CN202748805U - Flat fingerprint gatherer - Google Patents
Flat fingerprint gatherer Download PDFInfo
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- CN202748805U CN202748805U CN 201220423349 CN201220423349U CN202748805U CN 202748805 U CN202748805 U CN 202748805U CN 201220423349 CN201220423349 CN 201220423349 CN 201220423349 U CN201220423349 U CN 201220423349U CN 202748805 U CN202748805 U CN 202748805U
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- collection prism
- reflecting surface
- light source
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Abstract
The present utility model provides a flat fingerprint gatherer which comprises an upper cover, a shell, an acquisition prism, a light source, an imaging device, a circuit board and a pedestal. The gatherer is characterized in that the light source is arranged on the side surface of the acquisition prism, light enters form the side surface of the acquisition prism and used for reflecting collected fingerprint images to the imaging device for imaging though a first reflection surface, a second reflection surface and a light emitting surface; the light source is arranged on the side surface of the acquisition prism, uniformity of light shining on the acquisition surface is better, halation of dark background environment destroying fingerprint imaging will not be generated, thus the effect of dry finger imaging is good. The light source is arranged on the side surface of the acquisition prism, thickness of the fingerprint gatherer is reduced, the whole volume of the fingerprint gatherer is reduced, a miniaturization requirement of the fingerprint gatherer in the market is satisfied; and the imaging effect of fingerprint images on the fingerprint gatherer is improved.
Description
Technical field
The utility model belongs to fingerprint image and catches identification art field, is specifically related to a kind of flat sensor construction fingerprint capturer.
Background technology
Optical fingerprint acquisition instrument utilizes the light optical difference that crestal line valley line difference causes during because of finger contact on the interface to form image and gathers.
In optical fingerprint collector, the installation site of light source not only can affect the size of fingerprint capturer overall dimensions, also can affect the imaging effect of the fingerprint image that collects at last.In the prior art, light source is positioned over the bottom of Collection prism or side following (referring to Fig. 1) usually, and the bottom that light source 43 is placed on Collection prism 44 can increase the thickness of Acquisition Instrument, increases the volume of fingerprint capturer; When light source 41 is positioned over the side bottom of Collection prism 42, because the light of surface of light source can at prism inner counter interflection, if will avoid the reflector space of light source 41, then will increase the width that prism gathers face, thereby increase the volume of Collection prism 42, strengthen the size of fingerprint capturer.As shown in Figure 2, light source 13 is installed in Collection prism 12 bottoms or side is following, and the illumination that light source 13 sends is mapped on the second reflecting surface can at obvious halation 15 of fingerprint image 16 fronts stack, affect the effect of fingerprint image.Simultaneously, the light that light source 13 shines on the second reflecting surface will destroy the dark background environment, and the background color of fingerprint image is illuminated, thereby make the imaging effect variation of doing finger.In the patent No. is 201020100724.0 patent, the scheme of black cavity is installed in employing in prism straight middle surface one side, absorb light by the black cavity, improved image quality, yet, in the situation that Collection prism equal volume, the black cavity can increase the overall volume of fingerprint capturer, just can only reduce the Collection prism longitudinal length if add the volume that will reduce fingerprint capturer behind the black cavity, the gathered area that reduces meeting downscaled images sensor of Collection prism longitudinal length, thus the fingerprint recognition effect affected.
Summary of the invention
For solving the problems of the technologies described above, a kind of flat fingerprint capturer that the utility model provides comprises loam cake, shell, Collection prism, light source, imaging device, circuit board and base, described Collection prism is the right-angled trapezium prism, described Collection prism comprises the fingerprint collecting zone of the upper surface that is positioned at Collection prism, be positioned at the light entrance face of Collection prism side, be positioned at the first reflecting surface of Collection prism bottom surface, be positioned at second reflecting surface and the light-emitting face that is positioned at the Collection prism straight middle surface of Collection prism oblique girdle plane, it is characterized in that, described light source is installed in the base side and is close to the side of Collection prism, and described light source and circuit board are electrically connected.
The size of described the first reflecting surface so that all light of the outgoing from the fingerprint collecting zone that receives can be successively through the reflection of the first reflecting surface and the second reflecting surface from the light-emitting face outgoing.
There is a border circular areas at described Collection prism light-emitting face center, and light-emitting face is all blackings except border circular areas; Described border circular areas size so that from the reflection of the second reflecting surface from all outgoing in the border circular areas of the light of the first reflecting surface.
Described Collection prism bottom surface is all used pitch-dark blacking except the first reflecting surface.
