An optical path calibration module

Abstract

This application discloses an optical path calibration module with a first light inlet, a second light inlet, and a first light outlet. Internally, it includes a first beam splitter. The first light inlet receives a calibration beam from a calibration light source, or can be closed. The second light inlet receives a beam from a target light source, or receives a calibration beam from the calibration light source. The first light outlet emits a detection beam to a photoelectric sensor. The first beam splitter forms a 45° angle with both the first and second light inlets. This optical path calibration module can determine whether the attenuation or distortion of the original device's photoelectric sensor's detection signal is due to damage to the photoelectric sensor, and can also adjust the optical path. Depending on the production line environment, this optical path calibration module can also be externally connected to a detachable T-shaped cavity structure, thereby changing the installation position of the calibration light source, facilitating production assembly or production line application testing, and effectively improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of optical sensing, and more specifically to an optical path calibration module. Background Technology

[0002] A photoelectric sensor generally consists of three parts: the photoelectric sensor itself, an optical path calibration module, and a light source module. A photoelectric sensor for detecting the quality of laser processing typically includes a housing, a beam splitter, and a photosensitive element. Its working principle involves using built-in multi-component optical elements to separate the incident light into at least two spectra, which are then received and output as photoelectric sensing signals by corresponding photodiodes in the beam splitter's optical path. However, in practical applications, the accuracy of optical detection decreases over long-term use. For example, some photodiodes and other devices in the multi-spectrum array may age due to prolonged use, causing signal attenuation or distortion.

[0003] The attenuation or distortion of the detection signal from the photoelectric sensor in the original equipment can be caused by three main reasons: 1. Defects on the surface of the workpiece being processed. In this case, the attenuation or distortion of the detection signal is normal and the equipment is not faulty; 2. The photoelectric sensor malfunctions, resulting in abnormal attenuation; 3. Vibration in the equipment or disassembly / reassembly causes a shift in the laser processing signal. Determining the cause of signal distortion, such as identifying a photoelectric sensor malfunction leading to attenuation or distortion, is a problem that existing photoelectric sensors or auxiliary photoelectric devices need to address. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an optical path calibration module. A calibration beam emitted from a calibration light source enters the optical path calibration module and then the photoelectric sensor, facilitating internal optical path calibration and accurately determining whether signal attenuation or distortion is caused by the photoelectric sensor. The technical solution adopted by this invention to achieve the above objectives is as follows:

[0005] An optical path calibration module has multiple outer sidewalls that enclose an internal cavity. A first light inlet, a second light inlet, and a first light outlet are respectively formed on some of the outer sidewalls. A first beam splitter is disposed within the internal cavity.

[0006] The first light inlet is used to receive or shut off the calibration beam from an external light source;

[0007] The second light inlet is used to receive the target light source beam;

[0008] The first light output port is used to output the target light source beam and / or the calibration beam;

[0009] The first beam splitter is used to guide the calibration beam entering through the first light inlet to the first light outlet for output, and / or to guide the target light source beam entering through the second light inlet to the first light outlet for output.

[0010] Furthermore, the first beam splitter is a neutral beam splitter, which is used to reflect the target light source beam from the second light inlet to the first light outlet. The first beam splitter is also used to transmit the calibration beam from the first light inlet to the first light outlet, wherein the radiation frequency width of the calibration beam covers the frequency of the target light source beam.

[0011] Furthermore, as described above, the optical path calibration module also includes a T-shaped cavity structure and a second beam splitter. The left cavity of the T-shaped cavity structure is the second light inlet, the lower cavity is the first light inlet, and the right cavity extends to the first beam splitter, so that the light beam from the right cavity is reflected to the first light outlet after passing through the first beam splitter. The second beam splitter is a neutral beam splitter. The second beam splitter is used to transmit the target light source beam from the second light inlet to the first beam splitter. The second beam splitter is also used to reflect the calibration beam from the first light inlet to the first beam splitter.

[0012] Furthermore, the optical path calibration module described above also includes an adjustment frame, which includes: a beam splitter support, a base for fixing the beam splitter support, a cover plate for elastically connecting the base, a movable shaft, and a threaded pair, with the adjustment frame disposed in an internal cavity.

