(11) US5805085 Apparatus and method for scanning a key matrix

分割案，請參照 US5790054

這篇 reference 的就比較多了

Reference by:

1	7,714,746	STM	Method and apparatus for keyboard readout
2	7,158,055	Matsushita	Key input circuit, power supply control apparatus, and power supply control method
3	6,686,671	Matsushita	Key input circuit, power supply control apparatus, and power supply control method
4	6,630,927	Microsoft	Keyboard key discrimination employing drive line/sense line combinations and accomodating simultaneous key press conditions
5	6,621,484	Microsoft	Keyboard key discrimination based on time division multiplexing