A focal shifting method for improving distribution density and corresponding laser processing device

Abstract

The present invention discloses a focus translation method for improving distribution density and a corresponding laser processing device. The method comprises the following steps: forming a focus spot by a focusing device; controlling the focusing device to translate a preset distance from an initial position to a new position; wherein the preset distance is the radius of the focus spot; repeating the above process, controlling the focusing device to translate in one direction in sequence under the premise that the focus points do not overlap; and after multiple translations, on the line connecting the adjacent focus points of the focusing device at the initial position, there are only a preset number of focus points of the focusing device at the new position, so that the focus energy density of the focus spot is improved. The present invention uses a unique focus translation method, which can form a preset number of new focus points on the line connecting the adjacent focus points after multiple translations without overlapping, thereby significantly improving the focus energy density of the focus spot.

Description

Technical Field

[0001] The invention relates to a focus translation method for improving distribution density, and also relates to a laser processing device adopting the focus translation method, belonging to the technical field of laser processing. Background Art

[0002] The core of laser beam processing technology lies in the precise control of the focus position and the optimization of energy density, which together determine the quality and efficiency of the processing process. In the field of industrial manufacturing, this type of technology is particularly important. For example, in the process of laser cutting or welding, by accurately adjusting the focus position to the appropriate depth of the material to be processed, combined with a high energy density laser beam, thicker or harder materials can be processed efficiently. This processing method not only increases the processing speed, but also maintains the original properties of the material by controlling the size of the heat-affected zone. In processes such as precision drilling, it also relies on precise control of the focus to achieve high-precision hole processing to meet the high requirements for part accuracy in industries such as electronics and aerospace.

[0003] Precise control of the focal position and energy density is also crucial for medical applications such as skin treatment. In such applications, increasing the energy density of the focal point, that is, increasing the laser power per unit area, can concentrate energy and improve the treatment effect. High-energy-density laser beams can act more precisely on the target area and reduce damage to surrounding healthy tissue, which is particularly important for non-invasive skin treatments and cosmetic surgeries. In addition, in scientific research and imaging technology, high-energy-density lasers provide finer beams, significantly improving imaging resolution and quality, especially in confocal microscopy and super-resolution imaging technology, which can reveal clearer microstructures.

[0004] High energy density laser beams also have advantages in stability and image quality, which is particularly prominent in applications that require high clarity and contrast. Whether in high-resolution imaging in scientific research or in medical imaging, high energy density lasers can provide a stable light source and reduce image noise, thereby improving image clarity and contrast. Such clear images are essential for researchers and doctors to make accurate analysis and diagnosis. In short, precise control of the focus position and effective use of high energy density are key factors driving the continuous innovation and progress of laser beam processing technology. Summary of the invention

[0005] The primary technical problem to be solved by the present invention is to provide a focus translation method for improving distribution density.

[0006] Another technical problem to be solved by the present invention is to provide a laser processing device using the above-mentioned focus translation method.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] According to a first aspect of an embodiment of the present invention, a focus translation method for improving distribution density is provided, comprising the following steps:

[0009] A focusing light spot is formed by a focusing device; wherein the focusing light spot includes a plurality of focusing points, and the plurality of focusing points are periodically and evenly arranged, divided into M units, each unit includes N focusing points, wherein M and N are positive integers;

[0010] Controlling the focusing device to translate a preset distance from an initial position to a new position; wherein the preset distance is the radius of the focusing spot;

[0011] Repeat the above process, and control the focusing device to translate in one direction in sequence under the premise that the focusing focuses do not overlap; and after multiple translations, on the line between adjacent focusing focuses when the focusing device is in the initial position, there are only a preset number of focusing focuses of the focusing device in the new position, so that the focus energy density of the focusing spot is improved.

[0012] Preferably, the multiple focal points of the focused light spot are arranged periodically and at equal distances in the form of a regular polygon; wherein the regular polygon at least includes an equilateral triangle or a square;

[0013] The focused light spot moves once along three preset sides of the periodically arranged equilateral triangle to increase the focal energy density of the focused light spot by 3 times; wherein the three preset sides include two mutually parallel sides and a side connecting the two mutually parallel sides;

[0014] Alternatively, the focused light spot moves once along any three consecutive sides of the same square to increase the focal energy density of the focused light spot by 3 times.

