Optical module and laser displacement sensor

Abstract

The utility model belongs to the technical field of sensors, and particularly relates to an optical module and a laser displacement sensor. The optical module comprises a module support, an emission light source assembly used for emitting light to a to-be-detected object, an optical detector arranged on the same side with the emission light source assembly relative to the to-be-detected object, and a reflection structure used for reflecting the light. The emission light source assembly, the optical detector and the reflection structure are all arranged on the module support, and the reflection structure is used for reflecting the light reflected by the to-be-detected object to the optical detector so as to reduce the distance between the optical detector and the to-be-detected object. The laser displacement sensor can solve the problem of how to reduce the size of the laser displacement sensor.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and particularly relates to an optical module and a laser displacement sensor. Background Art

[0002] A laser displacement sensor is a sensor that realizes the measurement of the target distance based on the principle of laser triangulation ranging. It has the remarkable advantages of non-contact, high precision, high speed, and wide applicability, and has a wide range of applications in the field of industrial automation. The laser displacement sensor can accurately measure the position, displacement and other changes of the measured object non-contact, and is mainly used for the measurement of geometric quantities such as the displacement, thickness, vibration, distance, diameter of the object. In recent years, especially with the development of artificial intelligence, the performance requirements for laser displacement sensors are getting higher and higher.

[0003] However, the existing laser displacement sensors are large in size, not easy to carry, and inconvenient to use in a narrow space. Summary of the Utility Model

[0004] The purpose of the embodiments of the present application is to provide an optical module and a laser displacement sensor, aiming to solve the problem of how to reduce the volume of the laser displacement sensor.

[0005] To achieve the above purpose, the technical solution adopted in the present application is:

[0006] In the first aspect, an optical module is provided, including a module bracket, a transmitting light source component for emitting light to a to-be-measured object, an optical detector disposed on the same side of the transmitting light source component relative to the to-be-measured object, and a reflection structure for reflecting light. The transmitting light source component, the optical detector, and the reflection structure are all disposed on the module bracket. The reflection structure is used to reflect the light reflected by the to-be-measured object to the optical detector, so as to reduce the distance between the optical detector and the to-be-measured object.

[0007] In some embodiments, the reflection structure includes a reflector, and the optical detector is located between the reflector and the transmitting light source component.

[0008] In some embodiments, the reflection structure includes a first reflector and a second reflector. The reflection surfaces of the first reflector and the second reflector are arranged at an angle. The first reflector is used to reflect the light reflected by the to-be-measured object to the second reflector, and the second reflector is used to reflect the light reflected by the first reflector to the optical detector. The receiving surface of the optical detector faces away from the to-be-measured object.

[0009] In some embodiments, the module bracket is provided with a light outlet and a light inlet which are spaced apart from each other, the light outlet and the light inlet are arranged on the same side, and the emission light source assembly emits the light to the object to be measured through the light outlet, and the light reflected by the object to be measured irradiates the reflection structure through the light inlet.

[0010] In some embodiments, the light outlet is provided with a first window mirror, the light inlet is provided with a second window mirror, the light emitted by the emission light source assembly passes through the first window mirror and irradiates the object to be measured, and the light reflected by the object to be measured passes through the second window mirror and irradiates the reflection structure.

[0011] In some embodiments, the optical module further includes a receiving lens, the receiving lens is arranged on the module bracket, and the light reflected by the object to be measured is focused on the optical detector after passing through the receiving lens.

[0012] In some embodiments, the emission light source assembly includes a laser and an emission lens, the light emitted by the laser is emitted through the emission lens, and the emission lens is used to converge the divergent light beam emitted by the laser into a collimated light beam.

[0013] In some embodiments, the emission light source assembly further includes an emission aperture, the light passing through the emission lens irradiates the object to be measured through the emission aperture, and the emission aperture is used to limit the beam width of the light.

[0014] In some embodiments, the optical module further includes a controller, the controller is respectively communicatively connected to the emission light source assembly and the optical detector, the controller is used to control the working state of the emission light source assembly, and is used to receive the signal sent by the optical detector.

