Detection device and detection method

Abstract

This invention discloses a detection device and a detection method. The detection device, used to detect the thickness of an object at a recess, includes: a holding portion that holds the object with the recess facing upwards; a contact detector disposed above the holding portion; and a spherical body held within the recess of the object. When the detector and the holding portion approach each other in a vertical direction, the detector can abut the top of the spherical body. According to the detection device of this invention, the dependence on the positioning accuracy of the object can be reduced while improving the accuracy of thickness detection.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of lens manufacturing equipment technology, and particularly to testing devices and testing methods. Background Technology

[0002] In the prior art, there are detection devices that use contact detectors (such as thickness gauges) to detect the thickness of objects such as lenses. When detecting concave surfaces, for example, the object needs to be precisely positioned to ensure that the detector contacts the thinnest part of the object. During this process, positioning errors of the object (such as lenses) or offset of the object can affect the detector's thickness measurement results. Summary of the Invention

[0003] This invention aims to at least partially address one of the problems in the prior art. To this end, this invention proposes a detection device that can reduce reliance on the positioning accuracy of the object being detected while improving the accuracy of thickness detection. Furthermore, this invention also proposes a detection method for detecting the thickness of the object being detected.

[0004] According to a first aspect of the present invention, a detection apparatus for detecting the thickness of a test object at a recess includes: a holding portion for holding the test object with the recess facing upwards; a contact detector disposed above the holding portion; and a spherical body held in the recess of the test object; wherein the detector may abut the top of the spherical body when the detector and the holding portion approach each other in a vertical direction.

[0005] The detection apparatus according to the first aspect of the present invention has the following advantages: it can reduce the dependence on the positioning accuracy of the object being detected while improving the detection accuracy of the thickness of the object being detected.

[0006] In some embodiments, the retaining portion has a retaining surface for retaining the bottom of the object being detected, the retaining surface being planar.

[0007] In some embodiments, when the bottom of the recess is arc-shaped, the diameter of the sphere is smaller than the diameter of the arc-shaped surface in the bottom of the recess that holds the position of the sphere.

[0008] In some embodiments, the absolute value of the sphericity of the sphere is less than 1 / 5 of the absolute value of the detection accuracy of the detector.

[0009] In some embodiments, the hardness of the material of the sphere is greater than the hardness of the object being tested.

[0010] In some embodiments, the detector is disposed directly above the retaining portion, and the detection end of the detector can be driven in the vertical direction relative to the retaining portion.

[0011] In some embodiments, the detector is equipped with a drive unit for driving the detection end to extend or retract.

[0012] In some embodiments, the surface of the detection end is planar.

[0013] In some embodiments, a conveying unit is further included, which conveys the sphere to the recess or transfers the sphere from the recess.

[0014] In some embodiments, a positioning unit is further included, which is configured to position the object to be detected before it is held by the holding unit.

[0015] In some embodiments, the positioning part includes a pair of positioning jaws that hold the object to be detected from the side, and there is a gap between the positioning jaws and the side of the object to be detected.

[0016] According to a second aspect of the present invention, a detection method for detecting the thickness of a test object at a recess includes the following steps: a holding step, holding the test object with the recess facing upwards; a conveying step, conveying a spherical body to the recess of the test object; and a detection step, causing a contact detector to abut against the spherical body in a vertical direction.

[0017] The detection method according to the second aspect of the present invention has the following beneficial effects: it can reduce the dependence on the positioning accuracy of the object being detected while improving the detection accuracy of the thickness of the object being detected.

[0018] In some embodiments, a positioning step is further included, which positions the object to be detected in a horizontal direction.

[0019] In some embodiments, the detection step is performed multiple times.

[0020] In some embodiments, after the conveying step, a correction step is further included to cause the sphere to vibrate within the recess.

[0021] In some embodiments, a correction step is further included, in which the sphere vibrates within the recess; the correction step is performed multiple times, and the correction step and the detection step are performed alternately. Attached Figure Description

[0022] Figure 1 This is a perspective view of an embodiment of the detection device of the first aspect of the present invention.

