CN106454049B - Iris discernment and two unification modules of making a video recording of shooing based on partition bi-pass filter - Google Patents
Iris discernment and two unification modules of making a video recording of shooing based on partition bi-pass filter Download PDFInfo
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- CN106454049B CN106454049B CN201610962753.XA CN201610962753A CN106454049B CN 106454049 B CN106454049 B CN 106454049B CN 201610962753 A CN201610962753 A CN 201610962753A CN 106454049 B CN106454049 B CN 106454049B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/18—Eye characteristics, e.g. of the iris
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- Ophthalmology & Optometry (AREA)
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- General Physics & Mathematics (AREA)
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Abstract
The utility model provides an iris discernment and two unification modules of making a video recording based on subregion bi-pass filter, in the middle of the module of making a video recording camera lens clear aperture and sensitization imaging chip, set up the filter that can pass through visible light (infrared light cut) and infrared light (visible light cut) respectively, make the light that receives on the sensitization imaging chip divide into visible light region and infrared light region to realize the iris discernment and the module of making a video recording of two unifications of function of shooing. The filter is formed by splicing a visible light passing (infrared light cut-off) filter and an infrared light passing (visible light cut-off) filter to form a regional double-channel filter, and the spliced part is treated to prevent light leakage.
Description
Technical Field
The invention relates to the technical field of camera modules, in particular to a filter which is formed by splicing a visible light passing (infrared light cut-off) filter and an infrared light passing (visible light cut-off) filter to form two channels in different areas.
Background
The natural light is composed of visible light and infrared light, and the visible light and the infrared light are respectively positioned in different wave bands. The iris identification is that infrared light is reflected by the iris of the pupil, the reflected infrared light is captured by the camera to form a picture containing iris texture details, and if visible light exists when the infrared light is captured by the camera, the visible light can weaken the iris texture details, so that the identification requirement cannot be met. The iris identification module needs to be provided with a filter for cutting off visible light and passing infrared light to process light. The common photographing is to capture visible light reflected by scenery and human images through a camera to form a picture, and infrared light can make the picture red, so that a picture with normal color cannot be obtained. The common photographing module needs to be provided with an optical filter for infrared light cut-off and visible light to pass through so as to process light.
The current mode capable of simultaneously realizing iris recognition and photographing functions is as follows: the shooting module is additionally provided with a miniature optical filter switching device, and the switching device stretches out the infrared light cut-off visible light filter and retracts the infrared light to pass through the visible light cut-off filter for shooting during shooting; during iris recognition, the infrared light is stretched out and passes through the visible light cut-off filter, and the infrared light cut-off visible light is retracted and passes through the filter to acquire an iris image. The image pickup switching structure is shown in fig. 1. There is a camera module for photographing and iris recognition (patent No. CN 201520984989.4). Fig. 2 is a schematic structural diagram of the camera module of the patent.
The iris identification and photographing composite camera module with the optical filter switching mechanism is not beneficial to the thinning and miniaturization design of a mobile phone because the optical filter switching mechanism is added, and the size and the thickness of the module are greatly increased. In addition, due to the addition of the micro-filter switching mechanism, the solution has poor durability and reliability, so that no mobile phone uses the solution so far.
Disclosure of Invention
Aiming at the problems in the prior art, the applicant provides an iris recognition and photographing two-in-one camera module based on a partition bi-pass filter. According to the invention, the infrared light of the common photographing and shooting module is partitioned by the optical filter, so that the infrared light is formed into the optical filter through which the visible light and the infrared light are partitioned, so that one common shooting module has photographing and iris image acquisition functions at the same time, the volume of the shooting module is not changed, and the durability and reliability of the module are not weakened.
The technical scheme of the invention is as follows:
the iris recognition and photographing two-in-one camera module based on the partition bi-pass filter is characterized in that a filter in the camera module is formed by splicing a visible light cut-off filter and an infrared light cut-off filter.
The infrared light cut-off filter is white glass, blue glass or blue spray glass; the half wavelength is 650 +/-10 nm, and the wavelength band of the main imaging light is between 360 and 650 nm; after 650nm, the light transmittance is gradually halved to reach 0 near 710 nm.
The visible light cut-off filter can pass light with the wavelength of 810-920 nm.
The splicing mode of the visible light cut-off filter and the infrared light cut-off filter comprises glue bonding, laser welding and ultrasonic welding, or a complete piece of glass is coated with films in a partition mode, and the visible light filtering film and the infrared light filtering film are respectively sprayed to achieve the splicing effect.
And a shading substance is coated at the splicing part of the visible light cut-off filter and the infrared light cut-off filter to prevent glare and ghost. The light shading substance can be light-tight glue.
The areas of the visible light cut-off filter and the infrared light cut-off filter are not smaller than the area of an imaging area of the photosensitive chip of the camera module, and the area ratio of the two filters is adjusted according to actual needs.
The camera lens of the camera module is sequentially provided with 3-6 polishing lenses and a part of spherical plastic lens from a lens light through hole; the part of the spherical plastic lens corresponding to the visible light cut-off filter is a spherical surface, and the focus of the spherical surface is positioned on the surface of the visible light cut-off filter; the part of the spherical plastic lens corresponding to the infrared light cut-off filter is an aspheric surface; external light passes through the light through holes and is finally focused on the imaging chip to form an image through refraction corresponding to the number of the lenses.
