INPUT DEVICE FOR TOUCH SWITCH

PROBLEM TO BE SOLVED: To provide the input device of a capacitance type touch switch for performing an input operation by using the dielectric constant of a human body for performing a stable input operation with respect to the installation place of the touch switch in equipment or ambient use conditions such as temperature, humidity and electromagnetic noise or an instable factor such as a secular change.SOLUTION: In a touch switch input means, not only an electrode for detection of human body detection but also an electrode for reference are disposed, and the electrode for detection installed so as to be near to the finger with which an operator performs an operation and the electrode for reference installed so as to be far from the finger with which the operator performs an operation are piled up so that an electric balance between the electrode for detection and the electrode for reference can be maintained in a state that any input operation to the touch switch is not performed. When the input operation of the touch switch is performed, it is determined that electric numerical values between the electrode for detection which is near to the finger and the electrode for reference which is far from the finger deviate from each other, and the presence/absence of the input operation of the touch switch is determined.