Calibration device for calibrating pixels of camera lens of steel mesh detector

Abstract

The utility model discloses a calibration device for calibrating camera lens pixels of a steel mesh detector, which comprises a base, the base is in bolted connection with a gland, a plurality of groups of glass plates are arranged between the gland and the base, a calibration plate is clamped among the plurality of groups of glass plates, and the calibration plate adopts a small-size design, so that the position of the calibration plate can be more accurately controlled, and the calibration accuracy is improved. Errors caused by a large-size calibration plate and a large jig are reduced, so that the detection precision is improved; and the small-size calibration plates enable clamping to be simpler and more convenient, a complex large jig is not needed any more, the operation difficulty is lowered, the clamping time is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of SMT vision detection and semiconductor vision detection equipment, in particular to a calibration device for calibrating the pixel of a camera lens of a calibration stencil inspection machine. Background Art

[0002] In SMT (Surface Mount Technology) vision detection and semiconductor vision detection equipment, the calibration of the camera and the lens is an important link to ensure the detection accuracy and performance. The traditional calibration method usually uses a special glass calibration plate, which generally has a large size. When using this large-size glass calibration plate, a large fixture is required for clamping. This not only increases the complexity of the operation, but also easily causes inaccurate positioning problems during the clamping process. Its accuracy is difficult to meet the requirements of high-precision calibration. The insufficient accuracy of the fixture will lead to deviation of the calibration result, thus affecting the overall performance of the detection equipment and unable to guarantee the reliability and accuracy of the detection.

[0003] Therefore, a calibration device for calibrating the pixel of a camera lens of a calibration stencil inspection machine is proposed to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a calibration device for calibrating the pixel of a camera lens of a calibration stencil inspection machine, which solves the problems that in the traditional calibration device, a large-size calibration plate requires a large fixture for clamping, and it is easy to have inaccurate positioning problems during the clamping process, resulting in deviation of the calibration result, affecting the overall performance of the detection equipment, and unable to guarantee the reliability and accuracy of the detection.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A calibration device for calibrating the pixel of a camera lens of a calibration stencil inspection machine, which is installed on a clamping mechanism, and includes:

[0007] A base, which is detachably connected to the clamping mechanism and is provided with a first detection port;

[0008] A glass plate, which is arranged on the base;

[0009] A calibration plate, which is arranged on the glass plate and is provided with calibration holes;

[0010] A gland, which is detachably connected to the base and is provided with a second detection port corresponding to the first detection port;

[0011] Wherein, the glass plate is arranged between the base and the gland, and the size of the calibration plate does not exceed 30*30mm.

[0012] Optionally, at least two groups of the glass plates are provided, and a calibration plate is clamped between each two groups of the glass plates, and the glass plates are used to resist dust pollution.

[0013] Optionally, the glass plate is a transparent optical glass.

[0014] Optionally, a plurality of groups of calibration holes are provided, and the plurality of calibration holes are located in the central area of the calibration plate.

[0015] Optionally, the aperture of the calibration hole is 0.05 - 5 mm.

[0016] Optionally, the aperture sizes of the plurality of calibration holes are inconsistent.

[0017] Optionally, a magnetic member is detachably connected to the base, and the magnetic member is used to adsorb the base on the clamping mechanism.

[0018] Optionally, a plurality of positioning pins are provided on the base, and the plurality of positioning pins jointly enclose an installation space for accurately installing a device.

[0019] Optionally, positioning pins are provided at both ends of at least one diagonal of the glass plate.

[0020] Optionally, a screw is further included, the screw connects the gland and the base, and the screw is circumferentially distributed on the edge of the glass plate.

