CN105893911A - Distortionless fingerprint acquisition method - Google Patents
Distortionless fingerprint acquisition method Download PDFInfo
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- CN105893911A CN105893911A CN201410564350.0A CN201410564350A CN105893911A CN 105893911 A CN105893911 A CN 105893911A CN 201410564350 A CN201410564350 A CN 201410564350A CN 105893911 A CN105893911 A CN 105893911A
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- light
- prism
- fingerprint
- acquisition
- fingerprint collecting
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Abstract
The invention discloses a distortionless fingerprint acquisition method, relates to an optical fingerprint sensor, and especially relates to a distortionless optical fingerprint sensor. According to the invention, monochromatic light is utilized to act as a light source, dodging is carried out on the light source through a frosted surface of an acquisition prism, dodged light is directly incident on an acquisition surface of the acquisition prism, and total reflection is ensured not to happen when light on the frosted surface is incident on the acquisition surface from any angle when the prism is designed; diffuse reflection light is shot to a reflector through another surface of the acquisition prism, the reflector plays a role of replicating a light path, and a principle plane of a lens group, a sensor plane and a conjugate plane of the fingerprint acquisition surface relative to the reflector are enabled to parallel; the light is reflected by the reflector and gets into the lens group, the lens group finally enables a light beam to be imaged on the sensor plane, so that a fingerprint image with dark background is formed. Compared with the prior art, the distortionless fingerprint acquisition method is small in distortion, good in image quality and uniform in illuminance.
Description
Technical field
The present invention relates to a kind of optical fingerprint sensor, particularly relate to a kind of distortionless optical fingerprint sensor.
Can be applicable to attendance recorder, the finger print acquisition module of Ministry of Public Security's system of fingerprints.
Background technology
Fingerprint is the unique feature of human body, and its complexity be enough to provide for another characteristic of reflecting.Along with phase
Close the progressively ripe of support technology, fingerprint identification technology through development for many years become current most convenient, can
Lean on, non-invasive and low-cost biological identification technology solution, the application for significant market has very
Big development potentiality.
Fingerprint sensor is currently mainly divided into two classes, optical fingerprint sensor and semiconductor fingerprint sensor.Light
Learn fingerprint sensor: the folding mainly by light is taken the photograph and principle of reflection, and light is from bottom directive prism, and warp
Prism penetrates, angle that the light of injection reflects on the rough strain line of finger surface fingerprint and being reflected back
The bright and dark light gone will be different.The optics of CMOS or CCD will collect different bright-dark degree
Pictorial information, just complete the collection of fingerprint.Semiconductor fingerprint sensor: this kind of sensor, either electricity
Appearance formula or inductance type, its principle is similar to, is integrated with " flat board " of thousands of semiconductor device at one piece
On, finger plaster thereon with which constitute the another side of electric capacity (inductance), owing to finger flat is rough and uneven in surface,
At salient point the most different with the actual range size contacting flat board at concave point, the capacitive/inductive numerical value of formation is the most just
Different, the different numerical value collected around this principle is collected by equipment, the most just completes adopting of fingerprint
Collection.
The distortion of image is required the highest by fingerprint recognition system, therefore design clear, distort little even without abnormal
The fingerprint recognition camera lens become, is the key manufacturing finger-print recognising instrument.But current optical fingerprint acquisition system
Use serious nonlinear distortion so that the fingerprint sensor of different styles cannot a general data base, give
The unified management of finger print data brings serious trouble.Therefore, a kind of undistorted fingerprint collecting method is extremely important.
Summary of the invention
It is an object of the invention to provide for a kind of undistorted fingerprint collecting method.
The basic conception of the present invention is: undistorted fingerprint collecting method utilize monochromatic light as light source, fingerprint
Crestal line is in close contact with Collection prism, the light beam generation diffuse-reflectance being radiated on crestal line, and subsequent optical system will
The irreflexive photoimaging in fingerprint ridge line contact site, on sensor, is shown as bright line；Valley line does not contacts, light
Line still transmits Collection prism, so valley line is shown as concealed wire on a sensor, thus obtains dark background
Image；The another side of the prism that irreflexive light is the most acquired, gets on a reflecting mirror, then through thoroughly
This reflection light beam is imaged onto on sensor by mirror group, thus forms the fingerprint image of dark background.
The technical solution of the present invention is: undistorted fingerprint collecting method utilizes monochromatic light as light source, light
One frosting of the acquired prism in source carries out even light, and the light after even light is directly incident on adopting of Collection prism
On collection face, should be ensured that when designing prism the light on frosting has any angle to incide on collection face the most not
Can be totally reflected；The another side of the prism that irreflexive light is the most acquired, gets on a reflecting mirror,
The effect of reflecting mirror is light path of turning back so that the interarea of battery of lens, sensor plane, the pass in fingerprint collecting face
In the conjugate planes of reflecting mirror, three faces are parallel；Light, after reflecting mirror reflects, enters a battery of lens,
Battery of lens finally makes light beam image in the plane of sensor, thus forms the fingerprint image of dark background.
