Patent ID: 9618766
Date: 2017-04-11
CPC Classifications: G02B

Claim:
1. An optical device comprising: a first luminous flux diameter enlargement element that includes a plurality of first light-transmissive layers which is provided with a first surface and a second surface that is disposed so as to be parallel to the first surface, and a first partially reflective layer that includes a dielectric multilayered film; a second luminous flux diameter enlargement element that includes a plurality of second light-transmissive layers which is provided with a first surface and a second surface that is disposed so as to be parallel to the first surface, and a second partially reflective layer that includes a dielectric multilayered film; and a retardation element that is disposed between the first luminous flux diameter enlargement element and the second luminous flux diameter enlargement element, wherein the plurality of first light-transmissive layers is laminated along a first direction so that the respective first surfaces thereof are mutually parallel to one another, the first partially reflective layer is disposed between two adjacent first light-transmissive layers among the plurality of first light-transmissive layers, the first partially reflective layer is disposed so as to be parallel to the first surface of one first light-transmissive layer among the plurality of first light-transmissive layers, the plurality of second light-transmissive layers is laminated along a second direction so that the respective first surfaces thereof are mutually parallel to one another, the second partially reflective layer is disposed between two adjacent second light-transmissive layers among the plurality of second light-transmissive layers, the second partially reflective layer is disposed so as to be parallel to the first surface of one second light-transmissive layer among the plurality of second light-transmissive layers, and the first direction intersects the second direction.