WO2022154622A1 - 3차원 스캐너 - Google Patents
3차원 스캐너 Download PDFInfo
- Publication number
- WO2022154622A1 WO2022154622A1 PCT/KR2022/000828 KR2022000828W WO2022154622A1 WO 2022154622 A1 WO2022154622 A1 WO 2022154622A1 KR 2022000828 W KR2022000828 W KR 2022000828W WO 2022154622 A1 WO2022154622 A1 WO 2022154622A1
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- WIPO (PCT)
- Prior art keywords
- light
- camera
- polarizing filter
- case
- scanner
- Prior art date
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- 230000010287 polarization Effects 0.000 claims abstract description 55
- 230000003287 optical effect Effects 0.000 claims abstract description 44
- 238000003384 imaging method Methods 0.000 claims description 69
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- 229910052602 gypsum Inorganic materials 0.000 description 2
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Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/204—Image signal generators using stereoscopic image cameras
- H04N13/254—Image signal generators using stereoscopic image cameras in combination with electromagnetic radiation sources for illuminating objects
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C9/00—Impression cups, i.e. impression trays; Impression methods
- A61C9/004—Means or methods for taking digitized impressions
- A61C9/0046—Data acquisition means or methods
- A61C9/0053—Optical means or methods, e.g. scanning the teeth by a laser or light beam
-
- 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
- A61B1/00163—Optical arrangements
- A61B1/00172—Optical arrangements with means for scanning
-
- 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
- A61B1/00163—Optical arrangements
- A61B1/00186—Optical arrangements with imaging filters
-
- 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
- A61B1/06—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 with illuminating arrangements
- A61B1/0646—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 with illuminating arrangements with illumination filters
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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
- 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
- A61B1/247—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 with means for viewing areas outside the direct line of sight, e.g. dentists' mirrors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
- G01B11/2545—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object with one projection direction and several detection directions, e.g. stereo
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/20—Image signal generators
- H04N13/204—Image signal generators using stereoscopic image cameras
- H04N13/239—Image signal generators using stereoscopic image cameras using two 2D image sensors having a relative position equal to or related to the interocular distance
Definitions
- the present invention relates to a three-dimensional scanner, and more particularly, to a three-dimensional scanner that can easily obtain a three-dimensional model representing an object.
- a 3D scanner is widely used in the field of dental treatment, and a user of the 3D scanner may establish a treatment plan by easily acquiring a 3D model of an object using CAD/CAM technology.
- a prosthetic treatment product manufacturer in a laboratory can easily design and manufacture a prosthetic treatment product based on the obtained 3D model.
- the object measured by the 3D scanner is a translucent object
- light reflected from the inside of the object in addition to the light reflected from the surface of the object may be accommodated in the camera.
- the light reflected from the inside of the object is received by the camera, there is a fear that the sharpness of image data for generating a three-dimensional model is deteriorated.
- FIG. 1 is a schematic diagram of three-dimensional information acquisition using a three-dimensional scanner and a schematic diagram of applying a polarization filter.
- a three-dimensional scanning model of teeth in the oral cavity using a three-dimensional scanner as shown in FIG. is obtained and a 3D model is obtained from it.
- the light generated from the light generating unit 170 passes through the projection lens 171 , is reflected in the oral cavity including the tooth, which is the object O, and then is incident on the inside through the camera lens 121 to the imaging sensor 130 . ) to obtain a three-dimensional model.
- the projected structured light is accurately projected onto the teeth, which is the surface of the object O, and obtained.
- the projected light is an inner reflection material such as a tooth rather than a surface reflection material that is reflected from the surface like a gypsum model
- the projected light of the object is transmitted through the material as well as the surface of the object
- a first polarizing plate 180a is provided in the projection path before the light is projected from the light generating unit 170 to the object O
- the second polarizing plate 180b should be provided in the incident path before being reflected from the object O and incident on the camera lens 121, which means that in the case of a single camera, at least two polarizing plates 180a and 180b should be provided.
- the stereo vision method it means that at least three polarizers must be provided, making it very difficult to design a slim overall product.
- a single polarizing filter that can commonly cover the light projection lens 171 and the camera lens 121 is used to block the light reflected inside the object from being received by the camera. have.
- new problems may arise even when such a polarization filter is used.
- a first problem may arise from the nature of the reflection of some of the light incident on the surface of the polarizing filter. Some of the light generated from the light projector does not pass through the polarizing filter and may be reflected from the surface of the polarizing filter. A 'ghost image' may be created. The ghost image may obscure surface data representing the object, preventing the user from acquiring a precise 3D model.
- the second problem may be caused by the arrangement position of the conventional polarizing filter. More specifically, the conventional polarizing filter is inserted and coupled to the inside of the 3D scanner. Accordingly, cleaning (maintenance/maintenance) of the polarizing filter to remove contamination generated on the polarizing filter is not easy.
