Motherboard having a key combination input function by pressing a single key
AssigneesHONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., Hon Hai Precision Industry Co., Ltd.
InventorsDan Xu, Song-Lin Tong
Life of this patent
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Abstract
A keyboard includes a number of first keys, a control circuit, a switch circuit, and a second key. The switch circuit includes a number of switches. The second key is connected to first terminals of two switches of the switch circuit via the control circuit. A second terminal of each of the switches is connected to a first key. When a second key is pressed, the control circuit controls the switches corresponding to the pressed second key to be turned on, to activate the first keys which are connected to the switches.
Claims13
A keyboard comprising:
- a plurality of first keys;
- a control circuit;
- a switch circuit comprising a plurality of electronic switches;
- and
- at least one second key, wherein each second key is connected to first terminals of at least two electronic switches of the switch circuit via the control circuit, a second terminal of each electronic switch of the switch circuit is connected to a corresponding first key;
- wherein when the at least one second key is pressed, the control circuit controls the electronic switches corresponding to the pressed second key to be turned on, to start the first keys which are connected to the electronic switches for executing a function of key combination of the first keys.
A keyboard comprising:
- a plurality of first keys;
- a switch circuit comprising a plurality of electronic switches;
- at least one second key, wherein the at least one second key comprises three second keys;
- and
- a control circuit comprising a microcontroller, a crystal oscillator, first to third inverters, and first to third resistors, wherein the crystal oscillator is connected between a first clock pin and a second clock pin of the microcontroller, a voltage pin of the microcontroller is connected to a power source, a first input pin of the microcontroller is connected to a first electronic terminal of a first one of the second keys, a second input pin of the microcontroller is connected to a first electronic terminal of a second one of the second keys, a third input pin of the microcontroller is connected to a first electronic terminal of a third one of the second keys, second electronic terminals of the first to third second keys are grounded, the first resistor is connected between the first input pin of the microcontroller and the power source, the second resistor is connected between the second input pin of the microcontroller and the power source, the third resistor is connected between the third input pin of the microcontroller and the power source, a first output pin of the microcontroller is connected to an input terminal of the first inverter, a second output pin of the microcontroller is connected to an input terminal of the second inverter, a third output pin of the microcontroller is connected to an input terminal of the third inverter, each of output terminals of the first to third inverters are connected to first terminals of at least two electronic switches of the switch circuit, a second terminal of each electronic switch of the switch circuit is connected to a corresponding first key;
- wherein when the at least one second key is pressed, the control circuit controls the electronic switches corresponding to the pressed second key to be turned on, to start the first keys which are connected to the electronic switches for executing a function of key combination of the first keys.
Dependencies are inferred from the claim text.