CN111596506A - Portable fingerprint photographic arrangement of transmission formation of image - Google Patents

Abstract

The invention provides a transmission 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 shoot 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 forms the illumination light path after the spectroscope reflection, 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 that the fingerprint object is shone the back reflection is shone passes the spectroscope forms the formation of image light path, the formation of image light path sets up the optical element who has reflection of light function, shoot the hole set up in the warp light path after the optical element reflection is terminal on the box.

Description

Portable fingerprint photographic arrangement of transmission formation of image

Technical Field

The invention relates to the technical field of court science, in particular to a portable fingerprint photographic device for transmission 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 transmission 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 transmission 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 forms the illumination light path after the spectroscope reflects, be located illumination light path terminal 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 after the reflection passes through the spectroscope 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 process on the box of the light path terminal after the optical element reflection.

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 photographic hole;

furthermore, the optical distance between the condenser and the light source is the same as the focal length of the condenser, two optical elements are arranged and are divided into a first reflector and a second reflector, the imaging objective lens is arranged between the first reflector and the second reflector, and the first reflector and the second reflector are arranged at an included angle of 45 degrees with the optical axis of the imaging objective lens;

furthermore, the material detection hole is arranged at the bottom of the box body, the spectroscope and the first reflector are sequentially arranged right above the material detection hole, the photographing hole is arranged on the box body right above the second reflector, and the condenser and the light source are sequentially arranged on the illumination light path on the side of 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, the first worm is in rotary connection with the first worm wheel, 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;

furthermore, the spectroscope is adjustable in angle through a rotating mechanism;

further, slewing mechanism includes the spectroscope mount, the spectroscope is fixed in on the spectroscope mount, the spectroscope mount is connected with worm wheel two pass spectroscope pivot, just spectroscope pivot both ends rotate connect in the box inner wall, the box inner wall be equipped with servo motor three and with servo motor three phase connection's worm three, worm three with worm wheel two rotates and connects.

The invention has the advantages that approximately parallel light is obtained through the matching of the light source assembly and the condenser lens, the total height of the device is greatly reduced compared with the traditional directional reflection light distribution method, the miniaturization is realized, on the basis, bright field and dark field fingerprint images can be obtained, the light reflected by a fingerprint object under the irradiation of the light source reaches the photographic hole after being reflected twice by the optical element with the light reflection function, 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 use value is better.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

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

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

FIG. 4 is a side sectional view of a light source assembly of the present invention;

FIG. 5 is a front view of a light source assembly of the present invention;

FIG. 6 is a light emission schematic view in bright field directional reflection mode and dark field mode of FIG. 5;

fig. 7 is a view showing illumination in the dark field directional reflection mode of fig. 5.

In fig. 1 to 7: 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 spectroscope fixing frame; 24. a second worm gear; 25. a servo motor III; 26. a worm III; 27. a spectroscope rotation axis; 28. a central light source; 29. a peripheral light source; 30. a first sliding rod; 31. and a second sliding rod.

Detailed Description

As shown in figures 1-7, a portable fingerprint camera device for transmission imaging comprises a box body 1 and a camera hole 8 arranged on the box body 1, a light source assembly 2 and a spectroscope 3 are arranged in the box body 1, the light source assembly 2 comprises a light source 11, light emitted by the light source 11 is reflected by the spectroscope 3 to form an illumination light path, a material detecting hole 7 used for irradiating a fingerprint object (not shown in the figure) is arranged on the box body 1 at the tail end of the illumination light path, the fingerprint object positioned at the material detecting hole 7 is irradiated and reflected by the irradiated light to form an imaging light path through the spectroscope 3, an optical element with a light reflecting function is arranged on the imaging light path, the camera hole 8 is arranged on the box body 1 at the tail end of the light path reflected by the optical element, and the camera hole 8 is externally connected with a camera

A condenser lens 4 and an imaging objective lens 5 are further arranged in the box body 1, the condenser lens 4 is arranged on an illumination light path between the light source 11 and the spectroscope 3, the imaging objective lens 5 is arranged on an imaging light path between the spectroscope 3 and the photographic hole 8, the number of the optical elements is two, the optical elements are divided into a first reflective mirror 6 and a second reflective mirror 9, and specifically, the imaging objective lens 5 is arranged between the first reflective mirror 6 and the second reflective mirror 9; the material detecting hole 7 is arranged at the bottom of the box body 1, the spectroscope 3 and the first reflective mirror 6 are sequentially arranged right above the material detecting hole 7, the photographing hole 8 is arranged on the box body 1 right above the second reflective mirror 9, and the condenser 4 and the light source 11 are sequentially arranged on the side of the spectroscope 3; the optical distance between the condenser lens 4 and the light source 11 is the same as the focal length of the condenser lens 4, and the first reflective mirror 6 and the second reflective mirror 9 are arranged at an included angle of 45 degrees with the optical axis of the imaging objective lens 5, so that the collimation of an imaging optical path is ensured.

