Manufacturing micro-structured elements
View Patent ↗According to the invention, a micro-structured element is manufactured by replicating/shaping (molding or embossing or the like) a 3D-structure in a preliminary product using an replication tool ( 1 ). The replication tool comprises a spacer portion ( 1 c ) protruding from a replication surface ( 1 a ). The replica (the micro-structured element, for example the micro-optical element or micro-optical element component) may be made of epoxy, which is cured—for example UV cured—while the replication tool is still in place. The replication process may be an embossing process, where the deformable or viscous or liquid component of the preliminary product to be shaped is placed on a surface and then the replication tool is pressed against this surface. As an alternative, the replication process may be a molding process.
1. A replication process for manufacturing a plurality of optical elements having a structured surface with structural features, comprising the steps of:
a. providing a replication tool having, on a replication surface, negative structural features being a negative of at least some of the optical element structural features, and further having at least one spacer portion protruding from the replication surface, the at least one spacer portion comprising at least a portion arranged between the structural features corresponding to different optical elements,
b. providing a substrate comprising a first surface and a material component in a plastically deformable or viscous or liquid state,
c. bringing said material component in contact with said replication surface while the spacer portion abuts against the first surface of the substrate while the material component is between the replication tool and the substrate and thus replicating from the replication surface, the plurality of optical elements,
d. hardening the material component, and
e. removing the replication tool,
f. wherein the hardened material component adhering to the first surface of the substrate forms the plurality of optical elements.
2. The process according to claim 1 , wherein the spacer portion comprises a plurality of spacers arranged in a regular pattern.
3. The process according to claim 1 , wherein the spacer portion is contiguous.
4. The process according to claim 1 , the replication tool comprising elastomeric material components.
5. The process according to claim 4 , wherein the replication tool further comprises a rigid back plate ( 33 ).
6. The process according to claim 1 , wherein the replication tool further comprises alignment pins.
7. The process according to claim 1 , wherein the spacer portion is arranged in a manner that at least one spacer portion border is formed around a replication area in a manner that the spacer portion border at least partially borders the replication area and forms a flow stop or re-directs the liquid material during the replication process.
8. The process of claim 4 , wherein the replication tool comprises PDMS.