Card Substrate for Carrying Chip Module and Its Smart Card

Abstract

The present invention provides a card substrate for carrying a chip module. The card substrate has opposite first and second surfaces, and a recessed portion for accommodating the chip module that is recessed from the first surface toward the second surface. The recessed portion includes a first recessed portion and a second recessed portion that is further recessed from the bottom wall of the first recessed portion. In the left-right direction, the size of the second recessed portion gradually narrows from the middle toward both sides. In the up-down direction, the size of the second recessed portion also gradually narrows from the middle toward both sides. The first angle formed by the line connecting the right endpoint and the upper endpoint of the contour of the second recessed portion and the line connecting the right endpoint and the lower endpoint of the contour of the second recessed portion is between 50 degrees and 80 degrees. The second angle formed by the line connecting the left endpoint and the upper endpoint of the contour of the second recessed portion and the line connecting the left endpoint and the lower endpoint of the contour of the second recessed portion is also between 50 degrees and 80 degrees.

Description

Technical Field

[0001] The present invention relates to the field of smart cards, and in particular to a card substrate for carrying a chip module and a smart card having the card substrate. Background Art

[0002] Smart cards, also known as IC cards, intelligent cards, microcircuit cards, microchip module cards, etc., are widely used in payment cards, SIM cards, transportation cards, credit cards, etc. due to their small size, portability, large storage capacity, high reliability, long service life, strong confidentiality, high security, etc. The communication method between the smart card and the reader can be either contact type or non-contact type. When a contact smart card is used, the integrated circuit of the card is directly connected to the external interface circuit through tangible metal electrode contacts to provide power for the integrated circuit to work and perform data exchange. Since the chip module of a non-contact smart card is electrically connected to the induction antenna inside the smart card through a conductive material such as solder paste, when in use, it only needs to be close to the card reading device, and data can be read through radio wave induction with the card reading device from a distance.

[0003] Whether it is a contact smart card or a non-contact smart card, it includes a card substrate and a chip module housed in the card substrate, and after being manufactured, it often needs to be subjected to a reliability test through a three-roller tester (i.e., using three rollers to squeeze the chip module to simulate reading devices such as bank deposit and withdrawal machines). However, some existing types of chip modules are relatively thin and soft, and during the three-roller test, the chip module is easily damaged and fails to pass the reliability test. Summary of the Invention

[0004] In view of this, the present invention aims to provide a card substrate for a chip module and a smart card having the card substrate that can solve or at least alleviate the above problems.

[0005] On the one hand, the present invention provides a card substrate for carrying a chip module, the card substrate having a first surface and a second surface relative to each other, and a recessed portion recessed from the first surface toward the second surface for accommodating the chip module, the recessed portion comprising a first recessed portion recessed from the first surface toward the second surface, and a second recessed portion further recessed from the bottom wall of the first recessed portion toward the second surface, in the left-right direction, the size of the second recessed portion gradually narrows from the middle to both sides, in the up-down direction, the size of the second recessed portion gradually narrows from the middle to both sides, a first angle formed by a line between a right end point and an upper end point of the contour of the second recessed portion and a line between a right end point and a lower end point of the contour of the second recessed portion is between 50 degrees and 80 degrees, and a second angle formed by a line between a left end point and an upper end point of the contour of the second recessed portion and a line between a left end point and a lower end point of the contour of the second recessed portion is also between 50 degrees and 80 degrees.

[0006] Preferably, a line connecting the upper endpoint and the left endpoint of the contour of the second recessed portion and a line connecting the upper endpoint and the right endpoint of the contour of the second recessed portion form a third angle, and the third angle is between 100 degrees and 130 degrees.

[0007] Preferably, the ratio of the distance between the left and right end points of the contour of the second recessed portion to the distance between the upper and lower end points of the contour of the second recessed portion is between 1.2 and 2.5.

[0008] Preferably, the profile of the second recessed portion includes two curved sections arranged along the left-right direction and connected to each other, each curved section includes a first arc-shaped section approximately located in the middle, and two second arc-shaped sections respectively connected to both ends of the first arc-shaped section.

