CN114967051A - Face recognition lens - Google Patents
Face recognition lens Download PDFInfo
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- CN114967051A CN114967051A CN202210372832.0A CN202210372832A CN114967051A CN 114967051 A CN114967051 A CN 114967051A CN 202210372832 A CN202210372832 A CN 202210372832A CN 114967051 A CN114967051 A CN 114967051A
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- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 11
- 238000003384 imaging method Methods 0.000 abstract description 19
- 238000005286 illumination Methods 0.000 abstract description 14
- 239000013589 supplement Substances 0.000 abstract description 6
- 230000004075 alteration Effects 0.000 abstract description 4
- 238000012938 design process Methods 0.000 abstract description 3
- 239000005304 optical glass Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000003333 near-infrared imaging Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 210000000554 iris Anatomy 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 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
- 230000001502 supplementing effect Effects 0.000 description 1
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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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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
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- Lenses (AREA)
Abstract
The invention provides a face recognition lens, which has the focal length of 12.38mm, the F number of 2.5, the field angle of 42 degrees and the total optical length of 35.8 mm; the light source works in a visible near-infrared band, the wavelength range is 400 nm-1000 nm, broadband imaging can be achieved, and a near-infrared lamp can be used for light supplement 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 cemented lenses in pairs, and all the lenses adopt standard spherical surface shapes; all kinds of aberrations are corrected in the lens design process, and the lens has the advantages of wide-band 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 biometric technology for identity recognition based on feature information of a face, and is widely applied in various fields at present. The human face has the characteristics of uniqueness and difficulty in copying like fingerprints and irises. The collection of the face information is more convenient and simpler than the collection of fingerprint and iris information, and people who are collected do not need to be matched with the collection equipment intentionally. The face information is acquired without contacting acquisition equipment, and the method has remarkable advantages under the current epidemic prevention background. In addition, the face recognition also has the advantages of concurrency, concealment and the like, so that the identity authentication based on the face recognition has many advantages.
The traditional face recognition technology mainly recognizes the face features based on the image collected by the visible light lens, and the lens has an important position as a face information collecting device. The visible light lens carries out imaging by depending on visible light waves, and the imaging quality can be obviously reduced under the condition of insufficient illumination such as night and the like, so that the accuracy of face recognition is influenced. If the visible light is adopted to illuminate the human face for light supplement, the collected human can feel dazzling and disgusting, so that certain defects exist in the process of collecting the human face image by using the visible light lens.
At present, a face information acquisition technology based on a near infrared lens becomes a mainstream. The near-infrared lens generally has higher imaging quality, and because the human eyes can not see near-infrared light, the near-infrared light source can be adopted for light supplement when the illumination intensity is insufficient. The invention combines visible light imaging and near infrared imaging, and can mainly adopt visible light to collect face information when the illumination is sufficient in the daytime, and adopt near infrared complementary light and near infrared imaging to realize face information collection when the illumination is insufficient at night.
Disclosure of Invention
The embodiment of the invention provides a face recognition lens, wherein the working waveband range of the lens covers 400 nm-1000 nm, visible light is mainly adopted to collect face information when the illumination is sufficient, a near-infrared light source can be used for supplementing light when the illumination is insufficient, and then the face information is collected mainly 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 aberrations are corrected in the lens design process, and finally the lens has the advantages of wide-band 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 a light incidence direction. The first negative lens is made of NSF64_ SCHOTT, 15.5mm < the light-transmitting aperture <16.5mm, 3mm < the thickness <4 mm; the material of the second negative lens is SF4_ SCHOTT, the light-transmitting aperture is smaller than 13mm when the diameter is 12mm, and the thickness is smaller than 3mm when the diameter is 2 mm; the material of the first positive lens is SNBH53_ OHARA, 9mm < light-passing aperture <10mm, 3.5mm < thickness <4.5 mm; the third negative lens is made of NSF10_ SCHOTT, the light transmission aperture is smaller than 5mm and smaller than 6mm, and the thickness is smaller than 3mm and smaller than 4 mm; the material of the second positive lens is NSSK2_ SCHOTT, the light transmission aperture is 6mm <7mm, the thickness is 3.5mm <4.5 mm; the third positive lens is made of KSSK1_ SUMITA, the light transmission aperture is smaller than 8mm when the diameter of the third positive lens is 7mm, and the thickness is smaller than 3.5mm when the diameter of the third positive lens is 2.5 mm; the fourth negative lens is made of NLAF7_ SCHOTT, the light transmission aperture is smaller than 8.5mm when the thickness of the fourth negative lens is 7.5mm and is smaller than 2.5mm when the thickness of the fourth negative lens is 1.5 mm; the fifth negative lens is made of NLAF2_ SCHOTT, the light transmission aperture is 7mm <8mm, and the thickness is 2mm <3 mm.
