CN103860147A - Method for manufacturing double-lens multi-spectral imaging lens set and vein display system thereof - Google Patents

Method for manufacturing double-lens multi-spectral imaging lens set and vein display system thereof Download PDF

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CN103860147A
CN103860147A CN201410126229.XA CN201410126229A CN103860147A CN 103860147 A CN103860147 A CN 103860147A CN 201410126229 A CN201410126229 A CN 201410126229A CN 103860147 A CN103860147 A CN 103860147A
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lens
light source
light
imaging lens
substrate
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CN103860147B (en
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金建
邸思
刘鹏
陈贤帅
杜如虚
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Shenzhen Institute of Advanced Technology of CAS
Guangzhou Institute of Advanced Technology of CAS
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Guangzhou Institute of Advanced Technology of CAS
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Abstract

The invention relates to a method for manufacturing a double-lens multi-spectral imaging lens set and a vein display system thereof. The vein display system comprises the double-lens multi-spectral imaging lens set, and further comprises a light source assembly, an image sensor, an image processing system and a display device. Two lenses in the double-lens multi-spectral imaging lens set respectively have an optical path, each lens can collect different light, one of the lenses is used for filtering near-infrared light and collecting visible light, and the other lens is used for filtering the visible light and collecting the near-infrared light. During one imaging, near-infrared images and visible light images can be obtained at the same time. The two lenses are identical in optical parameter, and the sizes and the positions of the images are basically consistent. Accordingly, the two lenses can be fused through an image processing technology conveniently, enhanced display of local veins of a human body can be achieved, the display effect close to that of human eye observation can be achieved as a whole, and medical staff are assisted in finding corresponding positions during vein puncture.

Description

The manufacture method of the multispectral imaging lens group of a kind of double lens and vein display system thereof
Technical field
The present invention relates to medical instruments field, be specifically related to manufacture method and the vein display system thereof of the multispectral imaging lens group of a kind of double lens.
Background technology
Before more than 100 year, the mankind's medical advance is used vessel puncture to draw blood and inputs blood, physiological saline and so on liquid to starting, but implementing the key of this Medical Technology, is exactly the blood vessel that first will manage to find human body, could play pin puncture vessel to carry out follow-up treatment.
The method of clinical used localization of blood vessel mainly contains two kinds:
1, visual method: with naked depending on finding and localization of blood vessel.This method is only suitable for venous locations and shows shallow and outstanding patient, for the state of hypodermic vessel size, bending and bifurcated, in fact cannot guarantee very clear.
2, digital palpation for examination of trauma: find and localization of blood vessel with the sensation touching.This method is that medical personnel rely on experience for many years, to touch the sensation of skin, tells blood vessel different from the matter of surrounding tissue, thereby determines position and the depth of blood vessel.
But when puncture to as if when child or overweight people because fat is thicker, blood vessel is difficult for seeing clearly, how to find blood vessel just to seem extremely important at patient rapidly and accurately.
Traditional vein display system is the near-infrared image by obtaining body local and realizes human body passages through which vital energy circulates by image processing techniques and highlight.This mode is completely based on near-infrared image data.Because human eye cannot be experienced near infrared light, therefore show that the observed result of result and human eye reality has significant difference.Although vein segment is highlighted, whole structure has feeling of unreality.
Application number is that 201310372128.6 Chinese invention patent application discloses a kind of vein visualizer and developing method, visualizer comprises optical system and a liquid crystal display systems for darker vein is developed, and optical system comprises near-infrared light source, vein image acquisition device; Vein image acquisition device divides reflected light to make two-way to separate near infrared light and visible ray, near-infrared reflection light has comprised compared with the information of depths (>3mm) vein, it is carried out carrying out image co-registration with visible images after figure image intensifying, and reference while being presented in LCDs for the puncture of doctor's row vein.It has adopted optical filter to realize separating of near infrared light and visible ray, but the light centrifugation of existing optical filter is very limited, has only realized the effect of getting rid of useless light, cannot carry out optically focused to useful light, have a strong impact on precision and the definition of image.
Summary of the invention
In view of this, be necessary for the defect existing in prior art, manufacture method and the vein display system thereof of the multispectral imaging lens group of a kind of double lens are provided, truly, the colored vein of accurate, clear, real-time demonstration human body, help medical personnel to carry out smoothly venipuncture, significantly improve success rate of venous puncture, shortening venipuncture time first.
