CN218767765U - Horizontal multi-stage reflection spectroscope reflection imaging portable fingerprint photographic device - Google Patents

Abstract

The utility model provides a portable fingerprint camera device of spectroscope reflection formation of image of horizontal direction multistage reflection can further increase the optical distance of formation of image light path and reduce the volume, obtains the fingerprint image that the quality is higher, has better portability and ease for use; the box body is internally provided with a light source assembly and a spectroscope, the light source assembly comprises a light source, the box body is provided with a photographic hole and a material detecting hole, light emitted by the light source transmits through the spectroscope to form an illumination light path, the illumination light path also comprises a first reflector, and the light transmitted through the spectroscope is reflected to the material detecting hole at the tail end of the illumination light path through the first reflector; the light reflected by the irradiated fingerprint object at the position of the material detecting hole is reflected by the first reflector and the beam splitter to form an imaging light path, the formed imaging light path is reflected to the camera hole at the tail end of the imaging light path through the second reflector and the third reflector, and the light path from the light source to the first reflector and the light path from the first reflector to the third reflector are both positioned in the horizontal direction.

Description

Horizontal multi-stage reflection spectroscope reflection imaging portable fingerprint photographic device

Technical Field

The utility model relates to a court science technical field specifically is portable fingerprint camera device of spectroscope reflection formation of image of horizontal direction multistage reflection.

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 to select a white light source or a light source with other wavelengths, adjust and control the brightness distribution of reflected light of a material to be detected by changing the incident angle and the direction of illumination light, so as to enhance the contrast between fingerprint lines and an object background pattern and weaken or eliminate the interference of the object background pattern, wherein, the light distribution photography has various methods, for fingerprints attached to the surface of smooth impermeable and semipermeable plane objects, the most common bright field photography is directed reflection photography, the most common dark field photography is dark field photography, and in different sites, the types and conditions of the fingerprints and the objects thereof are different, and different light distribution methods are required to be selected to effectively show the fingerprint lines and the detailed characteristics, but different light distribution devices are usually single in use, for example, the common directional reflector device in the fingerprint photography can only be used for the directed reflection photography of the 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 camera lens is far away from a fingerprint object, namely the optical path of an imaging light path is long, the contrast between fingerprint lines and the object background is large, the interference of background patterns is small, the fingerprint display quality is good, but the device height must be high, and the miniaturization is difficult.

To solve the above problems, the prior patent nos.: ZL202021197355.1, name: a reflection imaging portable fingerprint camera apparatus which can integrate a light distribution device into a small-sized portable apparatus, the reduction in size and height of which enable the apparatus to be small-sized as compared with conventional apparatuses, but there is room for improvement in that: the light path of the imaging light path is increased so as to obtain better quality fingerprint images, and meanwhile, the volume is further reduced, particularly the height is reduced so as to obtain better portability and usability.

Disclosure of Invention

To the above problem, the utility model provides a portable fingerprint camera device of spectroscope reflection formation of image of horizontal direction multistage reflection, its optical path that can further increase the formation of image light path with reduce the volume to obtain the fingerprint image that the quality is higher, and have better portability and ease for use.

The technical scheme is as follows: portable fingerprint camera device of spectroscope reflection formation of image of horizontal direction multistage reflection, the power distribution box comprises a box body, be equipped with light source assembly, spectroscope in the box, light source assembly includes the light source, photographic hole and examine the material hole have been seted up on the box, the light that the light source sent transmits the spectroscope is in order to form illumination light path, its characterized in that: the illumination light path also comprises a first reflector, and light transmitted through the spectroscope is reflected to the material detection hole at the tail end of the illumination light path through the first reflector; the light reflected by the irradiated fingerprint object at the position of the material detecting hole is reflected by the first reflector and the beam splitter to form an imaging light path, the formed imaging light path is reflected to the photographic hole at the tail end of the imaging light path through the second reflector and the third reflector, and the light path from the light source to the first reflector and the light path from the first reflector to the third reflector are both positioned in the horizontal direction.

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 imaging hole;

further, the optical distance between the condenser and the light source is the same as the focal length of the condenser; the imaging objective lens is arranged on the imaging light path between the spectroscope and the second reflector, the optical axis of the imaging objective lens and the optical axis of the condenser lens are both parallel to the bottom plane of the box body, and the two optical axes are vertically intersected; the spectroscope is arranged on an angular bisector of a right-angle included angle formed by the intersection of the two optical axes, and the spectroscope is perpendicular to the bottom plane of the box body;

furthermore, the material detecting hole is formed in the bottom of the box body, the first reflective mirror is arranged right above the material detecting hole, and the beam splitter is located on the horizontal side of the first reflective mirror; the axis of the optical axis of the condenser is vertically intersected with the axis of the central shaft of the material inspection hole; the first reflector is arranged on the intersection point of the two axes and is vertical to an angle bisector of a right-angle included angle formed by the intersection of the two axes;

further, the second reflector is arranged on the imaging light path between the imaging objective lens and the third reflector, and the second reflector is arranged in parallel with the spectroscope; the photographing hole is arranged at the top of the box body right above the third reflector, and a central shaft of the photographing hole is vertically intersected with an optical axis of the imaging objective lens reflected by the second reflector at a first intersection point; the third reflector is arranged on the first intersection point and is arranged in parallel with the first reflector;

