Zoom lens

Abstract

The invention discloses a zoom lens which comprises a first fixed lens group, a zoom lens group, a second fixed lens group, a focusing lens group and an optical filter which are sequentially arranged from an object side to an image side along an optical axis. During focusing, the zoom lens group and the focusing lens group respectively move along the optical axis, and the zoom lens further satisfies the following conditions that 1.32 <= FA / FC <= 1.97, -0.9 <= FB / FC <= -0.18, 0 <= FD / FC <= 1.1, wherein FA is the focal length of the first fixed lens group, FB is the focal length of the zoom lens group, FC is the focal length of the second fixed lens group, and FD is the focal length of the focusing lens group. The lens has excellent confocal imaging capability under visible light and infrared light, has a temperature compensation function, does not need to focus again during day and night switching, is clear in imaging, small in size, large in image plane, wide in application range and low in cost, and can be matched with various types of camera equipment to meet various the use requirements.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and in particular relates to a zoom lens. Background technique [0002] With the development of AI face recognition technology, the zoom lens is conducive to further improving the development and application space in this field. However, in the field of AI face recognition, it needs to be based on clearer images to achieve its excellent recognition accuracy and processing efficiency. Therefore, higher requirements are put forward for the aperture, image plane, resolution, infrared performance and high and low temperature performance of the camera lens. However, the currently used lenses generally have the following shortcomings: small aperture, which cannot meet the brightness requirements of images in low-light environments; large image area and small size cannot be balanced, and cannot meet the space requirements of the lens; low resolution, the current mainstream 1080P lens , the reso...

AI Technical Summary

Problems solved by technology

However, the currently used lenses generally have the following shortcomings: small aperture, which cannot meet the brightness requirements of images in low-light environments; large image area and small size cannot be balanced, and cannot meet the space requirements of the lens; low resolution, the current mainstream 1080P lens , the resolution is 2 million, which obviously cannot meet the high-pixel requirements of face recognition; the infrared performance and high and low temperature performance cannot be taken into account, and the high and low temperature performance is often sacrificed to meet the day and night confocal requirements, which cannot meet the high and low temperature environment. Face recognition requires real-time performance, making it difficult to guarantee stable performance

Images