A multi-aperture optical axis adjustment device with a universal camera positioning support structure

Abstract

The present invention relates to a multi-aperture optical axis adjustment device with a universal camera positioning support structure, comprising a support frame, two circular rings, two camera support platforms and two camera clamping and positioning mechanisms, the support frame is composed of a bottom plate and a support plate, two support plate through holes are provided on the support plate, three bosses are arranged outside the support plate through holes, three waist holes are correspondingly provided on the circular ring, and the optical axis direction is adjusted by changing the thickness of the adjustment gasket between each boss and the corresponding waist hole; the two camera support platforms are respectively clamped at the bottom of the two circular rings, and the camera support platforms are provided with mounting holes for positioning and installing cameras; the two camera clamping and positioning mechanisms are respectively connected to the upper parts of the two circular rings, can move up and down, and have an openable and closable machine clamp at the lower part to clamp and position the camera; the optical axis adjustment method corresponding to the device determines the insertion thickness and insertion position of the adjustment gasket according to the optical axis adjustment angle and adjustment direction. The device has high adjustment accuracy and efficiency, convenient operation, good stability and strong versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of optical axis calibration, and in particular to a multi-aperture optical axis adjustment device with a universal camera positioning support structure. Background Art

[0002] Optical axis consistency is an important indicator to ensure the imaging quality of multi-aperture cameras, and is usually measured by the deflection angle between multiple optical axes. In optical system pointing control, human-computer interaction engineering, and computational imaging post-processing, optical axis parallelism calibration is a necessary step to achieve the normal operation of the system. The main correction method is to use adjustment bolts or insert adjustment gaskets. However, due to the limitations of process level and processing accuracy, the optical axis calibration using adjustment bolts has low accuracy, poor anti-interference, and the structure is often very complex, which is not conducive to mass production. The method of using adjustment gaskets to correct the optical axis is simple and has excellent anti-vibration characteristics, but due to the existence of interference factors such as uneven thickness of the adjustment gasket and surface roughness of the structure, the gasket has a certain randomness and complexity when correcting the optical axis deflection angle within 60″. On the other hand, since the multi-aperture optical system equipped with an optical axis adjustment structure has high requirements for accuracy, it generally does not have the function of secondary disassembly and assembly, which makes it extremely inconvenient to replace cameras of different sizes during image acquisition of multi-aperture cameras, and even requires the reprocessing of the frame, resulting in increased costs. Summary of the invention

[0003] The object of the present invention is to provide a multi-aperture optical axis adjustment device with a universal camera positioning support structure, which has high adjustment accuracy and efficiency, convenient operation, good stability and strong versatility.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a multi-aperture optical axis adjustment device with a universal camera positioning support structure, comprising a support frame, two circular rings, two camera support platforms and two camera clamping and positioning mechanisms, the support frame is composed of a base plate and a support plate vertically connected to the base plate, the support plate is provided with two support plate through holes for inserting cameras, and three bosses are arranged on the outer periphery of each support plate through hole, and three waist holes are provided on the circular ring corresponding to the three bosses, and the three bosses of the support plate are respectively connected to the three waist holes of the circular ring by threaded fasteners, and the optical axis direction is adjusted by changing the thickness of the adjusting gasket between each boss and the corresponding waist hole; the two camera support platforms are respectively clamped at the bottom of the inner side walls of the two circular rings, respectively used to place the reference camera and the correction camera, and the camera support platforms are provided with a plurality of mounting holes for positioning and installing the camera; the two camera clamping and positioning mechanisms are respectively fixedly connected to the upper parts of the two circular rings, the camera clamping and positioning mechanisms can move up and down, and the lower part thereof has an openable and closable machine clamp to clamp and position the camera.

[0005] Furthermore, the three waist holes are evenly distributed on the ring at intervals of 120° with the center of the ring as the center, and the waist holes have a stroke of 10° to achieve posture adjustment of the x-axis rotational freedom.

[0006] Furthermore, the camera support is provided with a plurality of elongated mounting holes and circular mounting holes of different widths, so as to facilitate the installation of cameras of different models and specifications.

