Lens, imaging device, and light emitting device

An imaging device, comprising:

• a lens including:
• a center region located in a central portion;
• and
• a plurality of ring-shaped peripheral regions located around the center region,
• wherein a pattern in the peripheral regions has constant intervals in an angular direction,
• an angular interval Δθk:Δθk+1 is an integer ratio Mk:Mk+1, where Δθk represents an angular interval in a k-th peripheral region from an inner side among the peripheral regions, and Δθk+1 represents an angular interval in a (k+1)-th peripheral region from the inner side, the (k+1)-th peripheral region being adjacent to the k-th peripheral region, and
• the Mk+1 is an integer smaller than 10;
• and
• an imaging element that receives light via the lens.

A light emitting device, comprising:

• a lens including:
• a center region located in a central portion;
• and
• a plurality of ring-shaped peripheral regions located around the center region,
• wherein a pattern in the peripheral regions has constant intervals in an angular direction,
• an angular interval Δθk:Δθk+1 is an integer ratio Mk:Mk+1, where Δθk represents an angular interval in a k-th peripheral region from an inner side among the peripheral regions, and Δθk+1 represents an angular interval in a (k+1)-th peripheral region from the inner side, the (k+1)-th peripheral region being adjacent to the k-th peripheral region, and
• the Mk+1 is an integer smaller than 10;
• and
• a light emitting element that emits light that enters the lens.

A lens, comprising:

• a first peripheral region that is an annular region centered around an optical center, and is divided into N1 first periodic regions at each center angle θ1;
• a second peripheral region that is located on an outer side of the first peripheral region, is an annular region centered around the optical center, and is divided into N2 second periodic regions at each center angle θ2;
• and
• a circular center region that is located on an inner side of the first peripheral region, and is centered around the optical center,
• wherein a pattern is provided in the first periodic regions and the second periodic regions, on a basis of position coordinates in a polar coordinate system,
• the center angle θ1 is greater than the center angle θ2,
• the center region has four or more central symmetry axes that are symmetry axes of the pattern,
• the pattern in the center region is symmetric about the central symmetry axes, and
• a layout of the pattern in the center region is an orthogonal coordinate layout.