Focus adjusting optical lens assembly

Abstract

A focus adjusting optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element has refractive power. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface. The fifth lens element has a concave image-side surface at a paraxial region, wherein the image-side surface of the fifth lens element changes from concave at the paraxial region to convex at a peripheral region, and both of an object-side surface and the image-side surface of the fifth lens element are aspheric. In switching of remote photographing and close photographing, focus adjustiment is executed by means of adjusting a spacing distance between the first lens and the second lens on the optical axis. The focusing problem in remote photographing and close photographing can be improved when specific conditions are satisfied, and the characteristics of small size and low power can be achieved at the same time.

Description

Technical field [0001] The invention relates to a mobile focusing optical lens group, in particular to a miniaturized mobile focusing optical lens group applied to electronic products. Background technique [0002] As personal electronic products become thinner and lighter, the size of the internal components of the product also needs to be reduced, especially in the volume of the camera lens module. Generally speaking, due to space constraints, it is difficult for miniaturized lenses to meet the needs of both long and close shots. For example, the five-element lens group disclosed in US Patent No. 7,864,454 is a moving focus mode for the entire lens group, and its focal depth at close-up is limited, which easily blurs surrounding images and causes image quality defects. [0003] In addition, generally, a photographic lens with a focus adjustment function can be adjusted by software, such as Extended Depth of Field (EDoF, Extended Depth of Field), which uses the color of the best ...

AI Technical Summary

Problems solved by technology

Generally speaking, due to space constraints, it is difficult for miniaturized lenses to meet the needs of both telephoto and close-up shots

For example, the five-element lens group disclosed in U.S. Patent No. 7,864,454 is a moving focus mode of the entire lens group, and its focal depth is limited in close-up shots, which tends to blur peripheral images and cause image quality defects

[0003] In addition, for photographic lenses with adjustable focus functions, the focus adjustment method can be processed by software, such as Extended Depth of Field technology (EDoF, Extended Depth of Field) uses the color of the best light shape at the current distance as the main axis light Then use digital simulation to achieve the focusing effect, or use the voice coil motor (Voice Coil Motor, VCM) to change the relative distance between the overall photographic lens and the image sensor to achieve the focusing effect, but the above two methods have image quality degradation and consumption. Problems such as excessive power

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