Laser displacement sensor shell using diffusion lens and linear polarizer in combined mode

Abstract

The utility model discloses a laser displacement sensor shell using a diffusion lens and a linear polarizer in a combined mode, and particularly relates to the field of photoelectric measurement. Comprising a lower shell, the upper cover of the lower shell is provided with a cover plate, the lower shell comprises a bottom plate, the surface of the bottom plate is vertically connected with a U-shaped first baffle, a second baffle is connected between the opening ends of the first baffle, and a first groove and a second groove are formed in the second baffle at intervals; the first groove is located at the receiving end of the laser displacement sensor. A first connecting plate is connected between the opening ends of the first grooves, and a first through hole matched with the first linear polarizer is formed in the first connecting plate; the second groove is located at the transmitting end of the laser displacement sensor; a second connecting plate is connected between the two inner side walls of the second groove, and two second through holes parallel to each other are formed in the second connecting plate. Through the shell, the laser displacement sensor body and each optical element can be integrally packaged.

Description

Technical Field

[0001] This application relates to the field of photoelectric measurement, and more particularly to a housing for a laser displacement sensor that combines a diffusion lens and a linear polarizer. Background Technology

[0002] Laser displacement sensors improve measurement accuracy and efficiency in industrial settings by enabling non-contact measurement, avoiding damage to the measured object. With measurement accuracy down to the micrometer level, they are suitable for precision parts dimensional inspection and thickness measurement, such as semiconductor wafer surface flatness inspection. They offer high measurement speed, allowing real-time data acquisition to meet the high-speed inspection needs of production lines, such as online dimensional monitoring of automotive parts, thus improving production efficiency. They are adaptable to complex industrial environments with strong anti-interference capabilities, operating stably in harsh environments such as dust, oil, and vibration, for example, in monitoring the diameter of high-temperature rolling mill rolls in steel plants. Unaffected by the color or material of the measured object, they can accurately measure various materials such as metals, plastics, and glass, broadening their application range.

[0003] When existing laser sensors illuminate smooth surfaces such as mirrors, polished metals, glass, glossy paint, and liquids, strong specular reflection occurs. This intense specular reflection can saturate the receiver, preventing the reading of a valid signal and resulting in "missed" measurement points. Therefore, matching optical components are needed to address this issue. However, the laser sensor housing only encapsulates and secures the sensor itself, lacking a positioning structure for the accompanying optical components. Consequently, it's impossible to achieve a unified encapsulation of the optical components and the laser sensor, compromising their stability and leading to inaccurate measurement results. Utility Model Content

[0004] The main objective of this application is to provide a laser displacement sensor housing that combines a diffusion lens and a linear polarizer, aiming to solve the problem that existing housings cannot integrally encapsulate optical components and laser sensors.

[0005] To achieve the above objectives, this application provides a housing for a laser displacement sensor that combines a diffusion lens and a linear polarizer. The housing includes a lower housing with a cover plate on top. The lower housing includes a base plate with a U-shaped first baffle vertically connected to its surface. A second baffle is connected between the open ends of the first baffle, and a first groove and a second groove are spaced apart on the second baffle. The first groove is located at the receiving end of the laser displacement sensor. A first connecting plate is connected between the open ends of the first groove, and a first through hole adapted to the first linear polarizer is formed on the first connecting plate. The second groove is located at the emitting end of the laser displacement sensor. A second connecting plate is connected between the two inner sidewalls of the second groove, and two parallel second through holes are formed on the second connecting plate, each adapted to the diffusion lens and the second linear polarizer, respectively.

[0006] Optionally, a positioning post adapted to the positioning hole of the laser displacement sensor is fixed on the base plate, and the positioning post passes through the positioning hole.

[0007] Optionally, the second connecting plate and the opening end of the second groove form a positioning groove, and a protrusion adapted to the positioning groove is connected to the cover plate, the protrusion being located inside the positioning groove.

[0008] Optionally, a first positioning groove adapted to the first linear polarizer is provided at the bottom of the first groove, and the first linear polarizer is fixed through the first through hole and the first positioning groove.

[0009] Optionally, the bottom of the second groove is provided with a second positioning groove corresponding to the two second through holes, and the diffusion lens and the second linear polarizer are fixed through the corresponding second through holes and second positioning grooves respectively.

[0010] Optionally, a connecting post is fixed on the base plate, the free end of the connecting post has a first opening, and the cover plate has a second opening corresponding to the first opening. The first opening and the second opening are connected by fasteners.

[0011] Optionally, the first baffle has a guide rail groove on the side wall of the opening end, and the second baffle has sliders connected to both ends, with the sliders located in the guide rail groove.

[0012] Optionally, an observation window is provided on one side wall of the first baffle for observing the response status of the laser displacement sensor.

[0013] Optionally, the base plate is provided with heat dissipation holes.

