| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive operation panel by reducing the scale of a circuit in the case of designing an operation panel having large number of keys. SOLUTION: This operation panel device has a plurality of input keys (switches) 31-3n, which are selectively turned on or off by the operation of the user, a plurality of voltage-divider circuits (R11-R1n, R21), to each of which one of the plural keys 31-3n is inserted between power potential and the ground potential and which are different in the voltage-dividing ratio, an analog digital converter 41, which receives the output of these plural potential divider circuit at its common analog input terminal, and a deciding section 511 which decides as to which of the input keys is in on-state, based on the digital output of this analog/digital converter.
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