HOLOGRAM, LIGHT-TRANSMISSIVE REFLECTION PLATE, SCREEN, AND PROJECTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a screen that has high transparency, a hologram, a light-transmissive reflection plate, and a projection system with which a projected video can be reflected brightly and clearly and observed.SOLUTION: A hologram 1 has irregularities, reflects predetermined white light entered from one side at a predetermined angle, and transmits predetermined white light entered from the other side at a predetermined angle, and diffraction efficiency to transmitted light and diffraction efficiency to reflection light are different from each other.