A fisheye terminal

Abstract

This utility model relates to the field of electrical contact technology, and more particularly to a fisheye terminal. The fisheye terminal includes a base, a contact portion for interference fit with a via on a PCB, and a front guide portion for guiding the terminal into the via. A main slot is formed on the contact portion, penetrating the contact portion in the thickness direction and extending obliquely to the edge of the contact portion in the width direction. The opening of the main slot is located at the widest point of the contact portion to provide deformation when the widest point of the contact portion is squeezed by the via. When the fisheye terminal is inserted into the PCB, the widest point of the contact portion deforms towards the centerline of the fisheye due to the squeeze from the via. The main slot provides a certain amount of deformation, which reduces the insertion force of the fisheye terminal, allowing the widest dimension of the fisheye terminal to be smaller. A smaller insertion force and a larger holding force are achieved through a smaller interference fit, meeting the needs of miniaturization development of fisheye terminals and satisfying the requirements for high-speed impedance consistency.

Description

Technical Field

[0001] This utility model relates to the field of electrical contact technology, and in particular to a fisheye terminal. Background Technology

[0002] In modern data communication transmission systems, transmission rates are increasingly higher, and high-speed interconnect systems are widely used in communication networks and data exchange systems. High-speed backplane connectors, as the core bridge of data communication, face increasingly stringent performance requirements and are rapidly developing towards miniaturization, high density, and high speed. High-speed backplane connectors achieve coplanarity primarily through fisheye terminals crimped to the PCB. The PCB has vias, and the fisheye terminals are crimped into these vias to achieve the connection. Currently, to reduce the insertion force and increase the holding force of the fisheye terminals, hollow fisheye terminals are often used for crimping to the PCB, such as... Figure 1 As shown, the hollow fisheye terminal includes a base 1, a contact portion 2, and a front guide portion 3 connected sequentially from back to front. The front guide portion 3 guides the fisheye terminal into the via. The contact portion 2 is deformed by the via, thus providing contact retention force. To ensure that the retention force meets the requirements, the current hollow fisheye terminal has a large overall width and a large via diameter on the PCB, resulting in low via impedance. This fails to meet the impedance consistency requirements for high-speed 112G and above, leading to poor signal integrity. Utility Model Content

[0003] The purpose of this invention is to provide a fisheye terminal to solve the problem that the existing hollow fisheye terminals have a large width, resulting in low via impedance and failing to meet the impedance consistency requirements for high speed.

[0004] The present invention adopts the following technical solution:

[0005] A fisheye terminal includes a base, a contact portion for interference fit with a via of a PCB, and a front guide portion for guiding the terminal into the via. The contact portion has a main slot that penetrates the contact portion in the thickness direction and extends obliquely to the edge of the contact portion in the width direction. The opening of the main slot is located at the widest point of the contact portion to provide deformation when the contact portion is squeezed by the via at the widest point.

[0006] Furthermore, there are two main slots, which are spaced apart in the width direction of the contact portion.

[0007] Furthermore, the two main slots are arranged symmetrically about the center line of the contact area.

[0008] Furthermore, at least one set of auxiliary slots is provided on the contact portion. The auxiliary slots penetrate the contact portion in the thickness direction. The auxiliary slots are parallel to the main slots on the same side and the slot openings extend to the edge of the contact portion to provide more deformation when the contact portion is deformed under pressure.

[0009] Furthermore, each set of auxiliary slots includes two auxiliary slots, and the two auxiliary slots in the same set are arranged at intervals in the width direction of the contact portion.

[0010] Furthermore, the two auxiliary slots in the same group are arranged symmetrically about the center line of the contact area.

[0011] Furthermore, both the main slot and the auxiliary slot extend obliquely towards the base, and the angle α between them and the width direction of the contact portion is 30° < α < 90°.

[0012] Furthermore, each set of auxiliary slots is located on the side of the main slot facing the base.

[0013] Furthermore, both the main slot and the auxiliary slot extend obliquely toward the front guide portion, and the angle β between them and the length direction of the contact portion is 0° < β < 60°.

[0014] Furthermore, both the main slot and the auxiliary slot are straight slots.

