Holographic stop sign

Details Holographic stop sign Holographic stop sign

1997-03-21

1999-10-05

Spyrou, Cassandra

Optical: systems and elements

Holographic system or element

359 13, 359 15, 359 22, 362503, G03H 100

Patent

active

059633450

ABSTRACT:
A warning indicator that comprises a lamp hidden adjacent to the roof of a vehicle, such as a school bus, and a transmission hologram decal containing a hologram that is mounted on a front or rear window of the vehicle. The lamp projects a beam of light downward onto the transmission hologram decal where it is diffracted by the hologram into a predetermined angular field of view at the front of rear of the vehicle. The hologram projects an image, such as the word "STOP", for example, to warn drivers of other vehicles that the vehicle, such as the school bus, for example, has come to a stop. The hologram is preferentially designed to have an asymmetrically-shaped field of view.

REFERENCES:
patent: 5186533 (1993-02-01), Hori
patent: 5303129 (1994-04-01), Hori
patent: 5383039 (1995-01-01), Smith

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