CN203038297U - Multispectral fingerprint identification sensor - Google Patents
Multispectral fingerprint identification sensor Download PDFInfo
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- CN203038297U CN203038297U CN 201220731794 CN201220731794U CN203038297U CN 203038297 U CN203038297 U CN 203038297U CN 201220731794 CN201220731794 CN 201220731794 CN 201220731794 U CN201220731794 U CN 201220731794U CN 203038297 U CN203038297 U CN 203038297U
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Abstract
The utility model discloses a multispectral fingerprint identification sensor comprising a multispectral light source, a light filter, a first reflection mirror, flat glass, a second reflection mirror, a double telecentric lens, an image sensor, a detection light source, a detection lens and a single chip microcomputer. The multispectral light source, the light filter, the first reflection mirror, the flat glass, the second reflection mirror, the double telecentric lens are orderly arranged at a front side of the image sensor. The image sensor is connected with the single chip microcomputer through a signal line. A front end of the second reflection mirror is provided with the detection lens. A front side of the detection lens is provided with the detection light source which is electrically connected with the single chip microcomputer. The detection light source emits special light, and an image is obtained through the detection lens and biological characteristics are identified. According to the multispectral fingerprint identification sensor, under the condition of a limited space, that a detection optical path and an imaging optical path do not respond to each other can be ensured, and the image with high contrast and high definition is obtained.
Description
Technical field
The utility model relates to a kind of sensor, is specifically related to a kind of multispectral fingerprint Identification sensor.
Background technology
Optical fingerprint sensor is made of led light source, sheet glass, lens and CCD/CMOS imager, and the place ahead of led light source is provided with sheet glass, and the place ahead of sheet glass is provided with lens, and lens connect the CCD/CMOS imager by signal wire.
The principle of work of optical fingerprint sensor is: led light source sends the light of specific wavelength, according to sheet glass, finger is placed on the center position of sheet glass, the led light source finger that evenly throws light on, owing to the different fingerprint image scioptics that produce of the light reflectivity at the convex-concave position of fingerprint ridge line and valley line arrive the CCD/CMOS imagers, form fingerprint image clearly.This fingerprint image is further sent into the follow-up signal disposal system, realizes fingerprint recognition.
This optical fingerprint sensor owing to adopt the mode of lens direct imaging, needs bigger imaging space, and miniaturization is very difficult.
And, on sheet glass, to inject if any ambient light, the data that can have influence on the image scioptics arrival CCD/CMOS imager that fingerprints are collected, make the efficient of fingerprint recognition reduce, cause the phenomenon that just can correctly identify by multipass usually occurring to point and take place.Its essence is exactly the interference that is subjected to ambient light easily.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of multispectral fingerprint Identification sensor, and it can remove extraneous light to the interference of imageing sensor, and high-quality imaging is provided, thereby promotes recognition efficiency.
For solving the problems of the technologies described above, the technical solution of the multispectral fingerprint Identification sensor of the utility model is:
Comprise multispectral light source, optical filter, first catoptron, sheet glass, second catoptron, two telecentric objective, imageing sensor, detecting light source, detecting lens, single-chip microcomputer, multispectral light source, optical filter, first catoptron, sheet glass, second catoptron, two telecentric objective are set in turn in the front side of imageing sensor; Imageing sensor connects single-chip microcomputer by signal wire; Described multispectral light source and optical filter quantitatively mate one to one, and multispectral light source is positioned at imageing sensor front side peripheral position; The front side of second catoptron is provided with the detecting lens, and the front side of detecting lens is provided with the detecting light source; The detecting light source is electrically connected single-chip microcomputer; Detecting light source emission particular light ray is obtained the image discriminating biological characteristic through the detecting lens; Change when imageing sensor collects image information, start the detecting light source by single-chip microcomputer, the detecting light source forms a branch of strip light source by the detecting lens, shoots out through second catoptron; Imageing sensor is gathered the image in the detected light source beam scope, and image information is transferred to single-chip microcomputer; Single-chip microcomputer carries out analyzing and processing to image information, if image information meets biological characteristic, start multispectral light source by single-chip microcomputer, multispectral light source mating plate after filtration filters out veiling glare, successively by first catoptron, sheet glass, second catoptron, two telecentric objective, image in imageing sensor then; Imageing sensor obtains the multispectral light source irradiation image storage down of diverse location, carries out image and synthesizes, and obtains more images information and distinguishes biological characteristic.