furthermore, the light source assembly adopts a single light source structure, and further comprises a shell and a light transmission amount adjusting piece, wherein the light source is assembled in the shell, the light transmission amount adjusting piece is arranged at the light emitting end of the light source, and the light transmission amount adjusting piece and the light source are coaxially arranged;

furthermore, the shell comprises an upper shell and a lower shell which are connected to form an inverted T-shaped structure, the light source comprises a light homogenizing plate, LED lamp beads and a metal substrate, the metal substrate is arranged in the upper shell, a fixing shell is arranged in the lower shell, the light homogenizing plate is arranged on the fixing shell and is arranged opposite to the LED lamp beads arranged on the metal substrate through a through hole in the fixing shell, and an electric wire connected to the metal substrate is LED out from the upper shell and then is connected with an external power supply;

furthermore, the light flux adjusting part adopts an adjustable diaphragm, the adjustable diaphragm is arranged at the bottom of the lower shell, a diaphragm gear is rotatably connected to the outer part of the upper shell, a shifting fork is assembled on the diaphragm gear, the bottom of the shifting fork is connected with a handle led out from the adjustable diaphragm, a diaphragm motor is arranged on the outer side of the shell, the diaphragm motor is connected with a first gear, and the first gear is in meshed connection with the diaphragm gear;

furthermore, a driving mechanism is arranged in the box body, so that the light emitted by the light source vertically irradiates or obliquely irradiates the fingerprint object at the position of the material detection hole at a certain angle;

furthermore, the driving mechanism adopts a moving mechanism, the light source assembly is connected with the moving mechanism, and the light source is driven by the moving mechanism to move on the focal plane of the condenser lens, so that the light emitted by the light source vertically irradiates or obliquely irradiates the fingerprint object at the position of the material inspection hole at a certain angle;

furthermore, the moving mechanism comprises an assembly moving frame arranged in the box body, the light source assembly and the diaphragm motor are both arranged on the assembly moving frame, a screw is in threaded connection with the assembly moving frame, two ends of the screw are rotationally connected with the inner wall of the box body, the inner wall of the box body is provided with a moving frame motor and a worm connected with the moving frame motor, the screw and the worm are both connected with a worm wheel, and the first sliding rod and the second sliding rod both penetrate through the assembly moving frame and then are connected with the inner wall of the box body;

furthermore, the driving mechanism adopts a rotating mechanism, a light source reflector is further arranged in the box body and arranged on the illumination light path between the light source and the collecting mirror, the light source reflector is connected with the rotating mechanism and is driven by the rotating mechanism to rotate and adjust the angle of the light source reflector, so that the light emitted by the light source vertically irradiates or obliquely irradiates the fingerprint object at the material inspection hole at a certain angle;

furthermore, the central axis of the light source and the optical axis of the condenser are parallel to the bottom plane of the box body and are vertically intersected with the intersection point II; the light source reflector is arranged on the second intersection point and is vertical to the bottom plane of the box body;

further, slewing mechanism includes the mount, the mount is fixed in the bottom inner wall of box, light source assembly, diaphragm motor all install in on the mount, rotate through the pivot on the mount and be connected with the rotating turret, the light source reflector install in on the rotating turret, the pivot with the bottom plane of box is mutually perpendicular, the reflector gear is equipped with to pivot one end, the reflector motor is equipped with on the mount, the reflector motor is connected with gear two, gear two with the meshing of reflector gear is connected.

The beneficial effects of the utility model are that, it utilizes spectroscope reflection imaging, first reflector through setting up, the second reflector, the third reflector, make form the multistage reflection on the horizontal direction on the formation of image light path, the optical path of formation of image light path has further been increased, not only can realize various bright field and dark field of fingerprint and take a picture, and weaken background pattern interference better, under the prerequisite of the fingerprint image that the quality is higher, can further reduce the whole height of device, reduce the device volume, make the device have better portability and easy usability.

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 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is a cross-sectional view taken along line C-C of FIG. 3;

fig. 6 is a schematic view of an illumination light path according to a first embodiment of the present invention;

fig. 7 is a schematic diagram of an imaging optical path according to the first embodiment of the present invention;

fig. 8 is a schematic perspective view of a second embodiment of the present invention;

fig. 9 is a schematic front view of a second embodiment of the present invention;

FIG. 10 isbase:Sub>A sectional view taken along line A-A of FIG. 9;

FIG. 11 is a cross-sectional view taken along line B-B of FIG. 9;

FIG. 12 is a cross-sectional view taken along line C-C of FIG. 10;

fig. 13 is a schematic view of an illumination light path according to a second embodiment of the present invention;

fig. 14 is a schematic diagram of an imaging optical path according to a second embodiment of the present invention;

fig. 15 is a schematic perspective view of a light source assembly according to the first and second embodiments of the present invention;

fig. 16 is a cross-sectional view of a light source assembly according to a first embodiment and a second embodiment of the present invention.

In fig. 1 to 16: 1. a box body; 2. a photo hole; 3. a light source assembly; 4. a beam splitter; 5. material checking holes; 6. a condenser lens; 7. an imaging objective lens; 8. a first reflective mirror; 9. a second reflective mirror; 10. a third reflective mirror; 11. a light source; 12. a lower case; 13. an upper shell; 14. a light homogenizing plate; 15. LED lamp beads; 16. a metal substrate; 17. an adjustable diaphragm; 18. a handle; 19. a stationary housing; 20. an electric wire; 21. a diaphragm gear; 22. a shifting fork; 23. an assembly moving frame; 24. a screw; 25. a first sliding rod; 26. a second sliding rod; 27. a worm gear; 28. a moving frame motor; 29. a worm; 30. a diaphragm motor; 31. a first gear; 32. a light source reflector; 33. a fixed mount; 34. a rotating frame; 35. a mirror gear; 36. a mirror motor; 37. a second gear; 38. a rotating shaft; 39. a through hole; 40. a first intersection point; 41. and a second intersection point.

