CN111913163A - Optical signal transmitter and laser radar - Google Patents
Optical signal transmitter and laser radar Download PDFInfo
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- CN111913163A CN111913163A CN201910374805.5A CN201910374805A CN111913163A CN 111913163 A CN111913163 A CN 111913163A CN 201910374805 A CN201910374805 A CN 201910374805A CN 111913163 A CN111913163 A CN 111913163A
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- light
- optical signal
- carrier
- waveguide
- annular waveguide
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
Abstract
The application discloses optical signal transmitter and laser radar, this optical signal transmitter is used for the data transmission between first carrier and the second carrier of relative motion, includes: a light emitting element, a light receiving element, and an optical waveguide. The light emitting element is arranged on the first carrier, the light receiving element is arranged on the second carrier, and the optical waveguide is arranged between the light emitting element and the light receiving element. The optical signal emitted by the light emitting element is incident on the optical waveguide and is output after being transmitted by the optical waveguide, and the optical signal output by the optical waveguide is received by the light receiving element and is converted into an electric signal to be output. The optical waveguide transmission device has the advantages that the specially designed optical waveguide is adopted to transmit the data signals between the two components which move relatively, complete wireless optical signal transmission is realized, the performance is stable, the bandwidth is high, and no electromagnetic interference exists on other circuits.
Description
Technical Field
The application relates to the field of signal transmission, in particular to an optical signal transmitter and a laser radar.
Background
In mechanically moving structures, data transmission between two parts moving relative to each other is often required. For example, wireless signal transmission is generally adopted for data transmission on a rotating structure, and currently, two methods are generally adopted for data transmission between two components which rotate relative to each other: 1. signals are transmitted by utilizing the electromagnetic induction of the two groups of non-contact coils, the transmission data bandwidth is low, and electromagnetic signals easily interfere other circuits. 2. The optical signal transmitting and receiving equipment is arranged in the center of the rotating shaft, the transmission data bandwidth is high, other circuits are not interfered, the structural strength of the rotating shaft with the hollow center is low, and the shock resistance of the device is reduced.
Disclosure of Invention
The application aims to provide an optical signal transmitter which has the advantages of high bandwidth, no electromagnetic interference to other circuits, no influence on structural stability and the like and is suitable for data transmission between two parts which move relatively.
In order to achieve one of the above objects, the present application provides an optical signal transmitter for data transmission between a first carrier and a second carrier that are relatively movable, the optical signal transmitter comprising:
a light emitting element disposed on the first carrier;
a light receiving element provided on the second carrier;
an optical waveguide provided between the light emitting element and the light receiving element;
the optical signal emitted by the light emitting element is incident on the optical waveguide and is output after being transmitted by the optical waveguide, and the light receiving element receives the optical signal output by the optical waveguide and converts the optical signal into an electric signal to be output.
As a further improvement of the embodiment, the first carrier is fixed on a rotating shaft, and the rotating shaft drives the first carrier to rotate relative to the second carrier; or the second carrier is fixed on a rotating shaft, and the rotating shaft drives the second carrier to rotate relative to the first carrier;
the optical waveguide is a ring waveguide which is sleeved on the rotating shaft or the extension line of the rotating shaft.
As a further improvement of the embodiment, the annular waveguide includes at least one light-passing port and a light-passing surface for inputting or outputting the optical signal, respectively.
As a further improvement of the embodiment, the light admission port includes a reflection slope for reflecting the light signal into the annular waveguide or guiding the light signal out of the annular waveguide.
As a further improvement of the embodiment, other surfaces of the annular waveguide other than the light transmission port and the light transmission surface are made to be diffuse reflection surfaces; alternatively, a surface of the annular waveguide facing the light-transmitting surface is a diffuse reflection surface, and the surface facing the light-transmitting surface, and other surfaces of the annular waveguide other than the light-transmitting port are smooth surfaces or specular reflection surfaces.
As a further refinement of an embodiment, the annular waveguide is fixed on the first carrier;
the light transmitting port is a light input port, and the light transmitting surface is a light emergent surface; the light emitting element is adjacent to the light input port; the light exit surface includes a surface of the annular waveguide facing the light receiving element;
and the optical signal emitted by the light emitting element is incident into the annular waveguide through the light input port and is output through the light output surface.
