Code scanning equipment

Abstract

The invention provides code scanning equipment. The code scanning equipment comprises a code scanning main body, an illumination plate, a first polarization unit and a second polarization unit, the illumination plate is arranged in front of the code scanning body and provided with a first imaging window corresponding to a lens of the code scanning body, and a plurality of first illumination units and second illumination units are symmetrically distributed with the illumination plate as the center. The first polarization unit covers the first illumination unit and adjusts the polarization direction of light emitted by the first illumination unit to a first direction, and the second polarization unit covers the lens and only allows light in a second direction perpendicular to the first direction to be incident. According to the design, the code scanning main body is responsible for identifying and decoding a bar code, the illumination plate provides uniform illumination through the symmetrically-distributed illumination units, the first polarization unit is combined with the second polarization unit, and mirror reflection light can be effectively filtered when facing the bar code on the surface of a highly-reflective object according to the polarization principle; and the non-polarized light subjected to diffuse reflection enters the lens to participate in imaging. The lighting units are symmetrically distributed, so that the problem of low lighting uniformity of a semi-polarization lighting design is solved.

Description

Technical Field

[0001] The present application relates to the field of barcode scanning technology, and in particular to a barcode scanning device. Background Art

[0002] Barcode scanning equipment can scan barcodes and read out useful information. It is widely used in many fields such as warehousing and logistics, cash register systems, banking systems, industrial production, etc. due to its advantages such as fast input speed, high reliability, large amount of information collected, flexibility and practicality. Barcode scanning equipment often fails to scan codes in some scanning scenarios. For example, when vertically reading laser engraved barcodes on the surface of highly reflective objects, decoding often fails due to the glare generated by the highly reflective objects. In order to solve this problem, considering the characteristics of mirror reflection on the smooth surface of highly reflective objects and diffuse reflection on the rough laser engraved barcodes, some products will use polarized light illumination, that is, add a linear polarization polarizer in the light output path of the light source of the device itself to make the illumination light source polarized light, add a polarizer in the incident light path of the lens, filter out the polarized light returned by the mirror reflection of the surface of the highly reflective object, and let the non-polarized light diffusely reflected by the laser engraved barcode itself enter the lens to participate in imaging, thereby improving the contrast of the barcode itself in the imaging picture, thereby increasing the product's ability to read barcodes on the surface of highly reflective objects.

[0003] However, when this design encounters scenes such as spraying black ink on the surface of a highly reflective object, the background and barcode in the picture captured by the barcode reader are both black, which loses contrast and causes decoding failure. The product is still not easy to use. To solve this problem, traditional technology combines polarized lighting with non-polarized lighting, but common lighting designs often have the problem of poor picture uniformity due to uneven lighting spots. Summary of the invention

[0004] The purpose of the present application is to solve at least one of the above-mentioned technical defects, especially the problem of poor picture uniformity caused by the uneven illumination spot in the semi-polarized illumination scheme of the code scanning device in the prior art.

[0005] This application provides a code scanning device, including:

[0006] Scan the code subject;

[0007] The lighting board is arranged in front of the code scanning body, and is provided with a first imaging window corresponding to the lens of the code scanning body, and a plurality of first lighting units and second lighting units are symmetrically arranged with the first imaging window as the center;

[0008] A first polarizing unit is disposed in front of the lighting panel and is used to cover the first lighting unit but not cover the second lighting unit, so as to adjust the polarization direction of the light emitted by the first lighting unit to a first direction;

[0009] The second polarization unit is arranged in front of the lighting board, and is used to cover the lens of the code scanning body, and is used to allow only light in the second direction to enter the lens of the code scanning body; the first direction is perpendicular to the second direction.

[0010] In one of the embodiments, the code scanning device also includes a lens plate; the lens plate is arranged between the lighting plate and the first polarization unit, and has a second imaging window corresponding to the lens of the code scanning body, and a plurality of first lens units and second lens units are symmetrically distributed around the second imaging window; wherein the first lens unit is used to cover the first lighting unit, and the second lens unit is used to cover the second lighting unit.

[0011] In one embodiment, each of the first lens unit, the second lens unit and the lens plate are integrally formed.

