| 摘要 |
A photosensor is disclosed comprising a light emitting element and a light receiving element spaced a predetermined distance apart from each other on a film substrate. Light is transmitted from one side to the other side of a subject, and a change in magnitude in absorption of this transmitted light by the subject is then detected, resulting in a detection of information of the living body. A photodiode is provided near light emitting diodes included in the light emitting element. This photodiode detects a change in the quantity of light emitted. A CPU corrects a change in the quantity of light with a change in the temperature of the light emitting element so as to control a current flowing to the light emitting element. Further, a thermistor and a heater are provided in the vicinity of at least one of a light emitting diode and a photodiode. Another CPU controls a current flowing through the heater in response to a detection output of the thermistor so that the temperature of at least either the light emitting element or the light receiving element becomes constant.
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