[0015] Preferably, the focus translation method further comprises:

[0016] Providing a movable fixed outer frame; wherein the shape of the movable fixed outer frame matches the shape of the focused light spot, and the size of the movable fixed outer frame is larger than the size of the focused light spot;

[0017] The movable fixed outer frame is arranged around the periphery of the focusing device to form a limiting boundary of the focusing device;

[0018] The focusing device is controlled to translate along the limiting boundary.

[0019] Preferably, the step of providing a movable fixed outer frame comprises the following sub-steps:

[0020] The shape of the focused light spot is obtained by periodically arranging a plurality of focusing points in a preset polygonal manner;

[0021] Determine the corresponding translation direction and translation distance according to the preset polygon;

[0022] Expanding a corresponding topological pattern according to the translation direction, the translation distance and the shape of the focused light spot;

[0023] A movable fixed outer frame of a corresponding shape is provided based on the topological pattern.

[0024] Preferably, the movement mode of the focusing device at least includes: mechanical translation, manual movement or electromagnetic adsorption movement.

[0025] Preferably, an electromagnet is provided on each side of the movable fixed outer frame;

[0026] Controlling the electromagnets on different sides of the movable fixed outer frame to be energized in sequence according to a specific order, so that only the electromagnet on one side is energized at the same time;

[0027] The metal shell of the focusing device is magnetically adsorbed based on the energized electromagnet, so as to drive the focusing device to translate along the inner wall of the movable fixed outer frame.

[0028] According to a second aspect of an embodiment of the present invention, another focus translation method for improving distribution density is provided, comprising the following steps:

[0029] Step 1: placing the focusing device at an initial position, focusing the light beam and forming a focused light spot; wherein the focused light spot includes a plurality of focused focal points; the plurality of focused focal points are divided into M units, each unit includes N focused focal points evenly distributed, and each unit is an equilateral polygon with N sides; when the focusing device is at the initial position, each of the focused focal points is located at a first position, wherein M and N are positive integers;

[0030] Step 2: Control the focusing device to translate a preset distance from an initial position along the direction of a first side of the N sides, so that each focusing point simultaneously moves from the first position to a second position, and the second position is located between the first positions of the two focusing points of the first side of the equilateral polygon;

[0031] Step 3: Control the focusing device to translate a preset distance along the direction of the second side of the N sides, so that each focusing point simultaneously moves from the second position to a third position, and the third position is located between the first positions of the two focusing points of the second side of the equilateral polygon;

[0032] Step 4: Repeat step 3 so that each focusing point moves from the Nth position to the N+1th position simultaneously, and the N+1th position is located between the first positions of the two focusing points of the Nth side of the equilateral polygon.

[0033] Preferably, the second position to the N+1th position are respectively located at the midpoints of the first positions of the two focusing points from the first side to the Nth side.

[0034] Preferably, the focused light spot includes a plurality of sub-light spots, and each of the focused focal points is the center of the corresponding sub-light spot; wherein the preset distance is the radius of each sub-light spot.

[0035] According to a third aspect of an embodiment of the present invention, there is provided a laser processing device, comprising:

[0036] A laser, used for emitting laser light of a preset wavelength;

[0037] A focusing lens, arranged on the light-emitting side of the laser, for focusing the laser to form the focused light spot; wherein the focused light spot includes a plurality of focused points, and the plurality of focused points are periodically arranged in a preset polygonal manner;

[0038] A housing, used for fixing the laser and the focusing lens;

[0039] The moving mechanism is arranged on one side of the shell and is transmission-connected with the shell to drive the shell to move according to the focus translation method.

[0040] Preferably, the moving mechanism comprises:

[0041] A movable fixed outer frame is arranged around the outer side of the housing, and the shape of the movable fixed outer frame matches the preset polygon, and the size of the movable fixed outer frame is larger than the size of the focusing spot;

[0042] A plurality of electromagnets are respectively arranged on each side of the movable fixed outer frame;

[0043] A controller, electrically connected to the plurality of electromagnets, for sequentially controlling the electromagnets on different sides of the movable fixed outer frame to be energized in a specific order, so that only the electromagnets on one side are energized at the same time;

[0044] The electromagnet in the energized state can magnetically adsorb the outer shell to drive the focusing device to translate along the inner wall of the movable fixed outer frame.