[0013] The beam splitter bracket has a side and a bottom. The side of the beam splitter bracket is a hollow inclined surface, and the first beam splitter is fixed in the hollow inclined surface by a pressure plate. The bottom of the beam splitter bracket is fixed to the cover plate, and the bottom of the beam splitter bracket is provided with a light-transmitting hole.

[0014] The cover plate has a light-transmitting hole in the center, and the base is elastically connected to the bottom of the cover plate. A movable pivot and a threaded pair are elastically provided between the cover plate and the base.

[0015] The base has a first light inlet at its center; the first light inlet, the light-transmitting hole of the cover plate, and the light-transmitting hole of the beam splitter bracket are connected.

[0016] A recess is provided between the base and the cover plate to hold the movable pivot, and a through hole is provided on one side of the recess to accommodate the threaded pair.

[0017] The top end of the threaded pair passing through the through hole abuts against the cover plate, and the bottom end of the threaded pair extends out of the through hole and is fixed to the lower surface of the base by the threaded pair cap. The distance between the base and the cover plate is adjusted by rotating the threaded pair cap that protrudes from the lower surface of the base.

[0018] Furthermore, a first through hole and a second through hole are provided on both sides of the center of the base, and threaded pairs are respectively provided in the first through hole and the second through hole; a triangular plane is formed by the movable shaft and the threaded pairs corresponding to the first through hole and the second through hole; with the movable shaft as the fulcrum, the threaded pair cap of any threaded pair is rotated to adjust the tilt angle of the cover plate relative to the base.

[0019] Furthermore, the optical path calibration module described above also includes a T-shaped cavity structure and a second beam splitter. The left cavity of the T-shaped cavity structure serves as the second light inlet, the lower cavity as the first light inlet, and the right cavity extends to the first beam splitter, so that the light beam from the right cavity is reflected by the first beam splitter to the first light outlet. The second beam splitter is a total internal reflection optical lens. The second beam splitter is detachably inserted into the optical path calibration module through the lower cavity serving as the first light inlet, reflecting the calibration beam entering through the first light inlet to the first beam splitter. The second beam splitter blocks the target light source beam from entering the optical path calibration module through the second light inlet.

[0020] Furthermore, the recess between the base and the cover plate is a first recess and a second recess. The first recess is located at the intersection of the X-axis and Y-axis of the base, and the second recess is located at the intersection of the X-axis and Y-axis of the cover plate. The movable pivot is a supporting ball, which is sandwiched between the first recess and the second recess.

[0021] Furthermore, at least one first blind hole is provided on the X-axis of the top surface of the base, and at least one second blind hole is provided on the side of the X-axis, with the second blind hole penetrating through the first blind hole; at least one third blind hole is provided on the Y-axis of the top surface of the base, and at least one fourth blind hole is provided on the side of the Y-axis, with the fourth blind hole penetrating through the third blind hole; springs are placed in the first and third blind holes respectively, and lower spring fixing posts are inserted into the second and fourth blind holes respectively, with the lower end of the spring hooking onto the lower spring fixing post;

[0022] The cover plate has at least one fifth through hole on its X-axis corresponding to the first blind hole, and at least one sixth through hole on its Y-axis corresponding to the third blind hole. The top surface of the cover plate has a first groove and a second groove. The first groove passes through the fifth through hole, and the second groove passes through the sixth through hole. The upper spring fixing post is placed in the first groove and the second groove respectively. The upper end of the spring hooks onto the upper spring fixing post, and the base and the cover plate are in an elastic connection state.

[0023] Furthermore, the top of the threaded pair forms an inward spherical depression, and a sphere is placed inside the spherical depression;

[0024] The inner surface of the cover plate is also provided with a third groove corresponding to the threaded pair. Two guide parallel sliding pillars for the ball to slide are embedded in the third groove along the X-axis direction of the cover plate. The cover plate is also provided with a circular groove on the Y-axis that allows the ball to rotate with the ball as the fulcrum.

[0025] Furthermore, the first beam splitter is a beam splitter with a splitting ratio of 5:5, and it forms a 45° angle with both the first and second light inlets.

