Image sensor

Abstract

An image sensor provided by the present application comprises two columns of imaging units and a housing, each of the two columns of imaging units comprises a plurality of imaging modules arranged in an array along a first direction, the housing comprises a side wall, a top wall and a central partition plate, and the housing is used for accommodating and separating the two columns of imaging units from each other in a lightproof manner, at least one side wall comprises a fixed wall and a movable wall, the fixed wall is fixedly connected with the central partition plate, and the movable wall is detachably connected with the central partition plate; a plurality of protruding structural parts arranged in an array mode in the first direction are arranged on the side, facing the movable wall, of the central partition plate, and at least one structural part elastically abuts against the movable wall. The image sensor provided by the utility model can effectively solve the problem of non-uniform scanning image intensity of an existing two-column image sensor.

Description

Technical Field

[0001] The present application belongs to the field of optical imaging technology, and specifically provides an image sensor. Background Art

[0002] Image sensors are optical devices widely used in industry, civil and other industries. They scan images to obtain their structural and texture features. In order to achieve high-resolution full-frame scanning applications, a linear image sensor consisting of two columns of lenses and two columns of chips has been designed. The linear image sensor scans and images at the same focal position. The specific structure and imaging principle of the linear image sensor can be found in the Chinese invention patent application number 202211180946.1 filed by the applicant, entitled "An array image detection device".

[0003] In actual use, it was found that due to processing and assembly errors in the product manufacturing process, when some array image detection devices scanned the detection objects that originally had no obvious difference in light and dark, the two columns of images obtained had obvious difference in light and dark. The above-mentioned uneven brightness problem will seriously affect the accuracy of subsequent image recognition and detection.

[0004] Therefore, there is an urgent need to solve the problem of uneven brightness of the scanned image. Utility Model Content

[0005] The purpose of the present application is to provide an image sensor to solve the problem of uneven brightness of scanned images existing in the above-mentioned existing image sensors.

[0006] Specifically, the image sensor includes two columns of imaging units and a housing, wherein the two columns of imaging units each include a plurality of imaging modules arranged in an array along a first direction, and the housing includes a side wall, a top wall and a central partition, which are used to accommodate and separate the two columns of imaging units from each other in a light-proof manner;

[0007] At least one side wall comprises a fixed wall and a movable wall, wherein the fixed wall is fixedly connected to the central partition, and the movable wall is detachably connected to the central partition;

[0008] A plurality of protruding structural members arranged in an array along a first direction are arranged on one side of the central partition facing the movable wall, and at least one of the structural members is elastically abutted against the movable wall.

[0009] Preferably, the spacing between the structural members arranged along the first direction is equal to the spacing between the imaging modules located on the same side of the central partition along the first direction, and the light propagation area of ​​the imaging module is formed between two adjacent structural members.

[0010] Preferably, when the movable wall is mounted on the housing, the movable wall is in light-tight contact with the fixed wall.

[0011] Preferably, the density of the central partition is not greater than the density of the movable wall, and / or the thickness of the central partition is not greater than the thickness of the movable wall.

[0012] Optionally, at least two first through holes are provided on the movable wall, and screw holes matching with the first through holes are provided on the central partition plate.

[0013] Preferably, there are two fixed walls and two movable walls, which are respectively arranged on two sides of the central partition plate in opposite directions.

[0014] Preferably, the movable wall and the structural member elastically abutting against the movable wall are provided with guiding structures that cooperate with each other.

[0015] Preferably, a gasket structure is provided on the periphery of the first through hole of at least one movable wall away from the central partition.

[0016] Preferably, no gasket structure is disposed around the periphery of the first through hole of at least one movable wall.

[0017] Preferably, at least one of the structural members is provided with a countersunk hole, and the movable wall is provided with a second through hole matching with the countersunk hole.

[0018] Preferably, the movable wall comprises a plurality of sub-movable walls which are sequentially spliced ​​in a light-proof manner along the first direction.

[0019] Preferably, each sub-movable wall is elastically abutted against at least one structural member, and at least one sub-movable wall is provided with two second through holes cooperating with the countersunk holes.

[0020] Optionally, the structural member elastically abutting against the sub-active wall and the structural member provided with the countersunk hole are arranged alternately.

[0021] Preferably, adjacent sub-active walls are connected to each other through folded line edges;

[0022] Preferably, at least one sub-active wall is provided with two second through holes cooperating with the countersunk holes, and the two countersunk holes cooperating with the second through holes are provided on different structural members.

