Stacking booths

Abstract

This application provides a stackable card holder, comprising a terminal module soldered to a printed circuit board (PCB), a shielding housing soldered to the PCB, a receiving space formed between the PCB and the shielding housing, and a card tray insertable and removable within the receiving space. The card tray includes a card receiving space and longitudinal arms located on either side of the card receiving space. The longitudinal arms project downward toward the bottom of the PCB and form support bars that support the PCB. The upper portion of the longitudinal arms is limited by the shielding housing. This application can reduce product thickness.

Description

Technical Field

[0001] The present application relates to the field of electrical connectors, and in particular to a stacking card socket. Background Art

[0002] The memory of a mobile phone generally exists in two forms, namely built-in memory (ROM) and extended memory (T-Flash). Due to the high price of built-in memory, mobile phone manufacturers generally leave a memory expansion card slot for users to choose to expand the memory. At the same time, the identity card (SIM) is a number card that must be installed in the mobile phone. Usually, the mobile phone will be provided with a SIM card slot and a TF card slot for inserting various electronic cards. China's patent CN209183801U discloses a stacked multi-in-one card slot, which includes a first terminal module provided on a printed circuit board, a second terminal module formed on the top wall of a metal shell, and a card tray that moves between the first and second terminal modules. The first and second cards that are electrically in contact with the first and second terminal modules are placed on the upper and lower sides of the card tray. The above only solves the problem of the upper and lower card structures, and the technical solution of the market demand for 2 SIM cards and 1 TF expansion card is not solved. With the powerful function of the camera, the demand for UHS (ultra-high speed) TF cards is also increasing. How to solve the stability of high-frequency transmission performance is particularly important.

[0003] The traditional card holder is limited in upper and lower positions by a plurality of supporting parts formed by inward bending on the top wall and side walls of the shielding shell. This requires increasing the thickness of the supporting parts of the shielding shell, thereby increasing the thickness of the card holder. Summary of the Invention

[0004] In view of this, it is necessary to provide a stacking card holder that limits the upper and lower positions of the card holder by shielding the shell and the printed circuit board, so as to reduce the overall thickness of the product.

[0005] In order to solve the above technical problems, the present application provides a stacked card holder, including a terminal module welded on a printed circuit board, a shielding shell welded on the printed circuit board, a receiving space formed between the printed circuit board and the shielding shell, and a card tray that can be plugged in and out of the receiving space, the card tray including a card receiving space and longitudinal arms located on both sides of the card receiving space, the longitudinal arms protruding downward toward the bottom of the printed circuit board to form a support bar supported on the printed circuit board, and the upper limit of the longitudinal arm is located on the shielding shell.

[0006] Preferably, the support bar is a structure that is wide at the top and narrow at the bottom, and the narrower lower portion of the support bar supports and slides on the printed circuit board.

[0007] Preferably, a limiting groove is provided on the outer side of the upper surface of the longitudinal arm, and the shielding shell includes a top wall and side walls formed by vertically bending downward from the two lateral sides of the top wall, and the top wall includes a main body plate and a front plate located at the front end of the main body plate, and the side walls are formed by bending from the two lateral sides of the main body plate, and the two lateral sides of the front plate are bent downward to form limiting walls pressed into the limiting groove.

[0008] Preferably, the card holder also includes a front end portion formed at the front end of the partition plate, a cover portion formed in front of the front end portion, and a tail arm formed at the rear end of the partition plate. The limit groove forms a limit wall at the front end portion, and the limit wall is limited to the limit wall to prevent the card holder from being over-inserted.

[0009] Preferably, the width between the pair of limiting walls is smaller than the width between the pair of side walls, and the lower ends of the limiting walls are bent vertically outward and extended to form a pressing portion pressed on the upper surface of the limiting groove.