Detailed Description

Example one

As shown in fig. 1 to 7, 15 and 16, the portable fingerprint camera device with multi-level reflective beam splitter mirror reflective imaging in the horizontal direction comprises a box body 1, a light source assembly 3 and a beam splitter mirror 4 are arranged in the box body 1, the light source assembly 3 comprises a light source 11, a photographing hole 2 and a material detecting hole 5 for irradiating a fingerprint object (not shown in the figure) are formed in the box body 1, light emitted by the light source 11 transmits through the beam splitter mirror 4 to form an illumination light path, the illumination light path further comprises a first reflective mirror 8, and the light transmitted through the beam splitter mirror 4 is reflected to the material detecting hole 5 at the tail end of the illumination light path through the first reflective mirror 8; the light reflected by the irradiated fingerprint object positioned at the material detecting hole 5 is reflected by the first reflecting mirror 8 and the spectroscope 4 to form an imaging light path, and is reflected to the photographic hole 2 at the tail end of the imaging light path through the second reflecting mirror 9 and the third reflecting mirror 10 arranged on the formed imaging light path, and the light path from the light source 11 to the first reflecting mirror 8 and the light path from the first reflecting mirror 8 to the third reflecting mirror 10 are both positioned in the horizontal direction.

Still be equipped with condensing lens 6, formation of image objective 7 in the box 1, condensing lens 6 sets up on the illumination light path between light source 11 and spectroscope 4, and formation of image objective 7 sets up on the formation of image light path between spectroscope 4 and photographic aperture 2.

The optical distance between the condenser 6 and the light source 11 is the same as the focal length of the condenser 6; the imaging objective lens 7 is arranged on an imaging light path between the spectroscope 4 and the second reflective mirror 9, the optical axis of the imaging objective lens 7 and the optical axis of the condenser lens 6 are both parallel to the bottom plane of the box body 1, and the two optical axes are vertically intersected; the spectroscope 4 is arranged on an angular bisector of a right angle included angle formed by the intersection of two optical axes, and the spectroscope 4 is perpendicular to the bottom plane of the box body 1.

The material detecting hole 5 is arranged at the bottom of the box body 1, the first reflective mirror 8 is arranged right above the material detecting hole 5, and the spectroscope 4 is positioned at the horizontal side of the first reflective mirror 8; the axis of the optical axis of the condenser 6 is vertically intersected with the axis of the central shaft of the material detecting hole 5; the first reflector 8 is arranged on the intersection point of the two axes and is vertical to the bisector of a right angle formed by the intersection of the two axes.

The second reflecting mirror 9 is arranged on an imaging light path between the imaging objective lens 7 and the third reflecting mirror 10, and the second reflecting mirror 9 is arranged in parallel with the spectroscope 4; the photographic hole 2 is arranged at the top of the box body 1 right above the third reflector 10, and the central axis of the photographic hole 2 is vertically intersected with the optical axis of the imaging objective lens 7 reflected by the second reflector 9 at a first intersection point 40; the third reflecting mirror 10 is disposed on the first intersection 40, and the third reflecting mirror 10 is disposed in parallel with the first reflecting mirror 8.

The light source assembly 3 adopts a single light source structure, and further comprises a shell and a light transmission quantity adjusting piece, wherein the light source 11 is assembled in the shell, the light transmission quantity adjusting piece is arranged at the light emitting end of the light source 11, and the light transmission quantity adjusting piece and the light source 11 are coaxially arranged; the shell comprises an upper shell 13 and a lower shell 12 which are connected to form an inverted T-shaped structure, the light source 11 comprises a light homogenizing plate 14, LED lamp beads 15 and a metal substrate 16, the metal substrate 16 is arranged in the upper shell 13, a fixing shell 19 is arranged in the lower shell 12, the light homogenizing plate 14 is arranged on the fixing shell 19 and is arranged opposite to the LED lamp beads 15 arranged on the metal substrate 16 through a through hole 39 in the fixing shell 19, and an electric wire 20 connected to the metal substrate 16 is LED out of the upper shell 13 and then is connected with an external power supply; the light flux adjusting part adopts an adjustable diaphragm 17, the adjustable diaphragm 17 is the prior art, details are not repeated in the patent, a handle 18 capable of adjusting the size of the diaphragm is arranged on the adjustable diaphragm 17, the adjustable diaphragm 17 is arranged at the bottom of the lower shell 12, a diaphragm gear 21 is rotatably connected to the outer part of the upper shell 13, a shifting fork 22 is assembled on the diaphragm gear 21, the bottom of the shifting fork 22 is connected with the handle 18 led out from the adjustable diaphragm 17, namely, the fork head of the shifting fork 22 is inserted into the handle 18; the outer side of the shell is provided with a diaphragm motor 30, the diaphragm motor 30 is connected with a first gear 31, and the first gear 31 is meshed with the diaphragm gear 21.