As a further refinement of an embodiment, the light input port is provided on a rear face of the annular waveguide opposite the light exit face, the light emitting element being located between the light input port and the first carrier.
As a further improvement of the embodiment, the light input port is provided on an inner side surface or an outer side surface of the annular waveguide connected to the light output surface, and the light emitting element is located inside or outside a ring of the annular waveguide.
As a further refinement of an embodiment, the annular waveguide is fixed on the second carrier;
the light-passing port is a light output port, and the light-passing surface is a light incident surface; the light receiving element is adjacent to the light output port; the light incident surface includes a surface of the annular waveguide facing the light receiving element; the light signal emitted by the light emitting element is incident into the annular waveguide through the light incident surface and is output through the light output port.
As a further improvement of the embodiment, the light output port is provided on a back surface of the annular waveguide opposite to the light incident surface, and the light receiving element is located between the light output port and the second carrier.
As a further improvement of the embodiment, the light output port is provided on an inner side surface or an outer side surface of the annular waveguide connected to the light incident surface, and the light receiving element is located inside or outside a ring of the annular waveguide.
The application also provides a laser radar comprising the optical signal transmitter according to any one of the above embodiments.
The beneficial effect of this application: the special optical waveguide is adopted to transmit the data signal between the two components which move relatively, so that complete wireless optical signal transmission is realized, the performance is stable, the bandwidth is high, and no electromagnetic interference exists on other circuits.
Drawings
FIG. 1 is a schematic diagram of a laser radar of the present application;
FIG. 2 is an exploded view of the lidar of the present application;
FIG. 3 is an exploded view of an optical signal transmitter according to the present application;
fig. 4 is a schematic diagram of an optical transmitting terminal in embodiment 1 of the optical signal transmitter of the present application;
FIG. 5 is a schematic view of a ring waveguide structure in embodiment 1 of the present application;
FIG. 6 is a bottom view of another modified structure of the annular waveguide in embodiment 1 of the present application;
FIG. 7 is a bottom view of a ring waveguide according to still another modification of embodiment 1 of the present application;
fig. 8 is a schematic structural diagram of an optical signal transmitter embodiment 2 of the present application.
Detailed Description
The present application will now be described in detail with reference to specific embodiments thereof as illustrated in the accompanying drawings. These embodiments are not intended to limit the present application, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present application.
In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.
Also, terms used herein such as "upper," "above," "lower," "below," and the like, denote relative spatial positions of one element or feature with respect to another element or feature as illustrated in the figures for ease of description. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. When an element or layer is referred to as being "on," or "connected" to another element or layer, it can be directly on, connected to, or intervening elements or layers may be present.
In the laser radar, as shown in fig. 1, the detection part 10 and the control part 20 are often in relative motion, and data transmission between the detection part 10 and the control part 20 is a key factor affecting the overall performance and service life of the laser radar. The optical signal transmitter provided by the application can be used for data transmission between the detection part 10 and the control part 20 in the laser radar, namely, the optical signal transmitter is used for data transmission between the first carrier and the second carrier which can move relatively, a specially designed optical waveguide is adopted, no transmission lead or optical fiber is needed, a hollow rotating shaft is also not needed, the strength of the whole structure is strong, the performance is stable, the bandwidth is high, and no electromagnetic interference exists on other circuits.
Specifically, the optical signal transmitter includes: a light emitting element, a light receiving element, and an optical waveguide. The light emitting element is arranged on the first carrier, the light receiving element is arranged on the second carrier, and the optical waveguide is arranged between the light emitting element and the light receiving element. The optical signal emitted by the light emitting element is incident on the optical waveguide and is output after being transmitted by the optical waveguide, and the optical signal output by the optical waveguide is received by the light receiving element and is converted into an electric signal to be output.
