Light source device and visual inspection device

Abstract

The embodiment of the utility model provides a light source device which comprises a light-emitting chip, a collecting assembly and an angle expanding assembly, the light-emitting chip is used for emitting illumination light, the collecting assembly is located in a light path of the illumination light, the collecting assembly is used for collimating the illumination light, and the angle expanding assembly comprises a plurality of cylindrical lenses arranged in an array mode. The cylindrical lens is used for receiving the collimated illumination light and expanding the emergent angle of the illumination light. According to the light source device, the light emitting chip emits the illumination light, the collection assembly collimates the illumination light, and then the angle expansion assembly expands the emergent angle of the illumination light, so that the light source device has a larger emergent angle, and the visual detection device can have a larger detection range. Meanwhile, a plurality of cylindrical lenses of the angle expansion assembly can emit a plurality of more uniform strip-shaped illumination light rays, so that the detection precision of the visual detection device can be ensured, and the application range of the visual detection device is greatly expanded. The embodiment of the utility model further provides a visual inspection device.

Description

Technical Field

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

[0002] Visual inspection devices are used in product quality inspection, automated guidance, etc. They can be used in conjunction with automated devices. For example, visual inspection devices can be used in conjunction with robots to identify and sort goods. Visual inspection devices require light source devices to provide a stable and uniform lighting environment to ensure their own recognition accuracy.

[0003] In the prior art, the low-angle illumination of a bar light source is an ideal illumination for detecting the edges of metal surfaces and protruding printing and damage. However, the uniformity of the illumination light emitted by the existing bar light sources is poor and the illumination range is narrow, which affects the detection accuracy and scope of application of the visual inspection device. In addition, some bar light sources are formed by arranging multiple light sources in a strip shape, which is limited by the volume and distribution of the light sources. The length of the bar light source is very long and the volume is large, and its weight and volume seriously affect the scope of application of the visual inspection device. At the same time, as the number of light sources increases, the failure rate of the bar light source also increases. Utility Model Content

[0004] The embodiments of the present application provide a light source device and a visual detection device to at least partially improve the above technical problems.

[0005] In a first aspect, an embodiment of the present application provides a light source device, comprising a light-emitting chip, a collecting component and an angle expansion component, wherein the light-emitting chip is used to emit illumination light, the collecting component is located in the optical path of the illumination light, the collecting component is used to collimate the illumination light, and the angle expansion component comprises a plurality of cylindrical lenses arranged in an array, the cylindrical lenses are used to receive the collimated illumination light and expand the emission angle of the illumination light.

[0006] In one embodiment, there are multiple light-emitting chips, and there are multiple collecting components. The multiple collecting components and the multiple light-emitting chips are arranged in a one-to-one correspondence.

[0007] In one embodiment, the collecting component includes a first collecting lens and a second collecting lens, the first collecting lens is located in the optical path of the illumination light emitted by the light-emitting chip, and the first collecting lens is used to collimate the illumination light, and the second collecting lens is located in the optical path of the illumination light emitted from the first collecting lens and is used to collimate the illumination light.

[0008] In one embodiment, the wavelength bands of the illumination lights emitted by the multiple light-emitting chips are the same.

[0009] In one embodiment, the width of the cylindrical lens is 2 mm-3 mm.

[0010] In one embodiment, the cylindrical lens is an aspherical lens.

[0011] In one embodiment, the cylindrical lens satisfies the following relationship:

[0012]

[0013] Among them, z is the sag of the cylindrical lens, r is the radius of curvature at the vertex of the cylindrical lens, k is the cone coefficient, p is the radial coordinate of the cylindrical lens in the direction perpendicular to the optical axis, and D, E, F and G are all high-order non-curved surface coefficients of the cylindrical lens.

[0014] In one embodiment, the light source device further includes a light homogenizer, which is disposed in the light path between the collecting component and the angle expansion component.

[0015] In one embodiment, the illumination light has an exit angle ranging from 0° to 20° when it is emitted from the angle expansion component.

[0016] In a second aspect, an embodiment of the present application provides a visual detection device, comprising the light source device of the first aspect mentioned above.

