Calibration device and method for oral cavity scanner

Abstract

The invention relates to the field of oral cavity scanning, and provides a calibration device for an oral cavity scanner, and the calibration device comprises a driving assembly, a first transmission assembly, a second transmission assembly, a calibration assembly, and a scanning window. The scanning window is used for the oral cavity scanner to scan the calibration assembly; the driving assembly is used for driving the first transmission assembly to rotate and move relative to the scanning window; the calibration assembly is connected to the first transmission assembly and moves relative to the scanning window along with the first transmission assembly; the second transmission assembly is connected to the first transmission assembly and the calibration assembly and used for enabling the calibration assembly to rotate along with the first transmission assembly. According to the oral cavity scanner, the first transmission assembly is driven by the driving assembly, so that the calibration assembly is driven by the first transmission assembly and the second transmission assembly to move and rotate relative to the scanning window, the calibration assembly has more change positions in a three-dimensional space, and more accurate reference parameters of an optical device in the oral cavity scanner can be obtained.

Description

Technical Field

[0001] The present invention relates to the field of oral scanning, and in particular to a calibration device and method for an oral scanner. Background Art

[0002] As we all know, the volume of an object changes with temperature. When the volume of an optical element changes, the optical performance will change.

[0003] Therefore, when the optical performance of the internal optical components in the oral scanner product changes, it will affect the scanning accuracy, causing the user's scanned data to deviate greatly from the actual value, and the oral scanner needs to be recalibrated.

[0004] In oral scanner products, the conventional calibration method is to make a special calibration plate, use it to collect images at different distances, process and calculate the collected images, and thus obtain a set of benchmark parameters. However, the calibration plate only has distance changes, and the changes are not rich enough, resulting in the obtained benchmark parameters being inaccurate. Summary of the invention

[0005] In view of the shortcomings of the prior art, an object of the present invention is to provide a calibration device for an oral scanner which can improve the calibration effect.

[0006] To solve the above problems, the present invention provides the following technical solutions: In a first aspect, an embodiment of the present application provides a calibration device for an oral scanner, the calibration device comprising: a driving assembly, a first transmission assembly, a second transmission assembly, a calibration assembly, and a scanning window; The scanning window is used for the oral scanner to scan the calibration component; The driving assembly is used to drive the first transmission assembly to rotate and move relative to the scanning window; The calibration component is connected to the first transmission component, and the calibration component moves relative to the scanning window following the first transmission component; The second transmission assembly is connected to the first transmission assembly and the calibration assembly, and the second transmission assembly is used to make the calibration assembly rotate following the first transmission assembly.

[0007] In some embodiments, the calibration device further comprises a swing assembly; The swing assembly is connected to the calibration assembly and the second transmission assembly; The second transmission assembly is also used to drive the swing assembly to rotate; When the swing component rotates, it drives the calibration component to swing back and forth.

[0008] In some embodiments, the calibration device further includes a base, a first plate and a second plate, the base is provided with a first side wall, and the first side wall is provided with a swing axis; The first plate is provided with an opening adapted to the swing shaft, and the first plate is penetrated through the opening on the swing shaft; The first plate is connected to the second plate; The second plate is connected to the swing assembly and the calibration assembly, and when the swing assembly rotates, the second plate and the driving assembly are driven to swing back and forth around the swing axis.

[0009] In some embodiments, the swing assembly is a cam mechanism, and the calibration device further includes a limit assembly and an elastic assembly; The elastic component is used to apply an elastic force to the first plate away from the limiting component, so that the cam mechanism remains in contact with the limiting component during the rotation process.

[0010] In some embodiments, the calibration assembly includes a calibration plate, wherein the first plate is provided with an opening; The oral scanner scans the calibration plate on the calibration component through the scanning window and the opening.

[0011] In some embodiments, the second transmission mechanism includes a first transmission wheel, a second transmission wheel and a transmission belt, and the transmission belt is sleeved on the first transmission wheel and the second transmission wheel; The first transmission wheel is connected to the first transmission assembly; The second transmission wheel is connected to the calibration component.

[0012] In some embodiments, the first transmission assembly is a screw rod, and the calibration device further includes a nut matched with the screw rod; The driving assembly is used to drive the lead screw to rotate, and the nut is used to make the lead screw move relative to the scanning window when the lead screw rotates.

[0013] In some embodiments, the first end of the screw rod is inserted into the nut, and the second end of the screw rod is inserted into the first transmission wheel.

