KR20220118690A - Calibration device for oral scanner - Google Patents

Abstract

One embodiment of the present invention provides a calibration device for an oral scanner, which comprises: a casing which has an open upper part coupled to an oral scanner body; a rotation unit which is provided to be rotatable around the casing; a reflector unit which is disposed on the central axis of an optical device of the oral scanner body, and includes a plurality of reflectors; and a pattern plate unit which faces the optical device through the reflectors. In conjunction with the rotation of the rotation unit, the pattern plate unit rotates in place and the reflector unit rectilinearly reciprocates with respect to the oral scanner body.

Description

CALIBRATION DEVICE FOR ORAL SCANNER

The present invention relates to a calibration device for an intraoral scanner, and more particularly, to a device for calibrating an intraoral scanner using a pattern plate, etc. to improve the accuracy of the intraoral scanner.

Impression taking in the dental prosthesis manufacturing process is an important process in manufacturing an accurate prosthesis. Conventionally, impressions were taken using an impression material, and then the prosthesis was manufactured based on the produced plaster model. However, deformation of the impression material and the use of plaster There was a disadvantage that there was an error according to it.

Accordingly, an optical 3D scanner is used to measure oral structures such as teeth or gums using an optical 3D camera, and dental prostheses are being manufactured using a CAD/CAM system. In particular, recently, images obtained from two or more cameras A stereo vision method using

In the stereo vision method, three-dimensional distance information is obtained based on two image data having a single point in the oral cavity as the same focus. In order to obtain accurate three-dimensional model data, calibration is often required for the oral scanner. For this reason, it is common for a three-dimensional intraoral scanner to provide a calibration tool as a separate accessory in the form of a cradle.

On the other hand, during calibration, acquiring the image of the pattern plate from various angles helps to improve the accuracy of the calibration, but in the calibration cradle disclosed in Korean Patent No. 10-2129383, the pattern plate is rotated in eight steps by 90 degrees in the circumferential direction. It rotates over and is configured to reciprocate in a straight line in conjunction with it, so there is a disadvantage that it is not possible to acquire an image of the pattern plate other than a predetermined angle and depth.

Republic of Korea Patent Registration No. 10-2129383 (published on July 02, 2020)

The present invention is to solve the problems of the prior art described above, an object of the present invention is to provide a calibration device for an intraoral scanner that has a simple structure, and can acquire an image of a pattern plate at various angles and depths.

One aspect of the present invention is a casing in which the oral scanner body is coupled to the open upper part; a rotating part provided to be rotatable with respect to the casing; It is disposed on the central axis of the optical device of the intraoral scanner body, a reflector comprising a plurality of reflectors; and a pattern plate unit facing the optical device through the reflector. Including, in conjunction with the rotation of the rotating part, the pattern plate portion rotates in place and the reflector provides a calibration device for the oral scanner that moves in a straight line with respect to the oral scanner body.

In one embodiment, the rotating part, a rotating shaft extending in the longitudinal direction; a first coupling part provided on one side of the rotary shaft and coupled to the pattern plate part; and a second coupling part provided on the other side of the rotating shaft and coupled to the reflecting mirror part; It is characterized in that it includes.

In one embodiment, one end of the rotary shaft is characterized in that the handle is provided.

In one embodiment, the pattern plate portion, a pattern plate; and a rotating part integrally formed with the pattern plate and engaged with the first coupling part; Including, the rotating part is characterized in that it is rotated by the rotation of the first coupling part.

In one embodiment, the reflective mirror unit, a plurality of reflective mirrors; and a support part that supports the reflector and engages the second coupling part; Including, wherein the support portion is characterized in that the linear reciprocating movement by the rotation of the second coupling portion.

In one embodiment, the reflector is characterized in that it is arranged to reflect the direction of the light irradiated from the optical device 180 degrees.

In one embodiment, the reflecting mirror is composed of a first reflecting mirror and a second reflecting mirror, the first reflecting mirror is disposed to form an angle of 45 degrees on the central axis of the optical device, the second reflecting mirror is the length of the pattern plate portion It is arranged to form an angle of 45 degrees on the direction axis, and the first and second reflectors are characterized in that they are arranged to form mirror symmetry.