[0012] In one embodiment, the first polarizing unit includes a first polarizing film, the second polarizing unit includes a second polarizing film, the code scanning device also includes a transparent front window, and the first polarizing film and the second polarizing film are attached behind the transparent front window.

[0013] In one embodiment, the first polarizing film is obtained by cutting out a first area inside a regular pattern for accommodating the second polarizing film and a second area outside a regular pattern for exposing the second lighting unit, the edge of the transparent front window coincides with the edge of the regular pattern, and the first polarizing film is attached to the back of the transparent front window according to the edge of the transparent front window.

[0014] In one embodiment, the contour of the first area includes at least one first positioning contour, and the contour of the second polarizing film includes a second positioning contour that corresponds one-to-one to the first positioning contour; the second polarizing film is attached to the transparent front window according to the position of the first positioning contour so that the second positioning contour matches the corresponding first positioning contour.

[0015] In one embodiment, the code scanning device also includes a shell, the shell includes a first limiting structure and a second limiting structure, the first limiting structure is used for limiting the installation of the transparent front window, and the second limiting structure is used for limiting the installation of the lens plate and the lighting plate.

[0016] In one embodiment, the transparent front window is fixed to the housing by gluing, and the lens plate and the lighting plate are fixed to the housing by screws.

[0017] In one embodiment, the colors of the first lighting units are the same, and the colors of the second lighting units are the same.

[0018] In one embodiment, the first direction is a 0° direction, and the second direction is a 90° direction.

[0019] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0020] The barcode scanning device in the present application includes a barcode scanning body, a lighting board, a first polarization unit and a second polarization unit. The lighting board is arranged in front of the barcode scanning body, and has a first imaging window corresponding to the lens of the barcode scanning body, and a plurality of first and second lighting units are symmetrically distributed around the first imaging window. The first polarization unit covers the first lighting unit, and adjusts the polarization direction of the light emitted by the first lighting unit to the first direction, and the second polarization unit covers the lens, and only allows light in the second direction perpendicular to the first direction to be incident. Under this design, the barcode scanning body is responsible for identifying and decoding the barcode, and the lighting board provides uniform illumination through symmetrically distributed lighting units. The first polarization unit is combined with the second polarization unit, and utilizes the polarization principle. When facing a barcode on the surface of a highly reflective object, it can effectively filter the mirror reflected light and allow the diffusely reflected non-polarized light to enter the lens to participate in imaging. It adopts a polarized and non-polarized composite lighting design to solve the problem of low ease of use of single polarization or single non-polarized lighting, and the symmetrical distribution of the lighting units solves the problem of low illumination uniformity, which improves the applicability and accuracy of the barcode scanning device in complex scenes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 This is an exploded diagram of a code scanning device in one embodiment of the present application;

[0023] Figure 2 This is an exploded diagram of a code scanning device in another embodiment of the present application;

[0024] Figure 3 This is an exploded diagram of a code scanning device in another embodiment of the present application;

[0025] Figure 4 This is an exploded diagram of a code scanning device in another embodiment of the present application;

[0026] Figure numerals: 1-illumination plate, 11-first imaging window, 12-first illumination unit, 13-second illumination unit, 2-first polarization unit, 21-first area, 22-second area, 23-first positioning contour, 3-second polarization unit, 31-second positioning contour, 4-transparent plate, 41-second imaging window, 42-first lens unit, 43-second lens unit, 5-transparent front window, 6-housing, 61-first limiting mechanism, 62-second limiting mechanism. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are used to indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the invented product is usually placed when in use, it is only for the convenience of describing the present invention 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 the present invention. In addition, if the terms "horizontal", "vertical", "overhanging" and the like are used, it does not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the embodiments of the present invention, "multiple" means at least 2.

[0031] This application provides a code scanning device, please refer to Figure 1 , including a code scanning body, an illumination board 1, a first polarization unit 2 and a second polarization unit 3.

