Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F21
LIGHTING
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F21S
NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
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41/00
Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
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F21S41/60
characterised by a variable light distribution
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F21S41/63
by acting on refractors, filters or transparent cover plates
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F21S41/64
by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices
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F21S41/645
by electro-optic means, e.g. liquid crystal or electrochromic devices
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