Stacked card holder

Abstract

A stacked card socket includes a first terminal module, a shielding shell covering the first terminal module, a second terminal module formed on the shielding shell and oppositely arranged with the first terminal module, a receiving space formed between the first terminal module and the second terminal module, and a card holder pluggable in the receiving space. The shielding shell includes a top wall and side walls bent downwardly and extended from both sides of the top wall. The second terminal module includes a second terminal group and a second insulator holding the second terminal group on the top wall. Each conductive terminal of the second terminal group includes an elastic arm downwardly extended into the receiving space, an extension portion rearwardly extended from the elastic arm, and a solder tail bent downwardly and extended from the extension portion. The card socket is suitable for super-speed TF card.

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 holder 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 holder and a TF card holder for inserting various electronic cards. Patent No. CN209183801U discloses a stacked multi-in-one card holder, 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. Summary of the Invention

[0003] In view of this, it is necessary to provide a stacked card holder that carries ultra-high-speed TF cards and transmits high-frequency signals.

[0004] In order to solve the above technical problems, the present application provides a stacked card socket, including a first terminal module, a shielding shell covering the first terminal module, a second terminal module formed on the shielding shell and arranged opposite to the first terminal module, a receiving space formed between the first terminal module and the second terminal module, and a card tray that can be plugged in and out of the receiving space, the shielding shell including a top wall and side walls formed by bending downward from both sides of the top wall, the second terminal module including a second terminal group and a second insulator for fixing the second terminal group on the top wall, each conductive terminal of the second terminal group including an elastic arm extending downward into the receiving space, an extension portion extending backward from the elastic arm, and a solder foot formed by bending downward from the extension portion, the front end of the elastic arm is formed with a free end portion located on the card insertion end side, the second insulator is provided with an extension hole at the position of the free end portion, and the free end portion is limited to deformation and movement within the extension hole.

[0005] Preferably, the elastic arm comprises a contact part extending into the receiving space, a second elastic arm and a first elastic arm extending obliquely upward from both ends of the contact part, respectively, the extending part is formed by extending backward from the first elastic arm at the rear side, and the free end part is formed by bending horizontally from the front end of the second elastic arm.

[0006] Preferably, a clamping part is formed between the second elastic arm and the free end part, and the width of the clamping part is smaller than the width of the free end part.

[0007] Preferably, the top wall of the shielding shell is provided with a window and a deformation port corresponding to the position of the elastic arm of the second terminal group, respectively, for the elastic deformation of the elastic arm; the front end of the deformation port is provided with a limiting part, the extending hole is formed through the limiting part upward and downward, and the limiting part is provided with an upper limiting beam and a lower limiting beam on both sides of the clamping part, respectively, near the side of the deformation port.

[0008] Preferably, the upper limiting beam and the lower limiting beam are arranged in a staggered manner in the longitudinal direction, that is, the projections of the upper limiting beam and the lower limiting beam in the vertical direction do not coincide, the lower limiting beam is near the side of the deformation port, and the upper limiting beam is near the side of the extending hole.

[0009] Preferably, the limiting part protrudes downward to form a limiting step at the front end of the extending hole; the second insulator comprises a fitting main body provided with the deformation port and a rear wall extending downward from the rear end of the fitting main body, the soldering leg extends downward from the rear wall and is exposed to the bottom surface of the rear wall, and the fitting main body is formed in one piece with the top wall.

[0010] Preferably, the clamping holder comprises a partition plate and a plastic body formed on the outer periphery of the partition plate, the plastic body comprises longitudinal arms formed on both sides of the partition plate in the transverse direction, a tail arm formed on the rear end of the partition plate, a front end part formed on the front end of the partition plate, and a cover part formed on the front side of the front end part, the longitudinal arms, the tail arm, and the front end part are arranged to form a first clamping space corresponding to the second terminal module on the upper surface of the partition plate, the longitudinal arms, the tail arm, and the front end part are arranged to form a second clamping space and a third clamping space corresponding to the first terminal module in the longitudinal direction on the lower surface of the partition plate, and a super-speed TF card is inserted into the first clamping space, when the clamping holder is inserted, the super-speed TF card is pressed upward from the side of the free end part of the elastic arm to the contact part.

[0011] Preferably, the front end part comprises first clamping parts and third clamping parts protruding into the first clamping space and the third clamping space, respectively, and the longitudinal arms are provided with second clamping parts protruding into the second clamping space at the position of the second clamping space.

