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Patent Searching and Data


Title:
FIXED-FOCUS OPTICAL LENS
Document Type and Number:
WIPO Patent Application WO/2021/232922
Kind Code:
A1
Abstract:
A fixed-focus optical lens, comprising an optical device: the optical device is provided with a focusing group (S1) that has a positive focal power and a fixed group (S2) that has a positive focal power in succession from the object side to the image side; the focusing group (S1) comprises a first cemented lens (U1), a diaphragm, a second cemented lens (U2) and a third cemented lens (U3); the fixed group (S2) comprises a ninth lens (G9); and the focal length of the optical device is f, the focal length of the focusing group (S1) is fS1, and the focal length of the fixed group (S2) is fS2, which separately satisfy the following relationship expressions: 0.80<|fS1/f|<1.40 and 1.30<|fS2/f|<1.80. The maximum resolution of the fixed-focus optical lens may reach 200 lp/mm, which may match 2.5 μm pixel chips. The maximum target size is 1.1 inches. At the same time, the lens also has a low distortion performance.

Inventors:
ZENG ZHENHUANG (CN)
LIN JIAMIN (CN)
LU SHENGLIN (CN)
Application Number:
PCT/CN2021/081735
Publication Date:
November 25, 2021
Filing Date:
March 19, 2021
Export Citation:
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Assignee:
OPT MACHINE VISION TECH CO LTD (CN)
International Classes:
G02B13/00
Foreign References:
CN111522126A2020-08-11
CN209690601U2019-11-26
CN102331618A2012-01-25
CN210348042U2020-04-17
JP2016038418A2016-03-22
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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