| 主权项 |
1. A vehicular head-up display device that is mounted on a vehicle, the vehicular head-up display device comprising:
a display that emits display light representing display information; and a reflector that reflects the display light, which is emitted from the display, to a windshield to display a virtual image of the display information in a driver's forward visual field, the vehicular head-up display device further comprising: a stepper motor that is directly or indirectly connected to the reflector and rotates the reflector in a rotation direction; a rotation direction spring that applies a force to a rotary shaft of the stepper motor in one rotation direction of the rotary shaft; an axis direction spring that applies a force to the rotary shaft in an axial direction of the rotary shaft; and a controller that controls the stepper motor to control a rotation position of the reflector in the rotation direction, wherein: the controller adjusts the rotation position of the reflector according to a request signal from a driver, so that a position of the virtual image in the windshield is changed to a request position requested by the driver; in response to turn off of an ignition switch, the controller changes the rotation position of the reflector, so that the position of the virtual image is changed to a predetermined reset position, and, in response to subsequent turn on of the ignition switch, the controller returns the rotation position of the reflector to a position corresponding to the request position of the virtual image by rotating the stepper motor in an opposite direction by a changed rotation angle defined as a rotation angel that corresponds to a change in position of the virtual image from the request position to the reset position; and when the driver changes the request position to a new position in a direction toward the reset position and the ignition switch is turned off, the controller rotates the stepper motor to change the position of the virtual image to the reset position and thereafter instructs the stepper motor to perform a reverse operation, wherein in the reverse operation, the stepper motor rotates by a specified angle defined as an angle that corresponds to a hysteresis generated at a time of a change in the rotation direction of the reflector between forward rotation and backward rotation. |
