Lens module including five lenses of −+++− refractive powers, and electronic device using the same
US11409084B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2019 |
| Grant date | Aug 9, 2022 |
| Priority date | — |
| Expiry date | Oct 22, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens module includes a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, and an imaging surface, arranged in that sequence from an object side to an image side. The lens module uses infrared light which has a wavelength ranging from 920 to 970 nm, the lens module satisfies the following conditions: 0.0002<|1/F1|<0.01; D/TTL>1.1; CT4/ET4<1.8; F1 denotes a focal length of the first lens, D denotes a diameter of a largest imaging circle of the lens module, TTL denotes a distance between an object side surface of the first lens to the imaging surface, CT4 denotes a central thickness of the fourth lens, ET4 denotes an edge thickness of the fourth lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.