CN203463989U - Laser uniform illumination device for fingerprint optical development system - Google Patents
Laser uniform illumination device for fingerprint optical development system Download PDFInfo
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- CN203463989U CN203463989U CN201320504615.9U CN201320504615U CN203463989U CN 203463989 U CN203463989 U CN 203463989U CN 201320504615 U CN201320504615 U CN 201320504615U CN 203463989 U CN203463989 U CN 203463989U
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Abstract
The utility model relates to a laser uniform illumination device for a fingerprint optical development system. The laser uniform illumination device comprises an ultraviolet solid laser, wherein a confocal beam expander set, an ultraviolet liquid core optical fiber and a collimating lens are sequentially arranged along the output beam direction of the ultraviolet solid laser, and the output end of the ultraviolet liquid core optical fiber is positioned on a front focal point of the collimating lens. The laser uniform illumination device provided by the utility model can provide monochrome and uniform illumination excitation conditions required by fingerprint optical development, and can keep uniform light intensity distribution on a section of any one illumination position in a range of certain distance and the incidence angle of light beam transmission, and has the characteristics of low loss, high brightness, simple structure, and flexibility and convenience in operation and use.
Description
Technical field
The utility model relates to finger mark optics and manifests system, particularly a kind of finger mark optics manifests the laser uniform illumination device of system, can realize finger mark optics and manifest lighting condition required in testing process, the uniformity that comprises lighting source distance, incident angle, light distribution, and can, in required illumination distances and incident angle excursion, realize the even light distribution of lighting source.
Background technology
Finger mark optics manifest system be for finger mark material evidence particularly potential finger mark manifest a kind of important means of extraction.In this technology, adopt various specific light sources, utilize finger mark to leave over special absorption, reflection, scattering and fluorescent characteristic that material composition has under various light source activations, the pattern and other details that weaken or eliminate in finger mark background are disturbed, increase the luminance contrast of finger mark streakline and background, thereby finger mark is displayed, there is fast, can't harm, do not affect the feature that follow-up process for show is used.At this optics, manifest in system, lighting source and illumination stimulation effect thereof, the optics of finger mark is manifested to effect to the uniformity of particularly throwing light on and verification and measurement ratio has important impact.
At finger mark optics, manifest exciting in lighting process of system, the high-power, multiband light sources (xenon lamp, halogen tungsten lamp or LED light source) that adopt as exciting lighting source (referring to technology: Yao Shaokuan formerly more, Liao Yang, Tang Chang, Zhai Luping is published in criminal technique, 2010, (3): the paper of 49～50 pages), utilize optical filter or grating to realize the required selection output that excites illumination band of light.Or adopt diode pumped solid state laser for exciting lighting source, Output of laser light beam is directly (referring to technology formerly: a kind of manifesting, extract method and the device thereof of on-the-spot potential finger mark, China Patent No. 201110057239.9, inventor Cai can be refined, Sun Wending, Deng Nan, Huang Xiaochun), or through optical lens group (referring to technology formerly: the solid laser finger-print of portable semiconductor laser pumping manifests instrument, China Patent No. 95109209.X, inventor Liao Jiang is red, Jin Tianfeng, Wang Xiaoping, Tan Huiming, Chang Bainian, Liu Huan) leaded light transmission, realize the illumination that excites of tested finger mark sample.
Mainly there is following deficiency in above-mentioned existing method:
1, adopt alternative light source for illumination excitation source, actual utilizable monochromatic light power is little, cannot effectively meet required the exciting and lighting condition of faint fluorescent material composition; And beam divergence is strong, increased the danger of light radiation.
2, adopt light source output beam directly or excite illumination through optical lens transmission, high to optical path adjusting specification requirement, complicated operation.Utilize this technology to realize the required illumination shooting condition of sample, need carry out fine adjustment to the position between light source and optical element and angle, specification requirement is high, and sample can be examined region and illuminating effect strictly depends on the position of optical lens and the degree of regulation of light path.
3, the light distribution of illuminating bundle is inhomogeneous, cannot meet complete effective enhancing or manifest the required lighting demand of finger mark image.
