阅读说明：本技术 一种反射成像便携式指纹照相装置 (Portable fingerprint camera device of reflection formation of image ) 是由 陈进 周盛斌 杨奔 张福源 王栋 王毓 黄勤建 王克宇 段坚 王泽龙 杨攀 金 于 2020-06-24 设计创作，主要内容包括：本发明提供了一种反射成像便携式指纹照相装置,其操作方便,体积小,不仅可实现明场和暗场照相,且可减弱甚至消除客体背景图案的干扰,获得质量较高的指纹图像；其包括箱体及开设于所述箱体上的照相孔,所述箱体内设有光源总成、分光镜,所述光源总成包括光源,所述光源发出的光透射过所述分光镜形成照明光路,位于所述照明光路末端的所述箱体上开设有用于照射指纹客体的检材孔,位于所述检材孔处的所述指纹客体被照射后反射的光经所述分光镜反射形成成像光路,所述成像光路上设置具有反光功能的光学元件,所述照相孔设置于经所述光学元件反射后的光路末端的所述箱体上。(The invention provides a reflection imaging portable fingerprint photographic device, which is convenient to operate and small in size, can realize bright field and dark field photography, can weaken and even eliminate the interference of object background patterns, and can obtain fingerprint images with higher quality; it includes the box and sets up in photograph hole on the box, be equipped with light source assembly, spectroscope in the box, light source assembly includes the light source, the light that the light source sent passes through the spectroscope forms the illumination light path, is located illumination light path is terminal offer the material hole of examining that is used for shining the fingerprint object on the box, be located examine material hole department the light of fingerprint object reflection after being shone form the formation of image light path by the spectroscope reflection, the formation of image light path sets up the optical element who has reflection of light function, photograph hole set up in the warp light path after the optical element reflection is terminal on the box.)

1. The utility model provides a portable fingerprint camera device of reflection formation of image, includes the box and sets up in photograph hole on the box, be equipped with light source assembly, spectroscope in the box, light source assembly includes light source, its characterized in that: the light that the light source sent passes through the spectroscope forms the illumination light path, is located illumination light path end offer on the box be used for shining the fingerprint object examine the material hole, be located examine material hole department the light that the fingerprint object was shone the back reflection and is passed through the spectroscope reflection forms the formation of image light path, set up the optical element who has the reflection of light function on the formation of image light path, the photograph hole set up in the warp the light path after the optical element reflection is terminal on the box.

2. A reflection imaging portable fingerprint camera apparatus according to claim 1, wherein: still be equipped with condensing lens, formation of image objective in the box, the condensing lens set up in the light source with between the spectroscope illumination light path, formation of image objective set up in the spectroscope with between the photographic hole the formation of image light path.

3. A reflection imaging portable fingerprint camera apparatus according to claim 2, wherein: the optical distance between the condenser and the light source is the same as the focal length of the condenser, the optical element adopts a first reflective mirror, the imaging objective lens is arranged between the spectroscope and the first reflective mirror, and the spectroscope and the first reflective mirror are arranged at an included angle of 45 degrees with the optical axis of the imaging objective lens.

4. A reflection imaging portable fingerprint camera apparatus as defined in claim 3, wherein: the photographic hole is arranged on the box body right above the first reflective mirror, the material inspection hole is arranged at the bottom of the box body, the spectroscope is arranged right above the material inspection hole, and the condenser lens and the light source are sequentially arranged on the illumination light path above the spectroscope.

5. A reflection imaging portable fingerprint camera apparatus according to claim 1, wherein: the light source assembly further comprises a shell and an adjustable diaphragm, the light source and the adjustable diaphragm are assembled in the shell, the adjustable diaphragm is arranged at the light emitting end of the light source and coaxially arranged with the light source, a diaphragm worm wheel is rotatably connected to the outer wall of the shell, and the diaphragm worm wheel is connected with a handle on the adjustable diaphragm.

6. The reflection imaging portable fingerprint camera device according to claim 5, wherein: and a driving mechanism is arranged in the box body, and the light source assembly is driven by the driving mechanism to enable the light source to move on the focal plane of the condenser lens.

7. The reflection imaging portable fingerprint camera device according to claim 6, wherein: the driving mechanism comprises an assembly fixing frame arranged in the box body, the light source assembly is arranged on the assembly fixing frame, a screw rod penetrates through the assembly fixing frame and is connected with the assembly fixing frame in a rotating mode, two ends of the screw rod are connected with the inner wall of the box body in a rotating mode, a first sliding rod and a second sliding rod penetrate through the assembly fixing frame and then are connected with the inner wall of the box body, the screw rod is connected with a first worm wheel, a first servo motor and a first worm connected with the first servo motor are arranged on the inner wall of the box body, a second servo motor and a second worm connected with the second servo motor are arranged on the assembly fixing frame, the first worm is connected with the first worm wheel in a rotating mode, and the second worm.