[0032] The barcode scanning body is the core of the entire device and is responsible for identifying and decoding the barcode. It integrates key components such as the imaging unit and the computing unit. The imaging unit is usually composed of a lens, an image sensor, etc. The lens is responsible for focusing the optical image of the target barcode onto the image sensor, and the image sensor converts the optical signal into an electrical signal to generate a digital image. The computing unit can pre-process these images, such as denoising and contrast enhancement, to improve image quality. The decoding algorithm in the computing unit analyzes and decodes the processed image according to the barcode encoding rules, and finally obtains the information contained in the barcode. In practical applications, the performance of the barcode scanning body directly affects the accuracy and speed of the barcode scanning. For example, in a logistics warehousing environment, a high-speed and accurate barcode scanning body can quickly complete the in and out registration of goods and improve logistics efficiency.

[0033] The lighting board 1 is arranged in front of the code scanning body, and its function is to provide sufficient and uniform lighting for the code scanning process. A first imaging window 11 corresponding to the lens of the code scanning body is provided on the lighting board 1. This window is a channel for light to enter the code scanning body, ensuring that the imaging area can receive appropriate incident light. At the same time, since the propagation of light follows certain laws, when the light emitted by the light source shines on the surface of an object, reflection, refraction and the like will occur. For the code scanning device, to achieve uniform lighting, it is necessary to ensure that the light intensity and light distribution received at each position in the imaging area are uniform. The first lighting unit 12 and the second lighting unit 13 are symmetrically distributed around the first imaging window 11, which can project light to the imaging area from multiple angles in a relatively balanced manner.

[0034] Specifically, the symmetrical distribution enables the light emitted by the lighting units to form a complementary and balanced lighting effect in the imaging area during the propagation process. For example, when the light emitted by the first lighting unit 12 and the second lighting unit 13 is directed to the surface of the target object, since they are symmetrical relative to the center of the first imaging window 11, the reflection and scattering paths of the light in the imaging area are also symmetrical. This means that each part of the imaging area can receive light from different directions but with relatively consistent intensity, thereby avoiding the situation of local overbrightness or overdarkness caused by a single lighting direction or uneven distribution.

[0035] In addition, this symmetrical distribution can also effectively reduce the interference and shadows of light during propagation. In practical applications, if the lighting units are distributed asymmetrically, the light in some areas may block or overlap each other, resulting in shadows or uneven lighting. The design of symmetrical distribution with the first imaging window 11 as the center can make the light diffuse and distribute more evenly in the imaging area, reduce mutual interference between the light, and further improve the uniformity of lighting.

[0036] Both the first lighting unit 12 and the second lighting unit 13 are essentially similar light sources, but the first lighting unit 12 is a component of polarized lighting, and the second lighting unit 13 is a component of non-polarized lighting. The light emitted by the first lighting unit 12 will pass through the first polarization unit 2 to convert natural light into polarized light, while the light emitted by the second lighting unit 13 will not pass through the first polarization unit 2 and remain natural light. Therefore, the difference between the two mainly lies in whether there is a matching relationship with the first polarization unit 2. When selecting the setting position, shape and structure of the first polarization unit 2, it is necessary to consider the optical paths of the first lighting unit 12 and the second lighting unit 13. When selecting the positions of the first lighting unit 12 and the second lighting unit 13, it is also necessary to consider the difficulty of processing and manufacturing the first polarization unit 2. Figure 1 In the embodiment, 12 lighting units are provided in total, the second lighting units 13 are respectively located at the upper left, upper right, lower left and lower right, and the rest are first lighting units 12. Figure 1 The lighting units in the lighting board 1 are arranged in an array. If there is a first lighting unit 12 in a row, it is located in the middle of the row or the entire row is the first lighting unit 12. If there is a second lighting unit 13 in a row, it is located at the beginning and end of the row. In this way, the first lighting unit 12 is concentrated in the middle of the lighting board 1, and the second lighting units 13 are dispersed around the area where the first lighting unit 12 is concentrated, which can facilitate the processing of the first polarization unit 2.

