Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Reexamination Certificate
2008-04-08
2008-04-08
Schwartz, Jordan (Department: 2873)
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
C359S013000
Reexamination Certificate
active
07355796
ABSTRACT:
A simple reflecting layered structure is disclosed that is attached to, or incorporated into, an automobile windshield that allows a head-up-display (HUD) to be viewed through anti-glare, p-polarized sunglasses without double imaging and without substantial net alteration of the polarization state of light. The invention relies on the negligible reflection of p-polarized light at material interfaces oriented at the typical angles within an automobile HUD system. The reflecting structure consists of two polarization manipulating films sandwiching a s-polarized reflector. A suitable reflector could constitute the natural reflection off interfaces between the two films and a single medium of substantially different refractive index. One embodiment utilizes two stretched polymer half wave retardation films separated with an air gap. The optic axes of the films are essentially crossed oriented at approximately 45° to both s- and p-polarization axes.
REFERENCES:
patent: 6636370 (2003-10-01), Freeman
patent: 6654070 (2003-11-01), Rofe
patent: 6744478 (2004-06-01), Asakura et al.
patent: 6878425 (2005-04-01), Gomes
patent: 6993872 (2006-02-01), Katsuragawa
patent: 7123418 (2006-10-01), Weber et al.
Baker & McKenzie LLP
ColorLink, Inc.
Jones James C
Schwartz Jordan
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