Oral cavity scanner

Abstract

The present disclosure relates to an oral cavity scanner. [Solution] An oral scanner according to one embodiment of the present disclosure includes a case having an opening formed at one end, a light source unit disposed at the other end of the case and irradiating light toward the opening, a first optical system disposed in the opening and reflecting the light irradiated from the light source unit toward a subject and reflecting light reflected from the subject toward the light source unit, a second optical system disposed between the light source unit and the first optical system and reflecting the light reflected from the first optical system, and an image sensor unit that detects the light reflected from the second optical system.

Description

[Technical field]

[0001] The present disclosure relates to oral cavity scanners, and more particularly to oral cavity scanners configured to acquire three-dimensional images of the oral cavity. [Background technology]

[0002] Digital impressions are an important starting point for today's digitalized dental treatment. The increasing importance of digital impressions in dental treatment has led to active technological developments for intraoral scanners.

[0003] An oral scanner is a device or system that is inserted into the oral cavity of a dental patient to scan the 3D structure of the teeth in a non-contact manner. Recently developed oral scanners can capture 2D image data of the inside of the mouth and create 3D models of the oral structure based on the 2D image data. Oral scanners with such functions are expanding their scope of application in clinical practice and can be used not only for dental restoration treatment but also for the production of implants and orthodontic appliances.

[0004] Meanwhile, accuracy of the impression is important for successful dental treatment. Digital impressions taken through an oral scanner are not deformed due to contraction or expansion of the impression material, and therefore have higher accuracy than traditional impressions using existing impression materials. However, in order for oral scanners to be continuously used as a tool for sophisticated dental treatments, it is necessary to improve the accuracy of scanning. In addition, since oral scanners are inserted into the oral cavity of dental patients in a non-contact manner, it is preferable for the oral scanner to have a structure that allows the patient to feel comfortable while using the oral scanner. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments disclosed herein provide an intraoral scanner having multiple optical systems arranged in a structure suitable for use in a non-contact manner inserted into the oral cavity of a dental patient. [Means for solving the problem]

[0006] An oral scanner according to one embodiment of the present disclosure includes a case having an opening formed at one end, a light source unit disposed at the other end of the case and irradiating light toward the opening, a first optical system disposed in the opening and reflecting the light irradiated from the light source unit toward a subject and reflecting the light reflected from the subject toward the light source unit, a second optical system disposed between the light source unit and the first optical system and reflecting the light reflected from the first optical system, and an image sensor unit that detects the light reflected from the second optical system.

[0007] According to an embodiment, a gap is formed in the center of the second optical system, and light emitted from the light source passes through the gap to reach the first optical system.

[0008] According to one embodiment, the second optical system includes a first reflecting portion configured to reflect light reflected from the first optical system, and a second reflecting portion configured to reflect the light reflected by the first reflecting portion toward the image sensor portion.

[0009] According to one embodiment, the first reflecting portion includes two reflecting surfaces configured such that a dihedral angle between the respective infinite planes forms a minor angle, and the second reflecting portion includes two reflecting surfaces configured such that a dihedral angle between the respective infinite planes forms a major angle.

[0010] According to one embodiment, the positions and directions of the two reflective surfaces of the second reflecting unit are set so that the two images of the subject reflected by the two reflective surfaces of the second reflecting unit and detected by the image sensor unit do not overlap.

[0011] According to one embodiment, the second optical system includes a first prism and a second prism, and light irradiated from the light source unit is configured to reach the first optical system by passing through a gap formed between the first prism and the second prism, and light reflected by the first optical system is configured to reach the image sensor unit by being reflected by a pair of mutually opposing reflective surfaces of the first prism and a pair of mutually opposing reflective surfaces of the second prism.

[0012] According to one embodiment, the dihedral angle between the infinite plane of one side reflecting surface of the first prism and the infinite plane of one side reflecting surface of the second prism is configured to be a minor angle, and the dihedral angle between the infinite plane of the other side reflecting surface of the first prism and the infinite plane of the other side reflecting surface of the second prism is configured to be a preferential angle.

[0013] According to one embodiment, the positions and directions of the other-side reflective surface of the first prism and the other-side reflective surface of the second prism are set so that the two images of the subject reflected by the two other-side reflective surfaces and detected by the image sensor unit do not overlap.

[0014] According to an embodiment, the light source unit is configured to emit patterned light or structured light.

