Safety light curtain optical transceiver

Abstract

The invention discloses a safety light curtain optical transceiving device. The safety light curtain optical transceiving device comprises a shell, a light curtain and a light curtain, wherein the shell is provided with a containing cavity and an opening communicated with the containing cavity; the support is provided with a light-transmitting channel corresponding to the opening, the aperture of the end, close to the opening, of the light-transmitting channel is D, the support is arranged in the containing cavity, the lens is arranged at the end, close to the opening, of the light-transmitting channel, the focal length of the lens is f, and the range of f / D is 1.18-1.77; the light transmitting and receiving module is located at the end, away from the opening, of the light transmitting channel. According to the invention, the ratio of the focal length of the lens to the aperture of the light-transmitting channel is controlled within the range of 1.18-1.77, so that the light-transmitting channel hole does not diverge too much light beams under the condition that the focal length of the lens is reduced, reflected light of a background object is reduced, light emitted or received by the light receiving and transmitting module is easier to align, and the light receiving and transmitting module is more convenient to use. The effective detection distance can be guaranteed, and the thickness of the safety light curtain optical transceiver is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of safety light curtain sensors, and in particular to an optical transceiver of a safety light curtain. Background Art

[0002] Safety light curtain is an industrial detection device that uses a transmitter to continuously emit a detection beam (such as infrared rays) so that the detection beam can form a light curtain between the transmitter and the receiver. When the light curtain is blocked or partially blocked, the control subject will judge whether there is an object invading the light curtain area according to the receiving state of the detection beam by the receiver and make corresponding response actions; it is widely used in the field of industrial production, such as detecting whether a human body enters or a limb extends into a dangerous area, detecting whether the workpiece on the conveyor has reached the predetermined position, and measuring the external dimensions of the object. The optical system of the safety light curtain consists of two parts, namely the light transmitter and the light receiver, both of which are composed of light emitting units and light receiving units arranged in a linear array, and correspond one to one. The light transmitter emits modulated infrared light, which is received by the light receiver to form a protective net. When an object (such as the operator's body) enters the protective net, when the light is blocked by the object, it will respond immediately through the internal control circuit. If any part of the object (such as the operator's body) blocks the light, the machine will enter a safe state without causing harm to the operator.

[0003] In the optical technology used in existing safety light curtains, the light emitting unit of the light transmitter usually uses a light emitting diode (LED) as the light source, and the light is collimated by an optical lens and then emitted to the light receiver, which is then received by the light receiving unit corresponding to the light receiver. In order to meet the requirements of installation and use, the light transmitter and light receiver of the safety light curtain need to be thin, have a long detection distance, and have a strong ability to prevent background objects from reflecting light.

[0004] Since the thickness of the light transmitter is mainly determined by the total optical length of the light transmitting unit (i.e., the distance from the light source chip to the final light emitting surface of the optical lens), the thickness of the light receiver is also the same. However, if the thickness of the light transmitter is to be thin, the total optical length of the light transmitting unit must be reduced, and the effective focal length of the light transmitting unit must be reduced; as the effective focal length decreases, the divergence of the emitted light beam will inevitably increase, making it more difficult to align the light transmitting unit with the light receiving unit, and it will also lead to an increase in the reflected light of the background, an increase in the probability of false response, and a decrease in the effective detection distance. The conflict between the effective focal length and the divergence of the light beam makes it difficult to reduce the thickness of the safety light curtain device. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the problem that the thickness of the safety light curtain device is difficult to reduce due to the conflict between the effective focal length and the degree of light beam divergence.

[0006] In order to solve the above technical problems, the present invention provides a safety light curtain optical transceiver device, including: a shell, the shell is provided with a accommodating cavity and an opening connected to the accommodating cavity; a bracket, the bracket is arranged in the accommodating cavity, the bracket is provided with a light-transmitting channel corresponding to the opening, and the aperture of the light-transmitting channel close to the opening is D; a lens, the lens is arranged on the end of the light-transmitting channel close to the opening, the focal length of the lens is f, and the range of f / D is 1.18-1.77; a light transceiver module, the light transceiver module is located at the end of the light-transmitting channel away from the opening.

[0007] Furthermore, the light-transmitting channel includes a cylindrical channel and a conical channel, one end of the cylindrical channel corresponds to the opening, the other end of the cylindrical channel is connected to the conical channel, and the radius of the conical channel gradually increases towards the opening.

