A light scanning type confocal optical device comprises a light source section, a light transmitting section, a light scanning section, and a processing section. The scanning section includes a movable mirror, a fixed mirror and a converging lens. The movable mirror has an opening at the center, and...http://www.google.de/patents/US6172789?utm_source=gb-gplus-sharePatent US6172789 - Light scanning device and confocal optical device using the same
