Laser focus recognition device, tracking system, recognition method and laser engraving machine

Abstract

The invention relates to a laser focus recognition device, a laser receiving unit comprises a laser receiving element, the laser receiving element is provided with a laser receiving area, the laser receiving area is used for receiving laser rays, and different electric energy information is generated according to different ray positions of the received laser rays. The information processing unit is in data connection with the laser receiving unit, and the electric energy information is used for determining the ray focus position of the laser rays. The laser focus recognition device can establish corresponding association between different ray positions of the laser rays and the electric energy information, and when the different ray positions of the laser rays are projected to the laser receiving area, the laser receiving area can correspondingly generate different electric energy information. The electric energy information corresponding to the ray focus position of the laser ray is also different from the electric energy information corresponding to other ray positions of the laser ray, and the information processing unit can determine the ray focus position of the laser ray according to the different electric energy information.

Description

Technical Field

[0001] The present application relates to the field of laser engraving technology, and in particular to a laser focus recognition device, a tracking system, a recognition method and a laser engraving machine. Background Art

[0002] Laser surface treatment technology generally refers to irradiating the surface of metal or polymer materials with a laser beam, and evaporating the material on the surface of the receptor to form a microstructure or engraving, so that the surface of the receptor has color or engraved patterns and text. Laser surface treatment technology has become an important part of modern processing and production. At present, laser processing equipment is mainly focused on plane surface treatment, which is limited by the flatness of the receptor surface. In the process of surface treatment, it is necessary to focus the laser first. The existing laser focusing method generally uses the naked eye to judge whether the laser output optical cable is vertical, and then briefly emits light and hits points multiple times. The images taken by the naked eye or the camera device are compared with the points (or images) hit at different ray positions, and are adjusted accordingly to gradually approach the most appropriate focus.

[0003] In actual operation, due to different laser types, different wavelengths, and different objects for surface treatment, receptor shapes, sizes, and material hardness are also different. Therefore, it is necessary to make suitable tooling according to the laser wavelength range and the shape, size, and position of the receptor to reach the focal position of the equipment. However, usually a set of tooling can only be used for its specific receptor, resulting in a narrow scope of application, which hinders the development of laser surface treatment technology. Due to equipment limitations, if there is an over-sized receptor, the corresponding surface treatment may not be completed. Summary of the invention

[0004] Based on this, it is necessary to provide a laser focus recognition device, a tracking system, a recognition method and a laser engraving machine to address at least one of the technical problems mentioned above.

[0005] The present application provides a laser focus recognition device, the laser focus recognition device comprising:

[0006] A laser receiving unit, the laser receiving unit comprising a laser receiving element, the laser receiving element having a laser receiving area, the laser receiving area being used to receive laser rays and generate different electrical energy information according to different ray positions of the received laser rays;

[0007] An information processing unit, the information processing unit is data-connected with the laser receiving unit and is used to obtain the electrical energy information, and the electrical energy information is used to determine the focus position of the laser beam.

[0008] In one embodiment, the laser receiving element includes a zinc oxide nanowire array, and the array surface of the zinc oxide nanowire array is used to constitute the laser receiving area. When the array surface receives different ray positions of the laser beam, the electrical energy information generates different values, wherein the value of the electrical energy information is the largest when the array surface receives the ray focus position of the laser beam.

[0009] In one embodiment, the laser receiving unit further includes:

[0010] An electronic conversion element, which is data-connected with the laser receiving element and is used to obtain the electric energy information and generate current numerical information based on the electric energy information; the information processing unit is data-connected with the electronic conversion element and is used to obtain the current numerical information and determine the beam focus position of the laser beam based on the current numerical information.

[0011] In one of the embodiments, the information processing unit is further used to generate displacement control information according to the electric energy information or the current value information.

[0012] The present application provides a laser focus tracking system, the laser focus tracking system comprising:

[0013] The laser focus identification device;

[0014] A displacement control device is data-connected to the laser focus identification device, and is used to obtain the displacement control information and control the target receptor to move to the beam focus position of the laser beam according to the displacement control information.