The beneficial technical effects of the invention are as follows:
the invention sets filter plates which can respectively pass visible light (infrared light cut-off) and infrared light (visible light cut-off) between the lens light-passing hole of the camera module and the photosensitive imaging chip, so that the light received by the photosensitive imaging chip is divided into a visible light region and an infrared light region, thereby realizing the camera module with two functions of iris recognition and photographing.
Aiming at the scheme with the micro-filter switching mechanism in the prior art, the invention can realize that the infrared recognition function and the photographing function are integrated into one camera module, simultaneously, the size of the camera module is as small as possible, the thickness is as thin as possible, the reliability and the reliability are higher, the camera module can be placed at the position of a front camera of a mobile phone, the redesign of the internal structure of the mobile phone is not needed, and the thinning and the miniaturization of the mobile phone are easy to realize.
For the front cameras with different specifications, the iris recognition and photographing 2-in-1 functions can be realized only by replacing the internal optical filter with the partitioned visible light and infrared light double-pass optical filter, and the compatibility is high and flexible.
Drawings
FIG. 1 is a diagram of a camera module structure capable of simultaneously realizing iris recognition and photographing functions in the prior art;
fig. 2 is a schematic structural diagram of a camera module of patent CN 201520984989.4;
FIG. 3 is a schematic diagram of a filter structure formed by splicing a visible light cut-off filter and an infrared light cut-off filter according to the present invention;
FIG. 4 is a schematic view of an imaging mode of the camera module according to the present invention;
FIG. 5 is a schematic view of a micro lens structure;
FIG. 6 is a schematic diagram of the transmission wavelength of an infrared light cut-off filter used in the present invention;
FIG. 7 is a schematic diagram of the transmission wavelength of the visible light cut-off filter used in the present invention.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 3, the iris recognition and photographing two-in-one camera module based on the partitioned two-pass filter according to the present invention is formed by splicing a visible light cut-off filter 2 (transmitting infrared light) and an infrared light cut-off filter 3 (transmitting visible light) at a position where the camera module is mounted with a filter 1.
Wherein the visible light cut-off filter 2 can pass light with wavelength of 810-920nm, as shown in FIG. 6. The infrared light cut-off filter 3 is white glass, Blue glass or Blue coating glass; the half wavelength is 650 +/-10 nm, and the wavelength band of the main imaging light is between 360 and 650 nm; the light transmittance after 650nm was halved stepwise to reach 0 around 710nm, as shown in FIG. 5. The thicknesses of the visible light cut-off filter 2 and the infrared light cut-off filter 3 are both 0.2-0.22 mm.
The areas of the visible light cut-off filter 2 and the infrared light cut-off filter 3 are not smaller than the area of an imaging area of the photosensitive chip of the camera module, and the area ratio of the two filters is adjusted according to actual needs.
The visible light cut-off filter 2 and the infrared light cut-off filter 3 can be spliced in various ways, such as glue bonding, laser welding and ultrasonic welding, or a complete piece of glass is coated with a film in a partition mode, and a visible light filtering film and an infrared light filtering film are respectively sprayed to achieve the splicing effect, and the like.
In order to prevent the phenomena of ghost and glare caused by light leakage at the joint position, opaque glue or other light-shielding substances can be coated at the splicing gap 4.
When the camera module provided by the invention works, as shown in fig. 4, natural light (visible light and infrared light) reflected by scenery and human images enters the camera module through the lens light-transmitting hole 5, when light is refracted by the lens and passes through the partition optical filter, part of infrared light to be photographed is filtered, and only visible light passes through, so that a photo image is formed on the corresponding imaging chip. Part of visible light needing iris recognition is filtered, and an iris image is formed on a corresponding imaging chip area only through infrared light reflected by the iris.
In the invention, under the complete image, the infrared light filtering area is a normal photographing area, and the visible light filtering area forms red. Two different imaging requirements are simultaneously met on the same photosensitive area through the double-pass filter, the formed image is output to an application end for intercepting and selecting, the iris area image is used for iris recognition, and the photographed area image is used for forming a photo.
In order to further correct the uniformity and brightness of the light rays entering the visible light cut-off filter 2 and the infrared light cut-off filter 3, 3 to 6 polishing lenses 6 and a part of spherical plastic lens 7 are sequentially arranged on the lens of the camera module from the lens light through hole 5, and the external light rays pass through the light through hole 5 and are finally focused on the imaging chip to form an image through refraction corresponding to the number of the lenses, as shown in fig. 5. Wherein, the part of the spherical plastic lens 7 corresponding to the visible light cut-off filter 2 is a spherical surface 8, and the focus of the spherical surface 8 is positioned on the surface of the visible light cut-off filter 2; the portion corresponding to the infrared light cut filter 3 is aspherical.