[0023] Optionally, the countersunk hole is provided on a structural member elastically abutting against the sub-movable wall, and adjacent sub-movable walls are spliced ​​with each other through linear edges.

[0024] Preferably, the image sensor further comprises a linear light source module with an adjustable maximum light intensity position.

[0025] An image sensor provided in an embodiment of the present application optimizes and adjusts the frame structure of existing products. By adding a movable wall structure that elastically abuts against the central partition, the amount of light entering the imaging module can be effectively and accurately corrected, thereby effectively solving the problem of uneven brightness of the scanned image caused by assembly errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a side cross-sectional view of a conventional image sensor;

[0027] Figure 2 A schematic diagram of a designed optical path of an existing image sensor;

[0028] Figure 3 A schematic diagram of an image scanned by an existing image sensor;

[0029] Figure 4a is a schematic diagram of an actual optical path of an existing image sensor;

[0030] Figure 4b for Figure 4a An enlarged schematic diagram of the middle circle E;

[0031] Figure 5 A perspective exploded view of a housing provided according to some embodiments of the present application;

[0032] Figure 6 A cross-sectional view of a housing in an assembled state provided according to some embodiments of the present application;

[0033] Figure 7 A cross-sectional view of a housing with a guide structure provided according to some embodiments of the present application;

[0034] Figure 8 A perspective exploded view of a housing with two movable walls provided according to some embodiments of the present application;

[0035] Fig. 9 A cross-sectional view of a housing in an assembled state provided according to some embodiments of the present application;

[0036] Fig.10 A cross-sectional view of a housing in an assembled state provided according to some embodiments of the present application;

[0037] Fig.11 A perspective exploded view of a housing with a plurality of sub-movable walls provided according to some embodiments of the present application;

[0038] Fig.12 A perspective exploded view of a housing with a plurality of sub-movable walls provided according to some embodiments of the present application;

[0039] Fig.13 A schematic diagram of an image obtained by scanning using an image sensor provided by some embodiments of the present application;

[0040] Fig.14 A side view of an image sensor with a linear light source module having an adjustable maximum light intensity position provided according to some embodiments of the present application;

[0041] Fig.15 A schematic diagram of the three-dimensional structure of a linear light source module with adjustable maximum light intensity position provided according to some embodiments of the present application;

[0042] Fig.16 A side view of a linear light source module with adjustable maximum light intensity position provided according to some embodiments of the present application;

[0043] Fig.17 A schematic diagram of the change in the maximum light intensity position of a linear light source module with adjustable maximum light intensity position provided according to some embodiments of the present application.

[0044] Numbers in the figure

[0045] 1: Object plane, 21: Lens, 211: Photoelectric conversion chip, 22: Lens, 221: Photoelectric conversion chip, 23: Chip substrate, 24: Designed midline, 24': Actual midline, 3': Frame structure, 3: Shell, 31': Side wall, 31: Side wall, 311: Fixed wall, 32': Side wall, 32: Side wall, 321: Fixed wall, 33': Central partition, 33: Central partition, 34': Top wall, 34: Top wall, 341': Light hole, 341: Light hole, 342': Light hole, 342: Light hole, 41: Movable wall, 411: Movable sub-wall, 412: Movable sub-wall, 413: Movable sub-wall, 414: Movable sub-wall, 4 2: first through hole, 43: structural member, 44: screw hole, 45: spring, 46: guide column, 47: bushing, 48: second through hole, 49: countersunk hole, 51: movable wall, 52: first through hole, 53: structural member, 54: screw hole, 55: spring, 6: bolt, 7: washer, 8: linear light source module, 81: linear light source unit, 811: linear light source module, 8111: light emitting surface, 812: support member, 813: rotating shaft, 814: guide rod, 815: guide groove, 82: linear light source unit, 821: linear light source module, 8211: light emitting surface, 822: support member, 823: rotating shaft, 824: guide rod, 825: guide groove. DETAILED DESCRIPTION

[0046] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0047] For ease of understanding, various components on the drawings are enlarged or reduced, but this practice is not intended to limit the scope of protection of this application. It should be noted that in the description of the embodiments of this application, if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the products of the embodiments of this application are usually placed when used, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0048] In addition, in the description of this application, in order to distinguish different units, the words "first", "second", etc. are used in this specification, but these are not limited to the order of manufacture, and cannot be understood as indicating or implying relative importance. Their names may be different in the detailed description and claims of this application. Words in the singular form also include the plural meaning, and vice versa.

