The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 05, 2008
Filed:
Nov. 01, 2005
Tung-ming Hsu, Tu-cheng, TW;
Wen-feng Cheng, Tu-cheng, TW;
Tung-Ming Hsu, Tu-cheng, TW;
Wen-Feng Cheng, Tu-cheng, TW;
Sutech Trading Limited, Tortola, VG;
Abstract
A light guide () for illuminating keys of a keyboard or keypad of a portable electronic device, includes an array of apertures () and a groove () at one end of the light guide. The apertures are configured to illuminate the keys via a light source (). The light source is disposed adjacent to the groove. A peripheral wall around each aperture is configured partially as a reflecting surface, and partially as a transmitting surface. The reflecting angle of the reflecting surface is larger than a critical total internal reflection angle so as to transfer the light farther. The light guide has a desired uniform light by means of a light source. This provides the portable electronic device consuming little power.