Frame structure for cellular telephones

• US 6,058,293 A
• Filed: 09/12/1997
• Issued: 05/02/2000
• Est. Priority Date: 09/12/1997
• Status: Expired due to Term

• Current Assignee: Optis Cellular Technology LLC (Brevet Capital)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Phillips, John C.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Fuller, Greta J.
• Application Number:
  US08/928,195
• Time in Patent Office: 963 Days
• Field of Search: 455/90, 455/550, 455/575, 455/95, 455/100, 455/128, 455/FOR 347, 455/FOR 349, 455/FOR 351, 455/348, 455/300, 455/301, 455/361, 455/349, 379/433, 379/434, 361/681, 361/682, 361/814, 361/829, 361/737, 361/752, 361/757, 361/818, D14/137, D14/138, 174/35 R, 174/35 GC, 235/492
• US Class Current: 455/575.1
• CPC Class Codes: H04B 1/034 Portable transmitters
• CPC Class Codes: H04M 1/0202 Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets constructional features of telephone transmitters or receivers, e.g. of speakers or microphones H04M1/03

Abstract

A cellular telephone incorporating a structural frame member having a side wall and a web, where each of these structural elements are made up of different materials. Through selection of side wall and web materials, an overall frame structure having a significantly reduced web thickness, as compared to conventional cellular telephones, can be obtained. This reduction in web thickness ultimately translates to a reduction in overall phone unit thickness, thus allowing for the production of a smaller, more compact cellular telephone.

Claims

1. A cellular telephone comprising:

a housing structure;

a frame disposed adjacent the housing structure and including a pair of side walls and a web fixedly secured to and extending between the side walls to form a unitary structural frame and wherein the side walls and web are constructed of different materials.

2. The cellular telephone of claim 1 wherein the side walls and web are formed through an insert molded die-cast process.

3. The cellular telephone of claim 1 wherein the side walls are formed of magnesium and the web comprises a sheet of steel that extends between the magnesium side walls.

4. The cellular telephone of claim 1 wherein the web is of a thickness of 0.5 millimeters or less.

5. The cellular telephone of claim 4 wherein the web is of a thickness of 0.2 millimeters or less.

6. The cellular telephone of claim 1 wherein the side walls of the frame include an inner face and wherein the web projects into and through the inner face of the side walls and effectively secures the web to the side walls.

7. A cellular telephone having a frame structure including a surrounding side wall and a web secured to the side wall and extending therebetween so as to form a unitary frame structure;

wherein the side wall and web are constructed of different materials and wherein the interconnected web comprises a non-casted, formed structure.

8. The cellular telephone of claim 7 wherein the same comprises an insert molded die-cast composite including a die-casted side wall structure and the non-casted formed web structure.

9. The cellular telephone of claim 8 wherein the die-casted side wall is formed of magnesium while the non-casted formed web structure includes a sheet of steel.

10. The cellular telephone of claim 8 wherein the web structure includes a perimeter bent flange embedded within the casted side wall structure for securing the web to the side wall structure.

11. The cellular telephone of claim 7 wherein the side wall structure is formed of casted magnesium while the web comprises a non-casted formed sheet of steel.

12. A cellular telephone having a structural frame that extends through an intermediate section of a cellular telephone and including an insert die-cast composite having a die-casted outer surrounding side wall and a non-casted formed web fixedly interconnected to the surrounding side wall and spanning across the same.

13. The cellular telephone of claim 12 wherein the side wall is casted from a material taken from the group consisting of magnesium and zinc, and wherein the web is formed of a sheet of steel.

14. The cellular telephone of claim 13 wherein the casted side wall includes an inner face and wherein the sheet of steel that forms the web projects into and through the inner face of the web such that a perimeter portion of the web is embedded within the casted side wall so as to securely connect the web with the side wall.

15. The cellular telephone of claim 14 wherein the web includes a bent perimeter portion that is embedded within the casted side wall of the frame so as to securely interlock the web with the side wall of the frame.

16. The cellular telephone of claim 12 wherein the insert die-casted composite extends between a printed circuit board and an attached battery that forms a part of the cellular telephone.

17. The cellular telephone of claim 12 wherein the thickness of the web is approximately 0.2 to 0.8 millimeters.