[0015] In one embodiment, the displacement control device comprises:

[0016] a first control mechanism, the first control mechanism being control-connected to the laser focus identification device and used for controlling the movement of the laser receiving element relative to the laser beam, and assisting the laser receiving element in determining the beam focus position of the laser beam;

[0017] The second control mechanism is data-connected with the laser focus recognition device, and is used to obtain the displacement control information and control the target receptor to move to the beam focus position of the laser beam according to the displacement control information.

[0018] The present application provides a laser engraving machine, which includes a laser emitting unit and a laser focus tracking system, wherein the laser emitting unit is used to project laser rays.

[0019] The present application provides a laser focus recognition method based on the laser focus recognition device, and the laser focus recognition method comprises the following steps:

[0020] A laser beam is projected onto a laser receiving area of ​​the laser receiving element, and the beam position where the laser beam intersects with the laser receiving area is adjusted. The beam focus position of the laser beam is determined according to different electrical energy information generated by the laser receiving element when different beam positions intersect with the laser receiving area.

[0021] In one embodiment, the laser focus identification method comprises the following steps:

[0022] Selecting a zinc oxide nanowire array as the laser receiving element, and using the array surface of the zinc oxide nanowire array as the laser receiving area;

[0023] Projecting a laser beam onto the array surface of the zinc oxide nanowire array, adjusting the beam position where the laser beam intersects with the array surface, and obtaining different electrical energy information generated by the zinc oxide nanowire array when different beam positions are projected and intersect with the array surface;

[0024] When the value of the electric energy information is the largest, the ray position where the laser ray intersects with the array surface at this time is determined as the ray focus position of the laser ray.

[0025] In one embodiment, the laser focus identification method comprises the following steps:

[0026] The electric energy information is converted into current value information. When the current value of the current value information is the largest, the ray position where the laser ray intersects with the array surface is determined as the ray focus position of the laser ray.

[0027] In the above-mentioned laser focus recognition device, tracking system, recognition method and laser engraving machine, the laser focus recognition device can establish corresponding associations between different ray positions of the laser beam and electrical energy information. When different ray positions of the laser beam are projected onto the laser receiving area, the laser receiving area can correspondingly generate different electrical energy information. Therefore, the electrical energy information corresponding to the ray focus position of the laser beam is also different from the electrical energy information corresponding to other ray positions of the laser beam. This enables the information processing unit to reversely determine the different laser positions of the laser beam based on the different electrical energy information, and then determine the ray focus position of the laser beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A three-dimensional schematic diagram of a second control mechanism provided in one embodiment of the present application.

[0029] Figure 2A schematic plan view of a second control mechanism provided in accordance with an embodiment of the present application.

[0030] Figure Number:

[0031] 1000, base; 2000, host; 2000a, control button; 2000b, storage table. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0038] An embodiment of the present application provides a laser focus recognition device, which includes a laser receiving unit and an information processing unit. The laser focus recognition device can be adapted for use with a laser emitting unit capable of projecting laser beams. When the laser focus recognition device is used to identify the beam focus position of a laser beam, the laser emitting unit can be used as a laser source to project the laser beam to be identified. The laser receiving unit includes a laser receiving element, which has a laser receiving area, and the laser receiving area is used to receive the laser beam projected by the laser emitting unit. When the laser receiving area receives different beam positions of the laser beam, the laser receiving area will generate different electrical energy information accordingly. Therefore, the information processing unit is data-connected to the laser receiving unit and can be used to obtain electrical energy information, which is used to determine the beam focus position of the laser beam.

