Patent ID: 8665678

Claim:
A reproduction device, comprising: a rotatable operation disk part, structured by an annular disk-shaped member, for performing an input related to reading of data stored in a memory; a capacitance sensor section configured to output a sensor value expressing a change of a capacitance according to depression of the rotatable operation disk part, wherein the capacitance sensor section contains at least one sensor pattern; a storage part configured to store and update a reference value corresponding to the sensor value obtained while the rotatable operation disk part is not depressed; and a control part configured to judge presence/absence of pressing on the rotatable operation disk part, wherein the control part calculates a relative value change and an absolute value change, each change based on a difference between the reference value previously stored in the storage part and the outputted sensor value, wherein the relative value represents a value obtained by converting the sensor value into a vector quantity and the absolute value represents a value obtained directly from the sensor value.