Stereoscopic scanning device

Abstract

The invention provides three-dimensional scanning equipment which is used for detecting the surface profile of an object. The stereoscopic scanning equipment comprises an illumination light source, a first aperture, a reference pattern generating piece and a light receiver. The illumination light source is used for outputting illumination light. The reference pattern generator generates a reference pattern using the illumination light and projects the reference pattern to the object via the first aperture. The light receiver receives a detection pattern from the object to obtain a surface profile by using a difference between the reference pattern and the detection pattern. The first aperture is provided with two opposite first side edges and two opposite second side edges, and the first length of one of the two first side edges is larger than the second length of one of the two second side edges.

Description

Technical Field

[0001] The present invention relates to a 3D scanning device, and more particularly to a 3D scanning device capable of taking both scanning depth of field and image brightness into consideration. Background Art

[0002] With the advancement of technology, optical scanning technology has been widely used in various fields, such as intraoral scanners. In traditional optical intraoral scanners, a light source projects illumination light onto a grating. The grating pattern generated by the grating is projected onto the target object through a first aperture. The target object then reflects the grating pattern through a second aperture to be received by an image capturer. The first and second apertures of traditional optical intraoral scanners are often designed as non-elliptical pinholes or elliptical pinholes. The non-elliptical pinhole design affects the amount of light that can be collected by the image capturer, resulting in poor image quality. While the elliptical pinhole design can improve the amount of light that can be collected by the image capturer, the brightness of the detected image is still insufficient.

[0003] Therefore, it is necessary to design a new type of 3D scanning device to overcome the above-mentioned defects. Summary of the Invention

[0004] An object of the present invention is to provide a 3D scanning device that can be used in low-light environments and can balance scanning depth of field and image brightness.

[0005] To achieve the above objectives, the present invention provides a 3D scanning device for detecting the surface profile of an object. The 3D scanning device includes: an illumination light source for outputting illumination light; a first aperture; a reference pattern generator for generating a reference pattern using the illumination light and projecting the reference pattern onto the object through the first aperture; and a light receiver for receiving a detection pattern from the object and obtaining the surface profile by utilizing the difference between the reference pattern and the detection pattern. The first aperture has two opposing first sides and two opposing second sides, and a first length of one of the two first sides is greater than a second length of one of the two second sides.

[0006] Preferably, the ratio of the first length to the second length is between 1:1 and 1:5, the two first sides are of equal or unequal lengths, and the two second sides are of equal or unequal lengths.

[0007] Preferably, the first side and the second side are straight lines.

[0008] Preferably, the first side is an arc or a turning line, and the sum of the internal angles of the first aperture is less than 360 degrees.

[0009] Preferably, the reference pattern has a plurality of stripes arranged adjacent to each other, and an extension direction of the first side of the first aperture intersects with an arrangement direction of the plurality of stripes.

[0010] Preferably, the included angle between the extension direction of the first side and the arrangement direction is ninety degrees, or the extension direction is perpendicular to the arrangement direction and has an allowable angular error.

[0011] Preferably, the reference pattern has a plurality of stripes arranged adjacent to each other, and the first side of the first aperture extends along an extension direction of the plurality of stripes to maintain a scanning depth of field of the 3D scanning device and increase brightness of the detection pattern.

[0012] Preferably, the reference pattern has a plurality of stripes arranged adjacent to each other, and the second side of the first aperture is shortened along the arrangement direction of the plurality of stripes, thereby maintaining the brightness of the detection pattern and increasing the scanning depth of field of the 3D scanning device.

[0013] Preferably, the stereoscopic scanning device further includes a second aperture, and the first aperture and the second aperture are respectively quadrilateral apertures; the second aperture has two opposite third sides and two opposite third sides, the third length of one of the two third sides is greater than the fourth length of one of the two fourth sides, and the ratio of the third length to the fourth length is between 1:1 and 1:1.15.

[0014] Preferably, a difference between a first ratio formed by the first side and the second side of the first aperture and a second ratio formed by the third side and the fourth side of the second aperture is smaller than a predetermined threshold.