[0014] In some embodiments, the driving assembly has a hollow structure, and the lead screw penetrates the hollow structure of the driving assembly and drives the driving assembly to move relative to the scanning window.

[0015] In a second aspect, an embodiment of the present application provides a calibration method for an oral scanner, which is applied to a calibration device for an oral scanner as in the first aspect, and the method comprises: Controlling the driving assembly in the calibration device to drive the first transmission assembly to rotate, so as to drive the calibration assembly to rotate and move relative to the scanning window; The calibration component controls the oral scanner to acquire a set of images each time it rotates a preset angle; At least one set of images acquired by an oral scanner is obtained, and a calibration accuracy of the oral scanner is determined according to the at least one set of images.

[0016] The beneficial effect of the present invention is that the first transmission component is driven by the driving component, so that the calibration component moves and rotates relative to the scanning window under the drive of the first transmission component and the second transmission component, so that the calibration component can have more variable positions in three-dimensional space, which is conducive to obtaining more accurate benchmark parameters of the optical devices inside the oral scanner. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a first stereoscopic view of a calibration device for an oral scanner provided in an embodiment of the present application.

[0018] Figure 2 It is a top view of a calibration device for an oral scanner provided in an embodiment of the present application.

[0019] Figure 3 It is an exploded view of a calibration device for an oral scanner provided in an embodiment of the present application.

[0020] Figure 4 This is a second stereoscopic view of the calibration device for an oral scanner provided in an embodiment of the present application.

[0021] Figure 5 It is a third stereoscopic view of the calibration device for an oral scanner provided in an embodiment of the present application.

[0022] Figure 6 It is an exploded diagram of the calibration module provided in the embodiment of the present application.

[0023] Figure 7 It is a first cross-sectional view of the calibration module provided in an embodiment of the present application.

[0024] Figure 8 It is a second cross-sectional view of the calibration module provided in an embodiment of the present application.

[0025] Fig. 9 It is an exploded view of the calibration component provided in the embodiment of the present application.

[0026] Fig.10 It is a flowchart of a calibration method for an oral scanner provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] See also Figures 1 to 3 , Figure 1 is a first stereogram of a calibration device for an oral scanner provided in an embodiment of the present application, Figure 2 is a top view of a calibration device for an oral scanner provided in an embodiment of the present application, Figure 3 It is an exploded view of a calibration device for an oral scanner provided in an embodiment of the present application.

[0030] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 The calibration device 1 for an oral scanner includes a first base body 100 and a second base body 300 , and a scanning window 101 is formed on the first base body 100 .

[0031] In some embodiments, an oral scanner socket 102 is further provided on the scanning window 101 , and the oral scanner socket 102 is used for inserting the oral scanner.

[0032] In some embodiments, a circuit board 301 can be set on the second base body 300, and the circuit board 301 can communicate with the electronic device and control the driving component 210 according to the instructions issued by the electronic device. Setting the circuit board in the second base body 300 can save space in the calibration module 200.

[0033] In some embodiments, for ease of explanation, the calibration device 1 for an oral scanner in the present application places the second base body 300 horizontally on a placement surface when in use, defines a direction perpendicular to the placement surface and pointing from the second base body 300 to the first base body 100 as a height direction, and defines a direction in a plane parallel to the placement surface as a horizontal direction.

[0034] See also Figure 3 ,like Figure 3As shown, the calibration device 1 for the oral scanner further includes a calibration module 200 , in which a calibration component 240 is disposed. The oral scanner can scan the calibration component 240 in the calibration module 200 for calibration.

[0035] In order to facilitate the understanding of the solution of this application, the subsequent Figures 4 to 9 Both are schematic diagrams after the first base body 100 and the second base body 200 are hidden.

[0036] See also Figure 4 and Figure 5 , Figure 4 is a second stereoscopic diagram of a calibration device for an oral scanner provided in an embodiment of the present application, Figure 5 It is a third stereoscopic view of the calibration device for an oral scanner provided in an embodiment of the present application.

[0037] like Figure 4 and Figure 5 As shown, the calibration module 200 in the calibration device 1 includes: a driving component 210 , a first transmission component 220 , a second transmission component 230 , a calibration component 240 and a scanning window 101 .

[0038] In some embodiments, the scanning window 101 is used for the oral scanner to scan the calibration component 240 .

