Title:
KEYBOARD
Document Type and Number:
Japanese Patent JP3430191
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a keyboard in which the power consumption of a control part is reduced at the time of key scan and/or key code transmission on a key matrix.
SOLUTION: After any one of a lot of keys arranged on a key matrix 2 is operated, when all the keys are maintained in non-operating state (key-off state) longer than prescribed time such as 5 seconds, for example, or when any one of a lot of keys arranged on the key matrix is operated (key-on) and that operating state (key-on state) is continued longer than prescribed time such as 60 seconds, for example, the operating mode of the keyboard is changed from an ordinary mode to a stop mode. At the time of change, the operation stop of a clock signal generation circuit 11 or the operation stop of a control part 4 including the generation of scan signal to the key matrix 2 is performed.
Inventors:
Teiichi Shiga
Application Number:
JP13365996A
Publication Date:
July 28, 2003
Filing Date:
May 28, 1996
Export Citation:
Assignee:
Alps Electric Co., Ltd.
International Classes:
G06F1/26; G06F1/32; G06F3/02; G06F3/023; (IPC1-7): G06F3/02; G06F1/26; G06F1/32
Domestic Patent References:
| JP6242868A | ||||
| JP5134795A | ||||
| JP2193212A |
Attorney, Agent or Firm:
Kenjiro Take (2 outside)