In one embodiment, the reflector portion is a guide portion coupled to the rail formed in the casing; It is characterized in that it further comprises.

In one embodiment, when the second coupling part is rotated, the reflecting mirror part is characterized in that it linearly reciprocates along the rail.

In one embodiment, at least one of the one end and the other end of the rail is characterized in that a stepped portion for limiting the movement of the reflector is formed.

According to one aspect of the present invention, the pattern plate is rotated in association with the rotation of the rotating part, and the reflector is linearly reciprocated with respect to the oral scanner body, the image of the pattern plate can be obtained at various angles and depths, and thus, calibration accuracy can be improved.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a perspective view of a calibration device for an intraoral scanner according to an embodiment of the present invention.
Figure 2 is a perspective view of the inner space of the calibration device for the intraoral scanner.
3 is an exploded perspective view of FIG. 1 ;
4 and 5 are cross-sectional views showing the operation process of the intraoral scanner calibration device according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in several different forms, and thus is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is "connected" with another part, this includes not only the case of being "directly connected" but also the case of being "indirectly connected" with another member interposed therebetween. . In addition, when a part "includes" a certain component, this means that other components may be further provided without excluding other components unless otherwise stated.

As used herein, terms including an ordinal number such as 'first' or 'second' may be used to describe various elements or steps, but the elements or steps should not be limited by the ordinal number. . Terms containing an ordinal number should only be construed for the purpose of distinguishing one element or step from other elements or steps.

1 is a perspective view of a calibration device for an intraoral scanner according to an embodiment of the present invention. Figure 2 is a perspective view of the inner space of the calibration device for the intraoral scanner. 3 is an exploded perspective view of FIG. 1 ; 4 and 5 are cross-sectional views showing the operation process of the intraoral scanner calibration device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, the calibration device 1000 for an intraoral scanner according to an embodiment of the present invention is a device for calibrating the optical device of the intraoral scanner, the casing 100, the rotating unit 200, the pattern It includes a plate part 300 and a reflector part 400 .

The casing 100 is to form the outer peripheral surface of the calibration device 1000 for the intraoral scanner, the body 110 forming an inner space, is formed on one upper side of the body 110, and the oral scanner body 1 is inserted It includes first and second covers 130 and 140 configured to cover both sides of the supported insertion portion 120 and the body 110 . In general, the intraoral scanner consists of an intraoral scanner body (1) on which an optical device and an imaging board are disposed and a probe tip having a reflective mirror disposed therein, and the optical device irradiates light toward the opening of the intraoral scanner body (1) It consists of a light source and a pair of imaging devices for condensing the light entering through the opening onto the imaging board.

At this time, the probe tip is inserted into the oral cavity of the subject and scanning of the patient's oral cavity is performed, and the reflective member may be filled with moisture in the patient's oral cavity. have. Therefore, in order to minimize the negative effect of the reflective member, it is preferable that only the intraoral scanner body 1 from which the probe tip is removed is inserted into the casing 100 .

Preferably, so that the intraoral scanner body (1) can be fixed to the insertion unit 120, the insertion unit 120 may be formed to correspond to the end shape of the intraoral scanner body (1). More preferably, a groove formed along the circumferential direction is formed at the end of the intraoral scanner body 1, and a protrusion corresponding to the groove may be formed around the inner circumferential surface of the insertion unit 120. In this case, when the intraoral scanner body 1 is inserted into the insertion unit 120 , the groove and the protrusion are coupled to the intraoral scanner body 1 to be firmly fixed to the insertion unit 120 .

The body 110 may have a trapezoidal shape with a space formed therein as shown in FIG. 2 , but is not limited thereto, and various shapes may be applied. The light emitted from the light source of the oral scanner body 1 is irradiated to the reflector 400 disposed inside the body 110 to be described later.

