Patent ID: 7330134
Filing Date: 2008-02-12
Classification: G06F,H03M

Abstract:
1. A key constructing method for a keyboard having M scan lines and N return lines, wherein M scan lines*N return lines generate electrical contacts of A 1 , A 2 , A 3 , . . . , A M*N , and said electrical contacts of {A 1 , A 2 , A 3 , . . . , A M*N } is an electrical contact set {A}, comprising the steps of: selecting at least one or more electrical contacts from said electrical contact set {A} in order to create an electrical contact set {B}; creating an electrical contact set {C}, wherein said electrical contact set {C}=said electrical contact set {A}−said electrical contact set {B}; combing at least one electrical contact from said electrical contact set {C} with one of the electrical contacts from said electrical contact set {B} to generate an expanded key.