[0017] The light source device and visual detection device provided by the embodiments of the present application have a light emitting chip that emits illumination light, a collecting component that collimates the illumination light, and then expands the emission angle of the illumination light through an angle expansion component, so that the light source device has a larger emission angle, and thus the visual detection device can have a larger detection range. At the same time, the multiple cylindrical lenses of the angle expansion component can emit more uniform multiple strips of illumination light, which can ensure the detection accuracy of the visual detection device. In addition, the cylindrical lenses arranged in an array are more concentrated, and the structure of the light source device is simple, which greatly reduces the volume of the light source device, which is conducive to improving the scope of application and reliability of the visual detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of a visual inspection device proposed in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of a light source device proposed in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of another light source device proposed in an embodiment of the present application;

[0022] Figure 4 A luminance distribution diagram of an illumination light proposed in an embodiment of the present application;

[0023] Figure 5 A comparison diagram of the illumination intensity of an illumination light passing through a cylindrical lens and an illumination light not passing through a cylindrical lens proposed in an embodiment of the present application;

[0024] Figure 6 A radar distribution diagram of the illuminance of an illumination light proposed in an embodiment of the present application;

[0025] Figure 7 This is a schematic structural diagram of another light source device proposed in an embodiment of the present application.

[0026] Figure numerals: visual detection device 100, light source device 10, light-emitting chip 11, first light-emitting chip 111, second light-emitting chip 112, circuit board 113, collecting component 12, first collecting lens 121, second collecting lens 122, angle expansion component 13, cylindrical lens 131, substrate 132, cylinder 133, light homogenizer 14, visualization device 20. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the implementation mode of the present application. Obviously, the described implementation mode is only a part of the implementation mode of the present application, not all the implementation modes. Based on the implementation mode in the present application, all other implementation modes obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0028] In this application, unless otherwise clearly specified or limited, the terms "installation", "connection", "fixation" 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, or it can be internal communication between two elements, or it can be only surface contact, or surface contact connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In addition, the terms "first", "second", etc. are only used to distinguish descriptions and cannot be understood as specific or special structures. The descriptions of the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0030] Example

[0031] This embodiment provides a visual inspection device 100, see Figure 1 The visual inspection device 100 illuminates the target object with light, and uses the visualization device 20 (such as an industrial camera, lens, light source, etc.) to convert the target object into an image signal, which is then transmitted to a computer for digital processing to obtain a digital signal that can be used by subsequent devices. The visual inspection device 100 can be applied to product quality inspection, automated guidance, process monitoring and control, safety inspection, etc.

[0032] Furthermore, the visual inspection device 100 may include a light source device 10 and a visualization device 20, wherein the light source device 10 emits illumination light and the visualization device 20 obtains information about the object under the illumination light. The visual inspection device 100 may perform detection and comparison, and judge and select objects with surface defects.

[0033] In another embodiment, the visual inspection device 100 can also help automated equipment such as robots to perceive surrounding objects and obtain their own positions, etc., thereby ensuring the safety and convenience of using the automated equipment.

[0034] For more details, see Figure 1 as well as Figure 2 The light source device 10 may include a light emitting chip 11, a collecting component 12 and an angle expansion component 13, wherein the collecting component 12 is disposed in the optical path between the light emitting chip 11 and the angle expansion component 13. In other words, the collecting component 12 is located in the optical path of the illumination light emitted by the light emitting chip 11, and the angle expansion component 13 is located in the optical path of the illumination light emitted by the collecting component 12.

[0035] The light emitting chip 11 is used to emit illumination light. The light emitting chip 11 may be a light emitting diode (LED) chip, etc. The LED chip emits excitation light. The LED chip has the characteristics of low cost and long life, and can be selected and designed according to specific needs and usage scenarios. In one embodiment, the light emitting chip 11 may be a white light emitting chip, an ultraviolet light emitting chip, or an infrared light emitting chip. The illumination light emitted by the light emitting chip 11 may be white light, ultraviolet light, or infrared light. The spectral distribution of white light covers the spectral range from ultraviolet to visible light and infrared. It provides illumination light with corresponding different characteristics according to different detection needs.

[0036] It is understandable that the type of the light-emitting chip 11 is selected according to specific implementation requirements and implementation scenario requirements. This implementation does not limit the specific type of the light-emitting chip 11. For example, the light-emitting chip 11 can be a near-infrared light-emitting chip, etc., for detection by infrared detection equipment.

[0037] In another embodiment, the light emitting chip 11 may also be a laser light source. The light source 21 emits laser light, which has the characteristics of high brightness, strong directionality, and small size.