[0008] Furthermore, the opening radius is the same as the cylindrical channel radius.

[0009] Furthermore, the lens aperture is the same as the diameter of the cylindrical channel.

[0010] Furthermore, the light transceiver module includes a transmitting circuit board and a light emitting diode arranged on the transmitting circuit board, the transmitting circuit board is arranged on the accommodating cavity, and the light emitting diode corresponds to the light-transmitting channel.

[0011] Furthermore, the optical transceiver module includes a receiving circuit board and a photodiode arranged on the receiving circuit board, the receiving circuit board is arranged on the accommodating cavity, and the photodiode corresponds to the light-transmitting channel.

[0012] Furthermore, the lens is one of a biconvex lens, a plano-convex lens, and a Fresnel lens.

[0013] Furthermore, the housing and the bracket are processed into an integrally formed component.

[0014] Furthermore, the lens is provided with a groove, and the bracket is provided with a protrusion matching the groove.

[0015] Furthermore, the opening is provided with a lens dust cover.

[0016] Compared with the prior art, the optical transceiver device of a safety light curtain according to an embodiment of the present invention has the beneficial effect that by controlling the ratio of the focal length of the lens to the aperture of the light-transmitting channel within the range of 1.18-1.77, when the focal length of the lens is reduced, the hole of the light-transmitting channel will not allow the light beam to diverge too much, thereby reducing the reflected light from the background, making it easier to align the light transceiver module to transmit or receive light, thereby ensuring the effective detection distance and reducing the thickness of the optical transceiver device of the safety light curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of the optical transceiver of the safety light curtain provided by the present invention;

[0018] Figure 2 This is a cross-sectional view of a scenario application of the optical transceiver of the safety light curtain provided by the present invention;

[0019] Figure 3 is a cross-sectional view of a lens of the optical transceiver of the safety light curtain provided by the present invention;

[0020] Figure 4 is a cross-sectional view of a bracket of the optical transceiver of the safety light curtain provided by the present invention;

[0021] Figure 5 is a cross-sectional view of a light emitting diode of an optical transceiver of a safety light curtain provided by the present invention;

[0022] Figure 6 It is a cross-sectional view of a photodiode of the optical transceiver of the safety light curtain provided by the present invention.

[0023] The corresponding relationship between the reference numerals and the component names is as follows:

[0024] 1. Shell; 11. Accommodating chamber; 12. Opening; 13. Lens dust cover;

[0025] 2. Bracket; 21. Light-transmitting channel; 211. Cylindrical channel; 212. Conical channel; 22. Protrusion;

[0026] 3. Lens; 31. Groove;

[0027] 4. Light transceiver module; 41. Transmitter circuit board; 42. Light emitting diode; 421. Light emitting chip; 43. Receiving circuit board; 44. Photodiode; 441. Light receiving surface of photodiode;

[0028] 5. Beam 1;

[0029] 6. Beam 2;

[0030] 7. Background objects. DETAILED DESCRIPTION

[0031] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0032] like Figures 1 to 6 As shown, an embodiment of the present invention discloses a safety light curtain optical transceiver device, comprising: a housing 1, a bracket 2, a lens 3 and a light transceiver module 4.

[0033] Among them, the shell 1 is provided with a accommodating cavity 11 and an opening 12 connected to the accommodating cavity 11; the bracket 2 is provided with a light-transmitting channel 21 corresponding to the opening 12, the aperture of the light-transmitting channel 21 close to the opening 12 is D, the bracket 2 is arranged in the accommodating cavity 11, the lens 3, the lens 3 is arranged on the end of the light-transmitting channel 21 close to the opening 12, the focal length of the lens 3 is f, and the range of f / D is 1.18-1.77; the light transceiver module 4, the light transceiver module 4 is located at the end of the light-transmitting channel 21 away from the opening 12.

[0034] The optical transceiver device of the safety light curtain of the present application controls the ratio of the focal length of the lens 3 to the aperture of the light-transmitting channel 21 within the range of 1.18-1.77, so that when the focal length of the lens 3 is reduced, the hole of the light-transmitting channel 21 will not allow the light beam to diverge too much, thereby reducing the reflected light of the background object 7, making it easier to align the light transceiver module 4 to transmit or receive light, thereby ensuring the effective detection distance and reducing the thickness of the optical transceiver device of the safety light curtain.