[0021] Compared with the prior art, the present utility model has the following beneficial effects: The calibration device of the present solution is used to be installed on a clamping mechanism. The calibration device includes a base, and the base is bolted to the gland. Among them, a plurality of groups of glass plates are provided between the gland and the base, and a calibration plate is clamped between the plurality of groups of glass plates. The calibration plate adopts a small-size design, which can more accurately control the position of the calibration plate, reduces the error caused by a large-size calibration plate and a large jig, thereby improving the detection accuracy; and the small-size calibration plate and the calibration plate make the clamping more convenient, no longer require a complex large jig, reduce the operation difficulty and the clamping time, and improve the work efficiency. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

[0023] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that the present utility model can generate and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0024] Figure 1 Schematic diagram of the structure where the calibration device for calibrating the pixel of the camera lens of the stencil inspection machine is installed on the clamping mechanism;

[0025] Figure 2 Exploded view of the calibration device for calibrating the pixel of the camera lens of the stencil inspection machine;

[0026] Figure 3 Schematic diagram of the calibration device for calibrating the pixel of the camera lens of the stencil inspection machine with some components hidden;

[0027] Illustration description:

[0028] 1. Base; 11. Positioning pin; 12. Screw; 13. Installation space; 14. First detection port; 2. Glass plate; 3. Calibration plate; 4. Pressing cover; 41. Second detection port; 5. Calibration hole; 6. Magnetic part; 7. Clamping mechanism; 8. Positioning column; 9. Locking screw; Detailed implementation manners

[0029] In order to make the utility model purpose, features, and advantages of the present utility model more obvious and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 of the present utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be intermediate components present at the same time.

[0031] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0032] Referring to Figures 1 to 3 , the embodiment of the present utility model provides a calibration device for calibrating the pixel of the camera lens of a calibration steel mesh detector, which is installed on the clamping mechanism 7, and is characterized by comprising:

[0033] A base 1, detachably connected to the clamping mechanism 7, and provided with a first detection port 14;

[0034] A glass plate 2, arranged on the base 1;

[0035] A calibration plate 3, arranged on the glass plate 2, and provided with a calibration hole 5;

[0036] A gland 4, detachably connected to the base 1, and provided with a second detection port 41 corresponding to the first detection port 14;

[0037] Wherein, the glass plate 2 is arranged between the base 1 and the gland 4, and the size of the calibration plate 3 does not exceed 30*30 mm;

[0038] At least two groups of glass plates 2 are provided, and a calibration plate 3 is clamped between the two groups of glass plates 2. The glass plates 2 are used to resist dust pollution;

[0039] The glass plate 2 is a transparent optical glass.

[0040] For the calibration device of the embodiment of the present application, the base 1 and the gland 4 are detachably connected. The base 1 is provided with a first detection port 14, and the gland 4 is provided with a second detection port 41. The two detection ports are arranged opposite to each other. The two opposite detection ports ensure that the calibration plate 3 can be accurately aligned with the center of the field of view of the camera lens; two groups of glass plates 2 are arranged between the base 1 and the gland 4, and a calibration plate 3 is clamped between the two groups of glass plates 2. The glass plates 2 are designed as transparent optical glasses. Optical glasses have high light transmittance to ensure high transparency, high refractive index and dispersion rate, excellent in terms of spectroscopically focused light, high hardness, smooth surface, and avoid damage. Most importantly, optical glasses can prevent small dust from directly falling on the steel sheet, and optical glasses are easy to clean; in addition, in addition to using transparent optical glasses, the glass plates 2 can also use anti-reflection glass, chemically resistant glass, heat-resistant glass, tempered glass, etc. Specifically, anti-reflection glass uses a special coating to reduce light reflection and improve light transmittance, and is commonly used in occasions to improve visual clarity; chemically resistant glass has the property of resisting the erosion of chemical substances such as acids and alkalis, and is suitable for laboratory or specific industrial environments; heat-resistant glass can withstand higher temperatures and is suitable for high-temperature environments or processes that require high-temperature treatment; tempered glass enhances the impact resistance of the glass through a special heat treatment process and is suitable for occasions that require additional strength and safety.

