Image sensor

Abstract

The present invention provides an image sensor, which includes: a housing; a chip substrate disposed within the housing; a lens structure disposed on the housing, with the lens structure spaced apart from the chip substrate, and the chip substrate being located in the extending direction of the optical axis of the lens structure; a light source structure disposed on the housing and located on the periphery of the lens structure, the light source structure being inclined in a direction close to the lens structure, the light source structure having a light guiding member, the light guiding member having a light emitting surface, the light emitting surface being composed of a raised surface section and at least two planar sections, and there being at least one planar section on each side of the raised surface section, and the scanning object surface of the image sensor being located on the side of the lens structure away from the chip substrate. The present invention solves the problem of poor image processing effect existing in the image sensor in the prior art.

Description

Technical Field

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

[0002] With the development of technology and the continuous progress of society, the industrial intelligent development shows an explosive growth trend. In the field of machine vision, the way of simulating biological vision to image and process information helps robots extract, process and understand the extracted information, so as to make them perform automated operations accurately, efficiently and safely. The importance of machine vision is mainly reflected in: guiding and positioning, appearance detection, high-precision monitoring and image recognition. Existing image sensors have problems of insufficient light source brightness when scanning objects with a relatively dark color background or scanning objects at a very high speed, resulting in large image noise and poor image quality processing effects.

[0003] That is to say, the image sensors in the prior art have problems of poor image processing effects. Summary of the Invention

[0004] The main object of the present invention is to provide an image sensor to solve the problem of poor image processing effects existing in the image sensors in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an image sensor, including: a housing; a chip substrate disposed within the housing; a lens structure disposed on the housing, the lens structure being spaced apart from the chip substrate, and the chip substrate being located in the extending direction of the optical axis of the lens structure; a light source structure disposed on the housing and located on the periphery of the lens structure, the light source structure being inclined in a direction close to the lens structure, the light source structure having a light guiding member, the light guiding member having a light emitting surface, the light emitting surface being composed of a raised surface section and at least two flat surface sections, and there being at least one flat surface section on each side of the raised surface section, and the scanning object surface of the image sensor is located on the side of the lens structure away from the chip substrate.

[0006] Further, the light source structure is one or more. When there are multiple light source structures, the light source structures are disposed on at least two sides of the lens structure.

[0007] Further, a recessed area is provided on the side of the housing facing the scanning object surface, and the light source structure is disposed at the recessed area. The light source structure includes: a light source substrate disposed on the housing; an LED disposed on the light source substrate, and the light guiding member is disposed on the LED and on the side of the LED away from the light source substrate, and the flat surface section is parallel to the light source substrate.

[0008] Further, there are multiple LEDs, and the multiple LEDs are arranged at intervals along a straight line. The light guiding member is strip-shaped, and the extending direction of the strip-shaped light guiding member is the same as the arrangement direction of the multiple LEDs.

[0009] Further, the distances between at least two planar segments and the light source substrate are equal, so that the at least two planar segments are at the same height.

[0010] Further, the planar segments include a first planar segment, a second planar segment, a third planar segment, and a fourth planar segment. The surface of the light guide member away from the LED further includes a first transition surface segment connecting the first planar segment and the second planar segment and a second transition surface segment connecting the third planar segment and the fourth planar segment. Among them, the second planar segment and the third planar segment are connected to the raised surface segment.

[0011] Further, the distances between the first planar segment and the fourth planar segment and the light source substrate are respectively equal; and / or the distances between the second planar segment and the third planar segment and the light source substrate are respectively equal; and / or the distance between the first planar segment and the light source substrate is greater than the distance between the second planar segment and the light source substrate; and / or the width of the first planar segment is greater than the width of the second planar segment.

[0012] Further, the raised surface segment is an arc surface segment.

[0013] Further, the raised surface segment includes a combined surface segment composed of an arc surface segment and straight surface segments. Among them, there are multiple straight surface segments, and the multiple straight surface segments are symmetrically arranged on both sides of the arc surface segment respectively, and the multiple straight surface segments on the same side are arranged at an angle.

[0014] Further, the radius of curvature of the arc surface segment is greater than or equal to 4.4 mm and less than or equal to 4.6 mm.

[0015] Further, the surface of the light guide member facing the light source structure has a recessed portion, the recessed portion forms a receiving cavity, and the recessed portion has a light incident surface, and the light incident surface is an arc surface.

