CN1916937B - Integrated instrument for collecting intravital fingerprints - Google Patents
Integrated instrument for collecting intravital fingerprints Download PDFInfo
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- CN1916937B CN1916937B CN200510017227A CN200510017227A CN1916937B CN 1916937 B CN1916937 B CN 1916937B CN 200510017227 A CN200510017227 A CN 200510017227A CN 200510017227 A CN200510017227 A CN 200510017227A CN 1916937 B CN1916937 B CN 1916937B
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- prism
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- plano
- convex
- optical system
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- 238000003384 imaging method Methods 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims description 28
- 241000219739 Lens Species 0.000 description 36
- 210000000695 crystalline len Anatomy 0.000 description 36
- 210000000887 face Anatomy 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000005304 optical glass Substances 0.000 description 5
- 230000002146 bilateral effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000003760 hair shine Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000736800 Vernonia Species 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
An integral fingerprint collector of living body is prepared as using prism top surface as fingerprint collecting surface, using a slope surface at bottom of prism as light incoming surface, setting light source at external side of light incoming surface on prism, connecting image receiving surface of imaging objective set to light outgoing surface of prism, setting image receiving surface of image receiver above imaging surface of imaging objective and connecting output end of image receiver to computer.
Description
Technical field
The invention belongs to the precision optical instrument technical field, relate to a kind of fingerprint acquisition system, specifically a kind of integrated instrument for collecting intravital fingerprints.
Background technology
Live Fingerprint Collecting Instrument is a kind of special optical imaging system, and its key component comprises generation and imaging two parts of fingerprint image.But version and process that each manufacturer of the world adopts have nothing in common with each other, and most of image that is produced all has severe distortion, and complex structure.Correcting distorted method is broadly divided into two classes: a class is an optical means; Another kind of is electronics method.But for distort the easiest realization of correction of rectangle fault image with electronics method.The structural design aspect also roughly is divided into two classes: a class is a bonded process; Another kind of for separating the fixed combination method.
The Chinese patent communique discloses a kind of " fingerprint acquisition instrument " (publication number CN2598511Y), comprise the luminous circuit board of a housing, housing one end and the cmos circuit plate of the housing other end, luminous circuit board is as light source 1, and the cmos circuit plate is as picture receiver 6; Also has a prism 2 on the housing, this prism 2 is a right-angle prism, outside its inclined-plane was exposed to as sampling face, two right angle faces were positioned at housing as the plane of incidence and the exit facet of light respectively, and luminous circuit board is parallel with exit facet with the plane of incidence respectively with the cmos circuit plate.Be provided with concave and convex lenses between luminous circuit board and the prism 2, cover is to the cmos circuit plate.What this fingerprint acquisition instrument adopted is bright background image acquisition mode, and the contrast of image is descended, thereby the quality that has reduced imaging is simultaneously, fingerprint image process of school distortion and color correction difference not before the imaging on the cmos circuit plate, and the image quality of image is poor.
Summary of the invention
In order to overcome the defective of the fingerprint image image quality difference that prior art exists, the present invention is by changing the structure of prism and imaging system, adopt the dark field illumination technology and shine in inclination angle bilateral mode, improved the image quality of fingerprint acquisition system, purpose provides a kind of integrated instrument for collecting intravital fingerprints.
The present invention includes light source 1, prism 2, image-forming objective lens group 4, picture receiver 6.As shown in Figure 1, the upper surface of prism 2 is a fingerprint collecting face 14, and the plane of incidence of light source 1 light 16 has the inclined-plane of an inclination alpha, 0 °＜α≤30 ° for the both sides, bottom that are positioned at prism 2 and with prism 2 bottoms.As shown in Figure 2, light source 1 is positioned at prism 2 planes of light incidence 16 outsides.As shown in Figure 1, the exit facet 17 of reflection ray is the side near image-forming objective lens group 4, and reflecting surface 15 positions of prism 2 are relative with the exit facet 17 of reflection ray; Image-forming objective lens group 4 image receiving planes and prism 2 reflection ray exit facets 17 join; The image receiving plane of picture receiver 6 is positioned on the imaging surface of image-forming objective lens group 4; The image information output terminal of picture receiver 6 is connected on the computing machine.
The course of work of the present invention: the finger of acquisition target is positioned on the prism 2 collection faces 14, the light that light source 1 sends through the plane of incidence 16 with greater than 0 ° and smaller or equal to 30 ° inclination angle bilateral mode incident, incident light shines on collection face 14 fingers through total reflection in prism 2, the fingerprint image that collects penetrates from exit facet 17 through 15 total reflections of prism 2 reflectings surface, and through image-forming objective lens group 4 disappear distortion, aberration, image on the image receiving plane of picture receiver 6, it is that electric signal outputs to computing machine that picture receiver 6 will receive image transitions.