[0023] Figure 2 yes Figure 1 The front view of the detection device in the image.

[0024] Figure 3 yes Figure 2 A magnified view of point A in the image.

[0025] Figure 4 This is a schematic diagram of another embodiment of the detection device of the first aspect of the present invention.

[0026] Figure 5 This is a cross-sectional view of one embodiment of the object being inspected.

[0027] Figure 6 This is a cross-sectional view of another embodiment of the object being inspected.

[0028] Figure 7 This is a flowchart of an embodiment of the detection method of the second aspect of the present invention.

[0029] Figure 8 This is a flowchart of another embodiment of the detection method.

[0030] Figure 9 This is a flowchart of another embodiment of the detection method.

[0031] Figure 10 This is a flowchart of another embodiment of the detection method. Detailed Implementation

[0032] The embodiments of this implementation are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this implementation, and should not be construed as limiting this implementation.

[0033] In the description of this embodiment, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this embodiment.

[0034] In the description of this embodiment, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this embodiment, unless otherwise explicitly limited, terms such as setting, installing, and connecting should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this embodiment in conjunction with the specific content of the technical solution.

[0036] Figure 5 , Figure 6 These are cross-sectional views of one embodiment of the object to be detected 200. In the following description, the object to be detected 200 will be described using a lens 202 as an example. Examples of lenses 202 include lenses with an arc-shaped bottom and lenses with a flat bottom.

[0037] Figure 1 This is a 3D view of the detection device 100. Figure 2 This is the front view of the detection device 100. Figure 3 yes Figure 2 A magnified view of point A in the image. Furthermore, it should be noted that... Figure 2 , Figure 3 For ease of illustration, the object being tested, 200, is cut open.

[0038] Reference Figures 1 to 3 The detection apparatus 100 according to this embodiment is used to detect the thickness of the object to be detected 200 at the recess 201. The detection apparatus 100 of this embodiment includes: a holding part 101, a contact detector 102, and a spherical body 103. The holding part 101 holds the object to be detected 200 with the recess 201 facing upwards. The contact detector 102 is disposed above the holding part 101. The spherical body 103 is held in the recess 201 of the object to be detected 200. When the detector 102 and the holding part 101 approach each other in the vertical direction, the detector 102 can abut against the spherical body 103.

[0039] The detection apparatus 100 according to this embodiment can reduce the dependence on the positioning accuracy of the object 200 being detected while improving the detection accuracy of the thickness of the object 200. Specifically, for some objects 200, such as optical lenses 202, their thickness affects imaging accuracy, refraction accuracy, reflection accuracy, etc., therefore, the processing accuracy requirements for the thickness of optical lenses 202 are becoming increasingly stringent. Furthermore, after processing, it is still necessary to detect the thickness of the thinnest part of these optical lenses 202 and remove defective products with unacceptable thickness.

[0040] For lens 202, the thinnest point is, for example, at the center. In the prior art, to ensure that the contact point of the contact detector 102 is at the thinnest point of lens 202, it is usually necessary to accurately position lens 202 before measuring the thickness of the thinnest point. That is, the machining accuracy and adjustment accuracy of the fixtures used to position lens 202 will affect the accuracy of the thickness measurement of lens 202. In view of this, in the detection device 100 of this embodiment, by adding a spherical body 103 and holding the spherical body 103 in the recess 201 of lens 202, which is the object to be detected, the spherical body 103 adapts itself in the recess 201 due to gravity and is held at the thinnest point of the recess 201. With the sphere 103 stably held, by bringing the detector 102 abutting against the top of the sphere 103 (upper part in the figure), it is possible to detect, for example, the distance S1 from the surface of the bottom of the lens 202 (lower part in the figure) to the top of the sphere 103. Furthermore, the sphere 103 can be, for example, a standard sphere of known size, with the standard size of the sphere 103 being, for example, D1 (diameter), and then, for example, the thickness S2 of the recess 201 of the lens 202 can be obtained as S1 - D1.