[0016] Further, the light guide member further includes a lateral connection surface connecting the light exit surface and the light incident surface. The lateral connection surface is composed of multiple surface segments continuously arranged along a curve direction, and an angle is provided between adjacent two surface segments, and the surface segments are planes.

[0017] Further, the image sensor further includes a chip, the chip is located on the surface of the chip substrate facing the lens structure, and the chip is correspondingly arranged with the lens structure.

[0018] Applying the technical solution of the present invention, the image sensor includes a housing, a chip substrate, a lens structure and a light source structure. The chip substrate is disposed within the housing; the lens structure is disposed on the housing, and the lens structure is spaced apart from the chip substrate, and the chip substrate is located in the extending direction of the optical axis of the lens structure; the light source structure is disposed on the housing and is located on the circumferential side of the lens structure, and the light source structure is inclined in a direction close to the lens structure. The light source structure has a light guide member, and the light guide member has a light-emitting surface, and the light-emitting surface is composed of a raised surface segment and at least two flat surface segments, and there is at least one flat surface segment on each side of the raised surface segment. The scanned object surface of the image sensor is located on the side of the lens structure away from the chip substrate.

[0019] By providing the housing, the housing provides an installation position for the chip substrate, the lens structure and the light source structure, improving the reliability of use of the chip substrate, the lens structure and the light source structure, and ensuring the stable operation of the image sensor. By providing the light source structure, the light source structure can irradiate the scanned object surface, and at the same time, the light reflected by the scanned object surface is directed to the lens structure to transmit the image information to the chip substrate corresponding to the lens structure, ensuring the stability of image transmission. The light source structure has a light guide member, so that the light guide member can converge the light-emitting angle of the light source structure, thereby achieving the effect of concentrating light and increasing brightness, thus avoiding the situation that when the image sensor scans an object with a relatively dark background color or a very fast scanning speed, the brightness of the light source structure is insufficient, resulting in large image noise and poor image processing effect. The light guide member has a light-emitting surface, and the light-emitting surface is composed of a raised surface segment and at least two flat surface segments, and there is at least one flat surface segment on each side of the raised surface segment. By reasonably planning the surface shape of the light-emitting surface, the loss of light energy when the light exits from the light-emitting surface can be effectively reduced, the utilization rate of light intensity is improved, and the efficient light-concentrating effect of the light guide member is ensured. Furthermore, the image sensor can clearly display the image, which is beneficial to the recognition of subsequent image algorithms and improves the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 shows a schematic structural diagram of the image sensor according to Embodiment 1 of the present invention;

[0022] Figure 2 shows a schematic structural diagram of the image sensor according to Embodiment 2 of the present invention;

[0023] Figure 3 shows Figure 1 a schematic structural diagram of the light guide member in

[0024] Figure 4 showsFigure 3 Schematic diagram of another angle of the light guide member in

[0025] Wherein, the above-mentioned drawings include the following reference numerals:

[0026] 10. Frame; 20. Light source substrate; 31. LED; 40. Light guide member; 41. First planar segment; 42. Second planar segment; 43. Third planar segment; 44. Fourth planar segment; 45. First transition surface segment; 46. Second transition surface segment; 47. Arc surface segment; 48. Straight surface segment; 49. Accommodation cavity; 491. Light incident surface; 400. Lateral connection surface; 401. First surface segment; 402. Second surface segment; 403. Third surface segment; 404. Fourth surface segment; 405. Fifth surface segment; 406. Sixth surface segment; 411. End face; 50. Center line; 60. Chip substrate; 70. Lens structure; 80. Scanning object surface; 90. Chip. Specific embodiments

[0027] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0028] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0029] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravitational directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components themselves, but the above orientation terms do not limit the present invention.

[0030] In order to solve the problem of poor image processing effect existing in the prior art image sensors, the present invention provides an image sensor.

[0031] Embodiment 1

[0032] As Figures 1 to 4As shown in the figure, the image sensor includes a housing 10, a chip substrate 60, a lens structure 70, and a light source structure. The chip substrate 60 is disposed within the housing 10. The lens structure 70 is disposed on the housing 10, and the lens structure 70 is spaced apart from the chip substrate 60. The chip substrate 60 is located in the extending direction of the optical axis of the lens structure 70. The light source structure is disposed on the housing 10 and on the circumferential side of the lens structure 70. The light source structure is inclined in a direction approaching the lens structure 70. The light source structure has a light guide member 40, and the light guide member 40 has a light-emitting surface. The light-emitting surface is composed of a raised surface section and at least two flat surface sections, and there is at least one flat surface section on each side of the raised surface section. The scanning object surface 80 of the image sensor is located on the side of the lens structure 70 away from the chip substrate 60.