[0049] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0050] Figure 1 A side cross-sectional view of an existing image sensor is shown, and its cross-sectional plane (YZ plane) is perpendicular to the scanning direction. The core component of the image sensor is two rows of imaging modules arranged at intervals along the secondary scanning direction (Y-axis direction), each row of imaging modules includes a plurality of lenses (lenses 21 and lenses 22 in the figure) arranged in an array along the scanning direction, and a photoelectric conversion chip (photoelectric conversion chip 211 and photoelectric conversion chip 221 in the figure) arranged on the imaging optical path of each lens, and lenses 21 and 22 can use convex lenses with a certain magnification to realize the amplification of the image on the object plane 1, and then magnify the image on the corresponding photoelectric conversion chips 211 and 221, and the photoelectric conversion chips 211 and 221 convert it into an analog electrical signal reflecting the light and dark information of the image on the object plane 1 for output, and the above analog electrical signal can be further converted to digital through analog-to-digital conversion, image splicing and other steps, and finally form a digital scanned image. In addition, in order to ensure that the two columns of magnifying imaging lenses can perform seamless scanning in the scanning direction, the lenses 21 of one column of imaging modules and the lenses 22 of the other column of imaging modules are generally arranged alternately.

[0051] The imaging module can be assembled in the frame structure 3' to integrate the product. The frame structure 3' can be made of opaque hard materials, such as black PC (polycarbonate). Figure 1 As shown, it mainly includes side walls 31', 32', a central partition 33' and a top wall 34', wherein the top wall 34' is located between the lenses 21, 22 and the object plane 1, and is provided with light holes 341' and light holes 342' corresponding to the lenses 21 and 22 for light entry, and the side walls include side walls 31', 32' located on both sides of the imaging module and side walls located at the head and tail ends of the two imaging modules (not shown in the figure) to achieve closed encirclement of the two imaging modules on their outsides, and the central partition 33' is arranged in the middle of the two columns of imaging modules. Through the above structure, each lens and its corresponding photoelectric conversion chip can form their own independent imaging space.

[0052] Generally, each row of photoelectric conversion chips 211 and 221 is mounted on a chip substrate 23, and the chip substrate 23 is fixedly connected to the side walls 31' and 32' to prevent ambient light from entering the imaging space from the bottom. In addition, a bottom plate structure can be added under the chip substrate 23 to achieve a better sealing effect.

[0053] The above-mentioned image sensors can be used alone or further combined. For example, multiple image sensors can be connected end to end in sequence to achieve an extension of the scanning length. At this time, except for the image sensors at both ends, the side walls of the other image sensors at the head and tail positions can be removed and then connected to each other.

[0054] Figure 2 The optical path diagram of the existing image sensor is shown. As shown in the figure, the image information at the focal position of the two rows of lenses 21 and 22 on the scanning object plane 1 is refracted by the two rows of lenses 21 and 22 and irradiated onto the two rows of photoelectric conversion chips 211 and 221 respectively. In theory, since this structure is symmetrical, the brightness of the image obtained by imaging the two rows of imaging modules in the area with the same brightness on the object plane should also be uniform. However, Figure 3 It can be seen from the actual scanned image that the image with uniform brightness and darkness on the object surface has obvious brightness difference (i.e., grayscale value jump) after scanning and imaging.

[0055] There are many reasons for the above problems. For example, during the product manufacturing and assembly process, there is a certain installation error between the actual installation position of the two rows of photoelectric conversion chips and the designed installation position, resulting in one or two rows of photoelectric conversion chips not being in the ideal optical path of the lens, thereby causing the photoelectric conversion chips to receive light unevenly. For example, component processing errors or assembly errors will cause the assembly position of the lens or frame structure to deviate from the design plan, which will also cause the two rows of photoelectric conversion chips to receive light unevenly. Figure 4a and Figure 4b For example, when there is a deviation ΔD in the assembly accuracy, the focal position will be moved from the designed center position (i.e., the intersection of the designed perpendicular bisector 24 and the object plane 1 in the figure) to the actual center position (i.e., the intersection of the actual perpendicular bisector 24' and the object plane 1 in the figure), that is, offset from the designed center position by ΔD. Correspondingly, the focal positions of the two columns of imaging modules will also be offset by ΔD relative to the center position of the frame structure 3'. In this case, when the light emitted by the image here on the object plane 1 propagates along the two columns of lenses 21 and 22, it is asymmetrically absorbed and reflected by the side walls 31', 32' and the central partition 33' on both sides, resulting in a difference in the amount of light received by the photoelectric conversion chips 211 and 221, that is, the image at the same position on the object plane 1 is output by the photoelectric conversion chips 211 and 221 with analog electrical signals of different intensities, so that the final scanned image presents uneven brightness.