For achieving the above object, the present invention is by the following technical solutions:
A manufacture method for the multispectral imaging lens group of double lens, comprising:
S1, get the transparent and surfacing of a slice sheet glass as substrate, sheet glass is cleaned to be placed in baking oven with clear water and acetone and toasts, remove steam and remaining acetone; After natural cooling, positive photoetching rubber is spun on sheet glass;
S2, the substrate of the good positive photoetching rubber of spin coating is toasted, remove the solvent in positive photoetching rubber; After having toasted, be placed in and under a mask plate, carry out uv-exposure; Wherein, the middle part of described mask plate has 2 lighttight border circular areas, and the remainder of mask plate is transparent;
S3, the substrate after good exposure is placed in to developer solution develops; Dissolve and remove the positive photoetching rubber part of exposing, the part being covered by the light tight border circular areas of mask plate in S2 leaves two cylindrical patterns;
In S4, substrate after development, plate the lighttight chromium film of one deck;
S5, substrate is placed in to acetone, two cylindrical patterns are dissolved in acetone, make to be plated in two chromium films on cylindrical pattern and be also stripped from removal simultaneously, expose the circular hole of two printing opacities;
S6, positive photoetching rubber is spun on to S5 processes in the substrate of post-drying, again after overbaking, under another mask plate, carry out uv-exposure by being placed in the substrate of positive photoetching rubber; Described another mask plate middle part has the border circular areas of 1 printing opacity, and the remainder of another mask plate is lighttight;
After S7, exposure are good, substrate is placed in to special developer solution and develops, the positive photoetching rubber through the circular hole place of overexposure is wherein dissolved and removed;
S8, nearly infrared cut-off light filtering films layer is coated on the circular hole place described in S7;
S9, repetition S6 to S7, expose to another circular hole, and remove positive photoetching rubber by developing solution dissolution; Then near infrared filter rete is coated on to another circular hole place;
S10, make two lens respectively, lens aperture size is identical with two circular hole sizes; By gummed, two lens are bonded in above-mentioned substrate, align with above-mentioned two circular holes in the position of lens.
In S1, on sheet glass, the method for spin coating positive photoetching rubber is first with the speed spin coating of 500 revs/min 10 seconds, then with the speed spin coating of 2500 revs/min 30 seconds.
In S1, the thickness of the positive photoetching rubber of spin coating is similar to 10 microns.
In S2, the time of exposure of uv-exposure is 25 seconds, and exposure intensity is 20mW/cm 2.
Be 850nm arrowband near infrared filter rete at the rete of infrared filtering described in S9.
In S10, described lens are convex lens.
A kind of vein display system, comprises the multispectral imaging lens group of double lens that adopts above-described method to make, and also comprises light source assembly, imageing sensor, image processing system and display device;
Described light source assembly is around being arranged at around the multispectral imaging lens group of double lens, and the light-emitting area of light source assembly is towards the plane of light incidence of the multispectral imaging lens group of double lens;
Described light source assembly comprises visible light source and near infrared light light source, described visible light source and near infrared light light source are fixed on a base, described base in the form of a ring, the light-emitting area of described visible light source and near infrared light light source is coniform and is arranged on base, described visible light source and near infrared light light source are LED lamp, and the centre wavelength of near-infrared light source is 850nm.
Between the beam projecting face of the multispectral imaging lens group of double lens and imageing sensor, be also provided with signal sealing coat; Described signal sealing coat middle part has two through holes, and through-hole aperture is less than or equal to the lens in the multispectral imaging lens group of double lens, and the position of the corresponding lens of each through hole arranges; The thickness of signal sealing coat is less than or equal to the focal length of lens.
Manufacture method and the vein display system thereof of the multispectral imaging lens group of a kind of double lens provided by the invention, in the multispectral imaging lens group of this double lens, two camera lenses have light path separately, each camera lens can carry out optically focused to different light, one of them camera lens is for filtering near infrared light, to visible light-focusing; Another camera lens is for filtering to visible ray, near infrared light optically focused.In Polaroid, can obtain near-infrared image and visible images simultaneously.Because these two lens optical parameters are identical, imaging size and position are also basically identical.Therefore can easily the two be merged by image processing techniques, the enhancing that so both can realize body local vein shows, can realize on the whole again the display effect close with eye-observation, more be conducive to assist personnel and in the time carrying out venipuncture, find correspondence position.