[0026] Furthermore, the second beam splitter is a beam splitter with a splitting ratio of 5:5, which is located at the corner of the T-shaped cavity structure and forms a 45° angle with the second light inlet.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) In this application, a first light inlet for receiving a calibration beam from an external light source, a second light inlet for receiving a target light source beam, and a first beam splitter are introduced into the optical path calibration module to guide the target light source beam and / or the calibration beam out from the first light outlet and into the target photoelectric sensor, so as to determine whether the detection signal of the photoelectric sensor of the original device is “attenuated” or “distorted” due to damage to the photoelectric sensor.

[0029] (2) By using the beam splitter bracket, base, cover plate, and movable rotating shaft and threaded pair inside the calibration module, the tilt angle of the first beam splitter can be finely adjusted, which can conveniently realize the calibration function of the internal optical path.

[0030] (3) Depending on the production line environment, the calibration module may also include a T-shaped cavity structure and a second beam splitter, so that the target beam and the calibration beam enter in the same direction through the light inlet, and the calibration beam is guided to the first beam splitter by the reflection of the second beam splitter, which facilitates production assembly or production line application testing and effectively improves production efficiency.

[0031] (4) In the T-shaped cavity structure of the calibration module, the second beam splitter is detachably installed therein. When the total reflection mirror is used to guide the beam, the left side of the total reflection mirror blocks the interference of the target light source beam and external stray light, and the right side reflects the calibration beam from the calibration light source to the first beam splitter, thus maximizing the output power of the calibration beam. Attached Figure Description

[0032] Figure 1 This is a simplified structural diagram of the calibration module in Example 1.

[0033] Figure 2 This is an assembly diagram of the calibration module with a T-shaped cavity structure in Example 2.

[0034] Figure 3 for Figure 2 Cross-sectional view.

[0035] Figure 4 A 3D view of the frame being adjusted for the optical path calibration module.

[0036] Figure 5 A 3D view of the adjustable eyeglass frame base.

[0037] Figure 6 A front view showing the adjustment of the eyeglass frame cover.

[0038] Figure 7 The reverse side view for adjusting the frame cover.

[0039] Figure 8 This is a 3D view of the beam splitter support.

[0040] Figure 9 This is a three-dimensional view of the outer wall of the optical path calibration module.

[0041] Figure 10 This is a view of the other side of the outer wall. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should be understood that the term “and / or” used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character “ / ” in this document generally indicates that the preceding and following related objects are in an “or” relationship. It should be understood that although the terms “first,” “second,” and similar words may be used in the embodiments of this application, they do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “a” or “one,” and similar words do not indicate a quantity limitation, but rather indicate the existence of at least one. “Multiple” in the embodiments of this application refers to two or more.

[0044] In photoelectric sensor applications, in order to determine the cause of signal distortion received by the photoelectric sensor, such as whether the "attenuation" or "distortion" of the detection signal is caused by a fault in the photoelectric sensor itself, or by a variation in the signal received externally by the photoelectric sensor, this application introduces an optical path calibration module to determine or assist the photoelectric sensor in determining the cause of signal distortion.

[0045] Please see Figure 1 This application provides an optical path calibration module 1, which has multiple outer sidewalls forming an internal cavity. A first light inlet 10, a second light inlet 20, and a first light outlet 30 are respectively opened on some of the outer sidewalls. A first beam splitter 40 is disposed within the internal cavity. The first light inlet 10 is used to receive or shut off a calibration beam from an external light source; the second light inlet 20 is used to receive a target light source beam; the first light outlet 30 is used to output the target light source beam and / or the calibration beam; the first beam splitter 40 is used to guide the calibration beam entering through the first light inlet to the first light outlet for output, and / or guide the target light source beam entering through the second light inlet to the first light outlet for output. In this embodiment, the optical path calibration module 1 includes a first light inlet 10 for receiving a calibration beam from an external light source, a second light inlet 20 for receiving a target light source beam, and a first beam splitter 40. These components guide the target light source beam and / or the calibration beam out from the first light outlet 30 and into the target photoelectric sensor to determine whether the original device's photoelectric sensor's detection signal has been "attenuated" or "distorted" due to damage to the photoelectric sensor. In one application scenario, the target light source beam can be laser processing light from an external laser head or laser processing reflected light from an external laser processing work surface. The calibration beam can be a narrowband spectral light source in the same spectral frequency band as the target beam, or it can include broadband spectral light sources covering the spectral frequency band of the target beam.