[0010] Preferably, the partition plate is made of a metal plate, and a plastic body is integrally injection-molded on the outer periphery of the partition plate. The plastic body includes the longitudinal arm, the tail arm and the front end portion. The longitudinal arm, the tail arm and the front end portion are arranged on the upper surface of the partition plate to form a first card holding space, and the longitudinal arm, the tail arm and the front end portion are arranged on the lower surface of the partition plate to form a second and third card holding spaces arranged in the longitudinal direction. The front end portion includes first and third clamping portions protruding rearward and extending into the first and third card holding spaces, and the longitudinal arm is located at the position of the second card holding space and is provided with a second clamping portion protruding into the second card holding space.

[0011] Preferably, the terminal module includes two first terminal modules welded to the upper surface of the printed circuit board and corresponding to the second and third card spaces, and a second terminal module fixed on the top wall of the shielding shell and corresponding to the first card space. The first card space is a TF card slot, and the second and third card spaces are SIM card slots.

[0012] Preferably, the second terminal module includes a second terminal group and a second insulator that is injection molded into one piece with the second terminal group, and each conductive terminal of the second terminal group includes an elastic arm extending downward into the accommodating space, an extension portion extending from the rear end of the elastic arm to be embedded in the second insulator, and a solder foot that is bent downward from the rear end of the extension portion and extends to the surface of the printed circuit board for soldering.

[0013] Preferably, after the second insulator is injection-molded, the second terminal group and the shielding shell are fixed together.

[0014] Preferably, one of the longitudinal arms is provided with a mounting opening on the inner side of the second accommodating space, the second clamping portion is installed and fixed in the mounting opening, the partition plate body is provided with a notch at a position corresponding to the mounting opening, the mounting opening includes a step portion and a mounting hole formed along the notch and passing through the step portion, the second clamping portion includes a base portion fixed in the mounting opening and an elastic strip extending from the base portion into the second card accommodating space, the elastic body elastically supports the edge of the SIM card placed in the second card accommodating space, the second clamping portion also includes a avoidance portion provided on the lower side of the base portion to avoid the step portion and a fixing column protruding from the bottom side of the base portion and fixed in the mounting hole.

[0015] The stacked card holder of the present application forms a support bar that directly slides in contact with the printed circuit board by protruding downward at the bottom of the longitudinal arm of the card holder, so that the upper and lower limits of the card holder are achieved by pressing from above by the shielding shell and supporting the printed circuit board from below, which can avoid the technical problem of the prior art that the side wall of the shielding shell needs to be bent inward to support the card holder, thereby thickening the card holder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0017] Figure 1 A three-dimensional combination diagram of the stacked card holder of this application;

[0018] Figure 2 This is a partially exploded view of the stackable card holder for this application without the card tray;

[0019] Figure 3 This is a three-dimensional combined diagram of the stacked card holder of the present application without the printed circuit board and the first terminal module thereon;

[0020] Figure 4 A three-dimensional diagram of the shielding housing, the second terminal module, and the card ejection mechanism of the stackable card holder of the present application;

[0021] Figure 5 A three-dimensional diagram of the shielding shell of the stackable card holder of the present application;

[0022] Figure 6 A three-dimensional diagram of the second terminal module of the stacked card holder of the present application;

[0023] Figure 7 A three-dimensional view of the second terminal module of the stacked card holder of the present application from another angle;

[0024] Figure 8This is a three-dimensional diagram of the second terminal group of the stacked card holder of the present application;

[0025] Figure 9 For the Figure 6 The cross-sectional view along the dotted line AA and its partial enlarged view are shown;

[0026] Figure 10 for Figure 9 The cross-sectional view shown is a cross-sectional view of the second terminal group in a working state after the TF card is inserted;

[0027] Figure 11 This is a three-dimensional image of the card tray for this application with a TF card installed;

[0028] Figure 12 A three-dimensional image of the card holder for this application;

[0029] Figure 13 This is a three-dimensional image of the card holder from another angle;

[0030] Figure 14 A three-dimensional diagram of the metal insert of the card holder of this application;

[0031] Figure 15 A three-dimensional view and a partially enlarged view of the card holder for this application without the third elastic clip;

[0032] Figure 16 A three-dimensional diagram of the third elastic clip of the card holder of this application;

[0033] Figure 17 This is a three-dimensional diagram of the card tray supported on the printed circuit board of this application;

[0034] Figure 18 For the Figure 17 A cross-sectional view taken along the dotted line BB is shown. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions of this application will be described clearly and completely in conjunction with the specific embodiments of this application and the corresponding drawings. Figure 1 The card ejection direction X is longitudinally forward; the Y direction is horizontally right; and the Z direction is vertically upward.

