Board card slot design method, board card slot, circuit board and electronic equipment

Abstract

The invention discloses a board card slot design method, a board card slot, a circuit board and electronic equipment, and relates to the technical field of board card slots, the board card slot design method comprises the steps that a preliminary structure of the board card slot is determined according to the shape and size of a board card, the preliminary structure comprises a slot body, a plug terminal and an ear clip, the board card is used for being inserted into a preset position of the slot body, and the plug terminal is used for being inserted into the slot body; the plug-in terminals are connected with the plug-in terminals in the groove body; according to the distance between the position where the board card touches the plugging terminal for the first time and the preset position in the process that the board card is inserted into the groove body, the lifting height at which the hook body of the ear clip should be lifted when the board card is taken out from the preset position is determined; the size of the ear clip is obtained through optimization according to the lifting height, and after the ear clip is rotated, the board card is moved out of the groove body under the jacking action of the hook body of the ear clip. According to the board card slot design method, it can be ensured that the board card is stably taken out of the board card slot.

Description

Technical Field

[0001] The present application relates to the technical field of board card slots, and in particular to a board card slot design method, a board card slot, a circuit board, and an electronic device. Background Art

[0002] As an important electronic component in electronic equipment such as computers, boards are often installed and removed from board slots.

[0003] The slot of the board card slot is provided with plug-in terminals inside the slot body. After the board card is inserted into the slot body, it contacts the plug-in terminals to achieve electrical connection; rotatable ear buckles are provided at both ends of the slot body. When the board card needs to be removed from the board card slot, by rotating the ear buckles, the hook body at the bottom of the ear buckles applies a lifting force to the bottom of the board card, and the board card can be popped out of the board card slot, thereby achieving the removal of the board card.

[0004] Since boards are usually standard parts, their shapes and sizes are restricted by corresponding standards and cannot be adjusted at will. Therefore, the design of the board slot used in conjunction with the board is particularly important. However, in related technologies, the design of the board slot is poor, and the process of removing the board from the board slot is not smooth, resulting in the board being unable to be safely removed from the board slot, affecting the efficiency of removing the board, and the use effect needs to be improved.

[0005] Therefore, how to ensure that the board card is safely removed from the board card slot is a technical problem that those skilled in the art currently need to solve. Summary of the Invention

[0006] The purpose of this application is to provide a board card slot design method, a board card slot, a circuit board and an electronic device, which can ensure that the board card can be safely removed from the board card slot.

[0007] To achieve the above objectives, the present application provides a card slot design method, comprising:

[0008] Determine the preliminary structure of the card slot based on the shape and size of the card. The preliminary structure includes a slot body, plug-in terminals, and ear buckles. The card is inserted into a preset position of the slot body and connected to the plug-in terminals in the slot body.

[0009] The height to which the hook of the ear buckle should be lifted when the card is removed from the preset position is determined based on the distance between the position where the card first contacts the plug-in terminal during insertion into the slot and the preset position;

[0010] The size of the ear button is optimized according to the lifting height, so that after the ear button is rotated, the plate is moved out of the groove body under the lifting action of the hook body of the ear button.

[0011] In one aspect, the step of determining the height to which the hook of the ear clip should be lifted when the card is removed from the preset position based on the distance between the position where the card first contacts the plug-in terminal during insertion into the slot and the preset position includes:

[0012] Determine the movement distance P1 of the longest gold finger of the card during the insertion of the card into the slot, starting from the initial contact position between the longest gold finger of the card and the plug-in terminal until the longest gold finger is inserted into the preset position;

[0013] P is calculated according to the formula P= P1+Q-α, where P is the vertical distance between the position where the ear clip's hook should reach when the board needs to be taken out of the preset position and the preset position. The ear clip is in a vertical state at the initial position, and the tip of the ear clip's hook is against the bottom of the shortest gold finger of the board. Q is the height difference between the shortest gold finger and the longest gold finger, and α is the preset distance.

[0014] On the other hand, the step of optimizing the size of the ear clip according to the lift height includes:

[0015] Determine the angle θ that the ear clip should rotate from its initial position when the board is removed from the preset position;

[0016] Determine the vertical distance h between the hook tip and the bottom of the hook, and the vertical distance H between the center of the ear clip's rotation axis and the bottom of the hook, along the length of the ear clip.

[0017] Calculate the vertical distance G between the center of the ear clip's rotation axis and the tip of the hook in the length direction of the ear clip using the formula G=Hh;

[0018] Determine L using the formula (P-Q+h) / sinθ=L+(H / cosθ-G) / tanθ,

[0019] Among them, P is the vertical distance between the position that the hook of the ear buckle should reach when the board needs to be taken out of the preset position and the position of the hook body at the initial position. The initial position is the position of the ear buckle in a vertical state, and at the initial position, the tip of the hook body is against the bottom of the shortest gold finger of the board. Q is the height difference between the shortest gold finger and the longest gold finger. L is the vertical distance between the center of the ear buckle's rotating shaft and the tip of the hook body in the length direction of the slot.

[0020] On the other hand, the preset distance α is in the range of 0<α≤0.05 mm.

[0021] In another aspect, angle θ is acute.

[0022] On the other hand, before the step of determining the height to which the hook of the ear clip should be lifted when the card is removed from the preset position based on the distance between the position where the card first contacts the plug-in terminal during insertion into the slot and the preset position, the method further includes:

[0023] Based on the preliminary structure, determine the pulling force required to be applied to the board when removing it from the preset position;

[0024] Determine whether the pulling force value is less than or equal to the preset pulling force value. If so, execute the step of determining the lifting height of the ear buckle hook when the board is removed from the preset position based on the distance between the position where the board first touches the plug-in terminal during the insertion of the board into the slot and the preset position.

[0025] On the other hand, when it is determined that the pulling force value is greater than the preset pulling force value, before the step of determining the height to which the hook of the ear clip should be lifted when the card is removed from the preset position based on the distance between the position where the card first contacts the plug-in terminal during insertion into the slot and the preset position, the step further includes:

[0026] The position of the contact structure on the plug-in terminal for initial contact with the board is determined and / or the size of the contact structure on the plug-in terminal for initial contact with the board is determined so that the pulling force value is less than or equal to a preset pulling force value.

[0027] On the other hand, the preset pulling force value is 250N-300N.

[0028] On the other hand, when determining the position of the contact structure on the plug-in terminal for initial contact with the board, it includes:

[0029] S1311, adjusting the touch structure by a preset distance in a direction close to the preset position to obtain a touch position;

[0030] S1312, performing simulation analysis on the plug-in terminal according to the touch position to obtain a simulation result;

[0031] S1313. Determine whether the touch position is reasonable based on the simulation results. If it is reasonable, determine the touch position as the final position of the touch structure. If it is unreasonable, update the touch position based on the simulation results and execute S1312.

[0032] On the other hand, the simulation analysis includes: input loss simulation analysis, reflection loss simulation analysis and crosstalk simulation analysis.

[0033] On the other hand, when determining the size of the contact structure on the plug-in terminal for initial contact with the board, the size of the contact structure includes: the width of the contact structure and / or the distance between two oppositely arranged contact structures.

[0034] On the other hand, when the size of the contact structure includes the width of the contact structure, the step of determining the size of the contact structure on the plug-in terminal for initial contact with the board includes:

[0035] S1321, reducing the width of the touch structure to obtain a preliminary width;

[0036] S1322. Perform impedance simulation analysis on the plug-in terminal according to the preliminary width to obtain an impedance simulation result.

