KR101730030B1 - Infrared Lens Module - Google Patents
Infrared Lens Module Download PDFInfo
- Publication number
- KR101730030B1 KR101730030B1 KR1020150089949A KR20150089949A KR101730030B1 KR 101730030 B1 KR101730030 B1 KR 101730030B1 KR 1020150089949 A KR1020150089949 A KR 1020150089949A KR 20150089949 A KR20150089949 A KR 20150089949A KR 101730030 B1 KR101730030 B1 KR 101730030B1
- Authority
- KR
- South Korea
- Prior art keywords
- lens
- refractive power
- concave surface
- positive
- infrared
- Prior art date
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- 150000004770 chalcogenides Chemical class 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 12
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 10
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract 3
- 229910052714 tellurium Inorganic materials 0.000 claims description 5
- RBFDCQDDCJFGIK-UHFFFAOYSA-N arsenic germanium Chemical compound [Ge].[As] RBFDCQDDCJFGIK-UHFFFAOYSA-N 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 8
- 238000001931 thermography Methods 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- VGRFVJMYCCLWPQ-UHFFFAOYSA-N germanium Chemical compound [Ge].[Ge] VGRFVJMYCCLWPQ-UHFFFAOYSA-N 0.000 description 8
- 239000011669 selenium Substances 0.000 description 4
- 229910052711 selenium Inorganic materials 0.000 description 3
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 description 2
- 239000005083 Zinc sulfide Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 229910052798 chalcogen Inorganic materials 0.000 description 1
- 150000001787 chalcogens Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
- G02B13/143—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation for use with ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The present invention relates to an infrared lens module in which an infrared optical system of a thermal imaging apparatus stably maintains a focal distance in a wide temperature range through a combination of germanium and a chalcogenide lens. The infrared lens module includes a first lens, a second lens, And a diaphragm disposed between the second lens and the third lens, wherein the first lens has a convex surface (R1) having a positive refractive power on the object side and a negative refractive power And the second lens has a convex surface R3 having a positive refractive power on the object side in a state in which the second lens is disposed behind the first lens, And a concave surface R4 having a negative refractive power is formed on the image side and is formed with a positive magnification as a whole, and the third lens has a negative refractive power on the object side in a state of being disposed behind the second lens Having A concave surface R6 having a positive refractive power is formed on the upper side and a positive power is formed on the entire surface of the concave surface R6, and the fourth lens is arranged on the rear side of the third lens, And a concave surface R8 having a positive refractive power is formed on the upper side of the concave surface R5 of the third lens. A concave surface R5 of the third lens is formed with a DOE surface, The first lens is made of a germanium material, and the second lens, the third lens and the fourth lens are made of chalcogenide material.
Description
The present invention relates to an infrared lens module to which a DOE is applied. More specifically, the present invention relates to an infrared lens module in which a focal distance is stably maintained through a combination of a germanium, a chalcogenide lens, and a chalcogenide lens using DOE To an infrared lens module to which the present invention is applied.
Generally, a thermal imaging device is a device that detects infrared rays emitted by a person or an object and displays the image as an image, whereby the position and the dynamics of a person or an object can be grasped at night or in a place without light.
However, the infrared ray is a general glass lens and the infrared ray-exclusive lens made of a material such as germanium (Ge), zinc sulfide (ZnS), zinc selenide (ZnSe), chalcogenide, etc. is adopted because the transmittance is low due to low transmittance. These infrared lenses are characterized by a large change in refractive index depending on the temperature and a relatively small dispersion capability of the material compared with the materials used in the visible light region, and the DOE lens reduces the chromatic aberration of the optical system and reduces the size.
In other words, the optical performance of the thermal imager can be reduced by reducing the chromatic aberration and the size of the optical system by using the DOE lens.
An object of the present invention is to provide a lens system capable of obtaining a stable thermal image with minimized chromatic aberration by applying a combination of lenses having different materials and surface shapes, and a DOE lens, and an infrared lens Module.
According to an aspect of the present invention, there is provided an infrared lens module including a first lens, a second lens, a lens system including a third lens and a fourth lens, and a diaphragm disposed between the second lens and the third lens, Wherein the first lens has a convex surface (R1) having a positive refractive power on the object side and a concave surface (R2) having a negative refractive power on the upper side, the first lens is formed with a negative magnification as a whole, A convex surface R3 having a positive refractive power is formed on the object side in a state where the lens is disposed behind the first lens and a concave surface R4 having a negative refractive power is formed on the upper side, A concave surface R5 having a negative refractive power is formed on the object side in a state where the third lens is disposed behind the second lens and a concave surface R6 having positive refractive power is formed on the image side, And is formed with a positive magnification as a whole, The fourth lens has a convex surface R7 having a positive refracting power on the object side and a concave surface R8 having a positive refracting power on the upper side in a state of being disposed behind the third lens, The first lens is made of a germanium material, and the second lens, the third lens and the fourth lens are made of chalcogenide material.
