Image capturing mechanism and detection device

Abstract

The utility model provides an image capturing mechanism. The image capturing mechanism comprises a supporting assembly; the image taking piece is connected with the supporting assembly; the telecentric lens is connected with the supporting assembly, and the telecentric lens and the image taking piece are arranged at intervals in the optical axis direction of the image taking piece; the liquid lens is arranged on the side, facing the image taking piece, of the telecentric lens; the piezoelectric piece is arranged on the liquid lens in a sleeving manner and arranged on the side, facing the image taking piece, of the telecentric lens, and the piezoelectric piece is configured to deform after being powered on so as to adjust the curvature of the liquid lens; the light source piece is connected with the supporting assembly and located on the side, away from the image taking piece, of the telecentric lens. According to the image capturing mechanism, through the piezoelectric piece and the liquid lens, the zooming time required by the image capturing piece during shooting can be shortened, so that the image capturing efficiency of the image capturing piece is improved, in addition, through the telecentric lens, errors caused by visual angle selection or inaccurate placement of an object to be captured can be eliminated, image distortion is reduced, and the image capturing quality is improved. The utility model also provides a detection device comprising a bearing mechanism, a detection mechanism and the image capturing mechanism.

Description

Technical Field

[0001] This application relates to the field of visual inspection technology, specifically to an image acquisition mechanism and an inspection device. Background Technology

[0002] In the field of visual inspection, images of workpieces acquired by an image-grabbing mechanism at different focal lengths can exhibit different effects. Currently, a motor is typically used to drive the image-grabbing element in the mechanism to rise and fall relative to the workpiece, adjusting the focal length between the image-grabbing element and the workpiece. However, this motor-driven focusing method requires starting and stopping the motor, resulting in a long focusing time. Furthermore, the image-grabbing element is prone to positional shifts during the rising and falling process, necessitating an additional correction process, which further reduces image acquisition efficiency. Utility Model Content

[0003] In view of the above, it is necessary to provide an image acquisition mechanism and a detection device to improve image acquisition efficiency and image quality.

[0004] This application provides an image acquisition mechanism, including:

[0005] Support components;

[0006] The image-capturing element is connected to the support assembly;

[0007] A telecentric lens is connected to the support assembly and is spaced apart from the image sensor along the optical axis of the image sensor.

[0008] A liquid lens is disposed on the side of the telecentric lens facing the image acquisition element;

[0009] A piezoelectric element is sleeved on the liquid lens and disposed on the side of the telecentric lens facing the image acquisition element. The piezoelectric element is configured to deform after being energized to adjust the curvature of the liquid lens.

[0010] The light source is connected to the support assembly and located on the side of the telecentric lens opposite to the image acquisition element.

[0011] In the aforementioned imaging mechanism, the piezoelectric element and liquid lens can shorten the zoom time required for the imaging element to capture images, thereby improving the efficiency of image acquisition. Furthermore, the telecentric lens can eliminate errors caused by inaccurate viewing angle selection or workpiece placement, reducing image distortion and thus improving image quality.

[0012] In some embodiments, the support component includes:

[0013] Support components;

[0014] The first connector is detachably connected to the support and the imaging element, respectively.

[0015] The second connector is detachably connected to the support and the telecentric lens, respectively.

[0016] The third connector is detachably connected to both the support and the light source.

[0017] The first connector, the second connector, and the third connector are arranged sequentially along the optical axis of the image sensor.

[0018] Therefore, the first connector, the second connector and the third connector facilitate the assembly and disassembly of the image acquisition component, the telecentric lens and the light source, thereby reducing the assembly difficulty of the image acquisition mechanism.

[0019] In some embodiments, the first connector includes:

[0020] A first connector is detachably connected to the image sensor, and the first connector has a first adjustment hole arranged along the optical axis of the image sensor.

[0021] The first locking body includes a first threaded portion and a first locking portion. The first threaded portion passes through the first adjusting hole and is threadedly connected to the support member, and the first locking portion is connected to one end of the first threaded portion and pressed against the first connecting body.

[0022] Therefore, by using the first locking body in conjunction with the first adjusting hole, the position of the image acquisition element can be adjusted in the optical axis direction to expand the applicability of the image acquisition element.

[0023] In some embodiments, the second connector includes:

[0024] The second connector is detachably connected to the telecentric lens, and the second connector has a second adjustment hole arranged along the optical axis of the image sensor.

[0025] The second locking body includes a second threaded portion and a second locking portion. The second threaded portion passes through the second adjusting hole and is threadedly connected to the support member, and the second locking portion is connected to one end of the second threaded portion and pressed against the second connecting body.