[0056] To this end, the present application provides a new type of image sensor, which improves the problem of uneven brightness of scanned images in existing products by optimizing the frame structure.

[0057] In an embodiment of the present application, the image sensor includes two columns of imaging units and a shell, wherein the two columns of imaging units each include a plurality of imaging modules arranged in an array along a first direction (as mentioned above, the first direction is also referred to as a scanning direction in the field of linear image scanning technology), and each imaging module further includes a one-to-one corresponding lens and a photoelectric conversion chip. The arrangement of the above two columns of imaging modules is the same as that of existing image sensors and will not be repeated here.

[0058] Figure 5 is an exploded view of a housing 3 of an image sensor provided according to some embodiments of the present application, Figure 6 It is a cross-sectional view of the housing 3 in the assembled state (the section line is Figure 5 AA line), such as Figure 5 , Figure 6As shown, the housing 3 of the image sensor includes a top wall 34, a central partition 33, and side walls 31 and 32 to accommodate and separate the two columns of imaging units from each other in a light-tight manner, wherein a plurality of light holes 341 and light holes 342 are provided on the top wall 34 to provide light propagation paths for each lens 21, 22, and the top wall 34, the central partition 33 and the side walls 32 are fixedly connected, and their relative positions and fixing methods can be referred to. Figure 1 The frame structure 3 ′ of the image sensor is shown.

[0059] Figure 5 In the illustrated embodiment, the side wall 32 and the side wall 31 are staggered in a first direction (X-axis direction in the figure), and the distance of the staggered arrangement is the spacing of the imaging modules. Correspondingly, both ends of the top wall 34 and the central partition plate 33 are also constructed as L-shaped step structures. With this structure, when a plurality of image sensors are spliced ​​in sequence along the first direction, it can be ensured that the spacing of the imaging modules at the splicing point of the two image sensors is consistent with the spacing of the imaging modules inside each image sensor.

[0060] In addition, when the image sensor belonging to the shell 3 is used alone, two side walls (not shown in the figure) are also provided at both ends of the shell 3 along the first direction, thereby forming a light-proof surround for the imaging module array; when multiple image sensors are spliced ​​to achieve a longer length of scanning, as described above, it is also necessary to add side wall structures at the head and tail ends respectively.

[0061] In addition to the above structure which is the same or similar to the existing image sensor frame structure, Figure 5 The housing 3 shown is relative to Figure 1 The difference in the frame structure 3' is:

[0062] 1) The side wall 31 in the shell 3 is composed of two parts, one part is a fixed wall 311 at the bottom, and the other part is a movable wall 41 located above the fixed wall, wherein the fixed wall 311 is fixedly connected to the central partition 33, and the movable wall 41 is detachably connected to the central partition 33.

[0063] exist Figure 5 , Figure 6In the illustrated embodiment, the fixed wall 311 is a portion of the side wall 31 that is fixedly connected to the shell 3. Its manufacturing method is similar to that of the side wall 32, and it can be manufactured in the same or similar manufacturing method as the frame structure of the existing image sensor, for example, it can be integrally formed with the side wall 32 and the central partition 33; the movable wall 41 can be separately manufactured by molding, CNC cutting, 3D printing, etc., and installed on the shell 3 by various methods known to those skilled in the art. When the movable wall 41 is installed on the shell 3, the movable wall 41 and the fixed wall 311 are combined to present a shape that is mirror-symmetrical to the side wall 32 as a whole. Obviously, at this time, the movable wall 41 and the fixed wall 311 need to maintain light-tight contact.

[0064] 2) A plurality of raised structural members 43 arranged in an array along a first direction (i.e., the X-axis direction in the figure) are provided on one side of the central partition plate 33 facing the movable wall 41, and at least one structural member 43 is elastically abutted against the movable wall 41 via a spring 45 or an elastic member having similar compression-rebound characteristics.