8. The portable fingerprint camera device according to any one of claims 5 to 7, wherein: and a second reflecting mirror is further arranged in the box body and arranged on the illumination light path between the light source and the collecting mirror.

9. A reflection imaging portable fingerprint camera apparatus as defined in claim 8, wherein: the second reflective mirror is adjustable in angle through a rotating mechanism.

10. A reflection imaging portable fingerprint camera apparatus as defined in claim 9, wherein: the rotating mechanism comprises a reflector fixing frame, the second reflector is fixed on the reflector fixing frame, the reflector fixing frame is connected with the worm gear II through a reflector rotating shaft, two ends of the reflector rotating shaft are rotatably connected to the inner wall of the box body, the inner wall of the box body is provided with a servo motor III and a worm III connected with the servo motor in a three-phase mode, and the worm III is rotatably connected with the worm gear II.

Technical Field

The invention relates to the technical field of court science, in particular to a portable fingerprint photographic device for reflection imaging.

Background

Photographing is an important link in fingerprint and other trace evidence inspection work, if visible fingerprints and fingerprints processed by a physical or chemical method are found on site or on inspection materials, photographing and recording are carried out as soon as possible so as to prevent the fingerprints from fading or being accidentally damaged; the light distribution photography is that the brightness distribution of the reflected light of the material to be detected is adjusted and controlled by selecting a white light source or a light source with other wavelengths and changing the incidence angle and the direction of the illuminating light, to enhance the contrast between fingerprint lines and the background pattern of the object, reduce or eliminate the interference of the background pattern of the object, among them, the light distribution photography has various methods, and for fingerprints attached to the surface of a smooth impermeable and semipermeable planar object, the most common bright field photography is directed reflection photography, the most common dark field photography is dark field photography, in different sites, the types and conditions of fingerprints and objects thereof are different, different light distribution methods are required to be selected to effectively display fingerprint lines and detail characteristics, however, different light distribution devices are often used singly, for example, a directional reflector device commonly used in fingerprint photography can only be used for directional reflection photography in bright field; the dark field light distribution device can only take a dark field photograph, and in addition, the size of the existing light distribution device and the attached shading parts is large, so that the existing light distribution device is difficult to operate by a single person, and the existing light distribution device is difficult to use due to complicated and changeable environmental conditions such as space, light and the like during field exploration, so that a good effect is difficult to achieve. For a bright field image of a fingerprint obtained by using the directional reflection light distribution device, when the distance between a camera lens and a fingerprint object is long, namely the optical path of an imaging light path is long, the contrast between a fingerprint line and the object background is large, the interference of a background pattern is small, the fingerprint display quality is good, but the device height is high, and the miniaturization is difficult; for dark field photography of fingerprints, a point light source located beside a camera lens is usually adopted for lighting, sometimes reflected bright spots of a light source at the edge of a fingerprint interfere the appearance of fingerprint lines, or the fingerprint presents the condition that one side of the fingerprint line is brighter and the other side of the fingerprint line is darker, and a dark field photography device which has no bright spot interference, uniform line illumination and better contrast is lacked.

Therefore, the light distribution device is integrated into a miniaturized portable device to realize various bright field and dark field photographing of fingerprints, reduce background pattern interference and obtain fingerprint images with high quality, and the light distribution device has very important significance for fixed photographing and extraction of field fingerprints.

Disclosure of Invention

In view of the above problems, the present invention provides a portable fingerprint camera device for reflection imaging, which is convenient to operate and small in size, and can not only realize bright field and dark field photography, but also reduce or even eliminate the interference of object background patterns, and obtain fingerprint images with high quality.

The technical scheme is as follows: the utility model provides a portable fingerprint camera device of reflection formation of image, includes the box and sets up in photograph hole on the box, be equipped with light source assembly, spectroscope in the box, light source assembly includes light source, its characterized in that: the light that the light source sent passes through the spectroscope forms the illumination light path, is located illumination light path end offer on the box be used for shining the fingerprint object examine the material hole, be located examine material hole department the light that the fingerprint object was shone the back reflection and is passed through the spectroscope reflection forms the formation of image light path, set up the optical element who has the reflection of light function on the formation of image light path, the photograph hole set up in the warp the light path after the optical element reflection is terminal on the box.