Summary of the invention
The purpose of this utility model is to overcome the deficiency of above-mentioned formerly technology, provide a kind of finger mark optics to manifest the laser uniform illumination device of system, this device can produce finger mark optics and manifest required monochrome, Uniform Illumination shooting condition, can within the scope of beam Propagation certain distance scope and incident angle, on arbitrary lighting position cross section, keep even light distribution, and it is little to have loss, brightness is high, simple in structure, operates feature flexible and convenient to use.
Technical solution of the present utility model is as follows:
A kind of finger mark optics manifests the laser uniform illumination device of system, its feature is to comprise ultraviolet solid-state laser, along in this ultraviolet solid-state laser output beam direction, be confocal beam expanding lens group, ultraviolet liquid-core optical fiber and collimation lens successively, the output of described ultraviolet liquid-core optical fiber is positioned at the front focus of collimation lens.
Described ultraviolet solid-state laser is that centre wavelength is the ultraviolet laser that monochromaticjty is good, brightness is high that 266nm, mean power are greater than 100mW.
Described confocal beam expanding lens group is by first lens, the second lens, first lens trim ring, the second lens trim ring, lock-screw, the first lens barrel and the second lens barrel form, the focal length of described first lens is less than the focal length of the second lens, first lens is fixed on the input of the first lens barrel by first lens trim ring, the second lens are fixed on the output of the second lens barrel by the second lens trim ring, the input of the second lens barrel inserts the output of the first described lens barrel, regulate the position of the second lens, after guaranteeing that the back focus of first lens and the second lens front focus coincide, chute by lock-screw through the first described lens barrel output locks the second described lens barrel.
The proportion of the focal length of the focal length of described first lens and the second lens is 1:2～1:10.
Described collimation lens is fixed in lens barrel by trim ring, and the front port of this lens barrel and described ultraviolet liquid-core optical fiber output are of coupled connections, and guarantees that described ultraviolet liquid-core optical fiber output is positioned at the focal plane of described collimation lens.
Described ultraviolet liquid-core optical fiber, for transmission and the homogenizer of the required laser beam that throws light on, has the flexibility of certain curvature radius.
Described collimation lens is exported for the collimation of light beam, and is connected with liquid-core optical fibre output, can be with fiber-optic output integrated moving.
Compare with technology formerly, the utility model has following advantage:
1, laser instrument is as lighting source, and luminous power utilization rate is high, and loss is little, and brightness is large, and monochromaticjty is good, can meet the required illumination of faint material imaging and shooting condition.
2, adopt liquid-core optical fibre as beam Propagation and even element, simple in structure, be easy to debug, easy to operate, use flexibly.
3, adopt collimation lens and be connected with fiber-optic output, the transmission of output beam collimation and direction can change with fibre-optical bending, adjustable flexibly, meet the light intensity on arbitrary lighting position cross section within the scope of beam Propagation certain distance scope and incident angle and are uniformly distributed.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model finger mark optics manifests the laser uniform illumination device of system
Fig. 2 is the confocal beam expanding lens group of the utility model structural representation
Fig. 3 is the structural representation that the utility model collimation lens is connected with ultraviolet liquid-core optical fiber output
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail, but should limit protection domain of the present utility model with this.
Please first consult Fig. 1, Fig. 1 is the structural representation that the utility model finger mark optics manifests the laser uniform illumination device of system.As seen from the figure, the utility model finger mark optics manifests the laser uniform illumination device of system, solid state laser 1, confocal beam expanding lens group 2, ultraviolet liquid-core optical fiber 3 and collimation lens 4, consists of.In the solid state laser 1 output beam direction along described, set gradually confocal beam expanding lens group 2, ultraviolet liquid-core optical fiber 3 and collimation lens 4 that bending radius is adjustable, described confocal beam expanding lens group 2 two ends are connected with output and liquid-core optical fibre 3 inputs of solid state laser 1 respectively, and the output of described liquid-core optical fibre 3 is positioned at the front focus of collimation lens 4.
Described solid state laser 1 is ultraviolet laser, export required ultraviolet band 266nm laser beam, through confocal beam expanding lens group 2, focus on and expand, coupling is incident in ultraviolet liquid-core optical fiber 3, through ultraviolet liquid-core optical fiber 3, carry out homogenizer and leaded light transmission, collimation lens 4 collimations, the light intensity realizing within the scope of certain distance scope and incident angle is uniformly distributed illumination.