[0045] Preferably, the moving mechanism includes a plurality of driving parts and a plurality of push rods; wherein one driving part corresponds to one push rod and corresponds to one of the moving directions of the housing, so as to drive the housing to translate according to the above-mentioned focus translation method;

[0046] Alternatively, the moving mechanism includes a polygonal center back rod and a plurality of electromagnets, wherein the polygonal center back rod is arranged on the back of the focusing lens, and the plurality of electromagnets are arranged on the outside of the housing and are respectively located at a plurality of preset positions, and are used to magnetically adsorb the polygonal center back rod, thereby driving the housing to translate according to the above-mentioned focus translation method;

[0047] Alternatively, the moving mechanism includes a slider and a driving unit, the slider slidingly cooperates with a zigzag slide rail arranged on the back of the focusing lens, and the slider is connected to a power output end of the driving unit, so that the slider is driven by the driving unit to move along the zigzag slide rail, thereby driving the outer shell to translate according to the above-mentioned focus translation method.

[0048] Preferably, the focusing lens is a fly-eye lens array, and the arrangement of the fly-eye lens array includes at least: 2-3-2, 3-4-5-4-3, 4-5-6-7-6-5-4; wherein each number represents the number of fly-eye lenses in each row or column.

[0049] Compared with the prior art, the present invention has the following technical effects:

[0050] 1. Improve focus energy density: Through a unique focus translation method, a preset number of new focus points can be formed on the line between adjacent focus points after multiple translations without overlapping, thereby significantly improving the focus energy density of the focused spot.

[0051] 2. Uniform distribution of focus: A compound eye lens array with equilateral triangles or squares as units is used to form a hexagonal or rectangular focusing spot. By translating the preset distance along different sides, the focus distribution density of the laser processing area can be improved after multiple positions to ensure the uniformity of energy distribution.

[0052] 3. Optimize laser processing effects: High focus density and uniform energy distribution help improve the efficiency and quality of laser processing, especially in application scenarios that require high precision and high energy input, such as precision drilling, cutting or welding.

[0053] 4. Flexible translation control: Through mechanical movement, manual movement or electromagnetic adsorption, the focusing device can be accurately translated to ensure that the focus moves in a predetermined pattern and sequence to optimize the laser processing process.

[0054] 5. Improve the applicability of laser processing devices: The laser processing device includes a laser, a focusing lens, a housing and a moving mechanism. The design allows the device to be precisely controlled according to the focus translation method, which improves the applicability and flexibility of the laser processing device. The design of the moving mechanism allows the translation of the focusing device through electromagnetic adsorption, a drive unit and a push rod or a slider and a zigzag slide rail, etc., which increases the operational flexibility and accuracy of the laser processing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A flow chart of a focus translation method for improving distribution density provided by the first embodiment of the present invention;

[0056] Figure 2 is a schematic diagram of a focused light spot in the first embodiment of the present invention;

[0057] Figure 3A It is a schematic diagram of the focus spot before and after translation in the first embodiment of the present invention;

[0058] Figure 3B This is a schematic diagram of the translation process of the focus spot in the first embodiment of the present invention;

[0059] Figure 4A This is a schematic diagram of another focused light spot before and after translation in the first embodiment of the present invention;

[0060] Figure 4B This is a schematic diagram of another translation process of the focused light spot in the first embodiment of the present invention;

[0061] Figure 5 A schematic structural diagram of a laser processing device (focusing device) provided in accordance with a third embodiment of the present invention;

[0062] Figure 6 FIG. 4 is a schematic structural diagram of a moving mechanism in the third embodiment of the present invention. DETAILED DESCRIPTION

[0063] The technical content of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0064] The technical concept of the embodiment of the present invention is: using a relatively large focal array spacing, while ensuring that the energy of a single focal point is sufficiently high, through further translational action, to achieve a uniform increase in the focal array density on the surface of the area to be processed. In this way, it is ensured that the laser energy of a single focal point is sufficient (requiring a larger focal spacing), and an effective focal density increase is achieved (requiring a smaller focal spacing), thereby improving the effectiveness of laser beam processing.

[0065] First embodiment

[0066] like Figure 1As shown, a focus translation method for improving distribution density provided by the first embodiment of the present invention specifically includes steps S1 to S4:

[0067] S1: A focusing light spot is formed by a focusing device.