Example 1
The embodiment is explained by taking data transmission between the detection part and the control part in the laser radar as an example, as shown in fig. 1 and 2, the control part 20 of the laser radar is generally fixedly installed on a using device, such as a vehicle, the detection part 10 is connected with the control part 20 through a rotating shaft 30, and the rotating shaft 30 drives the detection part 10 to rotate relative to the control part 20. Two circuit boards 12 and 22 are mounted on the rotary shaft 30, one of which is fixed to the base 21 of the control unit 20 and the other of which is fixed to the rotor 11 of the detection unit 10. The two circuit boards 12, 22 may be the above-described first carrier and second carrier, respectively, that is, the light emitting element 13 and the light receiving element 23 are mounted on the above-described two circuit boards 12, 22, respectively. When it is necessary to transmit data from the detecting section 10 to the control section 20, the light emitting element 13 is mounted on the circuit board 12 at one end of the detecting section 10, and the light receiving element 23 is mounted on the circuit board 22 at one end of the control section 20, i.e., the first carrier is fixed to a rotating shaft (or rotor) which rotates the first carrier relative to the second carrier. When it is necessary to send data from the control section 20 to the detection section 10, the light emitting element 13 is mounted on the circuit board 22 at one end of the control section 20, and the light receiving element 23 is mounted on the circuit board 12 at one end of the detection section 10, i.e., the second carrier is fixed to a rotating shaft (or base) that rotates the second carrier relative to the first carrier. Wherein, the first carrier and the second carrier can be the rotor or the base respectively. In this embodiment, the optical waveguide is a ring waveguide 14, and the ring waveguide 14 is sleeved on the rotating shaft 30. The annular waveguide is used for optical signal transmission, a hollow rotating shaft is not needed, a solid rotating shaft can be used, and the strength of the whole structure is effectively improved; and the optical signal is adopted for data transmission, so that the performance is stable, the bandwidth is high, and no electromagnetic interference exists on other circuits.
Specifically, the annular waveguide includes at least one light-passing port and one light-passing surface, which are respectively used for inputting or outputting optical signals. In this embodiment, the light-passing port includes a reflection slope for reflecting the light signal into the ring waveguide or reflecting the light signal out of the ring waveguide, so as to improve the efficiency of receiving or outputting the light signal by the ring waveguide. In addition, the other inner surfaces of the annular waveguide except the light-passing port and the light-passing surface are made to be diffuse reflection surfaces, or the surface of the annular waveguide opposite to the light-passing surface is made to be diffuse reflection surfaces, and the surface opposite to the light-passing surface, the light-passing surface and the other surfaces of the annular waveguide except the light-passing port are made to be smooth surfaces or mirror reflection surfaces, so that the optical signals in the annular waveguide are distributed uniformly, and the optical receiving elements can obtain consistent optical signal intensity at each rotation angle in the rotation process of the rotating shaft.
As shown in fig. 4, in this embodiment, the ring waveguide 14 is fixed on the first carrier (i.e., the circuit board 12), the light-passing port is a light input port 141, the light-passing surface is a light output surface 142, the light emitting element 13 is adjacent to the light input port 141, the light output surface 142 includes a surface of the ring waveguide 14 facing the light receiving element 23, and the optical signal emitted by the light emitting element 13 is incident into the ring waveguide 14 through the light input port 141 and is output through the light output surface 142.