Described ultraviolet solid-state laser 1, the centre wavelength 266nm of output, full width at half maximum (FWHM) 6nm, mean power are greater than the laser beam that monochromaticjty is good, brightness is high of 100mW.
Described confocal beam expanding lens group 2, refers to structure chart 2, first lens 21, the second lens 22, first lens trim ring 211, the second lens trim ring 223, chute 222, lock-screw 221, first lens lens barrel 212 and the second lens barrel 224, consists of.First lens 21 back focuses and the second lens 22 front focus coincide, and the focal length of first lens 21 is less than the focal length of the second lens 22, and the two focal length relation depends on laser beam and liquid-core optical fibre core diameter parameter; First lens 21 is fixed on the input of the first lens barrel 212 by first lens trim ring 211, keep motionless, and the second lens 22, by the second lens trim ring 223, are fixed on the output of the second lens barrel 224; The input of the second lens barrel 224 inserts the output of the first described lens barrel 212, described lock-screw 221 locks the second described lens barrel 224 through the chute 222 of the first described lens barrel 212, the second described lens 22 can be with the second lens barrel 224, at one times of focal position place, along optical axis direction, unscrew after described screw 221, along chute 222 front and back, slightly move to desired location, and by screw 221 spin lockings.According to solid state laser 1 Output of laser beam sizes, liquid-core optical fibre 3 core diameters and numerical aperture, select beam expanding lens group 2 to expand multiplying power and the angle of divergence, after expanding, laser beam is full of liquid-core optical fibre 3 incident end face core diameters.First lens 21 and the second lens 22 material adopting quartz glass, and according to expand ratio-dependent first lens 21 and the second lens 22 focal distance f and between position.
Described UV transparent liquid-core optical fibre 3, excites the transmission of required 266nm laser beam and equalization of intensity to improve for throwing light on.Through beam expanding lens group 2, expand laser beam, vertical incidence UV transparent liquid-core optical fibre 3 within the scope of certain incident angle.Described ultraviolet liquid-core optical fiber, its feature is that numerical aperture is large, and coupling efficiency is high, and ultraviolet light wave band efficiency of transmission is high, and optical power loss is little.Incident ray within the scope of described ultraviolet liquid-core optical fiber 3 numerical aperture predetermined angulars, at core liquid and covering interface, there is multiple total reflection, the part that light beam different light intensity distributes, after multiple reflections complex superposition, transmission, realizing light beam light intensity is uniformly distributed, by fiber-optic output outgoing, and directional light transmission after collimation lens 4.
Described collimation lens 4 is for the be evenly distributed collimation transmission of light beam of liquid-core optical fibre 3 output intensities.The focal distance f of this collimation lens 4 can be according to the scope of the numerical aperture of liquid-core optical fibre 3, core diameter and required Uniform Illumination, utilize method of geometrical optics calculative determination, described collimation lens 4 is fixed in lens barrel 42 by trim ring 41, the front port of this lens barrel 42 and described ultraviolet liquid-core optical fiber 3 outputs are of coupled connections, can be with ultraviolet liquid-core optical fiber output integrated moving, the light intensity realizing within the scope of required separation distance scope and incident angle is uniformly distributed illumination.
Concrete structure and the parameter of specific embodiment of the utility model are as follows:
Laser instrument 1 is ultraviolet solid-state laser, centre wavelength 266nm, repetition rate 1KHz, outgoing beam spot diameter 0.5mm, power output 180mW.Ultraviolet liquid-core optical fiber, model S250, core diameter 3mm, numerical aperture 0.42.According to laser beam spot size and liquid-core optical fibre parameter, focusing beam expanding lens group expands multiplying power and is chosen as 5 times, wherein the focal length of first lens 21 is f=10mm, the focal length of the second lens 22 is f=50mm, first lens is connected with the input of ultraviolet solid-state laser 1 and ultraviolet liquid-core optical fiber respectively by mechanical optics lens barrel with the second lens, lens barrel overall length 100mm, first lens position is fixed, distance lasers output 10mm, the second lens can move along optical axis direction, apart from the position-movable scope 35～85mm of first lens.According to Uniform Illumination scope D=45mm and liquid-core optical fibre parameter, the focal distance f of collimation lens 4 is 45mm by geometric optical theory calculative determination.Apply this laser uniform illumination device, realize finger mark optics and manifested required Uniform Illumination shooting condition, in illumination sample 300mm excursion and 45 ° of ranges of incidence angles, illuminating bundle light distribution is even, uniform light spots Top-hat factor can reach F=0.815, met finger mark optics and manifested the required illumination of system and shooting condition, the optical enhancement that can realize finger mark image manifests.