[0038] In this example, please continue to refer to Figure 2 , the number of light-emitting chips 11 is multiple, and the multiple light-emitting chips 11 can be arranged on the surface of the same circuit board 113, and the circuit board 113 is electrically connected to the multiple light-emitting chips. The circuit board 113 can not only fix the multiple light-emitting chips 11, but also supply power and / or transmit signals to the light-emitting chips 11. The multiple light-emitting chips 11 can emit illumination lights of multiple different bands, thereby ensuring that different illumination areas of the light source device 10 have different illumination effects. In a more specific embodiment, the light-emitting chip 11 may include a first light-emitting chip 111 and a second light-emitting chip 112, and the first light-emitting chip 111 and the second light-emitting chip 112 are both arranged on the surface of the same circuit board 113. The illumination lights emitted by the multiple light-emitting chips 11 have the same band, such as white illumination light or light beams of other bands. Exemplarily, the light-emitting chip 11 emits white illumination light, and its band can be 380nm-780nm. The multiple light-emitting chips 11 emit multiple beams of illumination light, which greatly improves the light intensity of the illumination light emitted by the light source device 10, thereby improving its illumination range and illumination effect.

[0039] In another embodiment, the first light-emitting chip 111 is used to emit illumination light of a first wavelength band, and the second light-emitting chip 112 is used to emit illumination light of a second wavelength band. The first light-emitting chip 111 can emit blue illumination light, and its first wavelength band is 450nm-500nm. The second light-emitting chip 112 can emit red illumination light, and its second wavelength band is 620nm-760nm. Under the adjustment of the collecting component 12 and the angle expansion component 13, the illumination range of the light source device 10 has two different illumination effects to adapt to the illumination effects of different areas.

[0040] In this embodiment, the collecting component 12 is located in the optical path of the illumination light, and the collecting component 12 can be configured as a collimating lens, so that the collecting component 12 can be used to collimate the illumination light. The illumination light emitted by the collecting component 12 has been collimated, and the collimated illumination light will form a parallel light beam, and the angle between the light rays is very small, close to zero. The collecting component 12 effectively focuses the illumination light and reduces the dispersion effect of the illumination light, so that more light is gathered on the angle expansion component 13, reducing energy loss.

[0041] For more details, please refer to Figure 3 The collecting component 12 may include a first collecting lens 121 and a second collecting lens 122. The first collecting lens 121 is located in the optical path of the illumination light emitted by the light-emitting chip 11, and the first collecting lens 121 is used to collimate the illumination light. The second collecting lens 122 is located in the optical path of the illumination light emitted from the first collecting lens 121, and the second collecting lens 122 is used to collimate the illumination light. The first collecting lens 121 and the second collecting lens 122 cooperate with each other so that the illumination light can be fully collimated, further improving the collimation effect of the collecting component 12. At the same time, compared with a single collecting lens, the arrangement of multiple collecting lenses cooperating with each other can better control the direction, intensity, distribution, etc. of the light to meet the needs of specific applications. The two collecting lenses can also reduce the requirements for the lens process and further improve the production yield.

[0042] In one embodiment, please refer to Figure 2 , the collecting component 12 may include only one collecting lens. The relative position, optical parameters, etc. of the collecting lens are selected and designed according to the specific implementation situation, and then, the illumination light can be collimated into a parallel light beam through the collecting lens, which effectively reduces the dispersion effect of the illumination light and reduces energy loss. In addition, the provision of only one collecting lens can also reduce the volume of the light source device 10, which is conducive to expanding the application of the light source device 10 in a small space.

[0043] It is understandable that the collecting assembly 12 can be configured with more collecting lenses, such as a third collecting lens, a fourth collecting lens, etc., in addition to the first collecting lens 121 and the second collecting lens 122. The collecting assembly 12 has more collecting lenses that cooperate with each other, further improving the collimation effect of the collecting assembly 12.

[0044] In one embodiment, when there are multiple light-emitting chips 11, there may also be multiple collecting components 12, and multiple collecting components 12 are arranged in one-to-one correspondence with multiple light-emitting chips 11. Each collecting component 12 can collimate the illumination light emitted by the corresponding light-emitting chip 11, and this arrangement can improve the collimation effect of the collecting component 12, so that the illumination light can meet subsequent use requirements.

[0045] In this example, please continue to refer to Figure 2 , the angle extension component 13 includes a plurality of cylindrical lenses 131 arranged in an array. In other words, the angle extension component 13 includes a substrate 132 in addition to the cylindrical lenses 131. The plurality of cylindrical lenses 131 are arranged on the surface of the substrate 132. The substrate 132 and the plurality of cylindrical lenses 131 are integrally formed to avoid the gap between the two hindering the transmission of light. The substrate 132 can provide a highly flat surface for the cylindrical lenses 131 to be distributed and arranged, thereby enhancing the optical consistency of the plurality of cylindrical lenses 131, that is, the plurality of cylindrical lenses 131 have the same effect. At the same time, the substrate 132 can connect and support the plurality of cylindrical lenses 131, thereby improving the structural strength of the plurality of cylindrical lenses 131.

