Optical material and optical element
AssigneeCanon Kabushiki Kaisha
InventorHidefumi Iwasa
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Abstract
Provided is an optical material including a polymer of a mixture which contains a sulfur-containing compound, a fluorene compound with a fluorene skeleton, and an energy polymerization initiator. The sulfur-containing compound contains, in a molecule, at least one kind of group selected from the group consisting of a sulfide group, a sulphone group, a sulfoxide group, a thiol group, and a thioester group. A refractive index of the polymer of the mixture is 1.65 or more to less than 1.92, an Abbe constant thereof is 15 or more to less than 22, and a difference Δθg,F between a secondary dispersion property θg,F thereof and a secondary dispersion property θg,F of a normal optical material which is expressed by θg,F=0.6438−0.001682νd is 0.05 or more to less than 0.13.
Claims8
An optical material comprising a polymer of a mixture of:
- a sulfur-containing compound containing, in a molecule, at least one kind of group selected from the group consisting of a sulfide group, a sulphone group, a sulfoxide group, a thiol group, and a thioester group;
- a fluorene compound at least having a fluorene skeleton;
- and
- an energy polymerization initiator, wherein:
- the polymer of the mixture has a refractive index of 1.65 or more to less than 1.92 and an Abbe constant of 15 or more to less than 22;
- and
- a difference Δθg,F between a secondary dispersion property θg,F of the polymer of the mixture and a secondary dispersion property θg,F expressed by the following expression is 0.05 or more to less than 0.13,
- θg,F=0.6438−0.001682νd
- where νd is an Abbe constant.
An optical material comprising a polymer of a mixture of:
- a sulfur-containing compound containing, in a molecule, at least one kind of group selected from the group consisting of a sulfide group, a sulphone group, a sulfoxide group, a thiol group, and a thioester group;
- a fluorene compound at least having a fluorene skeleton;
- an energy polymerization initiator;
- and
- metal oxide fine particles, wherein:
- the polymer of the mixture has a refractive index of 1.65 or more to less than 1.92 and an Abbe constant of 15 or more to less than 22;
- and
- a difference Δθg,F between a secondary dispersion property θg,F of the polymer of the mixture and a secondary dispersion property θg,F expressed by the following expression is 0.05 or more to less than 0.13,
- θg,F=0.6438−0.001682νd
- where νd is an Abbe constant.
Dependencies are inferred from the claim text.