| 摘要 |
<p>A scanning optical device focuses a laser beam emitted by a laser oscillator (2) by a first lens (21a), scans it by a deflector (4) to direct it onto a medium to be scanned (7), by a second lens (21b), deflects a portion of the light transmitted through the second lens by a stationary mirror (8), directs it to a photo-sensor (11) by a third lens (21c) and uses an output of the photo-sensor to trigger a horizontal synchronous signal. At least two of the first lens (21a), the second lens (21b) and the third lens (21c) are integrally formed. <IMAGE></p> |
