Detection light source and defect detection device

Abstract

The utility model discloses a detection light source and a defect detection device, and belongs to the technical field of defect detection. The detection light source comprises a light-emitting module, a light filtering module and a light equalizing module, the light-emitting module comprises a plurality of light-emitting light sources, the light filtering module comprises a plurality of light filters, each light filter corresponds to one light-emitting light source, and each light filter reflects light of different wave bands; the light uniformizing module is used for uniformizing light and arranged at the light outlet end of the detection light source, and the light-emitting light source is reflected by the corresponding light filter and then emitted to the light uniformizing module. The detection light emitted by the detection light source can be compatible with different types of light through the multiple light-emitting light sources, the light-emitting light sources are arranged to be reflected to the light uniformizing module through the corresponding light filters, so that the lighting angles of various types of light are consistent, and the light of the detection light source passes through the light uniformizing module before being emitted, so that the lighting uniformity is high.

Description

Technical Field

[0001] The present application relates to the technical field of defect detection, and in particular to a detection light source and a defect detection device. Background Art

[0002] In the field of automated optical inspection (AOI) of customized mobile phone parts, the common detection light sources in the industry currently use multi-color dome light, multi-color ring light or time-sharing strobe. Among them, multi-color dome light has high uniformity, but its size is huge; multi-color ring light is compatible with multi-color lighting, but the lighting angles of each color light source are inconsistent, and the uniformity of the light source lighting area is insufficient; time-sharing strobe lighting has better uniformity, but the disadvantage is that the lighting angles of different light sources are inconsistent. Therefore, in the scene of heterochromatic detection of customized mobile phone parts, a detection light source with high lighting uniformity, strong color compatibility and consistent lighting angle is required. Utility Model Content

[0003] The present application provides a detection light source and a defect detection device, providing a detection light source with high lighting uniformity, strong color compatibility and consistent lighting angle.

[0004] The technical solution is as follows:

[0005] The first aspect of the present application provides a detection light source, comprising:

[0006] A light-emitting module, comprising a plurality of light sources;

[0007] The filter module includes a plurality of filters, each filter corresponds to a light source, and each filter is used to reflect light of different wavelength bands;

[0008] The light-evening module is used for light evenness and is arranged at the light-emitting end of the detection light source. The light emitted by the light-emitting light source can be directed to the light-evening module after being reflected by the corresponding filter.

[0009] By including multiple light sources, the detection light emitted by the detection light source can be compatible with different types of light. The light source is set to reflect to the light averaging module through the corresponding filter so that the lighting angles of various lights are consistent. The light of the detection light source passes through the light averaging module before emitting, so that the lighting uniformity is high.

[0010] In some implementations, the filters are distributed in sequence along the first direction, the filters are arranged in parallel and each filter has an angle with the first direction; the light emitted by each light source along the central axis toward the corresponding filter can converge at the same position after reflection.

[0011] The filters are arranged in parallel to reduce the volume of the detection light source. In addition, by setting the positions of the light source, the filter and the light averaging module, the light emitted by each light source along the central axis to the corresponding filter can be concentrated at the same position after reflection, so as to achieve the concentration of the intensity of light sources with different wavelengths.

[0012] In some implementations, the angle between the filter and the first direction is 45°.

[0013] The angle between the filter and the first direction is 45°, which facilitates setting the position of the light-homogenizing module inside the detection light source, that is, the central axis of the light-homogenizing module is set parallel to the first direction.

[0014] In some implementations, the direction from the filter module to the light-averaging module is the first direction, each filter has an angle with the first direction, and the angles between each filter and the first direction are different; the light from each light source emitted along the central axis to the corresponding filter can converge at the same position after reflection.

[0015] By setting the angles between each filter and the first direction to be different, the installation method of the filter can be expanded, not limited to the installation method where each filter is only parallel. The angles between each filter and the first direction are different, and the angles of each filter are reasonably set to further reduce the volume of the detection light source. In addition, by setting the positions of the light source, the filter, and the light averaging module, the light emitted by each light source along the central axis to the corresponding filter can be reflected and converged at the same position, which is convenient for achieving the concentration of the intensity of light sources with different wavelengths.

[0016] In some implementations, the angle between each filter and the first direction gradually increases along the direction from the light averaging module to the light filtering module. The filter with the largest angle with the first direction is called a distal filter. Each filter along the direction from the light averaging module to the light filtering module corresponds to each light source one by one. The light source farthest from the light averaging module is the distal light source. The light emitted by the distal light source is transmitted through other filters except the distal filter in sequence and then emitted to the distal filter.

[0017] By designing the positions of the above filters, the volume of the detection light source can be further reduced.

[0018] In some implementations, the angle of the filter is adjustable.

[0019] The angle of the filter can be adjusted according to actual needs, so that the light emitted by each light source along the central axis toward the corresponding filter can be concentrated at the same position after reflection.

[0020] In some implementations, the detection light source further includes a collimating module for focusing light, the collimating module is disposed between the light emitting module and the filter module, and the light emitted by the light emitting light source passes through the collimating module and is emitted toward the corresponding filter.

[0021] The light emitted by the light emitting module is directed toward the collimating module, and the collimating module shapes the light with a large divergence angle into a state close to parallel light, so as to increase the output light power of the light emitting module and improve the utilization rate of the light source.

[0022] In some implementations, the detection light source includes a housing, and the light emitting light source is detachably connected to the housing.

[0023] The light source is detachably connected to the shell to facilitate replacement of different light sources. The light source is detachably connected to the shell of the detection light source. When a light source fails, the failed light source can be removed and replaced with a light source that can emit light normally.