[0015] Preferably, a first angle between the first side and / or the second side of the first aperture and the reference pattern is the same as or similar to a second angle between the third side and / or the fourth side of the second aperture and the reference pattern.

[0016] The present invention also provides a 3D scanning device for detecting the surface contour of an object. The 3D scanning device includes: an illumination light source for outputting illumination light; a reference pattern generator for generating a reference pattern using the illumination light and projecting the pattern onto the object; a second aperture; and a light receiver for receiving a detection pattern from the object through the second aperture to obtain the surface contour using the difference between the reference pattern and the detection pattern. The second aperture has two opposing third sides and two opposing fourth sides, and a first length of one of the two third sides is greater than a second length of one of the two fourth sides.

[0017] Preferably, the second aperture is a quadrilateral aperture, the ratio of the first length to the second length is between 1:1 and 1:1.15, the two third sides are equal or unequal in length and the two fourth sides are equal or unequal in length, the third side is a straight line, an arc or a turning line, and the sum of the internal angles of the fourth aperture is less than 360 degrees.

[0018] The present invention also includes a 3D scanning device for detecting the surface profile of an object. The 3D scanning device includes: an illumination light source for outputting illumination light; a first polygonal aperture; a reference pattern generator for generating a reference pattern using the illumination light and projecting the reference pattern onto the object through the first polygonal aperture; and a light receiver for receiving a detection pattern from the object and obtaining the surface profile by utilizing the difference between the reference pattern and the detection pattern. The first polygonal aperture includes a first segment, a second segment, and a third segment adjacent to each other. The first segment and the third segment are respectively disposed on opposite sides of the second segment, and the area of ​​the second segment is smaller than that of the first segment and / or the third segment.

[0019] Preferably, the first polygonal aperture has two intersecting diagonals, and a length difference between the two diagonals is smaller than a predetermined threshold.

[0020] Preferably, the first section, the second section and the third section are adjacent to each other along the transverse direction, and a structural longitudinal dimension of the first section perpendicular to the transverse direction is greater than a structural longitudinal dimension of the second section perpendicular to the transverse direction.

[0021] Preferably, each side of the first polygonal aperture is an arc or a straight line.

[0022] Preferably, the ratio of the maximum structural transverse dimension to the minimum structural longitudinal dimension of the first polygonal aperture is between 1:1 and 1:5.

[0023] Preferably, the minimum structural longitudinal dimension of the second section is smaller than or equal to the minimum structural longitudinal dimension of the first section and / or the third section.

[0024] Preferably, the stereoscopic scanning device further includes a second polygonal aperture, the second polygonal aperture having a fourth segment, a fifth segment and a sixth segment adjacent to each other, the fourth segment and the sixth segment being respectively arranged on opposite sides of the fifth segment, the area of ​​the fifth segment being smaller than the area of ​​the fourth segment and / or the sixth segment; and the ratio of the maximum structural lateral dimension to the minimum structural longitudinal dimension of the second polygonal aperture is between 1:1 and 1:1.15.

[0025] Compared to existing technologies, the 3D scanning device provided in embodiments of the present invention is primarily designed for use as an optical impression-taking device in dentistry. Since a light source cannot be placed inside a patient's mouth, and medical personnel's use of external light sources to illuminate the oral cavity is also limited in effectiveness, improvements are needed to the optical system of the optical impression-taking device to enhance detection accuracy. Therefore, the 3D scanning device proposed in the present invention utilizes an aperture with a specially shaped aperture that significantly increases the amount of illumination light penetrating compared to an elliptical aperture. This maintains the depth of field required for scanning applications while also maintaining the desired brightness of the modeled image, thereby ensuring accurate and clear surface contours of the object. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. 4 is a schematic diagram of a 3D scanning device according to an embodiment of the present invention.

[0027] Figure 2 FIG. 1 is a schematic diagram of the appearance of a first aperture according to the first embodiment of the present invention.

