Parallel coaxial light source

Abstract

The utility model provides a parallel coaxial light source which comprises a shell, a mounting cavity is arranged in the shell, the mounting cavity comprises a first cavity and a second cavity which are communicated with each other, a lamp bead is arranged in the first cavity, a spectroscope and a light outlet are arranged in the second cavity, and a convex lens is arranged at the communication position of the first cavity and the second cavity. A cover cylinder is further arranged in the first cavity, the lamp beads are arranged in the cover cylinder, the end of the cover cylinder extends towards the convex lens and is provided with an installation hole, and a light uniformizing piece is arranged at the installation hole. Through the combination of the dodging sheet and the convex lens, the problems that a traditional parallel coaxial light source is uneven in light spot, large in energy loss and poor in adaptability are solved, and the parallel coaxial light source is particularly suitable for high-precision machine vision detection scenes and has remarkable technical advantages and market competitiveness.

Description

TECHNICAL FIELD

[0001] The utility model belongs to parallel light source technical field, concretely relates to a parallel coaxial light source. BACKGROUND

[0002] In the field of machine vision, the parallel coaxial light source is one of the core components to realize high-precision surface detection, and the spot uniformity directly affects the imaging quality and detection accuracy; the existing parallel coaxial light source is usually composed of a light-emitting lamp bead, a Finnel lens, a beam splitter and a shell, wherein the Finnel lens converts the divergent light beam into approximate parallel light through the refraction principle, however, the stepped structure of the Finnel lens is easy to cause light path distortion, and the light-emitting angle of the lamp bead does not match the lens well, which causes obvious brightness attenuation of the spot edge, large difference between the center and the edge of the light intensity, and energy loss caused by multiple refraction and reflection in the light path, which needs to be compensated by increasing the power of the lamp bead, increasing the power consumption and heat dissipation burden; at the same time, the fixed focal length of the traditional Finnel lens cannot adapt to the needs of different detection distances, and the flexibility is poor, which limits the application of the parallel coaxial light source in high-precision detection scenes, therefore, a technical scheme capable of optimizing the light path design and significantly improving the spot uniformity is urgently needed. SUMMARY

[0003] (1) Technical problem to be solved

[0004] The utility model provides a parallel coaxial light source, aims at solving the problem of imperfect light path design and insufficient spot uniformity.

[0005] (2) Technical scheme

[0006] The utility model provides a parallel coaxial light source, including the shell, be equipped with the installation cavity in the shell, the installation cavity includes cavity one and chamber two who intercommunicate, be equipped with the lamp bead in the cavity one, be equipped with the beam splitter and the light outlet in the chamber two, the intercommunication department of the cavity one with chamber two is equipped with the convex lens;

[0007] Among them, the cavity one is equipped with the cover cylinder still, the lamp bead is arranged in the cover cylinder, the end of the cover cylinder extends to the direction of the convex lens and is equipped with the mounting hole, the mounting hole is equipped with the uniform light piece.

[0008] Further, the uniform light piece includes a fixed part and a light-transmitting part, the end of the cover cylinder is provided with a fixed surface, the light-transmitting part covers the mounting hole, and the fixed part is fixedly connected with the fixed surface.

[0009] Further, the end of the cover cylinder is provided with a convex edge extending outward, and the thickness H1 of the convex edge is equal to the thickness H2 of the uniform light piece.

[0010] Further, the uniform light piece is a microstructure diffusion sheet or a frosted optical sheet.

[0011] Furthermore, the light-diffusing plate is located at the focal point of the convex lens.

[0012] Furthermore, the focal point of the lamp bead and the focal point of the convex lens are located on the same horizontal line.

[0013] Furthermore, it also includes a power cord, and the peripheral wall of the cover is provided with a connection hole, through which the power cord passes and connects to the lamp bead.

[0014] Furthermore, the second chamber is also provided with an observation port that is opposite to the light outlet.

[0015] Furthermore, the optical axis of the convex lens is at a 45° angle to the normal of the beam splitter.

[0016] Furthermore, the inner wall of the housing is coated with a high-reflectivity coating.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] By combining a cavity design, a light homogenizer, and a custom convex lens, the problems of uneven light spot, large energy loss, and poor adaptability of traditional parallel coaxial light sources are solved. It is especially suitable for high-precision machine vision inspection scenarios and has significant technical advantages and market competitiveness. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the cover connection of this utility model.

[0021] Figure 3 This is an exploded view of the cover, lamp beads, and light diffuser of this utility model.

[0022] Figure 4 This is a schematic diagram of the light-diffusing sheet structure of this utility model.

[0023] Figure 5 This is a schematic diagram showing the positional relationship of the beam splitter of this utility model.

[0024] Figure 6 This is a schematic diagram illustrating the use of this utility model.

