Illumination module and 3D scanner

Abstract

The utility model discloses an illumination module and a 3D scanner, and relates to the technical field of three-dimensional scanning. The lighting module comprises an annular mounting frame and a plurality of lighting modules arranged on the annular mounting frame, the middle of the annular mounting frame is used for placing a scanning module lens, and each lighting module comprises a first light source, a collimating lens and a shaping module which are sequentially arranged along a light path; light emitted by the first light source is sequentially collimated by the collimating lens and homogenized by the shaping module and then is emitted to form uniform light spots, and the illumination uniformity of the illumination module can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of three-dimensional scanning, in particular to a lighting module and a 3D scanner. BACKGROUND

[0002] In recent years, the rapid development of computer technology has promoted the gradual maturity of three-dimensional digital technology. Three-dimensional digital information acquisition and processing technology has a wide application prospect in the industries of mechanical processing, special effects production, virtual reality, cultural relic protection, costume design, three-dimensional communication, etc. A 3D scanner is a front-end device for computer input information developed for the development of three-dimensional information field. In the 3D scanner, the lighting effect of the lighting module will affect the extraction accuracy of the landmark points, and then affect the final scanning effect of the scanner and the measurement accuracy. Therefore, the design of the structure of the laser scanner with uniform illumination and high brightness is a key link in the whole scanner manufacturing process.

[0003] The lighting module equipped in the current 3D scanner has exposed a short board that seriously restricts the performance improvement, especially in the aspect of homogenizing the light spot of the lighting module. The light emitted by the lighting module widely used in the 3D scanner at the present stage presents an uneven state in spatial distribution. The brightness of the center region of the light spot is relatively high, while the brightness of the edge region suddenly drops, forming an obvious difference in light and dark gradient. When the uneven light spot is irradiated on the surface of the object to be scanned, the difference in reflected light intensity of different parts of the object is too large, so that the light signals obtained by the scanner are uneven. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide a lighting module and a 3D scanner which can improve the uniformity of the lighting module.

[0005] The embodiment of the present application is implemented as follows:

[0006] In one aspect of the embodiment of the present application, a lighting module is provided, which comprises a ring-shaped mounting frame and a plurality of lighting modules arranged on the ring-shaped mounting frame. The middle part of the ring-shaped mounting frame is used for placing a scanning module lens. The lighting module comprises a first light source, a collimating lens and a shaping module arranged in sequence along the light path. The light emitted by the first light source is collimated by the collimating lens and homogenized by the shaping module in sequence, and then exits to form a uniform light spot.

[0007] Optionally, as one implementable manner, the shaping module comprises a first shaping lens and a second shaping lens arranged in sequence in the exit direction of the first light source.

[0008] Optionally, as an implementable mode, the first shaping lens is a first cylindrical lens, and the second shaping lens is a second cylindrical lens, the cylindrical surfaces of the first cylindrical lens and the second cylindrical lens face the collimating lens, and the axes of the first cylindrical lens and the second cylindrical lens are perpendicular to each other.

[0009] Optionally, as an implementable mode, the first shaping lens is a first Powell prism, and the second shaping lens is a second Powell prism, the prism lines of the first Powell prism and the second Powell prism are perpendicular to each other.

[0010] Optionally, as an implementable mode, the ring-shaped mounting frame is provided with a plurality of mounting seats, the mounting seats are provided with a first clamping groove, a second clamping groove and a third clamping groove, the first light source is mounted through the first clamping groove, the collimating lens is mounted through the second clamping groove, and the shaping module is mounted through the third clamping groove.

[0011] Optionally, as an implementable mode, a plurality of mounting grooves are further arranged between two adjacent mounting seats, and the second light source is mounted through the mounting grooves.

[0012] Optionally, as an implementable mode, the ring-shaped mounting frame is provided with a circuit board and a control board, the circuit board is electrically connected with the first light source and the second light source, the control board is electrically connected with the circuit board, and the circuit board and the control board are arranged away from the light-emitting side.

[0013] Optionally, as an implementable mode, the ring-shaped mounting frame is provided with a connecting column, and the ring-shaped mounting frame and the circuit board are connected through the connecting column.

[0014] Optionally, as an implementable mode, the ring-shaped mounting frame is further provided with a heat-conducting block, and the heat-conducting block abuts against the circuit board.

[0015] Another aspect of the embodiment of the application provides a 3D scanner, which comprises a scanning module and the illumination module as any one of the above, and the lens of the scanning module is arranged in the middle of the ring-shaped mounting frame of the illumination module.

