US 12,339,447 B2
Temperature variable HUD motor control
Edo Omanovic, Livonia, MI (US); Patrick O'Connell, Novi, MI (US); and Prateek Sharma, Peachtree City, GA (US)
Assigned to Panasonic Automotive Systems Company of America, division of Panasonic Corporation of North America, Peachtree City, GA (US)
Filed by Panasonic Automotive Systems Company of America, division of Panasonic Corporation of North America, Peachtree City, GA (US)
Filed on Nov. 5, 2021, as Appl. No. 17/519,780.
Claims priority of provisional application 63/113,341, filed on Nov. 13, 2020.
Prior Publication US 2022/0155590 A1, May 19, 2022
Int. Cl. G02B 27/01 (2006.01); B60R 11/02 (2006.01); G02B 26/08 (2006.01)
CPC G02B 27/0101 (2013.01) [B60R 11/0229 (2013.01); G02B 26/0816 (2013.01); B60R 2300/205 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A heads up display arrangement for a motor vehicle, comprising:
a mirror positioned to reflect a light field produced by a picture generation unit such that the light field is again reflected by a windshield of the motor vehicle and is then visible to a human driver of the motor vehicle as a virtual image;
a stepper motor coupled to the mirror and configured to rotate the mirror;
a stepper motor driver coupled to the stepper motor and configured to set a torque of the stepper motor;
a temperature sensor attached to the stepper motor and configured to detect a temperature associated with the stepper motor; and
an electronic processor communicatively coupled to the temperature sensor and to the stepper motor driver, the electronic processor being configured to transmit a signal to the stepper motor driver to set a target torque for the stepper motor, the target torque being dependent upon the detected temperature;
a torque sensor disposed on the mirror and configured to detect a level of torque required to rotate the mirror, the electronic processor being coupled to the torque sensor, the set level of torque being dependent upon the detected level of torque required to rotate the mirror;
wherein the stepper motor driver is configured to set a torque of the stepper motor by adjusting an electrical resistance that is connected in series with the stepper motor.