[0036] See also Figures 1 to 5As shown, the stacked card holder of the present application includes a first terminal module 60 welded on a printed circuit board 10, a shielding shell 30, a second terminal module 40 arranged on the inner side of the shielding shell 30, a card ejection mechanism 50 assembled on a lateral side of the shielding shell 30, an insulating body 30, a first terminal group 40 arranged on the top wall 31 of the insulating body 30, a receiving space (unnumbered) formed between the first terminal module 60 and the second terminal module 40, and a card tray 20 that moves in the receiving space.

[0037] Key References Figure 5 As shown, the shielding housing 30 includes a base 31 and two side walls 32 extending downwardly from the base 31 on either side. The base 31 includes a main plate 311 and a front plate 312 extending forward from the main plate 311. The side walls 32 are formed by bending and extending from the main plate 311 on either side. The front plate 312 is formed by bending and extending from either side to form limiting walls 33. The width between the limiting walls 33 is smaller than the width between the side walls 32. The main plate 311 is provided with a window 313, a connecting beam 314 is provided in the middle of the window 313 in the transverse direction, a switch static terminal 315 is formed by bending and extending downwardly from the middle of the rear end of the main plate 311, a retaining wall 316 is formed by bending and extending downwardly from both sides of the rear end of the main plate 311, and a rivet hole 317 is provided in the main plate 311 near the retaining wall 316. The sidewalls 32 , the limiting walls 33 , and the lower ends of the retaining walls 316 are bent to form soldering portions 322 , 331 , and 318 that are soldered to the printed circuit board 10 .

[0038] One of the two side walls 32 is formed with an elastic piece 321 that extends into the receiving space to apply an elastic force to the card tray 20. The other side wall 32 has a mounting portion formed inside the mounting portion for mounting the card ejection mechanism 50. The elastic piece 321 is formed by tearing downward from the main plate 311 inside the mounting portion. The mounting portion is located between the elastic piece 321 and the side wall 32. The elastic piece 321 on one side of the mounting portion includes an elastic portion that extends into the receiving space, connecting portions 323 located on either side of the elastic portion and connected to the main plate 311, and pressure pieces 324 formed at both ends of the elastic piece 321 and extending toward the side wall 32 to apply an elastic force. The distance between the two limiting walls 33 is less than the distance between the two side walls 32, but less than the minimum distance between a pair of elastic pieces 321. The side wall 32 on the side without the mounting portion is torn and punched inward at the rear end to form a limiting hook 325 that protrudes into the receiving space.

[0039] The card ejection mechanism 50 includes a push rod 51 mounted in the mounting portion of the shielding housing 30, a cam 52 riveted to the rivet hole 317, and a rivet 53 for riveting the cam 52 into the rivet hole 317. The card ejection mechanism 50 is well known in the industry and will not be described in detail here.

[0040] The first terminal module 60 includes two SIM card terminal modules 61 and 62 arranged in a longitudinal direction. Each SIM card terminal module 61 and 62 includes a first terminal group and a first insulator forming the first terminal group as a whole.

[0041] See also Figures 4 to 10 As shown, the second terminal module 40 includes a second terminal group 41 and a second insulator 42 forming the second terminal group 41 on the inner surface of the main plate portion 311 of the shielding housing 30. In a specific embodiment, the first terminal module 40 can also be assembled on the inner side of the shielding housing 30.