[0039] It can be seen that the laser focus identification device can establish corresponding associations between different ray positions of the laser ray and electrical energy information. Among them, the different ray positions of the laser ray indicate that, assuming that the laser ray contains countless laser points on the ray projection trajectory, countless laser points construct a complete laser ray, wherein each laser point represents a ray position, and the positions of different laser points on the ray projection trajectory are different ray positions of the laser ray. According to this definition, when different ray positions of the laser ray are projected onto the laser receiving area, it is equivalent to a certain laser point falling on the laser receiving area, and at this time the laser receiving area can generate different electrical energy information correspondingly. Among them, the process of projecting the laser ray onto the laser receiving area can fix the laser emitting unit (laser source) and adjust the laser receiving area relative to the laser emitting unit.

[0040] Therefore, the electrical energy information corresponding to the beam focus position of the laser beam is also different from the electrical energy information corresponding to other beam positions of the laser beam, which enables the information processing unit to reversely determine the different beam positions of the laser beam based on different electrical energy information, and then determine the beam focus position of the laser beam.

[0041] The laser receiving element can be used in various forms to receive laser rays, so that the laser focus identification device can establish a corresponding association between different ray positions of the laser rays and electrical energy information. For example, in one embodiment, the laser receiving element uses a zinc oxide nanowire array, and the zinc oxide nanowire array is prepared by embedding zinc oxide nanowires with epoxy resin and then using nano-cutting and other methods. The preparation process is, for example, to prepare zinc oxide nanowires from a substrate with zinc oxide seeds by a hydrothermal method, and then embed the zinc oxide nanowires with epoxy resin, and then cut them by a nano-cutting machine to cut them into nanowire array epoxy resin sheets with a certain thickness. In this process, the corresponding parameters can be adjusted by the nano-cutting machine, and zinc oxide nanowires of different lengths have different conversion rates to photoelectric signals. Finally, the epoxy resin is removed to obtain the zinc oxide nanowire array.

[0042] The zinc oxide nanowire array has a corresponding feedback effect on the laser beam. When the laser beam is irradiated on the zinc oxide nanowire array (the laser energy is greater than or equal to the band gap), the electrons in the valence band (filled with electrons) will be excited to the conduction band (without electrons), thereby generating corresponding electrical energy information. The information content contained in the electrical energy information can be mainly reflected by the specific numerical value generated by the zinc oxide nanowire array at this time. Because the value of the electrical energy information fed back by the focal position of the laser beam is the highest, the focal position of the beam can be judged by judging the value of the electrical energy information.

[0043] Therefore, the array surface of the zinc oxide nanowire array can be used to form a laser receiving area. When the array surface receives laser beams at different beam positions, the electric energy information will generate different values. Among them, the electric energy information generated by the array surface when receiving the laser beam at the beam focus position has the largest value. When the largest value is selected from the acquired electric energy information, the beam position of the corresponding laser beam can be determined as the beam focus position. Among them, the operator can keep the laser emitting unit (laser source) that projects the laser beam fixed, and then adjust the array surface relative to the laser emitting unit (laser source).

[0044] The wavelength distribution of commonly used laser beams is relatively wide, for example, the wavelength of red laser is between 630 nanometers and 750 nanometers, the wavelength of green laser is between 495 nanometers and 570 nanometers, and the wavelength of ultraviolet laser is between 200 nanometers and 400 nanometers. Therefore, those skilled in the art can select zinc oxide nanowire arrays of different specifications according to different types of laser beams. The order of magnitude of zinc oxide nanowire arrays of different specifications is different, for example, 1mm 2 The number of inner nanowires is between one hundred thousand and one million, which can be selected by technicians in this field and is not limited here.

[0045] Therefore, under the premise of ensuring the qualified rate of laser surface treatment, the operator can keep the laser emitting unit (laser source) that projects the laser beam fixed, and then adjust the laser receiving area relative to the laser emitting unit (laser source). After determining the beam position of the laser beam through the acquired electrical energy information, the current laser beam can be automatically focused without the need to frequently change the tooling. In addition, the multi-specification zinc oxide nanowire array can adapt to laser beams of different wavelengths, covering most of the commonly used laser wavelengths, so that the laser focus recognition device can be applied to the automatic focusing of a variety of laser beams, and can perform rapid focus positioning to complete the laser surface (special-shaped surface) processing of target receptors of multiple sizes / specifications.

