| 摘要 |
<p>PURPOSE:To make a distance of an emission element and a photodetector equal, arrange characteristics by using a general purpose emission diode and a phototransistor and to operate a multiple photosensor stably by arranging the emission element and the photodetector by changing height alternately in the optical shaft direction. CONSTITUTION:Emission diodes 10a-10i are fitted to a printed board 11 and diodes 10a-10i radiate light through guide holes 12a-12i. 1/2 of the sum of a diameter 16 of the diodes 10a-10i and the holes 12a-12i are selected smaller than the pitch of a data hole. Phototransistors TR13a-13i are fitted to a printed board 14 and receive light through guide holes 15a-15i. The diodes 10a-10i and the TR13a-13i are arranged by changing height alternately in the light shaft direction, the distance 18 of both is made equal and an action of a multiple photosensor is made stable.</p> |