[0068] In one embodiment of the present invention, Figure 5 As shown, the focusing device is composed of a laser 1, a focusing lens 2 and a housing 3. The housing 3 is used to fix the laser 1 and the focusing lens 2, and the laser 1 is used to emit laser light of a preset wavelength. The focusing lens 2 is arranged on the light-emitting side of the laser 1 to focus the laser light to form a focused light spot.

[0069] Specifically, Figure 2 As shown, in one embodiment of the present invention, the focused light spot 10 includes a plurality of sub-spots 11, each of which corresponds to a focusing focus 12 (i.e., a black dot at the center of each light spot 11), and all sub-spots together constitute a regular hexagonal focused light spot 10. Preferably, the focused light spot 10 is located at the beam waist position of the focusing lens 2. Figure 4A As shown, in another embodiment, the multiple focusing points of the focusing spot 10 are periodically arranged in a square manner (in other words, the multiple focusing points are divided into M units, each unit includes N focusing points evenly distributed, and each unit is an equilateral polygon with N sides), so as to be arranged together into a square or rectangular focusing spot 10. Here, M and N are both positive integers, the same below.

[0070] It is understandable that the specific shape of the focused light spot 10 can be adaptively adjusted as needed and is not limited here. However, it should be noted that in order to ensure the energy intensity of a single focused focus 12, the diameter of each sub-spot 11 (i.e., the focal period) needs to be no less than a preset value (e.g., 2 to 10 mm).

[0071] S2: Control the focusing device to translate from the initial position along a preset direction for a preset distance to increase the focal energy density of the focused light spot 10 .

[0072] Specifically, it includes steps S21 to S23:

[0073] S21: Determine the translation direction.

[0074] like Figure 3A As shown, in one embodiment of the present invention, since the multiple focus points of the focusing spot 10 are periodically arranged in an equilateral triangle manner, a regular hexagonal focusing spot 10 is formed. Therefore, when the focusing spot 10 needs to be moved, it needs to be translated in the direction of the three preset sides of the equilateral triangle. The three preset sides include two parallel sides and a side connecting the two parallel sides.

[0075] Specifically, Figure 3B As shown, N=3 is used as an example for explanation. The moving direction of the focused light spot 10 is: when the focusing device is at the initial position, each focus is located at the first position 100 of the focus. The area surrounded by the focus points on the outermost periphery of the focused light spot is the laser processing area 500 with uniform light intensity. The first horizontal translation to the left is to the second position 200, the second translation to the upper left and at an angle of 60° to the horizontal direction is to the third position 300, and the third horizontal translation to the right is to the fourth (N+1) position 400. At this time, as Figure 3B As shown, it can be seen that the area of ​​the laser processing region 500A is increased (larger than the original laser processing region 500), and the focus energy density is increased to 3 times.

[0076] Similar, such as Figure 4A As shown, in another embodiment, multiple focus points of the focus spot 10 are periodically arranged in a square manner, thereby forming a rectangular focus spot 10. Therefore, when the focus spot 10 needs to be moved, it needs to be translated in the direction of the side of the square. In addition, it should be noted that when translating in the direction of the side of the square, it is only necessary to move three times along three consecutive sides. If it moves once along the four sides of the square, there will be a problem of focus duplication, which will cause uncontrollable damage to the laser processing area.

[0077] Specifically, Figure 4B As shown, the moving directions of the focused light spot 10 are: first horizontal translation to the left, second vertical translation upward, and third horizontal translation to the right.

[0078] In addition, it can be understood that only two moving modes are listed in this embodiment, but it does not constitute a limitation of the present invention. In other embodiments, the moving direction of the focusing spot 10 can be adaptively adjusted according to different focusing focus arrangement modes.

[0079] S22: Determine the translation distance.

[0080] In one embodiment of the present invention, the translation distance is 1 / 2 of the length of the side corresponding to the preset direction, that is, the distance that the focused light spot translates along one side of the regular polygon each time is 1 / 2 of the focal period.

[0081] It can be understood that after each translation, the focus line density on the edge is doubled, so after N translations, the focus energy density of the focused light spot 10 can be increased N times.

[0082] S23: Control the focusing device to complete a translation cycle.

