Line spectrum confocal imaging device based on coaxial principle

Abstract

The utility model relates to the related technical field of optical measurement, in particular to a line spectrum confocal imaging device based on the coaxial principle, which comprises a bottom plate with a plurality of mounting seats, a light source light path assembly, a light source light path assembly and a light source light path assembly, comprising a mounting frame arranged on one side of the bottom plate, a light source arranged on the mounting frame and a light equalizing pipe, and is used for providing a uniform and high-brightness wide-spectrum light source; the dispersion assembly comprises a slit I, a front group of dispersion lenses and a rear group of dispersion lenses which are arranged on the bottom plate and are sequentially arranged along the light path of the light source, and the dispersion assembly is used for performing dispersion on the light path emitted by the light source and the light equalizing tube, emitting the light path to an object and then reflecting the light path back; and the spectral imaging assembly comprises a front-group lens, a reflection diffraction light path, a middle-group lens, a rear-group lens and an imaging unit which are sequentially arranged along the light path of the beam splitter prism, and is used for imaging the light in the dispersion assembly through the imaging unit. According to the utility model, a line spectrum confocal imaging function based on a coaxial principle is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of optical measurement, and particularly relates to a line spectrum confocal imaging device based on the coaxial principle. Background Technique

[0002] The spectral confocal sensor is a newly emerging high-precision optical measurement device, which is a high-end ultra-precision instrument integrating high-end dispersion lenses, imaging spectrometers, high-speed imaging systems, and algorithms. The spectral confocal sensor has no special requirements for the surface of the object to be measured. It can detect almost all object surfaces such as mirrors, transparent, semi-transparent, black, and reflective, and solves the pain points and difficulties of optical 3D imaging sensors such as binocular cameras, monocular cameras, structured light cameras, and line lasers that cannot detect reflective, transparent, and black surfaces in principle.

[0003] The spectral confocal sensor involves knowledge in multiple aspects such as optics, algorithms, and high-speed image processing. Currently, there are line spectral sensors developed and produced based on the biaxial principle and line spectral sensors based on the coaxial principle. However, the line spectral sensor based on the coaxial principle has the disadvantages of low brightness, short line length, small measurement range, and great difficulty in installation and adjustment.

[0004] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is the closest prior art. Content of the Utility Model

[0005] The purpose of the utility model is to solve the above deficiencies and provide a line spectrum confocal imaging device based on the coaxial principle.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme: A line spectrum confocal imaging device based on the coaxial principle, including a bottom plate with a plurality of mounting seats, a beam splitting prism is arranged on the bottom plate, and further includes:

[0007] A light source optical path component, including a mounting frame arranged on one side of the bottom plate, a light source and a light homogenizing tube arranged on the mounting frame, for providing a uniform and high-brightness broadband light source;

[0008] A dispersion component, including a slit 1, a front group of dispersion lenses, and a rear group of dispersion lenses arranged on the bottom plate in sequence along the light source optical path, for dispersing the optical path emitted by the light source and the light homogenizing tube, then shooting it onto the object and reflecting it back;

[0009] A spectral imaging component, including a front group of lenses, a reflection diffraction optical path, a middle group of lenses, a rear group of lenses, and an imaging unit arranged in sequence along the beam splitting prism optical path, for imaging the light in the dispersion component through the imaging unit.

[0010] Further, the front group of dispersion lenses includes an S lens group 1, an S lens group 2, an S lens group 3, and an S lens group 4 arranged in sequence along the optical path;

[0011] The first washer is disposed between the first S lens group and the second S lens group and is used to adjust the air interval between the first S lens group and the second S lens group;

[0012] The second washer is disposed between the second S lens group and the third S lens group and is used to adjust the air interval between the second S lens group and the third S lens group;

[0013] The third washer is disposed between the third S lens group and the fourth S lens group and is used to adjust the air interval between the third S lens group and the fourth S lens group.