[0039] In some embodiments, the driving assembly 210 is used to drive the first transmission assembly 220 to rotate and move relative to the scanning window 101 .

[0040] In some embodiments, the calibration component 240 is connected to the first transmission component 220 , and the calibration component 240 moves relative to the scanning window 101 following the first transmission component 220 .

[0041] In some embodiments, the second transmission assembly 230 is connected to the first transmission assembly 220 and the calibration assembly 240 , and the second transmission assembly 230 is used to make the calibration assembly 240 rotate following the first transmission assembly 220 .

[0042] Optionally, the driving component 210 is a motor, such as a stepper motor, a servo motor, etc., which is not limited in the present application.

[0043] Please refer to Figure 6 , Figure 6 It is an exploded diagram of the calibration module provided in the embodiment of the present application.

[0044] like Figures 4 to 6As shown, in some embodiments, the calibration device 1 also includes a swinging assembly 282, and the swinging assembly 282 is connected to the calibration assembly 240 and the second transmission assembly 230. The second transmission assembly 230 is also used to drive the swinging assembly 282 to rotate, and when the swinging assembly 282 rotates, it drives the calibration assembly 240 to swing back and forth.

[0045] In some embodiments, the swing assembly 282 is an eccentric wheel.

[0046] In some embodiments, the swing assembly 282 is a cam plate.

[0047] Alternatively, if Figure 6 As shown, the swing assembly 282 is Figure 6 The cam plate shown in the figure has four protrusions, namely, protrusion A, protrusion B, protrusion C and protrusion D (not shown in the figure) blocked by the limit assembly 290. Figure 6 The middle cam plate takes any raised portion as a starting point, and the calibration component 240 completes one swing every time it rotates 90°.

[0048] Optionally, the present application does not limit the number of protrusions on the cam plate, and the number of protrusions is only used to determine the angle completed by one reciprocating swing.

[0049] See also Figure 7 , Figure 7 It is a first cross-sectional view of the calibration module provided in an embodiment of the present application.

[0050] like Figures 4 to 7 As shown, in some embodiments, the calibration module 200 in the calibration device 1 further includes a base 250 , a first plate 270 and a second plate 260 , the base 250 is provided with a first side wall 252 , and the first side wall 252 is provided with a swing shaft 284 .

[0051] In some embodiments, the first plate 270 is provided with an opening 273 adapted to the swing shaft 284 , and the first plate 270 is penetrated by the swing shaft 284 through the opening 273 .

[0052] In some embodiments, the first plate 270 is connected to the second plate 260 .

[0053] Optionally, the first plate 270 is slidably connected to the second plate 260 via at least one connecting column 286 , and the first plate 270 can move closer to or farther from the second plate 260 by sliding.

[0054] In some embodiments, the second plate 260 is connected to the swing assembly 282 and the calibration assembly 240 , and when the swing assembly 282 rotates, it drives the second plate 260 and the driving assembly 240 to swing back and forth around the swing shaft 284 .

[0055] In some embodiments, if the driving component 210 can follow the first transmission component 220 to move relative to the scanning window 101, the second plate 260 can be fixedly connected to the driving component 210, and the calibration component 240 can be driven to move relative to the scanning window 101 through the second plate 260.

[0056] For example, Figures 4 to 7 As shown, the second plate 260 is fixedly connected to the driving assembly 210, and the second plate 260, the calibration assembly 240, the driving assembly 210, the swing assembly 282 and the second transmission assembly 230 are all fixed to the first transmission assembly 220, and the second plate 260, the calibration assembly 240, the driving assembly 210, the swing assembly 282 and the second transmission assembly 230 move up and down together with the first transmission assembly 220 relative to the scanning window 101.

[0057] Optionally, the second plate 260, the calibration assembly 240, the driving assembly 210, the swing assembly 282 and the second transmission assembly 230 are all fixed to the bottom of the first transmission assembly 220, so that the center of gravity of the calibration device 1 is lower and more stable to use.

[0058] Optionally, the connection column 286 of the second plate 260 passes through the column hole on the first plate 270, and the connection column 286 is slidably connected to the column hole on the first plate 270 along the upward and downward sliding directions.

[0059] Optionally, the calibration device 1 is further provided with at least one elastic column 287, at least one spring is arranged in the elastic column 287, and both ends of the elastic column 287 have a spring hook respectively, the spring hooks respectively hook the extension portion on the first plate 270 and the extension portion on the second plate 260 or the screw head of the screw, etc., because the first transmission assembly 220 is only located on one side of the second plate 260, if only the first transmission assembly 220 is used to provide support force for the second plate 260, the second plate 260 may be tilted, affecting the calibration effect. The elastic column 287 can keep the plane of the second plate 260 horizontal.

