Oral cavity digital measurement equipment and control method thereof

Abstract

The invention provides oral cavity digital measurement equipment and a control method thereof, the oral cavity digital measurement equipment comprises a light source, a projection lens and a scanning head reflector, the projection lens projects a modulation coding pattern generated by the light source to the scanning head reflector, and the scanning head reflector reflects the modulation coding pattern to a target object; the camera lens receives the image of the target object reflected by the scanning head reflecting mirror, and the image sensor receives and processes the image of the target object. In the embodiment of the invention, the light source is controlled to generate the modulation coding pattern, the light beam containing the modulation coding pattern is irradiated to the target object through the optical assembly and is finally fed back to the image sensor for information processing, so that the three-dimensional information and the color information of the target object are obtained, and the problems of complex structure, low cost and the like of oral cavity measurement equipment are solved. The problems of large size and low modulation rate in the prior art are solved, an illumination light path is simplified, and the modulation rate and the measurement precision of equipment are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an oral digital measurement device and a control method thereof. BACKGROUND

[0002] Traditional oral digital impression devices are mostly based on digital light processing (DLP) projection technology, which encodes three color channels of a digital light processing projector into different phase-shifted sinusoidal fringe patterns, and then extracts the depth and color information of the measured target through triangulation.

[0003] The DLP-based structured light projection optical machine has a complex structure and a bulky structure, often occupying a large space, resulting in a large volume of the oral digital impression device. In addition, due to the frequency limitation of the digital micromirror, the maximum projection speed of the projected strict sinusoidal fringe can only reach 100 Hz, which cannot meet the increasing application requirements of the oral digital impression device. Therefore, a new structured light projection method is urgently needed to reduce the volume and mass of the projection system while improving the measurement speed and accuracy. SUMMARY

[0004] The embodiments of the present application provide an oral digital measurement device and a control method thereof to solve the problems of complex structure, large volume and low modulation rate of the measurement device, and improve the measurement accuracy of the device.

[0005] The embodiments of the present application provide an oral digital measurement device, which comprises:

[0006] A light source comprising at least one display screen, the display screen comprising a plurality of light emitting units; the display screen generates a modulated coded pattern;

[0007] A projection lens and a scanning head mirror, the projection lens projects the modulated coded pattern to the scanning head mirror, and the scanning head mirror reflects the modulated coded pattern to a target object;

[0008] A camera lens and an image sensor, the camera lens receives the image of the target object reflected by the scanning head mirror, and the image sensor receives and processes the image of the target object.

[0009] Optionally, in the display screen, the plurality of light emitting units comprise first color light emitting units, second color light emitting units and third color light emitting units, or the plurality of light emitting units comprise first color light emitting units, second color light emitting units, third color light emitting units and fourth color light emitting units.

[0010] The first color light emitting unit emits red light, the second color light emitting unit emits green light, the third color light emitting unit emits blue light, and the fourth color light emitting unit emits white light.

[0011] Optionally, the display screen comprises a plurality of single-color display screens, and the plurality of single-color display screens comprise a first waveband display screen, a second waveband display screen, and a third waveband display screen.

[0012] The first waveband display screen emits red light, the second waveband display screen emits green light, and the third waveband display screen emits blue light.

[0013] The light source further comprises a beam combining element, and the beam combining element at least combines the red light, the green light, and the blue light.

[0014] Optionally, the beam combining element comprises a beam combining prism, and the first waveband display screen, the second waveband display screen, and the third waveband display screen are respectively located on three sides of the beam combining prism.

[0015] Optionally, the beam combining element comprises a first dichroic mirror and a second dichroic mirror.

[0016] The second waveband display screen, the first dichroic mirror, and the second dichroic mirror are sequentially arranged, the third waveband display screen is located on the opposite side of the first dichroic mirror from the second waveband display screen, and the third waveband display screen is located on the opposite side of the second dichroic mirror from the first waveband display screen.

[0017] Optionally, the beam combining element further comprises a third dichroic mirror, and the third dichroic mirror is located on a side of the second dichroic mirror away from the first dichroic mirror.