[0015] Beneficial Effects: This utility model is a pioneering invention. The fisheye terminal is a solid terminal with a main slot formed on its contact portion. The main slot penetrates the contact portion in the thickness direction and extends obliquely to the edge of the contact portion in the width direction. The opening of the main slot is located at the widest point of the contact portion. When the fisheye terminal is inserted into the PCB, the widest point of the contact portion is deformed towards the center line of the fisheye by the via compression. The main slot provides a certain amount of deformation, which can reduce the insertion force of the fisheye terminal, allowing the widest dimension of the fisheye terminal to be smaller. A smaller insertion force and a larger holding force are achieved through a smaller interference fit, meeting the needs of the miniaturization development of fisheye terminals and the requirements of high-speed impedance consistency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an existing hollow fisheye terminal;

[0017] Figure 2 This is a schematic diagram of the structure of an embodiment of the fisheye terminal of this utility model;

[0018] Figure 3 for Figure 2 Side view of the fisheye terminal shown;

[0019] Figure 4 for Figure 2 Front view of the fisheye terminal shown;

[0020] Figure 5 for Figure 4 Sectional view at CC;

[0021] Figure 6 for Figure 4A schematic diagram of the partial structure after being cut at the CC section;

[0022] Figure 7 This is a schematic diagram of another embodiment of the fisheye terminal of this utility model;

[0023] In the diagram: 1. Base; 2. Contact part; 3. Front guide part; 4. Main slot; 5. Auxiliary slot. Detailed Implementation

[0024] Current hollow fisheye terminals have a relatively large overall width, resulting in low via impedance and failing to meet high-speed impedance consistency requirements. This invention provides a fisheye terminal with the following basic concept: the fisheye terminal is a solid terminal with a slotted structure on its contact portion for interference fit with the PCB. When the fisheye terminal is inserted into the PCB, the slotted structure provides a certain amount of deformation to accommodate the pressure deformation of the contact portion, reducing the insertion force and allowing for a smaller maximum width. This achieves a smaller insertion force and a larger holding force with a smaller interference fit, thus meeting high-speed impedance consistency requirements.

[0025] Based on the above inventive concept, the embodiments of the fisheye terminal of this utility model are described in detail below.

[0026] like Figure 2-6 As shown, the fisheye terminal of this utility model is a solid terminal, including a base 1, a contact portion 2, and a front guide portion 3 connected sequentially from back to front. The base 1 mainly serves a supporting function, the contact portion 2 is used for interference fit with the vias of the PCB, and the front guide portion 3 is used to guide the terminal into the via. The contact portion 2 has a rounded transition around its perimeter. Of course, in other embodiments, it can also be a multi-segment transition. Two sets of slots are spaced apart along the length of the contact portion 2, one set being a main slot 4 and the other a set being an auxiliary slot 5, with the auxiliary slot 5 parallel to the main slot 4 on its side. The main slot 4 and the auxiliary slot 5 penetrate the contact portion 2 in the thickness direction and extend obliquely to the edge of the contact portion 2 in the width direction. The opening of the main slot 4 is located at the widest point of the contact portion 2 to provide deformation when the contact portion 2 is squeezed by the via at its widest point. The auxiliary slot 5 can provide more deformation when the contact portion 2 is deformed under pressure.

[0027] Two main slots 4 are provided and spaced apart along the width of the contact portion 2. When the contact portion 2 is deformed under pressure, both main slots 4 on both sides can provide a certain amount of deformation, allowing both edges of the contact portion 2 to be squeezed and deformed towards the center in the width direction. The deformation on both sides of the contact portion 2 is more consistent, avoiding uneven deformation on one side and large differences in deformation on the other side, which could damage the vias on the PCB during interference fitting. At the same time, it can improve the reliability of the contact connection between the contact portion 2 and the vias after deformation under pressure. Preferably, the two main slots 4 are arranged symmetrically about the center line of the contact portion 2, which can further improve the consistency of deformation on both sides of the contact portion 2 in the width direction.

[0028] Similarly, the auxiliary slots 5 are arranged in pairs to form a set of auxiliary slots 5. The two auxiliary slots 5 in the same set are spaced apart in the width direction of the contact part 2, which can further increase the deformation on both sides of the contact part 2 and make the compressive deformation on both sides as consistent as possible. The two auxiliary slots 5 in the same set are symmetrically arranged about the center line of the contact part 2, which can further improve the consistency of compressive deformation on both sides of the contact part 2 in the width direction.

[0029] like Figure 2-4 As shown, when the terminal is inserted into the PCB via with an interference fit, the direction of the squeezing force is inclined towards the base 1. Therefore, both the main slot 4 and the auxiliary slot 5 extend inclinedly towards the base 1. The inclination direction of the slots is consistent with the deformation direction of the contact part 2 when it is deformed under pressure, thereby effectively reducing the terminal insertion force and increasing the terminal holding force. The terminal width direction is defined as the X-axis direction, the terminal length direction as the Y-axis direction, and the terminal thickness direction as the Z-axis direction. The angle α between each slot and the width direction of the contact part 2, i.e., the angle with the X-axis direction, is preferably 30° < α < 90°, such as 40°, 60°, 80°, etc. This angle range ensures that the contact part 2 deforms more easily when squeezed by the via, and reduces the terminal insertion force and increases the holding force to a certain extent through appropriate deformation, avoiding excessive deformation of the contact part 2 and excessive insertion force that could damage the PCB. The auxiliary slot 5 is located on the side of the main slot 4 facing the base 1, which can further reduce the terminal insertion force and increase the holding force after the terminal is inserted into the PCB.

