CN114967052B - Fixed-focus video monitoring lens - Google Patents
Fixed-focus video monitoring lens Download PDFInfo
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- CN114967052B CN114967052B CN202210372903.7A CN202210372903A CN114967052B CN 114967052 B CN114967052 B CN 114967052B CN 202210372903 A CN202210372903 A CN 202210372903A CN 114967052 B CN114967052 B CN 114967052B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 52
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 17
- 238000003384 imaging method Methods 0.000 abstract description 32
- 238000005286 illumination Methods 0.000 abstract description 13
- 230000001502 supplementing effect Effects 0.000 abstract description 8
- 239000005304 optical glass Substances 0.000 abstract 1
- 238000003333 near-infrared imaging Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000000007 visual effect 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
- G02B13/002—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
- G02B13/0045—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 five or more 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
- G02B13/0015—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
- G02B13/008—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 fixed-focus video monitoring lens, which comprises 6 optical glass lenses, wherein the optical power is negative, positive and negative in sequence along the incident direction of light rays; the focal length of the lens is 14mm, the F number of the image space is 2.2, the angle of view is 32 degrees, and the total optical length of the system is 32.2mm; the lens works in a visible near infrared band, the working wavelength range is 400-1000 nm, clear imaging in a wide band can be realized, and near infrared lamps can be used for light supplementing in an night or low-illumination environment so as to ensure the imaging quality; the object distance of the lens is set to be 2.5m, and the lens is mainly used for video monitoring of the gate conditions of brand specialty shops and the like; the lens comprises 6 lenses, wherein 2 lenses form 1 glued lens, and all lenses adopt spherical surfaces; the lens has the advantages of broadband imaging, high-quality imaging, miniaturization and the like.
Description
Technical Field
The invention relates to the technical field of optical design, in particular to a fixed-focus video monitoring lens.
Background
The video monitoring lens is an important component part forming a safety precaution system and has important application value. With the proposal of the concept of smart city, the fields of smart transportation, public safety, visual management and the like are rapidly developed. The application of video monitoring in the public safety field is divided into a plurality of aspects, for example, video data obtained through a video monitoring lens can be used for investigation and evidence collection, and illegal behaviors are revealed through time, geography, space and other comparison analysis. Video data acquired by the public safety platform are stored in the video big data platform, and a face retrieval function can be realized through a stored face database, so that face analysis and comparison can be efficiently carried out. The sharpness of the video data directly affects whether the whole system can normally operate, and the quality of the video data is mainly determined by a video monitoring lens.
Currently, brand monopoly stores have higher and higher requirements for video monitoring at the gate, and the brand monopoly stores can analyze video data at the gate of the monopoly stores in a reasonable and legal manner, so as to guide the brand monopoly stores to provide more personalized services for consumers. The general video monitoring lens works in the visible light wave band, and can only guarantee imaging quality in a light supplementing mode at night or when illumination is insufficient, but the adoption of visible light supplementing is easy to cause dazzling feeling to consumers, so that the store entering experience of the consumers is influenced.
At present, video monitoring is not rare by adopting a near infrared lens, and the near infrared lens adopts infrared light to image, so that good imaging quality can be ensured. The near infrared imaging has the greatest advantages that the near infrared lamp can be adopted for light supplementing when the illumination intensity is insufficient, the imaging quality is ensured, and the near infrared imaging is harmless and not glaring to human eyes. The invention combines visible light imaging and near infrared imaging, designs a visible near infrared Jiao Shipin monitoring lens, performs video monitoring through visible light when the illumination is sufficient, supplements light through an infrared lamp when the illumination is insufficient, and realizes video monitoring through infrared light imaging.
Disclosure of Invention
The embodiment of the invention provides a fixed-focus video monitoring lens, which has the working wavelength range of 400-1000 nm, adopts visible light to carry out video monitoring when the illumination condition is good, carries out light supplementing through a near infrared lamp when the illumination condition is bad, and then carries out video monitoring through near infrared light. The lens is designed by adopting 6 spherical lenses, and has lower processing difficulty and cost. When the lens is designed, all aberrations are corrected and balanced, and the final lens has the advantages of broadband imaging, high-quality imaging, miniaturization and the like.