[0033] By providing the housing 10, the housing 10 provides an installation position for the chip substrate 60, the lens structure 70, and the light source structure, improving the reliability of use of the chip substrate 60, the lens structure 70, and the light source structure, and ensuring the stable operation of the image sensor. By providing the light source structure, the light source structure can irradiate the scanning object surface 80, and at the same time, the light reflected by the scanning object surface 80 is directed to the lens structure 70 to transmit the image information to the chip substrate 60 corresponding to the lens structure 70, ensuring the stability of image transmission. The light source structure has a light guide member 40, enabling the light guide member 40 to converge the light-emitting angle of the light source structure, thereby achieving the effect of condensing light and increasing brightness, and avoiding the situation where the brightness of the light source structure is insufficient when the image sensor scans an object with a darker background color or a very fast scanning speed, resulting in large image noise and poor image processing effect. The light guide member 40 has a light-emitting surface, which is composed of a raised surface section and at least two flat surface sections, and there is at least one flat surface section on each side of the raised surface section. By reasonably planning the surface shape of the light-emitting surface, the loss of light energy when the light exits from the light-emitting surface can be effectively reduced, improving the utilization rate of light intensity and ensuring the efficient light-condensing effect of the light guide member 40. Furthermore, the image sensor can clearly display the image, which is beneficial to the subsequent recognition of image algorithms and improves the detection efficiency.

[0034] It should be noted that the present invention mainly designs an image sensor with a high-brightness light source structure. The light source structure realizes small-angle light distribution within a limited size range, making the light emitted by the light source structure more concentrated, improving the utilization rate of luminous flux, and at the same time obtaining a uniformly luminous strip-shaped light spot, which is beneficial for the image sensor to obtain a clear image when scanning an object with a darker color background or a very fast scanning speed.

[0035] Such as Figure 1As shown in the figure, the image sensor further includes a chip 90, which is located on one surface of the chip substrate 60 facing the lens structure 70. In this way, the chip substrate 60 is used to carry the chip 90 and provide a circuit for the chip 90 at the same time, realizing the transmission of signals. The chip 90 is correspondingly arranged with the lens structure 70. This arrangement enables the chip 90 to receive the image information transmitted from the lens structure 70, so that the chip 90 can accumulate charges while being sensitive to light, converting the optical signal into an electrical signal to achieve the transmission and conversion of signals and ensure the stability of image transmission.

[0036] It should be noted that there can be multiple chips 90 as described above, and the multiple chips 90 are linearly arranged on the chip substrate 60. The above-mentioned lens structure 70 is used for optical imaging. Preferably, the lens structure 70 selects a lens with a linear 1:1 equal ratio imaging.

[0037] Specifically, the image sensor further includes a housing. The frame 10 is located inside the housing, and one side of the housing has a scanning object surface 80. This arrangement enables the housing to protect the frame 10, ensuring the stability of the devices on the frame 10 and ensuring the stable operation of the image sensor.

[0038] Specifically, one side of the frame 10 facing the scanning object surface 80 has a recessed area, and the light source structure is arranged at the recessed area. This arrangement plans the structural shape of the frame 10, improves the reliability of the frame 10 in use, and at the same time enables the light source structure to be stably arranged at the recessed area, improving the assembly stability of the light source structure and the frame 10.

[0039] Specifically, the light source structure includes a light source substrate 20, an LED 31, and a light guide member 40. The light source substrate 20 is arranged on the frame 10; the LED 31 is arranged on the light source substrate 20, enabling the light source substrate 20 to provide a circuit for the LED 31 and at the same time the light source substrate 20 can also accelerate the heat dissipation of the LED 31 to form a protection for the LED 31, ensuring the stability and safety of the LED 31 during operation and ensuring that the LED 31 can emit light stably. The light guide member 40 is arranged on the LED 31 and on the side of the LED 31 away from the light source substrate 20, and the flat section is parallel to the light source substrate 20.

[0040] It should be noted that the light source substrate 20 is preferably made of an aluminum substrate, so that the light source substrate 20 can further accelerate the heat dissipation of the LED 31 and effectively protect the LED 31.

[0041] It should be noted that the light guide member 40 is a light guide lens, and the material of the light guide lens includes one of PC and PMMA. Of course, it can also be other materials that can achieve light transmission. Preferably, the light guide member 40 selects an acrylic optical material.

