Patent ID: 7652825

Claim:
A cover for a head-up display, said display including a case and a display source received in the case, and allowing a virtual image of an image displayed on the display source projected on a windshield of a vehicle through an opening of the case to be superimposed on a foreground image through the windshield which is visually recognized at an eye point of the vehicle, said cover configured to prevent foreign particles from entering an inside of the case through the opening, and allowing the image projected from the display source to pass therethrough, wherein said cover has substantially a wedge cross section so as to align a substantially straight light path of direct light from an arbitrary point on the display source through the cover without reflection with a reflected light path of reflected light from the arbitrary point and reflected twice on inner surfaces of the cover, wherein the cover is so formed that the reflected light emitted from the arbitrary point and reflected on an inside of an emitting surface as one of the inner surfaces of the cover passes toward a refraction point on an incident surface as the other one of the inner surfaces of the cover away from the windshield where the direct light from the arbitrary point is refracted, and the reflected light is on the same path from the refraction point to the windshield as the direct light.