The light source assembly 2 is arranged at the bottom of the box body 1, the light source assembly 2 further comprises a shell 10 and an adjustable diaphragm 12, the adjustable diaphragm 12 is in the prior art, details are not repeated in the patent, the light source 11 can adopt a single light source or a combined light source, and can be set as the case may be, the light source 11 in the embodiment of the patent adopts a combined light source, the adopted prior art is that the combined light source is formed by combining a central light source 28 and a peripheral light source 29, the central light source 28 adopts a surface light source, the peripheral light source 29 adopts annularly distributed LED lamp beads, and the brightness of the central light source 28 and the brightness of the peripheral light source 29 are both; the central light source 28 and the peripheral light source 29 are separated by the light-isolating cylinder 30, and the light emitted by the central light source 28 in the light-isolating cylinder 30 and the light emitted by the peripheral light source 29 outside the light-isolating cylinder 30 are illuminated respectively and do not interfere with each other; the light source 11 and the adjustable diaphragm 12 are both assembled in the casing 10, the adjustable diaphragm 12 is arranged at the light emitting end of the light source 11, the adjustable diaphragm 12 and the light source 11 are coaxially arranged, the outer wall of the casing 10 is rotatably connected with a diaphragm worm gear 15, the diaphragm worm gear 15 is connected with a handle 13 on the adjustable diaphragm 12, the handle 13 is driven to rotate through the rotation of the diaphragm worm gear 15, so that the position of a blade 14 on the adjustable diaphragm 12 can be adjusted to adjust the diaphragm aperture of the adjustable diaphragm 12, and the light emitting area of the light source 11 is controlled. Wherein, the light emitting area of the central light source 28 should ensure that the light-colored background image of the central light source 28 shown in the camera at the photographic hole 8 in the bright field directional reflection mode fills the observation field of view; the diameter of the annular distribution of the LED beads of the peripheral light source 29 should be as small as possible, and it should be ensured that no obvious bright spot image of the LED beads is visible in the observation field of the camera at the photographing hole 8.

A driving mechanism is arranged in the box body 1, and the light source assembly 2 is driven by the driving mechanism to enable the light source 11 to move on a focal plane of the condenser lens 4; the driving mechanism comprises an assembly fixing frame 16 arranged in the box body 1, the light source assembly 2 is arranged on the assembly fixing frame 16, a screw 17 is screwed into a screw hole of the assembly fixing frame 16 and penetrates through the assembly fixing frame 16, namely the screw 17 penetrates through the assembly fixing frame 16 and is in rotary connection with the assembly fixing frame 16, two ends of the screw 17 are in rotary connection with the inner wall of the box body 1, and a first sliding rod 30 and a second sliding rod 31 both penetrate through the assembly fixing frame 16 and then are connected with the inner wall of the box body 1, so that the assembly fixing frame 16 can slide along the first sliding rod 30 and the second; the screw 17 is connected with a first worm gear 18, a first servo motor 19 and a first worm 20 connected with the first servo motor 19 are arranged on the inner wall of the box body 1, a second servo motor 21 and a second worm 22 connected with the second servo motor 21 are arranged on the assembly fixing frame 16, the first worm 20 is rotationally connected with the first worm gear 18, the second worm 22 is rotationally connected with the diaphragm worm gear 15, the first servo motor 19 drives the first worm 20 to rotate, the first worm 20 drives the first worm gear 18 and the screw 17 to rotate, and the screw 17 drives the assembly fixing frame 16 to slide along a first slide rod 30 and a second slide rod 31, so that the light source 11 in the light source assembly 2 can move on a focal plane of the condenser lens 4; and the second servo motor 21 drives the second worm 22 to rotate, and the second worm 22 drives the diaphragm worm wheel 15 to rotate, so that the light transmission aperture of the adjustable diaphragm 12 is changed, namely the light emitting area of the light source 11 is changed.

