Patent ID: 7978389
Filing Date: 2011-07-12
Classification: G02B

Abstract:
1. An optical scanning device comprising a scan mirror configured to reflect and scan an incident light beam, and a transfer optical system configured to receive the light beam scanned by the scan mirror and to allow the light beam to enter the scan mirror again, the optical scanning device being characterized in that: the transfer optical system comprises a first concave mirror, a second concave mirror, a third concave mirror, and a fourth concave mirror, and a first reflection mirror, the first concave mirror reflects the light beam scanned by the scan mirror in such a manner that the light beam enters the second concave mirror, the second concave mirror reflects the light beam received from the first concave mirror in such a manner that the light beam enters the first reflection mirror, the first reflection mirror allows the light beam received from the second concave mirror to enter the third concave mirror, the third concave mirror reflects the light beam received from the first reflection mirror in such a manner that the light beam enters the fourth concave mirror, the fourth concave mirror reflects the light beam received from the third concave mirror in such a manner that the light beam enters the scan mirror, and the scan mirror scans and emits the light beam received via the first concave mirror, the second concave mirror, the third concave mirror, and the fourth concave mirror, to a plane of projection.