[0037] S1323: Determine whether the impedance simulation result is within a preset impedance range. If so, determine the preliminary width as the final width of the touch structure. If not, update the preliminary width according to the impedance simulation result and execute S1322.

[0038] On the other hand, when the size of the contact structure includes the distance between two contact structures arranged opposite to each other, the step of determining the size of the contact structure on the plug-in terminal for initial contact with the board includes:

[0039] S1331, increasing the distance between the two touching structures disposed opposite to each other to obtain a preliminary distance;

[0040] S1332. Perform a low-power contact impedance test on the plug-in terminal to obtain a low-power contact impedance test result;

[0041] S1333. Determine whether the low-power contact impedance test result is within the preset low-power contact impedance range. If so, determine the preliminary spacing as the final spacing; if not, update the preliminary spacing according to the low-power contact impedance test result and execute S1332.

[0042] On the other hand, the step of performing a low-power contact impedance test on the plug-in terminal to obtain the low-power contact impedance test result includes:

[0043] Apply DC voltage to the plug terminals, the DC voltage is less than or equal to 20mV;

[0044] Apply current to the plug terminals, the current is 0.1A;

[0045] The low-power contact impedance experimental results of the plug-in terminal were obtained through testing.

[0046] On the other hand, after the step of determining the size of the contact structure on the plug-in terminal for initial contact with the board, the method further includes:

[0047] The hook width c of the ear clip is calculated according to the formula c=d-2β, where d is the distance between the two relatively arranged touch structures, and β is the preset distance range.

[0048] On the other hand, the preset spacing range β is 0.08≤β≤0.12 mm.

[0049] The present application also provides a board card slot designed using the above-mentioned board card slot design method.

[0050] On the one hand, the board slot includes a slot body, a plug-in terminal and an ear clip. The plug-in terminal is arranged in the slot body. Ear clips are rotatably provided at both ends of the slot body. The bottom of the ear clip is provided with a hook body located in the slot body. The hook bodies of the two ear clips are arranged opposite to each other. By rotating the two ear clips, the two hooks respectively apply a lifting force to the bottom of both ends of the board card located in the slot body to pop the board card out of the slot body.

[0051] The present application also provides a circuit board, including a circuit board body, the circuit board body is provided with a board card slot, and the board card slot is the above-mentioned board card slot.

[0052] The present application also provides an electronic device, including a chassis and a circuit board arranged in the chassis, and the circuit board is the above-mentioned circuit board.

[0053] Compared with the above-mentioned background technology, the board card slot design method provided in this application first determines the preliminary structure of the board card slot according to the shape and size of the board card. The preliminary structure includes a slot body, plug-in terminals and ear buckles. The board card is used to be inserted into the preset position of the slot body and connected to the plug-in terminals in the slot body; the preset position here obviously refers to a certain position inside the slot body, and it can enable the board card to reach it. It can be considered that when the board card reaches the preset position, the board card and the slot body should be plugged into place, that is, whether the board card and the slot body are physically connected or electrically connected, they should be kept fixed in a relative position.

[0054] Then, based on the distance between the position where the board and the plug-in terminal first touch each other during the process of inserting the board into the slot and the preset position, the lifting height to which the hook of the ear button should be lifted when the board and the card is removed from the preset position is determined; that is, taking the position when the board and the plug-in terminal first touch each other as the starting point, and the preset position as the end point, the distance between the starting point and the end point is obtained, and based on the distance, the lifting height to which the hook of the ear button should be lifted when the board and the card need to be removed from the preset position is determined; here, since the lifting height to which the hook of the ear button should be lifted will directly determine the height to which the board and the card bounce when it is removed from the preset position, it is necessary to determine the position to which the board and the card should reach under the action of the hook of the ear button when it is removed from the preset position. This position is obviously related to the position where the board and the plug-in terminal first touch each other, that is, the position to which the board and the card should reach can be slightly lower than the position where the board and the plug-in terminal first touch each other. It can be seen that the lifting height to which the hook of the ear button should be lifted can be determined based on the position where the board and the plug-in terminal first touch each other.

[0055] Finally, the size of the ear buckle is optimized according to the lifting height, so that after the ear buckle is rotated, the plate is moved out of the groove body under the lifting action of the hook body of the ear buckle.

[0056] The above-mentioned board card slot design method utilizes the distance between the position when the board card and the plug-in terminal first touch each other during the process of inserting the board card into the slot body and the preset position in the slot body to obtain the actual distance that the board card needs to move downward when it first touches the plug-in terminal. In other words, from the time the board card first touches the plug-in terminal until the board card is plugged into place, the distance that the board card should move during this process can be regarded as the basis for the height that the board card should bounce up when it pops out. Therefore, the lifting height that the hook body of the ear buckle should lift can be determined by the distance between the position when the board card and the plug-in terminal first touch each other and the preset position, and the size of the ear buckle is optimized according to the above-mentioned lifting height, so that after the ear buckle is rotated, the board card is moved out of the slot body under the lifting action of the hook body of the ear buckle.

[0057] It can be seen that the lifting height to which the hook body should be lifted is determined based on the distance between the position when the board and the plug-in terminal first touch each other and the preset position. The ear buckle size obtained thereby, after the hook body is lifted upward according to the lifting height, the board can be moved upward to near the position when it first touches the plug-in terminal under the lifting force of the hook body, thereby effectively ensuring that the board is removed from the slot body, thereby avoiding the situation where most of the board has not yet been separated from the slot body due to the lifting height of the hook body being too low, and avoiding the situation where the board flies out of the slot body due to the lifting height of the hook body being too high, causing the board to fall, thereby achieving controllable height of the board bouncing out of the slot body, and effectively ensuring that the board is smoothly and reliably removed from the slot body.

[0058] The present application also provides a board card slot designed according to the above-mentioned board card slot design method. The beneficial effects of the board card slot can refer to the beneficial effects of the above-mentioned board card slot design method and will not be elaborated here.

[0059] The present application also provides a circuit board including the above-mentioned board card slot and an electronic device including the circuit board. The beneficial effects thereof can be seen above and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0061] Figure 1 A flowchart of a first specific implementation of the board card slot design method provided in an embodiment of the present application;

[0062] Figure 2 Schematic diagram of the ear clip in its initial position and its rotational position after the board is removed;

[0063] Figure 3 This is a schematic diagram of the board and the plug-in terminal when it first comes into contact;

[0064] Figure 4 for Figure 1 Flowchart of a specific implementation of S2;

[0065] Figure 5 It is a structural diagram of the board;

[0066] Figure 6 for Figure 5 Detailed picture of the gold finger part;

[0067] Figure 7 for Figure 1 Flowchart of a specific implementation of S3;

[0068] Figure 8 Based on Figure 7 Dimensioning diagram for calculating ear stud size;

[0069] Figure 9 To calculate Figure 7 Schematic diagram of the auxiliary lines required when the vertical distance L is in the middle;

[0070] Figure 10 A flowchart of a second specific implementation of the board slot design method provided in an embodiment of the present application;

[0071] Figure 11 This is a flowchart of a third specific implementation of the board card slot design method provided in an embodiment of the present application;

[0072] Figure 12 for Figure 11 A flowchart of a specific implementation of S13;

[0073] Figure 13 This is a structural comparison diagram of the contact structure of the plug terminal before and after the position change;

