CN114967051B - Face recognition lens - Google Patents
Face recognition lens Download PDFInfo
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- CN114967051B CN114967051B CN202210372832.0A CN202210372832A CN114967051B CN 114967051 B CN114967051 B CN 114967051B CN 202210372832 A CN202210372832 A CN 202210372832A CN 114967051 B CN114967051 B CN 114967051B
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- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 43
- 239000000463 material Substances 0.000 claims description 19
- 238000003384 imaging method Methods 0.000 abstract description 18
- 238000005286 illumination Methods 0.000 abstract description 13
- 230000004075 alteration Effects 0.000 abstract description 4
- 239000013589 supplement Substances 0.000 abstract description 4
- 238000012938 design process Methods 0.000 abstract description 3
- 239000005304 optical glass Substances 0.000 abstract 1
- 238000003333 near-infrared imaging Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000010076 replication Effects 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
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention provides a face recognition lens, the focal length of the lens is 12.38mm, the F number is 2.5, the angle of view is 42 degrees, and the total optical length of the lens is 35.8mm; the light source works in a visible near infrared band, has a wavelength range of 400-1000 nm, can realize broadband imaging, and can adopt a near infrared lamp to supplement light in a low-illumination environment; the object distance of the face recognition lens is set to be 500mm, so that the use requirement of common scenes is met; the lens comprises 8 optical glass lenses, wherein 6 lenses are combined into 3 glued lenses in pairs, and all the lenses adopt standard spherical surfaces; all kinds of aberration are corrected in the lens design process, and the lens has the advantages of broadband imaging, large field angle, miniaturization and the like.
Description
Technical Field
The invention relates to the technical field of optical design, in particular to a face recognition lens.
Background
Face recognition is a biological recognition technology for carrying out identity recognition based on characteristic information of a face, and is widely applied in multiple fields at present. The face has the same characteristics of uniqueness and difficult replication as the fingerprint and the iris. The collection of face information is more convenient and succinct in comparison with the collection of fingerprint and iris information, need not the people who is gathered and deliberately cooperates collection equipment. The face information acquisition device is not required to be contacted during face information acquisition, and the face information acquisition device has remarkable advantages in the current epidemic prevention background. In addition, the face recognition has the advantages of concurrency, concealment and the like, so that the identification based on the face recognition has a plurality of advantages.
The traditional face recognition technology mainly carries out recognition of face characteristics based on images acquired by a visible light lens, and can be seen that the lens is used as acquisition equipment of face information and has important positions. The visible light lens images by means of visible light waves, and under the condition of insufficient illumination at night and the like, the imaging quality can be obviously reduced, so that the accuracy of face recognition is affected. If the face is illuminated by visible light for light filling, the person to be collected can feel glaring and dislike, so that the defect that the face image is collected by using the visible light lens can be seen.
At present, a face information acquisition technology based on a near infrared lens has become a mainstream. The near-infrared lens generally has higher imaging quality, and because near-infrared rays are not visible to human eyes, a near-infrared light source can be adopted for light supplementing when the illumination intensity is insufficient. In the invention, visible light imaging and near infrared imaging are combined, the face information can be mainly acquired by adopting visible light when the illumination is sufficient in daytime, and the face information can be acquired by adopting near infrared light supplementing and near infrared imaging modes when the illumination is insufficient at night.
Disclosure of Invention
The embodiment of the invention provides a face recognition lens, the working band range of the lens is covered with 400-1000 nm, when the illumination is sufficient, the face information is mainly collected by adopting visible light, when the illumination is insufficient, the face information is collected by supplementing light through a near infrared light source, and then the face information is mainly collected by means of near infrared light. The lens is designed by adopting spherical lenses, so that the processing difficulty and cost are reduced. All kinds of aberration are corrected in the lens design process, and finally the lens has the advantages of broadband imaging, large field angle, miniaturization and the like.
