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Photographing lens system, image capturing device and electronic terminal

a technology of image capture and lens system, applied in the field of photographing lens system and image capture device, can solve the problems of image distortion, difficulty in miniaturization, and inability of conventional optical systems to meet the requirements of compact optical systems with a wide field of view

Active Publication Date: 2016-05-05
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes how to improve the performance of a photographing lens system by adjusting the shape of a fourth lens element. By satisfying certain conditions, the lens system can correct aberration, improve manufacturability, and reduce photosensitivity. Additionally, by satisfying specific conditions, the lens system can increase manufacturing yield rate and assembly efficiency.

Problems solved by technology

However, the conventional optical systems cannot satisfy these requirements of the compact optical systems with a wide field of view.
However, the refractive power of the lens elements, which is favorable for enlarging the field of view, might lead to problems of image distortion, vignetting at the periphery of the image and difficulty for miniaturizing.

Method used

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  • Photographing lens system, image capturing device and electronic terminal
  • Photographing lens system, image capturing device and electronic terminal
  • Photographing lens system, image capturing device and electronic terminal

Examples

Experimental program
Comparison scheme
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1st embodiment

[0064]FIG. 1 is a schematic view of a photographing lens system according to the 1st embodiment of the present disclosure. FIG. 2 shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens system according to the 1st embodiment.

[0065]In FIG. 1, the image capturing device includes the photographing lens system (its reference numeral is omitted) of the present disclosure and an image sensor 190. The photographing lens system includes, in order from an object side to an image side, a first lens element 110, a second lens element 120, an aperture stop 100, a third lens element 130, a fourth lens element 140, a fifth lens element 150, an IR-cut filter 160, a cover glass 170 and an image surface 180. The image sensor 190 is disposed on the image surface 180 of the photographing lens system. The photographing lens system has a total of five lens elements (110-150) with refractive power. Moreover, there is an air...

2nd embodiment

[0090]FIG. 3 is a schematic view of a photographing lens system according to the 2nd embodiment of the present disclosure. FIG. 4 shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens system according to the 2nd embodiment.

[0091]In FIG. 3, the image capturing device includes the photographing lens system (its reference numeral is omitted) of the present disclosure and an image sensor 290. The photographing lens system includes, in order from an object side to an image side, a first lens element 210, a second lens element 220, an aperture stop 200, a third lens element 230, a fourth lens element 240, a fifth lens element 250, an IR-cut filter 260, a cover glass 270 and an image surface 280. The image sensor 290 is disposed on the image surface 280 of the photographing lens system. The photographing lens system has a total of five lens elements (210-250) with refractive power. Moreover, there is an air...

3rd embodiment

[0102]FIG. 5 is a schematic view of a photographing lens system according to the 3rd embodiment of the present disclosure. FIG. 6 shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the photographing lens system according to the 3rd embodiment.

[0103]In FIG. 5, the image capturing device includes the photographing lens system (its reference numeral is omitted) of the present disclosure and an image sensor 390. The photographing lens system includes, in order from an object side to an image side, a first lens element 310, a second lens element 320, an aperture stop 300, a third lens element 330, a fourth lens element 340, a fifth lens element 350, an IR-cut filter 360, a cover glass 370 and an image surface 380. The image sensor 390 is disposed on the image surface 380 of the photographing lens system. The photographing lens system has a total of five lens elements (310-350) with refractive power. Moreover, there is an air...

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Abstract

A photographing lens system 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 negative refractive power has a concave image-side surface. The second lens element has refractive power. The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The fourth lens element with negative refractive power has a concave image-side surface, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric. The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface, wherein the object-side surface and the image-side surface of the fifth lens element are aspheric.

Description

RELATED APPLICATIONS[0001]This application claims priority to Taiwan Application Serial Number 103137652, filed Oct. 30, 2014, which is incorporated by reference herein in its entirety.BACKGROUND[0002]1. Technical Field[0003]The present disclosure relates to a photographing lens system and an image capturing device. More particularly, the present disclosure relates to a compact photographing lens system with a wide field of view and an image capturing device which is applicable to electronic 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 gradual...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B9/60
CPCG02B9/60G02B13/0045
Inventor HSU, CHIH-WENCHEN, WEI-YU
Owner LARGAN PRECISION
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