Micro-SD to secure digital adaptor card and manufacturing method

• US 8,102,658 B2
• Filed: 12/29/2009
• Issued: 01/24/2012
• Est. Priority Date: 07/05/2007
• Status: Expired due to Fees

• Current Assignee: Super Talent Technology, Corporation
• Original Assignee: Super Talent Electronics, Inc.
• Inventors: Hiew, Siew S., Ma, Abraham C., Nan, Nan
• Primary Examiner(s): LEVI, DAMEON E
• Application Number:
  US12/649,233
• Publication Number:
  US 20100105251A1
• Time in Patent Office: 756 Days
• Field of Search: 361/737, 361/752, 439/630, 439/945, 439/946, 235/492, 298/30, 257/679
• US Class Current: 361/737
• CPC Class Codes: G06F 1/1632 External expansion units, e.g. docking stations
• CPC Class Codes: H05K 1/117 Pads along the edge of rigid circuit boards, e.g. for pluggable connectors
• CPC Class Codes: H05K 3/202 using self-supporting metal foil pattern
• CPC Class Codes: H05K 3/4092 Integral conductive tabs, i.e. conductive parts partly detached from the substrate
• CPC Class Codes: H05K 5/0282 Adapters for connecting cards having a first standard in receptacles having a second standard
• CPC Class Codes: Y10S 439/945 Adapter for pcb or cartridge
• CPC Class Codes: Y10S 439/946 Memory card cartridge
• CPC Class Codes: Y10T 29/49126 Assembling bases

Abstract

A microSD-to-SD adaptor card includes a base substrate having a lead frame structure, a protective cap forming a chamber that encloses eight microSD contact pins of the lead frame structure, and a thermoset plastic casing formed over the protective cap and exposed portions of the base substrate to provide the adaptor card with standard SD card dimensions. A rear opening facilitates insertion of a standard microSD card, whereby the eight contact pads on the microSD card are contacted by the eight microSD contact pins inside the chamber to allow electrical signals generated by the microSD card to be transmitted to a host system by way of a standard SD socket. A grip anchor pin is disposed inside the chamber to engage a grip notch disposed on the microSD card. A pre-molded switch slot is provided on the molded plastic casing, and an insert-in write protect switch is mounted after molding.

Claims

1. An adaptor card for adapting a micro-Secure Digital (microSD) card to communicate with a standard Secure Digital (SD) socket disposed on a host system, the adapter card comprising:

a substrate forming a lower wall of the adaptor card, the substrate including a planar outside surface and an opposing inside surface, a front edge and an opposing rear edge;

a lead frame structure fixedly connected to the inside surface of the substrate, the lead frame structure including;

nine SD contact pads disposed on the substrate and located adjacent to the front edge of the substrate, the nine SD contact pads having respective contact surfaces facing away from the substrate and arranged in a standard SD pattern,

eight microSD contact pins supported over the inside surface of the substrate and extending toward the rear edge of the substrate; and

a plurality of connector wires respectively electrically connecting each of the eight microSD contact pins and an associated one of the nine SD contact pads;

a protective cap mounted on the inside surface of the substrate, the protective cap including opposing side walls extending from the inside surface, and an upper wall supported by the side walls and disposed parallel to and spaced from a portion of the inside surface such that the opposing side walls, the upper wall and the inside surface portion define a chamber; and

an integral molded plastic casing consisting essentially of a thermoset plastic and including an upper wall formed on the inside surface of the substrate and over the upper wall of the protective cap such that the protective cap is secured to said substrate by said thermoset plastic,

wherein said upper wall of the molded plastic casing defines a plurality of openings disposed such that each of said nine SD contact pads is exposed through an associated one of the plurality of openings,

wherein a rear edge of the integral molded plastic casing defines a rear opening, and

wherein the eight microSD contact pins are disposed inside the chamber such that, when the microSD card is fully inserted through the rear opening into the chamber, eight contact pads on the microSD card are operably respectively connected to the eight microSD contact pins, whereby electrical signals generated by the microSD card on any of the eight contact pads are transmitted corresponding ones of the nine SD contact pads.

2. The adaptor card according to claim 1,

wherein the protective cap consists essentially of a material having a first melting point temperature, and

wherein said thermoset plastic forming the molded plastic casing has a second melting point temperature that is higher than the first melting point temperature.

3. The adaptor card according to claim 1, wherein both the protective cap and the molded plastic casing consist essentially of an identical thermoset plastic.

4. The adaptor card according to claim 1,

wherein the lead frame structure further comprises a grip anchor pin supported over the inside surface of the substrate and extending toward the rear edge of the substrate, and

wherein the grip anchor pin is disposed inside the chamber such that, when the microSD card is fully inserted through the rear opening into the chamber, the grip anchor pin engages a grip notch disposed on a side edge of the microSD card such that the microSD card is secured inside the chamber.

5. The memory card device according to claim 1, wherein the molded plastic casing further includes a plurality of ribs, each rib being disposed between a corresponding adjacent pair of said openings.

6. The adaptor card according to claim 1, wherein the molded plastic casing and the substrate form a package having length, width and thickness dimensions consistent with an established SD standard.

7. The adaptor card according to claim 1,

wherein the molded plastic casing includes a pre-molded switch slot includes a cavity that is exposed by a first opening defined between first and second portions of said second side wall and a second opening defined in a portion of the upper wall;

and a write protect switch assembly mounted onto the molded plastic casing, the write protect switch assembly including;

a movable switch button having a base portion movably engaged in the cavity of the pre-molded switch slot, and a button top extending through the first opening; and

a switch cap secured to the upper wall of the molded plastic casing and having a flat wall portion of the switch cap encloses the second opening such that the base portion of the movable switch button is covered by the flat wall portion.

