CN214906773U

CN214906773U - Oral cavity scanner

Info

Publication number: CN214906773U
Application number: CN202120495257.4U
Authority: CN
Inventors: 顾铁; 凌严
Original assignee: Hefei Shiya Technology Co ltd
Current assignee: Vision Technology Co ltd
Priority date: 2021-03-08
Filing date: 2021-03-08
Publication date: 2021-11-30
Anticipated expiration: 2031-03-08

Abstract

The embodiment of the utility model discloses oral cavity scanner. The oral scanner comprises a light source module, a beam splitting module, a focusing module, an imaging module and a processing module; the light source module comprises a silicon-based display panel, and the silicon-based display panel is used for providing an illumination light beam; the input end of the beam splitting module is used for receiving the illumination light beam, and the first output end of the beam splitting module is used for transmitting the illumination light beam to the focusing module; the focusing module is used for converging the illumination light beams to an object to be detected and transmitting imaging light beams returned by the object to be detected to a first output end of the beam splitting module; the second output end of the beam splitting module is used for transmitting the imaging light beam to the imaging module; the processing module is connected with the imaging module and is used for converting the two-dimensional image acquired by the imaging module into a three-dimensional image. The embodiment of the utility model provides an oral cavity scanner realizes the three-dimensional scanning formation of image of tooth and other tissues in the oral cavity based on confocal imaging principle, and the light path is simple moreover, small, facilitate the use.

Description

Oral cavity scanner

Technical Field

The embodiment of the utility model provides a relate to medical instrument technique, especially relate to an oral cavity scanner.

Background

With the continuous improvement of living standard of people, the oral diseases are more and more paid attention to. In clinical oral diagnosis and repair, oral impressions are an important information storage source, and almost every patient needs to print one or more impressions. The doctor can understand the treatment effect and improve the accuracy of examination, diagnosis and treatment by comparing multiple models before, during and after treatment, and the dental technician needs to determine the shape of the denture prosthesis according to the impression.

At present, the digital impression technology which is easy to operate, high in precision and convenient to store is more and more emphasized by the oral medical field, and more students and companies invest a great deal of energy and financial resources to research. The digital data set corresponding to the tooth may be obtained by scanning using Computer Aided Design (CAD) techniques and/or Computer Aided Manufacturing (CAM) techniques. For example, a (male) physical tooth model in the form of a plaster model or a (female) physical tooth model in the form of an impression may be scanned or imaged using x-ray, computed tomography, magnetic resonance imaging, or laser scanning devices. Using the image data thus obtained, a computer model of the tooth or a portion thereof may be built up. However, such methods and apparatus are time consuming and more expensive than might be desirable.

The confocal imaging technology is a high and new imaging technology rapidly developed in recent ten years, the principle of the confocal imaging technology is that point illumination and point confocal detection are realized by utilizing an illumination pinhole placed behind a light source and a detection pinhole placed in front of a detector, light emitted from the light source through the illumination pinhole is focused on a certain point of a sample focal plane, a light beam emitted by the point is imaged in the detection pinhole, any emitted light except the point is blocked by the detection pinhole, and the illumination pinhole and the detection pinhole are conjugated to an irradiated point or a detected point, so that the detected point is a confocal point. However, the existing confocal imaging equipment has large volume and complicated light path, is difficult to be applied to oral scanning and has high cost.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides an oral cavity scanner, this oral cavity scanner realize the three-dimensional scanning formation of image of tooth and other tissues in the oral cavity based on confocal imaging principle, and the light path is simple moreover, small, facilitate the use.

The embodiment of the utility model provides an oral scanner, which comprises a light source module, a beam splitting module, a focusing module, an imaging module and a processing module;

the light source module comprises a silicon-based display panel, and the silicon-based display panel is used for providing an illumination light beam;

the input end of the beam splitting module is used for receiving the illumination light beam, and the first output end of the beam splitting module is used for transmitting the illumination light beam to the focusing module;

the focusing module is used for converging the illumination light beam to an object to be detected and transmitting an imaging light beam returned by the object to be detected to a first output end of the beam splitting module;

the second output end of the beam splitting module is used for transmitting the imaging light beam to the imaging module;

the processing module is connected with the imaging module and is used for converting the two-dimensional image acquired by the imaging module into a three-dimensional image.