[0046] Furthermore, the first beam splitter 40 is a neutral beam splitter. The first beam splitter 40 is used to reflect the target light source beam from the second input port 20 to the first output port 30. The first beam splitter 40 is also used to transmit the calibration beam from the first input port 10 to the first output port 30, wherein the radiation frequency width of the calibration beam covers the frequency of the target light source beam. It can be understood that when the first beam splitter 40 is a neutral beam splitter, the second input port 20 can be temporarily closed to avoid the target light source beam affecting the calibration beam. It can also be understood that when the first beam splitter 40 is a dichroic mirror / diachroic mirror, the second input port 20 can be continuously opened, meaning the dichroic mirror completely reflects the target light source beam from the second input port 20 to the first output port 30, and the dichroic mirror almost completely transmits the calibration beam from the first input port 10. In this case, the wavelength of the target light source beam can be different from the wavelength of the calibration beam.

[0047] For further details, please refer to Figure 2The optical path calibration module 1 provided in this application also includes a T-shaped cavity structure 50 and a second beam splitter 60. The left cavity of the T-shaped cavity structure 50 is the second light inlet 20, the lower cavity is the first light inlet 10, and the right cavity extends to the first beam splitter 40 inside the optical path calibration module 1, so that the light beam from the right cavity is reflected to the first light outlet 30 after passing through the first beam splitter 40. The second beam splitter 60 is a neutral beam splitter. The second beam splitter 60 is used to transmit the target light source beam from the second light inlet 20 to the first beam splitter 40, and the second beam splitter 60 is also used to reflect the calibration beam from the first light inlet 10 to the first beam splitter 40. It can be understood that the embodiments of this application, through the T-shaped cavity structure 50 and the second beam splitter 60, ensure that the target light beam passing through the second light inlet 20 and the calibration beam passing through the first light inlet 10 enter in the same direction relative to the first beam splitter 40, which facilitates production assembly or production line application testing and effectively improves production efficiency. Furthermore, in the T-shaped cavity structure 50 of the optical path calibration module 1, the second beam splitter 60 is a total reflection mirror that can be detachably installed therein. When the total reflection mirror is used to guide the beam, its left side blocks the interference of the target light source beam and external stray light, while its right side reflects the calibration beam from the calibration light source to the first beam splitter, thus maximizing the output power and detection effectiveness of the calibration beam.

[0048] Example 2: As Figure 1 , Figure 3-10 As shown, an optical path calibration module 1 has a first light inlet 10, a second light inlet 20, and a first light outlet 30, and internally houses a first beam splitter 40.

[0049] The first light inlet 10 first receives the calibration beam from the calibration light source. After calibration is completed, the calibration light source is removed and the first light inlet 10 is closed to prevent stray light from entering the photoelectric sensor through the calibration module 1.

[0050] The second light inlet 20 receives the beam of the target light source;

[0051] The first light output port 30 emits a detection beam to the photoelectric sensor;

[0052] The first beam splitter 40 forms a 45° angle with both the first light inlet 10 and the second light inlet 20.

[0053] In this embodiment, the first beam splitter 40 is a beam splitter with a splitting ratio of 5:5. The calibration light source is installed at the first light inlet 10 of the calibration module 1. The calibration beam emitted by the calibration light source enters the calibration module 1 and is reflected and transmitted by the first beam splitter 40. The transmitted calibration beam is emitted from the first light outlet 30 and received by the photoelectric sensor. At least two spectra are separated through the beam splitting optical path inside the photoelectric sensor. The photoelectric sensor receives and outputs a photoelectric sensing signal through the photosensitive PD (generally a photodiode) corresponding to the beam splitting optical path and marks the signal. The signal marked by the calibration light source is compared with the photoelectric sensing signal output by the target light source beam in the actual production process to determine whether the photoelectric sensor itself is damaged.

[0054] Typically, the optical path within a photoelectric sensor is split into multiple optical paths by a beam splitter. Therefore, the optical path calibration module 1 of this application can determine the consistency of the photoelectric sensing signal before and after the use of multiple optical paths within the photoelectric sensor at once, thereby adjusting the optical path.