[0041] The accuracy of the calibration plate 3 is crucial for the calibration of the camera lens pixels. Dust pollution may cover or blur the calibration holes 5 on the calibration plate 3, resulting in inaccurate calibration results. By using two groups of glass plates 2 to clamp the calibration plate 3, dust can be effectively isolated, and the calibration holes 5 can be kept clearly visible, thus ensuring the calibration accuracy. At the same time, if the calibration plate 3 is contaminated by dust, it needs to be frequently cleaned, which is not only time-consuming but also may damage the calibration plate 3. Since the calibration plate 3 is protected by the glass plates 2, the operator does not need to clean it before each use, simplifying the operation process and improving work efficiency.

[0042] Correspondingly, the calibration plate 3 is designed with a small size, 30*30mm in size, and is made of stainless steel 304. Due to the small size of the calibration plate 3, the clamping fixture is also correspondingly small-sized, facilitating quick installation, storage, and transportation. At the same time, the small-size design can more precisely control the position of the calibration plate 3, reducing the errors caused by large-size calibration plates 3 and large fixtures, thereby improving the detection accuracy. Moreover, the small-size calibration plate 3 and the calibration plate 3 make the clamping more convenient, eliminating the need for complex large fixtures, reducing the operation difficulty and clamping time, and improving work efficiency. The size of the calibration plate 3 can be 30*30mm, or it can also be 25*25mm, 20*20mm, 15*15mm, etc. Among them, the 25*25mm size combination can further reduce the space occupation and is suitable for scenarios with more stringent space requirements; the 20*20mm combination is suitable for occasions that require an extremely compact design; the 15*15mm combination is suitable for micro-scale detection or high-precision calibration requirements.

[0043] Specifically, a plurality of groups of the calibration holes 5 are provided, and the plurality of calibration holes 5 are located in the central area of the calibration plate 3;

[0044] The aperture of the calibration hole 5 is 0.05 - 5mm;

[0045] The aperture sizes of the plurality of calibration holes 5 are inconsistent.

[0046] By etching the calibration plate 3 to obtain the required calibration holes 5, multiple groups of calibration holes 5 are provided and are centrally distributed in the central area of the calibration plate 3, corresponding to the centers of the first detection port 14 and the second detection port 41; in the embodiment, the calibration holes 5 are obtained by the etching process because etching is a high-precision processing technology that can produce calibration holes 5 with precise dimensions and good consistency, and etching can be used to create complex patterns and shapes, which is suitable for manufacturing the calibration plate 3 with multiple calibration holes 5 of different sizes. At the same time, the etching process will not cause mechanical stress or damage to the material surface, maintaining the flatness and optical properties of the calibration plate 3; in addition to using the etching process here, laser cutting can also be used, which can provide high precision and flexibility and is suitable for various materials, but the cost may be high; or waterjet cutting, which can cut various materials without generating a heat-affected zone; or photolithography technology, which is usually used in semiconductor manufacturing and is suitable for precision processing at the micro scale.

[0047] Based on the above, multiple groups of calibration holes 5 are provided, and the sizes of the multiple groups of apertures are all inconsistent. The aperture range of the calibration holes 5 is 0.05 - 5 mm. Providing multiple groups of calibration holes 5 provides more reference points, which helps to improve the accuracy and reliability of the calibration process. And calibration holes 5 of different sizes allow measurements to be made at different scales, which helps to detect and calibrate the performance of the camera lens at different resolutions. This design enables the calibration plate 3 to be applicable to different types of cameras and lenses, improving the versatility of the calibration plate 3. At the same time, during the calibration process, calibration holes 5 of different sizes can be quickly selected as needed, improving the efficiency of the calibration process.