[0026] Therefore, by using the second locking body in conjunction with the second adjusting hole, the position of the telecentric lens can be adjusted in the optical axis direction of the image acquisition element, thereby expanding the applicable range of the telecentric lens.

[0027] In some embodiments, the piezoelectric element includes at least one of a piezoelectric crystal, a piezoelectric ceramic, and a piezoelectric polymer.

[0028] Therefore, the above settings can ensure the accuracy of the deformation of the piezoelectric component after it is energized.

[0029] In some embodiments, the imaging mechanism further includes:

[0030] A condenser is connected to the support assembly and located between the light source and the telecentric lens. The condenser has a condenser hole that extends through the condenser along the optical axis of the image sensor.

[0031] Therefore, by using the focusing hole on the focusing element, the light generated by the light source can be concentrated and projected onto the telecentric lens, reducing the loss of light emitted by the light source and improving the efficiency of the light source.

[0032] In some embodiments, the image sensor, the telecentric lens, and the condenser aperture are coaxially arranged.

[0033] Therefore, the coaxially arranged image sensor, telecentric lens, and condenser aperture can reduce image distortion and improve the imaging quality of the image sensor mechanism.

[0034] In some embodiments, the support component further includes:

[0035] Base;

[0036] A first driving component is disposed on the base;

[0037] A second driving member is disposed on the first driving member to move along a first direction under the drive of the first driving member, and the second driving member is connected to the support member to drive the support member to move along a second direction.

[0038] The first direction, the second direction, and the optical axis direction of the imaging element are all perpendicular to each other.

[0039] Therefore, the above settings can expand the image acquisition range of the image acquisition mechanism to accommodate the acquisition of images of different specifications.

[0040] In some embodiments, the first driving member includes a first driving body and a first sliding body. The first driving body is disposed on the base and connected to the first sliding body, and is used to drive the first sliding body to move along the first direction. The second driving member includes a second driving body and a second sliding body. The second driving body is disposed on the first sliding body and connected to the second sliding body, and is used to drive the second sliding body to move along the second direction. The second sliding body is connected to the support member. The support assembly further includes a first stop and a second stop. The first stop is disposed on the base and is used to stop the first sliding body in the first direction. The second stop is disposed on the second driving body and is used to stop the second sliding body in the second direction.

[0041] Therefore, the above settings can limit the range of movement of the support in the first and second directions to ensure the imaging range of the image sensor.

[0042] This application embodiment also provides a detection device, including:

[0043] The aforementioned image acquisition mechanism;

[0044] A support mechanism is disposed on the side of the light source away from the telecentric lens and is used to support the workpiece to be tested. The image acquisition device is used to acquire images of the workpiece to be tested at different focal lengths to form multiple images to be tested.

[0045] The detection mechanism is electrically connected to the image acquisition element and the piezoelectric element respectively, and is used to acquire multiple images to be tested, and to detect the workpiece based on the multiple images to be tested.

[0046] In the aforementioned inspection device, the image acquisition mechanism, through piezoelectric elements and a liquid lens, can shorten the zoom time required for the image acquisition component to capture images, thereby improving the efficiency of image acquisition and thus enhancing the inspection efficiency of the device. Furthermore, the telecentric lens can eliminate errors caused by inaccurate viewing angle selection or workpiece placement, reducing image distortion and improving the image quality of the inspection device. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the imaging mechanism in an embodiment of this application.

[0048] Figure 2 for Figure 1 The diagram shows the structure of the liquid lens and piezoelectric element in the imaging mechanism.

[0049] Figure 3 for Figure 1 The diagram shows a partial structural schematic of the image-capturing mechanism.

[0050] Figure 4 for Figure 1 The diagram shows a partial structural diagram of the supporting components in the imaging mechanism.

[0051] Key component symbols: Imaging mechanism 100, support assembly 110, support member 111, first connector 112, first connecting body 1121, first adjusting hole 1121a, first locking body 1122, first threaded portion 1122a, first locking portion 1122b, second connector 113, second connecting body 1131, second adjusting hole 1131a, second locking body 1132, second threaded portion 1132a, second locking... Part 1132b, third connector 114, base 115, first drive member 116, first drive body 1161, first sliding body 1162, second drive member 117, second drive body 1171, second sliding body 1172, first stop member 118, second stop member 119, image capturing member 120, telecentric lens 130, liquid lens 140, piezoelectric member 150, light source member 160, focusing member 170, focusing aperture 170a. Detailed Implementation

[0052] The embodiments of this application are described in detail below. Examples of these 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 application, and should not be construed as limiting this application.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication between the two; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. In the description of this application, it should be noted that "multiple" means two or more, unless otherwise expressly and specifically limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0055] Please see Figure 1 This application provides an image acquisition mechanism 100 for acquiring multiple images of a workpiece at different focal lengths, facilitating subsequent workpiece inspection and other operations. The workpiece can be a mobile phone frame, mobile phone back panel, etc.

