Calibration device for an oral scanner

Abstract

The present application provides a kind of calibration device for oral scanner, including base;Mobile part is arranged on the base, the mobile part can be moved on the base along the extension direction of the calibration device, the mobile part includes: drive structure;Positioning part is connected to the drive structure, and is driven by the drive structure, the positioning part has first feature part and second feature part, the second feature part is different from the first feature part;And calibration plate is connected to the positioning part;Circuit board is arranged on one side of the mobile part;And sensor is arranged on the circuit board, the sensor is configured to detect the first feature part and the second feature part, to determine the position of the mobile part.The present application can obtain the position information of the mobile part by the different signals sensed by the sensor at different feature parts, so as to achieve positioning.It should be noted that the present application can be calibrated even if only one sensor is used.

Description

Technical Field

[0001] This invention relates to the field of oral scanning technology, and more particularly to a calibration device for an oral scanner. Background Technology

[0002] Modern people value oral health, leading to the booming development of the dental industry and the development of various related instruments. An intraoral scanner is one common dental instrument that can directly obtain detailed images of a patient's teeth through optical impressions, facilitating impression taking and subsequent treatment. After manufacturing or a period of use, the accuracy of an intraoral scanner will decrease, requiring calibration. Generally, an intraoral scanner can be used to establish the 3D spatial coordinates of a known object for comparison when scanning actual objects later. There are two common approaches: one is to use a static object of known volume; the other is to use a dynamic motion kit with a known trajectory. This constructs a dynamic calibrator for the intraoral scanner, containing rotating components and a chart, allowing the scanner to take pictures along a known path to establish the 3D spatial coordinates.

[0003] However, the scanning efficiency of existing technologies is not high. Therefore, it is necessary to design a new type of calibration device for oral scanners to overcome the above-mentioned shortcomings. Summary of the Invention

[0004] The purpose of this invention is to provide a calibration device for an oral scanner that can effectively improve calibration efficiency.

[0005] To achieve the above objectives, the present invention provides a calibration device for an oral scanner, the calibration device comprising: a base; a movable part disposed on the base, the movable part being movable on the base along the extending direction of the calibration device, the movable part comprising: a drive structure; a positioning part connected to and driven by the drive structure, the positioning part having a first feature portion and a second feature portion, the second feature portion being different from the first feature portion; a calibration plate connected to the positioning part; a circuit board disposed on one side of the movable part; and a sensor disposed on the circuit board, the sensor being configured to detect the first feature portion and the second feature portion to determine the position of the movable part.

[0006] Preferably, the positioning part includes: a screw connected to the drive structure; and an attachment part connected to the screw, to which the calibration plate is attached.

[0007] Preferably, the positioning part further includes a connecting part for connecting the screw and the attachment part.

[0008] Preferably, the first feature portion and / or the second feature portion are disposed on the screw.

[0009] Preferably, the first feature portion and / or the second feature portion are disposed on the attachment portion.

[0010] Preferably, the difference between the second feature portion and the first feature portion includes one or a combination of cross-sectional dimensions, shape, color, material, roughness, and magnetism.

[0011] Preferably, the position of the moving part is determined based on a plurality of different electrical signals generated by the sensor when the sensor senses the first feature portion and the second feature portion.

[0012] Preferably, these multiple electrical signals are potential signals.

[0013] Preferably, the positioning part also has a third feature portion, which is different from the first feature portion and the second feature portion.

[0014] Preferably, the sensor includes one or a combination of a light sensor, a force sensor, and a magnetic sensor.

[0015] Preferably, the circuit board is perpendicular to the base.

[0016] Preferably, the calibration device further includes: a housing for accommodating the base, the movable part, the circuit board, and the sensor, the housing having an opening for inserting an intraoral scanner.

