CN2335156Y - Wide viewing field distortionless fingerprint identifying optical system - Google Patents
Wide viewing field distortionless fingerprint identifying optical system Download PDFInfo
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- CN2335156Y CN2335156Y CN 98215867 CN98215867U CN2335156Y CN 2335156 Y CN2335156 Y CN 2335156Y CN 98215867 CN98215867 CN 98215867 CN 98215867 U CN98215867 U CN 98215867U CN 2335156 Y CN2335156 Y CN 2335156Y
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- forming objective
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Abstract
The utility model relates to a fingerprint identifying camera optical system, belonging to an optical technical field. A fingerprint identifying optical system with wide view field and no distortion is composed of prisms 1 2, an imaging objective lens 3, a light source 4, a camera system 5, a cover plate 6, a support frame 7, a reflecting mirror 8 and a casing 9. A stereo optical path is used to correct the aspect ratio of a fingerprint image, and simultaneously the caliber of the whole light beam reduces 0.7 times to make the size of the optical system reduced; the cost is lowered, a far center light path imaging objective lens is used to make the fingerprint image not have trapezoidal distortion, and the imaging quality is high. The utility model is suitable for the fingerprint identification in 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), the optical system that adopts correction prism (1) and both buses of 45 ° of input prisms (2) to be 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 surface, at this moment produce the imaging surface out of focus inevitably, the extra-axial imagery quality descends, therefore the effect that can only obtain trading off.The situation that this scheme is less to the visual field can satisfy request for utilization basically.But to requiring big visual field, high-quality system, it can not satisfy request for utilization.The optical axis of total 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 floor plan, 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), catoptron (8), casing (9).Be characterized in: 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), catoptron (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), between correction prism (1) and image-forming objective lens (3), settle plane mirror (8) that the optical axis of correction prism (1) outgoing beam and the optical axis of image-forming objective lens (3) are linked, cover plate (6) is fixedly mounted on casing (9) and goes up and place 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), the back focal plane of group lens (10) overlaps with the front focal plane of back group lens (11) before being characterized in, and on coincidence face, place aperture diaphragm (12), form the telecentric beam path image-forming objective lens.
When on the fingerprint input inclined-plane of light source (4) uniform irradiation at input prism (2), on the fingerprint input inclined-plane of input prism (2), put fingerprint, imaging light is through proofreading and correct prism (1), catoptron (8) and image-forming objective lens (3), fingerprint image is imaged on the camera system (5), feeds computing machine 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 synoptic diagram of prior art.
Fig. 2 is a stereo optical path synoptic diagram 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) adopt 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) are made with aluminium or plastics.Catoptron (8) adopts plane mirror and becomes with the optics glass.Prism (1) and prism (2) they can be to make a plane of incidence and an exit facet on a block of material, also can be vertically glued together mutually the bus of two prisms, and also can separate two prisms and use.Prism (2) can be selected the right-angle 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 surface, and CCD camera system (5) output signal is sent into computing machine by image card, by the computer Recognition 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) is formed object space and telecentric beam path in image space with 4-6 piece lens, and promptly the chief ray of object space and picture side is parallel with optical axis, and the magnification of imaging and object distance are irrelevant like this, reaches the purpose of proofreading and correct trapezoidal distortion.In order to realize the imaging of object space and picture side, its aperture diaphragm of image-forming objective lens (3) (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.The input face of fingerprint identifying optical system with wide view field and no distortion input prism of the present invention is of a size of 40 * 40mm
2, ccd video camera has adopted 1/3 inch B.The sampling spot 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), catoptron (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), cover plate (6) is fixedly mounted on casing (9) and goes up and place 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 |
|---|---|---|---|
| CN 98215867 CN2335156Y (en) | 1998-06-18 | 1998-06-18 | Wide viewing field distortionless fingerprint identifying optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98215867 CN2335156Y (en) | 1998-06-18 | 1998-06-18 | Wide viewing field distortionless fingerprint identifying optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2335156Y true CN2335156Y (en) | 1999-08-25 |
Family
ID=33969015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98215867 Expired - Fee Related CN2335156Y (en) | 1998-06-18 | 1998-06-18 | Wide viewing field distortionless fingerprint identifying optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2335156Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641406B (en) * | 2004-01-15 | 2012-09-26 | 长春方圆光电技术有限责任公司 | Large view field distortion-free palm print collecting system |
-
1998
- 1998-06-18 CN CN 98215867 patent/CN2335156Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641406B (en) * | 2004-01-15 | 2012-09-26 | 长春方圆光电技术有限责任公司 | Large view field distortion-free palm print collecting system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |