Imaging apparatus compensating for height difference

Abstract

The utility model provides an imaging device for compensating height difference. The imaging device comprises a servo module assembly, an acquisition assembly, a light source and a parallel flat plate, the acquisition assembly and the light source are coaxially mounted on the servo module assembly, and the acquisition assembly is mounted above the light source; the installation height of the parallel flat plate is between the installation height of the acquisition assembly and the installation height of the light source; the servo module assembly drives the acquisition assembly and the light source to move away from or close to the parallel plate in the direction parallel to the plane where the object to be measured is located. The parallel flat plate allows the acquisition assembly to acquire the object to be measured through the parallel flat plate. By adding the parallel flat plate between the acquisition assembly and the light source, when light passes through the parallel flat plate, the optical path can be consumed, and by adopting the parallel flat plate with proper thickness, the depth-of-field influence caused by height difference can be eliminated, detection areas at different heights in an object to be detected can be subjected to the same detection, and meanwhile, clear imaging is realized; and two to-be-measured objects with different heights can be respectively and clearly imaged.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging devices, and particularly to an imaging device for compensating height difference. Background Technique

[0002] Optical imaging technology is a common optical detection technology, mainly used for the detection and analysis of the shape and size of objects. It uses optical principles and optical devices to convert the optical image of an object into an image in a two-dimensional space that can be recognized by the human eye, so as to achieve the purpose of detecting information such as the size, shape, and color of the object.

[0003] The existing Chinese patent with the publication number CN217546147U discloses an automatic photographing device that can avoid height difference. It includes a frame, a Z-axis moving mechanism vertically installed on the frame, and a photographing mechanism installed on the Z-axis moving mechanism; among them, the Z-axis moving mechanism includes: a power motor fixedly installed on the top of the frame; a transmission assembly installed on the frame and drivingly connected to the output end of the power motor; a sliding table connected to the output end of the transmission assembly, so that under the drive of the power motor, the transmission assembly drives the sliding table to lift and slide along the Z-axis direction of the frame; the photographing mechanism includes: a lens mounting plate fixedly installed on the sliding table of the Z-axis moving mechanism; a photographing assembly fixedly installed on the lens mounting plate; a positioning sensor installed on the lens mounting plate and arranged on one side of the photographing assembly.

[0004] When existing optical detection is used for imaging features at different depths, two sets of cameras are mostly selected, or a moving device is added in the height direction to drive the whole camera to move up and down for focusing; selecting two sets of cameras or adding an up and down moving device both increases the cost, and only adding an up and down moving device cannot make two planes at different heights be clearly imaged simultaneously. Content of the Utility Model

[0005] Aiming at the defects in the prior art, the purpose of the utility model is to provide an imaging device for compensating height difference.

[0006] An imaging device for compensating height difference according to the utility model includes a servo module assembly, a collection component, a light source, and a parallel flat plate;

[0007] The collection component and the light source are coaxially installed on the servo module assembly, and the collection component is installed above the light source;

[0008] The installation height of the parallel flat plate is between the installation height of the collection component and the installation height of the light source;

[0009] The servo module assembly drives the acquisition component and the light source to move away from or close to the parallel plate in a direction parallel to the plane where the object to be measured is located;

[0010] The parallel plate allows the acquisition component to collect the object to be measured through the parallel plate.

[0011] Preferably, the parallel plate includes a full-transmission mirror.

[0012] Preferably, the acquisition component includes a camera and a telecentric lens. The telecentric lens is installed below the camera, and the camera, the telecentric lens, and the light source are coaxially installed on the servo module assembly.

[0013] Preferably, the light source includes an annular light source, and the hollow part of the annular light source allows the acquisition component to collect the object to be measured through the parallel plate.

[0014] Preferably, the servo module assembly includes a servo fixing frame, a servo module, and a servo connecting plate. The servo module is arranged on the servo fixing frame, the servo connecting plate is arranged on the servo module, the servo module drives the servo connecting plate to move, and both the acquisition component and the light source are installed on the servo connecting plate.

[0015] Preferably, the servo fixing frame includes a servo fixing base and a servo fixing rod. The servo fixing rod is installed on the servo fixing base, and the servo module is installed on the servo fixing rod.

