Optical system of variable focal length having three consecutive movable elements

• 1. 具有超长焦距的连续变焦中波红外光学系统 [P] . 中国专利： CN103823294B . 2016.06.08
• 2. 具有超长焦距的连续变焦中波红外光学系统 [P] . 中国专利： CN103823294A . 2014-05-28
• 3. Variable focal length elements for adaptive optical zoom systems and methods [P] . 美国专利： US9641764B2 . 2017-05-02

  机译： 用于自适应光学变焦系统和方法的可变焦距元件

• 4. Variable lens system with a high focal length ratio for a photo camera has two negative and two positive lens groups each movable along the optical axis [P] . 德国专利： DE10338288A1 . 2004-03-04

  机译： 用于照相机的具有高焦距比的可变透镜系统具有两个负透镜组和两个正透镜组，每个透镜组均可沿光轴移动

• 5. Variable focal length optical element and optical system using the same [P] . 美国专利： US6603608B2 . 2003-08-05

  机译： 可变焦距光学元件和使用其的光学系统

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