Speckle structured light projection module and 3D depth camera

Abstract

The utility model discloses a speckle structured light projection module and a 3D depth camera, the speckle structured light projection module comprises a camera body, and the bottom of the camera body is provided with a projection assembly; the projection assembly comprises a projection frame fixedly mounted at the bottom of the camera body, and a switching frame is fixedly mounted on the front side of the projection frame; a switching plate and a random phase plate, the switching plate is rotatably installed in the switching frame, the rear side of the switching plate is provided with a placement groove, the random phase plate is clamped in the placement groove, and the random phase plate is at least used for applying random phase modulation to the light beam when the light beam passes through; the limiting structure is arranged between the projection frame and the switching frame. According to the utility model, through the projection assembly, a worker can conveniently carry out corresponding switching on the random phase plates according to requirements of different application scenes, so that the flexibility of the light projection module in use is improved.

Description

Technical Field

[0001] This utility model relates to the field of 3D topography measurement technology, specifically to a speckle structured light projection module and a 3D depth camera. Background Art

[0002] A 3D depth camera is a device that can capture the three-dimensional information of objects in a scene. It generates and projects a light beam with a specific pattern onto the target object through a speckle structured light projection module, and analyzes the reflected light to obtain the three-dimensional information of the object's surface. It is widely used in fields such as 3D scanning, machine vision, and biometrics.

[0003] The existing optical projection module consists of a projection frame, an array light source, a collimating lens, and a random phase plate. The array light source is fixedly installed inside the projection frame, the collimating lens is fixedly installed inside the projection frame, and a slot is opened on one side of the projection frame, with the random phase plate fixedly installed inside the slot.

[0004] Since the random phase plate within the projection frame cannot be switched, and different application scenarios have different requirements for the characteristics of the speckle pattern, staff need to use the corresponding random phase plate, which reduces the flexibility of the light projection module. Therefore, it is urgent to design a speckle structured light projection module and a 3D depth camera to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a speckle structured light projection module and a 3D depth camera to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] Includes a camera body, and a projection component is provided at the bottom of the camera body;

[0008] The projection assembly includes a projection frame fixedly installed at the bottom of the camera body, and a switching frame fixedly installed on the front side of the projection frame.

[0009] A switching plate and a random phase plate are provided. The switching plate is rotatably installed in the switching frame. A placement slot is provided on the rear side of the switching plate. The random phase plate is locked in the placement slot. The random phase plate is used at least to apply random phase modulation to the light beam when it passes through.

[0010] The system includes a limiting structure and a rotating structure. The limiting structure is disposed between the projection frame and the switching frame and is used at least to guide and limit the switching plate. The rotating structure is disposed on the front side of the switching frame and is used at least to drive the switching plate to rotate.

[0011] The projection component allows staff to easily switch between random phase plates according to the requirements of different application scenarios, thereby increasing the flexibility of the light projection module.

[0012] The limiting structure includes a sliding groove formed between the projection frame and the switching frame, a semi-circular protrusion slidably installed in the sliding groove, a first spring fixedly installed between the semi-circular protrusion and the projection frame, and a semi-circular groove formed on the rear side of the switching plate.

[0013] The rotating structure includes a fixed ring plate fixedly installed on the front side of the switching frame. A knob frame is rotatably installed on the outer surface of the fixed ring plate. A rotating groove is opened on the outer surface of the knob frame. A U-shaped clamping plate is slidably installed in the rotating groove. A second spring is fixedly installed between the U-shaped clamping plates. The knob frame is connected to the switching plate.

[0014] The bottom of the switching frame has a slot, and an arc-shaped cover plate is rotatably installed on the bottom of the switching frame. The outer surface of the arc-shaped cover plate is fixedly installed with a buckle.

[0015] An array of light sources is fixedly installed within the projection frame. The array of light sources is used to provide at least a laser beam. A collimating lens is fixedly installed within the projection frame. The collimating lens is used to modulate the laser beam emitted by the array of light sources into a collimated beam.

[0016] A through slot is provided between the projection frame and the switching frame, and a baffle is rotatably installed on the front side of the switching frame.

[0017] A 3D depth camera, including the aforementioned speckle structured light projection module.

[0018] In the above technical solution, the speckle structured light projection module and 3D depth camera provided by this utility model have the following beneficial effects:

[0019] 1. The projection component allows staff to easily switch between random phase plates according to the requirements of different application scenarios, thereby increasing the flexibility of the optical projection module.

[0020] 2. The limiting structure can guide and limit the switching plate, so that the random phase plate corresponds to the collimating lens, thereby improving the performance of the optical projection module.

[0021] 3. The rotating structure can drive the switching plate to rotate while limiting and fixing it, thereby improving the stability of the light projection module during use. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a schematic diagram of the 3D depth camera structure provided for an embodiment of a speckle structured light projection module and a 3D depth camera according to the present invention.