The embodiment of the invention provides a face recognition lens, which comprises a first negative lens, a second negative lens, a first positive lens, a third negative lens, a second positive lens, a third positive lens, a fourth negative lens and a fifth negative lens which are coaxially arranged in sequence along the incident direction of light rays. The material of the first negative lens is NSF64_SCHOTT, the light transmission caliber is 15.5mm and 16.5mm, and the thickness is 3mm and 4mm; the material of the second negative lens is SF4_SCHOTT, the light transmission caliber is 12mm <13mm, and the thickness is 2mm <3mm; the material of the first positive lens is SNBH 53-OHARA, the light transmission caliber is 9mm <10mm, and the thickness is 3.5mm <4.5mm; the material of the third negative lens is NSF10_SCHOTT, the light transmission caliber is 5mm <6mm, and the thickness is 3mm <4mm; the material of the second positive lens is NSSk2_SCHOTT, the aperture of the light passing aperture is 6mm and is 7mm, and the thickness of the second positive lens is 3.5mm and is 4.5mm; the material of the third positive lens is KSSk1_SUMITA, wherein 7mm < light transmission caliber <8mm, and 2.5mm < thickness <3.5mm; the fourth negative lens is made of NLAF 7-SCHOTT, wherein the light transmission caliber is 7.5mm and is 8.5mm, and the thickness is 1.5mm and is 2.5mm; the fifth negative lens is made of NLAF 2-SCHOTT, wherein the light transmission aperture is 7mm <8mm, and the thickness is 2mm <3mm.
Optionally, the light transmission caliber of the first negative lens is 15.89mm, and the thickness of the first negative lens is 3.50mm; the light transmission caliber of the second negative lens is 12.70mm, and the thickness of the second negative lens is 2.50mm; the light transmission caliber of the first positive lens is 9.41mm, and the thickness of the first positive lens is 4.00mm; the light transmission caliber of the third negative lens is 5.65mm, and the thickness of the third negative lens is 3.50mm; the light transmission caliber of the second positive lens is 6.54mm, and the thickness of the second positive lens is 3.94mm; the light transmission caliber of the third positive lens is 7.74mm, and the thickness of the third positive lens is 2.91mm; the light transmission caliber of the fourth negative lens is 7.97mm, and the thickness of the fourth negative lens is 2.00mm; the light transmission caliber of the fifth negative lens is 7.48mm, and the thickness of the fifth negative lens is 2.50mm.
Optionally, the first negative lens and the second negative lens form a cemented lens, the third negative lens and the second positive lens form a cemented lens, and the fourth negative lens and the fifth negative lens form a cemented lens.
Optionally, the distance between the center of the light emergent surface of the fifth negative lens and the image plane is 6mm, and the object distance of the lens is 500mm.
Optionally, the optical size of the face recognition lens is phi 16×35.8mm.
Optionally, the focal length of the optical system of the face recognition lens is 12.38mm, and the f number is 2.5.
Optionally, the working band range of the face recognition lens is 400 nm-1000 nm.
Optionally, the full field angle of the face recognition lens is 42 °.
From the above technical solutions, the embodiment of the present invention has the following advantages:
1. the face recognition lens has the working spectrum range of 400-1000 nm and has the advantage of broadband imaging. The visible light imaging and the near infrared imaging are combined, the visible light can be mainly adopted to collect the face information when the illumination is sufficient in the daytime, and the near infrared lamp is adopted to supplement light when the illumination is insufficient at night, so that the face information collection is realized through the near infrared light wave imaging.
2. The face recognition lens has the object distance set to be 500mm, and meets the use requirements of common scenes. All lenses of the lens are spherical, so that the processing difficulty is reduced, all aberrations are corrected in the design process, and the lens has good imaging quality. The focal length of the lens is 12.38mm, the F number is 2.5, the angle of view is 42 degrees, the total optical length of the lens is 35.8mm, and the lens has the advantages of large angle of view, miniaturization and the like.
Drawings
Fig. 1 is a light path structure diagram of a face recognition lens of the present invention.