- the present invention provides a three-dimensional scanner including a polarizing filter disposed to be spaced apart from the front surface of the camera by a predetermined distance.
- the present invention provides a three-dimensional scanner in which the polarization filter is formed to be inclined at a predetermined angle.
- the present invention provides a three-dimensional scanner in which the polarizing filter is exposed to the outside under specific conditions.
- a three-dimensional scanner includes a camera arranged to receive incident light, a light projector arranged on one side of the camera to irradiate light to an object, and a front surface of the camera and a polarizing filter disposed at a predetermined distance from the polarizing filter, wherein the polarizing filter is inclined at a predetermined angle with respect to a plane perpendicular to an optical path of the light irradiated by the light projector. At least a portion may pass through the polarizing filter, and the remaining portion may be reflected from the surface of the polarizing filter to travel outside the lens of the camera.
- the 3D scanner according to the present invention may further include various additional components in addition to the above-described configuration.
- the user can obtain clear image data while minimizing the occurrence of ghost images, thereby obtaining an accurate three-dimensional model.
- the position of the polarizing filter is spaced apart a predetermined distance in front of the camera, and since one surface of the polarizing filter is exposed as a whole, there is an advantage of easy maintenance/repair of the polarizing filter.
- 1 is a schematic diagram of obtaining three-dimensional information using a three-dimensional scanner and a schematic diagram of applying a polarization filter.
- FIG. 2 is a perspective view showing an embodiment of a three-dimensional scanner according to the present invention.
- FIG. 3 is an exploded perspective view of FIG. 2 .
- FIG. 4 is a diagram illustrating an arrangement relationship between a camera, a polarizing filter, and an optical path changing member.
- FIG. 5 is a side view of a part of a three-dimensional scanner according to the present invention.
- FIG. 6 is a schematic diagram illustrating a process in which some of the light generated from the light projector proceeds toward the camera when viewed from the side.
- FIG. 7 is a schematic view of FIG. 6 viewed from the top.
- FIG. 8 is a schematic diagram illustrating a process in which the angle of the polarizing filter is changed according to a set distance between the polarizing filter and the camera.
- FIG. 9 is a schematic view showing the angle of the polarizing filter according to the angle of the optical path changing member.
- the three-dimensional scanner 1 may refer to a device that scans an object to obtain image data representing the object, and obtains a three-dimensional digital model of the object based on the image data.
- the 3D scanner 1 may be a table type scanner that holds the object on a tray and acquires a 3D model of the object according to rotation and tilting motions of the tray, or a scanning process by holding the object by the user and directing the object It may be a handheld type scanner that obtains a 3D model of an object by performing .
- the accompanying drawings have been described using a handheld type scanner as an example, but the present invention is not necessarily limited thereto.
- FIG. 2 is a perspective view showing an embodiment of the three-dimensional scanner 1 according to the present invention
- FIG. 3 is an exploded perspective view of FIG. It is to show the arrangement relationship of the member 60
- Figure 5 is a side view of a part of the three-dimensional scanner (1) according to the present invention.
- an embodiment of the three-dimensional scanner 1 according to the present invention includes a case 10 that can be drawn in and out of the oral cavity.
- a camera 20 may be disposed inside the case 10 .
- the camera 20 may receive light incident into the case 10 .
- the camera 20 is a single camera 20 and may be disposed inside the case 10 .
- the camera 20 is a pair of stereo cameras 20 , as shown in FIG. 3 , and may be disposed inside the case 10 .
- the camera 20 when the camera 20 is arranged as a pair of stereo cameras 20, the light incident from one end of the case 10 is spaced apart in the width direction of the case 10 to pass through different paths, respectively. can be placed so Hereinafter, it is assumed that the camera 20 is disposed inside the case 10 for convenience of description, but it should be noted that the application of the single camera 20 is not completely excluded.
- 'light' refers to light in the visible region that can be recognized by the human eye in a broad sense, but includes all of the light in the infrared or ultraviolet region that can be observed using a special optical device. It may be a concept including, or in a narrow sense, it may refer to the shape of an object to be measured.
- the object to be measured by the three-dimensional scanner 1 according to the present invention is the inside of the patient's actual oral cavity, an impression model obtained by taking an impression of the patient's oral cavity, and a coagulation material (eg, plaster) to the impression model. It may include a gypsum model obtained by applying it.
- the case 10 may be provided with an opening 16 that is opened so that the image of the object is introduced into the inside in the form of light through one end.
- the opening 16 may be an entrance through which light from the outside of the case 10 flows into the inside of the case 10 .
- the light incident through the opening 16 is transmitted to each of the stereo cameras 20 while forming different light paths.