[0015] According to one embodiment, the image sensor unit is configured to obtain two stereo images from images of the light reflected from the second optical system. Effect of the Invention

[0016] According to various embodiments of the present disclosure, since there is no need for a drive unit for adjusting the angle of each of the multiple optical systems arranged inside the case of the oral scanner, the optical systems can be densely arranged in optimal positions inside the case.

[0017] In addition, according to various embodiments of the present disclosure, a small-volume oral scanner can be realized by arranging multiple optical systems in a dense structure inside a case, so that when the oral scanner is used, it can be easily inserted into the oral cavity of a dental patient as well as moved and changed direction within the oral cavity, allowing for precise scanning of teeth.

[0018] In addition, according to various embodiments of the present disclosure, two stereo images can be obtained from images of light reflected from multiple optical systems using just one image sensor unit, thereby reducing the manufacturing costs of the oral scanner and further optimizing its internal configuration.

[0019] The effects of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic diagram showing an embodiment of an oral scanner according to the present disclosure coupled with an oral 3D modeling and visualization system. [Diagram 2] FIG. 1 is a perspective view of an oral cavity scanner according to one embodiment of the present disclosure; [Diagram 3] FIG. 1 is a perspective side view of an oral cavity scanner according to one embodiment of the present disclosure. [Figure 4] FIG. 2 is a perspective view of an oral cavity scanner according to another embodiment of the present disclosure; [Diagram 5] FIG. 2 is a perspective side view of an oral cavity scanner according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, specific details for carrying out the present disclosure will be described in detail with reference to the accompanying drawings, however, in the following description, detailed descriptions of well-known functions and configurations will be omitted if there is a risk of unnecessarily obscuring the gist of the present disclosure.

[0022] In the accompanying drawings, the same or corresponding components are given the same reference numerals. In addition, in the following description of the embodiments, duplicated description of the same or corresponding components may be omitted. However, even if the technology related to a component is omitted, it is not intended that such a component is not included in a certain embodiment.

[0023] The terms used in this disclosure will be briefly explained, and the disclosed embodiments will be specifically described. The terms used in this specification are currently selected as widely used general terms as possible while taking into consideration the functions in this disclosure, but this may change depending on the intentions or precedents of engineers engaged in related fields, the emergence of new technologies, etc. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meanings will be described in detail in the description of the relevant invention. Therefore, the terms used in this disclosure should be defined based on the meanings that the terms have and the overall content of this disclosure, rather than simply the names of the terms.

[0024] In this disclosure, the singular includes the plural unless the context clearly indicates otherwise, and the plural includes the singular unless the context clearly indicates otherwise.

[0025] In the present disclosure, when a part includes a certain element, this does not mean excluding other elements, but means that it may further include other elements, unless specifically stated to the contrary.

[0026] In this disclosure, the upper side of a drawing may be referred to as the "top" or "upper side" of the configuration illustrated in that drawing, and the lower side may be referred to as the "lower side" or "lower side". Also, the portion between the upper and lower parts of the configuration illustrated in the drawing, or the remaining portion excluding the upper and lower parts, may be referred to as the "side" or "side surface". Relative terms such as "top", "upper side", etc. may be used to describe the relationship between the configurations illustrated in the drawings, and the present disclosure is not limited by such terms.

[0027] In the present disclosure, a direction toward an internal space of a structure may be referred to as the "inside," and a direction protruding into an open external space may be referred to as the "outside." Relative terms such as "inside" and "outside" may be used to describe the relationship between components illustrated in the drawings, and the present disclosure is not limited by such terms.

[0028] In this disclosure, the reference to "A and / or B" means A, or B, or A and B.

[0029] In the present disclosure, when a certain part is said to be connected to another part, this includes not only the case where the part is directly connected to another part, but also the case where the part is connected via another structure in between.

[0030] Also, the term "module" or "unit" as used in this disclosure means a software or hardware component, and the "module" or "unit" performs a certain function. However, the term "module" or "unit" is not limited to software or hardware. The "module" or "unit" may be configured to reside on an addressable storage medium and may be configured to execute one or more processors. Thus, by way of example, a "module" or "unit" may include components such as software components, object-oriented software components, class components, and task components, and at least one of a process, a function, an attribute, a procedure, a subroutine, a program code segment, a driver, firmware, microcode, a circuit, data, a database, a data structure, a table, an array, or a variable. The components and "modules" or "units" may be combined into a smaller number of components and "modules" or "units" or the functions provided therein may be further separated into additional components and "modules" or "units".

