CN114813056A - Curved surface screen defect detection device and method - Google Patents
Curved surface screen defect detection device and method Download PDFInfo
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- CN114813056A CN114813056A CN202210522656.4A CN202210522656A CN114813056A CN 114813056 A CN114813056 A CN 114813056A CN 202210522656 A CN202210522656 A CN 202210522656A CN 114813056 A CN114813056 A CN 114813056A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- G01M11/0278—Detecting defects of the object to be tested, e.g. scratches or dust
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Abstract
The invention relates to the technical field of curved screen defect detection, in particular to a curved screen defect detection device and method, which can solve the problem that the existing display screen defect detection system can detect the defects of a curved screen to a certain extent and cause the loss of spatial information of edge points of the curved screen. The device comprises an imaging module, a spectroscope, a front lighting mirror, a lighting collimating mirror, a light source module, a storage platform and a defect detection module; the imaging module is arranged on one side of the spectroscope; the front illuminating mirror is arranged on the other side of the spectroscope and used for compensating the emergent angle of the light rays reflected by the curved screen to be detected; the light source module is arranged on one side of the illumination collimating mirror, which is far away from the spectroscope; the object placing platform is arranged on one side of the front lighting mirror, which is far away from the spectroscope, and is used for placing the curved screen to be detected; the defect detection module is connected with the imaging module and used for carrying out defect detection on the curved screen image to be detected acquired by the imaging module and outputting a detection result.
Description
Technical Field
The invention relates to the technical field of curved surface screen defect detection, in particular to a curved surface screen defect detection device and method.
Background
With the increasing application scenes of digital science and technology products, the specifications and types of display screens adopted by different digital science and technology products are more and more complicated. In order to improve the production efficiency of the display screen, the defect detection needs to be carried out on the display screen. Different defect detection schemes need to be formulated for display screens of different specifications and types, so that the sensitivity and accuracy of the defect detection of the display screens are improved.
At present, as shown in fig. 1, an existing display screen defect detection system includes an imaging module, a spectroscope, a light source module, and a placement platform, where the spectroscope is disposed below the imaging module, the placement platform is disposed below the spectroscope, and the placement platform is used for placing a display screen to be detected; the light source module is arranged on one side of the spectroscope. The display screen defect detection system shown in fig. 1 adopts a coaxial illumination mode in a bright field illumination mode for illumination, the center of the imaging module, the center of the spectroscope and the center of the display screen to be detected can be positioned on the same central axis in the vertical direction by adopting the illumination mode, and the center of the light source module and the center of the spectroscope are arranged on the same central axis in the horizontal direction. The specific detection process of the display screen defect detection system shown in fig. 1 is as follows: firstly, light beams emitted by a light source module are reflected to a display screen to be detected through a spectroscope; then, the light beam reflected by the display screen to be detected carries the spatial information of each point on the display screen to be detected; further, light beams carrying spatial information of each point on the display screen to be detected are focused on a linear array camera in the imaging module through an imaging objective lens in the imaging module; and finally, acquiring the image information of the display screen to be detected by the linear array camera and transmitting the image information to the server for defect detection.
However, when the defect detection system for the display screen is used for detecting the defects of the curved screen to be detected, because the curvature radius of the curved screen to be detected is very small, when the illumination light beam generated by the coaxial illumination mode irradiates the curved screen to be detected for reflection, the exit angle of the reflection light at the edge point of the curved screen is very large, and the reflection light cannot return according to the original light path, so that the spatial information at the edge point of the curved screen cannot be received by the imaging module, and the spatial information at the edge point of the curved screen is lost.
Disclosure of Invention
The invention provides a curved surface screen defect detection device and method, aiming at solving the problem that spatial information of edge points of a curved surface screen is lost when the existing display screen defect detection system is adopted to detect the defects of the curved surface screen.