[0012] Preferably, the first terminal module is directly welded to a printed circuit board, the side wall of the shielding shell is welded to the printed circuit board, and the bottom of the longitudinal arm protrudes downward to form a support bar that is wide at the top and narrow at the bottom, and the support bar is supported on the printed circuit board.

[0013] Preferably, a limiting groove is provided on the outer side of the upper surface of the longitudinal arm, and the limiting groove forms a limiting step at the front end position, and the top wall includes a main plate portion and a front plate portion located at the front end of the main plate portion, and the side walls are formed by bending from the lateral sides of the main plate portion, and the lateral sides of the front plate portion are bent downward to form limiting walls that support and limit the limiting step, and the width between a pair of the limiting walls is smaller than the width between a pair of side walls, and the lower end of the limiting wall is bent vertically outward and extended to form a pressing portion pressed on the upper surface of the limiting groove.

[0014] The stacked card socket of the present application is used for ultra-high-speed TF cards, and the free end of the second terminal group needs to be located in front of the card insertion side, so that the extension part and the solder foot extend directly backward from the elastic arm to the bottom surface of the rear wall, avoiding the problem of traditional straight insertion method (that is, to solve the problem of terminal rubbing, the free end is set at the rear so that the TF is inserted in a straight insertion) which requires the extension part and the solder foot to be bent backward from the front end of the elastic arm to affect ultra-high-speed signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 A three-dimensional combination diagram of the stacked card holder of this application;

[0017] Figure 2 This is a partially exploded view of the stackable card holder for this application without the card tray;

[0018] 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;

[0019] 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;

[0020] Figure 5 A three-dimensional diagram of the shielding shell of the stackable card holder of the present application;

[0021] Figure 6 A three-dimensional diagram of the second terminal module of the stacked card holder of the present application;

[0022] Figure 7 A three-dimensional view of the second terminal module of the stacked card holder of the present application from another angle;

[0023] Figure 8 This is a three-dimensional diagram of the second terminal group of the stacked card holder of the present application;

[0024] Figure 9 For the Figure 6 The cross-sectional view along the dotted line AA and its partial enlarged view are shown;

[0025] 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;

[0026] Figure 11 This is a three-dimensional image of the card tray for this application with a TF card installed;

[0027] Figure 12 A three-dimensional image of the card holder for this application;

[0028] Figure 13 This is a three-dimensional image of the card holder from another angle;

[0029] Figure 14 A three-dimensional diagram of the metal insert of the card holder of this application;

[0030] Figure 15 A three-dimensional view and a partially enlarged view of the card holder of this application without the third elastic clip;

[0031] Figure 16 A three-dimensional diagram of the third elastic clip of the card holder of this application;

[0032] Figure 17 This is a three-dimensional diagram of the card tray supported on the printed circuit board of this application;

[0033] Figure 18 For the Figure 17 A cross-sectional view taken along the dotted line BB is shown. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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 .

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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 4113 by bending forward, and a retaining portion 4115 formed between the free end portion 4114 and the second elastic arm 4113. The width of the free end portion 4114 is greater than the width of the retaining portion 4115.

