CN106203407A - One has environment resistant light interference triangular prism and fingerprint collecting equipment - Google Patents
One has environment resistant light interference triangular prism and fingerprint collecting equipment Download PDFInfo
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- CN106203407A CN106203407A CN201610768820.4A CN201610768820A CN106203407A CN 106203407 A CN106203407 A CN 106203407A CN 201610768820 A CN201610768820 A CN 201610768820A CN 106203407 A CN106203407 A CN 106203407A
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- face
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- triangular prism
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The open one of the present invention has environment resistant light interference triangular prism, it it is the improvement of Collection prism to existing optical fingerprint collecting device, simultaneously, invention further provides the fingerprint collecting equipment containing this triangular prism, triangular prism body includes fingerprint collecting face, extinction face, exit facet, incidence surface；Fingerprint collecting face is 55 degree with the angle of extinction face composition, and fingerprint collecting face is 60 degree with the angle of exit facet composition；Incidence surface and extinction face angle are 50 degree, and distance gathers face 12mm；Fingerprint collecting face is finger placement location, and extinction face scribbles black matt paint.Solve conventional fingerprint collecting device easily by ambient light interference, thus cause fingerprint image that comparison is declined, reduce the inferior position problems such as fingerprint image quality.
Description
Technical field
The open one of the present invention has environment resistant light interference triangular prism, is to adopt existing optical fingerprint collecting device
The improvement of collection prism, meanwhile, invention further provides the fingerprint collecting equipment containing this triangular prism, belongs to living body finger print
Harvester technical field.
Background technology
At present, domestic and international market exists multiple optical profile type list and refer to fingerprint collecting and comparison equipment.Such fingerprint collecting sets
Standby design principle the most all utilizes optical total-reflection principle to be designed, i.e. light is transmitted to optically thinner medium by optically denser medium, when
When light and two dielectric interface normal angles are more than the cirtical angle of total reflection, i.e. angle of incidence ＞ arcsin(n1/n2), light is at light
Close medium occurs full transmitting.
For traditional optical full reflection fingerprint collecting device, substantially it is divided into bright background, two kinds of designs of dark background, its
In, bright background designs scheme fingerprint collecting equipment, light source the light sent becomes real by imaging lens after prism is totally reflected
Picture, is received by CCD.When fingerprint is restrained and gathered face in prism, fingerprint ridge is destroyed the light total reflection condition in this face, is formed light and shade phase
Between fingerprint image；Dark background design fingerprint collecting equipment, when fingerprint is restrained and gathered face in prism, lighting source sends
Light, the position contacted in collection face in fingerprint ridge scatters, and imaging lens receives from the scattered light of fingerprint ridge, and formation refers to
Print image.But this two schemes collecting device, the most all exist easily by ambient light interference, thus cause fingerprint image to comparison
Decline, reduce the inferior positions such as fingerprint image quality.See shown in Fig. 1, Fig. 2, be embodied in:
From collecting device external ambient light, by above two path, all can incide CCD receptor surface, thus interference comes
From the fingerprint imaging light of lighting source, causing fingerprint image dimmed, contrast declines, and have impact on fingerprint matter to a certain extent
Amount.Because air comprises the light of various wavelength, place the filter elements such as light filter in a device so using, it is impossible to fundamentally
Shielded the ambient light of device external, so, optical fingerprint harvester receives certain restriction in outdoor application.Right
This fingerprint capturer considering to invent the interference of a environment resistant light, is necessary.
Summary of the invention
The open one of the present invention has environment resistant light interference triangular prism and fingerprint collecting equipment, solves existing fingerprint and adopts
Collection equipment is easily by ambient light interference, thus causes fingerprint image to decline comparison, reduces the inferior position problems such as fingerprint image quality.
A kind of total-reflection type environment resistant light interference triangular prism of the present invention, it is characterised in that:
Triangular prism body includes fingerprint collecting face, extinction face, exit facet, incidence surface；Fingerprint collecting face and extinction face composition
Angle is 55 degree, and fingerprint collecting face is 60 degree with the angle of exit facet composition；Incidence surface and extinction face angle are 50 degree, and distance is adopted
Collection face 12mm；Fingerprint collecting face is finger placement location, and extinction face scribbles black matt paint.