[0065] Specifically, Figure 5 and Figure 6 As shown, each structural member 43 is roughly in the shape of a cuboid, and has the same protruding height relative to the central partition 33 (this height can be sufficient to allow the movable wall 41 to be installed on the shell 3, and there is no elastic member for elastically abutting between the movable wall 41 and all the structural members 43, and there is no force between each structural member 43 and the movable wall 41 that is sufficient to cause elastic deformation of the central partition 33 or the movable wall 41), and can be fixed on the central partition 33 by bonding or the like. In addition, other alternative methods can also be used for fixing, such as directly forming the central partition 33 and each structural member 43 as an integral unit.

[0066] Furthermore, the spacing of the structural members 43 arranged along the first direction is equal to the spacing of the imaging modules located on the same side of the central partition 33 (i.e., the imaging modules corresponding to the multiple light holes 341 in the figure) arranged along the first direction, so as to ensure that there is sufficient space between two adjacent structural members 43, thereby forming a light propagation area for each imaging module.

[0067] exist Figure 5In the illustrated embodiment, there are two structural members 43 elastically abutting against the movable wall 41. The two structural members 43 are roughly located at the head and tail sides of the central partition 33 along the first direction, and a spring 45 is arranged between the two structural members 43 and the movable wall 41. When the movable wall 41 is installed on the shell 3, the two springs 45 are compressed, so that they exert pressure on the central partition 33 and the movable wall 41 at the same time. The central partition 33 and the movable wall 41 are slightly deformed under the action of the above pressure, so that the distance between the two becomes larger, thereby changing the amount of light received by each imaging module on the two columns of imaging units, thereby realizing the adjustment of the brightness of the left and right columns of images.

[0068] In some other embodiments, the number of structural members 43 elastically abutting against the movable wall 41 may also be changed. For example, the squeezing of the central partition 33 and the movable wall 41 may be achieved by only one spring 45 in the middle position of the central partition 33; or, the number of springs 45 may be increased to achieve a more precise adjustment of the amount of light entering the imaging module at different positions.

[0069] In some preferred embodiments, Figure 5 , Figure 6 As shown, a groove body for accommodating a spring 45 is provided on the structural member 43 elastically abutting against the movable wall 41. During the installation process of the movable wall 41, one end of the spring 45 is inserted into the groove body, which is convenient for assembly and can ensure good control of the pressure applied by the spring 45. In addition, the groove body can also be set at a position on the movable wall 41 that elastically abuts against the structural member 43, or corresponding groove bodies can also be provided on the structural member 43 and the movable wall 41 at the same time.

[0070] Obviously, the amount of deformation of the central partition 33 and the movable wall 41 when subjected to elastic force determines the change in the amount of light entering. Therefore, the deformation of the central partition 33 and the movable wall 41 can be controlled by adjusting multiple parameters. For example, different materials can be selected to manufacture the central partition 33 and the movable wall 41. Preferably, the central partition 33 can be made of a material with a lower density, and the movable wall 41 can be made of a material with a higher density, or the thickness of the central partition 33 can be set to be less than or equal to the thickness of the movable wall 41, or the above settings can be used at the same time. Due to the difference in density and / or thickness of the two materials, the deformation of the central partition 33 when subjected to pressure can be greater than the deformation of the movable wall 41, which can not only achieve good adjustment of the amount of light entering, but also avoid excessive deformation of the movable wall 41, resulting in light leakage between it and the fixed wall 311.

[0071] There are many options for installing the movable wall 41 to the housing 3. For example, in some optional embodiments, a plug-in structure or a buckle that cooperates with each other can be used to achieve installation and removal of the movable wall and the housing by plugging / pulling or snapping / popping. For example, in other preferred embodiments, Figure 5 , Figure 6 As shown, a first through hole 42 can be set at each end of the movable wall 41, and screw holes 44 matching the two first through holes 42 are drilled on the structural members 43 at the head and tail ends of the central partition 33 respectively. When the movable wall 41 is installed, the bolts 6 are passed through the first through holes 42 and gradually tightened in the screw holes 44 to fix the movable wall 41 to the central partition 33. Obviously, the number of the first through holes 42 and the screw holes 44 at each end can be determined according to the size of the movable wall 41 to ensure that the movable wall 41 can achieve good contact with the central partition 33 when installed on the shell 3.

[0072] Compared with the plug-in structure or the snap-on structure, the advantage of using the above-mentioned installation structure in the form of the first through hole 42 and the screw hole 44 that cooperate with each other is obvious: during the installation process of the movable wall 41 or after the installation is completed, the distance that the bolt 6 enters the screw hole 44 can be fine-tuned to accurately control the change in the distance between the two ends of the movable wall 41 and the central partition 33, thereby being able to more finely adjust the amount of light entering.

