Contact Image Sensor

Abstract

The present invention provides a contact image sensor. The contact image sensor includes: a frame, including a support frame for forming a receiving cavity; a light source assembly, at least part of which is located in the receiving cavity, and the light source assembly includes a light source for emitting a detection light beam; a diffuse light structure, which is arranged in the receiving cavity, and the diffuse light structure is located on one side of the light source, and the diffuse light structure has a diffuse reflection surface for diffuse reflection. Based on the diffuse reflection principle, at least part of the detection light beam is diffusely reflected by the diffuse reflection surface to form a scanning light beam that is incident on an object to be scanned at different incident angles; a light receiving part, including a lens located in the receiving cavity and used to converge light. Based on the reflection principle, at least part of the scanning light beam is reflected by the object to be scanned and then incident on the lens. The technical solution of the present invention solves the problem that the contact image sensor in the prior art is prone to uneven brightness of the image when scanning an object to be scanned with a bright surface and / or an uneven surface.

Description

Technical Field

[0001] The present invention relates to the technical field of image detection, and in particular to a contact image sensor. Background Art

[0002] In the field of industrial inspection, there are two main methods, one is the area array camera (CCD) plus various light sources, and the other is the contact image sensor. The contact image sensor is a linear scan, with advantages such as wide format, compact structure, space saving, 1:1 imaging, and no distortion. However, due to the structural characteristics of the contact image sensor, its application in certain specific places is limited, such as surface inspection of bright metals, glass products, and vacuum packaging bags.

[0003] In the prior art, when the contact image sensor scans a shiny and wrinkled surface such as a vacuum packaging bag, because the surface of the vacuum packaging bag has a high reflectivity, and the light emitted by the light source is emitted from a very small light-emitting area, that is, the light beam directly emitted by the light source has a strong directionality, so when the light beam emitted by the light source irradiates two different positions of the vacuum packaging bag, the wrinkles on the surface of the vacuum packaging bag will cause unevenness, so different positions may have different radii of curvature, so the light irradiated to the above two positions will be mirror-reflected in different directions, and it may happen that the mirror-reflected light at one of the two positions cannot enter the lens, and the diffusely reflected light entering the lens is very small, while the mirror-reflected light at the other of the two positions can enter the lens, and because the surface of the vacuum packaging bag is relatively smooth, most of the light will be reflected into the lens in the form of mirror reflection, so that one position will appear darker after scanning, while the other position will appear brighter, thus causing the problem of uneven brightness of the image, thereby affecting subsequent data processing. Summary of the invention

[0004] The main purpose of the present invention is to provide a contact image sensor to solve the problem that the contact image sensor in the prior art is prone to uneven brightness of the image when scanning an object with a shiny surface and / or an uneven surface.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a contact image sensor, comprising: a frame, comprising a supporting frame for forming a receiving cavity; a light source assembly, at least part of which is located in the receiving cavity, the light source assembly comprising a light source for emitting a detection light beam; a diffuse light structure, which is arranged in the receiving cavity and is located on one side of the light source, the diffuse light structure having a diffuse reflection surface for diffuse reflection, based on the diffuse reflection principle, at least part of the detection light beam is diffusely reflected by the diffuse reflection surface to form a scanning light beam that is incident on an object to be scanned at different incident angles; a light receiving part, comprising a lens located in the receiving cavity and used to converge light, based on the reflection principle, at least part of the scanning light beam is reflected by the object to be scanned and then incident on the lens.

[0006] Furthermore, the diffuse light structure is connected to the supporting frame, the diffuse reflection surface is an arc surface, and the center of the arc surface and the lens are located on both sides of the arc surface.

[0007] Furthermore, the center of the arc surface coincides with the focus of the lens.

[0008] Furthermore, the light-diffusing structure includes a diffuser plate or a diffuse reflection coating, and a surface of the light-diffusing structure facing the light source forms an arc-shaped surface.

[0009] Furthermore, the contact image sensor further comprises a supporting member for supporting the diffuse light structure, and the supporting member and the supporting frame are integrally formed or separately provided.

[0010] Furthermore, the light source assembly also includes a PCB board, at least part of which is located in the accommodating cavity, and there is an installation angle A between the PCB board and the optical axis of the lens, wherein the installation angle A satisfies: 0<A<90°; the light source is located on the side of the PCB board facing the diffuse light structure.

[0011] Furthermore, the frame also includes a mounting groove arranged on the support frame, the mounting groove is connected to the accommodating cavity, and part of the PCB board is located in the mounting groove; or, the light source includes a plurality of LED chips, and the plurality of LED chips are linearly arranged on the PCB board.

[0012] Furthermore, the light source assembly includes a PCB board arranged on the frame in a horizontal direction, the light source includes a plurality of LED chips arranged linearly on the PCB board, and an angle B is formed between a boundary light beam emitted by the light source and an optical axis of the lens, and the angle B is greater than an opening angle of the lens.

[0013] Further, the light source assembly is located on at least one side of the optical axis of the lens, and the contact image sensor includes two light diffusion structures, which are located on opposite sides of the optical axis of the lens.

[0014] Furthermore, the frame also includes a light-transmitting plate connected to the supporting frame and used for allowing the scanning light to pass through, the supporting frame and the light-transmitting plate form a accommodating cavity, and the light-transmitting plate, the light source assembly, the diffuser structure and the lens are arranged in sequence along the optical axis direction of the lens; or, the light receiving part also includes a substrate and a photosensitive element for sensing the scanning light converged by the lens, and the photosensitive element is arranged on the substrate.

[0015] By applying the technical solution of the present invention, a diffuse light structure with a diffuse reflection surface is provided on one side of the light source, so that the detection light beam with a certain directionality emitted by the light source will be reflected to various directions by the diffuse reflection surface, that is, all positions on the diffuse reflection surface irradiated by the detection light beam will undergo diffuse reflection, and each position where diffuse reflection occurs will reflect the detection light beam to various directions, so that there will always be a part of the reflected light beams that will be incident on the object to be scanned to form scanning light beams, so that the scanned part of the object to be scanned will receive incident light at various angles, that is, the scanning light beams will be incident on the object to be scanned at different incident angles, so that when the object to be scanned moves along the secondary scanning direction, even if the object to be scanned has a bright surface and / or an uneven surface, scanning light beams at different angles can be irradiated to the scanned part of the object to be scanned, and part of the scanning light beams with different incident angles will enter the lens after being diffusely reflected by the object to be scanned, thereby solving the problem of uneven brightness of the image. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram showing the structure of a contact image sensor according to the first embodiment of the present invention; and

[0018] Figure 2 The diagram shows the structure of a contact image sensor according to the second embodiment of the present invention.

[0019] The above drawings include the following reference numerals:

[0020] 1. Light source assembly; 101. PCB board; 102. Light source; 3. Frame; 301. Accommodating cavity; 3011. First hole segment; 3013. Third hole segment; 3014. Fourth hole segment; 31. Support frame; 32. Mounting slot; 4. Transparent plate; 5. Photosensitive member; 6. Substrate; 7. Lens; 8. Object to be scanned; 901. Diffuse structure; 902. Support member. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0022] It should be noted that in an embodiment of the present invention, the diffuse light structure 901 has a diffuse reflection surface that can diffusely reflect the light beam, so that the light beam can be diffusely reflected, that is, incident light with a certain angle or incident light parallel to each other can be emitted at different exit angles after diffuse reflection by the diffuse reflection surface, so as to be emitted in all directions.

[0023] It should be noted that the contact image sensor according to the embodiment of the present invention can be applied to the surface detection of objects with good reflective surfaces, such as bright metals, glass products, and vacuum packaging bags.

[0024] The inventors know of a contact image sensor, especially a large contact image sensor, which generally uses an LED array light source as the light source. As we know, there is a certain distance between LED chips. The greater the distance, the easier it is to cause the problem of uneven light source brightness, which leads to light and dark stripes in the scanned image. The brighter the surface of the object, the more obvious the light and dark stripes. Of course, the prior art generally adopts the method of adding a diffuser film between the light source and the object to be scanned to solve the above problem, but this will increase the application process, and sometimes multiple layers of diffuser film will be required to meet the requirements, which will increase the difficulty of the process, especially for extra-long contact image sensors, which are more difficult to apply. Furthermore, due to the poor light transmittance of the diffuser film, it will cause a large loss of light source brightness, which may not meet the use requirements. Therefore, an embodiment of the present invention provides a contact image sensor that can solve the above problems.