[0016] The beneficial effects of the embodiment of the application include:

[0017] The lighting module and the 3D scanner provided by the application comprise a ring-shaped mounting frame and a plurality of lighting modules arranged on the ring-shaped mounting frame, the middle part of the ring-shaped mounting frame is used for placing a scanning module lens, the design of the ring-shaped mounting frame fully considers the adaptation with the scanning module lens, which is convenient for installation and can ensure that the lighting module is closely matched with the scanning module, is suitable for various types of 3D scanners, and the lighting module comprises a first light source, a collimating lens and a shaping module arranged in sequence along a light path, and the light emitted by the first light source is emitted to form a uniform light spot after being collimated by the collimating lens and homogenized by the shaping module in sequence. Through the unique structure design of the lighting module, that is, the cooperation of the first light source, the collimating lens and the shaping module, the final emitted light spot is uniform. Compared with the traditional lighting module, the defects of bright center, dark edge and large light-dark gradient are overcome, the surface of the object to be scanned receives uniform illumination, the reflection intensity of each part of the object tends to be consistent, which lays a foundation for the scanner to obtain stable and reliable light signals. Due to the uniform light spot, the quality of the light signal obtained by the scanner is greatly improved, and then the landmark points can be extracted more accurately. In the 3D scanning process, accurate landmark point extraction is the key to realize high-precision scanning and accurate measurement, the lighting module provides a strong guarantee for the high-precision operation of the whole scanning process, and promotes the 3D scanner to play a more outstanding performance in various industry applications. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 One of the structure schematic diagrams of the lighting module provided by the embodiments of the application;

[0020] Figure 2 The second structure schematic diagram of the lighting module provided by the embodiments of the application;

[0021] Figure 3 One of the structure schematic diagrams of the lighting module provided by the embodiments of the application;

[0022] Figure 4 The second structure schematic diagram of the lighting module provided by the embodiments of the application.

[0023] Icon: 100 - lighting module; 110 - ring-shaped mounting frame; 111 - connecting column; 112 - heat-conducting block; 120 - lighting module; 121 - first light source; 122 - collimating lens; 123 - shaping module; 1231 - first shaping lens; 1232 - second shaping lens; 130 - mounting seat; 140 - second light source; 150 - circuit board; 160 - control board. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0026] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", "third" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "setting", "mounting", "connecting", "connecting" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0028] Please refer to Figure 1 , Figure 2 and Figure 3The embodiment provides a lighting module 100, which comprises a ring-shaped mounting rack 110 and a plurality of lighting modules 120 arranged on the ring-shaped mounting rack 110, the middle part of the ring-shaped mounting rack 110 is used for placing a scanning module lens, the lighting module 120 comprises a first light source 121, a collimating lens 122 and a shaping module 123 arranged in sequence along an optical path, and the light emitted by the first light source 121 is emitted to form a uniform light spot after being collimated by the collimating lens 122 and homogenized by the shaping module 123 in sequence.

[0029] The plurality of lighting modules 120 are distributed at equal intervals along the circumference of the ring-shaped mounting rack 110, and the middle part of the ring-shaped mounting rack 110 is specially reserved for placing the scanning module lens, so that the lighting module 100 can provide sufficient light for the scanning process and does not hinder the normal work of the scanning module. The lighting module 120 is composed of the first light source 121, the collimating lens 122 and the shaping module 123 arranged in sequence along the optical path. The first light source 121 serves as an initial light emitting component, and the light emitted by the first light source 121 has certain divergence characteristics; the collimating lens 122 then plays a role in collimating the divergent light into parallel light, preliminarily standardizing the light propagation direction; and the shaping module 123 is a core homogenization component, after which the light is emitted to form a uniform light spot, effectively solving the problem of non-uniform light spot of the traditional lighting module 100.

[0030] The lighting module 100 provided by the application comprises a ring-shaped mounting rack 110 and a plurality of lighting modules 120 arranged on the ring-shaped mounting rack 110, the middle part of the ring-shaped mounting rack 110 is used for placing a scanning module lens, the design of the ring-shaped mounting rack 110 fully considers the adaptation with the scanning module lens, which is convenient for installation and can ensure that the lighting module 100 closely cooperates with the scanning module, and is suitable for various types of 3D scanners. The lighting module 120 comprises a first light source 121, a collimating lens 122 and a shaping module 123 arranged in sequence along an optical path, and the light emitted by the first light source 121 is emitted to form a uniform light spot after being collimated by the collimating lens 122 and homogenized by the shaping module 123 in sequence. Through the unique structure design of the lighting module 120, that is, the cooperation of the first light source 121, the collimating lens 122 and the shaping module 123, the final emitted light spot is uniform. Compared with the traditional lighting module 100, the defects of light spot center bright, edge dark and large brightness gradient are overcome, the surface of the object to be scanned receives uniform illumination, the reflection light intensity of each part of the object tends to be consistent, and a foundation is laid for the scanner to obtain stable and reliable light signals. Due to the uniform light spot, the quality of the light signal obtained by the scanner is greatly improved, and then the landmark points can be more accurately extracted. In the 3D scanning process, accurate landmark point extraction is the key to realizing high-precision scanning and accurate measurement, the lighting module 100 provides a strong guarantee for the high-precision operation of the whole scanning process, and promotes the 3D scanner to play a more outstanding performance in various industry applications.

