Collimation optical system null for especially helmet display unit

摘要

PURPOSE: To remove the cause of aberration an to improve the quality of a video by making a 1st mirror reflective and a 2nd mirror partially transparent. CONSTITUTION: This collimation optical system is constituted of a device for generating an optical video or a light source 1, an objective collimating lens or a collimator 2, a 1st parabolic mirror 4 and a 2nd parabolic mirror 5 in order along the same optical path. The mirrors 4 and 5 form a confocal system, and the mirror 4 is a total reflection mirror and the mirror 5 is translucent so as to make radiation from outside landscape pass. the mirrors 4 and 5 are put at the end of a photocoductor formed of a plate 10 made of transparent material having two parallel surfaces, and form the confocal optical system for enlarging 1. Thus, wider visual field is obtained while holding the accurate quality of the video.