The embodiment of the invention is realized by the following steps:
in a first aspect, an embodiment of the present invention provides a curved panel defect detection apparatus, including: the device comprises an imaging module, a spectroscope, a front lighting mirror, a lighting collimating mirror, a light source module, a storage platform and a defect detection module;
the imaging module is arranged on one side of the spectroscope, and the center of the imaging module and the center of the spectroscope are arranged on the same central axis in the horizontal direction;
the front illuminating mirror is arranged on the other side of the spectroscope, the center of the front illuminating mirror and the center of the spectroscope are arranged on the same central axis in the horizontal direction, and the front illuminating mirror is used for compensating the emergent angle of the light reflected by the curved screen to be detected;
the center of the illumination collimating mirror and the center of the spectroscope are positioned on the same central axis in the vertical direction;
the light source module is arranged on one side of the illumination collimating mirror, which is far away from the spectroscope, and the center of the light source module and the center of the illumination collimating mirror are positioned on the same central axis in the vertical direction;
the object placing platform is arranged on one side, away from the spectroscope, of the front lighting mirror and used for placing the curved screen to be detected, and the curved screen to be detected is designed to be a curved cylindrical surface structure;
the defect detection module is in communication connection with the imaging module and is used for performing defect detection on the curved screen image to be detected acquired by the imaging module and outputting a detection result.
In one enablement of the first aspect, the front illumination mirror includes a first positive lens, a second positive lens;
the center of the first positive lens and the center of the second positive lens are arranged on the same central axis in the horizontal direction;
the first positive lens is arranged on one side close to the object placing platform;
the second positive lens is arranged on one side close to the spectroscope.
In an implementation manner of the first aspect, the focal length of the front illuminating mirror is calculated according to the curvature radius of the curved screen to be detected and a working distance, where the working distance is a distance between the front illuminating mirror and the curved screen to be detected.
In an implementation manner of the first aspect, the focal length of the front lighting mirror is calculated according to the following formula:
f′＝L+R，
wherein f' represents the focal length of the front lighting mirror, L represents the working distance, and R represents the curvature radius of the curved screen to be detected.
In one implementation form of the first aspect, the imaging module includes an imaging objective and a line camera;
the imaging objective lens is connected with the linear array camera;
the imaging objective lens is arranged at one side close to the spectroscope.
In an implementation form of the first aspect, the depth of field of the imaging objective is calculated as follows:
wherein, Δ L represents the depth of field of the imaging objective lens, F represents the image space number of the imaging objective lens, δ represents the minimum image space resolution of the linear array camera, F' represents the focal length of the front lighting mirror, and L represents the working distance.
In an implementation form of the first aspect, the depth of field of the imaging objective is inversely related to the minimum image resolution of the curved screen defect detecting device.
In an implementation manner of the first aspect, the minimum image-space resolution of the curved-surface screen defect detecting apparatus is calculated according to the following formula:
δ min ＝1.22λF，
wherein, delta min The minimum image space resolution of the curved screen defect detection device is represented, lambda represents the wavelength of an illumination light source in the light source module, and F represents the image space number of the imaging objective lens.
In an implementation manner of the first aspect, the curved screen defect detection device further includes a control module, and the control module is respectively in communication connection with the light source module, the imaging module and the defect detection module;
wherein the control module is used for:
when the light source module is turned on, the imaging module is controlled to collect a curved screen image to be detected, wherein the curved screen image to be detected comprises spatial information of all points on the curved screen to be detected;
controlling a defect detection module to perform defect detection on the curved screen image to be detected;
and judging whether the curved screen to be detected needs to be removed or not according to the defect detection result.
The embodiment of the invention is realized by the following steps:
in a second aspect, an embodiment of the present invention provides a curved surface screen defect detection method, including:
controlling the light source module to be turned on;
when the light source module is turned on, controlling the imaging module to acquire a curved screen image to be detected, wherein the curved screen image to be detected comprises spatial information of all points on the curved screen to be detected, and the curved screen to be detected is designed to be a curved cylindrical surface structure;
receiving a curved screen image to be detected and carrying out defect detection on the curved screen image;
and judging whether the curved screen to be detected needs to be removed or not according to the defect detection result.