[0018] The single-color display screen further comprises a fourth waveband display screen, the fourth waveband display screen emits infrared light or ultraviolet light, and the fourth waveband display screen is located on the opposite side of the third dichroic mirror from the first waveband display screen.

[0019] Optionally, the modulation coding pattern comprises at least one of a grating pattern, a mesh pattern, and a dot matrix pattern.

[0020] Optionally, the modulation coding pattern comprises a first modulation coding pattern and a second modulation coding pattern that are time-sequentially transmitted, and the first modulation coding pattern and the second modulation coding pattern have different light emitting wavebands.

[0021] The first modulation coding pattern and the second modulation coding pattern have the same pattern shape.

[0022] Optionally, in the display screen, the plurality of light emitting units are arranged according to the shape of the modulation coding pattern.

[0023] In a second aspect, an embodiment of the present application provides a control method of the oral digital measurement device based on the first aspect, and the control method of the oral digital measurement device comprises:

[0024] The luminous brightness of the plurality of light emitting units in the display screen in the light source is controlled so that the display screen generates a modulation coding pattern.

[0025] The technical scheme of the embodiment of the present application generates a modulation coding pattern by controlling a light source, irradiates a light beam containing the modulation coding pattern onto a target object through an optical assembly, then generates a modulation coding pattern containing image information of the target object, images the pattern into an image sensor through a camera lens, and the image sensor processes the image information to obtain three-dimensional information and color information of the target object, thereby eliminating extra optical elements, solving the problems of complex structure, large volume and low modulation rate of the oral cavity measurement device, simplifying the illumination light path, and improving the modulation rate and measurement accuracy of the device. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A structural schematic diagram of an oral cavity digital measurement device is provided for the embodiment of the present application.

[0027] Figure 2 A structural schematic diagram of an oral cavity digital measurement device is provided for the embodiment of the present application.

[0028] Figure 3 And 4 Two light emitting unit pixel distribution structure diagrams are provided for the embodiment of the present application.

[0029] Figure 5 A light source generation mode structure diagram is provided for the embodiment of the present application.

[0030] Figure 6 Another light source generation mode structure diagram is provided for the embodiment of the present application.

[0031] Figure 7 Still another light source generation mode structure diagram is provided for the embodiment of the present application.

[0032] Figure 8 A shape schematic diagram of a modulation coding pattern is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0034] Figure 1 A structural schematic diagram of an oral cavity digital measurement device is provided for the embodiment of the present application. The device is suitable for oral cavity detection, for example, Figure 1As shown, the specific structure of the device includes a light source 100, a projection lens 130, and a scanning head mirror 140, a camera lens 160, and an image sensor 170.

[0035] The light source 100 includes at least one display screen 110 (as an example, the light source 100 includes one display screen 110 in this embodiment), and the display screen 110 includes a plurality of light emitting units 120. Figure 1 The display screen 110 generates a modulated coded pattern, the projection lens 130 projects the modulated coded pattern to the scanning head mirror 140, and the scanning head mirror 140 reflects the modulated coded pattern to the target object 150, which may include teeth or oral cavity, for example. The camera lens 160 receives the image of the target object 150 reflected by the scanning head mirror 140, and the image sensor 170 receives and processes the image of the target object 150.

[0036] Specifically, in this embodiment, by controlling the light emitting of the plurality of light emitting units 120 in the light source 100, the display screen 110 is controlled to quickly switch to display a pattern with a specific rule designed in advance, and these generated patterns are the modulated coded pattern. Then the light beam containing the modulated coded pattern emitted by the display screen 110 reaches the projection lens 130, and the projection lens 130 projects the light beam containing the modulated coded pattern onto the scanning head mirror 140.