A driving mechanism is arranged in the box body 1, so that light emitted by the light source 11 vertically irradiates or obliquely irradiates a fingerprint object at the position of the material detection hole 5 at a certain angle; specifically, the driving mechanism adopts a moving mechanism, the light source assembly 3 is connected with the moving mechanism, and the light source 11 is driven by the moving mechanism to move on the focal plane of the condenser lens 6; the moving mechanism comprises an assembly moving frame 23 arranged in the box body 1, the light source assembly 3 and the diaphragm motor 30 are both arranged on the assembly moving frame 23, a screw 24 is in threaded connection with the assembly moving frame 23, two ends of the screw 24 are rotationally connected with the inner wall of the box body 1, the inner wall of the box body 1 is provided with a moving frame motor 28 and a worm 29 connected with the moving frame motor 28, the screw 24 and the worm 29 are both connected with a worm wheel 27, and a first sliding rod 25 and a second sliding rod 26 both penetrate through the assembly moving frame 23 and then are connected with the inner wall of the box body 1;

the principle of realizing that the light emitted by the light source 11 vertically irradiates or obliquely irradiates the fingerprint object at the material detecting hole 5 at a certain angle is as follows: the moving frame motor 28 drives the worm 29 to rotate, the worm 29 drives the worm wheel 27 and the screw 24 to rotate, the screw 24 drives the assembly moving frame 23 to slide along the first sliding rod 25 and the second sliding rod 26, so that the light source 11 in the light source assembly 3 can move on the focal plane of the condensing lens 6, when the center of the light source 11 is positioned at a focal point on the axis of the condensing lens 6, the light emitted by the light source 11 vertically irradiates a fingerprint object at the material detection hole 5, and when the center of the light source 11 deviates from the focal point on the axis of the condensing lens 6, the light emitted by the light source 11 obliquely irradiates the fingerprint object at the material detection hole 5 at a certain angle; and the diaphragm motor 30 drives the first gear 31 to rotate, the first gear 31 drives the diaphragm gear 21 to rotate, and the diaphragm gear 21 drives the shifting fork 22 and the handle 18 to rotate, so that the light passing aperture of the adjustable diaphragm 17 is changed.

The utility model discloses a working process is:

bright field fingerprint appearance: by the movement of the assembly moving frame 23, the center of the light source 11 in the light source assembly 3 is placed at a focal point on the axis of the condenser lens 6, the LED lamp beads 15 are powered on to emit light, the light emitted by the LED lamp beads 15 illuminates the light homogenizing plate 14, the light emitting area of the light homogenizing plate 14 is controlled by changing the light passing aperture of the adjustable diaphragm 17, the light emitted by the light source 11 is converged by the condenser lens 6 to become approximately parallel light, the approximately parallel light is transmitted through the spectroscope 4 and then reflected by the first reflecting mirror 8 to be approximately vertically irradiated to the fingerprint object at the material detecting hole 5, the smooth and flat surface of the fingerprint object is equivalent to a mirror, the reflected light is still approximately parallel light, the approximately parallel light enters the imaging objective lens 7 after being reflected for the first time by the first reflecting mirror 8 and the second reflecting by the spectroscope 4, and then is reflected for the third time by the second reflecting mirror 9 and the fourth reflecting mirror 10 to the photographic hole 2, and finally the light color is imaged by a camera to be represented as the background of a bright field; the fingerprint lines on the surface of the fingerprint object and the background patterns on the lower layer of the surface of the object are irradiated by light emitted by the light source 11, the reflected light has scattering property, the luminous flux which finally enters the camera at the position of the photographic hole 2 for imaging is relatively less after four reflections by the first reflecting mirror 8, the spectroscope 4, the second reflecting mirror 9 and the third reflecting mirror 10, the fingerprint lines are expressed as dark lines with lower brightness than light background, and the background patterns are weakened; compared with the optical path length of reflected light of a fingerprint object in a traditional spectroscope transmission imaging method and a reflection imaging portable fingerprint photographic device (patent number: ZL 202021197355.1), the optical path length of the imaging optical path reaching the top of the device after the reflected light of the fingerprint object is reflected for four times by a first reflecting mirror 8, a spectroscope 4, a second reflecting mirror 9 and a third reflecting mirror 10 and then reaches a photographic hole 2 is greatly prolonged, the reflected light of a fingerprint line and a background pattern on the lower layer of the surface of the object is scattered light, the luminous flux entering a camera at the photographic hole 2 along with the prolonging of the optical path is greatly reduced, the reflected light of a smooth and flat surface of the fingerprint object is approximate parallel light, the luminous flux entering the camera at the photographic hole 2 along with the prolonging of the optical path is reduced a little, therefore, the contrast between the fingerprint line and a light-colored background can be larger and the background pattern can be better weakened by the prolonging of the optical path of the imaging optical path; and the illumination intensity of the fingerprint lines and the lower background patterns on the surface of the object is further improved or reduced by adjusting the clear aperture of the adjustable diaphragm 17, and the brightness of the light source 11 is adjusted until the appearance effect of the fingerprint lines is optimal.

