WO2022030737A1

WO2022030737A1 - Three-dimensional oral scanner

Info

Publication number: WO2022030737A1
Application number: PCT/KR2021/006826
Authority: WO
Inventors: 김은중
Original assignee: 오스템임플란트 주식회사
Priority date: 2020-08-03
Filing date: 2021-06-01
Publication date: 2022-02-10
Also published as: KR20220016643A; KR102465219B1

Abstract

An embodiment of the present invention provides a three-dimensional oral scanner comprising: a housing having an opening formed at one end thereof; an optical device comprising a light source for emitting light toward the opening, and a pair of lenses which are spaced apart from each other while the light source is located at the center between the lenses and through which the light introduced to the opening passes; a pair of image boards each of which has an image sensor disposed on the upper surface thereof and receives the light having passed through the lenses; and a ball joint device for adjusting an optic axis of the lenses, wherein the lenses, the image board, and the ball joint device are integrally coupled.

Description

3D Oral Scanner

The present invention relates to a three-dimensional intraoral scanner, and more particularly, to a three-dimensional intraoral scanner of a stereo vision method.

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

On the other hand, in the stereo vision method, three-dimensional distance information is obtained based on two image data with one point of the mouth as the same focus. As a result, the performance of the scanner may be degraded.

However, since the optical devices used in the intraoral scanner have a small angle of view compared to the object distance, the optical axis is shifted even if a small processing and assembly tolerance occurs, so there is a problem in that it is practically difficult to adjust the optical axis only by simple assembly.

The present invention is to solve the problems of the prior art described above, an object of the present invention is to provide a three-dimensional intraoral scanner easy to align the optical axis of the optical device.

In order to achieve the above object, one aspect of the present invention is a housing having an opening formed at one end; an optical device including a light source irradiating light toward the opening and a pair of lenses spaced apart from the light source and through which light flowing into the opening passes; a pair of image boards on which an image sensor for receiving light passing through the lens is disposed; and a ball joint device for adjusting the optical axis of the lens. Including, the lens, the image board and the ball joint device are integrally coupled, it provides a three-dimensional intraoral scanner.

In one embodiment, the lens is seated on a hollow lens support coupled to one side of the image board, the ball joint device is coupled to the other side of the image board, it may be a three-dimensional intraoral scanner.

In an embodiment, it is disposed between the lens and the image sensor and further comprises a pair of optical path changing units for changing a path of light passing through the lens, the lens, the image board, the optical path changing unit and the The ball joint device may be an integrally coupled, three-dimensional intraoral scanner.

In one embodiment, the lens is seated on a hollow lens support unit coupled to the front end of one side of the image board, the ball joint device is coupled to the rear end of one side of the image board, a three-dimensional intraoral scanner can be have.

In one embodiment, the ball joint device comprises: a joint socket portion in which a joint groove portion is formed; a ball stud portion in which a joint ball portion is formed so as to be rotatably coupled to the joint groove portion; And it may be a three-dimensional intraoral scanner comprising a ball stud support for supporting the ball stud.

In one embodiment, the image board, the hollow-shaped lens support on which the lens is seated is coupled and the ball stud support is coupled, it may be a three-dimensional intraoral scanner.

In one embodiment, the joint ball portion is made of a spherical shape, the joint groove portion made of a spherical groove corresponding to the joint ball portion, may be a three-dimensional intraoral scanner.

In one embodiment, the grease is accommodated between the joint groove portion and the joint ball portion, it may be a three-dimensional intraoral scanner.

In one embodiment, the ball joint device may be a three-dimensional intraoral scanner that adjusts the optical axis of the lens and the light source.

In one embodiment, the housing may be a three-dimensional intraoral scanner provided with a manipulation unit capable of manipulating the ball joint device.

In one embodiment, the housing may be a three-dimensional intraoral scanner provided with a fixing unit for limiting the movement of the ball joint device.

According to one aspect of the present invention, it is possible to easily align the optical axes of the optical devices, thereby improving the performance and uniformly maintaining the quality of the product.

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 three-dimensional intraoral scanner according to a first embodiment of the present invention.

2 is a perspective view showing an optical path according to the optical device according to the first embodiment of the present invention.

3 is a plan view and a cross-sectional view taken along the line A-AA of the lens, image board, and ball joint device according to the first embodiment of the present invention.

4 is a perspective view of a three-dimensional intraoral scanner according to a second embodiment of the present invention.

5 is a perspective view illustrating an optical path according to an optical device according to a second embodiment of the present invention.

6 is a plan view and a cross-sectional view of a lens, an image board, and a ball joint device according to a second 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 where it is "directly connected" but also the case where it is "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.

