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Optical lens group for capturing image

A technology of optical mirrors and lenses, applied in the field of miniaturized imaging optical mirror groups, can solve the problems of difficult manufacturing, difficulty in shortening the total optical length, and inability to meet the needs of photographic lens modules, and achieve the goal of maintaining thinness and shortening the total optical length Effect

Active Publication Date: 2012-09-05
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the pixel area of ​​the photosensitive element gradually shrinks and the system's requirements for imaging quality continue to increase, the common three-piece lens group can no longer meet the needs of higher-end photographic lens modules.
[0004] U.S. Patent No. 7,365,920 discloses a four-piece lens group, but wherein the first lens and the second lens are bonded with two glass spherical mirrors to form a Doublet to eliminate chromatic aberration, but this method has its disadvantages. First, too many configurations of glass spherical mirrors lead to insufficient freedom of the system, which makes it difficult to shorten the total optical length of the system; second, the manufacturing process of glass lens bonding is not easy, resulting in difficulties in manufacturing

Method used

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  • Optical lens group for capturing image
  • Optical lens group for capturing image
  • Optical lens group for capturing image

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0114] Please refer to the first embodiment of the present invention figure 1 , please refer to the aberration curve of the first embodiment figure 2 . The image-taking optical lens group of the first embodiment is mainly composed of four lenses, which in sequence from the object side to the image side include:

[0115] A first lens 110 with a positive refractive power, the object side surface 111 and the image side surface 112 are convex surfaces, the material is plastic, the object side surface 111 and the image side surface 112 of the first lens 110 are both aspherical;

[0116] A second lens 120 with negative refractive power, the object-side surface 121 is concave and the image-side surface 122 is convex, the material is plastic, the object-side surface 121 and the image-side surface 122 of the second lens 120 are both aspherical ;

[0117] A third lens 130 with negative refractive power, the object side surface 131 is concave and the image side surface 132 is convex,...

no. 2 example

[0144] Please refer to the second embodiment of the present invention image 3 , please refer to the aberration curve of the second embodiment Figure 4 . The image-taking optical lens group of the second embodiment is mainly composed of four lenses, which in sequence from the object side to the image side include:

[0145] A first lens 310 with positive refractive power, the object side surface 311 and the image side surface 312 are both convex surfaces, and the material is plastic, the object side surface 311 and the image side surface 312 of the first lens 310 are both aspherical;

[0146] A second lens 320 with negative refractive power, the object side surface 321 and the image side surface 322 are both concave surfaces, and the material is plastic, the object side surface 321 and the image side surface 322 of the second lens 320 are both aspherical;

[0147] A third lens 330 with negative refractive power, the object side surface 331 is concave and the image side surfa...

no. 3 example

[0168] Please refer to the third embodiment of the present invention Figure 5 , please refer to the aberration curve of the third embodiment Image 6 . The image-taking optical lens group of the third embodiment is mainly composed of four lenses, which in sequence from the object side to the image side include:

[0169] A first lens 510 with positive refractive power, the object side surface 511 and the image side surface 512 are both convex surfaces, the material is plastic, and the object side surface 511 and the image side surface 512 of the first lens 510 are both aspherical;

[0170] A second lens 520 with negative refractive power, the object side surface 521 and the image side surface 522 are both concave, and the material is plastic, the object side surface 521 and the image side surface 522 of the second lens 520 are both aspherical;

[0171] A third lens 530 with negative refractive power, the object side surface 531 is concave and the image side surface 532 is co...

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Abstract

The invention discloses an optical lens group for capturing images, successively comprising a first lens with positive flexion force, a second lens with negative flexion force, a third lens, a four lens and an aperture from an object side to an image side, wherein the object side surface of the first lens is a convex side; the image side surface of the second lens is a convex side; the object side surface of the third lens is a concave side, the image side surface of the third lens is a convex side, at least one of the object side surface and the image side surface of the third lens is an aspheric surface; the image side surface of the fourth lens is a concave side, at least one of the object side surface and the image side surface of the fourth lens is provided with at least one inflection point; the aperture is arranged between a shot object and the first lens; the distance between the first lens and the second lens on an optical axis is T12, the focal length of the integral optical lens group for capturing images is f, the dispersion coefficient of the first lens is V1, the dispersion coefficient of the third lens is V3, and all coefficients satisfy the following relational expressions: (T12 / f)*100 is less than 20 and more than 0.5, and V1-V3 is more than 23; and the optical lens group for capturing images only comprises the above four lens with flexion force. The optical lens group for capturing images can effectively improve the imaging quality of the system and is thin.

Description

technical field [0001] The present invention relates to an image-taking optical lens group; in particular, to a miniaturized image-taking optical lens group applied to a mobile phone camera. Background technique [0002] In recent years, with the rise of mobile phone cameras, the demand for miniaturized photographic lenses is increasing day by day, and the photosensitive elements of general photographic lenses are nothing more than Charge Coupled Device (CCD) or Complementary Metal Oxide Semiconductor (Complementary) Metal-Oxide Semiconductor Sensor, CMOS Sensor), and due to the progress of semiconductor manufacturing technology, the pixel area of ​​the photosensitive element has been reduced, and the miniaturized photographic lens has gradually developed to the high-pixel field. Therefore, the requirements for image quality are also increasing. [0003] Traditionally, the photographic lenses mounted on mobile phone cameras mostly use a three-piece lens structure. The lens s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00
Inventor 汤相岐蔡宗翰
Owner LARGAN PRECISION
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