Transparent eyelevel upconversion stoplight for vehicles

Details Transparent eyelevel upconversion stoplight for vehicles Transparent eyelevel upconversion stoplight for vehicles

1989-11-06

1990-06-19

Orsino, Joseph A.

Communications: electrical

Land vehicle alarms or indicators

External signal light system

340468, 362 801, 307 108, B60Q 126

Patent

active

049357220

ABSTRACT:
A transparent eyelevel stoplight for vehicles is disclosed, which operates on an upconversion principle wherein red light in an otherwise transparent crystal is excited by invisible infrared radiation. The crystal may take the form of a transparent plate or an optical fiber applied to the vehicle rear window. The host crystal material is doped with a suitable rare-earth ion, which when illuminated by infrared energy produces visible light. An infrared laser may be used to illuminate the doped crystal, and is activated by the vehicle brakes. The crystal material is transparent to ordinary visible light and therefore will not obscure the driver's vision.

REFERENCES:
patent: 4745525 (1988-05-01), Sheehy
patent: 4782494 (1988-11-01), Pollack et al.
patent: 4806903 (1989-02-01), Rust

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