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

Abstract

The invention 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; 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 present invention relates to the technical field of SMT visual inspection and semiconductor visual inspection equipment, and in particular to a calibration device for calibrating the pixels of a camera lens of a steel mesh inspection machine. Background Art

[0002] In SMT (surface mount technology) visual inspection and semiconductor visual inspection equipment, the calibration of cameras and lenses is an important part of ensuring inspection accuracy and performance. Traditional calibration methods usually use special glass calibration plates, which are generally large in size. Using such large-sized glass calibration plates requires a large fixture to clamp them, which not only increases the complexity of the operation, but also easily leads to inaccurate positioning problems during the clamping process. Its accuracy is difficult to meet the needs of high-precision calibration. The insufficient accuracy of the fixture will lead to deviations in the calibration results, thereby affecting the overall performance of the inspection equipment and failing to guarantee the reliability and accuracy of the inspection.

[0003] Therefore, a calibration device for calibrating the pixels of a camera lens of a steel mesh inspection machine is proposed to solve the above-mentioned problem. Summary of the invention

[0004] The purpose of the present invention is to provide a calibration device for calibrating the pixels of the camera lens of a steel mesh detection machine, so as to solve the problem that the large-size calibration plate in the traditional calibration device needs to be clamped with a large fixture, and inaccurate positioning is prone to occur during the clamping process, resulting in deviations in the calibration results, affecting the overall performance of the detection equipment, and failing to guarantee the reliability and accuracy of the detection.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A calibration device for calibrating the pixels of a camera lens of a steel mesh inspection machine, mounted on a clamping mechanism, comprises:

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

[0008] A glass plate, disposed on the base;

[0009] A calibration plate, which is arranged on the glass plate and has a calibration hole;

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

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

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

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

[0014] Optionally, the calibration holes are arranged in several groups, and several of the calibration holes are located in the central area of ​​the calibration plate.

[0015] Optionally, the diameter 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 component is detachably connected to the base, and the magnetic component is used to adsorb the base onto the clamping mechanism.

[0018] Optionally, a plurality of positioning pins are provided on the base, and the plurality of positioning pins together enclose an installation space, and the installation space is used for precise installation of the device.

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

[0020] Optionally, it also includes a screw rod, which connects the pressure cover and the base, and the screw rod is circumferentially distributed on the edge of the glass plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the calibration device of the present invention is used to be installed on the clamping mechanism, the calibration device includes a base, the base is connected to the pressure cover by bolts, wherein a plurality of glass plates are arranged between the pressure cover and the base, a calibration plate is sandwiched between the plurality of glass plates, the calibration plate adopts a small-size design, the position of the calibration plate can be more accurately controlled, the error caused by the large-size calibration plate and the large fixture is reduced, thereby improving the detection accuracy; and the small-size calibration plate and the calibration plate make clamping easier, and no complex large fixture is required, thereby reducing the operation difficulty and the clamping time, and improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0024] Figure 1 A schematic diagram of the structure of a calibration device for calibrating the pixels of a steel mesh inspection machine camera lens installed on a clamping mechanism;

[0025] Figure 2 An exploded view of the calibration device for calibrating the camera lens pixels of the steel mesh inspection machine;

[0026] Figure 3 A schematic diagram showing hidden components of a calibration device for calibrating the pixels of a steel mesh inspection machine camera lens;

[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. Pressure cover; 41. Second detection port; 5. Calibration hole; 6. Magnetic part; 7. Clamping mechanism; 8. Positioning column; 9. Locking screw. DETAILED DESCRIPTION

[0029] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0031] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0032] Reference Figures 1 to 3 The embodiment of the present invention provides a calibration device for calibrating the pixels of a camera lens of a steel mesh inspection machine, which is installed on a clamping mechanism 7 and is characterized in that it includes:

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

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

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

[0036] A gland 4 is detachably connected to the base 1 and is 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 pressure cover 4, and the size of the calibration plate 3 does not exceed 30*30mm;

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

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

[0040] The calibration device of the embodiment of the present application has a base 1 and a pressure cover 4 that are detachably connected. A first detection port 14 is provided on the base 1, and a second detection port 41 is provided on the pressure cover 4. The two detection ports are arranged opposite to each other, and the two oppositely arranged 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 pressure cover 4, and a calibration plate 3 is sandwiched between the two groups of glass plates 2. The glass plates 2 are designed as transparent optical glass. The optical glass has high transmittance to ensure high transparency, high refractive index and dispersion rate, so that it is excellent in terms of spectroscopic spotlight, has high hardness, and a smooth surface to avoid damage. Most importantly, the optical glass can block small dust from falling directly on the steel sheet. , and the optical glass is easy to clean; in addition, in addition to transparent optical glass, the glass plate 2 can also be made of anti-reflective glass, chemical corrosion-resistant glass, heat-resistant glass and tempered glass. Specifically, anti-reflective glass uses a special coating to reduce light reflection and improve light transmittance, and is often used in occasions to improve visual clarity; chemical corrosion-resistant glass has the characteristics of resisting corrosion by chemical substances such as acids and alkalis, and is suitable for laboratories 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 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 sets of glass plates 2 to clamp the calibration plate 3, dust can be effectively isolated and the calibration holes 5 can be kept clear and visible, thereby ensuring calibration accuracy; at the same time, if the calibration plate 3 is contaminated by dust, it needs to be cleaned frequently, which is not only time-consuming but also may damage the calibration plate 3. Since the calibration plate 3 is protected by the glass plate 2, the operator does not need to clean it before each use, which simplifies the operation process and improves work efficiency.

