KR101662566B1 - Intraoral scanner altering scanning area and scanning detail by changing optical unit - Google Patents

Intraoral scanner altering scanning area and scanning detail by changing optical unit Download PDF

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KR101662566B1
KR101662566B1 KR1020150070162A KR20150070162A KR101662566B1 KR 101662566 B1 KR101662566 B1 KR 101662566B1 KR 1020150070162 A KR1020150070162 A KR 1020150070162A KR 20150070162 A KR20150070162 A KR 20150070162A KR 101662566 B1 KR101662566 B1 KR 101662566B1
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South Korea
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optical module
pattern
focal length
optical
area
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KR1020150070162A
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Korean (ko)
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문안오
김영균
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주식회사바텍
(주)바텍이우홀딩스
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/24—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the mouth, i.e. stomatoscopes, e.g. with tongue depressors; Instruments for opening or keeping open the mouth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C19/00—Dental auxiliary appliances
    • A61C19/04—Measuring instruments specially adapted for dentistry

Abstract

The present invention provides a mouth scanner capable of changing a scanning area and precision by exchanging an optical unit. The mouth scanner capable of changing a scanning area and precision by exchanging an optical unit acquires three dimensional data of a structure in a mouth, and comprises: a pattern generation unit to generate a pattern; an image receiving unit to receive a reflection pattern reflected from the structure by emitting the pattern; a first optical module to provide a first focal distance area for the pattern generated by the pattern generation unit; and a second optical module to provide a second focal distance area for the reflection pattern. The pattern generation unit and the image receiving unit are embedded in a main body housing. The first and the second optical module are embedded in a first replacement tip housing which can be attached and detached from the main body housing.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an optical scanning unit,

The present invention relates to a dental mouthpiece scanner, and more particularly, to a mouthpiece scanner capable of easily changing a scan area and an accuracy by optical part exchange.

Generally, in a dental hospital, impression taking is performed to produce a gypsum model of a patient's teeth, and the patient's oral structures are treated and treated.

As described above, impression making process for making a gypsum model causes problems such as material consumption and cross-infection, possibility of damage to the manufactured model, and storage problems.

Particularly, when an impression material is manually used to impression a damaged tooth of a patient, there is a problem in that it is not possible to provide an accurate manufacturing value of the prosthesis. That is, it is impossible to confirm the degree of error with respect to the three-dimensional information of the manufactured prosthesis. For this reason, there is a problem that the actually manufactured prosthesis is inconsistent in the oral cavity of the patient.

Recently, in order to acquire three-dimensional images of the shape of teeth and oral tissues during dental treatment of restoration of teeth, prosthesis, etc., a three-dimensional image obtained by photographing a subject having a three- Dimensional scanner and a dental three-dimensional scanner for obtaining the same image information as the actual image of the subject by deriving the dimensional image.

However, in the conventional dental 3D scanner, since the measurement area and the measurement resolution are fixed and released, the dental hospital is required to have different types of scanners according to the range to be scanned.

Korean Patent Publication No. 10-2013-0019296

SUMMARY OF THE INVENTION It is an object of the present invention to provide an oral scanner capable of easily changing a scan area and an accuracy by exchanging an optical part in order to solve the above problems.

In order to accomplish the above object, the present invention provides an oral scanner capable of changing a scan area and an accuracy by optics exchange for acquiring three-dimensional data of an intraoral structure, comprising: a pattern generator for generating a pattern; An image receiving unit for receiving a reflection pattern irradiated with the pattern and reflected on the structure; A first optical module for providing a first focal length region with respect to a pattern generated by the pattern generating unit; And a second optical module for providing a second focal length area with respect to the reflection pattern, wherein the pattern generator and the image receiver are housed in a main body housing, and the first optical module and the second optical module Provided is an oral scanner capable of changing a scan area and precision by optical part exchange incorporated in a first replacement tip housing detachable to a main body housing.

In this case, a third optical module for providing a third focal length region with respect to a pattern generated by the pattern generating portion, and a second optical fiber module including a fourth optical module for providing a fourth focal length region with respect to the reflection pattern, Wherein the second scan region for the structure along the third focal length region and the fourth focal length region includes a second scan region for the structure along the first focal length region and the second focal length region, 1 scan area.