[0025] Embodiment 1

[0026] like Figure 1 As shown, the first embodiment of the present invention provides a contact image sensor. The contact image sensor includes a frame 3, a light source assembly 1 and a diffuse light structure 901. The frame 3 includes a support frame 31 for forming a housing cavity 301; at least part of the light source assembly 1 is located in the housing cavity 301, and the light source assembly 1 includes a light source 102 for emitting a detection light beam; the diffuse light structure 901 is arranged in the housing cavity 301, and the diffuse light structure 901 is located on one side of the light source 102, and the diffuse light structure 901 has a diffuse reflection surface for diffuse reflection. Based on the diffuse reflection principle, at least part of the detection light beam is diffusely reflected by the diffuse reflection surface to form a scanning light beam that is incident on the object to be scanned 8 at different incident angles; the light receiving part includes a lens 7 located in the housing cavity 301 and used to converge light. Based on the reflection principle, at least part of the scanning light beam is reflected by the object to be scanned 8 and then incident on the lens 7.

[0027] In the above technical solution, a diffuse light structure 901 with a diffuse reflection surface is provided on one side of the light source 102, so that the detection light beam with a certain directionality emitted by the light source 102 will be reflected to various directions by the diffuse reflection surface, that is, all positions on the diffuse reflection surface irradiated by the detection light beam will undergo diffuse reflection, and each position where diffuse reflection occurs will reflect the detection light beam to various directions, so that there will always be a part of the reflected light that will be incident on the object to be scanned 8 to form a scanning light beam, so that the scanned part of the object to be scanned 8 will receive incident light at various angles, that is, the scanning light beam will be incident on the object to be scanned 8 at different incident angles, so that when the object to be scanned 8 moves along the secondary scanning direction, even if the object to be scanned 8 has a bright surface and / or an uneven surface, scanning light beams of different angles can be irradiated to the scanned part of the object to be scanned 8, and part of the scanning light beams with different incident angles will enter the lens 7 after diffuse reflection by the object to be scanned 8, thereby solving the problem of uneven brightness of the image.

[0028] Furthermore, the contact image sensor of the first embodiment of the present invention can be applied to objects to be scanned with a concave-convex surface, objects to be scanned with a glossy surface, objects to be scanned with both a glossy surface and a concave-convex surface, and conventional objects to be scanned, thus increasing the applicable scope of the contact image sensor. The above-mentioned concave-convex object to be scanned generally refers to an object to be scanned with a wrinkled surface.

[0029] Specifically, in the first embodiment of the present invention, the light diffusion structure 901 is located between the lens 7 and the object to be scanned 8, so that most of the scanning light is incident on the object to be scanned 8, thereby improving the utilization rate of the scanning light.

[0030] like Figure 1 As shown, in the first embodiment of the present invention, the diffuse light structure 901 is connected to the support frame 31, the diffuse reflection surface is an arc surface, and the center of the arc surface and the lens 7 are located on both sides of the arc surface.

[0031] Through the above arrangement, the diffuse light structure 901 with an arc surface will diffusely reflect most of the detection light beam to the position where the object to be scanned 8 is located, so that the detection light beam can be prevented from being diffusely reflected and then being directed to the object to be scanned. Figure 1 The left and right directions of the scanning light beam are diverged, thereby increasing the utilization rate of the detection light beam so that more scanning light rays are incident on the object 8 to be scanned.

[0032] Of course, in alternative embodiments not shown in the drawings, the diffuse reflection surface may also be a plane, or the diffuse reflection surface may also be oriented toward the sun. Figure 1 The arc surface convex upward in the middle, that is, the center of the arc surface is located on the side where the lens is located.

[0033] like Figure 1 As shown, in the first embodiment of the present invention, the center of the arc surface coincides with the focus of the lens 7 .

