CN1141063C - Fingerprint identifying optical system with wide view field and no distortion - Google Patents
Fingerprint identifying optical system with wide view field and no distortion Download PDFInfo
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- CN1141063C CN1141063C CNB981153399A CN98115339A CN1141063C CN 1141063 C CN1141063 C CN 1141063C CN B981153399 A CNB981153399 A CN B981153399A CN 98115339 A CN98115339 A CN 98115339A CN 1141063 C CN1141063 C CN 1141063C
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- forming objective
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Abstract
The present invention relates to a fingerprint identification shooting optical system with stereo optical paths, which belongs to the field of optical technology. The present invention solves the problems that the size a large-field imaging objective lens is too large because of the arrangement of planar optical paths; fingerprint images generated by the ordinary imaging objective lens have the problem of keystone distortion and image surface out-of-focus. The present invention is composed of prisms 1 and 2, an imaging objective lens 3, a light source 4, a shooting system 5, a covering plate 6, a bracket 7, a reflector 8 and a cabinet 9. The adoption of the stereo optical paths corrects the aspect ratio of the fingerprint images, reduces the caliber of the entire optical beam by 0.7 time, greatly reduces the size of the optical system and reduces cost; the adoption of a telecentric optical path imaging objective lens makes the fingerprint images have no keystone distortion and have high imaging quality. The present invention is suitable for fingerprint identification of public security departments, and can be used for manufacturing fingerprint locks, etc.
Description
The invention belongs to optical technical field, relate to the fingerprint recognition image pickup optical system that adopts stereo optical path.
Prior art as shown in Figure 1, it comprises: light source 4, diffuse reflector 6, adopt to proofread and correct the optical system that both buses of prism 1 and 45 ° of input prisms 2 are parallel to each other, proofread and correct prism 1 the arrow beam of light expansion is restrainted into 1.412 times, therefore the imaging optical system bore is big, and, then can not proofread and correct trapezoidal distortion because imaging optical system 3 does not adopt telecentric beam path.In order to proofread and correct trapezoidal distortion, suitably tilt to make trapezoidal distortion to reduce usually video camera 5 target surfaces, at this moment produce the imaging surface out of focus inevitably, extra-axial imagery downgrade, the therefore effect that can only obtain trading off.The situation that this scheme is less to the visual field can satisfy instructions for use basically.But to requiring big visual field, high-quality system, it can not satisfy instructions for use.The optical axis of whole system (in paper) in a plane is arranged.
The objective of the invention is design, develop big visual field, undistorted, high-quality fingerprint recognition image pickup optical system, overcome because light path adopts horizontal layout, and make big view field imaging object lens oversize, and overcome problems such as general image-forming objective lens generation trapezoidal distortion and image planes out of focus.This big visual field of rolling collection fingerprint recognition image pickup optical system that public security is used is very important.
The present invention is shown in Fig. 2,3,4: it is made up of correction prism 1, input prism 2, image-forming objective lens 3, light source 4, camera system 5, cover plate 6, support 7, reflecting mirror 8, casing 9.Be characterized in: fixed in position is proofreaied and correct prism 1 on support 7, input prism 2, image-forming objective lens 3, light source 4, camera system 5, reflecting mirror 8, and the light-emitting area of light source 4 is parallel with the right angle face of input prism 2 and angled with the input inclined-plane of input prism 2, the optical axis of image-forming objective lens 3 is angled with the normal on the input inclined-plane of input prism 2, the inclined-plane normal of correction prism 1 and the optical axis of image-forming objective lens 3 are angled, the bus of proofreading and correct prism 1 is vertical with the optical axis of image-forming objective lens 3, and proofread and correct the bus vertical placement mutually of bus with the input prism 2 of prism 1, arrangement plane mirror 8 links the optical axis of correction prism 1 outgoing beam and the optical axis of image-forming objective lens 3 between prism 1 and the image-forming objective lens 3 proofreading and correct, cover plate 6 is fixedly mounted on the casing 9 and places on the input inclined-plane of input prism 2, and support 7 is fixedly connected with casing 9.Image-forming objective lens 3 is made up of preceding group of lens 10, back group lens 11 and aperture diaphragm 12, and the back focal plane of group lens 10 overlaps with the front focal plane of back group lens 11 before being characterized in, and places aperture diaphragm 12 on coincidence face, forms the telecentric beam path image-forming objective lens.