Fig. 2 is a dot column diagram of the face recognition lens of the present invention.
Fig. 3 is an optical modulation transfer function of the face recognition lens of the present invention.
Reference numerals: 1-a first negative lens; 2-a second negative lens; 3-a first positive lens; 4-a third negative lens; STO-diaphragm surface; 5-a second positive lens; 6-a third positive lens; 7-a fourth negative lens; 8-a fifth negative lens; IMA-image plane.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.
Referring to fig. 1, which is a light path structure diagram of the present invention, the face recognition lens includes 8 lenses, and the 8 lenses are arranged in a negative-positive-negative form. The 8-piece lens comprises a first negative lens 1, a second negative lens 2, a first positive lens 3, a third negative lens 4, a second positive lens 5, a third positive lens 6, a fourth negative lens 7 and a fifth negative lens 8 which are coaxially arranged in sequence along the incidence direction of light rays, wherein the material of the first negative lens 1 is NSF64_SCHOTT, the light-transmitting caliber is 15.5mm <16.5mm, and the thickness is 3mm <4mm; the material of the second negative lens 2 is SF4_SCHOTT, the light transmission caliber is 12mm <13mm, and the thickness is 2mm <3mm; the material of the first positive lens 3 is SNBH 53-OHARA, wherein 9mm < light transmission caliber <10mm, and 3.5mm < thickness <4.5mm; the material of the third negative lens 4 is NSF10_SCHOTT, the light transmission caliber is 5mm <6mm, and the thickness is 3mm <4mm; the material of the second positive lens 5 is NSSk2_SCHOTT, the aperture of the light passing aperture is 6mm and is 7mm, and the thickness of the second positive lens is 3.5mm and is 4.5mm; the material of the third positive lens 6 is KSSk1_SUMITA, wherein 7mm < light transmission caliber <8mm,2.5mm < thickness <3.5mm; the fourth negative lens 7 is made of NLAF 7-SCHOTT, wherein the light-transmitting aperture is 7.5mm <8.5mm, and the thickness is 1.5mm <2.5mm; the fifth negative lens 8 is made of NLAF 2-SCHOTT, wherein the light transmission aperture is 7mm <8mm, and the thickness is 2mm <3mm.
In one embodiment, the light transmission aperture of the first negative lens 1 is 15.89mm, and the thickness is 3.50mm; the light transmission caliber of the second negative lens 2 is 12.70mm, and the thickness is 2.50mm; the light transmission caliber of the first positive lens 3 is 9.41mm, and the thickness is 4.00mm; the light transmission caliber of the third negative lens 4 is 5.65mm, and the thickness is 3.50mm; the light transmission caliber of the second positive lens 5 is 6.54mm, and the thickness is 3.94mm; the light transmission caliber of the third positive lens 6 is 7.74mm, and the thickness is 2.91mm; the light transmission caliber of the fourth negative lens 7 is 7.97mm, and the thickness is 2.00mm; the light transmission caliber of the fifth negative lens 8 is 7.48mm, and the thickness is 2.50mm. Therefore, the focal length of the face recognition lens is 12.38mm, the F number is 2.5, the angle of view is 42 degrees, the total optical length of the lens is 35.8mm, and the face recognition lens has the advantages of large angle of view, miniaturization and the like.
In one embodiment, the first negative lens and the second negative lens form a cemented lens, the third negative lens and the second positive lens form a cemented lens, and the fourth negative lens and the fifth negative lens form a cemented lens, so that chromatic aberration of the optical system is well corrected by matching optical materials of the cemented lenses.
In one embodiment, the working spectrum range of the face recognition lens is 400 nm-1000 nm, and the face recognition lens has the advantage of broadband imaging. The visible light imaging and the near infrared imaging are combined, the visible light can be mainly adopted to collect the face information when the illumination is sufficient in the daytime, and the near infrared lamp is adopted to supplement light when the illumination is insufficient at night, so that the face information collection is realized through the near infrared light wave imaging.