[0015] In a second aspect, a laser displacement sensor is provided, and the laser displacement sensor includes the above-mentioned optical module.

[0016] The optical module provided by the present application, by arranging a reflection structure on the optical path between the optical detector and the object to be measured, the reflection structure can turn the light between the optical detector and the object to be measured, thereby folding the optical path between the optical detector and the object to be measured, thereby reducing the distance between the optical detector and the object to be measured, and the optical detector can be arranged closer to the object to be measured, so that the size of the module bracket can be reduced, and further the volume of the laser displacement sensor can be reduced. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic diagram of the principle of the laser displacement sensor provided by the embodiment of the present application;

[0019] Figure 2 is a schematic diagram of the overall structure of the optical module provided by one embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a partial structure of the optical module provided by one embodiment of the present application;

[0021] Figure 4 is an optical path diagram of the optical module provided by one embodiment of the present application;

[0022] Figure 5 is a schematic diagram of the overall structure of the optical module provided by another embodiment of the present application;

[0023] Figure 6 is an optical path diagram of the optical module provided by another embodiment of the present application.

[0024] Among them, the reference numerals in the figure:

[0025] 10, module bracket; 11, light outlet; 12, light inlet; 20, emission light source assembly; 21, laser; 22, emission lens; 30, optical detector; 40, reflection structure; 41, first reflector; 42, second reflector; 43, third reflector; 51, first window mirror; 52, second window mirror; 60, receiving lens; 70, emission diaphragm; 200, object to be measured; 300, light ray. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present utility model.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0029] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0030] Please refer to Figures 1 to 6, an embodiment of the present application provides an optical module, which includes a module bracket 10, a transmitting light source component 20 for emitting light 300 to an object to be measured 200, an optical detector 30 disposed on the same side of the object to be measured 200 as the transmitting light source component 20, and a reflection structure 40 for reflecting the light 300. The transmitting light source component 20, the optical detector 30, and the reflection structure 40 are all disposed on the module bracket 10. The reflection structure 40 is configured to reflect the light 300 reflected by the object to be measured 200 to the optical detector 30, so as to reduce the distance between the optical detector 30 and the object to be measured 200.

[0031] Specifically, the optical detector 30 can receive the illumination of the light 300 from the reflection structure 40, convert the optical signal into an electrical signal related to the illumination position of the light 300, and output the electrical signal.

[0032] The optical module of the embodiment of the present application can be applied to a laser displacement sensor to measure changes in the position, displacement, etc. of the object to be measured 200. For example Figure 1 As shown, the specific measurement principle is as follows: The light 300 emitted by the transmitting light source component 20 irradiates the surface of the object to be measured 200 at a certain angle. The light 300 is reflected by the object to be measured 200 and focused on the optical detector 30. When the position of the object to be measured 200 changes along the illumination direction of the light 300, the angle of the light 300 received by the optical detector 30 will also change accordingly, and the position of the light spot of the light 300 on the optical detector 30 will also move accordingly. The displacement magnitude corresponds to the moving distance of the object to be measured 200. In this way, by calculating the moving amount of the light spot position focused on the optical detector 30, the displacement amount of the object to be measured 200 can be obtained.

[0033] It can be understood that the optical module further includes a controller, which is respectively communicatively connected to the transmitting light source component 20 and the optical detector 30. The controller is configured to control the working state of the transmitting light source component 20 and to receive the signal sent by the optical detector 30.

[0034] The controller can be a measurement and control circuit with a microprocessor as the core. The controller can control the time of emitting the light 300 by the transmitting light source component 20, the intensity of emitting the light 300, the duration of emitting the light 300, etc. After the light 300 reflected by the object to be measured 200 is collected by the optical detector 30, the optical detector 30 can send an electrical signal to the controller, and the controller can calculate the moving distance of the object to be measured 200 according to the electrical signal.

