Method for forming aspherical optical element
AssigneeShimadzu Corporation
InventorHiroyuki Sasai
Life of this patent
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Abstract
An arrangement is made such that the magnitude of cure shrinkage obtained by multiplying the thickness of a resin layer 2 between a master mold 1 and a negative mold substrate 3 by the cure shrinkage ratio of the resin and the magnitude of cure shrinkage obtained by multiplying the thickness of a resin layer 4 between the negative mold 23 and the surface of the spherical or flat substrate 5 by the cure shrinkage ratio of the resin can be compensated for by each other. In accordance with this method, an aspherical optical element having a higher precision than ever can be formed at reduced cost by a replica method involving the addition of a resin layer to the surface of a spherical or flat substrate.
Claims4
A method for forming a negative mold for an aspherical optical element,
- the method comprising the steps of:
- polishing a surface of a master mold with a high precision;
- treating the surface of the master mold with a release agent;
- adding a resin to form a resin layer between a negative mold substrate and the surface of the master mold;
- curing the resin layer by a resin curing unit so that the resin layer and the negative mold substrate are bonded to each other to form a negative mold;
- and
- separating the negative mold from the master mold, wherein
- a shape of the negative mold substrate is represented by the equation:
- FN=−(2×FM−FR−s×FM)/(1−s),
- FN representing the shape of the negative mold substrate;
- FM representing the shape of the master mold;
- FR representing the shape of the spherical or flat substrate of the aspherical optical element as final product;
- and
- s representing the cure shrinkage ratio of the resin.
Dependencies are inferred from the claim text.