[0031] The advantages and features of the disclosed embodiments, and the methods for achieving the same, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, and may be embodied in various different forms, and the embodiments are provided solely for the purpose of making the disclosure complete and fully conveying the scope of the invention to those skilled in the art.

[0032] FIG. 1 is a schematic diagram 100 illustrating an oral cavity scanner 110 coupled with an oral cavity 3D modeling and visualization system 120 according to one embodiment of the present disclosure.

[0033] The oral scanner 110 may be inserted into the oral cavity of a dental patient by a dental medical staff member to scan the teeth in a non-contact manner and capture a plurality of 2D image data. The oral scanner 110 may also transmit the captured plurality of 2D image data to the system 120 or independently perform 3D oral structure modeling based on the 2D image data.

[0034] The oral scanner 110 may be connected to the system 120 through a network configured to enable wired or wireless communication. Here, the network may be configured, depending on the installation environment, as a wired network such as an electrical connection line such as a copper cable, Ethernet (registered trademark), a wired home network (Power Line Communication), a telephone line communication device, and RS-serial communication, a mobile communication network, a wireless network such as WLAN (Wireless LAN), Wi-Fi, Bluetooth (registered trademark), and ZigBee (registered trademark), or a combination thereof.

[0035] The oral scanner 110 can exchange information and / or data, such as 2D image data, 3D oral structure model data, etc., with the system 120. The oral scanner 110 and the system 120 can be physically separated as shown in the figure, but are not limited thereto. For example, the oral scanner 110 and the system 120 can be integrated into one computing device.

[0036] The system 120 can perform 3D oral structure modeling by analyzing at least two 2D image data or stereo images acquired from the oral scanner 110. To perform such functions, the system 120 can correspond to a computing device including a processor (e.g., CPU, GPU, etc.) capable of performing image processing and 3D modeling, and a memory capable of storing 2D image data or 3D oral structure model data. In one embodiment, the system 120 can include a communication unit 122, a control unit 124, and a display unit 126 as shown in the figure. The communication unit 122 can be configured to transmit / receive information and / or data to / from the oral scanner 110. Specifically, the communication unit 122 can transmit a command signal of the control unit 124 to the oral scanner 110 and can receive image information of the target oral structure from the oral scanner 110.

[0037] The control unit 124 may control the oral cavity scanner 110 to capture an image of the target oral cavity structure. Specifically, the control unit 124 may control a light source unit (e.g., 220 in FIG. 2) installed in the oral cavity scanner 110 to irradiate light toward at least one of a plurality of optical systems. The control unit 124 may also control an image sensor unit (e.g., 260 in FIG. 2) installed in the oral cavity scanner 110 to detect light reflected by at least one of a plurality of optical systems. The control unit 124 may control the image sensor unit to obtain two stereo images from the detected light images. The control unit 124 may control the display unit 126 to display the two stereo images obtained from the image sensor unit. The control unit 124 may also control the display unit 126 to visualize 3D oral cavity structure model data calculated from the two stereo images.

[0038] The display unit 126 may display information and / or data transmitted from the oral scanner 110 or the control unit 124 as an image. In this case, the image displayed on the display unit 126 may include two stereo images or an image of a 3D oral structure model. In one embodiment, the display unit 126 may include a display panel device such as an LED display, an OLED display, an LCD display, a touch display, etc.

[0039] 2 is a perspective view of an oral cavity scanner 200 according to an embodiment of the present disclosure. As shown in FIG. 2, the oral cavity scanner 200 may include a case 210, a light source unit 220, a first optical system 240, second optical systems 230 and 250, and an image sensor unit 260.

[0040] The case 210 forms the exterior of the oral cavity scanner 200 and may be configured to accommodate the light source unit 220, the first optical system 240, the second optical systems 230 and 250, and the image sensor unit 260 therein. As shown in Fig. 2, the case 210 may be in the form of a trapezoidal box extending in any one length direction, but is not limited thereto. For example, the case 210 may be formed in a rectangular parallelepiped, cylindrical, streamlined, or any other shape suitable for insertion into the oral cavity.

[0041] The opening 212 may be formed at one end of the case 210. Specifically, the opening 212 may include an opening formed at one end of the case 210. In this case, the opening of the opening 212 may be configured so that light generated or reflected inside the case 210 can be irradiated to the outside and external light can be introduced into the case 210. In one embodiment, the opening 212 may be configured to be located at the innermost part of the oral cavity when the oral cavity scanner 200 is inserted into the oral cavity.

