CN114690379B - Small-sized infrared optical lens - Google Patents
Small-sized infrared optical lens Download PDFInfo
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- CN114690379B CN114690379B CN202210278599.XA CN202210278599A CN114690379B CN 114690379 B CN114690379 B CN 114690379B CN 202210278599 A CN202210278599 A CN 202210278599A CN 114690379 B CN114690379 B CN 114690379B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 109
- 238000003384 imaging method Methods 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000005499 meniscus Effects 0.000 claims abstract description 6
- 239000005387 chalcogenide glass Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 238000001931 thermography Methods 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000004297 night vision Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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- 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
-
- 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
- G02B13/0035—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 three lenses
-
- 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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- 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
Abstract
The invention discloses a small-sized infrared optical lens, which comprises a first lens, a second lens and a third lens, wherein the first lens, the second lens and the third lens are sequentially arranged along the transmission direction of an incident light beam; the first lens is a meniscus positive lens with positive refractive power along the transmission direction of the incident light beam; the second lens is a meniscus positive lens with positive refractive power; the third lens is a meniscus positive lens with positive refractive power; the small infrared optical lens satisfies the following relation: 56.91/mm < TTL/ImgH/f < 57.97/mm and FNO=1.00; wherein, TTL is the distance between the first object side surface and the image surface of the optical lens on the optical axis, namely the total length of the optical lens, imgH is the radius of the effective imaging circle of the optical lens, f is the effective focal length of the optical lens, and FNO is the f-number of the optical lens. The small infrared optical lens has smaller total length, larger effective imaging circle radius and effective focal length, and has higher imaging effect of pixels while meeting the miniaturization design.
Description
Technical Field
The invention relates to a small-sized infrared optical lens, and belongs to the technical field of infrared optical imaging.
Background
The IR lens (long-wave infrared lens) has a very wide application range, and can be used for special purposes corresponding to infrared rays or common lenses. In other words, according to different use occasions, the infrared corresponding lens can be flexibly matched with a conventional color camera, a black-and-white camera and a day-and-night conversion camera. The black-and-white camera has no infrared cut filter, but contains infrared light in the spectrum of sunlight, so that the imaging of the black-and-white camera is interfered by the infrared light even under the sunlight condition. Therefore, the imaging quality can be effectively improved by matching with the infrared corresponding lens.
In the prior art, the imaging quality of the infrared optical lens is generally improved by increasing the number of lenses, but increasing the number of lenses often leads to larger size of the optical lens along the optical axis direction, and because of factors such as rear intercept and mechanical structural design of the lens, the assembly and adjustment are complicated and difficult to change, and the miniaturization design of the optical lens is difficult to realize. How to realize the miniaturized design of the infrared optical lens and ensure the optical lens to have better imaging quality is a problem to be solved at present.
Disclosure of Invention
The invention provides a small infrared optical lens, which can be matched with a miniature infrared thermal imaging module of a 640 x 512 12um detector, reduces the space volume, reduces the weight of the lens, improves the imaging quality and simultaneously is a core module for talking, and can be applied to more light portable fields.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a small-sized infrared optical lens comprises a first lens, a second lens and a third lens which are sequentially arranged along the transmission direction of an incident light beam; along the transmission direction of the incident light beam, two surfaces of the first lens are a first object side surface and a first image side surface in sequence, two surfaces of the second lens are a second object side surface and a second side surface in sequence, and two surfaces of the third lens are a third object side surface and a third image side surface in sequence; the first lens element with positive refractive power has a convex first object-side surface and a concave first image-side surface; the second lens is a meniscus type positive lens with positive refractive power, the second object side surface is a convex surface, and the second image side surface is a concave surface; the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface; the small infrared optical lens satisfies the following relation: 56.91/mm < TTL/ImgH/f < 57.97/mm, 1.00 < FNO < 1.01; wherein, TTL is the distance between the first object side surface and the image surface of the optical lens on the optical axis, namely the total length of the optical lens, imgH is the radius of the effective imaging circle of the optical lens, f is the effective focal length of the optical lens, and FNO is the f-number of the optical lens.
