Laser displacement sensor and electronic equipment

Abstract

The utility model discloses a laser displacement sensor and an electronic device, and relates to the technical field of automatic detection, the laser displacement sensor comprises a circuit board, a laser head, a lens and an image sensor, the laser head and the lens are both installed on a first side of the circuit board and are arranged at intervals in a second direction; the image sensor is located at one end of the lens facing the circuit board and is welded with the circuit board. The end faces of the laser head and the lens are directly pressed or attached to the circuit board, deviation of the installation angle is avoided, the laser sensor only comprises electronic devices such as the circuit board, the laser head, the lens and the image sensor, the number of the electronic devices is small, installation is easy, and the electronic devices are widely applied to common mobile phones and monitoring equipment, so that the cost is reduced. The laser displacement sensor belongs to a common electronic device, is large in yield and wide in application, so that the technology is mature and stable, the cost is low, and the laser displacement sensor is low in cost and easy to produce.

Description

Technical Field

[0001] This utility model relates to the field of automatic detection technology, and in particular to a laser displacement sensor and electronic device. Background Technology

[0002] Displacement sensors are widely used in various electronic products and industrial applications due to their high precision, non-contact measurement capabilities, and fast response.

[0003] In the existing technology, displacement sensors can only be used in laser displacement modules and require customization, so the production volume is not large, resulting in a high price. In addition, the displacement sensors in the existing technology contain multiple optical components, which require extremely high positioning accuracy for installation and placement. Even a deviation of only a few micrometers can lead to serious accuracy loss. This results in high overall product assembly and manufacturing costs, low yield, and poor quality control consistency. Utility Model Content

[0004] The main objective of this invention is to provide a laser displacement sensor and electronic device, which aims to offer a low-cost and easy-to-manufacture laser displacement sensor.

[0005] To achieve the above objectives, the laser displacement sensor proposed in this utility model includes:

[0006] A circuit board having a first side and a second side disposed opposite to each other in a first direction;

[0007] A laser head is mounted on the first side of the circuit board, and the laser head includes a laser diode soldered to the circuit board;

[0008] A lens is mounted on a first side of the circuit board and spaced apart from the laser head in a second direction; and,

[0009] An image sensor is located at the end of the lens facing the circuit board and is soldered to the circuit board.

[0010] In one embodiment, both the laser head and the lens extend along the first direction.

[0011] In one embodiment, the laser head has a first axis extending along the first direction, the lens has a second axis extending along the first direction, and the image sensor has a central axis extending along the second direction, which is coplanar or parallel to the first axis and the second axis.

[0012] In one embodiment, the image sensor includes a CMOS sensor or a CCD sensor; and / or,

[0013] The wavelength of the laser diode is set to be greater than or equal to 630nm and less than or equal to 670nm.

[0014] In one embodiment, the laser displacement sensor further includes a mounting base mounted on the circuit board. The mounting base has a through hole along the first direction corresponding to the image sensor. The lens is mounted on the side of the mounting base corresponding to the through hole and away from the circuit board. The mounting base is screwed or snapped onto the circuit board.

[0015] In one embodiment, the lens is detachably connected to the mounting base.

[0016] In one embodiment, one of the lens and the mounting base is provided with an internal thread, and the other is provided with an external thread that is screwed into the internal thread.

[0017] In one embodiment, the laser displacement sensor further includes a USB conversion chip, which is soldered to the circuit board and electrically connected to the image sensor.

[0018] In one embodiment, the USB conversion chip is disposed on the second side of the circuit board.

[0019] This utility model also proposes an electronic device, which includes a laser displacement sensor, the laser displacement sensor comprising:

[0020] A circuit board having a first side and a second side disposed opposite to each other in a first direction;

[0021] A laser head is mounted on the first side of the circuit board, and the laser head includes a laser diode soldered to the circuit board;

[0022] A lens is mounted on a first side of the circuit board and spaced apart from the laser head in a second direction; and,

[0023] An image sensor is located at the end of the lens facing the circuit board and is soldered to the circuit board.