[0028] Figure 3 FIG. 4 is a front view of the first aperture according to the first embodiment of the present invention.

[0029] Figure 4 FIG. 4 is a front view of a first aperture according to a second embodiment of the present invention.

[0030] Figure 5 FIG. 4 is a front view of a first aperture according to a third embodiment of the present invention.

[0031] Figure 6 FIG. 4 is a front view of a first aperture according to a fourth embodiment of the present invention.

[0032] Figure 7 FIG. 1 is a schematic diagram of the appearance of the first aperture and the second aperture according to the first embodiment of the present invention.

[0033] Figure 8 FIG. 4 is a schematic diagram showing the relationship among a reference pattern, a detection pattern, a first aperture, and a second aperture according to an embodiment of the present invention.

[0034] Figure 9 FIG. 4 is a front view of a first polygonal aperture according to a fifth embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to provide a further understanding of the purpose, structure, features and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0036] See also Figure 1 , Figure 1The figure is a schematic diagram of a 3D scanning device 10 according to an embodiment of the present invention. The 3D scanning device 10 is used to detect the surface contour of an object O. The 3D scanning device 10 can be an oral scanner or related medical equipment, and the object O can be a tooth or other target object, depending on the application requirements of the medical equipment. The 3D scanning device 10 can include an illumination light source 12, a reference pattern generator 14, a projection lens assembly 16, an imaging lens assembly 18, a first aperture 20, a second aperture 22, and a light receiver 24. The illumination light source 12 can output illumination light of various wavelength ranges; for example, the illumination light source 12 can be a blue light emitter, a combination of a blue light emitter, a green light emitter, and a red light emitter, a combination of a blue light emitter and a yellow light emitter, or a white light emitter, and the variations depend on design requirements.

[0037] The reference pattern generator 14 can be a digital micromirror device or a component with related functions. The illumination light source 12 outputs illumination light to the reference pattern generator 14, causing it to generate a reference pattern. The reference pattern is projected onto the reflector 26 via the projection path of the projection lens assembly 16 and the first aperture 20, and then reflected by the reflector 26 onto the object O. The light receiver 24 receives the detection pattern from the object O via the imaging path of the imaging lens assembly 18 and the second aperture 22, and uses the difference between the reference and detection patterns to determine the surface profile of the object O. The light receiver 24 can be a monochromatic light detector or a color light detector. The light receiver 24 can include a computing unit that directly analyzes the difference between the reference and detection patterns to determine the surface profile of the object O. The light receiver 24 can also include a transmission unit that transmits the detection pattern to an external computing module for difference analysis between the reference and detection patterns.

[0038] The projection lens assembly 16 is located between the illumination light source 12, the reference pattern generator 14, and the object O, and the imaging lens assembly 18 is located between the light receiver 24 and the object O. The projection lens assembly 16 and the imaging lens assembly 18 are each composed of multiple optical elements, and their possible variations are not listed and described separately here. The first aperture 20 can be regarded as an optical element of the projection lens assembly 16, or it can be an optical element independent of the projection lens assembly 16. The second aperture 22 can be regarded as an optical element of the imaging lens assembly 18, or it can be an optical element independent of the imaging lens assembly 18. The stereoscopic scanning device 10 of this embodiment respectively sets the first aperture 20 and the second aperture 22 in the projection path and the imaging path, but the actual application is not limited to this; for example, the stereoscopic scanning device 10 of the present invention can preferably set the first aperture 20 only in the projection path, or selectively set the second aperture 22 only in the imaging path.

[0039] The structural features of the first aperture 20 can be the same as or different from the structural features of the second aperture 22. The following description takes the first aperture 20 as an example and is also applicable to the second aperture 22. Figure 2 and Figure 3 , Figure 2 FIG. 2 is a schematic diagram of the appearance of the first aperture 20A according to the first embodiment of the present invention. Figure 3 This is a front view of the first aperture 20A of the first embodiment of the present invention. The first aperture 20A has two opposing first sides 28 and two opposing second sides 30, and the first length L1 of the first side 28 is greater than the second length L2 of the second side 30. An ellipse is defined as a moving point trajectory in a plane whose sum of distances to two fixed points is a constant, such as Figure 3 The first aperture 20A has a quadrilateral feature; if the first aperture 20A is compared to an ellipse, the second length L2 of the second side 30 is designed to be equal to the length of the minor axis of the ellipse, and the first length L1 of the first side 28 is designed to be equal to the length of the major axis of the ellipse.