At this time, the main housing has a control unit for performing a calibration with respect to the first optical module, the second optical module, the third optical module, and the fourth optical module when the first and second replacement tip housings are detached and attached, . ≪ / RTI >

Since the scanning area and the scanning accuracy can be easily changed by the optical part exchange, the oral scanner according to the present invention can realize an optimal scanning environment suitable for a scanning object with a single scanner body.

1 is a schematic view of a conventional oral scanner.
2 is a schematic diagram of an oral scanner according to an embodiment of the present invention.
3 shows an example in which the replacement tip housing is replaceably mounted on the body housing.
4 is a block diagram of a controller according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The shape and the size of the elements in the drawings may be exaggerated for clarity and the same elements are denoted by the same reference numerals in the drawings.

And throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between. Furthermore, when a component is referred to as being "comprising" or "comprising", it is to be understood that this does not exclude other components, do.

Furthermore, the terms " first ", " second ", and the like are used to distinguish one element from another element, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

1 is a schematic view of a conventional oral scanner.

The conventional oral scanner 100 includes a light source 150, a pattern screen 160, a first optical module 120, a reflective mirror 110, a second optical module 130, an image receiving unit 140, And a processing unit 170.

1, the light emitted from the light source 150 has a pattern by the pattern screen 160 and passes through the first optical module 120 and the reflection mirror 110 to irradiate a scan object (a tooth in the present invention) do. The reflection pattern reflected from the tooth surface is received by the image receiving unit 140 through the reflection mirror 110 and the second optical module 130. The signal processing unit 170 processes the three- .

At this time, the scan range and the scan accuracy are determined according to the characteristics of the first optical module 120 and the second optical module 130. [ A long focal length optical module has a narrow scan range, while a short focal length module has a relatively wide scan range. In order to configure the optical module such that the focal distance of the optical module is variable, problems such as an increase in module size and an increase in manufacturing cost arise, and therefore, the conventional oral scanner 100 is manufactured to have a fixed scanning area and a scanning accuracy.

2 is a schematic diagram of an oral scanner according to an embodiment of the present invention. 2, the oral scanner 1000 according to the present invention includes a reflective mirror 210, a first optical module 220, a second optical module 230, a pattern generating unit 310, an image receiving unit 320, And a control unit 330.

In the present invention, the reflective mirror 210, the first optical module 220, and the second optical module 230 are provided in the replacement tip housing 200, and the pattern generating unit 310, the image receiving unit 320, 330 are provided in the main body housing 300.

The main body housing 300 will now be described.

The pattern generating unit 310 generates a pattern. That is, it generates structured light for scanning an intraoral structure (tooth) to be scanned. The structured light is irradiated to teeth for the purpose of acquiring three-dimensional data by triangulation, and can be appropriately selected from among various patterns such as a stripe type, a net type, and a checkered type according to a region to be scanned and precision.

The pattern generated by the pattern generating unit 310 passes through the first optical module 220 and is reflected by the reflection mirror 210 to be irradiated onto the intraoral structure. The pattern generating unit 310 may be a micro-type projector such as a micro-type or pico-type to easily generate a necessary pattern.

The image receiving unit 320 receives the reflection pattern reflected from the intraoral structure. As shown in the figure, the reflection pattern is received by the image receiving unit 320 through the reflection mirror 210 and the second optical module 230. That is, the image receiving unit 320 receives the teeth image irradiated with the structured light.

The image receiving unit 320 may be a light receiving element such as a complementary metal-oxide semiconductor (CMOS), a charge coupled device (CCD), or a position sensitive device (PSD). However, It is possible.

The control unit 330 processes the tooth image irradiated with the structured light received by the image receiving unit 320 to generate three-dimensional data. In the present invention, the triangulation method is used to generate three-dimensional data. In order to apply the triangulation method, an initialization process is first required to find the geometric relationship between the pattern generator 310 and the image receiver 320. For this, a correction calculation for finding the geometrical relationship between the pattern generating unit 310 and the image receiving unit 320 is required. In the present invention, a correction model based on a pinhole camera is used as a correction algorithm. The control unit 330 controls the pattern generating unit 310 and the image receiving unit 320 to be modeled by a pinhole camera.

Next, the replacement tip housing 200 will be described.

The replacement tip housing 200 is provided with a reflective mirror 210, a first optical module 220 and a second optical module 230.

The first optical module 220 irradiates the pattern generated by the pattern generating unit 310 to the scan object through the reflection mirror 210.