On the other hand, the pattern plate portion 300 according to an embodiment of the present invention is provided inside the body 110 so that its longitudinal axis is located on an axis parallel to the central axis of the oral scanner body (1). Accordingly, the pattern plate unit 300 faces the optical device inside the intraoral scanner body 1 through a reflector unit 400 to be described later, which includes a pattern plate 310 and a seating unit 320 .

In detail, the pattern plate 310 may be formed in a square shape, and various patterns may be formed. For example, the pattern may be formed such that the contrast between the grid and the grid adjacent to the top and bottom and left and right in the grid pattern are clearly distinguished.

The pattern plate 310 is seated on the mounting portion 320 . At this time, the inclination angle of the pattern plate 310 is preferably set to be 40 degrees or more and less than 50 degrees based on the incident light reflected through the reflector. When the pattern plate 310 is disposed to be orthogonal to the incident light, each pattern formed on the pattern plate 310 has a disadvantage in having the same depth information (or height information) on the same surface, the pattern plate 310 It is designed to increase the calibration effect by arranging at an angle with respect to the incident light. To this end, the upper surface of the seating portion 320 on which the pattern plate 310 is seated is preferably formed as an inclined surface having an inclination angle of 40 degrees or more and less than 50 degrees with respect to the longitudinal direction thereof.

The seating part 320 includes an extension part 321 formed to extend in the longitudinal direction together with the above-described inclined surface, and the extension part 321 is rotatable on the mounting part 240 of the rotating part 200 to be described later. supported to do More preferably, a support 141 supporting the seating part 320 is extended on the inner surface of the second cover 140 so that the seating part 320 may be supported by the support 141 .

The pattern plate part 300 further includes a rotation part 330 integrally formed with the extension part 321 formed at the lower end of the seating part 320 so as to rotate in association with the rotation of the rotation part 200 to be described later. The rotating part 330 is preferably formed in the shape of a spur gear as shown, but is not limited thereto, and various gears may be applied, of course.

On the other hand, as described above, the pattern plate 310 is positioned on an axis parallel to the central axis of the oral scanner body 1, in order for the light irradiated from the optical device to be incident on the pattern plate 310 through a reflector. It should reflect 180 degrees.

To this end, the reflector 400 according to an embodiment of the present invention includes a plurality of reflectors and the reflectors for reflecting the light irradiated from the optical device of the oral scanner body 1 to the above-described pattern plate 310 side, and the reflector is an intraoral scanner. It consists of a support part 420 that supports to be inclined with respect to the main body (1).

Specifically, the first reflector 410 is disposed at an angle of 45 degrees on the central axis of the intraoral scanner body 1, and the second reflector 420 is at an angle of 45 degrees on the longitudinal axis of the pattern plate unit 300. are placed That is, the first reflecting mirror 410 and the second reflecting mirror 420 are mirror-symmetrical with respect to a plane located at the center of the central axis of the oral scanner body 1 and the longitudinal axis of the pattern plate part 300 . In this case, the light irradiated from the optical device is reflected 180 degrees through the first reflecting mirror 410 and the second reflecting mirror 420 , and is incident on the pattern plate 310 provided above the second reflecting mirror 420 . The reflector may be formed of a mirror having a rectangular shape, but is not limited thereto, and mirrors of various shapes may be applied.

The support part 420 includes a rectangular parallelepiped body and a fixing part extending from the body to support the first and second reflectors 410 and 420 at an angle.

In addition, the reflector unit 400 further includes a guide unit 422 to linearly reciprocate in association with the rotation of the rotating unit 200 to be described later. In detail, as will be described later, the inner surface of the second cover 140 so that the reflector 400 can move linearly and reciprocally with respect to the oral scanner body 1 by the rotational force according to the rotation of the rotating unit 200. A rail 142 extending in a direction parallel to the central axis of the intraoral scanner body 1 is formed, and the guide part 422 is at the lower end of one side of the support part 420 so as to surround the rail 142 described above. It is formed in a C-shape.

Preferably, at least one of the one end and the other end of the rail 142 may be formed with a stepped portion limiting the linear movement of the reflective mirror portion 400 .

