Laser focusing mechanism and laser processing equipment

Abstract

Laser focusing mechanism, characterized in that the laser focusing mechanism comprises a laser head, at least one visible laser generator and a lifting frame; wherein the visible laser generator is provided in the laser head, wherein the laser head and the visible laser generator emit at least two visible laser beams whose optical paths intersect, wherein the laser head is arranged on a lifting frame, wherein the lifting frame is configured to move the laser head along the Z-direction and to allow the light spots of the visible laser beams to overlap in order to achieve focusing.

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of laser processing and in particular to a laser focusing mechanism and laser processing equipment. STATE OF THE ART

[0002] Laser processing equipment is a device that uses laser beams to perform engraving, cutting, and other processing operations on materials. When using laser processing equipment for material processing, the positioning and adjustment of the laser focal point directly affect the efficiency and processing quality of the equipment. Existing laser processing equipment is typically used to process a specific material. The focal point position is determined by observing the changes in the laser beam or the processing effect on the sample at different positive and negative defocus distances.Although focusing can be achieved using this method, it requires actual processing operations and a high level of expertise from the operator, which limits the application range of the laser processing equipment, increases the complexity of the focusing process and reduces focusing efficiency, and can also lead to eye damage for the operator.

[0003] Therefore, it is urgently necessary to provide a laser focusing mechanism and laser processing equipment that are relatively simple and easy to use and place low professional demands on the operator. CONTENT OF THE PRESENT APPLICATION

[0004] The purpose of the present application is to solve the aforementioned problems and to provide a laser focusing mechanism and laser processing equipment, wherein the laser focusing mechanism has a simple structure, a simple operating principle, convenient operation and high efficiency of the focusing process.

[0005] To solve the aforementioned technical problems, the present application uses the following technical solutions: In a first aspect, the present application provides a laser focusing mechanism comprising a laser head, at least one visible laser generator, and a lifting frame; wherein the visible laser generator is provided in the laser head, wherein the laser head and the visible laser generator emit at least two visible laser beams whose optical paths intersect, wherein the laser head is arranged on a lifting frame, wherein the lifting frame is configured to move the laser head along the Z-direction and to allow the light spots of the visible laser beams to overlap in order to achieve focusing.

[0006] Optionally, the generator for visible lasers is provided to be inclined at a preset angle on the laser head; whereby it can be seen at the beginning that the laser beams cross and overlap, thus forming an initial focal point.

[0007] Optionally, the preset angle is intended to be 65° to 75°.

[0008] Optionally, the laser head is configured to emit a first visible laser beam along the z-direction; wherein a single visible laser generator is provided, the visible laser beam emitted by the visible laser generator being a second visible laser beam; wherein the optical path of the second visible laser beam is inclined from the emitting end of the visible laser generator in the direction near the first visible laser beam.

[0009] Optionally, the laser head is configured to emit a first invisible laser beam along the z-direction; wherein two visible laser generators are provided, the visible laser generators being arranged opposite each other along the radial direction of the laser head and emitting a third visible laser beam and a fourth visible laser beam, the optical paths of the third visible laser beam and the fourth visible laser beam being inclined from the emitting end of the visible laser generator in the direction near the invisible laser beam.

[0010] Optionally, the laser focusing mechanism may further include a processing table surface, the processing table surface being configured to place the material to be processed, the laser head and the emitting end of the visible laser generator being directed towards the processing table surface, the laser head being driven by the lifting frame to move towards or away from the processing table surface along the Z-direction.

[0011] Optionally, the laser focusing mechanism may also include a visual detection unit, the visual detection unit being configured to detect the distribution of the light spots projected by the visible laser beam.

[0012] Optionally, the laser focusing mechanism may also include a control unit, the control unit being electrically connected to the visual detection unit or the lifting frame, the control unit controlling the lifting frame according to the detection result transmitted by the visual detection unit in order to adjust the position of the laser head.

[0013] Optionally, the wavelength of the visible laser beam can be between 380 nm and 780 nm.

[0014] In a second aspect, the present application provides laser processing equipment that includes the laser focusing mechanism described above.

[0015] The present application brings at least the following beneficial effects: The laser focusing mechanism of the present application consists of mounting a visible laser generator on the laser head, wherein the laser head and the visible laser generator emit at least two visible laser beams whose optical paths intersect; during use, the position of the focal plane is predetermined before leaving the factory and the visible laser generator is set to a preset angle so that the light spots of the visible laser beams overlap; in the subsequent use process, after changing the material to be processed with different thicknesses, the user only needs to adjust the raising and lowering of the laser head with the lifting frame according to the thickness of the material to be processed, so that the light spots of the visible laser beam coincide on the surface of the material to be processed in order to achieve focusing;The laser focusing mechanism of the present application does not require lengthy processes such as the actual processing and subsequent effect observation to determine the focal length position during the focusing process; the focusing process is simple, places low technical demands on the operator, and is widely applicable. BRIEF DESCRIPTION OF THE DRAWING Fig. Figure 1 is a schematic structural representation of a laser focusing mechanism when a laser head of the present application emits a visible laser beam; Fig. Figure 2 is a schematic structural representation of a laser focusing mechanism when a laser head of the present application emits a non-visible laser beam; Fig. Figure 3 is a schematic representation of the operating principle of the laser focusing mechanism of the present application; Fig. Figure 4 is a flowchart of the setting of the laser focusing mechanism of the present application.

