Composite optical element and process for production thereof, and imaging device and optical recording/reproduction device each equipped with the composite optical element
View Patent ↗The present invention provides a composite optical element including a resin layer that is less susceptible to yellowing and has small cure shrinkage during formation. The present invention is a composite optical element including a resin layer obtained by polymerizing a resin composition containing a (meth)acrylate compound of a saturated aliphatic epoxy compound, a multifunctional isocyanurate compound, and a photopolymerization initiator.
1. A composite optical element comprising a resin layer obtained by polymerizing a resin composition containing
a (meth)acrylate compound of a saturated aliphatic epoxy compound,
a multifunctional isocyanurate compound, and
a photopolymerization initiator,
wherein the (meth)acrylate compound is a compound represented by a formula:
where R 1 and R 2 each denote a hydrogen atom or a methyl group, and R 3 denotes a saturated aliphatic hydrocarbon group,
wherein the multifunctional isocyanurate compound is a compound represented by a formula:
where l+m+n=1, 0.9 or 2.2.
2. The composite optical element according to claim 1 , wherein the R 3 is a linear saturated aliphatic hydrocarbon group.
3. The composite optical element according to claim 1 , wherein the resin composition contains two or more types of the (meth)acrylate compounds.
4. The composite optical element according to claim 1 , wherein the resin composition contains a (meth)acrylate compound in which R 3 in the formula (1) is a linear saturated aliphatic hydrocarbon group, and a (meth)acrylate compound in which R 3 in the formula (1) is a cyclic saturated aliphatic hydrocarbon group.
5. The composite optical element according to claim 1 , wherein the resin composition further contains urethane acrylate.
6. The composite optical element according to claim 1 , wherein the resin composition further contains an organosilane compound.
7. The composite optical element according to claim 1 , wherein the resin composition further contains a fluorine compound.
8. The composite optical element according to claim 1 , comprising the resin layer, and an optical substrate with the resin layer being formed on an upper surface thereof.
9. The composite optical element according to claim 8 , wherein the optical substrate has a thickness of at least 1 mm but not more than 30 mm, and the surface of the optical substrate on which the resin layer is formed has a curvature radius of at least 3 mm but not more than 100 mm.
10. The composite optical element according to claim 1 , wherein the resin layer has a thickness of at least 50 μm but not more than 2000 μm, and the thickness varies with location.
11. An imaging device comprising the composite optical element according to claim 1 .
12. An optical recording and reproducing device comprising the composite optical element according to claim 1 .
13. A composite optical element comprising a resin layer obtained by polymerizing a resin composition containing
a (meth)acrylate compound of a saturated aliphatic epoxy compound,
a multifunctional isocyanurate compound, and
a photopolymerization initiator,
wherein the (meth)acrylate compound is a compound represented by a formula:
where R 1 and R 2 each denote a hydrogen atom or a methyl group, and R 3 denotes a saturated aliphatic hydrocarbon group,
wherein the multifunctional isocyanurate compound is a compound represented by a formula:
where l+m+n=0.9.