Optical module and laser sensor
Through the combination of polarization spectroscopic structure and reflective structure, the problem of large size of the laser sensor is solved, and the miniaturization and efficient detection of the laser sensor are achieved.
Patent Information
- Application Number
- CN202422136917.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-08-29
AI Technical Summary
The existing laser sensors are large in size, which is inconvenient to carry and use in small spaces.
The combination of polarization spectroscopic structure and reflective structure is adopted, and the polarization direction of light is changed through the coordination of the polarization spectroscopic structure and the reflective plate to judge the existence of the object to be measured, and the optical path is folded using the reflective structure to reduce the volume of the laser sensor.
The size of the laser sensor is reduced, which improves the sensitivity and accuracy of detection, while maintaining the stability and aesthetics of the sensor.
Smart Images
Figure CN223123229U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sensors, and particularly relates to an optical module and a laser sensor. Background Art
[0002] A laser sensor is a sensor that emits a laser beam to detect information such as the position and speed of a target object. The laser sensor emits a laser beam towards the target object, and then after appropriately processing the signal received from the reflection of the target object, relevant information of the target object can be obtained, thereby detecting, tracking, and identifying the target object. The laser sensor has the characteristics of long detection distance, high resolution, and small environmental interference, and is thus widely used in many technical fields such as intelligent robots, drones, and driverless vehicles.
[0003] However, the existing laser sensors are relatively large in size, not convenient to carry, and inconvenient to use in a narrow space. Summary of the Utility Model
[0004] The purpose of the embodiments of the present application is to provide an optical module and a laser sensor, aiming to solve the problems of how to detect the presence or absence of an object and how to reduce the volume of the laser sensor.
[0005] To achieve the above purpose, the technical solution adopted in the present application is as follows:
[0006] In a first aspect, an optical module is provided, including a reflection structure, a polarization beam splitting structure, an emission light source assembly for emitting light towards the polarization beam splitting structure, a reflector disposed at an interval from the polarization beam splitting structure, and a photodetector disposed on the same side of the reflector as the emission light source assembly. The space between the polarization beam splitting structure and the reflector is used to set the object to be measured. The light emitted by the emission light source assembly passes through the polarization beam splitting structure and irradiates towards the reflector. The polarization beam splitting structure is used to transmit the light reflected back by the object to be measured, or to reflect the light reflected back by the reflector to the photodetector. The reflection structure is used to reflect the light emitted by the emission light source assembly to the polarization beam splitting structure.
[0007] In some embodiments, the optical path between the polarization beam splitting structure and the photodetector is parallel to the optical path between the reflection structure and the emission light source assembly.
[0008] In some embodiments, the optical module further includes a module bracket, and the emission light source assembly, the photodetector, the reflection structure, and the polarization beam splitting structure are all arranged on the module bracket.
[0009] In some embodiments, the module bracket is provided with a light passing port, the polarization beam splitting structure is arranged corresponding to the light passing port, and both the light incident path and the light exiting path of the polarization beam splitting structure pass through the light passing port.
[0010] In some embodiments, the module bracket includes a first bracket body and a second bracket body. The emission light source assembly and the photodetector are installed on the first bracket body. One end of the second bracket body is fixedly connected to the first bracket body. The second bracket body separates the emission light source assembly and the photodetector. The second bracket body extends along a first direction. The reflection structure and the polarization beam splitting structure are arranged on opposite sides of the second bracket body. The second bracket body is provided with a light transmission port, and the light reflected by the reflection structure passes through the light transmission port and irradiates towards the polarization beam splitting structure.
[0011] In some embodiments, the optical module further includes a receiving lens. The receiving lens is arranged on the module bracket, and the light reflected by the polarization beam splitting structure is focused on the photodetector after passing through the receiving lens.
[0012] In some embodiments, the emission light source assembly includes a laser, a first lens, and a second lens. The light emitted by the laser sequentially passes through the first lens and the second lens and then exits. The first lens and the second lens are used to converge the divergent light beam emitted by the laser into a collimated light beam. The first lens and the second lens are arranged on the module bracket.