[0024] In some implementations, at least one luminescent light source emits a wavelength band between 420 and 520 nm, at least one luminescent light source emits a wavelength band between 520 and 620 nm, and at least one luminescent light source emits a wavelength band between 620 and 720 nm.

[0025] By including at least one luminous light source in three wavelength intervals of 420-520nm, 520-620nm and 620-720nm, it is convenient to detect different customized parts of the mobile phone.

[0026] A second aspect of the present application provides a defect detection device, comprising a detection light source as provided by any of the above technical solutions.

[0027] Through the above technical solution, since the defect detection device includes the above detection light source, it at least has all the beneficial effects of the detection light source, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a cross-sectional schematic diagram of a multi-color dome light source in the prior art;

[0029] Figure 2 It is a cross-sectional schematic diagram of a multi-color ring light source in the prior art;

[0030] Figure 3 It is a schematic diagram of a time-division frequency flash light source in the prior art;

[0031] Figure 4 It is a comparison diagram of different shadow areas produced when incident light at different angles illuminates the protruding structure of the inspected part;

[0032] Figure 5 is a block diagram of a detection light source provided in an embodiment of the present application;

[0033] Figure 6 It is a schematic diagram of the structure of the detection light source provided in the embodiment of the present application;

[0034] Figure 7 is another block diagram of a detection light source provided in an embodiment of the present application;

[0035] Figure 8 is another structural schematic diagram of the detection light source provided in an embodiment of the present application;

[0036] Fig. 9 is a schematic diagram of a light-averaging module provided in an embodiment of the present application;

[0037] Fig.10 It is a schematic diagram of the case where the filters in the detection light source provided in the embodiment of the present application are arranged in parallel;

[0038] Fig.11 It is a schematic diagram of the light path when the filters in the detection light source provided in the embodiment of the present application are arranged in parallel;

[0039] Fig.12 This is a usage scenario of the detection light source provided by the embodiment of the present application in which the filters are arranged in parallel;

[0040] Fig.13 It is a schematic diagram of a case where the filters in the detection light source provided in an embodiment of the present application are not arranged in parallel;

[0041] Fig.14 It is a schematic diagram of the light path when the filters in the detection light source provided in the embodiment of the present application are not arranged in parallel;

[0042] Fig.15 is a diagram of the angle relationship between the arrangement spacing of the light sources and the filter provided in the embodiment of the present application;

[0043] Fig.16 This is a usage scenario of the detection light source provided by the embodiment of the present application in which the filters are not arranged in parallel;

[0044] Fig.17 It is a comparison diagram of the shadow area generated when the detection light source provided in the embodiment of the present application illuminates the protruding structure of the detected part.

[0045] The meanings of the figures are as follows:

[0046] 100, test light source; 200, multi-color dome light source; 300, multi-color ring light source; 400, time-sharing flash light source; 500-lens; 600-camera; 700-tested part;

[0047] 11. Light emitting module; 12. Light filtering module; 13. Light averaging module; 14. Collimation module;

[0048] 111. Luminous light source;

[0049] 1111, a first light source; 1112, a second light source; 1113, a third light source;

[0050] 121. Filter;

[0051] 1211, a first filter; 1212, a second filter; 1213, a third filter;

[0052] 131. convex lens; 132. concave lens; 133. micro lens array;

[0053] 141. Lens;

[0054] I-beam one; II-beam two. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings. The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, but cannot be understood as limiting the present application.

[0056] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "top", "bottom", "inside", "outside", "up", "down", "left", "right", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0057] In order to clearly describe the technical solution of the present application, the words "first", "second" and the like are used to distinguish the same or similar items with substantially the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit the difference.

[0058] In this application, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0060] It should be noted that, in this application, words such as "in one embodiment", "exemplarily", "for example", etc. are used to indicate examples, illustrations or descriptions. Any embodiment or design described in this application as "in one embodiment", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in one embodiment", "exemplarily", "for example", etc. is intended to present related concepts in a specific way.

[0061] Before explaining the detection light source provided in the embodiment of the present application in detail, the existing related detection light sources are first explained.

[0062] Automated Optical Inspection (AOI) is a visual inspection technology widely used in the electronics manufacturing industry to improve product quality by effectively identifying defects during the manufacturing process. The technology combines advanced optics, cameras, and image processing capabilities to perform inspections. AOI systems inspect a variety of surface features, including the presence or absence of components, size, color, shape, alignment, and pattern.

[0063] In an AOI system, the optical system plays a key role as it is responsible for acquiring images of the items to be inspected. The quality of these images directly affects the overall performance of the system. A typical optical system in an AOI consists of a light source, a set of lenses, and a digital camera.

[0064] Light source: The light source illuminates the product being inspected. The type, color, and lighting angle of the light source can greatly affect the effectiveness of defect detection. Different AOI systems use different types of light sources depending on the application.

[0065] Lens: This component of the system directs light reflected from the product into the camera sensor. A high-quality lens is essential to capturing a clear image. The lens system can be adjusted to change the field of view and depth of field, enabling the inspection of different sizes and types of products.

[0066] Camera: Takes an image of the product. Cameras in AOI systems range from standard 2D cameras to sophisticated 3D sensors that capture depth information. They contain millions of tiny light-sensitive cells called pixels that convert the light they receive into digital data. The AOI’s software algorithms then process that data to perform inspections.