The fingerprint collecting equipment that total-reflection type environment resistant light of the present invention interference triangular prism is made；Its feature exists
In: include total-reflection type environment resistant light interference triangular prism, red bright LED source, circuit main board, bonnet, sealing-plug, data
Line, camera module, end cap, housing, seal washer；Red bright LED source is fixed on total reflection as the illuminator of system
The lower section of formula environment resistant light interference triangular prism；Camera module is fixed on the right side of prism, and optical axis overlaps with prism centers；Shooting mould
Group is connected with circuit main board by FFC line, and circuit main board is connected by holding wire communication with the outside world.
The high index of refraction manufacturing material selection 1.67 of total-reflection type environment resistant light of the present invention interference triangular prism
Optical glass, its concrete environment resistant light implementation is as follows:
1. ambient light is incident below the normal in fingerprint collecting face outside prism, and after refraction by prism, transmitted ray is from prism
Right side exit face.Take the maximum Amax=90 degree of the angle of incidence A of ambient light, by law of refraction sinI1 /sinI2=n1/
N2, calculates B=41.17 °.The region that in figure, dash area is covered by ambient light, as being positioned over prism by image-forming objective lens 4
Above right side, transmitted ambient light overlay area, ambient light will be unable to inject objective lens surface, thus fingerprint image can not be produced shadow
Ring, reach the effect (seeing Fig. 4) of collecting device environment resistant light interference.
2. ambient light is incident above the normal of fingerprint collecting face outside prism, the refraction light after prism gathers face refraction
Extinction face got to by line, and refraction light is absorbed, and ambient light will be unable to inject objective lens surface, thus can not produce fingerprint image
Impact, reaches the effect (seeing Fig. 5) of collecting device environment resistant light interference.
3. fingerprint imaging principle is specifically, illumination surface light source is positioned over outside incidence surface, and incidence surface is carried out vertical irradiation.
Fingerprint collecting face, through incidence surface transmission, is illuminated by incident illumination, and incident illumination is scattered by restraining the fingerprint ridge in fingerprint collecting face,
Scattered light reflects through exit facet, and the light after refraction is imaged object lens and receives, and forms fingerprint real image, and real image is received by CCD7, on
Pass DSP process.Image-forming objective lens constitutes camera module with CCD7, sees Fig. 6.
Mainboard: be designed with DSP with cmos sensor to complete fingerprint image acquisition, it is possible to connected by USB free drive
On PC, PC is defaulted as video equipment.Cmos sensor aspect uses 2,000,000 element sensors, maximum output image resolution ratio
Up to 1600*1200.DSP application standard UV C agreement free drive is dynamic to be directly connected in USB interface, supports existing each popular operation system
The connection of system, it is simple to Client application and exploitation.
The present invention has the active effect that
Provide a kind of novel total-reflection type environment resistant light interference triangular prism, solve conventional fingerprint collecting device easily by ring
Border light interference, thus cause fingerprint image that comparison is declined, reduce the inferior position problems such as fingerprint image quality.It is on existing market
One upgrading of traditional optical profile type triangular prism design, promotes this series products capacity of resisting disturbance to ambient light, significantly
Expand the applied environment of optical fingerprint harvester.
Accompanying drawing explanation
Fig. 1 is that ambient light directly participates in image；
Fig. 2 is ambient light secondary reflecting imaging；
Fig. 3 is that total-reflection type environment resistant light of the present invention disturbs triangular prism structure schematic diagram；
Fig. 4 is for avoiding ambient light imaging schematic diagram；
Fig. 5 is for avoiding ambient light secondary imaging schematic diagram；
Fig. 6 is the optical imaging concept figure of fingerprint collecting equipment of the present invention；
Fig. 7 is fingerprint collecting unit construction principle figure of the present invention.
In figure, 1, red bright LED source；2, circuit main board；3, bonnet；4, sealing-plug；5, data wire；6, shooting mould
Group；7, end cap；8, housing；9, total-reflection type environment resistant light interference triangular prism；10, seal washer；9.1, fingerprint collecting face；
9.2, extinction face；9.3, exit facet；9.4, incidence surface.
Detailed description of the invention
Illustrated further the description present invention by following example, and limits the present invention never in any form, without departing substantially from
On the premise of the technical solution of the present invention, what those of ordinary skill in the art made for the present invention easily realized any changes
Within dynamic or change falls within scope of the presently claimed invention.