[0035] By setting a reasonable light transmission channel 21 and lens 3 focal length, light can be quickly and accurately emitted and received while the thickness of the device is reduced, thereby improving the response speed of safety detection, contributing to industrial automation and safety protection, and identifying potential dangers in a timely manner. The light transceiver module 4 emits or receives light through the lens 3 and light transmission channel 21 to form a safety light curtain.

[0036] When the ratio of the focal length f of the lens 3 to the aperture D of the light-transmitting channel 21 is set within the range of 1.18-1.77, the focusing performance and divergence of the light beam can be effectively controlled, so that the light beam can maintain a high intensity and good directivity during propagation, ensuring the effective coverage range of the light and improving the detection accuracy. At the same time, the light-transmitting channel 21 can significantly reduce the interference of background light on the signal, especially in complex or multi-light source environments, reduce the reflected light and light effect of the background object 7, effectively isolate the influence of external light sources, ensure the accurate reception of the main signal, and improve the overall reliability. Finally, through the compact layout and thinning characteristics, it is easier to integrate into various devices and environments, and the adaptability in different application scenarios is enhanced, so that the light curtain can be widely used in many fields such as industry, transportation, and public safety. When the ratio of the focal length f of the lens 3 to the aperture D of the light-transmitting channel 21 is less than 1.18, the light beam will diverge too much, reducing the detection accuracy; when the ratio of the focal length f of the lens 3 to the aperture D of the light-transmitting channel 21 is greater than 1.18, the focal length is large relative to the aperture D, making it difficult to reduce the thickness of the device.

[0037] Table 1 Transmitting / receiving lens sagittal height table (with vertex as origin)

[0038] Aperture radius (mm) 0.00 0.50 1.00 1.50 2.00 2.50 Rise height(mm) 0.000000 -0.028737 -0.116370 -0.267664 -0.492842 -0.813396

[0039] like Figure 1 and Figure 2 As shown, in an optional embodiment of the present invention, the light-transmitting channel 21 includes a cylindrical channel 211 and a conical channel 212, one end of the cylindrical channel 211 corresponds to the opening 12, and the other end of the cylindrical channel 211 is connected to the conical channel 212, and the radius of the conical channel 212 gradually increases towards the opening 12.

[0040] The cylindrical channel 211 can provide a stable light beam transmission path to ensure that the loss of light during the transmission process is minimized. The gradually increasing radius of the conical channel 212 can effectively aggregate the light, help improve the propagation efficiency of the light, ensure that more light energy reaches the receiving end, and reduce the interference of background light on the light signal. The conical channel 212 allows the light to be gradually focused before entering the opening 12, thereby improving the intensity and concentration of the light beam, helping to improve the safety of detecting tiny objects or low-reflection surfaces, and ensuring higher detection accuracy in complex environments.

[0041] The combination of the cylindrical channel 211 and the conical channel 212 can limit the entry of non-target light, ensure the clarity and accuracy of the signal, effectively suppress the interference of the background light source, and improve the anti-interference ability. The combination of the cylindrical and conical channels 212 can reasonably disperse the pressure and heat of the light on the channel wall, reduce the probability of damage caused by long-term use, and enhance the durability and reliability of the device.

[0042] like Figure 2 and Figure 4 As shown, in an optional embodiment of the present invention, the radius of the opening 12 is the same as the radius of the cylindrical channel 211 .

[0043] By making the radius of the opening 12 the same as the radius of the cylindrical channel 211, it is ensured that the light will not be scattered or deviated when entering the channel, so that the light remains stable during transmission, reducing the loss of light intensity and improving the overall performance of the system. The uniform opening 12 and channel radius simplifies the complexity of the optical channel, making it easier to calculate and predict the propagation behavior of light in the system, thereby reducing the difficulty of manufacturing.

[0044] Since there is no size difference between the opening 12 and the cylindrical channel 211, the light can enter the channel at the best angle, which improves the focusing accuracy of the light beam, helps detect tiny objects or low-reflection surfaces, and ensures the reliability of safety detection. The consistency of the radius of the opening 12 and the radius of the channel reduces the reflection and refraction loss caused by the light entering the channel, optimizes the light transmission path, ensures that more light energy reaches the receiving end effectively, reduces the interference of external light sources on the light, enhances the system's sensitivity to the target signal, and helps improve the accuracy of detection.

