Lens

Abstract

The invention discloses a lens. The lens comprises a first lens group, a second lens group, a diaphragm, a third lens group, a fourth lens group, an optical filter and an image plane which are sequentially arranged from an object side to an image side, the positions of the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis; the lens group satisfies the following conditions: 1 < | (f3 * f3) / (f2 * f4) | (4, wherein f2 is the focal length of the second lens group, f3 is the focal length of the third lens group,and f4 is the focal length of the fourth lens group. In the embodiment of the invention, four lens groups are sequentially arranged in the lens from an object side to an image side according to a specific sequence. The positions of the first lens group and the third lens group are fixed, the second lens group and the fourth lens group can move along the optical axis to realize lens zooming, and the lens groups in the lens satisfy 1 < | (f3 * f3) / (f2 * f4) | (4, thereby realizing the super-starlight zoom lens.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a lens. Background technique [0002] In the intelligent transportation industry, because my country has perfect industry standards, standard 1-inch fixed-focus lenses such as 12mm, 16mm, 20mm, 25mm, 30mm, and 35mm are often used in actual construction, and the actual aperture value is 1.4-1.6. When installing a certain focal length lens When it is not suitable, it needs to be replaced, which is not very convenient to use. In addition, for foreign countries, their road standards are different from those of our country, or some countries do not have corresponding standards, and the focal length commonly used in actual construction is 20-40mm. At this time, using a fixed-focus lens cannot match the road scene well. . Since there is no super starlight zoom lens on the market that satisfies the three indicators of aperture value, focal length range, and 1.1-inch target surfa...

AI Technical Summary

Problems solved by technology

[0002] In the intelligent transportation industry, because my country has perfect industry standards, standard 1-inch fixed-focus lenses such as 12mm, 16mm, 20mm, 25mm, 30mm, and 35mm are often used in actual construction, and the actual aperture value is 1.4-1.6. When installing a certain focal length lens When it is not suitable, it needs to be replaced, which is not very convenient to use

In addition, for foreign countries, their road standards are different from those of our country, or some countries do not have corresponding standards, and the focal length commonly used in actual construction is 20-40mm. At this time, using a fixed-focus lens cannot match the road scene well.

Since there is no super starlight zoom lens on the market that satisfies the three indicators of aperture value, focal length range, and 1.1-inch target surface at the same time, it is necessary to develop a zoom lens that meets the requirements of these three types of specifications, which is convenient for intelligent traffic cameras at home and abroad. Use in the world, reduce foreign construction costs

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