CN108681037B - Visible and infrared synchronous imaging lens - Google Patents
Visible and infrared synchronous imaging lens Download PDFInfo
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- CN108681037B CN108681037B CN201810771512.6A CN201810771512A CN108681037B CN 108681037 B CN108681037 B CN 108681037B CN 201810771512 A CN201810771512 A CN 201810771512A CN 108681037 B CN108681037 B CN 108681037B
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- positive focal
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- 238000003384 imaging method Methods 0.000 title claims abstract description 23
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 10
- 230000004075 alteration Effects 0.000 claims description 27
- 230000003287 optical effect Effects 0.000 claims description 26
- 201000009310 astigmatism Diseases 0.000 claims description 6
- 206010010071 Coma Diseases 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 230000010354 integration Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 239000003086 colorant Substances 0.000 description 6
- 230000004927 fusion Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 206010073261 Ovarian theca cell tumour Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 208000001644 thecoma Diseases 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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- 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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Lenses (AREA)
Abstract
A visible and infrared synchronous imaging lens sequentially comprises from an object side to an image side: the system comprises a first lens group with positive focal power, a diaphragm, a second lens group with positive focal power, a beam-splitting prism and a visible light image acquisition mechanism and an infrared light image acquisition mechanism which are respectively arranged on two output surfaces of the beam-splitting prism. The invention has the advantages of large aperture, ultrahigh image quality, small volume, synchronous imaging of visible light and infrared light, consistent picture and easy integration of visible light and infrared light.
Description
Technical Field
The invention relates to a technology in the field of optical devices, in particular to a visible and infrared synchronous imaging lens.
Background
The existing security monitoring imaging device can effectively monitor the night field through the introduction of infrared images. However, the image under infrared loses the color difference information, the picture is black and white, which is not easy to distinguish as visible, and the single lens can not use the infrared mode at the same time when the visible mode is started. Even if two lenses are used for imaging one visible image and one infrared image, the volume cost is increased, and the visible image and the infrared image are not easy to fuse in the mode due to parallax.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides a visible and infrared synchronous imaging lens which has large aperture, ultrahigh image quality, small volume, visible and infrared synchronous imaging, consistent picture and easy visible and infrared fusion.
The invention is realized by the following technical scheme:
the invention sequentially comprises the following steps from an object side to an image side: the system comprises a first lens group with positive focal power, a diaphragm, a second lens group with positive focal power, a beam-splitting prism and a visible light image acquisition mechanism and an infrared light image acquisition mechanism which are respectively arranged on two output surfaces of the beam-splitting prism.
The visible light image acquisition mechanism comprises: an infrared cut filter and a visible image sensor.
The infrared light image acquisition mechanism includes: a visible light cut-off filter and an infrared image sensor.
The infrared cut-off filter and the visible light cut-off filter are fixed on the machine component in a dispensing mode.
The visible sensor and the infrared sensor are both pre-focused in an AA focusing mode and then fixed in the lens in a dispensing mode.
The light splitting prism comprises two right-angle prisms which are glued with each other, and the glued surface of the light splitting prism has the effect of transmitting visible reflection infrared rays, so that the same light path is divided into two visible light paths and infrared light paths.
The first lens group at least comprises: two lenses having positive optical power and two lenses having negative optical power, specifically, the lens sequentially comprises, from an object side to an image side: a first lens having positive optical power for distortion control, a second lens having negative optical power, a third lens having negative optical power, and a fourth lens having positive optical power.
The second lens group at least comprises: one cemented lens with positive optical power and two non-cemented lenses with positive optical power, specifically, the lens comprises, in order from the object side to the image side: a cemented lens comprising a convex lens and a concave lens, and two lenses with positive focal power for field curvature and astigmatism correction.
The convex lens meets the requirements of 1.47< Nd2<1.7, 60< Vd2<85, is a low-dispersion material, and can effectively correct spherical aberration and coma aberration under a wide wave band, so that an imaging picture is clear.
The ratio of the focal length of the cemented lens to the effective focal length of the lens is 2< f21/f <3;
the ratio of the focal length of two lenses with positive focal power to the effective focal length in the second lens group is 2.3< f23/f <2.9, and 1.8< f24/f <2.4, so that the reasonable distribution of the focal power of the lenses is ensured.