[0042] The light source unit 220 may be configured to irradiate light toward the opening 212. In this case, the light irradiated from the light source unit 220 may correspond to pattern light or structured light. The light pattern may be a linear pattern, a dot pattern, or a pattern of any shape. When the pattern light is irradiated onto an object 270 such as a tooth in an oral cavity, the pattern may be deformed due to the three-dimensional structure of the surface of the object 270. Therefore, deformation or position information of the pattern associated with the surface of the object 270 may be used to identify and model the three-dimensional structure of the object 270.

[0043] The light source unit 220 may be disposed at the other end of the case 210. Specifically, the light source unit 220 may be accommodated and disposed at the other inner end of the case 210 opposite to one end of the case 210 in which the opening 212 is formed. For example, the light source unit 220 may be fixedly disposed at an upper portion of the other inner end of the case 210.

[0044] In an embodiment, the light source unit 220 may be disposed at one end of the case 210, but is not limited thereto. For example, the light source unit 220 may be disposed at any intermediate point between one end and the other end of the case 210. That is, the light source unit 220 may be disposed at any position in the case 210 that can easily irradiate light toward the opening 212. In an embodiment, the light source unit 220 may be disposed at an appropriate distance away from the first reflecting unit 230 for easy scanning. For example, the light source unit 220 may be disposed as close as possible to the first reflecting unit 230.

[0045] The first optical system 240 may be configured to reflect light emitted from the light source unit 220 toward the subject 270, and to reflect light reflected from the subject 270 toward the light source unit 220 or the second optical system 230, 250. The first optical system 240 may include at least one reflecting unit. For example, the first optical system 240 may be at least one mirror. In one embodiment, the first optical system 240 may be disposed in or around the opening 212. For example, the first optical system may be fixedly disposed on an inner surface of the opening 212.

[0046] The second optical systems 230 and 250 may be configured to reflect light reflected from the first optical system 240. Specifically, the second optical systems 230 and 250 may reflect the light reflected from the first optical system 240 toward the image sensor unit 260. In this case, the second optical systems 230 and 250 may reflect the light one or more times.

[0047] The second optical systems 230 and 250 may be disposed between the light source unit 220 and the first optical system 240. Specifically, the light source unit 220 and the first optical system 240 may be fixedly disposed at both ends of the internal space of the case 210, and the second optical systems 230 and 250 may be fixedly disposed at any position therebetween.

[0048] In one embodiment, a gap (or optical path) is formed in the center of the second optical system 230, 250, so that light emitted from the light source unit 220 can pass through the gap and reach the first optical system 240. In another embodiment, if no gap is formed in the center of the second optical system 230, 250, the light emitted from the light source unit 220 can reach the first optical system 240 without passing through the second optical system 230, 250.

[0049] 2, the second optical system 230, 250 may include a first reflecting unit 230 and a second reflecting unit 250. The first reflecting unit 230 may be configured to reflect light reflected from the first optical system 240. The first reflecting unit 230 may be fixedly disposed at an upper portion of the inside of the case 210. In one embodiment, the first reflecting unit 230 may include two reflecting surfaces 232, 234. The two reflecting surfaces 232, 234 may reflect the light reflected from the first optical system 240 toward the second reflecting unit 250. In addition, a gap is formed between the two reflecting surfaces 232, 234, so that the light irradiated from the light source unit 220 may reach the first optical system 240 through the gap.

[0050] The second reflecting unit 250 may be configured to reflect the light reflected by the first reflecting unit 230 toward the image sensor unit 260. The second reflecting unit 250 may be fixedly disposed at the inner lower part of the case 210. In one embodiment, the second reflecting unit 250 may include two reflective surfaces 252 and 254. The two reflective surfaces 252 and 254 may reflect the light reflected from the first reflecting unit 230 toward the image sensor unit 260.

[0051] In one embodiment, the positions and / or directions of the two reflecting surfaces 252, 254 of the second reflecting unit 250 may be appropriately set so that two images of the subject 270 reflected by the two reflecting surfaces 252, 254 of the second reflecting unit 250 and detected by the image sensor unit 260 do not overlap. For example, two images detected by the image sensor unit 260 from the light reflected by the two reflecting surfaces 252, 254 of the second reflecting unit 250 may each include one image of the subject 270. In this case, the positions and / or directions of the two reflecting surfaces 252, 254 may be set so that the two images of the subject 270 detected by the image sensor unit 260 do not overlap.