[0046] The ray focus position of the laser beam can be directly judged by the numerical value represented by the electric energy information. In addition, when judging the ray focus position of the laser beam, it can also be indirectly judged by relying on the electric energy information. For example, in one embodiment, the laser receiving unit also includes an electronic conversion element, which is connected to the laser receiving element data for obtaining the electric energy information and generating current numerical information according to the electric energy information, wherein the electric energy information is converted into current numerical information as an intermediate information. The information processing unit is connected to the electronic conversion element data for obtaining the current numerical information and determining the ray focus position of the laser beam according to the current numerical information. The electronic conversion element can be combined with the zinc oxide nanoarray to form a composite optical identification element, which is used to judge the ray focus position of the laser beam according to the current numerical information. In addition, those skilled in the art can also choose to convert the electric energy information into other information types that are suitable or convenient for identification according to needs, which is not limited here.

[0047] In one of the embodiments, the information processing unit is also used to generate displacement control information based on electrical energy information or current numerical information. The displacement control information includes control logic that can move the target receptor to be laser processed to the beam focus position of the laser beam after the beam focus position of the laser beam is determined, so that after the beam focus position of the laser beam is determined, the control logic can be used to automatically move the target receptor to the beam focus position of the laser beam, and then directly perform laser processing operations, thereby improving the degree of automation.

[0048] The present application provides a laser focus tracking system, which includes a laser focus identification device and a displacement control device. The displacement control device is data-connected to the laser focus identification device for obtaining displacement control information and controlling a target receptor to move to a beam focus position of a laser beam according to the displacement control information, so that after the beam focus position of the laser beam is determined, the displacement control device is used to automatically move the target receptor to the beam focus position of the laser beam, and then directly perform laser processing operations, thereby improving the degree of automation.

[0049] In one embodiment, the displacement control device includes a first control mechanism and a second control mechanism. The first control mechanism is connected to the laser focus recognition device. The first control mechanism can be used to control the movement of the laser receiving element relative to the laser beam, and assist the laser receiving element in determining the beam focus position of the laser beam. The second control mechanism is connected to the laser focus recognition device in data. The second control mechanism can be used only to obtain displacement control information, and control the target receptor to move to the beam focus position of the laser beam according to the displacement control information. Alternatively, the second control mechanism can also simultaneously control the movement of the laser receiving element relative to the laser beam, and assist the laser receiving element in determining the beam focus position of the laser beam. After the position is fixed, the target receptor is directly moved to the beam focus position of the laser beam. Therefore, the first control mechanism and the second control mechanism can be used in combination, or the second control mechanism can complete the work only by the second control mechanism because it also has the functions of the first control mechanism.

[0050] The first control mechanism and the second control mechanism may adopt a mechanism such as a manipulator that can clamp and displace the laser receiving element and the target receptor, and the second control mechanism may select different connection structures according to different target receptors, such as providing a variety of placement tables for target receptors of different shapes and structures, so as to meet the connection requirements of any target receptor, so that the surface to be processed of the target receptor faces the laser beam, for example, to ensure that the target receptor is stable and in a horizontal state, which is not limited here.

[0051] See also Figure 1 and Figure 2 As shown, the second control mechanism may include a base 1000 and a host 2000, the host 2000 has various control buttons 2000a for controlling start, stop, up, down, left, and right movement, and the host 2000 has a storage platform 2000b, the storage platform is selected according to the actual shape and material of the receptor, and is clamped and fixed by a manipulator after selection, so that the surface to be processed of the target receptor faces the laser beam. The storage platform is used to place the target receptor, and can be used to move the laser receiving element or the target receptor. Therefore, when the first control mechanism and the second control mechanism are used in combination, the two storage platforms can be used as the first control mechanism and the second control mechanism respectively, and when the second control mechanism works alone, the two storage platforms can be used as the second control mechanism.

