CN114061482A - Rapid and accurate detection system for sound film size - Google Patents
Rapid and accurate detection system for sound film size Download PDFInfo
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- CN114061482A CN114061482A CN202111216566.4A CN202111216566A CN114061482A CN 114061482 A CN114061482 A CN 114061482A CN 202111216566 A CN202111216566 A CN 202111216566A CN 114061482 A CN114061482 A CN 114061482A
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- 238000004364 calculation method Methods 0.000 claims abstract description 44
- 238000012545 processing Methods 0.000 claims abstract description 20
- 239000012528 membrane Substances 0.000 claims abstract description 17
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0608—Height gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
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Abstract
A system for rapidly and accurately detecting the size of a sound film comprises a two-dimensional driving base, an image acquisition device and an image processing module. The two-dimensional driving base is used for bearing the sound film to be detected. The image acquisition device is used for photographing the sound film placed on the two-dimensional driving base. The image processing module comprises a coordinate positioning module, an image contour calculation module, a sound film height detection module and a sound film flatness detection module. The coordinate positioning module is used for setting a two-dimensional coordinate system on the image of the sound film. The image contour calculation module is used for calculating the contour size of the image of the sound film. The sound film height detection module is used for calculating the height of the sound film. And the sound film flatness detection module is used for calculating the flatness of the sound film according to the data in the two-dimensional coordinate system. This quick accurate detecting system of sound membrane size not only can use manpower sparingly widely, can improve the accuracy nature that detects moreover.
Description
Technical Field
The invention relates to the technical field of winding equipment, in particular to a system for quickly and accurately detecting the size of a sound film.
Background
The diaphragm, which is a component of a loudspeaker vibration system, is an important component for implementing electro-acoustic conversion, as a main controlling component of the loudspeaker. When the sound films are produced in batches, the vibration amplitudes of part of the sound films are different. When the sound film is applied to the earphone, the amplitudes of the two sound films on the same earphone are required to be consistent. The conventional earphone manufacturer usually performs a vibration amplitude test after the earphone is assembled, and if the amplitudes of the two sound films on the earphone are not consistent, the finished product needs to be disassembled to replace the sound films, and the measurement is performed after the earphone is assembled until the amplitudes of the two sound films are consistent. However, if the amplitudes of the sound films on the two sides of the earphone are not consistent, a large amount of labor time is wasted in the process of assembling and disassembling the earphone, the sound film material is wasted, and the production efficiency and the yield of finished products are reduced.
Therefore, the sound membrane needs to be detected, and particularly, the size of the sound membrane needs to be detected to detect whether the size of the sound membrane meets the requirement or standard. However, the existing detection method needs to use the jigs to detect the sound membrane manually, which not only wastes manpower, but also causes detection errors and affects the quality of the speaker using the sound membrane.
Disclosure of Invention
In view of the above, the present invention provides a system for rapidly and accurately detecting the size of a sound diaphragm, which can solve the above problems.
A rapid and accurate detection system for the size of a sound film comprises a two-dimensional driving base, an image acquisition device arranged on the two-dimensional driving base, and an image processing module. The two-dimensional driving base is used for bearing the sound film to be detected. The image acquisition device is used for photographing the sound film placed on the two-dimensional driving base. The image processing module comprises a coordinate positioning module, an image contour calculation module, a sound film height detection module and a sound film flatness detection module. The coordinate positioning module is used for setting a two-dimensional coordinate system on the image of the sound film. The image contour calculation module is used for calculating the contour size of the image of the sound film according to the data of the two-dimensional coordinate system. And the sound film height detection module is used for calculating the height of the sound film according to the data in the two-dimensional coordinate system. And the sound film flatness detection module is used for calculating the flatness of the sound film according to the data in the two-dimensional coordinate system.
Further, the image capturing device comprises a high-definition camera.
Further, the coordinate positioning module includes a center calculating unit, the center calculating unit is configured to calculate a center point of the image of the sound diaphragm, and a center of the two-dimensional coordinate system is disposed on the center point.