Dark field fingerprint appearance: with the utility model discloses each item parameter setting that well light field fingerprint appeared keeps unanimous, show light field fingerprint image earlier, through the removal of light source assembly 3, focus on the skew condensing lens 6 of the center of light source 11, the light that makes light source 11 send becomes approximate parallel light after converging by condensing lens 6, pass through spectroscope 4 and shine the fingerprint object of examining material hole 5 department with certain angle slope after the reflection of first reflector 8 again, the smooth level surface of fingerprint object is equivalent to a mirror, its reverberation is still approximate parallel light, along with the increase of the light inclination angle of fingerprint object, the light that reflects also deviates more and more from the optical axis of formation of image light path after the quartic reflection of first reflector 8, spectroscope 4, second reflector 9 and third reflector 10, the luminous flux that finally reachs in the camera of photography hole 2 department formation of image is also less and less, cause the smooth level surface of fingerprint object to image as the dark background of dark field; under the irradiation of oblique approximately parallel light, the reflected light of the fingerprint lines on the object has scattering property, the luminous flux of the image formed in the camera at the position of the photographic hole 2 is relatively more, the fingerprint lines are expressed as light-color lines with higher brightness than dark background brightness, the incident angle of the incident light of the fingerprint object is changed by further moving the position of the light source assembly 3, the clear aperture of the adjustable diaphragm 17 is adjusted, and the brightness of the light source 11 is adjusted until the appearance effect of the fingerprint lines is optimal.

Example two

As shown in fig. 8 to 16, the portable fingerprint photographing device with multi-level reflective beam splitter mirror reflection imaging in the horizontal direction comprises a box body 1, a light source assembly 3 and a beam splitter mirror 4 are arranged in the box body 1, the light source assembly 3 comprises a light source 11, a photographing hole 2 and a material detecting hole 5 for irradiating a fingerprint object (not shown in the figure) are formed in the box body 1, light emitted by the light source 11 transmits through the beam splitter mirror 4 to form an illumination light path, the illumination light path further comprises a first reflective mirror 8, and light transmitted through the beam splitter mirror 4 is reflected to the material detecting hole 5 at the tail end of the illumination light path through the first reflective mirror 8; the light reflected by the irradiated fingerprint object positioned at the material detecting hole 5 is reflected by the first reflecting mirror 8 and the spectroscope 4 to form an imaging light path, and is reflected to the photographic hole 2 at the tail end of the imaging light path through the second reflecting mirror 9 and the third reflecting mirror 10 arranged on the formed imaging light path, and the light path from the light source 11 to the first reflecting mirror 8 and the light path from the first reflecting mirror 8 to the third reflecting mirror 10 are both positioned in the horizontal direction.

Still be equipped with condensing lens 6, formation of image objective 7 in the box 1, condensing lens 6 sets up on the illumination light path between light source 11 and spectroscope 4, and formation of image objective 7 sets up on the formation of image light path between spectroscope 4 and photographic aperture 2.

The optical distance between the condenser 6 and the light source 11 is the same as the focal length of the condenser 6; the imaging objective lens 7 is arranged on an imaging light path between the spectroscope 4 and the second reflecting mirror 9, the optical axis of the imaging objective lens 7 and the optical axis of the collecting mirror 6 are both parallel to the bottom plane of the box body 1, and the two optical axes are vertically intersected; the spectroscope 4 is arranged on an angular bisector of a right angle included angle formed by the intersection of two optical axes, and the spectroscope 4 is perpendicular to the bottom plane of the box body 1.

The material detecting hole 5 is arranged at the bottom of the box body 1, the first reflective mirror 8 is arranged right above the material detecting hole 5, and the spectroscope 4 is positioned at the horizontal side of the first reflective mirror 8; the axis of the optical axis of the condenser 6 is vertically intersected with the axis of the central shaft of the material detecting hole 5; the first reflector 8 is arranged on the intersection point of the two axes and is vertical to the bisector of a right angle formed by the intersection of the two axes.

The second reflecting mirror 9 is arranged on an imaging light path between the imaging objective lens 7 and the third reflecting mirror 10, and the second reflecting mirror 9 is arranged in parallel with the spectroscope 4; the photographic hole 2 is arranged at the top of the box body 1 right above the third reflector 10, and a central shaft of the photographic hole 2 is vertically intersected with an optical axis of the imaging objective lens 7 reflected by the second reflector 9 at a first intersection point 40; the third reflecting mirror 10 is disposed on the first intersection 40, and the third reflecting mirror 10 is disposed in parallel with the first reflecting mirror 8.

The light source assembly 3 adopts a single light source structure, and further comprises a shell and a light transmission quantity adjusting piece, wherein the light source 11 is assembled in the shell, the light transmission quantity adjusting piece is arranged at the light emitting end of the light source 11, and the light transmission quantity adjusting piece and the light source 11 are coaxially arranged; the shell comprises an upper shell 13 and a lower shell 12 which are connected to form an inverted T-shaped structure, the light source 11 comprises a light homogenizing plate 14, LED lamp beads 15 and a metal substrate 16, the metal substrate 16 is arranged in the upper shell 13, a fixing shell 19 is arranged in the lower shell 12, the light homogenizing plate 14 is arranged on the fixing shell 19 and is arranged opposite to the LED lamp beads 15 arranged on the metal substrate 16 through a through hole 39 in the fixing shell 19, and an electric wire 20 connected to the metal substrate 16 is LED out of the upper shell 13 and then is connected with an external power supply; the light flux adjusting part adopts an adjustable diaphragm 17, the adjustable diaphragm 17 is the prior art, details are not repeated in the patent, a handle 18 capable of adjusting the size of the diaphragm is arranged on the adjustable diaphragm 17, the adjustable diaphragm 17 is arranged at the bottom of the lower shell 12, the outer part of the upper shell 13 is rotatably connected with a diaphragm gear 21, a shifting fork 22 is assembled on the diaphragm gear 21, the bottom of the shifting fork 22 is connected with the handle 18 led out from the adjustable diaphragm 17, namely, the fork head of the shifting fork 22 is inserted into the handle 18; the outer side of the shell is provided with a diaphragm motor 30, the diaphragm motor 30 is connected with a first gear 31, and the first gear 31 is meshed with the diaphragm gear 21.