[0052] The laser focus recognition device and the displacement control device form a cooperation. In one embodiment, the first control mechanism can control the movement of the laser receiving element relative to the laser beam, and the beam focus position of the laser beam is determined by the above method, which is not limited here. By feeding back the electric energy information or the current value information to the second control mechanism, the target receptor is transferred to the beam focus position of the laser beam by the second control mechanism, and the target receptors of different shapes and materials are surface treated to reduce the cost of laser surface treatment, improve production efficiency, increase focus stability, and improve the comprehensive pass rate of laser surface treatment. The whole process is an automated implementation to determine the laser focus position, and does not require manual or visual processing system judgment, no judgment error, and no need for multiple dot comparisons, saving time, materials and electricity.

[0053] For example, the first control mechanism first moves on the X or Y axis so that the laser beam is projected on the surface of the laser receiving element, and then controls the laser receiving element to move relative to the laser beam on the Z axis. During the movement, the laser receiving element receives different beam positions of the laser beam and feeds back the electrical energy information in real time. When the electrical energy information is expressed as the maximum value, the current beam position is determined and the coordinates are recorded, which are the laser focus coordinates, such as (10, 10, 50). After completion, the projection of the laser beam is stopped, and the first control mechanism is reset. The height information of the target receptor is input, such as the height information corresponding to the coordinate 10 on the Z axis. The second control mechanism controls the movement of the target receptor so that the surface to be processed of the target receptor is located at the laser focus position, for example, the coordinates are (10, 10, 40) at this time. The laser beam is re-projected to implement surface treatment of the target receptor.

[0054] The present application provides a laser engraving machine, which includes a laser emitting unit for projecting laser rays, and the laser engraving machine also includes a laser focus tracking system. Since the specific structure, functional principle and technical effect of the laser focus recognition device are described in detail above, they will not be repeated here. Any technical content related to the laser focus recognition device can refer to the above records.

[0055] The laser engraving machine can work in two modes, namely fixed position surface treatment mode and fully automatic follow-up positioning mode. Fixed position surface treatment mode means that after confirming the position of the laser beam's ray focus, the surface treatment of the target receptor will be fixed at this position. If the target receptor is replaced, choose whether to reposition the laser focus according to the actual situation of the target receptor. Fully automatic follow-up positioning mode means that the laser focus tracking system also includes the device external terminal function, imports the 3D / 2D drawing of the pre-processed target receptor, selects the origin, and determines the ray focus coordinates of the laser beam for each processing. After confirmation, the target receptor is automatically moved to match the ray focus position according to the drawing size to complete fully automatic focus positioning and surface treatment.

[0056] The present application provides a laser focus recognition method based on a laser focus recognition device, and the laser focus recognition method includes the following steps: projecting a laser beam to a laser receiving area of ​​a laser receiving element, adjusting the beam position where the laser beam intersects with the laser receiving area, and determining the beam focus position of the laser beam according to different electrical energy information generated by the laser receiving element when different beam positions are projected and intersected with the laser receiving area. During the adjustment process, the projection of the laser beam can be kept different, and the position of the laser receiving element can be adjusted relative to the laser beam. In addition, those skilled in the art can also adopt other adjustment methods, which are not limited here.

[0057] In one of the embodiments, the laser focus identification method includes the following steps: selecting a zinc oxide nanowire array as a laser receiving element, and using the array surface of the zinc oxide nanowire array as a laser receiving area; projecting laser rays onto the array surface of the zinc oxide nanowire array, adjusting the ray position where the laser ray intersects with the array surface, and obtaining different electric energy information generated by the zinc oxide nanowire array when different ray positions intersect with the array surface; when the value of the electric energy information is the largest, determining the ray position where the laser ray intersects with the array surface at this time as the ray focus position of the laser ray.