- the light transmitted through the stereo camera 20 may be received by the 3D scanner 1 through imaging sensors 31b and 32b provided on imaging boards 31a and 32a to be described later, and an image may be obtained.
- the image can be secured with a plurality of image data at the same time, if the separation distance between the pair of stereo cameras 20 and the focal length of the target point photographed through each stereo camera 20 are known, the image data corresponding to the image data is known. 3D data can be obtained.
- the camera 20 may include at least one imaging lens capable of focusing on an image in the oral cavity.
- the camera 20 may include a plurality of imaging lenses 21 and 22, and an imaging board 31a having imaging sensors 31b and 32b corresponding to the respective imaging lenses 21 and 22; 32a) may be further included.
- an embodiment of the three-dimensional scanner 1 according to the present invention is a camera control board on which electrical components for controlling the operation of a pair of stereo cameras 20 are mounted and electrical components for processing the scanned image It may further include a mounted scanning control board.
- the case 10 as shown in FIG. 3, has the above-described pair of stereo cameras 20, imaging boards 31a and 32a, a camera control board (not shown) and a scanning control board (not shown) built-in. It serves to provide a predetermined space as much as possible.
- the case 10 includes a lower case 12 having a predetermined space in which the components are embedded, and a lower case 12 provided on the upper side of the lower case 12 , ) is detachably coupled to and includes a body case 11 made of an upper case 13 that covers the components.
- the case 10 is detachably coupled to one end of the body case 11 , the above-described opening 16 is formed, and light incident into the body case 11 through the opening 16 and the opening 16 ) through the body case 11 may further include a tip case 14 for guiding the light emitted from the inside.
- the light incident into the body case 11 through the opening 16 (hereinafter, referred to as 'incident light') means an image that is the appearance of an object, and the inside of the body case 11 through the opening 16 .
- the light emitted from (hereinafter referred to as 'exit light') refers to irradiation light emitted from a light projector 70 to be described later.
- the opening 16 may be formed to be opened in one direction orthogonal to the longitudinal direction of the tip case 14 .
- the opening 16 is an opening in one direction orthogonal to the longitudinal direction of the tip case 14 for convenience of configuration of the three-dimensional scanner 1 according to the present invention, and the opening 16 is necessarily formed in the tip case 14 ) need not be orthogonal to the longitudinal direction. That is, the opening 16 may be formed to have a normal vector parallel to the longitudinal direction of the tip case 14 or may be formed to have a normal vector inclined at a predetermined angle.
- a light path changing member 60 to be described later may be disposed inside the tip case 14 .
- the light path changing member 60 may serve to guide the light incident from the opening 16 to the polarization filter 80 to be described later.
- the light path changing member 60 may be formed at a position corresponding to the formation position of the opening 16 .
- the light path changing member 60 may be provided on the inner surface of the tip case 14 in order to reduce the size of the tip case (14).
- the light path changing member 60 may be a reflective mirror or a prism, but is not limited to the listed examples.
- the front end of the camera 20 may be arranged to be converged on the tip case 14 side, and overlapped by a predetermined distance toward the tip case 14 side.
- the rear end of the camera 20 may be provided to be connected to the camera mounting unit 50 fixed to the inside of the body case 11 .
- an embodiment of the three-dimensional scanner 1 according to the present invention is disposed inside the case 10, is disposed on one side of the camera 20, a predetermined light (that is, , emitted light), but may further include a light projector 70 for irradiating the emitted light to the object through the opening 16 formed at the front end of the tip case 14 of the case 10 .
- the components as described above are arranged inside the case 10, but from the user's side, the 3D scanner 1 according to the present invention can be easily gripped and used. It is possible to make the tip case 14 as long and slim as possible so that the body case 11 is manufactured to be slim, as well as to facilitate entry and withdrawal into and out of the oral cavity from the patient's side (or so that the user can easily orient the object).
- the main body case 11 may be configured such that the light projector 70 and the camera 20 are disposed therein.
- the slim design of the body case 11 is related to the layout design of the imaging sensors 31b and 32b separately provided for each incident light incident through the camera 20, as will be described later, while the tip case ( The slim design of 14) is also related to the arrangement design of the polarizing filter 80 .
- one end of the camera 20 is provided to protrude toward the tip case 14 side, and the other end of the camera 20 is inserted and installed.
- a camera mounting unit 50 forming an optical waveguide that is a path of incident light passing through the camera 20 or light emitted from the light projector 70 may be disposed.
- the optical waveguide formed in the camera mounting unit 50 may be provided in a darkroom form so that the incident light incident from the opening 16 and the emitted light emitted from the light projector 70 are mutually partitioned and do not affect each other.
- the optical waveguide includes an output light path unit 53 providing an optical path from the light projection lens 71 of the light projector 70 to the tip case 14 side of the emitted light, and a first imaging lens ( 21) to include a side incident light path unit 51 that provides an optical path of the incident light, and the other side incident light path unit 52 that provides an optical path of the incident light that is incident through the second imaging lens 22.
