Structured light sensor structure based on Chemmer's law

Abstract

The utility model relates to the technical field of light sensors, in particular to a structured light sensor structure based on the Gremer's law, which comprises an imaging part, a projector and a base, and is characterized in that the imaging part comprises a camera and an imaging lens, and the camera and the imaging lens are connected through a C port; the imaging part is fixedly connected with the base; the projector is composed of an optical machine body and a projection lens, and the projector and the installation bottom plate are locked through screws. According to the structured light sensor, the structure is based on the Gremer's law, and the independent wedge-shaped block is arranged at the joint of the projection lens, so that the brightness uniformity and the definition consistency of an obliquely projected pattern are kept, a high-quality image is shot, and the high precision of measurement is further ensured. The independent wedge-shaped block provides convenience for changing the projection angle and replacing the projection lens, and one projection light machine main body can be made into a projector with various projection distances and different magnification proportions to adapt to different applications.

Description

Technical Field

[0001] This utility model relates to the technical field of optical sensors, and in particular to a structured optical sensor structure based on Scham's law. Background Technology

[0002] Structured light sensors generally utilize the triangulation principle. A projector projects a pattern onto the surface of the object being measured, and a camera captures the distortion of the pattern on the object's surface. The resulting data is processed by a computer to obtain the height information of the object's surface. Typically, the lens axis of the projector in a structured light sensor forms a certain angle with the lens axis of the camera; the camera lens axis is perpendicular to the object being measured, and the projector tilts to project the pattern. This can lead to uneven sharpness and brightness in the projected pattern, affecting measurement accuracy. This can be addressed by using Scherm's law to design the projection lens axis to form a specific angle with the central axis of the projected light, ensuring uniform sharpness and brightness of the projected pattern.

[0003] Therefore, in order to solve the above problems, this utility model provides a structured light sensor structure based on Scham's law. Utility Model Content

[0004] To address the problems mentioned in the background art, this utility model provides a structured light sensor structure based on Scherm's law.

[0005] This utility model provides a structured light sensor structure based on Scherm's law, including an imaging part, a projector, and a base. The imaging part includes a camera and an imaging lens, which are connected via a USB-C port. The imaging part is fixedly connected to the base.

[0006] The projector consists of an optical engine body and a projection lens, and the projector and the mounting base are locked together by screws; the base is provided with a pin, and the four corners of the mounting base are respectively provided with four annular through holes centered on the pin.

[0007] Preferably, the axis of the imaging lens is perpendicular to the plane being measured, and is used to acquire a stripe image projected onto the plane being measured.

[0008] Preferably, a wedge block is provided between the projection lens and the optical engine body.

[0009] Preferably, the angle of the wedge block is obtained by calculating the angle of the projection using Scherm's law, so that the brightness of the pattern projected onto the plane is uniform from the near end to the far end, and the clarity remains consistent.

[0010] Preferably, the mounting base plate and the base are rotatably connected by a pin and an annular through hole.

[0011] In summary, this utility model has the following beneficial technical effects:

[0012] This utility model's structured light sensor is based on Scherm's law. An independent wedge block is set at the connection of the projection lens to ensure that the tilted projection pattern maintains uniform brightness and consistent clarity, thereby capturing high-quality images and ensuring high measurement accuracy.

[0013] Independent wedge blocks facilitate changing the projection angle and replacing the projection lens. A single projection optical engine can be made into projectors with different projection distances and magnification ratios to suit different applications.

[0014] The projector can rotate on the base and be adjusted to different projection angles, allowing one base to be adapted to multiple models. This simplifies material management, reduces inventory pressure, lowers production material preparation costs, and makes installation convenient. It also allows for quick model changes to meet different testing needs and improves production efficiency. Attached Figure Description

[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 projector structure in this utility model;

[0017] Figure 3 This is a structural diagram of the projector and mounting base plate in this utility model.

