Road marking unit and road marking system capable of switching f

Details Road marking unit and road marking system capable of switching f Road marking unit and road marking system capable of switching f

1999-01-20

2000-07-25

O'Shea, Sandra

Illumination

With static structure

Pavement

362551, 362559, 362561, 362327, 362341, E01F 900, F21V 704, F21V 500, F21V 700

Patent

active

06092909&

ABSTRACT:
A road marking unit (1) according to the invention comprises a house (10) with a light transmissive window (20). In the house (10) is arranged an electro-optic switch (30). In an activated state of the road marking unit (1) the electro-optic switch (30) achieves that light is reflected from the window (20) back to the window (20). In a de-activated state of the road marking unit (1) the electro-optic switch (30) achieves that light from the window (20) is absorbed. The road marking unit (1) of the invention has the advantage that it can also in bright environmental light it can be switched between visible and invisible.

REFERENCES:
patent: 4623222 (1986-11-01), Itoh et al.
patent: 4783598 (1988-11-01), McAdams, Jr.
patent: 5253109 (1993-10-01), O'Farrell et al.
patent: 5406414 (1995-04-01), O'Farrell et al.
patent: 5686979 (1997-11-01), Weber et al.
patent: 5839816 (1998-11-01), Varga et al.
T. Uchida "Reflective LCDs for Low Power Systems" SID 96 Digest, pp. 31-34.

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