In this way, when the guide part 422 is coupled to the rail 142 , as will be described later, when the rotation part 200 rotates, the reflector part 400 is prevented from rotating as well as the guide part 422 . You can guide the direction of movement.

Preferably, a through hole to which the rotating part 200 to be described later is coupled is formed in the support portion 420 , and a thread 421 is formed on an inner circumferential surface of the through hole.

On the other hand, as described above, in the intraoral scanner of the stereo vision method, three-dimensional distance information is obtained based on two image data having one point of the mouth as the same focus. This is often required. At this time, if the image of the pattern plate 310 is acquired at various angles and depths, the accuracy of calibration may be improved.

To this end, the calibration apparatus 1000 for an intraoral scanner according to an embodiment of the present invention further includes a rotating unit 200 that rotates in conjunction with the above-described pattern plate unit 300 and the reflector unit 400 .

The rotating part 200 is provided on one side of the inner circumferential surface of the body 110 , and includes a rotating shaft 210 , a first coupling part 220 , and a second coupling part 230 . The rotating shaft 210 extends in a direction parallel to the central axis of the oral scanner body 1, and a first coupling part 220 engaged with the pattern plate part 300 is provided on one side thereof.

In detail, the first coupling part 220 having a spur gear shape is disposed on one side of the rotation shaft 210 , which is engaged with the rotation part 330 of the pattern plate part 300 described above. Accordingly, when the rotating shaft 210 is rotated, the rotating part 330 engaged with the first coupling part 220 is rotated, and the pattern plate part 300 is rotated about the longitudinal axis.

Preferably, when the rotation shaft 210 rotates 360 degrees, the pattern plate part 300 may be rotated 90 degrees, but is not limited thereto.

Preferably, the other side of the rotating shaft 210 may extend outside the body 110 through the body 110, and at the end thereof, a handle for allowing the user to easily rotate the rotating shaft 210 ( 211) may be formed. However, it is not limited to being manually rotated by the user as described above, and may be automatically rotated by a motor or the like.

Preferably, as shown in FIG. 3 , mounting portions 240 and 241 for rotatably supporting both sides of the rotary shaft 210 may be provided on the inner surface of the cover, and at this time, the pattern plate portion 300 ) side mounting part 240, it is preferable to support the axis of the seating part 320 of the pattern plate part 300 as well as the rotation shaft 210 together. More preferably, a bearing for smooth rotation of the rotating shaft 210 and the pattern plate unit 300 may be provided at the center of the mounting portions 240 and 241 .

A second coupling part 230 in the shape of a screw thread is formed on the other side of the rotating shaft 210 . In addition, the second coupling part 230 is coupled to the through hole of the support part 420 of the above-described reflector part 400 . In detail, a thread 421 corresponding to the second coupling part 230 is formed on the inner circumferential surface of the through hole, and the rotating shaft 210 and the reflecting mirror 400 are rotatably coupled to each other.

At this time, when the rotary shaft 210 is rotated about its longitudinal axis, the rotational force applied to the rotary shaft 210 by the frictional force between the threads 421 is applied to the support portion 420 of the reflector 400 or , As described above, since the guide portion 422 formed on the support portion 420 is coupled to the rail 142 formed on the cover of the casing 100 , the rotation of the support portion 420 is limited.

Accordingly, the support 420 is linearly reciprocated along the longitudinal direction of the rail 142, and the reflectors supported by the support 420 and the support 420 are based on the central axis of the intraoral scanner body (1). will be round-trip.

Preferably, when the rotating shaft 210 rotates 360 degrees, the reflector 400 may linearly reciprocate by 0.5 mm, but is not limited thereto.

In this way, in conjunction with the rotation of the rotating unit 200, the pattern plate 310 is rotated, the position of the reflector with respect to the intraoral scanner body 1 is changed, the image of the pattern plate 310 during calibration at various angles and depth, thereby improving the accuracy of calibration.

Hereinafter, the operation process of the intraoral scanner calibration apparatus 1000 according to an embodiment of the present invention will be described in detail.