[0042] Correspondingly, the calibration plate 3 adopts a small-size design, with a size of 30*30mm and is made of stainless steel 304. Due to the small size of the calibration plate 3, the clamping fixture also adopts a small size accordingly, so as to facilitate quick installation, storage and transportation. At the same time, the small-size design can more accurately control the position of the calibration plate 3, reducing the error caused by the large-size calibration plate 3 and the large fixture, thereby improving the detection accuracy; and the small-size calibration plate 3 and the calibration plate 3 make clamping easier, and no longer require complex large fixtures, which reduces the operation difficulty and clamping time, and improves work efficiency; in addition to 30*30mm, the size of the calibration plate 3 can also be 25*25mm, 20*20mm and 15*15mm, among which the combination of 25*25mm can further reduce the space occupancy, and is suitable for scenes with stricter space requirements; the combination of 20*20mm is suitable for occasions that require extremely compact design; the combination of 15*15mm is suitable for micro-scale detection or high-precision calibration needs.

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

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

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

[0046] The calibration plate 3 is etched to obtain the required calibration holes 5. The calibration holes 5 are provided in multiple groups and are concentrated 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 etching because etching is a high-precision processing technology that can produce calibration holes 5 with precise dimensions and good consistency. Etching can be used to create complex patterns and shapes, and is suitable for manufacturing calibration plates 3 with calibration holes 5 of various sizes. At the same time, etching will not cause mechanical stress or damage to the material surface, and maintains the flatness and optical properties of the calibration plate 3. In addition to etching, laser cutting can also be used, which can provide high precision and flexibility and is suitable for various materials, but the cost may be higher; or water jet cutting, which can cut various materials without generating heat-affected zones; or photolithography technology, which is usually used in semiconductor manufacturing and is suitable for micro-scale precision processing.

[0047] Based on the above, multiple groups of calibration holes 5 are provided, and the sizes of the multiple groups of apertures are inconsistent. The aperture range of the calibration holes 5 is 0.05 to 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. Calibration holes 5 of different sizes allow measurements on different scales, which helps to detect and calibrate the performance of the camera lens at different resolutions. This design allows the calibration plate 3 to be suitable for different types of cameras and lenses, thereby 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, thereby improving the efficiency of the calibration process.

[0048] Specifically, the hole 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, and 5 mm. For an aperture of 0.05 mm, it can provide extremely high measurement resolution, which is suitable for precision measurement of microscopic scales, and is usually suitable for wafer inspection in semiconductor manufacturing and precision alignment of microelectronic components; an aperture of 0.06 mm is suitable for occasions that require a slightly larger size than 0.05 mm but still require high precision, and is generally suitable for size detection of micro-mechanical parts and high-precision filtering. The aperture of 0.07mm provides a resolution suitable for fine feature detection, which is suitable for microscopic line detection of printed circuit boards (PCBs); the aperture of 0.08mm is suitable for the detection of standard microscopic features, which is usually used in the alignment and detection of micro-optical components; the aperture of 0.09mm provides a moderate resolution, which is suitable for general microscopic detection needs, such as the detection of precision parts of medical devices; the aperture of 0.1mm provides a clear measurement mark for the more common high-precision measurement size, which is commonly used in precision engineering fields, such as Calibration of precision instruments; 0.2mm aperture, providing medium resolution, suitable for a wide range of measurement tasks, such as dimensional inspection of electronic components, measurement of small mechanical parts; 0.5mm aperture, providing coarse resolution, suitable for macro-scale measurement, such as routine industrial inspection, such as dimensional verification of automotive parts; 1mm opening specification, providing easily recognizable measurement marks, suitable for rapid inspection, such as positioning and calibration of large mechanical parts, material inspection in the construction industry; 2mm aperture, for larger calibration hole 5, convenient for rapid identification by automated systems, suitable for automated assembly lines, such as calibration of robot vision systems; 3mm aperture, further increased size, suitable for measurement of large objects, such as inspection of large structural parts, such as aircraft parts or heavy machinery; 4mm aperture, providing large-size measurement reference, helpful for calibrating wide-angle lenses, such as satellite image analysis or dimensional calibration of large objects; 5mm aperture, the largest calibration hole 5 size, provides obvious reference points, suitable for applications requiring 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, and the calibration holes 5 in the central area are easier to align with the detection port, which simplifies the installation and calibration process of the calibration device. Compared with the edge area, the central area is less susceptible to external factors such as temperature and humidity changes.

