| 摘要 |
<p>Provided is an optical scanning device which solves a problem of device size increase. A transmission optical system (17) is provided with at least concave mirrors (19, 20). The transmission optical system (17) permits a beam scanned by a scanning mirror (16) to re-enter the scanning mirror through at least the concave mirrors (19, 20). Then, the scanning mirror (16) scans a laser beam entered through the concave mirrors (19, 20) and projects the laser beam to a projection surface.</p> |