[0024] Figure 2 This is a schematic diagram of the optical projection module structure provided in an embodiment of a speckle structured light projection module and a 3D depth camera according to the present invention.

[0025] Figure 3 This is a schematic diagram of the switching frame structure provided in an embodiment of a speckle structured light projection module and a 3D depth camera according to the present invention.

[0026] Figure 4 This is a schematic diagram of the rotating structure provided in an embodiment of a speckle structured light projection module and a 3D depth camera according to the present invention.

[0027] 1. Camera body; 2. Projection assembly; 3. Projection frame; 4. Switching frame; 5. Switching plate; 6. Random phase plate; 7. Placement slot; 8. Limiting structure; 9. Rotation structure; 10. Slide groove; 11. Semicircular protrusion; 12. First spring; 13. Semicircular groove; 14. Fixing ring plate; 15. Knob frame; 16. Rotating groove; 17. U-shaped clamping plate; 18. Second spring; 19. Groove; 20. Arc-shaped cover plate; 21. Buckle; 22. Array light source; 23. Collimating lens; 24. Through groove; 25. Baffle. DETAILED DESCRIPTION

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-4As shown in the figure, the present invention provides a speckle structured light projection module, including a camera body 1, a projection component 2 disposed at the bottom of the camera body 1; the projection component 2 includes a projection frame 3 fixedly installed at the bottom of the camera body 1, a switching frame 4 fixedly installed at the front side of the projection frame 3; a switching plate 5 and a random phase plate 6, the switching plate 5 being rotatably installed in the switching frame 4, a placement groove 7 being opened at the rear side of the switching plate 5, the random phase plate 6 being engaged in the placement groove 7, the random phase plate 6 being used at least to apply random phase modulation to the light beam when it passes through; a limiting structure 8 and a rotating structure 9, the limiting structure 8 being disposed between the projection frame 3 and the switching frame 4, the limiting structure 8 being used at least to guide and limit the switching plate 5, the rotating structure 9 being disposed at the front side of the switching frame 4, the rotating structure 9 being used at least to drive the switching plate 5 to rotate.

[0030] In this embodiment, a camera body 1 is included, and a projection component 2 is provided at the bottom of the camera body 1. The projection component 2 enables the staff to switch the random phase plate 6 according to the requirements of different application scenarios, thereby increasing the flexibility of the light projection module when it is used.

[0031] In this embodiment, the projection component 2 includes a projection frame 3 that is fixedly installed at the bottom of the camera body 1;

[0032] Specifically, an array light source 22 is fixedly installed inside the projection frame 3. The array light source 22 is used to provide at least a laser beam. A collimating lens 23 is fixedly installed inside the projection frame 3. The collimating lens 23 is used to modulate the laser beam emitted by the array light source 22 into a collimated beam.

[0033] In this embodiment, a switching frame 4 is fixedly installed on the front side of the projection frame 3;

[0034] Specifically, the bottom of the switching frame 4 has a slot 19, and an arc-shaped cover plate 20 is rotatably installed on the bottom of the switching frame 4. A buckle 21 is fixedly installed on the outer surface of the arc-shaped cover plate 20.

[0035] Specifically, a through slot 24 is provided between the projection frame 3 and the switching frame 4, and a baffle 25 is rotatably installed on the front side of the switching frame 4.

[0036] In this embodiment, the switching plate 5 and the random phase plate 6 are rotatably installed in the switching frame 4. The switching plate 5 has a placement slot 7 on its rear side, and the random phase plate 6 is locked in the placement slot 7. The random phase plate 6 is used at least to apply random phase modulation to the beam when it passes through.

[0037] In this embodiment, a limiting structure 8 is disposed between the projection frame 3 and the switching frame 4. The limiting structure 8 is used at least to guide and limit the switching plate 5.

[0038] Specifically, the limiting structure 8 includes a slide groove 10 between the projection frame 3 and the switching frame 4, a semi-circular protrusion 11 is slidably installed in the slide groove 10, a first spring 12 is fixedly installed between the semi-circular protrusion 11 and the projection frame 3, and a semi-circular groove 13 is provided on the rear side of the switching plate 5. The limiting structure 8 can guide and limit the switching plate 5, so that the random phase plate 6 corresponds to the collimating lens 23, thereby improving the use effect of the light projection module.

[0039] In this embodiment, the rotating structure 9 is disposed on the front side of the switching frame 4, and the rotating structure 9 is at least used to drive the switching plate 5 to rotate.