Embodiment 1
The preparation of total-reflection type environment resistant light interference triangular prism:
With reference to shown in Fig. 3, the body of total-reflection type environment resistant light interference triangular prism selects the optical glass having high refractive index of 1.67
Making, body includes fingerprint collecting face 9.1, extinction face 9.2, exit facet 9.3, incidence surface 9.4, wherein, fingerprint collecting face 9.1
Being 45 ° with the angle of extinction face 9.2 composition, fingerprint collecting face 9.1 is 50 ° with the angle of exit facet 9.3 composition；Incidence surface 9.4
Being 50 ° with extinction face 9.2 angle, it is 12mm that distance gathers face 9.1；Fingerprint collecting face 9.1 is finger placement location, extinction face
Black matt paint is scribbled on 9.2.
Embodiment 2
With reference to Fig. 3, the optical glass having high refractive index of 1.67 is selected to make the body of total-reflection type environment resistant light interference triangular prism,
Body includes fingerprint collecting face 9.1, extinction face 9.2, exit facet 9.3, incidence surface 9.4, wherein, fingerprint collecting face 9.1 and extinction
The angle of face 9.2 composition is 50 °, and fingerprint collecting face 9.1 is 55 ° with the angle of exit facet 9.3 composition；Incidence surface 9.4 and extinction
Face 9.2 angle is 55 °, and it is 16mm that distance gathers face 9.1；Fingerprint collecting face 9.1 is finger placement location, and extinction face 9.2 is coated with
There is black matt paint；Fingerprint collecting face 9.1 is finger placement location, and extinction face 9.2 scribbles black matt paint.
Embodiment 3
With reference to Fig. 3, the optical glass having high refractive index of 1.67 is selected to make the body of total-reflection type environment resistant light interference triangular prism,
Body includes fingerprint collecting face 9.1, extinction face 9.2, exit facet 9.3, incidence surface 9.4, wherein, fingerprint collecting face 9.1 and extinction
The angle of face 9.2 composition is 55 °, and fingerprint collecting face 9.1 is 60 ° with the angle of exit facet 9.3 composition；Incidence surface 9.4 and extinction
Face 9.2 angle is 60 °, and it is 18mm that distance gathers face 9.1；Fingerprint collecting face 9.1 is finger placement location, and extinction face 9.2 is coated with
There is black matt paint；Fingerprint collecting face 9.1 is finger placement location, and extinction face 9.2 scribbles black matt paint.
Embodiment 4
Fingerprint collecting equipment composition with reference to Fig. 7, the present invention by 1, red bright LED source；2, circuit main board；
3, bonnet；4, sealing-plug；5, data wire；6, camera module；7, end cap；8, housing；9, total-reflection type resists
Ambient light interference triangular prism；10, seal washer；Structural relation: the front lower portion of housing 8 is provided with total-reflection type and resists
Ambient light interference triangular prism 9(selects embodiment 1 or embodiment 2, embodiment 3),
Wherein, red bright LED source 1 is fixed on total-reflection type environment resistant light interference triangular prism as the illuminator of system
The lower section of 9；Camera module 6 is fixed on the right side of total-reflection type environment resistant light interference triangular prism 9, optical axis and total-reflection type environment resistant
The center superposition of light interference triangular prism 9；Camera module 6 is connected with circuit main board 2 by FFC line, and circuit main board 2 passes through data
Line 5 communication with the outside world connects.
After fingerprint collecting device is connected with computer by USB data line, green bright LED source 1 lights, and represents light source
The most normally work；Being restrained on fingerprint collecting face 9.1 by finger, fingerprint signal enters cmos sensor through light path, at electricity
On road mainboard 2, first DSP main control chip is configured, make it carry out USB free drive equipment mode；Then DSP main control chip leads to
Cross I2C interface SENSOR depositor is configured, including to acquisition window size, acquisition window starting point, time of exposure, gain
Etc. the setting of information, setting completed, and SENSOR starts working；The signal provided by SENSOR is by defeated for the view data of SENSOR
Entering and cache in the FIFO of DSP, view data is transferred to host computer by USB, through host computer by recycling UCV agreement
The relevant treatment such as the adjustment of software show complete fingerprint image.