[0041] That is, with the detection device 100 of this embodiment, the thickness of the required detection position of the recess 201 of the object 200 can be accurately determined without high-precision positioning of the object 200, such as the lens 202, and without deviation. Therefore, the dependence on the positioning accuracy of the object 200 can be reduced while improving the detection accuracy of the thickness of the object 200.

[0042] Furthermore, in the above and following descriptions, the vertical direction refers to a direction that is approximately parallel to the vertical direction. The detection apparatus 100 of this embodiment, for example, detects the thinnest thickness of the object to be detected 200, that is, the thickness between the bottom of the object to be detected 200 and the bottom of the recess 201. Therefore, the holding portion 101 can hold the object to be detected 200 approximately horizontally with the recess 201 facing upwards. This reduces the difficulty of detection.

[0043] Continue to refer to Figure 1 , Figure 2 The detection device 100 of this embodiment can be used as a standalone detection device or assembled into equipment as a component of the equipment. For example, the detection device 100 can be mounted in a lens manufacturing equipment 300. The detection device 100 of this embodiment may include a mounting base 104, which is mounted on the base 301 of the lens manufacturing equipment 300, for example. The mounting base 104 can be integrally formed with a lower mounting stage 105 and an upper mounting stage 106 by, for example, CNC machining. The lower mounting stage 105 is parallel to the upper mounting stage 106. By integrally forming the lower mounting stage 105 and the upper mounting stage 106 on the mounting base 104, the machining accuracy of the lower mounting stage 105 and the upper mounting stage 106 can be improved. For example, the parallelism between the mounting surface of the lower mounting stage 105 and the mounting surface of the upper mounting stage 106 can be improved.

[0044] Continue to refer to Figure 3 and supplementary reference Figure 1 , Figure 2 In some embodiments, the retaining part 101 has a retaining surface 107 for retaining the bottom of the object to be tested 200, and the retaining surface 107 is planar. Specifically, the retaining part 101 is disposed on the lower mounting platform 105. The retaining part 101 may include, for example, a retaining seat 108, with a columnar protrusion 109 provided in the middle of the retaining seat 108, and the retaining surface 107 disposed at the upper end of the protrusion 109. The retaining surface 107 is parallel to the mounting surface of the lower mounting platform 105. The area of ​​the retaining surface 107 is not particularly limited as long as it can reliably retain the object to be tested 200. For example, the bottom surface of the object to be tested 200 is planar (see reference). Figure 6 ), or in an outward-protruding arc shape (see reference). Figure 5 In this case, the area of ​​the holding surface 107 can be larger than the area of ​​the bottom surface of the object to be detected 200, and the holding surface 107 supports the bottom surface of the object to be detected 200 as a whole. In the detection device 100 of this embodiment, since it is not necessary to precisely position the object to be detected 200 in the horizontal direction, the holding part 101 only needs to be able to horizontally and reliably support the object to be detected 200. Therefore, not only can the object to be detected 200 be easily held, but there is also no need to perform complex assembly and adjustment work on the holding seat 108 of the holding part 101.

[0045] In some embodiments, when the bottom of the recess 201 of the object to be detected 200 is arc-shaped, the diameter D1 of the sphere 103 is smaller than the diameter D2 of the arc-shaped surface in the bottom of the recess 201 that holds the position of the sphere 103. Specifically, the arc shape of the recess 201 of the object to be detected 200 varies depending on the type of the object to be detected 200. For example, the arc shape of the recess 201 of the object to be detected 200 can be spherical or aspherical. Examples of spherical arc shapes include, for example, elliptical surfaces, parabolic surfaces, hyperboloids, and arc surfaces composed of multiple arc segments. The diameter D1 of the sphere 103 is smaller than the diameter D2 of the arc surface at the thinnest position in the bottom of the recess 201, so that the sphere 103 can be supported by the bottom of the arc surface at the thinnest position of the object to be detected 200. Therefore, when the detector 102 detects the distance between the top of the sphere 103 and the reference surface (holding surface 107), this distance is the sum of the standard diameter D1 of the sphere 103 and the thickness S2 of the thinnest position of the object being detected 200.