[0083] Specifically, after the translation direction of each translation is determined based on step S21 and the distance of each translation is determined based on step S22, the focusing device is controlled to translate once along multiple preset edges of the preset polygon, thereby completing a translation cycle.

[0084] It is understandable that if Figure 3B As shown in , the focusing device needs to move 3 times to complete a translation cycle. After 3 translations, the focus energy density of the focused light spot is 4 times the focus energy density before the movement (i.e., the focus density is increased by 3 times). Similarly, Figure 4B As shown in FIG. 1 , the focusing device needs to move three times to complete a translation cycle. After three translations, the focus energy density per unit area of ​​the focused spot is four times the focus energy density before the movement (i.e., the focus density is increased by three times).

[0085] In one embodiment of the present invention, after the focusing device completes a translation cycle, the original focused light spot 10 can improve the focus energy density of the focused light spot 10 without overlap and omission. The no omission mentioned here means that each focus when the focusing device is in the initial position should be taken into account. That is, after multiple translations, on the line between adjacent focus points when the focusing device is in the initial position, there are only a preset number (for example, 1) of focus points of the focusing device in the new position. No overlap means that the focus points do not overlap. Among them, overlap means moving one radius each time, and moving twice in the same direction is one diameter, which is equivalent to moving one focus point in the initial position to the position where another focus point is located.

[0086] In the above embodiment, the movement mode of the focusing device includes at least mechanical translation, manual movement, or electromagnetic adsorption movement, among which the electromagnetic adsorption translation mode is the best. Specifically, the electromagnetic adsorption movement refers to setting an electromagnet in one or two of the six groups of edges that need to be moved and attached on the outer shell and / or the movable fixed outer frame (which can be provided additionally) of the focusing device, and can realize adsorption, attachment and disconnection in a specific order, and then through multiple electromagnet controls, the translation action of the entire focusing device can be completed.

[0087] Specifically, the specific process of the electromagnetic adsorption translation includes steps S231 to S234:

[0088] S231 : providing a movable fixed outer frame 41 , and disposing an electromagnet on each side of the movable fixed outer frame 41 .

[0089] In one embodiment of the present invention, Figure 3AFirst, a regular hexagonal focused light spot 10 is obtained by periodically arranging multiple focusing points in an equilateral triangle manner. Second, the three translation directions and translation distances are determined based on the equilateral triangle. Third, the corresponding topological pattern (i.e. Figure 3A Finally, a movable fixed outer frame 41 of a corresponding shape is provided based on the topological pattern.

[0090] It can be understood that the shape of the movable fixed outer frame 41 matches the shape of the focusing spot 10, and the size of the movable fixed outer frame 41 is larger than the size of the focusing spot 10. Figure 3A As shown, in one embodiment of the present invention, the focusing spot 10 is a regular hexagon, and the movable fixed outer frame 41 is an unequal hexagon. 12 =Side 23 =Side 45 =Side 56 , and the lengths of these four sides are the side of the focused spot 10 plus 1 / 2 focal length; and 16 =Side 34 <Side 12 , and the lengths of these two sides are equal to the sides of the focusing spot 10. Therefore, the unequal hexagonal movable fixed outer frame 41 can match the three movements of the focusing spot 10 to increase the focus density by 3 times.

[0091] S232: The movable fixed outer frame is arranged around the periphery of the focusing device to form a limiting boundary of the focusing device.

[0092] S233: Controlling the electromagnets on different sides of the mobile fixed outer frame to be energized in sequence according to a specific order, so that only the electromagnet on one side is energized at the same time.

[0093] S234: The metal shell of the focusing device is magnetically adsorbed based on the energized electromagnet to drive the focusing device to translate along the limit boundary of the movable fixed outer frame.

[0094] Second embodiment

[0095] The second embodiment of the present invention also provides another focus translation method for improving distribution density, which specifically includes steps S10 to S40:

[0096] S10: The focusing device is placed at an initial position to focus the light beam and form a focused light spot.

[0097] The focused light spot includes a plurality of focusing points, which are divided into M units, each unit includes N focusing points evenly distributed, and each unit is an equilateral polygon with N sides; when the focusing device is located at the initial position, each focusing point is located at the first position.

