A laser beam is projected through the optical system of an endoscope and scanned in raster fashion by means of a scanning head at a proximal end of the endoscope tube. The beam is projected from a distal end of the endoscope tube so as to be scanned over an object. Light reflected from the object is...http://www.google.com.hk/patents/US5045936?utm_source=gb-gplus-share專利 US5045936 - Laser scanning imaging apparatus and method of ranging