[0042] Each conductive terminal of the second terminal group 41 includes an elastic arm 411 extending downward into the receiving space, an extension portion 412 extending backward from the elastic arm 411, and a solder foot 413 bent downward and extended from the rear end of the extension portion 412. All the conductive terminals of the second terminal group 41 are connected as a whole at the extension portion 412, and the connected part is cut off after injection molding to electrically isolate each conductive terminal from each other. The two outermost conductive terminals extend laterally outward to form a connecting strip 414, and the connecting strip 414 is connected as a whole at the front to form a combined strip 415. The combined strip 415 is cut and isolated after injection molding. The second terminal module 40 is a TF card terminal module, specifically a UHS (ultra-high speed) TF card terminal module.

[0043] The elastic arm 411 of the second terminal assembly 41 includes a contact portion 4111 extending into the receiving space, first and second elastic arms 4112 and 4113 extending obliquely upward from the contact portion 4111, respectively, in the front and rear directions, a free end portion 4114 extending horizontally from the second elastic arm 4112 by bending forward, and a retaining portion 4115 formed between the free end portion 4114 and the second elastic arm 4112. The width of the free end portion 4114 is greater than the width of the retaining portion 4115.

[0044] The second insulator 42 includes a main body 421 that fits against the inner wall of the main plate portion 311 of the shielding housing 30, a deformation opening 422 defined in the main body 421 corresponding to the elastic arms 411 of the second terminal assembly 41, and a rear wall 423 extending downward from the rear end of the main body 421. The rear wall 423 includes a hole structure 424 corresponding to the rivet hole 317 of the shielding housing 30, through which the rivet 53 passes. The extension 412 of the second terminal assembly 41 is integrally formed with the rear end of the main body 421. The solder legs 413 extend from the bottom surface of the rear wall 423 and are soldered to the printed circuit board 10. The free end 4114 of the elastic arms 411 of the second terminal assembly 41 is located forward of the card insertion end relative to the extension 412. A limiting portion 425 for limiting the free end portion 4114 is formed on the fitting body 421 in front of the deformation mouth 422, and the limiting portion 425 includes an extension hole 4251 that passes through the fitting body 421 in the vertical direction, a limiting step 4254 protruding from the bottom side of the limiting portion 425, and an upper limiting beam 4252 and a lower limiting beam 4253 that clamp the upper and lower sides of the locking portion 4115. The upper limit beam 4252 and the lower limit beam 4253 are vertically offset. After the second terminal assembly 41 is injection molded, only one surface of the retaining portion 4115 of the second terminal assembly 41 is molded on the lower surface of the upper limit beam 4252 and the upper surface of the lower limit beam 4253. When the contact portion 4111 of the elastic arm 411 is pressed by the TF card, the retaining portion 4115 can easily disengage from the joint surface between the upper limit beam 4252 and the lower limit beam 4253, allowing the free end 4114 to become a movable free end. The width of the retaining portion 4115 is smaller than that of the free end 4114, ensuring that the free end 4114 remains within the extension hole 4251 and does not fall out backward from the extension hole 4251. The free end portion 4114 can move freely in the extension hole 4251. The setting of the limiting step 4254 ensures that when the free end portion 4114 moves downward to the maximum stroke, the free end of the free end portion 4114 is always located above the limiting step 4254 and does not enter the receiving space downward.

[0045] The deformation opening 422 corresponds to the window 313 of the shielding housing 30. The connecting beam 314 is located above the contact portion 4111. The first and second elastic arms 4112 and 4113 are longitudinally arranged below the window 313. The connecting beam 314 prevents the window 313 from being too large, which could cause the window edge to deform. The connecting beam 314 is located directly above the contact portion 4111, which is the farthest portion from the main plate 311. This prevents the contact portion 4111 from contacting the main plate 311 and causing a short circuit when squeezed.

[0046] The stacked card holder of the present application is used for ultra-high-speed TF cards, and the free end portion 4114 of the second terminal group 41 needs to be located in front of the card insertion side, so that the extension portion 412 and the solder foot 413 extend directly backward from the elastic arm 411 to the bottom surface of the rear wall 423, avoiding the problem of traditional straight insertion method (that is, in order to solve the problem of terminal rubbing, the free end portion 4114 is set at the rear so that the TF is inserted in a straight insertion) requiring the extension portion 412 and the solder foot 413 to be bent backward and extended from the front end of the elastic arm 411, thereby affecting ultra-high-speed signal transmission.

