A kind of jig for Kelvin four-wire test of ultra-micro RC component

Abstract

The utility model relates to RC component test technical field especially a kind of fixture for supermicro RC component kelvin four-wire test, including test seat, upper cover and floating pressing plate, the test seat includes base, support seat and four probes, the support seat is fixed on base, and the top of support seat is equipped with test cavity, the bottom wall of test cavity is equipped with test groove and four longitudinal installation grooves, the installation groove is distributed in the four corners of test groove and with test groove partially coincides;Four probes are respectively arranged in installation groove, and the upper end of probe is supported the top wall of installation groove and extends into test groove, and the lower end of probe extends to the outside of base;The depth of test groove is greater than RC component thickness, and the distance between the upper end of probe and the bottom wall of test cavity is less than RC component thickness;The floating pressing plate is movably arranged on the upper cover to hold RC component with probe, and the utility model can realize the safe, stable and accurate kelvin four-wire method test of supermicro RC component.

Description

Technical Field

[0001] This utility model relates to the field of RC element testing technology, specifically to a fixture for Kelvin four-wire testing of ultra-miniature RC elements. Background Technology

[0002] Ultra-miniature RC components refer to resistors and capacitors with extremely small dimensions. They are key passive components in modern electronic circuits, especially in high-density, miniaturized electronic products such as smartphones, wearable devices, medical implants, aerospace electronics, and advanced communication modules.

[0003] Currently, the testing of ultra-miniature RC components has the following shortcomings: traditional testing methods are prone to damage or scratches due to mechanical pressure; the accuracy of electrical measurement data is insufficient, and the four-wire method test requires ensuring stable contact between the probe and the component electrode; the components are small, manual placement is inefficient and prone to misalignment, and insufficient heat dissipation during the testing process may affect parameter stability. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a fixture for Kelvin four-wire testing of ultra-miniature RC components, which can realize safe, stable and accurate Kelvin four-wire testing of ultra-miniature RC components.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fixture for Kelvin four-wire testing of ultra-miniature RC elements, comprising a test base, a top cover movable onto the test base, and a floating pressure plate. The test base includes a base, a support base, and four probes. The support base is fixed to the base, and a test cavity is provided at the top of the support base. The bottom wall of the test cavity has a test groove and four longitudinal mounting grooves. The mounting grooves are distributed at the four corners of the test groove and partially overlap with the test groove. The four probes are respectively disposed in the mounting grooves. The upper ends of the probes abut against the top wall of the mounting grooves and extend into the test grooves to form a four-point coplanar support platform. The lower ends of the probes extend outside the base. The depth of the test groove is greater than the thickness of the RC element, and the distance between the upper end of the probe and the bottom wall of the test cavity is less than the thickness of the RC element. The floating pressure plate is movably disposed on the top cover to cooperate with the probes in pressing the RC element.

[0006] Preferably, the bottom wall of the test chamber is provided with an annular heat dissipation groove surrounding the test slot, and the heat dissipation groove is interconnected with the mounting slot to form a continuous heat dissipation channel.

[0007] Preferably, the top wall of the mounting groove is provided with a fan-shaped through hole, which is connected to the heat dissipation groove.

[0008] Preferably, the floating pressure plate includes a pressure plate body and a columnar pressure block disposed at the lower end of the pressure plate body, the pressure block forming a pressing part and being arranged perpendicular to the test groove.

[0009] Preferably, the lower part of the upper cover has a receiving groove, and a rotating shaft is provided in the receiving groove. The pressure plate body is movably suspended in the receiving groove through the rotating shaft, and the pressure plate body is located on the lower side of the top wall of the receiving groove.

[0010] Preferably, the test seat further includes a frame-shaped fixing seat fixedly mounted on the base, the fixing seat having an open positioning cavity in the middle, and a support seat disposed in the positioning cavity; a latch is provided at the right end of the fixing seat; the left end of the upper cover is hinged to the fixing seat; and a buckle that cooperates with the latch is provided at the right end of the upper cover.

