| 摘要 |
PROBLEM TO BE SOLVED: To provide a reflector-type photoelectronic sensor capable of stably detecting a birefringent detection object with the use of a structure that can be easily assembled at a reduced cost.SOLUTION: A depolarizing film 8 is provided between a reflector 4 and a region X through which a detection object passes. The depolarizing film 8 is made of a material having high birefringence. The depolarizing film 8 lets a birefringent detection object T2 pass therethrough so as to attenuate its birefringence. The depolarizing film 8 also turns light, which has become elliptically polarized light A5 from vertically polarized light A2, into unpolarized light A6.SELECTED DRAWING: Figure 2 |
