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US 7,473,521 B2Granted
Composite mask for producing a diffuser
AssigneeTomoegawa Co., Ltd.
InventorsTakamasa Harada, Fumio Kita, Andreas Zimmermann, Andreas Altherr, Martin Mennig, Peter W. Oliveira, Helmut Schmidt
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Abstract
The invention relates to an alternative composite mask that is substantially composed of a transparent support film coated with a transparent polymer matrix that contains light-absorbing pigment particles or metal particles having an average particle size d50 ranging between 0.5 and 10 μm.
Claims19
A method for the production of a diffuser for display films and architectural glass, the method comprising:
- providing a transparent support film;
- coating the transparent support film with a transparent polymer matrix containing light-absorbent pigment particles or metal particles having a mean particle size d50 of between 0.5 and 10 μm to thereby provide a composite mask;
- laminating the composite mask with a photopolymeric material;
- exposing the photopolymeric material to convergent light through the composite mask to produce a patterned photopolymeric material having a refractive index gradient corresponding to the particles present in the composite mask;
- curing the patterned photopolymeric material to provide the diffuser;
- and
- delaminating the diffuser from the composite mask.
4 more elements
Dependencies are inferred from the claim text.