Image capturing optical lens assembly, image capturing device and mobile terminal

Abstract

An image capturing 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 an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The third lens element has refractive power. The forth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave or planar in a paraxial region thereof. The fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.

Description

RELATED APPLICATIONS[0001]This application claims priority to Taiwan Application Serial Number 103115378, filed Apr. 29, 2014, which is incorporated by reference herein in its entirety.BACKGROUND[0002]1. Technical Field[0003]The present disclosure relates to an image capturing optical lens assembly and an image capturing device. More particularly, the present disclosure relates to a compact image capturing optical lens assembly and an image capturing device applicable to mobile terminals.[0004]2. Description of Related Art[0005]In recent years, with the popularity of mobile terminals having camera functionalities, the demand of miniaturized optical systems has been increasing. The sensor of a conventional optical system is typically a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide-Semiconductor) sensor. As the advanced semiconductor manufacturing technologies have allowed the pixel size of sensors to be reduced and compact optical systems have gradually evolved tow...

AI Technical Summary

Benefits of technology

[0042]When a focal length of the image capturing optical lens assembly is f, a curvature radius of the object-side surface of the fifth lens element is R9, and a curvature radius of the image-side surface of the fifth lens element is R10, the following condition is satisfied: 1.20<(f / R10)−(f / R9). Therefore, it is favorable for reducing the back focal length of the image capturing optical lens assembly so as to allow sufficient arranging space under limited total track length. Preferably, the following condition is satisfied: 1.80<(f / R10)−(f / R9)<5.00.

[0044]When the focal length of the image capturing optical lens assembly is f, and the focal length of the fourth lens element is f4, the following condition is satisfied: 0.4<f / f4. Therefore, the photosensitivity of the image capturing optical lens assembly can be reduced to improve the manufacturability. Preferably, the following condition is satisfied: 0.75<f / f4<1.50.

[0045]When an axial distance between the fourth lens element and the fifth lens element is T45, and a central thickness of the fifth lens element is CT5, the following condition is satisfied: 1.1<T45 / CT5. Therefore, it is favorable for manufacturing and assembling the lens elements so as to increase the manufacturing yield rate. Preferably, the following condition is satisfied: 1.25<

Problems solved by technology

However, the conventional optical systems cannot satisfy these requirements of the compact optical systems.

However, it is not favorable for correcting to high-order aberration and manufacturing the lens elements, since the fourth lens element with positive refractive power usually has an image-side surface being convex which might result in excessively high curvature.

Moreover, it is unfavorable for arranging the lens elements under a compact optical system size which might lead to a worse image quality due to interference or stray light.

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