[0067] In the field of AOI defect detection for customized mobile phone parts, customized parts (such as battery back covers, folding screen mobile phone shaft covers, etc.) have various colors. For the detection of heterochromatic defects (different color categories), a multi-color uniform light source is generally required. Currently, the common detection light sources in the industry mostly use multi-color dome light sources, multi-color ring light sources, or time-sharing frequency flash light sources.

[0068] See also Figure 1 , schematically shows a multi-color dome light source 200. The light source in the multi-color dome light source 200 is a light emitting diode (LED for short), and the light emitted by the LED is reflected by the arched bowl-shaped shell to form illumination light, which can achieve uniform illumination of the curved metal surface. Figure 1 , which illustrates that the light emitted by the light emitting diode is reflected by the bowl-shaped housing and then emitted to illuminate the detected object 700 , and the detected object 700 reflects the light to the lens 500 and the camera 600 .

[0069] The multi-color dome light source 200 has high light uniformity, but is relatively large in size. When multiple colors of light are added to the light source space, the volume will be even larger. The increased volume will increase the working distance. Limited by the working distance and field of view, the lenses 500 that can be used with it are often limited, and the detection accuracy cannot be improved.

[0070] See also Figure 2 , schematically shows a multi-color ring light source 300. With respect to the multi-color ring light source 300, the LED array is in a cone shape and illuminates the surface of the object to be measured at an oblique angle. Figure 2 , indicating the direction of light exposure.

[0071] The multi-color ring light source 300 can output multi-color ring light and is compatible with multi-color lighting, but the lighting angles of the light sources of different colors are inconsistent, and the uniformity of the lighting area of ​​the light source is insufficient.

[0072] See also Figure 3 , illustrating a time-sharing stroboscopic light source 400. The time-sharing stroboscopic light source 400 is different from the constant illumination mode of the traditional linear array scanning. The time-sharing stroboscopic controller switches the type or brightness of the light source when the linear array camera captures each line of image, so that multiple light sources are orderly spaced and arranged in the image.

[0073] The time-division stroboscopic light source 400 has good lighting uniformity, but has the disadvantage that the lighting angles of different types of light are inconsistent.

[0074] For the above-mentioned multi-color ring light source 300 and time-division stroboscopic light source 400, the lighting angles of different types (colors) of light are inconsistent. Different colors of customized parts use different colors of illumination light. If the defect area of ​​the heterogeneous customized parts has concave-convex structural characteristics, the lighting angles of different colors of light are inconsistent, which will cause differences in the light and shadow effects of the heterogeneous customized parts, and then cause grayscale differences in the collected images, affecting the detection accuracy. For details, please refer to Figure 4Different types of light have different lighting angles, and the light and shadow effects of defects are different. The light source can emit beam I and beam II. Beam I and beam II are two lights of different colors. The position of the light source is fixed. When beam I is used to illuminate a test piece of one color, Figure 4 In (a), the irradiation angle is small and the shadow area of ​​the protruding structure is large. When the light beam II is used to illuminate the detection piece of another color, Figure 4 In (b), the illumination angle is large and the shadow area of ​​the protruding structure is small.

[0075] Therefore, in the scenario of detecting different colors of customized mobile phone parts, a detection light source with high lighting uniformity, strong color compatibility and consistent lighting angle is required.

[0076] The detection light source 100 provided in the embodiment of the present application is explained in detail below.

[0077] This embodiment provides a detection light source 100 , including a light emitting module 11 , a light filtering module 12 and a light averaging module 13 .

[0078] See also Figure 5 , illustrates a block diagram of a detection light source 100 , where a light emitting module 11 emits light, which is emitted toward a light-evening module 13 through a light-filtering module 12 , and then emitted to form detection light after passing through the light-evening module 13 .

[0079] The light emitting module 11 includes a plurality of light sources 111. By providing a plurality of light sources 111, the detection light emitted by the detection light source 100 can be compatible with different types of light.

[0080] It should be noted that for different types of light, that is, light of different wavelengths or different colors, the detection light source 100 can be switched to emit different types of light for detection according to actual application scenarios, such as when detecting customized mobile phone parts of different colors.

[0081] The light source 111 may be, for example, a light emitting diode (LED), a laser diode (LD), a super luminescent diode (SLD), or the like.

[0082] Light emitting diodes (LEDs) usually emit monochromatic light of a specific wavelength, but there are also multi-color LEDs. Multi-color LEDs are usually composed of phosphors of different colors, and can emit light of different colors by controlling different currents. The light source 111 provided in this embodiment is preferably a monochromatic light emitting diode (LED).

[0083] A laser diode (LD) is a semiconductor device that can generate monochromatic, high-brightness laser light.

[0084] Superluminescent diode (SLD) is a semiconductor optoelectronic device between laser (LD) and light-emitting diode (LED). Its optical properties are between LD and LED, with a wider emission spectrum and shorter coherence length than LD, and higher output power and higher modulation bandwidth than LED.

[0085] In this embodiment, regarding the number of light sources 111 in the light module 11, a reasonable number of light sources 111 can be set according to actual conditions. For example, the number of light sources 111 can be three, four, or five, etc. When the number of light sources 111 is large, more light of different wavelengths or colors can be provided, but the volume of the detection light source 100 will also be increased. Therefore, a reasonable number of light sources 111 is set according to the specific actual detection scene.

[0086] The filter module 12 includes a plurality of filters 121 , each filter 121 corresponds to a light source 111 , and each filter 121 is used to reflect light of different wavelength bands.