[0017] Compared to existing technologies, the calibration device for an oral scanner provided by this invention has a positioning part that is not limited to a screw but includes feature portions with different characteristics. Since the positioning part is not limited to a screw, it is not necessary to lengthen the screw, thus avoiding axial deviation caused by increasing the screw length. This invention obtains position information of the moving part by using different signals sensed by sensors at different feature portions, thereby achieving positioning. More sensors and / or more feature portions ensure that more parts of the moving part are correctly positioned, thereby improving the accuracy of oral scanner calibration. Furthermore, more sensors and / or more feature portions can reduce discrimination time. However, even using only a single sensor, the calibration device according to this invention can perform calibration. Attached Figure Description

[0018] Figures 1A to 1C This is a schematic diagram of a calibration device used in an oral scanner;

[0019] Figures 2A to 14B These are schematic diagrams of various embodiments of the calibration device and the sensor. Detailed Implementation

[0020] To provide a further understanding of the purpose, structure, features and functions of the present invention, detailed descriptions are provided below with reference to embodiments.

[0021] Certain terms are used in the specification and claims to refer to specific elements. It will be understood by those skilled in the art that manufacturers may use different names to refer to the same element. This specification and claims do not distinguish elements by differences in name, but rather by differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to".

[0022] Please refer to Figures 1A to 1C This illustrates an exemplary calibration device 10 for an oral scanner. The calibration device 10 includes a base 100, a movable part 200, a circuit board 400, and a sensor 500. The movable part 200 is disposed on the base 100. The movable part 200 is movable along the extension direction of the calibration device 10 on the base 100 (in... Figures 1A to 1C The moving part 200 (with the Y direction as the reference point) moves. The moving part 200 includes a drive structure 210, a positioning part 220, and a calibration plate 230. The positioning part 220 is connected to and driven by the drive structure 210. The positioning part 220 has a first feature portion 310 and a second feature portion 320, the second feature portion 320 being different from the first feature portion 310. The calibration plate 230 is connected to the positioning part 220. A circuit board 400 is disposed on one side of the moving part 200. A sensor 500 is disposed on the circuit board 400. The sensor 500 is configured to detect the first feature portion 310 and the second feature portion 320 to determine the position of the moving part 200.

[0023] More specifically, the drive structure 210 of the moving part 200 can drive the positioning part 220 connected thereto on the base 100 along the extending direction of the correction device 10 (in Figures 1A to 1C The drive structure 210 moves back and forth (in the Y direction) and drives the calibration plate 230 to move back and forth as well. According to some embodiments, the drive structure 210 can be a motor, but is not limited to this.

[0024] According to some embodiments, the positioning portion 220 may include a screw 222 and an attachment portion 224. The screw 222 is connected to the drive structure 210. The attachment portion 224 is connected to the screw 222. A calibration plate 230 is attached to the attachment portion 224. The attachment portion 224 may have a bevel, and the calibration plate 230 is attached to the bevel, but is not limited thereto. In some embodiments, the positioning portion 220 further includes a connecting portion 226 connecting the screw 222 and the attachment portion 224. According to some embodiments, at least one of the first feature portion 310 and the second feature portion 320 may be disposed on the screw 222. According to some embodiments, at least one of the first feature portion 310 and the second feature portion 320 may be disposed on the attachment portion 224. In some embodiments, the second feature portion 320 differs from the first feature portion 310 in that it is selected from at least one of the group consisting of cross-sectional size, shape, color, material, roughness, and magnetism, but is not limited thereto. The positioning portion 220 has multiple feature portions 300, including a first feature portion 310 and a second feature portion 320. The positioning portion 220 may also have a third feature portion. In some embodiments, the third feature portion is different from the first feature portion 310 and the second feature portion 320. In other embodiments, the third feature portion may be the same as one of the first feature portion 310 and the second feature portion 320. Similarly, the positioning portion 220 may have a fourth feature portion, a fifth feature portion, a sixth feature portion, and so on. The positioning portion 220 may be integrally formed, but is not limited thereto.

