| 摘要 |
A device for detecting movable objects within a limited detection area comprises a number of juxtaposed photosemiconductors (A, B) on which an image of the detection area is adapted to impinge and which are uniformly distributed on branches (10, 11) of an electric bridge circuit, such that two juxtaposed photoresistors (A and B, respectively) are included in separate bridge branches (10 and 11, respectively). The bridge branches (10, 11) are connected to a rectifier (13) for generating an output signal. |