[0024] In the technical solution of this utility model, the laser head and the lens are provided on the first side of the circuit board, and the image sensor is soldered to the circuit board. The end faces of the laser head and the lens are directly pressed or attached to the circuit board to avoid deviations in the installation angle. Furthermore, the laser sensor only includes electronic components such as the circuit board, the laser head, the lens, and the image sensor. The number of electronic components is small, and the installation is simple. These electronic components are widely used in general mobile phones and monitoring equipment. They are common electronic components with large production volume and wide application. Therefore, the technology is mature and stable, and the cost is low, so as to provide a low-cost and easy-to-produce laser displacement sensor. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the structure of an embodiment of the laser displacement sensor provided by this utility model;

[0027] Figure 2 for Figure 1 A partial structural diagram of a laser displacement sensor;

[0028] Figure 3 This is a schematic diagram from another perspective of the laser displacement sensor provided by this utility model.

[0029] Explanation of icon numbers:

[0030] 100. Laser displacement sensor; 1. Circuit board; 11. First side; 12. Second side; 2. Laser head; 3. Lens; 4. Image sensor; 5. Mounting base; 6. USB conversion chip.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] In the existing technology, displacement sensors can only be used in laser displacement modules and require customization, so the production volume is not large, resulting in a high price. In addition, the displacement sensors in the existing technology contain multiple optical components, which require extremely high positioning accuracy for installation and placement. Even a deviation of only a few micrometers can lead to serious accuracy loss. This results in high overall product assembly and manufacturing costs, low yield, and poor quality control consistency.

[0036] This utility model proposes a laser displacement sensor 100, which aims to provide a low-cost and easy-to-manufacture laser displacement sensor. Figure 1 A schematic diagram of the structure of an embodiment of the laser displacement sensor provided by this utility model; Figure 2 for Figure 1 A partial structural diagram of a laser displacement sensor; Figure 3 This is a schematic diagram from another perspective of the laser displacement sensor provided by this utility model.

[0037] Please see Figure 1 In one embodiment of this utility model, the laser displacement sensor 100 includes a circuit board 1, a laser head 2, a lens 3, and an image sensor 4. The circuit board 1 has a first side 11 and a second side 12 that are arranged opposite to each other in a first direction. The laser head 2 is mounted on the first side 11 of the circuit board 1 and includes a laser diode soldered to the circuit board 1. The lens 3 is mounted on the first side 11 of the circuit board 1 and is spaced apart from the laser head 2 in a second direction. The image sensor 4 is located at the end of the lens 3 facing the circuit board 1 and is soldered to the circuit board 1.

[0038] It should be noted that the circuit board 1 is a flat board used to mount and connect various electronic components. The circuit board 1 has two opposing sides, a first side 11 and a second side 12. The "first direction" refers to the thickness direction of the circuit board 1, while the "second direction" refers to the length or width direction of the circuit board 1.

[0039] The laser head 2 is mounted on the first side 11 of the circuit board 1. The laser diode is the core component of the laser head 2 and is used to generate a laser beam.

[0040] The lens 3 is also mounted on the first side 11 of the circuit board 1, and is spaced a certain distance from the laser head 2 in the length or width direction of the circuit board 1. The function of the lens 3 is to focus the reflected laser spot onto the image sensor 4. The position of the lens 3 is offset from that of the laser head 2 to ensure that the laser spot reflected from the liquid surface can be captured.

[0041] The image sensor 4 is located at the end of the lens 3 facing the circuit board 1 and is soldered to the circuit board 1. The image sensor 4 is used to capture the light spot focused by the lens 3 and convert it into an electrical signal. By analyzing the position of the light spot on the image sensor 4, the offset of the light spot relative to the sensor can be calculated. Based on the change in the light spot offset, combined with known geometric parameters (such as the distance between the laser head 2 and the lens 3, the focal length of the lens 3, etc.), the height change of the liquid surface relative to the reference point can be calculated.

[0042] It should be noted that the measurement steps of the laser displacement sensor 100 are as follows:

[0043] Calibration: Before starting the measurement, the entire system needs to be calibrated to determine the relative positional relationship between the laser head 2, the lens 3 and the image sensor 4, as well as the mathematical relationship between the spot offset and the actual liquid level change.

[0044] Spot position recognition: In the image processing stage, it is necessary to accurately identify the position of the spot on the image sensor 4, which is usually achieved through image processing algorithms such as edge detection and threshold segmentation.

[0045] Liquid level calculation: Based on the mathematical model obtained from the calibration and combined with the position information of the light spot, the change in liquid level is calculated.

[0046] By vertically irradiating the liquid surface with a laser beam, the reflected light can be captured by lens 3 and focused onto image sensor 4, thereby achieving non-contact measurement of the liquid level.