[0098] S20: Control the focusing device to translate a preset distance from the initial position along the direction of the first side of the N sides, so that each focus point simultaneously moves from the first position to the second position, wherein the second position is located between the first positions of the two focus points of the first side of the equilateral polygon.

[0099] S30: Control the focusing device to translate a preset distance along the direction of the second side of the N sides, so that each focus point simultaneously moves from the second position to the third position, wherein the third position is located between the first positions of the two focus points on the second side of the equilateral polygon.

[0100] S40: Repeat step S30, so that each focus point is simultaneously moved from the Nth position to the N+1th position, and the N+1th position is located between the first positions of the two focus points on the Nth side of the equilateral polygon.

[0101] In one embodiment of the present invention, preferably, the second position to the N+1th position are respectively located at the midpoint of the first position of the two focusing points on the first side to the Nth side. In addition, the focusing spot includes a plurality of sub-spots, each focusing point is the center of the corresponding sub-spot, and the preset distance is the radius of each sub-spot.

[0102] Third embodiment

[0103] like Figure 5 As shown, based on the above-mentioned first embodiment or second embodiment, the third embodiment of the present invention further provides a laser processing device, including a laser 1, a focusing lens 2, a housing 3 and a moving mechanism 4.

[0104] Specifically, in one embodiment of the present invention, the laser 1 can be arranged above the laser processing area. The focusing lens 2 is arranged on the light-emitting side of the laser to focus the laser to form a focused light spot. Specifically, the focusing lens 2 is a fly-eye lens array, which is arranged on the light-emitting side of the laser, and is composed of a plurality of fly-eye lenses arranged together in a hexagonal array. The hexagonal fly-eye lens array can be arranged in array forms such as 2-3-2, 3-4-5-4-3, 4-5-6-7-6-5-4, etc. Different array forms correspond to different numbers of fly-eye lenses, which can be adaptively selected according to needs. Among them, each fly-eye lens forms a sub-spot 11 at the laser focusing position, and each sub-spot 11 corresponds to a focus 12 (i.e., a black dot at the center of each spot 11), and the sub-spots formed by all fly-eye lenses together constitute a focused light spot 10, and the distance between two adjacent focuses is equal to the aperture of the fly-eye lens. Preferably, the focused light spot 10 is located at the beam waist position of the fly-eye lens array.

[0105] The housing 3 is used to fix the laser 1 and the focusing lens 2, to provide a mounting base for the two, and to fix the relative positions of the two. Preferably, a collimator 5 can also be arranged between the laser 1 and the focusing lens 2, to collimate the laser emitted by the laser 1.

[0106] The moving mechanism 4 is disposed on one side of the housing 1 and is in transmission connection with the housing 1 to drive the housing 1 to translate according to the focus translation method provided in the first embodiment or the second embodiment. Figure 6 As shown, in one embodiment of the present invention, the moving mechanism 4 includes a moving fixed outer frame 41, a plurality of electromagnets 42 and a controller 43. The moving fixed outer frame 41 is in a regular hexagonal shape and is arranged outside the housing 3. The size of the moving fixed outer frame 41 is larger than the size of the focusing spot 10, thereby forming a limit boundary. The plurality of electromagnets 42 are respectively arranged on each side of the moving fixed outer frame 41. The controller 43 is electrically connected to the plurality of electromagnets 42 and is used to control the on and off of the electromagnets 42.

[0107] In one embodiment of the present invention, the controller 43 controls the electromagnets 42 on different sides of the movable fixed outer frame to be energized in sequence in a specific order, so that only the electromagnets 42 on one side are energized at the same time. Thus, the electromagnets in the energized state can magnetically adsorb the outer shell, thereby driving the focusing device to translate along the inner wall of the movable fixed outer frame (i.e., to translate according to the focus translation method provided in the first embodiment or the second embodiment).

