| 摘要 |
PURPOSE:To provide a head up display device making a display image visible not only to a driver but also to occupants in an assistant's seat and a rear seat. CONSTITUTION:This head up display device is provided with a display 2 for displaying a display image, and a hologram 3 formed by recording a concave mirror 14 reflecting display light radiated from the display 2. A display image is reflected on the inside of a windshield 5 and focused in front of the outside of the windshield. The hologram 3 is manufactured through multiple exposure by changing the angle of the concave mirror 14 to a hologram dry plate 3a at the time of exposure so that the display light from the display 2 is diffracted and reflected in plural directions. |
