Image sensor

Abstract

The present invention provides an image sensor. The image sensor includes: a frame; a PCB board, the PCB board being disposed within the frame; a lens structure, the lens structure being disposed within the frame, the lens structure being spaced apart from the PCB board, and the PCB board being located in the extension direction of the optical axis of the lens structure; and a light source structure, the light source structure being disposed on a side of the lens structure away from the PCB board, the light source structure including at least one first light source and at least one second light source, the first light source and the second light source being respectively located on either side of the lens structure. A scanning area of ​​the image sensor is located on a side of the light source structure away from the lens structure, and an irradiation area of ​​the image sensor irradiated by the first light source at least partially overlaps with an irradiation area of ​​the image sensor irradiated by the second light source, forming an overlapping area. The present invention solves the problem of difficulty in detecting foreign objects in image sensors in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of sensing device imaging, and in particular to an image sensor. Background Art

[0002] Industrial intelligence is experiencing explosive growth. Machine vision, which mimics biological visual imaging and information processing, helps robots extract, process, and understand information, enabling accurate, efficient, and safe automated operations. The importance of machine vision lies primarily in guiding positioning, appearance inspection, high-precision monitoring, and image recognition. In industrial automated inspection, the demand for detecting minute defects is increasing while improving efficiency, and this market is expected to continue to expand. Existing image sensors require sufficiently strong light intensity to detect foreign objects on the surface of a workpiece during actual testing.

[0003] That is to say, the image sensor in the prior art has the problem of difficulty in detecting foreign objects. Summary of the Invention

[0004] The main purpose of the present invention is to provide an image sensor to solve the problem of difficulty in detecting foreign objects in image sensors in the prior art.

[0005] To achieve the above-mentioned objectives, the present invention provides an image sensor, comprising: a frame; a PCB board, the PCB board being disposed within the frame; a lens structure, the lens structure being disposed within the frame, the lens structure being spaced apart from the PCB board, and the PCB board being located in an extension direction of an optical axis of the lens structure; a light source structure, the light source structure being disposed on a side of the lens structure away from the PCB board, the light source structure comprising at least one first light source and at least one second light source, the first light source and the second light source being respectively located on either side of the lens structure, a scanning area of ​​the image sensor being located on a side of the light source structure away from the lens structure, and an irradiation area of ​​the image sensor irradiated by the first light source at least partially overlaps with an irradiation area of ​​the image sensor irradiated by the second light source to form an overlapping area.

[0006] Furthermore, the first light source and the second light source are symmetrically arranged on both sides of the lens structure.

[0007] Furthermore, in the direction of the line connecting the first light source and the second light source, the length of the overlapping area is greater than or equal to 2.4 mm and less than or equal to 2.6 mm.

[0008] Furthermore, the image sensor also includes a shell, and the frame and light source structure are both located inside the shell. The shell has a scanning platform, and the scanning platform has a scanning area. The angle between the first light source and the scanning platform is greater than or equal to 5 degrees and less than or equal to 30 degrees; the angle between the second light source and the scanning platform is greater than or equal to 5 degrees and less than or equal to 30 degrees.

[0009] Furthermore, the beam width of the first light source is greater than or equal to 5 mm and less than or equal to 7 mm; the beam width of the second light source is greater than or equal to 5 mm and less than or equal to 7 mm.

[0010] Furthermore, the illumination width of the first light source on the scanning platform is greater than or equal to 24 mm and less than or equal to 25.5 mm; the illumination width of the second light source on the scanning platform is greater than or equal to 24 mm and less than or equal to 25.5 mm.

[0011] Furthermore, the distance between the first light source and the scanning platform is greater than or equal to 5 mm and less than or equal to 40 mm; the distance between the second light source and the scanning platform is greater than or equal to 5 mm and less than or equal to 40 mm.

[0012] Furthermore, the light source structure also includes a moving device, which is movably arranged on the frame. There are multiple moving devices, and the first light source and the second light source are respectively arranged on different moving devices, so that the first light source and the second light source can be independently adjusted by the moving device.