[0009] Preferably, a central angle corresponding to the first arc-shaped section is between 81 degrees and 134 degrees, and a radius corresponding to the first arc-shaped section is between 0.4 mm and 1 mm.

[0010] Preferably, a central angle corresponding to the second arc-shaped section is between 16 degrees and 40 degrees, and a radius corresponding to the second arc-shaped section is between 3 mm and 7 mm.

[0011] Preferably, the curved section further comprises two straight sections respectively connected to one end of the two second circular arc sections away from the first circular arc section.

[0012] Preferably, the distance between the left and right endpoints of the contour of the second recessed portion is between 2.5 mm and 7.5 mm, and the distance between the upper and lower endpoints of the contour of the second recessed portion is between 2.5 mm and 5 mm.

[0013] Preferably, the contour of the second recess includes two curved sections arranged in the left - right direction and connected to each other. The two curved sections jointly enclose a quadrilateral. Each curved section includes two straight sections, and the contour further includes an arc - shaped connecting section for connecting two adjacent straight sections.

[0014] On the other hand, the present invention provides an intelligent card, which includes the above - mentioned card substrate and a chip module accommodated in the recess of the card substrate.

[0015] The contour of the second recess in the present invention is similar to two opposite triangles. After the chip module is assembled to the card substrate provided by the present invention, it can provide good support and protection for the chip. Even when performing the three - roller test, the chip will not absorb too much vibration and extrusion, which helps to improve the passing rate of the reliability test of the chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Further features of the present invention will become more apparent from the following description of the preferred embodiments, which are provided by way of example only in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 is a perspective schematic view of the intelligent card of the present invention performing a three - roller test;

[0018] Figure 2 is Figure 1 a perspective schematic view of the intelligent card shown from another angle when performing a three - roller test;

[0019] Figure 3 is Figure 1 a cross - sectional view of the intelligent card shown when performing a three - roller test;

[0020] Figure 4 is a plan view of the first embodiment of the intelligent card of the present invention;

[0021] Figure 5 is Figure 4 a partial cross - sectional view of the intelligent card shown;

[0022] Figure 6 is Figure 4 a partial cross - sectional view of the card substrate of the intelligent card shown;

[0023] Figure 7A is Figure 4 a partial top view of the card substrate of the intelligent card shown, where the parameters of relevant angles are marked;

[0024] Figure 7B is Figure 4 a partial top view of the card substrate of the intelligent card shown, where the parameters of relevant distances are marked;

[0025] Figure 8 is a partial cross-sectional view of the card substrate of the second embodiment of the smart card of the present invention;

[0026] Figure 9 is a partial top view of the card substrate of the third embodiment of the smart card of the present invention;

[0027] Figure 10 is a partial top view of the card substrate of the fourth embodiment of the smart card of the present invention. Detailed Embodiments

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments so that the technical solutions and their beneficial effects of the present invention are clearer. It can be understood that the accompanying drawings are only for reference and illustration, and are not used to limit the present invention. The dimensions shown in the drawings are only for clear description and do not limit the proportional relationship.

[0029] Refer to Figures 1 to 3 , the smart card of the present invention includes a rectangular card substrate 10 and a chip module 20 accommodated in the card substrate 10. When the smart card of the present invention is manufactured and undergoes a three-roller test, one roller 30 presses on the surface of the chip module 20, and the other two rollers 30 press on a surface of the card substrate 10 opposite to the chip module 20 at intervals. During the test, each roller 30 reciprocally rolls along the length direction of the card substrate 10 to simulate a reading device such as an ATM, thereby performing a reliability test on the chip module 20. In other words, the rolling direction of each roller 30 is the same as the direction of inserting the smart card into or taking out the smart card from the ATM. It should be noted that the smart card of the present invention can adopt either a contact communication method or a non-contact communication method. When adopting the contact communication method, the metal layer for directly contacting the external interface circuit of the chip module 20 is formed on the outer surface of the chip module 20 and is preferably flush with the surface of the card substrate 10.