Described loam cake is made of housing and fingerprint collecting window; The size in fingerprint collecting zone and fingerprint collecting window size are complementary.
Described loam cake and floor installation are on shell.
Described base is comprised of the device cavity of the prism cavity that Collection prism is installed, the light source cavity that light source is installed and installation imaging device, and there is a round hole in the base centre between light source cavity and the device cavity; The geomery of described prism cavity and the geomery of Collection prism are complementary, and after Collection prism was installed in the prism cavity, the size of the light-emitting face central circular of Collection prism was corresponding with described round hole.
Described round hole is used for the light of light-emitting face central circular outgoing is transmitted to imaging device, the shape size of round hole and the size of imaging device are complementary, and the imaging center position of the center of described light-emitting face central circular, the center of round hole, imaging device and the optical axis center of the second reflecting surface emergent light are point-blank.
Described imaging device is made of lens combination and imageing sensor, described lens combination is the fix-focus lens module, described imageing sensor is cmos sensor, imageing sensor is perpendicular to the straight middle surface of Collection prism, be installed on the circuit board, the center of the imaging center of described imaging device, the center of round hole, light-emitting face central circular and the optical axis center of the second reflecting surface are point-blank.
Described circuit board is installed on the base, near Collection prism straight middle surface one side.
The utility model is installed in the Collection prism side with light source, and the overall volume of fingerprint capturer is reduced; The homogeneity of irradiation on collection face is better, can not produce the halation of the dark background environment that destroys fingerprint imaging, thereby makes dried finger imaging effect good.Cmos image sensor is convenient to direct shooting perpendicular to the Collection prism straight middle surface, reduces the space, reduces assembly difficulty.Base centre perforate between light source cavity and device cavity allows light be transmitted to cmos image sensor by perforate, does not need additionally to provide the light illuminating anchor point.Simultaneously perforate can be used as anchor point, and anchor point need not the special process processing.Satisfy on the market the requirement to the optical fingerprint collector miniaturization.
Description of drawings
Fig. 1 is the light source position figure of prior art;
Fig. 2 is the index path of prior art;
Fig. 3 is stereographic map of the present utility model;
Fig. 4 is scheme of installation of the present utility model;
Fig. 5 is section index path of the present utility model;
Fig. 6 is illumination schematic diagram of the present utility model.
Embodiment
Preferred embodiment of the present utility model is described with reference to the accompanying drawings, and specific embodiment described herein is only in order to explaining the utility model, and is not used in restriction the utility model.
Referring to Fig. 3, Fig. 4, Fig. 5, Fig. 6, a kind of flat fingerprint capturer comprises: loam cake 1, shell 2, Collection prism 3, light source 4, imaging device 5, circuit board 6, base 7.
During installation, Collection prism 3 is installed in the prism cavity D of base 7, light-emitting face 34 central circular 36 are corresponding with the round hole F of base 7, can adopt what Collection prism 3 side not polishings part and base 7 joined local gluingly fixes the two, circuit board 6 is installed in the afterbody of base 7 near Collection prism 3 straight middle surfaces one side, and is fixed by screws on the base 7.Light source 4 is installed in the light source cavity C of base 7, is close to the light entrance face 35 that is installed in the Collection prism in the prism cavity D, and is electrically connected with circuit board, and is luminous by circuit board 6 controls.Imaging device 5 is installed in the device cavity E of base 7, and F is corresponding with round hole, and is fixed on the circuit board 6.
The image-forming principle of the present embodiment is: the light that light source sends shines on the collection face, be radiated at the valley line place greater than the light of the angle of total reflection up and down two surperficial experiences total internal reflection in Collection prism 3 inside, be radiated at the crestal line place and changed total reflection condition greater than the light of the angle of total reflection because of the close contact of crestal line, a part is absorbed by the finger coupling, diffuse reflection occurs in a part, and diffuse light shines on the first reflecting surface 32.The first reflecting surface 32 with the light reflection of the crestal line place reflection that receives to the second reflecting surface 33, the second reflecting surface 33 will be from the light reflection of the first reflecting surface 32 to light-emitting face 34 central circular 36, imaging device 5 receives the image formation by rays that transmits from light-emitting face 34 central circular 36, thereby obtains a secondary crestal line place darker fingerprint image in brighter valley line place.
Those skilled in the art can also carry out various modifications to above content under the condition that does not break away from the definite spirit and scope of the present utility model of claims.Therefore scope of the present utility model is not limited in above explanation, but determined by the scope of claims.
