Zoom optical system with high resolution, small distortion, small volume and large image surface

Abstract

The invention discloses a zoom optical system with high resolution, small distortion, small volume and large image surface. The zoom optical system is characterized in that a photosensitive chip converting light rays into electrical signals is included, a first lens group, a third lens group and a fifth lens group which can be fixed relative to the photosensitive chip are arranged on one side of the photosensitive chip, a fourth lens group which can move relative to the photosensitive chip is arranged between the third lens group and the fifth lens group, and a second lens group is arranged between the first lens group and the third lens group; and the first lens group has a positive focal length, the third lens group has a positive focal length, the fourth lens group has a positive focallength, the second lens group and the fifth lens group have negative focal lengths, and an aperture controlling the amount of light beams entering the lenses is arranged between the second lens groupand the third lens group. According to the zoom optical system with high resolution, small distortion, small volume and large image surface, the lens transmittance is high, the zoom optical system canbe used in a variety of environments, the imaging effect is good, and the whole picture is clear in the presence of a plurality of bands.

Description

【Technical field】 [0001] The invention relates to a zoom optical system, in particular to a zoom optical system with high resolution, small distortion, small volume and large image plane applied to a monitoring system. 【Background technique】 [0002] At present, zoom lenses are widely used in people's daily life. The current market is developing in the direction of high resolution and high image quality. In order to obtain better imaging quality, using chips with larger pixels and more pixels is the solution to the problem. One of the fundamental ways, but the current security monitoring and road condition monitoring devices have the following shortcomings: [0003] 1. Ordinary zoom lenses are often not compatible with the large image area and volume. The increase of the image area will also cause a sharp change in the lens volume. Currently, large-screen surveillance lenses on the market, such as lenses with a chip size of about 1.7″, have an image area If the size reaches...

AI Technical Summary

Problems solved by technology

[0003] 1. Ordinary zoom lenses are often not compatible with the large image area and volume. The increase of the image area will also cause a sharp change in the lens volume. Currently, large-screen surveillance lenses on the market, such as lenses with a chip size of about 1.7″, have an image area If the size reaches 9.5mm, it is mostly a fixed-focus lens, which is difficult to control when the monitoring distance changes, and the length is longer, usually greater than 70mm;

[0004] 2. The resolution is low. Currently, most of the high-quality surveillance cameras on the market have a resolution of 1080p and a pixel count of 2 million. However, with the improvement of data transmission speed, higher-quality picture transmission becomes possible. 2 million pixels can no longer meet the demand

The current mainstream 1080P lens image plane is mainly 1 / 2.8″, using a 1 / 2.8″ CMOS chip with an effective imaging plane diagonal of 6.2mm, its pixel size is only 2.8μm, and the resolution is not very high

Moreover, due to the small pixels, its photosensitivity and color reproduction performance are not very ideal, and performance improvement is urgently needed;

[0005] 3. The current monitoring lens on the market basically has a large change in lens optical distortion under different focal lengths, which is not conducive to the realization of artificial intelligence related fields such as face recognition and license plate recognition that are gradually becoming popular;

[0006] 4. The surveillance lenses currently on the market are basically non-infrared confocal lenses. Therefore, in occasions with many optical wavelength bands such as evening, or when there is some lighting at night, the captured picture cannot be clear as a whole, and there will always be some blur

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