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Infrared mage pickup lens

An infrared and lens technology, applied in the field of imaging lens, can solve the problems of large aberration and poor imaging effect, and achieve the effect of good aberration and small spherical aberration

Inactive Publication Date: 2010-09-15
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

However, the aberration of this infrared imaging lens in the near-infrared band (750nm-3000mm) is relatively large, making its imaging effect not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0037] The infrared imaging lens 100 of Embodiment 1 satisfies the conditions listed in Table 1 and Table 2, and 2ω=112°, F=0.93mm, F1=-1.572mm, F2=1.637mm, F3=2.085mm, TTL=4.287 mm, FNO.=2.0.

[0038] Table 1

[0039] Surface serial number

[0040] The aspheric coefficients of each aspheric surface are shown in Table 2:

[0041] Table 2

[0042] Surface serial number

[0043] Surface serial number

[0044] In this embodiment, the spherical aberration characteristic curve, field curvature characteristic curve and distortion characteristic curve of the infrared imaging lens 100 are respectively as follows figure 2 , image 3 and Figure 4 shown. figure 2 The curve of is the spherical aberration characteristic curve of the infrared imaging lens 100 under the condition that the wavelength is 940 nm. It can be seen that the spherical aberration of the infrared imaging lens 100 in the near-infrared band is controlled between -0.02 mm and 0.02 m...

Embodiment approach 2

[0046] The infrared imaging lens 100 of Embodiment 2 satisfies the conditions listed in Table 3 and Table 4, and 2ω=121.6°, F=0.775mm, F1=-1.213mm, F2=1.372mm, F3=2.286mm, TTL=4.4 mm, FNO.=2.0.

[0047] table 3

[0048]

[0049]

[0050] The aspheric coefficients of each aspheric surface are shown in Table 4:

[0051] Table 4

[0052] Surface serial number

k

A4

A6

A8

A10

S1

-109.044

0.167728

-0.03708

0.00253

0.004621

S2

0.393899

0.259018

9.640614

-56.4877

188.0098

S4

-51.4818

0.293901

-0.53909

0.441964

0.398552

S5

-0.61408

-0.45532

0.510045

0.124043

-0.09342

S6

-6.42281

-0.01779

0.067174

-0.00447

-0.02032

S7

38.30694

-0.14326

0.187266

-0.05695

-0.01475

[0053] see Figure 5 to Figure 7, the spherical aberration, curvature of field a...

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Abstract

The invention relates to an infrared mage pickup lens which comprises a first lens, a second lens and a third lens in sequence from the object side to the image side. The first lens is provided with a negative focal power; the second lens is provided with a positive focal power, and the third lens is provided with a positive focal power. The infrared mage pickup lens requires that the F / F1 is more than -0.65 and less than -0.55, the F / F2 is more than 0.52 and less than 0.62, and the absolute value of F / F3 is more than 0.3 and less than 0.6, wherein the F1 is the focal distance of the first lens, the F2 is the focal distance of the second lens, the F3 is the focal distance of the third lens, and the F is the integral focal distance of the infrared mage pickup lens. The infrared mage pickup lens ensures that the aberration in the near infrared wave band can be well corrected and causes little aberration such as the spherical aberration, the field curvature and the distortion.

Description

technical field [0001] The invention relates to an imaging lens, in particular to an infrared imaging lens for infrared imaging. Background technique [0002] In recent years, as the market demand for infrared monitoring equipment has increased, the market demand for infrared imaging lenses has also increased accordingly. At present, some infrared imaging lenses are coated with infrared coatings on ordinary lenses, so that they have the function of infrared imaging. However, such an infrared imaging lens has relatively large aberrations in the near-infrared band (750nm-3000mm), which makes its imaging effect not good. Contents of the invention [0003] In view of this, it is necessary to provide an infrared imaging lens with less aberration in the near-infrared band. [0004] An infrared imaging lens, which sequentially includes a first lens with negative refractive power, a second lens with positive refractive power and a third lens with positive refractive power from t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/14G02B9/12H04N5/225
CPCG02B13/008G02B13/0035G02B13/14G02B13/16
Inventor 尹淳义黄俊翔
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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