[0052] In one embodiment, a driving unit for adjusting the angle of the first optical system 240 or the second optical system 230, 250 may not be installed inside the case 210. In this case, since there is no need to place other electronic or mechanical components in the area where the first optical system 240 and the second optical system 230, 250 are arranged inside the case, the components inside the case can be densely arranged. Therefore, since the optimal structure of the case 210 can be designed based on the dense structure of the first optical system 240 and the second optical system 230, 250, it is possible to realize an oral cavity scanner 200 that is free to perform scanning operations inside the oral cavity and has a small volume.

[0053] The orientation of a normal vector of each of the reflective surfaces 232 and 234 of the first reflector 230 and the orientation of a normal vector of each of the reflective surfaces 232 and 234 of the second reflector 250 may be appropriately adjusted so that light reflected from the object 270 can be guided to the image sensor unit 260. In one embodiment, a dihedral angle formed between the infinite planes of each of the reflective surfaces 232 and 234 of the first reflector 230 may correspond to a minor angle, i.e., an angle smaller than 180 degrees, and a dihedral angle formed between the infinite planes of each of the reflective surfaces 252 and 254 of the second reflector 250 may correspond to a reflex angle, i.e., an angle larger than 180 degrees. In another embodiment, a dihedral angle formed between the infinite planes of each of the reflective surfaces 232 and 234 of the first reflector 230 may correspond to a reflex angle, and a dihedral angle formed between the infinite planes of each of the reflective surfaces 252 and 254 of the second reflector 250 may correspond to a minor angle.

[0054] The image sensor unit 260 may be configured to detect light reflected from the second optical system 230, 250. In one embodiment, the image sensor unit 260 may be configured to obtain two stereo images from the light reflected from the second optical system 230, 250. Specifically, the image sensor unit 260 may obtain two images of light reflected by the two reflecting surfaces 252, 254 of the second reflecting unit 250. In this manner, since the oral cavity scanner 200 includes the second optical system 230, 250 having a plurality of reflecting surfaces 232, 234, 252, 254, two stereo images can be obtained with only one image sensor unit 260. The two stereo images obtained from the image sensor unit 260 may be used for 3D oral cavity structure modeling performed by the processor thereafter.

[0055] In one embodiment, the image sensor unit 260 may be disposed at the other end of the case 210. Specifically, the image sensor unit 260 may be accommodated and disposed at the other end of the inside of the case 210 to face one end of the case 210 in which the opening 212 is formed. For example, the image sensor unit 260 may be fixedly disposed at a lower part of the inside of the case 210 adjacent to the light source unit 220.

[0056] Although it has been described above that the first reflecting unit 230 is fixed to the upper part of the inside of the case 210 and the second reflecting unit 250 is fixed to the lower part of the inside of the case 210, the present invention is not limited thereto. For example, the first reflecting unit 230 may be fixed to the lower part of the inside of the case 210 and the second reflecting unit 250 may be fixed to the upper part of the inside of the case 210. In this case, the light source unit 220 may be fixed to the lower part of the other end of the inside of the case 210, and the image sensor unit 260 may be fixed to the upper part of the inside of the case 210 adjacent to the light source unit 220.

[0057] 3 is a perspective side view of an oral cavity scanner 200 according to an embodiment of the present disclosure. Among the components illustrated in FIG. 3, those corresponding to the components illustrated in FIG. 2 will not be described.

[0058] In one embodiment, light may be emitted from the light source unit 220 and pass through the gap of the first reflecting unit 230. The light that passes through the gap of the first reflecting unit 230 may be reflected toward the subject by the first optical system 240. In this case, the light may pass through an opening formed on one side of the opening 212. The light reflected from the subject may be reflected toward the first reflecting unit 230 by the first optical system 240. The light reflected by the first reflecting unit 230 may be reflected toward the image sensor unit 260 by the second reflecting unit 250.

[0059] Additionally, the oral cavity scanner 200 may obtain an image of a subject using light irradiated from an additional light source other than the light source unit 220. For example, light irradiated from an additional light source installed in the oral cavity scanner 200 or an external additional light source may be reflected by the subject and reach the first optical system 240. The light reflected from the first optical system 240 may be sequentially reflected by the first reflecting unit 230 and the second reflecting unit 250 and reach the image sensor unit 260.

[0060] Fig. 4 is a perspective view of an oral cavity scanner 400 according to another embodiment of the present disclosure. Among the components illustrated in Fig. 4, those corresponding to the components illustrated in Fig. 2 will not be described. As illustrated in Fig. 4, the oral cavity scanner 400 may include a case 410, a light source unit 420, a first optical system 460, a second optical system 430, and an image sensor unit 470.

