Optical element, manufacturing method of optical element, and optical device

An optical device comprising:

• (a) a light source;
• (b) an optical element which selectively transmits specific polarized light from light emitted from the light source;
• and
• (c) a liquid crystal panel on which the polarized light emitted from the optical element is incident and which modulates an intensity of the polarized light in accordance with image information,
• wherein the optical element includes a substrate having a first region and a second region positioned on an outer periphery of the first region,
• a first projection group in which a plurality of line-shaped first projections made of a first material and extending in a first direction are arranged at first intervals in a second direction crossing the first direction is provided in the first region of the substrate,
• a second projection group in which a plurality of second projections made of the first material are arranged is provided in the second region,
• an electromagnetic wave incident from a side of one surface of the substrate is polarized in the first projection group,
• the second projection group has a checkerboard pattern when seen in a plan view, and
• a third projection line entirely connected and surrounding the first projection group is provided between the first region and the second region.

An optical element comprising:

• a substrate having a first region and a second region positioned on an outer periphery of the first region,
• wherein a first projection group in which a plurality of line-shaped first projections made of a first material and extending in a first direction are arranged at first intervals in a second direction crossing the first direction is provided in the first region of the substrate,
• a second projection group in which a plurality of second projections made of the first material are arranged is provided in the second region,
• an electromagnetic wave incident from a side of one surface of the substrate is polarized in the first projection group,
• the second projection group has a checkerboard pattern when seen in a plan view, and wherein each of the plurality of second projections are in at least one of an H-shape, a U-shape, and a frame-shape when seen in the plan view, and
• a third projection surrounding the first projection group is provided between the first region and the second region.