[0025] Reference numerals in the attached drawings: 1-Housing shell, 2-Mounting cavity, 21-Cavity 1, 211-Cover, 2111-Fixing surface, 212-Mounting hole, 213-Protruding edge, 214-Connecting hole, 215-Lamp board, 216-Circuit board, 22-Cavity 2, 221-Light outlet, 222-Observation port, 3-Lamp bead, 4-Beam splitter, 5-Convex lens, 6-Light diffuser, 61-Fixing part, 62-Light transmission part, 7-Power cord. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described in connection with the drawings in the embodiments of the utility model.

[0027] As Figures 1-6 shown, the utility model discloses a parallel coaxial light source, including casing 1, be equipped with installation cavity 2 in casing 1, installation cavity 2 includes the chamber one 21 and chamber two 22 that intercommunication, be equipped with lamp pearl 3 in chamber one 21, be equipped with beam splitter 4 and light outlet 221 in chamber two 22, the intercommunication place of chamber one 21 with chamber two 22 is equipped with convex lens 5, the parallel illumination beam for projecting to object is usually used with Fini lens in prior art, but when adopting Fini lens, it is easy to cause the light board edge luminance attenuation, the case of big difference between center and edge light intensity, simultaneously, the fixed focal length of traditional Fini lens is difficult to adapt the demand of different detection distance, and the flexibility is poor, the utility model adopts convex lens 5 to replace Fini lens, and the light of lamp pearl 3 is parallelly irradiated to beam splitter 4, because the surface of convex lens 5 is continuous smooth curved surface, the light refraction process is uniform, avoids the local light path distortion caused by the stepped structure of Fini lens, and the focal length and curvature of convex lens 5 can be customized according to demand, adapt to different detection distance, reduce the edge light intensity weakening, improve the collimation of parallel light, wherein, chamber one 21 is also equipped with cover cylinder 211, lamp pearl 3 is arranged in cover cylinder 211, the end of cover cylinder 211 extends towards convex lens 5 and is equipped with mounting hole 212, and uniform light sheet 6 is arranged at mounting hole 212, in order to significantly improve the uniformity of light spot, solve the phenomenon that the center is bright and the edge is dark in traditional light source, the utility model adds uniform light sheet 6, suppresses stray light generated by beam splitter 4 or the reflection inside casing 1 through the scattering effect of uniform light sheet 6, improves the imaging definition, when using, the light emitted by lamp pearl 3 is guided to uniform light sheet 6 through cover cylinder 211, collimated as parallel light by customized convex lens 5 after diffusion, parallel light is incident on beam splitter 4, and transmitted to light outlet 221 for illumination, through the combination of uniform light sheet 6, convex lens 5 and beam splitter 4, the parallelization and uniform diffusion of light are realized.

[0028] Specifically, as Figures 2-3As shown, due to the light emitted by the lamp beads 3 may be randomly reflected and scattered in the cavity 21, resulting in uneven light spot, the cover tube 211 is used to cover the lamp beads 3, the light propagates according to a relatively regular path, and the fixing of the light uniformity sheet 6 is realized. To some extent, the constraint and guidance of the cover tube 211 on the light can help to improve the uniformity of the light spot. The cover tube 211 can effectively collect and guide the light emitted by the lamp beads 3, so that the light propagates more concentratedly towards the light uniformity sheet 6, avoids the scattering and irregular divergence of the light, improves the utilization rate of the light, ensures that more light can be subjected to diffusion and uniformization treatment by the light uniformity sheet 6, and then enters the subsequent optical elements, realizes the parallelization and uniform diffusion of the light, and improves the optical performance and lighting effect of the overall light source. At the same time, the cover tube 211 provides a relatively closed and stable protection environment for the lamp beads 3, which can prevent the lamp beads 3 from being disturbed and damaged by external factors, effectively prolongs the service life of the lamp beads 3, reduces the maintenance cost and replacement frequency of the light source. At the same time, in the working process of the light source, the lamp beads 3 will generate a certain amount of heat, and the cover tube 211 is usually made of a material with good heat conduction performance, which can conduct the heat generated by the lamp beads 3 away and dissipate heat through heat exchange with the surrounding air, reduce the working temperature of the lamp beads 3, and ensure the stable operation of the light source.

[0029] Further, the light uniformity sheet 6 includes a fixed part 61 and a light-transmitting part 62, the end of the cover tube 211 is provided with a fixed surface 2111, the light-transmitting part 62 covers the mounting hole 212, and the fixed part 61 is fixedly connected with the fixed surface 2111. This design ensures that the light uniformity sheet 6 is stably installed and accurately covers the light path, and will not be easily loosened or displaced, ensuring the stability of the light path and accurately diffusing and uniformizing the light, avoiding the waste and unnecessary loss of light, and improving the utilization efficiency of the light source.

