal member 403.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the specific implementation methods of the present invention can be modified or replaced with equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A miniaturized coaxial contact, comprising a pin end contact (3) and a socket end contact (4) that are mated with each other, the pin end contact (3) comprising a first inner conductor and a first outer conductor, the socket end contact (4) comprising a second inner conductor and a second outer conductor, an insulating medium being provided between the first inner conductor and the first outer conductor and between the second inner conductor and the second outer conductor, characterized in that: The first inner conductor is a first spring needle (301), the first outer conductor is a first annular metal part (302) surrounding the first spring needle (301), and the contact end face of the first annular metal part (302) is an annular plane; the second inner conductor is a columnar metal part (401) for axially elastically contacting the first spring needle (301), the second outer conductor comprises a second annular metal part (403) and a second spring needle (402), the second annular metal part (403) surrounds the columnar metal part (401), the second spring needle (402) is installed in the second annular metal part (403), the contact needle head of the second spring needle (402) is exposed from the contact end of the second annular metal part (403), and is used for axially elastically contacting the contact end of the first annular metal part (302).

2. The miniaturized coaxial contact according to claim 1, wherein: A first spring pin support body (304) is provided outside the first spring pin (301).

3. The miniaturized coaxial contact according to claim 2, wherein: The first spring needle support body (304) is a cylindrical structure and is provided with a mounting groove for accommodating the first spring needle (301), and the contact needle head of the first spring needle (301) extends from the end of the mounting groove.

4. The miniaturized coaxial contact according to claim 1, wherein: A second spring pin support body is provided outside the second spring pin (402).

5. The miniaturized coaxial contact according to claim 4, characterized in that: The second spring needle support body is a cylindrical structure and is provided with a mounting groove for accommodating the second spring needle (402), and the contact needle head of the second spring needle (402) extends from the end of the mounting groove.

6. The miniaturized coaxial contact according to claim 1, wherein: The second spring needles (402) are provided in plurality and are arranged at intervals along the circumference of the second annular metal member (403).

7. The miniaturized coaxial contact according to claim 6, characterized in that: The plurality of second spring needles (402) are centrally symmetrically distributed within the second annular metal part (403).

8. The miniaturized coaxial contact according to claim 1, wherein: The insulating medium is an insulating support.

9. The miniaturized coaxial contact according to claim 1, characterized in that: The insulating medium is air.

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