The present invention is by changing prism structure, adopts the dark field illumination technology and shines in inclination angle bilateral mode, improved picture contrast, enlarged the dynamic range that image gray-scale level changes, and solved the unsharp problem of dried finger imaging; Simultaneously by imaging system to image disappear distortion, aberration, improved the image quality of fingerprint acquisition instrument.
Description of drawings
Fig. 1 is a structural representation of the present invention, also is the specification digest accompanying drawing.Among the figure 1 light source, 2 prisms, 3 housings, 4 image-forming objective lens groups, 5 web members, 6 picture receivers, 14 collection faces, reflecting surface 15, exit facet 17.
Fig. 2 for the A of Fig. 1 of the present invention to view.1 is light source among the figure, 2 prisms, 14 collection faces, the plane of incidence 16.
Fig. 3 is prism 2 of the present invention and image-forming objective lens group 4 index paths, and 2 is prism among the figure, 4 image-forming objective lens groups, and 7 is first optical system, 8 diaphragms, 9 second optical systems, 10 first plano-convex lenss, 11 second plano-convex lenss, 12 the 3rd plano-convex lenss, 13 biconvex lens, 14 collection faces, reflecting surface 15, exit facet 17.
Embodiment
The present invention includes housing 3, light source 1, prism 2, image-forming objective lens group 4, picture receiver 6.Light source 1, prism 2, image-forming objective lens group 4, picture receiver 6 all is fixedly installed in the housing 3; As shown in Figure 1, 2, 3, the present invention adopts dark field illumination, and light source 1 is positioned at prism 2 planes of light incidence 16 outsides, and light source 1 can adopt Vernonia parishii Hook angle light source 1, and as the shinny diode of SMD-LED, the upper surface of prism 2 is a fingerprint collecting face 14.The plane of incidence 16 of light source 1 light has the inclined-plane of an inclination alpha for the both sides, bottom that are positioned at prism 2 and with prism 2 bottoms, and inclination alpha changes according to prism 2 materials are different, and when prism 2 materials were the optical glass of K9, inclination alpha was 8 °.The exit facet 17 of light is the side near image-forming objective lens group 4, and image-forming objective lens group 4 image receiving planes and prism 2 beam projecting faces 17 join in the elasticity pressure mode of mounting, and prism 2 beam projecting faces 17 are vertical with the optical axis of image-forming objective lens group 4; Reflecting surface 15 positions of prism 2 and the exit facet of light 17 relative and with 14 one-tenth 67.5 ° of angles of collection face; Lens barrel is fixed on the circular hole position of housing 3 by fit system; Image-forming objective lens group 4 is fixed in the lens barrel 6, is two telecentric beam path lens imaging systems, comprises first optical system 7, diaphragm 8, the second optical systems 9.The unthreaded hole of diaphragm 8 is positioned at second focus of first optical system 7, the first focus place of second optical system 9.The fingerprint image light of exit facet 17 outgoing is the central hole of diaphragm 8 through second focus that first optical system 7 converges at first optical system 7, become the object point of second optical system 9, and the distortion of removal of images, the effect of diaphragm is that the light that limits by the 7 smooth tool edge outgoing of first optical system passes through diaphragm 8, plays the effect of anaberration; The light that is sent by the object point of second optical system 9 is on the imaging surface that second optical system 9 images in, and second optical system 9 plays the effect that converging ray improves luminous flux.First optical system 7 is made up of first plano-convex lens 10 and second plano-convex lens 11 with optical axis, and first plano-convex lens, 10 convex surfaces and second plano-convex lens, 11 convex surfaces glued joint; First plano-convex lens 10 can adopt the optical glass of K9, and the convex curvature radius is 20mm～68mm; Second plano-convex lens 11 can adopt the optical glass of ZF2, and its convex curvature radius is 10mm～30mm; The aperture of diaphragm 8 is 0.3mm～1.2mm; Second optical system 9 is made up of the 3rd plano-convex lens 12 and biconvex lens 13 with optical axis, and the 3rd plano-convex lens 12 convex surfaces are relative with biconvex lens 13 one of them convex surface; The 3rd plano-convex lens 12 can adopt the optical glass of ZK9, and the convex curvature radius is 5mm～14mm; Biconvex lens 13 can adopt the optical glass of ZF2, and its convex curvature radius is 10mm～30mm.