[0014] Further, the rear group dispersion lens includes a fifth S lens group, a sixth S lens group and a seventh S lens group which are sequentially disposed along the optical path;

[0015] The fourth washer is disposed between the fifth S lens group and the sixth S lens group and is used to adjust the air interval between the lens groups;

[0016] The fifth washer is disposed between the sixth S lens group and the seventh S lens group and is used to adjust the air interval between the lens groups.

[0017] Further, the front group lens includes a first G lens group, a second G lens group and a third G lens group which are sequentially disposed along the optical path;

[0018] The second slit is disposed between the first G lens group and the beam splitting prism and is used as the object surface of the system;

[0019] The sixth washer is disposed between the second slit and the first G lens group and is used to ensure that the second slit is at the object surface of the system;

[0020] The seventh washer is disposed between the first G lens group and the second G lens group and is used to adjust the air interval between the lens groups;

[0021] The eighth washer is disposed between the second G lens group and the third G lens group and is used to adjust the air interval between the lens groups.

[0022] Further, the reflection diffraction optical path includes a reflecting mirror group and a grating disposed on the base plate;

[0023] The reflecting mirror group mounting seat is disposed at the bottom of the reflecting mirror group and is provided with a ninth washer for adjusting the position of the reflecting mirror group;

[0024] The grating fixing seat is disposed at the bottom of the grating and is provided with a tenth washer for adjusting the front and rear positions of the grating.

[0025] Further, the middle group lens includes a fourth G lens group, a fifth G lens group and a sixth G lens group which are sequentially disposed along the optical path;

[0026] The eleventh washer is disposed between the fourth G lens group and the fifth G lens group and is used to adjust the air interval between the lens groups;

[0027] The washer twelve is arranged between the G lens group five and the G lens group six and is used to adjust the air interval between the lens groups.

[0028] Further, the rear lens group includes a G lens group seven, a G lens group eight, and a G lens group nine arranged in sequence along the optical path;

[0029] The washer thirteen is arranged between the G lens group seven and the G lens group eight and is used to adjust the air interval between the lens groups;

[0030] The washer fourteen is arranged between the G lens group eight and the G lens group nine and is used to adjust the air interval between the lens groups;

[0031] The light shielding member is threadedly locked on the outer lens barrel of the combination of the G lens group seven, the G lens group eight, and the G lens group nine.

[0032] Further, the imaging unit includes a sensor board, and an installation block connected to the bottom board is arranged on the sensor board; the installation block is used to install and fix the sensor board and conduct heat dissipation for the sensor board.

[0033] Further, a radiator for conducting heat dissipation for the light source is arranged on the mounting rack.

[0034] Further, the washer fifteen is arranged outside the lens barrel where the G lens group two is located and at the corresponding mounting seat on the bottom board, and is used to ensure that the slit one of the dispersion component and the slit two of the spectral imaging component are axially conjugate.

[0035] Compared with the prior art, the utility model has the following beneficial effects: by setting the light source optical path component, the dispersion component, and the spectral imaging component, under the action of the dispersion component, the color-dispersed optical path provided for the system is both an emission optical path and a recovery optical path. The color-dispersed light is emitted from the lens to the object and then reflected back to the dispersion component, and after passing through the beam splitter prism, it is turned 90° and incident on the spectral imaging component. The spectral imaging component forms an image of the light in the dispersion lens through the imaging unit, realizing the line spectral confocal imaging function of the coaxial principle; in addition, the slit one of the dispersion component and the slit two of the spectral imaging component are in a conjugate relationship. The axial conjugation is ensured by adjusting the thickness of the washer fifteen, and the angular conjugation is ensured by rotating the front lens group in the spectral imaging component, thereby completing the conjugate alignment of the slits; and through the slit one of the dispersion component, most of the light can be blocked, and only part of the light passes through the slit of the slit one. Therefore, the smaller the light-emitting surface of the light source, the higher the energy density, and the higher the light transmittance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The specification drawings forming a part of this application are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation to the utility model. In the drawings:

[0037] Figure 1 Internal overall assembly plane structure diagram of an embodiment of the present utility model;

[0038] Figure 2 Front view plane structure diagram of the overall of an embodiment of the present utility model;

[0039] Figure 3 Light source and its lamp bead arrangement distribution diagram of an embodiment of the present utility model.