Further, the two-dimensional driving base comprises a placing screen, the image contour calculation module comprises a placing screen gray calculation unit, a sound film gray calculation unit and a comparison unit, the placing screen gray calculation unit is used for calculating a placing screen gray value of an image at a placing screen position, the sound film gray calculation unit is used for calculating a sound film gray value of a sound film image, the comparison unit is used for comparing the placing screen gray value with the sound film gray value and outputting a coordinate value of the position when the placing screen gray value is equal to the sound film gray value, and a contour formed by the coordinate value is a contour of the sound film image.
Further, the sound diaphragm height detection module comprises a start point and end point setting module for setting a start point and an end point in the image contour, and a height calculation module for setting a two-dimensional coordinate of the start point and a two-dimensional coordinate of the end point in the image contour calculated by the image contour calculation module, wherein the height calculation module scans from the start point to the end point through the image acquisition device to obtain a height value of each point so as to calculate the absolute height and the relative height of the sound diaphragm.
Further, sound membrane roughness detection module includes a benchmark setting module, a setting-out module, a benchmark circle setting module to and a roughness calculation module, benchmark setting module is used for setting up four at least points that are in four quadrants of two-dimensional coordinate system respectively in sound membrane image profile, the setting-out module is used for setting up the straight line through two points and central point in sound membrane image profile, benchmark circle setting module be used for in sound membrane image profile with the central point sets up the circle of arbitrary diameter as the centre of a circle, the roughness calculation module is used for using the nodical between circle and the straight line to calculate the benchmark and compare the difference between this a plurality of calculation benchmarks in order to obtain the roughness.
Furthermore, the system for rapidly and accurately detecting the size of the sound film further comprises a template storage module, wherein the template storage module is used for storing a coordinate system of a certain type of standard sound film, contour data of the sound film, height data of the sound film and flatness data of the sound film.
Further, after a certain sound film is detected, if the size of the sound film meets the requirement, the template storage module stores the size data of the sound film and takes the size data as standard data.
Further, the system for rapidly and accurately detecting the size of the voice diaphragm further comprises a one-key detection module, and the one-key detection module is used for comparing the data obtained by the image processing module with the data in the template storage module to obtain whether the tested voice diaphragm is qualified or not.
Compared with the prior art, the sound film size rapid and accurate detection system provided by the invention can rapidly acquire the image data of the sound film in a scanning mode through the mutual matching of the two-dimensional driving base and the image acquisition device, then process the image data of the sound film through the image processing device, and rapidly acquire the size data of the sound film, such as profile data, absolute height, relative height, flatness and the like, so that the sound film can be rapidly detected. Particularly, when one standard sound film is detected, the obtained data is the standard data and is stored, and when other sound films are detected, the size data can be quickly obtained through the detection system, and then the comparison with the standard data can be carried out to obtain the conclusion whether the sound film is qualified or not. Meanwhile, the comparison can be edited into a program and then is finished by manual one-key processing, so that the purpose of one-key detection is achieved, the labor is greatly saved, and the detection accuracy can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a sound film size rapid and accurate detection system provided by the present invention.
FIG. 2 is a schematic diagram of a partially exploded structure of the sound film size rapid and accurate detection system of FIG. 1
Detailed Description
Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
Fig. 1 to 2 are schematic structural diagrams of a sound diaphragm size rapid and accurate detection system provided by the present invention. The system for rapidly and accurately detecting the size of the voice diaphragm comprises a two-dimensional driving base 10, an image acquisition device 20 arranged on the two-dimensional driving base 10, and an image processing module 30. It is conceivable that the system for rapidly and accurately detecting the sound diaphragm size further includes other functional modules, such as an electronic control module, a motor driving module, a motor control module, and the like, which are well known to those skilled in the art and will not be described herein again.