[0040] Therefore, the length design of the first side 28 of the first aperture 20A can significantly increase the amount of light collected, and the length design of the second side 30 of the first aperture 20A can provide a better scanning depth of field, ensuring that the surface contour of the object O can be accurately and clearly obtained while maintaining the required brightness of the detection pattern. Figure 2 and Figure 3 As shown, the ratio of the first length L1 to the second length L2 is preferably in the range of 1:1 to 1:5, but practical applications are not limited thereto. For example, the ratio of the lengths of the long side and the short side of the second aperture 22 (i.e., corresponding to the first side 28 and the second side 30 of the first aperture 20A, respectively) is preferably in the range of 1:1 to 1:15. The first side 28 and the second side 30 of the first aperture 20A are both straight lines, and the two first sides 28 have the same length, and the two second sides 30 also have the same length.

[0041] See also Figure 4 , Figure 4This is a front view of a first aperture 20B according to a second embodiment of the present invention. The first aperture 20B may have two opposing first sides 28 and two opposing second sides 30, with the first length L1 of each first side 28 being greater than the second length L2 of each second side 30. The first aperture 20B also has quadrilateral characteristics. Comparing the first aperture 20B to an ellipse, the second length L2 of the second side 30 is designed to be equal to or approximately (e.g., slightly longer or shorter than) the length of the ellipse's minor axis, while the first length L1 of the first side 28 is designed to be equal to or approximately (e.g., slightly longer or shorter than) the length of the ellipse's major axis. In the second embodiment, the first length L1 of the upper first side 28a differs from the first length L1 of the lower first side 28b, but the difference is less than a predetermined threshold. The second length L2 of the right second side 30a differs from the second length L2 of the left second side 30b, with the difference less than a predetermined threshold. The actual value of the predetermined threshold depends on the overall size of the first aperture 20B and the design requirements of the 3D scanning device 10 , and will not be further described herein.

[0042] See also Figure 5 , Figure 5 This is a front view of a first aperture 20C according to a third embodiment of the present invention. The first aperture 20C may have two opposing first sides 28 and two opposing second sides 30, with the first length of each first side 28 being greater than the second length of each second side 30. The first aperture 20C has structural features similar to a quadrilateral, but the first sides 28 are designed as curved or inflection lines to form an aperture structure that is wider at both ends and narrower in the middle. For example, the upper first side 28a is a inflection line, and the lower first side 28b is a curved line. However, the line shapes of the first sides 28a and 28b can be interchanged, or both first sides 28 can be designed with the same line shape. In this way, the length design of the second sides 30 of the first aperture 20C still provides an optimal scanning depth of field, while the length design of the first side 28 further increases the amount of light collected, thereby improving the brightness of the detected pattern.

[0043] It is worth mentioning that the sum of the internal angles of the first aperture 20C is preferably less than 360 degrees, so that the first aperture 20C can form a pillow-shaped design with wide sides and narrow center to provide the desired depth of field effect. If the sum of the internal angles of the aperture exceeds 360 degrees, a hole structure with narrow sides and wide center will be formed. The center width of this hole structure is greater than the minor axis length of the ellipse, making it difficult to achieve the desired depth of field effect. In addition, the dotted rectangle in the first aperture 20C corresponds to Figure 2 The first aperture 20A shown is used to indicate that the length ratio of the first side 28 to the second side 30 of the first aperture 20C may be similar to the ratio of the long side to the short side of the first aperture 20A.