[0087] In this embodiment, by providing a filter 121, the light emitted by the light source 111 is reflected to the light-homogenizing module 13 through the corresponding filter 121, so as to achieve the function of focusing light and facilitate the realization of consistent lighting angles of various lights.

[0088] See also Figure 6 , which shows that each filter 121 corresponds to a light source 111, that is, Figure 6 In the embodiment, a filter 121 is disposed directly above each luminescent light source 111 , and the luminescent light source 111 and the filter 121 directly above it are in a one-to-one correspondence. Figure 6 It is only for illustration that each filter 121 corresponds to a light source 111 , and the positions of the light source 111 and the filter 121 are not limited.

[0089] The filter 121 can reflect light of a specific wavelength, and can absorb or transmit light of other wavelengths than the specific wavelength. Different filters can reflect light of different specific wavelengths.

[0090] When each luminescent light source 111 is a single-wavelength light source, the luminescent light source 111 emits a single-wavelength light, which is reflected to the light-evening module 13 after being irradiated by the corresponding filter 121. If the luminescent light source 111 irradiates a non-corresponding filter 121, the filter 121 can transmit the light of the luminescent light source 111, that is, if the luminescent light source 111 irradiates a non-corresponding filter 121, the filter 121 will not reflect the light emitted by the luminescent light source 111 to the light-evening module 13, thereby achieving the goal that the single-wavelength lights emitted by different luminescent light sources 111 are respectively reflected to the light-evening module 13 through the corresponding filters 121.

[0091] For example, when each luminescent light source 111 is a non-single wavelength light source, the luminescent light source 111 emits light containing multiple wavelengths. After irradiating the corresponding filter 121, the filter 121 reflects light of a specific wavelength and transmits light of other wavelengths. That is, each filter 121 reflects light of a specific wavelength of the luminescent light source 111 to the light-evening module 13, and transmits light of a non-specific wavelength. The light directed to the light-evening module 13 includes light of different wavelengths. At this time, each luminescent light source 111 can be selected to be the same luminescent light source 111.

[0092] The light-evening module 13 is used for evenly even light and is disposed at the light-emitting end of the detection light source 100 .

[0093] Light uniformity refers to the degree of difference in light intensity received at different locations, and is generally expressed as the ratio of minimum light intensity to maximum light intensity. The higher the light uniformity, the smaller the difference in light intensity received at various locations within the lighting venue.

[0094] The light-homogenizing module 13 provided in this embodiment is used to evenly reflect the light from the filter 121 to the light-homogenizing module 13 , thereby improving the light uniformity, so as to facilitate the detection of product surface features.

[0095] The detection light source 100 provided in this embodiment includes a plurality of light sources 111 so that the detection light emitted by the detection light source 100 can be compatible with different types of light. The light source 111 is arranged to be reflected to the light averaging module 13 through the corresponding filter 121 so that the lighting angles of various lights are consistent. The light of the detection light source 100 passes through the light averaging module 13 before emitting, so that the lighting uniformity is high.

[0096] In summary, the detection light source 100 provided in this embodiment has high lighting uniformity, strong color compatibility and consistent lighting angle, which avoids the problem in the prior art that different types of light from the detection light source 100 have inconsistent light emission angles, which is not conducive to the detection of the surfaces of heterochromatic products.

[0097] The detection light source 100 provided in this embodiment can be applied to the optical detection of customized mobile phone parts (such as battery back covers, folding screen mobile phone shaft covers, etc.). Of course, the detection light source 100 provided in this embodiment is not limited to being applied to customized mobile phone parts, but can also be applied to the optical detection of other products besides mobile phones.

[0098] See also Figure 7 and Figure 8 , Figure 7 A block diagram of another embodiment of the detection light source 100 is shown; Figure 8 A simplified structural diagram of another embodiment of the detection light source 100 is shown.

[0099] That is, in one embodiment, the detection light source 100 further includes a collimating module 14 for focusing light. The collimating module 14 is disposed between the light emitting module 11 and the filter module 12 . The light emitted by the light emitting light source 111 passes through the collimating module 14 and is emitted toward the corresponding filter 121 .

[0100] See also Figure 7 The light emitting module 11 emits light, the light passes through the collimating module 14 toward the filtering module 12, and is reflected by the filtering module 12 to the light averaging module 13, and then is emitted after passing through the light averaging module 13 to form the detection light.

[0101] The light emitted by the light emitting module 11 is directed toward the collimating module 14 , and the collimating module 14 shapes the light with a large divergence angle into a state close to parallel light, so as to increase the output light power of the light emitting module 11 and improve the utilization rate of the light source.

[0102] Exemplarily, the collimating module 14 includes a plurality of lenses 141, each light source 111 corresponds to a lens 141, and the light emitted by each light source 111 is emitted to the corresponding filter 121 through the corresponding lens 141. Figure 8 , schematically showing that each light source 111 corresponds to a lens 141.

[0103] Regarding the lens 141, a transparent material such as glass is ground into a circular thin sheet so that both surfaces are curved or one surface is flat, thus forming a lens. Its function is to converge or diverge light beams through refraction of its two surfaces and to form an image of an object at any desired position. In this embodiment, the focusing function of the lens is mainly utilized to improve the utilization rate of the light source.

[0104] See also Figure 8 When the lens 141 of the collimating module 14 is a lens 141 in which light enters from one side and exits from the opposite other side, the lens 141 can be respectively arranged on both sides of the corresponding light source 111 and the filter 121. Figure 8 A lens 141 is disposed directly above each light source 111 , and a filter 121 is disposed directly above each lens 141 .

