Zoom lens

A zoom lens and lens technology, applied in the field of zoom lenses, can solve the problems of poor transfer function control, poor low-light characteristics, and small field of view angle span, and achieves strong switching flexibility, good color reproduction, and field of view. The effect of large angular span

Pending Publication Date: 2019-10-18
XIAMEN LEADING OPTICS
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  • Description
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Problems solved by technology

[0004] However, the zoom lenses currently used in the field of security monitoring still have the following defects: the light transmission is small, the low-light characteristics are not good, and clear color images cannot be realized in the case of poor light; the transfer function is not well controlled, and the resolution Low, low resolution, poor image sha...

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Embodiment Construction

[0079] To further illustrate the various embodiments, the present invention is provided with accompanying drawings. These drawings are a part of the disclosure of the present invention, which are mainly used to illustrate the embodiments, and can be combined with related descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should understand other possible implementations and advantages of the present invention. Components in the figures are not drawn to scale, and similar component symbols are generally used to denote similar components.

[0080] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0081] The term "a lens has a positive refractive power (or negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optics theory is positive (or negative). The so-called...

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Abstract

The invention relates to the technical field of lenses, and discloses a zoom lens. The zoom lens is provided with twelve lenses; the first to fourth lenses form a focusing lens group; the fifth to twelfth lenses form a zoom lens group; a diaphragm is arranged between a compensation lens group and the zoom lens group, and correspondingly limits the refractive indexes and the surface shapes of the first to twelfth lenses; and at least two lenses in the first to twelfth lenses are glued with each other. The zoom lens has the advantages that the light transmission is high, the minimum value of theaperture reaches 1.4, the control of a transfer function is good, the resolution is high, the span of a focal length section is large, the span of a field angle is large, the infrared confocal performance is good, and the color difference control is relatively good in visible light.

Description

technical field [0001] The invention belongs to the technical field of lenses, and in particular relates to a zoom lens. Background technique [0002] With the continuous advancement of technology, optical imaging lenses have also developed rapidly in recent years, and are widely used in various fields such as smart phones, tablet computers, video conferencing, security monitoring, etc. Therefore, the requirements for optical imaging lenses are also increasing. high. [0003] A zoom lens is a camera lens that can change the focal length within a certain range to obtain different wide and narrow field of view angles, images of different sizes and different scene ranges. The zoom lens can change the shooting range by changing the focal length without changing the shooting distance, so it is very convenient to use. [0004] However, the zoom lenses currently used in the field of security monitoring still have the following defects: the light transmission is small, the low-lig...

Claims

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Application Information

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IPC IPC(8): G02B15/16
Inventor 张军光王世昌郑毅
Owner XIAMEN LEADING OPTICS
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