Optionally, the clear aperture of the first negative lens is 15.89mm, and the thickness of the first negative lens is 3.50 mm; the clear aperture of the second negative lens is 12.70mm, and the thickness of the second negative lens is 2.50 mm; the light-transmitting aperture of the first positive lens is 9.41mm, and the thickness of the first positive lens is 4.00 mm; the light-transmitting aperture of the third negative lens is 5.65mm, and the thickness of the third negative lens is 3.50 mm; the light transmission aperture of the second positive lens is 6.54mm, and the thickness of the second positive lens is 3.94 mm; the light transmission aperture of the third positive lens is 7.74mm, and the thickness of the third positive lens is 2.91 mm; the light-transmitting aperture of the fourth negative lens is 7.97mm, and the thickness of the fourth negative lens is 2.00 mm; the light-transmitting aperture of the fifth negative lens is 7.48mm, and the thickness of the fifth negative lens is 2.50 mm.
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, a distance between the center of the light exit surface of the fifth negative lens and the image plane is 6mm, and an object distance of the lens is 500 mm.
Optionally, the optical size of the face recognition lens is phi 16 × 35.8 mm.
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 waveband range of the face recognition lens is 400 nm-1000 nm.
Optionally, the full field angle of the face recognition lens is 42 °.
According to the technical scheme, the embodiment of the invention has the following advantages:
1. the working spectral 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, the near infrared lamp is adopted to supplement the light when the illumination is insufficient at night, and the face information collection is realized through the near infrared light wave imaging.
2. The object distance of the face recognition lens is set to be 500mm, and the use requirement of common scenes is met. 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 viewing angle is 42 degrees, the optical total length of the lens is 35.8mm, and the lens has the advantages of large viewing angle, 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 point array 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-stop face; 5-a second positive lens; 6-a third positive lens; 7-a fourth negative lens; 8-a fifth negative lens; IMA-the image plane.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present 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-negative positive-negative form. The 8 lenses comprise 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 incident direction of light rays, wherein the first negative lens 1 is made of NSF64_ SCHOTT, the light transmission aperture is smaller than 16.5mm when the diameter is 15.5mm, and the thickness is smaller than 4mm when the diameter is 3 mm; the material of the second negative lens 2 is SF4_ SCHOTT, the light transmission aperture is 12mm <13mm, the thickness is 2mm <3 mm; the material of the first positive lens 3 is SNBH53_ OHARA, 9mm < the clear aperture <10mm, 3.5mm < the thickness <4.5 mm; the third negative lens 4 is made of NSF10_ SCHOTT, the light-transmitting aperture is 5mm <6mm, and the thickness is 3mm <4 mm; the material of the second positive lens 5 is NSSK2_ SCHOTT, 6mm < light-passing aperture <7mm, 3.5mm < thickness <4.5 mm; the third positive lens 6 is made of KSSK1_ SUMITA, the light transmission aperture is 7mm <8mm, the thickness is 2.5mm <3.5 mm; the fourth negative lens 7 is made of NLAF7_ SCHOTT, the light transmission aperture is smaller than 8.5mm when the thickness is smaller than 7.5mm and the thickness is smaller than 2.5mm when the thickness is 1.5 mm; the material of the fifth negative lens 8 is NLAF2_ SCHOTT, 7mm < the light-passing aperture <8mm, 2mm < the thickness <3 mm.
In one embodiment, the clear aperture of the first negative lens 1 is 15.89mm, and the thickness is 3.50 mm; the light-transmitting aperture of the second negative lens 2 is 12.70mm, and the thickness of the second negative lens is 2.50 mm; the light-transmitting aperture of the first positive lens 3 is 9.41mm, and the thickness of the first positive lens is 4.00 mm; the light-transmitting aperture of the third negative lens 4 is 5.65mm, and the thickness of the third negative lens is 3.50 mm; the light-transmitting aperture of the second positive lens 5 is 6.54mm, and the thickness of the second positive lens is 3.94 mm; the light-transmitting aperture of the third positive lens 6 is 7.74mm, and the thickness of the third positive lens is 2.91 mm; the light-transmitting aperture of the fourth negative lens 7 is 7.97mm, and the thickness of the fourth negative lens is 2.00 mm; the light-transmitting caliber of the fifth negative lens 8 is 7.48mm, and the thickness of the fifth negative lens is 2.50 mm. 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 optical total 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 can be well corrected through matching of optical materials of the cemented lens.
In one embodiment, the working spectral 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, the near infrared lamp is adopted to supplement the light when the illumination is insufficient at night, and 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, so that the requirement of common use scenes is met.
Please refer to fig. 2, which is a dot array diagram of the face recognition lens of the present invention, it can be seen from the diagram that the diffuse speckle RMS of the image points under each field of view is less than 15 μm, indicating that the imaging quality of the lens is good.