[0108] In another embodiment, the moving mechanism 4 may further include a plurality of driving parts and a plurality of push rods; wherein one driving part corresponds to one push rod and corresponds to one of the moving directions of the housing, so as to drive the housing to translate according to the focus translation method provided in the first embodiment or the second embodiment. In yet another embodiment, the moving mechanism 4 may further include a polygonal center back rod and a plurality of electromagnets, wherein the polygonal center back rod is disposed on the back of the focusing lens, and the plurality of electromagnets are disposed on the outside of the housing and are respectively located at a plurality of preset positions, for magnetically adsorbing the polygonal center back rod, thereby driving the housing to translate according to the focus translation method in the first embodiment or the second embodiment. In other embodiments, the moving mechanism may further include a slider and a driving part, wherein the slider is slidably matched with a zigzag slide rail disposed on the back of the focusing lens, and the slider is connected to the power output end of the driving part, so as to drive the slider to move along the zigzag slide rail through the driving part, thereby driving the housing to translate according to the focus translation method provided in the first embodiment or the second embodiment.

[0109] It is understandable that the above only lists several specific implementations of the moving mechanism 4. In other embodiments, the moving mechanism may also include other various embodiments, which only need to move in a preset direction and sequence.

[0110] It should be noted that after in-depth research, the inventors found that in the spectral region with a wavelength of 900 to 1300nm, the optical loss is relatively small, which makes the laser in this wavelength range have significant advantages in medical applications. Especially in the field of skin treatment, the use of lasers in this wavelength range can achieve a deeper skin penetration depth of 3 to 5mm, thereby effectively treating the deep tissues of the skin. Specifically, when the laser emits a laser with a wavelength of 900 to 1300nm, its power is controlled below 400W / cm². In this spectral region, the absorption coefficients of different skin components are also different: the absorption coefficient of oxygenated hemoglobin is about 0.2 to 0.4 / cm, the absorption coefficient of deoxyhemoglobin is about 0.7 to 0.85 / cm, the absorption coefficient of melanin is about 4 to 7 / cm, and the absorption coefficient of water is about 0.16 to 0.2 / cm. These parameters are crucial to optimizing the effect of laser treatment.

[0111] In summary, the focus translation method for improving distribution density and the corresponding laser processing device provided by the embodiments of the present invention have the following beneficial effects:

[0112] 1. Improve focus energy density: Through a unique focus translation method, a preset number of new focus points can be formed on the line between adjacent focus points after multiple translations without overlapping, thereby significantly improving the focus energy density of the focused spot.

[0113] 2. Uniform distribution of focus: A compound eye lens array with equilateral triangles or squares as units is used to form a hexagonal or rectangular focusing spot. By translating the preset distance along different sides, the focus distribution density of the laser processing area can be improved after multiple positions to ensure the uniformity of energy distribution.

[0114] 3. Optimize laser processing effects: High focus density and uniform energy distribution help improve the efficiency and quality of laser processing, especially in application scenarios that require high precision and high energy input, such as precision drilling, cutting or welding.

[0115] 4. Flexible translation control: Through mechanical movement, manual movement or electromagnetic adsorption, the focusing device can be accurately translated to ensure that the focus moves in a predetermined pattern and sequence to optimize the laser processing process.

[0116] 5. Improve the applicability of laser processing devices: The laser processing device includes a laser, a focusing lens, a housing and a moving mechanism. The design allows the device to be precisely controlled according to the focus translation method, which improves the applicability and flexibility of the laser processing device. The design of the moving mechanism allows the translation of the focusing device through electromagnetic adsorption, a drive unit and a push rod or a slider and a zigzag slide rail, etc., which increases the operational flexibility and accuracy of the laser processing device.

[0117] It should be noted that the above embodiments are only examples, and the technical solutions of the various embodiments can be combined, all within the protection scope of the present invention.

[0118] It should be noted that the terms "depth", "up", "down", "horizontal", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0119] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0120] The focus translation method for improving the distribution density and the corresponding laser processing device provided by the present invention are described in detail above. For those skilled in the art, any obvious changes made to it without departing from the essence of the present invention will constitute an infringement of the patent right of the present invention and will bear the corresponding legal liability.