Accompanying drawing explanation
The schematic flow sheet of the manufacture method of the multispectral imaging lens group of a kind of double lens that Fig. 1 provides for the embodiment of the present invention one.
The structural representation of a kind of vein display system that Fig. 2 provides for the embodiment of the present invention two.
Fig. 3 is the structural representation of the light source assembly in the embodiment of the present invention two.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme of the present invention is elaborated.
Embodiment mono-
The embodiment of the present invention provides the manufacture method of the multispectral imaging lens group of a kind of double lens, and the multispectral imaging lens group of described double lens is for vein display system, and it comprises two camera lenses, and one of them camera lens is for filtering near infrared light, to visible light-focusing; Another camera lens is for filtering to visible ray, near infrared light optically focused.
As shown in Figure 1, the manufacture method of the multispectral imaging lens group of described double lens specifically comprises:
S1, get the high and surfacing of a slice light transmittance sheet glass 101 as substrate, after sheet glass 101 use clear water and acetone are cleaned, be placed in baking oven, at 130 ℃, toast and within 10 minutes, remove steam and remaining acetone; After natural cooling, positive photoetching rubber 102 is spun on this sheet glass 101, spin coating method is first with the speed spin coating of 500 revs/min 10 seconds, then with the speed spin coating of 2500 revs/min 30 seconds; Now the thickness of positive photoetching rubber 102 is 10 microns of left and right.Wherein, the positive photoetching rubber that the model that positive photoetching rubber 102 selects An Zhi company to produce is AZ4620.
S2, the substrate of the good positive photoetching rubber 102 of spin coating is placed in to 90 ℃ dries on platforms and toast 1 minute, for removing the solvent in positive photoetching rubber 102; After having toasted, be placed in uv-exposure under the mask plate of making in advance, time of exposure is 25 seconds, and exposure intensity is 20mW/cm 2.Wherein, the middle part of described mask plate has 2 lighttight border circular areas 103, and the remainder of mask plate is transparent.
S3, the substrate after good exposure is placed in to special developer solution develops.The positive photoetching rubber 102 of light of exposing to the sun can dissolve and remove under developer solution, and not have the place of exposing to remain.Wherein, the developer solution that the model that developer solution selects An Zhi company to produce is AZ400.After development, the part being covered by the light tight border circular areas 103 of mask plate in S2 can leave two cylindrical patterns 104, and positive photoetching rubber 102 around, owing to being exposed, is removed when development.
S4, by develop after substrate be placed in plated film in plasma sputter plated film machine, in substrate, entirety plates the lighttight chromium of one deck (Cr) film 105.Due to the protection of the cylindrical pattern 104 of making before, at 2 cylindrical pattern 104 places, 105 of chromium films have been plated in above positive photoetching rubber 102.
S5, substrate is placed in to acetone, the above-mentioned cylindrical pattern 104 being formed by AZ4620 positive photoetching rubber 102 can be dissolved in acetone, make plating chromium film 105 thereon also be stripped from removal simultaneously, now manifest the circular hole 106 of 2 printing opacities, respectively corresponding two camera lenses of these two circular holes 106, will be used for two different light splitting districts of follow-up making.Circular hole 106 is around the lighttight chromium film 105 of one deck, can play the object that stops veiling glare incident.
S6, AZ4620 positive photoetching rubber 102 is spun on to S5 processes in the substrate of post-drying, again after overbaking, under the mask plate of making in advance, carry out uv-exposure by being placed in the substrate of positive photoetching rubber 102.Wherein, spin coating method is with identical described in S1, and time of exposure and intensity are with identical described in S2.Mask plate middle part in this step has the border circular areas 107 of 1 printing opacity, and the remainder of mask plate is lighttight; The size of this border circular areas 107 is identical with border circular areas 103 sizes of mask plate in S2; When exposure, the border circular areas 107 of mask plate aligns with in two circular holes 106 that form in S5 one.
After S7, exposure are good, substrate is placed in to special developer solution and develops, the positive photoetching rubber 102 through circular hole 106 places of overexposure is wherein dissolved to removal, form plated film district 108.