The effective focal length of described pair of telecentric objective is 15mm～30mm, full visual field distorts relatively＜and 1%.
The modulation transfer function mtf value of described imageing sensor is: low frequency 90 lines are right/during millimeter, MTF＞0.5, and high frequency 120 lines are right/MTF＞0.3 during millimeter.
Described multispectral light source adopts, and led light sources red, blue, green three kinds of wavelength light are formed.
Described specific wavelength light obtains after being filtered by optical filter.
Described led light source intensity need not to block extraneous veiling glare during with the assurance Image Acquisition greater than external light source intensity, makes the image that collects not be subjected to the influence of ambient light photograph.
The technique effect that the utility model can reach is:
The utility model can guarantee to detect light path and imaging optical path does not respond mutually under the limited condition in space, thereby obtains to have good height contrast, the image of high definition.
The image of precision such as the utility model can obtain, accuracy of identification is favourable for improving.
The utility model can obtain extraordinary image quality, and can realize producing in batches.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
Fig. 1 is the synoptic diagram of the multispectral fingerprint Identification sensor of the utility model.
Description of reference numerals among the figure:
1 is sheet glass, and 2 is lighting device,
3 is imaging device, and 4 is cmos imager.
Embodiment
As shown in Figure 1, the multispectral fingerprint Identification sensor of the utility model, comprise multispectral light source, optical filter, first catoptron 1, sheet glass, second catoptron 2, two telecentric objective, imageing sensor 3, detecting light source, detecting lens, single-chip microcomputer 4, multispectral light source, optical filter, first catoptron 1, sheet glass, second catoptron 2, two telecentric objective are set in turn in the front side of imageing sensor 3; Imageing sensor 3 connects single-chip microcomputer 4 by signal wire; Described multispectral light source and optical filter quantitatively mate one to one, and multispectral light source is positioned at the front side peripheral position of imageing sensor 3;
Multispectral light source adopts, and led light sources red, blue, green three kinds of wavelength light are formed.
The front side of second catoptron 2 is provided with the detecting lens, and the front side of detecting lens is provided with the detecting light source; The detecting light source is electrically connected single-chip microcomputer 4; Detecting light source emission particular light ray is obtained the image discriminating biological characteristic through the detecting lens;
Change when imageing sensor 3 collects image information, start the detecting light source by single-chip microcomputer 4, the detecting light source forms a branch of strip light source by the detecting lens, shoots out through second catoptron 2; Imageing sensor 3 is gathered the image in the detected light source beam scope, and image information is transferred to single-chip microcomputer 4; 4 pairs of image informations of single-chip microcomputer are carried out analyzing and processing, if image information meets biological characteristic, start multispectral light source by single-chip microcomputer 4, multispectral light source mating plate after filtration filters out veiling glare, successively by first catoptron 1, sheet glass, second catoptron 2, two telecentric objective, image in imageing sensor 3 then; The multispectral light source irradiation that imageing sensor 3 obtains diverse location down image and store, imageing sensor 3 to single-chip microcomputer 4, carries out image signal transmission image by single-chip microcomputer 4 and synthesizes.
Multispectral recognition system need not when obtaining image to block extraneous veiling glare, because having image synthesis program in the single-chip microcomputer 4, the clear position of multiple image can be carried out picture and synthesize, and this has just guaranteed that the image that collects can not be subjected to the influence of ambient light photograph.