Referring to fig. 3, it can be seen that MTF of each field is substantially higher than 0.2 in the spatial frequency range within 120cycles/mm for the optical modulation transfer function MTF of the face recognition lens of the present invention, so as to meet the basic requirement of the optical lens design.
In the following, shot data of a face recognition shot is shown. Table 1 shows optical parameters associated with each lens in the optical lens.
TABLE 1
The human face recognition lens has the focal length of 12.38mm, the F number of 2.5, the field angle of 42 degrees and the total optical length of 35.8 mm. The working wave band of the lens is a visible near-infrared wave band, the wavelength range is 400 nm-1000 nm, and the lens has the advantage of broadband imaging. The lens combines visible light imaging and near-infrared imaging, visible light is mainly adopted to collect face information when the illumination is sufficient in the daytime, a near-infrared lamp is adopted to supplement light when the illumination is insufficient at night or the illumination intensity is insufficient, and the face information is collected through near-infrared light wave imaging. The lens has the advantages of wide-band imaging, large field angle, miniaturization and the like.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A face recognition lens is 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 sequence along the incident direction of light;
the first negative lens is made of NSF64_ SCHOTT, 15.5mm < the light-transmitting aperture <16.5mm, 3mm < the thickness <4 mm;
the material of the second negative lens is SF4_ SCHOTT, the light transmission aperture is 12mm <13mm, the thickness is 2mm <3 mm;
the material of the first positive lens is SNBH53_ OHARA, 9mm < light-passing aperture <10mm, 3.5mm < thickness <4.5 mm;
the third negative lens is made of NSF10_ SCHOTT, the light transmission aperture is smaller than 5mm and smaller than 6mm, and the thickness is smaller than 3mm and smaller than 4 mm;
the material of the second positive lens is NSSK2_ SCHOTT, the light transmission aperture is 6mm <7mm, the thickness is 3.5mm <4.5 mm;
the third positive lens is made of KSSK1_ SUMITA, the light-transmitting aperture of 7mm is smaller than 8mm, the thickness of 2.5mm is smaller than 3.5 mm;
the fourth negative lens is made of NLAF7_ SCHOTT, the light transmission aperture is smaller than 8.5mm when the thickness of the fourth negative lens is 7.5mm and is smaller than 2.5mm when the thickness of the fourth negative lens is 1.5 mm;
the fifth negative lens is made of NLAF2_ SCHOTT, the light transmission aperture is 7mm <8mm, and the thickness is 2mm <3 mm.
2. The face recognition lens of claim 1, wherein:
the light-transmitting aperture of the first negative lens is 15.89mm, and the thickness of the first negative lens is 3.50 mm;
the clear aperture of the second negative lens is 12.70mm, and the thickness of the second negative lens is 2.50 mm;
the light-transmitting aperture of the first positive lens is 9.41mm, and the thickness of the first positive lens is 4.00 mm;
the light-transmitting aperture of the third negative lens is 5.65mm, and the thickness of the third negative lens is 3.50 mm;
the light transmission aperture of the second positive lens is 6.54mm, and the thickness of the second positive lens is 3.94 mm;
the light transmission aperture of the third positive lens is 7.74mm, and the thickness of the third positive lens is 2.91 mm;
the light-transmitting aperture of the fourth negative lens is 7.97mm, and the thickness of the fourth negative lens is 2.00 mm;
the light-transmitting aperture of the fifth negative lens is 7.48mm, and the thickness of the fifth negative lens is 2.50 mm.
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 500 mm.
5. The face recognition lens of claim 1, wherein: the optical size of the face recognition lens is phi 16 multiplied by 35.8 mm.
6. The face recognition lens of claim 1, wherein: the focal length of an optical system of the face recognition lens is 12.38mm, and the F number is 2.5.
7. The face recognition lens of claim 1, wherein: the working waveband range of the face recognition lens is 400 nm-1000 nm.
8. The face recognition lens of claim 1, wherein: the full field angle of the face recognition lens is 42 °.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372832.0A CN114967051B (en) | 2022-04-11 | 2022-04-11 | Face recognition lens |
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| 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 true CN114967051A (en) | 2022-08-30 |
| CN114967051B CN114967051B (en) | 2023-11-10 |
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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 |
| US20220026671A1 (en) * | 2020-07-27 | 2022-01-27 | Changzhou Raytech Optronics Co., Ltd. | Camera optical lens |
-
2022
- 2022-04-11 CN CN202210372832.0A patent/CN114967051B/en active Active
Patent Citations (9)
| 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 |
| US20220026671A1 (en) * | 2020-07-27 | 2022-01-27 | Changzhou Raytech Optronics Co., Ltd. | Camera optical lens |
| 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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