[0040] Specifically, the rotating structure 9 includes a fixed ring plate 14 fixedly installed on the front side of the switching frame 4. A knob frame 15 is rotatably installed on the outer surface of the fixed ring plate 14. A rotating groove 16 is opened on the outer surface of the knob frame 15. A U-shaped clamping plate 17 is slidably installed in the rotating groove 16. A second spring 18 is fixedly installed between the U-shaped clamping plates 17. The knob frame 15 is connected to the switching plate 5. The rotating structure 9 can drive the switching plate 5 to rotate while limiting and fixing it, thereby improving the stability of the light projection module during use.

[0041] A 3D depth camera, including a speckle structured light projection module.

[0042] Working steps: 1. Release the locking clip 21 to limit and fix the arc-shaped cover plate 20 and the switching frame 4 and open the arc-shaped cover plate 20;

[0043] 2. Hold the knob frame 15 and press the U-shaped plate 17. The U-shaped plate 17 presses the second spring 18, so that the U-shaped plate 17 releases the limiting fixation between the fixing ring plate 14 and the knob frame 15. Rotate the knob frame 15 to drive the switching plate 5 to rotate and replace the random phase plate 6 in the placement slot 7.

[0044] 3. After the random phase plate 6 is replaced, refer to the above steps, close the arc-shaped cover plate 20 and use the buckle 21 to limit and fix it;

[0045] IV. According to the actual requirements of the application scenario, referring to the above steps, rotate the knob frame 15 to drive the switching plate 5 to rotate. The first spring 12 squeezes the semi-circular protrusion 11, so that it guides and limits the switching plate 5 through the semi-circular groove 13. The switching plate 5 drives the random phase plate 6 to move and switch it.

[0046] 5. After the random phase plate 6 has switched, the array light source 22 is activated and its laser beam is irradiated onto the target object through the collimating lens 23 and the random phase plate 6 to form a speckle pattern. The collimating lens 23 modulates the laser beam into a collimated beam, and the random phase plate 6 applies random phase modulation to the laser beam as it passes through. The camera body 1 is used to capture the speckle pattern projected onto the object.

[0047] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A speckle structured light projection module, comprising a camera body (1), characterized in that, A projection component (2) is provided at the bottom of the camera body (1); The projection assembly (2) includes a projection frame (3) fixedly installed at the bottom of the camera body (1), and a switching frame (4) is fixedly installed on the front side of the projection frame (3); A switching plate (5) and a random phase plate (6) are provided. The switching plate (5) is rotatably installed in the switching frame (4). A placement slot (7) is provided on the rear side of the switching plate (5). The random phase plate (6) is installed in the placement slot (7). The random phase plate (6) is used at least to apply random phase modulation to the beam when it passes through. The limiting structure (8) and the rotating structure (9) are provided. The limiting structure (8) is disposed between the projection frame (3) and the switching frame (4). The limiting structure (8) is used at least to guide and limit the switching plate (5). The rotating structure (9) is disposed on the front side of the switching frame (4). The rotating structure (9) is used at least to drive the switching plate (5) to rotate.

2. The speckle structured light projection module according to claim 1, characterized in that, The limiting structure (8) includes a groove (10) formed between the projection frame (3) and the switching frame (4), a semi-circular protrusion (11) is slidably installed in the groove (10), a first spring (12) is fixedly installed between the semi-circular protrusion (11) and the projection frame (3), and a semi-circular groove (13) is formed on the rear side of the switching plate (5).

3. The speckle structured light projection module according to claim 1, characterized in that, The rotating structure (9) includes a fixed ring plate (14) fixedly installed on the front side of the switching frame (4). A knob frame (15) is rotatably installed on the outer surface of the fixed ring plate (14). A rotating groove (16) is opened on the outer surface of the knob frame (15). A U-shaped card plate (17) is slidably installed in the rotating groove (16). A second spring (18) is fixedly installed between the U-shaped card plates (17). The knob frame (15) is connected to the switching plate (5).

4. A speckle structured light projection module according to claim 1, characterized in that, The switching frame (4) has a slot (19) at the bottom, and an arc-shaped cover plate (20) is rotatably installed at the bottom of the switching frame (4). A buckle (21) is fixedly installed on the outer surface of the arc-shaped cover plate (20).

5. A speckle structured light projection module according to claim 1, characterized in that, An array light source (22) is fixedly installed inside the projection frame (3). The array light source (22) is used to provide at least a laser beam. A collimating lens (23) is fixedly installed inside the projection frame (3). The collimating lens (23) is used to modulate the laser beam emitted by the array light source (22) into a collimated beam.

6. A speckle structured light projection module according to claim 1, characterized in that, A through slot (24) is provided between the projection frame (3) and the switching frame (4), and a baffle (25) is rotatably installed on the front side of the switching frame (4).

7. A 3D depth camera, comprising a speckle structured light projection module as described in any one of claims 1-6.

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