[0044] See also Figure 6 , Figure 6FIG4 is a front view of a first aperture 20D according to a fourth embodiment of the present invention. The first aperture 20D may have two opposite first sides 28 and two opposite second sides 30, and the first length of the first side 28 is greater than the second length of the second side 30. The dotted rectangular frame of the first aperture 20D corresponds to Figure 2 The illustrated first aperture 20A illustrates that the length ratio of the first side 28 to the second side 30 of the first aperture 20D can approximate the ratio of the long side to the short side of the first aperture 20A. The four corners of the dashed rectangular frame can be chamfered to make the structural features of the first aperture 20D more similar to an ellipse. In the fourth embodiment, the two first sides 28 can be equal or unequal in length, and the two second sides 30 can also be equal or unequal in length. Furthermore, the first sides 28 and second sides 30 can be straight lines, arcs, or inflection lines.

[0045] See also Figure 2 and Figure 7 , Figure 7 The diagram below illustrates the appearance of the first aperture 20A and the second aperture 22 according to the first embodiment of the present invention. As previously mentioned, the ratio of the first length L1 to the second length L2 of the first aperture 20A is preferably between 1:1 and 1:5, and the ratio of the lengths of the third side 32 to the fourth side 34 of the second aperture 22 is preferably between 1:1 and 1:1.15. Furthermore, the first aperture 20A and the second aperture 22 are preferably designed with similar structural features. Specifically, the difference between the first ratio of the first side 28 to the second side 30 of the first aperture 20A and the second ratio of the third side 32 to the fourth side 34 of the second aperture 22 is less than a predetermined threshold. The actual value of the predetermined threshold depends on the design requirements of the 3D scanning device 10 and will not be further described here.

[0046] See also Figure 1 、 Figure 7 and Figure 8 , Figure 8The diagram below illustrates the relationship between the reference pattern Pr, detection pattern Pd, first aperture 20, and second aperture 22 according to an embodiment of the present invention. The reference pattern Pr may include multiple adjacent stripes. The stripes of the reference pattern Pr extend along an extension direction Ds and are arranged along an arrangement direction Da. Therefore, the first side 28 has the same extension direction Ds and intersects with the arrangement direction Da. The stripes of the detection pattern Pd are deformed due to reflection from an object O. The first aperture 20 and the second aperture 22 are preferably arranged with their long sides and short sides aligned. Alternatively, the first aperture 20 may be configured such that the steering angle of the first aperture 20 relative to the extension direction Ds or arrangement direction Da of the reference pattern Pr is preferably the same as or similar to the steering angle of the second aperture 22 relative to the extension direction Ds' or arrangement direction Da' of the detection pattern Pd. In other words, the first angle formed by the first side 28 and / or the second side 30 of the first aperture 20 relative to one of the stripes of the reference pattern Pr (or its extending direction Ds) may be the same as or similar to the second angle formed by the third side 32 and / or the fourth side 34 of the second aperture 22 relative to one of the stripes of the reference pattern Pr (or its extending direction Ds).

[0047] The reference pattern Pr and the first aperture 20 (or the detection pattern Pd and the second aperture 22) are not located on the same reference plane. Figure 8 The first angle and the second angle are not marked. However, the present invention can also be defined as follows: the reference pattern Pr is along the projection path (i.e. Figure 8 When the reference pattern Pr is positioned near the first aperture 20 without rotation or deformation (i.e., the left dashed line in FIG. 8 ), the angle between each stripe of the reference pattern Pr and the first side 28 / second side 30 is defined as the first angle. When the detection pattern Pd is positioned near the second aperture 22 along the imaging path (i.e., the right dashed line in FIG. 8 ), the angle between the extension direction Ds' of the detection pattern Pd and the third side 32 / fourth side 34 is defined as the second angle. Alternatively, the angle between the arrangement direction Da of the reference pattern Pr and the first side 28 / second side 30 can be defined as the first angle, and the angle between the arrangement direction Da' of the detection pattern Pd and the third side 32 / fourth side 34 can be defined as the second angle.