The variation of the refractive index of the last lens in the second lens group along with the temperature satisfies dn/dt <0 to ensure that the lens is used for compensating the influence of temperature variation on the performance of the optical path, so that the lens is free from virtual focus at high and low temperatures, and the purpose of using in more complex environments is achieved.
The ratio of the focal length of the second lens group to the effective focal length is 1.6< f2/f <2, so that the optical power of the lens is reasonably distributed, and the aberration caused by a large aperture is better corrected.
The ratio of the total length of the lens to the effective focal length is 6.1< TTL/f <6.6.
The ratio of the image plane height of the lens to the effective focal length of the lens is 1< IMH/f <1.2 so as to limit the angle range of the lens.
Technical effects
Compared with the prior art, the aperture F# -1.2 has ultra-high definition image quality, the same lens is respectively imaged in the infrared and visible directions through the beam-splitting prism, imaging pictures are synchronous, the infrared and visible pictures can be independent pictures, high-brightness color pictures can be formed after fusion, and the size of the lens is greatly reduced. In addition, the two sensors are fixed by adopting an AA focusing technology, so that the precision is high, the consistency of the optical centers of the two sensors is ensured, and the fusion of pictures is facilitated.
Drawings
FIG. 1 is a semi-sectional view of example 1;
fig. 2 is an aberration diagram of example 1;
FIG. 3 is a graph of color difference of light ray of example 1;
FIG. 4 is a semi-sectional view of example 2;
fig. 5 is an aberration diagram of example 2;
FIG. 6 is a graph of color difference of light ray of example 2;
FIG. 7 is a semi-sectional view of example 3;
fig. 8 is an aberration diagram of example 3;
FIG. 9 is a graph of color difference of light ray of example 3;
FIG. 10 is a schematic diagram of the mechanism assembly of the present invention;
In the figure: the first to second lens groups G1, G2, the beam splitter prism P, the stop STO, the infrared cut filter FT1, the visible cut filter FT2, and the first to eighth lenses L1 to L8.
Detailed Description
Example 1
As shown in fig. 1, the present embodiment includes: the lens comprises a first lens group G1 with positive focal power, a diaphragm STO, a second lens group G2 with positive focal power, a beam splitting prism P, and a visible light image acquisition mechanism and an infrared light image acquisition mechanism which are respectively arranged on two output surfaces of the beam splitting prism.
The first lens group G1 includes: a first lens L1 having positive optical power, a second lens L2 having negative optical power, a third lens L3 having negative optical power, and a fourth lens L4 having positive optical power.
The second lens group G2 includes: a fifth lens L5 having positive optical power, a sixth cemented lens L6 having negative optical power, a seventh lens L7 having positive optical power, and an eighth lens L8 having positive optical power; wherein the fifth and sixth lenses are cemented lenses.
The optical characteristic parameters of the lens of this embodiment are specifically: f=6mm; f# =1.2; TTL/f=6.6; IMH/f=1.1; f2/f=1.7; f23/f=2.7; f24/f=2.2;
Fig. 2 is an aberration diagram of the present embodiment, including: axial chromatic aberration, curvature of field and distortion. As can be seen from the figure, the axial chromatic aberration of the RGB three colors of the lens is well corrected, clear imaging can be realized, and in addition, the axial chromatic aberration of infrared light is well corrected, so that clear imaging of infrared light can be realized; the field curvature curve can be seen that the T line and the S line are well converged, the field curvature and the astigmatism are excellent, and the requirement of uniform imaging of the whole picture is ensured; the distortion curve shows that the lens achieves no distortion.
Fig. 3 is a light color difference chart of the embodiment, and as shown in the drawing, the embodiment well corrects the multiplying power color difference and the coma aberration of the RGB three colors, and meets the requirement of high pixels.
Example 2
As shown in fig. 4, in the present embodiment, compared with embodiment 1, a lens Lx having positive power for correcting chromatic aberration and curvature of field is added between a second lens L2 having negative power and a third lens L3 having negative power of the first lens group G1.