[0025] According to some embodiments, the circuit board 400 may be perpendicular to the base 100, but is not limited thereto. The sensor 500 is disposed on the circuit board 400. Figures 1A to 1C The diagram exemplarily shows two sensors 510 and 520, but the number of sensors can be one or more. Arranging multiple sensors 500 on the same circuit board 400 can increase accuracy, reduce assembly tolerances, simplify the design of the circuit board 400, and reduce costs. The types of sensors 500 depend on the differences between the feature portions. In some embodiments, each of the sensors 500 is selected from the group consisting of light sensors, force sensors, and magnetic sensors, but is not limited thereto. According to some embodiments, the position of the moving part 200 can be determined based on multiple different electrical signals generated by the sensors 500 when they sense the first feature portion 310 and the second feature portion 320. These electrical signals can be, for example, potential signals, but are not limited thereto.

[0026] According to some embodiments, the calibration device 10 may further include a housing 600 that houses the base 100, the movable part 200, the circuit board 400, and the sensor 500. The housing 600 has an opening 610 for placing an oral scanner.

[0027] Figures 2A-2B Image to Figures 14A-14B These are schematic diagrams of various embodiments of the calibration device and the sensor.

[0028] Please refer to Figures 2A-2B It shows an example of a combination of the characteristic parts of the calibration device and the sensor and the sensing results therein. Figure 2A The positioning part 220, its feature portions, and two corresponding sensors 510A and 520A are shown in a simplified diagram. The moving direction D of the positioning part 220 is parallel to the extending direction of the correction device 10. In this embodiment, the first feature portion 310A and the second feature portion 320A have different cross-sectional dimensions, and correspondingly, the two sensors 510A and 520A are light sensors. The position of the moving part 200 can be determined by the sensing results of the sensors 510A and 520A on the first feature portion 310A and the second feature portion 320A. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensors 510A obtain the following corresponding movement of the positioning part 220: Figure 2B (a) The change in potential over time, and the movement of the positioning part 220 corresponding to the movement of the sensor 520A, are obtained as follows: Figure 2B (b) The change of potential over time. The first feature portion 310A and the second feature portion 320A will generate different potential signals, for example, corresponding to potentials V1 and V2 respectively. The same potential signal in Figure 2B The time difference T between (a) and (b) represents the time taken for the moving unit 200 to travel the distance between the two sensors 510A and 520A, and the moving speed can be calculated from this. Alternatively, if the moving speed is known, the distance between the two sensors 510A and 520A can be calculated from the time difference T. Furthermore, the moving distance of the moving unit 200 can be calculated based on the signal interval time. Additionally, at time point t, from... Figure 2B (a) It can be known that the second feature portion 320A of the positioning unit 220 has passed the position of the sensor 510A. The sensor 510A senses a feature portion after the second feature portion 320A. Figure 2B (b) It can be known that the sensor 520A senses the second feature portion 320A, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0029] Please refer to Figures 3A-3BIn this embodiment, the first feature portion 310B, the second feature portion 320B, the third feature portion 330B, the fourth feature portion 340B, and the fifth feature portion 350B have different shapes. Correspondingly, the two sensors 510B and 520B are light sensors. By sensing two or more of the first feature portion 310B to the fifth feature portion 350B through the sensors 510B and 520B, the position of the moving part 200 can be determined. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 510B obtains the following result corresponding to the movement of the positioning part 220: Figure 3B (a) The change in potential over time, and the movement of the positioning part 220 corresponding to the movement of the sensor 520B, are obtained as follows: Figure 3B (b) The change of potential over time. Different potential signals are generated from the first feature portion 310B to the fifth feature portion 350B. The moving distance corresponding to the moving part 200 can be calculated based on the signal interval time. Furthermore, at time point t, from Figure 3B (a) It can be known that sensor 510B senses the third feature portion 330B, from which... Figure 3B (b) It can be known that the sensor 520B senses the fourth feature portion 340B, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0030] Please refer to Figures 4A-4B In this embodiment, the first feature portion 310C, the second feature portion 320C, and the third feature portion 330C have different colors, such as silver, black, and gold, respectively. Correspondingly, the two sensors 510C and 520C are light sensors. By sensing two or more of the first feature portion 310C to the third feature portion 330C through the sensors 510C and 520C, the position of the moving part 200 can be determined. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 510C obtains the following result corresponding to the movement of the positioning part 220: Figure 4B (a) The change in potential over time, and the movement of the positioning part 220 corresponding to the movement of the sensor 520C, are obtained as follows: Figure 4B (b) The potential changes over time. Different potential signals are generated from the first characteristic portion 310C to the third characteristic portion 330C. The same potential signal... Figure 4BThe time difference T between (a) and (b) represents the time taken for the moving unit 200 to travel the distance between the two sensors 510C and 520C, and the moving speed can be calculated from this. Alternatively, if the moving speed is known, the distance between the two sensors 510C and 520C can be calculated from the time difference T. Furthermore, the moving distance of the moving unit 200 can be calculated based on the signal interval time. Additionally, at time point t, from... Figure 4B (a) It can be known that sensor 510C senses the third feature portion 330C, from which Figure 4B (b) It can be known that the sensor 520C senses the second feature portion 320C, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0031] Please refer to Figures 5A-5B In this embodiment, the first feature portion 310D, the second feature portion 320D, and the third feature portion 330D are made of different materials. Correspondingly, the two sensors 510D and 520D are light sensors. The position of the moving part 200 can be determined by the sensing results of sensors 510D and 520D for any two or more of the first feature portion 310D to the third feature portion 330D. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 510D obtains the following result corresponding to the movement of the positioning part 220: Figure 5B (a) The change in potential over time, and the movement of the positioning part 220 corresponding to the movement of the sensor 520D, are obtained as follows: Figure 5B (b) The change of potential over time. The first feature portion 310D to the third feature portion 330D will generate different potential signals, which, for example, correspond to potentials V1, V2, and V3 respectively. The same potential signal in... Figure 5B The time difference T between (a) and (b) represents the time taken for the moving unit 200 to travel the distance between the two sensors 510D and 520D, and the moving speed can be calculated from this. Alternatively, if the moving speed is known, the distance between the two sensors 510D and 520D can be calculated from the time difference T. Furthermore, the moving distance of the moving unit 200 can be calculated based on the signal interval time. Additionally, at time point t, from... Figure 5B (a) It can be known that sensor 510D senses the third feature portion 330D, from which... Figure 5B (b) It can be known that the sensor 520D senses the second feature portion 320D, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0032] Please refer to Figures 6A-6B In this embodiment, the first feature portion 310E, the second feature portion 320E, and the third feature portion 330E have different roughnesses. Correspondingly, the two sensors 510E and 520E are mechanical sensors. For example, sensors 510E and 520E can use a striker to sense the surface roughness of the contacted positioning portion 220, but are not limited to this. By using the sensing results of sensors 510E and 520E for any two or more of the first feature portion 310E to the third feature portion 330E, the position of the moving part 200 can be determined. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 510E obtains the following result corresponding to the movement of the positioning part 220: Figure 6B (a) The change in potential over time, and the movement of the positioning part 220 corresponding to the movement of the sensor 520E, are obtained as follows: Figure 6B (b) The change of potential over time. The first feature portion 310E to the third feature portion 330E will generate different potential signals, which, for example, correspond to potentials V1, V2, and V3 respectively. The same potential signal in... Figure 6B The time difference T between (a) and (b) represents the time taken for the moving unit 200 to travel the distance between the two sensors 510E and 520E, and the moving speed can be calculated from this. Alternatively, if the moving speed is known, the distance between the two sensors 510E and 520E can be calculated from the time difference T. Furthermore, the moving distance of the moving unit 200 can be calculated based on the signal interval time. Additionally, at time point t, from... Figure 6B (a) It can be known that sensor 510E senses the third feature portion 330E, from which... Figure 6B (b) It can be known that the sensor 520E senses the second feature portion 320E, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have the other details mentioned above, which will not be repeated here.