[0047] The stackable card holder of the present application also includes a switch movable terminal 80 mounted on the rear wall 423 of the second insulator 42. The switch movable terminal 80 includes a fixed portion 81 fixed within the rear wall 423, a contact portion 83 bent from the fixed portion 81 and extending into the receiving space, and a contact end portion 84 bent backward from the contact portion 83 to form an electrical contact with the switch static terminal 315. In the initial state, the contact end portion 84 is in electrical contact with the switch static terminal 315. After the card tray 20 is inserted, the rear end of the card tray 20 pushes backward against the contact portion 83 to disconnect the contact end portion 84 from the switch static terminal 315 and realize the switching function. The rear wall 423 is provided with an avoidance hole 4231 at the position corresponding to the contact end 84, and a crossbeam 4232 connecting the two lateral sides of the rear wall 423 is formed on the bottom side of the avoidance hole 4231. The design of the crossbeam 4232 helps to reduce the plastic warping problem of the rear wall 423 caused by the avoidance hole 4231.

[0048] Please continue reading Figures 11 to 16As shown, the card tray 20 of the present application includes a partition plate 21 and a plastic body 22 molded on the outer periphery of the partition plate 21. The partition plate 21 includes a partition plate body 211, a through-hole 214 opened at the front end of the partition plate body 211, and a notch 213 opened at the lateral outer side of the rear end of the partition plate body 211. The outer periphery 212 of the partition plate body 211 is molded and embedded in the plastic body 22. The plastic body 22 includes a pair of longitudinal arms 221 molded on the outer periphery 212 on both sides of the lateral side of the partition plate body 211, a tail arm 222 molded on the outer periphery 212 on the rear side of the partition plate body 211, a front end 223 molded on the outer periphery 212 on the front side of the partition plate body 211, and a cover 224 formed at the front end of the front end 223. The upper side of the partition plate 211 and the plastic body 22 enclose a first card storage space S1 (TF card). The lower side of the partition plate 211 and the plastic body 22 enclose a second and third card storage space S2 and S3 (SIM card) arranged in a longitudinal direction. A partition bar 225 is formed between the second and third card storage spaces S2 and S3.

[0049] The longitudinal arm 221 has a slot 2213 on its lateral outer side for retaining the elastic piece 321 of the shielding shell 30. A limiting slot 2211 is defined on the upper surface of the longitudinal arm 221. The front end of the limiting slot 2211 forms a limiting wall 2212 at the front end 223. A limiting notch 2214 is defined at the rear end of the longitudinal arm 221, corresponding to the position of the limiting hook 325 of the shielding shell 30. The limiting hook 325 engages within the limiting notch 2214 to prevent over-insertion of the card tray 20. The limiting walls 33 on both sides of the front plate 312 of the shielding shell 30 slide on the limiting slot 2211 and are retained by the limiting walls 2212 of the card tray 20, preventing further insertion of the card tray 20. The limiting wall 33 further includes a pressing portion 332 vertically bent outward from the lower end of the limiting wall 33 . The pressing portion 332 is pressed into the limiting groove 2211 . The welding portion 331 is formed by vertically bending downward and extending from the pressing portion 332 .

[0050] The stacked card holder of the present application is positioned at the limiting wall 2212 at the front end of the limiting groove 2211 of the card holder through the limiting walls 33 on the horizontal sides of the shielding shell 30, and then a limiting hook 325 extending into the receiving space is set at the rear end of the side wall 32 of the shielding shell 30, and a limiting notch 2214 cooperating with the limiting hook 325 is set at the rear end of the longitudinal wall 221 of the card holder 20 to achieve double locking to prevent over-insertion.