[0037] The first polarization unit 2 is arranged in front of the lighting plate 1, and is used to cover the first lighting unit 12 and not cover the second lighting unit 13. The coverage here mainly refers to the relationship between the optical path of the first polarization unit 2 and the lighting unit. The first polarization unit 2 is located on the optical path of the first lighting unit 12, so the illumination light emitted by the first lighting unit 12 to the barcode to be scanned can be adjusted to polarized light. Since the first polarization unit 2 is not located on the optical path of the second lighting unit 13, the illumination light emitted by the second lighting unit 13 can be directly irradiated on the barcode to be scanned. This design is based on the optical properties of the surface of a highly reflective object. When a mirror reflection occurs on the surface of a highly reflective object, the reflected light often has a specific polarization direction. By adjusting the light of the first lighting unit 12 to a specific polarization direction, combined with the subsequent analysis of the second polarization unit 3, the polarized light reflected by the mirror on the surface of the highly reflective object can be effectively filtered out, allowing the non-polarized light diffusely reflected by the laser engraved barcode itself to enter the lens to participate in imaging. In actual implementation, the first polarization unit 2 can use a linear polarization polarizing device, such as Figure 1 The polarizing film used in the optical transmission system is precisely designed and installed to ensure that it can accurately adjust the polarization direction of light to the first direction.

[0038] The second polarization unit 3 is arranged in front of the lighting plate 1 to cover the lens of the code scanning body, and its function is to allow only the light in the second direction to enter the lens of the code scanning body, and the first direction is perpendicular to the second direction. When the polarized light emitted by the first lighting unit 12 is reflected by the object, only the light that meets the polarization direction (i.e., the second direction) allowed by the second polarization unit 3 can enter the lens. In this way, the unnecessary reflected light is further filtered out, the contrast of the barcode in the imaging picture is improved, and the ability of the code scanning device to read the barcode on the surface of the highly reflective object is increased. In practical applications, the second polarization unit 3 can use a linear polarization analyzer device that matches the first polarization unit 2, and by controlling its polarization direction and installation position, it is ensured that only light in a specific polarization direction can enter the lens. In this way, when scanning the laser engraved barcode on the surface of a highly reflective metal and similar scenes, the synergistic effect of the first polarization unit 2 and the second polarization unit 3 can effectively suppress the interference of the mirror reflection light, make the barcode imaging clearer, and improve the decoding success rate.

[0039] The barcode scanning device in the present application includes a barcode scanning body, an illumination board 1, a first polarization unit 2 and a second polarization unit 3. The illumination board 1 is arranged in front of the barcode scanning body, and has a first imaging window 11 corresponding to the lens of the barcode scanning body, and a plurality of first and second lighting units 13 are symmetrically distributed around it. The first polarization unit 2 covers the first lighting unit 12, and adjusts the polarization direction of the light emitted by it to the first direction. The second polarization unit 3 covers the lens, and only allows light in the second direction perpendicular to the first direction to be incident. Under this design, the barcode scanning body is responsible for identifying and decoding the barcode, and the illumination board 1 provides uniform illumination through symmetrically distributed illumination units. The first polarization unit 2 is combined with the second polarization unit 3, and utilizes the polarization principle. When facing the barcode on the surface of a highly reflective object, it can effectively filter the mirror reflected light and allow the diffusely reflected non-polarized light to enter the lens to participate in imaging. It adopts a polarized and non-polarized composite lighting design to solve the problem of low ease of use of single polarized or single non-polarized lighting, and the symmetrical distribution of the lighting units solves the problem of low illumination uniformity, which improves the applicability and accuracy of the barcode scanning device in complex scenes.

[0040] In one embodiment, see Figure 2 , the code scanning device also includes a lens plate 4. The lens plate 4 in the code scanning device is an important component, which is arranged between the lighting plate 1 and the first polarization unit 2. A second imaging window 41 corresponding to the code scanning main body lens is provided on the lens plate 4. The function of this window is similar to that of the first imaging window 11 on the lighting plate 1. It is an important channel in the process of light propagation, ensuring that the light can be accurately converged to the imaging area of ​​the code scanning main body, providing basic conditions for clear imaging. With the second imaging window 41 as the center, a plurality of first lens units 42 and second lens units 43 are symmetrically distributed. This symmetrical distribution design echoes the symmetrical distribution of the lighting unit, and together serve to achieve uniform lighting and high-quality imaging.