[0074] Figure 14 Based on Figure 13 Comparison chart of the analysis results of input loss simulation analysis of the structure;

[0075] Figure 15 Based on Figure 13 Comparison chart of analysis results of reflection loss simulation analysis for the structure;

[0076] Figure 16 Based on Figure 13The comparison chart of the analysis results of crosstalk simulation analysis on the structure;

[0077] Figure 17 for Figure 11 Flowchart of another specific implementation of S13;

[0078] Figure 18 This is a structural comparison diagram of the contact structure of the plug terminal before and after the width is changed;

[0079] Figure 19 for Figure 11 A flowchart of another specific implementation of S13;

[0080] Figure 20 A structural comparison diagram of the distance between two relatively arranged touch structures before and after the change;

[0081] Figure 21 Based on Figure 20 Comparison of experimental results of low power contact impedance test on the structure;

[0082] Figure 22 This is a flowchart of a fourth specific implementation of the board card slot design method provided in an embodiment of the present application;

[0083] Figure 23 A schematic diagram showing the width of the ear clip hook and the distance between two oppositely arranged contact structures;

[0084] in,

[0085] 100-ear buckle, 110-rotating shaft, 120-hook body;

[0086] 200-board slot, 210-slot body, 220-plug terminal, 221-touch structure;

[0087] 300-board, 310-card body, 320-gold finger. DETAILED DESCRIPTION

[0088] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0089] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0090] At present, in order to remove the board and card from the board and card slot, an ear button is provided at the end of the board and card slot. By rotating the ear button, the hook at the bottom of the ear button applies an upward lifting force to the bottom of the board and card. The method of driving the ear button to rotate can be: applying a force away from the board and card to the top of the ear button to rotate the ear button as a whole. The top of the ear button rotates in the direction away from the board and card, and the hook at the bottom of the ear button can apply a lifting force on the board and card from the bottom to the top.

[0091] The board referred to in this article may be a memory stick, and accordingly, the board slot should be a memory slot. Of course, the board may also be a card body of other forms, and the board may be a card body with electronic components or a card body without electronic components.

[0092] In related art, when a hook applies a lifting force to a card, the card pops out of the card slot. Sometimes, the hook is lifted too high, causing the card to fly out of the card slot. That is, the card pops out from a high height, causing the card to accidentally fall after leaving the card slot. The falling card can then collide with or scrape against other components, causing damage to the card or other components, thereby affecting subsequent use. Therefore, the card slot design method provided in this application can at least partially solve the above technical problems.

[0093] Please see the attached Figure 1 The present application provides a card slot design method, one of the core aspects of which is to ensure that the card can be safely removed from the card slot by optimizing the size of the ear clip. The card slot design method includes:

[0094] Step S1: Determine the preliminary structure of the card slot based on the shape and size of the card. The preliminary structure includes a slot body, plug-in terminals, and ear buckles. The card is inserted into a preset position of the slot body and connected to the plug-in terminals in the slot body.

[0095] In step S1, it is necessary to determine the preliminary structure of the board slot. The preliminary structure includes a slot body, plug-in terminals and ear buckles. The basis for determining the preliminary structure is the shape and size of the board. The slot body is a component for plugging and unplugging the board, and its size and shape should depend on the size and shape of the board. The board can be inserted into the preset position of the slot body and connected to the plug-in terminals in the slot body.

[0096] The preset position can be considered as the position where the board is plugged into place relative to the slot body. For example, the preset position can specifically be the bottom inner side of the slot body, that is, when the board is extended downward into the slot body and moves to the bottom of the slot body, the board can no longer move downward relative to the slot body. At this time, the board and the slot body are plugged into place. Of course, the preset position can also be any position near the bottom of the slot body, which will not be elaborated in this article.

[0097] Please see the attached Figure 2Regarding the preliminary structure of the board card slot, the preliminary structure includes an ear button 100 and a board card slot 200. A rotating shaft 110 is set at an appropriate position of the ear button 100. The rotating shaft 110 can be set at the end of the board card slot 200. It can be regarded as the ear button 100 being rotatably set in the board card slot 200. The ear button 100 can rotate relative to the board card slot 200 under the action of the rotating shaft 110.

[0098] Attachment Figure 2 Two different states of the ear stud 100 are shown. Figure A is a schematic diagram of the ear stud 100 in the initial position, and Figure B is a schematic diagram of the ear stud 100 after rotation.

[0099] When the ear clip 100 is in the initial position A, the ear clip 100 is in a vertical position. Figure 2 The ear button 100 is located in the slot of the card slot 200. When the card needs to be taken out of the slot of the card slot 200, the ear button 100 needs to be rotated clockwise around the shaft 110, that is, the top of the ear button 100 faces the Figure 2 The right side is rotated downward, and the hook body 120 at the bottom of the ear button 100 is turned to Figure 2 The left upper part rotates, that is, the hook body 120 moves upward, thereby ejecting the card in the card slot 200. The ear buckle 100 after rotation is Figure 2 The location of B in the middle.

[0100] In step S2, the lifting height of the hook of the ear clip when the card is removed from the preset position is determined based on the distance between the position where the card first contacts the plug-in terminal during insertion into the slot and the preset position;

[0101] Please see the attached Figure 3 , attached Figure 3 The cross-sectional structure of the card slot 200 is shown in FIG. The card slot 200 includes a slot body 210 for inserting and removing the card 300. The slot body 210 is provided with plug terminals 220 on both sides of the interior of the slot body 210. Figure 3 Only one set of oppositely arranged plug terminals 220 is shown.

[0102] When the board 300 is inserted into the slot 210 of the board slot 200 from top to bottom, the bottom of the board 300 will contact the plug-in terminal 220 inside the slot 210, and there is an initial contact position between the board 300 and the plug-in terminal 220, as shown in the attached figure. Figure 3 shown.

[0103] Attachment Figure 3 The position M is the initial contact position between the board 300 and the plug-in terminal 220, and the initial contact position should be higher than the above-mentioned preset position, that is, when the board 300 is inserted into the slot 210, it first passes through the position M before reaching the preset position.

[0104] It can be known that the initial contact position (attached Figure 3 The position M) varies according to the shape and size of the plug-in terminal 220 and the shape and size of the board 300. The initial contact position may be high or low, but in any case, as long as the shape and size of the board slot 200 and the board 300 match, there must be an initial contact position.

[0105] Furthermore, when the board 300 is inserted into the slot 210, once the board 300 reaches position M, as the board 300 continues to move downward, the board 300 will continue to maintain contact with the plug-in terminal 220. In other words, the board 300 reaches the initial contact position (see FIG. Figure 3 During the process from the position M in the middle to the preset position, the board 300 will continue to contact the plug terminal 220.

[0106] What needs to be known in step S2 is that the board 300 and the plug-in terminal 220 are in initial contact (attached Figure 3 Starting from the position M in the figure, as the board 300 continues to move downward, until the board 300 moves to the preset position of the slot 210, the moving distance of the board 300 in this process is the scratching stroke.

[0107] After obtaining the above-mentioned moving distance, the lifting height to which the hook body of the ear clip should be lifted when the board 300 is taken out from the preset position is determined based on the moving distance.

[0108] Please continue to see the attached Figure 2 , attached Figure 2 The position M in the Figure 3 The initial contact position between the middle board card 300 and the plug-in terminal 220. When the board card needs to be taken out of the slot, the pop-up height of the board card relative to the slot depends on the height to which the hook body 120 of the ear buckle 100 is lifted. In this article, the lifting height of the hook body 120 is based on position M.

