Photographing optical lens, image capturing device and electronic device

Abstract

A photographing optical lens 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, a fifth lens element and a sixth lens element. The first lens element has positive refractive power. The second lens element, the third lens element, and the fourth lens element have refractive power. The fifth lens element with negative refractive power has an aspheric object-side surface and an aspheric image-side surface being concave in a paraxial region thereof. The sixth lens element with negative refractive power has an aspheric object-side surface being concave in a paraxial region thereof and an aspheric image-side surface being concave in a paraxial region thereof, wherein the image-side surface thereof has at least one inflection point. The photographing optical lens further includes a stop located between an object and the second lens element.

Description

RELATED APPLICATIONS[0001]This application claims priority to Taiwan Application Serial Number 103122671, filed Jul. 1, 2014, which is herein incorporated by reference.BACKGROUND[0002]1. Technical Field[0003]The present disclosure relates to a photographing optical lens. More particularly, the present disclosure relates to a compact photographing optical lens applicable to electronic devices.[0004]2. Description of Related Art[0005]In recent years, with the popularity of electronic devices 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 toward the field of higher megapixels, there is an increasing demand for compact optical systems fe...

AI Technical Summary

Benefits of technology

[0008]According to one aspect of the present disclosure, a photographing optical lens 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, a fifth lens element and a sixth lens element. The first lens element has positive refractive power. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. An object-side surface and the image-side surface of the fifth lens element are aspheric. The sixth 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. The object-side surface and the image-side surface of the sixth lens element are aspheric, and the image-side surface of the sixth lens element has at least one inflection point. The photographing optical lens has a total of six lens elements with refractive power. The photographing optical lens further includes a stop, and the stop is located between an object and the second lens element. When a focal length of the photographing optical lens is f, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a curvature radius of an image-side surface of the third lens element is R6, a curvature radius of the image-side surface of the fifth lens element is R10, and a curvature radius of the object-side surface of the sixth lens element is R11, the following relationships are satisfied:

Problems solved by technology

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

However, the refractive power and the surface shape of the lens elements are not favorable for enhancing the diverging ability at the image side and reducing the back focal length of the optical system.

Furthermore, the converging intensity at the optical axis cannot be moderated for enhancing the image sharpness.

Accordingly, it is not favorable for keeping the optical system compact and enhancing the image quality.

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