[0048] Specifically, the opening specifications can be selected from 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.5, 1, 2, 3, 4, 5 mm. For a pore size of 0.05 mm, extremely high measurement resolution can be provided, which is suitable for precision measurement at the microscale and is usually applicable to wafer inspection in semiconductor manufacturing and precision alignment of microelectronic components; the 0.06 mm pore size is applicable to occasions that require a slightly larger size than 0.05 mm but still need high precision, and is generally applicable to dimensional inspection of micro-mechanical parts and manufacturing of high-precision filters; the 0.07 mm pore size can provide a resolution suitable for detecting fine features and is applicable to microscopic circuit inspection of printed circuit boards (PCBs); the 0.08 mm pore size is applicable to the detection of standard microscopic features and is usually used for alignment and inspection of micro-optical components; the 0.09 mm pore size provides moderate resolution and is applicable to general microscopic inspection requirements, such as inspection of precision components of medical devices; the 0.1 mm pore size is a relatively common high-precision measurement size, providing clear measurement marks and is commonly used in the field of precision engineering, such as calibration of precision instruments; the 0.2 mm pore size provides medium resolution and is applicable to a wide range of measurement tasks, such as dimensional inspection of electronic components and measurement of small mechanical parts; the 0.5 mm pore size provides a coarser resolution and is suitable for macroscopic scale measurement, such as conventional industrial inspection, such as dimensional verification of automotive parts; the 1 mm opening specification provides easily recognizable measurement marks and is suitable for rapid detection, such as positioning and calibration of large mechanical parts and material inspection in the construction industry; the 2 mm pore size is a calibration hole 5 with a larger size, which is convenient for rapid identification by an automated system and is applicable to an automated assembly line, such as calibration of a robot vision system; the 3 mm pore size is a further enlarged size and is suitable for measurement of large-sized objects, such as inspection of large structural parts, such as aircraft components or heavy machinery; the 4 mm pore size provides a large-sized measurement reference and helps to calibrate a wide-angle lens, such as satellite image analysis or dimensional calibration of large objects; the 5 mm pore size is the largest size of the calibration hole 5, providing an obvious reference point and is applicable to applications that require a large field of view and rapid calibration, such as rapid positioning of large objects.

[0049] In addition, the calibration holes 5 are concentrated in the central area. The calibration holes 5 in the central area are easier to align with the detection ports, simplifying the installation and calibration process of the calibration device. Moreover, the central area is less susceptible to external factors, such as temperature and humidity changes, compared to the edge area.

[0050] A number of positioning pins 11 are provided on the base 1, and the number of the positioning pins 11 jointly enclose an installation space 13, and the installation space 13 is used for accurately installing the device.

[0051] At least two ends of a diagonal line of the glass plate 2 are provided with the positioning pins 11.

[0052] It further includes a screw 12, which connects the gland 4 and the base 1, and the screw 12 is circumferentially distributed on the edge of the glass plate 2.

[0053] The base 1 and the gland 4 are cylindrical. There are four groups of positioning pins 11 and screws 12 on the base 1. These four groups of positioning pins 11 together enclose an installation space 13. The positioning pins 11 provide multiple fixing points to ensure that the glass plate 2, the calibration plate 3 and the gland 4 can be accurately aligned during installation, and then the gland 4 and the base 1 are fixed by the screw 12, so that the base 1 and the gland 4 are firmly connected, reducing human operation errors; in addition, two groups of positioning pins 11 form a combination and are arranged on both sides of the corners at the diagonal direction of the glass plate 2. By arranging the positioning pins 11 on both sides of the diagonal, the glass plate 2 can be quickly installed and disassembled conveniently, because only two points in the diagonal direction are fixed to achieve the stable placement of the glass plate 2. At the same time, since the positioning pins 11 provide accurate positioning points, the glass plate 2 can be repeatedly positioned to the exact same position as before after disassembly and reinstallation, ensuring the reuse accuracy of the equipment; correspondingly, the screw 12 is circumferentially distributed on the edge of the glass plate 2. The screw 12 is circumferentially distributed along the edge of the glass plate 2. The glass plate 2 is first preliminarily positioned by the positioning pins 11 to determine its approximate position. Subsequently, the screw 12 is evenly tightened circumferentially along the edge of the glass plate 2, gradually applying a tightening force to the glass plate 2 until the required fixing strength is reached. Since the screw 12 is circumferentially distributed, the force they apply to the glass plate 2 is uniform, avoiding local stress concentration and reducing the risk of the glass plate 2 cracking. The tightened screw 12 firmly fixes the glass plate 2 in place, preventing it from being displaced due to vibration or other external forces during use. Through such a design, the position of the glass plate 2 can be more precisely controlled to ensure its correct positioning within the installation space 13. The circumferentially distributed screw 12 helps to limit the displacement of the glass plate 2 in multiple directions and ensure its stability during use.