[0109] This article uses position M (the initial contact position between the board and the plug-in terminal) as a reference point to determine the lifting position of the hook body 120, that is, the lifting height of the hook body 120 is determined using the above-mentioned scratching stroke.

[0110] Considering that the board and the plug-in terminal are often not well supported by the plug-in terminal at the initial contact position, it is very likely that the board will tilt or even fall, thus affecting the use. In view of this, it is best to define the lifting position of the hook body 120 to be below the position M (the initial contact position of the board and the plug-in terminal), that is, Figure 2 The middle position N is to ensure that the plug-in terminal can exert a certain clamping force on the board to prevent the board from tilting or falling.

[0111] With such arrangement, the board moves upward under the lifting action of the hook body 120, and the bottom of the board moves to position N, which is just the position where the board can be reliably clamped and supported by the plug-in terminals, and most of the board can also extend out of the slot body. This can avoid the situation where most of the board has not yet been separated from the slot body due to the hook body 120 being lifted too low, and can also avoid the situation where the board flies out of the slot body due to the hook body 120 being lifted too high, causing the board to fall. This makes it possible to control the height of the board bouncing out of the slot body, effectively ensuring that the board can be removed from the slot body smoothly and reliably.

[0112] Here, the distance between position M and position N can be determined according to actual needs, as long as it can ensure that most of the position of the board is separated from the slot and the board will not fall from the slot. A specific implementation method will be given later.

[0113] Of course, according to the actual situation, Figure 2 The height relationship between the middle position N and the position M (the initial contact position between the board and the plug-in terminal) is not limited to the above description. For example, the plug-in terminal is located relatively low in the slot, that is, after the board is completely separated from the plug-in terminal, most of the board can still be located in the slot. In this case, the position N can be set higher, that is, the lifting height of the hook body 120 can be higher.

[0114] Step S3: Optimize the size of the ear button according to the height to which the hook of the ear button should be lifted, so that after the ear button is rotated, the plate is moved out of the slot under the lifting action of the hook of the ear button.

[0115] Please continue to see the attached Figure 2 Once the position N is determined, that is, the height to which the hook body 120 of the ear clip 100 should be lifted, the dimensions of the ear clip 100 can be optimized. For example, the position of the rotating shaft 110 and the dimensions of the hook body 120 can be optimized. This process can obviously optimize any part of the ear clip 100 according to actual needs, so that after the ear clip 100 rotates, the card can be smoothly and reliably removed from the slot under the lifting action of the hook body 120. In other words, when the card needs to be removed from the slot of the card slot 200, the rotation of the ear clip 100 can just lift the card a certain distance that will not cause the card to fly out of the slot of the card slot 200, and will not cause the majority of the card to remain inserted in the slot.

[0116] It can be seen that by optimizing the lifting height of the ear buckle hook, the size of the ear buckle 100 is more reasonable, and the height at which the board card bounces out of the slot body of the board card slot 200 is controllable, effectively ensuring that the board card can be removed from the slot body smoothly and reliably.

[0117] In some embodiments, see the attached Figure 4 The above step S2 determines the height to which the hook of the ear clip should be lifted when the card is removed from the preset position based on the distance between the position where the card first contacts the plug-in terminal during the insertion process of the card into the slot and the preset position, including:

[0118] Determine the movement distance P1 of the longest gold finger of the card during the insertion of the card into the slot, starting from the initial contact position between the longest gold finger of the card and the plug-in terminal until the longest gold finger is inserted into the preset position;

[0119] P is calculated according to the formula P=P1+Q-α, where P is the vertical distance between the position where the ear clip's hook should reach when the board needs to be taken out of the preset position and the preset position. The ear clip is in a vertical state at the initial position, and the tip of the ear clip's hook is against the bottom of the shortest gold finger of the board. Q is the height difference between the shortest gold finger and the longest gold finger, and α is the preset distance.

[0120] Please refer to the attached Figure 5 and attached Figure 6 , attached Figure 5 The board 300 is a certain type of memory card. Figure 6 Shown attached Figure 5 A magnified view of the partial location of the memory card.

[0121] As attached Figure 5 The memory card 300 includes a card body 310 and gold fingers 320 located at the bottom of the card body 310. The gold fingers 320 at different positions have different lengths. The gold fingers 320 located at the middle position I are longer, while the gold fingers 320 located at positions II on both sides are shorter. The gold fingers 320 located at the middle position I are the longest gold fingers, and the gold fingers 320 located at positions II on both sides are the shortest gold fingers. The top surfaces of all the gold fingers 320 are flush, so the bottom surfaces of the gold fingers 320 are not flush.

[0122] Since the plug-in terminals inside the slot are arranged at the same height and the top surfaces of all the gold fingers 320 are flush, when the memory card 300 is inserted into the slot, the longest gold finger will first come into contact with the plug-in terminal. Figure 3 Position M in.

[0123] Here, the longest gold finger is used as a reference object, starting from the first contact of the longest gold finger with the plug terminal until the longest gold finger is inserted into the preset position. The movement distance of the longest gold finger is P1.

[0124] Here we take the shortest gold finger as a reference. When the shortest gold finger and the plug-in terminal first come into contact, the bottom of the longest gold finger is lower than the bottom of the shortest gold finger. Therefore, the longest gold finger has already made initial contact with the plug-in terminal and moved downward a certain distance (the distance is the difference between the longest gold finger and the shortest gold finger). As the board continues to move downward, the longest gold finger and the shortest gold finger eventually reach their respective preset positions synchronously.

[0125] From the perspective of the shortest gold finger, starting from the first contact of the shortest gold finger with the plug terminal until the shortest gold finger is inserted into the preset position, the movement distance of the shortest gold finger is P2, where P1 is greater than P2, and the difference between P1 and P2 is the difference between the longest gold finger and the shortest gold finger.

[0126] It can be seen that although the timing of contact between different gold fingers 320 and the plug-in terminal is different, the position (height) of the initial contact with the plug-in terminal is consistent. Therefore, starting from their respective initial contact positions until they reach their respective preset positions, the scratching travel experienced by different gold fingers 320 is different.

[0127] In other words, after the longest gold finger first contacts the plug terminal and continues to move to the preset position, the longest gold finger moves the longest distance, while after the shortest gold finger first contacts the plug terminal and continues to move to the preset position, the shortest gold finger moves the shortest distance; it can be seen that for gold fingers 320 of different lengths, their corresponding preset positions should also be different.

[0128] Based on this, it should also be pointed out that the preset position mentioned above should be defined differently for the case where the board has gold fingers of different lengths. That is, for longer gold fingers, the preset position should be at a lower position of the slot, and for shorter gold fingers, the preset position should be at a higher position of the slot, so as to ensure that gold fingers of different lengths finally reach different heights.

[0129] In summary, for different gold fingers, the moving distance P1 of the longest gold finger is the longest from the initial contact with the plug terminal to the movement to the preset position. Therefore, the moving distance P1 is used as a reference to determine the lifting height of the hook body.

[0130] Formula P = P1 + Q-α is used to calculate P, where P is the vertical distance between the position where the ear clip's hook should reach when the card needs to be removed from the preset position and the preset position. The ear clip is in a vertical state at the initial position, and the tip of the ear clip's hook is against the bottom of the shortest gold finger of the card. Q is the height difference between the shortest gold finger and the longest gold finger, and α is the preset distance. Figure 7The Q shown in the figure is the height difference between the shortest gold finger and the longest gold finger of the board. The height difference Q is usually 0.5mm.

