PURPOSE: To force a display device to cope with the movement of driver's line of sight during during running of a vehicle by providing a means for rotating a reflecting means which reflects display light toward the position of driver's line of sight wind shield and making control in such a way that rotation angle comes to the optimum position of driver's line of sight based on a difference between the height of seat detected by a height detection means and the reference height of the reflecting means.
CONSTITUTION: A control means 9 computes a difference between the height H of a driver seat 7 detected by a height detection means 8 of the driver seat 7 and the reference height. The reference height means the height of seat which corresponds to the position of driver's line of sight when a reflecting means 5 which reflects display light 2 from a display means 1 comes to the reference position. A rotation means 6 is rotated by this difference, that is, rotation angle which is proportional to up and down strokes, and display light 2 which is reflected by rotating the reflecting means 5 is projected on a windshield 3 3 not only when a vehicle is stationary but also when it runs in correspondence to up and down strokes of the driver seat and is kept at the optimum position of driver's line of sight.
SUGIYAMA NAOMASA
ENDO YUTAKA
SHINGU KATSUMI
OKAME KUNIO
HIRUTA NOBUO