Embodiment 4
Detection test
By the checking to embodiment 1 embodiment 2 embodiment 3, solve conventional fingerprint collecting device easily by ambient light interference,
Thus cause fingerprint image that comparison is declined, reduce the inferior position problems such as fingerprint image quality.
Tradition total reflection prism make fingerprint collecting device 10Klux ambient light irradiate under gather fingerprint image part Fig. 8:
In figure, fingerprint ridge, paddy contrast decline, and fingerprint image obscures.
Environment resistant light of the present invention interference total reflection prism makes what fingerprint collecting device gathered under 10Klux ambient light is irradiated
Fingerprint image is as it is shown in figure 9, in figure, fingerprint ridge, paddy contrast are high, and fingerprint image is clear.
Conclusion: the environment resistant light interference total reflection prism that the present invention provides is made fingerprint collecting device and solved conventional fingerprint and adopt
Collection equipment is easily by ambient light interference, thus causes fingerprint image to decline comparison, reduces the inferior position problems such as fingerprint image quality.
Claims (2)
1. a total-reflection type environment resistant light interference triangular prism, it is characterised in that:
Triangular prism body includes fingerprint collecting face, extinction face, exit facet, incidence surface；Fingerprint collecting face and extinction face composition
Angle is 50 ~ 60 degree, and fingerprint collecting face is 55 ~ 60 degree with the angle of exit facet composition；Incidence surface and extinction face angle are 50 degree,
Distance gathers face 12mm；Fingerprint collecting face is finger placement location, and extinction face scribbles black matt paint.
2. the fingerprint collecting equipment being made up of the total-reflection type environment resistant light interference triangular prism described in claim 1, its feature
It is: include total-reflection type environment resistant light interference triangular prism, red bright LED source, circuit main board, bonnet, sealing-plug, number
According to line, camera module, end cap, housing, seal washer；Red bright LED source is fixed on as the illuminator of system and is all-trans
Penetrate the lower section of formula environment resistant light interference triangular prism；Camera module is fixed on the right side of prism, and optical axis overlaps with prism centers；Shooting
Module is connected with circuit main board by FFC line, and circuit main board is connected by holding wire communication with the outside world.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610768820.4A CN106203407A (en) | 2016-08-31 | 2016-08-31 | One has environment resistant light interference triangular prism and fingerprint collecting equipment |
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|---|---|---|---|
| CN201610768820.4A CN106203407A (en) | 2016-08-31 | 2016-08-31 | One has environment resistant light interference triangular prism and fingerprint collecting equipment |
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| CN106203407A true CN106203407A (en) | 2016-12-07 |
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| CN201610768820.4A Pending CN106203407A (en) | 2016-08-31 | 2016-08-31 | One has environment resistant light interference triangular prism and fingerprint collecting equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107392160A (en) * | 2017-07-27 | 2017-11-24 | 北京小米移动软件有限公司 | Optical finger print recognition methods and device, computer-readable recording medium |
| CN108256399A (en) * | 2016-12-28 | 2018-07-06 | 上海箩箕技术有限公司 | Fingerprint imaging module and electronic equipment |
| CN109711255A (en) * | 2018-11-26 | 2019-05-03 | Oppo广东移动通信有限公司 | Fingerprint acquisition method and related device |
| CN111357010A (en) * | 2019-06-28 | 2020-06-30 | 深圳市汇顶科技股份有限公司 | A enhancement film for optical fingerprint sensor under screen |
| CN111753806A (en) * | 2020-07-09 | 2020-10-09 | 盛视科技股份有限公司 | An integrated device for multi-finger fingerprint collection and OCR collection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108256399A (en) * | 2016-12-28 | 2018-07-06 | 上海箩箕技术有限公司 | Fingerprint imaging module and electronic equipment |
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| CN111357010A (en) * | 2019-06-28 | 2020-06-30 | 深圳市汇顶科技股份有限公司 | A enhancement film for optical fingerprint sensor under screen |
| CN111357010B (en) * | 2019-06-28 | 2023-09-22 | 深圳市汇顶科技股份有限公司 | Reinforcement film for under-screen optical fingerprint sensor |
| CN111753806A (en) * | 2020-07-09 | 2020-10-09 | 盛视科技股份有限公司 | An integrated device for multi-finger fingerprint collection and OCR collection |
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Application publication date: 20161207 |