Optical image acquiring lens group

A mirror and optical technology, which is applied in the field of miniaturized optical imaging lens group, can solve the problems of difficult glass lens manufacturing process, inability to meet the needs of photographic lens modules, and difficulty in shortening the total optical length, so as to shorten the total optical length and reduce the system cost. Sensitivity, the effect of reducing sensitivity

Active Publication Date: 2012-05-23
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the pixel area of ​​the photosensitive element is gradually reduced, and the system's requirements for imaging quality continue to increase, the existing three-piece lens group will not be able to 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 to each other by two glass spherical mirrors to form a doublet lens (Doublet) to eliminate chromatic aberration, but this method It has its disadvantages. First, too many glass spherical mirror configurations lead to insufficient system freedom, 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

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Examples

Experimental program
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no. 1 example

[0097] Please refer to the schematic diagram of the optical system of the first embodiment of the present invention Figure 1A , for the aberration curve of the first embodiment, please refer to Figure 1C . The optical imaging lens group of the first embodiment is mainly composed of four lenses, which sequentially include from the object side to the image side:

[0098] A first lens 110 with positive refractive power, its object-side surface 111 and image-side surface 112 are convex, its material is glass, the object-side surface 111 and image-side surface 112 of the first lens 110 are both aspherical ;

[0099] A second lens 120 with negative refractive power, its object side surface 121 is convex and image side surface 122 is concave, its material is plastic, the object side surface 121 and image side surface 122 of the second lens 120 are both aspherical , and the object-side surface 121 of the second lens 120 is provided with at least one inflection point;

[0100] A t...

no. 2 example

[0128] Please refer to the schematic diagram of the optical system of the second embodiment of the present invention Figure 2A , for the aberration curve of the second embodiment, please refer to Figure 2C . The optical imaging lens group of the second embodiment is mainly composed of four lenses, which include sequentially from the object side to the image side:

[0129] A first lens 210 with positive refractive power, its object-side surface 211 and image-side surface 212 are convex, its material is plastic, the object-side surface 211 and image-side surface 212 of the first lens 210 are both aspherical ;

[0130] A second lens 220 with negative refractive power, its object side surface 221 is convex and image side surface 222 is concave, its material is plastic, the object side surface 221 and image side surface 222 of the second lens 220 are both aspherical , and the object-side surface 221 of the second lens 220 is provided with at least one inflection point;

[013...

no. 3 example

[0153] Please refer to the schematic diagram of the optical system of the third embodiment of the present invention Figure 3A , for the aberration curve of the third embodiment, please refer to Figure 3C . The optical imaging lens group of the third embodiment is mainly composed of four lenses, which sequentially include from the object side to the image side:

[0154] A first lens 310 with positive refractive power, its object-side surface 311 and image-side surface 312 are convex, its material is glass, the object-side surface 311 and image-side surface 312 of the first lens 310 are both aspherical ;

[0155] A second lens 320 with negative refractive power, its object side surface 321 is convex and image side surface 322 is concave, its material is plastic, the object side surface 321 and image side surface 322 of the second lens 320 are both aspherical , and the object-side surface 321 of the second lens 320 is provided with at least one inflection point;

[0156] A ...

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Abstract

The invention discloses an optical image acquiring lens group sequentially comprising a first lens of positive refractive power, a second lens of negative refractive power, a third lens, a fourth lens, a first diaphragm and a second diaphragm from an object side to an image side, wherein the surface of the object side of the first lens is a convex side; the surface of the object side of the second lens is a convex side, and the surface of the image side of the second lens is a concave side; the surface of the image side of the third lens is a convex side, and the part of the surface of the image side of the third lens at the periphery of a lens in an effective diameter inclines towards the image side; the surface of the image side of the fourth lens is a concave side; the first diaphragm is arranged between a shot object and the first lens; and the second diaphragm is arranged between the second lens and the fourth lens. Through the lens group configuration way, the total length of the lens can be effectively shortened, the system sensitivity can be lowered, and favorable imaging quality can be obtained.

Description

technical field [0001] The invention relates to an optical imaging mirror group, in particular to a miniaturized optical imaging mirror group applied to portable electronic products. Background technique [0002] In recent years, with the vigorous development of miniaturized photographic lenses, the demand for miniature imaging modules is increasing day by day, and the photosensitive elements of general photographic lenses are nothing more than charge coupled devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductors. There are two types of components (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and with the improvement of semiconductor manufacturing process technology, the pixel size of the photosensitive element is reduced, and today's electronic products are developed with good functions and thin, light and small appearance. Therefore, the miniaturized optical imaging lens group with good imaging quality has become the mainstream in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18G02B13/22G02B1/04
Inventor 黄歆璇
Owner LARGAN PRECISION
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