CN201233606Y - Fingerprint recognition optical system - Google Patents
Fingerprint recognition optical system Download PDFInfo
- Publication number
- CN201233606Y CN201233606Y CNU2008200444515U CN200820044451U CN201233606Y CN 201233606 Y CN201233606 Y CN 201233606Y CN U2008200444515 U CNU2008200444515 U CN U2008200444515U CN 200820044451 U CN200820044451 U CN 200820044451U CN 201233606 Y CN201233606 Y CN 201233606Y
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- fingerprint
- light
- fingerprint recognition
- prism
- optical system
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Abstract
The utility model provides a fingerprint recognition optical system, which comprises a prism (3), an optical imaging system and an illuminating system, wherein the prism (3) comprises a background surface (34), a fingerprint recognition surface (33), a total reflecting surface (32) and a light ray inward and outward interface (31); and the fingerprint recognition face (33) and the total reflecting surface (32) are planar, therefore, after a human fingerprint is pressed on the fingerprint recognition surface (33), the total reflection function of the fingerprint recognition surface (33) can be destroyed when the salient part of the fingerprint meet light rays; a secondary total reflection is carried out; and then the light rays go out from the light ray inward and outward interface; light rays can be totally reflected by the fingerprint recognition surface (33) and be reflected to the background surface (34), when the light rays meet the cupped part of the fingerprint; being matched with the background surface (34) which is painted to black, the fingerprint can be seen from the light ray inward and outward interface (31) that the salient part of the fingerprint is bright white, and the cupped part of the fingerprint is black, thereby achieving double-valued fingerprint image. The optical system has the advantages that the system is thinner, the volume is small, and fingerprint image is clear.
Description
1, technical field:
The utility model relates to a kind of fingerprint identifying optical system, relates in particular to the fingerprint image acquisition device.
2, background technology:
Fingerprint has uniqueness and unchangeability, and fingerprint identification technology is easy to use, safe and reliable.Fingerprint identifying optical system is the device that the input media of whole fingerprint recognition system is promptly gathered fingerprint, can be used in widely on the mouse, keyboard, handset device of Fingerprint Lock, attendance checking system, band fingerprint recognition, also can be used for the operations such as fingerprint comparison collection of public security system, for improving the sharpness of fingerprint recognition, usually adopt fingerprint identifying optical system (being optical fingerprint acquisition instrument), its light path has two kinds of total-reflection type and diffuse transmission types.
The following problem of existing fingerprint identifying optical system ubiquity: 1) the total system volume is big, and is thicker, and reason mainly is that the prism that adopts is bigger and thicker; 2) the structure more complicated of some prisms, because in the design its function as the lens of imaging is designed, for example the fingerprint recognition face of some prisms (being surface of contact) is arranged to cambered surface etc., and complicacy and difficulty of processing that these all can increase product structure also cause system's thickness and volume to increase; 3) cooperation on optical imaging system and the pcb board is compact inadequately, and the total system volume is big, and is thicker; 4) layout of illuminator is unreasonable, causes fingerprint recognition face uneven illumination even, color spot and not fogging problem such as clear occur, and causes the total system volume big, and is thicker.5) there is serious trapezoidal distortion in the imaging of conventional fingerprint instrument, causes discrimination to descend.
3, utility model content:
The utility model purpose is to overcome the deficiencies in the prior art and a kind of relatively thin, fingerprint identifying optical system that volume is little is provided.
The utility model is achieved by the following technical solution:
A kind of fingerprint identifying optical system, comprise prism, optical imaging system and illuminator, described prism comprises four function faces: background surfaces, the fingerprint recognition face, fully reflecting surface, light turnover interface, wherein the fingerprint recognition face is plane and relative with fully reflecting surface, background surfaces is relative with light turnover interface, illuminator arrives the fingerprint recognition face with irradiate light, people's fingerprint is by after being pressed in the fingerprint recognition face, carried out the secondary total reflection by fully reflecting surface again after total reflection function when light runs into the part of fingerprint protrusion on the fingerprint recognition face is destroyed, go out from light turnover interface then; Run into the part of fingerprint depression when light, total reflection and directive background surfaces take place in light on the fingerprint recognition face, background surfaces is coated with black, under the cooperation of background surfaces, pass in and out the interface from light, the part that fingerprint protrudes forms the white of light, and the part of fingerprint depression forms the binaryzation that black is realized fingerprint image.In addition, because the utility model has adopted prism to have two fully reflecting surfaces, utilize twice total reflection, the volume and the thickness of prism are all reduced, thereby reduced the volume of total system, in addition, prism relatively simple for structure, processing and manufacturing is easy, utilizes prism to realize that the binaryzation of fingerprint image makes things convenient for Computer Processing, accelerates its arithmetic speed.