[0060] Furthermore, the connection column 286 of the second plate 260 is also used to limit the horizontal displacement of the second plate 260 and the first plate 270 .

[0061] Specifically, when the first transmission assembly 220 moves upward relative to the scanning window 101 , the first transmission assembly 220 approaches the scanning window 101 , and when the first transmission assembly 220 moves downward relative to the scanning window 101 , the first transmission assembly 220 moves away from the scanning window 101 .

[0062] See also Figures 3 to 5 In some embodiments, the swing component 282 is a cam mechanism, and the calibration device also includes a limit component 290 and an elastic component 281.

[0063] In some embodiments, the elastic component 281 is used to apply an elastic force to the first plate 260 away from the limiting component 290, so that the cam mechanism remains in contact with the limiting component 290 during the rotation process.

[0064] In some embodiments, the elastic component 281 includes a spring with a spring hook, which can hook an extension portion on the first plate 270 or a screw head of a screw, etc., to apply an elastic force to the first plate 260 away from the limiting component 290.

[0065] In some embodiments, the limiting assembly 290 includes a roller 291 and a roller mounting plate 292 . The roller mounting plate 292 is provided with a rolling shaft. The roller 291 passes through the rolling shaft and can roll around the rolling shaft.

[0066] Furthermore, the cam mechanism keeps contacting the roller 291 during the rotation process, and the cam mechanism drives the roller 291 to roll around the rolling axis when rotating, thereby reducing the friction between the cam mechanism and the limiting assembly 290 when rotating.

[0067] Optionally, the roller 291 may also be replaced by a material with a low friction coefficient.

[0068] Please refer to Fig. 9 , Fig. 9 It is an exploded view of the calibration component provided in the embodiment of the present application.

[0069] like Fig. 9 As shown, the calibration assembly 240 includes a calibration plate 244 , a light homogenizing plate 243 , a backlight plate 242 , a calibration plate mounting plate 245 and a backlight plate mounting plate 241 , and the calibration device 1 also includes a calibration mounting member 285 .

[0070] Specifically, a specific calibration pattern is printed on the calibration plate 244, and the oral scanner can scan the calibration pattern to perform a calibration operation.

[0071] In some embodiments, the light diffuser 243 is a transparent or semi-transparent structure.

[0072] Optionally, the light diffuser 243 is a plastic light diffuser.

[0073] In some embodiments, the calibration plate 244 is a transparent or translucent structure.

[0074] Optionally, the calibration plate 244 is a glass calibration plate.

[0075] Specifically, the light homogenizing plate 243 is disposed between the calibration plate 244 and the backlight plate 242 , and the light homogenizing plate 243 is used to make the backlight emitted by the backlight plate 242 evenly illuminate the calibration pattern on the calibration plate 244 .

[0076] Specifically, the light homogenizing plate 243 can make the backlight emitted by the backlight plate 242 appear more uniform and soft on the calibration plate 244 , thereby improving the clarity and fidelity of the pattern on the calibration plate 244 .

[0077] In some embodiments, a plurality of light sources are disposed on the backlight panel 242 .

[0078] Exemplarily, a plurality of rows of LED light groups are disposed on the backlight panel 242 , and each row of LED light groups includes a plurality of LED lamps.

[0079] Furthermore, the calibration device 1 in the present application includes a first base body 100 and a second base body 300. Therefore, if there is no backlight panel 242, the image taken by the oral scanner will be blurred due to lack of light during the calibration process. Therefore, the backlight panel 242 is set in the present application to provide a light source in a closed environment.

[0080] In some embodiments, the backlight panel 242 is installed on the backlight panel mounting plate 241, and the calibration plate 244 and the light homogenizing plate 243 are installed on the calibration plate mounting plate 245. After installation, the calibration plate mounting plate 245 and the backlight panel mounting plate 241 form a calibration assembly 240.

[0081] In some embodiments, the calibration component 240 is mounted on the first mounting surface of the calibration mounting member 285, and the first mounting surface and the scanning window 101 have a certain angle, that is, the first mounting surface and the plane where the scanning window is located are not parallel, so that it is easier to distinguish the distance changes, swing changes, and rotation changes of the calibration component 240 during calibration.