[0073] In some preferred embodiments, a guiding structure that cooperates with each other can be provided on the structural member 43 and the movable wall 41. The guiding structure can provide good positioning when the movable wall 41 is installed on the housing 3, so as to facilitate the alignment of the two. Figure 7 In the illustrated embodiment, a guide column 46 protruding from the surface is provided on the structural member 43, and a bushing 47 is provided at a corresponding position of the movable wall 41 to accommodate the guide column 46; or conversely, a protruding guide column can be provided on the movable wall 41 and a bushing structure can be provided on the structural member 43.

[0074] Figure 8 The embodiment shown shows another preferred structure of the housing 3. Fig. 9 and Fig.10 shows a cross-sectional view of the housing 3 in an assembled state, with the section lines being Figure 8BB line and CC line in. As shown in the figure, in this embodiment, the two side walls 31 and 32 of the housing 3 are in the form of fixed wall plus movable wall, that is, the side wall 31 includes a fixed wall 311 and a movable wall 41, and the side wall 32 includes a fixed wall 321 and a movable wall 51, and the fixed wall 311 and the fixed wall 321, as well as the movable wall 41 and the movable wall 51 are respectively arranged on both sides of the central partition 33 opposite to each other. Similarly, both sides of the central partition 33 are provided with structural members, that is, the structural member 43 facing the movable wall 41 side and the structural member 53 facing the movable wall 51 side, and the elastic abutment with the movable walls on both sides is achieved by elastic members such as springs 45 and 55. By setting the side walls on both sides of the imaging module display as elastically adjustable structures, the distance between the central partition and the side walls on both sides can be adjusted at the same time, so as to adjust the light intake of the two columns of imaging modules more accurately. It should be noted that since the two columns of imaging modules are arranged in a staggered manner, the structural members and light propagation areas on both sides are also arranged in a staggered manner accordingly.

[0075] Figure 8 In the housing 3 shown, the movable wall 51 and its corresponding structural member 53 can also be assembled using the corresponding first through holes 52 and screw holes 54 .

[0076] As mentioned above, by tightening the bolts, the deformation degree of the two ends of the movable wall can be adjusted more accurately. In addition, in some preferred embodiments, a gasket structure can be arranged on the periphery of the first through hole of the movable wall away from the central partition. Figure 8 In the illustrated embodiment, a gasket 7 is disposed around the periphery of the first through hole 42 at one end of the movable wall 41 , while no gasket 7 is disposed around the first through hole 42 at the other end.

[0077] The washer 7 can be made of a material with a greater hardness than the movable wall 41, such as iron, stainless steel or other metals, and is sleeved outside the first through hole 42. During the process of tightening the bolt 6, the washer 7 is subjected to pressure, which can cause a larger area around the first through hole 42 on the movable wall 41 to undergo a slight deformation. Accordingly, at the end where the washer 7 is not sleeved, the deformation range caused by the tightening of the bolt 6 is smaller than that at the end where the washer 7 is installed, but the degree of deformation is greater than that at the end where the washer 7 is installed. Obviously, at Figure 8 In the illustrated embodiment, the purpose of providing the gasket 7 is not to make the movable wall 41 fit evenly with the shell 3, but to asymmetrically provide the gasket 7 so that different positions of the movable wall 41 produce different degrees of deformation to correct the deviation of the light intake of different imaging modules.

[0078] Similarly, when the number of first through holes 42 and 52 increases, the deformation range and deformation amount at different positions on the movable wall 41 can be flexibly adjusted by setting a gasket 7 on the periphery of at least one first through hole 42 or the first through hole 52 while ensuring that a gasket 7 is not set on the periphery of at least one first through hole 42 or the second through hole 52.

[0079] Fig.11 Another preferred embodiment is shown, in which the movable wall 41 is formed by a plurality of sub-movable walls sequentially spliced ​​in a light-proof manner along a first direction.

[0080] The shape of the sub-movable wall can be flexibly set according to the needs of product assembly and light intake adjustment, for example, Fig.11 In the illustrated embodiment, the sub-movable walls 411 at both ends are roughly "L"-shaped, with the first through hole 42 disposed thereon, and the middle sub-movable walls 412 are roughly "Z"-shaped, with the sub-movable walls 411, 412 connected to each other via fold line edges.

