Rotary duplex optical communication device based on wide light beam coverage

Abstract

The invention relates to a rotary duplex optical communication device based on wide light beam coverage, which comprises a first transmission end and a second transmission end which are oppositely arranged, and the first transmission end and / or the second transmission end can rotate around a rotating shaft; the first transmission end comprises a first outer shell with the front end open, a first optical filter and a first printed board are sequentially arranged in the first outer shell in the front-back direction, and a first light source and a first detector are arranged on the first printed board. The second transmission end comprises a second outer shell with the front end open, a second optical filter and a second printed board are arranged in the second outer shell, and a second light source and a second detector are arranged on the front end face of the second printed board. The first light source and the second light source respectively have a first divergence angle and a second divergence angle, the first detector is covered by light beams of the second light source, and the second detector is covered by light beams of the first light source. The detector and the light source do not need to be coaxially aligned, so that the first transmission end and the second transmission end which rotate relatively do not need to be accurately aligned.

Description

Technical Field

[0001] This invention belongs to the field of wireless optical communication technology, specifically relating to a rotating duplex optical communication device based on wide beam coverage. Background Technology

[0002] In current optical communication technologies, bidirectional rotational communication often employs a BOSA (Bidirectional Optical Sub-Assembly) structure, achieving signal transmission and reception through coaxial parallel light transmission. This approach relies on precise optical alignment, and BOSA components are large with extremely small beam divergence angles (typically <5°), making it only suitable for static or long-distance scenarios. In short-distance rotational applications (such as industrial robot joints and smart home rotating devices), the parallel light must be strictly aligned; even slight misalignment can lead to communication interruption, making it unsuitable for dynamic misalignment during rotation. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a rotary full-duplex optical communication device based on wide beam coverage, enabling large-angle optical signal transmission between the light source and the detector through the coverage of a wide beam light source, thus solving the problem of strict alignment between the two rotating ends in existing optical transmission methods.

[0004] The objective of this invention and the technical problem it solves are achieved by the following technical solution. According to this invention, a rotary full-duplex optical communication device based on wide beam coverage includes a first transmission end 2 and a second transmission end 10 arranged opposite to each other. The first transmission end 2 and / or the second transmission end 10 are rotatable about a rotation axis 1. The first transmission end 2 includes a first outer shell 3 with an open front end. Inside the first outer shell 3, a first filter 7 and a first printed circuit board 4 are arranged sequentially along the front-back direction. A first light source 6 and a first detector 5 are arranged on the front end surface of the first printed circuit board 4. The second transmission end 10 includes a second outer shell 11 with an open front end. Inside the second outer shell 11, a first filter 7 and a first printed circuit board 4 are arranged sequentially along the front-back direction. The device includes a second filter 15 and a second printed circuit board 12. The front end face of the second printed circuit board 12 is provided with a second light source 14 and a second detector 13. The first light source 6 and the second light source 14 have a first divergence angle 18 and a second divergence angle 19, respectively. The angle between any position of the detection surface of the first detector 5 and the center of the second light source 14 and the rotation axis 1 is greater than or equal to zero and less than half of the second divergence angle 19. The angle between any position of the detection surface of the second detector 13 and the center of the first light source 6 and the rotation axis 1 is greater than or equal to zero and less than half of the first divergence angle 18.

[0005] The objectives of this invention and the technical problems it addresses can be further achieved by the following technical measures.

[0006] In the aforementioned rotary full-duplex optical communication device based on wide beam coverage, the first light source 6 and the second light source 14 are lasers with a divergence angle ≥20° or LEDs with a divergence angle ≥90°.

[0007] The aforementioned rotating duplex optical communication device based on wide beam coverage is characterized in that the wavelengths of the light emitted by the first light source 6 and the second light source 14 are different.

[0008] In the aforementioned rotary full-duplex optical communication device based on wide beam coverage, both the first filter 7 and the second filter 15 are narrow-bandpass filters.

[0009] In the aforementioned rotary full-duplex optical communication device based on wide beam coverage, the detection surface diameters of the first detector 5 and the second detector 13 are both not less than 0.5 mm.

[0010] In the aforementioned rotary full-duplex optical communication device based on wide beam coverage, optical isolation layers 8 are provided on the inner walls of both the first housing 3 and the second housing 11.