The light that described light source sends is the monochromatic light of narrow-band；
Described Collection prism contains a frosting；
Described reflecting mirror carrys out plane mirror；
Described battery of lens is three non-spherical lenses；
Compared with present technology, advantages of the present invention:
1) distort little；
2) picture quality is good；
3) uniform-illumination；
By the following description to you and example, and also by appended claim, the enforcement of the present invention
Those skilled in the art be will be apparent from by mode and benefit thereof.
Accompanying drawing explanation
In following example, it is more fully described embodiments of the present invention with reference to accompanying drawing, wherein:
Fig. 1 schematically shows the front view of undistorted fingerprint collecting method mechanical-optical setup.
Fig. 2 schematically shows the side view of undistorted fingerprint collecting method mechanical-optical setup.
Fig. 3 is the distortion figure of the fingerprint sensor designed with reference to undistorted fingerprint collecting method.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Referring to Fig. 1, for the front view of undistorted fingerprint collecting method mechanical-optical setup.Light source (30) acquired rib
One frosting (21) of mirror (20) carries out even light, and the light after even light is directly incident on Collection prism
On collection face (22), should be ensured that when designing prism the light on frosting (21) has any angle incident
All without being totally reflected on collection face (22)；The another side of the prism that irreflexive light is the most acquired,
Getting on a reflecting mirror (40), the effect of reflecting mirror (40) is light path of turning back so that battery of lens (50)
Interarea, sensor plane (60), the conjugate planes about reflecting mirror of fingerprint collecting face (22), three faces
Parallel；Light, after reflecting mirror (40) reflects, enters a battery of lens (50), and battery of lens (50) is
Make light beam image in the plane of sensor (60) eventually, thus form the fingerprint image of dark background.
Referring to Fig. 2, for the side view of undistorted fingerprint collecting method mechanical-optical setup.
Referring to Fig. 3, for the distortion figure of the fingerprint sensor that undistorted fingerprint collecting method is designed, it is clear that distortion
Less than 3%.
The above-mentioned particular implementation being described with reference to the accompanying figures is exemplary only, and is not intended to limit this
Bright scope, this scope is determined by appending claims.
Claims (5)
- The most undistorted fingerprint collecting method, utilize monochromatic light as light source, a mill of the acquired prism of light source Sand face carries out even light, and the light after even light is directly incident on the collection face of Collection prism, when designing prism Should be ensured that the light on frosting has any angle to incide on collection face all without being totally reflected；Diffuse-reflectance The another side of the most acquired prism of light, get on a reflecting mirror, the effect of reflecting mirror is light of turning back Road so that the interarea of battery of lens, sensor plane, the conjugate planes about reflecting mirror in fingerprint collecting face, three Individual face is parallel；Light, after reflecting mirror reflects, enters a battery of lens, and battery of lens finally makes light beam imaging In the plane of sensor, thus form the fingerprint image of dark background.
- Undistorted fingerprint collecting method the most according to claim 1, it is characterised in that described light source is sent out The light set out is the monochromatic light of narrow-band.
- Undistorted fingerprint collecting method the most according to claim 1, it is characterised in that described collection rib Mirror contains a frosting.
- Undistorted fingerprint collecting method the most according to claim 1, it is characterised in that described reflecting mirror Carry out plane mirror.
- Undistorted fingerprint collecting method the most according to claim 1, it is characterised in that described battery of lens It is three non-spherical lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410564350.0A CN105893911A (en) | 2014-10-22 | 2014-10-22 | Distortionless fingerprint acquisition method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410564350.0A CN105893911A (en) | 2014-10-22 | 2014-10-22 | Distortionless fingerprint acquisition method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105893911A true CN105893911A (en) | 2016-08-24 |
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ID=57000443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410564350.0A Pending CN105893911A (en) | 2014-10-22 | 2014-10-22 | Distortionless fingerprint acquisition method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105893911A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107516089A (en) * | 2017-09-08 | 2017-12-26 | 北京眼神科技有限公司 | A kind of fingerprint acquisition device |
| CN115144948A (en) * | 2021-03-29 | 2022-10-04 | 北京小米移动软件有限公司 | Light guide structure and terminal equipment thereof |
-
2014
- 2014-10-22 CN CN201410564350.0A patent/CN105893911A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107516089A (en) * | 2017-09-08 | 2017-12-26 | 北京眼神科技有限公司 | A kind of fingerprint acquisition device |
| CN115144948A (en) * | 2021-03-29 | 2022-10-04 | 北京小米移动软件有限公司 | Light guide structure and terminal equipment thereof |
| CN115144948B (en) * | 2021-03-29 | 2024-05-07 | 北京小米移动软件有限公司 | Light guide structure and terminal equipment thereof |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160824 |