A projector ranging tof calibration workbench

Abstract

The utility model discloses a kind of projector ranging TOF calibration workbench, belong to projector calibration equipment technical field, including support frame and fixed in the light shield shell of support frame surface, the inner wall of the light shield shell is provided with light-absorbing layer, the bottom wall of the inner chamber of the light shield shell is equipped with mounting groove, and linear reciprocating motor is installed in mounting groove, the driving end of the linear reciprocating motor is installed with jig base, the side outer wall of the jig base is installed with stepper motor, the output of the stepper motor is fixed with support seat, projector main body is placed on the surface of the support seat, and the surface of support seat movably connects two clamping plates for clamping projector main body, moving groove is equipped on the bottom plate of the light shield shell, and operating door is movably connected in moving groove. The projector ranging TOF calibration workbench can efficiently complete the accurate calibration of TOF board, improve the projection accuracy of projector, and is convenient to operate, suitable for industrial production line scene.

Description

Technical Field

[0001] This utility model belongs to the technical field of projector calibration equipment, specifically relating to a projector ranging TOF calibration workbench. Background Technology

[0002] In the field of projector technology, the TOF (Time-of-Flight) board is a core component for achieving accurate distance measurement, and its distance measurement accuracy directly determines the projection effect of the projector. However, during production, assembly, and actual use, the TOF board is susceptible to multiple factors that can lead to distance measurement deviations: on the one hand, mechanical installation errors and internal structural stress may cause the TOF board to tilt, resulting in an angular shift in the collected depth information; on the other hand, external stray light interference can severely interfere with the optical signal reception of the TOF board, causing depth signal distortion, which in turn leads to positional shifts, shape distortion, or decreased clarity of the projected image.

[0003] Traditional TOF calibration equipment has significant limitations: most rely on a fixed laboratory environment, lack effective light-shielding structures, make it difficult to eliminate stray light interference, and result in poor calibration data stability; angle adjustment is mostly manual mechanical adjustment, which has low precision and is cumbersome to operate, and cannot adapt to the multi-angle calibration needs of different projector models. Utility Model Content

[0004] The purpose of this invention is to provide a TOF calibration workbench for projectors, in order to solve the problems mentioned in the background art, such as the lack of an effective light-shielding structure in traditional TOF calibration equipment, and the fact that angle adjustment is mostly manual mechanical adjustment, which is low in accuracy and cumbersome to operate.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a projector ranging TOF calibration workbench, comprising a support frame and a light-shielding shell fixed to the surface of the support frame. The inner wall of the light-shielding shell is provided with a light-absorbing layer. The bottom wall of the inner cavity of the light-shielding shell is provided with a mounting groove, and a linear reciprocating motor is installed in the mounting groove. A jig base is installed at the drive end of the linear reciprocating motor. A stepper motor is installed on one outer wall of the jig base. A support base is fixed at the output end of the stepper motor. A projector body is placed on the surface of the support base, and two clamping plates for holding the projector body are movably connected to the surface of the support base. A moving groove is provided on the bottom plate of the light-shielding shell, and an operating door is movably connected in the moving groove.

[0006] In a further embodiment, two electric telescopic rods are symmetrically installed on the bottom wall of the inner cavity of the support base. The output end of the electric telescopic rod is fixed with a connecting block that is fixedly connected to the clamping plate. Two limiting grooves for the connecting block to move are symmetrically opened on the surface of the support base.

[0007] In a further embodiment, a connecting plate is fixed inside the support frame, a fixing box is installed on the surface of the connecting plate, and a drive motor is installed on the bottom wall of the inner cavity of the fixing box.

[0008] In a further embodiment, a lifting screw is fixed to the output end of the drive motor, and a guide block that is fixedly connected to the operating door is threaded onto the outer wall of the lifting screw.

[0009] In a further embodiment, the operating door is provided with an observation window, which is made of light-blocking glass.

[0010] The technical effects and advantages of this utility model are as follows:

[0011] This projector-based TOF calibration workbench features a light-shielding outer shell and an inner light-absorbing layer (black foam or nano-light-absorbing material) that effectively isolates external stray light and absorbs internal reflected light, providing a near-light-free pure testing environment for the TOF board. This reduces ranging deviations caused by optical interference and ensures the accuracy of calibration data.