[0046] Furthermore, the cylindrical lens 131 can be configured as a columnar structure extending in a certain direction, and the cylindrical lens 131 is provided with a cylindrical surface 133, and the cylindrical surface 133 is configured as the light incident surface of the illumination light, that is, the cylindrical surface 133 is arranged toward the collecting component 12. The cylindrical lens 131 is used to receive the collimated illumination light and expand the emission angle of the illumination light. The illumination light collimated by the collecting component 12 is emitted into the cylindrical lens 131, and the illumination light is refracted when it is incident on the cylindrical lens 131, and the refraction will change its angle in the cylindrical lens 131. As the angle of the illumination light changes, the cylindrical lens 131 can produce a converging or diverging effect on the illumination light. Among them, the cylindrical lens 131 is implemented in the specific role of the illumination light, and the relative position between the actual imaging surface of the illumination light and the focus of the cylindrical lens 131 is affected. Exemplarily, in order to enable the visual inspection device 100 to have a larger detection range, the imaging surface of the light spot is set on the side of the focus of the cylindrical lens 131 away from the cylindrical lens 131, and the distance between the imaging surface and the cylindrical lens 131 is set far enough, so that the cylindrical lens 131 can play a divergent role, and the farther the distance, the greater the divergent effect. The illumination light is diffused in all directions, so that the light source device 10 has a larger emission angle, and the visual inspection device 100 can have a larger detection range.

[0047] It is understandable that in this embodiment, different imaging effects of the illumination light can be adjusted by adjusting the relative position between the surface of the object and the focus of the cylindrical lens 131, so that the illumination light can adapt to the surfaces of different objects. For example, in order to reduce the range of the light spot, the surface of the object can be set adjacent to the focus of the cylindrical lens 131, and the cylindrical lens 131 can play a converging role to adapt to different implementation situations.

[0048] In one embodiment, a plurality of cylindrical lenses 131 are distributed and arranged along a direction perpendicular to the optical axis of the illumination light, that is, the distribution direction of the plurality of cylindrical lenses 131 is perpendicular to the optical axis of the illumination light. The optical axis refers to the center line of the illumination light. The vertical arrangement can ensure that the emitted light of the cylindrical lens 131 is emitted in a predetermined direction, and the predetermined direction may be the emission direction of the illumination light emitted by the light-emitting chip 11, and the illumination light is irradiated on the surface of a specified object, so as to avoid the light path of the illumination light being too complicated and reducing the illumination effect of the illumination light, and make the emission direction and imaging range of the illumination light more controllable. It is understandable that in some other cases, the illumination effect of the imaging spot of the illumination light can also be changed by adjusting the angle between the distribution direction of the plurality of cylindrical lenses 131 and the optical axis direction of the illumination light.

[0049] In one embodiment, please refer to Figure 2 , the width of the cylindrical lens 131 is 2mm-3mm, and the width of the cylindrical lens 131 is as follows Figure 2 As shown in the distance d in . The cylindrical lens 131 should not be set too wide or too narrow. A cylindrical lens 131 that is set too wide has poor light divergence and uniform light effects, and the uniformity of the emitted light spot is poor. Although a cylindrical lens 131 that is set too narrow can make the imaging effect of the strip light spot more precise and detailed, and the uniformity is better, the cost will also increase accordingly. A cylindrical lens 131 with an appropriate width can ensure its light divergence strip light spot and uniform light effects while reducing costs to adapt to more implementation scenarios.

[0050] In this example, please continue to refer to Figure 2, the size of the angle extension component 13 can be designed and selected according to the specific implementation requirements such as the size and uniformity of the imaging spot, and this embodiment does not limit it. In one embodiment, the length of the angle extension component 13 can be 400mm-500mm, the width is 40mm-50mm, and the thickness is 2mm-3mm. Exemplarily, the length of the angle extension component 13 is 472.6mm, the width is 44mm, and the thickness is 2.95mm. A plurality of cylindrical lenses 131 are distributed along the length direction of the angle extension component 13, and each cylindrical lens 131 extends along the width direction of the angle extension component 13. Furthermore, the size of the angle extension component 13 will be affected by the size and number of the cylindrical lenses 131, and the cylindrical lenses 131 will change according to the subsequent light path usage requirements. Therefore, its length and width should not be set too large or too small, and both the length and width being set too large or too small will affect the imaging effect of the subsequent light spot. The thickness of the angle extension component 13 affects its own strength, thermal conductivity, and light transmittance, etc., which will also affect the propagation of the illumination light, and should not be set too large or too small. An angle extension component 13 of appropriate size can balance the subsequent imaging spot size, spot distribution, etc., improve the uniformity of the spot, etc., to ensure that the subsequent imaging spot meets the subsequent use requirements. At the same time, an angle extension component 13 of appropriate size can also take into account structural strength, thermal conductivity, etc., to improve the service life and use effect of the visual inspection device 100.

