US 2020/0026098 A1Published application

Lens, lens blank, and eyewear

AssigneeMitsui Chemicals, Inc.

InventorsYoshinobu OKADA, Eiichiro HIKOSAKA, Akihiro MURAMATSU

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Abstract

A lens is provided with a lens body. The lens body is provided with a Fresnel lens part in which a plurality of protrusions and depressions that constitute at least parts of a plurality of concentric circles are formed. A diffracting part has a horizontally elongated outer shape when viewed in a direction in which light enters the lens body, and at least parts of first outer peripheral edges of the diffracting part located at both ends in a longitudinal direction form circular arcs that extend along concentric circles. Second outer peripheral edges of the diffracting part that are located at both ends in a lateral direction are located inward from a concentric circle that includes circular arcs formed by parts of the first outer peripheral edges, and are connected to parts of the first outer peripheral edges forming the circular arcs via bent portion.

Claims15

Dependent claims

A lens, comprising:

a lens body;
and
a Fresnel lens portion provided in the lens body, the Fresnel lens portion being a portion in which a plurality of protrusions and depressions are formed, the plurality of protrusions and depressions forming at least a part of a plurality of concentric circles, wherein:
the Fresnel lens portion as seen in a direction in which light enters the lens body has a laterally-elongated external shape,
at least a part of first peripheral edges of the Fresnel lens portion forms a circular arc along one of the plurality of concentric circles, the first peripheral edges being positioned at both edges of the Fresnel lens portion in a longitudinal direction of the Fresnel lens portion, and
second peripheral edges of the Fresnel lens portion are positioned inside the one of the plurality of concentric circles which includes the circular arc formed by the part of the first peripheral edges, the second peripheral edges being positioned at both edges of the Fresnel lens portion in a transverse direction of the Fresnel lens portion and being connected, via a bent portion, to the part of the first peripheral edges forming the circular arc.

3 more elements

Dependencies are inferred from the claim text.