The embodiment of the invention provides a fixed focus video monitoring lens, which comprises a first negative lens, a first positive lens, a second negative lens, a second positive lens, a third positive lens and a third negative lens which are coaxially arranged in sequence along the incidence direction of light rays; the material of the first negative lens is HZF1A_CDGM, the light-transmitting caliber is 14.0mm <15.0mm, and the thickness is 4.0mm <5.0mm; the material of the first positive lens is NLAF 2-SCHOTT, the light-transmitting caliber is 6.0mm <7.0mm, and the thickness is 3.5mm <4.5mm; the material of the second negative lens is ZF5_CDGM, the light transmission caliber is 5.0mm and is 6.0mm, and the thickness is 1.0mm and is 2.0mm; the second positive lens is made of SLAL 56-OHARA, wherein the aperture of the light passing aperture is 6.5mm and the thickness of the light passing aperture is 7.5mm and the thickness of the light passing aperture is 3.5mm and the thickness of the light passing aperture is 4.5mm; the material of the third positive lens is NLAF 2-SCHOTT, wherein the light transmission caliber is 7.5mm and is 8.5mm, and the thickness is 2.5mm and is 3.5mm; the material of the third negative lens is SF4_SCHOTT, the light transmission caliber is 7.5mm and is 8.5mm, and the thickness is 3.0mm and is 4.0mm.
Optionally, the light transmission caliber of the first negative lens is 14.2mm, and the thickness of the first negative lens is 4.5mm; the light transmission caliber of the first positive lens is 9.1mm, and the thickness of the first positive lens is 4.0mm; the light transmission caliber of the second negative lens is 5.4mm, and the thickness of the second negative lens is 1.5mm; the light transmission caliber of the second positive lens is 7.3mm, and the thickness of the second positive lens is 4.3mm; the light transmission caliber of the third positive lens is 8.1mm, and the thickness of the third positive lens is 2.9mm; the light transmission caliber of the third negative lens is 8.1mm, and the thickness of the third negative lens is 3.5mm.
Optionally, the second negative lens and the second positive lens form a cemented lens.
Optionally, a distance between a center of the light exit surface of the third negative lens and the image plane is 6mm.
Optionally, the optical external dimension of the Jiao Shipin monitoring lens is set to be phi 14.2 multiplied by 32.2mm.
Optionally, the system focal length of the Jiao Shipin monitoring lens is 14mm and the F number is 2.2.
Optionally, the working band range of the Jiao Shipin monitoring lens is 400-1000 nm.
Optionally, the lens is positioned Jiao Shipin to monitor 32 ° of the full field of view of the lens.
From the above technical solutions, the embodiment of the present invention has the following advantages:
1. the constant Jiao Shipin monitoring lens has the working band range of 400-1000 nm and has the advantage of visible near infrared broadband imaging. The visible light imaging and the near infrared imaging are combined, video monitoring is achieved through the visible light imaging when illumination is sufficient, and the near infrared lamp is used for light supplementing when illumination is insufficient, and video monitoring is achieved mainly through the near infrared light wave imaging.
2. The fixed Jiao Shipin monitoring lens has an object distance of 2.5m and meets the use requirement of video monitoring at the gate of a brand specialty store. The lens is all spherical glass lenses, so that the processing difficulty and cost are reduced, all types of aberration are corrected and balanced during design, and the imaging quality of the lens is good. The focal length of the lens is 14mm, the F number is 2.2, the angle of view is 32 degrees, the total optical length of the lens is 32.2mm, and the lens has the advantages of high imaging quality, miniaturization and the like.
Drawings
Fig. 1 is a diagram showing an optical path structure of a constant Jiao Shipin monitoring lens according to the present invention.
Fig. 2 is a point diagram of a constant Jiao Shipin monitoring lens of the present invention.
Fig. 3 is a graph showing the optical modulation transfer function of the constant Jiao Shipin monitoring lens of the present invention.