[0033] Please refer to Figures 7A-7BIn this embodiment, the first feature portion 310F and the second feature portion 320F have different magnetic properties, and correspondingly, the two sensors 510F and 520F are magnetic sensors. For example, a magnet or electromagnet coil can be placed on the positioning part 220, thus generating different magnetic forces in different parts of the positioning part 220, but this is not limited to this. By sensing the first feature portion 310F and the second feature portion 320F with the sensors 510F and 520F, the position of the moving part 200 can be determined. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 510F obtains the following result corresponding to the movement of the positioning part 220: Figure 7B (a) The change in potential over time, and the movement of the positioning part 220 corresponding to the movement of the sensor 520F, are obtained as follows: Figure 7B (b) The change of potential over time. The first feature portion 310F and the second feature portion 320F will generate different potential signals, for example, corresponding to potentials V1 and V2 respectively. The same potential signal in Figure 7B The time difference T between (a) and (b) represents the time taken for the moving unit 200 to travel the distance between the two sensors 510F and 520F, and the moving speed can be calculated from this. Alternatively, if the moving speed is known, the distance between the two sensors 510F and 520F can be calculated from the time difference T. Furthermore, the moving distance of the moving unit 200 can be calculated based on the signal interval time. Additionally, at time point t, from... Figure 7B (a) It can be known that the second feature portion 320F of the positioning unit 220 has passed the position of the sensor 510F. The sensor 510F senses a feature portion after the second feature portion 320F. Figure 7B (b) It can be known that the sensor 520F senses the second feature portion 320F, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0034] Although Figures 2A-2B to Figures 7A-7BThe embodiments all use two sensors, but it is also possible to implement more sensors in a similar manner. When using two or more sensors, it is possible to determine the position of the moving part 200 based on the sensing results of each sensor at power-on. Furthermore, the position of the moving part 200 can be adjusted so that a specific element corresponds to the position of the closest sensor. Alternatively, the sensors can be placed at important positions such as calibration start point, end point, and optimal focus point. In addition, even if the drive structure 210 loses synchronization, the rotation of the drive structure 210 can be adjusted according to the sensing results of each sensor until the position is accurate before calibration. More sensors and / or more feature parts can ensure that the position of more parts of the moving part 200 is correct, thereby improving the accuracy of the oral scanner calibration. In addition, more sensors and / or more feature parts can reduce the discrimination time.

[0035] However, even using only one sensor, the calibration device according to the present invention can perform calibration. The following description pertains to such embodiments.

[0036] Please refer to Figures 8A-8B In this embodiment, the first feature portion 310G and the second feature portion 320G have different cross-sectional dimensions, and a single sensor 500G, which is a light sensor, is correspondingly provided. The position of the moving part 200 can be determined by the sensing results of the sensor 500G on the first feature portion 310G and the second feature portion 320G. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 500G obtains the following result corresponding to the movement of the positioning part 220: Figure 8B The potential changes over time. The first feature portion 310G and the second feature portion 320G will generate different potential signals, which, for example, correspond to potentials V1 and V2, respectively. From Figure 8B The movement distance of the moving unit 200 can be calculated based on the signal interval. Furthermore, from... Figure 8B It can be determined which feature segment the sensor 500G sensed at time point t, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0037] Please refer to Figures 9A-9BThis embodiment also relates to feature portions with different cross-sectional dimensions. The connecting portion 226H in this embodiment has a gradually changing cross-sectional dimension, constituting a gradually changing feature portion 310H, which can be considered a combination of two or more feature portions. When the positioning portion 220 moves backward in the moving direction D (away from the opening 610, i.e., to the left in the figure), the sensor 500H sequentially senses the rear endpoint, optimal focal point, and front endpoint of the feature portion 310H at time points t1, t2, and t3. Therefore, the sensor 500H can be positioned at the rear endpoint of the corresponding feature portion 310H. If, after power-on, the positioning portion 220 moves backward and a gradually rising potential is measured, it can be determined that the moving direction of the positioning portion 220 is correct, and the feature portion 310H used for positioning will gradually pass through and be sensed by the sensor 500H. If, after power-on, the positioning portion 220 moves forward and a constant potential is measured, the moving direction of the positioning portion 220 is incorrect and it should rotate in the opposite direction. Using this concept, when using only one sensor, the sensor can be set to a specific point corresponding to the positioning part, preferably the endpoint of the feature part used for positioning. After power-on, the driving structure 210 is moved in a certain direction while the sensing results are read. The position of the feature part used for positioning to reach the sensor is determined by the feature change corresponding to the sensing results, and then calibration is performed. Even if the driving structure 210 loses synchronization, calibration can be performed again when the position is accurate. More feature parts can ensure that more parts of the moving part 200 are in the correct position, thereby improving the accuracy of the oral scanner calibration. This embodiment may have other details as described above, which will not be repeated here.