The first lens has positive refractive power, is favorable for shortening the total length of the optical lens and compressing the light trend, so that the spherical aberration is reduced, and the miniaturized design of the optical lens is realized and the imaging quality is higher. The first object side surface is the convex surface, so that the positive refractive power of the first lens is enhanced, the light rays are convenient to converge, and a reasonable light ray incidence angle is further provided for the introduction of the marginal light rays, so that the optical lens has a reasonable field angle. The second lens element with positive refractive power has a concave image-side surface, so that light converging through the first lens element can be gradually diffused, and the light deflection angle is reduced. By arranging the third object side surface to be a concave surface, the compactness between lenses is improved, and the stray light risk of the third image side surface is reduced. By arranging the third image side surface to be convex, the surface shape of the third object side surface is restrained, the phenomenon that the thickness of the third lens element at the optical axis o is larger than the edge thickness difference of the third lens element due to excessive bending of the third image side surface is avoided, and the processing precision of the third image side surface S11 is reduced. The incidence angle of light on the image surface of the optical lens can be kept in a reasonable range, and when the optical lens is applied to the thermal infrared imager module, the optical lens is easier to match with the infrared detector of the thermal infrared imager module.
The small infrared optical lens meets the following conditions: 56.91/mm < TTL/ImgH/f < 57.97/mm and 1.00 < FNO < 1.01, so that the optical lens has smaller total length, larger effective imaging circle radius and effective focal length, and when the optical lens is applied to a micro thermal infrared imager module, the larger effective imaging circle radius can be matched with an infrared thermal imaging chip with larger infrared target area, thereby ensuring that the optical lens has imaging effect of higher pixels while meeting the miniaturization design. When TTL/ImgH/f is more than or equal to 57.97/mm, the total length of the optical lens is larger, the design requirement of miniaturization of the optical lens cannot be met, the effective imaging circle radius and the effective focal length of the optical lens are smaller, and large-field-angle design is difficult to realize. When TTL/ImgH/f is less than or equal to 56.91/mm, the total length of the optical lens is smaller, the effective imaging radius and the effective focal length are larger, the processing difficulty is larger, the lens is easy to generate the situation of surface distortion during processing, and the production yield of the optical lens is reduced.
As one of the implementation schemes, the optical lens satisfies the following relation: 0.85 < |f12/f| < 14; wherein f12 is a combined focal length of the first lens and the second lens. Thus, the ratio of the combined focal length of the first lens and the second lens to the effective focal length of the optical lens can be controlled, and the introduction of aberration is reduced.
Preferably, the first image side surface is a diffraction surface, and the second image side surface and the third object side surface are aspherical surfaces. Therefore, the first lens and the second lens are favorable for converging light rays rapidly, paraxial light rays are refracted at a low deflection angle, introduction of spherical aberration is reduced, converging marginal light rays are favorable for entering the optical lens, and the optical lens has a reasonable field angle.
As one of the implementation schemes, the optical lens satisfies the following relation: R31/R32 is more than 1.72 and less than 2.11; wherein R31 is a radius of curvature of the third object-side surface at the optical axis, and R32 is a radius of curvature of the third image-side surface at the optical axis. In this way, the radii of curvature of the object side and the image side of the third lens can be constrained, so that the focal length of the third lens can be better controlled. Meanwhile, the curvature radius of the object side surface and the image side surface of the third lens is controlled within a reasonable range, so that a better deflection effect on light rays can be achieved, particularly when the third lens is an aspheric lens, the deflection effect on the light rays is easier to improve, good resolution can be obtained, in addition, the light and thin design of the third lens is facilitated, meanwhile, the processing sensitivity of the third lens can be reduced, and the processing difficulty of the third lens is reduced.
Furthermore, the lens satisfies CT3/BF more than 0.4 and less than 0.79; wherein CT3 is the thickness of the third lens element on the optical axis, BF is the minimum distance between the image side surface of the third lens element and the image surface of the optical lens element on the optical axis. The method satisfies the relation, can reasonably control the distance from the third lens to the image surface, is favorable for reducing the molding difficulty and the processing surface type error of the third lens and controlling distortion, thereby improving the imaging quality of the optical lens.