The two-dimensional driving base 10 is disposed on a machine platform and includes a placement screen and a two-dimensional driving mechanism for driving the placement screen to perform two-dimensional motion. The placing screen is used for placing the sound film to be detected. The color of the placement screen can be set according to actual requirements. Since the contour data of the sound film needs to be detected, the color of the placing screen and the color of the sound film need to have a relatively large color difference to facilitate the calculation of the contour of the sound film. In this embodiment, since the color of the sound film is black, the color of the placement screen is opaque white, such as milky white. The two-dimensional driving mechanism may include a servo motor, a screw, a slider, a guide rail, etc., which are known in the art and will not be described in detail herein.
The image acquiring device 20 is disposed on the machine and includes a high-precision camera, which can acquire the data of the sound film by scanning and photographing. The photographing of the whole sound film can be completed by the two-dimensional driving device 10. However, it is conceivable that the two-dimensional driving device 10 and the image capturing device 20 cannot distinguish the sound film from the placement screen, and therefore the image captured by the image capturing device 20 includes the placement screen, and therefore the sound film and the placement screen need to be distinguished in the subsequent image processing to obtain the contour data of the sound film image.
The image processing module 30 includes a coordinate locating module 31, an image contour calculating module 32, a voice diaphragm height detecting module 33, and a voice diaphragm flatness detecting module 34. It is contemplated that the image processing module 30 may also include other image processing functions, such as area data calculation, length or width data calculation, etc., which may be increased or decreased according to actual needs, and will not be described herein.
The coordinate positioning module 31 is configured to set a two-dimensional coordinate system on the image of the sound film. To set up the two-dimensional coordinate system, the coordinate locating module 31 comprises a central computing unit 311. The center calculating unit 311 is used to calculate the center point of the image of the sound diaphragm, and the method for calculating the center point should be the prior art, since the sound diaphragm is a regular product in general, and thus can be obtained by a diagonal method. After calculating the center point, the coordinate positioning module 31 sets the coordinate system on the center point. By setting the two-dimensional coordinate system, a coordinate value can be given to each pixel point of the sound film image, so that subsequent positioning and calculation are facilitated.
The image contour calculation module 32 is configured to calculate a contour size of the image of the sound diaphragm according to the data of the two-dimensional coordinate system. The image contour calculation module 32 includes a placement screen gradation calculation unit 321, a diaphragm gradation calculation unit 322, and a comparison unit 323. The placing screen gray scale calculating unit 321 is configured to calculate a placing screen gray scale value of the image of the placing screen position. Since the image captured by the image capturing module 20 is a color picture, different areas have different colors, and therefore, the outline of the sound film can be calculated by comparing the gray levels. The sound membrane gray scale calculation unit 322 is used for calculating the sound membrane gray scale value of the sound membrane image. The gray scale value of the placement screen and the gray scale value of the sound film are calculated respectively, the gray scale value of the placement screen and the gray scale value of the sound film are compared through the comparison unit 323, and when the gray scale value of the placement screen is equal to the gray scale value of the sound film, the coordinate value of the position is output, and the contour formed by the coordinate value is the contour of the sound film image.