[0105] Preferably, each lens 141 of the collimating module 14 has the same structure, so as to facilitate the manufacture of the detection light source 100. Of course, for each lens 141 of the collimating module 14, different types of lenses can also be selected.

[0106] Preferably, each lens 141 of the collimating module 14 is detachably mounted on the housing of the detection light source 100 .

[0107] Specifically, the lens 141 of the collimating module 14 may be a cylindrical lens, a doublet lens or a total reflection lens, which can achieve beam shaping and improve the utilization rate of the light source.

[0108] A cylindrical lens is a cylindrical lens with a cross section of two arcs or one arc and a straight line. Cylindrical lenses are often used in optical systems to focus or diverge light in a certain direction.

[0109] A doublet lens is a lens formed by gluing two lenses together. This combination lens formed by two lenses is an effective way to achieve short focal length, high magnification and good imaging quality.

[0110] The total reflection lens utilizes the special shape and material of the lens to make the light always reflect inside the lens and not transmit out, thereby realizing the focusing and imaging of the incident light. When the lens of the collimating module 14 is a total reflection lens, the lens is respectively arranged on the same side of the corresponding light source 111 and the filter 121.

[0111] It is listed above that the lens of the collimating module 14 can be a cylindrical lens, a doublet lens or a total reflection lens. The lens of the collimating module 14 includes but is not limited to a cylindrical lens, a doublet lens or a total reflection lens.

[0112] In one embodiment, the light homogenizing module 13 includes one of frosted glass, an engineering diffuser, a diffractive optical element (DOE), and a microlens array (MLA).

[0113] Frosted glass can make the light from the light source propagate through multiple angles through refraction and reflection, thereby avoiding the influence of the non-uniformity and intensity variation of the light source on the interference fringes. By using frosted glass, more stable and uniform lighting conditions can be obtained.

[0114] An engineered diffuser is also called an engineered scatterer, which achieves uniform distribution of light or controls the focusing effect of light by scattering light.

[0115] Diffractive optical elements can be used to generate uniform light fields. Through the diffraction effect, using diffractive optical elements in optical systems can achieve light wavefront leveling and the formation of a uniform light field, thereby improving the quality and uniformity of light.

[0116] Microlens Array (MLA) is an optical element composed of multiple microlenses with micron-level aperture and relief depth arranged in a specific way. The shape, focal length, arrangement structure and duty cycle of these microlenses can be adjusted to achieve specific optical functions and improve the overall performance and integration of the optical system.

[0117] In this embodiment, the light-homogenizing module 13 includes frosted glass, an engineering diffuser, a diffractive optical element, or a microlens array; or, the light-homogenizing module 13 includes two or more of frosted glass, an engineering diffuser, a diffractive optical element, or a microlens array; or, the light-homogenizing module 13 is a combination of any one of frosted glass, an engineering diffuser, a diffractive optical element, or a microlens array and other lenses. Of course, the light-homogenizing module 13 can also be other optical elements or a combination of optical elements.

[0118] See also Fig. 9 , schematically shows a light-homogenizing module 13, in which a convex lens 131, a concave lens 132, a microlens array 133, and a convex lens 131 are sequentially arranged along the direction of incoming light, wherein: Fig. 9 The middle arrow indicates the direction of incoming light.

[0119] In this embodiment, it is preferred to ensure that the light uniformity of the illuminated area of ​​the inspected component exceeds 98% to facilitate the inspection of the inspected component.

[0120] In one embodiment, the detection light source 100 includes a housing, and the light emitting light source 111 is detachably connected to the housing.

[0121] The light emitting light source 111 is detachably connected to the housing of the detection light source 100, so that different light emitting light sources 111 can be replaced. The light emitting light source 111 is detachably connected to the housing of the detection light source 100. When a certain light emitting light source 111 fails, the failed light emitting light source 111 can be removed and replaced with a light emitting light source 111 that can emit light normally.

[0122] The connection between the light source 111 and the housing can be threaded connection, snap connection, etc. The specific connection form between the light source 111 and the housing is not limited, as long as the light source 111 can be detachably connected to the housing.

[0123] Exemplarily, the detection light source 100 can be connected to an external power source through a control device. When the light source 111 is connected to the shell, each light source 111 can be connected to the external power source through the control device. The control device can control the power supply of the external power source to each light source 111, thereby achieving control of all light sources 111 to emit light according to demand, or control of light sources 111 of a certain wavelength to emit light.

[0124] In one embodiment, the wavelength band emitted by at least one luminous source 111 is between 420 and 520 nm, the wavelength band emitted by at least one luminous source 111 is between 520 and 620 nm, and the wavelength band emitted by at least one luminous source 111 is between 620 and 720 nm.

[0125] In this embodiment, the light emitting module 11 emits light in the visible light band. The number of light sources 111 is at least three, so that at least one light source 111 emits light in the band between 420 and 520 nm, at least one light source 111 emits light in the band between 520 and 620 nm, and at least one light source 111 emits light in the band between 620 and 720 nm.

[0126] In this embodiment, at least one light source 111 is included in three wavelength ranges of 420-520 nm, 520-620 nm, and 620-720 nm, so as to facilitate the detection of customized mobile phone parts with different colors.

[0127] Exemplarily, among the detection light sources 100, one of the light emitting sources 111 emits a wavelength of 480 nm, one of the light emitting sources 111 emits a wavelength of 525 nm, and one of the light emitting sources 111 emits a wavelength of 620 nm.

