Driving device and medical instrument

Abstract

The invention discloses a driving device and a medical instrument. The driving device comprises a motor and a sensing device. The motor comprises an output shaft, the output shaft is provided with a first end and a second end which are opposite in the axial direction, and a reflective coating layer is arranged on the end face of the first end and used for reflecting light signals. The sensing device and the first end are arranged in a spaced mode in the axial direction. The sensing device is used for emitting optical signals to the reflective coating layer and receiving reflected signals from the reflective coating layer. According to the driving device, the reflecting coating layer is integrated on the output shaft of the motor, a special coded disc structure is omitted, the size is reduced, especially the axial size is reduced, and the integration degree is improved.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and more particularly to a drive device and a medical device. Background Art

[0002] A general drive module includes a motor and an encoder. The motor consists of a rotor, a stator, a motor output shaft, and a support bearing. The encoder consists of a moving part (code disk) and a stationary part (circuit board). The solution of independently designing the motor and the encoder has a relatively large axial height and significantly occupies space.

[0003] Therefore, a drive device and a medical device are needed to at least partially solve the above problems. Summary of the Invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further elaborated in the Detailed Description section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0005] To at least partially solve the above problems, a first aspect of this application provides a drive device, which includes:

[0006] A motor, the motor includes an output shaft, the output shaft has a first end and a second end opposite to each other along the axis, and a reflective coating layer is provided on the end face of the first end, and the reflective coating layer is used to reflect optical signals;

[0007] A sensing device, the sensing device is arranged at an interval from the first end along the axis, and the sensing device is used to emit optical signals to the reflective coating layer and receive reflected signals from the reflective coating layer.

[0008] According to the drive device of this application, a reflective coating layer is integrated on the motor output shaft, eliminating the need for a dedicated code disk structure, reducing the volume, especially reducing the axial dimension, and improving the integration degree.

[0009] Optionally, the reflective coating layer includes:

[0010] A first coating layer, the first coating layer is provided on the end face of the first end of the output shaft;

[0011] A second coating layer, the second coating layer is provided on the first coating layer;

[0012] Wherein, the reflectivity of the first coating layer is different from the reflectivity of the second coating layer. According to the above setting, coating layers with different reflectivities can provide higher recognition accuracy for the sensing device.

[0013] Optionally, the second coating layer includes a first code track, the first code track includes a plurality of reflection window structures, the plurality of reflection window structures are arranged at equal intervals along the circumferential direction of the output shaft around the axis of the output shaft, and the reflection signals of the reflection window structures are mapped to the rotation angle. According to the above settings, when rotating, the reflection window structures of the second coating layer and the first coating layer are alternately sensed, and the judgment accuracy of the angle is high.

[0014] Optionally, the second coating layer further includes a second code track, the second code track includes an index window structure, the index window structure is arranged at intervals along the radial direction of the output shaft inside the first code track, and the reflection signal of the index window structure is mapped to the number of rotation turns. According to the above settings, the number of rotation turns can be identified while judging the angle.

[0015] Optionally, the second coating layer includes a plurality of code tracks, the code tracks are arranged along the circumferential direction of the output shaft around the axis of the output shaft, and the plurality of code tracks are arranged at intervals along the radial direction of the output shaft, and the information mapped by the reflection signals of the plurality of code tracks is different. According to this solution, the setting of multiple code tracks can improve the information obtained by the sensing device and increase the number of detectable items.

[0016] Optionally, the reflective coating layer further includes a substrate layer, the substrate layer is attached to the end face of the first end, and the first coating layer is attached to the substrate layer. According to this solution, the design of the thin plate split type not only has the effect of saving space, but also is conducive to rapid assembly.

[0017] Optionally, the motor further includes a stator and a rotor, the rotor is connected to the output shaft, and the rotor is arranged outside the stator.

[0018] Optionally, the output shaft includes a shaft body, an end cover portion and a connecting portion, the end cover portion is connected to the end of the shaft body, the radial dimension of the end cover portion is larger than the radial dimension of the shaft body, the end cover portion forms the first end of the output shaft, both the stator and the rotor are located in the annular space formed by the shaft body and the connecting portion, and the rotor is fixedly connected to the connecting portion.