[0081] Furthermore, if Fig.11 As shown, each sub-active wall is elastically abutted against a structural member 43 in its central area. Accordingly, in order to ensure the application of elastic force, in addition to the sub-active walls 411 at both ends, each sub-active wall 412 located in the middle area has at least two second through holes 48. These two second through holes 48 are sequentially arranged at the head and tail ends of the "Z"-shaped structure. Obviously, the connecting line forms a non-zero angle with the first direction. In this way, the stability of the "L"-shaped and "Z"-shaped sub-active walls during installation can be ensured.

[0082] Correspondingly, for a structural member 43 elastically abutting against a sub-movable wall through a spring 45, two upper and lower countersunk holes 49 cooperating with the second through hole 48 are provided on the structural members 43 on both sides thereof. During installation, the bolt 6 is passed through the second through hole 48 and tightened in the countersunk hole 49, so that the elastic pressure between each sub-movable wall and the central partition 33 can be adjusted. Obviously, due to the "Z"-shaped structure of the sub-movable wall 412, the two countersunk holes 49 on the same structural member 43 are respectively matched with the second through holes 48 of different sub-movable walls 412. By using this "Z"-shaped splicing structure, the light intake of two adjacent imaging modules can be controlled simultaneously by adjusting the tightness of a sub-movable wall 412.

[0083] Fig.12 The embodiment shows another form of sub-movable walls and their matching structural parts. In this embodiment, each sub-movable wall is a rectangular structure, and adjacent sub-movable walls are spliced ​​with each other through linear edges.

[0084] Correspondingly, except for the sub-movable walls 413 located at the head and tail ends, each sub-movable wall 414 located in the middle area is provided with two upper and lower second through holes 48, and two corresponding upper and lower countersunk holes 49 are provided on each structural member 43. When installing the sub-movable walls 413 and 414, each sub-movable wall is elastically abutted against a structural member 43 through a spring 45, and is tightened above and below the spring 45 through bolts 6. By utilizing this sub-movable wall structure, each sub-movable wall can be used to adjust the amount of light entering each imaging module one by one, so as to achieve a more precise adjustment effect.

[0085] Fig.13 2 shows an image obtained by scanning using the image sensor provided by the embodiment of the present application, such as Fig.13 As shown, by optimizing the housing structure of the image sensor, the amount of light entering each imaging module can be effectively adjusted, thereby improving the uneven brightness phenomenon of the existing image sensor caused by assembly errors.

[0086] exist Figure 1 It is also found during the use of the image sensor shown that in some cases the assembly error will cause an overall offset of the two columns of imaging modules. In this case, the brightness non-uniformity caused by the overall assembly error can be corrected by adjusting the maximum light intensity position on the object plane 1.

[0087] Fig.14 FIG. 1 shows a schematic diagram of assembling an image sensor according to some preferred embodiments of the present application. Fig.14 As shown, a linear light source module 8 with an adjustable maximum light intensity position is provided between the housing 3 of the image sensor and the object plane 1. By adjusting the maximum light intensity position on the object plane, the brightness non-uniformity caused by the overall offset of the two columns of imaging modules can be effectively corrected.

[0088] Fig.15 , Fig.16 The three-dimensional structure of the linear light source module 8 and the schematic diagram of the principle of maximum light intensity adjustment are respectively shown. As shown in the figure, the linear light source module includes a linear light source unit 81 and a linear light source unit 82. Both linear light source units extend along the first direction to provide linear illumination along the X-axis direction for the image sensor.

[0089] Furthermore, the linear light source unit 81 includes a linear light source module 811 and two groups of support members 812, a rotating shaft 813 and a guide rod 814, wherein the two support members 812 are located at both ends of the linear light source 811, one end of the rotating shaft 813 is fixedly connected to the linear light source 811, and the other end is rotatably connected to the support member 812, thereby realizing the rotation of the linear light source module relative to the support member 812, so that its light emitting surface 8111 faces a suitable position on the object plane 1.

[0090] The support member 812 is roughly semicircular with a certain thickness, and is provided with a guide groove 815 coaxial with the axis 816 of the rotating shaft 813. Correspondingly, the guide rod 814 has a cylindrical structure, one end of which is fixedly connected to the linear light source module, and the other end passes through the guide groove 815, which can provide stable guidance for the rotation of the linear light source module 811 relative to the support member 812.

[0091] The linear light source module 811 can be driven to rotate by a driving device such as a stepping motor. In addition, in some preferred embodiments, a guide rod 14 can be provided to protrude from the end surface of the support member 812 away from the linear light source module 811, and its diameter can be slightly larger than the groove width of the guide groove 815. Through the above arrangement, the rotation angle of the linear light source module 811 can be manually adjusted and can be stably maintained in the adjusted position.