A driving mechanism is arranged in the box body 1, so that light emitted by the light source 11 vertically irradiates or obliquely irradiates a fingerprint object at the material detection hole 5 at a certain angle; specifically, the driving mechanism adopts a rotating mechanism, a light source reflector 32 is further arranged in the box body 1, the light source reflector 32 is arranged on a lighting light path between the light source 11 and the collecting mirror 6, the light source reflector 32 is connected with the rotating mechanism and is driven by the rotating mechanism to rotate and adjust the angle of the light source reflector 32, so that the light emitted by the light source 11 vertically irradiates or obliquely irradiates the fingerprint object at the material detecting hole 5 at a certain angle; the central axis of the light source 11 and the optical axis of the condenser 6 are both parallel to the bottom plane of the box body 1 and are vertically intersected at the intersection point II 41; the light source reflector 32 is disposed on the second intersection 41, and the light source reflector 32 is perpendicular to the bottom plane of the case 1.

The rotating mechanism comprises a fixed frame 33, the fixed frame 33 is fixed on the inner wall of the bottom of the box body 1, the light source assembly 3 and the diaphragm motor 30 are both arranged on the fixed frame 33, the fixed frame 33 is rotatably connected with a rotating frame 34 through a rotating shaft 38, the light source reflector 32 is arranged on the rotating frame 34, the rotating shaft 38 is vertical to the bottom plane of the box body 1, one end of the rotating shaft 38 is provided with a reflector gear 35, the fixed frame 33 is provided with a reflector motor 36, the reflector motor 36 is connected with a second gear 37, and the second gear 37 is in meshed connection with the reflector gear 35;

the principle of realizing that the light emitted by the light source 11 vertically irradiates or obliquely irradiates the fingerprint object at the material detecting hole 5 at a certain angle is as follows: the mirror motor 36 drives the second gear 37 to rotate, the second gear 37 drives the mirror gear 35 and the rotating frame 34 to rotate along the rotating shaft 38, so that the light source mirror 32 can rotate, when the light source mirror 32 is perpendicular to an angular bisector of a right angle formed by a central axis of the light source 11 and an optical axis of the collecting mirror 6, namely the light source mirror 32 deflects the light emitted by the light source 11 by 90 degrees horizontally, the light emitted by the light source 11 vertically irradiates the fingerprint object at the material inspection hole 5, and when the light source mirror 32 is not perpendicular to the angular bisector of a right angle formed by the central axis of the light source 11 and the optical axis of the collecting mirror 6, namely the light emitted by the light source 11 deflects the light by more than 90 degrees or less than 90 degrees horizontally, the light emitted by the light source 11 obliquely irradiates the fingerprint object at the material inspection hole 5 at a certain angle; and the diaphragm motor 30 drives the first gear 31 to rotate, the first gear 31 drives the diaphragm gear 21 to rotate, and the diaphragm gear 21 drives the shifting fork 22 and the handle 18 to rotate, so that the light passing aperture of the adjustable diaphragm 17 is changed.

The utility model discloses a working process is:

bright field fingerprint appearance: the light source reflector 32 rotates to enable the light source reflector 32 to be perpendicular to the central axis of the light source 11 and an angular bisector of a right-angle included angle formed by an optical axis of the condenser 6, namely the light source reflector 32 deflects the light emitted by the light source 11 in the horizontal direction by 90 degrees, the LED lamp beads 15 are powered on to emit light, the light emitted by the LED lamp beads 15 illuminates the light homogenizing plate 14, the light emitting area of the light homogenizing plate 14 is controlled by changing the light through aperture of the adjustable diaphragm 17, the light emitted by the light source 11 is reflected by the light source reflector 32 and converged by the condenser 6 to form approximate parallel light, the approximate parallel light is transmitted through the spectroscope 4 and then reflected by the first reflector 8 to almost vertically irradiate a fingerprint object at the material detecting hole 5, the smooth and flat surface of the fingerprint object is equivalent to a mirror, the reflected light still is approximate parallel light, the reflected light enters the imaging objective lens 7 after being reflected for the first time by the first reflector 8 and the spectroscope 4 and then enters the imaging objective lens 7 after being reflected for the third reflector 9 and the fourth time by the third reflector 10 to the photographic hole 2, and finally the light color is imaged by a camera to represent a light background of a bright field; the fingerprint lines on the surface of the fingerprint object and the background patterns on the lower layer of the surface of the object are irradiated by light emitted by the light source 11, the reflected light has scattering property, the luminous flux which finally enters the camera at the position of the photographic hole 2 for imaging is relatively less after four reflections by the first reflecting mirror 8, the spectroscope 4, the second reflecting mirror 9 and the third reflecting mirror 10, the fingerprint lines are expressed as dark lines with lower brightness than light background, and the background patterns are weakened; compared with the optical path length of reflected light of a fingerprint object in a traditional spectroscope transmission imaging method and a reflection imaging portable fingerprint photographic device (patent number: ZL 202021197355.1), the optical path length of the imaging optical path reaching the top of the device after the reflected light of the fingerprint object is reflected for four times by a first reflecting mirror 8, a spectroscope 4, a second reflecting mirror 9 and a third reflecting mirror 10 and then reaches a photographic hole 2 is greatly prolonged, the reflected light of a fingerprint line and a background pattern on the lower layer of the surface of the object is scattered light, the luminous flux entering a camera at the photographic hole 2 along with the prolonging of the optical path is greatly reduced, the reflected light of a smooth and flat surface of the fingerprint object is approximate parallel light, the luminous flux entering the camera at the photographic hole 2 along with the prolonging of the optical path is reduced a little, therefore, the contrast between the fingerprint line and a light-colored background can be larger and the background pattern can be better weakened by the prolonging of the optical path of the imaging optical path; and the illumination intensity of the fingerprint lines and the lower background patterns on the surface of the object is further improved or reduced by adjusting the clear aperture of the adjustable diaphragm 17, and the brightness of the light source 11 is adjusted until the appearance effect of the fingerprint lines is optimal.