[0040] In the figure: 11, bottom plate; 12, beam splitting prism; 13, washer fifteen; 21, mounting bracket; 22, light source; 23, light homogenizing tube; 24, radiator; 31, slit one; 32, front group dispersion lens; 3201, S lens group one; 3202, S lens group two; 3203, S lens group three; 3204, S lens group four; 3205, washer one; 3206, washer two; 3207, washer three; 33, rear group dispersion lens; 3301, S lens group five; 3302, S lens group six; 3303, S lens group seven; 3304, washer four; 3305, washer five; 41, front group lens; 4101, G lens group one; 4102, G lens group two; 4103, G lens group three; 4104, slit two; 4105, washer six; 4106, washer seven; 4107, washer eight; 4108, diaphragm; 42, reflection diffraction optical path; 4201, mirror group; 4202, grating; 4203, mirror group mounting seat; 4204, washer nine; 4205, grating fixing seat; 4206, washer ten; 43, middle group lens; 4301, G lens group four; 4302, G lens group five; 4303, G lens group six; 4304, washer eleven; 4305, washer twelve; 44, rear group lens; 4401, G lens group seven; 4402, G lens group eight; 4403, G lens group nine; 4404, washer thirteen; 4405, washer fourteen; 4406, light shielding member; 45, imaging unit; 4501, sensor board; 4502, mounting block. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present utility model will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0042] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0043] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, "a plurality of" means more than two. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0044] As Figures 1-3 shown, a line spectral confocal imaging device based on the coaxial principle of the present utility model includes a bottom plate 11 having a plurality of mounting seats, a beam splitting prism 12 is arranged on the bottom plate 11, and further includes:

[0045] A light source optical path assembly, including a mounting frame 21 arranged on one side of the bottom plate 11, a light source 22 and a light homogenizing tube 23 arranged on the mounting frame 21, for providing a uniform and high-brightness broadband light source;

[0046] A dispersion assembly, arranged on the bottom plate 11 and including a slit 31, a front group of dispersion lenses 32, and a rear group of dispersion lenses 33 arranged in sequence along the optical path of the light source 22, for dispersing the optical path emitted by the light source 22 and the light homogenizing tube 23, then emitting it onto an object and reflecting it back;

[0047] A spectral imaging assembly, including a front group of lenses 41, a reflection and diffraction optical path 42, a middle group of lenses 43, a rear group of lenses 44, and an imaging unit 45 arranged in sequence along the optical path of the beam splitting prism 12, for imaging the light in the dispersion assembly through the imaging unit 45. Designed in this way, by using a method including but not limited to screws on the corresponding mounting seats of the bottom plate 11 such as Figure 2A distribution-fixed beam-splitting prism 12, a light source optical path component, a dispersion component, and a spectral imaging component. Under the action of the dispersion component, the chromatic light path provided by the light source optical path component for the system to enter the dispersion component is both an emission optical path and a recycling optical path. The dispersed light is emitted from the lens to an object and then reflected back to the dispersion component. After passing through the beam-splitting prism, it is turned 90° and incident on the spectral imaging component. The spectral imaging component forms an image of the light in the dispersion lens through the imaging unit.

[0048] It should be noted that the light source 22 is a linear light source composed of multiple small light-emitting surfaces and high-energy-density lamp beads; the light homogenizing tube 23 is a light homogenizing optical path, and after the light source 22 passes through the light homogenizing tube 23, a uniform bright line is formed.

[0049] It should be noted that in the dispersion component, the slit 31 as the object surface of the system needs to be axially and air-spacing positioned with the dispersion lens group. The axial positioning can be achieved by mating the mounting seat on the bottom plate 11 with the dispersion lens group, and the air spacing is realized by adjusting the thickness of the washer.