[0042] Specifically, there are multiple LED 31s, and the multiple LED 31s are arranged at intervals along a straight line. The light guide member 40 is strip-shaped, and the extending direction of the strip-shaped light guide member 40 is the same as the arrangement direction of the multiple LED 31s. The light guide member 40 is symmetrically arranged with respect to the optical axis of the LED 31, so that the light guide member 40 can condense the light of the multiple LED 31s, effectively shrinking the emission angle of each LED 31. As a result, the light guide member 40 can achieve the effect of condensing light and increasing brightness for each LED 31, effectively increasing the light brightness and improving the utilization rate of the luminous flux.

[0043] It should be noted that the above-mentioned multiple LED 31s are arranged linearly at equal intervals, that is, the distance between any two adjacent LED 31s among the multiple LED 31s is equal. Preferably, the LED 31 is a spherical structure with a diameter of 2.5 mm, so as to further achieve the effect of light condensation and ensure the light brightness of the LED 31.

[0044] Specifically, the distances between at least two flat segments and the light source substrate 20 are equal, so that the at least two flat segments are at the same height. That is to say, the two flat segments are in the same horizontal plane. The distance between the point on the raised surface segment farthest from the light source substrate 20 and the light source substrate 20 is greater than the distance between the at least two flat segments and the light source substrate 20, so that the raised surface segment protrudes from the flat segment.

[0045] As Figure 3 shown, there are multiple flat segments, and the multiple flat segments include a first flat segment 41, a second flat segment 42, a third flat segment 43, and a fourth flat segment 44. The surface of the light guide member 40 away from the LED 31 further includes a first transition surface segment 45 connecting the first flat segment 41 and the second flat segment 42 and a second transition surface segment 46 connecting the third flat segment 43 and the fourth flat segment 44. Among them, the second flat segment 42 and the third flat segment 43 are connected to the raised surface segment. It should be noted that the light guide member 40 has a center line 50, the light guide member 40 is symmetric along the center line 50, the center line 50 coincides with the optical axis of the LED 31, and both the first transition surface segment 45 and the second transition surface segment 46 are parallel to the center line 50.

[0046] Specifically, the distances between the first flat segment 41 and the fourth flat segment 44 and the light source substrate 20 are equal respectively; the distances between the second flat segment 42 and the third flat segment 43 and the light source substrate 20 are equal respectively; the distance between the first flat segment 41 and the light source substrate 20 is greater than the distance between the second flat segment 42 and the light source substrate 20; the widths of the first flat segment 41 and the fourth flat segment 44 are equal, the widths of the second flat segment 42 and the third flat segment 43 are equal, and the width of the first flat segment 41 is greater than the width of the second flat segment 42.

[0047] In an embodiment not shown in the figure, the raised surface segment is an arc surface segment 47. That is, the raised surface segment is a continuous arc surface segment 47, and the two sides of the raised surface segment are respectively connected to the second plane segment 42 and the third plane segment 43.

[0048] As Figure 3 shown, the raised surface segment includes a combined surface segment composed of an arc surface segment 47 and a straight surface segment 48. Among them, there are multiple straight surface segments 48, and the multiple straight surface segments 48 are symmetrically arranged on both sides of the arc surface segment 47 respectively, and the multiple straight surface segments 48 on the same side are arranged at an angle. In this application, two straight surface segments 48 are arranged at an angle on both sides of the arc surface segment 47 respectively.

[0049] Specifically, the radius of curvature of the arc surface segment 47 is greater than or equal to 4.4 millimeters and less than or equal to 4.6 millimeters. In this application, the radius of curvature of the arc surface segment 47 is 4.5 millimeters.

[0050] Specifically, the surface of the light guide 40 facing the LED 31 has a recessed portion, and the recessed portion forms a receiving cavity 49 for receiving the LED 31. Such a setting makes the receiving cavity 49 used to place the LED 31. The receiving cavity 49 provides a placement space for the LED 31, improves the use reliability of the LED 31, and at the same time, the receiving cavity 49 protects the LED 31, avoiding the situation that the light guide 40 presses the LED 31 or causes wear to the LED 31, ensuring that the LED 31 can operate stably. The recessed portion has a light incident surface 491, and the light incident surface 491 is an arc surface. The light emitted by the LED 31 enters the light guide 40 through the light incident surface 491. The specific size of the receiving cavity 49 can be designed according to the size of the LED 31. In this application, the diameter of the cross section of the receiving cavity 49 is 3 millimeters. That is to say, the diameter of the light incident surface 491 is 3 millimeters. When placing the LED 31, the center of the LED 31 should be on the center line 50 of the light guide 40. The side of the light guide 40 facing the LED 31 also includes two end faces 411. The two end faces 411 are symmetrically arranged along the center line 50 and are respectively connected to the light incident surface 491. The two end faces 411 are on the same horizontal plane and are parallel to the light source substrate 20. The end face 411 is flush with the surface of the LED 31 away from the light guide 40.