[0043] The second insulator 42 includes a fitting main body 421 fitted on the inner wall surface of the main plate portion 311 of the shielding case 30, a deformation opening 422 opened on the fitting main body 421 at a position corresponding to the elastic arm 411 of the second terminal group 41, and a rear wall 423 formed downward from the rear end of the fitting main body 421. The rear wall 423 is provided with a hole structure 424 for the rivet 53 to pass through, corresponding to the riveting hole 317 of the shielding case 30. The extension portion 412 of the second terminal group 41 is integrally formed at the rear end of the fitting main body 421, and the soldering leg 413 extends from the bottom surface of the rear wall 423 and is soldered to the printed circuit board 10. The free end portion 4114 of the elastic arm 411 of the second terminal group 41 is located on the front side of the card insertion end compared to the extension portion 412. The fitting main body 421 in front of the deformation opening 422 is formed with a limiting portion 425 for limiting the free end portion 4114. The limiting portion 425 includes an extension hole 4251 extending through the fitting main 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 clamping the upper and lower sides of the card limiting portion 4115. The upper limiting beam 4252 and the lower limiting beam 4253 are arranged in a staggered manner in the vertical direction, so that after the second terminal group 41 is injection molded, only one face of the card limiting portion 4115 of the second terminal group 41 is formed on the lower surface of the upper limiting beam 4252 and the upper surface of the lower limiting beam 4253. After the contact portion 4111 of the elastic arm 411 is pressed by the TF card, the card limiting portion 4115 can easily separate from the combined surface of the upper limiting beam 4252 and the lower limiting beam 4253, so that the free end portion 4114 becomes a movable free end. The width of the card limiting portion 4115 is smaller than the width of the free end portion 4114, so that the free end portion 4114 is always located in the extension hole 4251 and cannot move backward from the extension hole 4251. The free end portion 4114 can move freely in the extension hole 4251. The limiting step 4254 is arranged so 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 cannot enter the accommodation space downward.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Please continue reading Figures 11 to 16As shown, the card holder 20 of the present application comprises a partition plate 21 and a plastic body 22 formed around the partition plate 21. The partition plate 21 comprises a partition plate body 211, a through hole 214 formed in the front end of the partition plate body 211, and a notch 213 formed in the lateral outer side of the rear end of the partition plate body 211. The outer peripheral portion 212 of the partition plate body 211 is formed to be embedded in the plastic body 22. The plastic body 22 comprises a pair of longitudinal arms 221 formed on the lateral outer peripheral portions 212 of the partition plate body 211, a tail arm 222 formed on the rear outer peripheral portion 212 of the partition plate body 211, a front end portion 223 formed on the front outer peripheral portion 212 of the partition plate body 211, and a cover portion 224 formed in the front end of the front end portion 223. The upper side of the partition plate body 211 and the plastic body 22 form a first card accommodating space S1 (TF card), and the lower side of the partition plate body 211 and the plastic body 22 form second and third card accommodating spaces S2, S3 (SIM cards) arranged longitudinally. A partition column 225 is formed between the second and third card accommodating spaces S2, S3.

[0048] The lateral outer side of the longitudinal arm 221 is provided with a clamping groove 2213 for clamping the elastic piece 321 of the shielding shell 30. The upper surface of the longitudinal arm 221 is provided with a limiting groove 2211 formed in the lateral outer side, and a limiting wall 2212 is formed in the front end of the limiting groove 2211 at the front end portion 223. A limiting notch 2214 is formed in the rear end of the longitudinal arm 221 corresponding to the position of the limiting hook 325 of the shielding shell 30, and the limiting hook 325 is clamped into the limiting notch 2214 to prevent excessive insertion of the card holder 20. The limiting wall 33 of the front plate portion 312 of the shielding shell 30 slides on the limiting groove 2211 and is limited on the limiting wall 2212 of the card holder 20 to prevent the card holder 20 from being continuously inserted. The limiting wall 33 further comprises a pressing portion 332 formed by vertically bending outward from the lower end of the limiting wall 33, and the pressing portion 332 is pressed into the limiting groove 2211. The welding portion 331 is formed by vertically bending downward from the pressing portion 332.

[0049] The stacked card holder of the present application is clamped by the limiting wall 33 of the lateral sides of the shielding shell 30 on the limiting wall 2212 of the front end of the limiting groove 2211 of the card holder, and the limiting hook 325 is arranged on the rear end of the side wall 32 of the shielding shell 30 to extend into the accommodating space, and the limiting notch 2214 is arranged on the rear end of the longitudinal wall 221 of the card holder 20 to cooperate with the limiting hook 325, thereby achieving double clamping to prevent excessive insertion.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] With reference to Figure 13 、 Figure 17 、 Figure 18 As shown in the drawings, the bottom of the longitudinal arm 221 of the card holder 20 is downwardly protruded to form a support strip 2215 which is directly supported to slide on the printed circuit board 10, and the upper portion of the card holder 20 is limited below the top wall 31 of the shielding shell 30, mainly by the limiting wall 33 abutting in the limiting groove 2211 on the upper side of the longitudinal arm 221 of the card holder 20 to limit downwardly, so that it is not necessary to form a holding structure on the side wall 32 of the shielding shell 30 to hold the card holder 20, further reducing the thickness of the product.

[0054] The support strip 2215 is wide at the top and narrow at the bottom, reducing the contact sliding area of the support strip 2215 with the printed circuit board 10, avoiding excessive occupation of the space of the printed circuit board 10, and also avoiding the problem of excessive contact area causing excessive friction to damage the printed circuit board 10.

[0055] The stacked card holder of the present application forms a support strip 2215 on the bottom of the longitudinal arm 221 of the card holder 20 to directly slide and contact on the printed circuit board 10, and the upper and lower limiting of the card holder 20 is achieved by the shielding shell 30 pressing from above and supporting the printed circuit board 10 from below, which can avoid the technical problem of thickening the card holder caused by the need to inwardly bend the side wall 32 of the shielding shell 30 to hold the card holder 20 in the prior art.