[0030] Refer to Figures 4 to 6 , the card substrate 10 of the smart card of the first embodiment of the present invention has opposite first surface 11 and second surface 12, and a recess 13 for accommodating the chip module 20 that is recessed from the first surface 11 towards the second surface 12. The recess 13 includes a first recess 14 that is recessed from the first surface 11 of the card substrate 10 towards the second surface 12 of the card substrate 10, and a second recess 15 that is further recessed from the bottom wall of the first recess 14 towards the second surface 12 of the card substrate 10. The first recess 14 is used to accommodate the substrate 21 of the chip module 20, and the second recess 15 is used to accommodate the chip 22 of the chip module 20, where the substrate 21 of the chip module 20 is electrically connected to the chip 22.

[0031] The smart card in this embodiment can be implemented for non-contact reading. On the card substrate 10, two third recesses 16 are further formed that recess further from the bottom wall of the first recess 14 towards the second surface 12 of the card substrate 10. The two third recesses 16 are respectively located at both ends of the second recess 15 along the insertion direction of the smart card. Conductive materials 160, such as solder paste, are accommodated in both of the two third recesses 16 for respectively connecting the positive and negative power supplies of the chip module 20 and an antenna (not shown) arranged in the card substrate 10.

[0032] Taking Figure 7A and 7B as a reference, the insertion direction of the smart card is defined as the left-right direction X, and the direction perpendicular to the insertion direction of the smart card is defined as the up-down direction Y. In the left-right direction X, the size of the second recess 15 of the card substrate 10 of the smart card of the present invention gradually narrows from the middle to both sides. In the up-down direction Y, the size of the second recess 15 of the card substrate 10 of the smart card of the present invention also gradually narrows from the middle to both sides. The included angle formed by the connection line between the right endpoint and the upper endpoint of the contour of the second recess 15 and the connection line between the right endpoint and the lower endpoint of the contour of the second recess 15 is between 50 degrees and 80 degrees for R3. Similarly, the included angle formed by the connection line between the left endpoint and the upper endpoint of the contour of the second recess 15 and the connection line between the left endpoint and the lower endpoint of the contour of the second recess 15 is also between 50 degrees and 80 degrees.

[0033] Assume that the included angle formed by the connection line between the upper endpoint and the left endpoint of the contour of the second recess 15 and the connection line between the upper endpoint and the right endpoint of the contour of the second recess 15 is R4. Preferably, the included angle R4 is between 100 degrees and 130 degrees. Similarly, the included angle formed by the connection line between the lower endpoint and the left endpoint of the contour of the second recess 15 and the connection line between the lower endpoint and the right endpoint of the contour of the second recess 15 is also between 100 degrees and 130 degrees.

[0034] Preferably, the ratio of the distance M3 between the left and right endpoints of the contour of the second recess 15 to the distance M1 between the upper and lower endpoints is between 1.2 and 2.5. The distance M3 between the left and right endpoints of the contour of the second recess 15 is between 2.5 mm and 7.5 mm. The distance M1 between the upper and lower endpoints of the contour of the second recess 15 is between 2.5 mm and 5 mm.

[0035] The contour of the second recess 15 of the present invention is similar to two opposite triangles. After the chip module 20 is assembled into the card substrate 10 in this embodiment, it provides good support and protection for the chip. Even when the three-roller 30 test is performed, the chip will not absorb too much vibration and extrusion, which helps to improve the passing rate of the reliability test of the chip.

[0036] Specifically Figure 7A and 7B In the illustrated embodiment, the contour of the first recess 14 of the card substrate 10 is generally rectangular and includes four first straight sections 140 connected end to end. Preferably, the contour of the first recess 14 further includes an arcuate first connecting section 141 for connecting two adjacent first straight sections 140.

[0037] In this embodiment, the contour of the second recess 15 of the card substrate 10 is generally olive-shaped and includes two symmetrical and connected curved sections 150 arranged in the left-right direction X. The curved section 150 includes a first arcuate section 152 approximately located in the middle, two second arcuate sections 153 respectively connected to the two ends of the first arcuate section 152, and two second straight sections 154 respectively connected to the ends of the two second arcuate sections 153 remote from the first arcuate section 152. One second straight section 154 of each curved section 150 is connected to a corresponding second straight section 154 of the other curved section 150. In other embodiments, the two curved sections 150 may also be asymmetrical in the left-right direction X.