The invention has the beneficial effects that: the front illuminating mirror is arranged between the object placing platform and the spectroscope, and the outgoing angle of the reflected light can be reduced through the convergent modulation effect of the front illuminating mirror on the reflected light after being reflected by the curved surface screen to be detected, so that the loss of spatial information of an upper edge point of the curved surface screen to be detected is avoided; furthermore, the front-mounted illuminating lens is used in both the illuminating light path and the imaging light path, so that the integration level of the curved screen defect detection device can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a conventional display screen defect detection system;
FIG. 2 is a schematic structural diagram of a curved panel defect detecting apparatus according to one or more embodiments of the present invention;
FIG. 3a is a schematic view of an illumination optical path of a front illumination mirror in a curved screen defect detecting device according to one or more embodiments of the present invention;
FIG. 3b is a schematic diagram of a reflected light path of a front illumination mirror reflected by a curved panel to be detected in a curved panel defect detection apparatus according to one or more embodiments of the present invention;
FIG. 4a is a schematic diagram illustrating the principle of scattering and modulating incident light by a curved panel to be detected when a conventional display screen defect detection system is used for detecting the curved panel;
FIG. 4b is a schematic diagram illustrating the converging modulation of incident light by a front illumination mirror in a curved panel defect detecting apparatus according to one or more embodiments of the present invention;
FIG. 5 is a schematic diagram illustrating the compensation of the exit angle of the reflected light from the front-end illuminator in a curved panel defect detecting apparatus according to one or more embodiments of the present invention;
fig. 6 is a schematic structural diagram of an object plane model of a curved screen to be detected in a curved screen defect detecting apparatus according to one or more embodiments of the present invention;
FIG. 7 is a flowchart of a curved screen defect detection method according to one or more embodiments of the invention;
illustration of the drawings:
the system comprises an imaging module, an imaging objective lens and a linear array camera, wherein the imaging module is 1-10-an imaging objective lens and 11-the linear array camera; 2-a spectroscope; 3-front lighting mirror, 30-first positive lens, 31-second positive lens; 4-an illumination collimator; 5-a light source module; 6-a placement platform; 7-a defect detection module; 8-curved screen to be detected; 9-control module.
Detailed Description
To make the objects, embodiments and advantages of the present invention clearer, exemplary embodiments of the present invention will be described more clearly and completely with reference to the accompanying drawings in exemplary embodiments of the present invention, and it is to be understood that the exemplary embodiments described are only a part of the embodiments of the present invention, and not all of the embodiments.
It should be noted that the brief descriptions of the terms in the present invention are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present invention. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.
The terms "first", "second", "third", and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between similar or analogous objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.
The terms "comprises," "comprising," "has," "having," "for" and any variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements expressly listed but may include other elements not expressly listed or inherent to such product or apparatus.
The terms "disposed," "connected," and "mounted" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The terms "module," "system," and the like are all components that can perform the corresponding steps of the present invention in accordance with the corresponding hardware configuration and software program.
The illumination mode of the light source module 5 can be divided into a bright field illumination mode and a dark field illumination mode; the bright field illumination system includes a coaxial illumination system and the like.
When the display screen defect detection system shown in fig. 1 is used for detecting the defects of the curved screen 8 to be detected, the imaging distance difference of different points on the curved screen 8 to be detected is large due to the small curvature radius of the curved screen 8 to be detected, and particularly, the imaging of the edge points of the curved screen is not clear for the existing display screen defect detection system, namely the small depth-of-field defect detection system.
Fig. 2 schematically illustrates a structural diagram of a curved-surface screen defect detecting apparatus according to an embodiment of the present invention.