[0030] Preferably, both the main slot 4 and the auxiliary slot 5 are straight slots. Straight slots have a simple structure, are easy to process, and facilitate the smooth deformation of the contact part 2 under pressure. Of course, the slots can also be other shapes, such as arc-shaped slots or bent slots with bends.

[0031] This utility model of fisheye terminal provides a certain amount of deformation for the contact part 2 under pressure deformation by setting a slotted structure on the contact part 2, which can reduce the insertion force when the fisheye terminal is inserted into the PCB by interference fit, so that the widest dimension of the fisheye terminal can be made smaller. It achieves a smaller insertion force and a larger holding force by a smaller interference fit, which meets the needs of the miniaturization development of fisheye terminal and meets the requirements of high speed impedance consistency.

[0032] Of course, this utility model is not limited to the embodiments described above.

[0033] For example, in the above embodiment, slots are provided on both sides of the contact portion in the width direction, and the slots on both sides are arranged symmetrically. In another embodiment, the slots on both sides of the contact portion, including main slots and auxiliary slots, may not be arranged symmetrically about the center line of the contact portion. For example, two slots in the same group may be staggered in the length direction of the contact portion. Alternatively, slots may be provided only on one side in the width direction of the contact portion. Or, auxiliary slots may be omitted, and only one set of main slots may be provided. Of course, two or more sets of auxiliary slots may be provided, with each set of auxiliary slots and main slots arranged at intervals in the length direction of the contact portion. The number and arrangement of slots are not strictly limited, as long as they can reduce the insertion force to a certain extent and meet the holding force requirements.

[0034] In addition, this utility model also provides another embodiment of the fisheye terminal, such as... Figure 7 As shown, the difference from the above embodiment lies in the different inclination direction of the slots. In this embodiment, both the main slot 4 and the auxiliary slot 5 extend obliquely toward the front guide portion 3, and the angle β between them and the length direction of the contact portion 2, i.e., the angle β between them and the Y-axis direction, is 0° < β < 60°, such as 15°, 30°, 45°, etc. This can also provide a certain amount of deformation for the contact portion under pressure deformation, thereby achieving a smaller insertion force and a larger holding force.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A fisheye terminal, characterized in that: It includes a base (1), a contact portion (2) for interference fit with a via of the PCB, and a front guide portion (3) for guiding the terminal to be inserted into the via. A main slot (4) is provided on the contact portion (2). The main slot (4) penetrates the contact portion (2) in the thickness direction and extends obliquely to the edge of the contact portion (2) in the width direction. The opening of the main slot (4) is located at the widest part of the contact portion (2) to provide deformation when the contact portion (2) is squeezed by the via at the widest part.

2. The fisheye terminal according to claim 1, characterized in that: Two main slots (4) are provided and are spaced apart in the width direction of the contact portion (2).

3. The fisheye terminal according to claim 2, characterized in that: The two main slots (4) are arranged symmetrically about the center line of the contact part (2).

4. The fisheye terminal according to any one of claims 1-3, characterized in that: At least one set of auxiliary slots (5) are also provided on the contact part (2). The auxiliary slots (5) penetrate the contact part (2) in the thickness direction. The auxiliary slots (5) are parallel to the main slots (4) on the same side and the slot openings extend to the edge of the contact part (2) to provide more deformation when the contact part (2) is deformed by pressure.

5. The fisheye terminal according to claim 4, characterized in that: Each set of auxiliary slots (5) includes two auxiliary slots (5), and the two auxiliary slots (5) in the same set are arranged at intervals in the width direction of the contact part (2).

6. The fisheye terminal according to claim 5, characterized in that: The two auxiliary slots (5) in the same group are arranged symmetrically about the center line of the contact part (2).

7. The fisheye terminal according to claim 4, characterized in that: Both the main slot (4) and the auxiliary slot (5) extend obliquely toward the base (1), and the angle α between them and the width direction of the contact part (2) is 30° < α < 90°.

8. The fisheye terminal according to claim 7, characterized in that: Each auxiliary slot (5) is located on the side of the main slot (4) facing the base (1).

9. The fisheye terminal according to claim 4, characterized in that: Both the main slot (4) and the auxiliary slot (5) extend obliquely toward the front guide part (3), and the angle β between them and the contact part (2) in the length direction is 0° < β < 60°.

10. The fisheye terminal according to claim 4, characterized in that: Both the main slot (4) and the auxiliary slot (5) are straight slots.

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