[0014] Optionally, a mortise is attached to the outer side of the first baffle.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] This utility model combines a diffuser lens and a linear polarizer in the housing of a laser displacement sensor. The laser displacement sensor is placed inside the lower housing, and a first connecting plate is provided, forming a positioning frame with a first groove, which can fix the first linear polarizer to the receiving end of the laser displacement sensor. A second connecting plate is provided, forming two positioning frames with the bottom of the second groove, which can encapsulate the emitting end of the laser displacement sensor, including the diffuser lens, the first linear polarizer, and the second linear polarizer, and ensure the stability of the laser displacement sensor and its optical components, thereby improving the accuracy of laser displacement sensor measurements. The diffuser lens can increase the effective illumination area and enhance the intensity of diffuse reflection signals. The combination of the first linear polarizer at the emitting end and the second linear polarizer at the receiving end significantly reduces the interference of specular reflection noise on the measurement and improves the measurement stability, especially when measuring highly reflective surfaces. Attached Figure Description

[0017] Figure 1 An exploded view of the housing of a laser displacement sensor that uses a combination of a diffusion lens and a linear polarizer, according to this application.

[0018] Figure 2 This is a front view of a laser displacement sensor housing that uses a combination of a diffusion lens and a linear polarizer, according to this application.

[0019] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The first embodiment of this utility model provides a housing for a laser displacement sensor that combines a diffusion lens and a linear polarizer, such as... Figure 1 As shown, the device includes a lower housing 1, with a cover plate 2 on top. The lower housing 1 includes a bottom plate 101, with a U-shaped first baffle 102 vertically connected to its surface. A second baffle 103 is connected between the open ends of the first baffle 102, and a first groove 104 and a second groove 105 are spaced apart on the second baffle 103. The first groove 104 is located at the receiving end of the laser displacement sensor 100. A first connecting plate 106 is connected between the open ends of the first groove 104, and a first through hole 107 adapted to the first linear polarizer is formed on the first connecting plate 106. A first positioning groove 108 adapted to the first linear polarizer is formed at the bottom of the first groove 104, and the first linear polarizer 3 is fixed through the first through hole 107 and the first positioning groove 108. The second groove 105 is located at the emitting end of the laser displacement sensor 100. A second connecting plate 109 is connected between the two inner sidewalls of the second groove 105. The second connecting plate 109 has two parallel second through holes 1010, which are respectively adapted to the diffusion lens 4 and the second linear polarizer 5. The bottom of the second groove 105 has second positioning grooves 1011 corresponding to the two second through holes 1010. The diffusion lens 4 and the second linear polarizer 5 are fixed through the corresponding second through holes 1010 and second positioning grooves 1011.

[0022] In this embodiment, the laser displacement sensor 100 is placed inside the lower housing 1. A first connecting plate 106 is provided, forming a positioning frame with the first groove 104, which can fix the first linear polarizer 3 to the receiving end of the laser displacement sensor 100. A second connecting plate 109 is provided, forming two positioning frames with the bottom of the second groove 105, which can fix the diffusion lens 4 and the second linear polarizer 5 to the emitting end of the laser displacement sensor 100. Furthermore, the area between the second connecting plate 109 and the bottom of the second groove 105 is located at the emitting end of the laser displacement sensor 100, which can simultaneously fix the laser displacement sensor 100 and other optical components, and overcome the defects of the laser displacement sensor 100 during measurement. Furthermore, the first linear polarizer 3 is fixed through the first through hole 107 and the first positioning groove 108, and the diffusion lens 4 and the second linear polarizer 5 are fixed through the corresponding second through hole 1010 and the second positioning groove 1011, respectively, ensuring the stability of the diffusion lens 4, the first linear polarizer 3, and the second linear polarizer 5 during use and reducing shaking.

[0023] In this embodiment, the laser displacement sensor 100 body, diffusion lens 4, first linear polarizer 3, and second linear polarizer 5 are installed in the housing. Upon initial use, the laser emitted from the laser displacement sensor 100 passes through the diffusion lens 4 and then the second linear polarizer 5 to illuminate the surface of the object being measured. After reflection from the object's surface, the laser returns to the receiving end of the laser displacement sensor 100 via the first linear polarizer to complete the measurement. This addresses the reliability issues of existing laser displacement sensors 100 when used in combination, under conditions of specular reflection, ambient light interference, or different material reflectivities. Polarization filtering reduces ambient light interference and suppresses specific interference sources (spectral reflection, sensor crosstalk), thereby improving the sensor's stability and reliability in complex optical environments.

[0024] Furthermore, a positioning post 6, which is adapted to the positioning hole 7 of the laser displacement sensor 100, is fixed on the base plate 101, and the positioning post 6 passes through the positioning hole 7. Through the cooperation of the positioning post 6 and the positioning hole 7, the laser displacement sensor 100 is fixed in the lower housing 1 to ensure its stability during the measurement process.