In the embodiment of the invention, the object distance of the face recognition lens is 500mm, and the requirements of common use scenes are met.
Referring to fig. 2, which is a point column diagram of the face recognition lens of the present invention, it can be seen from the figure that the image point speckle RMS is smaller than 15 μm under each view field, which indicates that the imaging quality of the lens is good.
Referring to fig. 3, for the optical modulation transfer function MTF of the face recognition lens of the present invention, it can be seen from the figure that the MTF of each field of view is substantially higher than 0.2 in the spatial frequency range within 120cycles/mm, so as to meet the basic requirements of the optical lens design.
Hereinafter, lens data of a face recognition lens is shown. Table 1 shows the optical parameters associated with each lens in the optical lens.
TABLE 1
The face recognition lens provided by the invention has the focal length of 12.38mm, the F number of 2.5, the angle of view of 42 degrees and the total optical length of the system of 35.8mm. The working band of the lens is a visible near infrared band, the wavelength range is 400-1000 nm, and the lens has the advantage of broadband imaging. The lens combines visible light imaging and near infrared imaging, mainly adopts visible light to collect face information when illumination is sufficient in daytime, adopts a near infrared lamp to supplement light when illumination intensity is insufficient at night, and realizes face information collection through near infrared light wave imaging. The lens has the advantages of broadband imaging, large field angle, miniaturization and the like.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any of various other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a face identification camera lens which characterized in that: the lens comprises a first negative lens, a second negative lens, a first positive lens, a third negative lens, a second positive lens, a third positive lens, a fourth negative lens and a fifth negative lens which are coaxially arranged in turn along the incidence direction of light rays;
the material of the first negative lens is NSF64_SCHOTT, the light transmission caliber is 15.5mm and 16.5mm, and the thickness is 3mm and 4mm;
the material of the second negative lens is SF4_SCHOTT, the light transmission caliber is 12mm <13mm, and the thickness is 2mm <3mm;
the material of the first positive lens is SNBH 53-OHARA, the light transmission caliber is 9mm <10mm, and the thickness is 3.5mm <4.5mm;
the material of the third negative lens is NSF10_SCHOTT, the light transmission caliber is 5mm <6mm, and the thickness is 3mm <4mm;
the material of the second positive lens is NSSk2_SCHOTT, the aperture of the light passing aperture is 6mm and is 7mm, and the thickness of the second positive lens is 3.5mm and is 4.5mm;
the material of the third positive lens is KSSk1_SUMITA, wherein 7mm < light transmission caliber <8mm, and 2.5mm < thickness <3.5mm;
the fourth negative lens is made of NLAF 7-SCHOTT, wherein the light transmission caliber is 7.5mm and is 8.5mm, and the thickness is 1.5mm and is 2.5mm;
the fifth negative lens is made of NLAF 2-SCHOTT, wherein the light transmission caliber is 7mm <8mm, and the thickness is 2mm <3mm;
the focal length of the optical system of the face recognition lens is 12.38mm, and the F number is 2.5.
2. The face recognition lens of claim 1, wherein:
the light transmission caliber of the first negative lens is 15.89mm, and the thickness of the first negative lens is 3.50mm;
the light transmission caliber of the second negative lens is 12.70mm, and the thickness of the second negative lens is 2.50mm;
the light transmission caliber of the first positive lens is 9.41mm, and the thickness of the first positive lens is 4.00mm;
the light transmission caliber of the third negative lens is 5.65mm, and the thickness of the third negative lens is 3.50mm;
the light transmission caliber of the second positive lens is 6.54mm, and the thickness of the second positive lens is 3.94mm;
the light transmission caliber of the third positive lens is 7.74mm, and the thickness of the third positive lens is 2.91mm;
the light transmission caliber of the fourth negative lens is 7.97mm, and the thickness of the fourth negative lens is 2.00mm;
the light transmission caliber of the fifth negative lens is 7.48mm, and the thickness of the fifth negative lens is 2.50mm.