[0131] When the ear clip is in the initial position, the tip of the hook is higher than the bottom of the longest gold finger, that is, the tip of the hook is higher than the preset position, and the preset position here is the bottom position of the longest gold finger.

[0132] This article uses the preset position as a benchmark when calculating the height to which the ear clip's hook should be lifted. That is, the height to which the ear clip's hook should be lifted when the board is removed from the preset position (that is, the vertical distance P between the position the hook should reach and the preset position) is calculated by adding the height difference Q between the shortest gold finger and the longest gold finger of the board to the above-mentioned moving distance P1.

[0133] In fact, the height difference Q between the shortest gold finger and the longest gold finger of the board is the height of the hook tip of the hook body when the ear button is in the initial position. In order to move the longest gold finger upward from the preset position to the position when it first touches the plug-in terminal, the hook tip of the hook body should move upward, and the distance of the upward movement is the above-mentioned moving distance P1. In addition to the above-mentioned moving distance P1, the hook tip of the hook body should also add the height of the hook tip when the ear button is in the initial position (that is, the height difference Q).

[0134] In addition, in the above formula P=P1+Q-α, after adding the height difference Q to the moving distance P1, the preset distance α needs to be subtracted. This can prevent the board from moving upward to the position where it first touches the plug-in terminal when it is removed from the slot. If the board moves upward to the position where it first touches the plug-in terminal, the board may not be effectively supported by the plug-in terminal and fall from the slot. That is, the position where the board moves upward should be lower than the position where the board and the plug-in terminal first touch. This can ensure that the board bounces up from the slot to an appropriate height, which not only ensures the separation of the board and the slot, but also prevents the board from flying out of the slot, thereby ensuring that the board can be safely removed from the slot.

[0135] The range of the above-mentioned preset distance α can be set to 0<α≤0.05mm, that is, the position to which the board moves upward is less than 0.05mm lower than the position when the board and the plug-in terminal first touch. This not only enables the board and the slot to be disengaged in place, but also ensures that the plug-in terminal effectively supports the bottom of the board, preventing the board from being separated from the contact with the plug-in terminal, causing the board to fall from the slot, etc.

[0136] In some embodiments, see the attached Figure 7 The above step S3 of optimizing the size of the ear stud according to the lifting height includes:

[0137] S31, determining the angle θ that the ear button should rotate from the initial position when the board is taken out from the preset position;

[0138] S32. Determine the vertical distance h between the hook tip and the bottom of the hook, and the vertical distance H between the center of the rotating shaft of the ear clip and the bottom of the hook, along the length direction of the ear clip.

[0139] S33. Calculate the vertical distance G between the center of the ear clip's rotation axis and the tip of the hook in the length direction of the ear clip according to the formula G=Hh;

[0140] S34. Determine L according to the formula (P-Q+h) / sinθ=L+(H / cosθ-G) / tanθ.

[0141] Among them, P is the vertical distance between the position that the hook of the ear buckle should reach when the board needs to be taken out of the preset position and the position of the hook body at the initial position. The initial position is the position of the ear buckle in a vertical state, and at the initial position, the tip of the hook body is against the bottom of the shortest gold finger of the board. L is the vertical distance between the center of the ear buckle's rotating shaft and the tip of the hook body in the length direction of the slot.

[0142] Please see the attached Figure 9 In step S31, the angle θ is the angle between position A and position B. At position A, the ear clip 100 is in the initial position, and the ear clip 100 is in a vertical state. When the ear clip 100 rotates around the rotating shaft 110 to position B, the hook body 120 should be able to lift the board to a position where the board can be moved out. The angle θ should be an acute angle, preferably 30°.

[0143] In step S32, the specific position of the shaft 110 in the ear button 100 can be determined according to the shape and size of the board slot 200, that is, the vertical distance H between the bottom of the hook body 120 and the center O of the shaft 110 can be determined, and based on the condition that the hook tip of the hook body 120 is against the bottom of the shortest gold finger of the board when the ear button 100 is in the initial position, the vertical distance h between the hook tip of the hook body 120 and the bottom of the hook body 120 can be determined. In this way, the position of the ear button 100 relative to the shaft 110 can be roughly determined.

[0144] In step S33, the vertical distance G between the center of the rotating shaft of the ear clip and the tip of the hook body in the length direction of the ear clip is calculated according to the formula G=Hh. Obviously, under the premise that the vertical distance H and the vertical distance h are determined, the vertical distance G can be obtained by the attached Figure 9 Obviously,

[0145] In step S34, L is determined according to the formula (P-Q+h) / sinθ=L+(H / cosθ-G) / tanθ, and the Figure 9It can be seen that, first, it is observed that the right triangle with the vertical distance H as a right angle, the vertical distance G plus the vertical distance h, plus the distance V as the hypotenuse has an angle θ, so the distance V can be calculated; in another right triangle, the distance V plus the vertical distance h is a right angle, and the distance U is another right angle, and they also have an angle θ, so the distance U can be calculated; in the right triangle, the distance U plus the vertical distance L is the hypotenuse, and the distance P-Q+h is a right angle, and they also have an angle θ, so the vertical distance L can be calculated, that is, the vertical distance between the center of the rotation axis O of the ear buckle 100 and the tip of the hook body 120 in the length direction of the groove body.

[0146] In some embodiments, see the attached Figure 10 Before determining the height to which the hook of the ear clip should be lifted when the card is removed from the preset position based on the distance between the position where the card first contacts the plug-in terminal during insertion of the card into the slot and the preset position, the step S2 further includes:

[0147] Step S11: Based on the preliminary structure, determine the pulling force required to be applied to the board when the board is removed from the preset position;

[0148] Step S12, determine whether the pulling force value is less than or equal to the preset pulling force value. If so, execute step S2, that is, the step of determining the lifting height of the ear buckle hook when the board is removed from the preset position based on the distance between the position where the board first touches the plug-in terminal during the insertion of the board into the slot and the preset position.

[0149] It can be seen that before optimizing and determining the hook body of the ear buckle, it is also possible to first consider whether the size of the pulling force that needs to be applied to the board when the board is removed from the preset position is appropriate, that is, to determine whether the pulling force that needs to be applied to the board when the board is removed from the preset position is less than or equal to the preset pulling force. If the pulling force is less than or equal to the preset pulling force, it indicates that the board is removed smoothly and the clamping force applied to the board is appropriate, that is, the size of the local position of the board slot in contact with the board is reasonable, and the board pop-up height can continue to be adjusted; if the pulling force is greater than the preset pulling force, it indicates that the board is difficult to remove and the clamping force applied to the board is large, that is, the size of the local position of the board slot in contact with the board needs to be adjusted, and there is no need to adjust the board pop-up height for the time being.

[0150] With this setting, before adjusting the height of the board pop-up, it is first determined whether the contact position between the board slot and the board is set reasonably. Only when the contact position between the board slot and the board is set reasonably, will the ear button size adjustment process be performed, that is, the height of the board pop-up is adjusted.

[0151] In some embodiments, see the attached Figure 11 Step S12 is then executed to determine whether the pulling force is less than or equal to a preset pulling force value. If not, i.e., if the pulling force is greater than the preset pulling force value, step S13 is executed to determine the position and / or size of the contact structure on the plug-in terminal for initial contact with the board and card, so that the pulling force is less than or equal to the preset pulling force value. After step S13, step S2 is executed again. The preset pulling force value can be set to 250N-300N.