[0013] In some embodiments, the emission light source assembly further includes an emission aperture. The light passing through the first lens and the second lens irradiates the reflection structure after passing through the emission aperture. The emission aperture is used to limit the beam width of the light.
[0014] In some embodiments, a filter is arranged between the photodetector and the receiving lens. The filter is used to pass the light of a preset wavelength.
[0015] In a second aspect, a laser sensor is provided. The laser sensor includes the above-mentioned optical module.
[0016] The optical module provided by this application, by setting a polarization beam splitting structure, when there is no object to be measured, the reflector can reflect light and change the polarization direction of the light. The polarization beam splitting structure reflects the light reflected by the reflector to the photodetector, so the photodetector can receive the optical signal; when there is an object to be measured, the polarization direction of the light does not change after being reflected by the object to be measured, and the polarization beam splitting structure transmits the light reflected by the object to be measured, so the photodetector cannot receive the optical signal. Therefore, this application can determine whether there is an object to be measured according to whether the photodetector receives the optical signal, and the reflection structure can turn the light between the polarization beam splitting structure and the emission light source component, so as to fold the optical path between the polarization beam splitting structure and the emission light source component, thereby reducing the distance between the emission light source component and the photodetector along the direction of the polarization beam splitting structure pointing to the reflector, thereby being able to reduce the size of the module bracket, and further being able to reduce the volume of the laser sensor. Brief Description of the Drawings
[0017] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0018] Figure 1 It is a schematic structural diagram of one perspective of the optical module provided by the embodiment of this application;
[0019] Figure 2 It is a schematic structural diagram of another perspective of the optical module provided by the embodiment of this application;
[0020] Figure 3 It is a partial schematic structural diagram of the optical module provided by the embodiment of this application;
[0021] Figure 4 It is an optical path diagram of the optical module provided by the embodiment of this application when there is no object to be measured;
[0022] Figure 5 It is an optical path diagram of the optical module provided by the embodiment of this application when there is an object to be measured.
[0023] Among them, the reference numerals in the drawings:
[0024] 10. Module Bracket; 11. First Frame; 12. Second Frame; 13. Light Passing Port; 20. Transmitting Light Source Assembly; 21. Laser; 22. First Lens; 23. Second Lens; 24. Transmitting Diaphragm; 30. Photoelectric Detector; 40. Reflection Structure; 50. Polarizing Beam Splitting Structure; 60. Reflector; 70. Receiving Lens; 80. Filter; 90. Window Mirror; 200. Object to be Measured; 300. Light Ray; 310. First Light Beam; 320. Second Light Beam. Detailed Embodiment
[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. 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. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. 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.
[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.
[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.
[0028] In the present utility model, unless otherwise clearly specified and defined, the first feature being “above” or “below” the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being “above”, “over” and “on top of” the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being “below”, “under” and “beneath” the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.
[0029] Please refer to Figures 1 to 5 , an optical module is provided in an embodiment of the present application, which includes a reflection structure 40, a polarization beam splitting structure 50, a light emitting source assembly 20 for emitting light 300 towards the polarization beam splitting structure 50, a reflector 60 spaced apart from the polarization beam splitting structure 50, and a photodetector 30 disposed on the same side of the reflector 60 as the light emitting source assembly 20. The space between the polarization beam splitting structure 50 and the reflector 60 is used to dispose a to-be-detected object 200. The light 300 emitted by the light emitting source assembly 20 passes through the polarization beam splitting structure 50 and irradiates towards the reflector 60. The polarization beam splitting structure 50 is configured to transmit the light 300 reflected back by the to-be-detected object 200, or to reflect the light 300 reflected back by the reflector 60 to the photodetector 30. The reflection structure 40 is configured to reflect the light 300 emitted by the light emitting source assembly 20 to the polarization beam splitting structure 50.
[0030] Specifically, the photodetector 30 can receive the irradiation of the light 300 from the polarization beam splitting structure 50, convert the optical signal into an electrical signal, and output the electrical signal.