[0051] As Figure 3 and Figure 4As shown, the light guide 40 further includes a lateral connection surface 400 connecting the light exit surface and the light entrance surface 491. Specifically, the light entrance surface 491 is connected to the lateral connection surface 400 through an end surface 411. The lateral connection surface 400 is composed of a plurality of surface segments continuously arranged along a curved line direction, and an angle is provided between adjacent two surface segments, and the surface segments are flat surfaces. The lateral connection surface 400 is a total reflection surface. The light emitted by the LED 31 enters the light guide structure through the light entrance surface 491, and then the lateral connection surface 400 totally reflects the light of the LED 31, so that after total reflection, the light is emitted parallel to the center line 50.

[0052] Specifically, the lateral connection surface 400 includes a first surface segment 401, a second surface segment 402, a third surface segment 403, a fourth surface segment 404, a fifth surface segment 405, and a sixth surface segment 406 that are sequentially connected along a curve. One side of the first surface segment 401 away from the second surface segment 402 is connected to the end surface 411, and one side of the sixth surface segment 406 away from the fifth surface segment 405 is connected to the first flat surface segment 41 or the fourth flat surface segment 44. In this application, the angle between the first surface segment 401 and the center line 50 is 41.5°, the angle between the second surface segment 402 and the center line 50 is 35°, the angle between the third surface segment 403 and the center line 50 is 30.5°, the angle between the fourth surface segment 404 and the center line 50 is 27.5°, the angle between the fifth surface segment 405 and the center line 50 is 24.5°, and the angle between the sixth surface segment 406 and the center line 50 is 22°. Such a setting enables the large-angle light emitted by the LED 31 to form light parallel to the center line 50 after total reflection by the lateral connection surface 400, and then is emitted from the first flat surface segment 41 and the fourth flat surface segment 44. The small-angle light emitted by the LED 31 forms light parallel to the center line 50 through the arc surface segment 47 and then is emitted. Among the two straight surface segments 48 on one side of the arc surface segment 47, the straight surface segment 48 close to the arc surface segment 47 forms an angle of 32° with the center line 50, so that the intermediate-angle light emitted by the LED 31 forms light parallel to the center line 50 through this straight surface segment 48 and then is emitted; the straight surface segment 48 far from the arc surface segment 47 forms an angle of 13° with the center line 50, so that the intermediate-angle light emitted by the LED 31 forms total reflection light through this straight surface segment 48 and then forms light parallel to the center line 50 through the arc surface segment 47 and is emitted. In this way, at the scanned object surface 80, a high-brightness strip-shaped light spot with uniform light emission is formed, effectively reducing light decay and improving the utilization rate of luminous flux.

[0053] In this application, the width of the strip-shaped light spot is about 10 mm. For a light spot with such a width, there is a relatively large adjustable margin during the installation of the image sensor, which facilitates production and installation. The light rays of the scanned object surface 80 are reflected and enter the lens structure 70 to form a proportional image. At the same time, the optical signal is transmitted to the chip 90. The chip 90 senses light and accumulates charges, converting the optical signal into an electrical signal. The chip substrate 60 carries the chip 90 and transmits the electrical signal, and subsequent algorithms process the signal. The light emitted by the LED 31 is condensed into a parallel light beam through the light guide 40, and the light efficiency is increased by more than 4 times. In this way, when the image sensor scans a scanned object with a relatively dark background color or a very fast scanning speed, it can clearly display the image, which is beneficial to the recognition of subsequent image algorithms.

[0054] Embodiment 2

[0055] The difference from Embodiment 1 is the number of light source structures.

[0056] As Figure 2 shown, when there are multiple light source structures, light source structures are provided on at least two sides of the lens structure 70. Two light source structures are inclined and arranged on both sides of the lens structure 70. In some application scenarios with higher brightness requirements, the light source structure is not limited to one side and can also be placed on both sides according to requirements. The light source structures placed on both sides emit light simultaneously, further increasing the brightness of the scanned object surface 80. Of course, the light emitting angle of the light guide 40 can also be adjusted according to the actual situation to further adjust the light emitting irradiation area of the scanned object surface 80 to meet the actual requirements.