- each of the outgoing light path unit, the one incident light path unit 51 and the other side incident light path unit 52 is provided to be partitioned from each other, so that the light from each path does not affect each other.
- the light projector 70 is located at the center of the other end of the pair of stereo cameras 20 spaced apart from each other by a predetermined distance in the width direction of the case 10, and the output light path part 53 is one side. It may be formed between the incident light path unit 51 and the other incident light path unit 52 .
- the first imaging lens 21 is formed on one side with the light projector 70 as the center, and the first imaging lens 21 is formed on the other side with the light projector 70 as the center.
- a pair of stereo cameras 20 may be configured by including a second imaging lens 22 opposite to the second imaging lens 22 .
- the one incident light path unit 51 and the other incident light path unit 52 are formed to coincide with the longitudinal directions of the imaging lenses 21 and 22 corresponding to each other so that the incident light from the camera 20 is transmitted. It may be formed to be opened to one side and the other side of the camera mounting unit 50 .
- the imaging boards 31a and 32a on which the imaging sensors 31b and 32b are integrated may be vertically disposed so as to be in close contact with one side wall in the width direction and the other side wall in the width direction of the case 10 .
- the one-side imaging board 31a is disposed to be in close contact with one side of the camera mounting unit 50 , and may be disposed between one side wall of the case 10 in the width direction.
- the other imaging board 32a may be disposed between the other side wall in the width direction of the case 10 so as to be disposed in close contact with the other side surface of the camera mounting unit 50 .
- the one side imaging board 31a is provided such that the imaging sensor 31b integrated therein is exposed to the one side incident light path part 51 , and the other imaging board 32a has the imaging sensor 32b integrated thereon. It may be provided to be exposed to the other incident light path unit 52 .
- One of the pair of light path changing mirrors 41 and 42 is one side that changes the path of the incident light so that the incident light transmitted through the one side incident light path unit is irradiated to the imaging sensor 31b integrated on the one side imaging board 31a.
- the optical path changing mirror 41, the other of the pair of optical path changing mirrors 41 and 42, is an imaging sensor 32b that integrates the incident light transmitted through the other incident light path unit on the other imaging board 32a. It may be the other optical path changing mirror 42 that changes the path of the incident light so as to be irradiated with the .
- the pair of optical path changing mirrors 41 and 42 may include a reflective mirror capable of reflecting light. However, it is not necessarily limited to only the reflective mirror, and may include other optical elements capable of reflecting light.
- the main technical gist is to secure a three-dimensional model of the appearance (ie, image) of the object using the camera 20 .
- one end (referring to the direction in which the tip case 14 is provided in the drawing) of the pair of stereo cameras 20 has an optical path changing member 60 provided in one opening 16, respectively.
- the other end of the pair of stereo cameras 20 (referring to the direction in which the light projector 70 is provided in the drawing) directs the incident light passing through each of them in a straight line. It should have a structure that penetrates in the direction.
- the pair of imaging boards 31a and 32a should be spaced apart from each other in the width direction of the case 10 so as to be orthogonal to the straight direction of the other end of each of the pair of stereo cameras 20 .
- the incident light path portions 51 and 52 are formed to be opened to one side and the other side of the camera mounting unit 50, respectively, and, The installation positions of the imaging boards 31a and 32a are vertically disposed between one side and the other side of the camera mounting unit 50 and one side wall and the other side wall of the case 10, and a pair of stereo cameras 20 pass through
- the body case 11 is slim so that a measurer can easily grip and use it with only his thumb, index finger, and middle finger. can do.
- the pair of optical path changing mirrors 41 and 42 is at right angles to one surface of each of the imaging sensors 31b and 32b provided on the pair of imaging boards 31a and 32a for incident light passing through the camera 20 . It may be arranged to have a reflector surface of an incident angle.
- the reflector surface may be disposed to be inclined with respect to the longitudinal direction of the case 10 . That is, the one side optical path changing mirror 41 is formed by the reflector surface of the one side optical path changing mirror 41 after the incident light that has passed through the first imaging lens 21 is incident through the one side incident light path unit 51 . It may be provided to be reflected and irradiated to the imaging sensors 31b and 32b of the one side imaging board 31a. Similarly, the other side optical path changing mirror 42 is formed by the reflector surface of the other side optical path changing mirror 42 after the incident light that has passed through the second imaging lens 22 is incident through the other side incident light path unit 52 . It may be provided to be reflected and irradiated to the imaging sensors 31b and 32b of the other imaging board 31b.
- the polarization filter 80 which is one of the configurations of the 3D scanner 1 according to the present invention will be described in detail.
- the 3D scanner 1 may include a polarization filter 80 .