[0038] In this embodiment, the midpoints of the two first arcuate sections 152 are respectively the left and right end points of the contour of the second recess 15. Any point on the upper second straight section 154 is the upper end point of the contour of the second recess 15. Any point on the lower second straight section 154 is the lower end point of the contour of the second recess 15.

[0039] Preferably, the central angle R1 corresponding to the first arcuate section 152 is between 81 degrees and 134 degrees. The radius r1 of the first arcuate section 152 is between 0.4 mm and 1 mm. Preferably, the central angle R2 of the second arcuate section 153 is between 16 degrees and 40 degrees. The radius r2 of the second arcuate section 153 is between 3 mm and 7 mm.

[0040] As can be seen, the contour of the second recess 15 in this embodiment includes six arc-shaped sections (two first arc-shaped sections 152 and four second arc-shaped sections 153) and two straight sections (each straight section includes two second straight sections 154). It should be noted that the number and arrangement of the arc-shaped sections and straight sections in this embodiment are only shown as examples. In other embodiments, arc-shaped sections and straight sections with other numbers and arrangements can also be used. For example, in other embodiments, the contour of the second recess can be formed only by connecting multiple arc-shaped sections, or the above-mentioned first arc-shaped section 152 and second arc-shaped section 153 can be respectively composed of multiple arcs. Or, in some embodiments, the contour of the second recess can be composed of multiple arc-shaped sections and multiple straight sections, where the multiple arc-shaped sections can be connected in sequence, the multiple straight sections can be connected in sequence and then connected to both ends of the above-mentioned multiple arc-shaped sections connected in sequence. Or, the multiple arc-shaped sections and multiple straight sections can be arranged and connected at periodic intervals. Or, the multiple arc-shaped sections and multiple straight sections can be randomly connected and arranged without rules, as long as the finally formed second recess can play a good role in supporting and protecting the chip module with its specific shape.

[0041] Reference Figure 8 , the smart card of the second embodiment of the present invention is similar to the smart card of the first embodiment, and the same parts will not be described in detail here. The main difference between the smart card of the second embodiment and the smart card of the first embodiment is that the smart card in this embodiment is a contact smart card, and the recess 213 in the second embodiment no longer includes the aforementioned third recess 16.

[0042] Reference Figure 9 , the smart card of the third embodiment of the present invention is similar to the smart card of the first embodiment, and the same parts will not be described in detail here. The main difference between the smart card of the third embodiment and the smart card of the first embodiment is that the contour of the second recess is slightly different.

[0043] Specifically, the curved section 350 of the contour of the second recess 315 in this embodiment no longer includes the second straight section 154, but only includes a first arc-shaped section 352 approximately located in the middle, and two second arc-shaped sections 353 respectively connected to both ends of the first arc-shaped section 352. One second arc-shaped section 353 of each curved section 350 is directly connected to the corresponding second arc-shaped section 353 of another curved section 350. Preferably, the two curved sections 350 are symmetric in the left-right direction.

[0044] Preferably, the central angle R6 corresponding to the first arc-shaped section 352 is between 81 degrees and 134 degrees. The radius r3 corresponding to the first arc-shaped section 352 is between 0.4 mm and 1 mm. Preferably, the central angle R7 corresponding to the second arc-shaped section 353 is between 16 degrees and 40 degrees. The radius r4 corresponding to the second arc-shaped section 353 is between 3 mm and 7 mm. Two adjacent second arc-shaped sections 353 may be on the same circumference or on different circumferences. When two adjacent second arc-shaped sections 353 are on the same circumference, the two second arc-shaped sections 353 may also be combined and regarded as an arc section.

[0045] Reference Figure 10 , the smart card of the fourth embodiment of the present invention is similar to the smart card of the first embodiment, and the same parts will not be described in detail here. The main difference between the smart card of the fourth embodiment and the smart card of the first embodiment lies in the different contours of the second recess.

