Apparatus for detecting movement of heat source

A heat source movement detecting system comprising:

• a sensor section including infrared detecting means for detecting change in temperature in a heat source;
• means for dividing the area to be observed by said infrared detecting means into a plurality of zones;
• means for overlapping at least two of said zones to form (a) at least one overlap zone comprising said at least two zones and (b) single zones without overlap;
• and
• discriminating means for judging the movement of the heat source between at least one of the single zones and the at least one overlap zone and between different single zones;
• said heat source movement detecting system being able to detect the movement of the heat source over the area to be observed by said sensor section by judging the movement of the heat source between at least one of the single zones and the at least one overlap zone, and between different single zones;
• wherein said infrared detecting means comprises at least two infrared sensors X and Y, the dividing means divides the area to be observed by said infrared sensor X into at least three single zones A, B and C and the area to be observed by said infrared sensor Y into at least three single zones a, b and c, said overlapping means combines said single zones A and a to form an overlap zone (A, a), and said discriminating means is able to judge the movement of the heat source between the single zones B and b, between the overlap zone (A, a) and the single zone B, and between the overlap zone (A, a) and the single zone b, wherein said heat source movement detecting system can detect the movement of the heat source over the entire area observed by said sensor section.