Reference numerals: 1-a first negative lens; 2-a first positive lens; STO-diaphragm; 3-a second negative lens; 4-a second positive lens; 5-a third positive lens; 6-a third 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, the optical path structure diagram of the present invention is shown, the constant Jiao Shipin monitoring lens comprises 6 glass lenses, which are arranged in a negative positive negative form, and all lenses adopt spherical surfaces, so as to reduce processing difficulty and cost and ensure good imaging quality. The 6 glass lenses comprise a first negative lens 1, a first positive lens 2, a second negative lens 3, a second positive lens 4, a third positive lens 5 and a third negative lens 6 which are coaxially arranged in sequence along the incidence direction of light rays; the material of the first negative lens 1 is HZF1A_CDGM,14.0mm < light-transmitting aperture <15.0mm,4.0mm < thickness <5.0mm; the material of the first positive lens 2 is NLAF 2-SCHOTT, the light-transmitting caliber is 6.0mm <7.0mm, and the thickness is 3.5mm <4.5mm; the material of the second negative lens 3 is ZF5_CDGM, the light-transmitting caliber is 5.0mm and is 6.0mm, and the thickness is 1.0mm and is 2.0mm; the material of the second positive lens 4 is SLAl56_OHARA, the aperture of the light passing aperture is 6.5mm and the thickness of the light passing aperture is 7.5mm, and the thickness of the light passing aperture is 3.5mm and the thickness of the light passing aperture is 4.5mm; the material of the third positive lens 5 is NLAF 2-SCHOTT, wherein the light-transmitting caliber is 7.5mm and the light-transmitting caliber is 8.5mm, and the thickness is 2.5mm and the thickness is 3.5mm; the material of the third negative lens 6 is SF4_SCHOTT,7.5mm < light transmission caliber <8.5mm,3.0mm < thickness <4.0mm.
In one embodiment, the light transmission aperture of the first negative lens 1 is 14.2mm, and the thickness is 4.5mm; the light transmission caliber of the first positive lens 2 is 9.1mm, and the thickness is 4.0mm; the light transmission caliber of the second negative lens 3 is 5.4mm, and the thickness is 1.5mm; the light transmission caliber of the second positive lens 4 is 7.3mm, and the thickness is 4.3mm; the light transmission caliber of the third positive lens 5 is 8.1mm, and the thickness is 2.9mm; the light transmission caliber of the third negative lens 6 is 8.1mm, and the thickness is 3.5mm. Therefore, the system focal length of the fixed-focus video monitoring lens is 14mm, the F number is 2.2, the full-field angle is 32 degrees, the external dimension is phi 14.2 multiplied by 32.2mm, and the lens has the advantages of broadband imaging, high-quality imaging, miniaturization and the like.
In one embodiment, the second negative lens 3 and the second positive lens 4 form a cemented lens, and good correction of chromatic aberration of the lens is achieved by matching optical materials of the two lenses.
In one embodiment, the constant Jiao Shipin monitoring lens has the advantage of visible near infrared broadband imaging in the working band range of 400-1000 nm. The visible light imaging and the near infrared imaging are combined, video monitoring is achieved through the visible light imaging when illumination is sufficient, and the near infrared lamp is used for light supplementing when illumination is insufficient, and video monitoring is achieved mainly through the near infrared light wave imaging.
In the embodiment of the invention, the object distance of the Jiao Shipin monitoring lens is set to be 2.5m, so that the use requirement of video monitoring at the gate of a brand specialty store is met
Referring to fig. 2, a point diagram of the constant Jiao Shipin monitoring lens of the present invention is shown, and it can be seen from the figure that the corresponding imaging diffuse speckles RMS at each angle of view is smaller than 12 μm, which indicates that the imaging quality of the lens is good.
Referring to fig. 3, the optical modulation transfer function MTF of the constant Jiao Shipin monitoring lens of the present invention can be seen from the figure that the MTF of each field of view is higher than 0.2 in the spatial frequency range within 120cycles/mm, which meets the design requirement of the video monitoring lens.
Hereinafter, lens data of the monitor lens is shown as a flag Jiao Shipin. Table 1 shows the relevant optical parameters of each glass lens in the constant Jiao Shipin monitoring lens.