Furthermore, a condenser lens and an imaging objective lens are arranged in the box body, the condenser lens is arranged on the illumination light path between the light source and the spectroscope, and the imaging objective lens is arranged on the imaging light path between the spectroscope and the photographing hole;

furthermore, the optical distance between the condenser and the light source is the same as the focal length of the condenser, the optical element adopts a first reflective mirror, the imaging objective lens is arranged between the spectroscope and the first reflective mirror, and the spectroscope and the first reflective mirror are arranged at an included angle of 45 degrees with the optical axis of the imaging objective lens;

furthermore, the photographic hole is arranged on the box body right above the first reflective mirror, the material detection hole is arranged at the bottom of the box body, the spectroscope is arranged right above the material detection hole, and the condenser and the light source are sequentially arranged on the illumination light path above the spectroscope;

the light source assembly further comprises a shell and an adjustable diaphragm, the light source and the adjustable diaphragm are both assembled in the shell, the adjustable diaphragm is arranged at the light emitting end of the light source and coaxially arranged with the light source, a diaphragm worm wheel is rotatably connected to the outer wall of the shell, and the diaphragm worm wheel is connected with a handle on the adjustable diaphragm;

furthermore, a driving mechanism is arranged in the box body, and the light source assembly is driven by the driving mechanism to enable the light source to move on the focal plane of the condenser lens;

furthermore, the driving mechanism comprises an assembly fixing frame arranged in the box body, the light source assembly is arranged on the assembly fixing frame, a screw rod penetrates through the assembly fixing frame and is in rotary connection with the assembly fixing frame, two ends of the screw rod are in rotary connection with the inner wall of the box body, a first sliding rod and a second sliding rod both penetrate through the assembly fixing frame and are connected with the inner wall of the box body, the screw rod is connected with a first worm wheel, a first servo motor and a first worm connected with the first servo motor are arranged on the inner wall of the box body, a second servo motor and a second worm connected with the second servo motor are arranged on the assembly fixing frame, the first worm is in rotary connection with the first worm wheel, and the second worm is in rotary connection with the second worm;

further, a second reflecting mirror is arranged in the box body and arranged on the illumination light path between the light source and the collecting mirror;

furthermore, the second reflective mirror is adjustable in angle through a rotating mechanism;

furthermore, the rotating mechanism comprises a reflector fixing frame, the second reflector is fixed on the reflector fixing frame, the reflector fixing frame is connected with the worm gear II through a reflector rotating shaft, two ends of the reflector rotating shaft are rotatably connected to the inner wall of the box body, a servo motor III and a worm III in three-phase connection with the servo motor are mounted on the inner wall of the box body, and the worm III is rotatably connected with the worm gear II.

The invention has the advantages that approximately parallel light is obtained through the matching of the light source assembly and the condenser lens, compared with the traditional directional reflection light distribution method, the total height of the device is greatly reduced, the miniaturization is realized, on the basis, bright field and dark field fingerprint images can be obtained, the fingerprint object can reach the photographic hole after being reflected twice by the spectroscope and the optical element with the light reflection function under the irradiation of the light source, the optical path of an imaging light path is prolonged, the contrast between a fingerprint line and an object background in a bright field directional reflection mode is greatly enhanced, the interference of the object background pattern is weakened or even eliminated, the bright field directional reflection fingerprint image with higher quality can be obtained, and the invention has better use value; in addition, the beam splitter is creatively utilized to reflect and image, so that only one optical element with a light reflecting function is needed to be arranged in an imaging light path, and on the premise of not increasing the total height of the device, enough space can be ensured to be reserved between the optical element and the photographic hole for arranging optical devices with a zooming function, so that the defect that optical zooming times of some cameras are low is overcome, and fingerprint imaging is clearer.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention;

FIG. 2 is a schematic front view of a first embodiment of the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic perspective view of a second embodiment of the present invention;

FIG. 5 is a schematic front view of the second embodiment of the present invention;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is a side sectional view of a light source assembly according to one or more embodiments of the present invention;

FIG. 8 is a front view of a light source assembly according to one or more embodiments of the present invention;

FIG. 9 is a light emission schematic view in bright field directional reflection mode and dark field mode of FIG. 8;

fig. 10 is a view showing illumination in the dark field directional reflection mode of fig. 8.

In fig. 1 to 10: 1. a box body; 2. a light source assembly; 3. a beam splitter; 4. a condenser lens; 5. an imaging objective lens; 6. a first reflective mirror; 7. material checking holes; 8. a photo hole; 9. a second reflective mirror; 10. a housing; 11. a light source; 12. an adjustable diaphragm; 13. a handle; 14. a blade; 15. a diaphragm worm gear; 16. an assembly mount; 17. a screw; 18. a first worm wheel; 19. a first servo motor; 20. a first worm; 21. a servo motor II; 22. a second worm; 23. a mirror holder; 24. a second worm gear; 25. a servo motor III; 26. a worm III; 27. a mirror rotating shaft; 28. a central light source; 29. a peripheral light source; 30. a first sliding rod; 31. and a second sliding rod.

Detailed Description