[0050] The base 1 is provided with a plurality of positioning pins 11, and the plurality of positioning pins 11 together enclose an installation space 13, and the installation space 13 is used for accurate installation of the device;

[0051] The glass plate 2 is provided with positioning pins 11 at both ends of at least one diagonal line;

[0052] It also includes a screw 12 , which connects the pressure cover 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 pressure cover 4 are cylindrical, and four groups of positioning pins 11 and screws 12 are provided on the base 1. The 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 pressure cover 4 can be accurately aligned during installation, and then the pressure cover 4 and the base 1 are fixed by the screws 12, so that the base 1 and the pressure cover 4 are firmly connected, reducing human operation errors; in addition, two groups of positioning pins 11 are a combination, which are arranged on both sides of the corners of the glass plate 2 in the diagonal direction. By arranging positioning pins 11 on both sides of the diagonal, the glass plate 2 can be easily and quickly installed and disassembled, because only two points in the diagonal direction are needed to fix, so that the glass plate 2 can be stably placed. At the same time, because the positioning pins 11 provide precise positioning points, the glass plate 2 can be repeatedly positioned to the same position as before after disassembly and reinstallation, ensuring the installation The glass plate 2 is first initially positioned by the positioning pin 11 to determine its approximate position. Subsequently, the screws 12 are tightened evenly along the circumference of the edge of the glass plate 2, and a tightening force is gradually applied to the glass plate 2 until the required fixing strength is reached. Since the screws 12 are circumferentially distributed, the force they apply to the glass plate 2 is uniform, thus avoiding local stress concentration and reducing the risk of the glass plate 2 breaking. The tightened screws 12 firmly fix the glass plate 2 in place to prevent it from being displaced due to vibration or other external forces during use. Such a design can more accurately control the position of the glass plate 2 to ensure that it is correctly positioned in the installation space 13. The circumferentially distributed screws 12 help to limit the displacement of the glass plate 2 in multiple directions to ensure that it remains stable during use.

[0054] The base 1 is detachably connected to a magnetic component 6 , and the magnetic component 6 is used to adsorb the base 1 onto a clamping mechanism 7 .

[0055] The base 1 and the clamping mechanism 7 are firstly connected by bolts through the positioning column 8. In order to ensure the tight connection between the calibration device and the clamping mechanism 7, a mounting groove is further provided on the side of the base 1 close to the clamping mechanism 7. A magnetic part 6 is installed in the mounting groove. The magnetic part 6 is connected to the clamping mechanism 7 through a locking screw 9. When the base 1 is bolted to the clamping mechanism 7 and the locking screw 9 connects the magnetic part 6 to the clamping mechanism 7, the magnetic part 6 is further connected to the clamping mechanism 7 through magnetic force. This design first utilizes bolt connection to ensure the initial fixation between the calibration device and the clamping mechanism 7, and the use of the magnetic part 6 further enhances the stability of the connection. The magnetic force can provide additional fixing force on the basis of the bolt connection, effectively preventing the calibration device from being displaced due to vibration or impact. In this embodiment, the magnetic part 6 is a cylindrical magnet. The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A calibration device for calibrating the pixels of a steel mesh inspection machine camera lens, mounted on a clamping mechanism (7), characterized in that: include: A base (1) is detachably connected to the clamping mechanism (7) and is provided with a first detection port (14); A glass plate (2) is arranged on the base (1); A calibration plate (3) is provided on the glass plate (2) and is provided with a calibration hole (5); A pressure cover (4) is detachably connected to the base (1) and is provided with a second detection port (41) corresponding to the first detection port (14); The glass plate (2) is arranged between the base (1) and the pressure cover (4), and the size of the calibration plate (3) does not exceed 30*30 mm.

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

3. The calibration device for calibrating the pixels of a steel mesh inspection machine camera lens according to claim 2, characterized in that: The glass plate (2) is transparent optical glass.

4. The calibration device for calibrating the pixels of a steel mesh inspection machine camera lens according to claim 1, characterized in that: The calibration holes (5) are provided in a plurality of groups, and a plurality of the calibration holes (5) are located in the central area of ​​the calibration plate (3).

5. The calibration device for calibrating the pixels of a steel mesh inspection machine camera lens according to claim 4, characterized in that: The diameter of the calibration hole (5) is 0.05-5 mm.

6. The calibration device for calibrating the pixels of a steel mesh inspection machine camera lens according to claim 5, characterized in that: The aperture sizes of several calibration holes (5) are inconsistent.

7. The calibration device for calibrating the pixels of a steel mesh inspection machine camera lens according to claim 1, characterized in that: The base (1) is detachably connected to a magnetic component (6), and the magnetic component (6) is used to adsorb the base (1) onto a clamping mechanism (7).

8. The calibration device for calibrating the pixels of a steel mesh inspection machine camera lens according to claim 1, characterized in that: The base (1) is provided with a plurality of positioning pins (11), and the plurality of positioning pins (11) together enclose an installation space (13), and the installation space (13) is used for precise installation of the device.

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

10. The calibration device for calibrating the pixels of a steel mesh inspection machine camera lens according to claim 1, characterized in that: It also includes a screw (12), the screw (12) connecting the pressure cover (4) and the base (1), and the screw (12) is circumferentially distributed on the edge of the glass plate (2).

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