[0011] Preferably, the test seat further includes several positioning pins disposed on the base, with the upper part of the positioning pin sliding through the support seat and the lower part of the positioning pin extending to the bottom of the base.

[0012] Preferably, the mounting groove and the sector-shaped through hole are coaxial.

[0013] Preferably, the fixing seat and the base are fixed together by bolts.

[0014] Preferably, the top wall of the receiving tank is provided with a plurality of evenly distributed observation windows.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This fixture achieves safe, stable and accurate Kelvin four-wire method testing of ultra-miniature RC components through the support base structure (test slot, fan-shaped through hole, mounting slot), independent four-probe platform, pressure plate system with floating mechanism (pressure plate body gap + rotating shaft) and reliable buckle locking mechanism. In addition, while ensuring the electrical connection accuracy, this fixture also effectively protects the fragile ultra-miniature devices through the floating clamping mechanism. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the exploded structure of the test fixture of this utility model;

[0017] Figure 2 This is a schematic diagram of the support structure of this utility model;

[0018] Figure 3 This is a structural schematic diagram of the support base and the fixing base of this utility model;

[0019] Figure 4 For the present utility model Figure 3 Schematic diagram of the structure at point A;

[0020] Figure 5 This is a schematic diagram of the upper cover structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the floating pressure plate structure of this utility model.

[0022] In the diagram: 1. Base, 2. Support, 3. Probe, 4. Fixing base, 5. Top cover, 6. Floating pressure plate, 7. Positioning pin, 8. Connecting shaft, 9. Buckle, 10. RC component, 11. Bolt, 21. Test chamber, 22. Heat dissipation slot, 23. Test slot, 24. Fan-shaped through hole, 25. Mounting slot, 41. Tongue, 42. Positioning cavity, 51. Top cover body, 52. Rotating shaft, 511. Receiving slot, 512. Observation window, 61. Pressure plate body, 62. Pressure block. Detailed Implementation

[0023] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice this utility model. Although this utility model has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative and not intended to limit the scope of this utility model.

[0024] See Figure 1-6 In one embodiment of this utility model, a fixture for Kelvin four-wire testing of an ultra-miniature RC element includes: a test seat, an upper cover 5 that is mounted on the test seat and hinged to the test seat, a floating pressure plate 6 for pressing the ultra-miniature RC element 10 in conjunction with the test seat, and a buckle 9 for locking the upper cover 5 in the test seat position. The floating pressure plate 6 and the buckle 9 are both movably mounted on the upper cover 5.

[0025] Specifically, the test fixture includes a base 1, a support 2, four probes 3, a fixing seat 4, and several bolts 11. The base 1 provides overall support, and four vertically arranged positioning pins 7 are provided on the base 1. The support 2 is fixed to the upper end of the base 1 by the positioning pins 7 and the bolts 11. The upper part of the positioning pin 7 slides through the support 2. The function of the positioning pin 7 is to quickly position the support 2 during assembly, thereby improving assembly efficiency. In addition, the lower end of the positioning pin 7 extends to the bottom of the base 1 and can act as a support foot of the base 1.

[0026] The support base 2 is a block-shaped structure, with a test cavity 21 opened in the middle of its upper end. A heat dissipation groove 22 and a test groove 23 are opened on the bottom wall of the test cavity 21. Figure 4 (The area shown in the square dashed box) The lower part of the support base 2 is also provided with four mounting slots 25 that are connected to the test slot 23 in a longitudinal direction; the depth of the test slot 23 is greater than the thickness of the RC element 10, which is used for the precise positioning of the RC element 10; the heat dissipation slot 22 is a ring-shaped strip structure that surrounds the test slot 23 and is interconnected with the test slot 23 and the mounting slots 25 to form a continuous heat dissipation channel.

[0027] Four mounting slots 25 are distributed at the four corners of the test slot 23, and each mounting slot 25 partially overlaps with the test slot 23. A fan-shaped through hole 24 is coaxially opened on the top wall of each mounting slot 25, so that the upper part of the mounting slot 25 is open, and the fan-shaped through holes 24 are close to the test slot 23. The open structure is more conducive to heat dissipation.

