Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-08-08
1990-05-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
128666, G01V 904
Patent
active
049298259
ABSTRACT:
A pulsimeter comprises a pulse sensor portion including a light emitting diode and a photodiade, and a main body, the pulse sensor portion and the main body being connected through a cord. The main body includes a received light comparing circuit for comparing a quantity of light received by the photodiode with a predetermined valve, and a display device for displaying a result of the comparison. If there is no abnormality in the cord and the pulse sensor portion in normal condition is not in contact with a human body, the quantity of received light in increased to cause a light emitting diode of the display device to be turned on. On the other hand, if there is any abnormality in the cord or the pulse sensor portion, the quantity of received light is not increased and the light emitting diode is not turned on. While the pulsimeter in normal condition is being used, the light emitting diode is not turned on because of light transmission through the human body. However, if short circuit occurs in the cord, the received light comparing circuit is operated as if it is operated by an increase in the quantity of received light, causing the light emitting diode to be turned on.
REFERENCES:
patent: 3815583 (1974-06-01), Scheit
patent: 4186390 (1980-01-01), Enemark
patent: 4305401 (1981-12-01), Reissmueller et al.
patent: 4425921 (1984-01-01), Fujisaki et al.
Nelms David C.
Tsuyama Mfg. Co., Ltd.
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