[0046] The diameter D1 of the sphere 103 only needs to be smaller than the diameter D2 of the bottom of the recess 201. However, in order to prevent the sphere 103 from impacting other sides of the recess 201 when it is held in the recess 201, the diameter D1 of the sphere 103 is, for example, less than 0.95 times the diameter D2 of the bottom of the recess 201, i.e., D1 / D2≤0.95. By making the diameter D1 of the sphere 103 less than 0.95 times the diameter D2 of the bottom of the recess 201, it is easier for the sphere 103 to adaptively roll to the bottom of the recess 201 of the object to be detected by gravity. In addition, there is still space between the bottom of the recess 201 of the object to be detected and the sphere 103 to allow the sphere 103 to adaptively adjust, thereby preventing the sphere 103 from getting stuck because the object to be detected is not held in a horizontal position with high precision. Furthermore, to suppress excessive vibration of the sphere 103, the diameter D1 of the sphere 103 is, for example, more than 0.5 times the diameter D2 of the bottom of the recess 201, i.e., D1 / D2 ≥ 0.50. Specifically, when the diameter D1 of the sphere 103 is too small relative to the diameter D2 of the arc surface at the bottom of the recess 201, the arc surface at the bottom of the recess 201 may be approximately planar relative to the sphere 103. If the object being detected is not kept in a horizontal position with high precision, the sphere 103 may roll relative to the arc surface at the bottom of the recess 201 of the object being detected, causing the sphere 103 to not stop at the thinnest position at the bottom of the recess 201 of the object being detected, thus leading to detection error. Therefore, by making the diameter D1 of the sphere 103 more than 0.5 times the diameter D2 of the bottom of the recess 201, the increase in detection error due to the positioning error of the object being detected can be further reduced.

[0047] Furthermore, when the spherical body 103 is held at the bottom of the recess 201 of the object to be detected 200, the spherical body 103 can be completely contained within the recess 201, or its top can protrude from the upper surface of the object to be detected 200. To prevent interference between the detection end 110 of the detector 102 and the object to be detected 200, when the spherical body 103 is completely contained within the recess 201, the surface of the detection end 110 of the detector 102 can be approximately the same as, or smaller than, the diameter of the spherical body 103. Thus, even if the object to be detected 200 is not precisely positioned in the horizontal direction, the detection end 110 of the detector 102 can accurately extend into the recess 201 of the object to be detected 200, preventing interference between the detection end 110 of the detector 102 and the object to be detected 200. Furthermore, when the top of the sphere 103 protrudes above the upper surface of the object to be detected 200, the surface of the detection end 110 of the detector 102 can be slightly smaller than or larger than the diameter of the sphere 103, depending on the actual needs.

[0048] The detector 102 can be a commercially available contact displacement sensor. The detector 102 is positioned directly above the holding portion 101, and the detection end 110 of the detector 102 is driveable vertically relative to the holding portion 101. The type of detector 102 is not particularly limited; it can be appropriately selected based on the required detection accuracy or contact pressure range of the object being detected 200. For example, the detector 102 can be a detector with a detection accuracy in the range of 1 μm to 5 μm. For example, the detector 102 can be a detector with a measuring force in the range of 0.4 N to 4 N. Furthermore, the detector 102 can be a detector equipped with a drive unit 111 for driving the extension and retraction of the detection end 110. For example, the detector 102 can be a contact displacement sensor equipped with, for example, a pneumatically driven type or a motor-driven type for driving the extension and retraction of the detection end 110. This improves the detection accuracy of the detector 102, avoids assembly errors caused by installing an external drive device, and makes the overall structure of the detection device 100 more compact. For example, the detector 102 can be directly installed on the upper mounting platform 106 of the mounting base 104.