[0051] In this example, please continue to refer to Figure 2 , the cylindrical lens 131 satisfies the following relationship:

[0052]

[0053] Among them, z is the vector height of the cylindrical lens 131, r is the radius of curvature at the vertex of the cylindrical lens 131, k is the cone coefficient, p is the radial coordinate of the cylindrical lens 131 in the direction perpendicular to the optical axis, and D, E, F and G are all high-order non-curved surface coefficients of the cylindrical lens 131.

[0054] In one embodiment, r = 3.2610333468509;

[0055] k = -5.66849073522799E-01;

[0056] D = -1.97637894359443E-03;

[0057] E = -3.71108986016198E-05;

[0058] F = -5.47097850331272E-07;

[0059] G = -3.91945561354760E-08.

[0060] Thus, the relationship between the radial coordinate of the cylindrical lens 131 in the direction perpendicular to the optical axis and its own sagittal height can be calculated, and the curvature of the cylindrical surface 133 of the cylindrical lens 131 can be simulated, and then the specific parameter value of the cylindrical lens 131 can be obtained. The cylindrical lens 131 thus obtained can be an aspherical lens, that is, the cylindrical surface 133 of the cylindrical lens 131 is an aspherical surface. The aspherical lens can ensure the subsequent imaging spot size, improve the uniformity of the spot, and thus improve the illumination effect of the light source device 10.

[0061] In one embodiment, the light source device 10 may further include a display screen (not shown in the figure), and the cylindrical lens 131 emits the illumination light to the display screen, and the illumination light forms a light spot on the display screen. Figure 4 , Figure 4 is the illuminance distribution diagram of the illumination light emitted by the cylindrical lens 131, and its horizontal and vertical axes are two vertical directions in the illumination screen, and the horizontal and vertical axes are both directional coordinates, and the unit is mm. Figure 4 The whiter the color, the higher the illumination in that area. The darker or lighter the color, the lower the illumination in that area. Figure 4 It can be seen that the light emitted from the cylindrical lens 131 is a stripe-shaped light spot, and its distribution is very uniform.

[0062] Figure 5 : is a luminance distribution diagram of the illumination light emitted by the cylindrical lens 131 , wherein the abscissa is displacement in mm, and the ordinate is luminance in lux. Figure 5 The solid line in FIG. 1 is the illuminance distribution of the illumination light when it does not pass through the cylindrical lens 131, and the dotted line is the illuminance distribution of the illumination light when it passes through the cylindrical lens 131. Figure 5 It can be seen that the illumination light is a very narrow light spot with poor uniformity before passing through the cylindrical lens 131. After passing through the cylindrical lens 131, the illumination light becomes a very wide light spot with high uniformity.

[0063] See also Figure 6 , Figure 6 is a radar distribution diagram of the illumination intensity of the illumination light emitted by the angle expansion component 13, and its polar coordinate system represents the angle value. Figure 6 It can be seen that, with the center point of the radar image as a reference, the irradiation light is a strip-shaped light spot with gradually decreasing illumination from the center point to the outside. Figure 6 It can be seen that the illumination distribution is very uniform. Figure 6 It can also be seen that the illumination light emitted from the angle extension component has an emission angle range of 0-20°, and the illumination light emitted from the angle extension component 13 is in the long axis direction (refer to Figure 6In other words, the angle expansion component 13 can expand the range of the emission angle of the illumination light to 0-20°, so that the light source device 10 has a larger emission angle, and the visual detection device 100 can have a larger detection range. At the same time, the illumination light emitted by the angle expansion component 13 is Figure 6 The full angle of the emission angle (as shown in the L2 direction in the figure) is 5°, indicating that the illumination light expanded by the angle expansion component 13 is still a strip of light, which meets the subsequent use requirements.