[0034] In the above technical solution, the center of the arc surface coincides with the focus of the lens 7, so that a portion of the light at each position on the diffuse reflection surface will be diffusely reflected to the focal position (i.e., the center of the arc surface), that is, the focal position will receive incident light at various angles, so that the portion of the object to be scanned 8 at the focal position will receive scanning light incident at various angles, and diffusely reflect at least a portion of the scanning light into the lens 7, and as the object to be scanned 8 moves along the sub-scanning direction, each position on the object to be scanned 8 will receive scanning light incident at various angles, and each position can diffusely reflect at least a portion of the scanning light into the lens 7, so that the lens 7 can receive the light reflected from each position of the object to be scanned 8, and thus can form a clear image to solve the problem of uneven brightness of the image.

[0035] It should be noted that, in the first embodiment of the present invention, the coincidence of the center of the arc surface with the focus means that at least a part of the center of the circle overlaps with the focus.

[0036] like Figure 1 As shown, in the first embodiment of the present invention, the light diffusion structure 901 includes a diffusion plate or a diffuse reflection coating, and the surface of the light diffusion structure 901 facing the light source 102 forms an arc surface.

[0037] Through the above arrangement, the detection light beam emitted by the light source 102 can be incident on the diffuse reflection surface of the diffuse light structure 901. When the detection light beam is irradiated on the diffuse reflection surface, since the diffuse reflection coating or the diffuse light plate has excellent diffuse reflection performance, the detection light beam can be diffusely reflected in various directions, thereby forming scanning light beams that are incident on the object to be scanned 8 at various angles, and then the scanning light beams that are incident on the object to be scanned 8 will also be diffusely reflected into the lens 7. In this way, the problem of uneven brightness of the image scanned by the contact image sensor can be solved.

[0038] Preferably, in the first embodiment of the present invention, the light diffusion structure 901 is a diffuse reflection coating. The diffuse reflection coating capable of diffuse reflection can be sprayed on the side of the support frame 31 facing the light source 102, which is convenient for processing.

[0039] Preferably, in the first embodiment of the present invention, the diffuser plate is a microcellular PET reflector plate. The microcellular PET reflector plate has excellent diffuse reflection performance, so that the detection beam can be diffusely reflected to form scanning beams incident on the object 8 to be scanned at various angles.

[0040] like Figure 1 As shown, in the first embodiment of the present invention, the contact image sensor further includes a support member 902 for supporting the diffuser structure 901 , and the support member 902 is disposed separately from the support frame 31 .

[0041] Through the above-mentioned arrangement, the support member 902 can support the diffuse structure 901 so as to install the diffuse structure 901 on the support frame 31. Compared with directly processing the arc surface on the inner wall surface of the support frame 31 where the accommodating cavity 301 is provided, it is simpler to first process the support member 902 and then process the arc surface on the support member 902, and then connect the support member 902 with the diffuse structure 901 to the support frame 31.

[0042] Of course, in an alternative embodiment, the support member 902 may be integrally formed with the support frame 31 , that is, an arc-shaped structure having the same arc as that of the light-diffusing structure 901 may be processed on the support frame 31 .

[0043] Preferably, in the first embodiment of the present invention, the support member 902 is an arc-shaped structure, that is, an arc-shaped structure with an arc-shaped surface is made separately, and then the support member 902 is connected to the support frame 31 .

[0044] like Figure 1 As shown, in the first embodiment of the present invention, the light source assembly 1 further includes a PCB board 101, at least a portion of the PCB board 101 is located in the accommodating cavity, and there is a mounting angle A between the PCB board 101 and the optical axis of the lens 7, wherein the mounting angle A satisfies: 0<A<90°; the light source 102 is located on the side of the PCB board 101 facing the diffuse structure 901.

[0045] Through the above arrangement, at least a portion of the detection light beam emitted by the light source 102 can be irradiated onto the diffuse light structure 901, so that the detection light beam is diffusely reflected on the diffuse light structure 901 and forms scanning light that is emitted into the object to be scanned 8 in all directions, and then the scanning light is reflected into the lens 7. In this way, the problem of uneven brightness of the image scanned by the contact image sensor can be solved.

