Veiling glare control holographic windshield
AssigneeHughes Aircraft Company
InventorRonald T. Smith
Life of this patent
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Abstract
A zero-degree mirror reflection hologram is embedded into a vehicle windshield to reduce veiling glare. The hologram partially reflects sunlight in the visible wavelength range incident on the windshield between 0 and substantially 70 degrees, and therefore blocks a substantial portion of visible sunlight that would otherwise pass through the windshield and reflect off the dashboard. The portion of light that does reflect off the dashboard which could enter the driver's eyebox does not reflect appreciably off the hologram because the hologram reflection peak is in the ultraviolet at high off-axis angles.
Claims24
A veiling glare holographic windshield for vehicles, comprising:
- inner and outer windshield singlets;
- a zero-degree mirror reflection hologram disposed between said two singlets, said hologram having a high reflectance zone in the visible spectral range at normal incidence;
- and
- wherein said reflection hologram is characterized by a hologram reflection peak which is in the ultraviolet range at high off-axis angles of incidence.
A veiling glare holographic windshield assembly for vehicles comprising a dashboard, comprising:
- a transparent windshield disposed at an acute angle relative to said dashboard;
- a zero-degree mirror reflection hologram having first and second opposed surfaces and applied to said windshield, said hologram characterized by fringes extending parallel to said surfaces, said hologram having a high reflectance zone in the visible spectral range at normal incidence to said windshield and a hologram reflection peak which is in the ultraviolet range at high off-axis angles of incidence.
A veiling glare holographic windshield for vehicles, comprising:
- inner and outer windshield singlets;
- a zero-degree mirror reflection hologram disposed between said two singlets, said hologram having a high reflectance zone in the visible spectral range at normal incidence;
- and
- wherein said reflection hologram is further characterized by a fringe spacing which increases monotonically from one side of said hologram to the other side.
Dependencies are inferred from the claim text.