Optical element, imaging apparatus including the element, and method of manufacturing the optical element

摘要

A lens is obtained by injection molding. The lens includes a plurality of projections arranged on a surface at a pitch smaller than or equal to a predetermined value to reduce reflection of light with a wavelength equal to or greater than the pitch, and a gate mark formed on an outer periphery of the optical element in the injection molding. A peripheral portion of the surface includes a first region whose circumferential position corresponds to the gate mark, and a second region being adjacent to the first region. Axes of first projections in the first region are inclined more outward than axes of second projections in the second region.

主权项

1. An optical element obtained by injection molding, the element comprising:
a plurality of projections arranged on a surface at a pitch smaller than or equal to a predetermined value to reduce reflection of light with a wavelength equal to or greater than the pitch; and a gate mark formed on an outer periphery of the optical element in the injection molding, wherein: an optical axis of the optical element passes through the surface, the surface includes at least a first region and a second region, the first region being located between the gate mark and the second region, the projections in the first region each having a first axis and the projections in the second region each having a second axis, at least a part of the first region and a part of the second region has the same distance from the optical axis, and each of the first axis of the projections in the part of the first region is inclined more outwardly relative to the optical axis of the optical element than each of the second axis of the projections in the part of the second region.