Patent ID: 7249884

Claim:
A radiation thermometer for measuring temperature of an object to be measured, comprising: a casing having a first and a second surfaces mutually facing and a third and a fourth surfaces mutually facing, and including an infrared radiation passing unit, which passes infrared radiation radiated from the object to be measured, on the first surface; a sensing element located within the casing, which detects infrared energy of the infrared radiation which has passed through the infrared radiation passing unit; a first board located within the casing between the second surface and the sensing element along the second surface, the first board having a first circuit installed thereon, which amplifies an output signal of the sensing element; a second board located within the casing between the third surface and the sensing element along the third surface, the second board having a second circuit installed thereon, which calculates temperature of the object to be measured according to a signal given from the first circuit of the first board; a third board located within the casing between the fourth surface and the sensing element along the fourth surface, the third board having a third circuit installed thereon, which supplies power to the first and the second circuits; a first and a second light sources located within the casing, which emit light to the object to be measured; and a heat diffusion member located within the casing, wherein an infrared radiation passage for leading the infrared radiation from the infrared radiation passing unit to the sensing element is formed within the casing, the first light source is located between the infrared radiation passage and the third surface, the second light source is located between the infrared radiation passage and the fourth surface, and the heat diffusion member is located between the infrared radiation passage and the first light source, between the infrared radiation passage and the second light source, between the second board and each of the sensing element and the first board, and between the third board and each of the sensing element and the first board.