[0007] Furthermore, the camera clamping and positioning mechanism includes a slider, an inverted T-shaped clamping frame, a stud and left and right machine clamps; the slider is fixedly connected to the upper part of the ring by a threaded fastener, and a slide groove is provided on the slider, and the upper part of the inverted T-shaped clamping frame passes through the slide groove and slidably cooperates with the slide groove, and is locked and fixed by a locking bolt; the spiral directions of the left and right sections of external threads on the stud are opposite, and the upper parts of the left and right machine clamps respectively have internal threads that mesh with the left and right sections of external threads, and the lower part has a clamping part for clamping the camera, and the lower part of the inverted T-shaped clamping frame is provided with a transverse through hole for inserting the stud and the upper part of the machine clamp, and the left and right machine clamps are driven to move back or toward each other by rotating the stud, thereby realizing the opening and closing of the machine clamp to clamp and position the camera.

[0008] Furthermore, the cross section of the upper portion of the inverted T-shaped clamping frame is a T-shaped structure, and the cross section of the sliding groove is a T-shaped through hole corresponding to the T-shaped structure.

[0009] Furthermore, anti-skid rubber pads are attached to the lower side surface of the lower part of the inverted T-shaped clamping frame and the clamping surface of the machine clamp.

[0010] Furthermore, a knob is provided at one end of the stud.

[0011] Furthermore, a threaded hole is opened on the side of the lower part of the inverted T-shaped clamping frame and is equipped with a stud locking bolt to lock the stud.

[0012] Furthermore, the reference camera and the calibration camera are mounted on two camera supports respectively, and the deflection direction of the target in the collimator is calculated by the two cameras. The number of deflected pixels ρ is calculated as:

[0013]

[0014] Wherein, x represents the number of pixels that the calibration camera is deflected by compared with the reference camera in the horizontal direction, and y represents the number of pixels that the calibration camera is deflected by compared with the reference camera in the vertical direction;

[0015] Based on the principle of three points and one plane, the optical axis direction of the correction camera is adjusted by changing the thickness of the adjustment gaskets connected in series between the three bosses and the corresponding waist holes at the correction camera; let the thickness of the adjustment gasket connected in series at the first boss be t1, the thickness of the adjustment gasket connected in series at the second boss be t2, the thickness of the adjustment gasket connected in series at the third boss be t3, and the distance between the centers of the two bosses be L, then the relationship between the thickness of the adjustment gasket and the adjustment direction of the optical axis is:

[0016]

[0017] Then the relationship between the thickness of the adjustment gasket, the optical axis adjustment angle, and the number of target moving pixels is calculated as follows:

[0018]

[0019]

[0020] Among them, θ adjustment represents the camera adjustment angle, ρ adjustment Indicates that the camera adjusts the number of pixels. represents the camera adjustment direction, μ represents the pixel size of the calibration camera, and f represents the focal length of the calibration camera; by adjusting t1, t2, and t3 ρ adjustment =ρ, so that the optical axes of the calibration camera and the reference camera are pointed in the same direction.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the device provides a multi-aperture optical axis adjustment device with a universal camera positioning support structure and a corresponding optical axis adjustment method, which has good controllability while improving the adjustment accuracy, is simpler to operate, and has higher optical axis adjustment efficiency; in addition, the device is also provided with a universal camera positioning support structure, which can flexibly load cameras of different aperture sizes while ensuring the adjustment accuracy and vibration resistance, has universality and is conducive to cost saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the device structure of an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the arrangement of mounting holes on the camera support platform in an embodiment of the present invention.

[0024] Figure 3 It is a structural schematic diagram of a camera clamping and positioning mechanism in an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of the structure of optical axis adjustment in an embodiment of the present invention.

[0026] Figure 5It is a schematic diagram of the principle of adjusting the optical axis by adjusting the gasket in an embodiment of the present invention.

[0027] Figure 6 4 is a diagram showing the effect of adjusting the optical axis by adjusting the gasket in an embodiment of the present invention.