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

In detail, the three-dimensional intraoral scanner 100 according to the first embodiment of the present invention, as shown in FIGS. 1 and 2 , a housing 10 comprising a probe tip 12 and a body part 11 . ) is included.

The probe tip 12 is formed so that its rear end is coupled to the front of the main body 11 and the front end is inserted into the oral cavity of the subject. An opening is formed at the front end of the probe tip 12 toward the examinee's teeth, and a reflector 13 is inclined inside the opening. The reflector 13 reflects the light emitted from the light source 22, which will be described later, and sends it out through the opening, and reflects the reflected light back to the oral structure such as teeth toward the body 11 with the lens 21 again. make it The optical device 20 and the image board 30 are disposed inside the main body 11 . The optical device 20 includes a light source 22 for irradiating light toward the opening and a pair of lenses 21 for transmitting light introduced through the opening. Preferably, the light source 22 may be a beam projector.

In the case of three-dimensional data measurement using the stereo vision method, at least two or more lenses 21 are required, and the lenses 21 must look at the measurement object from different positions, and the lens 21 is the housing 10 It is preferable to be inclined at the same angle toward the opening while being spaced apart from the light source 22 disposed at the center of the .

In detail, the light irradiated from the light source 22 sequentially passes through the main body 11 and the probe tip 12 and is reflected by the reflector 13 toward the opening, and is irradiated into the oral cavity of the patient. Then, the patient's oral image is reflected from the reflector 13, passes through the probe tip 12 and the body portion 11, and passes through a pair of lenses 21 inclined toward the center of the reflector 13, the lens It is accommodated in the image sensor 31 disposed at one end of the 21 .

Accordingly, two pieces of image data can be simultaneously obtained for one point, and when the image data is processed by a stereo vision system, three-dimensional distance information can be obtained.

Meanwhile, as described above, the light passing through each lens 21 is received by the image sensor 31 provided in the image board 30 . In detail, when light is received by the image sensor 31 , it may be converted into image data, but when the optical axis of the lens 21 and the optical center of the image sensor 31 do not match, an error may occur.

Accordingly, in the three-dimensional intraoral scanner 100 according to the first embodiment of the present invention, the image sensor 31 to the lens 21 so that the optical axis of the lens 21 and the image sensor 31 can be more easily aligned. ) is disposed perpendicular to the longitudinal direction of the lens at the lower part of one end.

To this end, it is preferable to couple the lens 21 and the image sensor 31 disposed on the front surface of the image board 30 through the hollow lens support 50 . In detail, one end of the lens support part 50 is made of a hollow square shape corresponding to the shape of the image sensor 31 , and the other end of the lens support part 50 has a circular shape so that a cylindrical lens can be seated. It may be made of a hollow, but is not limited thereto.

In this way, when the lens 21 , the lens support part 50 , and the image sensor 31 are disposed, the optical axis centers of the lens 21 and the image sensor 31 may be easily aligned.

On the other hand, as described above, since the optical devices used in the intraoral scanner have a small angle of view compared to the object distance, the optical axis is shifted even if a slight processing and assembly tolerance occurs. There are limits to that.

Accordingly, in the present invention, the three-dimensional intraoral scanner 100 includes a ball joint device 40 to adjust the optical axis of the optical device 20 when assembling, and the ball joint device 40 is a pair of lenses 21 and a light source 22 .

In detail, as shown in FIG. 3 , the ball joint device 40 according to the first embodiment of the present invention includes a joint socket part 41 , a ball stud part 43 and a ball stud part support part 45 . include

A joint groove portion 42 is formed inside the joint socket portion 41 , and the joint groove portion 42 is composed of a spherical groove corresponding to the spherical joint ball portion 44 . The joint socket part 41 may be supported inside the body part 11 .

A joint ball part 44 is formed at one end of the ball stud part 43 to be rotatably coupled to the joint groove part 42 . The joint ball part 44 is formed in a spherical shape to be rotatable in the joint groove part 42 . Grease may be accommodated between the joint groove part 42 and the joint ball part 44 .

At the other end of the ball stud part 43, a ball stud part support part 45 for supporting the ball stud part 43 is formed, and preferably, the ball stud part 43 and the ball stud part support part 45 are integrally formed. can be formed.

Preferably, the above-described ball joint device 40 may also be coupled to the light source 22 .

On the other hand, in the conventional intraoral scanner, the image board and the lens are not formed integrally, when the angle and position of the lens are slightly adjusted so that the optical axis of the lens faces the center of the reflector of the opening, the optical axis of the lens and the image sensor There was a problem that this could go wrong.