[0128] Next, the arrangement of the filters 121 is further described. Specifically, it can be divided into the following two embodiments:

[0129] Embodiment 1:

[0130] See also Fig.10 , each filter 121 is distributed in sequence along the first direction, each filter 121 is arranged in parallel and each filter 121 has an angle with the first direction; the light emitted from each light source 111 along the central axis to the corresponding filter 121 can be reflected and converged at the same point. Among them, Fig.10 The direction indicated by the arrow X is the first direction.

[0131] In this embodiment, the filters 121 are arranged in parallel along the first direction to reduce the volume of the detection light source 100; the positions of the light source 111, the filter 121 and the light-averaging module 13 are arranged so that the light emitted from each light source 111 along the central axis toward the corresponding filter 121 can be converged at the same position after reflection, so as to achieve the concentration of the intensity of light sources with different wavelengths.

[0132] Preferably, the angle between the filter 121 and the first direction is 45°.

[0133] The angle between the filter 121 and the first direction is 45°, which facilitates setting the position of the light averaging module 13 inside the detection light source 100, that is, the central axis of the light averaging module 13 is set parallel to the first direction. The angle between the filter 121 and the first direction is preferably 45°, but the angle between the filter 121 and the first direction is not limited to only 45°.

[0134] See also Fig.11, taking the angle between the filter 121 and the first direction as 45° as an example, the light path condition in the detection light source 100 is specifically described.

[0135] Fig.11 It is shown that the number of the light source 111 and the filter 121 are both three. Fig.11 The first direction is the direction indicated by the arrow X. The three light sources 111 are arranged along the first direction. From right to left, the three light sources 111 are respectively the first light source 1111, the second light source 1112, and the third light source 1113. From right to left, the three filters 121 are respectively the first filter 1211, the second filter 1212, and the third filter 1213. The first light source 1111 corresponds to the first filter 1211, the second light source 1112 corresponds to the second filter 1212, and the third light source 1113 corresponds to the third filter 1213.

[0136] The light emitted by the third light source 1113 passes through the collimating module 14 and is emitted to the third filter 1213, and is reflected by the third filter 1213 and is emitted to the light homogenizing module 13. The light emitted by the second light source 1112 passes through the collimating module 14 and is emitted to the second filter 1212, and is reflected by the second filter 1212 and is emitted to the light homogenizing module 13 through the third filter 1213. The light emitted by the first light source 1111 passes through the collimating module 14 and is emitted to the first filter 1211, and is reflected by the first filter 1211 and is emitted to the light homogenizing module 13 through the second filter 1212 and the third filter 1213.

[0137] See also Fig.11 , the dotted line indicates that the light source 111 is emitted along the central axis toward the corresponding filter 121 and then reflected to the light-homogenizing module 13 , and the light reflected by each light source 111 along the central axis toward the corresponding filter 121 converges at the same point.

[0138] Fig.11 In the figure, it is shown that the number of the light sources 111 and the number of the filters 121 are both three. Fig.11 This is just an example, that is, the number of light sources 111 and filters 121 is not limited to three, and can also be other numbers.

[0139] Fig.11 In the embodiment, three light sources 111 are arranged along a first direction. Arranging the multiple light sources 111 in sequence in the first direction is beneficial to reducing the volume of the detection light source 100.

[0140] In this embodiment, according to the distribution of components such as the filter 121 and the light source 111 , the overall shape of the detection light source 100 can be set to be a rectangular parallelepiped.

[0141] See also Fig.12 , which is the use scenario of the detection light source 100 in this embodiment. The detection light source 100 emits detection light, which is irradiated onto the detected object 700. The detected object 700 reflects the light to the lens 500, and then the light is emitted to the camera 600 through the lens 500. For detected objects 700 of different colors, the detection light source 100 can be adjusted to emit lights of different colors, and the lighting angles of lights of different colors are consistent.

[0142] Different colors of the inspected parts 700 are illuminated with different colors of light. If the defective areas of the inspected parts 700 of different colors are of concave-convex structural characteristics, the illumination angles of the lights of different colors are consistent when the position of the detection light source 100 is fixed, so the light and shadow effects of the inspected parts 700 of different colors are consistent. For details, please refer to Fig.17 The detection light source 100 can emit a light beam I and a light beam II, wherein the light beam I and the light beam II are two lights of different colors. The position of the detection light source 100 is fixed, and the position of the detection light source 100 can be set by a robot or other related device. When the light beam I is used to illuminate a detection piece of one color, Fig.17 In (a), the protruding structure produces a shadow area. When the light beam II is used to illuminate the detection piece of another color, Fig.17 In (b), the protruding structure produces a shadow area. The irradiation angles of beam I and beam II are the same. Fig.17 (a) and Fig.17 The convex structure in (b) produces the same shadow area.

[0143] Embodiment 2:

[0144] The direction from the filter module 12 to the light-homogenizing module 13 is the first direction, and each filter 121 has an angle with the first direction, and the angles between each filter 121 and the first direction are different in size; the light emitted by each light source 111 along the central axis to the corresponding filter 121 can converge at the same position after reflection.

[0145] By setting the angles between each filter 121 and the first direction to be different, the installation method of the filter 121 can be expanded, and is not limited to the installation method where each filter 121 is only parallel. In addition, the angles between each filter 121 and the first direction are different, and the angles of each filter 121 are reasonably set, which can further reduce the volume of the detection light source 100.

[0146] By setting the positions of the light source 111, the filter 121 and the light-averaging module 13, the light emitted from each light source 111 along the central axis to the corresponding filter 121 can be gathered at the same position after reflection, so as to achieve the concentration of the intensity of light sources with different wavelengths.

