| 摘要 |
A head-up display (HUD) device (100) includes: a laser scanner (10) that projects laser light that forms a display image (71); and a screen member (30) that includes a plurality of optical elements (32) arrayed in a lattice form so as to diffuse laser light incident from the laser scanner (10) to the optical elements (32) and to guide the light toward a projection surface (91) side. Each optical element (32) has, on a surface thereof, a curved surface (33) in a convex curved form as a common curved form among the optical elements, and diffuses laser light that is let to outgo via the curved surface (33) to the projection surface (91) side. Regarding adjacent ones of the optical elements (32), sag amounts (S) from surface vertices (34) of the curved surfaces (33) thereof to a boundary (35) therebetween are different. |