[0061] The second optical system 430 can reflect the light reflected from the first optical system 460 toward the image sensor unit 470. In this case, the second optical system 430 can reflect the light one or more times.

[0062] The second optical system 430 may be disposed between the light source unit 420 and the first optical system 460. Specifically, the light source unit 420 and the first optical system 460 may be fixedly disposed at both ends of the internal space of the case 410, respectively, and the second optical system 430 may be fixedly disposed at any position therebetween.

[0063] The second optical system 430 may include a pair of prisms, unlike the second optical systems 230 and 250 in Fig. 2. As shown in Fig. 4, the second optical system 430 may include a first prism 440 and a second prism 450.

[0064] In one embodiment, a gap (or optical path) is formed between the first prism 440 and the second prism 450, so that the light emitted from the light source unit 420 can pass through the gap and reach the first optical system 460. In another embodiment, if no gap is formed between the first prism 440 and the second prism 450, the light emitted from the light source unit 420 can reach the first optical system 460 without passing through the second optical system 430.

[0065] 4, the first prism 440 includes a pair of reflective surfaces 442, 444 facing each other, and the second prism 450 includes a pair of reflective surfaces 452, 454 facing each other. In one embodiment, the upper reflective surface 442 of the first prism 440 and the upper reflective surface 452 of the second prism 450 can respectively reflect light reflected from the first optical system 460 toward the lower reflective surface 444 of the first prism 440 and the lower reflective surface 454 of the second prism 450. In addition, the lower reflective surface 444 of the first prism 440 and the lower reflective surface 454 of the second prism 450 can respectively reflect light reflected from the upper reflective surface 442 of the first prism 440 and the upper reflective surface 452 of the second prism 450 toward the image sensor unit 470. Therefore, the light reflected by the first optical system 460 can reach the image sensor unit 470 by being reflected by a pair of mutually opposing reflecting surfaces 442 , 444 of the first prism 440 and a pair of mutually opposing reflecting surfaces 452 , 454 of the second prism 450 .

[0066] In one embodiment, the positions and / or directions of the lower reflecting surface 444 of the first prism 440 and the lower reflecting surface 454 of the second prism 450 may be appropriately set so that two images of the subject reflected by the two lower reflecting surfaces 444, 454 and detected by the image sensor unit 470 do not overlap. For example, two images detected by the image sensor unit 470 from the light reflected by the two lower reflecting surfaces 444, 454 may each include one image of the subject. In this case, the positions and / or directions of the two lower reflecting surfaces 444, 454 may be set so that the two images of the subject detected by the image sensor unit 470 do not overlap.

[0067] The orientation of normal vectors of the respective reflective surfaces 442, 444 of the first prism 440 and the respective reflective surfaces 452, 454 of the second prism 450 may be appropriately adjusted so that light reflected from an object can be guided to the image sensor unit 470. In one embodiment, a dihedral angle between an infinite plane of one reflective surface 442 of the first prism 440 and an infinite plane of one reflective surface 452 of the second prism 450 may correspond to a minor angle, and a dihedral angle between an infinite plane of the other reflective surface 444 of the first prism 440 and an infinite plane of the other reflective surface 454 of the second prism 450 may correspond to a preferential angle. In another embodiment, the dihedral angle between the infinite plane of one side reflecting surface 442 of the first prism 440 and the infinite plane of one side reflecting surface 452 of the second prism 450 may correspond to a major angle, and the dihedral angle between the infinite plane of the other side reflecting surface 444 of the first prism 440 and the infinite plane of the other side reflecting surface 454 of the second prism 450 may correspond to a minor angle.

[0068] As described above, by implementing the second optical system 430 using a pair of prisms (440, 450), the arrangement structure and design of the second optical system can be further optimized inside the case 410. That is, compared to implementing the second optical system using a plurality of reflectors or mirrors inside the case 410, by implementing the second optical system using a pair of prisms, the structure for arranging or fixing the second optical system inside the case 410 can be further simplified, and accordingly, the internal structure of the case 410 can be more dense.

[0069] Fig. 5 is a perspective side view of an oral cavity scanner 400 according to another embodiment of the present disclosure. Among the components illustrated in Fig. 5, those corresponding to the components illustrated in Fig. 2 and Fig. 4 will not be described.