Optionally, the light source module, the beam splitting module and the focusing module are sequentially arranged along a first direction coaxial axis, and the imaging module and the beam splitting module are arranged along a second direction coaxial axis; alternatively, the first and second electrodes may be,

the light source module and the beam splitting module are sequentially arranged along the first direction on the same optical axis, and the imaging module, the beam splitting module and the focusing module are arranged along the second direction on the same optical axis;

wherein the first direction and the second direction intersect.

Optionally, the optical system further comprises a light beam turning module disposed at an output end of the focusing module, and the light beam turning module is configured to change a transmission direction of the illumination light beam or the imaging light beam.

Optionally, the beam-turning module includes a plane mirror, a cambered mirror, or a grating.

Optionally, the silicon-based display panel includes a silicon-based liquid crystal display panel or a silicon-based organic light emitting display panel.

Optionally, the silicon-based display panel is a monochrome silicon-based display panel or a color silicon-based display panel.

Optionally, the beam splitting module includes a polarization adjusting unit and a polarization beam splitting unit;

the polarization adjusting unit is used for adjusting the polarization state of the illumination light beam and/or the imaging light beam;

the polarization beam splitting unit is used for outputting the illumination light beam to the focusing module and outputting the imaging light beam to the imaging module.

Optionally, the focusing module includes a zooming unit, and the zooming unit is configured to change a focal plane of the focusing module when measuring different positions of the object to be measured, so that the illumination light beam converges to the different positions of the object to be measured.

Optionally, the imaging module includes a CMOS image sensor or a CCD image sensor.

Optionally, the optical system further comprises a housing, the light source module, the beam splitting module, the focusing module, the imaging module and the processing module are disposed in the housing, and the housing is provided with a light beam input/output window;

the oral cavity scanner further comprises a heating module, and the heating module is used for heating the light beam input and output window.

The embodiment of the utility model provides an oral scanner, including light source module, beam splitting module, focus module, imaging module and processing module; the light source module comprises a silicon-based display panel, and an illuminating light beam is provided through the silicon-based display panel, and the silicon-based display panel can be modulated into a preset illuminating pattern according to needs, so that structures such as a mask plate rotating wheel and a Langqi grating are avoided, and the structure of the light source module is simplified; the input end of the beam splitting module is used for receiving the illumination light beam, the first output end of the beam splitting module is used for transmitting the illumination light beam to the focusing module, and the second output end of the beam splitting module is used for transmitting the imaging light beam to the imaging module, so that the illumination light beam and the imaging light beam are transmitted; the illumination light beams are converged to an object to be detected through the focusing module, and imaging light beams returned by the object to be detected are transmitted to a first output end of the beam splitting module; the processing module converts the two-dimensional image acquired by the imaging module into a three-dimensional image, so that three-dimensional scanning imaging of teeth and other tissues in the oral cavity is realized, and the optical path is simple, small in size and convenient to use.

Drawings

Fig. 1 is a schematic structural diagram of an oral scanner according to an embodiment of the present invention;

fig. 2 is a schematic view of a static pattern according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another oral scanner provided in an embodiment of the present invention;

fig. 4 to fig. 6 are schematic structural diagrams of another oral cavity scanner according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a beam splitting module according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another oral scanner provided in an embodiment of the present invention;

fig. 9 is a schematic structural diagram of another oral scanner provided in an embodiment of the present invention;

fig. 10 is a schematic flowchart of an oral cavity scanning method according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present invention are described in terms of the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. In case of conflict, the features of the different embodiments may be combined with each other and the resulting solution is also within the scope of the present invention.

Fig. 1 is a schematic structural diagram of an oral scanner according to an embodiment of the present invention. Referring to fig. 1, the oral scanner provided in the present embodiment includes a light source module 10, a beam splitting module 20, a focusing module 30, an imaging module 40, and a processing module 50; the light source module 10 includes a silicon-based display panel 11, the silicon-based display panel 11 is used for providing an illumination beam a; the input end of the splitting module 20 is configured to receive the illumination light beam a, and the first output end of the splitting module 20 is configured to transmit the illumination light beam a to the focusing module 30; the focusing module 30 is configured to converge the illumination light beam a to the object 100 to be detected, and transmit the imaging light beam b returned by the object 100 to be detected to the first output end of the beam splitting module 20; a second output end of the beam splitting module 20 is used for transmitting the imaging light beam b to the imaging module 40; the processing module 50 is connected to the imaging module 40, and the processing module 40 is configured to convert the two-dimensional image acquired by the imaging module 40 into a three-dimensional image.