[0041] The first lens unit 42 is used to cover the first lighting unit 12, that is, the first lens unit 42 is located on the optical path of the first lighting unit 12, and adjusts and focuses the light emitted by the first lighting unit 12. Different lenses have specific optical curved surfaces, and the propagation direction and intensity distribution of the light can be adjusted by designing the curved surface shape and lens parameters. The first lens unit 42 optimizes the light emitted by the first lighting unit 12, so that these lights are refracted by the lens and projected onto the surface of the target object at a more appropriate angle and intensity, thereby improving the illumination uniformity and clarity of the imaging area.

[0042] The second lens unit 43 is used to cover the second lighting unit 13, that is, the second lens unit 43 is located on the optical path of the second lighting unit 13, and adjusts and focuses the light emitted by the second lighting unit 13. It cooperates with the first lens unit 42 to perform specific optical processing on the light emitted by the second lighting unit 13. In practical applications, different types of lighting units may require different lenses to optimize light propagation to meet different code scanning requirements. For example, for some scenes that require stronger light intensity, the lens unit can focus the light on the key position of the imaging area to improve the local lighting effect; for some scenes that require extremely high light uniformity, the lens unit can evenly scatter the light to the entire imaging area to avoid uneven lighting. In addition, the first lens unit 42 and the second lens unit 43 can be the same or different designs. The first lens unit 42 and the second lens unit 43 shown in the figure use free-form surfaces with different structures.

[0043] In one embodiment, each first lens unit 42, second lens unit 43 and lens plate 4 are integrally formed. The integrally formed design ensures the close combination and precise positional relationship between each lens unit and lens plate 4. Since the first lens unit 42 is used to cover the first lighting unit 12 and the second lens unit 43 is used to cover the second lighting unit 13, they need to accurately refract and focus the light emitted by the corresponding lighting unit. The integrally formed process avoids the position deviation that may occur during the assembly process, ensures that the light can propagate along the expected path, thereby improving the utilization rate of the light and the accuracy of imaging. The integrally formed process requires that when manufacturing the lens plate 4, the first lens unit 42 and the second lens unit 43 are integrally manufactured with the lens plate 4 through a specific mold and molding technology. This process can use methods such as injection molding to inject optical materials into the mold, and under the precise constraints of the mold, a lens plate 4 and each lens unit with a specific shape and structure are formed. Compared with the split design, the integrally formed process reduces the assembly links and reduces the risk of optical performance degradation due to assembly errors. At the same time, the integrally formed process can also improve production efficiency and reduce production costs. Since the number of parts and assembly procedures are reduced, the production process is simplified and quality control is easier. In addition, the one-piece design also enhances the structural stability of the lens plate 4. During the use of the barcode scanning device, it may be affected by environmental factors such as vibration and temperature changes. The one-piece lens plate 4 can better resist these external forces and maintain the stability of its optical performance. This is crucial for the long-term stable operation of the barcode scanning device in different working environments, ensuring that the barcode scanning device can accurately obtain barcode information under various complex conditions, and improving the reliability and durability of the equipment.

[0044] In one embodiment, see Figure 3 , the first polarizing unit 2 includes a first polarizing film, the second polarizing unit 3 includes a second polarizing film, and the code scanning device also includes a transparent front window 5, and the first polarizing film and the second polarizing film are attached to the transparent front window 5. The setting of the transparent front window 5 plays an important role. It not only provides a carrier for the polarizing film to attach, but also has good light transmittance, does not cause too much obstruction to the propagation of light, and ensures that the light can pass smoothly and be processed by the polarizing film. After the first polarizing film and the second polarizing film are attached to the transparent front window 5, this layout method can ensure the stability of the polarizing film. In the actual implementation method, it is necessary to accurately control the lamination process of the polarizing film and the transparent front window 5. It is necessary to ensure that the polarizing film is flat and bubble-free on the transparent front window 5 to avoid unnecessary refraction or scattering of light, which affects the imaging quality. At the same time, according to different code scanning requirements and optical parameters, select suitable polarizing film and transparent front window 5 materials, and accurately determine the position and angle of the polarizing film on the transparent front window 5 to achieve the best polarization effect and imaging performance.

