| 摘要 |
An optical sensor device ( 10, 10 ') is able to be coupled to a pane ( 14 ), particularly to a windscreen of a motor vehicle. A sensor unit ( 12 ) of the 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 fresnel lenses ( 42, 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 the pane ( 14 ) as a parallel light beam ( 34 a) without further substantial deflection. The parallel light beam ( 34 a) is coupled out from the pane ( 14 ) as a parallel light beam ( 34 b) after at least one reflection inside the pane ( 14 ). The light beam ( 34 b) impinges onto the receiver ( 28 ) as a converging light beam through the second fresnel lens ( 44 ).
|