[0016] Preferably, both the acquisition component and the light source are detachably installed on the servo connecting plate through a bearing connecting plate.

[0017] Preferably, the acquisition component is detachably installed on the bearing connecting plate through an acquisition component fixing block, and the light source is detachably installed on the bearing connecting plate through a light source fixing block.

[0018] Preferably, the camera and the telecentric lens are respectively detachably installed on the servo module assembly through a camera fixing block and a lens fixing block.

[0019] Preferably, the parallel plate is detachably installed on the fixing rod through a parallel plate fixing block.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. By adding a parallel plate between the acquisition component and the light source in the utility model, when light passes through the parallel plate, the optical path will be consumed. By using a parallel plate with an appropriate thickness, it is beneficial to eliminate the depth-of-field influence caused by the height difference, perform the same detection on the detection areas at different heights in the object to be measured, and achieve clear imaging at the same time. It can also perform clear imaging on two objects to be measured at different heights respectively;

[0022] 2. The utility model solves the problem that when the height difference between two focal planes in imaging is too large and clear imaging cannot be achieved simultaneously by setting the parallel flat plate as a total transmission mirror, which transmits all incident light without changing the incident light direction and without magnifying or reducing the object. Different thicknesses of total transmission mirrors are used according to the objects to be measured with different height differences.

[0023] 3. The utility model coaxially installs the acquisition device and the light source on the servo module, and the servo module drives the acquisition component and the light source to move, realizing the movement of the detection position, which is beneficial to quickly adjust according to different objects to be measured, saving time and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, purposes and advantages of the utility model will become more obvious by reading the detailed description of the non-restrictive embodiments with reference to the following drawings:

[0025] Figure 1 It is a schematic three-dimensional structure diagram mainly showing the imaging device of the utility model;

[0026] Figure 2 It is a schematic three-dimensional structure diagram mainly showing the imaging device of the utility model;

[0027] Figure 3 It is a schematic structure diagram mainly showing the imaging device of the utility model;

[0028] Figure 4 It is a schematic diagram mainly showing the imaging principle of the utility model.

[0029] In the figure:

[0030] Camera 1, Servo fixing base 7, Light source fixing block 13

[0031] Telecentric lens 2, Servo fixing rod 8, Parallel flat plate fixing block 14

[0032] Light source 3, Servo connecting plate 9, Fixing rod 15

[0033] Object to be measured 4, Carrying connecting plate 10, Second feature 16

[0034] Parallel flat plate 5, Camera fixing block 11, First feature 17

[0035] Servo module 6, Lens fixing block 12 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The present utility model will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present utility model, but do not limit the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several changes and improvements can still be made. These all belong to the protection scope of the present utility model.

[0037] As Figure 1 and Figure 2 shown, an imaging device for compensating height difference according to the present utility model includes a servo module assembly, an acquisition assembly, a light source 3, and a parallel flat plate 5; the acquisition assembly and the light source 3 are coaxially installed on the servo module assembly, and the acquisition assembly is installed above the light source 3; the installation height of the parallel flat plate 5 is between the installation height of the acquisition assembly and the installation height of the light source 3; the servo module assembly drives the acquisition assembly and the light source 3 to move away from or close to the parallel flat plate 5 in a direction parallel to the plane where the object to be measured 4 is located; the parallel flat plate 5 allows the acquisition assembly to collect the object to be measured 4 through the parallel flat plate 5.

[0038] For the imaging device of the present utility model, the position of the parallel flat plate 5 can be selected to be fixed, and the servo module assembly is used to drive the acquisition assembly and the light source 3 to move to realize the movement of the detection position. As Figure 1 shown, the parallel flat plate 5 is not within the field of view of the acquisition assembly. At this time, the height of the detection area of the object to be measured 4 to be detected remains the same, and there is a focusing plane with the same height. As Figure 2 shown, the parallel flat plate 5 participates in the field of view of the acquisition assembly. When light passes through the parallel flat plate 5, the optical path will be consumed. By using a parallel flat plate 5 with an appropriate thickness, the depth-of-field influence caused by the height difference can be eliminated, and the detection areas at different heights in the object to be measured 4 can be detected simultaneously and clearly imaged. It can also clearly image two objects to be measured 4 with different heights, solving the problem that two sets of acquisition components are required for objects to be measured 4 with different heights, or a moving device in the height direction is required to drive the entire acquisition assembly to move up and down for focusing, saving the cost of a set of cameras or the up-and-down moving device.