The optical characteristic parameters of the lens of this embodiment are specifically: f=5.8 mm; f# =1.15; TTL/f=6.2; IMH/f=1.15; f2/f=1.9; f23/f=2.9; f24/f=2;
Fig. 5 is an aberration diagram of the present embodiment, including: axial chromatic aberration, curvature of field and distortion. As can be seen from the figure, the axial chromatic aberration of the RGB three colors of the lens is well corrected, clear imaging can be realized, and in addition, the axial chromatic aberration of infrared light is well corrected, so that clear imaging of infrared light can be realized; the field curvature curve can be seen that the T line and the S line are well converged, the field curvature and the astigmatism are excellent, and the requirement of uniform imaging of the whole picture is ensured; the distortion curve shows that the lens achieves no distortion.
Fig. 6 is a light color difference diagram of the present embodiment, and as shown in the drawing, the present embodiment well corrects the chromatic aberration of magnification and coma of RGB three colors, so as to meet the requirement of high pixels.
Example 3
As shown in fig. 7, in the present embodiment, compared with embodiment 1, a lens Lx having positive power for correcting chromatic aberration and astigmatism is added between a third lens L3 having negative power and a fourth lens L4 having positive power of the first lens group G1.
The optical characteristic parameters of the lens of this embodiment are specifically: f=6.2 mm; f# =1.1; TTL/f=6.4; IMH/f=1.05; f2/f=1.7; f23/f=2.5; f24/f=1.9;
Fig. 8 is an aberration diagram of the present embodiment, including: axial chromatic aberration, curvature of field and distortion. As can be seen from the figure, the axial chromatic aberration of the RGB three colors of the lens is well corrected, clear imaging can be realized, and in addition, the axial chromatic aberration of infrared light is well corrected, so that clear imaging of infrared light can be realized; the field curvature curve can be seen that the T line and the S line are well converged, the field curvature and the astigmatism are excellent, and the requirement of uniform imaging of the whole picture is ensured; the distortion curve shows that the lens achieves no distortion.
Fig. 9 is a light color difference diagram of the present embodiment, and as shown in the drawing, the present embodiment well corrects the chromatic aberration of magnification and coma of RGB three colors, so as to meet the requirement of high pixels.
Fig. 10 is a schematic diagram of the mechanism assembly of the present invention, specifically including a front-end compression ring S1, a lens barrel S2, a lens, a spacer ring, a tail plate S3, an infrared sensor plate S4, and a visible sensor plate S5; the filter disc is fixed on the lens cone and the tail plate in a dispensing mode; the front end compression ring S1 is fixed on the lens barrel S2 through threads; the infrared and visible sensors S4S5 are positioned by AA focusing, and are fixed on the tail plate S3 by dispensing.
The foregoing embodiments may be partially modified in numerous ways by those skilled in the art without departing from the principles and spirit of the invention, the scope of which is defined in the claims and not by the foregoing embodiments, and all such implementations are within the scope of the invention.
Claims (5)
1. The visible and infrared synchronous imaging lens is characterized by comprising a first lens group with positive focal power, a diaphragm, a second lens group with positive focal power, a beam-splitting prism, a visible light image acquisition mechanism and an infrared light image acquisition mechanism which are respectively arranged on two output surfaces of the beam-splitting prism from an object side to an image side in sequence;
The first lens group consists of a first lens with positive focal power for distortion control, a second lens with negative focal power, a third lens with negative focal power and a fourth lens with positive focal power from an object side to an image side in sequence; or the first lens group consists of a first lens with positive focal power for distortion control, a second lens with negative focal power, a lens with positive focal power for chromatic aberration correction and curvature of field, a third lens with negative focal power and a fourth lens with positive focal power from the object side to the image side in sequence; or the first lens group consists of a first lens with positive focal power for distortion control, a second lens with negative focal power, a third lens with negative focal power, a lens with positive focal power for chromatic aberration correction and curvature of field correction and a fourth lens with positive focal power from the object side to the image side in sequence;
The second lens group consists of a cemented lens with positive focal power and two non-cemented lenses with positive focal power;
The second lens group consists of a cemented lens consisting of a convex lens with positive focal power and a concave lens with negative focal power and two lenses with positive focal power for field curvature and astigmatism correction in sequence from an object side to an image side;
The ratio of the focal length of two lenses with positive focal power in the second lens group to the effective focal length of the lens is 2.3< f23/f < 2.9, 1.8< f24/f <2.4, f23 is the focal length of the third lens with positive focal power in the second lens group, f24 is the focal length of the fourth lens with positive focal power in the second lens group, and f is the focal length of the visible and infrared synchronous imaging lens;
The variation of the refractive index of the last lens in the second lens group along with the temperature satisfies dn/dt <0, so that the lens is ensured to compensate the influence of temperature variation on the performance of the optical path, and the lens is free from virtual focus at high and low temperatures;
The ratio of the focal length of the second lens group to the effective focal length of the lens is 1.6< f2/f <2, so that the reasonable distribution of the focal power of the lens is ensured.