The second optical module 230 provides the image receiving unit 320 with an image of the subject (tooth) to be scanned, that is, a tooth image irradiated with a pattern. 2, the first optical module 220 and the second optical module 230 are illustrated as independent optical modules. However, the first optical module 220 and the second optical module 230 are provided for explaining a path through which the structured light irradiated by the pattern generating unit 310 is transmitted. 1 optical module 220 and a second optical module 230 beam splitter (not shown).

3 shows an example in which the replacement tip housing is replaceably mounted on the body housing.

In the present invention, the replacement tip housing 200 is a replacement optic, and the replacement tip housing 200 is provided with various types that provide different scan areas. For convenience of explanation, a long focal length area is provided so that the replacement tip housing with the narrow scan area is provided with the first replacement tip housing 200-1, and the short focal length area is provided, (200-2).

The first optical module 220-1 and the second optical module 230-1 provided in the first replacement tip housing 200-1 are connected to the first optical module 220-1 provided in the second replacement tip housing 200-2, Providing a longer focal length area than the first optical module 220-2 and the second optical module 230-2. That is, the pattern irradiated due to the telephoto effect due to the long focal length is irradiated to a narrow area.

Conversely, the first optical module 220-2 and the second optical module 230-2 provided in the second replacement tip housing 200-2 provide a short focal length range. That is, the pattern to be irradiated due to the wide-angle effect due to the short focal distance is irradiated over a wide area.

Therefore, according to the object to be scanned, the first replacement tip housing 200-1 or the second replacement tip housing 200-2 can be coupled to the body housing 300 to perform a desired level of scan.

At this time, since each of the optical modules 220-1, 230-1, 220-2, and 230-3 has different focal length ranges, when the replacement tip housings 200-1 and 200-2 are replaced, It is necessary to perform the initialization process of the image receiving unit 310 and the image receiving unit 320.

That is, the replacement of the replacement tip housing necessitates calibration for each optical module. In the present invention, an attribute model based on a pinhole camera is used as a correction algorithm. Camera parameters consist of extrinsic parameters and intrinsic parameters. External parameters can be represented by the direction and position of the camera, and internal parameters can be represented by the camera's focal point, principal axis, and viewing angle. The external parameter can be expressed as [R T] consisting of a motion vector T indicating the position of the camera and a rotation matrix R indicating the direction of the camera. This makes it possible to transform the three-dimensional coordinate system of the real world and the camera. The internal parameter can be expressed by a matrix of [Equation 1].

[Equation 1]

Figure 112015048216517-pat00001

In the matrix of Equation (1)

Figure 112015048216517-pat00002
Represents the focal distance
Figure 112015048216517-pat00003
Represents the coefficient of strain between the x-axis and the y-axis. u 0 , v 0 represents the principal point of the image center. These can be used to convert between coordinates in the image and camera coordinates.

At this time, the calibrated parameters for the respective optical modules 220-1, 230-1, 220-2, and 230-3 use a value calculated by using a pre-calibrated camera (a value calculated by an inverse camera calibration) , Calibration is the process of finding the parameter information inside and outside the camera.

The control unit 330 stores the parameters for calibrating the optical modules 220-1, 230-1, 220-2, and 230-3 provided in the replacement tip housings 200-1 and 200-2, The optical modules 220-1, 230-1, 220-2 and 230-3 allow the pattern generating unit 310 and the image receiving unit 320 to be modeled by the pinhole camera according to the optical part exchange.

4 is a block diagram of a controller according to an embodiment of the present invention.

The control unit 330 includes an optical module correcting unit 331, a pattern setting unit 332, and a three-dimensional data generating unit 333.

The optical module correcting unit 331 stores the calibration parameters of the optical modules provided in the respective replacement tip housings 200-1, 200-2, .., 200-N. When the replacement tip housings are coupled, Apply the calibration parameters appropriate for the optical module.

The pattern setting unit 332 controls the pattern generating unit 310 so that the pattern generating unit 310 irradiates the scan light and the structural light corresponding to the scan accuracy performed by the optical module provided in the housing. At this time, the pattern setting unit 332 can receive pattern data created in advance from an external device such as a PC.

The three-dimensional data generator 333 receives the tooth image irradiated with the structured light from the image receiver 320 to generate three-dimensional data, and generates three-dimensional data based on the reflected structure light.