Wherein, the object 100 that awaits measuring includes tooth and other tissues in the people oral cavity, and when carrying out oral cavity scanning, the oral cavity of patient is put to oral cavity scanner's scanner head, and it can be understood that, oral cavity scanner's size is the smaller, and patient's experience is better, and the large-size scanner head often has big scanning window simultaneously, and the data collection efficiency is higher, according to the size of actual demand design scanner head during the concrete implementation. In the existing oral scanner structure, for monochromatic scanning, a mask plate rotating wheel, a chessboard pattern mask plate or a Langqi grating is generally adopted to modulate light beams output by a light source; for multi-color scanning, a white light source and a color wheel or a plurality of single-color light sources and a beam combining component are generally adopted to modulate an output light beam, so that the oral cavity scanner is large in size and is not beneficial to the application of the oral cavity scanner. In this embodiment, the light source module 10 includes a silicon-based display panel 11, and the silicon-based display panel 11 is a display panel with a small size and a very high resolution, and can display an illumination shape to be achieved, such as a checkerboard shape, as required. In specific implementation, the silicon-based display panel 11 may optionally include a silicon-based liquid crystal display panel or a silicon-based organic light emitting display panel, and may be a monochrome silicon-based display panel or a color silicon-based display panel, which may be flexibly selected according to actual needs in specific implementation. Because the silicon-based display panel 11 has the advantages of small volume, high resolution and the like, the optical path structure can be effectively simplified, and the volume of the oral scanner is reduced. The beam splitting module 20 is configured to split different light beams, transmit the illumination light beam a to the focusing module 30, and converge the illumination light beam a to the object 100 to be measured after passing through the focusing module 30; the beam splitting module 20 is further configured to transmit a light beam returned by the object 100 to be measured to the imaging module 40 for imaging, where the imaging light beam b may be reflected light or scattered light of the object 100 to be measured, and may also be fluorescent light, phosphorescent light, etc. emitted by a substance coated on the surface of the object 100 to be measured. Optionally, the imaging module 40 includes a CMOS image sensor or a CCD image sensor, and the implementation may be selected according to actual conditions. The processing module 50 may include a computer for converting two-dimensional imaging into three-dimensional imaging, and further, the processing module 50 may further integrate a CAD or CAM function inside, and process the denture on site after completing the internal scan of the oral cavity, and then the doctor may directly install the denture in the oral cavity of the patient, thereby improving the working efficiency of the doctor.

In one embodiment, the scanning of the object under test may be accomplished using a time-varying pattern that varies over time. The specific process can be as follows: when a time-varying pattern is applied, a single sub-scan can be obtained by collecting a large number of two-dimensional (2D) images at different positions of the focal plane and with different instances of the pattern. When the focal plane coincides with the scanning surface at a single pixel location, the pattern will be projected onto a surface point that is in focus and has high contrast, thereby causing large variations or amplitudes of the pixel values over time. An individual setting of the focal plane can thus be identified for each pixel, for which each pixel is in focus. That is, each time the silicon-based display panel 11 displays an illumination pattern, the illumination beam is sequentially transmitted through the beam splitting module 20 and the focusing module 30 and then focused on an object to be measured (for example, a tooth), then the imaging beam returned by the object to be measured is sequentially transmitted through the focusing module 30 and the beam splitting module 20 and then transmitted to the imaging module 40, so as to obtain a 2D image at a position, and the contrast information-focal plane position of each 2D image is converted into 3D surface information.

In another embodiment, a static pattern may also be used to scan the object to be measured, and fig. 2 is a schematic diagram of a static pattern provided in an embodiment of the present invention, that is, the static pattern may be similar to a checkerboard shape, where black filling indicates no light emission and white indicates light emission. Imaging with a stationary pattern is similar to a time-varying pattern. The 2D to three dimensional (3D) conversion of the image data may be performed in a number of ways known in the art. That is, the 3D surface structure of the object to be measured can be determined by finding the plane corresponding to the maximum light oscillation amplitude for each sensor element or group of sensor elements in the imaging module while recording the light amplitudes for a series of different focal planes. Alternatively, the focal plane is adjusted in equal steps from one end of the scan area to the other. Alternatively, the focal plane may be moved over a range large enough to at least coincide with the surface of the scanned object.