[0147] In this embodiment, see Fig.13, preferably, the following further configuration is adopted: each filter 121 along the direction from the light averaging module 13 to the light filtering module 12 corresponds to each light source 111 along the direction from the light averaging module 13 to the light filtering module 12 one by one; the angle between each filter 121 and the first direction along the direction from the light averaging module 13 to the light filtering module 12 gradually increases; the filter 121 with the largest angle with the first direction is called the distal filter 121; the light source 111 farthest from the light averaging module 13 is the distal light source 111; the light emitted by the distal light source 111 sequentially transmits through other filters 121 except the distal filter 121 and then is emitted to the distal filter 121; wherein, Fig.13 The direction indicated by the arrow X is the first direction. Through the above arrangement, the volume of the detection light source 100 can be further reduced.

[0148] See also Fig.14 ,by Fig.14 As an example, the optical path conditions in the detection light source 100 are specifically described.

[0149] Fig.14 It is shown that the number of the light source 111 and the filter 121 are both three. Fig.14 The first direction is the direction indicated by the arrow X. The three light sources 111 are arranged along the first direction. The three light sources 111 from right to left are respectively the first light source 1111, the second light source 1112, and the third light source 1113. The three filters 121 from right to left are respectively the first filter 1211, the second filter 1212, and the third filter 1213. The first light source 1111 corresponds to the first filter 1211, the second light source 1112 corresponds to the second filter 1212, and the third light source 1113 corresponds to the third filter 1213. The first filter 1211 has the smallest angle with the first direction, and the third filter 1213 has the largest angle with the first direction, wherein the third filter 1213 is a remote filter, and the third light source 1113 is a remote light source.

[0150] The light emitted by the first light source 1111 passes through the collimating module 14 and is emitted to the first filter 1211, and is reflected by the first filter 1211 and is emitted to the light homogenizing module 13. The light emitted by the second light source 1112 passes through the collimating module 14 and is emitted to the first filter 1211, and is transmitted through the first filter 1211 and is emitted to the second filter 1212, and is reflected by the second filter 1212 and is emitted to the light homogenizing module 13 through the first filter 1211. The light emitted by the third light source 1113 passes through the collimating module 14 and is emitted to the first filter 1211 and / or the second filter 1212, and is transmitted through the first filter 1211 and the second filter 1212 and is emitted to the third filter 1213, and is reflected by the third filter 1213 and is emitted to the light homogenizing module 13 through the first filter 1211 and the second filter 1212.

[0151] See also Fig.14 , the dotted line indicates that the light sources 111 (the first light source 1111, the second light source 1112 and the third light source 1113) are radiated along the central axis toward the corresponding filter 121 and then reflected to the light-homogenizing module 13, and the light reflected by each light source 111 along the central axis toward the corresponding filter 121 converges at the same point.

[0152] Fig.14 In the figure, it is shown that the number of the light sources 111 and the number of the filters 121 are both three. Fig.14 This is just an example, that is, the number of light sources 111 and filters 121 is not limited to three, and can also be other numbers.

[0153] Fig.14 In the embodiment, three light sources 111 are arranged along a first direction. Arranging the multiple light sources 111 in sequence in the first direction is beneficial to reducing the volume of the detection light source 100.

[0154] In this embodiment, according to the distribution of components such as the filter 121 and the light source 111 , the overall shape of the detection light source 100 can be set to be a rectangular parallelepiped.

[0155] Please combine Fig.14 See also Fig.15 , the angle relationship between the arrangement spacing of the light source 111 and the filter 121 can be specifically as follows:

[0156] L1, L2, and L3 represent the first filter 1211, the second filter 1212, and the third filter 1213, respectively, wherein L1, L2, and L3 intersect at a point A, and the angle between L2 and the first direction is set to 45°. Fig.15The dotted lines in the figure respectively indicate that the reflected light from each light source 111 along the central axis to the corresponding filter 121 converges at the same point D. From right to left, the three light sources 111 are the first light source 1111, the second light source 1112, and the third light source 1113. The spacing between the central axis of the first light source 1111 and the central axis of the second light source 1112 is X, the distance between the central axis of the second light source 1112 and CD is d, the length of CD is h, AC is perpendicular to CD, DE is perpendicular to AE, the angle between the first filter 1211 and the second filter 1212 is θ, then the calculation formula for the spacing X between the central axis of the first light source 1111 and the central axis of the second light source 1112 and the angle θ between the first filter 1211 and the second filter 1212 is:

[0157] AB=BF=h;

[0158] AC=h+d;

[0159]

[0160] ∠DAE=45°-θ-arcsinh / AD;

[0161] AE = AD × cos ∠DAE;

[0162] DE=AD×sin∠DAE;

[0163] ME = DE / tan (45° + θ);

[0164] AM = AE-ME;

[0165] X=AM×cos(45°-θ)-h.

[0166] In this embodiment, it is preferred that the angle of each filter 121 is adjustable.

[0167] By adjusting the angle of the filter 121 , the reflected light from each light source 111 radiating toward the corresponding filter 121 along the central axis converges at the same point.