[0019] Optionally, the shaft body, the end cover portion and the connecting portion are constructed as an integrally formed structure.

[0020] Optionally, the motor further includes a support structure, the support structure is arranged outside the shaft body and is connected to the shaft body through a bearing, and the stator is arranged outside the support structure.

[0021] Optionally, the sensing device includes a printed circuit board, and the printed circuit board is provided with:

[0022] A light-emitting device for emitting an optical signal to the reflective coating layer; and

[0023] A light-receiving device for receiving the reflected signal of the reflective coating layer.

[0024] The second aspect of the present application provides a medical device including the driving device described in the first aspect above.

[0025] The medical device according to the present application has a technical effect similar to that of the driving device in the first aspect above. Description of the Drawings

[0026] The following drawings of the present application are hereby incorporated as part of the present application for understanding the present application. The embodiments and descriptions of the present application are shown in the drawings to explain the principles of the present application.

[0027] In the drawings:

[0028] Figure 1 is a schematic cross-sectional view of a driving device according to an embodiment of the present application; and

[0029] Figure 2 is a schematic top view of the reflective coating layer of the driving device according to an embodiment of the present application.

[0030] Description of the Reference Numerals:

[0031] 100: Driving device 110: Motor 111: Output shaft

[0032] 112: First end 113: Second end 114: Reflective coating layer

[0033] 115: First coating layer 116: Second coating layer 117: First track

[0034] 118: Reflective window structure 119: Second track 120: Index window structure

[0035] 121: Stator 122: Rotor 123: Shaft body

[0036] 124: End cover part 125: Support structure 126: Bearing

[0037] 128: Connection part 150: Sensing device Detailed Embodiments

[0038] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present application.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprises" and / or "comprising" are used in this specification, they specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof.

[0040] Ordinal numbers such as "first" and "second" cited in the present application are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" does not imply the existence of a "second component" by itself, and the term "second component" does not imply the existence of a "first component" by itself. It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and similar expressions used herein are for illustrative purposes only and are not limiting.

[0041] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings.

[0042] Reference Figure 1 and Figure 2 , a first aspect of the present application provides a driving device 100. The driving device 100 includes a motor 110 and a sensing device 150. The motor 110 includes an output shaft 111. The output shaft 111 has a first end 112 and a second end 113 that are axially opposite. A reflective coating layer 114 is provided on the end face of the first end 112. The reflective coating layer 114 is used to reflect optical signals. The sensing device 150 is axially spaced from the first end 112. The sensing device 150 is used to emit optical signals to the reflective coating layer 114 and receive reflected signals from the reflective coating layer 114.

[0043] According to the driving device of the present application, a reflective coating layer is integrated on the output shaft of the motor, eliminating the need for a dedicated code disk structure, reducing the volume, especially reducing the axial dimension of the motor in transmission output applications, and improving the integration degree.

[0044] For a more specific structure of the driving device 100, continue to refer to Figure 1, the motor 110 further includes a stator 121, a rotor 122, and a support structure 125. Among them, the output shaft 111 is connected to the support structure 125 through a bearing 126, the rotor 122 is connected to the output shaft 111, and the rotor 122 is disposed outside the stator 121.

[0045] More specifically, the output shaft 111 includes a shaft body 123, an end cover portion 124, and a connecting portion 128. The support structure 125 can be configured to be annular, and the shaft body 123 is connected to the support structure 125 through a bearing 126. The shaft body 123 is located inside the support structure 125, and the stator 121 is spaced outside the support structure 125. And, the radial dimension of the end cover portion 124 is larger than the radial dimension of the shaft body 123, and it is disposed at the end of the shaft body 123 to form the first end 112 of the output shaft 111. The connecting portion 128 is connected to the periphery of the end cover portion 124 and extends along the axial direction of the shaft body 123, so that the connecting portion 128 is located outside the shaft body 123. An annular space is formed between the shaft body 123 and the connecting portion 128, so that the stator 121 and the rotor 122 are installed in the annular space. And, the connecting portion 128 is located outside the stator 121, and the rotor 122 is fixedly connected to the connecting portion 128. As shown in the figure, the rotor 122 is connected to the inner side of the connecting portion 128 and forms a gap with the stator 121. In the solution, the outer rotor structure of the motor 110 enables the output shaft to be provided with an end face having a larger area, and this end face can integrate a part of the structure of the sensing device. Further, the shaft body 123, the end cover portion 124, and the connecting portion 128 are configured as an integrally formed structure, improving the integration degree of the structure.