[0013] Furthermore, the image sensor further includes a plurality of photoelectric conversion chips, which are arranged on the PCB board at intervals along the extension direction of the PCB board, and the scanning areas of two adjacent photoelectric conversion chips at least partially overlap.

[0014] Furthermore, there are multiple lens structures, and the multiple lens structures are arranged in a one-to-one correspondence with the photoelectric conversion chip. The first light source and the second light source are arranged on both sides of each lens structure.

[0015] According to the technical solution of the present invention, the image sensor includes a frame, a PCB board, a lens structure and a light source structure, wherein the PCB board is arranged in the frame; the lens structure is arranged in the frame, the lens structure and the PCB board are spaced apart, and the PCB board is located in the extension direction of the optical axis of the lens structure; the light source structure is arranged on a side of the lens structure away from the PCB board, the light source structure includes at least one first light source and at least one second light source, the first light source and the second light source are respectively located on both sides of the lens structure, the scanning area of ​​the image sensor is located on a side of the light source structure away from the lens structure, and the irradiation area of ​​the first light source irradiating the scanning area of ​​the image sensor at least partially overlaps with the irradiation area of ​​the second light source irradiating the scanning area of ​​the image sensor to form an overlapping area.

[0016] The first and second light sources are located on either side of the lens structure, respectively, and the scanning area of ​​the image sensor is located on the side of the light source structure away from the lens structure. This arrangement facilitates uniform illumination of the scanning area by the first and second light sources, making the brightness of the scanning area more uniform. It also allows light reflected from the scanning area to be directed toward the lens structure, thereby transmitting image information to a PCB board corresponding to the lens structure, ensuring stable image transmission. The illumination area of ​​the image sensor's scanning area by the first light source at least partially overlaps with the illumination area of ​​the image sensor's scanning area by the second light source, forming an overlapping area. This allows the first and second light sources to partially overlap in the scanning area, making the brightness of the overlapping area brighter and increasing the brightness of the surrounding area of ​​the overlapping area, thereby facilitating the image sensor's detection of foreign objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A schematic structural diagram of an image sensor according to an optional embodiment of the present invention is shown;

[0019] Figure 2 Shown Figure 1 The relationship between the illumination width of the image sensor and the illumination intensity;

[0020] Figure 3 Shown Figure 1 Detecting an image when the distance between the first light source and the second light source and the scanning platform is 25 mm;

[0021] Figure 4 Shown Figure 1 Detecting an image when the distance between the first light source and the second light source and the scanning platform is 40 mm;

[0022] Figure 5 Shown Figure 1 A diagram showing the relationship between the distance between the light source structure and the scanning platform and the illumination intensity.

[0023] The above drawings include the following reference numerals:

[0024] 10. Frame; 20. PCB board; 30. Lens structure; 40. First light source; 50. Second light source; 60. Scanning platform; 70. Photoelectric conversion chip. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0027] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0028] In order to solve the problem that image sensors in the prior art have unclear foreign body detection, the present invention provides an image sensor.

[0029] like Figures 1 to 5 As shown, the image sensor includes a frame 10, a PCB board 20, a lens structure 30 and a light source structure, the PCB board 20 is arranged in the frame 10; the lens structure 30 is arranged in the frame 10, the lens structure 30 and the PCB board 20 are spaced apart, and the PCB board 20 is located in the extension direction of the optical axis of the lens structure 30; the light source structure is arranged on the side of the lens structure 30 away from the PCB board 20, the light source structure includes at least one first light source 40 and at least one second light source 50, the first light source 40 and the second light source 50 are respectively located on both sides of the lens structure 30, the scanning area of ​​the image sensor is located on the side of the light source structure away from the lens structure 30, the illumination area of ​​the first light source 40 irradiating the scanning area of ​​the image sensor and the illumination area of ​​the second light source 50 irradiating the scanning area of ​​the image sensor at least partially overlap to form an overlapping area.