In some embodiments, as shown in fig. 2, a curved panel defect detecting apparatus of the present invention includes: the device comprises an imaging module 1, a spectroscope 2, a front lighting mirror 3, a lighting collimating mirror 4, a light source module 5, an object placing platform 6 and a defect detection module 7;
the imaging module 1 is arranged on one side of the spectroscope 2, and the center of the imaging module 1 and the center of the spectroscope 2 are arranged on the same central axis in the horizontal direction;
the preposed illuminating mirror 3 is arranged at the other side of the spectroscope 2, the center of the preposed illuminating mirror 3 and the center of the spectroscope 2 are arranged on the same central axis in the horizontal direction, and the preposed illuminating mirror 3 is used for compensating the emergent angle of the light reflected by the curved screen 8 to be detected;
the center of the illumination collimating mirror 4 and the center of the spectroscope 2 are positioned on the same central axis in the vertical direction;
the light source module 5 is arranged on one side of the illumination collimating mirror 4 far away from the spectroscope 2, and the center of the light source module 5 and the center of the illumination collimating mirror 4 are positioned on the same central axis in the vertical direction;
the object placing platform 6 is arranged on one side, away from the spectroscope 2, of the front lighting mirror 3, the object placing platform 6 is used for placing the curved screen 8 to be detected, and the curved screen 8 to be detected is designed to be a curved cylindrical surface structure;
the defect detection module 7 is in communication connection with the imaging module 1, and the defect detection module 7 is used for performing defect detection on the curved screen image to be detected acquired by the imaging module 1 and outputting a detection result.
It should be noted that, in the above-mentioned scheme, the front illumination mirror 3 is added to compensate the exit angle of the light reflected by the curved screen 8 to be detected, so as to complete the process of matching the illumination pupil, and the illumination light beams emitted by the light source module 5 can be converged to the curved screen 8 to be detected to a certain extent, so as to adjust the exit angle of the reflected light of each point (including the edge point) on the curved screen 8 to be detected, so that the light beams carrying the spatial information of each point (including the edge point) on the curved screen 8 to be detected can be returned according to the original incident light path, thereby avoiding the loss of the spatial information of the edge point.
It should be noted that the front lighting mirror 3 in fig. 2 not only participates in the lighting process, but also serves as an imaging system, that is, the front structure of the imaging module 1 participates in the subsequent imaging process, and the light reflected by the curved screen 8 to be detected sequentially passes through the front lighting mirror 3 and the imaging module 1 for imaging. The two dashed lines in fig. 2 refer to the central axis in the horizontal direction and the central axis in the vertical direction, respectively.
Fig. 6 schematically illustrates an object plane model structure of a curved panel to be detected in the curved panel defect detecting apparatus according to an embodiment of the present invention.
As shown in fig. 6, the object plane of the curved screen 8 to be detected is designed to be a curved cylindrical structure, and specifically, the planar object plane of the curved screen 8 to be detected is changed into a curved cylindrical object plane by introducing a field curvature aberration in the light path design, so that the depth of field of the curved screen defect detection apparatus is increased to a certain extent.
In the scheme, the object plane of the curved screen 8 to be detected is designed into a curved cylindrical surface structure, so that the three-dimensional surface structure characteristics of the real 2.5D curved screen can be highly restored. The object plane directly restores the outline of the curved screen 8 to be detected, so that the difference of the working distance of each point on the curved screen 8 to be detected, which is caused by the fact that the object plane of the curved screen 8 to be detected is not a plane, is not required to be considered when the field depth range is considered, and only the change of the working distance, which is caused by the position deviation of each curved screen 8 to be detected on the detection production line, is required to be considered. The curved screen 8 to be detected is designed to be a curved cylindrical surface, the problem that the depth of field of the imaging objective lens is too small is solved to a certain extent, the aperture of the curved screen defect detection device can be properly increased, the luminous flux of the curved screen 8 to be detected is increased, and the minimum image space resolution of the curved screen defect detection device is increased.