According to the technical scheme of the embodiment of the utility model, the silicon-based display panel provides the illuminating light beam, and the silicon-based display panel can be modulated into the preset illuminating pattern according to the requirement, so that the structures such as a mask plate rotating wheel and a Langqi grating are avoided, and the structure of the light source module is simplified; the input end of the beam splitting module is used for receiving the illumination light beam, the first output end of the beam splitting module is used for transmitting the illumination light beam to the focusing module, and the second output end of the beam splitting module is used for transmitting the imaging light beam to the imaging module, so that the illumination light beam and the imaging light beam are transmitted; the illumination light beams are converged to an object to be detected through the focusing module, and imaging light beams returned by the object to be detected are transmitted to a first output end of the beam splitting module; the processing module converts the two-dimensional image acquired by the imaging module into a three-dimensional image, so that three-dimensional scanning imaging of teeth and other tissues in the oral cavity is realized, and the optical path is simple, small in size and convenient to use.

Optionally, with reference to fig. 1, in a certain embodiment, the light source module 10, the beam splitting module 20, and the focusing module 30 are arranged along a first direction x, and are arranged along a second direction y, and are arranged along a common axis; or, fig. 3 is a schematic structural diagram of another oral scanner according to an embodiment of the present invention, referring to fig. 3, the light source module 10 and the beam splitting module 20 are sequentially arranged along a common optical axis x in a first direction, and the imaging module 40, the beam splitting module 20 and the focusing module 30 are arranged along a common optical axis y in a second direction; wherein the first direction x and the second direction y intersect.

It is understood that the optical path structures shown in fig. 1 and 3 are merely illustrative, and in other embodiments, the beam splitting module 20 may include an optical fiber structure, such as a three-port fiber optic circulator, which is a multi-port non-reciprocal optical device, with light propagating in only one direction. The method specifically comprises the following steps: if the signal is input from the port 1, the signal is output from the port 2; and the signal is input from the port 2 and is output from the port 3, and the volume of the oral cavity scanner can be further reduced by adopting the optical fiber device because the optical fiber can be bent.

Fig. 4 to fig. 6 are schematic structural diagrams of another oral cavity scanner according to an embodiment of the present invention. Optionally, referring to fig. 4 to 6, the oral scanner provided in this embodiment further includes a beam bending module 60 disposed at the output end of the focusing module 30, and the beam bending module 60 is configured to change the transmission direction of the illumination beam a or the imaging beam b.

It is understood that, in the above embodiment, the light beam emitted from the focusing module 30 is directly transmitted to the object 100 to be measured, so that the light-emitting window of the oral cavity scanner is located in the length direction of the scanner, which may cause inconvenience in operation in some cases. By providing the beam folding module 60, the transmission direction of the light beam can be changed, for example, folded by 90 °, to improve the convenience of the oral scanner.

Alternatively, the beam-steering module 60 may include a plane mirror (fig. 4), a curved mirror (fig. 5), or a grating (fig. 6). In specific implementation, a lens for correcting optical imaging may be further disposed at the incident end and/or the exit end of the beam folding module 60, and in specific implementation, the lens may be disposed according to actual requirements.

Optionally, the beam splitting module includes a polarization adjusting unit and a polarization beam splitting unit; the polarization adjusting unit is used for adjusting the polarization state of the illumination light beam and/or the imaging light beam; the polarization beam splitting unit is used for outputting the illumination light beam to the focusing module and outputting the imaging light beam to the imaging module.

Fig. 7 is a schematic structural diagram of a beam splitting module according to an embodiment of the present invention. Referring to fig. 7, the beam splitting module includes a polarization adjusting unit 21 and a polarization beam splitting unit 22, the polarization adjusting unit 21 includes a polarizer 211 and a quarter wave plate 212, the polarization beam splitting unit 22 includes a polarization beam splitter 221, the polarizer 211 modulates the illumination beam a into p-polarized light, the p-polarized light is transmitted through the polarization beam splitter 221, and is converted into circularly polarized light through the quarter wave plate 212, the imaging light returned through the object to be measured (not shown in fig. 6) is converted into s-polarized light when passing through the quarter wave plate 212, and the s-polarized light is reflected to the imaging module after passing through the polarization beam splitter 221. The energy loss can be reduced by utilizing the polarization beam splitting mode, and the imaging effect is improved.

Fig. 8 is a schematic structural diagram of another oral scanner according to an embodiment of the present invention. Alternatively, referring to fig. 8, the focusing module 30 includes a zooming unit 31, and the zooming unit 31 is configured to change a focal plane of the focusing module 30 when measuring different positions of the object 100 to be measured, so that the illumination light beams a converge to different positions of the object 100 to be measured.