Accordingly, in the present invention, the ball joint device 40 is integrally coupled to the image board 30 and the lens 21 .

In detail, the ball stud support part 45 is coupled to the image board 30 while supporting the ball stud part 43 . The ball stud support part 45 includes a base surface on which the ball stud part 43 is disposed and pillars supporting the base surface, and the pillars may be coupled to the rear surface of the image board 30 .

Accordingly, the joint ball part 44 , the ball stud part 43 , the ball stud part support part 45 , the image board 30 , the image sensor 31 , the lens support part 50 and the lens 21 are integrally formed. Thus, when the joint ball part 44 rotates in the joint groove part 42 , the lens 21 and the image sensor 31 also rotate in conjunction therewith.

That is, even when the ball joint device 40 is adjusted to adjust the optical axis of the optical device 20, the lens 21 and the image sensor 31 move in the same way as the optical device, so the pre-aligned lens 21 The optical axis of , and the optical center of the image sensor 31 do not deviate.

On the other hand, Figure 4 is a perspective view of a three-dimensional intraoral scanner according to a second embodiment of the present invention, Figure 5 is a perspective view showing an optical path according to the optical device according to the second embodiment of the present invention.

4 and 5 are for a three-dimensional intraoral scanner according to the second embodiment of the present invention, detailed description of the above-described configuration will be omitted.

As described above, in the case of three-dimensional data measurement using the stereo vision method, two or more lenses 21' should look at the measurement object from different positions. Accordingly, even in the second embodiment, the light source 22' is disposed at the center of the main body 11' and irradiates light toward the opening, while the lens 21' is spaced apart from the light source 22'. Although inclined at the same angle toward the opening, there is a difference from the first embodiment in the arrangement of the pair of lenses 21' and the image board 30' and the shape of the ball joint device 40'.

Specifically, the three-dimensional intraoral scanner 100' according to the second embodiment of the present invention, the image board 31' is a reflector ( 13') is positioned to face.

In detail, in order to efficiently utilize the space inside the intraoral scanner, the image board 30' formed to extend in the longitudinal direction is disposed on one side of the housing 10', and the lens 21' is passed through. An optical path changing unit 60 capable of changing the optical path of light toward the image sensor 31 ′ may be disposed between the lens 21 ′ and the image sensor 31 ′.

The optical path changing part 60 is disposed inside the hollow lens support part 50 ′ coupled to the image board 30 ′. The lens support 50' is disposed at the front end of the upper surface of the image board 30', and its hollow is configured to communicate the lens 21' and the image sensor 31'.

As shown in FIG. 5 , the lens support 50 ′ of the present invention may have a “L”-shaped hollow, but is not limited thereto, and may communicate with the lens 21 ′ and the image sensor 31 ′. If possible, it may be composed of hollows of other shapes.

The light path change unit 60 is inclinedly disposed inside the hollow of the lens support unit 50', and may refract light guided along the longitudinal direction of the housing 10' toward the center of the image sensor 31'. .

Accordingly, the light irradiated from the light source 22' sequentially passes through the body portion 11' and the probe tip 12', is reflected by the reflector 13', and is directed toward the opening, and is irradiated into the oral cavity of the patient. Then, the patient's oral image is reflected from the reflector 13', passes through the probe tip 12' and the main body 11', and a pair of lenses 21' inclined toward the center of the reflector 13'. It may pass through, be refracted by the optical path change unit 60 and be accommodated in the image sensor 31 ′.

Meanwhile, the optical path changing unit 60 may include a total reflection mirror capable of total reflection of light. However, it is not necessarily limited to a total reflection mirror, and may include other optical elements capable of total reflection.

Meanwhile, FIG. 6 is a plan view and a cross-sectional view of a lens, an image board, and a ball joint device according to a second embodiment of the present invention, and a detailed description of the above-described configuration will be omitted.

The ball stud support part 45' of the second embodiment of the present invention is coupled to the rear end of the upper surface of the image board 30'. In detail, the ball stud part 43' is coupled to one end of the ball stud part support part 45', and the bottom surface of the ball stud part support part 45' is coupled to the rear end of the upper surface of the image board 30'. .

Accordingly, the joint ball part 44', the ball stud part 43', the ball stud part support part 45', the image board 30', the image sensor 31', the lens support part 50', the optical path change part 60 and the lens 21' are integrally formed, and when the joint ball part 44' rotates in the joint groove part 42', the lens 21', the image sensor 31', and the optical path changing part ( 60) also rotates in conjunction with it.

That is, even if the ball joint device 40' is adjusted to adjust the optical axis of the optical device 20', the lens 21', the image sensor 31', and the optical path changing unit 60 also rotate in the same way, The optical axis of the lens 21' aligned in advance and the optical center of the image sensor 31' do not deviate.