[0028] Four probes 3 are respectively installed in four mounting slots 25. The outer diameter of the probe 3 is adapted to the inner diameter of the mounting slot 25. The contact end (upper end) of the probe 3 abuts against the top wall of the mounting slot 25 to ensure installation accuracy and stability. At this time, the upper ends of the four probes 3 extend into the test slot 23 and form a "four-point coplanar platform" in the test slot 23 to provide support for the Kelvin four-wire contact of the RC element 10. The lower end of the probe 3 extends longitudinally to the outside of the base 1 as a test contact.

[0029] The fixing seat 4 is a frame structure with a positioning cavity 42 that runs vertically through the center. The fixing seat 4 is fixed to the base 1 by bolts 11, and the support seat 2 is located inside the positioning cavity 42. The right end of the fixing seat 4 is also provided with a latch 41 for locking with the buckle 9.

[0030] Furthermore, the distance between the upper end of the probe 3 and the bottom wall of the test chamber 21 is less than the thickness of the RC element 10, so that after the RC element 10 is placed in the test slot 23 and simultaneously contacts the four probes 3, a portion of the upper end of the RC element 10 can protrude from the bottom wall of the test chamber 21, making it possible for the floating pressure plate 6 to contact the RC element 10. After the cover 5 is closed, the purpose of pressing the RC element 10 can be achieved.

[0031] The upper cover 5 includes an upper cover body 51, a rotating shaft 52, and a connecting shaft 8. The lower end of the upper cover body 51 is provided with a receiving groove 511, and the rotating shaft 52 is fixedly installed in the receiving groove 511. The top wall of the receiving groove 511 is also provided with a plurality of evenly distributed observation windows 512. The buckle 9 is rotatably provided at the right end of the upper cover body 51 and is used to form a reliable lock with the latch 41 on the fixing seat 4 to fix the upper cover 5 in a closed state. The left end of the upper cover body 51 is hinged to the fixing seat 4 through the connecting shaft 8.

[0032] The floating pressure plate 6 includes a pressure plate body 61 and a pressure block 62. The pressure block 62 is a columnar structure and is fixedly installed at the lower end of the pressure plate body 61. The pressure plate body 61 is movably suspended in the receiving groove 511 by a rotating shaft 52. The rotating shaft 52 is arranged in the front-back direction. At the same time, there is a specific gap between the upper end of the pressure plate body 61 and the top wall of the receiving groove 511, forming a "floating" structure. This structure allows the floating pressure plate 6 to perform adaptive rotation within a limited range in the receiving groove 511. When the upper cover 5 is closed on the fixed base 4, the pressure block 62 is inserted into the test chamber 21 as the upper cover 5 closes, adaptively adjusting its posture to avoid scratches and ensure uniform clamping force.

[0033] In this embodiment, the probe 3 is an elastic probe. After the cover 5 is closed, the pressure block 62 can contact the bottom wall of the test chamber 21. At this time, the RC element 10 is submerged in the test slot 23 to achieve a more stable clamping state. After the test is completed, the cover 5 is opened, the probe 3 releases its elastic potential energy, and the RC element 10 is ejected.

[0034] Working principle description: The ultra-miniature RC element 10 is placed on the platform consisting of four probes 3 in the test slot 23 of the support base 2; the upper cover 5 is rotated and closed onto the test base; during the closing process, the pressure block of the floating pressure plate 6 moves down and enters the test chamber 21, and the pressure block contacts the upper end face of the protruding RC element 10. The floating design of the floating pressure plate 6 allows it to make slight adaptive rotation during the pressing process, which effectively compensates for the slight deviation of the element placement or the mechanism itself, significantly improves the movement posture of the pressure block, ensures vertical and uniform force application, and minimizes the risk of scratches or stress on the electrodes or body of the ultra-miniature element; the buckle 9 is pressed down to lock it with the latch 41 of the fixed base 4, and the upper cover 5 is firmly locked in the closed position, ensuring that the RC element 10 is stably pressed on the probe 3 platform. Finally, the Kelvin four-wire method test can be performed through the four independent probes.