[0028] In the figure: 1-base plate; 2-support plate; 3-circular ring; 4-circular ring; 5-M3 bolt; 6-M3 bolt; 7-M3 bolt; 8-M3 bolt; 9-M3 bolt; 10-M3 bolt; 11-calibration camera; 12-reference camera; 13-camera support; 14-camera support; 15-slider; 16-inverted T-type clamp; 17-slider; 18-inverted T-type clamp; 19-M3 locking bolt; 20-M3 locking bolt; 21-stud locking bolt; 22-anti-slip rubber pad; 23-stud; 24-; 25-machine clamp; 26-boss; 27-boss; 28-boss; 29-adjustment gasket; 30-long mounting hole; 31-long mounting hole; 32-circular mounting hole. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] like Figure 1-4As shown, this embodiment provides a multi-aperture optical axis adjustment device with a universal camera positioning support structure, including a support frame, two circular rings 3, 4, two camera supports 13, 14, and two camera clamping and positioning mechanisms. The support frame is composed of a base plate 1 and a support plate 2 vertically connected to the base plate 1, and the support plate 2 is provided with two support plate through holes for inserting cameras, and three bosses 26, 27, 28 are arranged on the outer periphery of each support plate through hole, and a through hole or a threaded hole is provided on the boss, and three waist holes are provided on the circular ring corresponding to the three bosses 26, 27, 28. The three bosses 26, 27, 28 of the support plate are connected to the three waist holes of the circular ring by M3 bolts 5, 6, 7 respectively, and the optical axis direction is adjusted by changing the thickness of the adjusting gasket 29 between each boss and the corresponding waist hole. The two camera supports 13 and 14 are respectively clamped at the bottom of the inner walls of the two circular rings 3 and 4, and are respectively used to place the reference camera 12 and the correction camera 11. The camera supports are provided with a plurality of mounting holes for positioning and installing the cameras. The two camera clamping and positioning mechanisms are respectively fixedly connected to the upper parts of the two circular rings 3 and 4. The camera clamping and positioning mechanisms can move up and down and have an openable and closable machine clamp at the lower part to clamp and position the cameras.

[0033] In this embodiment, the purpose of setting the boss on the support plate is to reduce the contact area between the ring and the support plate, thereby reducing the influence of the rough surface on the optical axis adjustment accuracy. The three waist holes are evenly distributed on the ring at intervals of 120° with the center of the ring as the center, and the waist holes are waist holes with a stroke of 10° to achieve the posture adjustment of the x-axis rotational freedom.

[0034] In this embodiment, the thickness of the bottom plate 1 is 10 mm, the thickness of the support plate is 10 mm, the inner radius of the rings 3 and 4 is 35 mm, and the thickness is 8 mm. The length of the camera support 13 and 14 is 57 mm, and the thickness is 8 mm. The height of the boss is 0.5 mm.

[0035] like Figure 2 As shown, the camera support is provided with a plurality of strip mounting holes 30, 31 and a circular mounting hole 32 of different widths, so as to facilitate the installation of cameras of different models and specifications. In this embodiment, the width of the strip mounting hole 30 is 3 mm, the width of the strip mounting hole 31 is 2 mm, and the diameter of the circular mounting hole 32 is 5 mm.

[0036] like Figure 3As shown, the camera clamping and positioning mechanism includes a slider 15, an inverted T-shaped clamping frame 16, a stud 23 and left and right machine clamps 25. The slider 15 is fixedly connected to the upper part of the ring 3 by an M3 bolt, and a slide groove is provided on the slider 15. The upper part of the inverted T-shaped clamping frame 16 passes through the slide groove and slides with the slide groove, and is locked and fixed by two M3 locking bolts 19 and 20. The spiral directions of the left and right sections of the external threads on the stud 23 are opposite. The upper parts of the left and right machine clamps 25 respectively have internal threads meshing with the left and right sections of the external threads, and the lower parts have a clamping part for clamping the camera. The lower part of the inverted T-shaped clamping frame 16 is provided with a transverse through hole for inserting the stud 23 and the upper part of the machine clamp 25. The left and right machine clamps are driven to move in opposite directions or towards each other by rotating the stud, thereby realizing the opening and closing of the machine clamps to clamp and position the camera. In this embodiment, the clamping range of the machine clamp is 20 mm to 50 mm.