[0045] In one embodiment, see Figure 3 , the first polarizing film is obtained by cutting out a first area 21 for accommodating the second polarizing film inside a regular pattern and cutting out a second area 22 for exposing the second lighting unit 13 outside. The edge of the transparent front window 5 coincides with the edge of the regular pattern, and the first polarizing film is attached to the transparent front window 5 according to the edge of the transparent front window 5. For the first area 21, its function is to provide a precise positioning space for the second polarizing film. The second polarizing film is responsible for allowing only light in a specific direction to enter the lens of the code scanning body. After the light passes through the transparent front window 5, it needs to be processed by the second polarizing film, and then enter the code scanning body through the second imaging window 41 and the first imaging window 11. In order to prevent the incident light from passing through the first polarizing film, the first area 21 is directly cut out on the first polarizing film in this embodiment to accommodate the second polarizing film. The incident light can pass through the first area 21 without being affected by the first polarizing film, but is polarized by the second polarizing film. The position where the second polarizing film is attached to the transparent front window 5 needs to correspond to the first imaging window 11 and the second imaging window 41 to ensure the existence of the optical path from the incident light to the lens of the code scanning body. Therefore, when opening the first area 21, it is necessary to select according to the positions of the lens plate 4, the lighting plate 1, the first imaging window 11, the second imaging window 41 and the lens after the code scanning body is installed. Specifically, the lens, the first imaging window 11 and the second imaging window 41 can be projected onto the transparent front window 5, and the first area 21 can be set according to the overlapping part of the projection.

[0046] The second area 22 is set to meet the light propagation requirements of the second lighting unit 13. After the light emitted by the second lighting unit 13 passes through the corresponding second lens unit 43 and reaches the transparent front window 5, since the second lighting unit 13 belongs to the non-polarized lighting part, the light emitted by it should not be affected by the first polarizing film. Therefore, when the first polarizing film is attached to the transparent front window 5, its second area 22 should be located on the light path of the second lighting unit 13 to ensure that the non-polarized light can pass through the transparent front window 5 and irradiate the barcode to be scanned.

[0047] The first polarizing film is cut from a regular pattern, where the regular pattern refers to a pattern with a clear geometric shape and features, and its edges, corners and other elements have a certain regularity, such as the number of edges and the number of corners. For the convenience of processing, these edges should all be straight lines rather than curves. The edges and corners of the regular pattern have clear geometric features, and it is easier to accurately position and operate during the cutting process, whether using mold stamping, laser cutting or other processing methods. For example, the four right angles and relatively parallel edges of the rectangle enable the cutting equipment to cut according to a preset path, reducing the possibility of processing errors. Regular patterns can make better use of raw materials and reduce the generation of waste during typesetting and splicing. Taking a rectangle as an example, multiple rectangles can be closely arranged on a raw material sheet to minimize gaps, thereby improving the utilization rate of materials and reducing production costs. In addition to the rectangle selected in the figure, regular hexagons, regular octagons, etc. can also be selected, which can be mainly determined based on the arrangement design of the first lighting unit 12 and the second lighting unit 13. In addition, the shape of the first area 21 is generally designed based on a circle to meet the light intake requirements of the lens. Of course, other shapes can also be used, as long as the optical path from the incident light to the lens is not affected. The shape of the second area 22 can generally be a non-curved shape that is easy to cut, such as a rectangle.

[0048] The selection of a regular pattern as the basic shape of the first polarizing film is also for the convenience of installation. Since the first polarizing film needs to be attached to the transparent front window 5, the shape of the transparent front window 5 is generally regular. When cutting the original first polarizing film, its size should refer to the size of the transparent front window 5 to ensure that at least one edge of the transparent front window 5 can find a corresponding overlapping edge before the regular pattern is cut. As shown in the figure, the four upper, lower, left and right edges of the transparent front window 5 correspond to the four upper, lower, left and right edges of the outside of the first polarizing film, respectively. In this way, the manufactured first polarizing film can be accurately attached to the back of the transparent front window 5 according to the edge of the transparent front window 5, thereby ensuring the position accuracy of the first polarizing film. Using the edge of the transparent front window 5 as a positioning reference can greatly simplify the installation process of the first polarizing film, reduce installation errors, and improve production efficiency.