[0046] The second end 113 of the sensing output shaft 111 can be used as the output transmission structure of the motor to connect with other transmission structures.

[0047] The sensing device 150 includes a light emitting device and a light receiving device. For example, the sensing device can be an optical encoder. The light emitting device is used to emit a light signal to the reflection coating layer 114, and the light receiving device is used to receive the reflection signal of the reflection coating layer 114. As an alternative embodiment, the sensing device 150 is configured as a printed circuit board, and the light emitting device and the light receiving device are disposed on the printed circuit board.

[0048] For the specific structure of the reflection coating layer 114, refer to Figure 2 , the reflection coating layer 114 includes a first coating layer 115 and a second coating layer 116. The first coating layer 115 is disposed on the end face of the first end 112 of the output shaft 111, and the second coating layer 116 is disposed on the first coating layer 115. And, the reflectivity of the first coating layer 115 is different from the reflectivity of the second coating layer 116. Thus, the sensing device 150 can easily distinguish the first coating layer 115 and the second coating layer 116 according to the different reflectivities, improving the recognition accuracy of the sensing device 150.

[0049] The second coating layer 116 includes a first code track 117 and a second code track 119. The first code track 117 is arranged circumferentially around the axis of the output shaft 111 along the circumference of the output shaft 111. The second code track 119 is arranged inside or outside the first code track 117. In the illustrated embodiment, the second code track 119 is arranged inside the first code track 117.

[0050] More specifically, the first code track 117 includes a plurality of reflection window structures 118, and the plurality of reflection window structures 118 are arranged at equal intervals circumferentially around the axis of the output shaft 111 along the circumference of the output shaft 111. The reflected signals of the reflection window structures 118 are mapped to the rotation angle. For example, each reflection window structure 118 corresponds to a different angle. Thus, when rotating, the reflection window structures 118 of the second coating layer 116 and the first coating layer 115 are alternately sensed, and the judgment accuracy of the angle is high.

[0051] The second code track 119 includes an index window structure 120, and the index window structure is arranged at intervals along the radial direction of the output shaft 111 inside the first code track 117. The reflected signal of the index window structure 120 is mapped to the number of rotation turns. For example, every time the index window structure 120 is sensed, the number of turns is incremented by one.

[0052] As can be seen from the above, the first coating layer 115 can be understood as the base of the reflection window structure 118 and the index window structure 120, and the first coating layer 115 provides a stable reflection environment for the second coating layer 116.

[0053] As an example, when the driving device 100 works, the light emitting device of the sensing device 150 emits light, and the light is received by the light receiving device after being reflected by the second coating layer 116. After the light is reflected by the high reflection area, the sensing device 150 obtains a level signal, denoted as state 1. After the light passes through the low reflection area, most of the light is absorbed, and only a small part is reflected back to the light receiving device, and the sensing device 150 obtains a weak signal, denoted as state 0. The sensing device 150 can obtain the corresponding angle information according to the switching between state 0 and state 1. Among them, the reflectivity of the first coating layer 115 can be lower than that of the second coating layer 116, so that the first coating layer 115 forms the above-mentioned low reflection area.

[0054] As an alternative embodiment, the second coating layer 116 includes a plurality of code tracks, wherein the code tracks are arranged circumferentially around the axis of the output shaft 111 along the circumference of the output shaft 111, and the plurality of code tracks are arranged at intervals along the radial direction of the output shaft 111, and the information mapped by the reflected signals of each code track is different. For example, in addition to the above-mentioned first code track 117 and the second code track 119 located inside the first code track 117, a third code track (not shown) can also be arranged outside the first code track 117. The arrangement of multiple code tracks can improve the information obtained by the sensing device 150 and increase the number of detectable items.

