A high-resolution day and night fisheye lens and its focusing method

Abstract

The invention relates to a high-resolution fisheye lens for day and night use. The high-resolution fisheye lens is characterized in that an optical assembly of the lens comprises a front lens group A with negative focal power and a rear lens group B with negative focal power which are arranged sequentially from left to right along the incident direction of light. The front lens group A is provided with a negative meniscus lens A-1, a plastic aspheric lens A-2 and a positive meniscus lens A-3 sequentially from left to right. The rear lens group B is provided with a plastic aspheric lens B-1 and a double-concave lens cemented group B-2 sequentially from left to right. The centers of the negative meniscus lens A-1, the plastic aspheric lens A-2, the positive meniscus lens A-3, the plastic aspheric lens B-1 and the double-concave lens cemented group B-2 are on the optical axis of light. The high-resolution fisheye lens of the invention has the advantages of compact structure, small size and low weight, and can be used both in the day and at night.

Description

technical field [0001] The invention relates to the field of optics, in particular to a high-resolution day-night fisheye lens and a focusing method thereof. Background technique [0002] With the expansion of the optical material library and the enhancement of social security awareness, the security monitoring market has been rapidly expanded, and the performance of security products has also shown diversified changes. Nowadays, with the continuous maturity of advanced video compression coding technology, the rapid development of IP-based network transmission and the application of digital zoom technology, a series of high-definition cameras with 3 million and 5 million pixels have been launched on the market. The fisheye lens can meet the needs of 360-degree panoramic monitoring, but its distortion is so large that the edge magnification is low, which affects the edge image clarity. [0003] Small TV surveillance cameras have a history of 20 to 30 years since their appear...

AI Technical Summary

Problems solved by technology

The fisheye lens can meet the needs of 360-degree panoramic monitoring, but its distortion is so large that the edge magnification is low, which affects the edge image clarity

[0003] Small TV surveillance cameras have a history of 20 to 30 years since their appearance. After years of innovation and development, they have formed different series of miniature camera lenses of various specifications and models for use with them. However, the performance indicators of these lenses vary, and most of them belong to Low-end products have low performance indicators and are only suitable for ordinary cameras with megapixels; the amount of image distortion is large, the difference between image distortion and the real scene becomes larger, the authenticity is poor, the edge resolution is not enough, and the cost is high

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