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Photographic lens system

A photographic lens and lens technology, applied in optical elements, optics, instruments, etc., can solve the problems of difficult control of imaging quality, reduce the degree of freedom of system correction of off-axis aberrations, etc., to shorten the total optical length, improve imaging quality, and sensitivity The effect of increased sensitivity

Active Publication Date: 2011-09-21
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent No. 6,490,102 discloses a photographic lens with a three-piece lens structure, but its third lens is configured with a glass spherical mirror. The use of a spherical lens reduces the degree of freedom for the system to correct off-axis aberrations, making the imaging quality lower. Difficult to control

Method used

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Examples

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no. 1 example 》

[0104] Please refer to the first embodiment of the present invention figure 1 , for the aberration curve of the first embodiment, please refer to figure 2 . The photographic lens system of the first embodiment is mainly composed of three lenses, which include sequentially from the object side to the image side:

[0105] A first lens 110 with positive refractive power, its object side surface 111 is convex, image side surface 112 is concave, its material is plastic, the object side surface 111 and image side surface 112 of the first lens 110 are both aspherical ;

[0106] A second lens 120 with negative refractive power, the object side surface 121 is concave, the image side surface 122 is convex, and its material is plastic. The object side surface 121 and the image side surface 122 of the second lens 120 are both aspherical ;

[0107]A third lens 130 with negative refractive power, the object-side surface 131 is convex, the image-side surface 132 is concave, and its mate...

no. 2 example 》

[0132] Please refer to the second embodiment of the present invention image 3 , for the aberration curve of the second embodiment, please refer to Figure 4 . The photographic lens system of the second embodiment is mainly composed of three lenses, which include sequentially from the object side to the image side:

[0133] A first lens 310 with positive refractive power has a convex surface 311 on the object side and a concave surface 312 on the image side, and its material is plastic. Both the object side surface 311 and the image side surface 312 of the first lens 310 are aspherical ;

[0134] A second lens 320 with negative refractive power, the object-side surface 321 is concave, the image-side surface 322 is convex, and its material is plastic. The object-side surface 321 and image-side surface 322 of the second lens 320 are both aspherical ;

[0135] A third lens 330 with negative refractive power, its object-side surface 331 and image-side surface 332 are both conc...

no. 3 example 》

[0154] Please refer to the third embodiment of the present invention Figure 5 , for the aberration curve of the third embodiment, please refer to Image 6 . The photographic lens system of the third embodiment is mainly composed of three lenses, which sequentially include from the object side to the image side:

[0155] A first lens 510 with positive refractive power has a convex surface 511 on the object side and a concave surface 512 on the image side, and its material is plastic. Both the object side surface 511 and the image side surface 512 of the first lens 510 are aspherical ;

[0156] A second lens 520 with negative refractive power, the object side surface 521 is concave, the image side surface 522 is convex, and its material is plastic. The object side surface 521 and the image side surface 522 of the second lens 520 are both aspherical ;

[0157] A third lens 530 with negative refractive power, the object-side surface 531 is convex, the image-side surface 532 i...

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Abstract

The invention provides a photographic lens system, which, from an object side to an image side, sequentially comprises a first lens with positive refractive forces, a second lens with negative refractive forces, a third lens and a diaphragm, wherein at least one of an object-side surface and an image-side surface of the third lens is provided with at least an inflection point; the diaphragm is arranged between a photographed object and the first lens; the number of the lenses with refractive forces in the photographic lens system is only three; and the focal distance f of the whole photographic lens system, the focal distance f1 of the first lens, the focal distance f2 of the second lens, the curvature radius R1 of the object-side surface of the first lens, the dispersion coefficient V1 of the first lens, and the dispersion coefficient V2 of the second lens satisfy the following formulas: f / f1 is greater than 1.28 and less than 2.0, (R1 / f)*100 is greater than 23.0 and less than 33.0, (V1-V2) is greater than 30.5 and less than 46.0, and f / f2 is greater than -0.65 and less than -0.25. Through the configuration mode of the lenses above, the optical aberration can be revised effectively, the imaging quality of the system can be improved, meanwhile, the total optical length of the system is shortened, and the characteristic of lens miniaturization is maintained.

Description

technical field [0001] The invention relates to a photographic lens system; in particular, to a miniaturized photographic lens system applied to mobile phones and cameras. Background technique [0002] In recent years, with the rise of mobile phone cameras, the demand for miniaturized photographic lenses has increased day by day, and the photosensitive elements of general photographic lenses are nothing more than photocoupled devices (Charge Coupled Device, CCD) or complementary metal oxide semiconductor elements (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and with the improvement of semiconductor process technology, the pixel size of the photosensitive element is reduced, and the development trend of today's electronic products is good function and thin, light and small appearance. Therefore, it has Miniaturized photographic lenses with good imaging quality have become the mainstream in the current market. [0003] Common miniaturized photographic lenses...

Claims

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Application Information

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IPC IPC(8): G02B13/18G02B13/00
Inventor 汤相岐蔡宗翰
Owner LARGAN PRECISION
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