When light source 4 uniform irradiations are on the fingerprint input inclined-plane of input prism 2, on the fingerprint input inclined-plane of input prism 2, put fingerprint, imaging light is through proofreading and correct prism 1, reflecting mirror 8 and image-forming objective lens 3, fingerprint image is imaged on the camera system 5, feeds computer by the signal of camera system 5 output and carry out fingerprint image identification.
Good effect of the present invention: in order to proofread and correct the aspect ratio of fingerprint image, adopted because the vertical mutually stereo optical path that promptly forms of bus of prism 1 and prism 2, solved the big problem of system dimension, it dwindles 0.7 times (prior art is amplified 1.4142 times to arrow beam of light) to angle pencil of ray, when proofreading and correct aspect ratio, again the bore of whole light beam has been dwindled 0.7 times like this, the optical system size is significantly reduced, reduced cost, bring great convenience for the design of big view field imaging object lens.The present invention also adopts the imaging optical system of telecentric beam path, make its chief ray object space all parallel with optical axis with picture side, therefore its enlargement ratio and object distance are irrelevant, there is not trapezoidal distortion, because there is not the out of focus problem in imaging surface, and make the image quality height, reach the requirement of big visual field, undistorted, high-quality fingerprint recognition camera system.
Fig. 1 is the optical planar circuit sketch map of prior art.
Fig. 2 is a stereo optical path sketch map of the present invention.
Fig. 3 is a structure side view of the present invention.
Fig. 4 is that the A of Fig. 3 of the present invention is to view.
Embodiments of the invention: prism 1 and 2 adopts optical glass material or plastics to make, and object lens 3 adopt optical glass to make.Light source 4 is used light emitting diode matrix.Camera system 5 is selected the area array CCD shooting according to market situation.Cover plate 6, support 7, casing 9 usefulness aluminum or plastics are made.Reflecting mirror 8 adopts plane mirror and becomes with the optics glass.Prism 1 and prism 2 can be to make a plane of incidence and an exit facet on a block of material, also can be vertically glued together mutually two prismatical buses, and also can separate two prisms and use.Prism 2 can be selected the corner cube prism about 45 ° for use, its inclined-plane is the input face of contact fingerprint, proofreading and correct the acute angle of prism 1 can select for use about 30 °, its bus is vertical mutually with the bus of prism 2, proofread and correct the right angle face of prism 1 acute angle and the right angle face gummed of prism 2, calibrated prism 1 dwindles into the light beam of horizontal direction with the light beam of vertical direction and equates.Image-forming objective lens 3 adopts 4-6 sheet lens to form, and the fingerprint input face of prism 2 is imaged on CCD camera system 5 target surfaces, and CCD camera system 5 output signals are sent into computer by image card, by computer identification fingerprint.The direction of arrow shown in Figure 2 is expressed as systematic optical axis, does not then arrange for stereo optical path in a plane with systematic optical axis.Image-forming objective lens 3 usefulness 4-6 piece lens are formed object space and telecentric beam path in image space, and promptly the chief ray of object space and picture side is parallel with optical axis, and the amplification of imaging and object distance are irrelevant like this, reach the purpose of proofreading and correct trapezoidal distortion.In order to realize the imaging of object space and picture side, image-forming objective lens 3 its aperture diaphragms 12 will be located at the centre of this image-forming objective lens 3, and this aperture diaphragm 12 must be in the back focus position of this object lens first half, simultaneously also on the front focus position of this object lens latter half.Fingerprint identifying optical system with wide view field and no distortion of the present invention is imported prismatical input face and is of a size of 40 * 40mm
2, ccd video camera has adopted 1/3 inch B.The sample point density of fingerprint image is 500dpi, is used to the fingerprint acquisition system that rolls.