[0055] As yet another alternative embodiment, the reflective coating layer 114 may further include a substrate layer that is attached to the end face of the first end 112, and the first coating layer 115 is attached to the substrate layer. Such a thin plate split design not only has the effect of saving space but also facilitates rapid assembly. Among them, the substrate layer can be made of a plate such as a glass plate.

[0056] The second aspect of the present application provides a medical device, including the driving device 100 of the above first aspect.

[0057] The medical device according to the present application has a technical effect similar to that of the driving device 100 of the above first aspect.

[0058] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present application. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The features described in one embodiment herein can be applied alone or in combination with other features in another embodiment, unless the feature is not applicable or otherwise stated in that other embodiment.

[0059] The present application has been illustrated by the above embodiments. However, it should be understood that the above embodiments are only for the purpose of exemplification and illustration, and the present application is not limited to the above embodiments. According to the teachings of the present application, more variations and modifications can be made, and these variations and modifications all fall within the scope claimed by the present application.

Claims

1. A driving device, characterized in that, The driving device includes: a motor, the motor includes an output shaft, the output shaft has a first end and a second end opposite to each other along the axis, a reflective coating layer is provided on the end face of the first end, and the reflective coating layer is used for reflecting optical signals; a sensing device, the sensing device is arranged at an interval from the first end along the axis, and the sensing device is used for emitting an optical signal to the reflective coating layer and receiving a reflected signal from the reflective coating layer.

2. The driving device according to claim 1, characterized in that, The reflective coating layer includes: a first coating layer, the first coating layer is provided on the end face of the first end of the output shaft; a second coating layer, the second coating layer is provided on the first coating layer; wherein, the reflectivity of the first coating layer is different from the reflectivity of the second coating layer.

3. The driving device according to claim 2, characterized in that, The second coating layer includes a first track, the first track includes a plurality of reflection window structures, and the plurality of reflection window structures are arranged at equal intervals along the circumferential direction of the output shaft around the axis of the output shaft, and the reflected signal of the reflection window structure is mapped to the rotation angle.

4. The driving device according to claim 3, characterized in that, The second coating layer further includes a second track, the second track includes an index window structure, the index window structure is arranged at an interval from the inside of the first track along the radial direction of the output shaft, and the reflected signal of the index window structure is mapped to the number of rotation turns.

5. The driving device according to claim 2, characterized in that, The second coating layer includes a plurality of tracks, the tracks are arranged along the circumferential direction of the output shaft around the axis of the output shaft, and the plurality of tracks are arranged at intervals along the radial direction of the output shaft, and the information mapped by the reflected signals of the plurality of tracks is different.

6. The driving device according to claim 2, characterized in that, The reflective coating layer further includes a substrate layer, the substrate layer is attached to the end face of the first end, and the first coating layer is attached to the substrate layer.

7. The driving device according to any one of claims 1-6, characterized in that, The motor further includes a stator and a rotor, the rotor is connected to the output shaft, and the rotor is arranged outside the stator.

8. The driving device according to claim 7, characterized in that, The output shaft includes a shaft body, an end cover portion and a connecting portion, the end cover portion is connected to the end of the shaft body, the radial dimension of the end cover portion is greater than the radial dimension of the shaft body, the end cover portion forms the first end of the output shaft, and both the stator and the rotor are located in the annular space formed by the shaft body and the connecting portion, and the rotor is fixedly connected to the connecting portion.

9. The driving device according to claim 8, characterized in that, The shaft body, the end cover portion and the connecting portion are constructed as an integrally formed structure.

10. The driving device according to claim 8, characterized in that, The motor further includes a support structure, at least part of the support structure is located in the annular space and is connected to the shaft body through a bearing, and the stator is arranged outside at least part of the support structure.

11. The driving device according to any one of claims 1-6, characterized in that, The sensing device includes a printed circuit board, and the printed circuit board is provided with: a light emitting device, the light emitting device is used for emitting an optical signal to the reflective coating layer; and a light receiving device, the light receiving device is used for receiving the reflected signal of the reflective coating layer.

12. A medical device, characterized in that, Including the driving device according to any one of claims 1-11.

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