Claims (5)
1. a finger mark optics manifests the laser uniform illumination device of system, it is characterized in that comprising ultraviolet solid-state laser (1), along in this ultraviolet solid-state laser (1) output beam direction, be confocal beam expanding lens group (2), ultraviolet liquid-core optical fiber (3) and collimation lens (4) successively, the output of described ultraviolet liquid-core optical fiber (3) is positioned at the front focus of collimation lens (4).
2. finger mark optics according to claim 1 manifests the laser uniform illumination device of system, it is characterized in that described ultraviolet solid-state laser (1) is that centre wavelength is the ultraviolet laser that monochromaticjty is good, brightness is high that 266nm, mean power are greater than 100mW.
3. finger mark optics according to claim 1 manifests the laser uniform illumination device of system, it is characterized in that described confocal beam expanding lens group (2) is by first lens (21), the second lens (22), first lens trim ring (211), the second lens trim ring (223), lock-screw (221), the first lens barrel (212) and the second lens barrel (224) form, the focal length of described first lens (21) is less than the focal length of the second lens (22), first lens (21) is fixed on the input of the first lens barrel (212) by first lens trim ring (211), the second lens (22) are fixed on the output of the second lens barrel (224) by the second lens trim ring (223), the input of the second lens barrel (224) inserts the output of described the first lens barrel (212), regulate the position of the second lens (22), after guaranteeing that the back focus of first lens (21) and the second lens (22) front focus coincide, chute (222) by lock-screw (221) through described the first lens barrel (212) output locks described the second lens barrel (224).
4. finger mark optics according to claim 3 manifests the laser uniform illumination device of system, it is characterized in that the described focal length of first lens (21) and the proportion of the focal length of the second lens (22) are 1:2～1:10.
5. finger mark optics according to claim 3 manifests the laser uniform illumination device of system, it is characterized in that described collimation lens (4) is fixed in lens barrel (42) by trim ring (41), the front port of this lens barrel (42) and described ultraviolet liquid-core optical fiber (3) output are of coupled connections, and guarantee that described ultraviolet liquid-core optical fiber (3) output is positioned at the focal plane of described collimation lens (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320504615.9U CN203463989U (en) | 2013-08-16 | 2013-08-16 | Laser uniform illumination device for fingerprint optical development system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320504615.9U CN203463989U (en) | 2013-08-16 | 2013-08-16 | Laser uniform illumination device for fingerprint optical development system |
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| CN203463989U true CN203463989U (en) | 2014-03-05 |
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| CN201320504615.9U Expired - Fee Related CN203463989U (en) | 2013-08-16 | 2013-08-16 | Laser uniform illumination device for fingerprint optical development system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398314A (en) * | 2013-08-16 | 2013-11-20 | 上海海潮新技术研究所 | Laser uniform illumination device of fingerprint optical emerging system |
| CN117590521A (en) * | 2024-01-18 | 2024-02-23 | 北京镭科光电科技有限公司 | Semiconductor laser coupling transmission imaging device and equipment using liquid core light guide pipe |
-
2013
- 2013-08-16 CN CN201320504615.9U patent/CN203463989U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398314A (en) * | 2013-08-16 | 2013-11-20 | 上海海潮新技术研究所 | Laser uniform illumination device of fingerprint optical emerging system |
| CN117590521A (en) * | 2024-01-18 | 2024-02-23 | 北京镭科光电科技有限公司 | Semiconductor laser coupling transmission imaging device and equipment using liquid core light guide pipe |
| CN117590521B (en) * | 2024-01-18 | 2024-03-19 | 北京镭科光电科技有限公司 | Semiconductor laser coupling transmission imaging device and equipment using liquid core light guide pipe |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140305 Termination date: 20140816 |
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| EXPY | Termination of patent right or utility model |