As described above, according to the present invention, since the scan area and the scan precision can be easily changed by the optical part exchange, an optimal scan environment can be realized with a single scanner body.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be clear to those who have.

1000: Oral Scanner 200: Replacement tip housing
210: reflection mirror 220: first optical module
230: second optical module 300: main housing
310: pattern generating unit 320: image receiving unit
330: control unit 400: handle

Claims (3)

1. An oral scanner capable of changing a scan area and an accuracy by optical exchange for acquiring three-dimensional data of an intraoral structure,
A pattern generating unit for generating a pattern;
An image receiving unit for receiving a reflection pattern irradiated with the pattern and reflected on the structure;
A first optical module for providing a first focal length region with respect to a pattern generated by the pattern generating unit; And
And a second optical module for providing a second focal length region with respect to the reflective pattern,
Wherein the pattern generating unit and the image receiving unit are built in a main body housing,
Wherein the first optical module and the second optical module are capable of varying the scan area and the precision by optical interchange housed in a first replaceable tip housing detachable to the body housing.
The method according to claim 1,
A third optical module for providing a third focal length area with respect to a pattern generated by the pattern generator, and a second replacement tip housing having a fourth optical module for providing a fourth focal length area with respect to the reflection pattern Including,
The second scan region for the structure along the third focal length region and the fourth focal length region is different from the first scan region for the structure along the first focal length region and the second focal length region, And the scanning area and the precision can be changed by the optical part exchange.
The method of claim 2,
The body housing includes a control unit for performing a calibration on the first optical module, the second optical module, the third optical module, and the fourth optical module when the first replacement tip housing and the second replacement tip housing are attached and detached And the scanning area and the precision can be changed by the optical part exchange.

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102129383B1 (en) * 2019-06-24 2020-07-02 주식회사 메디트 Calibration cradle for oral scanner
KR20210082883A (en) * 2019-12-26 2021-07-06 주식회사 메디트 Investigating method for optical portion embedded in intraoral scanner and system using the same
CN113727636A (en) * 2019-02-27 2021-11-30 3 形状股份有限公司 Scanner device with replaceable scanning tip
KR20220045457A (en) * 2020-10-05 2022-04-12 오스템임플란트 주식회사 Calibration device for oral scanner
WO2022103153A1 (en) * 2020-11-11 2022-05-19 주식회사 메디트 Oral image processing device and oral image processing method
EP3900666A4 (en) * 2018-12-21 2022-06-29 Dof Inc. Three-dimensional intraoral scanner and intraoral scanning method using same
WO2022177140A1 (en) * 2021-02-19 2022-08-25 오스템임플란트 주식회사 Oral scanner system
WO2023075543A1 (en) * 2021-10-29 2023-05-04 아크리얼 주식회사 Intraoral scanner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130019296A (en) 2011-08-16 2013-02-26 주식회사 오라픽스 Scanning system and method for oral cavity

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130019296A (en) 2011-08-16 2013-02-26 주식회사 오라픽스 Scanning system and method for oral cavity

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3900666A4 (en) * 2018-12-21 2022-06-29 Dof Inc. Three-dimensional intraoral scanner and intraoral scanning method using same
CN113727636A (en) * 2019-02-27 2021-11-30 3 形状股份有限公司 Scanner device with replaceable scanning tip
KR102129383B1 (en) * 2019-06-24 2020-07-02 주식회사 메디트 Calibration cradle for oral scanner
KR20210082883A (en) * 2019-12-26 2021-07-06 주식회사 메디트 Investigating method for optical portion embedded in intraoral scanner and system using the same
KR102370017B1 (en) * 2019-12-26 2022-03-04 주식회사 메디트 Investigating method for optical portion embedded in intraoral scanner and system using the same
KR20220045457A (en) * 2020-10-05 2022-04-12 오스템임플란트 주식회사 Calibration device for oral scanner
KR102423274B1 (en) 2020-10-05 2022-07-22 오스템임플란트 주식회사 Calibration device for oral scanner
WO2022103153A1 (en) * 2020-11-11 2022-05-19 주식회사 메디트 Oral image processing device and oral image processing method
WO2022177140A1 (en) * 2021-02-19 2022-08-25 오스템임플란트 주식회사 Oral scanner system
WO2023075543A1 (en) * 2021-10-29 2023-05-04 아크리얼 주식회사 Intraoral scanner

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