Patent ID: 11874448
Assignee: SONY INTERACTIVE ENTERTAINMENT LLC
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A lens system, comprising:
a Fresnel lens having a lens surface including a plurality of grooves that are concentrically formed, wherein:
both a pitch that is a distance between two adjacent grooves and a depth of each of the plurality of grooves vary with a distance from an optical axis that passes through a center of the lens system,
a distance from a center of the Fresnel lens and the pitch are defined as X (mm) and P (mm), respectively,
when 0 mm≤X≤10 mm, X and P satisfy following conditions:

P≤(0.00021(X−10){circumflex over ( )}4+0.6)×1.5

P≥(0.00021(X−10){circumflex over ( )}4+0.6)×0.5, and

when 10 mm≤X, P satisfies a following condition:

0.3≤P≤0.9.