[0030] The first light source 40 and the second light source 50 are respectively located on either side of the lens structure 30, and the scanning area of ​​the image sensor is located on the side of the light source structure away from the lens structure 30. This arrangement facilitates uniform illumination of the scanning area by the first light source 40 and the second light source 50, making the brightness of the scanning area more uniform. At the same time, it allows the light reflected from the scanning area to be directed toward the lens structure 30, thereby transmitting the image information to the PCB board 20 corresponding to the lens structure 30, thereby ensuring the stability of image transmission. The illumination area of ​​the scanning area of ​​the image sensor by the first light source 40 and the illumination area of ​​the scanning area of ​​the image sensor by the second light source 50 at least partially overlap to form an overlapping area, so that the first light source 40 and the second light source 50 partially overlap in the scanning area, making the brightness of the overlapping area brighter and improving the brightness of the surrounding area of ​​the overlapping area, thereby facilitating the image sensor's detection of foreign objects.

[0031] like Figure 1 As shown, the first light source 40 and the second light source 50 are symmetrically arranged on either side of the lens structure 30. This arrangement ensures that the distance between the first light source 40 and the scanning area is the same as the distance between the second light source 50 and the scanning area, facilitating uniform illumination of the scanning area by the first light source 40 and the second light source 50, so that the first light source 40 and the second light source 50 can illuminate the entire scanning area, ensuring consistency in illumination by the first light source 40 and the second light source 50. At the same time, the distance between the first light source 40 and the lens structure 30 is ensured to be the same as the distance between the second light source 50 and the lens structure 30, so that the light reflected from the scanning area by the first light source 40 and the light reflected from the scanning area by the second light source 50 are simultaneously emitted to the lens structure 30, thereby transmitting image information to the PCB board 20 corresponding to the lens structure 30, ensuring stability in image transmission.

[0032] It should be noted that the first light source 40 and the second light source 50 are symmetrically arranged on both sides of the lens structure 30, which is convenient for adjusting the overlapping area formed by the illumination area of ​​the first light source 40 and the illumination area of ​​the second light source 50, and at the same time makes the brightness of the area outside the overlapping area more uniform, which facilitates the image sensor to detect foreign objects.

[0033] Specifically, in the direction of the line connecting the first light source 40 and the second light source 50, the length of the overlapping area is greater than or equal to 2.4 mm and less than or equal to 2.6 mm. If the length of the overlapping area is less than 2.4 mm, the length of the overlapping area is too small, which is not conducive to improving the light intensity on the scanning area and is not conducive to the detection of foreign objects. If the length of the overlapping area is greater than 2.6 mm, the length of the overlapping area is too large, which reduces the area of ​​the irradiated area and the light intensity on the scanning area, which is not conducive to the integrity of the image sensor scanning. Limiting the length of the overlapping area to the range of 2.4 mm to 2.6 mm is conducive to ensuring sufficient light intensity on the scanning area, ensuring the clarity of the image, and thus ensuring the accuracy of foreign object detection.

[0034] Specifically, the image sensor further includes a housing, within which a frame 10 and a light source structure are both located. The housing includes a scanning platform 60, which has a scanning area. The angle between the first light source 40 and the scanning platform 60 is greater than or equal to 5 degrees and less than or equal to 30 degrees; and the angle between the second light source 50 and the scanning platform 60 is greater than or equal to 5 degrees and less than or equal to 30 degrees. Both the frame 10 and the light source structure are located within the housing. This configuration allows the housing to protect the frame 10 and the light source structure, ensuring operational stability. If the angle between the first and second light sources 40, 50 and the scanning platform 60 is less than 5 degrees, the light intensity irradiated by the first and second light sources 40, 50 onto the scanned object is low, hindering foreign object detection. If the angle between the first and second light sources 40, 50 and the scanning platform 60 is greater than 30 degrees, the angle is too large, making it easy for the first and second light sources 40, 50 to block the lens structure 30, resulting in incomplete image formation by the image sensor. The angle between the first light source 40 and the second light source 50 and the scanning platform 60 is limited to the range of 5 degrees to 30 degrees. While ensuring the light intensity irradiated on the object to be scanned, the lens structure 30 will not be blocked, thereby ensuring the stability and integrity of the image sensor imaging.