Fig. 3a schematically shows an illumination optical path of a front illumination mirror 3 in a curved screen defect detection device according to an embodiment of the present invention.
Fig. 3b schematically shows a reflection light path of the front lighting mirror 3 after being reflected by the curved screen 8 to be detected in the curved screen defect detecting apparatus according to an embodiment of the present invention.
In some embodiments, as shown in fig. 3a and 3b, the front lighting mirror 3 is a positive lens group, and the front lighting mirror 3 includes a first positive lens 30 and a second positive lens 31;
wherein, the center of the first positive lens 30 and the center of the second positive lens 31 are arranged on the same central axis in the horizontal direction;
the first positive lens 30 is arranged on one side close to the object placing platform 6;
the second positive lens 31 is disposed on a side close to the dichroic mirror 2.
It should be particularly noted that, as can be seen from fig. 3a and 3b, the illumination light beam emitted by the light source module 5 is reflected onto the front illumination mirror 3 after passing through the dichroic mirror 2, and then passes through the first positive lens 30 of the front illumination mirror 3, and then passes through the second positive lens 31 to be converged onto the curved screen 8 to be detected, and the reflected light beams of each point (including the edge point) on the curved screen 8 to be detected after being reflected can all return to the front illumination mirror 3, so that the problem of spatial information loss of the edge point of the curved screen 8 to be detected can be effectively solved. In addition, the first positive lens 30 and the second positive lens 31 may both adopt a biconvex lens, a plano-convex lens or a meniscus lens, and the front illuminating mirror 3 in the drawings of the present invention is a schematic structural diagram, and does not represent the type of the positive lens group thereof, and specifically, which type of positive lens is adopted may be selected according to the actual scene, which is not limited by the present invention.
Fig. 4a exemplarily shows a schematic principle diagram of a curved panel 8 to be detected performing scattering modulation on incident light when an existing display screen defect detection system is used for detecting the curved panel.
Fig. 4b is a schematic diagram illustrating the principle of converging and modulating incident light by the front lighting mirror 3 in the curved screen defect detecting device according to an embodiment of the present invention.
As shown in fig. 4a, the curved screen 8 to be detected can be regarded as a convex reflector, and since the convex reflector can diffuse incident light, parallel light beams of the existing display screen defect detection system will be diffused after being reflected by the curved screen 8 to be detected, and reflected light carrying edge point space information cannot be received to the imaging module 1 for image acquisition, thereby causing edge point image information loss. However, as shown in fig. 4b, the front illumination mirror 3 with positive focal power is adopted in the present invention, so that the incident light emitted from the light source module 5 is converged and modulated by the front illumination mirror 3 and then is incident on the curved screen 8 to be detected, thereby reducing the exit angle of the reflected light reflected by the curved screen 8 to be detected and avoiding the loss of the edge point image information.
Fig. 5 schematically shows a schematic diagram of the exit angle compensation of the light reflected by the front lighting mirror 3 in the curved panel defect detecting apparatus according to an embodiment of the present invention.
As shown in fig. 5, when the image space focus of the front lighting mirror 3 coincides with the circle center (O in fig. 5 represents the circle center) corresponding to the curvature radius of the curved screen 8 to be detected, the lighting beam emitted by the light source module 5 passes through the front lighting mirror 3 and then is incident on the curved screen 8 to be detected. After the illuminating light beams with a certain angle are converged by the front illuminating lens 3, the included angle between the incident light rays irradiating each point on the curved screen 8 to be detected and the normal line of the point is also very small, so that the emergent angle of the reflected light rays of each point on the curved screen 8 to be detected can be reduced.
In some embodiments, the focal length of the front lighting mirror 3 is calculated according to the curvature radius of the curved screen 8 to be detected and the working distance, wherein the working distance is the distance between the front lighting mirror 3 and the curved screen 8 to be detected.