[0011] In the aforementioned rotary full-duplex optical communication device based on wide beam coverage, the optical isolation layer 8 is a microstructure light-absorbing coating.

[0012] The aforementioned rotary full-duplex optical communication device based on wide beam coverage further includes a first adaptive adjustment module and a second adaptive adjustment module. The first adaptive adjustment module includes a first sensor 20 fixed on the second printed circuit board and a first control unit 9 fixed on the first printed circuit board. The second adaptive adjustment module includes a second sensor 21 fixed on the first printed circuit board and a second control unit 16 fixed on the second printed circuit board. The first sensor 20 is covered by the beam of the second light source, and the second sensor 21 is always covered by the beam of the first light source 6. The first control unit 9 can adjust the power of the first light source 6 according to the light signal intensity fed back by the first sensor, and the second control unit 16 can adjust the power of the second light source according to the light signal intensity fed back by the second sensor.

[0013] In the aforementioned rotary full-duplex optical communication device based on wide beam coverage, the first light source 6 and the first detector 5, the second light source 14 and the second detector 13 are all distributed on both sides of the axis of the rotation axis 1.

[0014] In the aforementioned rotary full-duplex optical communication device based on wide beam coverage, the center of the rotating shaft 1 has a through hole 17 extending axially. The first transmission end 2 and the second transmission end 10 are located at the two ends of the through hole 17, and the inner diameter of the through hole 17 is larger than the outer circumference of the first outer shell 3 and the second outer shell 11. When both the first transmission end 2 and the second transmission end 10 are located in the through hole 17, the first detector is always covered by the beam of the second light source, and the second detector is always covered by the beam of the first light source.

[0015] In the aforementioned rotating duplex optical communication device based on wide beam coverage, the first divergence angle 18 and the second divergence angle 19 can be adjusted by a lens.

[0016] In the aforementioned rotary full-duplex optical communication device based on wide beam coverage, the first transmission end 2 and / or the second transmission end 10 can be offset radially along the rotation axis 1 within a set range. During the offset process, it is only necessary to keep the first detector always covered by the beam of the second light source and the second detector always covered by the beam of the first light source.

[0017] Compared with existing technologies, this invention has significant advantages and beneficial effects. Through the above technical solution, this invention achieves considerable technological advancement and practicality, and has broad industrial application value, possessing at least the following advantages:

[0018] The first and second transmission ends of this invention emit light beams through a wide-angle light source, so that the detector corresponding to the light source does not need to be coaxially aligned with the light source, but only needs to be within the coverage area of ​​the light source beam. Thus, the relatively rotating first and second transmission ends do not need to be precisely aligned, which reduces the requirements for installation and processing accuracy. At the same time, the first and second transmission ends can also be offset relative to each other radially along the rotation axis within a set range, as long as the detector is within the coverage area of ​​the corresponding light source beam during the offset process.

[0019] The light source of this invention can be LED, which breaks through the limitation of existing technologies that only use lasers as the light source.

[0020] This invention effectively avoids the influence of reflected light on the light source by using a filter, an optical isolation layer, and different wavelengths of the light sources at the two transmission ends.

[0021] The present invention has an adaptive adjustment module at both transmission ends to avoid detector power saturation or insufficient power problems.

[0022] Finally, the present invention also features a simple structure and small size. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the rotating full-duplex optical communication device based on wide beam coverage according to the present invention.

[0024] [Explanation of Key Component Symbols]

[0025] 1: Rotation axis

[0026] 2: First transmission end

[0027] 3: First outer shell

[0028] 4: First Printed Circuit Board

[0029] 5: First detector

[0030] 6: First light source

[0031] 7: First filter

[0032] 8: Optical isolation layer

[0033] 9: First Control Unit

[0034] 10: Second transmission end

[0035] 11: Second outer shell

[0036] 12: Second Printed Circuit Board

[0037] 13: Second detector

[0038] 14: Second Light Source

[0039] 15: Second filter

[0040] 16: Second Control Unit

[0041] 17: Through hole

[0042] 18: First divergence angle

[0043] 19: Second divergence angle

[0044] 20: First Sensor

[0045] 21: Second sensor Detailed Implementation

[0046] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of the rotary full-duplex optical communication device based on wide beam coverage proposed in accordance with the present invention.