[0030] Further, the end of the cover cylinder 211 is provided with an outwardly extending flange 213, the thickness H1 of the flange 213 is equal to the thickness H2 of the light uniforming sheet 6, the light transmitting part 62 is installed in the space enclosed by the flange 213, during installation, the flange 213 can be tightly fitted with the light uniforming sheet 6, providing a precise positioning reference for the light uniforming sheet 6, ensuring the accurate position of the light uniforming sheet 6 in the light path, avoiding abnormal light propagation caused by position deviation, ensuring that the light can accurately pass through the diffusion and uniformization processing of the light uniforming sheet 6, this design makes the installation of the light uniforming sheet 6 more convenient, without the need for additional complex positioning devices or precise measuring tools, just align and fix the light uniforming sheet 6 with the flange 213, reducing the installation difficulty and cost, improving the production efficiency, at the same time, the equal thickness makes the flange 213 and the light uniforming sheet 6 form a good sealing effect, reducing the light leakage from the gap between them, ensuring that more light can propagate and process according to the predetermined light path, improving the utilization efficiency of the light source and enhancing the lighting effect.

[0031] Preferably, the light uniforming sheet 6 is a micro-structured diffusion sheet or a frosted optical sheet.

[0032] Further, the light uniforming sheet 6 is located at the focal point of the convex lens 5, the light uniforming sheet 6 located at the focal point can ensure that more light passes through it after diffusion and enters the effective focal length range of the convex lens 5, reducing the waste of light, compared with the case where the light uniforming sheet 6 is not at the focal point, this design can make the light more concentrated through the processing of the convex lens 5, improving the overall brightness and lighting effect of the light source, and also helps to improve the clarity and accuracy of subsequent detection or imaging, effectively controlling and optimizing the shape and size of the final formed light spot.

[0033] The focal point of the lamp bead 3 and the convex lens 5 is located on the same horizontal line, the collimated parallel light can provide more uniform illumination for the object, reducing the imaging blur and distortion caused by uneven light, when the lamp bead 3 is located at the focal point of the convex lens 5, the emitted light after collimation can be more accurately irradiated to the object surface, so that each part of the object can be fully and uniformly illuminated, thereby improving the clarity and detail performance of the imaging, which is beneficial to more accurate detection and analysis of the object; at the same time, since the light converges at the focal point and then collimates through the convex lens 5, it can be more concentratedly irradiated to the object surface, which can effectively suppress the stray light generated by the beam splitter 4 or the reflection inside the shell 1, reducing the generation and propagation of stray light, and also helps to improve the contrast and signal-to-noise ratio of the imaging, making the imaging more clear and accurate, reducing the image interference and misjudgment caused by stray light.

[0034] Specifically, as shown in FIG. 6, the light uniforming sheet 6 is installed in the space enclosed by the flange 213, the light uniforming sheet 6 is tightly fitted with the flange 213, providing a precise positioning reference for the light uniforming sheet 6, ensuring the accurate position of the light uniforming sheet 6 in the light path, avoiding abnormal light propagation caused by position deviation, ensuring that the light can accurately pass through the diffusion and uniformization processing of the light uniforming sheet 6, this design makes the installation of the light uniforming sheet 6 more convenient, without the need for additional complex positioning devices or precise measuring tools, just align and fix the light uniforming sheet 6 with the flange 213, reducing the installation difficulty and cost, improving the production efficiency, at the same time, the equal thickness makes the flange 213 and the light uniforming sheet 6 form a good sealing effect, reducing the light leakage from the gap between them, ensuring that more light can propagate and process according to the predetermined light path, improving the utilization efficiency of the light source and enhancing the lighting effect. Figure 3As shown, the chamber one 21 is further provided with a lamp panel 215, the lamp panel 215 is provided with a circuit board 216, the lamp beads 3 are electrically connected with the circuit board 216.

[0035] Further, as Figure 4 As shown, the shell 1 is further provided with a power line 7, the circumferential wall of the cover cylinder 211 is provided with a connecting hole 214, the power line 7 passes through the connecting hole 214 and is connected with the lamp beads 3, so that the arrangement of the power line 7 is more reasonable and compact, the power line 7 is prevented from being randomly wound or scattered in the light source, the interference and influence on other components in the light source are reduced, the neatness and stability of the internal structure of the light source are improved, and meanwhile, the interference of external light is reduced.

[0036] Specifically, as Figure 1 And Figure 6 As shown, the chamber two 22 is further provided with an observation port 222 opposite to the light outlet 221, the observation port 222 is arranged to enable the user or the technician to directly observe the internal condition of the chamber two 22, the parallel light is incident on the beam splitter 4, part of the light is transmitted out of the light outlet 221 to form illumination, and part of the light is reflected to the observation port 222 to facilitate debugging; when the observation and operation are performed through the observation port 222, a certain distance can be kept, the risk of damage or performance decline caused by directly contacting the optical element is reduced, and the safety and reliability of the light source are improved.