Claims (2)
1, a kind of fingerprint identifying optical system with wide view field and no distortion, it comprises proofreaies and correct prism (1), input prism (2), image-forming objective lens (3), light source (4), camera system (5), it is characterized in that: go up fixed in position at support (7) and proofread and correct prism (1), input prism (2) image-forming objective lens (3), light source (4), camera system (5), reflecting mirror (8), and the light-emitting area of light source (4) is parallel with the right angle face of input prism (2) and angled with the input inclined-plane of input prism (2), the optical axis of image-forming objective lens (3) is angled with the normal on the input inclined-plane of input prism (2), the inclined-plane normal of correction prism (1) and the optical axis of image-forming objective lens (3) are angled, the bus of proofreading and correct prism (1) is vertical with the optical axis of image-forming objective lens (3), and proofread and correct prism (1) bus and the mutual vertical placement of the bus of input prism (2), link at the optical axis of proofreading and correct the outgoing beam of settling plane mirror (8) to make correction prism (1) between prism (1) and the image-forming objective lens (3) and the optical axis of image-forming objective lens (3), the casing (9) that is fixedly mounted on cover plate (6) goes up and places on the input inclined-plane of input prism (2), and support (7) is fixedly connected with casing (9).
2, fingerprint identifying optical system with wide view field and no distortion according to claim 1, it is characterized in that: image-forming objective lens (3) is made up of preceding group of lens (10), back group lens (11) and aperture diaphragm (12), the back focal plane of preceding group lens (10) overlaps with the front focal plane of back group lens (11), and places aperture diaphragm (12) on coincidence face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981153399A CN1141063C (en) | 1998-06-18 | 1998-06-18 | Fingerprint identifying optical system with wide view field and no distortion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981153399A CN1141063C (en) | 1998-06-18 | 1998-06-18 | Fingerprint identifying optical system with wide view field and no distortion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1267503A CN1267503A (en) | 2000-09-27 |
| CN1141063C true CN1141063C (en) | 2004-03-10 |
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ID=5224520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981153399A Expired - Fee Related CN1141063C (en) | 1998-06-18 | 1998-06-18 | Fingerprint identifying optical system with wide view field and no distortion |
Country Status (1)
| Country | Link |
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| CN (1) | CN1141063C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4507806B2 (en) * | 2004-10-01 | 2010-07-21 | 三菱電機株式会社 | Fingerprint image pickup device |
| CN101290465B (en) | 2007-04-20 | 2010-06-02 | 鸿富锦精密工业（深圳）有限公司 | Lens module with fingerprint identification function and corresponding portable electronic device |
| CN102880867B (en) * | 2011-09-06 | 2015-10-28 | 友尼嗯可缪尼体有限公司 | Optical fingerprint acquisition apparatus |
| CN107655812A (en) * | 2013-12-18 | 2018-02-02 | 香港科技大学 | Method, system and the prismatic light chip device of deep layer cells super-resolution imaging |
| CN103955686A (en) * | 2014-05-15 | 2014-07-30 | 浙江师大计海新技术有限公司 | Palm print collecting instrument |
| CN109791612B (en) * | 2018-12-26 | 2023-08-08 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN113534400B (en) * | 2021-06-29 | 2023-03-14 | 西安航天精密机电研究所 | Prism assembly and assembling method thereof |
-
1998
- 1998-06-18 CN CNB981153399A patent/CN1141063C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1267503A (en) | 2000-09-27 |
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Owner name: CHANGCHUN OPTOELECTRONIC TECHNOLOGY AREA OF LIMIT Free format text: FORMER OWNER: CHANGCHUN OPTICAL AND PRECISE MACHINERY INST., CHINESE ACADEMY OF SCIENCE Effective date: 20071221 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20071221 Address after: No. 19, Yingkou Road, Changchun economic and Technological Development Zone, Jilin, China Patentee after: Fangyuan Photoelectric Tech Co., Ltd., Changchun Address before: No. 140 Renmin Street, Jilin, Changchun Patentee before: Optical Precision Nachinery, Inst, Changchun Chinese Academy of Sciences |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040310 Termination date: 20160618 |
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| CF01 | Termination of patent right due to non-payment of annual fee |