2. The lens according to claim 1, wherein the visible light image capturing mechanism comprises: an infrared cut filter and a visible image sensor; the infrared light image acquisition mechanism includes: a visible light cut-off filter and an infrared image sensor; the infrared cut-off filter and the visible light cut-off filter are fixed on the machine component in a dispensing mode; the visible image sensor and the infrared image sensor are both pre-focused in an AA focusing mode and then fixed in the lens in a dispensing mode.
3. The lens according to claim 1, wherein the beam splitting prism comprises two right angle prisms glued to each other, and the glued surface has an effect of transmitting visible reflected infrared rays, thereby dividing the same optical path into two optical paths of visible and infrared rays.
4. The lens according to claim 1, wherein the convex lens satisfies 1.47< Nd2<1.7, 60< vd2<85, is a low dispersion material, and can effectively correct spherical aberration and coma aberration in a wide band, so as to make an imaging picture clear, wherein Nd2 and Vd2 are respectively refractive index and dispersion coefficient of the convex lens.
5. The lens according to claim 1, wherein the ratio of the focal length of the cemented lens to the effective focal length of the lens is 2< f21/f <3; the ratio of the total length of the lens to the effective focal length of the lens is 6.1< TTL/f <6.6; the ratio of the image plane height of the lens to the effective focal length of the lens is 1< IMH/f <1.2 so as to limit the angle range of the lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771512.6A CN108681037B (en) | 2018-07-13 | 2018-07-13 | Visible and infrared synchronous imaging lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810771512.6A CN108681037B (en) | 2018-07-13 | 2018-07-13 | Visible and infrared synchronous imaging lens |
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| CN108681037A CN108681037A (en) | 2018-10-19 |
| CN108681037B true CN108681037B (en) | 2024-05-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110208923B (en) * | 2019-05-21 | 2021-04-06 | 浙江大华技术股份有限公司 | Imaging system and optical lens with same |
| CN110196484B (en) * | 2019-05-30 | 2020-06-23 | 浙江大华技术股份有限公司 | Lens |
| CN113011222B (en) * | 2019-12-19 | 2023-09-05 | 杭州海康威视数字技术股份有限公司 | Living body detection system, living body detection method and electronic equipment |
| CN110908095B (en) * | 2019-12-24 | 2023-05-26 | 协益电子（苏州）有限公司 | Small-view-field infrared monitoring and early warning lens |
| CN111610618B (en) * | 2020-06-30 | 2022-03-11 | 浙江大华技术股份有限公司 | Lens |
| CN112285906B (en) * | 2020-12-30 | 2021-04-16 | 宁波永新光学股份有限公司 | Ultra-high-definition wide-angle imaging optical system |
| CN114305350A (en) * | 2021-12-16 | 2022-04-12 | 上海掌门科技有限公司 | Pulse feeling equipment and method |
| CN114637099B (en) * | 2022-05-07 | 2022-11-08 | 荣耀终端有限公司 | Lens of terminal equipment, terminal equipment and control method of terminal equipment |
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| JPH11231215A (en) * | 1998-02-19 | 1999-08-27 | Fuji Xerox Co Ltd | Image forming lens |
| JP2000275516A (en) * | 1999-03-25 | 2000-10-06 | Tochigi Nikon Corp | Image pickup lens |
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