[0050] In one embodiment, the front group dispersion lens 32 includes an S lens group 3201, an S lens group 3202, an S lens group 3203, and an S lens group 3204 arranged in sequence along the optical path;

[0051] A washer 3205 is arranged between the S lens group 3201 and the S lens group 3202, and is used to grind and adjust the thickness of the washer 3205 to ensure the air spacing between the S lens group 3201 and the S lens group 3202;

[0052] A washer 3206 is arranged between the S lens group 3202 and the S lens group 3203, and is used to grind and adjust the thickness of the washer 3206 to ensure the air spacing between the S lens group 3202 and the S lens group 3203;

[0053] A washer 3207 is arranged between the S lens group 3203 and the S lens group 3204, and is used to grind and adjust the thickness of the washer 3207 to ensure the air spacing between the S lens group 3203 and the S lens group 3204. With such a design, by designing a lens barrel member outside the lens group combined with the S lens group 3201, the S lens group 3202, the S lens group 3203, and the S lens group 3204, and after centering and processing the S lens group 3202, the S lens group 3203, and the S lens group 3204 and fitting them, they are installed at the corresponding positions in the lens barrel. Also, by sequentially designing washers 3205, 3206, and 3207 with adjustable thicknesses between adjacent lens groups, the air spacing between the lens groups can be ensured, the effective focal length and optical characteristics of the lens group can be changed, the thermal stress and mechanical stress of the optical system can be reduced, and the stability and long-term reliability of the system can be enhanced.

[0054] It should be noted that each of the S lens groups 3201, 3202, 3203, and 3204 consists of a lens + a lens frame + a retaining ring. The lens is installed in the lens frame and fixed by the retaining ring or by injecting glue through the glue injection hole. A certain machining allowance is reserved for the outer diameter of each lens group, and the centering machining method is required to ensure that the optical center coincides with the mechanical axis of the lens frame.

[0055] In one embodiment, the rear group dispersion lens 33 includes an S lens group five 3301, an S lens group six 3302, and an S lens group seven 3303 that are sequentially arranged along the optical path;

[0056] A washer four 3304 is arranged between the S lens group five 3301 and the S lens group six 3302 and is used to grind and adjust the thickness of the washer four 3304 to ensure the air gap between the lens groups;

[0057] A washer five 3305 is arranged between the S lens group six 3302 and the S lens group seven 3303 and is used to grind and adjust the thickness of the washer five 3305 to ensure the air gap between the lens groups. With this design, the air gap is adjusted and ensured by using the ground washer thickness between the lens groups.

[0058] It should be noted that each of the S lens group five 3301, the S lens group six 3302, and the S lens group seven 3303 is a lens group with a lens frame. The lens is installed in the lens frame and fixed by the retaining ring or the dispensing method. At the same time, after the installed lens frame is centered by a centering machine tool, the optical center of the lens group is transferred to the mechanical axis of the lens frame, and the air gap between the lens groups is adjusted by grinding the corresponding gaskets.

[0059] Preferably, the front group dispersion lens 32 and the rear group dispersion lens 33 are assembled to form a complete optical lens. However, it is necessary to ensure the air gap and the axial positioning accuracy between the S lens group four 3204 and the S lens group five 3301. By respectively measuring the distances from the optical vertices of the S lens group one 3201 and the S lens group five 3301 to the mounting surface, the air gap is ensured by grinding the washer.

[0060] In one embodiment, the front group lens 41 includes a G lens group one 4101, a G lens group two 4102, and a G lens group three 4103 that are sequentially arranged along the optical path;

[0061] A slit two 4104 is arranged between the G lens group one 4101 and the beam splitter prism 12 and is used as the object surface of the system;

[0062] A washer six 4105 is arranged between the slit two 4104 and the G lens group one 4101 and is used to grind the washer six 4105 to ensure the slit two 4104 is at the object surface of the system;

[0063] The seventh washer 4106 is arranged between the first G lens group 4101 and the second G lens group 4102, and is used to grind and adjust the thickness of the seventh washer 4106 to ensure the air gap between the lens groups;

[0064] The eighth washer 4107 is arranged between the second G lens group 4102 and the third G lens group 4103, and is used to grind and adjust the thickness of the eighth washer 4107 to ensure the air gap between the lens groups;

[0065] The diaphragm 4108 is arranged at the second slit 4104 and is used for light-shielding function. With such a design, the thickness determined by grinding between the second slit 4104 and the first G lens group 4101 ensures that the second slit 4104 is on the object plane of the system, and at the same time, the air gap between adjacent lens groups is also adjusted by grinding the corresponding washers.