[0058] In one embodiment, the laser focus identification method includes the following steps: converting the electric energy information into current numerical information, and when the current value of the current numerical information is maximum, determining the ray position where the laser ray intersects with the array surface at this time as the ray focus position of the laser ray.

[0059] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A laser focus recognition device, characterized in that: The laser focus recognition device comprises: A laser receiving unit, the laser receiving unit comprising a laser receiving element, the laser receiving element having a laser receiving area, the laser receiving area being used to receive laser rays and generate different electrical energy information according to different ray positions of the received laser rays; An information processing unit, the information processing unit is data-connected with the laser receiving unit and is used to obtain the electrical energy information, and the electrical energy information is used to determine the focus position of the laser beam.

2. The laser focus recognition device according to claim 1, characterized in that: The laser receiving element includes a zinc oxide nanowire array, the array surface of the zinc oxide nanowire array is used to constitute the laser receiving area, and when the array surface receives different ray positions of the laser beam, the electrical energy information generates different values, wherein the value of the electrical energy information is the largest when the array surface receives the ray focus position of the laser beam.

3. The laser focus recognition device according to claim 1, characterized in that: The laser receiving unit also includes: An electronic conversion element, which is data-connected with the laser receiving element and is used to obtain the electric energy information and generate current numerical information based on the electric energy information; the information processing unit is data-connected with the electronic conversion element and is used to obtain the current numerical information and determine the beam focus position of the laser beam based on the current numerical information.

4. The laser focus recognition device according to claim 2 or 3, characterized in that: The information processing unit is further used to generate displacement control information according to the electric energy information or the current value information.

5. A laser focus tracking system, characterized in that: The laser focus tracking system comprises: The laser focus recognition device as claimed in claim 4; A displacement control device is data-connected to the laser focus identification device, and is used to obtain the displacement control information and control the target receptor to move to the beam focus position of the laser beam according to the displacement control information.

6. The laser focus tracking system according to claim 5, characterized in that: The displacement control device comprises: a first control mechanism, the first control mechanism being control-connected to the laser focus identification device and used for controlling the movement of the laser receiving element relative to the laser beam, and assisting the laser receiving element in determining the beam focus position of the laser beam; The second control mechanism is data-connected with the laser focus recognition device, and is used to obtain the displacement control information and control the target receptor to move to the beam focus position of the laser beam according to the displacement control information.

7. A laser engraving machine, characterized in that: The laser engraving machine comprises: A laser emitting unit, wherein the laser emitting unit is used to project laser rays; A laser focus tracking system as claimed in claim 5 or 6.

8. A laser focus recognition method based on the laser focus recognition device according to any one of claims 1 to 4, characterized in that: The laser focus recognition method comprises the following steps: A laser beam is projected onto a laser receiving area of ​​the laser receiving element, and the beam position where the laser beam intersects with the laser receiving area is adjusted. The beam focus position of the laser beam is determined according to different electrical energy information generated by the laser receiving element when different beam positions intersect with the laser receiving area.

9. The laser focus recognition method according to claim 8, characterized in that: The laser focus recognition method comprises the following steps: Selecting a zinc oxide nanowire array as the laser receiving element, and using the array surface of the zinc oxide nanowire array as the laser receiving area; Projecting a laser beam onto the array surface of the zinc oxide nanowire array, adjusting the beam position where the laser beam intersects with the array surface, and obtaining different electrical energy information generated by the zinc oxide nanowire array when different beam positions are projected and intersect with the array surface; When the value of the electric energy information is the largest, the ray position where the laser ray intersects with the array surface at this time is determined as the ray focus position of the laser ray.

10. The laser focus recognition method according to claim 9, characterized in that: The laser focus recognition method comprises the following steps: The electric energy information is converted into current value information. When the current value of the current value information is the largest, the ray position where the laser ray intersects with the array surface is determined as the ray focus position of the laser ray.

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