[0049] Furthermore, to facilitate easy contact between the detector 102 and the top of the sphere 103, the surface of the detection end 110 of the detector 102 is planar. Specifically, the detector 102 can be either a commercially available detector 102 with a planar surface at its detection end 110, or a detection sleeve 112 with a re-machined planar surface can be installed on the detection end 110 of the detector 102 according to actual needs. Thus, even if the object 200 or the sphere 103 is not perfectly centered in the vertical direction, the detection end 110 of the detector 102 can accurately contact the top of the sphere 103, thereby further reducing the dependence on the positioning accuracy of the object 200 and the installation accuracy of the detector 102.

[0050] In some embodiments, to further improve the detection accuracy of the thickness of the object 200, the absolute value of the sphericity of the sphere 103 is less than 1 / 5 of the absolute value of the detection accuracy of the detector 102. For example, when the detection accuracy of the detector 102 is ±1 μm, the error of the sphericity of the sphere 103 can be selected to be ±0.2 μm; when the detection accuracy of the detector 102 is ±5 μm, the error of the sphericity of the sphere can be selected to be ±1 μm. This reduces the impact of the error of the standard sphere on the detection accuracy of the detector 102, further improving the detection accuracy of the thickness of the object 200. Furthermore, when higher detection accuracy is required, preferably, the absolute value of the sphericity of the sphere 103 is less than 1 / 10 of the absolute value of the detection accuracy of the detector 102.

[0051] Furthermore, the hardness of the material of the sphere 103 is greater than the hardness of the test object 200. Since the sphere 103 may be recycled, the material of the sphere 103 can be, for example, an ultra-hard material with high wear resistance. Examples of materials that can be selected for the sphere 103 include: ceramics, stainless steel, bearing steel, carbon steel, etc. The sphere 103 can also be a commercially available steel ball, standard ball, or other spherical object.

[0052] Continue to refer to Figure 1 , Figure 2In some embodiments, the detection apparatus 100 of this embodiment may further include a conveying unit 113, which conveys the spherical body 103 to the recess 201 or transfers the spherical body 103 from the recess 201. The conveying unit 113 may be provided on the mounting base 104, or it may be provided on the base 301 of the lens manufacturing equipment 300 via a bracket 114. The conveying unit 113 may include a conveying cylinder 115, which is mounted on the mounting base 104. The end of the conveying cylinder 115 (the extended end of the piston rod) may be equipped with a vacuum suction cup 116 for adsorbing the spherical body 103. Before detecting the lens 202, which is the object to be detected 200, the spherical body 103 is adsorbed on the vacuum suction cup 116. When detection is required, the spherical body 103 is conveyed to the recess 201 of the lens 202 via the conveying cylinder 115. After the lens 202 is inspected, the sphere 103 is once again attracted by the vacuum chuck 116 and transferred from the recess 201 by the transfer cylinder 115. When the sphere 103 is not needed, it can be stably held by the vacuum chuck 116. Thus, the transfer or transport of the sphere 103 can be easily achieved.

[0053] Figure 4 This is a schematic diagram of another embodiment of the detection device 100. (Refer to...) Figure 4 In some embodiments, the detection device 100 of this embodiment may further include a positioning part 117, which is configured to position the object 200 before it is held in the holding part 101. The positioning part 117 may include, for example, a pair of positioning grippers 118a and 118b. The mounting position of the positioning grippers 118a and 118b is not particularly limited; for example, they may be mounted on the base 301, on the mounting base 104, or on a handling device (not shown) such as a turntable or a handling robot for handling the object 200. Furthermore, the method of opening or closing the positioning grippers 118a and 118b is not particularly limited; for example, they may be opened or closed by a gripping cylinder or a motor.

[0054] Before the object to be detected 200 is held on the holding surface 107 of the holding part 101, the positioning jaws 118a and 118b grip the object to be detected 200, so that the object to be detected 200 is coarsely positioned relative to the holding surface 107 in the horizontal direction. After the object to be detected 200 is coarsely positioned, the positioning jaws 118a and 118b can be driven to descend by, for example, a cylinder, so that the object to be detected 200 is lowered and held on the holding surface 107. As a result, the object to be detected 200 can be placed within the detection range of the detector 102.