As shown in fig. 4 and 5, in this embodiment, the waveguide cross section a of the annular waveguide 14 is a quadrangle, that is, the annular waveguide 14 includes a bottom surface a, a top surface b, and an outer side surface c and an inner side surface d connecting the bottom surface a and the top surface b, where the outer side surface c refers to the side surface on the outer side of the ring of the annular waveguide 14, the inner side surface d refers to the side surface on the inner side of the ring, and the top surface b and the bottom surface a represent the spatial relative position relationship of the two surfaces. Wherein the bottom surface a is a light output surface 142 facing the light receiving element, the light input port 141 is provided on the top surface b (i.e. on the back surface opposite to the light exit surface 142), and the light emitting element 13 is located between the ring waveguide 14 and the first carrier, i.e. the light emitting element 13 is located above the ring waveguide 14. Wherein the annular waveguide 14 is fixed to the first carrier (circuit board 12) by a transition ring 15, and the transition ring 15 is provided with an escape opening at a position opposite to the light input port 141 for accommodating the light emitting element 13. Here, the optical input port 141 may be a window on the top surface b for receiving the optical signal, or a reflecting slope 143 may be formed in the optical input port 141 to reflect the optical signal into the ring waveguide 14, so as to improve the receiving efficiency of the ring waveguide 14 for the input optical signal. In this embodiment, the outer side surface c, the inner side surface d, and the other portion of the top surface b except the light input port 141 of the ring waveguide 14 are made into diffuse reflection surfaces, such as rough surfaces, to perform diffuse reflection on the light signal input into the ring waveguide 14, so that the light signal distribution in the ring waveguide 14 is relatively uniform, and the intensity difference of the light signal output from each position of the light output surface 142 of the ring waveguide 14 is relatively small, so that the light receiving element can obtain relatively uniform light signal intensity at each rotation angle during the rotation of the rotation shaft. Alternatively, the optical signal input into the ring waveguide 14 may be diffusely reflected by making the outer surface c and the inner surface d of the ring waveguide 14 smooth or specular surfaces and making the other portion of the top surface b except the light input port 141 diffuse.
As shown in fig. 6 and 7, in other embodiments, the light input port 141 of the annular waveguide 14 may also be provided on the outer side surface c. For example, as shown in fig. 6, a reflection slope is formed at the light input port 141 on the outer side surface c to reflect the light signal into the ring waveguide 14. Alternatively, as shown in fig. 7, a waveguide tangent to the annular waveguide 14 is formed on the outer side surface c of the annular waveguide 14 as a light input port 141, and the waveguide serving as the light input port may have other shapes or have other connection angles with the outer side surface of the annular waveguide 14. In this structure, the light emitting element 13 is located outside the ring of the annular waveguide 14, and is adjacent to the light input port 141, the light signal emitted by the light emitting element 13 is input into the annular waveguide 14 through the light input port 141, is transmitted to each direction of the annular waveguide 14 through reflection of the top surface, the outer side surface c and the inner side surface d, and is output from the bottom surface a of the annular waveguide 14, i.e., the light output surface 142, and the light receiving element receives a part of the signal light output from the light output surface and converts the signal light into an electrical signal for output. In the structure, the annular waveguide is directly fixed on the first carrier, a transition ring is not needed, and the structure is simpler.
Similarly, the light input port may be provided on the inner side of the annular waveguide and correspondingly the light emitting element is located inside the annulus of the annular waveguide, adjacent the light input port.
Of course, in other embodiments, the waveguide cross section of the annular waveguide may also be circular, elliptical, or other polygonal shapes, and the ring shape of the annular waveguide is a circular ring shape, and the center of the circular ring shape is located on the axis of the rotating shaft.
Example 2
As shown in fig. 8, this embodiment is different from embodiment 1 in that an annular waveguide 24 is fixed to a second carrier (i.e., a circuit board 22), the light-passing port is a light-outputting port, the light-passing surface is a light-entering surface, a light-receiving element 23 is adjacent to the light-outputting port, and the light-entering surface includes a surface of the annular waveguide 24 facing a light-emitting element 13. In which the annular waveguide 24 is fixed to the second carrier (circuit board 22) by a transition ring 25, and the transition ring 25 is provided with an escape opening at a position opposite to the light output port for accommodating the light receiving element 23. The optical signal emitted from the light emitting element 13 is incident into the annular waveguide 24 through the light incident surface, is output through the light output port, is received by the light receiving element 23, and is converted into an electrical signal to be output.
Similarly to embodiment 1, the above-described light output port may be provided on a back surface of the annular waveguide opposite to the light incident surface, and accordingly, the light receiving element is located between the light output port and the second carrier, that is, the light receiving element is provided on an upper surface of the annular waveguide. Of course, in other embodiments, the light output port may be disposed on the inner side or the outer side of the annular waveguide connected to the light incident surface, and correspondingly, the light receiving element is disposed on the inner side or the outer side of the ring of the annular waveguide.
