The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 2014
Filed:
Sep. 08, 2009
Hidefumi Iwasa, Kawasaki, JP;
Hidefumi Iwasa, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
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.