[0055] Furthermore, when the bottom of the object to be tested 200 is arc-shaped, after the holding surface 107 of the holding part 101 supports the bottom of the object to be tested 200, the object to be tested 200 can swing slightly relative to the holding surface 107 of the holding part 101. In this case, the positioning jaws 118a and 118b hold the object to be tested 200 from the side of the object to be tested 200. Moreover, there is a gap between the pair of positioning jaws 118a and 118b and the side of the object to be tested 200, that is, the clamping distance between the pair of positioning jaws 118a and 118b is set to be slightly greater than the radial distance of the object to be tested 200, so that the recess 201 of the object to be tested 200 is always kept upward, while allowing the object to be tested 200 to float slightly relative to the pair of positioning jaws 118a and 118b.

[0056] With the spherical object 103 held in the recess 201, when the detection end 110 of the detector 102 abuts against the spherical object 103, the object 200, which is tilted relative to the holding surface 107, will automatically change from a tilted state to a roughly horizontal state due to the measuring force from the detector 102 directly above it. This further reduces the dependence on the positioning accuracy of the object 200 and the installation accuracy of the detector 102, while improving the accuracy of the thickness detection of the object 200.

[0057] Figures 7 to 10 These are flowcharts of various embodiments of the detection method of the present invention. It should be noted that, in Figures 7 to 10 The flowchart only illustrates some of the steps. For example, after detection step S403 and before the end, the detection results need to be processed. Since these processing procedures are not described in detail in the following embodiments, they are not included in the flowchart here.

[0058] Reference Figure 7 The following describes a detection method for detecting the thickness of a test object 200 at a recess 201 using the detection apparatus 100 based on the embodiments described above. Specifically, the detection method includes a holding step S401, a conveying step S402, and a detection step S403. In the holding step S401, the test object 200 is held with the recess 201 facing upwards. In the conveying step S402, a spherical body 103 is conveyed to the recess 201 of the test object 200. In the detection step S403, a contact detector 102 is brought into contact with the spherical body 103 in the vertical direction.

[0059] Reference Figure 8In the holding step S401, the object to be detected 200 is held approximately horizontally by the holding part 101. Furthermore, the holding step S401 may also include a positioning step S404, in which the object to be detected 200 is positioned horizontally. Before the object to be detected 200 is held on the holding surface 107 of the holding part 101, the object to be detected 200 is gripped by a pair of positioning jaws 118a and 118b of the positioning part 117, thereby positioning the object to be detected 200 horizontally relative to the holding surface 107. Moreover, the pair of positioning jaws 118a and 118b hold the object to be detected 200 from its side in a manner that allows the object to be detected 200 to float slightly.

[0060] Reference Figure 9 In some embodiments, to improve detection accuracy, detection step S403 can be executed multiple times. For example, if a detection value other than the set value occurs when detector 102 performs a single detection, detection step S403 can be executed multiple times to correct the detection value by finding the minimum value, etc.

[0061] Reference Figure 10 In some embodiments, to improve detection accuracy, a correction step S405 may be included after the transport step S402. In the correction step S405, the spherical body 103 is vibrated within the recess 201. The correction step S405 can be performed after one detection step S403 is executed. For example, if a detection value other than the set value occurs during a detection by the detector 102, the correction step S405 is executed, and after the spherical body 103 vibrates within the recess 201 and comes to rest, the detection step S403 is re-executed. Thus, after adjusting the spherical body 103, the detection value is corrected by finding the minimum detection value. The method of vibrating the spherical body 103 is not particularly limited. For example, the spherical body 103 can be vibrated within the recess 201 by the vacuum suction cup 116 of the transport section 113 striking the spherical body 103 when the vacuum suction cup 116 is not working. Alternatively, the detection end 110 can be driven by the drive unit 111 of the detector 102 to strike the spherical body 103, thereby causing the spherical body 103 to vibrate within the recess 201.

[0062] Furthermore, both the calibration step S405 and the detection step S403 can be executed multiple times. Moreover, the calibration step S405 and the detection step S403 are executed alternately. Therefore, each detection step S403 is performed independently after the position of the sphere 103 has been readjusted, ensuring that each detection value is independent. By minimizing these independent detection values, the detection accuracy can be further improved.