- the polarization filter 80 may be disposed inside the case 10 to polarize the light introduced into the 3D scanner 1 .
- the polarization filter 80 may be disposed to be spaced apart from the front lens of the camera 20 by a predetermined set distance dc.
- the polarizing filter 80 is the light reflected from the inside of the object O when the light (ie, incident light) introduced from the outside of the 3D scanner 1 into the camera 20 is received by the lens of the camera 20 . 20) can be prevented from being accommodated as a lens. Accordingly, the user can obtain clear image data representing the object by using the 3D scanner 1 , and there is an advantage in that an accurate 3D model can be obtained.
- the polarization filter 80 polarizing the incoming light from the outside, when the output light generated from the light projector 70 is irradiated to the outside of the 3D scanner 1 and does not illuminate the object, a clear image There is a problem that data cannot be acquired.
- at least a portion of the emitted light emitted by the light projector 70 may pass through the polarization filter 80 and may be irradiated to the outside of the 3D scanner 1 , but the remaining portion may be the surface of the polarization filter 80 .
- the image data may include a so-called 'ghost image' or noise in which an image brighter than the surrounding image is generated by the emitted light irradiated from the light projector 70 .
- the polarization filter 80 may be formed to be inclined by a predetermined angle ⁇ in one direction. More specifically, the polarization filter 80 is set at a predetermined angle ⁇ with respect to the first virtual plane C1 perpendicular to the light path (more precisely, the exit light path) of the light irradiated by the light projector 70 . It may be formed to be inclined.
- FIG. 6 is a schematic diagram showing a process in which some of the light generated from the light projector 70 proceeds toward the camera 20 when viewed from the side
- FIG. 7 is a schematic diagram of FIG. 6 viewed from the top
- FIG. 8 is a polarizing filter ( 80) is a schematic diagram showing a process in which the set angle ⁇ of the polarization filter 80 changes according to the set distance between the camera 20 and the camera 20 .
- the emitted light pr generated from the light projector 70 reaches one surface of the polarization filter 80 (which may mean an inner surface in the structure of the 3D scanner according to the present invention),
- the emitted light pr is reflected based on a normal line of one surface of the polarization filter 80 according to the law of reflection.
- the reflected light rr reflected from one surface of the polarizing filter 80 leaves the lens of the camera 20 and travels to the outside. That is, since the polarization filter 80 is formed to be inclined by a predetermined angle ⁇ in one direction, at least a portion of the emitted light pr emitted by the light projector 70 passes through the polarization filter 80 to the 3D scanner.
- the remaining part of the emitted light pr emitted by the light projector 70 is reflected from the surface of the polarization filter 80 to become reflected light rr, and the reflected light rr is transmitted to the outside of the lens of the camera 20 . It proceeds and is not accommodated in the camera 20 . Accordingly, the emitted light pr generated from the light projector 70 is directly received by the lens of the camera 20 to prevent a ghost image from being generated, and the user can be refracted from the other surface to one surface of the camera 20 ), it is possible to obtain clear image data representing the object through the incident light received. In addition, another part of the emitted light pr emitted by the light projector 70 may be absorbed by the polarization filter 80 .
- the aforementioned setting angle ⁇ may be set to satisfy the condition of the following equation.
- ⁇ is a set angle that is an inclination angle when the polarization filter 80 is formed to be inclined
- dc is a set distance spaced apart between the polarizing filter 80 from the front lens (ie, imaging lens) of the camera 20
- Dc is the lens aperture (effective diameter) of the camera 20
- lp is the distance from the light projection lens 71 of the light projector 70 to the object (that is, the distance to the projection surface on which the object is present)
- V may be the vertical length of the projection surface.
- the set angle ⁇ may be 10° or more and 90° or less, or -90° or more and -10° or less. That is, the polarization filter 80 may be formed to be inclined in a clockwise direction in the schematic diagram shown in FIG. 6 or to be inclined in a counterclockwise direction. As the set angle ⁇ of the polarizing filter 80 is determined according to the range conditions as described above, the reflected light rr generated by the light projector being reflected by the polarizing filter 80 proceeds to the outside of the lens of the camera 20 . Generation of ghost images can be prevented.
- the polarization filter 80 may be formed to be inclined by a set angle ⁇ about a predetermined rotation axis.
- the predetermined rotational axis may be a first rotational axis R1 formed in parallel to the illustrated x-axis and included in the first plane C1. That is, the polarization filter 80 may be substantially inclined clockwise or counterclockwise by a set angle ⁇ about the first rotation axis C1 in the yz plane.
- some of the light irradiated from the light projection lens 71 of the light projector 70 may be reflected from the surface of the polarization filter 80 to travel toward the first imaging lens 21 and the second imaging lens 22 . have.
- the light projection lens 71 exits the first imaging lens.