[0152] It can be seen that in order to ensure that the pulling force applied to the board when the board is removed from the preset position is less than or equal to the preset pulling force, it is necessary to adjust the position of contact with the board; please refer to the attached Figure 2 Two rows of plug-in terminals 220 are provided inside the slot body 210. The two rows of plug-in terminals 220 are arranged opposite to each other, and there is a certain distance between the two rows of plug-in terminals 220. This distance is used for the gold fingers of the board 300 to extend therein. Taking one group of oppositely arranged plug-in terminals 220 as an example, a group of oppositely arranged plug-in terminals 220 consists of two terminals, and both of the two plug-in terminals 220 are provided with a bending structure facing each other in the length direction. The bending structure is a touch structure for contacting the gold fingers. That is, the distance between the two oppositely arranged plug-in terminals 220 is the smallest at the position of the touch structure. When the gold fingers of the board 300 are inserted into the interior of the slot body 210, the gold fingers and the touch structure come into contact. As the board 300 continues to move downward, the touch structure and the gold fingers slide relative to each other until the bottom of the board 300 moves to the preset position. Starting from the initial contact between the gold fingers and the touch structure, the touch structure will always be in contact with the gold fingers until the board 300 moves to the preset position.

[0153] Based on this, in order to reduce the pulling force required to remove the card from the preset position, the position and / or size of the touch structure need to be adjusted to reduce the clamping force of the touch structure (bending structure) on the card 300, so that the pulling force is less than or equal to the preset pulling force. Of course, the position of the touch structure can be adjusted separately, the size of the touch structure can be adjusted separately, or both can be adjusted simultaneously, depending on the specific situation.

[0154] In some embodiments, see Appendix Figure 12 The step of adjusting the position of the touch structure includes:

[0155] S1311, adjusting the touch structure by a preset distance in a direction close to the preset position to obtain a touch position;

[0156] S1312, performing simulation analysis on the plug-in terminal according to the touch position to obtain a simulation result;

[0157] S1313. Determine whether the touch position is reasonable based on the simulation results. If it is reasonable, execute step S1314 to determine the touch position as the final position of the touch structure. If it is unreasonable, execute step S1315 to update the touch position based on the simulation results and execute S1312.

[0158] In step S1311, the touch structure is adjusted by a predetermined distance in a direction closer to the predetermined position to obtain the touch position. In other words, the touch structure is moved closer to the predetermined position. This reduces the distance of friction between the gold finger and the touch structure. The gold finger does not need to rub against the touch structure over a long distance, which helps reduce the tensile force caused by prolonged mutual friction. In other words, the friction distance between the gold finger and the touch structure is reduced, which helps reduce the tensile force. The predetermined distance that the touch structure needs to be adjusted can be determined according to actual needs. For example, the position of the touch structure can be adjusted in millimeters.

[0159] Please see the attached Figure 13 , which shows a cross-sectional view of the slot body 210. It can be seen that the position of the touch structure 221 moves downward, that is, moves closer to the preset setting position. Before adjustment, the distance between the touch structure 221 and the bottom of the slot body 210 is 2.05 mm. After adjustment, the distance between the touch structure 221 and the bottom of the slot body 210 is 1.90 mm.

[0160] For step S1312, the plug terminal is simulated and analyzed according to the adjusted touch position to obtain a simulation result. There are many simulation methods here, for example, computer simulation or physical simulation can be used, that is, a simulation experiment is performed on the touch position after the position adjustment to determine whether the corresponding parameters before and after the simulation are reasonable.

[0161] For step S1313, it is determined whether the touch position is reasonable based on the simulation results. If it is reasonable, the touch position is determined as the final position of the touch structure; if it is unreasonable, the touch position is updated based on the simulation results and S1312 is executed.

[0162] The above simulation analysis includes: input loss simulation analysis, reflection loss simulation analysis and crosstalk simulation analysis.

[0163] Continue with Figure 13 Taking the adjustment of the touch position shown as an example, input loss simulation analysis, reflection loss simulation analysis and crosstalk simulation analysis are performed before and after the touch position adjustment;

[0164] Please see the attached Figure 14 , attached Figure 14 The results of input loss simulation analysis before and after the touch position adjustment are shown in the attached figure. Figure 14In both tables, the horizontal axis represents frequency in GHz, and the vertical axis represents decibels (dB), a purely numerical unit. The steps shown in line segment X1 correspond to the required limits at different frequencies, also known as the SPEC line, which stands for Statistical Process Control. Curve X2 shows a set of different SI signal pairs (SI stands for Signal Integrity), typically randomly selected. It can be seen that there is no significant difference in input loss before and after adjusting the touch position. Therefore, from the perspective of input loss performance, the touch position adjustment is reasonable.

[0165] Please see the attached Figure 15 , attached Figure 15 The results of the reflection loss simulation analysis before and after the touch position adjustment are shown in the attached figure. Figure 15 In the above Figure 14 Similarly, the horizontal axis of both tables represents frequency in GHz, and the vertical axis represents decibels (dB), a purely numerical unit. The steps shown in line segment Y1 correspond to the limit requirements for different frequencies, also known as the SPEC line, which stands for Statistical Process Control. Curve Y2 shows a set of different SI signal pairs (SI stands for Signal Integrity), typically randomly selected. As can be seen, there is no significant difference in return loss before and after the touch position adjustment. Therefore, from the perspective of return loss performance, the touch position adjustment is reasonable.

[0166] Please see the attached Figure 16 , attached Figure 16 The results of crosstalk simulation analysis before and after the touch position adjustment are shown in the attached figure. Figure 16 In both tables, the horizontal axis represents frequency in GHz, and the vertical axis represents decibels (dB), a purely numerical unit. The steps shown in line segment Z1 correspond to the required limits for different frequencies, also known as the SPEC line, which stands for Statistical Process Control. Curve Z2 shows a set of different SI signal pairs (SI stands for Signal Integrity, usually randomly selected). It can be seen that there is no significant difference in crosstalk before and after the touch position adjustment. Therefore, from the perspective of crosstalk performance, the touch position adjustment is reasonable.

[0167] At this point, the position of the touch structure can be adjusted according to the above method.

[0168] In some embodiments, for optimizing the size of the touch structure, the size of the touch structure includes: the width of the touch structure and / or the spacing between two relatively arranged touch structures; that is, according to actual needs, only the width of the touch structure can be adjusted, or only the spacing between two relatively arranged touch structures can be adjusted. Of course, both the width of the touch structure and the spacing between two relatively arranged touch structures can be adjusted at the same time.

[0169] Please see the attached Figure 17 , with respect to step S13, the step of adjusting the width of the touch structure includes:

[0170] S1321, reducing the width of the touch structure to obtain a preliminary width;

[0171] S1322. Perform impedance simulation analysis on the plug-in terminal according to the preliminary width to obtain an impedance simulation result.

[0172] S1323: Determine whether the impedance simulation result is within the preset impedance range. If so, execute step S1324, that is, determine the preliminary width as the final width of the touch structure; if not, execute step S1325, update the preliminary width according to the impedance simulation result, and execute S1322.

[0173] Regarding step S1321, reducing the width of the touch structure reduces the contact area between the touch structure and the gold finger. This reduction in contact area helps reduce the sliding friction between the gold finger and the touch structure, thereby reducing the pulling force required to remove the card from the slot. The reduction in the width of the touch structure can be in units of 0.01mm, and of course, other values ​​can also be adjusted, which will not be elaborated in this article.