Above-mentioned described background surfaces can be the set face that plane, curved surface, a plurality of face combine.The shape of the background surfaces after the blacking can be arbitrarily.
Above-mentioned described rear at prism also is provided with optical imaging system, this optical imaging system comprises catoptron, Guang Lan hole, imaging len, the fingerprint image of binaryzation through after the mirror reflects through imaging on the sensitive chip behind Guang Lan hole, the imaging len, simple in structure, rationally distributed, make the total system volume little, compact, effectively eliminate imaging and have serious trapezoidal distortion problem, discrimination height.
Above-mentioned described illuminator comprises led light source and the catoptron that is installed on the pcb board, and the light that led light source sends is through entering the light turnover interface of prism after the mirror reflects, again through shining the fingerprint recognition face after the fully reflecting surface reflection.Led light source is integrated on the pcb board, can make the total system structure compact more, reduces volume.
Above-mentioned described prism be by refractive index greater than 1 plastics manufacturing, compare with glass prism, can reduce the weight and volume of product greatly, be fit to large-scale industrial production simultaneously.
Included angle A 2 scopes at above-mentioned described fingerprint recognition face and light turnover interface are that 90 degree are to 150 degree; Included angle A 1 scope at fully reflecting surface and light turnover interface is that 83.1 degree are to 43.1 degree.
The light path of above-mentioned described illuminator and the light path of optical imaging system are reversible in prism inside.The feasible fingerprint recognition face light that shines is more even, improves the quality of image.
The light path and the optical imaging system of above-mentioned described prism and illuminator are installed on the corresponding structure part.
Above-mentioned described described sensitive chip and led light source are installed on the same pcb board, make structure compact more, reduce system bulk.
4, description of drawings:
Below in conjunction with accompanying drawing the utility model is done detailed explanation:
Fig. 1 is a decomposing schematic representation of the present utility model;
Fig. 2 is the sectional view of prism of the present utility model;
Fig. 3 is the vertical view of this practical nova;
Fig. 4 is the A-A cut-open view of Fig. 3;
Fig. 5 is the B-B cut-open view of Fig. 3.
5, embodiment:
As Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, the utility model includes structural member 1, led light source 2, prism 3, imaging len 4 and sensitive chip 5, led light source 2, prism 3, imaging len 4 and sensitive chip 5 are installed on the structural member 1, described prism 3 comprises four function faces: background surfaces 34, fingerprint recognition face 33, fully reflecting surface 32, light turnover interface 31, wherein fingerprint recognition face 33 is planes and relative with fully reflecting surface 32, background surfaces 34 is relative with light turnover interface 31, illuminator arrives fingerprint recognition face 33 with irradiate light, people's fingerprint is by after being pressed in fingerprint recognition face 33, carried out the secondary total reflection by fully reflecting surface 32 again after total reflection function when light runs into the part of fingerprint protrusion on the fingerprint recognition face 33 is destroyed, go out from light turnover interface then; Run into the part of fingerprint depression when light, total reflection and directive background surfaces 34 take place in light on fingerprint recognition face 33, background surfaces 34 is coated with black, under the cooperation of background surfaces 34, pass in and out interface 31 from light, the part that fingerprint protrudes forms the white of light, and the part of fingerprint depression forms the binaryzation that black is realized fingerprint image.Background surfaces 34 can be the set face that plane, curved surface, a plurality of face combine, and for example: background surfaces 34 can be that a plurality of planes are formed.Prism 3 is greater than 1 plastics manufacturing by refractive index, rear at prism 3 also is provided with optical imaging system, this optical imaging system comprises catoptron 6, Guang Lan hole 71, imaging len 4, the fingerprint image of binaryzation through catoptron 6 reflections after through imaging on the sensitive chip 5 behind Guang Lan hole 71, the imaging len 4.Illuminator comprises led light source 2 and the catoptron 8 that is installed on the pcb board 13, enters the light turnover interface 31 of prism 3 after the light that led light source 2 sends reflects through catoptron 8, again through shining fingerprint recognition face 33 after fully reflecting surface 32 reflections.Fingerprint recognition face 33 is that 90 degree are to 150 degree with included angle A 2 scopes at light turnover interface 31; Fully reflecting surface 32 is that 83.1 degree are to 43.1 degree with included angle A 1 scope at light turnover interface 31.The light path of prism 3 and illuminator and optical imaging system are installed on the structural member 1.Described sensitive chip 5 and led light source 2 are installed on the same pcb board 13.