[0047] In the technical solution of this utility model, the first side 11 of the circuit board 1 is provided with the laser head 2 and the lens 3. The image sensor 4 is soldered to the circuit board 1. The end faces of the laser head 2 and the lens 3 are directly pressed or attached to the circuit board 1 to avoid deviation of the installation angle. Furthermore, the laser sensor only includes electronic components such as the circuit board 1, the laser head 2, the lens 3, and the image sensor 4. The number of electronic components is small and the installation is simple. These electronic components are widely used in general mobile phones and monitoring equipment. They are common electronic components with large output and wide use. Therefore, the technology is mature and stable and the cost is low, so a low-cost and easy-to-produce laser displacement sensor 100 is provided.

[0048] Specifically, both the laser head 2 and the lens 3 extend along the first direction. That is, both the laser head 2 and the lens 3 are perpendicular to the circuit board 1.

[0049] It is understood that, in order to ensure that the reflected light spot can form a clear image on the image sensor 4, in this embodiment, the laser head 2 has a first axis extending along the first direction, the lens 3 has a second axis extending along the first direction, and the image sensor 4 has a central axis extending along the second direction, which is coplanar or parallel to the first axis and the second axis.

[0050] It should be noted that the first axis is the central axis of the laser head 2, that is, the direction of laser emission; the second axis is the central axis of the lens 3, that is, the optical axis of the lens 3; and the central axis of the image sensor 4 refers to the central symmetry line of the image sensor 4.

[0051] The central axis of the image sensor 4 is coplanar with the first axis of the laser head 2 and the second axis of the lens 3, meaning these axes are on the same plane; or the central axis of the image sensor 4 is parallel to the first axis of the laser head 2 and the second axis of the lens 3. This arrangement ensures that the laser beam can be perpendicularly irradiated onto the liquid surface, and the reflected light can be captured by the lens 3 and focused onto the image sensor 4, thereby achieving non-contact measurement of the liquid level. By ensuring that the axes of the laser head 2, the lens 3, and the image sensor 4 are on the same plane, more accurate alignment and more stable liquid level measurement can be achieved, thereby improving the overall accuracy and reliability of the system.

[0052] Specifically, in this embodiment, the image sensor 4 includes a CMOS sensor or a CCD sensor.

[0053] A CMOS (Complementary Metal-Oxide-Semiconductor) sensor is an image sensor based on complementary metal-oxide-semiconductor technology. CMOS sensors have advantages such as low power consumption, high integration, and relatively low cost.

[0054] In the image sensor 4 of CCD (Charge-Coupled Device) sensor, there is a charge storage area on each pixel. The charge accumulates over time and is transferred during readout. CCD sensor has the advantages of high image quality and low noise.

[0055] It should be noted that when performing liquid level detection, especially in resin level detection in 3D printers, shorter wavelengths of visible light (such as blue or violet light) are typically absorbed by most transparent or translucent liquid resins, while longer wavelengths (such as red light) may have better penetration. However, for liquid level measurement, in order for the laser to penetrate the liquid only to a certain depth, a clear reflected signal needs to be formed on the surface.

[0056] In this embodiment, the wavelength of the laser diode is set to be greater than or equal to 630 nm and less than or equal to 670 nm. For most resin materials, red laser wavelengths between 630 nm and 670 nm are suitable because these wavelengths can form good reflections on the resin surface without being strongly absorbed by the resin. Preferably, the wavelength of the laser diode is set to around 650 nm.

[0057] In this embodiment, the laser displacement sensor 100 further includes a mounting base 5 mounted on the circuit board 1. The mounting base 5 has a through hole corresponding to the image sensor 4 along the first direction. The lens 3 is mounted on the side of the mounting base 5 corresponding to the through hole and away from the circuit board 1. The mounting base 5 is screwed or snapped to the circuit board 1.

[0058] The mounting base 5 is mounted on the circuit board 1 to fix the position of the lens 3 and ensure alignment between the lens 3 and the image sensor 4. The mounting base 5 has a through hole along the thickness direction of the circuit board 1 so that reflected light, after passing through the lens 3, can be projected onto the image sensor 4 through the through hole.

[0059] The mounting base 5 is screwed to the circuit board 1, that is, the mounting base 5 is fixed to the circuit board 1 with screws, providing a stable connection.

[0060] The mounting base 5 is snapped onto the circuit board 1, that is, the mounting base 5 is fixed onto the circuit board 1 by means of a snap-fit ​​or other structure, which facilitates installation and disassembly.