The infrared lens module of the present invention may further include a germanium (Ge) -selenium (Se) -thelrium (Te) chalcogenide lens, a germanium-arsenic (As) -Selenium-based chalcogenide lens or a germanium-arsenic-selenium-tellurium-based chalcogenide lens is selectively adopted.
The infrared lens module of the present invention is characterized in that the first lens has an object-side convex surface R1 made of a spherical surface, and an upper concave surface R2 of the first lens except for the convex surface R1, Both sides R3 to R8 are all made of aspheric surfaces and R5 is a DOE plane.
Further, the infrared lens module of the present invention is characterized by satisfying the following condition (1).
[Condition 1]
Zo1 > 0 [the spherical surface (R1) of the first lens]
Za2 > 0 [Aspherical surface (R2) of the first lens]
Za3 > 0 [Aspheric surface (R3) of the second lens]
Za5 < 0 [Aspheric surface (R5) of the third lens]
Za6 < 0 [Aspheric surface (R6) of the third lens]
Za8 < 0 [Aspherical surface (R8) of the fourth lens]
In addition, the infrared lens module of the present invention is characterized in that the F number is in the range of 1.0 to 1.5.
According to the infrared lens module of the present invention, it is possible to obtain a stable thermal image image in which the chromatic aberration is minimized between the first lens made of germanium material, the second lens made of chalcogenide material, the third lens and the fourth lens.
In addition, since the thermal imaging apparatus having a horizontal angle of view of 90 degrees can be provided, the usability of the present invention can be increased.
1 is a schematic diagram showing a lens arrangement state of an infrared lens module according to the present invention;
2 is a diagram illustrating ray aberration for an embodiment of an infrared lens module according to the present invention.
3 shows a spot diagram for an embodiment of an infrared lens module according to the present invention;
4 is a view showing a distortion aberration for an embodiment of the infrared lens module according to the present invention.
5 is an MTF curve for an embodiment of an infrared lens module according to the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is a schematic diagram showing a lens arrangement state of a wide field infrared LED module according to the present invention. 1, the infrared lens module of the present invention includes a lens system including a
The
Further, the
A convex surface R3 having a positive refractive power is formed on the object side in a state where the
The
A convex surface R7 having a positive refractive power is formed on the object side in a state in which the
The
Specifically, the
The
Hereinafter, the design of the lens module according to the present invention will be described in detail.
The object side convex surface R1 of the
If the F number (effective focal length / incident optical power) is less than 1.0, it is difficult to correct the aberration because the diameter of each
On the other hand, the spherical surface R1 of the first lens has a sag Zo value calculated by the following Equation 1 and the other lens aspheric surfaces R2 to R8 have a sag Za value calculated by Equation (2) 1 is satisfied.
[Condition 1]
Zo1 > 0 [the spherical surface (R1) of the first lens]
Za2 > 0 [Aspherical surface (R2) of the first lens]
Za3 > 0 [Aspheric surface (R3) of the second lens]
Za5 < 0 [Aspheric surface (R5) of the third lens]
Za6 < 0 [Aspheric surface (R6) of the third lens]
Za8 < 0 [Aspherical surface (R8) of the fourth lens]
[Equation 1]
&Quot; (2) "
Where C is the curvature (C = 1 / R, R is the radius of curvature of the lens), Y is the lens height, and A, B, C 'and D are the aspheric coefficients.
Table 1 below shows basic data of the lens module satisfying the above-mentioned condition 1, in which the optical field length (OAL) is 53 mm, the aperture ratio (FNO) is F / 1.3, the focal distance f is 5.44 mm, the refractive index Nd of the germanium lens manufactured by Success Infrared of China and the refractive index Nd of the
Table 2 shows the aspheric surface coefficient values of the lens modules in Table 1, and Table 3 shows the DOE count values of the fifth surface of the lens module in Table 1. < tb > < TABLE >
FIGS. 2 to 6 are analysis graphs showing optical characteristics of the lens module made up of the values shown in Tables 1 and 2.
Specifically, FIG. 2 shows the ray aberration calculated with the object distance as infinite, which is shown on the optical axis of 40.00 deg. And 54.09 deg. With the curvature of the meridional surface and the curvature of the image surface. Fig. . The spot diagram shows that the spot diagram is obtained by dividing incident copper into hundreds or thousands of meshes in order to track the rays and tracking the rays with each mesh from one point on the object, (Sopt) on the upper surface. The three circles in the center of Fig. 3 each represent a spot diagram for the field.