[0039] Specifically, the parallel flat plate 5 includes a total transmission mirror. The total transmission mirror transmits all incident light, as Figure 3As shown, the surface of the object to be measured 4 is distributed with a first feature 17 and a second feature 16. The heights of the surfaces where the first feature 17 and the second feature 16 are located are different. Then, the focal planes of the first feature 17 and the second feature 16 are different. Among them, the surface where the second feature 16 is located is farther from the acquisition component, and it is the feature surface with a greater distance from the acquisition component among two adjacent feature surfaces with different heights on the surface of the object to be measured 4. Place the full-transmission lens above the position of the second feature 16, and the full-transmission lens is located between the acquisition component and the light source 3. The light source 3 provides appropriate brightness for the second feature 16. By changing the optical path of the second feature 16, the position of light focusing is adjusted. After appropriate adjustment, clear images of both the first feature 17 and the second feature 16 can be obtained in the same field of view. Assume that when the full-transmission lens is not added, the acquisition component can focus at the position of the surface where the first feature 17 is located, and the features on the surface where the first feature 17 is located can be clearly photographed. After adding a full-transmission lens with a certain thickness, the focusing position of the surface where the second feature 16 is located changes, and thus the features on the surface where the second feature 16 is located can also be clearly photographed.

[0040] As Figure 4 shown, when light passes through the full-transmission lens, the incident light direction remains unchanged, and the object will not be magnified or reduced. This application satisfies the paraxial condition. According to the formula ΔL1 = d*(1 - 1 / n), where ΔL1 is the distance that needs to be shortened, d is the thickness of the parallel plate 5, and n is the refractive index of the medium passed through (generally, for plexiglass, n = 1.49). Using this formula and principle, a parallel plate 5 (full-transmission lens) with an appropriate thickness is adopted to consume a certain amount of optical path and shorten the optical path difference, so that the high and low detection regions can be clearly imaged at the same detection height, solving the problem that the two features have a large height difference and cannot be clearly imaged at the same position height, enabling the first feature 17 and the second feature 16 to be clearly imaged simultaneously, solving the problem of the depth-of-field difference that the two features with a large height difference cannot be measured by a single photo, saving time and improving the test efficiency.

[0041] Specifically, the acquisition component includes a camera 1 and a telecentric lens 2. The telecentric lens 2 is installed below the camera 1. The camera 1, the telecentric lens 2, and the light source 3 are coaxially installed on the servo module component. The coaxial installation of the camera 1, the telecentric lens 2, and the light source 3 can achieve good focusing on the object to be measured 4. The object to be measured 4 is located at the center of the field of view of the camera 1, and the parallel plate 5 is located on one side of the field of view of the camera 1. In the imaging field of view, the parallel plate 5 needs to cover the focal plane of the object to be measured 4, and the inner diameter of the light source 3 does not block the object to be measured 4 and the parallel plate 5. A feasible implementation is that the light source 3 includes an annular light source 3, and the hollow part of the annular light source 3 allows the acquisition component to collect the object to be measured 4 through the parallel plate 5.