[0047] Please see Figure 1This is a schematic diagram of the structure of the rotary full-duplex optical communication device based on wide beam coverage according to the present invention. The communication device includes a first transmission end 2 and a second transmission end 10 arranged opposite to each other, and both the first transmission end 2 and the second transmission end 10 can rotate around a rotation axis 1 to transmit and receive signals. The first transmission end 2 includes a first outer shell 3 with an open front end. A first printed circuit board 4 is provided at the rear end of the cavity of the first outer shell 3, and a first filter 7 is provided at the front end. A first light source 6 and a first detector 5 are respectively provided on the front end surface of the first printed circuit board 4. The second transmission end 10 includes a second outer shell 11 with an open front end. A second filter 15 and a second printed circuit board 12 are arranged sequentially along the front-rear direction in the cavity of the second outer shell 11. A second detector 13 and a second light source 14 are provided on the front end surface of the second printed circuit board 12. The first filter 7 is used to filter the incident light, allowing only light in the wavelength range emitted by the second light source 14 to enter, thereby enabling the first detector 5 to receive only the light emitted by the second light source 14; the second filter 15 also filters the incident light, allowing only light in the wavelength range emitted by the first light source 6 to enter, thereby enabling the second detector 13 to receive only the light emitted by the first light source 6, in order to suppress interference from ambient light and reflections.

[0048] The first light source 6 and the second light source 14 have a first divergence angle 18 and a second divergence angle 19, respectively. When the first transmission end 2 and the second transmission end 10 rotate around the rotation axis 1 to any position, the angle between any position of the detection surface of the first detector 5 and the center of the second light source 14 and the rotation axis 1 is greater than or equal to zero and less than half of the second divergence angle 19. The angle between any position of the detection surface of the second detector 13 and the center of the first light source 6 and the rotation axis 1 is greater than or equal to zero and less than half of the first divergence angle 18. Thus, within the rotation stroke of the first transmission end 2 and the second transmission end 10, the detection surface of the first detector 5 is always covered by the light signal coverage of the second light source 14 with the second divergence angle 19, and the detection surface of the second detector 13 is always covered by the light signal emitted by the first light source 6 with the first divergence angle 18. This allows the first detector 5 and the second light source 14, and the second detector 13 and the first light source 6, to be aligned without needing to be directly opposite each other, while still satisfying wireless optical transmission during coaxial rotation.

[0049] The first light source 6 and the second light source 14 can be the same or different light sources. In this invention, the first light source 6 and the second light source 14 can be lasers or LEDs with a large divergence angle. For example, the first light source 6 and the second light source 14 can simultaneously be lasers with a divergence angle ≥20° or LEDs with a divergence angle ≥90°. Alternatively, one light source can be a laser with a divergence angle ≥20°, and the other a LED with a divergence angle ≥90°. Other light sources with sufficiently large divergence angles can also be selected. The selection of the divergence angle of the light source in this invention can be determined based on the maximum angle between the line connecting the centers of the two transmission end light sources and the detector during rotation and the rotation axis. A light source with a divergence angle greater than twice the aforementioned maximum angle can be selected, or a lens can be added to the front end of the light source to adjust the divergence angle of the emitted light to an angle greater than the aforementioned maximum angle, so as to meet the requirement that the emitted light can always cover the corresponding detector.

[0050] The first light source 6 emits light with a wavelength of λ, and the second light source 14 emits light with a wavelength of λ. λ and λ can be the same or different. In this embodiment, λ and λ are different, where λ is 850nm and λ is 1310nm. However, in other embodiments of the present invention, λ and λ can be selected from other wavelength values. The use of wide divergence angle light sources with different wavelengths at the two transmission ends in this embodiment of the present invention, in conjunction with filters, can further enhance anti-interference capabilities.

[0051] In this embodiment of the invention, the first filter 7 and the second filter 15 are both narrow-bandpass filters. Preferably, the bandwidth of the first filter 7 and the second filter 15 is ±5nm. In this embodiment, the channel through which λ passes through the first filter 7 transmits only 1310nm±3nm light, and the channel through which λ passes through the second filter 15 transmits only 850±3nm light.

[0052] In this embodiment of the invention, the wavelengths of the light emitted by the first light source 6 and the second light source 14 are different, the wavelengths of the light allowed to pass through the first filter 7 and the second filter 15 are also different, and the wavelengths of the light that the first detector and the second detector can receive are also different. Therefore, the communication device of the present invention can effectively avoid interference from ambient light and emission.