[0046] Specifically, in the first embodiment of the present invention, the light intensity and uniformity of the scanning light reflected by the diffuse structure 901 can be adjusted by changing the position and installation angle A of the light source 102 .

[0047] like Figure 1 As shown, in the first embodiment of the present invention, the frame 3 further includes a mounting groove 32 disposed on the support frame 31 , the mounting groove 32 is communicated with the accommodating cavity 301 , and a portion of the PCB board 101 is located in the mounting groove 32 .

[0048] In the above technical solution, by providing the mounting groove 32 , the PCB board can be better fixed on the supporting frame 31 , so that the light source 102 can be fixed more stably in the accommodating cavity 301 .

[0049] Specifically, in the first embodiment of the present invention, the mounting groove 32 has an inclined surface, the angle between the inclined surface and the optical axis of the lens 7 is the same as the mounting angle, and the PCB board 101 is connected to the inclined surface, so that the PCB board 101 can be installed on the support frame 31 at the mounting angle A.

[0050] like Figure 1 As shown, in the first embodiment of the present invention, the light source 102 includes a plurality of LED chips, and the plurality of LED chips are linearly arranged on the PCB board 101 .

[0051] Through the above arrangement, the light source 102 can emit multiple detection light beams, thereby improving the brightness of the light source 102 and increasing the light intensity of the light source 102, so that the scanned image has sufficient brightness to meet its use requirements.

[0052] Preferably, in the first embodiment of the present invention, the LED chip can emit light of any wavelength band.

[0053] Preferably, in the first embodiment of the present invention, a plurality of LED chips are linearly arranged along the length direction and / or width direction of the PCB board 101 to form an LED chip array. That is, a plurality of LED chips are linearly arranged along the length direction of the PCB board 101, which can be a single row or multiple rows.

[0054] like Figure 1 As shown, in the first embodiment of the present invention, the light source assembly 1 is located on at least one side of the optical axis of the lens 7 , and the contact image sensor includes two light diffusion structures 901 , which are located on opposite sides of the optical axis of the lens 7 .

[0055] In the above technical solution, two diffuse light structures 901 are provided, and the two diffuse light structures 901 are respectively located on opposite sides of the optical axis of the lens 7. In this way, the detection light beam diffusely reflected on the diffuse reflection surfaces of the two diffuse light structures 901 can be incident on the object to be scanned 8 from opposite sides of the lens 7, thereby forming scanning light beams that are incident on the object to be scanned 8 at different angles.

[0056] Preferably, in the first embodiment of the present invention, the number of light source assemblies 1 is two, and the two light source assemblies 1 are respectively located on opposite sides of the optical axis of the lens 7. In this way, the detection light beams are incident on the diffuse reflection surfaces of the two diffuse light structures 901, so that the scanning light beams are incident on the object to be scanned 8 from all directions, so as to solve the problem of uneven brightness of the image scanned by the contact image sensor.

[0057] like Figure 1As shown, in the first embodiment of the present invention, the frame 3 also includes a light-transmitting plate 4 connected to the supporting frame 31 and used for the scanning light to pass through. The supporting frame 31 and the light-transmitting plate 4 form a accommodating cavity 301. The light-transmitting plate 4, the light source assembly 1, the diffuser structure 901 and the lens 7 are arranged in sequence along the optical axis direction of the lens 7.

[0058] Through the above arrangement, the light-transmitting plate 4 and the supporting frame 31 enclose the accommodating cavity 301 to prevent dust or moisture from adhering to the light source 102 , thereby improving the quality of the scanned image.

[0059] Preferably, in the first embodiment of the present invention, the support frame 31 is made of materials such as plastic or metal.

[0060] Preferably, in the first embodiment of the present invention, the light-transmitting plate 4 can be made of glass or transparent plastic.

[0061] like Figure 1 As shown, in the first embodiment of the present invention, the light receiving unit further includes a substrate 6 and a photosensitive element 5 for sensing the scanning light converged by the lens 7 , and the photosensitive element 5 is disposed on the substrate 6 .

