Optical imaging lens

CN119471944APending Publication Date: 2025-02-18ZHEJIANG SUNNY OPTICAL CO LTD
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Patent Information

Application Number
CN202411815431.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-02-18

AI Technical Summary

Technical Problem

The four-piece optical imaging lens in the prior art has poor assembly stability due to unreasonable lens size, which affects imaging quality and system safety.

Method used

An optical imaging lens is designed, including a lens barrel, a four-piece lens group and at least one spacer. The lens group consists of a first lens, a second lens, a third lens and a fourth lens, and the spacer is located between the first lens and the second lens and is in contact with an image side portion of the first lens. By controlling the ratio between the maximum axial thickness CP1 of the spacer, the central thickness CT1 of the first lens, and the air space T12, it is ensured that it is within the range of 2.02≤CP1/(CT1+T12)≤2.75.

Benefits of technology

By rationally arranging the lenses and spacers, the size of the front-end structure is optimized, the system sensitivity is reduced, the assembly stability is increased, the imaging quality is improved, and the overall performance of the optical imaging lens is improved.

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Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and at least one spacer, the lens group and the spacer are arranged in the lens barrel, the lens group is composed of four lenses, and the four lenses are sequentially a first lens, a second lens, a third lens and a fourth lens from the object side to the image side; the at least one spacer includes a first spacer located between the first lens and the second lens and in contact with an image-side surface portion of the first lens; wherein the maximum axial thickness CP1 of the first spacer, the center thickness CT1 of the first lens on the optical axis, and the air interval T12 of the first lens and the second lens on the optical axis meet the condition that CP1 / (CT1 + T12) is larger than or equal to 2.02 and smaller than or equal to 2.75. According to the invention, the problem of poor assembly stability caused by unreasonable lens size of a four-piece optical imaging lens in the prior art is solved.
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