It is CMOS OV7120 sensor that picture receiver 6 adopts model, is connected with image-forming objective lens group 4 by web member 5, and its image receiving plane is positioned on the imaging surface of image-forming objective lens group 4, and the image information output terminal is connected on the computing machine.
Claims (4)
1. an integrated instrument for collecting intravital fingerprints comprises light source (1), prism (2), and picture receiver (6) is characterized in that also comprising image-forming objective lens group (4); The upper surface of prism (2) is fingerprint collecting face (14), and the plane of incidence (16) of light source (1) light is both sides, bottom that are positioned at prism (2) and the inclined-plane that an inclination alpha is arranged, 0 °＜α≤30 ° bottom prism (2); Light source (1) is positioned at prism (2) plane of light incidence (16) outside; The exit facet of reflection ray (17) is the side near image-forming objective lens group (4), and reflecting surface (15) position of prism (2) is relative with the exit facet (17) of reflection ray; Image-forming objective lens group (4) image receiving plane and prism (2) reflection ray exit facet (17) join; The image receiving plane of picture receiver (6) is positioned on the imaging surface of image-forming objective lens group (4).
2. integrated instrument for collecting intravital fingerprints according to claim 1, reflecting surface (15) position that it is characterized in that prism (2) is relative with the exit facet (17) of light and become 67.5 ° of angles with collection face (14);
3. integrated instrument for collecting intravital fingerprints according to claim 1 is characterized in that image-forming objective lens group (4) comprises first optical system (7), diaphragm (8), second optical system (9); The unthreaded hole of diaphragm (8) is positioned at second focus of first optical system (7), the first focus place of second optical system (9).
4. integrated instrument for collecting intravital fingerprints according to claim 3, it is characterized in that first optical system (7) is made up of first plano-convex lens (10) and second plano-convex lens (11) with optical axis, first plano-convex lens (10) convex surface and second plano-convex lens (11) convex surface glued joint; Second optical system (9) is made up of the 3rd plano-convex lens (12) and biconvex lens (13) with optical axis, and the 3rd plano-convex lens (12) convex surface is relative with one of them convex surface of biconvex lens (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510017227A CN1916937B (en) | 2005-10-28 | 2005-10-28 | Integrated instrument for collecting intravital fingerprints |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510017227A CN1916937B (en) | 2005-10-28 | 2005-10-28 | Integrated instrument for collecting intravital fingerprints |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1916937A CN1916937A (en) | 2007-02-21 |
| CN1916937B true CN1916937B (en) | 2010-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510017227A Expired - Fee Related CN1916937B (en) | 2005-10-28 | 2005-10-28 | Integrated instrument for collecting intravital fingerprints |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1916937B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872362B (en) * | 2017-01-18 | 2023-12-12 | 浙江大学 | LED light source device for visible and near infrared spectrum detection and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2425618Y (en) * | 2000-03-01 | 2001-04-04 | 深圳智同指纹技术有限公司 | Biopsy fingerprint sampler |
| JP2003016432A (en) * | 2001-06-29 | 2003-01-17 | Omron Corp | Fingerprint collating device and prism |
| US20040146188A1 (en) * | 2002-08-06 | 2004-07-29 | Carver John F. | Contoured prism print scanners |
| CN1540572A (en) * | 2003-10-27 | 2004-10-27 | 苏州孔雀信天游电子有限公司 | Optical fingerprint collector |
| CN2845030Y (en) * | 2005-10-28 | 2006-12-06 | 长春方圆光电技术有限责任公司 | Integrated living body finger print acquisition device |
-
2005
- 2005-10-28 CN CN200510017227A patent/CN1916937B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2425618Y (en) * | 2000-03-01 | 2001-04-04 | 深圳智同指纹技术有限公司 | Biopsy fingerprint sampler |
| JP2003016432A (en) * | 2001-06-29 | 2003-01-17 | Omron Corp | Fingerprint collating device and prism |
| US20040146188A1 (en) * | 2002-08-06 | 2004-07-29 | Carver John F. | Contoured prism print scanners |
| CN1540572A (en) * | 2003-10-27 | 2004-10-27 | 苏州孔雀信天游电子有限公司 | Optical fingerprint collector |
| CN2845030Y (en) * | 2005-10-28 | 2006-12-06 | 长春方圆光电技术有限责任公司 | Integrated living body finger print acquisition device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1916937A (en) | 2007-02-21 |
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Granted publication date: 20100526 |