Patent classifications
G
PHYSICS
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G02
OPTICS
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G02B
OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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5/00
Optical elements other than lenses
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G02B5/02
Diffusing elements; Afocal elements
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G02B5/0205
characterised by the diffusing properties
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G02B5/021
the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
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G02B5/0221
the surface having an irregular structure
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