[0082] See also Figure 6 , Figure 7 and Fig. 9In some embodiments, the calibration device 1 further includes a conductive slip ring 74, the power cord passes through the conductive slip ring 283 and is arranged on the backlight panel mounting plate 241, one end of the power cord is connected to the backlight panel 242, and the power cord supplies power to the light source in the backlight panel 242. Through the above structure, the power cord on the conductive slip ring 283 rotates synchronously with the calibration component 240, and the power cord will not be worn or even damaged due to the rotation. Even if the calibration component 240 rotates 360 degrees, the power will not be cut off.

[0083] See also Figure 1 , Figure 2 , Figure 6 and Fig. 9 In some embodiments, the calibration component 240 includes a calibration plate 244 , and the first plate 270 is provided with an opening 272 ; the oral scanner scans the calibration plate 244 on the calibration component 240 through the scanning window 101 and the opening 272 .

[0084] Because the calibration component 240 is located between the first plate 270 and the second plate 260 in the height direction in the present application, an opening 272 is provided on the first plate 270 to prevent the scanning path from being blocked and affecting the calibration effect.

[0085] Please refer to Figure 8 , Figure 8 It is a second cross-sectional view of the calibration module provided in an embodiment of the present application.

[0086] See also Figure 6 and Figure 8 In some embodiments, the swing assembly 230 includes a first transmission wheel 231, a second transmission wheel 232 and a transmission belt 233, and the transmission belt 233 is sleeved on the first transmission wheel 231 and the second transmission wheel 232; the first transmission wheel 231 is connected to the first transmission assembly 240; and the second transmission wheel 232 is connected to the calibration assembly 240.

[0087] Optionally, the radius of the first transmission wheel 231 is greater than the radius of the second transmission wheel 232 to prevent the calibration component 240 from rotating too fast and affecting the shooting effect of the oral scanner.

[0088] See also Figure 4 , Figure 5 , Figure 6 and Figure 8 In some embodiments, the first transmission component 220 is a screw, and the calibration device 1 also includes a nut 271 that cooperates with the screw; the driving component 210 is used to drive the screw to rotate, and the nut 271 is used to make the screw move relative to the scanning window 101 when the screw rotates.

[0089] In some embodiments, the nut 271 is fixed to the first plate 270, and the first plate 270 is fixed to the base 250, so that the first plate 270 is stationary relative to the scanning window 101 during the movement of the screw rod, and the nut 271 provides support force for the screw rod, and the components connected to the screw rod, such as the above-mentioned second plate 260, calibration assembly 240, drive assembly 210, swing assembly 282 and second transmission assembly 230.

[0090] Wherein, the combination of the first transmission assembly and the driving assembly is a screw motor.

[0091] In some embodiments, the first end of the screw rod is passed through the nut 271 , and the second end of the screw rod is passed through the first transmission wheel 232 .

[0092] In the above structure, the screw rod can directly drive the first transmission wheel 232 to rotate.

[0093] In some embodiments, the driving assembly 210 has a hollow structure, and the lead screw penetrates the hollow structure of the driving assembly 210 and drives the driving assembly 210 to move relative to the scanning window.

[0094] Optionally, the driving component 210 is a hollow stepping motor, a hollow servo motor, etc.

[0095] Please refer to Fig.10 , Fig.10 4 is a flow chart of a calibration method for an oral scanner provided in an embodiment of the present application. The method is applied to the calibration device in the above embodiment, and the method 400 includes: steps 410 to 430.

[0096] Step 410: Control the driving component in the calibration device to drive the first transmission component to rotate, so as to drive the calibration component to rotate and move relative to the scanning window.

[0097] In some embodiments, when the first transmission component rotates, the calibration component is caused to rotate and move relative to the scanning window.

[0098] Specifically, movement relative to the scanning window refers to moving closer to or farther away from the scanning window in the height direction.

[0099] Step 420: Every time the calibration component rotates a preset angle, the oral scanner is controlled to acquire a set of images.

[0100] In some embodiments, if the calibration device includes a calibration component, each time the calibration component rotates a preset angle, the calibration component can complete exactly one reciprocating swing.

[0101] Exemplarily, the calibration component starts to rotate from the zero position, and the rotation angle corresponding to the zero position is defined as 0°. When the calibration component rotates from 0° to the preset angle, the oral scanner continuously shoots the calibration component to obtain multiple images. The shooting interval can be in time units, for example, shooting once every 0.2S, etc., which is not limited in this application.