Claims (10)
1. flat fingerprint capturer, comprise loam cake, shell, Collection prism, light source, imaging device, circuit board and base, described Collection prism is the right-angled trapezium prism, described Collection prism comprises the fingerprint collecting zone of the upper surface that is positioned at Collection prism, be positioned at the light entrance face of Collection prism side, be positioned at the first reflecting surface of Collection prism bottom surface, be positioned at second reflecting surface and the light-emitting face that is positioned at the Collection prism straight middle surface of Collection prism oblique girdle plane, it is characterized in that, described light source is installed in the base side and is close to the side of Collection prism, and described light source and circuit board are electrically connected.
2. a kind of flat fingerprint capturer according to claim 1, it is characterized in that, the size of described the first reflecting surface so that all light of the outgoing from the fingerprint collecting zone that receives can be successively through the reflection of the first reflecting surface and the second reflecting surface from the light-emitting face outgoing.
3. a kind of flat fingerprint capturer according to claim 1 is characterized in that, there is a border circular areas at described Collection prism light-emitting face center, and light-emitting face is all blackings except border circular areas; Described border circular areas size so that from the reflection of the second reflecting surface from all outgoing in the border circular areas of the light of the first reflecting surface.
4. according to claim 1 to 3 any one described a kind of flat fingerprint capturer, it is characterized in that, described Collection prism bottom surface is all used pitch-dark blacking except the first reflecting surface.
5. a kind of flat fingerprint capturer according to claim 1 is characterized in that, described loam cake is made of housing and fingerprint collecting window; The size in fingerprint collecting zone and fingerprint collecting window size are complementary.
6. a kind of flat fingerprint capturer according to claim 1 is characterized in that, described loam cake and floor installation are on shell.
7. a kind of flat fingerprint capturer according to claim 1, it is characterized in that, described base is comprised of the device cavity of the prism cavity that Collection prism is installed, the light source cavity that light source is installed and installation imaging device, and there is a round hole in the base centre between light source cavity and the device cavity; The geomery of described prism cavity and the geomery of Collection prism are complementary, and after Collection prism was installed in the prism cavity, the size of the light-emitting face central circular of Collection prism was corresponding with described round hole.
8. a kind of flat fingerprint capturer according to claim 6, it is characterized in that, described round hole is used for the light of light-emitting face central circular outgoing is transmitted to imaging device, the shape size of round hole and the size of imaging device are complementary, and the imaging center position of the center of described light-emitting face central circular, the center of round hole, imaging device and the optical axis center of the second reflecting surface emergent light are point-blank.
9. a kind of flat fingerprint capturer according to claim 7, it is characterized in that, described imaging device is made of lens combination and imageing sensor, described lens combination is the fix-focus lens module, described imageing sensor is cmos sensor, imageing sensor is installed on the circuit board perpendicular to the straight middle surface of Collection prism, and the center of the imaging center of described imaging device, the center of round hole, light-emitting face central circular and the optical axis center of the second reflecting surface are point-blank.
10. a kind of flat fingerprint capturer according to claim 1 is characterized in that, described circuit board is installed on the base, near Collection prism straight middle surface one side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220423349 CN202748805U (en) | 2012-08-24 | 2012-08-24 | Flat fingerprint gatherer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220423349 CN202748805U (en) | 2012-08-24 | 2012-08-24 | Flat fingerprint gatherer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202748805U true CN202748805U (en) | 2013-02-20 |
Family
ID=47708168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220423349 Expired - Fee Related CN202748805U (en) | 2012-08-24 | 2012-08-24 | Flat fingerprint gatherer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202748805U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632128A (en) * | 2012-08-24 | 2014-03-12 | 成都方程式电子有限公司 | Flat fingerprint gatherer |
| CN104732631A (en) * | 2015-03-12 | 2015-06-24 | 长沙市吉盾安防科技有限公司 | Intelligent fingerprint password anti-theft lock system |
| CN107679440A (en) * | 2016-08-01 | 2018-02-09 | 安帝司股份有限公司 | Thin optical fingerprint sensor |
-
2012
- 2012-08-24 CN CN 201220423349 patent/CN202748805U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632128A (en) * | 2012-08-24 | 2014-03-12 | 成都方程式电子有限公司 | Flat fingerprint gatherer |
| CN104732631A (en) * | 2015-03-12 | 2015-06-24 | 长沙市吉盾安防科技有限公司 | Intelligent fingerprint password anti-theft lock system |
| CN107679440A (en) * | 2016-08-01 | 2018-02-09 | 安帝司股份有限公司 | Thin optical fingerprint sensor |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130220 Termination date: 20180824 |