[0031] The optical module according to the embodiment of the present application can be applied to a laser sensor, and can detect whether the object to be measured 200 exists. The specific measurement principle is as follows: When the object to be measured 200 does not exist, the light beam 300 reflected by the reflection structure 40 can pass through the polarization beam splitter structure 50 and irradiate on the reflector 60. The reflector 60 can reflect the light beam 300 and change the polarization direction of the light beam 300. When the light beam 300 reflected by the reflector 60 reaches the polarization beam splitter structure 50 again, since the polarization direction of the light beam 300 has changed, the polarization beam splitter structure 50 no longer transmits the light beam 300 but reflects the light beam 300, and reflects the light beam 300 to the photodetector 30. Therefore, the photodetector 30 can receive the optical signal; when the object to be measured 200 exists, the light beam 300 reflected by the reflection structure 40 can pass through the polarization beam splitter structure 50 and irradiate on the object to be measured 200. Since the polarization direction of the light beam 300 does not change after being reflected by the object to be measured 200, when the light beam 300 reflected by the object to be measured 200 reaches the polarization beam splitter structure 50 again, the polarization beam splitter structure 50 can still transmit the light beam 300. Therefore, the photodetector 30 cannot receive the optical signal. Therefore, it can be determined whether the object to be measured 200 exists according to whether the photodetector 30 receives the optical signal.
[0032] It can be understood that the light beam 300 emitted by the light source assembly 20 may include a first light beam 310 and a second light beam 320. The polarization directions of the first light beam 310 and the second light beam 320 are different. When the light beam 300 reflected by the reflection structure 40 reaches the polarization beam splitter structure 50, the polarization beam splitter structure 50 transmits the first light beam 310 and reflects the second light beam 320. After the first light beam 310 is reflected by the reflector 60, the polarization direction changes and becomes the same as that of the second light beam 320, so that it can be reflected by the polarization beam splitter structure 50 to the photodetector 30.
[0033] Specifically, the polarization beam splitter structure 50 is a polarization beam splitter prism, which is formed by coating a multilayer film structure on the inclined surface of a right-angle prism and then gluing it into a cube structure. Further, the first light beam 310 is a P-polarized light, and the second light beam 320 is an S-polarized light. The P-polarized light refers to the vibration direction of the light beam being parallel to the incident plane, and the S-polarized light refers to the vibration direction of the light beam being perpendicular to the incident plane. When the incident angle of the light beam satisfies the condition of the Brewster angle, the reflectivity of the P-polarized light is 0. By controlling the film layer, the transmittance of the P-polarized light is close to 1, and the reflectivity of the S-polarized light is close to 1. Therefore, most of the first light beam 310 is transmitted, and most of the second light beam 320 is reflected.
[0034] It should be noted that when the light beam is incident on the film layer of the polarization beam splitter prism in the air, since the refractive index of the air is relatively small, it is not easy to reach the Brewster angle condition. Therefore, the film layer must be encapsulated inside the glued prism.
[0035] Understandably, the optical module further includes a controller, which is communicatively connected to the emission light source assembly 20 and the photodetector 30 respectively. The controller is used to control the working state of the emission light source assembly 20 and to receive the signals sent by the photodetector 30.
[0036] The controller can be a measurement and control circuit with a microprocessor as the core. The controller can control the time when the emission light source assembly 20 emits the light beam 300, the intensity of the emitted light beam 300, the duration of the emitted light beam 300, etc. After the light beam 300 reflected by the polarization beam splitting structure 50 is collected by the photodetector 30, the photodetector 30 can send an electrical signal to the controller. In addition, the reflection structure 40 can be a reflector.