[0092] Correspondingly, the linear light source unit 82 has a structure similar to that of the linear light source unit 81. The structure and working method of the linear light source module 821 and its light emitting surface 8211, support member 822, rotating shaft 823, guide rod 824 and guide groove 825 can all be referred to the linear light source unit 81 and will not be repeated here.

[0093] The support members 812 and 822 at both ends can be fixedly connected by bonding, snapping or molding, and further fixed in relative position with the shell 3 by a connection structure known to those skilled in the art. After completing the above-mentioned fixation, the angles θ1 and θ2 of the linear light source module 811 and the linear light source module 821 relative to the Y-axis are adjusted respectively, so as to change the distances P1 and P2 of the maximum light intensity on the object plane 1 relative to the two rotating axes.

[0094] Fig.17 The maximum light intensity position on the object plane 1 is shown before and after the light source is adjusted using the linear light source module 8 with adjustable maximum light intensity position. Fig.17 It can be seen that the use of the linear light source module 8 can effectively adjust the overall light intensity of the scanning area on the object plane 1, and can effectively correct the brightness unevenness caused by the overall assembly deviation of the two columns of imaging modules.

[0095] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications may be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An image sensor, comprising two rows of imaging units and a housing, wherein the two rows of imaging units each comprise a plurality of imaging modules arranged in an array along a first direction, the housing comprising side walls, a top wall and a central partition, for accommodating and separating the two rows of imaging units from each other in a light-proof manner, characterized in that: At least one side wall comprises a fixed wall and a movable wall, wherein the fixed wall is fixedly connected to the central partition, and the movable wall is detachably connected to the central partition; A plurality of protruding structural members arranged in an array along a first direction are arranged on one side of the central partition facing the movable wall, and at least one of the structural members is elastically abutted against the movable wall.

2. The image sensor according to claim 1, characterized in that: The spacing between the structural members arranged along the first direction is equal to the spacing between the imaging modules located on the same side of the central partition along the first direction, and, The light propagation area of ​​the imaging module is formed between two adjacent structural members.

3. The image sensor according to claim 1, wherein: When the movable wall is installed on the housing, the movable wall is in light-tight contact with the fixed wall.

4. The image sensor according to claim 1, wherein: The density of the central partition is not greater than the density of the movable wall, and / or the thickness of the central partition is not greater than the thickness of the movable wall.

5. The image sensor according to claim 1, wherein: At least two first through holes are arranged on the movable wall, and screw holes matching with the first through holes are arranged on the central partition plate.

6. The image sensor according to claim 1, characterized in that: There are two fixed walls and two movable walls, which are respectively arranged on two sides of the central partition plate in opposite directions.

7. The image sensor according to claim 6, characterized in that: A gasket structure is arranged on the periphery of the first through hole of at least one movable wall away from the central partition plate.

8. The image sensor according to claim 7, characterized in that: No gasket structure is arranged around the periphery of the first through hole of at least one movable wall.

9. The image sensor according to claim 1, characterized in that: The structural member and the movable wall are also provided with guiding structures that cooperate with each other.

10. The image sensor according to claim 1, characterized in that: At least one of the structural members is provided with a countersunk hole, and the movable wall is provided with a second through hole matched with the countersunk hole.

11. The image sensor according to claim 10, characterized in that: The movable wall includes a plurality of sub-movable walls which are sequentially spliced ​​in a light-proof manner along a first direction.

12. The image sensor according to claim 11, characterized in that: Each sub-movable wall is elastically abutted against at least one structural member, and at least one sub-movable wall is provided with two second through holes that match the countersunk hole.

13. The image sensor according to claim 12, characterized in that: The structural member elastically abutting against the sub-movable wall and the structural member provided with the countersunk hole are arranged alternately.

14. The image sensor according to claim 13, characterized in that: Adjacent sub-active walls are connected to each other through folded line edges; At least one of the sub-active walls is provided with two second through holes matched with the countersunk holes, and the two countersunk holes matched with the second through holes are provided on different structural members.

15. The image sensor according to claim 11, characterized in that: The countersunk hole is arranged on the structural member elastically abutting against the sub-movable wall, and the adjacent sub-movable walls are spliced ​​with each other through linear edges.

16. The image sensor according to claim 1, characterized in that: It also includes a linear light source module with an adjustable maximum light intensity position.

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