Small lens system for TOF
US12235412B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2021 |
| Grant date | Feb 25, 2025 |
| Priority date | — |
| Expiry date | May 21, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a small lens system including a first lens, a second lens, a third lens, and a fourth lens sequentially arranged from an object along an optical axis, wherein the thickness (ct1) of the first lens, the thickness (ct3) of the second lens, the thickness (ct5) of the third lens, and the thickness (ct7) of the fourth lens satisfy ct1+ct3>ct5+ct7, ct1>ct3, ct1>ct5, and ct1>ct7, the front surface of the first lens is convex toward the object while the sagittal amount of the first lens is increased depending on the height thereof, the refractive power (P2) of the second lens satisfies −0.01 mm−1<P2<0.01 mm−1, the front curvature (C3) and the rear curvature (C4) of the second lens satisfy |C3|<0.1 mm−1 and |C4|<0.1 mm−1, and the f-number of the lens system is less than 1.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.