[0062] Through the above arrangement, the detection light beam converged by the lens 7 can be directly irradiated on the photosensitive element 5, thereby converting the light signal reflected by the object to be scanned 8 into an electronic signal to form a scanned image.

[0063] Specifically, in the first embodiment of the present invention, the light receiving unit includes a plurality of photosensitive elements 5, and the plurality of photosensitive elements 5 are linearly arranged on a substrate 6. The photosensitive element 5 is a photoelectric conversion chip, and the substrate 6 can be a PCB board. In this way, the light signal reflected by the object 8 to be scanned can be converted into an electronic signal, so that a scanned image can be formed.

[0064] Specifically, Figure 1 As shown, in the first embodiment of the present invention, the accommodating cavity 301 includes a first hole segment 3011, a second hole segment and a third hole segment 3013 which are connected in sequence and arranged in sequence along the vertical direction, wherein the diameters of the first hole segment 3011 and the third hole segment 3013 are both larger than the diameter of the second hole segment, the mounting groove 32 is connected to the first hole segment 3011, the diffuse structure 901 is located in the first hole segment 3011, and the lens 7 is arranged in the second hole segment, and the substrate 6 and the photosensitive element 5 are both located in the third hole segment 3013, so that the light source 102, the diffuse structure 901, the lens 7, the photosensitive element 5 and the substrate 6 can be arranged in sequence along the vertical direction.

[0065] Specifically, in the first embodiment of the present invention, the third hole segment 3013 is a stepped hole segment, so that the photosensitive element 5 and the substrate 6 can be assembled more conveniently.

[0066] Specifically, in the first embodiment of the present invention, the accommodating cavity 301 further includes a fourth hole segment 3014 located between the second hole segment and the third hole segment 3013, and the diameter of the fourth hole segment 3014 is smaller than the diameter of the second hole segment, so that a step surface can be formed between the second hole segment and the fourth hole segment 3014, and the lens 7 is disposed on the step surface. In this way, the lens 7 is easily installed.

[0067] Embodiment 2

[0068] like Figure 2 As shown, in the second embodiment of the present invention, the difference between the second embodiment of the present invention and the first embodiment is that the PCB board 101 of the light source assembly 1 is installed on the light-transmitting plate 4, and the mounting groove 32 is not provided on the support frame 31. Among them, the light source assembly 1 includes a PCB board 101 arranged on the frame 3 in a horizontal direction, the light source 102 includes a plurality of LED chips arranged linearly on the PCB board 101, and an angle B is formed between the boundary light beam emitted by the light source 102 and the optical axis of the lens 7, and the angle B is greater than the opening angle of the lens.

[0069] Through the above-mentioned setting, the utilization rate of the detection beam can be increased, so that most of the detection beam can be incident on the diffuse reflection surface of the diffuse light structure 901, and reflected onto the object to be scanned 8 through the diffuse reflection surface. In this way, the scanning light incident on the object to be scanned 8 can be increased, thereby making the scanned image clearer.

[0070] Specifically, in the second embodiment of the present invention, by adjusting Figure 2 The intensity and uniformity of the reflected light of the diffuse structure 901 are adjusted by adjusting the left and right positions of the light source 102 in the diffuse structure 901.

[0071] Preferably, in the second embodiment of the present invention, the angle B is greater than 12°. In this way, the detection light beam emitted by the light source 102 can be prevented from directly entering the lens 7, thereby avoiding affecting the effect of the scanned image.

[0072] The other structures of the contact image sensor in the second embodiment of the present invention are the same as those in the first embodiment and will not be described again.