[0038] Please refer to Figures 10A-10B In this embodiment, the first feature portion 310I, the second feature portion 320I, the third feature portion 330I, the fourth feature portion 340I, and the fifth feature portion 350I have different shapes, and a single sensor 500I, which is a light sensor, is provided for each. The position of the moving part 200 can be determined by the sensing results of the sensor 500I for any two or more of the first feature portion 310B to the fifth feature portion 350B. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 500I obtains the following result corresponding to the movement of the positioning part 220: Figure 10B The potential changes over time. The first feature portion 310I to the fifth feature portion 350I will generate different potential signals. From... Figure 10B The movement distance of the moving unit 200 can be calculated based on the signal interval. Furthermore, from... Figure 10BIt can be determined which feature segment the sensor 500I sensed at time point t, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0039] Please refer to Figures 11A-11B In this embodiment, the first feature portion 310J, the second feature portion 320J, and the third feature portion 330J have different colors, such as silver, black, and gold, respectively, and are each equipped with a single sensor 500J, which is a light sensor. The position of the moving part 200 can be determined by the sensing results of any two or more of the first feature portion 310J to the third feature portion 330J by the sensor 500J. For example, when the positioning part 220 moves forward in the moving direction D (closer to the opening 610, i.e., to the right in the figure), the sensor 500J obtains the change in potential over time as shown in Figure 11B corresponding to the movement of the positioning part 220. The first feature portion 310J to the third feature portion 330J will generate different potential signals. Figure 11B The movement distance of the moving unit 200 can be calculated based on the signal interval. Furthermore, from... Figure 11B It can be determined which feature segment the sensor 500J sensed at time point t, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0040] Please refer to Figures 12A-12B In this embodiment, the first feature portion 310K, the second feature portion 320K, and the third feature portion 330K are made of different materials, and a single sensor 500K, which is a photosensor, is provided for each. The position of the moving part 200 can be determined by the sensing results of the sensor 500K for any two or more of the first feature portion 310K to the third feature portion 330K. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 500K obtains the following result corresponding to the movement of the positioning part 220: Figure 12B The potential changes over time. The first characteristic portion 310K to the third characteristic portion 330K will generate different potential signals, which, for example, correspond to potentials V1, V2, and V3 respectively. From Figure 12B The movement distance of the moving unit 200 can be calculated based on the signal interval. Furthermore, from... Figure 12BIt can be determined which feature segment the sensor 500I sensed at time point t, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0041] Please refer to Figures 13A-13B In this embodiment, the first feature portion 310L, the second feature portion 320L, and the third feature portion 330L have different roughnesses, and a single sensor 500L, which is a mechanical sensor, is provided for each. For example, the sensor 500L can use a striker to sense the surface roughness of the contacted positioning portion 220, but it is not limited to this. By sensing the results of any two or more of the first feature portion 310L to the third feature portion 330L by the sensor 500L, the position of the moving part 200 can be determined. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 500L obtains the following result corresponding to the movement of the positioning part 220: Figure 13B The graph shows the change of potential over time. The first characteristic portion 310L to the third characteristic portion 330L generate different potential signals, which, for example, correspond to potentials V1, V2, and V3, respectively. From... Figure 13B The movement distance of the moving unit 200 can be calculated based on the signal interval. Furthermore, from... Figure 13B It can be determined which feature segment the sensor 500I sensed at time point t, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0042] Please refer to Figures 14A-14B In this embodiment, the first feature portion 310M and the second feature portion 320M have different magnetic properties, and a single sensor 500M, which is a magnetic sensor, is provided accordingly. For example, a magnet or electromagnet coil can be placed on the positioning part 220, thus generating different magnetic forces in different parts of the positioning part 220, but it is not limited to this. By sensing the first feature portion 310M and the second feature portion 320M with the sensor 500M, the position of the moving part 200 can be determined. For example, when the positioning part 220 moves forward (closer to the opening 610, i.e., to the right in the figure) in the moving direction D, the sensor 500M obtains the following result corresponding to the movement of the positioning part 220: Figure 14B The potential changes over time. The first feature portion 310M and the second feature portion 320M will generate different potential signals, which, for example, correspond to potentials V1 and V2, respectively. From Figure 14BThe movement distance of the moving unit 200 can be calculated based on the signal interval. Furthermore, from... Figure 14B It can be determined which feature segment the sensor 500I sensed at time point t, thereby obtaining the position of each component of the moving part 200 (including the drive structure 210, calibration plate 230, etc.) at time point t. This embodiment may have other details as described above, which will not be repeated here.