- the horizontal x-axis distance between the light traveling toward (21) and the horizontal x-axis distance between the light traveling from the light projection lens 71 toward the second imaging lens 22 may be the same.
- the shortest distance s between the imaging lenses 21 and 22 of the camera 20 and the light projection lens 71 of the light projector 70 is the polarization filter of the outermost light emitted from the light projector 70 . It may be greater than the horizontal distance of the x-axis that is reflected by (80) and travels. In this case, the light emitted from the light projector 70 can stably travel to the outside of the lens of the camera 20 , and generation of a ghost image can be more reliably prevented.
- the polarizing filter 80 when the polarizing filter 80 is disposed between the opening 16 and the optical path changing member 60 , the set distance between the polarizing filter 80 and the imaging lenses 21 and 22 of the camera 20 is excessive. In the image acquired by the camera 20 , scratches formed on the cross-section of the polarizing filter 80 , foreign substances adhering to the cross-section of the polarizing filter 80 , etc. may appear. Accordingly, the polarizing filter 80 may be disposed inside the tip case 14 , between the optical path changing member 60 and the camera 20 .
- the polarization filter 80 is formed to be inclined more than a predetermined critical angle, and the magnitude of the critical angle may decrease as the set distance dc increases.
- the polarization filter 80 is arranged to have an arbitrary first set angle ⁇ 1 at the first set distance dc1.
- the outermost ray (more precisely, the uppermost end of the light projection lens 71 ) among the emitted light pr emitted by the light projector 70 .
- the light irradiated from) may be reflected from the surface of the polarization filter 80 .
- the outermost ray reflected from the surface of the polarizing filter 80 may be received at the first position ⁇ 1 of the imaging lenses 21 and 22 of the camera 20 .
- the first position ⁇ 1 should be 0 or less.
- the first set angle ⁇ 1 that causes the first position ⁇ 1 to be 0 is called a first threshold set angle.
- the set distance of the polarizing filter 80 increases to a second set distance dc2 that is larger than the first set distance dc1, and the set angle ⁇ of the polarizing filter 80 is changed to the first set angle ⁇ 1
- the traveling distance of the reflected light reflected from the surface of the polarization filter 80 is increased. Therefore, even when the set angle ⁇ of the polarizing filter 80 is set to be smaller than the first set angle ⁇ 1, the reflected light reflected from the surface of the polarizing filter 80 is smaller than the first position ⁇ 1 of the imaging lens 21, 22) in the second position ⁇ 2.
- the set angle ⁇ may be set to be greater than or equal to the third set angle ⁇ 3 smaller than the second set angle ⁇ 2,
- the third position ⁇ 3 of the outermost ray may be larger than the second position ⁇ 2 of the outermost ray. Accordingly, when the set distance dc, which is the distance between the camera 20 and the polarization filter 80, increases, the critical set angle decreases. That is, the threshold setting angle of the polarizing filter 80 for preventing the ghost image at the second set distance dc2 is the threshold setting angle of the polarizing filter 80 for preventing the ghost image at the first set distance dc1 . It can be formed smaller.
- the light path changing member 60 may guide the light incident through the opening 16 to the polarization filter 80 and the camera 20, and the angle ⁇ of the light path changing member 60 is It may be 0° or more and 90° or less.
- the polarizing filter 80 when the polarizing filter 80 is formed to be inclined at a predetermined critical angle while having a minimum set distance, the polarizing filter 80 has an angle range ( ⁇ ) of -85° to 5° with respect to the optical path changing member 60 . - ⁇ ) can be formed to have.
- the polarizing filter 80 is formed to have the above angle range with respect to the optical path changing member 60 , so that the optical path changing member 60 refracts and/or refracts the light incident from the outside to the polarizing filter 80 . may be reflected, and the polarization filter 80 may transmit incident light reaching the outer surface by the optical path changing member 60 to be received by the imaging lenses 21 and 22 of the camera 20 .
- the three-dimensional scanner 1 is formed to protrude a predetermined thickness from one end of the body case 11 in which the light projector 70 and the camera 20 are disposed. It may further include a probe tip mount (18). The rear end of the probe tip mount 18 may be inserted into the inner space of the body case 11 , and the front end of the probe tip mount 18 may protrude forward of the body case 11 .
- the tip case 14 may be mounted to a probe tip mount 18 . The rear end of the tip case 14 may be covered on the outer peripheral surface of the probe tip mount 18 .
- a light entrance may be formed in the probe tip mount 18 .
- the light entrance may be formed in the center of the probe tip mount 18 , the path through which the light incident into the 3D scanner 1 travels to the camera 20 and the light emitted from the light projector 70 It is possible to form a path that proceeds to the outside of the three-dimensional scanner (1).
- the polarization filter 80 may be coupled to one end of the probe tip mount 18 .
- the polarization filter 80 may be attached to one end of the probe tip mount 18 .