The sound film height detection module 33 is configured to calculate the height of the sound film according to the data in the two-dimensional coordinate system. The voice diaphragm height detection module 33 includes a start point and end point setting module 331 for setting a start point and an end point within the image contour, and a height calculation module 332. The start and end point setting module 331 is configured to set two-dimensional coordinates of a start point and two-dimensional coordinates of an end point within the image contour calculated by the image contour calculating module 32. It will be appreciated that the start and end points may be provided at any two points, preferably at two points at either end of a diameter. The height calculating module 332 scans from the starting point to the end point through the image capturing device 20 to obtain the height value of each point so as to calculate the absolute height and the relative height of the voice diaphragm. The height value should be calculated with reference to the placement screen. The absolute height is the distance from a point on the sound film to the placement screen. The relative height is the distance between two points on the diaphragm. The absolute height and the relative height of each point on the sound film can be accurately calculated by the sound film height detection module 33
The diaphragm flatness detection module 34 is configured to calculate the flatness of the diaphragm according to the data in the two-dimensional coordinate system. The flatness is data of a difference between a plane formed by an arbitrary plurality of points on the sound film and an absolute horizontal plane, and the smaller the value, the better. The sound film flatness detection module 34 includes a reference point setting module 341, a line drawing module 342, a reference circle setting module 343, and a flatness calculation module 344. The reference point setting module 341 is configured to set at least four points in four quadrants of the two-dimensional coordinate system in the sound film image profile. Since at least four points are in different quadrants of the two-dimensional coordinate system, when points in different quadrants are connected together, their connecting line will pass through the center point. The line drawing module 342 is thus used to set a straight line passing through the points of the two different quadrants and the center point within the voice diaphragm image contour. The coordinate value of any one point on the connection line between the two points can be recorded by the line drawing module 342. The reference circle setting module 32 is configured to set a circle with any diameter in the sound film image profile with the center point as a center. It is conceivable that the straight line drawn by the line drawing module 343 and the circle set by the reference circle setting module 32 are coordinate values formed in a two-dimensional coordinate system. The flatness calculating module 344 is configured to use the intersection point between the circle and the straight line as a calculation reference point and compare and calculate the difference between the plurality of calculation reference points to obtain the flatness. The circle and the straight line are respectively set by the line drawing module 342 and the reference circle setting module 32, and therefore the coordinate value of the intersection point of the circle and the straight line is determined. The flatness calculating module 344 may calculate the heights of the coordinate values of the intersection points, and then calculate the difference between the heights of the coordinate values of the intersection points, so as to obtain the flatness of the sound film.
In order to facilitate the detection and achieve the purpose of one-key detection, the system for rapidly and accurately detecting the size of the voice diaphragm further comprises a template storage module 40 and a one-key detection module 50. The template storage module 40 is used for storing a coordinate system of a certain type of standard sound film, profile data of the sound film, height data of the sound film and flatness data of the sound film. The standard sound film should be a sound film that meets the requirement after being detected by the image processing module 30, and therefore, the coordinate system of the standard sound film, the contour data of the sound film, the height data of the sound film, and the flatness data of the sound film are qualified data or standard data. When the qualified data or the standard data is stored in the template storage module 40, the size data of the sound diaphragm is the reference data. When other sound films of the same type are detected, after the image processing module 30 detects the corresponding size data of the sound film, the detected size data is compared with the standard data stored in the template storage module 40 to determine whether the detected sound film is qualified. The one-touch detection module 50 may be a driving control module, which may sequentially complete the movement of the two-dimensional driving base 10, the image acquisition module 20 to acquire the image, the image processing module 30 to process the acquired image, and retrieve the data in the template storage module 40 by a program, and compare the detected data with the standard data to determine whether the detected sound membrane is qualified. It should be noted that all the above-mentioned control can be completed by program editing, such as by C language, etc., which is the prior art, that is, a person skilled in the art can program a corresponding control program as long as he or she knows the idea created by the present invention, and therefore, detailed descriptions of the computer program are omitted here.
Compared with the prior art, the sound film size rapid and accurate detection system provided by the invention can rapidly acquire the image data of the sound film in a scanning manner by the mutual matching of the two-dimensional driving base 10 and the image acquisition device 20, and then process the image data of the sound film through the image processing device 30, so that the size data of the sound film, such as profile data, absolute height, relative height, flatness and the like, can be rapidly acquired, and the sound film can be rapidly subjected to size detection. Particularly, when one standard sound film is detected, the obtained data is the standard data and is stored, and when other sound films are detected, the size data can be quickly obtained through the detection system, and then the comparison with the standard data can be carried out to obtain the conclusion whether the sound film is qualified or not. Meanwhile, the comparison can be edited into a program and then is finished by manual one-key processing, so that the purpose of one-key detection is achieved, the labor is greatly saved, and the detection accuracy can be improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.
