Circuit board stress adjusting device

Abstract

The utility model discloses a circuit board stress adjusting device, which relates to the related technical field of circuit boards, and comprises a lower shell and an upper cover, a circuit board is arranged between the lower shell and the upper cover, the circuit board is connected with a fastener, a stress relieving ring is arranged between the circuit board and the fastener, and the stress relieving ring is connected with the upper cover. The stress relieving ring comprises a steel sleeve and an elastic piece; the circuit board is supported through the steel ring, rigid contact of the circuit board is reduced, so that the circuit board is protected, meanwhile, the elastic piece on the steel ring can serve as a self-adjusting structure, automatic adjustment is achieved under the condition that the installation angle of the circuit board deviates, the stress problem occurring in the installation process of the circuit board is reduced, use is flexible, and the service life of the circuit board is prolonged. The device is not limited by the structure of the shell, the installation fixing point can be located in the middle of the circuit board or around the circuit board, the position is not limited, the problem of stress generated by multiple fixing points of a large circuit board is solved in a more targeted mode, and the device is easier to popularize and use.

Description

Technical Field

[0001] This utility model relates to the field of circuit board related technology, and in particular to a circuit board stress adjustment device. Background Technology

[0002] Flexible printed circuit boards (FPCs) used in computers, also known as flexible circuit boards or flexographic circuit boards, have advantages such as high wiring density, light weight, thinness, less wiring space constraints, and high flexibility. They perfectly align with the trend towards thinner and smaller electronic products, and are therefore widely used in PCs and peripherals, communication products, displays, and consumer electronics. However, because FPCs are inherently bendable, installation requires...

[0003] Without using any elastomer filler, the circuit board is directly fixed to the bottom support. Due to manufacturing reasons, the multiple support surfaces at the bottom are not on the same plane. After fixing, the circuit board will have certain vertical stress. When the circuit board is large, the distance between the bottom support points is far, and the height error of the fixing surface is even greater, which will make this stress more prominent.

[0004] Among them, a PCB circuit board with stress relief function with patent number CN206413255U is filled with an elastomer between the circuit board and the fixing point and is fastened with bolts. However, in actual use, the filling of the elastomer between the circuit board and the fixing point cannot guarantee the effective fastening of the bolts, because the elastomer will compress or rebound. When the bolt loses static torque, it will slowly come out, causing the circuit board to fail to be fixed. On the other hand, an instrument internal circuit board shock absorption and support structure with patent number CN219577482U avoids the stress generated by installation and vibration by using an elastomer. The mounting column passes through the elastomer and is directly connected to the pressure plate, avoiding the loosening of the fixation. It effectively solves the stress problem and the loosening problem in subsequent use. However: (1) The elastomer in the patent is only suitable for installation on a semi-open circuit board. When the circuit board is large and needs to be fixed in the middle, this structure cannot be used. (2) This structure must be used in conjunction with a pressure plate. At this time, the pressure plate, which is not usually needed, is added, which increases the cost and reduces the space utilization. Utility Model Content

[0005] Purpose of the invention: The purpose of this utility model is to provide a circuit board stress adjustment device to solve the problem of circuit board damage caused by excessive installation stress during the circuit board installation process.

[0006] Technical solution:

[0007] A circuit board stress adjustment device includes a lower housing and an upper cover, with a circuit board disposed between the lower housing and the upper cover. Fasteners are connected to the circuit board, and a stress relief ring is disposed between the circuit board and the fasteners. The stress relief ring includes a steel sleeve and an elastic element.

[0008] Preferably, the steel sleeve includes a middle section, both ends of which are fixedly connected to steel sleeve ends. The middle section passes through the circuit board, and the two steel sleeve ends are located on the upper and lower sides of the circuit board, respectively.

[0009] Preferably, the elastic element is sleeved in the middle of the steel sleeve, and the elastic element is located between the two ends of the steel sleeve.

[0010] Preferably, the steel sleeve has a through-hole extending vertically, the fastener is connected to the through-hole, and the fastener passes through the through-hole and is connected to the lower housing.

[0011] Preferably, the fastener includes a snap-fit ​​structure with a buckle at the end of the upper support column, a self-tapping screw, and a bolt and nut.

[0012] Preferably, the lower housing has an upward-opening receiving cavity, and the lower end of the steel sleeve abuts against the receiving cavity.

[0013] Preferably, an mounting platform is fixedly installed on the bottom wall of the accommodating cavity, and the steel sleeve abuts against the mounting platform.

[0014] Beneficial effects: By supporting the circuit board with a steel ring, the rigid contact of the circuit board itself is reduced, thereby protecting the circuit board. At the same time, the elastic element on the steel ring can act as a self-adjusting structure, automatically adjusting when the circuit board installation angle is offset, reducing stress problems during circuit board installation. It is flexible in use and not limited by the shell structure. The installation and fixing points can be in the middle or around the circuit board, with no location restrictions. It can more effectively solve the stress problem caused by multiple fixing points on large circuit boards, and is easier to promote and use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the fastener of this utility model;

[0017] Figure 3 This is a schematic diagram of the stress relief ring structure of this utility model.

