| 摘要 |
An optical apparatus includes an optical element disposed on an optical path along which the light flux emitted from a light source travels, and a polarizing element disposed on the light flux emitting-side of the optical element. The polarizing element includes a first prism having a light flux incident-side end surface on which the light flux having emitted from the optical element is incident and an emitting-side inclined surface inclined to the light flux incident-side end surface, and a polarizing element body provided on the emitting-side inclined surface, the polarizing element body transmitting first linearly polarized light out of the light flux having passed through the first prism and reflecting second linearly polarized light polarized perpendicular to the first linearly polarized light toward the first prism. The optical element is integrated with the polarizing element with an interposed adhesive layer formed on the light flux incident-side end surface. The refractive index n0 of the adhesive layer is set to satisfy the following equation: <?in-line-formulae description="In-line Formulae" end="lead"?>1<=n1/n0xsin [2phi-arcsin {n0/n1xsin(theta-phi)}-2phi]<?in-line-formulae description="In-line Formulae" end="tail"?> where n1 represents the refractive index of the first prism, theta represents the angle between the optical axis of the light flux emitted from the light source and the light flux incident on the light flux incident-side end surface, phi represents the angle between a plane orthogonal to the optical axis and the light flux incident-side end surface, and phi represents the angle between the orthogonal plane and the emitting-side inclined surface.
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