Dark field fingerprint appearance: with the utility model discloses the various parameter settings that well light field fingerprint appeared keep unanimous, show light field fingerprint image earlier, through the rotation of light source reflector 32, make the light that light source 11 sent deviate from original 90 °, that is to say make the light that light source 11 sent reflect and gather after condensing lens 6 with light source reflector 32 and become approximate parallel light, pass through spectroscope 4 and shine the fingerprint object of examining material hole 5 department with certain angle slope after the reflection of first reflector 8 again, the smooth surface of fingerprint object is equivalent to a mirror, its reverberation is still approximate parallel light, along with the increase of the illumination inclination angle of fingerprint object, the light that reflects also more and more deviates from the optical axis of formation of image light path after the quartic reflection of first reflector 8, spectroscope 4, second reflector 9 and third reflector 10, the luminous flux that finally reachs in the camera of photography hole 2 department formation of image also is less and less, cause the smooth surface of fingerprint object to image as the dark background of dark field object; and under the irradiation of oblique approximately parallel light, the fingerprint lines on the object have scattering property of reflected light, the luminous flux of the light entering the camera at the photographic hole 2 is relatively more, the fingerprint lines are expressed as light-colored lines with higher brightness than dark background brightness, the incident angle of the incident light of the fingerprint object is changed by further rotating the light source reflector 32, the clear aperture of the adjustable diaphragm 17 is adjusted, and the brightness of the light source 11 is adjusted until the appearance effect of the fingerprint lines is optimal.

To sum up, the utility model discloses a photographic arrangement utilizes spectroscope 4 reflection imaging, obtains approximate parallel light irradiation fingerprint object through the cooperation of light source assembly 3 with condensing lens 6, and the light that the fingerprint object reflects arrives photographic hole 2 after the quartic reflection of first reflector 8, spectroscope 4, second reflector 9 and third reflector 10, has prolonged the optical path of formation of image light path to the contrast of fingerprint line and object background in the bright field fingerprint appearance mode of greatly reinforcing, weaken the interference of eliminating the object background pattern even better, can obtain the bright field fingerprint image of higher quality; secondly, the light path direction is changed by moving the light source assembly 3 or rotating the light source reflector 32, so that the fingerprint object can be vertically irradiated or obliquely irradiated by incident light, and a bright field or dark field image of the fingerprint can be obtained; in short, by arranging the optical devices such as the light source assembly 3, the spectroscope 4, the condenser lens 6, the imaging objective lens 7, the first reflecting mirror 8, the second reflecting mirror 9, the third reflecting mirror 10 and the like on the same horizontal plane, the overall height of the device can be further reduced, and the device has better portability and usability.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. For example, by moving the condenser lens 6 perpendicular to the optical axis, the light emitted from the light source 11 can be irradiated onto the fingerprint object at the material inspection hole 5 perpendicularly or obliquely at a certain angle; the number of reflectors is increased in the imaging light path, so that the imaging light path can be further prolonged. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.

Claims (14)

1. Portable fingerprint camera device of spectroscope reflection formation of image of horizontal direction multistage reflection, the power distribution box comprises a box body, be equipped with light source assembly, spectroscope in the box, light source assembly includes the light source, photographic hole and examine the material hole have been seted up on the box, the light that the light source sent transmits the spectroscope is in order to form illumination light path, its characterized in that: the illumination light path also comprises a first reflector, and light transmitted through the spectroscope is reflected to the material detection hole at the tail end of the illumination light path through the first reflector; the light reflected by the irradiated fingerprint object at the position of the material detecting hole is reflected by the first reflector and the beam splitter to form an imaging light path, the formed imaging light path is reflected to the photographic hole at the tail end of the imaging light path through the second reflector and the third reflector, and the light path from the light source to the first reflector and the light path from the first reflector to the third reflector are both positioned in the horizontal direction.

2. A spectroscopic reflection imaging portable fingerprint camera apparatus for horizontal multi-stage reflection 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 spectroscopic reflection imaging portable fingerprint camera apparatus for horizontal multi-stage reflection according to claim 2, wherein: the optical distance between the collecting mirror and the light source is the same as the focal length of the collecting mirror; the imaging objective lens is arranged on the imaging light path between the spectroscope and the second reflective mirror, the optical axis of the imaging objective lens and the optical axis of the condenser lens are both parallel to the bottom plane of the box body, and the two optical axes are vertically intersected; the spectroscope is arranged on an angle bisector of a right angle included angle formed by the intersection of the two optical axes, and the spectroscope is perpendicular to the bottom plane of the box body.