Described structural member 1 comprises loam cake 11, shell block structural member 12, prism 3 is installed in the cavity 121 of shell block structural member 12, loam cake 11 is installed on shell block structural member 12 end faces, pcb board 13 is installed in shell block structural member 12 bottoms, the fingerprint recognition face 33 of prism 3 exposes out from the window 111 that loam cake 11 is provided with, and described catoptron 6 and catoptron 8 are installed in loam cake 11 bottom surfaces and a side relative with the light turnover interface 31 of prism 3.Catoptron 6 and catoptron 8 are set respectively directly over sensitive chip 5 and led light source 2.Described imaging len 4 is between catoptron 6 and sensitive chip 5, and imaging len 4 is installed in lens barrel 7 the insides and trim ring 9 compresses, and lens barrel 7 outside surfaces are provided with screw thread, and lens barrel 7 is installed on the shell block structural member 12 and with it and is threaded.Sensitive chip 5 can be a cmos image sensor.
This practical principle is: during fingerprint recognition, finger is by on the fingerprint recognition face 33 of prism 3, the light that sends from led light source 2 is through the light turnover interface 31 of catoptron 8 reflecting prisms 3 and enter prism 3, and the light that enters prism 3 arrives fingerprint recognition faces 33 through fully reflecting surface 32 reflection backs.People's fingerprint is carried out the secondary total reflection by fully reflecting surface 32 by after being pressed in fingerprint recognition face 33 after the total reflection function when light runs into the part of fingerprint protrusion on the fingerprint recognition face 33 is destroyed again, goes out from light turnover interface then; Run into the part of fingerprint depression when light, total reflection and directive background surfaces 34 take place in light on fingerprint recognition face 33, background surfaces 34 is coated with black, under the cooperation of background surfaces 34, pass in and out interface 31 from light, the part that fingerprint protrudes forms the white of light, and the part of fingerprint depression forms the binaryzation that black is realized fingerprint image.Described binaryzation is the general predicate of Computer Image Processing, is about to institute's value of giving 1 a little of the part of black in the image, and all of the part of the white of light in the image are formed values of giving 0, and computing machine can be described out the image of fingerprint by these two values.
Claims (9)
1, a kind of fingerprint identifying optical system, comprise prism (3), optical imaging system and illuminator, it is characterized in that: described prism (3) comprises four function faces: background surfaces (34), fingerprint recognition face (33), fully reflecting surface (32), light turnover interface (31), wherein fingerprint recognition face (33) is plane and relative with fully reflecting surface (32), background surfaces (34) is relative with light turnover interface (31), illuminator arrives fingerprint recognition face (33) with irradiate light, people's fingerprint is by after being pressed in fingerprint recognition face (33), carried out the secondary total reflection by fully reflecting surface (32) again after total reflection function when light runs into the part of fingerprint protrusion on the fingerprint recognition face (33) is destroyed, go out from light turnover interface then; Run into the part of fingerprint depression when light, light is gone up at fingerprint recognition face (33) total reflection and directive background surfaces (34) is taken place, background surfaces (34) is coated with black, under the cooperation of background surfaces (34), pass in and out interface (31) from light, the part that fingerprint protrudes forms the white of light, and the part of fingerprint depression forms the binaryzation that black is realized fingerprint image.
2, a kind of fingerprint identifying optical system according to claim 1 is characterized in that: background surfaces (34) can be the set face that plane, curved surface, a plurality of face combine.
3, a kind of fingerprint identifying optical system according to claim 1 and 2, it is characterized in that: the rear at prism (3) also is provided with optical imaging system, this optical imaging system comprises catoptron (6), Guang Lan hole (71), imaging len (4), the fingerprint image of binaryzation through catoptron (6) reflection after through imaging on the sensitive chip (5) behind Guang Lan hole (71), the imaging len (4).
