Zoom optical system

Abstract

The invention discloses a zoom optical system. The zoom optical system comprises a light sensing chip (30), wherein a first lens group (10) capable of moving relative to the light sensing chip is arranged on one side of the light sensing chip (30); a second lens group (20) capable of moving relative to the light sensing chip (30) is arranged between the first lens group (10) and the light sensing chip (30); a diaphragm (40) fixed relative to the position of the light sensing chip (30) is arranged between the second lens group (20) and the first lens group (10); in the changing process of the zoom optical system from a short focal distance to a long focal distance, the first lens group (10) and the second lens group (20) get close towards the diaphragm (40) gradually; and moreover, the integral focal distance of the first lens group (10) is negative, and the integral focal distance of the second lens group (20) is positive. The zoom optical system is small in size, large in image plane and high in resolution ratio.

Description

【Technical field】 [0001] The invention relates to a zoom optical system. 【Background technique】 [0002] At present, with the needs of the surveillance market, the lens has begun to develop in the direction of high resolution and high image quality. In order to obtain better imaging quality, the use of chips with larger pixels is the future development direction. [0003] Currently, most of the mainstream surveillance cameras on the market have a resolution of 1080p and a pixel count of 1920*1080. However, with the development of 4G networks, 4K photosensitive chips and 4K display systems, higher image quality image transmission becomes possible, and At present, there are fewer types of high-pixel lenses, and the cost is relatively high. [0004] In addition, the large-screen surveillance lenses currently on the market, such as lenses of about 1 inch, have an image size of 16.0mm, but they are relatively large in size, inconvenient to use, and incompatible with many surveil...

AI Technical Summary

Problems solved by technology

[0003] Currently, most of the mainstream surveillance cameras on the market have a resolution of 1080p and a pixel count of 1920*1080. However, with the development of 4G networks, 4K photosensitive chips and 4K display systems, higher image quality image transmission becomes possible, and At present, there are fewer types of high-pixel lenses, and the cost is higher

[0004] In addition, the large-screen surveillance lenses currently on the market, such as lenses of about 1 inch, have an image size of 16.0mm, but they are relatively large in size, inconvenient to use, and incompatible with many surveillance devices.

[0005] Furthermore, most of the surveillance lenses currently on the market are non-infrared confocal lenses. Therefore, in occasions with many optical wavelength bands, such as in the evening, or when there are some lights at night, the captured pictures cannot be clear as a whole, and there will always be partial blurs.

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