Optical rearview system for vehicle
AssigneeDonnelly Corporation
InventorBrent J. Bos
Life of this patent
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Abstract
An optical rearview system for a vehicle includes a reflective element which reflects light incident thereon and at least one diffraction grating in the path of light from an object rearward of the vehicle towards the reflective element. The at least one diffraction grating diffracts light from the object wherein light passing through the diffraction grating is directed towards the reflective element. Such optical rearview system eliminates secondary reflections and flare which have precluded successful commercialization of previously known optical rearview systems.
Claims16
An optical rearview system for a vehicle, comprising:
- a reflective element which reflects light incident thereon;
- and
- at least one diffraction grating for cooperating to produce an image of an object rearward of the vehicle substantially without flare in the form of a spread or smear of light superimposed thereon, said at least one diffraction grating being in the path of light from an object rearward of the vehicle towards the reflective element,
- said at least one diffraction grating diffracting light from the object wherein light passing through the at least one diffraction grating is directed towards the reflective element.
An optical rearview system for a vehicle, comprising:
- a reflective element which reflects light incident thereon positioned forward of the vehicle driver;
- and
- first and second transmission optical elements for diffracting light passing through that optical element into substantially a single order of light, and for cooperating to produce an image of an object rearward of the vehicle substantially without flare in the form of a spread or smear of light superimposed thereon;
- said first optical element being in the path of light from an object rearward of the vehicle towards the reflective element wherein light passing through said first optical element is directed towards the reflective element;
- said second optical element compensating chromatic aberrations introduced by the first optical element.
Dependencies are inferred from the claim text.