| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a photoelectric smoke sensor capable of easily and definitely forming an intersection angle between an optical axis of a light-emitting element and an optical axis of a light-receiving element. <P>SOLUTION: A photoelectric smoke sensor 100 includes an element holder 30 that is arranged at a first printed-circuit board 10 and comprises a storage part 39 with an approximately-trapezoidal cross section, and the storage part 39 stores a foldable second printed-circuit board 20 where a light-emitting element 40 and a light-receiving element 50 are mounted. An optical axis 41 of the light-emitting element 40 is perpendicular to one oblique face of the storage part 39, and an optical axis 51 of the light-receiving element 50 is perpendicular to the other oblique face of the storage part 39. The optical axes 41 and 51 passing through an optical bench hole 61 that is formed on an optical bench 60 intersect at an obtuse angle in a dark room 80 that consists of the optical bench 60 and an optical bench cover 70. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