S8, mode by sputter coating nearly infrared cut-off light filtering films floor 109 are coated in the plated film district 108 at the circular hole place described in S7.Wherein, described near infrared prevention filter membranous layer 109 is that the method for ending by interference designs and produces.
S9, repetition S6 to S7, expose to another circular hole, and remove positive photoetching rubber 102 by developing solution dissolution; Then by the mode of sputter coating, 850nm arrowband near infrared filter rete 110 is coated on to another circular hole place.Wherein, described 850nm arrowband near infrared filter rete 110 is made by induction transmission principle design.
S10, make respectively two convex lenss 111 by the mode of micro-injection moulding, the pore size of convex lens 111 is identical with two circular hole sizes.By gummed, two convex lenss 111 are bonded in above-mentioned substrate, align with above-mentioned two circular holes in the position of convex lens 111.Because convex lens 111 is larger, naked eyes can complete alignment step.
So far the making of the multispectral imaging lens group of double lens all completes.
Embodiment bis-
The embodiment of the present invention provides a kind of vein display system based on the multispectral imaging lens group of double lens, under once taking, obtain two pictures under this system simultaneously, one is the colour picture of the finding of naked eye that becomes under visible ray, another black and white picture that can show human vein for becoming under near infrared light.Then by particular image Processing Algorithm, first the vein in near-infrared image is extracted, then the vein of extraction is added on colour picture by image fusion technology, by real-time fusion image after treatment showing, so just can reduce really the distribution of human vein in display.By this system, the vein image of its demonstration can assist doctor carry out medical diagnosis on disease and have an injection, especially child, and its vein blood vessel is less, and this system can clearly display the position of vein.
As shown in Figure 2, a kind of vein display system that the embodiment of the present invention provides comprises: light source assembly 1, the multispectral imaging lens group 5 of double lens, signal sealing coat 2, imageing sensor 3, image processing system 4 and display device (not shown).
Described light source assembly 1 is around being arranged at around the multispectral imaging lens group 5 of double lens, the light-emitting area of light source assembly 1 is towards the plane of light incidence of the multispectral imaging lens group 5 of double lens the one side of convex lens (with), for sending visible ray and near infrared light to human body to be imaged 6, for the multispectral imaging lens group 5 of double lens provides image-forming condition.
Wherein, described light source assembly 1 comprises visible light source and near infrared light light source, and visible ray is for the macroscopic coloured image of auxiliary generation, and near infrared light is for the auxiliary near infrared light image generating with vein.Because the luminous efficiency of LED pipe is high, light is pure, photochromic quality is high; Energy consumption is little, and long working life is reliability and durability; Volume is little, is convenient to moulding; Safety is good, and running voltage and operating current are not high; Do not need to increase in addition optical filter.Therefore, the present embodiment selects LED array to form light source assembly 1.
Because deoxidation hematochrome in venous blood has the characteristic of absorption near infrared ray, therefore use specific wavelength near infrared light again, can obtain the picture rich in detail of vein.Under the near-infrared light source that to experimental results show that in centre wavelength be 850nm, irradiate in obtained vein image, vein blood vessel is more clear.Therefore, in the present embodiment, selecting centre wavelength is that the LED lamp of 850nm is as near-infrared light source.
Particularly, as shown in Figure 3, described visible light source and near infrared light light source are fixed on a base 10, and in the form of a ring, its middle part is used for installing the multispectral imaging lens group 5 of double lens to described base 10.The light-emitting area of described visible light source and near infrared light light source is coniform and is arranged on base 10.Visible light source and near infrared light light source mutually intersect or are uniformly distributed spaced reciprocally arrangement, when luminous, the light that visible light source and near infrared light light source send uniformly oblique angle is radiated at human body to be imaged 6 surfaces, and reflexes to the multispectral imaging lens group 5 of double lens.
The multispectral imaging lens group 5 of described double lens has two camera lenses, and one of them camera lens is for filtering near infrared light, to visible light-focusing; Another camera lens is for filtering to visible ray, near infrared light optically focused.Human body 6 to be imaged, under the irradiation of light source assembly 1, reflexes to the multispectral imaging lens group 5 of double lens by visible ray and near infrared light simultaneously, after the optically focused and optical filtering processing of two camera lenses, and independent output visible ray and near infrared light respectively.The manufacture method of the multispectral imaging lens group 5 of double lens describes in detail in embodiment mono-, does not repeat them here.
