AN OPTICAL SYSTEM DEMONSTRATING IMPROVED RESISTANCE TO OPTICALLY DEGRADING EXTERNAL EFFECTS

摘要

A system for projecting one or more composite optical images is presented, exhibiting enhanced resistance to external effects resulting in optical quality degradation. The system of the present invention serves to fix the focal length of the focusing element to the correct position. That is, any other transparent material or layer in contact with the system of the present invention does not substantially alter the optical accuracy or focal length of the composite image formed by the present system.