Patent ID: 7086744
Filing Date: 2006-08-08
Classification: G02B,H04N

Abstract:
1. An optical unit used in a projection type image display apparatus, the optical unit comprising: a first optical element which performs at least one of color separation and color combination of light; a holding member attached to the first optical element; and a second optical element held by the holding member, the second optical element acting optically on one of incident light onto the first optical element and emergent light from the first optical element, wherein the holding member includes a holding structure holding the second optical element, the holding structure preventing the displacement of the second optical element in an optical axis direction of the first optical element which passes through the second optical element and allowing the rotation of the second optical element in a plane orthogonal to the optical axis direction; wherein the second optical element is held by the holding member by means of an adhesive agent, the hardness after curing of the adhesive agent being less than the hardness of the material of the second optical element; and wherein the adhesive agent is applied to a part of respective opposite sides of the second optical element and the each side is not orthogonal to a line jointing two application positions of the adhesive agent.