[0061] The mounting base 5 is used to fix the position of the lens 3, ensuring alignment between the lens 3 and the image sensor 4. The mounting base 5 and the circuit board 1 can be connected by screws or clips to ensure stable installation and easy maintenance. In this way, it can be ensured that the various components of the laser displacement sensor 100 can work accurately and collaboratively to achieve non-contact measurement of liquid level.

[0062] In this embodiment, the lens 3 is detachably connected to the mounting base 5. This detachable connection can be achieved in various ways, commonly including threaded connections, snap-fit ​​connections, and magnetic connections. Thus, by detachably mounting the lens 3 to the mounting base 5, when the lens 3 needs to be replaced, it is not necessary to replace the entire laser displacement sensor 100, reducing the cost of replacing or maintaining the laser displacement sensor 100.

[0063] Specifically, in this embodiment, one of the lens 3 and the mounting base 5 is provided with an internal thread, and the other is provided with an external thread that screws into the internal thread. Specifically, the lens 3 and the mounting base 5 are connected by an M12 thread or an M9 thread. In this way, the assembly between the lens 3 and the mounting base 5 is achieved by a threaded connection, which is simple in structure and convenient in operation.

[0064] Furthermore, in this embodiment, the laser displacement sensor 100 also includes a USB conversion chip 6, which is soldered to the circuit board 1 and electrically connected to the image sensor 4.

[0065] It should be noted that the USB conversion chip 6 is electrically connected to the image sensor 4, and is used to convert the image data captured by the image sensor 4 into a USB protocol data format, and package the image data into a data packet conforming to the USB protocol, so as to transmit it to an external device through the USB interface. The USB socket is electrically connected to the USB conversion chip 6, and is used to provide a physical interface for connecting a USB cable and establishing communication with an external device.

[0066] This setup enables USB transmission of image data, allowing the data captured by the image sensor 4 to be transmitted to an external device for processing. Specifically, the image data is transmitted to a computer via USB, and the computer then uses an algorithm to analyze the image, calculates the distance from the laser spot to the center of the image sensor 4, and then measures the distance based on the principle of triangulation.

[0067] Furthermore, in this embodiment, the USB conversion chip 6 is disposed on the second side 12 of the circuit board 1. This optimizes the layout of the circuit board 1 and isolates the components, ensuring that the data captured by the image sensor 4 can be smoothly transmitted to external devices (such as computers) via the USB interface.

[0068] This utility model also proposes an electronic device, which includes a 3D printer, a microscope, or a thickness detection device, etc. The electronic device includes a laser displacement sensor 100. The specific structure of the laser displacement sensor 100 is as described in the above embodiments. Since this electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0069] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A laser displacement sensor characterized by, include: A circuit board having a first side and a second side disposed opposite to each other in a first direction; A laser head is mounted on the first side of the circuit board, and the laser head includes a laser diode soldered to the circuit board; A lens is mounted on a first side of the circuit board and spaced apart from the laser head in a second direction; and, An image sensor is located at the end of the lens facing the circuit board and is soldered to the circuit board.

2. The laser displacement sensor of claim 1, wherein, Both the laser head and the lens extend along the first direction.

3. The laser displacement sensor of claim 2, wherein, The laser head has a first axis extending along the first direction, the lens has a second axis extending along the first direction, and the image sensor has a central axis extending along the second direction, which is coplanar or parallel to the first axis and the second axis.

4. The laser displacement sensor of claim 1, wherein, The image sensor includes a CMOS sensor or a CCD sensor; and / or, The wavelength of the laser diode is set to be greater than or equal to 630nm and less than or equal to 670nm.

5. The laser displacement sensor of claim 1, wherein, The laser displacement sensor also includes a mounting base mounted on the circuit board. The mounting base has a through hole along the first direction corresponding to the image sensor. The lens is mounted on the side of the mounting base corresponding to the through hole and away from the circuit board. The mounting base is screwed or snapped onto the circuit board.

6. The laser displacement sensor of claim 5, wherein, The lens is detachably connected to the mounting base.

7. The laser displacement sensor of claim 6, wherein, One of the lens and the mounting base is provided with an internal thread, and the other is provided with an external thread that is screwed into the internal thread.

8. The laser displacement sensor of claim 1, wherein, The laser displacement sensor also includes a USB conversion chip, which is soldered to the circuit board and electrically connected to the image sensor.

9. The laser displacement sensor of claim 8, wherein, The USB conversion chip is located on the second side of the circuit board.

10. An electronic device, comprising: Including the laser displacement sensor as described in any one of claims 1 to 9.

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