In some embodiments, the focal length of the front illumination mirror 3 is specifically calculated as follows:
f′＝L+R，
wherein f' represents the focal length of the front lighting mirror 3, L represents the working distance, i.e. the distance between the front lighting mirror 3 and the curved screen 8 to be detected, and R represents the curvature radius of the curved screen 8 to be detected.
It should be noted that, when the curvature radius of the curved screen 8 to be detected is R, if the focal length of the front illuminating mirror 3 is f ', the working distance between the front illuminating mirror 3 and the curved screen 8 to be detected should be kept at L ═ f' -R. According to the scheme, the front illuminating mirror 3 with different focal lengths and the corresponding working distance can be flexibly selected according to the curvature radius of the curved screen 8 to be detected, the illumination pupil matching is completed, the specific numerical values of the focal length or the working distance of the front illuminating mirror 3 can be combined with the practical application scene and obtained according to the calculation formula, and the focal length or the working distance of the front illuminating mirror 3 is not specifically limited.
In some embodiments, as shown in fig. 2, the imaging module 1 comprises an imaging objective 10 and a line camera 11;
the imaging objective lens 10 and the linear array camera 11 are detachably connected;
the imaging objective 10 is arranged on the side close to the beam splitter 2.
In order to make the reflected light reflected by the upper edge point of the curved screen 8 to be detected received by the subsequent imaging module 1 as much as possible, the light condensing capability of the front illuminating mirror 3 should be close to the light diffusing capability of the curved screen 8 to be detected, i.e. the focal length of the front illuminating mirror 3 should be close to the curvature radius of the curved screen 8 to be detected. However, when the above conditions are met, the working distance L between the front lighting mirror 3 and the curved screen 8 to be detected is very small, and the reflected light reflected by the edge point on the curved screen 8 to be detected will pass through the front lighting mirror 3 and the subsequent imaging module 10 in sequence, so that the front lighting mirror 3 in the invention participates in both the modulation of the lighting optical path in the early stage and the imaging optical path in the later stage.
In addition, because the defect detection of the curved screen is generally in assembly line work, the distance between each curved screen 8 to be detected and the defect detection device of the curved screen can be changed within a certain range; moreover, because the curvature of the curved screen 8 to be detected is large, the distances between different points on the curved screen 8 to be detected and the curved screen defect detection device are different. Therefore, the imaging objective 10 in the subsequent imaging module 1 needs to have a certain depth of field.
In some embodiments, the depth of field calculation formula of the imaging objective 10 is as follows;
wherein, Δ L represents the depth of field of the imaging objective lens 10, F represents the number of image sides of the imaging objective lens 10, δ represents the minimum image side resolution of the line camera 11, F' represents the focal length of the front lighting mirror 3, and L represents the working distance, i.e. the distance between the front lighting mirror 3 and the curved screen 8 to be detected.
In some embodiments, the minimum image-space resolution of the curved-surface screen defect detection device is calculated according to the following formula:
δ min ＝1.22λF，
wherein, delta min The minimum image space resolution of the curved screen defect detection device is shown, λ represents the wavelength of the illumination light source in the light source module 5, and F represents the image space number of the imaging objective lens 10.
Assuming that the system magnification of the imaging objective 10 is β, the minimum resolution required for the curved screen 8 to be examined, i.e. the object-side resolution, is δ 0 The calculation formula of the minimum image-space resolution δ required by the line camera 11 is as follows:
δ＝δ 0 ×β。
in addition, the system magnification of the imaging objective lens 10 can be calculated according to the size of the detection surface of the line camera 11 and the size of the curved screen 8 to be detected; or according to the focal length of the front lighting mirror 3 and the image space number of the imaging objective lens 10, the specific formula is as follows:
wherein, β represents the system magnification of the imaging objective lens 10, y 'represents the size of the detection surface of the linear array camera 11, y represents the size of the curved screen 8 to be detected, f' represents the focal length of the front lighting mirror 3, and L represents the working distance, i.e. the distance between the front lighting mirror 3 and the curved screen 8 to be detected.
