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:
Nov. 27, 2012
Filed:
Apr. 10, 2009
Muh Fong Chung, Bukit Jambul, MY;
Sian Tatt Lee, Georgetown, MY;
Choon Guan Ko, Sungai Dua, MY;
Fook Chuin NG, Taman Bayu, MY;
Muh Fong Chung, Bukit Jambul, MY;
Sian Tatt Lee, Georgetown, MY;
Choon Guan Ko, Sungai Dua, MY;
Fook Chuin Ng, Taman Bayu, MY;
Intellectual Discovery Co., Ltd., Seoul, KR;
Abstract
A light guide includes a light interface surface, top and bottom surfaces, a surface feature pattern, and a cut line. The light interface surface receives light into the light guide from a light source. The light received through the light interface surface reflects according to total internal reflection (TIR) within the light guide between portions of the top and bottom surfaces. The surface feature pattern disrupts the TIR and scatters at least some of the light outside of at least one surface of the top and bottom surfaces. The cut line redirects at least some of the light from a first direction to a second direction within the light guide. The first direction is a direction other than towards the surface feature pattern, while the second direction is a direction substantially towards the surface feature pattern. The light guide may back-illuminate an optical keypad with a plurality of push buttons.