[0012] A linear reciprocating motor drives the jig base to move, enabling precise distance adjustment. A stepper motor drives the support base to rotate, allowing for precise adjustment of the projector's main body angle, adapting to the multi-angle calibration needs of different projector TOF boards.

[0013] The coordinated operation of linear reciprocating motors, stepper motors, electric telescopic rods, and drive motors (controlling the lifting and lowering of the operating door) enables automated control of distance adjustment, angle adjustment, workpiece fixing, and operating door opening and closing, reducing manual intervention, shortening the calibration time of a single device, and adapting to batch calibration scenarios in industrial production lines. This projector ranging TOF calibration workbench can efficiently complete the accurate calibration of TOF boards, improve the projection accuracy of the projector, and is easy to operate, making it suitable for industrial production line scenarios. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the operating door of this utility model in the closed state;

[0017] Figure 3This is a schematic diagram of the structure of the fixture base and the projector body of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the electric telescopic rod and clamping plate of this utility model;

[0019] Figure 5 This is a cross-sectional view of the fixing box of this utility model.

[0020] In the diagram: 1. Support frame; 2. Light-shielding shell; 3. Light-absorbing layer; 4. Linear reciprocating motor; 5. Fixture base; 6. Stepper motor; 7. Support base; 8. Projector body; 9. Electric telescopic rod; 10. Connecting block; 11. Clamping plate; 12. Connecting plate; 13. Fixing box; 14. Drive motor; 15. Lifting screw; 16. Guide block; 17. Operating door; 18. Observation window. Detailed Implementation

[0021] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0022] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0023] This utility model provides, for example Figure 1-5 The projector ranging TOF calibration workbench shown includes a support frame 1 and a light-shielding shell 2 fixed to the surface of the support frame 1. The light-shielding shell 2 is made of metal and has good structural stability. The inner wall of the light-shielding shell 2 is provided with a light-absorbing layer 3, which is made of black foam or nano light-absorbing material, which can absorb internal light to the maximum extent and avoid reflection interference. The bottom wall of the inner cavity of the light-shielding shell 2 is provided with a mounting groove, and a linear reciprocating motor 4 is installed in the mounting groove. A jig base 5 is installed at the drive end of the linear reciprocating motor 4. A stepper motor 6 is installed on one outer wall of the jig base 5. A support seat 7 is fixed at the output end of the stepper motor 6. A rotating column is fixed on the outer wall of the support seat 7 away from the stepper motor 6. The rotating column is rotatably connected to the jig base 5 through a bearing, thereby ensuring the stability of the support seat 7. The projector body 8 is placed on the surface of the support seat 7. When the stepper motor 6 works, it can drive the support seat 7 to rotate and adjust the angle of the projector body 8 to adapt to the calibration requirements of different angles.

[0024] The support base 7 has two movably connected clamping plates 11 for holding the projector body 8. Two electrically operated telescopic rods 9 are symmetrically installed on the bottom wall of the inner cavity of the support base 7. The output end of each electric telescopic rod 9 is fixed with a connecting block 10 that is fixedly connected to the clamping plates 11. Two symmetrically opened limiting grooves on the surface of the support base 7 allow the connecting blocks 10 to move. The electric telescopic rods 9 drive the connecting blocks 10 and clamping plates 11 to move, causing the clamping plates 11 to clamp the projector body 8 on both sides, enabling quick fixation of the projector body 8. A protective pad is installed on the side of the clamping plate 11 facing the projector body 8 to provide protection. The tool is used to move the fixture base 5 via a linear reciprocating motor 4 to adjust the actual distance between the TOF plate of the projector body 8 and the reference point on the inner wall of the light-shielding shell 2. A host computer (not shown in the figure) is set on the outside of the workbench. The projector body 8 is equipped with an interface for connecting to the host computer. It communicates with the host computer via a USB interface or an Ethernet interface. The host computer is equipped with the algolib algorithm library. The calibration process is started by calling the algorithm library through the host computer connection interface, receiving the distance measurement signal of the TOF plate, calculating the difference of multiple tests, and correcting the TOF distance measurement through the algorithm to complete the calibration.

