CN204515797U - A kind of fingerprint acquisition device - Google Patents
A kind of fingerprint acquisition device Download PDFInfo
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- CN204515797U CN204515797U CN201520186449.1U CN201520186449U CN204515797U CN 204515797 U CN204515797 U CN 204515797U CN 201520186449 U CN201520186449 U CN 201520186449U CN 204515797 U CN204515797 U CN 204515797U
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- fingerprint
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Abstract
The utility model relates to fingerprint recognition field, particularly relate to the fingerprint acquisition device that a kind of structure is simple, with low cost, imaging effect is good, comprise acquisition window, lighting source and imageing sensor, described acquisition window is the fibre faceplate or light cone that are made up of fiber matrix, the finger of collected main body is positioned over the upper surface of described acquisition window, and the lower surface of described acquisition window presents light and dark fingerprint image.The design of a kind of fingerprint acquisition device of the utility model, low cost of manufacture, small product size are little, lightweight, assembling is simple, imaging effect is good.
Description
Technical field
The utility model relates to fingerprint recognition field, particularly relates to a kind of fingerprint acquisition device.
Background technology
In prior art, optical fingerprint acquisition instrument is widely used fingerprint acquisition device in fingerprint recognition system, and it utilizes the total reflection law of light that concavo-convex for fingerprint uneven crestal line, valley line are imaged as light and dark striped.Because traditional fingerprint acquisition instrument adopts prism as acquisition window, thus cause image to occur serious distortion and compression, in order to solve distortion, need to increase in the optical path the lens of calibration, cylindrical mirror or prism, thus it is complicated to result in assembling, the problem that cost is high, and due to image different in the compression factor of different directions, in order to obtain equal resolution, needing the resolution increasing imageing sensor, this adds increased manufacturing cost.
Utility model content
In order to solve the problems of the technologies described above, the utility model provides the fingerprint acquisition device that a kind of structure is simple, with low cost, imaging effect is good.
A kind of fingerprint acquisition device of the present utility model, comprise acquisition window, lighting source and imageing sensor, described acquisition window is the fibre faceplate or light cone that are made up of fiber matrix, the finger of collected main body is positioned over the upper surface of described acquisition window, and the lower surface of described acquisition window presents light and dark fingerprint image.
Further, described fingerprint acquisition device also comprises optically detecting imaging lens, and described optically detecting imaging lens is arranged at below the light path of acquisition window.
Further, described optically detecting imaging lens is the optical frames head group of single group or many arrangements of mirrors sheet composition.
Further, described imageing sensor is CCD or cmos image sensor.
By such scheme, the utility model at least has the following advantages: low cost of manufacture, small product size are little, lightweight, assembling is simple, imaging effect is good.
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be implemented according to the content of instructions, coordinates accompanying drawing to be described in detail as follows below with preferred embodiment of the present utility model.
Accompanying drawing explanation
Fig. 1 is the first structural representation of a kind of fingerprint acquisition device of the utility model;
Fig. 2 is the light path schematic diagram of the acquisition window of a kind of fingerprint acquisition device under soffit lighting mode shown in Fig. 1;
Fig. 3 is the light path schematic diagram of the acquisition window of a kind of fingerprint acquisition device shown in Fig. 1 under side or overhead illumination mode;
Fig. 4 is the second structural representation of a kind of fingerprint acquisition device of the utility model.
1, acquisition window; 2, reflective mirror; 3, lighting source; 4, optically detecting imaging lens; 5, imageing sensor; 101, light; 102, optical fiber; 201, imaging surface.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples for illustration of the utility model, but are not used for limiting scope of the present utility model.
Shown in Fig. 1-4, a kind of fingerprint acquisition device, comprise acquisition window 1, lighting source 3 and imageing sensor 5, acquisition window 1 is the fibre faceplate or light cone that are made up of fiber matrix, the finger of collected main body is positioned over the upper surface of acquisition window 1, and the lower surface of acquisition window 1 presents light and dark fingerprint image.Fingerprint acquisition device also comprises reflective mirror 2 and optically detecting imaging lens 4, and optically detecting imaging lens 4 is arranged at below the light path of acquisition window 1.Optically detecting imaging lens 4 is the optical frames head group of single group or many arrangements of mirrors sheet composition.Imageing sensor 5 is CCD or cmos image sensor.