It is considered that the infrared optical lens can be applied to electronic devices such as vehicle-mounted devices, handheld electrical detection devices, portable infrared night vision devices and the like or applied to automobiles and personal outdoor products. The first lens L1, the second lens L2 and the third lens L3 may be all made of chalcogenide glass. Therefore, the optical lens has good optical effect, and the influence of temperature on the lens can be reduced. The lens processing cost and the weight of the lens can be reduced while the influence of the reduced temperature on the lens is ensured to realize a better imaging effect, so that the processing cost of the optical lens and the overall weight of the optical lens are reduced.
To further ensure imaging quality, the radius of curvature of the first object side is 13.105 ±0.002mm, and the radius of curvature of the first image side is 12.033 ±0.002mm; the curvature radius of the second object side surface is 20.323 plus or minus 0.002mm, and the curvature radius of the second image side surface is 19.625 plus or minus 0.002mm; the radius of curvature of the third object side surface is-43.282 + -0.002 mm, and the radius of curvature of the third image side surface is-20.575 + -0.002 mm. The center thickness of the first lens is 4.00 plus or minus 0.02mm, the center thickness of the second lens is 3.80 plus or minus 0.02mm, and the center thickness of the third lens is 4.00 plus or minus 0.02mm; the center interval between the first lens and the second lens is 2.80 + -0.02 mm, and the center interval between the second lens and the third lens is 2.20 + -0.02 mm.
The effective focal length f=19 mm, the aperture size fno=1.00, the field angle fov=22.6° 18.2 °, the total optical length ttl=17.2 mm, the working wavelength: 8-14um, suitable for 640 x 512 12um detectors.
The technology not mentioned in the present invention refers to the prior art.
The invention discloses a small infrared optical lens, which is characterized in that through selecting each lens, the optical lens meets the requirements of 56.91 < TTL/ImgH/f < 57.97 and 1.00 < FNO < 1.01, the total length (the distance from the first object side surface to the image surface of the optical lens on the optical axis) of the optical lens and the ratio between the effective imaging radius and the focal length can be reasonably limited, and the optical lens has smaller total length, larger effective imaging radius and effective focal length.
Drawings
FIG. 1 is a schematic diagram of a compact infrared optical lens according to the present invention;
FIG. 2 is an MTF diagram of an infrared optical lens in example 5;
FIG. 3 is a lattice diagram of an infrared optical lens in example 5;
FIG. 4 is a distortion chart of an infrared optical lens in example 5;
FIG. 5 is an illumination diagram of an infrared optical lens in example 5;
in the figure, 1 is a first lens, 2 is a second lens, 3 is a third lens, 4 is a detector window, and 5 is an image plane.
Detailed Description
For a better understanding of the present invention, the following examples are further illustrated, but are not limited to the following examples.
Example 1
As shown in fig. 1, a compact infrared optical lens includes a first lens, a second lens, and a third lens disposed in order along a transmission direction of an incident light beam; along the transmission direction of the incident light beam, two surfaces of the first lens are a first object side surface and a first image side surface in sequence, two surfaces of the second lens are a second object side surface and a second side surface in sequence, and two surfaces of the third lens are a third object side surface and a third image side surface in sequence; the first lens element with positive refractive power has a convex first object-side surface and a concave first image-side surface; the second lens is a meniscus type positive lens with positive refractive power, the second object side surface is a convex surface, and the second image side surface is a concave surface; the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface; the small infrared optical lens satisfies the following relation: 56.91/mm < TTL/ImgH/f < 57.97/mm, 1.00 < FNO < 1.01; wherein TTL is the distance between the first object side surface and the image plane of the optical lens on the optical axis, that is, the interval between the first object side surface and the center of the image plane, imgH is the radius of the effective imaging circle of the optical lens, f is the effective focal length of the optical lens, and FNO is the f-number of the optical lens.
Example 2
On the basis of example 1, the following modifications were further made: the small infrared optical lens also satisfies the following relation: 0.85 < |f12/f| < 14; wherein f12 is a combined focal length of the first lens and the second lens.