In some embodiments, the depth of field of the imaging objective 10 and the minimum image resolution of the curved screen defect detection apparatus are inversely related to each other according to the above calculation formula.
In some embodiments, as shown in fig. 2, the curved panel defect detecting apparatus further includes a control module 9, where the control module 9 is in communication connection with the light source module 5, the imaging module 1, and the defect detecting module 7, respectively;
wherein the control module 9 is configured to:
when the light source module 5 is turned on, the imaging module 1 is controlled to collect a curved screen image to be detected, wherein the curved screen image to be detected comprises spatial information of all points on the curved screen 8 to be detected;
controlling a defect detection module 7 to perform defect detection on the curved screen image to be detected;
and judging whether the curved screen 8 to be detected needs to be removed or not according to the defect detection result.
It should be noted that, in the present invention, the defect detection module 7 and the control module 9 are both disposed on the same server (not shown in the figure), and are distinguished only according to their functions.
In addition, in all the drawings of the present invention, except for specific marks and descriptions, lines with arrows represent incident light or reflected light, and particularly, refer to the optical path direction, the imaging direction or the corresponding marks in the respective drawings, and therefore, the lines with arrows in the drawings mainly mean that the incident light or the reflected light does not obscure the aspects of the present invention.
Fig. 7 is a flowchart illustrating a curved screen defect detection method according to another embodiment of the present invention.
In other embodiments, as shown in fig. 7, a curved panel defect detecting method according to an embodiment of the present invention is implemented by a curved panel defect detecting apparatus, and includes the following steps:
100, controlling the light source module 5 to be turned on;
101, when the light source module 5 is turned on, controlling the imaging module 1 to collect a curved screen image to be detected, wherein the curved screen image to be detected comprises spatial information of all points on the curved screen 8 to be detected, and the curved screen 8 to be detected is designed to be a curved cylindrical surface structure;
102, receiving a curved screen image to be detected and carrying out defect detection on the curved screen image;
103, judging whether the curved screen 8 to be detected needs to be removed or not according to the defect detection result.
It should be noted that, in the present invention, the process of detecting defects of the curved screen image to be detected is the same as the detection process in the prior art, and the removing process is also the same as the removing process in the prior art, which is not described herein again. In addition, the invention does not limit the manufacturing material of the curved screen 8 to be detected, and the defect detection scheme of the invention can be suitable for any curved surface manufactured by one or more of various materials such as glass, crystal, metal or plastic.
According to the invention, the prepositive illumination mirror 3 is arranged between the storage platform 6 and the spectroscope 2, and the outgoing angle of the reflected light can be reduced by the convergent modulation effect of the prepositive illumination mirror 3 on the reflected light after being reflected by the curved screen 8 to be detected, so that the loss of the spatial information of the upper edge point of the curved screen 8 to be detected is avoided; further, the front-mounted illuminating lens 3 is used in both the illuminating light path and the imaging light path, so that the integration level of the curved screen defect detection device can be improved.
The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the foregoing discussion in some embodiments is not intended to be exhaustive or to limit the implementations to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. The utility model provides a curved surface screen defect detecting device which characterized in that includes: the device comprises an imaging module, a spectroscope, a front lighting mirror, a lighting collimating mirror, a light source module, a storage platform and a defect detection module;
the imaging module is arranged on one side of the spectroscope, and the center of the imaging module and the center of the spectroscope are arranged on the same central axis in the horizontal direction;
the front illuminating mirror is arranged on the other side of the spectroscope, the center of the front illuminating mirror and the center of the spectroscope are arranged on the same central axis in the horizontal direction, and the front illuminating mirror is used for compensating the emergent angle of the light rays reflected by the curved screen to be detected;
the center of the illumination collimating mirror and the center of the spectroscope are positioned on the same central axis in the vertical direction;
the light source module is arranged on one side of the illumination collimating mirror, which is far away from the spectroscope, and the center of the light source module and the center of the illumination collimating mirror are positioned on the same central axis in the vertical direction;
the object placing platform is arranged on one side, away from the spectroscope, of the front lighting mirror, and is used for placing the curved screen to be detected, and the curved screen to be detected is designed to be a curved cylindrical surface structure;
the defect detection module is in communication connection with the imaging module and is used for performing defect detection on the curved screen image to be detected acquired by the imaging module and outputting a detection result.