[0037] In this embodiment, the cross section of the upper portion of the inverted T-shaped clamping frame 16 is a T-shaped structure, and the cross section of the slide groove is a T-shaped through hole corresponding to the T-shaped structure. The lower side surface of the lower portion of the inverted T-shaped clamping frame 16 and the clamping surface of the machine clamp 25 are both affixed with an anti-slip rubber pad 22. A knob is provided at one end of the stud 23. A threaded hole is provided on the side of the lower portion of the inverted T-shaped clamping frame 16 and a stud locking bolt 21 is provided to lock the stud 23.

[0038] In this embodiment, the height of the slider 15 is 22 mm, that is, the stroke of the slide is 22 mm. The T-shaped through hole of the slide is composed of two rectangular through holes of 3 mm×8 mm and 6 mm×12 mm. The left and right sections of the external threads on the stud 23 are M4 threads with a stroke of 18 mm.

[0039] This embodiment also provides an optical axis adjustment method based on the above-mentioned multi-aperture optical axis adjustment device, which is specifically implemented as follows:

[0040] The reference camera 12 and the calibration camera 11 are respectively mounted on two camera supports, and the deflection direction of the target in the collimator is calculated by the two cameras. The number of deflected pixels ρ is calculated as:

[0041]

[0042] Wherein, x represents the number of pixels that the calibration camera is deflected from the reference camera in the horizontal direction, and y represents the number of pixels that the calibration camera is deflected from the reference camera in the vertical direction.

[0043] Based on the principle of three points and one plane, the optical axis direction of the correction camera can be adjusted by changing the thickness of the adjustment gaskets connected in series between the three bosses and the corresponding waist holes. Figure 5As shown, let the thickness of the adjusting gasket connected in series at the first boss (i.e., M3 bolt 5) be t1, let the thickness of the adjusting gasket connected in series at the second boss (i.e., M3 bolt 6) be t2, let the thickness of the adjusting gasket connected in series at the third boss (i.e., M3 bolt 7) be t3, let the distance between the centers of the two bosses be L = 69 mm, then the relationship between the thickness of the adjusting gasket and the optical axis adjustment direction is:

[0044]

[0045] Then the relationship between the thickness of the adjustment gasket, the optical axis adjustment angle, and the number of target moving pixels is calculated as follows:

[0046]

[0047]

[0048] Among them, θ adjustment represents the camera adjustment angle, ρ adjustment Indicates that the camera adjusts the number of pixels. represents the camera adjustment direction, μ represents the pixel size of the calibration camera, and f represents the focal length of the calibration camera; by adjusting t1, t2, and t3 ρ adjustment =ρ, so that the optical axes of the calibration camera and the reference camera are pointed in the same direction.

[0049] In order to facilitate the use of equations (2), (3), and (4) in actual optical axis adjustment work, the present invention establishes a polar coordinate system as follows: Figure 6 The origin o of the polar coordinates represents the position of the target captured by the calibration camera without a gasket. The polar diameter ρ of the polar coordinates represents the number of pixels moved by the target. The polar angle Indicates the direction of optical axis adjustment, and uses (t1, t2, t3) to indicate the thickness of the adjustment gasket at bolts 5, 6, and 7, in mm. Figure 6 The adjustment effect diagram can intuitively determine the influence of adjusting the shim thickness t1, t2, t3 on the optical axis direction, so as to minimize the randomness of the optical axis adjustment process and ensure ρ adjustment =ρ, so that the optical axes of the calibration camera 11 and the reference camera 12 are pointed in the same direction.

[0050] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A multi-aperture optical axis adjustment device with a universal camera positioning support structure, characterized in that: The invention comprises a support frame, two circular rings, two camera supports and two camera clamping and positioning mechanisms. The support frame is composed of a base plate and a support plate vertically connected to the base plate. Two support plate through holes for inserting cameras are provided on the support plate. Three bosses are arranged on the outer periphery of each support plate through hole. Three waist holes are provided on the circular ring corresponding to the three bosses. The three bosses of the support plate are connected to the three waist holes of the circular ring respectively by threaded fasteners, and the direction of the optical axis is adjusted by changing the thickness of the adjusting gaskets between each boss and the corresponding waist hole; the two camera supports are respectively clamped at the bottom of the inner side walls of the two circular rings, and are respectively used to place the reference camera and the correction camera. A plurality of mounting holes for positioning and installing the cameras are provided on the camera supports; the two camera clamping and positioning mechanisms are respectively fixedly connected to the upper parts of the two circular rings, the camera clamping and positioning mechanisms can move up and down, and the lower part thereof has an openable and closable machine clamp to clamp and position the cameras.