[0066] It should be noted that the first G lens group 4101, the second G lens group 4102, and the third G lens group 4103 are all lens groups with lens frames, where the lenses are installed in the lens frames and fixed by pressing rings or dispensing; after the installed lens frames are centered and processed by a centering machine tool, the optical centers of the lens groups are transferred to the mechanical axes of the lens frames, and the air gap between the lens groups is adjusted by grinding the corresponding washers.

[0067] In one embodiment, the reflection and diffraction optical path 42 includes a reflecting mirror group 4201 and a grating 4202 arranged on the bottom plate 11;

[0068] The reflecting mirror group mounting seat 4203 is arranged at the bottom of the reflecting mirror group 4201, and a ninth washer 4204 for adjusting the position of the reflecting mirror group 4201 is arranged thereon;

[0069] The grating fixing seat 4205 is arranged at the bottom of the grating 4202, and a tenth washer 4206 for adjusting the front and rear positions of the grating 4202 is arranged thereon. With such a design, the reflecting mirror group mounting seat 4203 is fixed on the bottom plate 11 by using positioning pins, and the reflecting mirror group mounting seat 4203 and the reflecting mirror group 4201 are fixed by pasting, and a ninth washer 4204 is designed in the middle to adjust the position of the reflecting mirror group 4201 in the system;

[0070] The grating fixing seat 4205 fixed on the bottom plate 11 by positioning pins in the same way, and the tenth washer 4206 outside the grating 4202 fixed on the grating fixing seat 4205 can adjust and determine the front and rear positions of the grating 4202 in the system.

[0071] In one embodiment, the middle group lens 43 includes a fourth G lens group 4301, a fifth G lens group 4302, and a sixth G lens group 4303 arranged in sequence along the optical path;

[0072] The washer eleven 4304 is arranged between the G lens group four 4301 and the G lens group five 4302, and is used to grind and adjust the thickness of the washer eleven 4304 to ensure the air gap between the lens groups;

[0073] The washer twelve 4305 is arranged between the G lens group five 4302 and the G lens group six 4303, and is used to grind and adjust the thickness of the washer twelve 4305 to ensure the air gap between the lens groups. With this design, by using grindable washers between the corresponding lens groups to adjust the air gap, the effective focal length and optical characteristics of the lens groups can be changed, and the thermal stress and mechanical stress of the optical system can also be reduced, enhancing the stability and long-term reliability of the system.

[0074] It should be noted that the G lens group four 4301, the G lens group five 4302, and the G lens group six 4303 are all lens groups with lens frames, where the lenses are installed in the lens frames and fixed by snap rings or gluing; after the installed lens frames are centered and processed by a centering machine tool, the optical centers of the lens groups are transferred to the mechanical axes of the lens frames, and the air gap between the lens groups is adjusted by grinding the corresponding washers.

[0075] In one embodiment, the rear lens group 44 includes the G lens group seven 4401, the G lens group eight 4402, and the G lens group nine 4403 arranged in sequence along the optical path;

[0076] The washer thirteen 4404 is arranged between the G lens group seven 4401 and the G lens group eight 4402, and is used to grind and adjust the thickness of the washer thirteen 4404 to ensure the air gap between the lens groups;

[0077] The washer fourteen 4405 is arranged between the G lens group eight 4402 and the G lens group nine 4403, and is used to grind and adjust the thickness of the washer fourteen 4405 to ensure the air gap between the lens groups;

[0078] The light-shielding member 4406 is threadedly locked on the outer lens barrel of the combination of the G lens group seven 4401, the G lens group eight 4402, and the G lens group nine 4403. With this design, the air gap is ensured by the washers fixed between the corresponding lens groups.

