Patent ID: 8405912

Claim:
A headup display device comprising: an indicator configured to indicate an image; a reflection unit configured to reflect the image indicated on the indicator and project the image on a combiner to indicate a virtual image of the image at a position viewable for a user; a stepping motor configured to rotate the reflection unit to move the virtual image continuously in a predetermined section of the combiner; and a drive control unit configured to control the stepping motor, wherein the drive control unit is configured to control a driving power of the stepping motor such that a smoothness parameter becomes less than a predetermined value, and the smoothness parameter is defined by a fraction including a numerator and a denominator, wherein the numerator is a difference between a maximum speed of the virtual image when the virtual image moves continuously in the predetermined section and an average speed of the virtual image when the virtual image moves continuously in the predetermined section, wherein the denominator is the average speed.