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Thinned imaging lens

An imaging lens and imaging surface technology, applied in the field of imaging lenses, can solve the problems of increased cost, complicated production and manufacture, and difficulty in miniaturizing the lens, and achieve the effect of shortening the length of the lens, improving the imaging quality, and widening the field of view.

Active Publication Date: 2012-10-03
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too many lens configurations will make it difficult to miniaturize the lens, and it will become relatively complicated for production and manufacturing, resulting in an increase in cost, which is not economically beneficial. Therefore, the market desperately needs a simple, low-cost and wide-ranging lens. Thin imaging lens with wide field of view

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0087] Please refer to the first embodiment of the present invention Figure 1A , for the aberration curve of the first embodiment, please refer to Figure 1B . The thinned imaging lens of the first embodiment is mainly composed of two lenses, which sequentially include from the object side to the image side:

[0088] A first lens 110 with negative refractive power, its object side surface 111 is convex and 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 ;

[0089] A second lens 120 with positive refractive power, its object-side surface 121 and image-side surface 122 are both convex, and its material is plastic, and the object-side surface 121 and image-side surface 122 of the second lens 120 are both aspherical; and

[0090] An aperture 100 is disposed between the second lens 120 and an imaging surface 140;

[0091] In addition, an infrared filter filter (IR Filte...

no. 2 example

[0115] Please refer to the second embodiment of the present invention Figure 2A , for the aberration curve of the second embodiment, please refer to Figure 2B . The thinned imaging lens of the second embodiment is mainly composed of two lenses, which sequentially include from the object side to the image side:

[0116] A first lens 210 with negative refractive power, its object side surface 211 is convex and image side surface 212 is concave, its material is plastic, the object side surface 211 and image side surface 212 of the first lens 210 are both aspherical ;

[0117] A second lens 220 with positive refractive power, its object-side surface 221 is concave and image-side surface 222 is convex, its material is plastic, the object-side surface 221 and image-side surface 222 of the second lens 220 are both aspherical ;and

[0118] An aperture 200 is disposed between the second lens 220 and an imaging surface 240;

[0119] An infrared filter 230 is also included between...

no. 3 example

[0138] Please refer to the third embodiment of the present invention Figure 3A , for the aberration curve of the third embodiment, please refer to Figure 3B . The thinned imaging lens of the third embodiment is mainly composed of two lenses, which sequentially include from the object side to the image side:

[0139] A first lens 310 with negative refractive power, its object side surface 311 is convex and image side surface 312 is concave, its material is plastic, the object side surface 311 and image side surface 312 of the first lens 310 are both aspherical ;

[0140] A second lens 320 with positive refractive power, its object-side surface 321 and image-side surface 322 are both convex, and its material is plastic, and the object-side surface 321 and image-side surface 322 of the second lens 320 are both aspherical; and

[0141] An aperture 300 is disposed between the second lens 320 and an imaging surface 340;

[0142] An infrared filter 330 is also included between...

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Abstract

The invention discloses a thinned imaging lens which sequentially comprises a first lens with negative folding force, a second lens with positive folding force and a diaphragm from an object side to an image side, wherein the object side surface of the first lens is a convex surface and the image side surface of the first lens is a concave surface; at least one surface of the object side surface and image side surface of the second lens is an aspheric surface; the diaphragm is arranged between the second lens and the imaging surface; the number of the lenses with the folding force in the thinned imaging lens is two; the focal length of the whole thinned imaging lens is f; the focal length of the second lens is f2; the curvature radius of the object side surface of the second lens is R3; the curvature radius of the image side surface of the second lens is R4; and the parameters meet the following relational expressions that the f / f2 is larger than 0.40 and less than 1.20 and the absolute value of R3 / R4 is larger than 1.5. The thinned imaging lens disclosed by the invention can be used for effectively prompting the imaging quality of a system through the configuration form of the lens group, can maintain the sufficient back focal length on the premise of shortening the length of the lenses and can simultaneously obtain a wide field angle.

Description

technical field [0001] The invention relates to an imaging lens, in particular to a thinned imaging lens with a wide viewing angle. Background technique [0002] In recent years, with the rise of portable electronic products with photographic functions, the demand for thinner photographic lenses has increased day by day, and the photosensitive element of general photographic lenses is nothing more than a charge coupled device (CCD) or complementary There are two types of metal oxide semiconductor elements (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and with the improvement of semiconductor manufacturing process technology, the pixel size of the photosensitive element has been reduced, and today's electronic products have good functions, wide viewing angles and The thin, light and small appearance is the development trend. Therefore, the thin wide-angle photography lens with good image quality has become the mainstream in the current market. [0003] Most ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/18
Inventor 林铭清汤相岐蔡宗翰
Owner LARGAN PRECISION