Focused illumination, reduced light leakage floodlit center high

Details Focused illumination, reduced light leakage floodlit center high Focused illumination, reduced light leakage floodlit center high

1992-12-22

1995-01-17

Ben, Loha

Optical: systems and elements

Holographic system or element

Head up display

340479, 359 15, 359710, 362 801, 362328, G03H 100

Patent

active

053830393

ABSTRACT:
A holographic center high mounted stoplight (CHMSL) system for a vehicle having a rear window. The CHMSL system includes a stoplight hologram secured adjacent the rear window, a playback illumination source for providing along a source optical axis a vertically converging beam that converges to a horizontal line focus, and a thick concave/convex lens responsive to the vertically converging beam for (1) controlling the vertically converging beam to converge to a line focus that is within said lens and further from the illumination source than such line focus would be without the lens and (2) providing an output beam along an output axis that is tilted upwardly relative to the source optical axis. More particularly, the thick concave/convex lens includes a concave cylindrical entrance surface having a first horizontal cylinder axis that intersects the source optical axis, and a convex cylindrical exit surface having a second horizontal cylinder axis that is parallel to the first horizontal cylinder axis and is above the source axis such that the output axis is tilted upwardly relative to said source axis.

REFERENCES:
patent: 3079491 (1963-02-01), Janssen
patent: 4456948 (1984-06-01), Brun
patent: 4916593 (1990-04-01), Moss et al.
patent: 4935722 (1990-06-01), Pollack
patent: 5101193 (1992-03-01), Smith et al.

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