Key input device and mobile communication terminal using the key input device

Patent metadata

Field	Value
Publication number	US-8947362-B2
Application number	US-200913131248-A
Country	US
Kind code	B2
Filing date	Nov 10, 2009
Priority date	Nov 26, 2008
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

First detection information related to electrical connection between each row signal line and each column signal line is received from a key matrix circuit (S 101 ). Based on the first detection information, it is determined whether a possibility exists that a user has pressed at least three key switches simultaneously and electrical connection between signal lines for a key switch that has not been pressed has been erroneously detected (S 108 ). Information in accordance with key switches pressed by the user is output based on the first detection information when the determination is negative (S 109 ), whereas output of information based on the first detection information is blocked when the determination is positive.

First claim

The invention claimed is:

1. A key input device comprising:
a key matrix circuit including a plurality of key switches and a matrix of row signal lines and column signal lines, a different one of the key switches being provided at each intersection of a row signal line and a column signal line;
a reception unit configured to receive, from the key matrix circuit, first detection information related to electrical connection between each row signal line and each column signal line;…

Assignees

• Kamii Toshihiro
• Miki Yasuhiro
• Kyocera Corp

Inventors

• Kamii Toshihiro
• Miki Yasuhiro

Classifications

• G06F3/023

  Physics · mapped topic

• H03M11/003 Primary

  Electricity · mapped topic

• G06F3/02 Primary

  Physics · mapped topic