Zoom Lens Aberration Control via Multi-Group Movement

The lens is divided into four distinct lens groups (positive, negative, negative, positive) with specific movement characteristics. The first and second lens groups move during zooming, while the third and fourth lens groups remain stationary, creating a segmented structure that achieves high zoom ratio while controlling weight through strategic placement and movement of only necessary components.

The lens configuration employs dynamic movement of specific lens groups during zooming operation. The first lens group moves toward the image side during zooming from wide-angle to telephoto end, and the second lens group also moves, while the third and fourth lens groups remain stationary. This dynamic allocation of movement to specific groups optimizes the zoom mechanism efficiency and reduces overall system weight.

The lens is segmented into four groups with alternating positive and negative refractive powers. The first lens group (positive) and second lens group (negative) are designed to move during zooming, while the third lens group (negative) and fourth lens group (positive) remain stationary. This segmentation allows the moving groups to handle zoom function while stationary groups provide stable optical reference points, reducing spherical aberration fluctuation.

Different lens groups are assigned different refractive powers and movement characteristics based on their local optical functions. The first lens group has positive refractive power and moves toward the image side during zooming, while the second lens group has negative refractive power and also moves. The third and fourth lens groups have negative and positive refractive powers respectively and remain stationary. This localized optimization of optical properties and movement behavior corrects spherical aberration at each stage of zooming.

The lens is divided into four functional groups with specific refractive powers and movement characteristics. This segmentation allows for optimized weight distribution where only the first and second lens groups move during zooming, reducing the weight of moving components while maintaining high optical performance through the coordinated action of all four groups including the stationary third and fourth groups.

The lens configuration specifies precise parameter relationships including the focal length of the image side negative lens group (fN) relative to the focal length at wide-angle end (fw) through Conditional Expression (1). These parameter optimizations ensure high optical performance is achieved with the minimized lens structure, balancing weight reduction with performance maintenance.