The modulation transfer function mtf value of imageing sensor 3 is: low frequency 90 lines are right/during millimeter, MTF＞0.5, and high frequency 120 lines are right/MTF＞0.3 during millimeter;
For realizing low distortion optical imagery, the design that imageing sensor 3 of the present utility model adopts based on two hearts far away (telecentric) object lens; The advantage of of the present utility model pair of telecentric beam path is that the inclination object plane causes the trapezoidal distortion of projection distortion to be overcome, and foursquare thing is rectangular image through optical system imaging, though the multiplying power difference of length and width direction can be easy to obtain high-precision correction; The multiplying power influence that the simultaneity factor out of focus causes is very little, and the measuring accuracy of system can be very high.
For reduced volume, preceding group is the light path of taking the photograph system far away, and preceding group of negative group of being made of with a slice lens just organizing of constituting of three lens formed, and the back group is three two groups double gauss structure.
The main balance ratio chromatism, of just group and distortion before of the present utility model in the group, the secondary effect of organize shortening tube length and balance coma, astigmatism, the curvature of field.
Transport function of the present utility model reaches more than 0. 3 when 120lp/mm.
After imageing sensor 3 entered duty, system did not know currently whether have finger need gather fingerprint, therefore can not start single-chip microcomputer 4 and gather images, otherwise the image that can lead to errors entered the follow-up signal disposal system and produced system mistake; The utility model adopts the light of specific wavelength to determine whether that finger exists.
Principle of work of the present utility model is as follows:
System is under waiting status, and the led light source of multispectral light source sends the light of specific wavelength, the light around single-chip microcomputer 4 detects; When finger is pinned sheet glass, finger around can blocking light and reflect the light of the specific wavelength that led light source sends; Therefore, there is finger to pin sheet glass as long as single-chip microcomputer 4 when detecting the light of this wavelength, just shows, need enters the fingerprint collecting flow process;
Light source is when irradiation, reflected light with multi-angle is gathered fingerprint, after multiple image is gathered, handled image is synthetic by unit again, like this with regard to solved extraneous light when the fingerprint collecting to gathering fingerprint light uneven unconspicuous problem that makes that the fingerprint recognition rate is not high of fingerprint that causes on imageing sensor.Namely no matter how extraneous light disturbs, locate to obtain a fingerprint clearly after the synthetic schistosity of single-chip microcomputer 4 images, increase fingerprint recognition efficient.
Claims (5)
1. multispectral fingerprint Identification sensor, it is characterized in that: comprise multispectral light source, optical filter, first catoptron, sheet glass, second catoptron, two telecentric objective, imageing sensor, detecting light source, detecting lens, single-chip microcomputer, multispectral light source, optical filter, first catoptron, sheet glass, second catoptron, two telecentric objective are set in turn in the front side of imageing sensor; Imageing sensor connects single-chip microcomputer by signal wire; Described multispectral light source and optical filter quantitatively mate one to one, and multispectral light source is positioned at imageing sensor front side peripheral position;
The front side of second catoptron is provided with the detecting lens, and the front side of detecting lens is provided with the detecting light source; The detecting light source is electrically connected single-chip microcomputer; Detecting light source emission particular light ray is obtained the image discriminating biological characteristic through the detecting lens;
Change when imageing sensor collects image information, start the detecting light source by single-chip microcomputer, the detecting light source forms a branch of strip light source by the detecting lens, shoots out through second catoptron; Imageing sensor is gathered the image in the detected light source beam scope, and image information is transferred to single-chip microcomputer; Single-chip microcomputer carries out analyzing and processing to image information, if image information meets biological characteristic, start multispectral light source by single-chip microcomputer, multispectral light source mating plate after filtration filters out veiling glare, successively by first catoptron, sheet glass, second catoptron, two telecentric objective, image in imageing sensor then; Imageing sensor obtains the multispectral light source irradiation image storage down of diverse location, carries out image and synthesizes, and obtains more images information and distinguishes biological characteristic.