[0056] For ease of description, a three-dimensional coordinate system has been added to some of the accompanying drawings. Specifically, the X-axis is the direction of movement of the first sliding body 1162, the Y-axis is the direction of movement of the second sliding body 1172, and the Z-axis is the optical axis of the imaging element 120. The X-axis, Y-axis, and Z-axis are all perpendicular to each other.

[0057] Please see Figure 1 and Figure 2 The imaging mechanism 100 includes a support assembly 110, an image-capturing element 120, a telecentric lens 130, a liquid lens 140, a piezoelectric element 150, and a light source 160. The image-capturing element 120 is connected to the support assembly 110, and the telecentric lens 130 is connected to the support assembly 110 and spaced apart from the image-capturing element 120 along the optical axis of the image-capturing element 120. The liquid lens 140 is disposed on the side of the telecentric lens 130 facing the image-capturing element 120. The piezoelectric element 150 is sleeved on the liquid lens 140 and disposed on the side of the telecentric lens 130 facing the image-capturing element 120. The piezoelectric element 150 is configured to deform after being energized to adjust the curvature of the liquid lens 140. The light source 160 is connected to the support assembly 110 and located on the side of the telecentric lens 130 away from the image-capturing element 120.

[0058] It should be noted that the piezoelectric element 150 can adjust the curvature of the liquid lens 140 after being energized, thereby achieving zoom of the image capturing mechanism 100. The process and principle of the curvature change of the piezoelectric element 150 can be directly obtained from publicly available documents and will not be elaborated here.

[0059] In the aforementioned image-capturing mechanism 100, the piezoelectric element 150 and the liquid lens 140 can shorten the zoom time required for the image-capturing element 120 to capture images, thereby improving the efficiency of image acquisition by the image-capturing element 120. Furthermore, the telecentric lens 130 can eliminate errors caused by inaccurate angle selection or placement of the object to be captured, reducing image distortion and thus improving image quality.

[0060] Please see Figure 1 In some embodiments, the support assembly 110 includes a support member 111, a first connector 112, a second connector 113, and a third connector 114. The first connector 112 is detachably connected to the support member 111 and the image acquisition member 120, respectively; the second connector 113 is detachably connected to the support member 111 and the telecentric lens 130, respectively; and the third connector 114 is detachably connected to the support member 111 and the light source member 160, respectively. The first connector 112, the second connector 113, and the third connector 114 are arranged sequentially along the Z-axis optical axis.

[0061] Therefore, the first connector 112, the second connector 113 and the third connector 114 facilitate the assembly and disassembly of the image acquisition unit 120, the telecentric lens 130 and the light source unit 160, thereby reducing the assembly difficulty of the image acquisition mechanism 100.

[0062] Please see Figure 3In some embodiments, the first connector 112 includes a first connector body 1121 and a first locking body 1122. The first connector body 1121 is detachably connected to the image acquisition member 120. The first connector body 1121 has a first adjustment hole 1121a arranged along the Z-axis optical axis. The first locking body 1122 includes a first threaded portion 1122a and a first locking portion 1122b. The first threaded portion 1122a passes through the first adjustment hole 1121a and is threadedly connected to the support member 111. The first locking portion 1122b is connected to one end of the first threaded portion 1122a and pressed against the first connector body 1121. Exemplarily, the first locking body 1122 can be a bolt.

[0063] Therefore, by using the first locking body 1122 in conjunction with the first adjusting hole 1121a, the position of the image acquisition element 120 can be adjusted in the Z-axis optical axis direction to expand the applicable range of the image acquisition element 120.

[0064] In this embodiment, there are two first connecting members 112, which are respectively disposed on opposite sides of the image-capturing member 120 along the X-axis direction. Each first connecting member 112 is detachably connected to both the image-capturing member 120 and the support member 111. Furthermore, each first connecting body 1121 is provided with two first adjusting holes 1121a spaced apart along the Z-axis direction, and each first connecting member 112 also includes two first locking bodies 1122, with each adjusting hole 1121a corresponding to one of the two locking bodies 1122. Therefore, through the above arrangement, the stability of the image-capturing member 120 relative to the support member 111 can be improved.