[0049] In one embodiment, see Figure 3 The contour of the first area 21 includes at least one first positioning contour 23, and the contour of the second polarizing film includes a second positioning contour 31 corresponding to the first positioning contour 23. The second polarizing film is attached to the transparent front window 5 according to the position of the first positioning contour 23, so that the second positioning contour 31 matches the corresponding first positioning contour 23.

[0050] It can be understood that the shape and size of the second positioning contour 31 match the first positioning contour 23. Through this one-to-one correspondence, during the actual installation process, the worker only needs to align the second positioning contour 31 of the second polarizing film with the first positioning contour 23 to complete the installation of the second polarizing film. This design greatly simplifies the installation process and improves the accuracy and reliability of the installation.

[0051] Specifically, the first positioning contour 23 is a portion with a specific shape and position on the contour of the first area 21, which is set based on the optical system design of the entire barcode scanning device and the installation requirements of the second polarizing film. The existence of the first positioning contour 23 is like providing a positioning anchor point for the second polarizing film, so that the second polarizing film can determine its own accurate position according to these contours during the installation process, thereby ensuring its collaborative working effect with the first polarizing film and the entire optical system. The second positioning contour 31 matches the first positioning contour 23 in shape and size, and the two can fit tightly, such as Figure 3 The two small rectangles above and below the first area 21 are the first positioning outline 23 , and the two small rectangles above and below the second polarizing film are the second positioning outline 31 .

[0052] In one embodiment, see Figure 4 The barcode scanning device further comprises a housing 6. The housing comprises a first limiting structure 61 and a second limiting structure 62. The first limiting structure 61 is used for limiting the installation of the transparent front window 5, and the second limiting structure is used for limiting the installation of the lens plate 4 and the lighting plate 1.

[0053] It can be understood that the housing 6 is an important structural support component of the entire device. It not only plays a protective support role, but also provides accurate installation positioning for the transparent front window 5, the lens plate 4 and the lighting board 1 through the limiting structure. Specifically, the first limiting structure 61 on the housing 6 is specifically used to limit the installation of the transparent front window 5. The transparent front window 5 is not only the front channel for light to enter the device, but also carries the first polarizing film and the second polarizing film, which plays a key role in the propagation and polarization processing of light. The first limiting structure 61 can accurately limit the position and angle of the transparent front window 5 through precise size and shape design to ensure its stability in the device. This is very important to ensure that light can accurately pass through the transparent front window 5 and be processed by the polarizing film, thereby achieving high-quality imaging. For example, if the installation position of the transparent front window 5 is inaccurate, it may cause the relative position of the polarizing film and the light to deviate, thereby affecting the polarization effect and reducing the contrast and clarity of the imaging picture. Similarly, both the lighting board 1 and the lens plate 4 have imaging windows through which the light needs to pass when entering the lens, and whether their installation position and angle are accurate will also affect the imaging effect. In addition, the polarized lighting and non-polarized lighting parts need to cooperate with the first polarization unit 2 and the second polarization unit 3, and the installation position and angle of the lighting board 1 and the lens board 4 will also affect the lighting effect. Therefore, the second limiting structure 62 at the rear of the housing 6 can provide a positioning reference for the installation of the lighting board 1 and the lens board 4, and the lens board 4 and the lighting board 1 can be assembled in turn according to the shape of the second limiting structure 62.

