Patent ID: 8507044

Claim:
A method of producing a sealed optical device, comprising: sealing an optical device with a cured molding material as an optical device sealing material, the molding material comprising a polyorganosiloxane compound as a main component, the polyorganosiloxane compound having a ladder structure including a repeating unit shown by the following formula (I) in the molecule, wherein A represents an alkylene group having 1 to 6 carbon atoms or an alkyleneoxy group having 1 to 6 carbon atoms of which the carbon atom bonds to the silicon atom, R 1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, X 0 represents a haloalkyl group having 1 to 10 carbon atoms, or a cyano group, R 2 represents a substituted or unsubstituted phenyl group, an alkyl group having 1 to 20 carbon atoms that is optionally substituted except with a halogen atom or a cyano group, an alkenyl group having 2 to 20 carbon atoms, or a group shown by -A 1 -CH(X 1 )—R 3 wherein A l represents a single bond or a linking group, X 1 represents a hydrogen atom or a group shown by OG wherein G represents a protecting group for a hydroxyl group, and R 3 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and l, m, and n are individually 0 or an arbitrary natural number, provided that l and n are not 0 at the same time; wherein the polyorganosiloxane compound has a weight average molecular weight of 1,000 to 10,000.