Patent ID: 7833800

Claim:
A device comprising: a first layered structure with a support surface; and a second layered structure on the support surface, the second layered structure including: first and second pairs of thermal sensor components, each thermal sensor component having electrical resistivity that varies with temperature; each of the first pair of thermal sensing components and second pair of thermal sensing components each being capable of receiving respective thermal signals, with thermal signals received by the first pair of thermal sensing components differing from thermal signals received by the second pair of thermal sensing components; each thermal sensor component having a lower surface disposed toward the support surface; and bridge circuitry electrically connecting the first and second sets of thermal sensor components in a bridge; the bridge circuitry being capable of receiving drive signals to allow electrical detection of difference between resistivities of the first and second sets of thermal sensor components, the difference in resistivities indicating difference between respective thermal signals received by the first and second sets of thermal sensor components; the bridge circuitry including: for each thermal sensor component, at least two sets of one or more electrically conductive portions extending across and in electrical contact with the thermal sensor component's lower surface.