[0063] Other embodiments

[0064] In the above embodiments, although lens 202 was used as an example to describe the object 200 to be detected, the object 200 to be detected is not limited to lens 202, but may include other chips, circuit boards, etc.

[0065] In the above embodiment, although the example described is that the detector 102 is equipped with a drive unit 111 for driving the extension and retraction of the detection end 110, it is not limited to this. For example, the detection device 100 may also use a drive element such as a linear motor to drive the holding part 101 to rise relative to the detector 102, or drive the detector 102 to fall relative to the holding part 101, depending on the requirements of detection accuracy.

[0066] In the above embodiment, although the case where the bottom of the recess 201 is arc-shaped was described as an example, the bottom of the recess 201 may also be flat.

[0067] In the above embodiment, although the example described is that the ball 103 is transported to or transferred from the recess 201 by the conveying unit 113, it is not limited to this. For example, the ball 103 may be placed in the recess 201 while the object to be detected 200 is being fed, and may be transferred while the object to be detected 200 is being unloaded.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this implementation. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of this implementation have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this implementation, the scope of which is defined by the claims and their equivalents.

Claims

1. A detection device for detecting the thickness of an object at a recess, wherein, The bottom of the recess is arc-shaped, characterized in that it includes: A retaining portion is provided to hold the object to be detected with the recess facing upwards. A contact-type detector is disposed above the holding part; A sphere, an independent component relative to the detector, is adaptively held in the bottom of the recess of the object being detected by its own gravity, and the diameter of the sphere is smaller than the diameter of the arcuate surface in the bottom of the recess that holds the sphere in place. The correction module causes the spherical body to vibrate within the recess; When the detector and the retaining part approach each other in the vertical direction, the detector can abut the top of the sphere.

2. The detection device according to claim 1, characterized in that, The retaining part has a retaining surface for retaining the bottom of the object being tested, and the retaining surface is planar.

3. The detection device according to claim 1 or 2, characterized in that, The absolute value of the sphericity of the sphere is less than 1 / 5 of the absolute value of the detection accuracy of the detector.

4. The detection device according to claim 3, characterized in that, The hardness of the material of the sphere is greater than the hardness of the object being tested.

5. The detection device according to claim 1, characterized in that, The detector is positioned directly above the holding part, and the detection end of the detector can be driven in the vertical direction relative to the holding part.

6. The detection device according to claim 5, characterized in that, The detector is equipped with a drive unit for driving the extension and retraction of the detection end.

7. The detection device according to claim 5 or 6, characterized in that, The surface of the detection end is planar.

8. The detection device according to claim 1, characterized in that, It also includes a conveying unit that conveys the sphere to the recess or transfers the sphere from the recess.

9. The detection device according to claim 1, characterized in that, It also includes a positioning unit, which is configured to position the object to be detected before it is held by the holding unit.

10. The detection device according to claim 9, characterized in that, The positioning part includes a pair of positioning jaws that hold the object to be detected from the side, and there is a gap between the positioning jaws and the side of the object to be detected.

11. A detection method for detecting the thickness of a recess in an object to be tested, characterized in that, Includes the following steps: The detection object is held with the recess facing upwards, wherein the bottom of the recess is arc-shaped; In the conveying step, the spherical body is conveyed to the recess of the object to be tested, and the spherical body is adaptively held in the bottom of the recess of the object to be tested by its own gravity, wherein the diameter of the spherical body is smaller than the diameter of the arcuate surface in the bottom of the recess that holds the position of the spherical body; The correction step involves causing the spherical body to vibrate within the recess; The detection step involves bringing a contact detector into contact with the spherical object in the vertical direction.

12. The detection method according to claim 11, characterized in that, It also includes a positioning step, which positions the object to be detected along the horizontal direction.

13. The detection method according to claim 12, characterized in that, The detection step was performed multiple times.

14. The detection method according to claim 13, characterized in that, The correction step is performed multiple times, and the correction step and the detection step are performed alternately.

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