Example 3
On the basis of example 2, the following modifications were further made: the first lens image surface is a diffraction surface, and diffraction phase angles are respectively:
wherein ρ1 and ρ2 are normalized radii, M1 and M2 are diffraction orders, β1 and β2 are diffraction coefficients, δ 0 Compensating for phase shift;
c2 =Φ1, c4=Φ2 is the diffraction phase angle;
the second image side and the third object side are aspheric:
the meaning of each quantity in the equation is as follows:
z is the lens height of the aspheric surface along the optical axis direction;
k is the conic coefficient;
c=1/R, R being the radius of curvature of the lens;
x is the radius (the distance from the mirror center to the periphery);
a4 a6 a8 a10 a12 are aspherical coefficients.
Table 2 shows the aspherical coefficients of the second image side
Table 3 shows the aspherical coefficients of the third object side
Example 4
On the basis of example 3, the following modifications were further made: the small infrared optical lens satisfies the following relation: R31/R32 is more than 1.72 and less than 2.11; wherein R31 is a radius of curvature of the third object-side surface at the optical axis, and R32 is a radius of curvature of the third image-side surface at the optical axis. At the same time also satisfies the following conditions: CT3/BF is more than 0.4 and less than 0.79; the CT3 is the thickness of the third lens element on the optical axis, i.e., the center thickness of the third lens element, and BF is the minimum distance between the image side surface of the third lens element and the image plane of the optical lens element on the optical axis, i.e., the minimum center interval between the third image side surface and the image plane. The first lens L1, the second lens L2 and the third lens L3 are all made of chalcogenide glass.
Example 5
On the basis of example 4, the following modifications were further made: the curvature radius of the first object side surface is 13.105mm, and the curvature radius of the first image side surface is 12.033mm; the radius of curvature of the second object side is 20.323mm, and the radius of curvature of the second image side is 19.625mm; the radius of curvature of the third object-side surface is-43.282 mm and the radius of curvature of the third image-side surface is-20.575 mm. The center thickness of the first lens is 4mm, the center thickness of the second lens is 3.8mm, and the center thickness of the third lens is 4mm; the center spacing between the first lens and the second lens is 2.8mm, and the center spacing between the second lens and the third lens is 2.2mm.
The effective focal length f=19 mm, aperture size fno=1.00, field angle fov=22.6° ×18.2° and total optical length ttl=17.2 mm of the optical lens, and other parameters of the optical lens:
focal length: 19mm
An aperture: 1.0
The detector comprises: 640 x 512 12um
Working wavelength: 8-14um
Focusing distance: 0.5m- ≡
Coating: AR (augmented reality)
Average transmission distance: > 95%
Maximum angle of view: 22.6 ° ×18.2°
Application scene: a seeker, munitions, sighting classes.
As shown in fig. 2, the MTF curve overall is less than the existing 19mm lens 0.12OTF coefficient; as shown in fig. 3, the RMS radius is generally less than 0.72 for a 19mm market lens; as shown in fig. 4, the maximum field angle is larger than 0.5 degrees of a 19mm lens on the market, and the distortion is smaller than 0.01mm; as shown in fig. 5, the relative illuminance was kept uniform at 100%.
Claims (9)
1. A miniature infrared optical lens, characterized by: the lens comprises a first lens, a second lens and a third lens which are sequentially arranged along the transmission direction of an incident light beam; along the transmission direction of the incident light beam, two surfaces of the first lens are a first object side surface and a first image side surface in sequence, two surfaces of the second lens are a second object side surface and a second side surface in sequence, and two surfaces of the third lens are a third object side surface and a third image side surface in sequence; the first lens element with positive refractive power has a convex first object-side surface and a concave first image-side surface; the second lens is a meniscus type positive lens with positive refractive power, the second object side surface is a convex surface, and the second image side surface is a concave surface; the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface; the small infrared optical lens satisfies the following relation: 56.91/mm < TTL/ImgH/f < 57.97/mm and FNO=1.00; wherein, TTL is the distance between the first object side surface and the image surface of the optical lens on the optical axis, imgH is the radius of the effective imaging circle of the optical lens, f is the effective focal length of the optical lens, and FNO is the f-number of the optical lens.
2. A compact infrared optical lens as recited in claim 1, characterised in that: the following relationship is satisfied: 0.85 < |f12/f| < 14; wherein f12 is a combined focal length of the first lens and the second lens.
3. A compact infrared optical lens as claimed in claim 1 or 2, characterized in that: the first image side surface is a diffraction surface; the second image side surface and the third object side surface are aspheric.