[0037] The light source 100 can include a red LED light source 10, a green LED light source 11, and a blue LED light source 12. The red LED light source 10, the green LED light source 11, and the blue LED light source 12 can be combined into white light by two dichroic mirrors 13. The white light can be homogenized by a fly-eye lens 14. The light beam can be focused on the surface of a digital micromirror 17 by a mirror 15 and a focusing lens 16. The digital micromirror 17 can produce different images by continuously changing the reflection angle. The open-state light beam of the digital micromirror 17 can be reflected to a projection lens 19 by a total reflection prism 18. The closed-state light beam can be transmitted to a light trap. The projection lens 19 can project the image to an object 20 to be measured. The light beam reflected by the object 20 to be measured can enter the mirror 15. The image of the object 20 to be measured can enter an imaging lens 21 by adjusting the reflection angle. The imaging lens 21 can image the image of the object 20 to be measured to a detector 22. The detector 22 can process the image of the object 20 to be measured.

[0038] Figure 2 FIG. 1 is a schematic diagram of a digital dental measurement device according to an embodiment of the present application. The digital dental measurement device can include a light source 100, a display screen 110, a scanning head mirror 140, a camera lens 160, and an image sensor 170. Figure 2 The light source 100 can include a red LED light source 10, a green LED light source 11, and a blue LED light source 12. The red LED light source 10, the green LED light source 11, and the blue LED light source 12 can be combined into white light by two dichroic mirrors 13. The white light can be homogenized by a fly-eye lens 14. The light beam can be focused on the surface of a digital micromirror 17 by a mirror 15 and a focusing lens 16. The digital micromirror 17 can produce different images by continuously changing the reflection angle. The open-state light beam of the digital micromirror 17 can be reflected to a projection lens 19 by a total reflection prism 18. The closed-state light beam can be transmitted to a light trap. The projection lens 19 can project the image to an object 20 to be measured. The light beam reflected by the object 20 to be measured can enter the mirror 15. The image of the object 20 to be measured can enter an imaging lens 21 by adjusting the reflection angle. The imaging lens 21 can image the image of the object 20 to be measured to a detector 22. The detector 22 can process the image of the object 20 to be measured.

[0039] The prior art scheme contains many optical elements and generates the coded pattern by using a digital micro-mirror, which has a complex structure, a large volume and a high cost. In the embodiment of the present application, the coded pattern is directly generated by using a light source, and no additional optical element is needed, so the structure is simple.

[0040] In the embodiment, the modulated coded pattern is generated by controlling the light source, the light beam containing the modulated coded pattern is irradiated on the target object 15 through the optical assembly, then the modulated coded pattern containing the image information of the target object 15 is generated, the pattern is imaged into the image sensor 170 through the camera lens 160, the image sensor 170 processes the image information, and then the three-dimensional information and color information of the target object 150 are obtained. The additional optical element is omitted, the problems of complex structure, large volume and low modulation rate of the oral cavity measuring device are solved, the illumination light path is simplified, and the modulation rate and measuring accuracy of the device are improved.

[0041] It should be noted that, in the structure shown in Figure 2 In the structure shown in the figure, the red LED light source 10, the green LED light source 11 and the blue LED light source 12 are single LEDs, and in some cases, in order to increase the brightness, the red LED light source 10, the green LED light source 11 and the blue LED light source 12 can be respectively provided with multiple LEDs. However, the digital micro-mirror 17 plays a role in generating a pattern, and the digital micro-mirror 17 is provided, and the dichroic mirror 13, the fly-eye lens 14, the reflector 15, the focusing lens 16, the digital micro-mirror 17 and the total reflection prism 18 are also provided to adapt to the digital micro-mirror 17, which leads to a complex structure, a large volume and a high cost of the oral digital measuring device. The embodiment of the present application directly generates the modulated coded pattern by using the light source. The optical elements such as the fly-eye lens 14, the reflector 15, the focusing lens 16, the digital micro-mirror 17 and the total reflection prism 18 are omitted.

[0042] Optionally, Figure 3 And 4 Two kinds of light-emitting unit pixel distribution structure diagrams provided by the embodiment of the present application are shown. For example, referring to Figure 3 In the display screen 110, the multiple light-emitting units 120 include the first color light-emitting unit 121, the second color light-emitting unit 122 and the third color light-emitting unit 123.