[0064] It has been measured that using Figure 5 and Figure 6 The illuminance distribution diagram is measured in the figure, and the difference percentage between the illuminance of each area and the average illuminance is further converted to obtain that the light uniformity of the illumination light emitted by the angle expansion component 13 is greater than or equal to 90%.

[0065] In this example, see Figure 7 The light source device 10 may further include a light homogenizer 14, which may be a diffuser or a single compound eye or a double compound eye, etc. The light homogenizer 14 may modulate the light beam emitted by the light source to form a continuous specific light field distribution within the required field of view angle range to make the light uniform. The light homogenizer 14 is disposed in the light path between the collecting component 12 and the angle expansion component 13. The light homogenizer 14 may receive the light emitted by the collecting component 12 and homogenize the light, and the light homogenizer 14 transmits a more uniform illumination light out of the angle expansion component 13, further improving the uniformity of the light and improving the detection accuracy of the visual detection device 100.

[0066] In one embodiment, a plurality of light emitting chips 11 emit light of a plurality of different wavelengths, and the light homogenizer 14 receives a plurality of light beams, mixes the light beams and emits them. Exemplarily, the light emitting chip 11 also includes a third light emitting chip 11, and the first light emitting chip 111 can emit yellow-green illumination light, and its first wavelength is 580-560nm. The second light emitting chip 112 can emit red illumination light, and its second wavelength is 620nm-760nm. The third light emitting chip can emit blue illumination light. The light homogenizer receives blue illumination light, yellow-green illumination light and red illumination light, and combines the light into white light and emits it. While the light homogenizer realizes white light illumination, it reduces the requirements of the light emitting chip 11.

[0067] In the light source device 10 and the visual detection device 100 provided in this embodiment, the light emitting chip 11 emits illumination light, the collecting component 12 collimates the illumination light, and then expands the emission angle of the illumination light through the angle expansion component 13, so that the light source device 10 has a larger emission angle, and thus the visual detection device 100 can have a larger detection range. At the same time, the multiple cylindrical lenses 131 of the angle expansion component 13 can emit more uniform multiple strips of illumination light, which can ensure the detection accuracy of the visual detection device 100. In addition, the cylindrical lenses 131 arranged in an array are more concentrated, and the structure of the light source device 10 is simple, which greatly reduces the volume of the light source device 10, which is conducive to improving the scope of application and reliability of the visual detection device 100.

[0068] The above implementation modes 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 implementation modes, a person skilled in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various implementation modes of the present application, and should all be included in the protection scope of the present application.

Claims

1. A light source device, characterized in that: include: A light-emitting chip, the light-emitting chip is used to emit illumination light; A collecting component, the collecting component is located in the optical path of the illumination light, and the collecting component is used to collimate the illumination light; as well as An angle expansion component, the angle expansion component includes a plurality of cylindrical lenses arranged in an array, the cylindrical lenses are used to receive the collimated illumination light and expand the emission angle of the illumination light.

2. The light source device according to claim 1, characterized in that: There are multiple light-emitting chips, and there are multiple collecting components. The multiple collecting components and the multiple light-emitting chips are arranged in a one-to-one correspondence.

3. The light source device according to claim 2, characterized in that: The collecting component includes a first collecting lens and a second collecting lens. The first collecting lens is located in the optical path of the illumination light emitted by the light-emitting chip and is used to collimate the illumination light. The second collecting lens is located in the optical path of the illumination light emitted from the first collecting lens and is used to collimate the illumination light.

4. The light source device according to claim 2, characterized in that: The illumination lights emitted by the plurality of light-emitting chips have the same wavelength band.

5. The light source device according to claim 1, characterized in that: The width of the cylindrical lens is 2mm-3mm.

6. The light source device according to claim 1, characterized in that: The cylindrical lens is an aspherical lens.

7. The light source device according to claim 6, characterized in that: The cylindrical lens satisfies the following relationship: Among them, z is the vector height of the cylindrical lens, r is the radius of curvature at the vertex of the cylindrical lens, k is the cone coefficient, p is the radial coordinate of the cylindrical lens in the direction perpendicular to the optical axis, and D, E, F and G are all high-order non-curved surface coefficients of the cylindrical lens.

8. The light source device according to claim 1, characterized in that: The light source device further comprises a light homogenizer, which is arranged in the light path between the collecting component and the angle expansion component.

9. The light source device according to any one of claims 1 to 8, characterized in that: The illumination light has an emission angle range of 0-20° when emitted from the angle expansion component.

10. A visual inspection device, characterized in that: Comprising the light source device as described in any one of claims 1-9.

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