Importance

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Abstract

A polarization conversion element includes: a first transparent member, having: a light incident surface; a light exit surface almost parallel to the light incident surface; a first coating-forming surface formed to have a predetermined angle with the light incident surface and the light exit surface; a second coating-forming surface formed to have a predetermined angle with the light incident surface and the light exit surface, the second coating-forming surface being almost parallel to the first coating-forming surface; a polarization separation coating formed on the first coating-forming surface; and a reflective coating formed on the second coating-forming surface; a plurality of second transparent members, having: a light incident surface formed on a same plane on which the light incident surface of the first transparent member is formed; and a light exit surface formed on a same plane on which the light exit surface of the first transparent member is formed, the plurality of second transparent members being alternately joined with the first transparent member; and a polarization conversion member converting polarized light arranged in one of a light path for polarized light transmitting the polarization separation coating and a light path for polarized light reflected by the reflective coating; wherein the polarization separation coating includes a first polarization separation coating layer and a second polarization separation coating layer, the first polarization separation coating layer being formed with a first low refractive index coating made of a first low refractive index material having compressive stress and a high refractive index coating made of a high refractive index material alternately laminated, the second polarization separation coating layer being formed with a second low refractive index coating made of a second low refractive index material having tensile stress and the high refractive index coating alternately laminated.

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First Claim