- the coupling method is only an example, and at least one of various coupling means for coupling the polarization filter 80 to the probe tip mount 18 may be used.
- One end of the probe tip mount 18 may be formed to be inclined so that the polarization filter 80 has a predetermined angle ⁇ with respect to the camera 20 .
- the inclination of one end of the probe tip mount 18 may be the same as a predetermined set angle ⁇ of the polarizing filter 80 with respect to the camera 20 . Accordingly, the probe tip mount 18 allows the polarization filter 80 to stably maintain a predetermined set angle ⁇ with respect to the camera 20 .
- the probe tip mount 18 further includes a rotation member (not shown) that serves as the above-described first rotation axis R1, is coupled to the central portions of both sides of the polarization filter 80 to polarize It would also be possible to rotate the filter 80 .
- the polarizing filter 80 is formed so that when the tip case 14 including the opening 16 is unmounted from the probe tip mount 18 and removed from the body case 11, one surface thereof is exposed to the outside. can be That is, the outer surface of the polarizing filter 80 may be exposed to the outside when the tip case 14 is removed. Accordingly, the user may perform maintenance/repair work (eg, cleaning) on the outer surface of the polarizing filter 80 .
- maintenance/repair work eg, cleaning
- the entire surface of the polarizing filter 80 may be exposed to the outside without being covered by the probe tip mount 18 .
- the outer surface of the polarizing filter 80 is not fitted to the inside of the probe tip mount 18 , and the entire outer surface is exposed to the outside as the tip case 14 is removed from the body case 11 . can Accordingly, there is an advantage in that it is possible to solve the problem of the accumulation of foreign substances between the polarizing filter and the other component, which may occur when the polarizing filter 80 is fitted to another component in the prior art, and the difficulty in maintenance/repair.
- the damaged polarization filter 80 can be easily removed and replaced. can be Accordingly, the time for maintaining/repairing the polarization filter 80 is shortened, and the 3D scanner 1 according to the present invention can also be maintained in the best state for a long period of time.
- the probe tip mount 18 may be formed of a heat-dissipating material to easily dissipate heat in the body case 11 to the outside of the body case 11 .
- the heat dissipation material is preferably an aluminum material.
- the heat dissipation material is not limited to the aluminum material, and may be formed of another material having a heat dissipation function.
- the outgoing light emitted from the light projector 70 sequentially passes through the outgoing light path part 53 of the optical waveguide formed in the camera mounting part 50 and the input/exit light path part formed in the tip case 14 to the opening 16 . It is irradiated to the side, and the emitted light is irradiated into the oral cavity of the patient through the opening 16 by the optical path changing member 60 .
- the image data representing the object is present in the form of light by the emitted light, and is sequentially incident to the inside of the tip case 14 through the opening 16, as opposed to the emitted light, and the light path changing member 60 ), the path is changed, and is substantially incident to the camera lens for photographing the reflective surface of the optical path changing member 60 via the above-described incident light path units 51 and 52 .
- image data may be secured by being irradiated to the imaging sensors 31b and 32b of the corresponding imaging boards 31a and 32a by the respective optical path changing mirrors 41 and 42 .
- a three-dimensional model representing the object may be easily obtained based on the obtained image data.
- the present invention provides a three-dimensional scanner that includes a polarizing filter that is disposed to be spaced apart from the front of the camera by a predetermined distance and inclined at a predetermined angle to prevent generation of a ghost image and improve maintenance/repair convenience of the polarizing filter. to provide.
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Abstract
Description
Claims (8)
- 입사된 광을 수용하도록 배치된 카메라;상기 카메라의 일측에 배치되어 대상체로 광을 조사하는 광 프로젝터; 및상기 카메라의 전면으로부터 소정 설정거리 이격되어 배치된 편광 필터;를 포함하고,상기 편광 필터는, 상기 광 프로젝터가 조사하는 광의 광로와 수직인 평면에 대해 소정 설정각도로 경사지도록 형성되어, 상기 광 프로젝터가 조사하는 광 중 적어도 일부는 상기 편광 필터를 투과하고, 나머지 일부는 상기 편광 필터의 표면으로부터 반사되어 상기 카메라의 렌즈 외부로 진행하는 것을 특징으로 하는 3차원 스캐너.
- 청구항 1에 있어서,상기 편광 필터는 소정 임계각도 이상으로 경사지도록 형성되고, 상기 임계각도의 크기는 상기 설정거리가 증가함에 따라 감소하는 것을 특징으로 하는 3차원 스캐너.
