| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical sensor device capable of scanning a wide area while needing only a small space. SOLUTION: A sensor unit 12 of the optical sensor device 10, 10' has a transmitter 26, a receiver 28 and a photoconductor structure with a first Fresnel lens 42 associated with the transmitter 26 and a second Fresnel lens 44 associated with the receiver 28. The first and second Fresnel lenses 42 and 44 are arranged such that a diverging light beam 34 emitted from the transmitter 26 is oriented in parallel through the first Fresnel lens 42 and is coupled into a window glass 14 as a parallel light beam 34a without further substantial deflection. The parallel light beam 34a is coupled out from the window glass 14 as a parallel light beam 34b after at least one reflection inside the window glass 14. The light beam 34 impinges onto the receiver 28 as a converging light beam through the second Fresnel lens 44. COPYRIGHT: (C)2008,JPO&INPIT
|