[0025] The bottom plate of the light-shielding housing 2 has a movable groove, and the operating door 17 is movably connected in the movable groove. The support frame 1 has a connecting plate 12 fixed inside. The surface of the connecting plate 12 is equipped with a fixed box 13. The bottom wall of the inner cavity of the fixed box 13 is equipped with a drive motor 14. The output end of the drive motor 14 is fixed with a lifting screw 15. The top of the lifting screw 15 is rotatably connected to the top plate of the fixed box 13 through a bearing, thereby ensuring the stability of the lifting screw 15 when rotating. The outer wall of the lifting screw 15 is threadedly connected with a guide block 16 that is fixedly connected to the operating door 17. The outer wall of the fixed box 13 facing the operating door 17 has a guide groove for the guide block 16 to move. The operating door 17 is equipped with an observation window 18, which is made of light-shielding glass, which facilitates observation of the internal calibration and prevents external light from entering.

[0026] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The control method of this utility model is through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0027] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Working principle:

[0029] The projector's TOF calibration workbench is used to ensure that the equipment is placed stably. The drive motor 14 drives the lifting screw 15 to rotate, causing the guide block 16 to move along the guide groove of the fixed box 13, thereby opening the operation door 17. The projector body 8 to be calibrated is placed on the surface of the support base 7. The electric telescopic rod 9 is activated, driving the connecting block 10 to move along the limiting groove, causing the two clamping plates 11 to move closer to each other until the projector body 8 is firmly clamped. The operation door 17 is then closed, and the drive motor 14 reverses its operation to close the operation door 17, forming a closed darkroom environment.

[0030] The linear reciprocating motor 4 drives the fixture base 5 to move along the mounting groove, adjusting the actual distance between the TOF plate of the projector body 8 and the reference point on the inner wall of the light-shielding shell 2. Once in position, the distance stops. According to the calibration requirements, the stepper motor 6 is started to drive the support base 7 to rotate, adjusting the angle of the projector body 8 to ensure that the TOF plate is at the angle to be calibrated. The projector body 8 is then connected to the host computer, which calls the algolib algorithm library to start the calibration process, controlling the TOF plate to perform multiple distance measurement tests. The host computer receives the actual distance data and the TOF distance measurement data, calculates the difference, and corrects the TOF distance measurement parameters through the algorithm. After calibration, the drive motor 14 works again to open the operation door 17, and the electric telescopic rod 9 drives the clamp 11 to reset, allowing the calibrated projector body 8 to be taken out, thus completing the entire calibration process.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A projector ranging TOF calibration workbench, comprising a support frame (1) and a light-shielding shell (2) fixed to the surface of the support frame (1), characterized in that: The inner wall of the light-shielding shell (2) is provided with a light-absorbing layer (3). The bottom wall of the inner cavity of the light-shielding shell (2) is provided with an installation groove, and a linear reciprocating motor (4) is installed in the installation groove. A jig base (5) is installed at the drive end of the linear reciprocating motor (4). A stepper motor (6) is installed on one side of the outer wall of the jig base (5). A support base (7) is fixed at the output end of the stepper motor (6). The projector body (8) is placed on the surface of the support base (7), and two clamping plates (11) for clamping the projector body (8) are movably connected to the surface of the support base (7). A moving groove is provided on the bottom plate of the light-shielding shell (2), and an operating door (17) is movably connected in the moving groove.

2. The projector ranging TOF calibration workbench according to claim 1, characterized in that: Two electric telescopic rods (9) are symmetrically installed on the bottom wall of the inner cavity of the support base (7). The output end of the electric telescopic rod (9) is fixed with a connecting block (10) that is fixedly connected to the clamping plate (11). Two limiting grooves for the connecting block (10) to move are symmetrically opened on the surface of the support base (7).

3. The projector ranging TOF calibration workbench according to claim 1, characterized in that: A connecting plate (12) is fixed inside the support frame (1), and a fixing box (13) is installed on the surface of the connecting plate (12). A drive motor (14) is installed on the bottom wall of the inner cavity of the fixing box (13).

4. A projector ranging TOF calibration workbench according to claim 3, characterized in that: The output end of the drive motor (14) is fixed with a lifting screw (15), and the outer wall of the lifting screw (15) is threaded with a guide block (16) that is fixedly connected to the operating door (17).

5. A projector ranging TOF calibration workbench according to claim 4, characterized in that: The operating door (17) is provided with an observation window (18), which is made of light-blocking glass.

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