A zoom lens

By using a two-element zoom lens design, combining negative and positive power lenses with a triple-ceramic lens group, the problems of large aperture, miniaturization, and infrared confocal imaging in existing zoom lenses have been solved, achieving high-definition and stable all-weather imaging.

CN121454750BActive Publication Date: 2026-07-14DONGGUAN YUTONG OPTICAL TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGGUAN YUTONG OPTICAL TECH
Filing Date
2025-12-18
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing zoom lenses face challenges in meeting the requirements of high resolution, large aperture, miniaturization, and infrared confocal focus. They are particularly deficient in terms of large lens size, high cost, and lack of infrared confocal focus, making it difficult to meet the comprehensive needs of modern security monitoring.

Method used

The zoom lens design employs a two-element structure, including a focusing lens group and a zoom lens group. The lens combination uses negative and positive power lenses, combined with an aperture stop and a triplex lens group, to achieve a large aperture, high definition, and infrared confocal focus.

Benefits of technology

A large aperture was achieved without increasing the lens barrel diameter, meeting the requirements of high definition and infrared confocal imaging. The lens is miniaturized, the image quality is stable, and it is suitable for all-weather monitoring.

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Abstract

The application discloses a zoom lens, which comprises, in sequence along an optical axis from an object plane to an image plane, a focusing lens group, a diaphragm and a zoom lens group, the focusing lens group has negative refractive power, the zoom lens group has positive refractive power, the focusing lens group comprises a first lens, a second lens and a third lens, the zoom lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, and the zoom lens group comprises at least one three-cemented lens group. The zoom lens provided by the embodiment of the application adopts a two-group-element structure, uses nine lenses, sets the number of lenses in the two lens groups, further limits the refractive power matching of the two lens groups and the nine lenses, and uses a three-cemented lens group after the diaphragm, so that the zoom lens meets the use requirements of a large aperture, high definition, small size and infrared confocal under a 1 / 2.7'' target surface and in a 436nm-850nm waveband.
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