[0065] Please see Figure 3 In some embodiments, the second connector 113 includes a second connector 1131 and a second locking body 1132. The second connector 1131 is detachably connected to the telecentric lens 130. The second connector 1131 has a second adjustment hole 1131a arranged along the Z-axis optical axis. The second locking body 1132 includes a second threaded portion 1132a and a second locking portion 1132b. The second threaded portion 1132a passes through the second adjustment hole 1131a and is threadedly connected to the support member 111. The second locking portion 1132b is connected to one end of the second threaded portion 1132a and pressed against the second connector 1131. Exemplarily, the second locking body 1132 can be a bolt.

[0066] Therefore, by using the second locking body 1132 in conjunction with the second adjusting hole 1131a, the position of the telecentric lens 130 can be adjusted in the Z-axis optical axis direction to expand the applicable range of the telecentric lens 130.

[0067] In this embodiment, the second connecting body 1131 is generally L-shaped, and two second adjusting holes 1131a are provided at intervals along the X-axis. There are two second locking bodies 1132 in the second connecting member 113, with each of the two second adjusting holes 1131a corresponding to one of the two second locking bodies 1132. Therefore, through the above arrangement, the stability of the telecentric lens 130 relative to the support member 111 can be improved.

[0068] In some embodiments, the piezoelectric element 150 includes at least one of a piezoelectric crystal, a piezoelectric ceramic, and a piezoelectric polymer.

[0069] Therefore, the above settings can ensure the accuracy of the deformation of the piezoelectric element 150 after it is energized.

[0070] Please see Figure 1 In some embodiments, the imaging mechanism 100 further includes a focusing element 170. The focusing element 170 is connected to the third connector 114 of the support assembly 110 and is located between the light source element 160 and the telecentric lens 130. The focusing element 170 has a focusing aperture 170a that extends through the focusing element 170 along the Z-axis direction. Exemplarily, the light source element 160 is a ring light source.

[0071] Therefore, the light generated by the light source 160 can be concentrated and projected onto the telecentric lens 130 through the light-concentrating hole 170a on the light-concentrating element 170, thereby reducing the loss of light emitted by the light source 160 and improving the utilization efficiency of the light source 160.

[0072] In some embodiments, the image sensor 120, the telecentric lens 130, and the condenser aperture 170a are coaxially arranged.

[0073] Therefore, the coaxially arranged image sensor 120, telecentric lens 130, and condenser aperture 170a can reduce image distortion and improve the imaging quality of the image sensor 100.

[0074] Please see Figure 4 In some embodiments, the support assembly 110 further includes a base 115, a first drive member 116, and a second drive member 117. The first drive member 116 is disposed on the base 115, and the second drive member 117 is disposed on the first drive member 116 to move along the X-axis direction under the drive of the first drive member 116. The second drive member 117 is connected to the support member 111 and is used to drive the support member 111 to move along the Y-axis direction.

[0075] Therefore, the above settings can expand the image acquisition range of the image acquisition mechanism 100 to accommodate the acquisition of images of different specifications.

[0076] Please see Figure 4In some embodiments, the first driving member 116 includes a first driving body 1161 and a first sliding body 1162. The first driving body 1161 is disposed on the base 115 and connected to the first sliding body 1162, and is used to drive the first sliding body 1162 to move along the X-axis direction. The second driving member 117 includes a second driving body 1171 and a second sliding body 1172. The second driving body 1171 is disposed on the first sliding body 1162 and connected to the second sliding body 1172, and is used to drive the second sliding body 1172 to move along the Y-axis direction. The second sliding body 1172 is connected to the support member 111. The support assembly 110 also includes a first stop 118 and a second stop 119. The first stop 118 is disposed on the base 115 and is used to stop the first sliding body 1162 in the X-axis direction. The second stop 119 is disposed on the second driving body 1171 and is used to stop the second sliding body 1172 in the Y-axis direction.

[0077] For example, both the first drive body 1161 and the second drive body 1171 can be rodless cylinders.

[0078] Therefore, by the above settings, the range of motion of the support member 111 in the X-axis and Y-axis directions can be limited to ensure the imaging range of the image capturing member 120.

[0079] This application embodiment also provides a detection device (not shown), including a support mechanism (not shown), a detection mechanism (not shown), and the aforementioned image acquisition mechanism 100. The support mechanism is disposed on the side of the light source 160 away from the telecentric lens 130, and is used to support the workpiece to be tested. The image acquisition device 120 is used to acquire images of the workpiece to be tested at different focal lengths to form multiple test images. The detection mechanism is electrically connected to the image acquisition device 120 and the piezoelectric element 150, respectively, and is used to acquire multiple test images and detect the workpiece based on the multiple test images.

