An imaging device includes a first focusing element on which rays from an object are incident, a second focusing element from which the rays are emitted toward an imaging surface, and a roof mirror having surfaces which are connected to each other at an angle of 90.degree. so that a ridge line is formed,...http://www.google.com.au/patents/US5907438?utm_source=gb-gplus-sharePatent US5907438 - Imaging device