[0045] like Figure 1 and Figure 2 As shown, in an optional embodiment of the present invention, the aperture of the lens 3 is the same as the diameter of the cylindrical channel 211. By making the aperture of the lens 3 consistent with the diameter of the cylindrical channel 211, it is possible to ensure that the light enters the channel in the best path, reduce the light loss caused by size mismatch, improve the transmission efficiency of the light, and enable more light energy to effectively reach the light transceiver module 4. Consistent aperture and channel diameter contribute to the uniform distribution of the light beam, avoid scattering or distortion of the light when passing through the lens 3, thereby improving the imaging quality. Since the light can pass through the aperture and channel smoothly, the wear caused by the refraction and reflection of the light is reduced, which helps to extend the service life of the optical components and reduce the maintenance frequency and cost.

[0046] like Figure 2 and Figure 5 As shown, in an optional embodiment of the present invention, the light transceiver module 4 includes a transmitting circuit board 41 and a light-emitting diode 42 arranged on the transmitting circuit board 41, the transmitting circuit board 41 is arranged on the accommodating cavity 11, and the light-emitting diode 42 corresponds to the light-transmitting channel 21.

[0047] By making the light emitting diode 42 and the light-transmitting channel 21 correspond to each other, the accurate positioning of the light source is ensured, so that the emitted light can directly enter the light-transmitting channel 21, reducing the loss caused by the beam deviation and improving the efficiency of light transmission. Fixing the transmitting circuit board 41 in the accommodating cavity 11 makes the light emitting diode 42 more stable during operation, reduces the displacement caused by vibration or external force, and helps to maintain consistent light emission intensity. The integrated design of the light transceiver module 4 makes the installation process easier and the arrangement of the device can be easily completed. At the same time, due to the modular design of the light emitting diode 42 and the transmitting circuit board 41, the subsequent maintenance and replacement also become more efficient, reducing the maintenance cost. The light emitting diode 42 is directly arranged on the transmitting circuit board 41 and corresponds to the light-transmitting channel 21, which helps to optimize the propagation path of the light and minimize the scattering and attenuation of the light during the transmission process, thereby improving the detection accuracy of the light curtain.

[0048] Specifically, the light emitting diode 42 includes a light emitting chip 421 .

[0049] like Figure 2 and Figure 6 As shown, in an optional embodiment of the present invention, the optical transceiver module 4 includes a receiving circuit board 43 and a photodiode arranged on the receiving circuit board 43 , the receiving circuit board 43 is arranged on the accommodating cavity 11 , and the photodiode corresponds to the light-transmitting channel 21 .

[0050] By accurately aligning the photodiode with the light-transmitting channel 21, it is ensured that the optical signal can directly enter the photodiode, reducing the scattering and loss of the optical signal during the transmission process, thereby improving the accuracy of optical signal reception and ensuring that the detected object can be effectively identified. The integration of the receiving circuit board 43 and the photodiode improves the sensitivity of the light curtain system to weak optical signals, allowing the device to maintain good working performance in low-light or complex environments and adapt to different application requirements. The close combination of the receiving circuit board 43 and the photodiode reduces the impact of external electromagnetic interference on signal reception, thereby improving the stability of the system. Users can obtain more reliable optical signal feedback during use to ensure that safety is not affected. Specifically, the photodiode is provided with a photodiode light-receiving surface.

[0051] like Figure 1 and Figure 3As shown, in an optional embodiment of the present invention, the lens 3 is one of a biconvex lens 3, a plano-convex lens 3, and a Fresnel lens 3. The biconvex lens 3 can effectively focus the light, making the light beam more concentrated, thereby increasing the intensity of the optical signal, and improving the receiver's ability to respond to weak signals, thereby enhancing the detection sensitivity of the device. The plano-convex lens 3 can reduce light loss, ensuring that more light can be transmitted to the receiving module through the lens 3, thereby improving the overall working efficiency of the system, especially in an environment with insufficient light. The Fresnel lens 3 can effectively reduce the scattering of light during propagation, so that the device can maintain a high signal quality in a complex environment, ensure reliable safety detection, and can significantly reduce the volume of the light curtain device, making it easier to install and arrange. At the same time, it also makes the device more adaptable in occasions where space is limited.

