Prime lens
By coordinating the optical power of four lenses and designing aspherical and diffraction surfaces, the aperture position is optimized, solving the problem of small aperture of existing 4mm fixed-focus lenses, and realizing a compact fixed-focus lens with a large aperture of F1.4, which is suitable for security monitoring.
CN223389973UInactive Publication Date: 2025-09-26DONGGUAN YUTONG OPTICAL TECH
0 Cites 2 Cited by
Patent Information
- Application Number
- CN202422947639.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-09-26
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Technical Problem
The existing 4mm fixed-focus lens has a small aperture and a large number of lenses, making it difficult to achieve a large aperture and compact structure design, and cannot meet the imaging requirements of security monitoring.
Method used
It adopts a four-lens design, through the coordination of optical power and aspheric and diffraction surface design, combined with the optimization of the aperture position, to achieve a large aperture F1.4 fixed-focus lens with a compact structure and clear imaging.
Benefits of technology
The large aperture F1.4 fixed-focus lens has a compact structure, meets the imaging requirements of security monitoring, and is suitable for 1/2.7″ sensor chips, reducing manufacturing costs and difficulty.
✦ Generated by Eureka AI based on patent content.
Abstract
The embodiment of the utility model discloses a prime lens, which comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object space to an image space along an optical axis, the first lens has negative focal power, the second lens has positive focal power, the third lens has positive focal power, and the fourth lens has negative focal power; the object space surfaces and the image space surfaces of the first lens, the third lens and the fourth lens are aspheric surfaces; the object-side surface of the second lens is an aspheric surface, and the image-side surface is a binary diffraction surface. In the embodiment of the utility model, the four optical lenses are adopted, and the focal power of each lens element and the relative position of each lens element are optimized, so that the design of the prime lens which is large in aperture, compact in structure and capable of meeting the imaging requirement is finally realized; the aperture of the prime lens is 1.4, the total optical length is not larger than 22.5 mm, the prime lens can be matched with a 1 / 2.7 ''sensor chip, and the comprehensive performance of the prime lens can meet the use requirement of a general sensor for security and protection monitoring.
Need to check novelty before this filing date? Find Prior Art