| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a holography optical element by constituting it out of transparent material formed with a pin hole forming a beam splitter on the nearly center part of unicolor diffused light, and a computer hologram having a specific phase pattern. SOLUTION: By applying one sheet of holography optical element(HOE) to the three elements, a beam splitter, a lens, and a pin hole, miniaturization is realized. Namely, on the surface of transparent resin 5, the HOE 22 forming the center part (pin hole part) so as to have action as the lens 6 and the beam splitter 7, and forming computer hologram(CGH) of n-value (n>2) in the territory 8 of the circumference is used. Because the HOE 22 can be constituted to be thin even in the case of using a wide angle light source, miniaturization is attained. Since the circumferential territory 8 of the pin hole is constituted out of CGH of multi-value, it can be designed so as to have light shading performance, thus reducing cost. |