[0055] Once the consistency is confirmed to meet the requirements, the calibration light source can be removed, and the first light inlet 10 can be closed to prevent external light from entering and affecting the detection results of the photoelectric sensor.

[0056] When the first beam splitter 40 is a neutral beam splitter, it reflects the target light source beam from the second input port 20 to the first output port 30 and transmits the calibration beam from the first input port 10 to the first output port 30. The calibration beam can be a monochromatic light source or a broadband light source. Using a monochromatic light source avoids the influence of ambient light on the calibration results. Using a broadband light source, for example, where the calibration beam's radiation frequency width covers the target light source beam frequency, allows for a more accurate fit to the target light source beam's emission environment.

[0057] When the first beam splitter 40 is a dichroic mirror / dichroic mirror, the first beam splitter 40 is used to reflect all the target light source beam from the second light inlet 20 to the first light outlet 30, and to transmit all the calibration beam from the first light inlet 10 to the first light outlet 30, wherein the target light source beam and the calibration beam have different radiation frequencies.

[0058] Example 3: As Figure 2-10As shown, an optical path calibration module 1 has a first light inlet 10, a second light inlet 20, a first light outlet 30, and a T-shaped cavity structure 50. A first beam splitter 40 and a second beam splitter 60 are disposed inside the T-shaped cavity structure 50. In this configuration, the T-shaped cavity structure 50 is installed on the left side of the calibration module described in Embodiment 1. The right cavity of the T-shaped cavity structure 50 extends through the second light inlet 20 to the first beam splitter 40. The left cavity of the T-shaped cavity structure 50 is the second light inlet 20, the lower cavity is the first light inlet 10, and the right cavity... The cavity extends to the first beam splitter 40, so that the beam from the right cavity is reflected by the first beam splitter 40 to the first output port 30. The second beam splitter 60 is a neutral beam splitter or a total reflection mirror. The second beam splitter is used to transmit the target light source beam from the second input port 20 to the first beam splitter 40. The second beam splitter 20 is also used to reflect the calibration beam from the first input port 10 to the first beam splitter 40. In this embodiment, the second beam splitter 60 is selected from the neutral beam splitters with a splitting ratio of 5:5.

[0059] In Example 2, the first light inlet 10 is closed. In this example, the first light inlet 10 first receives the calibration beam from the calibration light source. After calibration is completed, the calibration light source is removed and the first light inlet 10 is closed to prevent stray light from entering the photoelectric sensor through the calibration module 1.

[0060] The second light inlet 20 receives the beam of the target light source;

[0061] The first light output port 30 emits a detection beam to the photoelectric sensor;

[0062] The second beam splitter 60 is inserted into the corner of the T-shaped cavity structure 50 through the first light inlet 10, forming a 45° angle with both the first light inlet 50 and the second light inlet 20.

[0063] The first beam splitter 40 is parallel to the second beam splitter 60. This ensures the collimation of the calibration beam reflected by the second beam splitter 60, maximizing the output power of the calibration beam incident on the photoelectric sensor.

[0064] In this embodiment, the calibration light source is installed at the first light inlet 10 of the T-shaped cavity structure 50. The calibration beam emitted by the calibration light source enters the T-shaped cavity structure 50 and is reflected by the second beam splitter 60 installed at the corner inside the T-shaped cavity structure 50. At the same time, when the target light source is installed at the second light inlet 20, the transmitted light of the target light source beam and the reflected light of the calibration beam are reflected together by the first beam splitter 40 and then emitted from the first light outlet 30, where they are received by the photoelectric sensor. Thus, the same method as in Embodiment 2 is used to determine whether the photoelectric sensor itself is damaged.

[0065] Once the consistency requirement is met, the calibration light source can be removed, the T-shaped cavity structure 50 is also removed, and the target light source beam enters the calibration module 1 through the second light inlet 20 in Example 2.

