Optical system, optical apparatus, and method for manufacturing the optical system
US10481370B2 · kind B2 · utility
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6References
22Claims
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Key dates
| Filing date | Feb 13, 2014 |
| Grant date | Nov 19, 2019 |
| Priority date | — |
| Expiry date | Feb 13, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49826
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system has, in order from an object: a first lens having negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens having negative refractive power; and a sixth lens having positive refractive power, wherein the following conditional expression (1) is satisfied: 1.52<L3R1/f3 - - - (1), where L3R1 denotes a radius of curvature of an object side lens surface of the third lens L3, and f3 denotes a focal length of the third lens L3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.