Lens system

A lens and lens technology, applied in the field of lens systems, can solve problems such as difficult correction of aberrations in lens systems, poor imaging quality, etc.

Inactive Publication Date: 2010-03-31
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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. The correction becomes difficult, making the lens system meet the requirements of miniaturization and poor imaging quality

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0043] Each optical element of the lens system 100 satisfies the conditions in Table 1 and Table 2, and 2ω=74°.

[0044] Table 1

[0045]

[0046]

[0047] Table 2

[0048] the surface

[0049] Field curvature, distortion and spherical aberration of the lens system 100 are as follows Figure 2 to Figure 4 shown. figure 2 The meridian field curvature and sagittal field curvature values ​​are all controlled within the range of (-0.10mm, 0.10mm). image 3 The distortion rate is controlled in the range of (-2%, 2%). Figure 4 Among them, the spherical aberration values ​​observed for f-line (value 435.8nm), d-line (value 587.6nm), and c-line (value 656.3nm) respectively. Generally speaking, the spherical aberration generated by the lens system 100 of this embodiment for visible light is within the range of (-0.05 mm, 0.05 mm). It can be seen that the aberration, field curvature and distortion of the lens system 100 can be well corrected.

no. 2 approach

[0051] Each optical element of the lens system 100 satisfies the conditions of Table 3 and Table 4, and 2ω=72°.

[0052] table 3

[0053] lens system 100

Radius of curvature (mm)

Thickness (mm)

Refractive index

Abbe number

The surface of the first lens 10 on the object side

1.406081

0.642755

1.543

56.803

The image-side surface of the first lens 10

3.657686

0.228189

-

-

The surface of the second lens 20 on the object side

1.25147

0.507969

1.632

23.415

The surface of the second lens 20 on the image side

2.54427

0.08

-

-

The surface of the third lens 30 on the object side

7.841619

0.822438

1.543

56.803

The surface of the third lens 30 on the image side

4.62433

0.206411

-

-

The fourth lens 40 is on the object side surface

1.810916

0.599514

1.632

...

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Abstract

The invention relates to a lens system, which sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with the positive focal power, a fourth lens and an imaging surface in a direction from an object side to an image side along an optical axis of the lens system. The lens system meets the following condition formulae: (1) TTL / f is less than 1.3; and (2) f1 / f is more than 0.75 and is less than 1.25, wherein TTL is the total length of the lens system; f1 is the focal length of the first lens; and f is the focal length of the lens system. Under the condition of meeting the condition formulae, the lens system is provided with a smaller height so as to meet the miniaturization requirement of the lens system, and simultaneously, ensurethe proportion of the focal power of the first lens in the lens system. Thus, the lens system can reduce spherical aberration and improve imaging quality.

Description

technical field [0001] The invention relates to a lens system. Background technique [0002] In recent years, with the development of multimedia, there is an increasing demand for digital products to use solid-state imaging devices such as CCD (Charged Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) as imaging elements. 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. The correction becomes difficult so that the lens system meets the requirements of miniaturization and poor imaging quality. Contents of the invention [0004] In view of this, it is necessary to provide a lens system that satisfies miniaturization and has better imaging quality. [0005] A lens system, which sequentially includes a first len...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B9/34G02B13/18
CPCG02B9/34G02B13/18G02B13/004
Inventor 王光儒黄俊翔
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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