[0037] Specifically, as Figure 5 As shown, the optical axis of the convex lens 5 is inclined to the normal line of the beam splitter 4 by a certain angle A, the size of the angle A is 45°, the beam splitter 4 can evenly distribute the reflection and transmission ratio of the incident light under the 45° incident angle, this design ensures that the light emitted from the light source forms uniform parallel illumination light after being reflected by the beam splitter 4, and the transmission part can be used for observation or auxiliary calibration, the 45° angle makes the optical axis and the normal line of the beam splitter 4 form a symmetrical layout, the collimated light is incident on the beam splitter 4 at the best angle, the reflection light divergence caused by the deviation of the incident angle is reduced, the strict directionality of the parallel light is maintained, the energy loss or spot distortion caused by the inclination of the light path is avoided, and it is ensured that the light is vertically incident on the target detection surface.

[0038] Preferably, the inner wall of the shell 1 is coated with a high reflectivity coating, since the stepped structure of the Fresnel lens will cause multiple refraction and scattering, the proportion of stray light is increased, the light path of the convex lens 5 is relatively neat, and the shell 1 is coated with a high reflectivity coating, such as a silver layer lamp, which can reflect the scattered light back to the main light path, reduce the energy loss, this design reduces the dependence on high-power lamp beads 3, and further reduces the heat dissipation burden.

[0039] The working principle of the utility model is described in detail as follows;

[0040] The light emitted by the lamp bead 3 is guided to the light uniformizing sheet 6 through the cover cylinder 211, diffused through the microstructure or frosted surface, collimated as parallel light by the customized convex lens 5, and the parallel light is incident into the beam splitter 4 at 45°, and the beam splitter 4 forms illumination through the transmission light outlet 221, and the parallelization and uniform diffusion of the light are realized.

[0041] The utility model discloses an innovation lies in through the design of the cavity, the combination of light uniformizing sheet and customized convex lens, solve the traditional parallel coaxial light source light spot uneven, energy loss is big, the problem of poor adaptability, especially applicable to high-precision machine vision detection scene, has the significant technical advantage and market competitiveness.

[0042] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and the skilled person should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other implementations that can be understood by the skilled person.

[0043] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A parallel coaxial light source, characterized in that, Includes a housing (1), the housing (1) has an installation cavity (2), the installation cavity (2) includes a first chamber (21) and a second chamber (22) that are connected to each other, the first chamber (21) has an LED bead (3), the second chamber (22) has a beam splitter (4) and a light outlet (221), and a convex lens (5) is provided at the connection between the first chamber (21) and the second chamber (22); The chamber 1 (21) is also provided with a cover (211), the lamp bead (3) is disposed in the cover (211), the end of the cover (211) extends toward the convex lens (5) and is provided with a mounting hole (212), and a light-diffusing plate (6) is provided at the mounting hole (212).

2. The parallel coaxial light source according to claim 1, characterized in that, The light-diffusing plate (6) includes a fixing part (61) and a light-transmitting part (62). The end of the cover (211) is provided with a fixing surface (2111). The light-transmitting part (62) covers the mounting hole (212). The fixing part (61) is fixedly connected to the fixing surface (2111).

3. The parallel coaxial light source according to claim 2, characterized in that, The end of the cover (211) is provided with an outwardly extending convex edge (213), the thickness H1 of which is equal to the thickness H2 of the light-diffusing sheet (6).

4. The parallel coaxial light source according to claim 3, characterized in that, The light-diffusing sheet (6) is a microstructure diffuser or a frosted optical sheet.

5. The parallel coaxial light source according to claim 1, characterized in that, The light-diffusing plate (6) is located at the focal point of the convex lens (5).

6. The parallel coaxial light source according to claim 5, characterized in that, The focal points of the lamp bead (3) and the convex lens (5) are located on the same horizontal line.

7. The parallel coaxial light source according to claim 1, characterized in that, It also includes a power cord (7), and a connection hole (214) is provided on the peripheral wall of the cover (211). The power cord (7) passes through the connection hole (214) and connects to the lamp bead (3).

8. The parallel coaxial light source according to claim 1, characterized in that, The second chamber (22) is also provided with an observation port (222) which is opposite to the light outlet (221).

9. A parallel coaxial light source according to claim 1, characterized in that, The optical axis of the convex lens (5) is at 45° to the normal of the beam splitter (4).

10. A parallel coaxial light source according to claim 1, characterized in that, The inner wall of the housing (1) is coated with a high reflectivity coating.

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