Compound parts

1. An electronic device, comprising:

a housing having a cavity defined by a retaining surface, the retaining surface having at least one retention feature; and

a radio frequency (RF) transparent window comprising a composite resin formed within the cavity and co-finished with the housing providing a seamlessly appearing transition between the RF transparent window and the housing, the RF transparent window configured to allow transmission of RF wavelengths to pass therethrough, the RF transparent window having at least one securing feature engaged with corresponding at least one retention feature securing the RF transparent window within the cavity, the composite resin comprising a plurality of discrete particles suspended within a resin base, wherein the particles increase an impact resistance of the composite resin compared to the resin base without the particles.

2. The electronic device of claim 1 , wherein the housing comprises at least one of metal, ceramic, glass, and carbon fiber.

3. The electronic device of claim 1 , wherein the particles comprise a ceramic material.

4. The electronic device of claim 1 , wherein the particles are nano-sized particles.

5. The electronic device of claim 1 , wherein the particles comprise rubberized particles.

6. The electronic device of claim 1 , wherein the particles are substantially evenly distributed within the composite resin.

7. The electronic device of claim 1 , wherein a concentration of particles is greater at areas of the composite resin proximate the retaining surface compared to remainder areas of the composite resin.

8. The electronic device of claim 1 , wherein a concentration of particles is lesser at areas of the composite resin proximate the retaining surface compared to remainder areas of the composite resin.

9. The electronic device of claim 1 , wherein the retention feature is a groove formed along the retaining surface.

10. The electronic device of claim 1 , wherein the composite resin is substantially resistant to physical deformation at temperatures up to about 130° C.

11. The electronic device of claim 1 , wherein the composite resin is resistant to discoloration when exposed to an electrolytic solution during a subsequent anodizing process.

12. The electronic device of claim 1 , wherein resin base is comprised of at least one of an acrylate-based resin, an anhydride-based resin, a cationic-based resin, and a thermosetting polymer.

13. A method for forming a housing for an electronic device, the method comprising:

forming a cavity within the housing, the cavity defined by a retaining surface having at least one retention feature;

molding a composite resin while in an uncured state within the cavity, wherein during the molding at least one securing feature of the composite resin forms within corresponding at least one retention feature, wherein the composite resin comprises a plurality of discrete particles suspended within a resin base; and

forming a radio frequency (RF) transparent window by curing the composite resin within the cavity such that the at least one securing feature engages with the retention feature securing the RF transparent window within the cavity, wherein the RF transparent window allows transmission of RF wavelengths to pass therethrough, and wherein the particles increase an impact resistance of the RF transparent window compared to the cured resin base alone; and

co-finishing the housing with the RF transparent window such that an interface between the housing and the RF transparent window is substantially seamless in appearance.

14. The method of claim 13 , further comprising:

prior to molding the composite resin, selecting materials for the composite resin.

15. The method of claim 14 , where the selecting comprises:

determining a temperature resistance of a group of proposed materials for the resin base once the proposed materials are cured; and

selecting a material for the resin base with a high temperature resistance to physical deformation.

16. The method of claim 15 , wherein the resin base is substantially resistant to physical deformation at temperatures up to about 130° C.

17. The method of claim 14 , where the selecting comprises:

determining an optical opacity of a cured form of a group of proposed material for the resin base;

determining an optical opacity of a group of proposed particle materials; and

selecting a resin base material and a particle material based on the determination.

18. A method for forming a housing for a consumer electronic product, the housing having a cavity defined by a retaining surface, the retaining surface having at least one retention feature, method comprising:

injecting an uncured composite resin within the cavity, wherein during the forming at least one securing feature of the composite resin forms within corresponding at least one retention feature of the retention surface, wherein the uncured composite resin comprises a plurality of particles suspended within a resin base;

forming a radio frequency (RF) transparent window by curing the composite resin within the cavity such that the at least one securing feature engages with the retention feature securing the RF transparent window within the cavity, wherein the RF transparent window allows transmission of radio frequency (RF) wavelengths to pass therethrough, and wherein the particles increase an impact resistance of the RF transparent window compared to the cured resin base alone; and

co-finishing the housing and the RF transparent window forming a seamlessly appearing transition between the housing and the RF transparent window.

19. The method of claim 18 , wherein co-finishing the housing and the RF transparent window comprises mechanical finishing an outer surface of the housing and an outer surface of the RF transparent window in a single finishing operation.

20. The method of claim 19 , wherein the mechanical finishing comprises at least one of milling, drilling, sand blasting, and bead blasting surfaces of the RF transparent window and the housing.

21. The method of claim 18 , wherein co-finishing the housing and the RF transparent window comprises:

passivation of the housing and the RF transparent window.

22. The method of claim 21 , wherein passivation comprises an anodizing process.

23. The method of claim 22 , wherein the anodizing process includes applying an anodizing chemistry to surfaces of the housing and the RF transparent window to promote growth of a thin oxide passivation layer on surfaces the housing, wherein the RF transparent window retains an original color before and after the anodizing.