[0031] In an embodiment of the present application, as shown in Figure 1 、 Figure 2 and Figure 3 , the shaping module 123 includes a first shaping lens 1231 and a second shaping lens 1232 arranged in sequence in the direction of the first light source 121. The two-stage shaping lens structure increases can optimize the collimated light twice.

[0032] In an embodiment of the present application, as shown in Figure 1 , the first shaping lens 1231 is a first cylindrical lens, and the second shaping lens 1232 is a second cylindrical lens. The cylindrical surfaces of the first cylindrical lens and the second cylindrical lens face the collimating lens 122, and the axes of the first cylindrical lens and the second cylindrical lens are perpendicular to each other. By using the special optical properties of the cylindrical lens and arranging them perpendicular to each other, the light spot can be finely controlled in both horizontal and vertical dimensions, greatly improving the uniformity of the light spot. This allows the scanned object to receive nearly uniform illumination intensity regardless of its complex shape, significantly improving scanning accuracy.

[0033] Further, the first shaping lens 1231 includes a plurality of first cylindrical lenses arranged to form a first array of cylindrical lenses, and the second shaping lens 1232 includes a plurality of second cylindrical lenses arranged to form a second array of cylindrical lenses. This allows the light spot to be finely controlled in both horizontal and vertical dimensions, greatly improving the uniformity of the light spot. This allows the scanned object to receive nearly uniform illumination intensity regardless of its complex shape, significantly improving scanning accuracy.

[0034] Further, a DOE lens is arranged on the side of the second array of cylindrical lenses away from the first array of cylindrical lenses. The DOE lens, i.e. the diffractive optical element (DOE), is an optical element that uses the principles of diffraction and interference of light to control light. The DOE usually uses micro-nano etching process to form two-dimensional distribution of diffraction units on the surface of optical material. Each diffraction unit has specific topography, refractive index, etc., which can finely control the wavefront phase distribution of incident laser, thereby improving the uniformity of the illumination spot.

[0035] In an embodiment of the present application, as shown in Figure 1 、 Figure 2 and Figure 4As shown, the first shaping lens 1231 is a first Powell prism, and the second shaping lens 1232 is a second Powell prism, and the prism lines of the first Powell prism and the second Powell prism are perpendicular to each other. The unique refraction principle of the Powell prism, combined with the perpendicular arrangement mode, can efficiently disperse the light energy of the center of the light spot to the edge area, effectively balance the brightness distribution of the light spot, compared with the traditional uniform light method, while improving the uniformity of the light spot, it can also reduce the loss of light energy and improve the illumination efficiency, and provide better illumination conditions for 3D scanning.

[0036] Further, a DOE lens is arranged on the side of the second Powell prism away from the first Powell prism, thereby improving the uniformity of the illumination light spot.

[0037] In an embodiment of the present application, as shown in Figure 1 , Figure 2 and Figure 3 , a plurality of mounting seats 130 are arranged on the annular mounting frame 110, and a first clamping groove, a second clamping groove and a third clamping groove are arranged on the mounting seat 130, the first light source 121 is installed through the first clamping groove, the collimating lens 122 is installed through the second clamping groove, and the shaping module 123 is installed through the third clamping groove.

[0038] The plurality of mounting seats 130 on the annular mounting frame 110 are connected with the annular mounting frame 110 by an integrated injection molding process, ensuring the stability of the connection. The first clamping groove, the second clamping groove and the third clamping groove designed on each mounting seat 130 are precisely manufactured according to the outer dimensions of the corresponding first light source 121, collimating lens 122 and shaping module 123 in size and shape, and the inside of the clamping groove is provided with a flexible buffer material such as a rubber pad, which can not only realize tight fixing, but also prevent the elements from being damaged due to collision during installation. When installing, each element is gently clamped into the corresponding clamping groove in sequence, and the relative position of the element is accurately ensured by the limiting action of the clamping groove. This assembly method simplifies the assembly process of the illumination module 100, improves the production efficiency, at the same time ensures the installation accuracy of each key optical element, reduces the light transmission deviation caused by installation error, ensures the performance stability of the illumination module 100, reduces the production cost and the difficulty of later maintenance.