[0174] Please see the attached Figure 18 The width of the front touch structure is adjusted to 0.16±0.02mm, and the width of the rear touch structure is adjusted to 0.12±0.02mm. Based on the reduction in width, the pulling force required to be applied to the board when the board is removed from the slot can be reduced.

[0175] For step S1322, impedance simulation analysis is performed on the plug terminal according to the preliminary width obtained after adjustment to obtain the impedance simulation result; here, the impedance simulation result is obtained. Figure 18 Impedance simulation analysis was performed before and after the width adjustment. After impedance simulation analysis, it was found that after the width of the touch structure was reduced, the impedance only slightly increased by 0.7ohm, which fully met the design requirements.

[0176] Therefore, for step S1323, the impedance simulation result is within the preset impedance range, so the adjusted width can be used as the final width of the touch structure, that is, step S1324 is executed. If the impedance simulation result is not within the preset impedance range, the width of the touch structure needs to be readjusted, that is, step S1325 is executed, and step S1321 is repeated.

[0177] In some embodiments, see the attached Figure 19 , the step of adjusting the distance between the two relatively arranged touch structures in the above step S13 includes:

[0178] Step S1331: increasing the distance between two touching structures disposed opposite to each other to obtain a preliminary distance;

[0179] Step S1332: performing a low-power contact impedance test on the plug terminal to obtain a low-power contact impedance test result;

[0180] Step S1333: Determine whether the low-power contact impedance test result is within the preset low-power contact impedance range. If so, execute step S1334 to determine the preliminary spacing as the final spacing; if not, execute step S1335 to update the preliminary spacing according to the low-power contact impedance test result and execute S1332.

[0181] In step S1331, by increasing the distance between the two relatively arranged touch structures, the contact stress between the touch structure and the gold finger can be reduced, thereby reducing the pulling force that needs to be applied to the board when the board is removed from the slot. The distance can be increased in units of 0.01mm, and of course it can also be adjusted according to other values, which will not be elaborated in this article.

[0182] Please see the attached Figure 20 , which shows a cross-sectional view of the slot body 210. It can be seen that the spacing between the two relatively arranged touch structures 221 is increased. Before the adjustment, the spacing between the two relatively arranged touch structures 221 is 0.95 mm. After the adjustment, the spacing between the two relatively arranged touch structures 221 is 1.05 mm.

[0183] In step S1332, a low-power contact impedance test is performed on the plug terminal to obtain a low-power contact impedance test result; wherein the low-power contact impedance is Low Level Contact Resister, and the contact impedance is verified by the experiment to be within the corresponding range.

[0184] The gold fingers of the board realize the transmission of logic signals and electrical signals through the mechanical contact force between them and the plug-in terminals. This mechanical contact force is what the industry calls the terminal positive force (also called holding force). Since there is a corresponding medium when the plug-in terminals and the gold fingers are in contact, when the plug-in terminals and the gold fingers are in contact with each other, it will affect the signal flow and the passage of current, that is, it will affect the contact impedance, so there will be a contact resistance problem.

[0185] For example, using contacts on a gold-plated surface as an example, the relationship between low-power contact impedance and holding force is as follows: the greater the holding force, the lower the low-power contact impedance. When the holding force reaches a certain level, the reduction in low-power contact impedance becomes less noticeable. The actual requirements for low-power contact impedance are the primary consideration in holding force design. As the distance between two opposing contact structures increases, the holding force decreases accordingly. To prevent the holding force from falling below the lower limit, a low-power contact impedance test is performed to verify whether the holding force exceeds the specified limit by measuring the contact resistance.

[0186] Please see the attached Figure 21 ,It can be seen that by conducting low-power contact impedance experiments on the preliminary spacing of different groups, Figure 21 The horizontal axis is the holding force, the unit is gf (gram force), which refers to the magnitude of the gravity exerted on a mass of 1 gram on the surface of the earth. The vertical axis is the resistance, the unit is mohm (milliohm). Figure 21 Five groups of samples are shown in the figure to illustrate the relationship between low-power contact impedance and holding force. It can be seen that the greater the holding force, the smaller the contact impedance, that is, the smaller the resistance value. When the holding force is above 150gf, the resistance values ​​of different samples remain basically consistent.

[0187] For step S1333, when the preset low-power contact impedance range is met, the preliminary spacing can be determined as the final spacing, that is, step S1334 is executed. If the adjusted preliminary spacing is found through the low-power contact impedance test that the low-power contact impedance test result is not within the preset low-power contact impedance range, the preliminary spacing should be adjusted to meet the requirements of the low-power contact impedance test.

[0188] In some embodiments, the steps for low power contact impedance testing include:

[0189] Apply DC voltage to the plug terminals, the DC voltage is less than or equal to 20mV;

[0190] Apply current to the plug terminals, the current is 0.1A;

[0191] The low-power contact impedance experimental results of the plug-in terminal were obtained through testing.

[0192] In other words, to ensure that the plug terminals and gold fingers can be conductive in any environment and under any conditions of use, the contact resistance is tested with a voltage not exceeding 20mV (DC) and a current not exceeding 0.1A. If the power is too high, the dielectric layer will be broken down. Therefore, using low-power testing can effectively avoid this situation and ensure the accuracy and safety of the test.

[0193] In some embodiments, see the attached Figure 22 , after step S13, further comprising:

[0194] In step S14, the width c of the hook body 120 of the ear clip is calculated according to the formula c=d-2β, wherein d is the distance between the two oppositely arranged touch structures 221, and β is a preset distance range.

[0195] Please see the attached Figure 23 After the distance d between the two opposing contact structures 221 is determined, the width c of the hook 120 is calculated using the formula c = d - 2β. With this width c, the hook 120 can smoothly extend between the two opposing contact structures 221, thereby exerting an upward lifting force on the bottom of the gold finger. The preset distance β range is 0.08 ≤ β ≤ 0.12 mm, preferably 0.1 mm.

[0196] An embodiment of the present application also provides a board card slot designed using the above-mentioned board card slot design method.

[0197] In some embodiments, see the attached Figure 3 and attached Figure 8 The board slot 200 includes an ear button 100, a slot body 210 and a plug-in terminal 220. The plug-in terminal 220 is arranged in the slot body 210. Ear buttons 100 are rotatably provided at both ends of the slot body 210. The bottom of the ear button 100 is provided with a hook body 120 located in the slot body 210. The hook bodies 120 of the two ear buttons 100 are arranged opposite to each other. By rotating the two ear buttons 100, the two hook bodies 120 respectively apply a lifting force to the bottom of both ends of the board located in the slot body 210 to pop the board out of the slot body 210.

[0198] The present application also provides a circuit board, including a circuit board body, the circuit board body having a card slot, the card slot being the aforementioned card slot. Other components and configurations of the circuit board can be found in related art and will not be elaborated here.

[0199] The present application also provides an electronic device including a chassis and a circuit board disposed in the chassis, wherein the circuit board is the above-mentioned circuit board. The electronic device may be specifically a server, etc., which will not be elaborated herein.

[0200] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0201] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of this application.