Claims (9)
1. The utility model provides a quick accurate detecting system of sound membrane size which characterized in that: the sound film size rapid and accurate detection system comprises a two-dimensional driving base, an image acquisition device and an image processing module, wherein the image acquisition device is arranged on the two-dimensional driving base, the two-dimensional driving base is used for bearing a detected sound film, the image acquisition device is used for photographing the sound film placed on the two-dimensional driving base, the image processing module comprises a coordinate positioning module, an image contour calculation module, a sound film height detection module and a sound film flatness detection module, the coordinate positioning module is used for setting a two-dimensional coordinate system on an image of the sound film, the image contour calculation module is used for calculating the contour size of the image of the sound film according to the data of the two-dimensional coordinate system, the sound film height detection module is used for calculating the height of the sound film according to the data in the two-dimensional coordinate system, and the sound film flatness detection module is used for calculating the flatness of the sound film according to the data in the two-dimensional coordinate system.
2. The system for rapidly and accurately detecting the size of the voice diaphragm according to claim 1, wherein: the image capture device includes a high definition camera.
3. The system for rapidly and accurately detecting the size of the voice diaphragm according to claim 1, wherein: the coordinate positioning module comprises a central calculation unit, the central calculation unit is used for calculating the central point of the image of the sound film, and the center of the two-dimensional coordinate system is arranged on the central point.
4. The system for rapidly and accurately detecting the size of the voice diaphragm according to claim 1, wherein: the two-dimensional driving base comprises a placing screen, the image contour calculation module comprises a placing screen gray calculation unit, a sound film gray calculation unit and a comparison unit, the placing screen gray calculation unit is used for calculating a placing screen gray value of an image at a placing screen position, the sound film gray calculation unit is used for calculating a sound film gray value of a sound film image, the comparison unit is used for comparing the placing screen gray value with the sound film gray value and outputting a coordinate value of the position when the placing screen gray value is equal to the sound film gray value, and a contour formed by the coordinate value is a contour of the sound film image.
5. The system for rapidly and accurately detecting the size of the voice diaphragm according to claim 1, wherein: the sound membrane height detection module comprises a starting point and end point setting module used for setting a starting point and an end point in the image outline, and a height calculation module, wherein the starting point and end point setting module is used for setting a two-dimensional coordinate of the starting point and a two-dimensional coordinate of the end point in the image outline calculated by the image outline calculation module, and the height calculation module scans from the starting point to the end point through the image acquisition device to obtain a height value of each point so as to calculate the absolute height and the relative height of the sound membrane.
6. The system for rapidly and accurately detecting the size of the voice diaphragm according to claim 1, wherein: the voice diaphragm flatness detection module comprises a datum point setting module, a line drawing module, a datum circle setting module and a flatness calculation module, wherein the datum point setting module is used for setting at least four points which are respectively in four quadrants of a two-dimensional coordinate system in a voice diaphragm image outline, the line drawing module is used for setting straight lines passing through two points and a central point in the voice diaphragm image outline, the datum circle setting module is used for setting the circle with the central point as the center of the circle to set any diameter in the voice diaphragm image outline, and the flatness calculation module is used for calculating the difference between the datum points by using intersection points between the circle and the straight lines as calculation datum points and comparing the calculation datum points so as to obtain the flatness.
7. The system for rapidly and accurately detecting the size of the voice diaphragm according to claim 1, wherein: the system for rapidly and accurately detecting the size of the sound film further comprises a template storage module, wherein the template storage module is used for storing a coordinate system of a certain type of standard sound film, outline data of the sound film, height data of the sound film and flatness data of the sound film.
8. The system for rapidly and accurately detecting the size of the voice diaphragm according to claim 7, wherein: after a certain sound film is detected, if the size of the sound film meets the requirement, the template storage module stores the size data of the sound film and takes the size data as standard data.
9. The system for rapidly and accurately detecting the size of the voice diaphragm according to claim 7, wherein: the system for rapidly and accurately detecting the size of the voice diaphragm further comprises a one-key detection module, and the one-key detection module is used for comparing the data obtained by the image processing module with the data in the template storage module to obtain whether the tested voice diaphragm is qualified or not.
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