| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide circuits, systems and methods that can be generally used to detect light beam misalignment, so that compensation for such misalignment can be performed. <P>SOLUTION: In accordance with an embodiment, the circuit includes a photo-detector (PD) having a plurality of electrically isolated photo-detecting (PD) segments. Additionally, the circuit has electric circuits, including switches, configured to control how currents indicative of light detected by the plurality of electrically isolated PD segments are arithmetically combined. When the switches are in a first configuration, a signal produced by the electric circuit is indicative of vertical light beam alignment. When the switches are in a second configuration, the signal produced by the electric circuit is indicative of horizontal light beam alignment. The signals indicative of vertical light beam alignment and horizontal light beam alignment can be used to detect light beam misalignment, so that compensation for such misalignment can be performed. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