[0054] In one of the embodiments, the transparent front window 5 is fixed to the housing 6 by gluing, and the lens plate 4 and the lighting plate 1 are fixed to the housing 6 by screws. The gluing method has the advantages of easy operation and low cost. During the production process, it is only necessary to apply an appropriate amount of glue on the contact surface between the transparent front window 5 and the housing 6, and then accurately place the transparent front window 5 in the first limiting structure 61, and wait for the glue to solidify to complete the fixation. This method does not require complex tools and equipment, can improve production efficiency, and is particularly suitable for large-scale production. Although the screw fixing method is slightly more complicated to operate than the gluing method, it has higher adjustability and reliability. During the installation process, if it is found that the position of the lens plate 4 or the lighting plate 1 is slightly deviated, it can be fine-tuned by loosening or tightening the screws to ensure installation accuracy. Moreover, the screw fixing method is convenient for disassembly and replacement during equipment maintenance and overhaul, which reduces the maintenance cost of the equipment and improves the service life and maintainability of the equipment.

[0055] In one embodiment, the color of the first lighting unit 12 is the same, and the color of the second lighting unit 13 is the same. The first lighting unit 12 and the second lighting unit 13 can both use LED lights, and lighting units with the same color can provide more uniform and stable lighting characteristics. Setting the first lighting unit 12 and the second lighting unit 13 to the same color facilitates unified procurement and management of light sources, reducing procurement costs and production complexity. At the same time, during the installation and debugging process, since the lighting units have the same color, it is easier to debug and optimize the light, thereby improving production efficiency and the stability of product quality.

[0056] In one embodiment, the first direction is a 0° direction, and the second direction is a 90° direction.

[0057] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0058] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can refer to each other.

[0059] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A code scanning device, characterized in that: include: Scan the code subject; An illumination panel is arranged in front of the code scanning body, and is provided with a first imaging window corresponding to the lens of the code scanning body, and is symmetrically provided with a plurality of first illumination units and second illumination units with the first imaging window as the center; a first polarizing unit, disposed in front of the lighting panel, and used to cover the first lighting unit but not cover the second lighting unit, so as to adjust the polarization direction of the light emitted by the first lighting unit to a first direction; The second polarization unit is arranged in front of the lighting board, and is used to cover the lens of the code scanning body, and is used to allow only light in a second direction to be incident on the lens of the code scanning body; the first direction is perpendicular to the second direction.

2. The code scanning device according to claim 1, characterized in that: It also includes a lens plate; the lens plate is arranged between the lighting plate and the first polarization unit, and is provided with a second imaging window corresponding to the lens of the code scanning body, and a plurality of first lens units and second lens units are symmetrically distributed around the second imaging window; wherein the first lens unit is used to cover the first lighting unit, and the second lens unit is used to cover the second lighting unit.

3. The code scanning device according to claim 2, characterized in that: Each of the first lens unit, the second lens unit and the lens plate are integrally formed.

4. The code scanning device according to claim 2, characterized in that: The first polarizing unit includes a first polarizing film, the second polarizing unit includes a second polarizing film, the code scanning device also includes a transparent front window, and the first polarizing film and the second polarizing film are attached behind the transparent front window.

5. The code scanning device according to claim 4, characterized in that: The first polarizing film is obtained by cutting out a first area inside a regular pattern for accommodating the second polarizing film and a second area outside a regular pattern for exposing the second lighting unit. The edge of the transparent front window coincides with the edge of the regular pattern, and the first polarizing film is attached behind the transparent front window according to the edge of the transparent front window.

6. The code scanning device according to claim 5, characterized in that: The outline of the first area includes at least one first positioning outline, and the outline of the second polarizing film includes a second positioning outline that corresponds one-to-one to the first positioning outline; the second polarizing film is attached to the back of the transparent front window according to the position of the first positioning outline so that the second positioning outline matches the corresponding first positioning outline.

7. The code scanning device according to claim 4, characterized in that: It also includes a shell, which includes a first limiting structure and a second limiting structure. The first limiting structure is used for limiting the installation of the transparent front window, and the second limiting structure is used for limiting the installation of the lens plate and the lighting plate.

8. The code scanning device according to claim 7, characterized in that: The transparent front window is fixed to the shell by gluing, and the lens plate and the lighting plate are fixed to the shell by screws.

9. The code scanning device according to claim 1, characterized in that: The colors of the first lighting units are the same, and the colors of the second lighting units are the same.

10. The code scanning device according to claim 1, characterized in that: The first direction is a 0° direction, and the second direction is a 90° direction.

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