2. The multi-aperture optical axis adjustment device with a universal camera positioning support structure according to claim 1, characterized in that: The three waist holes are evenly distributed on the ring at intervals of 120° with the center of the ring as the center, and the waist holes have a stroke of 10° to achieve posture adjustment of the x-axis rotational freedom.

3. The multi-aperture optical axis adjustment device with a universal camera positioning support structure according to claim 1, characterized in that: The camera support is provided with a plurality of long strip mounting holes and circular mounting holes with different widths, so as to facilitate the installation of cameras of different models and specifications.

4. The multi-aperture optical axis adjustment device with a universal camera positioning support structure according to claim 1, characterized in that: The camera clamping and positioning mechanism includes a slider, an inverted T-shaped clamping frame, a stud and left and right machine clamps; the slider is fixedly connected to the upper part of the ring by a threaded fastener, and a slide groove is provided on the slider, and the upper part of the inverted T-shaped clamping frame passes through the slide groove and slidably cooperates with the slide groove, and is locked and fixed by a locking bolt; the spiral directions of the left and right sections of external threads on the stud are opposite, and the upper parts of the left and right machine clamps respectively have internal threads that mesh with the left and right sections of external threads, and the lower part has a clamping part for clamping the camera, and the lower part of the inverted T-shaped clamping frame is provided with a transverse through hole for inserting the stud and the upper part of the machine clamp, and the left and right machine clamps are driven to move back or toward each other by rotating the stud, thereby realizing the opening and closing of the machine clamp to clamp and position the camera.

5. The multi-aperture optical axis adjustment device with a universal camera positioning support structure according to claim 4, characterized in that: The cross section of the upper portion of the inverted T-shaped clamping frame is a T-shaped structure, and the cross section of the sliding groove is a T-shaped through hole corresponding to the T-shaped structure.

6. The multi-aperture optical axis adjustment device with a universal camera positioning support structure according to claim 4, characterized in that: The lower side surface of the lower part of the inverted T-shaped clamping frame and the clamping surface of the machine clamp are both affixed with anti-skid rubber pads.

7. The multi-aperture optical axis adjustment device with a universal camera positioning support structure according to claim 4, characterized in that: A knob is provided at one end of the stud.

8. The multi-aperture optical axis adjustment device with a universal camera positioning support structure according to claim 4, characterized in that: A threaded hole is provided on the side of the lower part of the inverted T-shaped clamping frame and a stud locking bolt is provided to lock the stud.

9. The multi-aperture optical axis adjustment device with a universal camera positioning support structure according to claim 1, characterized in that: Mount the reference camera and the calibration camera on two camera supports respectively, and calculate the deflection direction of the two cameras shooting the target in the collimator. The number of deflected pixels ρ is calculated as: Where x represents the number of pixels that the calibration camera is deflected by compared to the reference camera in the horizontal direction, and y represents the number of pixels that the calibration camera is deflected by compared to the reference camera in the vertical direction; Based on the principle of three points and one plane, the optical axis direction of the correction camera is adjusted by changing the thickness of the adjustment gaskets connected in series between the three bosses and the corresponding waist holes at the correction camera; let the thickness of the adjustment gasket connected in series at the first boss be t1, the thickness of the adjustment gasket connected in series at the second boss be t2, the thickness of the adjustment gasket connected in series at the third boss be t3, and the distance between the centers of the two bosses be L, then the relationship between the thickness of the adjustment gasket and the adjustment direction of the optical axis is: Then the relationship between the thickness of the adjustment gasket, the optical axis adjustment angle, and the number of target moving pixels is calculated as follows: Among them, θ adjustment represents the camera adjustment angle, ρ adjustment Indicates that the camera adjusts the number of pixels. represents the camera adjustment direction, μ represents the pixel size of the calibration camera, and f represents the focal length of the calibration camera; by adjusting t1, t2, and t3 ρ adjustment =ρ, so that the optical axes of the calibration camera and the reference camera are pointed in the same direction.

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