TABLE 1
The constant Jiao Shipin monitoring lens has the focal length of 14mm, the F number of 2.2, the angle of view of 32 degrees and the total optical length of the system of 32.2mm. The constant Jiao Shipin monitoring lens works in the visible near infrared band, has the wavelength range of 400-1000 nm, and has the advantage of broadband imaging. The visible light imaging and the near infrared imaging are combined, video monitoring is achieved through the visible light imaging when illumination is sufficient, and the near infrared lamp is used for light supplementing when illumination is insufficient, and video monitoring is achieved mainly through the near infrared light wave imaging. The lens has the advantages of broadband imaging, high-quality imaging, 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 (4)
1. A fixed focus video monitoring lens is characterized in that: the lens comprises a first negative lens, a first positive lens, a second negative lens, a second positive lens, a third positive lens and a third negative lens which are coaxially arranged in turn along the incidence direction of light rays;
the material of the first negative lens is HZF1A_CDGM, the light-transmitting caliber is 14.0mm <15.0mm, and the thickness is 4.0mm <5.0mm;
the material of the first positive lens is NLAF 2-SCHOTT, the light-transmitting caliber is 6.0mm <7.0mm, and the thickness is 3.5mm <4.5mm;
the material of the second negative lens is ZF5_CDGM, the light transmission caliber is 5.0mm and is 6.0mm, and the thickness is 1.0mm and is 2.0mm;
the second positive lens is made of SLAL 56-OHARA, wherein the aperture of the light passing aperture is 6.5mm and the thickness of the light passing aperture is 7.5mm and the thickness of the light passing aperture is 3.5mm and the thickness of the light passing aperture is 4.5mm;
the material of the third positive lens is NLAF 2-SCHOTT, wherein the light transmission caliber is 7.5mm and is 8.5mm, and the thickness is 2.5mm and is 3.5mm;
the material of the third negative lens is SF4_SCHOTT, the light transmission caliber is 7.5mm and is 8.5mm, and the thickness is 3.0mm and is 4.0mm;
the interval between the first negative lens and the first positive lens is 1.32mm, the interval between the first positive lens and the second negative lens is 3.90mm, the second negative lens and the second positive lens form a cemented lens, the interval between the second positive lens and the third positive lens is 0.10mm, and the interval between the third positive lens and the third negative lens is 0.10mm;
the distance between the center of the light emergent surface of the third negative lens and the image plane is 6mm;
the optical total length of the fixed Jiao Shipin monitoring lens is 32.2mm;
the system focal length of the constant Jiao Shipin monitoring lens is 14mm, and the F number is 2.2.
2. The constant Jiao Shipin monitoring lens of claim 1, wherein:
the light transmission caliber of the first negative lens is 14.2mm, and the thickness of the first negative lens is 4.5mm;
the light transmission caliber of the first positive lens is 9.1mm, and the thickness of the first positive lens is 4.0mm;
the light transmission caliber of the second negative lens is 5.4mm, and the thickness of the second negative lens is 1.5mm;
the light transmission caliber of the second positive lens is 7.3mm, and the thickness of the second positive lens is 4.3mm;
the light transmission caliber of the third positive lens is 8.1mm, and the thickness of the third positive lens is 2.9mm;
the light transmission caliber of the third negative lens is 8.1mm, and the thickness of the third negative lens is 3.5mm.
3. The constant Jiao Shipin monitoring lens of claim 1, wherein: the working wave band range of the Jiao Shipin monitoring lens is 400-1000 nm.
4. The constant Jiao Shipin monitoring lens of claim 1, wherein: the constant Jiao Shipin monitor lens has a full field of view of 32 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372903.7A CN114967052B (en) | 2022-04-11 | 2022-04-11 | Fixed-focus video monitoring lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210372903.7A CN114967052B (en) | 2022-04-11 | 2022-04-11 | Fixed-focus video monitoring lens |
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| CN114967052A CN114967052A (en) | 2022-08-30 |
| CN114967052B true CN114967052B (en) | 2023-09-15 |
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| CN113741013A (en) * | 2021-09-17 | 2021-12-03 | 青岛理工大学 | Telescope lens of visible light imaging spectrometer |
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| JP2015125150A (en) * | 2013-12-25 | 2015-07-06 | 富士フイルム株式会社 | Image-capturing lens and image-capturing device |
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2022
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| CN201273961Y (en) * | 2008-03-10 | 2009-07-15 | 富士能株式会社 | Image taking lens and image taking apparatus |
| CN103345043A (en) * | 2013-06-26 | 2013-10-09 | 东莞市宇瞳光学科技有限公司 | Day and night dual-purpose focusing monitoring camera |
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| CN114967052A (en) | 2022-08-30 |
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