[0043] Alternatively, referring to Figure 4 The multiple light-emitting units 120 include the first color light-emitting unit 121, the second color light-emitting unit 122, the third color light-emitting unit 123 and the fourth color light-emitting unit 124.

[0044] The first color light emitting unit 121 emits red light, the second color light emitting unit 122 emits green light, the third color light emitting unit 123 emits blue light, and the fourth color light emitting unit 124 emits white light.

[0045] Specifically, referring to Figure 3 , the display screen 110 includes a plurality of light emitting units 120, each of which is a different LED lamp and can emit light of different colors. The first color light emitting unit 121 is used to emit red light, the second color light emitting unit 122 emits green light, and the third color light emitting unit 123 emits blue light. The light source is composed of such light source pixels, which is a basic way. Each color light emitting unit can be controlled individually to produce different shapes and color sequences, ensuring that the oral digital measurement device can obtain 3D data and color information of the teeth.

[0046] Referring to Figure 4 , the plurality of light emitting units 120 in the display screen 110 are based on the color combination of the light emitting units described above Figure 3 The fourth color light emitting unit 124 is added, which is used to emit white light. Compared with the combination of red light, blue light, and green light, the addition of white light irradiation significantly improves the brightness and energy efficiency of the display screen 110 based on the irradiation of red light, blue light, and green light. For example, when it is necessary to enhance the brightness of the irradiation, the brightness of the first color light emitting unit 121, the second color light emitting unit 122, and the third color light emitting unit 123 can not be increased simultaneously, and only the irradiation brightness of the fourth color light emitting unit 124 can be increased, thereby reducing power consumption.

[0047] In the present embodiment, the plurality of light emitting units 120 can have different color light emitting combination modes. By controlling different color light emitting units to emit light, different colors and patterns are formed. By adding the fourth color light emitting unit 124, the brightness of the measurement can be improved, and the power consumption of the device can be reduced.

[0048] The light emitted by the display screen 110 can include not only the combination of three-color light source pixels, but also the combination of single-color light emitted by a plurality of different single-color display screens. Details are explained below.

[0049] Optionally, Figure 5 A light source generation mode structure diagram is provided for the embodiment of the present application. For example, Figure 5As shown, the display screen 110 includes a plurality of monochrome display screens, including a first waveband display screen 111, a second waveband display screen 112, and a third waveband display screen 113; the first waveband display screen 111 emits red light, the second waveband display screen 112 emits green light, and the third waveband display screen 113 emits blue light; the light source 100 further includes a beam combining element, which at least combines the red light, the green light, and the blue light.

[0050] Specifically, in addition to the pixel combination method, the light source can also be formed by combining single-color light. The first waveband display screen 111, the second waveband display screen 112, and the third waveband display screen 113 emit red light, green light, and blue light, respectively. The beam combining element is used to mix different light beams to form a light beam. The light emitted by the three waveband display screens 110 is combined to form white light, which can better obtain the texture and color information of the surface of the target object 150.

[0051] Optionally, continuing to refer to Figure 5 , the beam combining element includes a beam combining prism 180, and the first waveband display screen 111, the second waveband display screen 112, and the third waveband display screen 113 are respectively located on three sides of the beam combining prism 180.

[0052] Specifically, the beam combining element can be a beam combining prism 180, which can combine light beams from different surfaces and mix different light beams. The first waveband display screen 111, the second waveband display screen 112, and the third waveband display screen 113 are arranged on three sides of the beam combining prism 180. For example, Figure 5 As shown, the first waveband display screen 111 is arranged on the upper side of the beam combining prism 180, the second waveband display screen 112 is arranged on the left side of the beam combining prism 180, and the third waveband display screen 113 is arranged on the lower side of the beam combining prism 180. The red light emitted by the first waveband display screen 111, the green light emitted by the second waveband display screen 112, and the blue light emitted by the third waveband display screen 113 are combined into a white light beam by the beam combining prism 180 for subsequent illumination.

