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US 4,395,704 AGranted
Input device for electronic apparatus
AssigneeCanon Kabushiki Kaisha
InventorsJuji Kishimoto, Ichiro Sado, Mitsuo Cho
Life of this patent
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Abstract
An input device for electronic apparatus includes key signal output lines each having plural key switches connected thereto and circuitry for separating the key signals into specific key signals thereby identifying the plural key switches.
Claims2
An input device for electronic apparatus comprising:
- a first plurality of spaced keys each for producing a signal;
- a first key signal line to which each of said first keys is coupled for conducting a signal therefrom;
- a plurality of first AND gate means each of which is coupled to said first key signal line;
- and
- setting means for selecting any one of said plurality of said first AND gate means to transmit signals produced by only a portion of said keys, said setting means including memory means, a manual switch, a second key signal line, and second AND gate means for changing the output status of said memory means to select a different one of said first AND gate means to transmit signals produced by a different portion of said keys, an output of said second AND gate means being coupled to the input of said memory means, and an input of said second AND gate means being coupled to said manual switch by said second key signal line.
2 more elements
Dependencies are inferred from the claim text.