Patent ID: 6415093
Filing Date: 2002-07-02
Classification: C03C,C09J,G02B

Abstract:
An optical device comprising at least two optically transparent optical parts which are bonded together with an optically transparent adhesive layer, wherein the adhesive layer is formed from a matrix containing oxygen atoms and at least one type of specific atoms selected from the group consisting of silicon, titanium, zirconium, aluminum and germanium, at least part of the specific atoms is bonded to other specific atom(s) through a polyvalent hydrocarbon group having 2 to 8 carbon atoms and directly bonded to at least one monovalent hydrocarbon group selected from the group consisting of an alkyl group, phenyl group, monovalent fluorine-containing hydrocarbon group, and monovalent sulfur-containing hydrocarbon group, and the contents of the above specific atom, the polyvalent hydrocarbon group and the monovalent hydrocarbon group are adjusted such that the refractive index value of the adhesive layer approximates the refractive index values of the at least two optically transparent optical parts, wherein when the refractive index values of the two optical parts are represented by n1 and n2 (n1&gE;n2), the adhesive layer between the optical parts has a refractive index n3 represented by the following expression (1):{square root over ((n1Â·n2+L ))}âˆ’(({square root over ((n1Â·n2+L ))}âˆ’n2)/3)âˆ’0.05&lE;n3&lE;{square root over ((n1Â·n2+L ))}+((n1âˆ’{square root over ((n1Â·n2+L ))})/3)+0.05â€ƒâ€ƒ(1) and wherein the adhesive layer contains the polyvalent hydrocarbon group and the monovalent hydrocarbon group in amounts of 0.01 to 30 wt % and 30 to 80 wt %, respectively.