Head up display device

A head up display device for a vehicle, which reflects display light representing a display image emitted from a display by a concave mirror, and projects the display light to a combiner, the head up display device comprising:

• a case that retains the display and the concave mirror in a prescribed positional relationship;
• a first driving means configured to rotate the concave mirror;
• a second driving means configured to move the case forward or rearward in a longitudinal direction of the vehicle;
• a control means configured to, in response to a signal indicative of information about a viewpoint position of an observer, adjust a projection position of the display light on the combiner by operating the first and second driving means, wherein
• the second driving means comprises a gear and a motor for driving the gear, the gear of the motor being engaged with a rack disposed on the case;
• and a memory for storing correction values of the first and second driving means corresponding to the viewpoint position information, wherein the control means operates the first and second driving means based on the correction values, the control means is configured to change a correction parameter for correcting distortion of a virtual image projected to the viewpoint position of the observer, in accordance with operating states of the first and second driving means.

A head up display device for a vehicle, which reflects display light representing a display image emitted from a display by a concave mirror, and projects the display light to a combiner, the head up display device comprising:

• a case accommodating the display and the concave mirror in a prescribed positional relationship;
• a first driving means configured to rotate the concave mirror;
• a second driving means configured to move the case forward or rearward in a longitudinal direction of the vehicle;
• and
• a control means configured to, in response to a signal indicative of information about a viewpoint position of an observer, adjust a projection position of the display light on the combiner, by controlling the first driving means to rotate the concave mirror in a counterclockwise direction and at the same time controlling the second driving means to move the case rearward in the longitudinal direction, or by controlling the first driving means to rotate the concave mirror in a clockwise direction and at the same time controlling the second driving means to move the case forward in the longitudinal direction, wherein the control means operates the first and second driving means based on the correction values, the control means is configured to change a correction parameter for correcting distortion of a virtual image projected to the viewpoint position of the observer, in accordance with operating states of the first and second driving means.