4. A compact infrared optical lens as claimed in claim 1 or 2, characterized in that: the following relationship is satisfied: R31/R32 is more than 1.72 and less than 2.11; wherein R31 is a radius of curvature of the third object-side surface at the optical axis, and R32 is a radius of curvature of the third image-side surface at the optical axis.
5. A compact infrared optical lens as claimed in claim 1 or 2, characterized in that: the following relationship is satisfied: CT3/BF is more than 0.4 and less than 0.79; wherein, CT3 is the center thickness of the third lens element, BF is the minimum distance between the image side surface of the third lens element and the image plane of the optical lens element on the optical axis.
6. A compact infrared optical lens as claimed in claim 1 or 2, characterized in that: the first lens L1, the second lens L2 and the third lens L3 are all made of chalcogenide glass.
7. A compact infrared optical lens as claimed in claim 1 or 2, characterized in that: the curvature radius of the first object side surface is 13.105 plus or minus 0.002mm, and the curvature radius of the first image side surface is 12.033 plus or minus 0.002mm; the curvature radius of the second object side surface is 20.323 plus or minus 0.002mm, and the curvature radius of the second image side surface is 19.625 plus or minus 0.002mm; the radius of curvature of the third object side surface is-43.282 + -0.002 mm, and the radius of curvature of the third image side surface is-20.575 + -0.002 mm.
8. A compact infrared optical lens as claimed in claim 1 or 2, characterized in that: the center thickness of the first lens is 4.00 plus or minus 0.02mm, the center thickness of the second lens is 3.80 plus or minus 0.02mm, and the center thickness of the third lens is 4.00 plus or minus 0.02mm; the center interval between the first lens and the second lens is 2.80 + -0.02 mm, and the center interval between the second lens and the third lens is 2.20 + -0.02 mm.
9. A compact infrared optical lens as claimed in claim 1 or 2, characterized in that: the effective focal length f=19 mm, the aperture size fno=1.00, the field angle fov=22.6° 18.2 °, the total optical length ttl=17.2 mm, the working wavelength: 8-14um, suitable for 640 x 512 12um detectors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210278599.XA CN114690379B (en) | 2022-03-21 | 2022-03-21 | Small-sized infrared optical lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210278599.XA CN114690379B (en) | 2022-03-21 | 2022-03-21 | Small-sized infrared optical lens |
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| CN114690379A CN114690379A (en) | 2022-07-01 |
| CN114690379B true CN114690379B (en) | 2024-03-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010164960A (en) * | 2008-12-16 | 2010-07-29 | Fujinon Corp | Imaging lens and image capturing apparatus using the same |
| JP2011253006A (en) * | 2010-06-01 | 2011-12-15 | Fujifilm Corp | Infrared imaging lens and imaging apparatus |
| TW201917442A (en) * | 2017-10-26 | 2019-05-01 | 新鉅科技股份有限公司 | Three-piece infrared single wavelength projection lens system |
| CN111273430A (en) * | 2018-12-04 | 2020-06-12 | 新巨科技股份有限公司 | Three-piece infrared single-wavelength projection lens set |
| CN112987252A (en) * | 2021-03-05 | 2021-06-18 | 江西晶超光学有限公司 | Optical system, infrared receiving module and electronic equipment |
-
2022
- 2022-03-21 CN CN202210278599.XA patent/CN114690379B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010164960A (en) * | 2008-12-16 | 2010-07-29 | Fujinon Corp | Imaging lens and image capturing apparatus using the same |
| JP2011253006A (en) * | 2010-06-01 | 2011-12-15 | Fujifilm Corp | Infrared imaging lens and imaging apparatus |
| TW201917442A (en) * | 2017-10-26 | 2019-05-01 | 新鉅科技股份有限公司 | Three-piece infrared single wavelength projection lens system |
| CN111273430A (en) * | 2018-12-04 | 2020-06-12 | 新巨科技股份有限公司 | Three-piece infrared single-wavelength projection lens set |
| CN112987252A (en) * | 2021-03-05 | 2021-06-18 | 江西晶超光学有限公司 | Optical system, infrared receiving module and electronic equipment |
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