[0051] The front end 223 of the plastic body 22 protrudes from its upper side toward the first card storage space S1 to form a first clamping portion 2231. The front end 223 protrudes from its lower side toward the third card storage space S3 to form a third clamping portion 2232. The first and third clamping portions 2231, 2232 are elastic structures. When a first and third electronic cards are inserted into the first and third card storage spaces S1, S3, they abut against the outer edges of the first and third electronic cards, preventing them from falling out. A second clamping portion 23 is mounted or formed on the longitudinal arm 221 of the plastic body 22 in the second card storage space S2. The second clamping portion 23 is used to abut against a second electronic card inserted into the second card storage space S2 to prevent it from falling out. The longitudinal arm 221 is provided with a mounting opening 24 at the location corresponding to the second clamping portion 23. The mounting opening 24 includes a step 241 located adjacent to the second card receiving space S2 and a mounting hole 242 corresponding to the notch 213 of the partition plate 21. The second clamping portion 23 includes a base 231 accommodated within the mounting opening 24, a relief portion 232 formed below the base 231 to avoid the step 241, a fixing column 233 secured within the mounting hole 242, and a plurality of elastic members 234 extending from the inner side of the base 231 into the second card receiving space S2. The second clamping portion 23 is made of a flexible plastic material, such as silicone. The elastic members 234 abut against the second electronic card to prevent it from falling out.

[0052] Because the longitudinal length of two SIM cards is greater than that of a single TF card, the first clamping portion 2231 is positioned further back than the third clamping portion 2232. The card tray's partition plate 21 and the plastic body 22 can also be directly integrated using metal processing, such as powder metallurgy or die-casting. In this case, the first and third clamping portions 2231 and 2232 need to be installed using the same installation method as the second clamping portion 23.

[0053] The card tray 20 of this application is provided with a first card storage space S1 for TF cards on the upper side, and two second and third card storage spaces S2 and S3 for SIM cards arranged longitudinally on the lower side. The front end 223 of the plastic body 22 protrudes toward the first and third card storage spaces S1 and S3 to form first and third clamping portions 2231 and 2232 to prevent the first and third electronic cards from falling out when the card tray is turned over. To solve the problem of preventing the second electronic card from falling out in the second card storage space S2, a second clamping portion 23 is provided on the longitudinal arm 221 corresponding to the second card storage space S2. This card tray of this application realizes the all-in-one technical solution of two SIM cards and one TF card.

[0054] Key References Figure 13 、 Figure 17 、 Figure 18 As shown, the bottom of the longitudinal arm 221 of the card tray 20 protrudes downward to form a support bar 2215, and the support bar 2215 is directly supported to slide on the printed circuit board 10, and the upper limit of the card tray 20 is located below the top wall 31 of the shielding shell 30, mainly by the limiting wall 33 being supported and limited downward in the limiting groove 2211 on the upper side of the longitudinal arm 221 of the card tray 20. In this way, there is no need to fold inward on the side wall 32 of the shielding shell 30 to form a supporting structure for supporting the card tray 20, which further reduces the thickness of the product.

[0055] The support bar 2215 is wide at the top and narrow at the bottom, which reduces the contact sliding area between the support bar 2215 and the printed circuit board 10, avoids occupying too much space on the printed circuit board 10, and also avoids the problem of excessive friction caused by too large a contact area, which may damage the printed circuit board 10.

[0056] The stacked card holder of the present application forms a support bar 2215 that directly slides in contact with the printed circuit board 10 by protruding downward at the bottom of the longitudinal arm 221 of the card holder 20, so that the upper and lower limits of the card holder 20 are achieved by pressing from above by the shielding shell 30 and supporting the printed circuit board 10 from below, which can avoid the technical problem of the prior art that the side wall 32 of the shielding shell 30 needs to be bent inward to support the card holder 20, thereby thickening the card holder.

[0057] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A stackable card holder, comprising a terminal module welded to a printed circuit board, a shielding shell welded to the printed circuit board, a receiving space formed between the printed circuit board and the shielding shell, and a card tray that can be plugged and unplugged in the receiving space, wherein the card tray includes a card receiving space and longitudinal arms located on both sides of the card receiving space, characterized in that: The longitudinal arm protrudes downward toward the bottom of the printed circuit board to form a support bar supported on the printed circuit board, and the upper limit of the longitudinal arm is located on the shielding shell; the support bar is a structure that is wide at the top and narrow at the bottom, and the narrower lower part of the support bar supports sliding on the printed circuit board.

