Integrated Autofocusing System and Method of Manufacture
Original Publication Date: 1980-Oct-01
Included in the Prior Art Database: 2005-Feb-13
A conventional autofocusing system is integrated into a solid block of optical material to avoid misalignment problems. The system uses a glass prism assembly to fold an autofocusing source and two detector apertures into a single plane. The prism assembly is arranged to pass a polarized laser beam to a target through a quarter-wave plate to rotate the reflected beam so that it may pass through a polarizing beam splitter to a neutral beam splitter and then to respective ones of a pair of photovoltaic detectors, all a part of an integral assembly.