[0048] As previously described, the extension direction Ds of the first side 28 of the first aperture 20 may intersect with the arrangement direction Da of the reference patterns Pr. The extension direction Ds of the third side 32 of the second aperture 22 also intersects with the arrangement direction Da of the reference patterns Pr. The intersection angle of the first side 28 and / or the third side 32 with respect to the arrangement direction Da is preferably 90 degrees. In other words, the first side 28 and / or the third side 32 are substantially perpendicular to the arrangement direction Da, but with an allowable angular error. The percentage of the allowable angular error depends on the overall optical and mechanical design of the 3D scanning device 10, for example, 5%, but actual applications are not limited to this.

[0049] Therefore, it can be seen that the first side 28 of the first aperture 20 and the third side 32 of the second aperture 22 are extended along the extension direction Ds of the multiple stripes, which can maintain the scanning depth of field of the 3D scanning device 10 and increase the brightness of the detection pattern Pd; the second side 30 of the first aperture 20 and the fourth side 34 of the second aperture 22 are shortened along the arrangement direction Da of the multiple stripes, thereby maintaining the brightness of the detection pattern Pd and increasing the scanning depth of field of the 3D scanning device 10.

[0050] See also Figure 8 and Figure 9 , Figure 9 This is a front view of a first polygonal aperture 20E according to a fifth embodiment of the present invention. The first aperture 20 can also be designed in the same manner as the first polygonal aperture 20E, and the second aperture 22 can also be designed in the same manner as the second polygonal aperture (not shown). Taking the first polygonal aperture 20E as an example, the first polygonal aperture 20E can include a first segment 36, a second segment 38, and a third segment 40. The first segment 36 and the third segment 40 are disposed on opposite sides of the second segment 38, and the area of ​​the second segment 38 is smaller than that of the first segment 36 and / or the third segment 40. Therefore, the small area of ​​the second segment 38 is designed to maintain or increase the scanning depth of field of the 3D scanning device 10, while the large area of ​​the first segment 36 and the third segment 40 is designed to maintain or increase the brightness of the detection pattern Pd.

[0051] From another perspective, the first segment 36, the second segment 38, and the third segment 40 are adjacent along the transverse direction Dh. The structural longitudinal dimension LL1 of the first segment 36 can be the same as or different from the structural longitudinal dimension LL3 of the third segment 40. The structural longitudinal dimensions LL1 of the first segment 36 and LL3 of the third segment 40 (defined as the largest structural longitudinal dimensions of the two segments) are both greater than the structural longitudinal dimension LL2 of the second segment 38 (defined as the smallest structural longitudinal dimension of the second segment 38). The structural longitudinal dimension LL1 refers to the length along the vertical direction of the first segment 36. Therefore, the structural longitudinal dimensions LL1, LL2, and LL3 can be orthogonal to the transverse direction Dh. This design objective is to ensure that the area of ​​the first segment 36 and / or the third segment 40 is greater than the area of ​​the second segment 38.

[0052] The dotted rectangular frame within the first polygonal aperture 20E corresponds to Figure 2The first aperture 20A shown is used to indicate that the area ratio of the first segment 36, the second segment 38, and the third segment 40 of the first polygonal aperture 20E can be approximately the ratio of the long side to the short side of the first aperture 20A. In addition, the first polygonal aperture 20E is preferably designed as a bilaterally symmetrical polygon; for example, the first polygonal aperture 20E can have at least two intersecting diagonals A1 and A2, and the length difference between the two diagonals A1 and A2 is less than a predetermined threshold, that is, the two diagonals A1 and A2 have the same or similar lengths. The actual value of the predetermined threshold depends on the structural design of the first polygonal aperture 20E and is not further explained here. The method of demarcating the two diagonals A1 and A2 is not limited to Figure 9 The embodiment shown can be changed accordingly depending on the number of sides and corners of the first polygonal aperture 20E.