[0042] Specifically, as Figure 1 and Figure 2As shown in the figure, the servo module assembly includes a servo fixing bracket, a servo module 6, and a servo connecting plate 9. The servo module 6 is disposed on the servo fixing bracket, the servo connecting plate 9 is disposed on the servo module 6, the servo module 6 drives the servo connecting plate 9 to move, and both the acquisition component and the light source 3 are mounted on the servo connecting plate 9. The servo fixing bracket includes a servo fixing base 7 and a servo fixing rod 8. The servo fixing rod 8 is mounted on the servo fixing base 7, and the servo module 6 is mounted on the servo fixing rod 8. Both the acquisition component and the light source 3 are detachably mounted on the servo connecting plate 9 through a bearing connecting plate 10. The acquisition component is detachably mounted on the bearing connecting plate 10 through an acquisition component fixing block. The acquisition component includes a camera 1 and a telecentric lens 2. The camera 1 and the telecentric lens 2 are respectively detachably mounted on the servo module assembly through a camera fixing block 11 and a lens fixing block 12. The light source 3 is detachably mounted on the bearing connecting plate 10 through a light source fixing block 13. The parallel plate 5 is detachably mounted on the fixing rod 15 through a parallel plate fixing block 14. The servo connecting plate 9 is mounted on the servo module 6, and the bearing connecting plate 10 is mounted on the servo connecting plate 9. The position of the bearing connecting plate 10 mounted on the servo connecting plate 9 can be determined according to actual needs. The camera 1, the telecentric lens 2, and the light source 3 are coaxially mounted on the bearing connecting plate 10 from top to bottom in sequence. In this way, the servo module 6 drives the servo connecting plate 9 to move horizontally, and the camera 1, the telecentric lens 2, and the light source 3 mounted on the servo connecting plate 9 move horizontally to change the detection position. The parallel plate 5 is mounted on the fixing rod 15 on one side of the servo module assembly, and the position of the parallel plate 5 on the fixing rod 15 can be determined according to actual needs.

[0043] The servo module 6 drives the camera 1, the telecentric lens 2, and the light source 3 to move horizontally to switch the detection position. The position of the parallel plate 5 can be selected to be fixed. By switching the presence or absence of the parallel plate 5 within the field of view, clear imaging at the same detection height can be performed on detection areas or products with different height differences.

[0044] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0045] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments and features in the embodiments of the present application can be combined arbitrarily.

Claims

1. An imaging device for compensating height difference, characterized in that: It comprises a servo module component, a collection component, a light source (3) and a parallel plate (5); The acquisition component and the light source (3) are coaxially mounted on the servo module component, and the acquisition component is mounted above the light source (3); The installation height of the parallel plate (5) is between the installation height of the collection component and the installation height of the light source (3); The servo module assembly drives the acquisition assembly and the light source (3) to move away from or toward the parallel plate (5) in a direction parallel to the plane where the object to be measured (4) is located; The parallel flat plate (5) allows the collection component to collect the object to be tested (4) through the parallel flat plate (5).

2. The imaging device for compensating height difference according to claim 1, characterized in that: The parallel flat plate (5) comprises a total transmission mirror.

3. The imaging device for compensating height difference according to claim 1, characterized in that: The acquisition component comprises a camera (1) and a telecentric lens (2), wherein the telecentric lens (2) is mounted below the camera (1), and the camera (1), the telecentric lens (2) and the light source (3) are coaxially mounted on a servo module component.

4. The imaging device for compensating height difference according to claim 1, characterized in that: The light source (3) comprises an annular light source (3), the hollow portion of the annular light source (3) allowing the collection component to collect the object to be measured (4) through the parallel flat plate (5).

5. The imaging device for compensating height difference according to claim 1, characterized in that: The servo module assembly comprises a servo fixing frame, a servo module (6), and a servo connecting plate (9); the servo module (6) is arranged on the servo fixing frame; the servo connecting plate (9) is arranged on the servo module (6); the servo module (6) drives the servo connecting plate (9) to move; and the acquisition assembly and the light source (3) are both mounted on the servo connecting plate (9).

6. The imaging device for compensating height difference according to claim 5, characterized in that: The servo fixing frame comprises a servo fixing seat (7) and a servo fixing rod (8), wherein the servo fixing rod (8) is mounted on the servo fixing seat (7), and the servo module (6) is mounted on the servo fixing rod (8).

7. The imaging device for compensating height difference according to claim 5, characterized in that: The collection assembly and the light source (3) are both detachably mounted on the servo connection plate (9) via a bearing connection plate (10).

8. The imaging device for compensating height difference according to claim 7, characterized in that: The collection component is detachably mounted on the bearing connection plate (10) via a collection component fixing block, and the light source (3) is detachably mounted on the bearing connection plate (10) via a light source fixing block.

9. The imaging device for compensating height difference according to claim 3, characterized in that: The camera (1) and the telecentric lens (2) are detachably mounted on the servo module assembly via a camera fixing block (11) and a lens fixing block (12), respectively.

10. The imaging device for compensating height difference according to claim 1, characterized in that: The parallel plate (5) is detachably mounted on the fixing rod (15) via a parallel plate fixing block (14).

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