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Low height lens system

A low-height, lens technology used in the field of camera lenses

Inactive Publication Date: 2009-12-23
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And this increased demand itself requires further miniaturization of the lens system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Each optical element of the lens system 100 satisfies the conditions of Table 1 and Table 2, and its f=3.52mm; FNo=3.2; 2ω=68°.

[0041] Table 1

[0042] lens system 100

[0043] Table 2

[0044] the surface

[0045] In the lens system 100 of the first embodiment, the spherical aberration, field curvature and distortion are respectively as follows Figure 2 to Figure 4 shown. figure 2 Among them, the spherical aberration values ​​observed for f-line (λ value 435.8nm), d-line (λ value 587.6nm), and c-line (λ value 656.3nm) respectively. Generally speaking, the spherical aberration generated by the lens system 100 of Embodiment 1 for visible light is within the range of (-0.04mm, 0.04mm). image 3 The meridian field curvature and sagittal field curvature values ​​are all controlled within the range of (-0.05mm, 0.05mm). Figure 4 The distortion rate is controlled in the range of (-2%, 2%). It can be seen that the aberration, field curvature and d...

Embodiment 2

[0047] Each optical element of the lens system 100 satisfies the conditions of Table 3 and Table 4, and its f=3.43mm; FNo=3.2; 2ω=68.4°.

[0048] table 3

[0049] lens system 100

Radius of curvature (mm)

Thickness (mm)

Refractive index

Abbe number

diameter (mm)

subject

gigantic

1000

-

-

-

The surface of the first lens 10 on the object side

1.033

0.65

1.543

56.04

-

The image-side surface of the first lens 10

2.89

0.42

1.543

56.04

-

The surface of the second lens 20 on the object side

-1.04

0.46

1.585

29.9

-

The surface of the second lens 20 on the image side

-1.355

0.51

1.585

29.9

-

The surface of the third lens 30 on the object side

3.75

0.72

1.543

56.04

-

The surface of the third lens 30 on the image side

2.27

0.1...

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Abstract

The invention relates to a low-height lens system, which comprises a first lens with positive diopter, a second lens with negative diopter and a third lens with negative diopter sequentially from the object side to the image side. The lens system satisfies conditional formulas (1) D / TTL>1.2; (2) 4.5>R1R / R1F>2.2 and (3) f / R1F>3. Among them, D: the maximum imaging circle diameter of the lens system on the imaging surface; TTL: the distance from the surface of the first lens near the object side to the imaging surface; R1R: the radius of curvature of the surface of the first lens near the image side; R1F: the first lens The radius of curvature of the surface near the object side; f: the effective focal length of the lens system.

Description

technical field [0001] The invention relates to a camera lens, in particular to a low-height lens system suitable for mobile phones, PC cameras and the like. Background technique [0002] In recent years, with the development of multimedia, there is an increasing demand for imaging elements of solid-state imaging devices such as CCD (Charged Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) used in laptop computers, videophones, and mobile phones. And this increased demand itself requires further miniaturization of the lens system. [0003] On the other hand, due to the improvement of the process technology of these solid-state imaging devices such as CCD or CMOS, imaging devices with each pixel only a few microns in size have been produced, which makes the system miniaturized and improves the resolution requirements of the camera lens. Therefore, providing a lens system with low height, excellent optical performance and good imaging quality is the developme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B9/12G02B13/18G02B1/04
CPCG02B9/12G02B13/0035
Inventor 郑婷予张文祥黄俊翔
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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