2. The stackable card holder according to claim 1, wherein: A limiting groove is provided on the outer side of the upper surface of the longitudinal arm, and the shielding shell includes a top wall and side walls formed by vertically bending downward from the two lateral sides of the top wall. The top wall includes a main body plate and a front plate located at the front end of the main body plate. The side walls are formed by bending from the two lateral sides of the main body plate, and the two lateral sides of the front plate are bent downward to form limiting walls pressed into the limiting groove.

3. The stackable card holder according to claim 2, wherein: The card holder also includes a front end portion formed at the front end of the partition plate, a cover portion formed in front of the front end portion, and a tail arm formed at the rear end of the partition plate. The limit groove forms a limit wall at the front end portion, and the limit wall is limited to the limit wall to prevent the card holder from being over-inserted.

4. The stackable card holder according to claim 3, wherein: The width between the pair of limiting walls is smaller than the width between the pair of side walls, and the lower ends of the limiting walls are bent vertically outward and extended to form a pressing portion pressed on the upper surface of the limiting groove.

5. The stackable card holder according to claim 3, wherein: The partition plate is made of a metal plate, and a plastic body is integrally injection-molded on the outer periphery of the partition plate. The plastic body includes the longitudinal arm, the tail arm and the front end portion. The longitudinal arm, the tail arm and the front end portion are arranged on the upper surface of the partition plate to form a first card holding space, and the longitudinal arm, the tail arm and the front end portion are arranged on the lower surface of the partition plate to form a second and third card holding spaces arranged in the longitudinal direction. The front end portion includes first and third clamping portions protruding rearward and extending into the first and third card holding spaces, and the longitudinal arm is provided with a second clamping portion protruding into the second card holding space at the position of the second card holding space.

6. The stackable card holder according to claim 5, wherein: The terminal module includes two first terminal modules welded to the upper surface of the printed circuit board and corresponding to the second and third card spaces, and a second terminal module fixed on the top wall of the shielding shell and corresponding to the first card space. The first card space is a TF card slot, and the second and third card spaces are SIM card slots.

7. The stackable card holder according to claim 6, wherein: The second terminal module includes a second terminal group and a second insulator integrally formed by injection molding the second terminal group. Each conductive terminal of the second terminal group includes an elastic arm extending downward into the receiving space, an extension portion extending from a rear end of the elastic arm to be embedded in the second insulator, and a solder foot bent downward from a rear end of the extension portion to be soldered to the surface of the printed circuit board. The elastic arm is bent forward and extended horizontally to form a free end portion. A locking portion is formed between the free end portion and the elastic arm. The width of the free end portion is greater than the width of the locking portion. The free end portion is located in front of the card insertion end relative to the extension portion. A limiting portion for limiting the free end is formed on the second insulator, and the limiting portion includes an extension hole penetrating the fitting body in the vertical direction, a limiting step protruding from the bottom side of the limiting portion, and an upper limiting beam and a lower limiting beam clamping the upper and lower sides of the clamping portion; the upper limiting beam and the lower limiting beam are staggered in the vertical direction.

8. The stackable card holder according to claim 7, wherein: After the second insulator is injection-molded, the second terminal group and the shielding shell are fixed together.

9. The stackable card holder according to claim 5, wherein: One of the longitudinal arms is provided with a mounting opening on the inner side of the second accommodating space, and the second clamping portion is installed and fixed in the mounting opening. The partition plate body is provided with a notch at a position corresponding to the mounting opening, and the mounting opening includes a step portion and a mounting hole formed along the notch and passing through the step portion. The second clamping portion includes a base portion fixed in the mounting opening and an elastic strip extending from the base portion into the second card accommodating space, and the elastic body elastically supports the edge of the SIM card placed in the second card accommodating space. The second clamping portion also includes a avoidance portion provided on the lower side of the base portion to avoid the step portion and a fixing column protruding from the bottom side of the base portion and fixed in the mounting hole.

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