[0035] Preferably, the angle between the first light source 40 and the scanning platform 60 is 14 degrees, and the angle between the second light source 50 and the scanning platform 60 is 14 degrees.

[0036] Specifically, the beam width of the first light source 40 is greater than or equal to 5 mm and less than or equal to 7 mm; the beam width of the second light source 50 is greater than or equal to 5 mm and less than or equal to 7 mm. If the beam width of the first light source 40 and the second light source 50 is less than 5 mm, the beam width of the first light source 40 and the second light source 50 is too small, which reduces the width of the light irradiated by the first light source 40 and the second light source 50 to the scanning area, easily causing loss of image information and detrimental to the integrity of the imaging. If the beam width of the first light source 40 and the second light source 50 is greater than 7 mm, the beam width of the first light source 40 and the second light source 50 is too large, which reduces the intensity of the light irradiated by the first light source 40 and the second light source 50 to the object to be scanned, which is detrimental to the detection of foreign objects. Limiting the beam width of the first light source 40 and the second light source 50 to the range of 5 mm to 7 mm ensures the clarity and integrity of the imaging of the image sensor.

[0037] Preferably, the beam width of the first light source 40 is 6 mm, and the beam width of the second light source 50 is 6 mm.

[0038] Specifically, the illumination width of the first light source 40 on the scanning platform 60 is greater than or equal to 24 mm and less than or equal to 25.5 mm; the illumination width of the second light source 50 on the scanning platform 60 is greater than or equal to 24 mm and less than or equal to 25.5 mm. If the illumination width of the first light source 40 and the second light source 50 on the scanning platform 60 is less than 24 mm, the illumination width of the first light source 40 and the second light source 50 on the scanning platform 60 is too small, which can easily cause loss of image information and affect the integrity of the imaging. If the illumination width of the first light source 40 and the second light source 50 on the scanning platform 60 is greater than 25.5 mm, the illumination width of the first light source 40 and the second light source 50 on the scanning platform 60 is too large, resulting in low light intensity on the object to be scanned, which is not conducive to the detection of foreign objects. Limiting the illumination width of the first light source 40 and the second light source 50 on the scanning platform 60 to the range of 24 mm to 25.5 mm ensures the clarity and integrity of the image sensor imaging.

[0039] Preferably, the illumination width of the first light source 40 and the second light source 50 on the scanning platform 60 is 24.7 mm.

[0040] Specifically, the distance between the first light source 40 and the scanning platform 60 is greater than or equal to 5 mm and less than or equal to 40 mm; the distance between the second light source 50 and the scanning platform 60 is greater than or equal to 5 mm and less than or equal to 40 mm. If the distance between the first light source 40 and the second light source 50 and the scanning platform 60 is less than 5 mm, the distance between the first light source 40 and the second light source 50 and the scanning platform 60 is too small, which is not conducive to placing the object to be scanned on the scanning platform 60. If the distance between the first light source 40 and the second light source 50 and the scanning platform 60 is greater than 40 mm, the distance between the first light source 40 and the second light source 50 and the scanning platform 60 is too large, resulting in insufficient illumination intensity of the object to be scanned by the first light source 40 and the second light source 50, which is not conducive to foreign object detection. Limiting the distance between the first light source 40 and the second light source 50 and the scanning platform 60 to a range of 5 mm to 40 mm facilitates placement of the object to be scanned on the scanning platform 60 while still being able to successfully detect foreign objects.

[0041] Preferably, the distance between the first light source 40 and the scanning platform 60 is 25 mm, and the distance between the second light source 50 and the scanning platform 60 is 25 mm.