Described imageing sensor 3 is arranged at the beam projecting face (dorsad a side of convex lens) of the multispectral imaging lens group 5 of double lens, for the visible ray of two camera lenses outputs of multispectral double lens imaging lens group 5 and near infrared light being converted to respectively to visible images and the near infrared light image of digital signal form.
In the embodiment of the present invention, select CCD/CMOS chip as imageing sensor 3.Because needs gather near-infrared image, so the CCD/CMOS chip of selecting must be able to be responded to the spectrum of 400-1000nm.The CCD/CMOS chip size of selecting is in theory better because figure lens also can be done like this relatively larger, convex lens is larger, its image quality also can improve, but the price of large CCD/CMOS chip also can be relatively high.On market, the use of the CCD/CMOS chip of 2.3 inches is the most general, and therefore the embodiment of the present invention is chosen the CCD/CMOS chip of 2.3 inches big or small as imageing sensor 3.
As improvement, between the multispectral imaging lens group 5 of double lens and imageing sensor 3, be also provided with signal sealing coat 2, it is positioned over the beam projecting face of the multispectral imaging lens group 5 of double lens, for preventing the interference of information between two camera lenses.
Because the size of CCD/CMOS chip is restricted often, generally at 2.3 inches.In order to make full use of sensitive chip, between two camera lenses of the multispectral imaging lens group 5 of double lens, spacing can be less, easily causes the signal between different camera lenses to harass.Therefore, increase the phase mutual interference that signal sealing coat 2 can be avoided between compound eye, ensure image quality.Signal sealing coat 2 can be made by modes such as machine drilling, 3D printings, described signal sealing coat 2 is cylindric, its middle part has two axial through holes, convex lens in the multispectral imaging lens group 5 of through-hole aperture and double lens is in the same size or smaller, its spacing should match with compound eye, and the position of the respectively corresponding convex lens of each through hole arranges.Signal sealing coat 2 has certain thickness, and its thickness should be determined according to the focal length of convex lens.In general, the thickness of signal sealing coat 2 is less than or equal to the focal length of convex lens, and such as focal length of convex lens is 7mm, signal sealing coat is advisable between 5-6mm.
Described image processing system 4 is connected with imageing sensor 3, processes and merges for visible images and near infrared light image that imageing sensor 3 is inputted.Described display device is connected with image processing system, for visible images and near infrared light image after merging are carried out to output display.
Particularly, the processing of described image processing system 4 comprises two parts content:
1, vein extracts and strengthens: after the processing such as the near infrared light image (being black and white vein picture) that imageing sensor 3 is generated carries out size adjustment, intensity adjustment, direction normalization, denoising, filtering enhancing and veinprint is cut apart, refinement reparation and burr pruning, finally extract vein pattern.
2, the vein after extracting is fused on visible images (being colour picture) by image fusion technology.Specifically comprise: visible images is carried out to picture segmentation, make its size and position consistent with near infrared light image; The black and white vein nearly extracting in infrared light image changes blood vessel blueness into, carry out images match with visible images, be added to adaptively on colour picture after treatment, and the BORDER PROCESSING that superposes, finally reduce truly vein blood vessel scattergram, it is shown in real time on display simultaneously.