As shown in Figure 2, when the finger contact of collected main body is to the upper surface of acquisition window 1, fingerprint ridge line contacts with acquisition window 1, fingerprint valley does not contact with acquisition window 1, when light 101 is transferred to the upper surface of acquisition window 1 from the lower surface of acquisition window 1 by optical fiber 102, there is transmission in the light 101 of the fingerprint ridge line part contacted with acquisition window 1, the light 101 of the fingerprint valley part do not contacted with acquisition window 1 reflects, and be transferred to the lower surface of acquisition window 1 at this by optical fiber 102, thus form light and dark fingerprint at the lower surface of acquisition window 1, wherein fingerprint ridge line forms dark fringe, fingerprint valley forms bright fringes, system acquisition also stores the fingerprint picture pointed.
As shown in Figure 3, when the finger contact of collected main body is to acquisition window 1, fingerprint ridge line contacts with acquisition window 1, fingerprint valley does not contact with acquisition window 1, when light 101 is irradiated to finger from the side pointed or top, light 101 penetrates finger transmission downwards, and transmission occurs the light 101 of the fingerprint ridge line part contacted with acquisition window 1, light 101 enters optical fiber 102 from the upper performance of acquisition window 1, and is transferred to the lower surface of acquisition window 1 by optical fiber 102.There is scattering and reflection in the light 101 of the fingerprint valley part do not contacted with acquisition window 1, relative to fingerprint ridge line part, only have small part light 101 to enter optical fiber 102 and be transferred to the lower surface of acquisition window 1 by optical fiber 102, thus form light and dark fingerprint image at the lower surface of acquisition window 1, wherein fingerprint ridge line forms bright fringes, fingerprint valley forms dark fringe, and system acquisition also stores the fingerprint picture pointed.
As shown in Figure 4, be another kind of version of the present utility model, only have acquisition window 1, imageing sensor 5 and lighting source 3, there is no reflective mirror 2, optically detecting imaging lens 4.Wherein acquisition window 1 and imageing sensor 5 integrate, protectiveness glass of the prior art is replaced to acquisition window 1, acquisition window 1 adopts the fibre faceplate or light cone that are made up of fiber matrix simultaneously, and with imageing sensor 5 is packaged together, the spacing of the lower surface of acquisition window 1 and the imaging surface 201 of imageing sensor 5 is very little, can accomplish to be less than 0.1 millimeter, fingerprint image on acquisition window 1 lower surface can be directly delivered on imageing sensor 5, according to the size of the single pixel of imageing sensor 5 and the coupling of optical fiber core diameter, the fingerprint image that thickness is very little and resolution is very high can be obtained.
A kind of fingerprint acquisition device of the present utility model has two kinds of versions, and one transmits image information to imageing sensor 5 by optically detecting imaging lens 4, and image information is directly transferred to imageing sensor 5 by acquisition window 1 by another kind.A kind of fingerprint acquisition device low cost of manufacture of the present utility model, small product size are little, lightweight, assembling is simple, imaging effect is good.
The above is only preferred implementation of the present utility model; be not limited to the utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.
Claims (4)
1. a fingerprint acquisition device, comprise acquisition window, lighting source and imageing sensor, it is characterized in that, described acquisition window is the fibre faceplate or light cone that are made up of fiber matrix, the finger of collected main body is positioned over the upper surface of described acquisition window, and the lower surface of described acquisition window presents light and dark fingerprint image.
2. a kind of fingerprint acquisition device as claimed in claim 1, is characterized in that, described fingerprint acquisition device also comprises optically detecting imaging lens, and described optically detecting imaging lens is arranged at below the light path of acquisition window.
3. a kind of fingerprint acquisition device as claimed in claim 2, is characterized in that, described optically detecting imaging lens is the optical frames head group of single group or many arrangements of mirrors sheet composition.
4. a kind of fingerprint acquisition device as claimed in claim 1, is characterized in that, described imageing sensor is CCD or cmos image sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520186449.1U CN204515797U (en) | 2015-03-31 | 2015-03-31 | A kind of fingerprint acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520186449.1U CN204515797U (en) | 2015-03-31 | 2015-03-31 | A kind of fingerprint acquisition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204515797U true CN204515797U (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520186449.1U Expired - Fee Related CN204515797U (en) | 2015-03-31 | 2015-03-31 | A kind of fingerprint acquisition device |
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| Country | Link |
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| CN (1) | CN204515797U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017156975A1 (en) * | 2016-03-16 | 2017-09-21 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
-
2015
- 2015-03-31 CN CN201520186449.1U patent/CN204515797U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017156975A1 (en) * | 2016-03-16 | 2017-09-21 | 上海箩箕技术有限公司 | Optical fingerprint sensor module |
| US10832028B2 (en) | 2016-03-16 | 2020-11-10 | Shanghai Oxi Technology Co., Ltd | Optical fingerprint module |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20150729 Termination date: 20180331 |
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| CF01 | Termination of patent right due to non-payment of annual fee |