The 4-element light-emitting diode suppresses the change of the light-emitting body within a certain period of time, thereby maintaining a stable light-emitting level for a long time, and the \"APC (Auto Power Control) circuit\" is newly adopted. Since the light-emitting amount can be controlled within a small amount, even the change that occurs in a very short time can be controlled, and stable detection is achieved by suppressing the instability of the light-emitting amount caused by the change of the surrounding environment that could not be suppressed before.
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