[0039] In an embodiment of the present application, as shown in Figure 1 , Figure 2 and Figure 3 , a plurality of mounting grooves are further arranged between the two adjacent mounting seats 130, and the second light source 140 is installed through the mounting groove.

[0040] By increasing the second light source 140 and the matching installation groove design, the brightness of the lighting module 100 can be flexibly improved without changing the main body lighting structure, meeting the diversified needs of different scanning scenes for light intensity, especially for some scanning objects with low surface reflectivity or rich details, providing more sufficient light to ensure the integrity and accuracy of scanning.

[0041] Wherein the first light source 121 is an LD light source, and the second light source 140 is an LED light source. The first light source 121 uses a semiconductor diode (abbreviated as LD) as a light source, which has the characteristics of large output range, high brightness, and uniform illumination.

[0042] In one feasible embodiment of the present application, as shown in Figure 1 、 Figure 2 and Figure 3 , it further includes a circuit board 150 and a control board 160 arranged on the annular mounting frame 110, the circuit board 150 is electrically connected with the first light source 121 and the second light source 140, the control board 160 is electrically connected with the circuit board 150, and the circuit board 150 and the control board 160 are arranged away from the light emitting side.

[0043] Further, the annular mounting frame 110 is provided with a connecting column 111 for connecting the annular mounting frame 110 and the circuit board 150.

[0044] Further, the annular mounting frame 110 is further provided with a heat conduction block 112, and the heat conduction block 112 abuts against the circuit board 150.

[0045] Specifically, on the circuit board 150, the driving circuit, light adjusting circuit, etc. of each light source are integrated together through precise wiring to ensure stable power supply and accurate light adjustment. The control board 160 selects a high-performance microcontroller chip, which is connected with the circuit board 150 through a wire or a socket to realize the reception and processing of remote control instructions. During installation, the circuit board 150 and the control board 160 are fixed on the back of the annular mounting frame 110 away from the light emitting side, and the bracket and screws are used to ensure firm installation. The addition of the heat conduction block 112 effectively solves the performance degradation problem caused by the heating of the circuit board 150. Through rapid heat dissipation, the working temperature of the electronic components on the circuit board 150 is ensured to be within the normal range, improving the reliability and service life of the lighting module 100, reducing the downtime caused by overheating, and improving the overall working efficiency of the 3D scanner.

[0046] The embodiment of the present application further discloses a 3D scanner comprising the scanning module and the illumination module 100 in the foregoing embodiment, and a lens of the scanning module is arranged in the middle of the annular mounting frame 110 of the illumination module 100. The 3D scanner comprises the same structure and beneficial effects as the illumination module 100 in the foregoing embodiment. The structure and beneficial effects of the illumination module 100 have been described in detail in the foregoing embodiment, and will not be described here again.

[0047] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lighting module, characterized by The illumination module comprises a ring-shaped mounting frame, a plurality of illumination modules arranged on the ring-shaped mounting frame, and a scanning module lens arranged in the middle of the ring-shaped mounting frame.

2. The lighting module of claim 1, wherein, The shaping module comprises a first shaping lens and a second shaping lens arranged in sequence in the direction of light emission of the first light source.

3. The lighting module of claim 2, wherein, The first shaping lens is a first cylindrical lens, and the second shaping lens is a second cylindrical lens.

4. The lighting module of claim 2, wherein, The first cylindrical lens and the second cylindrical lens are arranged in sequence in the direction of light emission of the first light source.

5. The lighting module of claim 1, wherein, The first shaping lens is a first cylindrical lens, and the second shaping lens is a second cylindrical lens.

6. The lighting module of claim 5, wherein, The first cylindrical lens and the second cylindrical lens are arranged in sequence in the direction of light emission of the first light source.

7. The lighting module of claim 6, wherein, The ring-shaped mounting frame is provided with a plurality of mounting seats, and the mounting seat is provided with a first clamping groove, a second clamping groove and a third clamping groove.

8. The lighting module of claim 7, wherein, The first light source is installed through the first clamping groove, the collimating lens is installed through the second clamping groove, and the shaping module is installed through the third clamping groove.

9. The lighting module of claim 7, wherein, A plurality of installation grooves are arranged between adjacent two mounting seats, and the second light source is installed through the installation grooves.

10. A 3D scanner characterized in that, The ring-shaped mounting frame is provided with a connecting column, and the ring-shaped mounting frame and the circuit board are connected through the connecting column. The ring-shaped mounting frame is further provided with a heat-conducting block, and the heat-conducting block is in abutment with the circuit board. The illumination module comprises a ring-shaped mounting frame, a plurality of illumination modules arranged on the ring-shaped mounting frame, and a scanning module lens arranged in the middle of the ring-shaped mounting frame.

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