Patent ID: 6371925
Filing Date: 2002-04-16
Classification: G01J

Abstract:
A radiation thermometer comprising:a probe through which infrared rays travel; a light receptor for a) receiving through said probe infrared rays radiated from at lest one of a human eardrum and an area adjacent said human eardrum; and b) avoiding receipt of infrared rays radiated from said probe, said light receptor including i) an optical condenser for condensing at least the infrared rays that pass through said probe; and ii) an infrared-ray-receiving element positioned to receive the infrared rays radiated from at least one of the eardrum and said area adjacent said eardrum upon receiving the infrared rays condensed by said optical condenser; wherein said infrared-ray-receiving element is positioned in a region that is farther from said optical condenser than an intersection between a light path and an optical axis, but nearer to said optical condenser than an image point of a hypothetical end point formed by said optical condenser, when viewed in a cross sectional plane including the optical axis of said optical condenser, where: said light path is a path that extends from the hypothetical end point to the image point of the hypothetical end point formed by said optical condenser by passing through a rim of said optical condenser on the same side as the hypothetical end point with respect to the optical axis; and said hypothetical end point is a point at which a straight line drawn from the rim of said optical condenser toward said probe in a manner to be tangent to an inner wall of said probe on the same side as the rim of said optical condenser with respect to the optical axis crosses a plane at a tip of said probe.