Optical structure, transfer foil, article, and method of producing optical structure
AssigneeToppan Printing Co., Ltd.
InventorNaoki MINAMIKAWA
Life of this patent
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Abstract
An optical structure includes a multilayer relief that has a first surface having an uneven shape, and a reflection layer that is formed on the first surface and reflects visible light. The multilayer relief includes a first resin layer that contains a non-radiation curable resin as a main component and constitutes the first surface, and a second resin layer that contains a radiation curable resin as a main component and is adjacent to the first resin layer. The first resin layer has a thickness smaller than an unevenness difference of the uneven shape.
Claims8
An optical structure, comprising:
- a multilayer relief that has a first surface having an uneven shape;
- and
- a reflection layer that is formed on the first surface and reflects visible light, wherein:
- the multilayer relief includes
- a first resin layer that contains a non-radiation curable resin as a main component and constitutes the first surface, and
- a second resin layer that contains a radiation curable resin as a main component and is adjacent to the first resin layer;
- and
- the first resin layer has a thickness which is less than an unevenness difference of the uneven shape.
A method of producing an optical structure, comprising the steps of:
- a step A of forming, in this order, on a carrier, a precursor layer made of a radiation curable resin, and a first resin layer containing a non-radiation curable resin as a main component;
- a step B of pressing, against the first resin layer, an embossing cylinder that has a surface shape having an unevenness difference larger than a thickness of the first resin layer, and transferring the surface shape to the first resin layer and the precursor layer;
- a step C of curing the precursor layer by radiation exposure to form a second resin layer;
- and
- a step D of forming a reflection layer on the first resin layer.
Dependencies are inferred from the claim text.