Manufacture method and the vein display system thereof of the multispectral imaging lens group of a kind of double lens provided by the invention, in the multispectral imaging lens group of this double lens, two camera lenses have light path separately, each camera lens can carry out optically focused to different light, one of them camera lens is for filtering near infrared light, to visible light-focusing; Another camera lens is for filtering to visible ray, near infrared light optically focused.In Polaroid, can obtain near-infrared image and visible images simultaneously.Because these two lens optical parameters are identical, imaging size and position are also basically identical.Therefore can easily the two be merged by image processing techniques, the enhancing that so both can realize body local vein shows, can realize on the whole again the display effect close with eye-observation, more be conducive to assist personnel and in the time carrying out venipuncture, find correspondence position.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (9)

1. a manufacture method for the multispectral imaging lens group of double lens, is characterized in that, comprising:
S1, get the transparent and surfacing of a slice sheet glass as substrate, sheet glass is cleaned to be placed in baking oven with clear water and acetone and toasts, remove steam and remaining acetone; After natural cooling, positive photoetching rubber is spun on sheet glass;
S2, the substrate of the good positive photoetching rubber of spin coating is toasted, remove the solvent in positive photoetching rubber; After having toasted, be placed in and under a mask plate, carry out uv-exposure; Wherein, the middle part of described mask plate has 2 lighttight border circular areas, and the remainder of mask plate is transparent;
S3, the substrate after good exposure is placed in to developer solution develops; Dissolve and remove the positive photoetching rubber part of exposing, the part being covered by the light tight border circular areas of mask plate in S2 leaves two cylindrical patterns;
In S4, substrate after development, plate the lighttight chromium film of one deck;
S5, substrate is placed in to acetone, two cylindrical patterns are dissolved in acetone, make to be plated in two chromium films on cylindrical pattern and be also stripped from removal simultaneously, expose the circular hole of two printing opacities;
S6, positive photoetching rubber is spun on to S5 processes in the substrate of post-drying, again after overbaking, under another mask plate, carry out uv-exposure by being placed in the substrate of positive photoetching rubber; Described another mask plate middle part has the border circular areas of 1 printing opacity, and the remainder of another mask plate is lighttight;
After S7, exposure are good, substrate is placed in to special developer solution and develops, the positive photoetching rubber through the circular hole place of overexposure is wherein dissolved and removed;
S8, nearly infrared cut-off light filtering films layer is coated on the circular hole place described in S7;
S9, repetition S6 to S7, expose to another circular hole, and remove positive photoetching rubber by developing solution dissolution; Then near infrared filter rete is coated on to another circular hole place;
S10, make two lens respectively, lens aperture size is identical with two circular hole sizes; By gummed, two lens are bonded in above-mentioned substrate, align with above-mentioned two circular holes in the position of lens.
2. manufacture method according to claim 1, is characterized in that, in S1, on sheet glass, the method for spin coating positive photoetching rubber is first with the speed spin coating of 500 revs/min 10 seconds, then with the speed spin coating of 2500 revs/min 30 seconds.
3. manufacture method according to claim 1, is characterized in that, in S1, the thickness of the positive photoetching rubber of spin coating is similar to 10 microns.
4. manufacture method according to claim 1, is characterized in that, in S2, the time of exposure of uv-exposure is 25 seconds, and exposure intensity is 20mW/cm 2.
5. manufacture method according to claim 1, is characterized in that, is 850nm arrowband near infrared filter rete at the rete of infrared filtering described in S9.
6. manufacture method according to claim 1, is characterized in that, in S10, described lens are convex lens.
7. a vein display system, is characterized in that, comprises the multispectral imaging lens group of double lens that adopts the arbitrary described method of claim 1 to 6 to make, and also comprises light source assembly, imageing sensor, image processing system and display device;
Described light source assembly is around being arranged at around the multispectral imaging lens group of double lens, and the light-emitting area of light source assembly is towards the plane of light incidence of the multispectral imaging lens group of double lens.
8. vein display system according to claim 7, it is characterized in that, described light source assembly comprises visible light source and near infrared light light source, described visible light source and near infrared light light source are fixed on a base, described base in the form of a ring, the light-emitting area of described visible light source and near infrared light light source is coniform and is arranged on base, and described visible light source and near infrared light light source are LED lamp, and the centre wavelength of near-infrared light source is 850nm.
9. vein display system according to claim 7, is characterized in that, between the beam projecting face of the multispectral imaging lens group of double lens and imageing sensor, is also provided with signal sealing coat; Described signal sealing coat middle part has two through holes, and through-hole aperture is less than or equal to the lens in the multispectral imaging lens group of double lens, and the position of the corresponding lens of each through hole arranges; The thickness of signal sealing coat is less than or equal to the focal length of lens.
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CN106236016A (en) * 2016-08-18 2016-12-21 皖江新兴产业技术发展中心 A kind of in-situ projection method for vein displaying picture
WO2018006604A1 (en) * 2016-07-02 2018-01-11 深圳市前海康启源科技有限公司 Vein imaging device for improving image clarity
CN107690648A (en) * 2016-10-20 2018-02-13 深圳达闼科技控股有限公司 A kind of image preview method and device based on iris recognition
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