[0080] In the aforementioned detection device, the image acquisition mechanism 100, through the piezoelectric element 150 and the liquid lens 140, can shorten the zoom time required for the image acquisition element 120 to capture images, thereby improving the efficiency of image acquisition by the image acquisition element 120 and thus improving the detection efficiency of the detection device. Furthermore, the telecentric lens 130 can eliminate errors caused by inaccurate viewing angle selection or placement of the object to be imaged, reducing image distortion and thus improving the image quality of the detection device.

[0081] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. An image taking mechanism, characterized by, The image-taking mechanism comprises: a support assembly; an image-taking component connected to the support assembly; a telecentric lens connected to the support assembly and arranged along an optical axis direction of the image-taking component; a liquid lens arranged on a side of the telecentric lens facing the image-taking component; a piezoelectric component sleeved on the liquid lens and arranged on a side of the telecentric lens facing the image-taking component, the piezoelectric component being configured to deform to adjust the curvature of the liquid lens after being powered on; and a light source component connected to the support assembly and located on a side of the telecentric lens away from the image-taking component. The support assembly comprises:

2. The image taking mechanism according to claim 1, wherein a support component; a first connecting component detachably connected to the support component and the image-taking component respectively; a second connecting component detachably connected to the support component and the telecentric lens respectively; and a third connecting component detachably connected to the support component and the light source component respectively; wherein the first connecting component, the second connecting component and the third connecting component are sequentially arranged along the optical axis direction of the image-taking component. The first connecting component comprises:

3. The image taking mechanism of claim 2, wherein a first connecting body detachably connected to the image-taking component, the first connecting body being provided with a first adjusting hole arranged along the optical axis direction of the image-taking component; a first locking body comprising a first threaded portion and a first locking portion, the first threaded portion penetrating the first adjusting hole and being threadedly connected to the support component, and the first locking portion being connected to one end of the first threaded portion and being pressed on the first connecting body. The second connecting component comprises:

4. The image taking mechanism of claim 2, wherein a second connecting body detachably connected to the telecentric lens, the second connecting body being provided with a second adjusting hole arranged along the optical axis direction of the image-taking component; a second locking body comprising a second threaded portion and a second locking portion, the second threaded portion penetrating the second adjusting hole and being threadedly connected to the support component, and the second locking portion being connected to one end of the second threaded portion and being pressed on the second connecting body. The piezoelectric component comprises at least one of a piezoelectric crystal, a piezoelectric ceramic and a piezoelectric polymer.

5. The image taking mechanism according to claim 1, wherein The image-taking mechanism further comprises:

6. The image taking mechanism of claim 1, wherein a light collecting component connected to the support assembly and located between the light source component and the telecentric lens, the light collecting component being provided with a light collecting hole penetrating the light collecting component along the optical axis direction of the image-taking component. The image-taking component, the telecentric lens and the light collecting hole are coaxially arranged.

7. The image taking mechanism according to claim 6, wherein The support assembly further comprises:

8. The image taking mechanism of claim 2, wherein a base; a first driving component arranged on the base; and a second driving component arranged on the first driving component and moving along a first direction under the driving of the first driving component, the second driving component being connected to the support component and used to drive the support component to move along a second direction; wherein the first direction, the second direction and the optical axis direction of the image-taking component are perpendicular to each other.

9. The image-taking mechanism of claim 8, wherein the first driving component comprises a first driving body and a first sliding body, the first driving body being arranged on the base and connected to the first sliding body and used to drive the first sliding body to move along the first direction. ​ The second driving member comprises a second driving body and a second sliding body, the second driving body is arranged on the first sliding body and connected with the second sliding body, and is used for driving the second sliding body to move along the second direction, and the second sliding body is connected with the support member; The support assembly further comprises a first stopper and a second stopper, the first stopper is arranged on the base and is used for stopping the first sliding body in the first direction, and the second stopper is arranged on the second driving body and is used for stopping the second sliding body in the second direction.

10. A detection device, characterized in that Comprise: The image capturing mechanism according to any one of claims 1 to 9; The carrying mechanism is arranged on the side of the light source member away from the telecentric lens, and is used for carrying a workpiece to be measured, and the image capturing member is used for acquiring images of the workpiece to be measured at different focal lengths to form a plurality of measured images; And The detection mechanism is electrically connected with the image capturing member and the piezoelectric element respectively, is used for acquiring a plurality of the measured images, and detects the workpiece based on a plurality of the measured images.

Images