[0018] Reference numerals: 11. Top cover; 12. Circuit board; 13. Fastener; 14. Elastic element; 141. Steel sleeve; 142. End of steel sleeve; 143. Inner hole; 144. Middle part of steel sleeve; 15. Lower housing; 151. Receiving cavity; 152. Connecting platform. Detailed Implementation

[0019] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] Example 1

[0023] like Figure 1 As shown, a circuit board stress adjustment device includes a lower housing 15 and an upper cover 11, with a space between the lower housing 15 and the upper cover 11. This application also includes a circuit board 12, which is located between the lower housing 15 and the upper cover 11, and the circuit board 12 and the lower housing 15 are detachably connected.

[0024] Among them, such as Figure 2 As shown, the circuit board 12 and the lower housing 15 are detachably connected by fasteners 13. The circuit board 12 is provided with stress relief rings, and the fasteners 13 pass through the stress relief rings to connect with the lower housing 15.

[0025] The circuit board 12 has several fixing points, which are through mounting holes, and each fixing point is equipped with a stress relief ring.

[0026] Stress relief rings Figure 3As shown, it includes a steel sleeve 141 and an elastic element 14. The steel sleeve 141 includes a steel sleeve middle portion 144, which passes through a mounting hole. Both the upper and lower ends of the steel sleeve middle portion 144 include steel sleeve ends 142. At least one end of the two steel sleeve ends 142 is rotated or riveted to the circuit board 12 after installation. The two steel sleeve ends 142 are located on the upper and lower sides of the circuit board 12, respectively, and the diameter of the steel sleeve ends 142 is larger than the diameter of the mounting hole to prevent the steel sleeve 141 and the circuit board 12 from separating.

[0027] Meanwhile, the elastic element 14 is fitted onto the middle part 144 of the steel sleeve. By designing the height of the middle part 144 of the steel sleeve and the thickness of the elastic element 14, the ability of the circuit board 12 to adjust stress is controlled. After installing the circuit board 12 with the stress relief ring, it can ensure that the circuit board has a certain buffer space to avoid installation stress, and also make the fasteners effectively tightened.

[0028] The preferred elastic element 14 is in the form of an annular washer, the material of which is compressible and resilient and can maintain a certain compressive elasticity for a long time. The thickness, hardness and resilience of the elastomer are determined according to the product requirements.

[0029] Furthermore, the elastic element 14 is located between the two steel sleeve ends 142, and the elastic element 14 is located on the upper and lower sides of the circuit board 12. The elastic element 14 can be arbitrarily set, but the elastic element 14 in all fixing points is located on the same side of the circuit board 12, so as to prevent the circuit board 12 from shifting due to the elastic element 25 during installation. During normal operation, when the flatness of the circuit board changes, the circuit board 12 will squeeze the elastic element 14 in turn, the elastic element 14 is compressed, the circuit board 12 recovers its deformation, and the installation stress is eliminated.

[0030] The steel sleeve 141 has an inner hole 143 that runs vertically through it. The fastener 13 passes through the inner hole 143 and is connected to the lower housing 15. Meanwhile, the lower housing 15 has an upward-opening accommodating cavity 151. When the circuit board 12 is connected to the lower housing 15, the circuit board 12 is located in the accommodating cavity 151.

[0031] Furthermore, the bottom of the accommodating cavity 151 is provided with several connecting platforms 152. The connecting platforms 152 are located below the fixing point. The fastener 13 passes through the steel sleeve 141 and connects with the connecting platform 152. The lower end of the steel sleeve 141 abuts against the connecting platform 152.

[0032] Among them, fastener 13 can be replaced by other means, such as a snap-fit ​​structure with a back buckle at the end of the upper support column, self-tapping screws, bolts and nuts, etc., which can effectively limit the vertical direction.

[0033] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A circuit board stress adjustment device, comprising a lower housing (15) and an upper cover (11), characterized in that: A circuit board (12) is provided between the lower housing (15) and the upper cover (11). Fasteners (13) are connected to the circuit board (12). A stress relief ring is provided between the circuit board (12) and the fasteners (13). The stress relief ring includes a steel sleeve (141) and an elastic element (14).

2. The stress adjustment device according to claim 1, characterized in that: The steel sleeve (141) includes a middle part (144) of the steel sleeve, and two ends of the steel sleeve (144) are fixedly connected to the ends of the steel sleeve (142). The middle part (144) of the steel sleeve passes through the circuit board (12), and the two ends of the steel sleeve (142) are located on the upper and lower sides of the circuit board (12) respectively.

3. The stress adjustment device according to claim 2, characterized in that: The elastic element (14) is sleeved in the middle (144) of the steel sleeve, and the elastic element (14) is located between the two ends (142) of the steel sleeve.

4. The stress adjustment device according to claim 2, characterized in that: The steel sleeve (141) has an inner hole (143) that runs vertically through it. The fastener (13) is connected to the inner hole (143). The fastener (13) passes through the inner hole (143) and is connected to the lower housing (15).

5. A stress adjustment device according to claim 2, characterized in that: The fastener (13) includes a snap-fit ​​structure with a buckle at the end of the upper support column, a self-tapping screw, and a bolt and nut.

6. The stress adjustment device according to claim 1, characterized in that: The lower housing (15) has an upward-opening accommodating cavity (151), and the lower end of the steel sleeve (141) abuts against the accommodating cavity (151).

7. A stress adjustment device according to claim 6, characterized in that: An installation platform (152) is fixedly installed on the bottom wall of the accommodating cavity (151), and the steel sleeve (141) and the installation platform (152) abut against each other.

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