[0035] A fixing structure can be provided on the module bracket 10 to fix the emission light source assembly 20, the optical detector 30, and the reflection structure 40. The emission light source assembly 20, the optical detector 30, and the reflection structure 40 can be fixed to the module bracket 10 by connection methods such as snap connection or bonding. The module bracket 10 can also be provided with an opening for passing a cable to connect internal optical or electrical devices.

[0036] In the embodiment of the present application, the emission light source assembly 20, the optical detector 30, and the reflection structure 40 are installed together, which can overcome the problem that it is not easy to ensure the accuracy and stability of the positions between multiple optical elements, thereby improving the stability of the laser displacement sensor.

[0037] The shape of the module bracket 10 can be flexibly set according to the actual situation. In addition, the material of the module bracket 10 can be polyester or metal material, etc.

[0038] It can be understood that when the reflection structure 40 is not provided, the transmission path of the light 300 reflected from the object to be measured 200 is a straight line. At this time, the optical detector 30 can only be set on the straight path of the light 300 transmission. By providing the reflection structure 40, the position of the optical detector 30 in the module bracket 10 can be flexibly adjusted, and the light 300 between the optical detector 30 and the object to be measured 200 can be turned, which can reduce the extension length of the optical path on the module bracket 10, that is, the size of the module bracket 10 can be reduced.

[0039] In the optical module provided by the present application, by providing the reflection structure 40 on the light 300 path between the optical detector 30 and the object to be measured 200, the reflection structure 40 can turn the light 300 between the optical detector 30 and the object to be measured 200, thereby folding the optical path between the optical detector 30 and the object to be measured 200, so as to reduce the distance between the optical detector 30 and the object to be measured 200. The optical detector 30 can be set closer to the object to be measured 200, so that the size of the module bracket 10 can be reduced, and further the volume of the laser displacement sensor can be reduced.

[0040] In a possible embodiment, as Figure 4 shown, the reflection structure 40 includes a first reflecting mirror 41. The optical detector 30 is located between the first reflecting mirror 41 and the emission light source assembly 20. The first reflecting mirror 41 can reflect the light 300 reflected by the object to be measured 200 once, that is, the optical path between the object to be measured 200 and the optical detector 30 becomes a broken line structure, and the optical path between the object to be measured 200 and the optical detector 30 bends toward the object to be measured 200. Therefore, the optical detector 30 can be closer to the object to be measured 200, so that the size of the module bracket 10 can be reduced.

[0041] In another possible embodiment, asFigure 6 As shown, the reflection structure 40 includes a second reflector 42 and a third reflector 43. The reflecting surfaces of the second reflector 42 and the third reflector 43 are arranged at an angle. The second reflector 42 is configured to reflect the light 300 reflected by the object 200 to be measured to the third reflector 43, and the third reflector 43 is configured to reflect the light 300 reflected by the second reflector 42 to the optical detector 30. The receiving surface of the optical detector 30 faces away from the object 200 to be measured.

[0042] By arranging the second reflector 42 and the third reflector 43, the second reflector 42 and the third reflector 43 can perform double reflection on the light 300 reflected by the object 200 to be measured, which is equivalent to folding the optical path between the object 200 to be measured and the optical detector 30 twice, making the optical path between the object 200 to be measured and the optical detector 30 bend more towards the object 200 to be measured. Compared with the case of arranging a set of reflectors, the optical detector 30 can be closer to the object 200 to be measured.

[0043] It should be noted that the optical detector 30 can be a CMOS (Complementary Metal - Oxide - Semiconductor) sensor. The CMOS sensor can be composed of several parts such as an image - sensitive unit array, a row driver, a column driver, a timing control logic, an AD converter, a data bus output interface, and a control interface. These parts can be integrated on the same silicon chip. The CMOS sensor has the advantage of high pixel density, can capture image details more precisely, and provide clearer and more realistic image effects; and has lower power consumption, can provide longer usage time; the CMOS sensor integrates functions such as image capture, image processing, and image transmission, has a smaller volume and higher reliability, and is convenient for product design and manufacturing.