[0070] In one embodiment, light is emitted from the light source unit 420 and can pass through a gap between the first prism 440 and the second prism 450. The light that passes through the gap can be reflected toward the object by the first optical system 460. In this case, the light can pass through an opening formed on one side of the opening 412. The light reflected from the object can be reflected toward the second optical system 430 by the first optical system 460. The light reflected by the upper reflecting surfaces of the first prism 440 and the second prism 450 can be reflected toward the image sensor unit 470 by the lower reflecting surfaces of the first prism 440 and the second prism 450.

[0071] Additionally, the oral cavity scanner 400 may obtain an image of a subject using light irradiated from an additional light source other than the light source unit 420. For example, light irradiated from an additional light source or an external light source installed in the oral cavity scanner 400 may be reflected by the subject and reach the first optical system 460. The light reflected from the first optical system 460 may be sequentially reflected by the upper and lower reflecting surfaces of the second optical system 430 and reach the image sensor unit 470.

[0072] The above-described preferred embodiments of the present invention have been disclosed for illustrative purposes, and various modifications, changes and additions may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications, changes and additions should be considered to fall within the scope of the appended claims.

[0073] The present invention is not limited to the above-described embodiments and the accompanying drawings, since various substitutions, modifications and alterations can be made by a person having ordinary knowledge in the technical field to which the present invention belongs without departing from the technical spirit of the present invention.

Claims

1. 1. An oral cavity scanner, comprising: A case having an opening formed at one end; a light source unit disposed at the other end of the case and configured to irradiate light toward the opening; a first optical system that is disposed at the opening and that reflects the light emitted from the light source unit toward a subject and reflects the light reflected from the subject toward the light source unit; a second optical system disposed between the light source unit and the first optical system and configured to reflect light reflected from the first optical system; and an image sensor unit that detects light reflected from the second optical system; The second optical system is a first reflecting portion configured to reflect light reflected from the first optical system; and a second reflecting portion configured to reflect the light reflected by the first reflecting portion toward the image sensor portion, An oral cavity scanner, wherein a gap is formed in the first reflecting unit, and the light emitted from the light source unit passes through the gap and reaches the first optical system.

2. The first reflecting portion includes two reflecting surfaces configured such that a dihedral angle between the respective infinite planes forms a minor angle, The oral cavity scanner according to claim 1 , wherein the second reflecting portion includes two reflecting surfaces configured such that a dihedral angle between the respective infinite planes forms a reflex angle.

3. The oral cavity scanner according to claim 2, wherein the positions and directions of the two reflective surfaces of the second reflective unit are set so that the two images of the subject reflected by the two reflective surfaces of the second reflective unit and detected by the image sensor unit do not overlap.

4. the first reflecting portion includes one side reflecting surface of a first prism and one side reflecting surface of a second prism, the second reflecting portion includes a second reflecting surface of the first prism facing the first reflecting surface of the first prism, and a second reflecting surface of the second prism facing the first reflecting surface of the second prism, The light emitted from the light source unit passes through a gap formed between the first prism and the second prism and reaches the first optical system, The oral cavity scanner according to claim 1 , wherein the light reflected by the first optical system is reflected by a pair of mutually opposing reflective surfaces of the first prism and a pair of mutually opposing reflective surfaces of the second prism to reach the image sensor unit.

5. 5. The oral cavity scanner according to claim 4, wherein a dihedral angle between the infinite plane of one side reflecting surface of the first prism and the infinite plane of one side reflecting surface of the second prism is a minor angle, and a dihedral angle between the infinite plane of the other side reflecting surface of the first prism and the infinite plane of the other side reflecting surface of the second prism is a reflex angle.

6. The oral cavity scanner according to claim 5, wherein the positions and directions of the other-side reflective surface of the first prism and the other-side reflective surface of the second prism are set so that two images of the subject reflected by the other-side reflective surface of the first prism and the other-side reflective surface of the second prism, respectively, and detected by the image sensor unit do not overlap.

7. The oral cavity scanner according to claim 1 , wherein the light source unit is configured to emit patterned light or structured light.

8. The image sensor unit detects two stereo images from the image of the light reflected from the second optical system.

13. The oral cavity scanner of claim 1, configured to acquire oral images.

9. 1. An oral cavity scanner, comprising: A case having an opening formed at one end; a light source unit disposed at the other end of the case and configured to irradiate light toward the opening; a first optical system that is disposed at the opening and that reflects light emitted from the light source unit toward a subject and reflects light reflected from the subject toward the light source unit; a second optical system disposed between the light source unit and the first optical system and configured to reflect light reflected from the first optical system; and an image sensor unit that detects light reflected from the second optical system; The second optical system is a first reflecting portion configured to reflect light reflected from the first optical system; and a second reflecting portion configured to reflect the light reflected by the first reflecting portion toward the image sensor portion, The first reflecting portion includes two reflecting surfaces configured such that a dihedral angle between the respective infinite planes forms a minor angle, The second reflecting portion includes two reflecting surfaces configured such that a dihedral angle between the respective infinite planes forms a reflex angle.