4. A spectroscopic reflection imaging portable fingerprint camera apparatus for horizontal multi-stage reflection according to claim 2, wherein: the material detecting hole is formed in the bottom of the box body, the first reflective mirror is arranged right above the material detecting hole, and the spectroscope is located on the horizontal side of the first reflective mirror; the axis of the optical axis of the condenser is vertically intersected with the axis of the central shaft of the material inspection hole; the first reflector is arranged on the intersection point of the two axes and is vertical to an angular bisector of a right-angle included angle formed by the intersection of the two axes.

5. A spectroscopic reflection imaging portable fingerprint camera apparatus for horizontal multi-stage reflection according to claim 2, wherein: the second reflecting mirror is arranged on the imaging light path between the imaging objective lens and the third reflecting mirror, and the second reflecting mirror is arranged in parallel with the spectroscope; the photographic hole is arranged at the top of the box body right above the third reflector, and a central shaft of the photographic hole is vertically intersected with an optical axis of the imaging objective lens reflected by the second reflector at a first intersection point; the third reflector is arranged on the first intersection point, and the third reflector and the first reflector are arranged in parallel.

6. A spectroscopic reflection imaging portable fingerprint camera apparatus for horizontal multi-stage reflection according to claim 2, wherein: the light source assembly adopts single light source structure, still includes casing, logical light volume regulating part, the light source assemble in the casing, logical light volume regulating part set up in the light-emitting end of light source, just logical light volume regulating part with the light source sets up with the axle center.

7. A spectroscopic reflectometry portable fingerprint camera apparatus for horizontal multi-stage reflectometry as in claim 6 wherein: the LED lamp comprises a shell and a light source, wherein the shell comprises an upper shell and a lower shell which are connected with each other to form an inverted T-shaped structure, the light source comprises a light homogenizing plate, LED lamp beads and a metal substrate, the metal substrate is arranged in the upper shell, a fixing shell is arranged in the lower shell, the light homogenizing plate is arranged on the fixing shell and is arranged opposite to the LED lamp beads arranged on the metal substrate through holes in the fixing shell, and electric wires connected to the metal substrate are LED out from the upper shell and then connected with an external power supply.

8. A spectroscopic reflection imaging portable fingerprint camera apparatus for horizontal multi-stage reflection according to claim 7, wherein: the adjustable diaphragm is arranged at the bottom of the lower shell, a diaphragm gear is rotatably connected to the outer portion of the upper shell, a shifting fork is assembled on the diaphragm gear, the bottom of the shifting fork is connected with a handle led out of the adjustable diaphragm, a diaphragm motor is arranged on the outer side of the shell and connected with a first gear, and the first gear is in meshed connection with the diaphragm gear.

9. A spectroscopic reflection imaging portable fingerprint photographing device having multi-stage reflection in the horizontal direction according to any one of claims 2 to 8, wherein: and a driving mechanism is arranged in the box body, so that the light emitted by the light source vertically irradiates or obliquely irradiates the fingerprint object at the material detection hole at a certain angle.

10. A horizontal multi-stage reflective spectroscopic reflection imaging portable fingerprint camera device as claimed in claim 9, wherein: the driving mechanism adopts a moving mechanism, the light source assembly is connected with the moving mechanism, and the light source is driven by the moving mechanism to move on the focal plane of the condenser lens, so that the light emitted by the light source vertically irradiates or obliquely irradiates at a certain angle on the fingerprint object at the position of the detection hole.

11. A horizontal multi-stage reflective spectroscopic imaging portable fingerprinting device in accordance with claim 10 wherein: the moving mechanism comprises an assembly moving frame arranged in the box body, the light source assembly and the diaphragm motor are arranged on the assembly moving frame, a screw is in threaded connection with the assembly moving frame, two ends of the screw are rotationally connected with the inner wall of the box body, the inner wall of the box body is provided with a moving frame motor and a worm connected with the moving frame motor, the screw and the worm are connected with a worm wheel, and the first sliding rod and the second sliding rod penetrate through the assembly moving frame and then are connected with the inner wall of the box body.

12. A horizontal multi-stage reflective spectroscopic reflection imaging portable fingerprint camera device as claimed in claim 9, wherein: the fingerprint object inspection device is characterized in that the driving mechanism adopts a rotating mechanism, a light source reflector is further arranged in the box body, the light source reflector is arranged on the illumination light path between the light source and the collecting lens, the light source reflector is connected with the rotating mechanism and is driven by the rotating mechanism to rotate and adjust the angle of the light source reflector, so that light emitted by the light source is vertically irradiated or obliquely irradiated to the fingerprint object at the position of the material inspection hole at a certain angle.

13. A horizontal multi-stage reflective spectroscopic reflectometry portable fingerprint camera device as in claim 12, wherein: the central shaft of the light source and the optical axis of the condenser are both parallel to the bottom plane of the box body and are vertically intersected at the intersection point II; the light source reflector is arranged on the intersection point II and is perpendicular to the bottom plane of the box body.

14. A horizontal multi-stage reflective spectroscopic imaging portable fingerprinting device in accordance with claim 13 wherein: the rotating mechanism comprises a fixing frame, the fixing frame is fixed on the inner wall of the bottom of the box body, the light source assembly and the diaphragm motor are both installed on the fixing frame, a rotating frame is connected to the fixing frame in a rotating mode through a rotating shaft, the light source reflector is installed on the rotating frame, the rotating shaft is perpendicular to the plane of the bottom of the box body, a reflector gear is installed at one end of the rotating shaft, a reflector motor is installed on the fixing frame and is connected with a second gear, and the second gear is connected with the reflector gear in a meshed mode.

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