[0037] In the optical module provided by the present application, by providing the polarization beam splitting structure 50, when there is no object to be measured 200, the reflector 60 can reflect the light beam 300 and change the polarization direction of the light beam 300. The polarization beam splitting structure 50 reflects the light beam 300 reflected by the reflector 60 to the photodetector 30, so that the photodetector 30 can receive the optical signal; when there is an object to be measured 200, the polarization direction of the light beam 300 does not change after being reflected by the object to be measured 200, and the polarization beam splitting structure 50 transmits the light beam 300 reflected by the object to be measured 200, so that the photodetector 30 does not receive the optical signal. Therefore, the present application can determine whether the object to be measured 200 exists according to whether the photodetector 30 receives the optical signal, and the reflection structure 40 can turn the light beam 300 between the polarization beam splitting structure 50 and the emission light source assembly 20, thereby folding the optical path between the polarization beam splitting structure 50 and the emission light source assembly 20, thereby reducing the distance between the emission light source assembly 20 and the photodetector 30 along the direction of the polarization beam splitting structure 50 pointing to the reflector 60, thereby being able to reduce the size of the module bracket 10, and further being able to reduce the volume of the laser sensor.
[0038] In the embodiment of the present application, the optical path between the polarization beam splitting structure 50 and the photodetector 30 is parallel to the optical path between the reflection structure 40 and the emission light source assembly 20, that is, the emission optical path and the reception optical path of the optical module are parallel to each other, so as to be able to reasonably layout the space inside the laser sensor, improve the aesthetics, and at the same time further reduce the volume of the laser sensor.
[0039] Understandably, in the embodiment of the present application, through the reflection of the reflection structure 40, the incident light direction and the reflection light direction of the reflection structure 40 are perpendicular to each other. The reflection structure 40, the polarization beam splitting structure 50 and the reflector 60 are on the same axis, and the direction of this axis is perpendicular to the emission optical path and the reception optical path.
[0040] In some embodiments, the optical module further includes a module bracket 10, and the emission light source assembly 20, the photodetector 30, the reflection structure 40, and the polarization beam splitting structure 50 are all arranged on the module bracket 10. In the embodiments of the present application, the emission light source assembly 20, the photodetector 30, the reflection structure 40, and the polarization beam splitting structure 50 are installed together, which can overcome the problem that it is difficult to ensure the accuracy and stability of the positions between multiple optical elements, thereby improving the stability of the laser sensor.
[0041] A fixing structure can be provided on the module bracket 10 to fix the emission light source assembly 20, the photodetector 30, the reflection structure 40, and the polarization beam splitting structure 50. The emission light source assembly 20, the photodetector 30, the reflection structure 40, and the polarization beam splitting structure 50 can be fixed to the module bracket 10 by connection means such as snap connection or bonding. The module bracket 10 can also be provided with an opening for passing cables to connect internal optical or electrical devices.
[0042] The shape of the module bracket 10 can be flexibly set according to actual situations. In addition, the material of the module bracket 10 can be polyester or metal material, etc.
[0043] It should be noted that the photodetector 30 can be a semiconductor photodetector 30. The semiconductor photodetector 30 has extremely high sensitivity, can detect and measure weak optical signals, and has a very fast response speed, enabling fast optical signal detection and processing. In addition, the semiconductor photodetector 30 has excellent response capabilities in different wavelength ranges and can be applied to various optical signal detections and measurements. Compared with traditional photodetectors, the semiconductor photodetector 30 has lower power consumption and a smaller volume, which can effectively save energy and be environmentally friendly.
[0044] In some embodiments, the module bracket 10 is provided with a light passing port 13, and the polarization beam splitting structure 50 is arranged corresponding to the light passing port 13. Both the incident light path and the outgoing light path of the polarization beam splitting structure 50 pass through the light passing port 13. The light passing port 13 can be parallel to one side of the module bracket 10, making the structure of the entire optical module more tidy.
[0045] Furthermore, a window mirror 90 is provided at the light passing port 13. The light 300 transmitted through the polarization beam splitting structure 50 passes through the window mirror 90 and irradiates the object to be measured 200 or the reflector 60, and the light 300 reflected by the object to be measured 200 or the reflector 60 passes through the window mirror 90 again and irradiates the polarization beam splitting structure 50. The window mirror 90 can allow light 300 of a specific wavelength to pass through better. At the same time, the window mirror 90 can be arranged on the outer shell surface of the sensor, which can play a role in dust prevention and protection.
