摘要 |
<p>PURPOSE:To eliminate the defect of decrease in current transmission rate by covering the light emitting opening part and the light receiving opening part of a housing case with a light transmitting dustproof plate. CONSTITUTION:A light emitting element 2 and a photodetector 3 are incorporated in a housing case 1 made of resin. A light-transmitting-resin dustproof plate 6 is inserted into a light emitting opening part 4 and a light receiving opening part 5 of the housing case. The narrowed space between a light emitting part and a light receiving part as in the structure wherein the outer surface of the housing case 1 is covered with a transparent dustproof case can be avoided. In this way, it is not necessary to expand the interval between the light emitting part and the light receiving part. Decrease in current transmitting rate can be prevented. The interval between the light emitting part and the light receiving part is equal with respect to a general-purpose optical sensor. The current transmitting rate can be made equal.</p> |