[0053] In this embodiment, the beam combining prism 180 combines light beams of different colors emitted by the three monochrome display screens to produce white light, which can improve the illumination brightness and better detect the texture and color information on the target object 150.

[0054] In addition to the above-mentioned method of simultaneously combining three different colors of light using the beam combining prism 180, different colors of light can also be combined step by step.

[0055] Optionally, Figure 6 Another light source generation method structure diagram is provided for the embodiment of the present application. For example,Figure 6 As shown, the beam combining element includes a first dichroic mirror 181 and a second dichroic mirror 182; the second waveband display screen 112, the first dichroic mirror 181 and the second dichroic mirror 182 are sequentially arranged, the third waveband display screen 113 is located on the opposite side of the first dichroic mirror 181 from the second waveband display screen 112, and the third waveband display screen 113 is located on the opposite side of the second dichroic mirror 182 from the first waveband display screen 111.

[0056] Specifically, the green light and the blue light emitted by the second waveband display screen 112 and the third waveband display screen 113 are combined by the first dichroic mirror 181, and the combined light is combined with the red light emitted by the first waveband display screen 111 by the second dichroic mirror 182, to form white light. The white light formed performs area illumination, so that the camera lens 160 clearly obtains the texture and color information of the target object 150.

[0057] In the embodiment, the light emitted by the single-color display screen is combined step by step by using the first dichroic mirror 182 and the third dichroic mirror 183, thereby improving the flexibility of the structure when the light is combined into white light. At the same time, the optical structure is simplified, and the complexity of the internal structure of the measuring device is reduced.

[0058] Optionally, Figure 7 Another light source generation structure diagram is provided for the embodiment of the present application. For example, Figure 7 As shown, the beam combining element further includes a third dichroic mirror 183, the third dichroic mirror 183 is located on the side of the second dichroic mirror 182 away from the first dichroic mirror 181; the single-color display screen further includes a fourth waveband display screen 114, the fourth waveband display screen 114 emits infrared light or ultraviolet light, and the fourth waveband display screen 114 is located on the opposite side of the third dichroic mirror 183 from the first waveband display screen 111.

[0059] Specifically, on the basis of only three colors of light being combined, infrared light or ultraviolet light is also added for combining. After red light, green light and blue light are combined by the first dichroic mirror 181 and the second dichroic mirror 182 to generate white light, the generated white light is combined with infrared light or ultraviolet light emitted by the fourth waveband display screen 114 through the third dichroic mirror 183, and the generated light beam can measure more target information. For example, when the fourth waveband display screen 114 emits infrared light, an infrared light source is formed to perform area illumination. In this case, the camera lens 160 can obtain an infrared image of the target object 150. When the target object 150 is a tooth, the caries area will exhibit stronger light scattering under the irradiation of infrared waves, so that the received image is slightly brighter than the healthy area. According to the received image information, interproximal caries information can be obtained to determine whether the tooth is damaged to form caries. When the fourth waveband display screen 114 emits ultraviolet light, an ultraviolet light source is formed to perform area illumination. In this case, when the target object 150 is a tooth, the camera lens 160 can obtain a fluorescent image of the target object. Because the tooth will produce fluorescence under the irradiation of ultraviolet light, the fluorescence intensity and quality of the caries area will change. According to the received image information, the distribution information of dental plaque or caries can be obtained.

[0060] In the embodiment, by adding the irradiation of infrared light and ultraviolet light, the digital oral measurement device can detect and identify the lesion area such as caries, cracks or dental calculus while scanning the three-dimensional shape of the tooth during measurement, thereby improving the efficiency of oral detection.

[0061] In other embodiments, the light source in the digital oral measurement device can emit both infrared light and ultraviolet light.

[0062] Optionally, Figure 8 A shape diagram of a modulation coding pattern is provided for the embodiment of the present application. For example, as shown in Figure 8 The modulation coding pattern includes at least one of a grating pattern, a mesh pattern and a dot matrix pattern.