Here, the optical output port may be a window on the ring waveguide for outputting the optical signal, or a reflection slope may be formed in the optical output port to reflect and output the optical signal transmitted in the ring waveguide, so as to improve the intensity of the optical signal output by the ring waveguide. The annular waveguide can be made into a diffuse reflection surface except the light output port and the light incident surface, for example, a rough surface is made, and the light signals input into the annular waveguide are subjected to diffuse reflection, so that the light signals in the annular waveguide are respectively uniform, and the light signals can be transmitted to the light output port no matter which position of the light incident surface the light signals enter in the rotating process of the rotating shaft at each rotating angle, and the light receiving element can obtain more consistent light signal intensity.
Similarly, the waveguide cross section of the annular waveguide may be circular, elliptical, polygonal, or the like, and the ring of the annular waveguide is a circular ring whose center is located on the axis of the rotating shaft.
The above embodiments are illustrated by taking a laser radar as an example, a light emitting element is mounted on a circuit board at one end of a rotatable detection part, and a light receiving element is mounted on a circuit board at one end of a relatively stationary control part, so that detection information is converted into a light signal to be transmitted to the light receiving element of the control part, and the light signal is received by the light receiving element and converted into an electric signal to be transmitted to the control part. Of course, when it is necessary to transmit the command of the control portion to the detection portion, the light emitting element may be mounted on a circuit board at one end of the control portion which is relatively stationary, so as to convert the control command into an optical signal to be transmitted to the light receiving element of the detection portion, and then the optical signal is received by the light receiving element and converted into an electrical signal to be transmitted to the detection portion. Here, the light emitting element generally employs a light emitting device having a large divergence angle, such as a Light Emitting Diode (LED) or the like, and the light receiving element generally employs a photodetector having a large photosurface or a photodetector having a large light receiving angle.
Of course, the above description is only given by taking the application of the optical signal transmitter in the laser radar as an example, and the optical signal transmitter may also be applied to data transmission between two components which move relatively.
The above list of details is only for the concrete description of the feasible embodiments of the present application, they are not intended to limit the scope of the present application, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present application are intended to be included within the scope of the present application.
Claims (12)
1. An optical signal transmitter for data transmission between a first carrier and a second carrier that are relatively movable, the optical signal transmitter comprising:
a light emitting element disposed on the first carrier;
a light receiving element provided on the second carrier;
an optical waveguide provided between the light emitting element and the light receiving element;
the optical signal emitted by the light emitting element is incident on the optical waveguide and is output after being transmitted by the optical waveguide, and the light receiving element receives the optical signal output by the optical waveguide and converts the optical signal into an electric signal to be output.
2. The optical signal transmitter of claim 1, wherein:
the first carrier is fixed on a rotating shaft, and the rotating shaft drives the first carrier to rotate relative to the second carrier; or the second carrier is fixed on a rotating shaft, and the rotating shaft drives the second carrier to rotate relative to the first carrier;
the optical waveguide is a ring waveguide which is sleeved on the rotating shaft or the extension line of the rotating shaft.
3. The optical signal transmitter of claim 2, wherein:
the annular waveguide comprises at least one light through port and a light through surface which are used for inputting or outputting optical signals respectively.
4. The optical signal transmitter of claim 3, wherein:
the light-transmitting port comprises a reflection inclined plane, and light signals are reflected and input into the annular waveguide or guided out of the annular waveguide.
5. The optical signal transmitter of claim 3, wherein: the other surfaces of the annular waveguide outside the light transmitting port and the light transmitting surface are provided with diffuse reflection surfaces; alternatively, a surface of the annular waveguide facing the light-transmitting surface is a diffuse reflection surface, and the surface facing the light-transmitting surface, and other surfaces of the annular waveguide other than the light-transmitting port are smooth surfaces or specular reflection surfaces.
6. The optical signal transmitter according to any one of claims 3 to 5, wherein:
the annular waveguide is fixed on the first carrier;
the light transmitting port is a light input port, and the light transmitting surface is a light emergent surface; the light emitting element is adjacent to the light input port; the light exit surface includes a surface of the annular waveguide facing the light receiving element;
and the optical signal emitted by the light emitting element is incident into the annular waveguide through the light input port and is output through the light output surface.
