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Patent Searching and Data


Title:
OPTICAL IMAGING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/134314
Kind Code:
A1
Abstract:
An optical imaging system. The optical imaging system successively comprises a first lens (E1), a second lens (E2), a third lens (E3), and a fourth lens (E4) from the object side to the image side along an optical axis. The first lens (E1), the third lens (E3), and the fourth lens (E4) separately have positive focal power or negative focal power. The second lens (E2) has positive focal power, and the image side surface (S4) thereof is a concave surface. The image side surface (S8) of the fourth lens (E4) is a concave surface. The effective semi-diameter DT11 of the object side surface (S1) of the first lens (E1), the effective semi-diameter DT21 of the object side surface (S3) of the second lens (E2), the effective semi-diameter DT32 of the object side surface (S6) of the third lens (E3), the effective semi-diameter DT42 of the image side surface (S8) of the fourth lens (E4), and the entrance pupil diameter (EPD) of the optical imaging system satisfy the condition (DT11+DT21+DT32+DT42)/EPD≤2.4.

Inventors:
WANG XINQUAN (CN)
HUANG LIN (CN)
Application Number:
PCT/CN2018/085631
Publication Date:
July 11, 2019
Filing Date:
May 04, 2018
Export Citation:
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Assignee:
ZHEJIANG SUNNY OPTICAL CO LTD (CN)
International Classes:
G02B13/18; G02B13/14
Domestic Patent References:
WO2011052370A12011-05-05
Foreign References:
CN107315236A2017-11-03
CN107219610A2017-09-29
US20100097710A12010-04-22
CN102213820A2011-10-12
CN105652409A2016-06-08
Attorney, Agent or Firm:
INSIGHT INTELLECTUAL PROPERTY LIMITED (CN)
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