[0056] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A stacked card holder, comprising a first terminal module, a shielding shell covering the first terminal module, a second terminal module formed on the shielding shell and arranged opposite to the first terminal module, a receiving space formed between the first terminal module and the second terminal module, and a card holder that can be plugged and unplugged in the receiving space, the shielding shell comprising a top wall and side walls bent downwardly from both sides of the top wall, the second terminal module comprising a second terminal group and a second insulator that fixes the second terminal group on the top wall, characterized in that Each conductive terminal of the second terminal group includes an elastic arm extending downward into the receiving space, an extension portion extending backward from the elastic arm, and a solder foot bent downward and extended from the extension portion. The front end of the elastic arm is formed with a free end portion located on the card insertion end side. The second insulator is provided with an extension hole at the position of the free end portion. The free end portion is limited to deform and move within the extension hole. The top wall of the shielding shell and the second insulator are respectively provided with windows and deformation openings at the positions of the elastic arms of the second terminal group to allow the elastic arms to deform elastically. The elastic arm includes a contact portion extending into the receiving space, a second and a first elastic arm respectively extending obliquely upward from the front and rear ends of the contact portion. A locking portion is formed between the second elastic arm and the free end portion. A limiting portion is provided at the front end of the deformation opening. An upper limit beam and a lower limit beam are respectively formed on the upper and lower sides of the locking portion on the side of the limiting portion close to the deformation opening. The upper limit beam and the lower limit beam are staggered in the longitudinal direction. The card holder includes a partition plate and a plastic body molded on the outer periphery of the partition plate.

2. The stackable card holder according to claim 1, wherein: The extension portion is formed by extending backward from the first elastic arm located at the rear side, and the free end portion is formed by bending and extending horizontally from the front end of the second elastic arm.

3. The stackable card holder according to claim 2, wherein: The width of the locking portion is smaller than the width of the free end portion.

4. The stackable card holder according to claim 3, wherein: The stretching hole is formed by passing through the limiting portion up and down.

5. The stackable card holder according to claim 4, wherein: The projections of the upper limit beam and the lower limit beam in the vertical direction do not overlap, the lower limit beam is close to the deformation opening, and the upper limit beam is close to the extension hole.

6. The stackable card holder according to claim 4, wherein: The limiting portion protrudes downward at the front end of the extension hole to form a limiting step; the second insulator includes a fitting body provided with the deformation opening and a rear wall extending downward from the rear end of the fitting body, the welding foot extends downward from the rear wall and is exposed at the bottom surface of the rear wall, and the fitting body and the top wall are formed as one body.

7. The stackable card holder according to claim 4, wherein: The plastic body includes longitudinal arms formed on both sides of the partition plate, a tail arm formed at the rear end of the partition plate, a front end portion formed at the front end of the partition plate, and a cover portion formed in front of 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 storage space corresponding to the second terminal module. The longitudinal arm, the tail arm and the front end portion are arranged on the lower surface of the partition plate to form second and third card storage spaces arranged in the longitudinal direction and corresponding to the first terminal module. An ultra-high-speed TF card is inserted in the first card storage space. When the card tray is inserted, the ultra-high-speed TF card presses the contact portion upward from the free end side of the elastic arm.

8. The stackable card holder according to claim 7, wherein: The front end portion includes first and third clamping portions that protrude rearward and extend into the first and third card accommodating spaces, and the longitudinal arm is located at the second card accommodating space and is provided with a second clamping portion that protrudes into the second card accommodating space.

9. The stackable card holder according to claim 7, wherein: The first terminal module is directly welded on a printed circuit board, the side wall of the shielding shell is welded on the printed circuit board, and the bottom of the longitudinal arm protrudes downward to form a support bar that is wide at the top and narrow at the bottom, and the support bar is supported on the printed circuit board.

10. The stackable card holder according to claim 9, wherein: A limiting groove is provided on the outer side of the upper surface of the longitudinal arm, and the limiting groove forms a limiting step at the front end position. The top wall includes a main plate portion and a front plate portion located at the front end of the main plate portion. The side walls are formed by bending from the lateral sides of the main plate portion, and the lateral sides of the front plate portion are bent downward to form limiting walls that support and limit the limiting step. The width between a pair of limiting walls is smaller than the width between a pair of side walls, and the lower end of the limiting wall is bent vertically outward and extended to form a pressing portion pressed on the upper surface of the limiting groove.

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