Integrated light pipe for a shielded housing

• US 5,548,084 A
• Filed: 10/04/1993
• Issued: 08/20/1996
• Est. Priority Date: 10/04/1993
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Tracy, James L.
• Primary Examiner(s): Kincaid, Kristine L.
• Assistant Examiner(s): Horgan, Christopher
• Application Number:
  US08/131,353
• Time in Patent Office: 1,051 Days
• Field of Search: 174/35 R, 174/35 MS File, 174/35 GC, 361/816, 361/818, 455/300, 455/301
• US Class Current: 174/381
• CPC Class Codes: G02B 6/002 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/1336 Illuminating devices

Abstract

An electronic device (10) having a shielded housing (20) with an integrated light pipe (19 & 21) includes a substantially clear housing, a portion of which is arranged and constructed to form the integrated light pipe and plating (23), selectively applied to the substantially clear housing, to provide for effective electromagnetic interference shielding and to allow for sufficient light into the integrated light pipe.

Claims

1. An integrated light pipe in a shielded housing, comprising:

a substantially clear housing, a portion of which is arranged and constructed to form the integrated light pipe;

plating, selectively applied to the substantially clear housing, to provide for effective electromagnetic interference shielding and to allow for sufficient light into the integrated light pipe; and

a conductive adhesive about the periphery of a bottom housing surface for mounting the housing on a matching grounded surface of a substrate.

2. The integrated light pipe of claim 1, wherein the substantially clear housing further comprises a pair of recesses without plating on opposing sides of the substantially clear housing for allowing light to diffuse through a light entrapment area.

3. The integrated light pipe of claim 1, wherein the substantially clear housing is formed of a clear polymer.

4. The integrated light pipe of claim 1, wherein the plating is applied to a significant portion of an internal portion of the substantially clear housing.

5. The integrated light pipe of claim 1, wherein the plating is made of an appropriate reflective material.

6. The integrated light pipe of claim 2, wherein a reflective panel is placed on an internal portion of the substantially clear housing and below the light entrapment area to enhance light reflection.

7. An electronic device having a shielded housing with an integrated light pipe, comprising:

a substantially clear housing, a portion of which is arranged and constructed to form the integrated light pipe;

plating, selectively applied to the substantially clear housing, to provide for effective electromagnetic interference shielding and to allow for sufficient light into the integrated light pipe;

a substrate comprising a grounded surface that matches the periphery of a bottom housing surface, the substrate positioned below the substantially clear housing; and

a conductive adhesive about the periphery of the bottom housing surface for mounting the housing on the matching grounded surface of the substrate.

8. The electronic device of claim 7, wherein the substantially clear housing is formed of a clear polymer.

9. The electronic device of claim 7, wherein the plating is applied to a substantial portion of an internal portion of the substantially clear housing.

10. The electronic device of claim 7, wherein the electronic device is a portable communication device.

11. The electronic device of claim 10, wherein the portable communication device is a two-way radio.

12. The electronic device of claim 10, wherein the portable communication device is a selective call receiver.

13. The electronic device of claim 7, wherein the plating is made of an appropriate reflective material.

14. The electronic device of claim 7, wherein the electronic device further comprises a liquid crystal display mounted above the light pipe, the liquid crystal display being back-lit by the light pipe when light is diffused through the light pipe.

15. The electronic device of claim 7, wherein the substantially clear housing mounts above a radio frequency circuit on the substrate, thereby providing shielding to the radio frequency circuit.

16. A method for forming an integrated light pipe in a shielded housing for an electronic device comprising the steps of:

providing a substantially clear housing having an integrated light pipe portion; and

selectively applying plating on portions of the substantially clear housing to provide for effective electromagnetic interference shielding and to allow for sufficient light into the integrated light pipe portion;

applying a conductive adhesive about the periphery of a bottom housing surface for mounting the housing on a matching grounded surface of a substrate.

17. The method of claim 16, wherein the method includes the step of selectively applying the plating to a substantial portion of an internal portion of the substantially clear housing.

18. The method of claim 16, wherein the method includes the step of selectively applying a sufficiently reflective plating material to the substantially clear housing.