Fig. 4 shows the distortion aberration calculated with the object distance as infinite. Fig. 5 shows the degree of curvature of the screen. Fig. 5 shows the MTF (Modulation Transfer Functions) curve of the resolution calculated with the object distance as infinite MTF is 0.411 when the detector pixel size is 17 mu m and the limit frequency is 29 mm / cycles, and the performance is usually good when the limiter frequency is 0.4 or more.
As shown in Figs. 2 to 5, the lens module of the present invention has image values near to the central axis in almost all fields, so that the correction state of the spherical aberration, the meridional image surface aberration and the chromatic aberration is good, .
FIG. 6 is a diagram of a modification of a double gauss lens shape, which is a lens shape obtained by calculating an object distance to be infinite and which is advantageous to minimize a wide angle, an astigmatism, a surface curvature, and a distortion aberration.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
10: first lens
20: Second lens
30: Third lens
40: fourth lens
50: aperture
Claims (5)
The first lens has a convex surface R1 having a positive refractive power on the object side and a concave surface R2 having a negative refractive power on the upper side and is formed with a negative magnification as a whole,
A convex surface R3 having a positive refractive power is formed on the object side in a state where the second lens is disposed behind the first lens and a concave surface R4 having a negative refractive power is formed on the upper side, Is formed at a positive magnification,
The third lens has a concave surface R5 having a negative refractive power on the object side in a state of being disposed behind the second lens and a concave surface R6 having a positive refractive power on the upper side, Is formed at a positive magnification,
The concave surface R5 of the third lens is a DOE surface,
A convex surface R7 having a positive refractive power is formed on the object side in a state where the fourth lens is disposed behind the third lens and a concave surface R8 having a positive refractive power is formed on the upper side, Is formed at a positive magnification,
Wherein the first lens is made of a germanium material, the second lens, the third lens and the fourth lens are made of chalcogenide material,
The first lens has an object-side convex surface R1 made of a spherical surface. Both the upper concave surface R2 of the first lens except for the convex surface R1 and both surfaces R3-R8 of the remaining lens are aspherical surfaces Lt; / RTI >
The following condition (1) is satisfied.
[Condition 1]
Zo1 > 0 [the spherical surface (R1) of the first lens]
Za2 > 0 [Aspherical surface (R2) of the first lens]
Za3 > 0 [Aspheric surface (R3) of the second lens]
Za5 < 0 [Aspheric surface (R5) of the third lens]
Za6 < 0 [Aspheric surface (R6) of the third lens]
Za8 < 0 [Aspherical surface (R8) of the fourth lens]
Here, Zo is the sag value of the spherical surface, Za is the sag value of the aspherical surface
The second lens, the third lens and the fourth lens may be germanium-Ge-selenium-tellurium (Te) chalcogenide lenses, germanium-arsenic (As) - an arsenic-selenium-tellurium-based chalcogenide lens is selectively employed.
And the F-number is in the range of 1.0 to 1.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150089949A KR101730030B1 (en) | 2015-06-24 | 2015-06-24 | Infrared Lens Module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150089949A KR101730030B1 (en) | 2015-06-24 | 2015-06-24 | Infrared Lens Module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20170000899A KR20170000899A (en) | 2017-01-04 |
| KR101730030B1 true KR101730030B1 (en) | 2017-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150089949A KR101730030B1 (en) | 2015-06-24 | 2015-06-24 | Infrared Lens Module |
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| Country | Link |
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| KR (1) | KR101730030B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101846021B1 (en) * | 2017-12-07 | 2018-04-05 | 엘아이지넥스원 주식회사 | Infrared Optical System Using Hybrid Lens |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006047343A (en) | 2004-07-30 | 2006-02-16 | Sumitomo Electric Ind Ltd | Infrared lens |
| KR101214601B1 (en) * | 2012-07-23 | 2012-12-21 | (주)토핀스 | Athermalized infrared lens module |
| JP2015049453A (en) * | 2013-09-03 | 2015-03-16 | 株式会社ニコン | Imaging lens and on-vehicle camera |
-
2015
- 2015-06-24 KR KR1020150089949A patent/KR101730030B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006047343A (en) | 2004-07-30 | 2006-02-16 | Sumitomo Electric Ind Ltd | Infrared lens |
| KR101214601B1 (en) * | 2012-07-23 | 2012-12-21 | (주)토핀스 | Athermalized infrared lens module |
| JP2015049453A (en) * | 2013-09-03 | 2015-03-16 | 株式会社ニコン | Imaging lens and on-vehicle camera |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101846021B1 (en) * | 2017-12-07 | 2018-04-05 | 엘아이지넥스원 주식회사 | Infrared Optical System Using Hybrid Lens |
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| Publication number | Publication date |
|---|---|
| KR20170000899A (en) | 2017-01-04 |
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