[0057] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0058] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, 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, operations, devices, components, and / or combinations thereof.

[0059] It should be noted that the terms "first", "second", etc. in the description, claims, and above-mentioned drawings of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order different from those illustrated or described here.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An image sensor, characterized in that, comprising: a housing (10); a chip substrate (60), the chip substrate (60) being disposed within the housing (10); a lens structure (70), the lens structure (70) being disposed on the housing (10), the lens structure (70) being spaced apart from the chip substrate (60), and the chip substrate (60) being located in the extending direction of the optical axis of the lens structure (70); a light source structure, the light source structure being disposed on the housing (10) and on the circumferential side of the lens structure (70), the light source structure being inclined in a direction approaching the lens structure (70), the light source structure having a light guide member (40), the light guide member (40) having a light emitting surface, the light emitting surface being composed of a raised surface section and at least two flat surface sections, and at least one of the flat surface sections being disposed on each side of the raised surface section, and a scanned object surface (80) of the image sensor being located on a side of the lens structure (70) away from the chip substrate (60); a recessed area is provided on a side of the housing (10) facing the scanned object surface (80), the light source structure is disposed at the recessed area, the light source structure comprising: a light source substrate (20), the light source substrate (20) being disposed on the housing (10); an LED (31), the LED (31) being disposed on the light source substrate (20), the light guide member (40) being disposed on the LED (31) and on a side of the LED (31) away from the light source substrate (20), and the flat surface section being parallel to the light source substrate (20); the raised surface section comprises a combined surface section formed by an arc surface section (47) and a straight surface section (48), wherein, there are a plurality of the straight surface sections (48), and the plurality of straight surface sections (48) are symmetrically disposed on both sides of the arc surface section (47) respectively, and an angle is formed between the plurality of straight surface sections (48) on the same side.

2. The image sensor according to claim 1, characterized in that, the light source structure is one or more, and when the light source structure is multiple, the light source structure is disposed on at least two sides of the lens structure (70).

3. The image sensor according to claim 1, characterized in that, there are a plurality of the LEDs (31), the plurality of LEDs (31) are arranged at intervals along a straight line, the light guide member (40) is strip-shaped, and the extending direction of the strip-shaped light guide member (40) is the same as the arrangement direction of the plurality of LEDs (31).

4. The image sensor according to claim 1, characterized in that, the distances between at least two of the flat surface sections and the light source substrate (20) are equal, so that at least two of the flat surface sections are at the same height.

5. The image sensor according to claim 1, characterized in that, The planar segment includes a first planar segment (41), a second planar segment (42), a third planar segment (43), and a fourth planar segment (44). A surface of the light guide member (40) away from the LED (31) further includes a first transition surface segment (45) connecting the first planar segment (41) and the second planar segment (42), and a second transition surface segment (46) connecting the third planar segment (43) and the fourth planar segment (44). Among them, the second planar segment (42) and the third planar segment (43) are connected to the raised surface segment.

6. The image sensor according to claim 5, wherein, the distances between the first planar segment (41) and the fourth planar segment (44) and the light source substrate (20) are equal respectively; and / or the distances between the second planar segment (42) and the third planar segment (43) and the light source substrate (20) are equal respectively; and / or the distance between the first planar segment (41) and the light source substrate (20) is greater than the distance between the second planar segment (42) and the light source substrate (20); and / or the width of the first planar segment (41) is greater than the width of the second planar segment (42).

7. The image sensor according to claim 1, wherein, the radius of curvature of the arc surface segment (47) is greater than or equal to 4.4 mm and less than or equal to 4.6 mm.

8. The image sensor according to any one of claims 1 to 6, wherein, a surface of the light guide member (40) facing the light source structure has a recess, the recess forms a receiving cavity (49), the recess has a light incident surface (491), and the light incident surface (491) is an arc surface.

9. The image sensor according to claim 8, wherein, the light guide member (40) further includes a lateral connection surface (400) connecting the light exit surface and the light incident surface (491). The lateral connection surface (400) is composed of a plurality of surface segments continuously arranged along a curve direction, and an angle is formed between adjacent two surface segments, and the surface segments are planar.

10. The image sensor according to any one of claims 1 to 6, wherein, the image sensor further includes a chip (90). The chip (90) is located on a surface of the chip substrate (60) facing the lens structure (70), and the chip (90) is arranged corresponding to the lens structure (70).

Images