[0168] The filter 121 can be connected to the housing through an angle adjustment structure, thereby achieving adjustment of the angle of the filter 121. Regarding the angle adjustment structure of the filter 121, the following structure can be adopted: a first connecting component and a second connecting component are respectively provided on opposite sides of the filter 121, and the first connecting component includes two pins, and the two pins are rotatably connected to the housing of the detection light source 100. The second connecting component includes two pins, and an arc groove is provided on the housing. The two pins of the second connecting component are respectively inserted into the corresponding arc grooves, and a locking structure is provided on the housing. Each pin of the second connecting component corresponds to a locking structure, and the pin is fixed to the arc groove by the locking structure. When the locking structure releases the fixation of the pin, the two pins of the second connecting component can move along the arc groove to adjust the angle of the filter 121.

[0169] Regarding the locking structure, for example, it can be a locking screw, which is threadedly connected to the shell, and one end of the locking screw squeezes the pin of the second connecting component so that the pin of the second connecting component is fixed to the shell.

[0170] An embodiment of the angle adjustment structure of the filter 121 is given above. The specific structure of the angle adjustment structure of the filter 121 is not limited to the above structure content, and other structures that can achieve angle adjustment of the filter 121 can also be used.

[0171] See also Fig.16 , which is the use scenario of the detection light source 100 in this embodiment. The detection light source 100 emits detection light, which is irradiated onto the detected object 700. The detected object 700 reflects the light to the lens 500, and then the light is emitted to the camera 600 through the lens 500. For detected objects 700 of different colors, the detection light source 100 can be adjusted to emit lights of different colors, and the lighting angles of lights of different colors are consistent.

[0172] Different colors of the inspected parts 700 are illuminated with different colors of light. If the defective areas of the inspected parts 700 of different colors are of concave-convex structural characteristics, the illumination angles of the lights of different colors are consistent when the position of the detection light source 100 is fixed, so the light and shadow effects of the inspected parts 700 of different colors are consistent. For details, please refer to Fig.17 The detection light source 100 can emit a light beam I and a light beam II, wherein the light beam I and the light beam II are two lights of different colors. The position of the detection light source 100 is fixed, and the position of the detection light source 100 can be set by a robot or other related device. When the light beam I is used to illuminate a detection piece of one color, Fig.17 In (a), the protruding structure produces a shadow area. When the light beam II is used to illuminate the detection piece of another color, Fig.17 In (b), the protruding structure produces a shadow area. The irradiation angles of beam I and beam II are the same. Fig.17 (a) and Fig.17 The convex structure in (b) produces the same shadow area.

[0173] This embodiment provides a defect detection device, including the detection light source 100 described in any of the above embodiments.

[0174] The optical system of the defect detection device includes a detection light source 100, a lens, and a camera.

[0175] Regarding the detection light source 100 , the specific structure and effect have been described above and will not be described in detail here.

[0176] A lens directs the light reflected from the product into the camera sensor. The lens system can be adjusted to change the field of view and depth of field, enabling the inspection of products of different sizes and types. A camera captures the image of the product.

[0177] The defect detection device provided in this embodiment can detect customized parts of electronic devices (such as battery back covers, etc.), and the electronic devices can be terminal devices with display interfaces such as mobile phones, televisions, monitors, tablet computers, and car computers, or smart display wearable devices such as smart watches and smart bracelets, or communication devices such as servers, storage devices, and base stations, or smart cars, etc. The embodiments of this application do not impose special restrictions on the specific forms of the above-mentioned electronic devices.

[0178] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A detection light source, characterized in that: include: A light-emitting module, comprising a plurality of light sources; A filter module, comprising a plurality of filters, each of which corresponds to one of the light sources, and each of which is used to reflect light of a different wavelength band; The light-evening module is used for evenly distributing light and is arranged at the light-emitting end of the detection light source. The light emitted by the light-emitting light source can be directed to the light-evening module after being reflected by the corresponding filter.

2. The detection light source according to claim 1, characterized in that: The filters are distributed in sequence along the first direction, are arranged in parallel and have an angle with the first direction; the light emitted from each light source along the central axis to the corresponding filter can be gathered at the same position after reflection.

3. The detection light source according to claim 2, characterized in that: The angle between the filter and the first direction is 45°.

4. The detection light source according to claim 1, characterized in that: The direction from the filter module to the light-averaging module is the first direction, and each filter has an angle with the first direction, and the angles between each filter and the first direction are different; the light emitted by each light source along the central axis to the corresponding filter can converge at the same position after reflection.

5. The detection light source according to claim 4, characterized in that: The angle between each filter and the first direction gradually increases along the direction from the light averaging module to the light filtering module. The filter with the largest angle with the first direction is called a distal filter. Each filter along the direction from the light averaging module to the light filtering module corresponds to each light source one by one. The light source farthest from the light averaging module is the distal light source. The light energy emitted by the distal light source is sequentially transmitted through the other filters except the distal filter and then emitted to the distal filter.

6. The detection light source according to claim 4, characterized in that: The angle of the filter is adjustable.

7. The detection light source according to any one of claims 1 to 6, characterized in that: The detection light source further comprises a collimating module for focusing light, wherein the collimating module is arranged between the light emitting module and the filter module, and the light emitted by the light emitting light source passes through the collimating module and is emitted to the corresponding filter.

8. The detection light source according to any one of claims 1 to 6, characterized in that: The detection light source comprises a housing, and the light emitting light source is detachably connected to the housing.

9. The detection light source according to any one of claims 1 to 6, characterized in that: The wavelength band emitted by at least one of the luminescent light sources is between 420 and 520 nm, the wavelength band emitted by at least one of the luminescent light sources is between 520 and 620 nm, and the wavelength band emitted by at least one of the luminescent light sources is between 620 and 720 nm.

10. A defect detection device, characterized in that: The detection light source comprises the detection light source as described in any one of claims 1-9.

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