Title:
OPTICAL IMAGING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/114189
Kind Code:
A1
Abstract:
An optical imaging system. The imaging system sequentially comprises from an object side to an image side along an optical axis: a first lens (E1), a second lens (E2), a third lens (E3), and a fourth lens (E4). The first lens (E1) has a negative focal power; the second lens (E2) has a positive focal power or a negative focal power; the third lens (E3) has a positive focal power or a negative focal power, and an image side surface (S6) thereof is concave; the fourth lens (E4) has a positive focal power, and an image side surface (S8) thereof is concave. A total effective focal length f of the optical imaging system and an entrance pupil diameter (EPD) of the optical imaging system satisfy f/EPD≤1.60.
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Inventors:
HUANG LIN (CN)
WANG XINQUAN (CN)
WANG XINQUAN (CN)
Application Number:
PCT/CN2018/086741
Publication Date:
June 20, 2019
Filing Date:
May 14, 2018
Export Citation:
Assignee:
ZHEJIANG SUNNY OPTICAL CO LTD (CN)
International Classes:
G02B13/14; G02B13/00
Foreign References:
| CN107807438A | 2018-03-16 | |||
| CN108008525A | 2018-05-08 | |||
| CN207663139U | 2018-07-27 | |||
| JP2002072095A | 2002-03-12 | |||
| CN107219610A | 2017-09-29 | |||
| CN103163627A | 2013-06-19 | |||
| CN107340589A | 2017-11-10 |
Attorney, Agent or Firm:
INSIGHT INTELLECTUAL PROPERTY LIMITED (CN)
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