Claims

1. A focus shifting method for improving distribution density, used for performing focus shifting on a focusing device of a laser processing device, characterized in that: The laser processing device comprises: A focusing device, the focusing device is composed of a laser, a focusing lens and a housing; wherein the laser is used to emit laser light of a preset wavelength; the focusing lens is arranged on the light-emitting side of the laser and is used to focus the laser light to form a focused light spot; the focused light spot includes a plurality of focusing points, and the plurality of focusing points are periodically arranged in a preset polygonal manner; the housing is used to fix the laser and the focusing lens; A moving mechanism, the moving mechanism comprising a moving fixed outer frame, a plurality of electromagnets and a controller; wherein the moving fixed outer frame is arranged on the outer side of the shell, and the shape of the moving fixed outer frame matches the preset polygon, and the size of the moving fixed outer frame is larger than the size of the focusing spot; the plurality of electromagnets are respectively arranged on each side of the moving fixed outer frame; the controller is electrically connected to the plurality of electromagnets, and is used to control the electromagnets on different sides of the moving fixed outer frame to be energized in sequence according to a specific order, so that only the electromagnets on one side are in an energized state at the same time; the electromagnets in the energized state are used to magnetically adsorb the shell, so as to drive the focusing device to translate along the inner wall of the moving fixed outer frame; The focus translation method comprises the following steps: A focusing light spot is formed by a focusing device; wherein the focusing light spot includes a plurality of focusing points, and the plurality of focusing points are periodically arranged at equal distances in the form of a regular polygon, and are divided into M units, each unit includes N focusing points, wherein M and N are positive integers; The shape of the focusing spot is obtained, and the direction of the preset side of the regular polygon is used as the translation direction of the focusing spot for a single movement, and the translation distance of each time is 1 / 2 of the focus period; a corresponding topological pattern is developed according to the translation direction, the translation distance and the shape of the focusing spot; a movable fixed outer frame of a corresponding shape is provided based on the topological pattern; the movable fixed outer frame is arranged around the periphery of the focusing device to form a limiting boundary of the focusing device; the focusing device is controlled to translate along the limiting boundary so that the focusing device translates a preset distance from an initial position to a new position; wherein the shape of the movable fixed outer frame matches the shape of the focusing spot, and the size of the movable fixed outer frame is larger than the size of the focusing spot; the preset distance is the radius of the focusing spot; Repeat the above process, and control the focusing device to translate in one direction in sequence under the premise that the focusing focuses do not overlap; and after multiple translations, on the line between adjacent focusing focuses when the focusing device is in the initial position, there are only a preset number of focusing focuses of the focusing device in the new position, so that the focus energy density of the focusing spot is improved.

2. The focus shifting method according to claim 1, wherein: The regular polygon at least includes an equilateral triangle or a square; The focused light spot moves once along three preset sides of the periodically arranged equilateral triangle to increase the focal energy density of the focused light spot by 3 times; wherein the three preset sides include two mutually parallel sides and a side connecting the two mutually parallel sides; Alternatively, the focused light spot moves once along any three consecutive sides of the same square to increase the focal energy density of the focused light spot by 3 times.

3. The focus shifting method according to claim 1, wherein: An electromagnet is arranged on each side of the movable fixed outer frame; Controlling the electromagnets on different sides of the movable fixed outer frame to be energized in sequence according to a specific order, so that only the electromagnet on one side is energized at the same time; The metal shell of the focusing device is magnetically adsorbed based on the energized electromagnet, so as to drive the focusing device to translate along the inner wall of the movable fixed outer frame.

4. The focus shifting method according to claim 1, wherein: The moving mechanism includes a plurality of driving parts and a plurality of push rods; wherein one driving part corresponds to one push rod and corresponds to one of the moving directions of the shell to drive the shell to move in translation.

5. The focus shifting method according to claim 1, wherein: The moving mechanism includes a polygonal center back rod and multiple electromagnets. The polygonal center back rod is arranged on the back side of the focusing lens. The multiple electromagnets are arranged on the outside of the shell and are respectively located at multiple preset positions, which are used to magnetically adsorb the polygonal center back rod, thereby driving the shell to translate.

6. The focus translation method according to claim 1, wherein: The moving mechanism includes a slider and a driving part. The slider is slidably matched with a zigzag slide rail arranged on the back of the focusing lens, and the slider is connected to the power output end of the driving part so that the slider is driven by the driving part to move along the zigzag slide rail, thereby driving the shell to translate.

7. The focus shifting method according to claim 1, wherein: The focusing lens is a fly-eye lens array, and the arrangement of the fly-eye lens array includes at least: 2-3-2, 3-4-5-4-3, 4-5-6-7-6-5-4; wherein each number represents the number of fly-eye lenses in each row or column.

8. The focus translation method according to claim 1, wherein: The preset wavelength is 900-1300 nm.

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