2. The curved screen defect detecting device of claim 1, wherein the front lighting mirror comprises a first positive lens and a second positive lens;
wherein the center of the first positive lens and the center of the second positive lens are arranged on the same central axis in the horizontal direction;
the first positive lens is arranged on one side close to the object placing platform;
the second positive lens is arranged on one side close to the spectroscope.
3. The curved screen defect detecting device according to claim 2, wherein the focal length of the front lighting mirror is calculated according to the radius of curvature of the curved screen to be detected and a working distance, wherein the working distance is the distance between the front lighting mirror and the curved screen to be detected.
4. The curved screen defect detecting device according to claim 3, wherein the focal length of the front lighting mirror is calculated by the following formula:
f′＝L+R，
wherein f' represents the focal length of the front lighting mirror, L represents the working distance, and R represents the curvature radius of the curved screen to be detected.
5. The curved screen defect detecting device of claim 1, wherein the imaging module comprises an imaging objective lens and a line camera;
the imaging objective lens is connected with the linear array camera;
the imaging objective lens is arranged on one side close to the spectroscope.
6. The curved screen defect detecting device of claim 5, wherein the depth of field of the imaging objective lens is calculated as follows:
wherein, Δ L represents the depth of field of the imaging objective lens, F represents the image space number of the imaging objective lens, δ represents the minimum image space resolution of the linear array camera, F represents the focal length of the front lighting mirror, and L represents the working distance.
7. The curved screen defect detecting device of any one of claims 1 to 6, wherein the depth of field of the imaging objective lens is inversely related to the minimum image resolution of the curved screen defect detecting device.
8. The curved screen defect detecting device according to claim 7, wherein the minimum image-space resolution of the curved screen defect detecting device is calculated as follows:
δ min ＝1.22λF，
wherein, delta min The minimum image space resolution of the curved screen defect detection device is represented, lambda represents the wavelength of an illumination light source in the light source module, and F represents the image space number of the imaging objective lens.
9. The curved screen defect detection device of claim 1, further comprising a control module, wherein the control module is in communication connection with the light source module, the imaging module and the defect detection module respectively;
wherein the control module is configured to:
controlling the imaging module to collect a curved screen image to be detected when the light source module is turned on, wherein the curved screen image to be detected comprises spatial information of all points on the curved screen to be detected;
controlling the defect detection module to carry out defect detection on the curved screen image to be detected;
and judging whether the curved screen to be detected needs to be removed or not according to a defect detection result.
10. A curved panel defect detecting method applied to the curved panel defect detecting apparatus according to any one of claims 1 to 9, the curved panel defect detecting method comprising:
controlling the light source module to be turned on;
when the light source module is turned on, controlling an imaging module to acquire a curved screen image to be detected, wherein the curved screen image to be detected comprises spatial information of all points on the curved screen to be detected, and the curved screen to be detected is designed to be a curved cylindrical surface structure;
receiving the curved screen image to be detected and carrying out defect detection on the curved screen image to be detected;
and judging whether the curved screen to be detected needs to be removed or not according to a defect detection result.
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| CN115546111B (en) * | 2022-09-13 | 2023-12-05 | 武汉海微科技有限公司 | Curved surface screen detection method, device, equipment and storage medium |
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