4, a kind of fingerprint identifying optical system according to claim 3, it is characterized in that: illuminator comprises led light source (2) and the catoptron (8) that is installed on the pcb board (13), enter the light turnover interface (31) of prism (3) after the light that led light source (2) sends reflects through catoptron (8), pass through shining fingerprint recognition face (33) after fully reflecting surface (32) reflects again.
5, a kind of fingerprint identifying optical system according to claim 1 and 2 is characterized in that: fingerprint recognition face (33) is that 90 degree are to 150 degree with included angle A 2 scopes at light turnover interface (31); Fully reflecting surface (32) is that 83.1 degree are to 43.1 degree with included angle A 1 scope at light turnover interface (31).
6, a kind of fingerprint identifying optical system according to claim 1 and 2 is characterized in that: prism (3) is greater than 1 plastics manufacturing by refractive index.
7, a kind of fingerprint identifying optical system according to claim 4 is characterized in that: the light path of illuminator and the light path of optical imaging system are reversible in prism (3) inside.
8, a kind of fingerprint identifying optical system according to claim 7 is characterized in that: the light path of prism (3) and illuminator and optical imaging system are installed on the structural member (1).
9, a kind of fingerprint identifying optical system according to claim 4 is characterized in that: described sensitive chip (5) and led light source (2) are installed on the same pcb board (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200444515U CN201233606Y (en) | 2008-02-27 | 2008-02-27 | Fingerprint recognition optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200444515U CN201233606Y (en) | 2008-02-27 | 2008-02-27 | Fingerprint recognition optical system |
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| Publication Number | Publication Date |
|---|---|
| CN201233606Y true CN201233606Y (en) | 2009-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200444515U Expired - Fee Related CN201233606Y (en) | 2008-02-27 | 2008-02-27 | Fingerprint recognition optical system |
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| Country | Link |
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| CN (1) | CN201233606Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964058A (en) * | 2010-09-20 | 2011-02-02 | 深圳百佳安生物识别技术有限公司 | Thin optical fingerprint scanner |
| CN102467660A (en) * | 2010-10-28 | 2012-05-23 | 金佶科技股份有限公司 | Optical fingerprint recognition system |
| CN103049138A (en) * | 2011-10-12 | 2013-04-17 | 光宝新加坡有限公司 | Integrated optical module and finger scanning device thereof |
| CN106127194A (en) * | 2016-08-19 | 2016-11-16 | 浙江凯拓机电有限公司 | A kind of fingerprint collecting device |
| TWI601074B (en) * | 2013-12-27 | 2017-10-01 | Nec Corp | Certification devices and certification prism body |
-
2008
- 2008-02-27 CN CNU2008200444515U patent/CN201233606Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964058A (en) * | 2010-09-20 | 2011-02-02 | 深圳百佳安生物识别技术有限公司 | Thin optical fingerprint scanner |
| CN101964058B (en) * | 2010-09-20 | 2015-03-04 | 深圳百佳安生物识别技术有限公司 | Thin optical fingerprint scanner |
| CN102467660A (en) * | 2010-10-28 | 2012-05-23 | 金佶科技股份有限公司 | Optical fingerprint recognition system |
| CN102467660B (en) * | 2010-10-28 | 2013-11-06 | 金佶科技股份有限公司 | Optical fingerprint recognition system |
| CN103049138A (en) * | 2011-10-12 | 2013-04-17 | 光宝新加坡有限公司 | Integrated optical module and finger scanning device thereof |
| TWI601074B (en) * | 2013-12-27 | 2017-10-01 | Nec Corp | Certification devices and certification prism body |
| US10402622B2 (en) | 2013-12-27 | 2019-09-03 | Nec Corporation | Authentication apparatus and prism member for authentication |
| US10474871B2 (en) | 2013-12-27 | 2019-11-12 | Nec Corporation | Authentication apparatus and prism member for authentication |
| US10474870B2 (en) | 2013-12-27 | 2019-11-12 | Nec Corporation | Authentication apparatus and prism member for authentication |
| US10474869B2 (en) | 2013-12-27 | 2019-11-12 | Nec Corporation | Authentication apparatus and prism member for authentication |
| CN106127194A (en) * | 2016-08-19 | 2016-11-16 | 浙江凯拓机电有限公司 | A kind of fingerprint collecting device |
| CN106127194B (en) * | 2016-08-19 | 2022-05-06 | 浙江凯拓机电有限公司 | Fingerprint acquisition instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090506 Termination date: 20150227 |
|
| EXPY | Termination of patent right or utility model |