[0044] In some embodiments, the module bracket 10 is provided with a light - emitting port 11 and a light - receiving port 12 that are spaced apart from each other. The light - emitting port 11 and the light - receiving port 12 are arranged on the same side. The emission light source assembly 20 emits light 300 to the object 200 to be measured through the light - emitting port 11, and the light 300 reflected by the object 200 to be measured irradiates the reflection structure 40 through the light - receiving port 12.

[0045] It should be noted that the distance between the light - emitting port 11 and the light - receiving port 12 is not limited and can be adjusted according to actual needs. The light - emitting port 11 and the light - receiving port 12 can be parallel to one side of the module bracket 10. It can be understood that the positional relationship between the light - emitting port 11 and the light - receiving port 12 can also adopt other forms, rather than being limited to the forms mentioned in the above embodiments, as long as it can achieve the function of emitting and receiving light 300.

[0046] The light ray 300 can be emitted towards the object to be measured 200 through the light exit 11, and the light ray 300 reflected by the object to be measured 200 can reach the reflection structure 40 through the light entrance 12. It can be understood that the area of the light exit 11 can be smaller than the area of the light entrance 12, that is, the area of the light entrance 12 can be larger. Therefore, when the incident angle of the light ray 300 changes greatly, the light ray 300 can also irradiate the reflection structure 40 through the light entrance 12.

[0047] In some embodiments, a first window mirror 51 is provided at the light exit 11, and a second window mirror 52 is provided at the light entrance 12. The light ray 300 emitted by the emission light source assembly 20 passes through the first window mirror 51 and irradiates the object to be measured 200, and the light ray 300 reflected by the object to be measured 200 passes through the second window mirror 52 and irradiates the reflection structure 40.

[0048] The first window mirror 51 and the second window mirror 52 can allow the light ray 300 to pass through better. At the same time, the first window mirror 51 and the second window mirror 52 are provided on the outer shell surface of the module bracket 10, which can play a role in dust prevention and protection.

[0049] In addition, the first window mirror 51 is placed at an angle relative to the outer shell surface of the module bracket 10. Such a setting is to prevent the first window mirror 51 from generating stray light with the emission light source assembly 20.

[0050] In some embodiments, the optical module further includes a receiving lens 60. The receiving lens 60 is disposed on the module bracket 10. The light ray 300 reflected by the object to be measured 200 is focused on the optical detector 30 after passing through the receiving lens 60. The receiving lens 60 can make the light spots reflected from different positions of the object to be measured 200 within the measurement range be focused on the optical detector 30.

[0051] In some embodiments, the emission light source assembly 20 includes a laser 21 and an emission lens 22. The light ray 300 emitted by the laser 21 is emitted through the emission lens 22. The emission lens 22 is used to converge the divergent light beam emitted by the laser 21 into a collimated light beam, so the measurement accuracy can be improved.

[0052] Specifically, the laser 21 is a semiconductor laser 21. The semiconductor laser 21 is smaller, lighter and more portable than other types of lasers 21, with a smaller volume and lighter weight. This makes them suitable for integration into various devices and systems. And the semiconductor laser 21 has high stability, relatively stable output laser frequency and power, and a long service life, and can work continuously for thousands of hours or even longer, which can reduce the maintenance and replacement costs of the device. It can be understood that the above emission light source assembly 20 can also adopt other forms, not limited to the forms already mentioned in the above embodiments, as long as it can achieve the function of emitting laser light.

[0053] In some embodiments, the emission light source assembly 20 further includes an emission aperture 70. The light ray 300 passing through the emission lens 22 irradiates the object to be measured 200 after passing through the emission aperture 70. The emission aperture 70 is used to limit the beam width of the light ray 300, which can reduce unnecessary light rays 300 and better control the quality, size, and shape of the light ray 300 shaped by the emission lens 22.