[0025] The second connecting plate 109 and the opening end of the second groove 105 form a positioning groove. A protruding strip 8 adapted to the positioning groove is connected to the cover plate 2, and the protruding strip 8 is located in the positioning groove. A connecting post 9 is fixed on the bottom plate 101. The free end of the connecting post has a first opening. The cover plate 2 has a second opening 10 corresponding to the first opening. The first opening and the second opening 10 are connected by fasteners. The protruding strip 8 cooperates with the positioning groove to connect the lower housing 1 and the cover plate 2, and can ensure the accurate correspondence of the first opening and the second opening 10, further ensuring the firm connection between the lower housing 1 and the cover plate 2.

[0026] The first baffle 102 has a guide rail groove 11 on its open end sidewall, and the second baffle has sliders 12 connected to both ends, with the sliders 12 located inside the guide rail groove 11. In use, after fixing the laser displacement sensor 100 to the base plate 101, the guide rail groove 11 and the sliders 12 are moved up and down in coordination, which facilitates the replacement of the diffusion lens 4, the first linear polarizer 3, and the second linear polarizer 5 with different parameters.

[0027] A viewing window 13 is provided on one side wall of the first baffle 102 for observing the response status of the laser displacement sensor 100. An inclined surface is formed between the other two side walls of the first baffle 102, and a wire hole 16 for power supply is provided on the inclined surface. Heat dissipation holes 14 are provided on the base plate 101 to ensure that the laser displacement sensor 100 operates at a suitable temperature. A mortise 15 is connected to the outer side of the first baffle 102, through which the laser displacement sensor 100 of this embodiment can be fixed as a whole to the platform or base, connected to a power source, and the object to be measured can be placed according to the position of the light spot for detection.

[0028] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A housing for a laser displacement sensor that combines a diffusion lens and a linear polarizer, characterized in that, The lower housing includes a lower housing, and a cover plate is provided on the upper part of the lower housing. The lower housing includes: The base plate has a U-shaped first baffle vertically connected to its surface, and a second baffle is connected between the open ends of the first baffle. The second baffle is provided with a first groove and a second groove spaced apart. The first groove is located at the receiving end of the laser displacement sensor; a first connecting plate is connected between the open ends of the first groove, and a first through hole adapted to the first linear polarizer is provided on the first connecting plate. The second groove is located at the emitting end of the laser displacement sensor; a second connecting plate is connected between the two inner sidewalls of the second groove, and two parallel second through holes are opened on the second connecting plate, which are respectively adapted to the diffusion lens and the second linear polarizer.

2. The laser displacement sensor housing using a combination of a diffusion lens and a linear polarizer according to claim 1, characterized in that, The base plate is fixed with a positioning post that matches the positioning hole of the laser displacement sensor, and the positioning post passes through the positioning hole.

3. The laser displacement sensor housing using a combination of a diffusion lens and a linear polarizer according to claim 1, characterized in that, The second connecting plate and the opening end of the second groove form a positioning groove, and the cover plate is connected with a protrusion that matches the positioning groove, the protrusion being located inside the positioning groove.

4. The laser displacement sensor housing using a combination of a diffusion lens and a linear polarizer according to claim 1, characterized in that, The bottom of the first groove is provided with a first positioning groove that is adapted to the first linear polarizer, and the first linear polarizer is fixed through the first through hole and the first positioning groove.

5. The laser displacement sensor housing using a combination of a diffusion lens and a linear polarizer according to claim 1, characterized in that, The bottom of the second groove is provided with a second positioning groove corresponding to the two second through holes. The diffusion lens and the second linear polarizer are fixed through the corresponding second through holes and second positioning grooves, respectively.

6. The laser displacement sensor housing using a combination of a diffusion lens and a linear polarizer according to claim 1, characterized in that, A connecting post is fixed on the base plate. A first opening is provided at the free end of the connecting post. A second opening corresponding to the first opening is provided on the cover plate. The first opening and the second opening are connected by fasteners.

7. The laser displacement sensor housing using a combination of a diffusion lens and a linear polarizer according to claim 1, characterized in that, The first baffle has a guide rail groove on the side wall of its open end, and the second baffle has sliders connected to both ends, with the sliders located in the guide rail groove.

8. The laser displacement sensor housing using a combination of a diffusion lens and a linear polarizer according to claim 1, characterized in that, The first baffle has an observation window on one side wall for observing the response status of the laser displacement sensor.

9. The laser displacement sensor housing using a combination of a diffusion lens and a linear polarizer according to claim 1, characterized in that, The base plate has heat dissipation holes.

10. The laser displacement sensor housing using a combination of a diffusion lens and a linear polarizer according to claim 1, characterized in that, The outer side of the first baffle is connected with a mortise.

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