OPTICAL SENSOR AND IMAGE FORMATION DEVICE

摘要

PROBLEM TO BE SOLVED: To improve light blocking effect in an optical sensor where an optical element is mounted on a surface of a circuit board.SOLUTION: A housing 1 includes a wall part (a light blocking wall) 1a arranged between a light emitting element 3 and light receiving elements 4, 5. The wall part (the light blocking wall) 1a fits into a slit hole 19 provided between the light emitting element 3 of the circuit board 2 and the light receiving elements 4, 5.