[0046] In some embodiments, the module bracket 10 includes a first bracket body 11 and a second bracket body 12. The emitting light source assembly 20 and the photodetector 30 are installed on the first bracket body 11. One end of the second bracket body 12 is fixedly connected to the first bracket body 11. The second bracket body 12 separates the emitting light source assembly 20 and the photodetector 30. The second bracket body 12 extends along a first direction. The reflection structure 40 and the polarization beam splitting structure 50 are arranged on opposite sides of the second bracket body 12. The second bracket body 12 is provided with a light transmission opening. The light 300 reflected by the reflection structure 40 passes through the light transmission opening and irradiates towards the polarization beam splitting structure 50.
[0047] Understandably, the second bracket body 12 can separate the optical path between the polarization beam splitting structure 50 and the photodetector 30 and the optical path between the reflection structure 40 and the emitting light source assembly 20, avoiding mutual interference between the emitting optical path and the receiving optical path, thereby improving the detection sensitivity and detection accuracy of the laser sensor.
[0048] In some embodiments, the optical module further includes a receiving lens 70. The receiving lens 70 is arranged on the module bracket 10. The light 300 reflected by the polarization beam splitting structure 50 is focused on the photodetector 30 after passing through the receiving lens 70. The receiving lens 70 can play a role in concentrating light, so that the light spots reflected from different positions can be focused on the photodetector 30.
[0049] In some embodiments, the emitting light source assembly 20 includes a laser 21, a first lens 22, and a second lens 23. The first lens 22 and the second lens 23 are arranged at intervals. The light 300 emitted by the laser 21 passes through the first lens 22 and the second lens 23 in sequence and then emits. The first lens 22 and the second lens 23 are arranged on the module bracket 10. The first lens 22 and the second lens 23 are used to converge the divergent light beam emitted by the laser 21 into a collimated light beam and shape the divergent light beam emitted by the laser 21, so that the measurement accuracy can be improved.
[0050] Specifically, the laser 21 is a semiconductor laser diode. A semiconductor laser diode is a device that converts electrical energy into laser. Compared with other types of lasers, the semiconductor laser diode is smaller and lighter, with a smaller volume and lighter weight, which makes them suitable for integration into various optoelectronic devices. And the semiconductor laser diode has high stability, relatively stable output laser frequency and power, and can withstand greater mechanical vibration and shock, with higher reliability. It can be understood that the above-mentioned emitting light source assembly 20 can also adopt other forms, not limited to the forms already mentioned in the above embodiments, as long as it can achieve the function of emitting laser.
[0051] In some embodiments, the emitting light source assembly 20 also includes an emitting aperture 24. The light 300 passing through the first lens 22 and the second lens 23 is irradiated to the reflective structure 40 through the emitting aperture 24. The emitting aperture 24 is used to limit the beam width of the light 300. At the same time, it can reduce unnecessary light 300 and effectively avoid the interference of stray light, which helps to better control the quality, size and shape of the light 300 after being shaped by the first lens 22 and the second lens 23.
[0052] In addition, a filter 80 is provided between the photodetector 30 and the receiving lens 70 , and the filter 80 is used to pass the light 300 of a preset wavelength, thereby filtering out the unwanted light 300 , and preventing the ambient light from interfering with the signal and affecting the accuracy of the detection.
[0053] The present application also proposes a laser sensor, which includes an optical module. The specific structure of the optical module refers to the above-mentioned embodiment. Since the laser sensor adopts all the technical solutions of all the above-mentioned embodiments, it also has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.
[0054] In summary, the optical module provided by the present application is provided with a polarization splitting structure 50. When the object to be tested 200 is not present, the reflector 60 can reflect the light 300 and change the polarization direction of the light 300. The polarization splitting structure 50 reflects the light 300 reflected by the reflector 60 to the photodetector 30, so the photodetector 30 can receive the optical signal. When the object to be tested 200 is present, the polarization direction of the light 300 does not change after the light 300 is reflected by the object to be tested 200. The polarization splitting structure 50 transmits the light 300 reflected by the object to be tested 200. The photodetector 30 cannot receive the light signal, so the present application can determine whether the object to be tested 200 exists based on whether the photodetector 30 receives the light signal, and the reflective structure 40 can bend the light 300 between the polarization splitting structure 50 and the emitting light source assembly 20, thereby folding the light path between the polarization splitting structure 50 and the emitting light source assembly 20, thereby reducing the distance between the emitting light source assembly 20 and the photodetector 30 along the direction of the polarization splitting structure 50 pointing to the reflector 60, thereby reducing the size of the module bracket 10, and then reducing the volume of the laser sensor.