[0053] Furthermore, the sides of the first polygonal aperture 20E can be straight or curved. As long as the area (or longitudinal dimension) of the first segment 36 and / or the third segment 40 is greater than the area (or longitudinal dimension) of the second segment 38, the design objectives of the present invention are met. The profile of the first polygonal aperture 20E can be identical, similar, or different from that of the second polygonal aperture, or the difference in profile can be less than a predetermined threshold. The ratio of the maximum transverse dimension to the minimum longitudinal dimension of the first polygonal aperture 20E located in the projection path can be between 1:1 and 1:5. The ratio of the maximum transverse dimension to the minimum longitudinal dimension of the second polygonal aperture located in the imaging path is preferably between 1:1 and 1:1.15.

[0054] In summary, the 3D scanning device of the present invention is primarily designed as an optical impression-taking device for dental use. A light source cannot be placed inside a patient's oral cavity, and the effectiveness of medical personnel illuminating the oral cavity with an external light source is also limited. Therefore, the optical system of the optical impression-taking device needs to be improved to enhance detection accuracy. Therefore, the 3D scanning device proposed in the present invention is used to detect the surface contour of an object. The 3D scanning device includes an illumination light source, a first aperture, a reference pattern generator, and a light receiver. The illumination light source is configured to output illumination light; the reference pattern generator utilizes the illumination light to generate a reference pattern and projects the reference pattern onto the object through the first aperture; the light receiver receives the detection pattern from the object and utilizes the difference between the reference pattern and the detection pattern to obtain the surface contour. The first aperture has two opposing first sides and two opposing second sides, and the first length of one of the two first sides is greater than the second length of one of the two second sides. By adjusting the shape, proportions, and / or size of the aperture, specially shaped apertures can significantly increase the amount of illumination light penetrating compared to elliptical apertures. This maintains the required depth of field for scanning applications while also maintaining the required brightness of the modeled image, ensuring that the object's surface contours are accurately and clearly captured.

[0055] Although the present invention is described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of the present invention and should not be construed as limiting the present invention. For the purpose of clearly describing the required components, the proportions in the schematic drawings do not represent the proportional relationships of the actual components.

[0056] The present invention has been described with reference to the above embodiments. However, the above embodiments are merely exemplary embodiments of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and improvements that do not depart from the spirit and scope of the present invention are intended to be protected by the present invention.

Claims

1. A 3D scanning device for detecting the surface contour of an object, characterized in that: The 3D scanning device includes: An illumination light source, used to output illumination light; First aperture; a reference pattern generator, which generates a reference pattern using the illumination light and projects the reference pattern onto the object through the first aperture; and a light receiver for receiving a detection pattern from the object to obtain the surface profile by utilizing a difference between the reference pattern and the detection pattern; The first aperture has two opposite first sides and two opposite second sides, and a first length of one of the two first sides is greater than a second length of one of the two second sides.

2. The 3D scanning device according to claim 1, wherein: The ratio of the first length to the second length is between 1:1 and 1:5, the two first sides are of equal length or unequal length, and the two second sides are of equal length or unequal length.

3. The 3D scanning device according to claim 1, wherein: The first side and the second side are straight lines; Alternatively, the first side is an arc, and the sum of the interior angles of the first aperture is less than 360 degrees; Alternatively, the first side is a turning line, and the sum of the internal angles of the first aperture is less than 360 degrees.

4. The 3D scanning device according to claim 1, wherein: The reference pattern has a plurality of stripes arranged adjacent to each other, and an extending direction of the first side of the first aperture intersects with an arrangement direction of the plurality of stripes.

5. The 3D scanning device according to claim 4, wherein: The included angle between the extending direction of the first side and the arrangement direction is 90 degrees, or the extending direction is perpendicular to the arrangement direction and has an allowable angle error.

6. The 3D scanning device according to claim 1, wherein: The reference pattern has a plurality of adjacently arranged stripes, and the first side of the first aperture extends along an extension direction of the plurality of stripes to maintain a scanning depth of field of the 3D scanning device and increase brightness of the detection pattern.