[0054] A magnetic part 6 is detachably connected to the base 1, and the magnetic part 6 is used to adsorb the base 1 on the clamping mechanism 7.

[0055] The base 1 and the clamping mechanism 7 are first bolted together through the positioning posts 8. To ensure a firm connection between the calibration device and the clamping mechanism 7, further, on one side of the base 1 close to the clamping mechanism 7, there is an installation groove, and a magnetic member 6 is installed in the installation groove. The magnetic member 6 is connected to the clamping mechanism 7 through a locking screw 9. When the base 1 and the clamping mechanism 7 are bolted together and the locking screw 9 connects the magnetic member 6 and the clamping mechanism 7, the magnetic member 6 is further connected to the clamping mechanism 7 by magnetic force. This design first uses bolt connection to ensure the initial fixation between the calibration device and the clamping mechanism 7, and the use of the magnetic member 6 further enhances the connection stability. The magnetic force can provide an additional fixing force on the basis of bolt connection, effectively preventing the displacement of the calibration device caused by vibration or impact. Among them, in this embodiment, the magnetic member 6 is a cylindrical magnet.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A calibration device for calibrating the pixels of a camera lens of a stencil inspection machine, which is installed on a clamping mechanism (7), and is characterized in that, Comprising: A base (1), detachably connected to the clamping mechanism (7) and provided with a first detection port (14); A glass plate (2), disposed on the base (1); A calibration plate (3), disposed on the glass plate (2) and provided with calibration holes (5); A gland (4), detachably connected to the base (1) and provided with a second detection port (41) corresponding to the first detection port (14); Wherein, the glass plate (2) is disposed between the base (1) and the gland (4), and the size of the calibration plate (3) does not exceed 30*30 mm.

2. The calibration device for calibrating the pixel of the camera lens of the calibration steel mesh inspection machine according to claim 1, characterized in that, At least two groups of the glass plates (2) are provided, and calibration plates (3) are clamped between the two groups of the glass plates (2), and the glass plates (2) are used to resist dust pollution.

3. The calibration device for calibrating the pixel of the camera lens of the stencil inspection machine according to claim 2, wherein, The glass plate (2) is a transparent optical glass.

4. The calibration device for calibrating the pixel of the camera lens of the calibration steel mesh detector according to claim 1, wherein, A plurality of groups of the calibration holes (5) are provided, and the plurality of calibration holes (5) are located in the central area of the calibration plate (3).

5. The calibration device for calibrating the pixel of the camera lens of the calibrated stencil inspection machine according to claim 4, characterized in that, The aperture of the calibration hole (5) is 0.05 - 5 mm.

6. The calibration device for calibrating the pixel of the camera lens of the calibrated stencil inspection machine according to claim 5, characterized in that, The aperture sizes of the plurality of calibration holes (5) are inconsistent.

7. The calibration device for calibrating the pixel of the camera lens of the calibration stencil inspection machine according to claim 1, characterized in that, A magnetic member (6) is detachably connected to the base (1), and the magnetic member (6) is used to adsorb the base (1) on the clamping mechanism (7).

8. The calibration device for calibrating the pixel of the camera lens of the calibrated stencil inspection machine according to claim 1, characterized in that, A plurality of positioning pins (11) are provided on the base (1), and the plurality of positioning pins (11) jointly enclose an installation space (13), and the installation space (13) is used for precise installation of devices.

9. The calibration device for calibrating the pixel of the camera lens of the calibrated stencil inspection machine according to claim 8, characterized in that, Positioning pins (11) are provided at both ends of at least one diagonal of the glass plate (2).

10. The calibration device for calibrating the pixel of the camera lens of the calibrated stencil inspection machine according to claim 1, characterized in that, It further includes a screw (12), the screw (12) connects the gland (4) and the base (1), and the screw (12) is circumferentially distributed at the edge of the glass plate (2).

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