[0018] Explanation of reference numerals in the attached diagram: 1. Imaging part; 11. Camera; 12. Imaging lens; 2. Projector; 21. Optical engine body; 22. Projection lens; 23. Wedge block; 3. Mounting base plate; 31. Annular through hole; 4. Base; 5. Pin. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1 - Figure 3 The present invention will be described in further detail below.

[0020] Example:

[0021] A structured light sensor structure based on Scham's law, referring to Figure 1 - Figure 3 The system includes an imaging part 1, a projector 2, and a base 4. The imaging part 1 includes a camera 11 and an imaging lens 12, which are connected via a USB-C port. The imaging part 1 is fixedly connected to the base 4. The axis of the imaging lens 12 is perpendicular to the plane being measured and is used to acquire a stripe image projected onto the surface being measured.

[0022] The projector 2 consists of an optical engine body 21 and a projection lens 22. The projector 2 and the mounting base 3 are locked together by screws. The base 4 is provided with a pin 5, and four annular through holes 31 are respectively opened at the four corners of the mounting base 3 with the pin 5 as the center.

[0023] Reference Figure 1 - Figure 3 The mounting base 3 and the base 4 are rotatably connected by a pin 5 and an annular through hole 31, so that the mounting base 3 can rotate with the projector 2 at a small angle; a wedge block 23 is provided between the projection lens 22 and the optical engine body 21; the angle of the wedge block 23 is obtained by calculating the projection angle using Scherm's law, so that the brightness of the pattern projected onto the plane is uniform from the near end to the far end, and the clarity remains consistent.

[0024] Working principle: When the lens axis of a typical projection device is not perpendicular to the projection plane, the brightness and clarity of the pattern projected onto the plane are uneven; the brightness is higher at the near end of the projection and gradually decreases from near to far, resulting in inconsistent clarity of the entire pattern, which seriously affects the measurement accuracy.

[0025] The projector 2 used in this invention has an independent wedge block 23 between the projection lens 22 and the optical engine body 21. The angle of the wedge block 23 is obtained by calculating the projection angle using Scherm's law, so that the brightness of the pattern projected onto the plane is uniform from the near end to the far end, and the clarity remains consistent.

[0026] Since different measurement scenarios require different working distances, fields of view, and accuracy, in order to meet various testing needs more conveniently and quickly at a lower cost, the projector 2 can rotate at a small angle around the pin 5 of the mounting base 3. When changing the projection angle, only the appropriate wedge block 23 and projection lens 22 need to be replaced to meet different working distance and field of view requirements. The structure is simple and highly flexible.

[0027] The foregoing description, with reference to preferred embodiments, illustrates an exemplary implementation of a structured light sensor based on Scham's law provided by this disclosure. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, the protection scope of which is determined by the appended claims.

Claims

1. A structured light sensor structure based on Scherm's law, comprising an imaging part (1), a projector (2), and a base (4), characterized in that: The imaging part (1) includes a camera (11) and an imaging lens (12), which are connected via a C-port; the imaging part (1) is fixedly connected to the base (4); The projector (2) consists of an optical engine body (21) and a projection lens (22). The projector (2) and the mounting base (3) are locked together by screws. A pin (5) is provided on the base (4). Four annular through holes (31) are respectively opened at the four corners of the mounting base (3) with the pin (5) as the center.

2. The structured light sensor structure based on Scherum's law according to claim 1, characterized in that: The axis of the imaging lens (12) is perpendicular to the plane being measured, and is used to acquire a stripe image projected onto the plane being measured.

3. The structured light sensor structure based on Scherum's law according to claim 1, characterized in that: A wedge block (23) is provided between the projection lens (22) and the optical engine body (21).

4. The structured light sensor structure based on Scherum's law according to claim 3, characterized in that: The angle of the wedge block (23) is obtained by calculating the angle of the projection using Scham's law, so that the brightness of the pattern projected onto the plane is uniform from the near end to the far end, and the clarity remains consistent.

5. The structured light sensor structure based on Scherum's law according to claim 1, characterized in that: The mounting base plate (3) and the base (4) are rotatably connected by a pin (5) and an annular through hole (31).

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