[0053] In this embodiment of the invention, in order to improve the reception efficiency of optical signals, both the first detector and the second detector are large-area, high-sensitivity detectors. Preferably, the diameters of the first detector and the second detector are ≥0.5mm.

[0054] To further reduce reflections during communication, optical isolation layers 8 are provided on the inner walls of both the first housing 3 and the second housing 11. These optical isolation layers 8 absorb light received by the inner walls of the first housing 3 or the second housing 11 to prevent light reflection at those locations. Preferably, the optical isolation layer 8 is a microstructure light-absorbing coating, but it is not limited to this.

[0055] In this embodiment of the invention, the first light source 6 and the first detector 5 are distributed on both sides of the axis of rotation 1, and the second light source 14 and the second detector 13 are also distributed on both sides of the axis of rotation 1. Preferably, the distance between the first light source 6 and the first detector 5 is the same as the distance between the second light source 14 and the second detector 13, but this is not a limitation. However, in other embodiments of the invention, within the same transmission end, one of the light source and the detector is distributed on the axis of rotation 1.

[0056] In this embodiment of the invention, the communication device further includes a first adaptive adjustment module and a second adaptive adjustment module. The first adaptive adjustment module includes a first sensor 20 and a first control unit 9, and the second adaptive adjustment module includes a second sensor 21 and a second control unit 16. The first sensor 20 is fixedly mounted on the second printed circuit board 12 and is always within the optical path coverage of the first light source 6. It is used to detect the intensity of the light signal received by the second transmission end and transmit it to the first control unit 9. The first control unit 9 is fixedly mounted on the first printed circuit board 4 and can linearly adjust the power of the first light source 6 according to the feedback signal from the first sensor 20 to prevent the light power received by the second detector from becoming saturated or insufficient. The second sensor 21 is fixedly mounted on the first printed circuit board 4 and is located within the optical path coverage of the second light source 14. It is used to detect the intensity of the light signal received by the first transmission end and feed the detection signal back to the second control unit 16. The second control unit 16 is fixedly mounted on the second printed circuit board 12 and can linearly adjust the power of the second light source 14 according to the feedback signal from the second sensor 21 to prevent the light signal received by the first detector 7 from becoming too strong or too weak. For example, when the light signal received by the detector is too strong, the power of the light source can be reduced by 50% by the control unit.

[0057] In this embodiment of the invention, the rotating shaft 1 has a through hole 17 extending through both ends of its axial direction. The first transmission end 2 and the second transmission end 10 are fixed relative to each other at both ends of the through hole 17, and the light paths of their respective light sources are transmitted axially along the through hole 17. The through hole 17 not only provides an unobstructed transmission path for the light transmission of the two transmission ends, but also serves to maintain the coarse alignment of the first transmission end 2 and the second transmission end 10. Specifically, the size of the through hole 17 is slightly larger than the outer circumference of the first outer shell 3 and the second outer shell 11, allowing the first outer shell 3 and the second outer shell 11 to be positioned at both ends of the through hole 17 and to float within the through hole 17. This ensures the coarse positioning of the first transmission end 2 and the second transmission end 10. Since both the first and second light sources have large divergence angles, the detectors of the first and second transmission ends are always within the light path coverage range of their respective light sources, regardless of their positions within the through hole 17. In other words, the light source and corresponding detector of the first transmission end 2 and the second transmission end 10 of this invention do not need to be coaxially aligned. They only need to be fixed in the through hole 17 to meet the requirement that the light beam covers the detector during relative rotation, thereby achieving reliable signal transmission. This invention can also perform coarse alignment of the first transmission end and the second transmission end by visual inspection or other mechanical means.

[0058] The rotation of the first transmission end 2 and the second transmission end 10 around the rotation axis 1 can occur in the following ways: 1) The first transmission end 2 and the second transmission end 10 rotate synchronously in the same direction; 2) One of the first transmission end 2 and the second transmission end 10 is fixed, while the other rotates around the rotation axis 1; 3) The first transmission end 2 and the second transmission end 10 rotate in the same direction at different speeds; 4) The first transmission end 2 and the second transmission end 10 rotate in different directions. Regardless of how the first transmission end 2 and the second transmission end 10 rotate around the rotation axis 1, the first detector is always covered by the beam of the second light source, and the second detector is always covered by the beam of the first light source.