The spectroscope 3 is adjustable in angle through a rotating mechanism, the rotating mechanism comprises a spectroscope fixing frame 23, the spectroscope 3 is fixed on the spectroscope fixing frame 23, the spectroscope fixing frame 23 is connected with a second worm wheel 24 through a spectroscope rotating shaft 27, two ends of the spectroscope rotating shaft 27 are rotatably connected to the inner wall of the box body 1, a third servo motor 25 and a third worm 26 connected with the third servo motor 25 are arranged in the box body 1, the third worm 26 is rotatably connected with the second worm wheel 24, the third servo motor 25 drives the third worm 26 to rotate, and the third worm 26 drives the second worm wheel 24 to rotate, so that the spectroscope 3 is.

The working process of the invention is as follows:

as shown in fig. 6, the bright field directional reflection fingerprint appears when the light source 11 emits light: moving an assembly fixing frame 16 to place the center of a central light source 28 in a light source assembly 2 at the focus of a collecting lens 4, rotating a spectroscope 3 to enable the optical axes of the spectroscope 3 and the collecting lens 4 to form 45 degrees, adjusting an adjustable diaphragm 12 to be as large as the central light source 28, turning on a light source 11 to enable the central light source 28 to emit light, converging light emitted by the light source assembly 2 through the collecting lens 4 to form approximately parallel light, reflecting the approximately parallel light through the spectroscope 3 to be approximately vertically irradiated to a fingerprint object at a material detection hole 7, enabling the surface of the smooth plane object at the material detection hole 7 to be equivalent to a mirror, enabling reflected light to be still approximately parallel light, transmitting the spectroscope 3, reflecting the reflected light through a first reflecting mirror 6 to enter an imaging objective lens 5 at the side, reflecting the reflected light through a second reflecting mirror 9 to a photographic hole 8, and imaging through a camera; and under the light irradiation of light source assembly 2, the reflected light of fingerprint lines on the object and the background pattern on the lower layer of the object surface has scattering property, and the light rays which finally enter the camera at the photographic hole 8 after transmitting through the spectroscope 3 are relatively less, the fingerprint lines are shown as dark lines with lower brightness than light background, and the background pattern is weakened. On the premise of not increasing the total height of the device, compared with the optical path length of the reflected light of the fingerprint object at the material detecting hole 7 directly reaching the top of the device, the optical path length of the imaging optical path reaching the top of the device after the two reflections of the first reflecting mirror 6 and the second reflecting mirror 9 is greatly prolonged. The light flux entering the camera at the position of the photographic hole 8 along with the extension of the optical path is greatly reduced because the reflected light of the fingerprint lines and the lower background pattern on the object surface is scattered light; because the reflected light on the surface of the smooth plane object is approximate parallel light, the light flux entering the camera at the photographic hole 8 is reduced little along with the extension of the optical path, so the contrast between the fingerprint lines and the light background is larger and the background pattern is better weakened due to the extension of the optical path of the imaging optical path. The illumination intensity of the fingerprint lines and the background pattern on the lower layer of the object surface can be further reduced by adjusting the clear aperture of the adjustable diaphragm 12, and the brightness of the central light source 28 is adjusted until the appearance effect of the fingerprint lines is optimal.

As shown in fig. 7, dark field directional reflection fingerprint appears in the light emitting state of the light source 11: the setting of each parameter is consistent with that of the bright field directional reflection fingerprint display in the embodiment, the bright field directional reflection fingerprint image is displayed first, the peripheral light source 29 is turned on, the adjustable diaphragm 12 is enlarged, the fingerprint object is irradiated by the light emitted by the peripheral light source 29 in the aperture of the adjustable diaphragm 12, the central light source 28 is turned off, the central light source 28 does not emit light, and the dark field directional reflection fingerprint image can be displayed in the camera at the photographic hole 8. Due to the turning off of the central light source 28, the parallel light vertically irradiating the smooth plane object is lost, so that the turned off central light source 28 is imaged as a dark background of a dark field; the fingerprint lines on the object are irradiated by the light emitted by the peripheral light source 29, the reflected light has scattering property, the light rays which enter the camera at the photographic hole 8 for imaging are relatively more, and the fingerprint lines are expressed as light-color lines with higher brightness than the dark-color background. Compared with the traditional dark field light distribution method, the LED lamp beads distributed annularly on the peripheral light source 29 replace a single point light source, and the incident angle of the incident light of the fingerprint object is smaller due to the smaller annular distribution diameter of the LED lamp beads, so that dark field imaging of the fingerprint has no bright spot interference, the line illumination is uniform, the contrast is better, and the brightness of the peripheral light source 29 is further adjusted until the fingerprint line showing effect is optimal.