[0052] By diversifying the lens 3, users can choose the most suitable lens 3 type according to specific application requirements, so that the safety light curtain can be widely used in various scenarios to meet different usage requirements. The reasonable selection of lens 3 can effectively reduce the interference of external light sources and ensure that the device can still operate stably under strong light or complex lighting conditions. The use of lightweight materials such as Fresnel lens 3 can reduce production and material costs. At the same time, due to its simple structure and relatively mature manufacturing process, it further reduces production time and labor costs.

[0053] like Figure 1 and Figure 2 As shown, in an optional embodiment of the present invention, the housing 1 and the bracket 2 are processed into an integrally formed component. By integrating the housing 1 and the bracket 2, the connection points in the traditional assembly structure are eliminated, the strength and rigidity of the overall structure are enhanced, the risk of deformation or damage under various working conditions is reduced, and the long-term stable operation of the light curtain device is ensured. The integrally formed component makes the installation process simpler, and no longer requires complicated assembly steps. It only needs to fix the entire component, which saves installation time and improves work efficiency. Integrated processing can reduce the number of components, thereby reducing production and management costs. By reducing the number of parts, the complexity of material procurement, processing and subsequent maintenance is reduced, and the overall manufacturing cost is correspondingly reduced. The integrally formed component can provide better sealing, effectively prevent external factors such as dust and moisture from entering the interior of the device, ensure the cleanliness of the optical components, and extend the service life of the device.

[0054] By integrating the housing 1 and the bracket 2, the overall structure can better resist vibration and impact, reducing the possibility of failure in harsh environments. The overall molding makes the device more compact in spatial layout and easy to install in a limited space. By reducing the number of connectors and splicing parts, the overall molding structure reduces potential failure points, improves reliability, helps reduce failures caused by loose connections or aging, and enhances stability.

[0055] In an optional embodiment of the present invention, the housing 1 is provided with a fixing groove for fixing the bracket 2. By providing the fixing groove in the housing 1, a stable installation base is provided for the bracket 2, the shaking and displacement of the bracket 2 during use are reduced, the accuracy and reliability of the light curtain device during operation are ensured, and the overall performance is improved. The fixing groove makes the installation of the bracket 2 more intuitive and simple, and the bracket 2 only needs to be inserted into the groove and fixed, which reduces the complicated steps in the installation process. In addition, if the bracket 2 needs to be maintained or replaced, the operation is also more convenient, saving time and labor costs.

[0056] By allowing the bracket 2 to be firmly fixed in the groove of the housing 1, the risk of damage caused by external impact or vibration is reduced, and the service life of the device can be effectively extended, especially in high-intensity operating environments. The fixing groove allows the bracket 2 to be compactly installed inside or outside the housing 1, thereby saving installation space, facilitating installation in application scenarios with limited space, and enabling the device to better adapt to various environments. The embedded structure of the fixing groove makes the connection between the bracket 2 and the housing 1 neater and reduces exposed connectors. The multiple fixing grooves on the housing 1 allow the position of the bracket 2 to be adjusted and replaced according to actual needs, increasing the flexibility and adjustability of the device. The fixing groove can effectively prevent the bracket 2 from accidentally falling off or loosening, ensuring the safety of the device during operation, and helping to further reduce safety hazards. The stable connection achieved through the fixing groove can better support the precise alignment of optical components, improve the detection performance and response speed of the light curtain device, and thus improve the overall work efficiency.

[0057] like Figure 3 and Figure 4 As shown, in an optional embodiment of the present invention, a groove 31 is provided on the side of the lens 3 close to the bracket 2, and the bracket 2 is provided with a protrusion 22 matching the groove. By providing matching protrusions and grooves on the lens 3 and the bracket 2, the lens 3 can be stably installed on the bracket 2, and the protrusion 22 helps the lens 3 to be docked and positioned on the bracket 2, which is convenient for installation. Specifically, the protrusion 22 is located at the opening of the light-transmitting channel 21 close to one end of the lens 3.