[0043] In summary, the present invention provides a calibration device for an oral scanner, wherein the positioning part is not limited to a screw and includes feature portions with different characteristics. Since the positioning part is not limited to a screw, it is not necessary to lengthen the screw, thus avoiding axial deviation caused by increasing the screw length. The present invention obtains position information of the moving part by sensing different signals from different feature portions, thereby achieving positioning. More sensors and / or more feature portions ensure that more parts of the moving part are correctly positioned, thereby improving the accuracy of oral scanner calibration. Furthermore, more sensors and / or more feature portions can reduce discrimination time. However, even using only a single sensor, the calibration device according to the present invention can perform calibration.

[0044] The present invention has been described by the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A calibration device for an oral scanner, characterized in that, The calibration device includes: Base; A movable part is disposed on the base, and the movable part is movable on the base along the extending direction of the correction device. The movable part includes: Drive structure; A positioning part, connected to and driven to rotate by the drive structure, includes a screw connected to the drive structure and an attachment part connected to the screw. The positioning part rotates to move along the extending direction. The positioning part has a first feature portion and a second feature portion, which are circumferentially arranged at different positions on the positioning part, and the second feature portion is different from the first feature portion. The calibration plate is attached to the attachment part; A circuit board is disposed on one side of the movable part; and A sensor, disposed on the circuit board, is configured to detect the first feature portion and the second feature portion to determine the position of the moving part.

2. The calibration device as described in claim 1, characterized in that, The positioning unit also includes: A connecting part is used to connect the screw and the attachment part.

3. The calibration device as described in claim 1, characterized in that, The first feature portion and / or the second feature portion are disposed on the screw.

4. The calibration device as described in claim 1, characterized in that, The first feature portion and / or the second feature portion are disposed on the attachment portion.

5. The calibration device as described in claim 1, characterized in that, The differences between the second feature portion and the first feature portion include one or a combination of the following: cross-sectional dimensions, shape, color, material, roughness, and magnetism.

6. The calibration device as described in claim 1, characterized in that, The position of the moving part is determined based on multiple different electrical signals generated by the sensor when the sensor senses the first feature portion and the second feature portion.

7. The calibration device as described in claim 6, characterized in that, These multiple electrical signals are potential signals.

8. The calibration device as described in claim 1, characterized in that, The positioning part also has a third feature portion, which is different from the first feature portion and the second feature portion.

9. The calibration device as described in claim 1, characterized in that, The sensor includes one or a combination of light sensors, force sensors, and magnetic sensors.

10. The calibration device as claimed in claim 1, characterized in that, The circuit board is perpendicular to the base.

11. The calibration device as claimed in claim 1, characterized in that, The calibration device also includes: The housing is used to house the base, the movable part, the circuit board, and the sensor. The housing has an opening for inserting the intraoral scanner.

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