On the other hand, although not shown in the drawings, in the housing (10, 10') of the present invention, a manipulation unit for rotating the ball joint device (40, 40') may be provided on the main body (11, 11'), , a fixing unit for limiting the movement of the ball joint devices 40 and 40' after the optical axes of the optical devices 20 and 20' are aligned may also be included.

When assembling the three-dimensional intraoral scanner 100, 100' according to the first and second embodiments of the present invention, first, the optical axis of the lenses 21 and 21' is at the center of the image sensor 31, 31'. The lenses 21 and 21' are seated on the lens supports 50 and 50' to be positioned. Thereafter, the ball joint devices 40 and 40' are coupled to the rear or front surfaces of the image boards 30 and 30'. Next, the assembly of the lenses 21 and 21', the image boards 30 and 30', and the ball joint devices 40 and 40', and the light sources 22 and 22' are disposed in one side of the

body parts

11 and 11'. and reflective mirrors 13 and 13' are disposed on one end of one end of the probe tips 12 and 12' to be inclined. Then, by rotating the joint ball parts 44 and 44' located inside the joint socket parts 41 and 41', the optical axes of the lenses 21 and 21' and the light sources 22 and 22' are reflected by the reflectors 13 and 13'. Adjust to face the center of After the optical axes are aligned, the joint socket parts 41 and 41' surrounding the joint ball parts 44 and 44' are strongly fastened so that the lenses 21 and 21' and the image boards 30 and 30' do not move. And, the body part (11, 11') and the probe tip (12, 12') the other side, respectively, the body part (11, 11') and the probe tip (12, 12') coupled to one side of the three-dimensional intraoral scanner 100, 100') close the inside.

Accordingly, even if tolerances occur during the manufacture of the internal parts of the intraoral scanner, it is possible to easily align the optical axes of the optical devices during assembly, and to improve the product's performance and maintain uniform quality

The description of the present invention described above 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 dispersed form, and likewise components described as distributed may 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.

Explanation of symbols

10, 10' housing

11, 11' body part

12, 12' probe tip

13, 13' reflector

20, 20' Optics

21, 21' lens

22, 22' light source

30, 30' image board

31, 31' image sensor

40, 40' ball joint device

41, 41' joint socket part

42, 42' joint groove

43, 43' ball stud

44, 44' joint ball part

45, 45' ball stud support

50, 50' lens support

60 light path change

100, 100' 3D Intraoral Scanner

Claims

a housing having an opening formed at one end;

an optical device including a light source irradiating light toward the opening and a pair of lenses spaced apart from the light source and through which the light flowing into the opening passes;

a pair of image boards on which an image sensor for receiving the light passing through the lens is disposed; and

a ball joint device for adjusting the optical axis of the lens; including,

The lens, the image board and the ball joint device are integrally coupled, three-dimensional intraoral scanner.
The method of claim 1,

The lens is seated on a hollow lens support unit coupled to one side of the image board,

The ball joint device is coupled to the other side of the image board, three-dimensional intraoral scanner.
The method of claim 1,

It is disposed between the lens and the image sensor, further comprising a pair of optical path changing units for changing the path of the light passing through the lens,

The lens, the image board, the optical path change unit and the ball joint device are integrally coupled, three-dimensional intraoral scanner.
4. The method of claim 3,

The lens is seated on a hollow lens support unit coupled to the front end of one side of the image board,

The ball joint device is coupled to the rear end of one side of the image board, three-dimensional intraoral scanner.
5. The method according to any one of claims 1 to 4,

The ball joint device,

a joint socket part in which a joint groove part is formed;

a ball stud portion in which a joint ball portion is formed so as to be rotatably coupled to the joint groove portion; and

A three-dimensional intraoral scanner comprising a ball stud support for supporting the ball stud.
6. The method of claim 5,

The joint ball part is made in a spherical shape,

The joint groove portion consists of a spherical groove corresponding to the joint ball portion, a three-dimensional intraoral scanner.
7. The method of claim 6,

Grease is accommodated between the joint groove portion and the joint ball portion, three-dimensional intraoral scanner.
7. The method of claim 6,

The ball joint device for adjusting the optical axis of the lens and the light source, three-dimensional intraoral scanner.
5. The method according to any one of claims 1 to 4,

The housing, the three-dimensional intraoral scanner is provided with a manipulation unit that can operate the ball joint device.
10. The method of claim 9,

The housing, the three-dimensional intraoral scanner is provided with a fixing portion for limiting the movement of the ball joint device.