[0073] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: a diffuse light structure with a diffuse reflection surface is arranged on one side of the light source, so that the detection light beam with a certain directionality emitted by the light source will be reflected to various directions by the diffuse reflection surface, that is, the position on the diffuse reflection surface irradiated by the detection light beam will undergo diffuse reflection, and each position where diffuse reflection occurs will reflect the detection light beam to various directions, so that there will always be a part of the reflected light that will be incident on the object to be scanned to form a scanning light beam, so that the scanned part of the object to be scanned will receive incident light at various angles, that is, the scanning light beam will be incident on the object to be scanned at different incident angles, so that when the object to be scanned moves along the secondary scanning direction, even if the object to be scanned has a bright surface and / or an uneven surface, scanning light beams of different angles can be irradiated to the scanned part of the object to be scanned, and a part of the scanning light beams with different incident angles will enter the lens after being diffusely reflected by the object to be scanned, thereby solving the problem of uneven brightness of the image.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A contact image sensor, characterized in that: include: A frame (3), comprising a support frame (31) for forming a receiving cavity (301); A light source assembly (1), at least a portion of the light source assembly (1) is located in the accommodating cavity (301), and the light source assembly (1) comprises a light source (102) for emitting a detection light beam; A diffuse light structure (901) is arranged in the accommodating cavity (301), and the diffuse light structure (901) is located on one side of the light source (102), the diffuse light structure (901) has a diffuse reflection surface for diffuse reflection, and based on the diffuse reflection principle, at least part of the detection light beam is diffusely reflected by the diffuse reflection surface to form scanning light beams that are incident on the object to be scanned (8) at different incident angles; a light receiving unit, comprising a lens (7) located in the accommodating cavity (301) and used for converging light, wherein based on the reflection principle, at least part of the scanning light is reflected by the object to be scanned (8) and then incident on the lens (7); The diffuse light structure (901) is connected to the support frame (31); the diffuse reflection surface is an arc-shaped surface; the center of the arc-shaped surface and the lens (7) are located on both sides of the arc-shaped surface; The center of the arc surface coincides with the focus of the lens (7); The light-diffusing structure (901) comprises a diffuser plate or a diffuse reflection coating, and the surface of the light-diffusing structure (901) facing the light source (102) forms the arc-shaped surface.

2. The contact image sensor according to claim 1, characterized in that: The contact image sensor further comprises a support member (902) for supporting the diffuse light structure (901); the support member (902) and the support frame (31) are integrally formed or separately provided.

3. The contact image sensor according to claim 1 or 2, characterized in that: The light source assembly (1) further comprises a PCB board (101), at least a portion of the PCB board (101) is located in the accommodating cavity (301), and a mounting angle A is provided between the PCB board (101) and the optical axis of the lens (7), wherein the mounting angle A satisfies: 0<A<90°; The light source (102) is located on a side of the PCB board (101) facing the light diffusion structure (901).

4. The contact image sensor according to claim 3, characterized in that: The frame (3) further comprises a mounting groove (32) arranged on the support frame (31), the mounting groove (32) being in communication with the accommodating cavity (301), and a portion of the PCB board (101) being located in the mounting groove (32); or the light source (102) comprises a plurality of LED chips, and the plurality of LED chips are linearly arranged on the PCB board (101).

5. The contact image sensor according to claim 1 or 2, characterized in that: The light source assembly (1) comprises a PCB board (101) arranged on the frame (3) in a horizontal direction; the light source (102) comprises a plurality of LED chips arranged linearly on the PCB board (101); an angle B is formed between a boundary light beam emitted by the light source (102) and an optical axis of the lens (7); and the angle B is greater than an opening angle of the lens.

6. The contact image sensor according to claim 1 or 2, characterized in that: The light source assembly (1) is located on at least one side of the optical axis of the lens (7), and the contact image sensor comprises two light diffusion structures (901), wherein the two light diffusion structures (901) are located on opposite sides of the optical axis of the lens (7).

7. The contact image sensor according to claim 1 or 2, characterized in that: The frame (3) further comprises a light-transmitting plate (4) connected to the supporting frame (31) and used for allowing the scanning light to pass through, the supporting frame (31) and the light-transmitting plate (4) enclose the accommodating cavity (301), and the light-transmitting plate (4), the light source assembly (1), the light-diffusing structure (901) and the lens (7) are arranged in sequence along the optical axis direction of the lens (7); or, the light-receiving portion further comprises a substrate (6) and a photosensitive element (5) used for sensing the scanning light converged by the lens (7), and the photosensitive element (5) is arranged on the substrate (6).

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