7. The 3D scanning device according to claim 1, wherein: The reference pattern has a plurality of stripes arranged adjacent to each other, and the second side of the first aperture is shortened along the arrangement direction of the plurality of stripes, thereby maintaining the brightness of the detection pattern and increasing the scanning depth of field of the 3D scanning device.

8. The 3D scanning device according to claim 1, wherein: The stereoscopic scanning device also includes a second aperture, and the first aperture and the second aperture are respectively quadrilateral apertures; the second aperture has two opposite third sides and two opposite third sides, the third length of one of the two third sides is greater than the fourth length of one of the two fourth sides, and the ratio of the third length to the fourth length is between 1:1 and 1:1.

15.

9. The 3D scanning device according to claim 8, wherein: A difference between a first ratio formed by the first side and the second side of the first aperture and a second ratio formed by the third side and the fourth side of the second aperture is smaller than a predetermined threshold.

10. The 3D scanning device according to claim 8, wherein: A first angle between the first side and / or the second side of the first aperture and the reference pattern is the same as or similar to a second angle between the third side and / or the fourth side of the second aperture and the reference pattern.

11. A 3D scanning device for detecting the surface contour of an object, characterized in that: The 3D scanning device includes: An illumination light source, used to output illumination light; a reference pattern generator, which generates a reference pattern using the illumination light and projects the reference pattern onto the object; Second aperture; and a light receiver receiving a detection pattern from the object through the second aperture to obtain the surface profile by utilizing a difference between the reference pattern and the detection pattern; The second aperture has two opposite third sides and two opposite fourth sides, and a first length of one of the two third sides is greater than a second length of one of the two fourth sides.

12. The 3D scanning device according to claim 11, wherein: The second aperture is a quadrilateral aperture, the ratio of the first length to the second length is between 1:1 and 1:1.15, the two third sides are equal or unequal in length and the two fourth sides are equal or unequal in length, the third side is a straight line, an arc or a turning line, and the sum of the internal angles of the fourth aperture is less than 360 degrees.

13. A 3D scanning device for detecting the surface contour of an object, characterized in that: The 3D scanning device includes: An illumination light source, used to output illumination light; First polygonal aperture; a reference pattern generator, which generates a reference pattern using the illumination light and projects the reference pattern onto the object through the first polygonal aperture; and a light receiver for receiving a detection pattern from the object to obtain the surface profile by utilizing a difference between the reference pattern and the detection pattern; The first polygonal aperture has a first segment, a second segment and a third segment adjacent to each other. The first segment and the third segment are respectively arranged on opposite sides of the second segment, and the area of ​​the second segment is smaller than that of the first segment and / or the third segment.

14. The 3D scanning device according to claim 13, wherein: The first polygonal aperture has two intersecting diagonal lines, and a length difference between the two diagonal lines is smaller than a predetermined threshold.

15. The 3D scanning device according to claim 13, wherein: The first section, the second section, and the third section are adjacent to each other along the transverse direction. A structural longitudinal dimension of the first section perpendicular to the transverse direction is greater than a structural longitudinal dimension of the second section perpendicular to the transverse direction.

16. The 3D scanning device according to claim 13, wherein: Each side of the first polygonal aperture is an arc or a straight line.

17. The 3D scanning device according to claim 13, wherein: The ratio of the maximum structural transverse dimension to the minimum structural longitudinal dimension of the first polygonal aperture is between 1:1 and 1:

5.

18. The 3D scanning device according to claim 13, wherein: The minimum structural longitudinal dimension of the second section is smaller than or equal to the minimum structural longitudinal dimension of the first section and / or the third section.

19. The 3D scanning device according to claim 13, wherein: The stereoscopic scanning device further includes a second polygonal aperture having a fourth segment, a fifth segment, and a sixth segment adjacent to each other, the fourth segment and the sixth segment being respectively arranged on opposite sides of the fifth segment, the area of ​​the fifth segment being smaller than the area of ​​the fourth segment and / or the sixth segment; and the ratio of the maximum structural lateral dimension to the minimum structural longitudinal dimension of the second polygonal aperture is between 1:1 and 1:1.15.

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