[0066] Example 4: In this example, unlike Example 3, the second beam splitter is replaced with a total reflection mirror 60. The total reflection mirror 60 is inserted into the corner of the T-shaped cavity structure 50 through the first light inlet 10, forming a 45° angle with both the first and second light inlets 50 and 20. On one hand, the calibration beam from the first light inlet 10 is completely reflected, then reflected again by the first beam splitter 40. The reflected calibration beam exits from the first light outlet 30 and is received by the photoelectric sensor, maximizing the output power of the calibration beam. On the other hand, when the target light source beam enters the T-shaped cavity structure 50 through the second light inlet 20, the total reflection mirror 60 reflects the entire target light source beam upwards, eliminating interference from the target light source and external stray light.

[0067] Example 5: Figure 4-10 As shown, based on the optical path calibration module 1 described in Examples 1-4, each module can further include an adjustment frame 2. The adjustment frame 2 includes: a beam splitter support 23, a base 21 for fixing the beam splitter support 23, a cover plate 22 for elastically connecting the base 21, a movable rotating shaft 25, and a threaded pair 26. The adjustment frame 2 is disposed in the internal cavity. The main purpose of the adjustment frame 2 is to ensure the collimation of the reflected beam of the first beam splitter 40 by finely adjusting the angle of the first beam splitter 40 on the adjustment frame 2, thereby ensuring the angle between the first beam splitter 40 and the first light inlet 10 and the second light inlet 20, and maximizing the output power of the calibration beam incident on the photoelectric sensor.

[0068] The beam splitter bracket 23 has a side surface 233 and a bottom surface 231. The side surface 233 of the beam splitter bracket is a hollow inclined surface. The first beam splitter 40 is fixed in the hollow inclined surface 233 by a pressure plate 234. The bottom surface 231 of the beam splitter bracket is fixed on the cover plate 22. The bottom surface 231 of the beam splitter bracket is provided with a light-transmitting hole 232.

[0069] A light-transmitting hole 221 is provided in the center of the cover plate 22, and a base 21 is elastically connected below the cover plate 22. A movable rotating shaft 25 and a threaded pair 26 are elastically provided between the cover plate 22 and the base 21.

[0070] In this embodiment, the calibration module 1 is a cuboid, and the adjustment frame 2 is installed inside the cuboid. The bottom surface 21 of the adjustment frame 2 is the bottom surface of the cuboid. Therefore, the light-transmitting hole on the bottom surface 21 is the first light inlet 10. The first light inlet 10, the light-transmitting hole 221 of the cover plate 22, and the hollow inclined surface 233 of the beam splitter bracket 23 are connected.

[0071] A recess is provided between the base 21 and the cover plate 22 to clamp the movable rotating shaft 25. A through hole is provided on one side of the recess to accommodate the threaded pair 26. The top end of the threaded pair 26 passing through the through hole abuts against the cover plate 22. The bottom end of the threaded pair 26 extends out of the through hole and is fixed to the lower surface 214 of the base by the threaded pair cap 261. The distance between the base 21 and the cover plate 22 is adjusted by rotating the threaded pair cap 261 that protrudes from the lower surface 214 of the base.

[0072] In this embodiment, the recesses are a first recess 212 on the base plate 21 and a second recess 223 on the cover plate 22. The first recess 212 is located at the intersection of the X-axis and Y-axis of the base, and the second recess 223 is located at the intersection of the X-axis and Y-axis of the cover plate. The movable pivot 25 is described using a supporting ball as an example; the supporting ball 25 is sandwiched between the first recess 212 and the second recess 223. There are two through holes, respectively located on the X-axis and Y-axis of the top surface 211 of the base. A first through hole 215 is located on the X-axis of the top surface 211 of the base, and a second through hole 216 is located on the Y-axis. A threaded pair 26 for adjusting the angle of the first beam splitter 20° is provided within both the first through hole 215 and the second through hole 216. Therefore, the triangular plane formed by the threaded pairs 26 corresponding to the supporting ball 25, the first through hole 215, and the second through hole 216; when the two threaded pairs 26 are adjusted to rise and fall, the X-axis or Y-axis of the cover plate 22 rises and falls with the supporting ball 25 as the fulcrum, thereby achieving the tilting of the top surface 222 of the cover plate, thereby driving the fine adjustment of the angle of the first beam splitter 40.