3. The face recognition lens of claim 1, wherein: the first negative lens and the second negative lens form a cemented lens, the third negative lens and the second positive lens form a cemented lens, and the fourth negative lens and the fifth negative lens form a cemented lens.
4. The face recognition lens of claim 1, wherein: the distance between the center of the light emergent surface of the fifth negative lens and the image surface is 6mm, and the object distance of the lens is 500mm.
5. The face recognition lens of claim 1, wherein: the optical size of the face recognition lens is phi 16 multiplied by 35.8mm.
6. The face recognition lens of claim 1, wherein: the working band range of the face recognition lens is 400-1000 nm.
7. The face recognition lens of claim 1, wherein: the full field angle of the face recognition lens is 42 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372832.0A CN114967051B (en) | 2022-04-11 | 2022-04-11 | Face recognition lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372832.0A CN114967051B (en) | 2022-04-11 | 2022-04-11 | Face recognition lens |
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| CN114967051A CN114967051A (en) | 2022-08-30 |
| CN114967051B true CN114967051B (en) | 2023-11-10 |
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| CN202210372832.0A Active CN114967051B (en) | 2022-04-11 | 2022-04-11 | Face recognition lens |
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|---|---|---|---|---|
| JP2001124985A (en) * | 1999-10-28 | 2001-05-11 | Cosina Co Ltd | Wide-angle lens |
| WO2019235498A1 (en) * | 2018-06-04 | 2019-12-12 | 日精テクノロジー株式会社 | Wide-angle optical system and imaging device including same |
| CN110596860A (en) * | 2019-08-20 | 2019-12-20 | 江西联创电子有限公司 | High-pixel wide-angle lens and imaging device |
| CN111856729A (en) * | 2020-08-20 | 2020-10-30 | 江西特莱斯光学有限公司 | Wide-angle lens and camera device comprising same |
| CN112305711A (en) * | 2019-07-30 | 2021-02-02 | 康达智株式会社 | Camera lens |
| CN112505883A (en) * | 2020-12-04 | 2021-03-16 | 天津欧菲光电有限公司 | Optical system, image capturing module, electronic device and driving device |
| CN113376806A (en) * | 2021-06-18 | 2021-09-10 | 青岛理工大学 | Vehicle-mounted fixed-focus lens |
| CN113741015A (en) * | 2021-09-17 | 2021-12-03 | 青岛理工大学 | Miniaturized visible near-infrared image telecentric lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111596446B (en) * | 2020-07-27 | 2020-10-27 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
-
2022
- 2022-04-11 CN CN202210372832.0A patent/CN114967051B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001124985A (en) * | 1999-10-28 | 2001-05-11 | Cosina Co Ltd | Wide-angle lens |
| WO2019235498A1 (en) * | 2018-06-04 | 2019-12-12 | 日精テクノロジー株式会社 | Wide-angle optical system and imaging device including same |
| CN112305711A (en) * | 2019-07-30 | 2021-02-02 | 康达智株式会社 | Camera lens |
| CN110596860A (en) * | 2019-08-20 | 2019-12-20 | 江西联创电子有限公司 | High-pixel wide-angle lens and imaging device |
| CN111856729A (en) * | 2020-08-20 | 2020-10-30 | 江西特莱斯光学有限公司 | Wide-angle lens and camera device comprising same |
| CN112505883A (en) * | 2020-12-04 | 2021-03-16 | 天津欧菲光电有限公司 | Optical system, image capturing module, electronic device and driving device |
| CN113376806A (en) * | 2021-06-18 | 2021-09-10 | 青岛理工大学 | Vehicle-mounted fixed-focus lens |
| CN113741015A (en) * | 2021-09-17 | 2021-12-03 | 青岛理工大学 | Miniaturized visible near-infrared image telecentric lens |
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| CN114967051A (en) | 2022-08-30 |
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