- 청구항 1에 있어서,상기 카메라는 상기 광 프로젝터를 중심으로 일측에 형성되는 제1 이미징 렌즈와, 상기 광 프로젝터를 중심으로 타측에 형성되며 상기 제1 이미징 렌즈와 대향 형성되는 제2 이미징 렌즈를 포함하고,상기 편광 필터는 소정 회전축을 중심으로 상기 설정각도만큼 경사지도록 형성되어,상기 광 프로젝터가 조사한 광의 일부가 상기 편광 필터의 표면으로부터 반사되어 각각 상기 제1 이미징 렌즈 측과 상기 제2 이미징 렌즈 측으로 진행할 때의 수평 이격거리가 서로 동일한 것을 특징으로 하는 3차원 스캐너.
- 청구항 1에 있어서,내부에 상기 편광 필터가 배치되도록 형성되는 케이스; 를 더 포함하고,상기 케이스는,내부에 상기 광 프로젝터 및 상기 카메라가 배치되는 본체 케이스; 및상기 개구부로부터 입사된 광을 상기 편광 필터로 가이딩하는 광경로 변경부재가 내부에 배치되고, 상기 본체 케이스에 착탈 결합되는 팁 케이스;를 포함하고,상기 편광 필터는 상기 광경로 변경부재와 상기 카메라 사이에 배치되는 것을 특징으로 하는 3차원 스캐너.
- 청구항 5에 있어서,상기 편광 필터가 최소 설정거리를 가지면서 소정 임계각도로 경사지도록 형성될 때, 상기 편광 필터는 상기 광경로 변경부재에 대해 -85° 내지 5°의 각도 범위에서 형성되는 것을 특징으로 하는 3차원 스캐너.
- 청구항 1에 있어서,내부에 상기 광 프로젝터 및 상기 카메라가 배치되는 본체 케이스의 일단으로부터 소정 두께 돌출 형성되는 프로브 팁 마운트;를 포함하고,상기 편광 필터는 상기 프로브 팁 마운트의 일단에 결합되어, 개구부를 포함하는 팁 케이스가 상기 본체 케이스로부터 탈거되었을 때 상기 편광 필터의 일면은 외부로 노출되는 것을 특징으로 하는 3차원 스캐너.
- 청구항 7에 있어서,상기 편광 필터의 상기 일면 전체는 상기 프로브 팁 마운트에 의해 커버되지 않고 외부로 노출되는 것을 특징으로 하는 3차원 스캐너.
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EP22739814.6A EP4279023A1 (en) | 2021-01-18 | 2022-01-17 | Three-dimensional scanner |
US18/272,763 US20240098240A1 (en) | 2021-01-18 | 2022-01-17 | Three-dimensional scanner |
CN202280010479.XA CN116723809A (zh) | 2021-01-18 | 2022-01-17 | 三维扫描仪 |
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KR10-2021-0006854 | 2021-01-18 | ||
KR20210006854 | 2021-01-18 | ||
KR1020210187627A KR20220104634A (ko) | 2021-01-18 | 2021-12-24 | 3차원 스캐너 |
KR10-2021-0187627 | 2021-12-24 |
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Citations (5)
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---|---|---|---|---|
JP2006081842A (ja) * | 2004-09-17 | 2006-03-30 | Morita Mfg Co Ltd | 撮影用補助装置 |
KR20070098789A (ko) * | 2004-10-14 | 2007-10-05 | 더 프록터 앤드 갬블 캄파니 | 전자기 측정 디바이스를 교정하는 방법 및 장치 |
US20190388195A1 (en) * | 2018-06-21 | 2019-12-26 | Qisda Corporation | Intraoral scanner |
KR20200064922A (ko) * | 2018-11-29 | 2020-06-08 | 주식회사 메디트 | 구강 스캐너 |
KR20200134145A (ko) * | 2019-05-21 | 2020-12-01 | 주식회사 메디트 | 3차원 구강 스캐너 |
-
2022
- 2022-01-17 WO PCT/KR2022/000828 patent/WO2022154622A1/ko active Application Filing
- 2022-01-17 US US18/272,763 patent/US20240098240A1/en active Pending
- 2022-01-17 EP EP22739814.6A patent/EP4279023A1/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2006081842A (ja) * | 2004-09-17 | 2006-03-30 | Morita Mfg Co Ltd | 撮影用補助装置 |
KR20070098789A (ko) * | 2004-10-14 | 2007-10-05 | 더 프록터 앤드 갬블 캄파니 | 전자기 측정 디바이스를 교정하는 방법 및 장치 |
US20190388195A1 (en) * | 2018-06-21 | 2019-12-26 | Qisda Corporation | Intraoral scanner |
KR20200064922A (ko) * | 2018-11-29 | 2020-06-08 | 주식회사 메디트 | 구강 스캐너 |
KR20200134145A (ko) * | 2019-05-21 | 2020-12-01 | 주식회사 메디트 | 3차원 구강 스캐너 |
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US20240098240A1 (en) | 2024-03-21 |
EP4279023A1 (en) | 2023-11-22 |
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