| 摘要 |
<p>In the photosensor of the present invention, a light emitting element (2) and a light receiving element (3) are spaced a predetermined distance apart from each other on a film substrate (1). 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 (PD) is provided near light emitting diodes (LED1, LED2) included in the light emitting element. This photodiode detects a change in the quantity of light emitted. A CPU (16) 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 (37) and a heater (39) are provided in the vicinity of at least one of a light emitting diode (34) and a photodiode (31). A CPU (43) 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.</p> |