[0046] Specifically, the bending section 450 of the second recess 415 in this embodiment includes two third straight sections 451. The two bending sections 450 together enclose a generally diamond-shaped contour. The contour of the second recess 415 in this embodiment further includes an arc-shaped second connecting section 452 for connecting two adjacent third straight sections 451.

[0047] Preferably, a first included angle R8 is formed between the two third straight sections 451 of each bending section 450, and the first included angle R8 is between 50 degrees and 80 degrees. A second included angle R9 is formed between the adjacent third straight sections 451 of the two bending sections 450, and the second included angle R9 is between 100 degrees and 130 degrees. It can be understood that in other embodiments, the contour of the second recess 415 may not be diamond-shaped but a quadrilateral composed of two asymmetric triangles. For example, the two bending sections 450 may have different first included angles R8.

[0048] The above are only the preferred specific embodiments of the present invention, and the protection scope of the present invention is not limited to the above-listed embodiments. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope disclosed by the present invention all fall within the protection scope of the present invention.

Claims

1. A card substrate for carrying a chip module, the card substrate having opposite first and second surfaces, and a recess for receiving the chip module recessed from the first surface towards the second surface, the recess including a first recess recessed from the first surface towards the second surface and a second recess further recessed from the bottom wall of the first recess towards the second surface, characterized in that, In the left - right direction, the size of the second recess gradually narrows from the middle towards both sides. In the up - down direction, the size of the second recess also gradually narrows from the middle towards both sides. The first included angle formed by the line connecting the right - hand endpoint and the upper - hand endpoint of the contour of the second recess and the line connecting the right - hand endpoint and the lower - hand endpoint of the contour of the second recess is between 50 degrees and 80 degrees. The second included angle formed by the line connecting the left - hand endpoint and the upper - hand endpoint of the contour of the second recess and the line connecting the left - hand endpoint and the lower - hand endpoint of the contour of the second recess is also between 50 degrees and 80 degrees.

2. The card substrate for carrying a chip module according to claim 1, wherein The line connecting the upper - hand endpoint and the left - hand endpoint of the contour of the second recess and the line connecting the upper - hand endpoint and the right - hand endpoint of the contour of the second recess form a third included angle, and the third included angle is between 100 degrees and 130 degrees.

3. The card substrate for carrying a chip module according to claim 1, wherein The ratio of the distance between the left - hand and right - hand endpoints of the contour of the second recess to the distance between the upper - hand and lower - hand endpoints of the contour of the second recess is between 1.2 and 2.

5.

4. The card substrate for carrying a chip module according to claim 1, characterized in that, The contour of the second recess includes two curved sections arranged in the left - right direction and connected to each other. Each curved section includes a first circular - arc section located approximately in the middle, and two second circular - arc sections respectively connected to the two ends of the first circular - arc section.

5. The card substrate for carrying a chip module according to claim 4, characterized in that, The central angle corresponding to the first circular - arc section is between 81 degrees and 134 degrees, and the radius corresponding to the first circular - arc section is between 0.4 mm and 1 mm.

6. The card substrate for carrying a chip module according to claim 4, wherein The central angle corresponding to the second circular - arc section is between 16 degrees and 40 degrees, and the radius corresponding to the second circular - arc section is between 3 mm and 7 mm.

7. The card substrate for carrying a chip module according to claim 4, wherein, The curved section further includes two straight sections respectively connected to the ends of the two second circular - arc sections far from the first circular - arc section.

8. The card substrate for carrying a chip module according to claim 7, wherein The distance between the left - hand and right - hand endpoints of the contour of the second recess is between 2.5 mm and 7.5 mm, and the distance between the upper - hand and lower - hand endpoints of the contour of the second recess is between 2.5 mm and 5 mm.

9. The card substrate for carrying a chip module according to claim 1, wherein The contour of the second recess includes two curved sections arranged in the left - right direction and connected to each other. The two curved sections together enclose a quadrilateral. Each curved section includes two straight sections, and the contour further includes an arc - shaped connecting section for connecting adjacent two straight sections.

10. An intelligent card, characterized in that, The smart card includes a card substrate according to any one of claims 1 - 9, and a chip module housed in the recess of the card substrate.

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