[0042] like Figure 3 As shown, the detection image is shown when the distance between the first light source 40 and the second light source 50 and the scanning platform 60 is 25 mm.

[0043] like Figure 4 As shown, the detection image is shown when the distance between the first light source 40 and the second light source 50 and the scanning platform 60 is 40 mm.

[0044] Depend on Figure 3 and Figure 4 It can be seen that when the distance between the first light source 40 and the second light source 50 and the scanning platform 60 is 25 mm, the detected image is brighter and clearer.

[0045] like Figure 5 As shown, the smaller the distance between the first light source 40 and the second light source 50 and the scanning platform 60 , the higher the light intensity on the object to be scanned.

[0046] Optionally, the light source structure further includes a movable device, which is movably disposed on the frame 10. There are multiple movable devices, and the first light source 40 and the second light source 50 are respectively disposed on different movable devices, so that the first light source 40 and the second light source 50 can be independently adjusted by the movable devices. The first light source 40 and the second light source 50 are respectively disposed on different movable devices. This arrangement facilitates independent adjustment of the height and angle of the first light source 40 and the second light source 50 to ensure the illumination distance between the first light source 40 and the second light source 50 and the object to be scanned. This further enables controllable illumination intensity of the first light source 40 and the second light source 50 on the object to be scanned, thereby facilitating the detection of foreign objects.

[0047] like Figure 2 As shown, the first light source 40 and the second light source 50 are symmetrically arranged on both sides of the lens structure 30, which can ensure the intensity of light irradiated on the scanning platform 60. By moving the distance between the first light source 40 and the second light source 50 in the horizontal direction, the illumination area of ​​the first light source 40 and the illumination area of ​​the second light source 50 are at least partially overlapped, thereby improving the illumination intensity around the scanning area, thereby clearly detecting foreign objects on the object to be scanned. Figure 2 The lower middle curve represents the illumination intensity when the illumination area of ​​the first light source 40 and the illumination area of ​​the second light source 50 do not overlap. Figure 2 The curve in the middle upper part is the illumination intensity of the area illuminated by the first light source 40 and the area illuminated by the second light source 50 in the direction of the line connecting the first light source 40 and the second light source 50, and the length of the overlapping area is 2.5 mm. Figure 2 As can be clearly seen in the figure, under the same illumination width, the illumination intensity in the overlapping area of ​​2.5 mm is higher than that in the non-overlapping area. The overlapping area on the line connecting the first light source 40 and the second light source 50 effectively increases the illumination intensity around the scanning area, enabling clear detection of foreign objects on the scanned object and ensuring accurate foreign object detection. It should be noted that in this application, the illumination intensity can be increased by approximately 20%.

[0048] It should be noted that the mobile device can adjust the distance between the first light source 40 and the second light source 50, and can also adjust the angle between the first light source 40 and the scanning platform 60, adjust the angle between the second light source 50 and the scanning platform 60, adjust the distance between the first light source 40 and the scanning platform 60, and adjust the distance between the second light source 50 and the scanning platform 60.

[0049] Optionally, the image sensor further includes a plurality of photoelectric conversion chips 70, which are spaced apart on the PCB 20 along the extension direction of the PCB 20, with the scanning areas of two adjacent photoelectric conversion chips 70 at least partially overlapping. This arrangement of at least partially overlapping scanning areas of two adjacent photoelectric conversion chips 70 avoids the risk of image information loss, ensures seamless scanning by the image sensor, and guarantees imaging integrity.

[0050] Optionally, there are multiple lens structures 30, each of which corresponds to a photoelectric conversion chip 70. A first light source 40 and a second light source 50 are provided on both sides of each lens structure 30. The multiple lens structures 30 correspond to the photoelectric conversion chips 70 in a one-to-one manner. This arrangement allows each photoelectric conversion chip 70 to receive information from its corresponding lens structure 30, ensuring the independence of the image scanned by each photoelectric conversion chip 70, thereby facilitating processing of the local image.

