OPTICAL MEMBER, PROJECTION DEVICE, HEAD-MOUNTED DISPLAY, HEAD-UP DISPLAY, VEHICLE, SPECTROMETER, AND IMAGE FORMING APPARATUS

摘要

To provide an optical member that can diffract a specific wavelength with high efficiency, a projection device, a head-mounted display, a head-up display, a vehicle, a spectrometer, and an image forming apparatus.SOLUTION: An optical member 10 comprises: a curved surface part 11; and fine structures 12 that are formed on the curved surface part 11 at a predetermined pitch, and the predetermined pitch changes according to the curvature of the curved surface part 11.SELECTED DRAWING: Figure 2A