Device frame having mechanically bonded metal and plastic

• US 8,861,198 B1
• Filed: 03/27/2012
• Issued: 10/14/2014
• Est. Priority Date: 03/27/2012
• Status: Expired due to Fees

• Current Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Original Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Inventors: Asuncion, Bryan C.
• Primary Examiner(s): Edwards, Anthony Q
• Application Number:
  US13/431,820
• Time in Patent Office: 931 Days
• Field of Search: 361/679.3
• US Class Current: 361/679.55
• CPC Class Codes: G06F 1/1658 related to the mounting of internal components, e.g. disc drive or any other functional module

Abstract

A frame for a mobile device includes a metal region and a plastic region. The metal region has a plurality of sides, wherein at least one side of the plurality of sides comprises a plurality of voids. The plastic region comprises glass impregnated plastic and has a mechanical bond to the at least one side of the metal region, wherein the mechanical bond is achieved via protrusions of the plastic region that fill the plurality of voids in the at least one side.

Claims

1. A mobile device comprising:

a composite frame comprising;

a metal portion having a plurality of voids; and

a glass impregnated plastic portion having a plurality of protrusions that fill the plurality of voids to form a mechanical bond to the metal portion;

a back cover coupled to a back side of the composite frame; and

a display coupled to a front side of the composite frame, wherein the composite frame frames the display, wherein;

the metal portion comprises a plurality of parallel slots; and

the glass impregnated plastic portion comprises;

a plurality of receiving areas that receive hook features of a front cover; and

a plurality of ribs that provide rigidity to the glass impregnated plastic portion.

2. The mobile device of claim 1, further comprising a plurality of electronic components that are at least one of housed within, framed by, or coupled to the composite frame.

3. The mobile device of claim 1, further comprising:

an antenna that is covered by the glass impregnated plastic portion of the composite frame.

4. The mobile device of claim 1, wherein approximately 30% to approximately 70% of a volume of the glass impregnated plastic portion is composed of glass fibers.

5. The mobile device of claim 1, wherein the metal portion joins the glass impregnated plastic portion with a seamless joint.

6. The mobile device of claim 1, wherein the metal portion comprises at least one of magnesium or aluminum.

7. The mobile device of claim 1, wherein the metal portion has been formed via a die cast process and the glass impregnated plastic portion has been formed on the at least one side of the metal portion via a plastic injection molding process.

8. The mobile device of claim 1, wherein:

the plurality of parallel slots are spaced approximately 2 mm apart and have thicknesses of approximately 1 mm.

9. A frame for a mobile device, the frame comprising:

a metal region having a plurality of sides, wherein at least one side of the plurality of sides comprises a plurality of voids; and

a plastic region, comprising glass impregnated plastic, having a mechanical bond to the at least one side of the metal region, wherein the mechanical bond is achieved via protrusions of the plastic region that fill the plurality of voids in the at least one side, wherein;

the metal region comprises a plurality of parallel slots; and

the plastic region comprises;

a plurality of receiving areas that receive hook features of a front cover; and

a plurality of ribs that provide rigidity to the plastic region.

10. The frame of claim 9, wherein approximately 30% to approximately 70% of a volume of the plastic region is composed of glass fibers.

11. The frame of claim 9, wherein the plastic region is configured to cover an antenna.

12. The frame of claim 9, wherein the metal region joins the plastic region with a seamless joint, and wherein the metal region has a hollow center.

13. The frame of claim 9, wherein the metal region comprises at least one of magnesium or aluminum.

14. The frame of claim 9, wherein the metal region has been formed via a die casting process and the plastic region has been formed on the at least one side of the metal region via a plastic injection molding process.

15. The frame of claim 9, wherein

the plurality of parallel slots are spaced approximately 2 mm apart and have thicknesses of approximately 1 mm.

16. A process of manufacturing a composite frame for a mobile device, the process comprising:

forming a metal portion of the composite frame, wherein the metal portion has a plurality of voids at an end of the metal portion, wherein the metal portion comprises a plurality of parallel slots;

forming a glass impregnated plastic portion of the composite frame on the end of the metal portion via a plastic injection molding process, wherein the glass impregnated plastic portion has a plurality of protrusions that fill the plurality of voids to form a joint to the metal portion, and wherein the glass impregnated plastic portion comprises a plurality of receiving areas that receive hook features of a front cover and a plurality of ribs that provide rigidity to the glass impregnated plastic portion;

correcting imperfections produced by the plastic injection molding process; and

polishing the glass impregnated plastic portion, wherein after the polishing the joint between the metal portion and the glass impregnated plastic portion is approximately seamless.

17. The process of claim 16, further comprising

painting the composite frame, wherein the metal portion and the glass impregnated plastic portion are visually indistinguishable.

18. The process of claim 16, wherein forming the glass impregnated plastic portion comprises:

placing the metal portion into an insert molding machine;

injecting liquid plastic into the insert molding machine, wherein the liquid plastic flows into the voids; and

cooling the metal portion and the glass impregnated plastic portion before removing the composite frame from the insert molding machine.

19. The process of claim 16, wherein approximately 30% to approximately 70% of a volume of the glass impregnated plastic portion is composed of glass fibers.

20. The process of claim 16, wherein the metal portion comprises at least one of magnesium or aluminum, and wherein the metal portion is formed using a metal die casting process.