[0073] In this embodiment, the cover plate 22 is elastically connected to the base 21 below, which makes the adjustment of the tilt angle of the cover plate 22 relative to the base 21 more accurate. The elastic connection method is as follows:

[0074] At least one first blind hole 218 is provided on the X-axis of the top surface 211 of the base, and at least one second blind hole (not shown in the figure) is provided on the side surface 213 of the X-axis, with the second blind hole penetrating through the first blind hole 218; at least one third blind hole 217 is provided on the Y-axis of the top surface 211 of the base, and at least one fourth blind hole (not shown in the figure) is provided on the side surface 219 of the Y-axis, with the fourth blind hole penetrating through the third blind hole 217; springs 4 are placed in the first blind hole 218 and the third blind hole 217 respectively, and lower spring fixing posts (not shown in the figure) are inserted into the second blind hole and the fourth blind hole respectively, with the lower end of the spring 4 hooking onto the lower spring fixing post.

[0075] The top surface 222 of the cover plate has at least one fifth through hole 225 corresponding to the first blind hole 218 on the X-axis, and at least one sixth through hole 226 corresponding to the third blind hole 217 on the Y-axis. The top surface 222 of the cover plate has a first groove 228 and a second groove 229. The first groove 228 passes through the fifth through hole 225, and the second groove 229 passes through the sixth through hole 226. The upper spring fixing post 5 is placed in the first groove 228 and the second groove 229 respectively. The upper end of the spring 4 hooks the upper spring fixing post 5. The base 21 and the cover plate 22 are in an elastic connection state.

[0076] In some embodiments, a spherical recess is formed inward at the top of the threaded pair 26, and a sphere 264 is placed in the spherical recess.

[0077] The inner surface of the cover plate is also provided with a third groove 227 corresponding to the threaded pair 26. Two guiding parallel slide posts 7 are embedded in the third groove 227 along the X-axis direction of the cover plate 22, allowing the ball 264 to slide. A circular groove 8 is also provided on the Y-axis of the cover plate 22, allowing the ball 264 to rotate around it. The guiding parallel slide posts 7 and the circular groove 8 are to ensure that when the threaded pair 26 adjusts the X-axis of the cover plate 22, the X-axis and Y-axis of the cover plate 22 will not shift; when the threaded pair 26 adjusts the Y-axis of the cover plate 22, the X-axis and Y-axis of the cover plate 22 will still not shift. It can be understood that the guiding parallel slide posts 7 can be located on either the X-axis or the Y-axis, and the circular groove 8 is similarly positioned.

[0078] In some embodiments, the outer wall of the optical path calibration module 1 may also have a second light outlet 70 for mounting a camera, facilitating camera installation by the customer. The first light outlet 30 may also have a locking ring 31 protruding upwards to facilitate fastening and loosening of the photoelectric sensor.

[0079] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An optical path alignment module having a multi-faceted outer sidewall that encloses an interior cavity, characterized in that, Part of the side walls of the multi-faceted outer side wall are respectively provided with a first light inlet, a second light inlet and a first light outlet, and a first light splitting device is arranged in the internal cavity, The first light inlet is used for receiving or closing the calibration light beam from the external light source. The second light inlet is used for receiving the target light source light beam. The first light outlet is used for outputting the target light source light beam and / or the calibration light beam. The first light splitting device is used for guiding the calibration light beam entering the first light inlet to the first light outlet for output, and / or guiding the target light source light beam entering the second light inlet to the first light outlet for output. The optical path calibration module further comprises an adjusting mirror frame, and the adjusting mirror frame comprises a light splitting device support, a base for fixing the light splitting device support, a cover plate elastically connected to the base, a movable rotating shaft and a threaded pair. The adjusting mirror frame is arranged in the internal cavity. The light splitting device support has a side surface and a bottom surface. The side surface of the light splitting device support is a hollow inclined surface, and the first light splitting device is fixed in the hollow inclined surface by pressing. The bottom surface of the light splitting device support is fixed on the cover plate, and the bottom surface of the light splitting device support is provided with a light transmission hole. A light transmission hole is arranged at the center of the cover plate, and the cover plate is elastically connected to the base. The cover plate and the base are elastically arranged with the movable rotating shaft and the threaded pair. The center of the base is provided with a first light inlet for light transmission. The first light inlet, the light transmission hole of the cover plate and the light transmission hole of the light splitting device support are through. A recess is arranged between the base and the cover plate to clamp the movable rotating shaft. A through hole is arranged on one side of the recess to accommodate the threaded pair. The top end of the threaded pair passing through the through hole abuts against the cover plate. The lower end of the threaded pair passes through the through hole and is fixed to the lower surface of the base by a threaded pair cap. The distance between the base and the cover plate is adjusted by rotating the threaded pair cap exposed on the lower surface of the base.

