Patent ID: 11914120
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Optics (Instruments)
Classification: CPC B  G | IPC B  G

Claim 13:
14. A method for correcting aberrations of light rays passing through a windshield, comprising:
orienting a windshield of a motor vehicle at a rake angle;
mounting a camera within an occupant compartment of the motor vehicle directed toward the windshield and configured to receive light rays through the windshield;
locating a sensor within the camera configured to receive the light rays; and
positioning a corrective element within the camera ahead of the sensor configured to direct passage of the light rays through the corrective element to the sensor, and to correct aberrations of the light rays passing through the windshield induced by the rake angle of the windshield prior to the light rays reaching the sensor, the corrective element being positioned within the camera, and the camera being positioned in a line of sight of the windshield such that the light rays travel from the windshield directly to the camera; and
wherein the corrective element is oriented at a corrective angle oriented opposite to the rake angle, an absolute value of the rake angle is equal to an absolute value of the corrective angle, the rake angle has a positive value, the corrective angle has a negative value, the camera is elongated along a camera axis, the windshield is elongated along a windshield axis, the rake angle is defined from the camera axis to the windshield axis, the corrective element is elongated along an element axis, the corrective angle is defined from the camera axis to the element axis, the corrective element has a first index of refraction, the windshield has a second index of refraction, the first index of refraction is equal to the second index of refraction, the corrective element has a first surface and a second surface opposite the first surface, the first surface is flat, the second surface is flat, the first surface is parallel to the second surface, the a first anti-reflective coating is applied to the first surface of the corrective element, a second anti-reflective coating is applied to the second surface of the corrective element, the first index of refraction is 1.5038, the corrective element has an Abbie number, the Abbie number is 66.922, the rake angle is 60 degrees, and the corrective angle is −60 degrees.