Patent ID: 7956917

Claim:
A sensor apparatus comprising: a sensor array section including N sensor elements (N represents an integer of 2 or more) and outputting a voltage value V n in response to the result of sensing by the n-th sensor element (“n” represents any integer of 1 or more but N or less) among said N sensor elements; a difference operating section including: a subtracting circuit having first and second input terminals for respectively inputting the voltage values V n and V n-1 among N voltage values V 1 to V N outputted from said sensor array section and an output terminal for outputting a voltage value U n (n≠1) corresponding to the difference (V n −V n-1 ) between the voltage values V n and V n-1 ; and a switching device having N first switch elements disposed on all lines connecting the first input terminal of said subtracting circuit to all N output terminals of said sensor array section for respectively outputting the N voltage values V 1 to V N , and N second switch elements connecting the second input terminal of said subtracting circuit to the all N output terminals of said sensor array section; and an A/D converting section converting the voltage value U n outputted from said difference operating section into a digital value.