7. The optical signal transmitter of claim 6, wherein: the light input port is arranged on the back surface of the annular waveguide opposite to the light emergent surface, and the light emitting element is positioned between the light input port and the first carrier.
8. The optical signal transmitter of claim 6, wherein: the light input port is arranged on the annular waveguide and connected with the inner side surface or the outer side surface of the light emergent surface, and the light emitting element is positioned on the ring inner side or the ring outer side of the annular waveguide.
9. The optical signal transmitter according to any one of claims 3 to 5, wherein:
the annular waveguide is fixed on the second carrier;
the light-passing port is a light output port, and the light-passing surface is a light incident surface; the light receiving element is adjacent to the light output port; the light incident surface includes a surface of the annular waveguide facing the light receiving element; the light signal emitted by the light emitting element is incident into the annular waveguide through the light incident surface and is output through the light output port.
10. The optical signal transmitter of claim 9, wherein: the light output port is arranged on the back face, opposite to the light incident face, of the annular waveguide, and the light receiving element is located between the light output port and the second carrier.
11. The optical signal transmitter of claim 9, wherein: the light output port is arranged on the annular waveguide and connected with the inner side surface or the outer side surface of the light incident surface, and the light receiving element is positioned on the ring inner side or the ring outer side of the annular waveguide.
12. A lidar, characterized by: comprising an optical signal transmitter according to any of claims 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910374805.5A CN111913163A (en) | 2019-05-07 | 2019-05-07 | Optical signal transmitter and laser radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910374805.5A CN111913163A (en) | 2019-05-07 | 2019-05-07 | Optical signal transmitter and laser radar |
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| Publication Number | Publication Date |
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| CN111913163A true CN111913163A (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910374805.5A Withdrawn CN111913163A (en) | 2019-05-07 | 2019-05-07 | Optical signal transmitter and laser radar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220187542A1 (en) * | 2020-04-29 | 2022-06-16 | Northrop Grumman Systems Corporation | Hollow shaft optical rotary joint |
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| WO2004015463A1 (en) * | 2002-08-09 | 2004-02-19 | Acreo Ab | Mirrors for polymer waveguides |
| US20090154936A1 (en) * | 2007-12-17 | 2009-06-18 | Siemens Aktiengesellschaft | Machine with optical communication from a first machine part to a second machine part which rotates relative to the first machine part |
| CN101535856A (en) * | 2006-11-16 | 2009-09-16 | 西门子公司 | Rotary transmitter |
| US20100166433A1 (en) * | 2008-12-25 | 2010-07-01 | Kabushiki Kaisha Topcon | Optical signal transfer device |
| CN102723984A (en) * | 2012-05-17 | 2012-10-10 | 中国科学院高能物理研究所 | Data transmission device based on plane reflection in computer tomoscan imaging equipment |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004015463A1 (en) * | 2002-08-09 | 2004-02-19 | Acreo Ab | Mirrors for polymer waveguides |
| CN101535856A (en) * | 2006-11-16 | 2009-09-16 | 西门子公司 | Rotary transmitter |
| US20090154936A1 (en) * | 2007-12-17 | 2009-06-18 | Siemens Aktiengesellschaft | Machine with optical communication from a first machine part to a second machine part which rotates relative to the first machine part |
| US20100166433A1 (en) * | 2008-12-25 | 2010-07-01 | Kabushiki Kaisha Topcon | Optical signal transfer device |
| CN102723984A (en) * | 2012-05-17 | 2012-10-10 | 中国科学院高能物理研究所 | Data transmission device based on plane reflection in computer tomoscan imaging equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20220187542A1 (en) * | 2020-04-29 | 2022-06-16 | Northrop Grumman Systems Corporation | Hollow shaft optical rotary joint |
| US11681105B2 (en) * | 2020-04-29 | 2023-06-20 | Northrop Grumman Systems Corporation | Hollow shaft optical rotary joint |
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