Title:
OPTICAL IMAGING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2020/010878
Kind Code:
A1
Abstract:
An optical imaging system, comprising, in an order from an object side to an image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has a positive focal power; the second lens has a negative focal power, the object side surface thereof being a concave surface, and the image side surface thereof being a convex surface; the third lens has a focal power; the fourth lens has a positive focal power, the object side surface thereof being a concave surface, and the image side surface thereof being a convex surface; the fifth lens has a focal power; the sixth lens has a focal power; and the seventh lens has a positive focal power, the object side surface thereof being a convex surface. The total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfies f/EPD ≤ 1.8.
Inventors:
YOU XINGHAI (CN)
ZHANG KAIYUAN (CN)
HUANG LIN (CN)
ZHANG KAIYUAN (CN)
HUANG LIN (CN)
Application Number:
PCT/CN2019/081361
Publication Date:
January 16, 2020
Filing Date:
April 04, 2019
Export Citation:
Assignee:
ZHEJIANG SUNNY OPTICAL CO LTD (CN)
International Classes:
G02B13/00; G02B13/18
Foreign References:
| CN108121052A | 2018-06-05 | |||
| CN108873255A | 2018-11-23 | |||
| CN208521053U | 2019-02-19 | |||
| CN204188870U | 2015-03-04 | |||
| CN108051902A | 2018-05-18 | |||
| JPH10206729A | 1998-08-07 |
Attorney, Agent or Firm:
INSIGHT INTELLECTUAL PROPERTY LIMITED (CN)
Download PDF:
Previous Patent: NEEDLE SELECTION APPARATUS AND METHOD FOR LATCH NEEDLE WARP KNITTING MACHINE
Next Patent: OPTICAL IMAGING SYSTEM
Next Patent: OPTICAL IMAGING SYSTEM