Claims (7)
1. An iris identification and photographing two-in-one camera module based on a partition bi-pass filter is characterized in that the filter in the camera module is formed by splicing a visible light cut-off filter and an infrared light cut-off filter;
the camera lens of the camera module is sequentially provided with 3-6 polishing lenses and a part of spherical plastic lens from a lens light through hole; the part of the spherical plastic lens corresponding to the visible light cut-off filter is a spherical surface, and the focus of the spherical surface is positioned on the surface of the visible light cut-off filter; the part of the spherical plastic lens corresponding to the infrared light cut-off filter is an aspheric surface; external light passes through the light through holes and is finally focused on the imaging chip to form an image through refraction corresponding to the number of the lenses.
2. The camera module of claim 1, wherein the infrared cut-off filter is white glass, blue glass or blue spray glass; the half wavelength is 650 +/-10 nm, and the wavelength band of the main imaging light is between 360 and 650 nm; after 650nm, the light transmittance is gradually halved to reach 0 near 710 nm.
3. The camera module as claimed in claim 1, wherein the visible light cut-off filter has a light passing wavelength of 810-920 nm.
4. The camera module according to claim 1, wherein the visible light cut-off filter and the infrared light cut-off filter are spliced together by glue bonding, laser welding, ultrasonic welding, or by coating a film on a piece of complete glass in different areas, and respectively spraying a visible light filter film and an infrared light filter film to achieve the splicing effect.
5. The camera module of claim 1, wherein a light blocking material is coated at a splicing portion of the visible light cut-off filter and the infrared light cut-off filter to prevent glare and ghost.
6. The camera module of claim 5, wherein said light blocking substance is an opaque glue.
7. The camera module of claim 1, wherein the visible light cut-off filter and the infrared light cut-off filter have respective areas not smaller than the area of the imaging area of the photosensitive chip of the camera module, and the area ratio of the two filters is adjusted according to actual needs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610962753.XA CN106454049B (en) | 2016-10-28 | 2016-10-28 | Iris discernment and two unification modules of making a video recording of shooing based on partition bi-pass filter |
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| CN201610962753.XA CN106454049B (en) | 2016-10-28 | 2016-10-28 | Iris discernment and two unification modules of making a video recording of shooing based on partition bi-pass filter |
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| CN106773457A (en) * | 2016-12-22 | 2017-05-31 | 信利光电股份有限公司 | A kind of camera module of integrated iris and auto heterodyne camera function |
| CN106851078A (en) * | 2017-04-07 | 2017-06-13 | 信利光电股份有限公司 | A kind of filtering apparatus and camera module |
| CN107301392B (en) * | 2017-06-20 | 2020-12-04 | 华天科技（昆山）电子有限公司 | Wafer-level image acquisition device |
| CN108875472B (en) * | 2017-06-26 | 2021-08-24 | 北京旷视科技有限公司 | Image acquisition device and face identity verification method based on image acquisition device |
| CN107302650B (en) * | 2017-06-26 | 2020-06-19 | 信利光电股份有限公司 | Manufacturing method of base, camera module and electronic equipment |
| CN107172338B (en) * | 2017-06-30 | 2021-01-15 | 联想(北京)有限公司 | Camera and electronic equipment |
| CN107516066B (en) * | 2017-07-20 | 2021-03-09 | Oppo广东移动通信有限公司 | Detection method and related product |
| CN109508588A (en) * | 2017-09-15 | 2019-03-22 | 杭州海康威视数字技术股份有限公司 | Monitoring method, device, system, electronic equipment and computer readable storage medium |
| JP7173727B2 (en) * | 2017-10-16 | 2022-11-16 | 東京晨美光学電子株式会社 | imaging device |
| CN110231672B (en) * | 2018-02-28 | 2021-08-10 | 张家港康得新光电材料有限公司 | Preparation method and preparation system of optical filter module |
| CN111163244B (en) * | 2018-11-08 | 2022-02-22 | 宁波舜宇光电信息有限公司 | Camera module and application thereof |
| CN110245627B (en) * | 2019-06-19 | 2022-04-29 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN112188046B (en) * | 2019-07-05 | 2021-09-10 | 杭州海康威视数字技术股份有限公司 | Imaging assembly of camera, camera and filtering control method thereof |
| CN110955098B (en) * | 2020-02-25 | 2020-11-03 | 杭州美迪凯光电科技股份有限公司 | Camera switching module and manufacturing method thereof |
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| CN202975563U (en) * | 2012-06-20 | 2013-06-05 | 长春市佶达智能工程有限公司 | Motor straight-hit switching optical filter |
| KR20140098364A (en) * | 2013-01-31 | 2014-08-08 | 오형렬 | Iris authentication device with means to avoid reflections from glasses |
| CN203982054U (en) * | 2013-12-30 | 2014-12-03 | 浙江大华技术股份有限公司 | A kind of switch and image collecting device |
| CN104394306B (en) * | 2014-11-24 | 2018-02-27 | 北京中科虹霸科技有限公司 | Camera module and equipment for the multichannel multizone plated film of iris recognition |
| CN206559462U (en) * | 2016-10-28 | 2017-10-13 | 无锡豪帮高科股份有限公司 | A kind of iris recognition and two-in-one camera module of taking pictures based on subregion bilateral optical filter |
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