[0079] It should be noted that the G lens group seven 4401, the G lens group eight 4402, and the G lens group nine 4403 are all lens groups with lens frames, where the lenses are installed in the lens frames and fixed by snap rings or gluing; after the installed lens frames are centered and processed by a centering machine tool, the optical centers of the lens groups are transferred to the mechanical axes of the lens frames, and the air gap between the lens groups is adjusted by grinding the corresponding washers.

[0080] In one embodiment, the imaging unit 45 includes a sensor board 4501, and an installation block 4502 connected to the bottom board 11 is arranged on the sensor board 4501; the installation block 4502 is used for installing and fixing the sensor board 4501 and conducting heat dissipation for the sensor board 4501. With such a design, the installation block 4502 is fixed on the bottom board 11 by using a positioning pin, and the sensor board 4501 is fixed on the installation block 4502, so as to perform subsequent installation and fixing operations and provide good heat conduction and heat dissipation effects when the sensor board 4501 is running.

[0081] It should be noted that the front lens group 41, the reflection and diffraction optical path 42, the middle lens group 43, the rear lens group 44, and the imaging unit 45 are all based on the bottom board 11, and are fixed in sequence including but not limited to the positioning pin method to Figure 2 distribute and fix the front lens group 41, the reflection and diffraction optical path 42, the middle lens group 43, the rear lens group 44, and the imaging unit 45 in sequence to achieve the coaxial effect. Among them, the air gap between adjacent structures and the determination of the spatial position in the system can both be determined by grinding the thickness of the corresponding washer.

[0082] In one embodiment, a radiator 24 for conducting heat dissipation for the light source 22 is arranged on the mounting bracket 21. With such a design, the radiator 24 is fixed on the mounting bracket 21 by using bolts, which can dissipate heat for the light source 22, and the intermediate gap can be filled with thermal grease for heat conduction.

[0083] In one embodiment, the fifteenth washer 13 is arranged outside the lens barrel where the second G lens group 4102 is located and at the corresponding mounting seat on the bottom board 11, and is used to ensure that the slit 1 of the dispersion component and the slit 2 of the spectral imaging component are axially conjugate by adjusting its thickness.

[0084] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A line spectrum confocal imaging device based on the coaxial principle, comprising a base plate (11) having a plurality of mounting seats, wherein a beam splitter prism (12) is arranged on the base plate (11), characterized in that: Also includes: The light source optical path component comprises a mounting frame (21) arranged on one side of a base plate (11), a light source (22) and a light averaging tube (23) arranged on the mounting frame (21), and is used to provide a uniform, high-brightness, wide-spectrum light source; A dispersion component, comprising a slit 1 (31), a front dispersion lens (32), and a rear dispersion lens (33) arranged on a bottom plate (11) and arranged in sequence along the optical path of the light source (22), and used to disperse the light emitted by the light source (22) and the light averaging tube (23), emit the light onto an object, and then reflect the light back into the object; The spectral imaging component comprises a front lens group (41), a reflection diffraction optical path (42), a middle lens group (43), a rear lens group (44) and an imaging unit (45) which are sequentially arranged along the optical path of a beam splitter prism (12), and is used for imaging the light in the dispersion component through the imaging unit (45).

2. The line spectrum confocal imaging device based on the coaxial principle according to claim 1, characterized in that: The front group dispersion lens (32) comprises an S mirror group 1 (3201), an S mirror group 2 (3202), an S mirror group 3 (3203) and an S mirror group 4 (3204) which are arranged in sequence along the optical path; Gasket 1 (3205), disposed between S mirror group 1 (3201) and S mirror group 2 (3202), for adjusting the air gap between S mirror group 1 (3201) and S mirror group 2 (3202); Gasket 2 (3206), disposed between S mirror group 2 (3202) and S mirror group 3 (3203), for adjusting the air gap between S mirror group 2 (3202) and S mirror group 3 (3203); Gasket three (3207) is arranged between S mirror group three (3203) and S mirror group four (3204), and is used to adjust the air gap between S mirror group three (3203) and S mirror group four (3204).