10. The oral cavity scanner according to claim 9, wherein the positions and directions of the two reflective surfaces of the second reflective unit are set so that the two images of the subject reflected by the two reflective surfaces of the second reflective unit and detected by the image sensor unit do not overlap.

11. 1. An oral cavity scanner, comprising: A case having an opening formed at one end; a light source unit disposed at the other end of the case and configured to irradiate light toward the opening; a first optical system that is disposed at the opening and that reflects light emitted from the light source unit toward a subject and reflects light reflected from the subject toward the light source unit; a second optical system disposed between the light source unit and the first optical system and configured to reflect light reflected from the first optical system; and an image sensor unit that detects light reflected from the second optical system; The second optical system is a first reflecting portion configured to reflect light reflected from the first optical system; and a second reflecting portion configured to reflect the light reflected by the first reflecting portion toward the image sensor portion, The first reflecting portion includes two reflecting surfaces configured such that a dihedral angle between the respective infinite planes forms a reflex angle; The second reflecting portion includes two reflecting surfaces configured such that a dihedral angle between the respective infinite planes forms a minor angle.

12. The oral cavity scanner according to claim 11, wherein the positions and directions of the two reflective surfaces of the second reflective unit are set so that the two images of the subject reflected by the two reflective surfaces of the second reflective unit and detected by the image sensor unit do not overlap.

13. 1. An oral cavity scanner, comprising: A case having an opening formed at one end; a light source unit disposed at the other end of the case and configured to irradiate light toward the opening; a first optical system that is disposed at the opening and that reflects light emitted from the light source unit toward a subject and reflects light reflected from the subject toward the light source unit; a second optical system disposed between the light source unit and the first optical system and configured to reflect light reflected from the first optical system; and an image sensor unit that detects light reflected from the second optical system; the second optical system includes a first prism and a second prism; The light emitted from the light source unit passes through a gap formed between the first prism and the second prism and reaches the first optical system, the light reflected by the first optical system is reflected by a pair of opposing reflecting surfaces of the first prism and a pair of opposing reflecting surfaces of the second prism to reach the image sensor unit, An oral scanner configured such that a dihedral angle between the infinite plane of one side reflecting surface of the first prism and the infinite plane of one side reflecting surface of the second prism forms a preferential angle, and a dihedral angle between the infinite plane of the other side reflecting surface of the first prism and the infinite plane of the other side reflecting surface of the second prism forms a minor angle.

14. The oral cavity scanner according to claim 13, wherein the positions and directions of the other-side reflective surface of the first prism and the other-side reflective surface of the second prism are set so that two images of the subject reflected by the other-side reflective surface of the first prism and the other-side reflective surface of the second prism, respectively, and detected by the image sensor unit do not overlap.

15. 1. An oral cavity scanner, comprising: A case having an opening formed at one end; a light source unit disposed at the other end of the case and configured to irradiate light toward the opening; a first optical system that is disposed at the opening and that reflects light emitted from the light source unit toward a subject and reflects light reflected from the subject toward the light source unit; a second optical system disposed between the light source unit and the first optical system and configured to reflect light reflected from the first optical system; and an image sensor unit that detects light reflected from the second optical system; the second optical system includes a first prism and a second prism; The light emitted from the light source unit passes through a gap formed between the first prism and the second prism and reaches the first optical system, the light reflected by the first optical system is reflected by a pair of opposing reflecting surfaces of the first prism and a pair of opposing reflecting surfaces of the second prism to reach the image sensor unit, An oral scanner configured such that a dihedral angle between the infinite plane of one side reflecting surface of the first prism and the infinite plane of one side reflecting surface of the second prism forms a minor angle, and a dihedral angle between the infinite plane of the other side reflecting surface of the first prism and the infinite plane of the other side reflecting surface of the second prism forms a preferential angle.

16. The oral cavity scanner according to claim 15, wherein the positions and directions of the other-side reflective surface of the first prism and the other-side reflective surface of the second prism are set so that two images of the subject reflected by the other-side reflective surface of the first prism and the other-side reflective surface of the second prism, respectively, and detected by the image sensor unit do not overlap.

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