[0054] This application also proposes a laser displacement sensor, which includes an optical module. The specific structure of the optical module refers to the above embodiments. Since this laser displacement sensor adopts all the technical solutions of the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0055] In summary, for the optical module provided in this application, by setting a reflection structure 40 on the light ray 300 path between the optical detector 30 and the object to be measured 200, the reflection structure 40 can turn the light ray 300 between the optical detector 30 and the object to be measured 200, thereby folding the optical path between the optical detector 30 and the object to be measured 200, reducing the distance between the optical detector 30 and the object to be measured 200. The optical detector 30 can be set closer to the object to be measured 200, which can reduce the size of the module bracket 10, and further reduce the volume of the laser displacement sensor.

[0056] The above are only optional embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. An optical module, characterized in that: It includes a module bracket (10), a transmitting light source assembly (20) for emitting light (300) to a to-be-tested object (200), an optical detector (30) disposed on the same side of the to-be-tested object (200) as the transmitting light source assembly (20), and a reflection structure (40) for reflecting the light (300). The transmitting light source assembly (20), the optical detector (30), and the reflection structure (40) are all disposed on the module bracket (10). The reflection structure (40) is configured to reflect the light (300) reflected by the to-be-tested object (200) to the optical detector (30), so as to reduce the distance between the optical detector (30) and the to-be-tested object (200).

2. The optical module according to claim 1, wherein: The reflection structure (40) includes a first mirror (41). The optical detector (30) is located between the first mirror (41) and the transmitting light source assembly (20), and the receiving surface of the optical detector (30) faces away from the transmitting light source assembly (20).

3. The optical module according to claim 2, wherein: The reflection structure (40) includes a second mirror (42) and a third mirror (43). The reflecting surfaces of the second mirror (42) and the third mirror (43) are arranged at an angle. The second mirror (42) is configured to reflect the light (300) reflected by the to-be-tested object (200) to the third mirror (43), and the third mirror (43) is configured to reflect the light (300) reflected by the second mirror (42) to the optical detector (30). The receiving surface of the optical detector (30) faces away from the to-be-tested object (200).

4. The optical module according to claim 1, wherein: The module bracket (10) is provided with a light outlet (11) and a light inlet (12) which are spaced apart from each other. The light outlet (11) and the light inlet (12) are disposed on the same side. The transmitting light source assembly (20) emits the light (300) to the to-be-tested object (200) through the light outlet (11), and the light (300) reflected by the to-be-tested object (200) irradiates the reflection structure (40) through the light inlet (12).

5. The optical module according to claim 4, wherein: The light outlet (11) is provided with a first window mirror (51), and the light inlet (12) is provided with a second window mirror (52). The light (300) emitted by the transmitting light source assembly (20) passes through the first window mirror (51) and irradiates the to-be-tested object (200), and the light (300) reflected by the to-be-tested object (200) passes through the second window mirror (52) and irradiates the reflection structure (40).

6. The optical module according to any one of claims 1 to 5, characterized in that: The optical module further includes a receiving lens (60). The receiving lens (60) is disposed on the module bracket (10). The light (300) reflected by the to-be-tested object (200) is focused on the optical detector (30) after passing through the receiving lens (60).

7. The optical module according to any one of claims 1 to 5, characterized in that: The emission light source assembly (20) includes a laser (21) and an emission lens (22). The light beam (300) emitted by the laser (21) is emitted through the emission lens (22), and the emission lens (22) is configured to converge the divergent light beam emitted by the laser (21) into a collimated light beam.

8. The optical module according to claim 7, wherein: The emission light source assembly (20) further includes an emission aperture (70). The light beam (300) passing through the emission lens (22) irradiates the object to be measured (200) through the emission aperture (70), and the emission aperture (70) is configured to limit the beam width of the light beam (300).

9. The optical module according to claim 1, wherein: The optical module further includes a controller. The controller is communicatively connected to the emission light source assembly (20) and the optical detector (30) respectively. The controller is configured to control the working state of the emission light source assembly (20) and to receive the signal sent by the optical detector (30).

10. A laser displacement sensor, characterized in that: The laser displacement sensor includes the optical module according to any one of claims 1 to 9.

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