In specific implementation, the zooming unit 31 may include a plurality of convex lenses and a plurality of concave lenses, one convex lens and one concave lens are shown in fig. 8 as an example, and a part of the convex lenses and/or the concave lenses may move along the optical axis to achieve zooming.

Fig. 9 is a schematic structural diagram of another oral scanner according to an embodiment of the present invention. Optionally, referring to fig. 9, the oral scanner provided in this embodiment further includes a housing 70, the light source module 10, the beam splitting module 20, the focusing module 30, the imaging module 40, and the processing module 50 are disposed in the housing 70, and the housing 70 is provided with a light beam input/output window 701; the oral cavity scanner further comprises a heating module 80, the heating module 80 is used for heating the light beam input and output window 701, the temperature difference between the light beam input and output window 701 and the inside of the oral cavity of a human body can be reduced by arranging the heating module 80, the light beam input and output window 701 is prevented from being fogged, and the imaging effect of the oral cavity scanner is improved.

Fig. 10 is a schematic flow chart of an oral cavity scanning method provided in an embodiment of the present invention, where the oral cavity scanning method provided in this embodiment is executed by using any one of the oral cavity scanners provided in the above embodiments, including:

and S110, outputting the illumination light beams by the silicon-based display panel.

The silicon-based display panel can comprise a silicon-based liquid crystal display panel or a silicon-based organic light-emitting display panel, can be a single-color silicon-based display panel or a color silicon-based display panel, and can be flexibly selected according to actual requirements in specific implementation.

Step S120, the input end of the beam splitting module receives the illumination light beam, and the first output end of the beam splitting module transmits the illumination light beam to the focusing module.

Step S130, the focusing module converges the illumination light beam to the object to be detected, and transmits the imaging light beam returned by the object to be detected to the first output end of the beam splitting module.

And step S140, the second output end of the beam splitting module transmits the imaging light beam to the imaging module.

The beam splitting module is used for separating different light beams, transmitting the illumination light beams to the focusing module, and converging the illumination light beams to an object to be measured after passing through the focusing module; the beam splitting module is also used for transmitting a light beam returned by the object to be detected to the imaging module for imaging, wherein the imaging light beam can be reflected light or scattered light of the object to be detected, and can also be fluorescence, phosphorescence and the like emitted by a substance coated on the surface of the object to be detected.

And S150, converting the two-dimensional image acquired by the imaging module into a three-dimensional image by the processing module.

The processing module can comprise a computer and is used for converting two-dimensional imaging into three-dimensional imaging, furthermore, the processing module can be internally integrated with a CAD (computer-aided design) or CAM (computer-aided manufacturing) function, false teeth are machined on site after internal scanning of the oral cavity is completed, and then a doctor can directly install the false teeth into the oral cavity of a patient, so that the working efficiency of the doctor is improved.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. An oral cavity scanner is characterized by comprising a light source module, a beam splitting module, a focusing module, an imaging module and a processing module;

2. The oral scanner of claim 1, wherein the light source module, the beam splitting module, and the focusing module are coaxially arranged in sequence along a first direction, and the imaging module and the beam splitting module are coaxially arranged along a second direction; alternatively, the first and second electrodes may be,

wherein the first direction and the second direction intersect.

3. The oral scanner of claim 1, further comprising a beam steering module disposed at an output of the focusing module, the beam steering module configured to change a transmission direction of the illumination beam or the imaging beam.

4. The oral scanner of claim 3, wherein the beam-steering module comprises a plane mirror, a curved mirror, or a grating.

5. The oral scanner of claim 1, wherein the silicon-based display panel comprises a silicon-based liquid crystal display panel or a silicon-based organic light emitting display panel.

6. The oral scanner of claim 1, wherein the silicon-based display panel is a monochrome silicon-based display panel or a color silicon-based display panel.

7. The oral scanner of claim 1, wherein the beam splitting module comprises a polarization adjustment unit and a polarizing beam splitting unit;

8. The oral scanner of claim 1, wherein the focusing module comprises a zoom unit for changing a focal plane of the focusing module when measuring different positions of the object to be measured, so that the illumination beam converges to the different positions of the object to be measured.

9. The oral scanner of claim 1, wherein the imaging module comprises a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge Coupled Device (CCD) image sensor.

10. The oral scanner according to any one of claims 1 to 9, further comprising a housing, wherein the light source module, the beam splitting module, the focusing module, the imaging module and the processing module are disposed in the housing, and the housing is provided with a light beam input and output window;