2. The optical path alignment module of claim 1, wherein, The first light splitting device is a neutral light splitting mirror. The first light splitting device is used for reflecting the target light source light beam from the second light inlet to the first light outlet. The first light splitting device is also used for transmitting the calibration light beam from the first light inlet to the first light outlet. The frequency width of the calibration light beam covers the frequency of the target light source light beam.

3. The optical path alignment module of claim 1, wherein, It also includes a T-shaped cavity structure and a second light splitting device. The left cavity of the T-shaped cavity structure is the second light inlet, the lower cavity is the first light inlet, and the right cavity penetrates to the first light splitting device, so that the light beam of the right cavity is reflected to the first light outlet after passing through the first light splitting device. The second light splitting device is a neutral light splitting mirror. The second light splitting device is used for transmitting the target light source light beam from the second light inlet to the first light splitting device. The second light splitting device is also used for reflecting the calibration light beam from the first light inlet to the first light splitting device.

4. The optical path alignment module of claim 3, wherein, First and second through holes are arranged on both sides of the center of the base, and a threaded pair is arranged in each of the first and second through holes. The movable rotating shaft and the threaded pairs corresponding to the first and second through holes form a triangular plane. With the movable rotating shaft as the fulcrum, the threaded pair cap of any threaded pair is rotated to adjust the inclination angle of the cover plate relative to the base.

5. The optical path alignment module of claim 1, wherein, The T-shaped cavity structure has a left cavity as the second light inlet, a lower cavity as the first light inlet, and a right cavity penetrating to the first light splitting device, so that the light beam of the right cavity is reflected to the first light outlet after passing through the first light splitting device.

6. The optical path alignment module of claim 1, wherein, The recess between the base and the cover plate is a first recess and a second recess, the first recess is located at the intersection of the X-axis and the Y-axis of the base, and the second recess is located at the intersection of the X-axis and the Y-axis of the cover plate.

7. The optical path alignment module of claim 6, wherein, The X-axis of the top surface of the base is provided with at least one first blind hole, the X-axis side is provided with at least one second blind hole, the second blind hole penetrates the first blind hole; the Y-axis of the top surface of the base is provided with at least one third blind hole, the Y-axis side is provided with at least one fourth blind hole, the fourth blind hole penetrates the third blind hole; springs are respectively placed in the first blind hole and the third blind hole, lower spring fixing columns are respectively inserted into the second blind hole and the fourth blind hole, and the lower end of the spring hooks the lower spring fixing column. The X-axis of the cover plate is provided with at least one fifth through hole corresponding to the first blind hole, the Y-axis of the cover plate is provided with at least one sixth through hole corresponding to the third blind hole, the top surface of the cover plate is provided with a first recess and a second recess, the first recess penetrates the fifth through hole, and the second recess penetrates the sixth through hole; upper spring fixing columns are respectively placed in the first recess and the second recess, the upper end of the spring hooks the upper spring fixing column, and the base and the cover plate are in an elastic connection state.

8. The optical path alignment module of claim 6, wherein, The top end of the threaded pair forms a spherical recess inwardly, and a ball is placed in the spherical recess; The inner surface of the cover plate is further provided with a third recess corresponding to the threaded pair, and two guide parallel sliding columns for the ball to slide are embedded in the third recess along the X-axis direction of the cover plate; the Y-axis of the cover plate is further provided with a circular recess rotating around the ball as a fulcrum.

9. The optical path alignment module of claim 2, wherein, The first light splitting device is a light splitting ratio 5:5 light splitting device, and forms a 45° angle with the first light inlet and the second light inlet.

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