[0035] Through this technical solution, this fixture achieves safe, stable, and accurate Kelvin four-wire method testing of ultra-miniature RC components by means of a support base structure (test slot, fan-shaped through hole, mounting slot), an independent four-probe platform, a pressure plate system with a floating mechanism (pressure plate body gap + rotating shaft) and a reliable snap-locking mechanism. In addition, while ensuring the accuracy of electrical connection, this fixture also effectively protects the fragile ultra-miniature devices through the floating clamping mechanism.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A fixture for Kelvin four-wire testing of ultra-micro RC components, comprising a test seat, an upper cover (5) movably combined with the test seat, and a floating presser plate (6), characterized in that: The test fixture includes a base (1), a support base (2), and four probes (3). The support base (2) is fixed on the base (1). The top of the support base (2) is provided with a test cavity (21). The bottom wall of the test cavity (21) is provided with a test groove (23) and four longitudinal mounting grooves (25). The mounting grooves (25) are distributed at the four corners of the test groove (23) and partially overlap with the test groove (23). The four probes (3) are respectively located in the mounting grooves (25). The upper end of the probe (3) abuts against the top wall of the mounting groove (25) and extends into the test groove (23) to form a four-point coplanar support platform. The lower end of the probe (3) extends to the outside of the base (1). The depth of the test groove (23) is greater than the thickness of the RC element, and the distance between the upper end of the probe (3) and the bottom wall of the test cavity (21) is less than the thickness of the RC element. The floating pressure plate (6) is movably mounted on the upper cover (5) to cooperate with the probe (3) to press the RC element.

2. The fixture for Kelvin four-wire testing of ultra-micro RC components according to claim 1, wherein: The bottom wall of the test chamber (21) is provided with an annular heat dissipation groove (22) surrounding the test slot (23), and the heat dissipation groove (22) and the mounting slot (25) are interconnected to form a continuous heat dissipation channel.

3. The Kelvin four-wire test fixture for ultra-micro RC components of claim 2, wherein: The top wall of the mounting groove (25) is provided with a fan-shaped through hole (24), which is connected to the heat dissipation groove (22).

4. The Kelvin four-wire test fixture for ultra-micro RC components of claim 1, wherein: The floating pressure plate (6) includes a pressure plate body (61) and a columnar pressure block (62) located at the lower end of the pressure plate body (61). The pressure block (62) forms a pressing part and is set perpendicular to the test groove (23).

5. The Kelvin four-wire test fixture for ultra-micro RC components of claim 4, wherein: The lower part of the upper cover (5) has a receiving groove, and a rotating shaft (52) is provided in the receiving groove. The pressure plate body (61) is movably suspended in the receiving groove through the rotating shaft (52), and the pressure plate body (61) is located on the lower side of the top wall of the receiving groove.

6. The Kelvin four-wire test fixture for ultra-micro RC components of claim 1, wherein: The test seat also includes a frame-shaped fixing seat (4) fixed on the base (1). The fixing seat (4) has an open positioning cavity in the middle, and the support seat (2) is located in the positioning cavity. The right end of the fixing seat (4) has a latch. The left end of the upper cover (5) is hinged to the fixing seat (4). The right end of the upper cover (5) has a buckle that cooperates with the latch.

7. The tool for Kelvin four-wire testing of ultra-micro RC components according to claim 1, wherein: The test stand also includes several positioning pins (7) on the base (1), with the upper part of the positioning pins (7) sliding through the support base (2) and the lower part of the positioning pins (7) extending to the bottom of the base (1).

8. The tool for Kelvin four-wire testing of ultra-micro RC components according to claim 1, wherein: The mounting groove (25) is coaxial with the fan-shaped through hole (24).

9. The Kelvin four-wire test fixture for ultra-micro RC components of claim 6, wherein: The fixed seat (4) is fixed to the base (1) by bolts.

10. The fixture for Kelvin four-wire testing of ultra-micro RC components according to claim 5, wherein: The top wall of the receiving tank has multiple evenly distributed observation windows.

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