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Title:
OPTICAL SYSTEM, PHOTOGRAPHY DEVICE, AND MOVABLE PLATFORM
Document Type and Number:
WIPO Patent Application WO/2021/195884
Kind Code:
A1
Abstract:
An optical system, a photography device, and a movable platform. The optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from an object side to an image side. The first lens, the second lens, the fifth lens, and the seventh lens have negative focal power. The third lens, the fourth lens, and the sixth lens have positive focal power. The optical system satisfies the following expressions: 1.5<|f1/f|<2.5, 4<|(f2+f1)/f|<6, 1<|f3/f|<2, 1<|f4/f|<2, 0.9<|f5/f|<1.5, 0.9<|f5/f6|<1.5, 4.5<|f7/f6|<6, 4.5<|f7/f|<6, 4<|TL/f|<5, and 0.2<|BFL/TL|<0.5, wherein f is the focal length of the optical system, f1 to f7 are the focal lengths of the first lens to the seventh lens, respectively, TL is the distance on an optical axis from the center of the lens surface of the first lens close to the object side to the imaging surface, and BFL is the distance on the optical axis from the center of the lens surface of the seventh lens close to the image side to the imaging surface.

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Inventors:
GAN RUTING (CN)
Application Number:
PCT/CN2020/082197
Publication Date:
October 07, 2021
Filing Date:
March 30, 2020
Export Citation:
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Assignee:
SZ DJI TECHNOLOGY CO LTD (CN)
International Classes:
G02B15/177; G02B13/06; G02B13/18
Foreign References:
CN108873254A2018-11-23
CN108388004A2018-08-10
CN101373261A2009-02-25
CN110244432A2019-09-17
CN110291436A2019-09-27
CN107907972A2018-04-13
CN107589531A2018-01-16
CN205679843U2016-11-09
US20180259744A12018-09-13
US20090015936A12009-01-15
Attorney, Agent or Firm:
SHENZHEN LIDAO INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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