Optical lens group

Abstract

The invention relates to an optical lens group. The object side of the first lens includes a convex surface located in the area near the circumference; the second lens has negative refractive power; the object side of the third lens includes a concave surface located in the area near the circumference. and the image side of the fourth lens includes a convex portion located in the vicinity of the circumference; wherein, the optical lens group satisfies the following relationship: HFOV≦25°; TTL≦8mm; and TL / G23≦4.5; HFOV stands for optical lens Half angle of view of the group, TTL represents the distance from the object side of the first lens to an imaging surface on the optical axis, TL represents the distance from the object side of the first lens to the image side of the fifth lens on the optical axis, G23 represents the distance of the first lens An air gap width on the optical axis between the second lens and the third lens. The optical lens group of the present invention can maintain good optical performance and effectively shorten the lens length by controlling the arrangement of concave and convex curved surfaces of each lens.

Description

technical field [0001] The present invention relates to an optical lens set, and in particular to an optical lens set using at least four lenses. Background technique [0002] In recent years, the popularity of portable electronic products such as mobile phones, digital cameras, tablet computers, and personal digital assistants (Personal Digital Assistant, referred to as PDA) has led to the vigorous development of image modules including optical imaging lenses, module backseat units, and image sensors. The thinness and lightness of portable electronic products also increase the miniaturization requirements of image modules. ) technological progress and size reduction, the optical lens group installed in the image module also needs to be reduced in size, but the good optical performance of the optical lens group is also necessary to take into account. [0003] Since the size of the traditional miniature telephoto lens exceeds 50mm and the number of f-stops exceeds 4, it is o...

AI Technical Summary

Problems solved by technology

[0003] Since the size of the traditional miniature telephoto lens exceeds 50mm and the number of f-stops exceeds 4, it is obviously unable to meet the specifications of existing portable electronic products. Good image quality and small lens space are required, and the improvement of the aperture size is also a subject that must be considered

However, the design of optical imaging lens is not simply to scale down the lens with good imaging quality to produce an optical lens group with both imaging quality and miniaturization. The design process involves material properties, and must also take into account the production and assembly yield. Due to practical problems in production, the technical difficulty of miniaturized lenses is obviously higher than that of traditional lenses

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