As shown in fig. 6, the dark field fingerprint appears when the light source 11 is emitting: the parameters are consistent with the parameters of the bright field directional reflection fingerprint display in the embodiment, and a bright field directional reflection fingerprint image is displayed first. The center of a central light source 28 deviates from the focus of a condenser 4 by moving a light source assembly 2 or rotating the angle of a spectroscope 3, so that light emitted by the light source assembly 2 is converged by the condenser 4 to form approximately parallel light, the approximately parallel light is reflected by the spectroscope 3 and then obliquely irradiates a fingerprint object at a material detection hole 7, and due to the inclination of the irradiation angle, the approximately parallel light reflected by the surface of the smooth plane object is transmitted through the spectroscope 3 and finally reaches a camera at a photographic hole 8, so that the imaging of the surface of the smooth plane object is a dark background of a dark field; under the irradiation of oblique approximately parallel light, the reflected light of the fingerprint lines on the object has scattering property, the light rays entering the camera at the photographic hole 8 are 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 can be changed by further moving the position of the light source assembly 2 or rotating the angle of the spectroscope 3, the light flux can be changed by adjusting the clear aperture of the adjustable diaphragm 12, and the brightness of the central light source 28 is adjusted until the appearance effect of the fingerprint lines is optimal.

In conclusion, the photographic device obtains approximately parallel light through the matching of the light source assembly 2 and the condenser lens 4, 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, the light reflected by the fingerprint object under the irradiation of the central light source 28 reaches the photographic hole 8 after being reflected twice by the first reflector 6 and the second reflector 9, the optical path of an imaging optical path is prolonged, so that the contrast between a fingerprint line and an object background in a light field directional reflection mode is greatly enhanced, the interference of the object background pattern is weakened or even eliminated, and a high-quality light field directional reflection fingerprint image can be obtained; the light emitting area of the central light source 28 is controlled through the adjustable diaphragm 12 in the light source assembly 2, the area of a light-colored background outside a fingerprint area is reduced as much as possible, the illumination intensity of fingerprint lines and a lower-layer background pattern on the surface of an object is reduced, and the quality of a fingerprint image displayed by bright field directional reflection is better; by turning off the central light source 28 in the light source assembly 2 and turning on the peripheral light source 29, a dark field directional reflection fingerprint image different from the traditional dark field light distribution method can be obtained, and the dark field directional reflection fingerprint image has no bright spot interference, uniform line illumination and better contrast; by moving the light source assembly 2 or changing the angle of the spectroscope 3, a dark field image of the fingerprint can be obtained.

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. 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (9)

1. The utility model provides a portable fingerprint camera device of transmission 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 forms the illumination light path after the spectroscope reflects, be located illumination light path terminal 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 after the reflection passes through the spectroscope 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 process on the box of the light path terminal after the optical element reflection.

2. A transmission 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 transmission imaging portable fingerprint camera apparatus according to claim 2, wherein: the optical element is equipped with two, divide into first reflector, second reflector, formation of image objective sets up between first reflector and second reflector, just first reflector, second reflector all with the optical axis of formation of image objective is 45 contained angles and sets up.

4. A transmission imaging portable fingerprint camera apparatus according to claim 3, wherein: examine the material hole set up in the bottom of box, examine material hole and set gradually directly over the spectroscope, first reflector, the photograph hole set up in directly over the second reflector on the box, spectroscope side illumination light path sets gradually collecting mirror and light source.

5. A transmission 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. A transmission imaging portable fingerprint camera apparatus according to claim 2, 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 portable fingerprint camera device of 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, the first worm is connected with the first worm wheel in a rotating mode, 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.

8. A transmission imaging portable fingerprint camera apparatus according to claim 1, wherein: the spectroscope is adjustable in angle through a rotating mechanism.

9. A transmission imaging portable fingerprint camera apparatus according to claim 8, wherein: the rotating mechanism comprises a spectroscope fixing frame, the spectroscope is fixed on the spectroscope fixing frame, the spectroscope fixing frame is connected with a worm wheel two-way spectroscope rotating shaft, two ends of the spectroscope 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 three and a worm three connected with the servo motor three, and the worm three is rotatably connected with the worm wheel two.

Images