Starry sky projection device, starry sky projection system and starry sky projection method

摘要

PROBLEM TO BE SOLVED: To provide a starry sky projection device, a starry sky projection system, and a starry sky projection method that can delete or fade a freely selected range of stars by using an image element in a part of the passage of a projection optical system.SOLUTION: A light emitted from a light source 1 passes through a condenser lens 2 and is reflected (turned on and off) by a DMD element 3a in the unit of a micro fine element, and an image is formed at a stellar original plate 6 through an image-forming lens 4. The light having passed through the stellar original plate 6 is projected on a dome screen, for example, by a projection lens 7.SELECTED DRAWING: Figure 1