8. The memory card device according to claim 7,

wherein the pre-molded switch slot further comprises a retention wall extending between the first and second portions of said second side wall, and

wherein the movable switch button further defines a retaining slot and is mounted on the molded plastic casing such that the retention wall is slidably received inside the retaining slot.

9. The memory card device according to claim 7, wherein the retention wall is slidably received inside the retaining slot such that the movable switch button is restricted by the retaining wall to move between the first and second portions of said second side wall.

10. The memory card device according to claim 7,

wherein the pre-molded switch slot further defines a support shelf disposed around an edge of said cavity, and a plurality of retention openings that extend downward into the support shelf,

wherein the switch cap is mounted on the lower wall of the molded plastic casing such that the flat wall portion is disposed on the support shelf, and

wherein the switch cap further comprises a plurality of protrusions, each of the plurality of protrusions being inserted into an associated one of the plurality of retention openings.

11. The memory card device according to claim 10, wherein the switch cap comprises molded plastic and the plurality of protrusions comprise poles.

12. A method for producing an adaptor card for adapting a microSD card to communicate with an SD socket of a host system, the method comprising:

forming an assembly including;

a substrate having a planar outside surface and an opposing inside surface, a front edge and an opposing rear edge; and

a lead frame structure fixedly connected to the inside surface of the substrate, the lead frame structure including;

a plurality of standard Secure Digital (SD) contact pads disposed adjacent to the front edge of the substrate on the substrate and having respective contact surfaces facing away from the substrate,

a plurality of micro-Secure Digital (microSD) contact pins supported over the inside surface of the substrate and extending toward the rear edge of the substrate;

a plurality of connector wires respectively electrically connecting each of the plurality of microSD contact pins and an associated one of the plurality of standard SD contact pads; and

a grip anchor pin supported over the inside surface of the substrate and extending toward the rear edge of the substrate,

mounting a protective cap on the assembly such that opposing side walls and an upper wall of the protective cap define an chamber enclosing the eight microSD contact pins and the grip anchor pin; and

molding thermoset plastic on the inside surface of the substrate, the protective cap, and at least a portion of the lead frame structure to form an integral molded plastic casing arranged such that said protective cap is secured to said substrate by said thermoset plastic and the nine SD contact pads are exposed through openings defined in the molded plastic casing, wherein the protective cap prevents formation of said thermoset plastic in the chamber enclosing the eight microSD contact pins and the grip anchor pin.

13. The method according to claim 12, wherein forming the assembly comprises:

molding a plastic block onto the lead frame structure;

securing the plastic block to the inside surface of the substrate.

14. The method according to claim 13, wherein securing the plastic block to the inside surface of the substrate:

dispensing an adhesive onto the inside surface of the substrate; and

mounting the plastic block onto the adhesive.

15. The method according to claim 12, wherein mounting the protective cap comprises:

dispensing an adhesive onto the inside surface of the substrate; and

mounting the plastic block onto the adhesive.

16. The method according to claim 12,

wherein the substrate is disposed on a panel and is integrally connected to a second substrate;

wherein the method further comprises, after forming the integral molded plastic casing, singulating the panel to separate the substrate from the second substrate.

17. The method according to claim 16,

wherein dispensing said adhesive onto the inside surface of the substrate further includes dispensing said adhesive onto an insides surface of the second substrate,

wherein mounting the plastic block onto the adhesive comprises mounting an elongated plastic block over both the substrate and the second substrate, and

wherein singulating the panel comprises cutting the elongated plastic block into two plastic block portions, each plastic block portion being disposed on an associated one of the substrate and the second substrate.

18. The method according to claim 12, further comprising cutting a finger nail access notch into a rear edge of the integral molded plastic casing.

19. The method according to claim 12,

wherein forming the integral molded plastic casing further comprising forming a pre-molded switch slot including a cavity that is exposed by a first opening defined between first and second portions of a second side wall of the integral molded plastic casing, and a second opening defined in a portion of an upper wall of the integral molded plastic casing, and

wherein the method further comprises installing a write protect switch assembly including mounting a movable switch button such that a base portion of the movable switch button is movably engaged in the cavity of the pre-molded switch slot, and a button top extends through the first opening, and securing a switch cap to the upper wall of the molded plastic casing such that a flat wall portion of the switch cap covers the flat wall portion and encloses the second opening of the pre-molded switch slot.

20. The method according to claim 19,

wherein the pre-molded switch slot further comprises a retention wall extending between the first and second portions of said second side wall, and

wherein mounting the movable switch button includes mounting the movable switch button such that a retention wall is slidably received inside a retaining slot disposed on the movable switch button.

21. The method according to claim 19,

wherein the pre-molded switch slot further defines a support shelf disposed around an edge of said cavity, and a plurality of retention openings that extend downward into the support shelf, and

wherein mounting the switch cap comprises mounting the switch cap on the lower wall of the molded plastic casing such that the flat wall portion is disposed on the support shelf, and such that a plurality of protrusions extending from the lower surface of the flat wall portion are respectively inserted into each of the plurality of retention openings.

22. The method according to claim 21, wherein the plurality of protrusions comprise poles, and wherein mounting the switch cap comprises inserting each of the poles into an associated one of the plurality of retention openings.