[0063] Specifically, by controlling the on-off state of the light finally projected by the light source 100 for detecting the target object 150, different modulation coding patterns can be formed. The modulation coding pattern can have different shape options. When this modulation coding pattern is projected onto the irregular surface of the oral tooth, it will be distorted. The camera lens 160 captures this distorted pattern and transmits it to the image sensor 170. By decoding the distortion through an algorithm, the three-dimensional coordinate information of the tooth surface can be calculated.

[0064] Reference Figure 8a) of FIG. 1, the modulation coding pattern is a grating pattern, and the shape of the light source 100 is striped by controlling the on-off state of each light emitting unit 120 in the light source 100, and then the grating modulation coding pattern is obtained. The grating pattern can be relatively slow in measurement, and multiple phase-shifted patterns need to be projected, which is suitable for phase measurement technology. Referring to Figure 8 b) of FIG. 1, the modulation coding pattern is a grating pattern, and the shape of the light source 100 is netted by controlling the on-off state of each light emitting unit 120 in the light source 100, and then the net modulation coding pattern is obtained. Referring to Figure 8 c) of FIG. 1, the modulation coding pattern is a dot array pattern, and the shape of the light source 100 is dot arrayed by controlling the on-off state of each light emitting unit 120 in the light source 100, and then the dot array modulation coding pattern is obtained. The dot array pattern is suitable for dynamic scanning, and a large number of three-dimensional data points can be obtained through high-density dot arrays, so as to capture fine features such as tooth grooves and edges, and the decoding algorithm is required to be high. Referring to Figure 8 d) of FIG. 1, the modulation coding pattern is also a dot array pattern, which is different from Figure 8 c) of FIG. 1 in that the pattern is a sparse dot array pattern, and the generation is also by controlling the on-off state of each light emitting unit 120 in the light source 100. At the same time, the generated modulation coding pattern can be any combination of the above patterns.

[0065] In this embodiment, different modulation coding patterns can be used for different scanning targets, so as to obtain accurate and detailed three-dimensional features in the oral cavity, improve the measurement accuracy and resolution, and expand the measurement range and application scenarios.

[0066] In other embodiments, the light emitting units can also be arranged according to the shape of the modulation coding pattern. The light emitting units are arranged at the positions of the patterns in the modulation coding pattern, and the light emitting units are not arranged at the blank positions in the modulation coding pattern. The blank positions in the modulation coding pattern are, for example, the gaps between adjacent grating stripes.

[0067] Optionally, the modulation coding pattern includes a first modulation coding pattern and a second modulation coding pattern which are sent in time sequence, the first modulation coding pattern and the second modulation coding pattern have different light emitting wave bands, and the first modulation coding pattern and the second modulation coding pattern have the same pattern shape.

[0068] Specifically, the plurality of light emitting units 120 in the display screen 100 form modulation coding patterns at a very fast speed, and each modulation coding pattern is not emitted at the same time, but is emitted in time, is emitted alternately, is circulated, and adjacent two first coding patterns and second coding patterns are formed by light of different wave bands, that is, different colors, but the first modulation coding pattern and the second modulation coding pattern are the same shape. By sending patterns of different colors, different characteristic information of the target object 150 can be detected and identified.

[0069] In the embodiment, by continuously and alternately emitting modulation coding patterns of the same shape and different colors on the target object 150, a plurality of characteristic information of the target object 150 can be obtained, the compatibility and concealment are enhanced, and the detection efficiency and rate are improved.

[0070] Optionally, in the display screen 110, the plurality of light emitting units 120 are arranged according to the shape of the modulation coding pattern.

[0071] Specifically, according to different modulation coding patterns, the plurality of light emitting units 120 in the corresponding display screen 110 also arrange the brightness according to the shape of the modulation coding pattern. The brightness of the light emitting unit 120 is the same as the shape of the finally presented coding pattern.

[0072] Based on the same inventive concept, the embodiment of the present application provides a control method of the oral digital measurement device, the control method is based on the oral digital measurement device in the above-mentioned embodiment, and the control method comprises the following steps:

[0073] The light emitting brightness of the plurality of light emitting units 120 in the display screen 110 in the light source 100 is controlled, so that the display screen 110 generates a modulation coding pattern.