When a user holds and rotates the handle 211 provided on the outside of the body 110 of the casing 100 , the rotating shaft 210 integrally formed with the handle 211 is rotated. When the rotating part 330 engaged with the first coupling part 220 disposed on one side of the rotating shaft 210 is rotated by the rotation of the rotating shaft 210, the pattern plate unit 300 is rotated about its longitudinal axis. will rotate to At the same time, a rotational force is applied to the reflector part 400 screwed to the other side of the rotating shaft 210 , but the guide part 422 of the reflector part 400 is coupled to the rail 142 formed on the cover of the casing 100 . rotation is limited, and thus the rail 142 moves linearly and reciprocally. That is, the reflector 400 is moved in a straight line with respect to the oral scanner body (1).

In this way, the pattern plate 310 is rotated in conjunction with the rotation of the rotating unit 200, and the reflector is linearly reciprocated with respect to the oral scanner body 1, the image of the pattern plate 310 at various angles and depths. can be obtained, and thus the accuracy of calibration can be improved.

The foregoing description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and likewise components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

1 Intraoral scanner body
Calibration device for 1000 intraoral scanners
100 casing
110 body
120 insert
130 first cover
140 second cover
141 support
142 rail
200 turns
210 rotary shaft
211 handle
220 first coupling part
230 second coupling part
240, 241 mount
300 pattern plate
310 pattern plate
320 seat
321 extension
330 turn
400 reflector
410 first reflector
411 second reflector
420 support
421 thread
422 guide

Claims (10)

A casing in which the oral scanner body is coupled to the open upper part;
a rotating part provided to be rotatable with respect to the casing;
It is disposed on the central axis of the optical device of the intraoral scanner body, a reflector comprising a plurality of reflectors; and
a pattern plate unit facing the optical device through the reflector; including,
In conjunction with the rotation of the rotating unit, the pattern plate portion rotates in place and the reflector unit linearly reciprocates with respect to the oral scanner body, a calibration device for an intraoral scanner. The method of claim 1,
The rotating part,
a rotary shaft extending in the longitudinal direction;
a first coupling part provided on one side of the rotary shaft and coupled to the pattern plate part; and
a second coupling part provided on the other side of the rotating shaft and coupled to the reflecting mirror part; It characterized in that it comprises a, a calibration device for the intraoral scanner. 3. The method of claim 2,
One end of the rotating shaft, characterized in that the handle is provided, the intraoral scanner calibration device. 3. The method of claim 2,
The pattern plate portion,
pattern plate; and
a rotating part integrally formed with the pattern plate and engaged with the first coupling part; including,
The rotation unit, characterized in that rotated by the rotation of the first coupling unit, a calibration device for an intraoral scanner. 5. The method according to any one of claims 2 to 4,
The reflector unit,
a plurality of reflectors; and
a support part that supports the reflector and engages the second coupling part; including,
The support portion is characterized in that the linear reciprocating movement by the rotation of the second coupling portion, a calibration device for an intraoral scanner. 6. The method of claim 5,
The reflector is characterized in that arranged to reflect the direction of the light irradiated from the optical device 180 degrees, the intraoral scanner calibration device. 7. The method of claim 6,
The reflector is composed of a first reflector and a second reflector,
The first reflector is disposed to form a 45 degree angle on the central axis of the optical device,
The second reflector is disposed to form an angle of 45 degrees on the longitudinal axis of the pattern plate portion,
The first reflector and the second reflector are characterized in that arranged to form a mirror symmetry, a calibration device for an intraoral scanner. 6. The method of claim 5,
The reflector portion includes a guide portion coupled to the rail formed in the casing; A calibration device for an intraoral scanner, characterized in that it further comprises. 9. The method of claim 8,
When the second coupling portion is rotated, the reflector portion is characterized in that the linear reciprocating movement along the rail, an intraoral scanner calibration device. 10. The method of claim 9,
At least one of the one end and the other end of the rail is characterized in that a stepped portion for limiting the movement of the reflector is formed, a calibration device for an intraoral scanner.

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