3. The line spectrum confocal imaging device based on the coaxial principle according to claim 1, characterized in that: The rear group dispersion lens (33) comprises an S mirror group five (3301), an S mirror group six (3302) and an S mirror group seven (3303) which are arranged in sequence along the optical path; Gasket 4 (3304), disposed between S mirror group 5 (3301) and S mirror group 6 (3302), for adjusting the air gap between the mirror groups; Gasket five (3305) is arranged between S mirror group six (3302) and S mirror group seven (3303) and is used to adjust the air gap between the mirror groups.

4. The line spectrum confocal imaging device based on the coaxial principle according to claim 1, characterized in that: The front lens group (41) comprises a G lens group 1 (4101), a G lens group 2 (4102) and a G lens group 3 (4103) which are sequentially arranged along the optical path; Slit 2 (4104), arranged between G lens group 1 (4101) and the beam splitter prism (12), used as the object plane of the system; Gasket six (4105), disposed between slit two (4104) and G lens group one (4101), for ensuring that slit two (4104) is on the object plane of the system; Gasket seven (4106), disposed between G lens group one (4101) and G lens group two (4102), for adjusting the air gap between the lens groups; Gasket 8 (4107), disposed between G lens group 2 (4102) and G lens group 3 (4103), for adjusting the air gap between the lens groups; The aperture (4108) is arranged at the slit 2 (4104) to serve as a light shielding function.

5. The line spectrum confocal imaging device based on the coaxial principle according to claim 1, characterized in that: The reflective diffraction optical path (42) comprises a reflective mirror group (4201) and a grating (4202) arranged on a base plate (11); A reflector assembly mounting seat (4203), which is arranged at the bottom of the reflector assembly (4201) and is provided with a washer nine (4204) for adjusting the position of the reflector assembly (4201); The grating fixing seat (4205) is arranged at the bottom of the grating (4202) and is provided with a gasket ten (4206) for adjusting the front and rear position of the grating (4202).

6. The line spectrum confocal imaging device based on the coaxial principle according to claim 1, characterized in that: The middle lens group (43) comprises a G lens group four (4301), a G lens group five (4302), and a G lens group six (4303) which are sequentially arranged along the optical path; Gasket 11 (4304), disposed between G lens group 4 (4301) and G lens group 5 (4302), for adjusting the air gap between the lens groups; Gasket twelve (4305) is arranged between G lens group five (4302) and G lens group six (4303) and is used to adjust the air gap between the lens groups.

7. The line spectrum confocal imaging device based on the coaxial principle according to claim 1, characterized in that: The rear lens group (44) comprises a G lens group seven (4401), a G lens group eight (4402), and a G lens group nine (4403) which are sequentially arranged along the optical path; Gasket 13 (4404), disposed between G lens group 7 (4401) and G lens group 8 (4402), for adjusting the air gap between the lens groups; Gasket 14 (4405), disposed between G lens group 8 (4402) and G lens group 9 (4403), for adjusting the air gap between the lens groups; The light shielding member (4406) is threadedly locked and arranged on the outer lens barrel of the combination of the G lens group seven (4401), the G lens group eight (4402), and the G lens group nine (4403).

8. The line spectrum confocal imaging device based on the coaxial principle according to claim 1, characterized in that: The imaging unit (45) comprises a sensor board (4501), and the sensor board (4501) is provided with a mounting block (4502) connected to the bottom board (11); the mounting block (4502) is used to mount and fix the sensor board (4501) and to conduct heat and dissipate heat from the sensor board (4501).

9. The line spectrum confocal imaging device based on the coaxial principle according to claim 1, characterized in that: The mounting frame (21) is provided with a heat sink (24) for conducting heat and dissipating heat for the light source (22).

10. The line spectrum confocal imaging device based on the coaxial principle according to claim 4, characterized in that: Gasket fifteen (13) is arranged outside the lens barrel where the G lens group two (4102) is located and at the corresponding mounting seat on the bottom plate (11), and is used to ensure that the slit one (31) of the dispersion component and the slit two (4104) of the spectral imaging component are axially conjugated.

Images