[0059] The first transmission end 2 and the second transmission end 10 of the present invention can be respectively set on two devices or platforms rotating around the same rotation axis, and rely on wide beam coverage to achieve coarse alignment rather than precise alignment.

[0060] At least one of the first transmission end 2 and the second transmission end 10 of the present invention can also be offset radially along the rotation axis 1, provided that the first detector is always covered by the beam of the second light source and the second detector is covered by the beam of the first light source during the offset. In this embodiment, at least one of the first transmission end 2 and the second transmission end 10 can be offset radially within the through hole 17.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A rotating full-duplex optical communication device based on wide beam coverage, characterized in that: It includes a first transmission end and a second transmission end that are positioned opposite to each other, and the first transmission end and / or the second transmission end are rotatable about a rotation axis; The first transmission end includes a first outer shell with an open front end. A first filter and a first printed circuit board are arranged sequentially in the front-rear direction inside the first outer shell. A first light source and a first detector are arranged on the front surface of the first printed circuit board. The second transmission end includes a second outer shell with an open front end. A second filter and a second printed circuit board are arranged sequentially in the front-rear direction inside the second outer shell. A second light source and a second detector are arranged on the front surface of the second printed circuit board. The first light source and the second light source have a first divergence angle and a second divergence angle, respectively. The angle between the line connecting any position of the detection surface of the first detector and the center of the second light source and the rotation axis is greater than or equal to zero and less than half of the second divergence angle. The angle between the line connecting any position of the detection surface of the second detector and the center of the first light source and the rotation axis is greater than or equal to zero and less than half of the first divergence angle.

2. The rotating duplex optical communication device based on wide beam coverage according to claim 1, characterized in that: The first light source and the second light source are lasers or...

3. The rotating duplex optical communication device based on wide beam coverage according to claim 1, characterized in that: The first light source and the second light source emit light at different wavelengths.

4. The rotating duplex optical communication device based on wide beam coverage according to any one of claims 3, characterized in that: Both the first filter and the second filter are narrow bandpass filters.

5. The rotating duplex optical communication device based on wide beam coverage according to any one of claims 1-4, characterized in that: The detection surface diameters of both the first and second detectors are not less than 0.5 mm.

6. The rotating duplex optical communication device based on wide beam coverage according to any one of claims 1-4, characterized in that: Optical isolation layers are provided on the inner walls of both the first and second housings.

7. The rotating duplex optical communication device based on wide beam coverage according to claim 6, characterized in that: The optical isolation layer is a microstructure light-absorbing coating.

8. The rotating duplex optical communication device based on wide beam coverage according to any one of claims 1-4 and 7, characterized in that: It also includes a first adaptive adjustment module and a second adaptive adjustment module. The first adaptive adjustment module includes a first sensor fixed on the second printed circuit board and a first control unit fixed on the first printed circuit board. The second adaptive adjustment module includes a second sensor fixed on the first printed circuit board and a second control unit fixed on the second printed circuit board. The first sensor is covered by the light beam of the second light source, and the second sensor is always covered by the light beam of the first light source. The first control unit can adjust the power of the first light source according to the light signal intensity fed back by the first sensor, and the second control unit can adjust the power of the second light source according to the light signal intensity fed back by the second sensor.

9. The rotating duplex optical communication device based on wide beam coverage according to claim 8, characterized in that: The first light source and the first detector, as well as the second light source and the second detector, are respectively distributed on both sides of the axis of rotation.

10. The rotating duplex optical communication device based on wide beam coverage according to claim 8, characterized in that: The rotating shaft has a through hole extending axially at its center. The first transmission end and the second transmission end are located at the two ends of the through hole, respectively. The inner diameter of the through hole is larger than the outer periphery of the first housing and the second housing. When both the first transmission end and the second transmission end are located inside the through hole, the first detector is always covered by the beam of the second light source, and the second detector is always covered by the beam of the first light source.

11. The rotating duplex optical communication device based on wide beam coverage according to any one of claims 1-4 and 9-10, characterized in that: The first divergence angle and the second divergence angle can be adjusted by the lens.

12. The rotary full-duplex optical communication device based on wide beam coverage according to any one of claims 1-4 and 9-10, characterized in that: The first transmission end and / or the second transmission end can be offset radially along the rotation axis within a set range. During the offset process, it is only necessary to keep the first detector always covered by the beam of the second light source and the second detector always covered by the beam of the first light source.

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