2. multispectral fingerprint Identification sensor according to claim 1, it is characterized in that: the effective focal length of described pair of telecentric objective is 15mm～30mm, full visual field distorts relatively＜and 1%.
3. multispectral fingerprint Identification sensor according to claim 1, it is characterized in that: the modulation transfer function mtf value of described imageing sensor is: low frequency 90 lines are right/during millimeter, MTF＞0.5, high frequency 120 lines are right/MTF＞0.3 during millimeter.
4. multispectral fingerprint Identification sensor according to claim 1 is characterized in that: the led light sources composition of described multispectral light source employing redness, blue, green three kinds of wavelength light.
5. multispectral fingerprint Identification sensor according to claim 4 is characterized in that: described specific wavelength light obtains after being filtered by optical filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220731794 CN203038297U (en) | 2012-12-07 | 2012-12-27 | Multispectral fingerprint identification sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210521338 | 2012-12-07 | ||
| CN201210521338.2 | 2012-12-07 | ||
| CN 201220731794 CN203038297U (en) | 2012-12-07 | 2012-12-27 | Multispectral fingerprint identification sensor |
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| CN203038297U true CN203038297U (en) | 2013-07-03 |
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| CN 201220731794 Withdrawn - After Issue CN203038297U (en) | 2012-12-07 | 2012-12-27 | Multispectral fingerprint identification sensor |
| CN201210577142.5A Expired - Fee Related CN102982324B (en) | 2012-12-07 | 2012-12-27 | Multispectral sensor for fingerprint identification |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210577142.5A Expired - Fee Related CN102982324B (en) | 2012-12-07 | 2012-12-27 | Multispectral sensor for fingerprint identification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102982324A (en) * | 2012-12-07 | 2013-03-20 | 浙江凯拓机电有限公司 | Multispectral sensor for fingerprint identification |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103793689B (en) * | 2014-01-27 | 2017-06-06 | 南昌欧菲光科技有限公司 | The preparation method of fingerprint Identification sensor encapsulating structure, electronic equipment and fingerprint Identification sensor |
| TWI534717B (en) * | 2014-05-30 | 2016-05-21 | 正崴精密工業股份有限公司 | Fingerprint sensor |
| CN104077586B (en) * | 2014-06-20 | 2017-12-12 | 深圳百佳安生物识别技术有限公司 | The real-time keystone distortion correction method and its system of optical fingerprint sensor |
| DE102018101625A1 (en) * | 2018-01-25 | 2019-07-25 | JENETRIC GmbH | Device for optical direct recording of skin impressions and documents |
| CN109791612B (en) * | 2018-12-26 | 2023-08-08 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101493884B (en) * | 2008-01-24 | 2012-05-23 | 中国科学院自动化研究所 | Multi-optical spectrum image collecting device and method |
| CN101483524A (en) * | 2009-02-25 | 2009-07-15 | 李苏 | Distributed finger print recognition system for network and implementing method thereof |
| CN101889866B (en) * | 2010-07-30 | 2012-02-08 | 西安理工大学 | Palm bioelectrical impedance spectrum measuring device for biological characteristic recognition |
| WO2012031568A1 (en) * | 2010-09-10 | 2012-03-15 | Li Long | Physical and mental health care system and method thereof |
| CN203038297U (en) * | 2012-12-07 | 2013-07-03 | 浙江凯拓机电有限公司 | Multispectral fingerprint identification sensor |
-
2012
- 2012-12-27 CN CN 201220731794 patent/CN203038297U/en not_active Withdrawn - After Issue
- 2012-12-27 CN CN201210577142.5A patent/CN102982324B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102982324A (en) * | 2012-12-07 | 2013-03-20 | 浙江凯拓机电有限公司 | Multispectral sensor for fingerprint identification |
| CN102982324B (en) * | 2012-12-07 | 2015-11-18 | 浙江凯拓机电有限公司 | Multispectral sensor for fingerprint identification |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102982324B (en) | 2015-11-18 |
| CN102982324A (en) | 2013-03-20 |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130703 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |