CN201429854Y - Novel optical fingerprint sensor based on USB and holographic technology - Google Patents
Novel optical fingerprint sensor based on USB and holographic technology Download PDFInfo
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- CN201429854Y CN201429854Y CN200920126348XU CN200920126348U CN201429854Y CN 201429854 Y CN201429854 Y CN 201429854Y CN 200920126348X U CN200920126348X U CN 200920126348XU CN 200920126348 U CN200920126348 U CN 200920126348U CN 201429854 Y CN201429854 Y CN 201429854Y
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- holographic grating
- lens combination
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- fingerprint
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Abstract
The utility model relates to an optical fingerprint collecting device, particularly to a novel optical fingerprint sensor based on a USB and the holographic technology. The novel optical fingerprint sensor acquires fingerprint images by utilizing the holographic technology and can output the corresponding fingerprint image data through the USB in time after an image sensor CCD and an ARM or DSP process the fingerprint images. The fingerprint sensor comprises a semiconductor laser diode, an image sensor CCD, a microprocessor DSP or ARM, a USB interface and a power circuit; a lens group and a holographic grating unit are arranged between the semiconductor laser diode and the image sensor CCD; the unit comprises a lens group 1, a lens group 2 and a holographic grating, wherein the lens group1 is connected with the laser output of the semiconductor laser diode; the lens group 2 is connected with the input of the image sensor CCD; an optical axis of the lens group 1 and the plane of the holographic grating form an included angle of 45 degree; and an optical axis of the lens group 2 is perpendicular to the plane of the holographic grating. The utility model has the advantages of low manufacturing cost and strong imaging capability, can acquires high-definition orthoscopic and undistorted fingerprint images, and is easy to miniaturize and produce.
Description
Technical field
The utility model relates to a kind of optical finger print harvester, particularly a kind of holographic technique that utilizes obtains fingerprint image, and, can in time export the novel optical fingerprint sensor based on USB and holographic technique of corresponding fingerprint image data by USB by after CCD conversion and ARM or the DSP processing.
Background technology
The optical finger print acquisition technique be the most ancient also be present most widely used fingerprint collecting technology, the optical finger print collecting device starts from 1971, traditional method is to utilize the total reflection of prism (FTIR) to obtain the fingerprint picture at present, utilize this method to have serious aberration, and picture is compressed on certain direction
In 1996, holography of handles such as the R.D.Bahuguna of the U.S. and total reflection technology combine and have worked out a kind of novel prism fingerprint sensor, the serious problems of conventional optical fingerprint capture have been solved well, thereby avoid using complicated precision optics corrective system and treatment for correcting software, but it makes inconvenience, and making requires high, uses the influence that is subjected to a certain degree.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of novel optical fingerprint sensor based on USB and holographic technique is provided, and its cost of manufacture is low, and imaging capability is good, can obtain high-resolution, undistorted, undistorted fingerprint picture.
For realizing that the purpose of this utility model has adopted following technical scheme: a kind of novel optical fingerprint sensor based on USB and holographic technique, include semiconductor laser diode, CCD image sensor, microprocessor DSP or ARM, USB interface and power circuit, it is characterized in that between semiconductor laser diode and CCD image sensor, being provided with a lens combination and holographic grating unit, this unit is by first lens combination, second lens combination and holographic grating constitute, first lens combination is connected with the laser output of semiconductor laser diode, and second lens combination is connected with the input of CCD image sensor.
The optical axis of aforesaid first lens combination and holographic grating plane angle at 45, the optical axis of aforementioned second lens combination is vertical with the holographic grating plane.
Aforesaid holographic grating adopts the coherent light that is walked abreast by two bundles to be 45 ° of angles and is mapped to the holographic grating after the exposure flushing on the holographic dry plate.
A kind of novel optical fingerprint sensor that provides by the utility model based on USB and holographic technique, semiconductor laser diode links to each other with lens combination and holographic grating unit with power circuit, power circuit provides power supply for semiconductor laser diode, send laser after the semiconductor laser diode power supply, shine lens combination and holographic grating unit; Lens combination and holographic grating unit link to each other with CCD image sensor, when finger is pressed on the grating in lens combination and holographic grating unit, this unit passes to CCD image sensor by laser with finger print information, and being converted to fingerprint digital picture information by CCD image sensor, power circuit provides power supply for CCD image sensor; CCD image sensor links to each other with microprocessor DSP or ARM, microprocessor DSP or ARM link to each other with power circuit with USB interface simultaneously, power circuit provides power supply for microprocessor DSP or ARM, and CCD image sensor is read fingerprint image data under the control of microprocessor DSP or ARM, and be converted to the data that satisfy the USB interface host-host protocol, by USB output fingerprint image data.Lens combination and holographic grating unit mainly are made up of lens combination 1, holographic grating and lens combination 2 three parts, lens combination 1 expands bundle with the laser that semiconductor laser diode sends, and shine on the holographic grating with 45 ° of angles, when finger is pressed on holographic grating, shine on the lens combination 2 from just carrying finger print information, see through lens combination 2 and just shine CCD image sensor perpendicular to holographic grating direction emitting laser.The principle that lens combination and holographic grating unit obtain fingerprint is: use monochromatic collimated beam with 45 ° of angles, when shining the glass surface of the holographic grating behind that is pressed with fingerprint on the holographic grating, its catoptrical amount depends on ridge and the degree of depth of paddy and grease and the moisture between skin and glass that is pressed in the glass surface fingerprint, reflection ray is once more by behind the grating, penetrate from plane perpendicular to grating, it is the fingerprint picture that the light that penetrates is carrying finger print information, and the normal of fingerprint picture and the optical axis coincidence of lens combination, thereby eliminate the distortion of fingerprint picture, not only solved the aberration in the traditional optical total reflection fingerprint sensor technology, problems such as compression of images, its image contrast height, and image planes are vertical with optical axis, therefore have good imaging capability, can see the glandular orifice on the fingerprint ridge after the scioptics group is amplified fully clearly.The utility model cost of manufacture is low, and imaging capability is strong, can obtain high-resolution, undistorted, undistorted fingerprint picture, is easier to miniaturization, commercialization.
Description of drawings
The utility model has following accompanying drawing:
Fig. 1 is a connection diagram of the present utility model;
Fig. 2 is the synoptic diagram and the index path of lens combination of the present utility model and holographic grating unit;
Fig. 3 is a holographic grating making synoptic diagram of the present utility model.
Embodiment
Embodiment of the present utility model is described with reference to the accompanying drawings, as shown in Figure 1-Figure 3, a kind of novel optical fingerprint sensor based on USB and holographic technique, include semiconductor laser diode, CCD image sensor, microprocessor DSP or ARM, USB interface and power circuit, it is characterized in that between semiconductor laser diode and CCD image sensor, being provided with a lens combination and holographic grating unit, this unit is by lens combination 1, lens combination 2 and holographic grating constitute, lens combination 1 is connected with the laser output of semiconductor laser diode, and lens combination 2 is connected with the input of CCD image sensor.The optical axis of aforesaid lens combination 1 and holographic grating plane angle at 45, the optical axis of aforementioned lens combination 2 is vertical with the holographic grating plane.Aforesaid holographic grating adopts the coherent light that is walked abreast by two bundles to be 45 ° of angles and is mapped to the holographic grating after the exposure flushing on the holographic dry plate.This holographic grating making is simple, and is convenient, with low cost.
Claims (3)
1, a kind of novel optical fingerprint sensor based on USB and holographic technique, include semiconductor laser diode, CCD image sensor, microprocessor DSP or ARM, USB interface and power circuit, it is characterized in that between semiconductor laser diode and CCD image sensor, being provided with a lens combination and holographic grating unit, this unit is made of first lens combination (1), second lens combination (2) and holographic grating, first lens combination (1) is connected with the laser output of semiconductor laser diode, and second lens combination (2) is connected with the input of CCD image sensor.
2, by the described novel optical fingerprint sensor of claim 1 based on USB and holographic technique, it is characterized in that optical axis and the holographic grating plane angle at 45 of aforesaid first lens combination (1), the optical axis of aforementioned second lens combination (2) is vertical with the holographic grating plane.
3,, it is characterized in that aforesaid holographic grating adopts the coherent light that is walked abreast by two bundles to be 45 ° of angles and is mapped to the holographic grating after the exposure flushing on the holographic dry plate by the described novel optical fingerprint sensor of claim 1 based on USB and holographic technique.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920126348XU CN201429854Y (en) | 2009-02-18 | 2009-02-18 | Novel optical fingerprint sensor based on USB and holographic technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920126348XU CN201429854Y (en) | 2009-02-18 | 2009-02-18 | Novel optical fingerprint sensor based on USB and holographic technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201429854Y true CN201429854Y (en) | 2010-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920126348XU Expired - Fee Related CN201429854Y (en) | 2009-02-18 | 2009-02-18 | Novel optical fingerprint sensor based on USB and holographic technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201429854Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890773A (en) * | 2011-07-21 | 2013-01-23 | 常熟安智生物识别技术有限公司 | Membership system-based palm vein identification system |
| CN104297831A (en) * | 2014-10-28 | 2015-01-21 | 北京思比科微电子技术股份有限公司 | Grating of optical fingerprint sensor chip module and manufacturing method for grating |
-
2009
- 2009-02-18 CN CN200920126348XU patent/CN201429854Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890773A (en) * | 2011-07-21 | 2013-01-23 | 常熟安智生物识别技术有限公司 | Membership system-based palm vein identification system |
| CN104297831A (en) * | 2014-10-28 | 2015-01-21 | 北京思比科微电子技术股份有限公司 | Grating of optical fingerprint sensor chip module and manufacturing method for grating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100324 Termination date: 20120218 |