Patent ID: 6783501
Filing Date: 2004-08-31
Classification: A61B

Abstract:
A heart rate monitor comprising a light-emitting element, a light-receiving element, and a CPU,light from said light-emitting element being reflected at or transmitted through blood running in a subcutaneous artery, said light-receiving element detecting the reflected or transmitted light, said CPU measuring a change in the bloodstream running in the a subcutaneous artery from a change in intensity of the light detected at said light-receiving element, and said CPU calculating a pulse rate of the change in the bloodstream per unit time from the measured value, and regarding the calculated pulse rate of the change in the bloodstream per unit time as a heat rate, wherein said light-emitting element and said light-receiving element are fitted to a human head and have a space of 4 mm to 10 mm between them, and wherein light with a wavelength of 900 nm to 1200 nm emitted by said light-emitting element is reflected at or transmitted through the subcutaneous artery and/or blood running in the subcutaneous artery and is detected at said light-receiving element.