Claims

1. A card slot design method, characterized in that: include: Determine the preliminary structure of the card slot according to the shape and size of the card, the preliminary structure including a slot body, plug-in terminals and ear buckles, the card is used to be inserted into a preset position of the slot body and connected to the plug-in terminals in the slot body; determining, based on the distance between the position where the card first contacts the plug-in terminal during insertion of the card into the slot and the preset position, a height to which the hook of the ear clip should be lifted when the card is removed from the preset position; The size of the ear button is optimized according to the lifting height, so that after the ear button is rotated, the plate is moved out of the groove body under the lifting action of the hook body of the ear button.

2. The board slot design method according to claim 1, wherein: The step of determining, based on the distance between the position where the card first contacts the plug-in terminal during insertion of the card into the slot and the preset position, the height to which the hook of the ear clip should be lifted when the card is removed from the preset position comprises: Determine a movement distance P1 of the longest gold finger of the card during insertion into the slot, starting from the initial contact position between the longest gold finger of the card and the plug-in terminal until the longest gold finger is inserted into the preset position; P is calculated according to the formula P=P1+Q-α, where P is the vertical distance between the position that the hook of the ear button should reach when the board needs to be taken out of the preset position and the preset position. The ear button is in a vertical state at the initial position, and the tip of the hook of the ear button is against the bottom of the shortest gold finger of the board. Q is the height difference between the shortest gold finger and the longest gold finger, and α is the preset distance.

3. The board slot design method according to claim 1 or 2, characterized in that: The step of optimizing the size of the ear clip according to the lifting height includes: Determine an angle θ by which the ear button should rotate from the initial position when the board is removed from the preset position; Determine the vertical distance h between the hook tip and the bottom of the hook, and the vertical distance H between the center of the rotating shaft of the ear clip and the bottom of the hook, along the length direction of the ear clip; The vertical distance G between the center of the rotating axis of the ear clip and the hook tip of the hook body in the length direction of the ear clip is calculated according to the formula G=Hh; Determine L using the formula (P-Q+h) / sinθ=L+(H / cosθ-G) / tanθ, Among them, P is the vertical distance between the position that the hook body of the ear button should reach when the board needs to be taken out of the preset position and the initial position of the hook body. The initial position is the position of the ear button in a vertical state, and at the initial position, the tip of the hook body is against the bottom of the shortest gold finger of the board, Q is the height difference between the shortest gold finger and the longest gold finger, and L is the vertical distance between the center of the rotating shaft of the ear button and the tip of the hook body in the length direction of the slot.

4. The board slot design method according to claim 2 or 3, characterized in that: The range of the preset distance α is 0<α≤0.05mm.

5. The board slot design method according to claim 3 or 4, characterized in that: The angle θ is an acute angle.

6. The board slot design method according to any one of claims 1 to 5, characterized in that: Before the step of determining, based on the distance between the position where the card first contacts the plug-in terminal during insertion of the card into the slot and the preset position, the step further includes: Based on the preliminary structure, determining a pulling force value that needs to be applied to the board when the board is removed from the preset position; Determine whether the pulling force value is less than or equal to a preset pulling force value. If so, execute the step of determining the lifting height of the hook of the ear buckle when the board is removed from the preset position based on the distance between the position where the board first touches the plug-in terminal during the process of inserting the board into the slot and the preset position.

7. The board slot design method according to claim 6, wherein: When it is determined that the pulling force value is greater than the preset pulling force value, before the step of determining, based on the distance between the position where the board first contacts the plug terminal during the insertion of the board into the slot and the preset position, the step further includes: The position of the contact structure on the plug-in terminal for initial contact with the board is determined and / or the size of the contact structure on the plug-in terminal for initial contact with the board is determined so that the pulling force value is less than or equal to a preset pulling force value.

8. The board slot design method according to claim 6 or 7, characterized in that: The preset pulling force value is 250N-300N.

9. The board slot design method according to claim 7, wherein: When determining the position of the contact structure on the plug-in terminal for initial contact with the board, the method includes: S1311, adjusting the touch structure by a preset distance in a direction close to the preset position to obtain a touch position; S1312, performing simulation analysis on the plug terminal according to the touch position to obtain a simulation result; S1313. Determine whether the touch position is reasonable based on the simulation result. If it is reasonable, determine the touch position as the final position of the touch structure. If it is unreasonable, update the touch position based on the simulation result and execute S1312.

10. The board slot design method according to claim 9, wherein: The simulation analysis includes: input loss simulation analysis, reflection loss simulation analysis and crosstalk simulation analysis.

11. The board slot design method according to any one of claims 7 to 10, characterized in that: When determining the size of the contact structure on the plug-in terminal for initial contact with the board, the size of the contact structure includes: the width of the contact structure and / or the distance between two oppositely arranged contact structures.

12. The board slot design method according to claim 11, wherein: When the size of the contact structure includes the width of the contact structure, the step of determining the size of the contact structure on the plug-in terminal for initial contact with the board includes: S1321, reducing the width of the touch structure to obtain a preliminary width; S1322, performing impedance simulation analysis on the plug-in terminal according to the preliminary width to obtain an impedance simulation result; S1323: Determine whether the impedance simulation result is within a preset impedance range. If so, determine the preliminary width as the final width of the touch structure. If not, update the preliminary width according to the impedance simulation result and execute S1322.

13. The board slot design method according to claim 11, wherein: When the size of the contact structure includes the distance between two contact structures arranged opposite to each other, the step of determining the size of the contact structure on the plug-in terminal for initial contact with the board includes: S1331, increasing the distance between the two touching structures arranged opposite to each other to obtain a preliminary distance; S1332, performing a low-power contact impedance test on the plug terminal to obtain a low-power contact impedance test result; S1333. Determine whether the low-power contact impedance test result is within a preset low-power contact impedance range. If so, determine the preliminary spacing as the final spacing; if not, update the preliminary spacing according to the low-power contact impedance test result and execute S1332.

14. The board slot design method according to claim 13, wherein: The step of performing a low-power contact impedance test on the plug-in terminal to obtain a low-power contact impedance test result comprises: Applying a DC voltage to the plug terminal, wherein the DC voltage is less than or equal to 20mV; Applying a current to the plug terminal, the current being 0.1 A; The low-power contact impedance experimental results of the plug-in terminal are obtained through testing.

15. The board slot design method according to claim 13 or 14, characterized in that: After the step of determining the size of the contact structure on the plug-in terminal for initial contact with the board, the method further includes: The hook width c of the ear clip is calculated according to the formula c=d-2β, wherein d is the distance between the two relatively arranged touch structures, and β is the preset distance range.

16. The board slot design method according to claim 15, wherein: The preset spacing range β is 0.08≤β≤0.12mm.

17. A card slot, characterized in that: The board slot is designed using the board slot design method according to any one of claims 1 to 16.

18. The board slot according to claim 17, wherein: The board slot includes a slot body, a plug-in terminal and an ear clip. The plug-in terminal is arranged in the slot body. The ear clips are rotatably provided at both ends of the slot body. The bottom of the ear clip is provided with a hook body located in the slot body. The hook bodies of the two ear clips are arranged opposite to each other. By rotating the two ear clips, the two hook bodies respectively apply a lifting force to the bottom of both ends of the board card located in the slot body to pop the board card out of the slot body.

19. A circuit board, characterized in that: It comprises a circuit board body, the circuit board body is provided with a board card slot, and the board card slot is the board card slot described in claim 17 or 18 above.

20. An electronic device comprising a chassis and a circuit board arranged in the chassis, characterized in that: The circuit board is the circuit board described in claim 19.

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