[0102] Step 430: Acquire at least one set of images acquired by the oral scanner, and determine the calibration accuracy of the oral scanner according to the at least one set of images.

[0103] In summary, the present application provides a calibration device for an oral scanner, and the calibration device for an oral scanner includes: a driving component, a first transmission component, a second transmission component, a calibration component, and a scanning window; the scanning window is used for the oral scanner to scan the calibration component; the driving component is used to drive the first transmission component to rotate and move relative to the scanning window; the calibration component is connected to the first transmission component, and the calibration component follows the first transmission component to move relative to the scanning window; the second transmission component is connected to the first transmission component and the calibration component, and the second transmission component is used to make the calibration component follow the first transmission component to rotate. The present application drives the first transmission component through the driving component, so that the calibration component moves and rotates relative to the scanning window under the drive of the first transmission component and the second transmission component, so that the calibration component can have more variable positions in three-dimensional space, which is conducive to obtaining more accurate benchmark parameters of the optical device inside the oral scanner.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A calibration device for an oral scanner, characterized in that: The calibration device comprises: a driving component, a first transmission component, a second transmission component, a calibration component and a scanning window; The scanning window is used for the oral scanner to scan the calibration component; The driving assembly is used to drive the first transmission assembly to rotate and move relative to the scanning window; The calibration component is connected to the first transmission component, and the calibration component moves relative to the scanning window following the first transmission component; The second transmission assembly is connected to the first transmission assembly and the calibration assembly, and the second transmission assembly is used to make the calibration assembly rotate following the first transmission assembly.

2. The calibration device according to claim 1, characterized in that: The calibration device also includes a swing assembly; The swing assembly is connected to the calibration assembly and the second transmission assembly; The second transmission assembly is also used to drive the swing assembly to rotate; When the swing component rotates, it drives the calibration component to swing back and forth.

3. The calibration device according to claim 2, characterized in that: The calibration device further comprises a base, a first plate and a second plate, the base is provided with a first side wall, and the first side wall is provided with a swing axis; The first plate is provided with an opening adapted to the swing shaft, and the first plate is penetrated through the opening on the swing shaft; The first plate is connected to the second plate; The second plate is connected to the swing assembly and the calibration assembly, and when the swing assembly rotates, the second plate and the driving assembly are driven to swing back and forth around the swing axis.

4. The calibration device according to claim 3, characterized in that: The swing assembly is a cam mechanism, and the calibration device also includes a limit assembly and an elastic assembly; The elastic component is used to apply an elastic force to the first plate away from the limiting component, so that the cam mechanism remains in contact with the limiting component during the rotation process.

5. The calibration device according to claim 3, characterized in that: The calibration assembly comprises a calibration plate, wherein the first plate is provided with an opening; The oral scanner scans the calibration plate on the calibration component through the scanning window and the opening.

6. The calibration device according to claim 2, characterized in that: The second transmission mechanism comprises a first transmission wheel, a second transmission wheel and a transmission belt, wherein the transmission belt is sleeved on the first transmission wheel and the second transmission wheel; The first transmission wheel is connected to the first transmission assembly; The second transmission wheel is connected to the calibration component.

7. The calibration device according to claim 6, characterized in that: The first transmission component is a screw rod, and the calibration device also includes a nut matched with the screw rod; The driving assembly is used to drive the lead screw to rotate, and the nut is used to make the lead screw move relative to the scanning window when the lead screw rotates.

8. The calibration device according to claim 7, characterized in that: The first end of the screw rod is inserted into the nut, and the second end of the screw rod is inserted into the first transmission wheel.

9. The calibration device according to claim 8, characterized in that: The driving component has a hollow structure, and the lead screw penetrates the hollow structure of the driving component and drives the driving component to move relative to the scanning window.

10. A calibration method for an oral scanner, characterized in that: Applied to the calibration device for an oral scanner as claimed in any one of claims 1 to 9, the method comprising: Controlling the driving assembly in the calibration device to drive the first transmission assembly to rotate, so as to drive the calibration assembly to rotate and move relative to the scanning window; The calibration component controls the oral scanner to acquire a set of images each time it rotates a preset angle; At least one set of images acquired by an oral scanner is obtained, and a calibration accuracy of the oral scanner is determined according to the at least one set of images.

Images