[0055] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims
1. An optical module, characterized in that: It includes a reflection structure (40), a polarization beam splitting structure (50), an emission light source assembly (20) for emitting light (300) to the polarization beam splitting structure (50), a reflector (60) spaced from the polarization beam splitting structure (50), and a photodetector (30) disposed on the same side of the reflector (60) as the emission light source assembly (20). A space between the polarization beam splitting structure (50) and the reflector (60) is for disposing a to-be-detected object (200). The light (300) emitted by the emission light source assembly (20) passes through the polarization beam splitting structure (50) and irradiates toward the reflector (60). The polarization beam splitting structure (50) is for passing the light (300) reflected back by the to-be-detected object (200), or for reflecting the light (300) reflected back by the reflector (60) to the photodetector (30). The reflection structure (40) is for reflecting the light (300) emitted by the emission light source assembly (20) to the polarization beam splitting structure (50).
2. The optical module according to claim 1, wherein: The optical path between the polarization beam splitting structure (50) and the photodetector (30) is parallel to the optical path between the reflection structure (40) and the emission light source assembly (20).
3. The optical module according to claim 2, wherein: The optical module further includes a module bracket (10), and the emission light source assembly (20), the photodetector (30), the reflection structure (40), and the polarization beam splitting structure (50) are all arranged on the module bracket (10).
4. The optical module according to claim 3, wherein: The module bracket (10) is provided with a light passing port (13), the polarization beam splitting structure (50) is disposed corresponding to the light passing port (13), and both the light incident path and the light exiting path of the polarization beam splitting structure (50) pass through the light passing port (13).
5. The optical module according to claim 3, wherein: The module bracket (10) includes a first bracket body (11) and a second bracket body (12). The emission light source assembly (20) and the photodetector (30) are installed on the first bracket body (11). One end of the second bracket body (12) is fixedly connected to the first bracket body (11). The second bracket body (12) separates the emission light source assembly (20) and the photodetector (30). The second bracket body (12) extends in a first direction. The reflection structure (40) and the polarization beam splitting structure (50) are disposed on opposite sides of the second bracket body (12). The second bracket body (12) is provided with a light transmitting port, and the light (300) reflected by the reflection structure (40) passes through the light transmitting port and irradiates toward the polarization beam splitting structure (50).
6. The optical module according to claim 3, characterized in that: The optical module further includes a receiving lens (70). The receiving lens (70) is disposed on the module bracket (10), and the light (300) reflected by the polarization beam splitting structure (50) is focused on the photodetector (30) after passing through the receiving lens (70).
7. The optical module according to claim 3, wherein: The emission light source assembly (20) includes a laser (21), a first lens (22), and a second lens (23). The light beam (300) emitted by the laser (21) passes through the first lens (22) and the second lens (23) in sequence and then exits. The first lens (22) and the second lens (23) are configured to converge the divergent light beam emitted by the laser (21) into a collimated light beam, and the first lens (22) and the second lens (23) are disposed on the module bracket (10).
8. The optical module according to claim 7, characterized in that: The emission light source assembly (20) further includes an emission aperture (24). The light beam (300) passing through the first lens (22) and the second lens (23) irradiates the reflection structure (40) after passing through the emission aperture (24), and the emission aperture (24) is used to limit the beam width of the light beam (300).
9. The optical module according to claim 6, wherein: A filter (80) is disposed between the photodetector (30) and the receiving lens (70), and the filter (80) is configured to pass the light beam (300) of a preset wavelength.
10. A laser sensor, characterized in that: The laser sensor includes the optical module according to any one of claims 1 to 9.