[0058] like Figure 1 and Figure 2As shown, in an optional embodiment of the present invention, the opening 12 is provided with a dust cover 13 for the lens 3. The dust cover 13 for the lens 3 effectively blocks the entry of dust, dirt and other contaminants, ensures that the optical element is always kept clean, can reduce the optical attenuation caused by dirt, and maintain the accurate detection capability of the device. By preventing the intrusion of external contaminants, the dust cover 13 for the lens 3 can significantly extend the service life of the optical element. A clean optical surface can reduce the risk of aging and damage, thereby reducing the frequency of maintenance and replacement, and reducing the cost of long-term use. Since the dust cover 13 for the lens 3 effectively prevents the accumulation of contaminants, the user can greatly reduce the frequency of cleaning the lens 3 during daily maintenance. The presence of the dust cover enables the light curtain device to still work stably under harsh environmental conditions, such as industrial sites with a lot of dust, thereby enhancing the reliability of the device. This design is crucial to ensuring industrial safety, especially in applications requiring high-precision detection. The dust cover 13 for the lens 3 can protect the optical element from accidental damage caused by external factors, thereby reducing the failure rate of the device and improving overall safety. This is particularly important in applications involving personal safety, which helps to reduce potential safety hazards. Specifically, the material of the dust cover 13 of the lens 3 is one of polycarbonate, polypropylene and silicone.

[0059] like Figure 1 and Figure 2 As shown, in an optional embodiment of the present invention, the light beam emitted by the light emitting chip 421 of the light emitting diode 42 of the light transceiver module 4 passes through the light transmission channel 21 of the transmitting bracket 2 and is condensed and shaped by the lens 3 to emit a light beam 5. Part of the light of the light beam 5 is then focused by the lens 3 and reaches the light receiving surface of the photodiode through the light transmission channel 21 to be received and converted into a photoelectric signal. The light transmission channel 21 effectively prevents the light beam 26 of the background object 7 from entering the light receiving surface of the photodiode. The distance between the light emitting chip 421 of the light emitting diode 42 and the last light emitting surface of the lens 3 is the total length of the emission optics. The total length of the emission optics in this embodiment is 7.29mm+ / -20%, which determines the optical transceiver device of the safety light curtain. The effective focal length of the lens 3 is f, and the aperture of the light transmission channel 21 near the opening 12 is D. The ratio (f / D) is 1.47544+ / -20%. Specifically, the optical transceiver of the safety light curtain can be a light curtain transmitting device or a light curtain receiving device, and the lens 3 and the bracket 2 of the light curtain transmitting device and the light curtain receiving device can be reused between the two, which effectively reduces the batch cost of manufacturing.

[0060] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0061] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety light curtain optical transceiver, characterized in that: include: A housing, wherein the housing is provided with a receiving cavity and an opening communicating with the receiving cavity; A bracket, the bracket is arranged in the accommodating cavity, the bracket is provided with a light-transmitting channel corresponding to the opening, and the aperture of the light-transmitting channel close to one end of the opening is D; A lens, wherein the lens is disposed on one end of the light-transmitting channel close to the opening, the focal length of the lens is f, and the range of f / D is 1.18-1.77; A light transceiver module is located at an end of the light-transmitting channel away from the opening.

2. The safety light curtain optical transceiver according to claim 1, characterized in that: The light-transmitting channel includes a cylindrical channel and a conical channel, one end of the cylindrical channel corresponds to the opening, the other end of the cylindrical channel is connected to the conical channel, and the radius of the conical channel gradually increases towards the opening.

3. The safety light curtain optical transceiver according to claim 2, characterized in that: The opening radius is the same as the cylindrical passage radius.

4. The safety light curtain optical transceiver according to claim 2, characterized in that: The lens aperture is the same as the cylindrical channel diameter.

5. The safety light curtain optical transceiver according to claim 1, characterized in that: The light transceiver module includes a transmitting circuit board and a light emitting diode arranged on the transmitting circuit board. The transmitting circuit board is arranged on the accommodating cavity, and the light emitting diode corresponds to the light-transmitting channel.

6. The safety light curtain optical transceiver according to claim 1, characterized in that: The light transceiver module includes a receiving circuit board and a photodiode arranged on the receiving circuit board. The receiving circuit board is arranged on the accommodating cavity, and the photodiode corresponds to the light-transmitting channel.

7. The safety light curtain optical transceiver according to claim 1, characterized in that: The lens is one of a biconvex lens, a plano-convex lens and a Fresnel lens.

8. The safety light curtain optical transceiver according to claim 1, characterized in that: The housing and the bracket are processed into an integrally formed component.

9. The safety light curtain optical transceiver according to claim 1, characterized in that: The lens is provided with a groove, and the bracket is provided with a protrusion matching the groove.

10. The safety light curtain optical transceiver according to claim 1, characterized in that: The opening is provided with a lens dust cover.

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