[0074] Specifically, when the display screen 110 generates different modulation coding patterns, the light emitting brightness and the light emitting position of the plurality of light emitting units 120 in the display screen 110 are controlled and adjusted to realize this. Different light emitting sequences and brightness correspond to different modulation coding patterns.

[0075] In the embodiment, by controlling the plurality of light emitting units 120 in the display screen 110 to generate different modulation coding patterns, the use of additional optical elements is omitted, not only the system volume is effectively reduced, the manufacturing cost is reduced, but also the adaptability and deployment flexibility of the device in different application scenarios are enhanced.

[0076] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications, combinations and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. An oral digital measuring device, characterized in that, The light source comprises at least one display screen, and the display screen comprises a plurality of light emitting units. The display screen generates a modulated coded pattern. A projection lens and a scanning head mirror, the projection lens projects the modulated coded pattern to the scanning head mirror, and the scanning head mirror reflects the modulated coded pattern to the target object. A camera lens and an image sensor, the camera lens receives the image of the target object reflected by the scanning head mirror, and the image sensor receives and processes the image of the target object. In the display screen, the plurality of light emitting units comprise first color light emitting units, second color light emitting units, and third color light emitting units, or the plurality of light emitting units comprise first color light emitting units, second color light emitting units, third color light emitting units, and fourth color light emitting units.

2. The dental digital measuring apparatus according to claim 1, characterized by The first color light emitting units emit red light, the second color light emitting units emit green light, the third color light emitting units emit blue light, and the fourth color light emitting units emit white light. The display screen comprises a plurality of monochromatic display screens, and the plurality of monochromatic display screens comprise first waveband display screens, second waveband display screens, and third waveband display screens.

3. The dental digital measuring apparatus according to claim 1, characterized by The first waveband display screens emit red light, the second waveband display screens emit green light, and the third waveband display screens emit blue light. The light source further comprises a beam combining element, and the beam combining element at least combines red light, green light, and blue light. The beam combining element comprises a beam combining prism, and the first waveband display screens, the second waveband display screens, and the third waveband display screens are respectively located on three sides of the beam combining prism.

4. The dental digital measuring apparatus according to claim 3, characterized in that, The beam combining element comprises a first dichroic mirror and a second dichroic mirror.

5. The dental digital measuring apparatus according to claim 3, characterized by The second waveband display screens, the first dichroic mirror, and the second dichroic mirror are sequentially arranged, the third waveband display screens are located on opposite sides of the first dichroic mirror relative to the second waveband display screens, and the third waveband display screens are located on opposite sides of the second dichroic mirror relative to the first waveband display screens. The beam combining element further comprises a third dichroic mirror, and the third dichroic mirror is located on a side of the second dichroic mirror away from the first dichroic mirror.

6. The dental digital measuring apparatus according to claim 5, characterized in that, The monochromatic display screens further comprise fourth waveband display screens, and the fourth waveband display screens emit infrared light or ultraviolet light, and the fourth waveband display screens are located on opposite sides of the third dichroic mirror relative to the first waveband display screens. The modulated coded pattern comprises at least one of a grating pattern, a mesh pattern, and a dot matrix pattern.

7. The dental digital measuring apparatus according to claim 1, characterized by The modulated coded pattern comprises a first modulated coded pattern and a second modulated coded pattern that are sequentially transmitted, and the first modulated coded pattern and the second modulated coded pattern have different light emitting wavebands.

8. The dental digital measuring apparatus according to claim 1, characterized by The first modulated coded pattern and the second modulated coded pattern have the same pattern shape. In the display screen, the plurality of light emitting units are arranged according to the shape of the modulated coded pattern.

9. The dental digital measuring apparatus according to claim 1, characterized by The light emitting brightness of the plurality of light emitting units in the display screen in the light source is controlled so that the display screen generates a modulated coded pattern.

10. A control method of an oral digital measuring apparatus according to claim 1, characterized by, ​ ​

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