[0051] At the same time, a first light source 40 and a second light source 50 are provided on both sides of the lens structure 30, which can ensure that the scanning area corresponding to each photoelectric conversion chip 70 has uniform high brightness, thereby ensuring that each photoelectric conversion chip 70 can clearly scan the image, and is also conducive to detecting foreign objects in the scanning area corresponding to each photoelectric conversion chip 70.

[0052] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0054] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0055] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An image sensor, characterized in that: include: Frame (10); A PCB board (20), the PCB board (20) being arranged in the frame (10); a lens structure (30), the lens structure (30) being arranged in the frame (10), the lens structure (30) being spaced apart from the PCB board (20), and the PCB board (20) being located in the extension direction of the optical axis of the lens structure (30); A light source structure, wherein the light source structure is arranged on a side of the lens structure (30) away from the PCB board (20), the light source structure comprises at least one first light source (40) and at least one second light source (50), the first light source (40) and the second light source (50) are respectively located on both sides of the lens structure (30), the scanning area of ​​the image sensor is located on the side of the light source structure away from the lens structure (30), and the irradiation area of ​​the first light source (40) to the scanning area of ​​the image sensor and the irradiation area of ​​the second light source (50) to the scanning area of ​​the image sensor at least partially overlap to form an overlapping area; The image sensor further comprises a housing, the frame (10) and the light source structure are both located within the housing, and the housing has a scanning platform (60). The light source structure further includes a moving device, which is movably arranged on the frame (10), and the moving device is multiple, and the first light source (40) and the second light source (50) are respectively arranged on different moving devices, so that the first light source (40) and the second light source (50) can be driven by the moving device to be independently adjusted, and the moving device is used to adjust the distance between the first light source (40) and the second light source (50), and the moving device is also used to adjust the angle and distance between the first light source (40), the second light source (50) and the scanning platform (60), and to adjust the light intensity of the overlapping area; In the direction of the line connecting the first light source (40) and the second light source (50), the length of the overlapping area is greater than or equal to 2.4 mm and less than or equal to 2.6 mm; The scanning platform (60) has the scanning area, and the angle between the first light source (40) and the scanning platform (60) is greater than or equal to 5 degrees and less than or equal to 30 degrees; the angle between the second light source (50) and the scanning platform (60) is greater than or equal to 5 degrees and less than or equal to 30 degrees; The distance between the first light source (40) and the scanning platform (60) is greater than or equal to 5 mm and less than or equal to 40 mm; the distance between the second light source (50) and the scanning platform (60) is greater than or equal to 5 mm and less than or equal to 40 mm.

2. The image sensor according to claim 1, wherein The first light source (40) and the second light source (50) are symmetrically arranged on both sides of the lens structure (30).

3. The image sensor according to claim 2, wherein: The beam width of the first light source (40) is greater than or equal to 5 mm and less than or equal to 7 mm; The beam width of the second light source (50) is greater than or equal to 5 mm and less than or equal to 7 mm.

4. The image sensor according to claim 1, wherein The irradiation width of the first light source (40) on the scanning platform (60) is greater than or equal to 24 mm and less than or equal to 25.5 mm; The irradiation width of the second light source (50) on the scanning platform (60) is greater than or equal to 24 millimeters and less than or equal to 25.5 millimeters.

5. The image sensor according to any one of claims 1 to 4, characterized in that The image sensor further comprises a plurality of photoelectric conversion chips (70), wherein the plurality of photoelectric conversion chips (70) are arranged on the PCB board (20) at intervals along the extension direction of the PCB board (20), and the scanning areas of two adjacent photoelectric conversion chips (70) at least partially overlap.

6. The image sensor according to claim 5, wherein: There are a plurality of lens structures (30), and the plurality of lens structures (30) are arranged in a one-to-one correspondence with the photoelectric conversion chip (70). The first light source (40) and the second light source (50) are arranged on both sides of each lens structure (30).

Images