PURPOSE: To attain the accurate blood pressure measurement by adjusting the light emitting luminance of a light emitting means in accordance with the individual difference of respective factors such as the thickness of a finger and an internal organ before the blood pressure measurement and light-receiving approximately a constant light quantity regardless of the tested person with a photoelectric detecting means.
CONSTITUTION: When a pressure to make the light receiving quantity of a photoelectric detecting means 4 into approximately a constant value is impressed based on the detecting signal of the photoelectric detecting means 4, a comparing means 25 to compare the detecting signal of the photoelectric detecting means 4 with a prescribed set value is provided, and based on the output signal of the comparing means 25, a driving current control means 26 to control the driving current of a light emitting means 3 in order to make the detecting signal of the photoelectric detecting means 4 into a prescribed set value is provided. Consequently, by adjusting the luminance of the light emitting means 3 in accordance with the individual difference between respective factors of the thickness of a finger and the inner organ, the photoelectric detecting means 4 can light-receive always approximately a constant light quantity regardless of the tested person. Thus, the blood pressure is attained accurately.
ONO TOSHIHIKO
SHIROMIZU TAKAYOSHI