[0016] 1-Laser head, 2-Visible laser generator, 3-Stroke frame, 4-First visible laser beam, 5-Second visible laser beam, 6-Third visible laser beam, 7-Fourth visible laser beam, 8-Working table surface, 9-Visual detection unit, 10-Control unit. DETAILED DESCRIPTION

[0017] To facilitate understanding of the present application, it is described in more detail below with reference to the corresponding drawings. The preferred embodiments of the present application are illustrated in the accompanying drawings. However, the present application can be implemented in many different forms and should not be interpreted as being limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and complete.

[0018] It should be noted that when an element is described as "attached" to another element, it can be located directly on top of the other element, or there can be an intervening element. Similarly, when an element is described as "connected" to another element, it can be directly attached to the other element, or there can be an intervening element.

[0019] The descriptions relating to ‘first’, ‘second’ and the like in the present application serve only the purpose of description and should not be understood as indicating or implying their relative significance or implicitly explaining the set of technical features specified.

[0020] In describing the present application, the orientations or positional relationships shown are those based on the drawings and are provided only for convenience in describing the present application and for simplifying the description, rather than indicating or implying that the device or element in question must have a particular orientation or orientation or be designed and operated in a particular orientation, and should therefore not be construed as limiting the present application. Examples of implementation:

[0021] In a first aspect, the present application provides a laser focusing mechanism as described in Fig. 1 and Fig. Figure 2 shows a laser head 1, comprising at least one visible laser generator 2 and a lifting frame 3; wherein the visible laser generator 2 is provided in the laser head 1, wherein the laser head 1 and the visible laser generator 2 emit at least two visible laser beams whose optical paths intersect, wherein the laser head 1 is arranged on a lifting frame 3, wherein the lifting frame 3 is configured to move the laser head 1 along the Z-direction and to allow the light spots of the visible laser beams to overlap in order to achieve focusing.

[0022] The laser focusing mechanism of the present application is equipped with the visible laser generator 2 on the laser head 1, wherein the laser head 1 and the visible laser generator 2 emit at least two visible laser beams whose optical paths intersect. During use, the position of the focal plane is predetermined before leaving the factory, and the visible laser generator 2 is set to a preset angle such that the light spots of the visible laser beams overlap; as shown in Fig. As shown in Figure 4, in the subsequent usage process, after changing the material to be processed with different thicknesses, the user only needs to adjust the raising and lowering of the laser head 1 with the lifting frame 3 according to the thickness of the material to be processed, so that the light spots of the visible laser beam coincide on the surface of the material to be processed in order to achieve focusing; the laser focusing mechanism of the present application does not require lengthy processes such as the actual processing and subsequent effect observation to determine the focal length position during the focusing process, the focusing process is simple, places low technical demands on the operator and is widely applicable.

[0023] The generator 2 for visible laser is inclined at a preset angle on the laser head 1; it can be seen at the beginning that the laser beams cross and overlap, thus forming an initial focal point.

[0024] The preset angle is 65° to 75°.

[0025] The preset angle is related to the distance between the light output center of laser head 1 and the light output center of generator 2 for visible lasers, as well as to the working distance of laser head 1. When laser head 1 and generator 2 for visible lasers intersect at the focal point, the focal point, the light output center of laser head 1, and the light output center of generator 2 for visible lasers form a right-angled triangle; the distance between the light output center of laser head 1 and the light output center of generator 2 for visible lasers is recorded as 'a', while the working distance of laser head 1 is recorded as 'b', with the preset angle being recorded as θ, 'a' and 'b' corresponding to the values ​​of the two right-angled sides of the right-angled triangle, and the formula for calculating the preset angle is: θ = arctan(b / a).For example, in one embodiment of the present application, the value of a is 85 mm, the value of b is 180 mm to 300 mm, and the calculated value of θ is 65° to 75°; specifically, when the value of b is, for example, 180 mm, 230 mm, 250 mm, 280 mm, and 300 mm, the corresponding inverse trigonometric function values ​​are 1.130, 1.217, 1.243, 1.276, and 1.295, respectively, and the corresponding value of θ is 64.722°, 69.717°, 71.222°, 73.113°, and 74.181°.

[0026] Optionally, the laser head 1 and the generator 2 for visible laser can be arranged in a variety of coordinated mounting methods within the laser focusing mechanism. For example, in some embodiments, specifically with regard to Fig. 1, the laser head 1 is configured to emit a first visible laser beam 4 along the z-direction; a single visible laser generator 2 is provided, the visible laser beam emitted by the visible laser generator 2 being a second visible laser beam 5; the optical path of the second visible laser beam 5 is inclined from the emitting end of the visible laser generator 2 in the direction close to the first visible laser beam 4. It should be noted that the z-direction is defined as parallel to the z-axis direction in the spatial coordinate system. Optionally, the visible laser generator 2 is provided to be mounted at a preset angle on the lower surface of the laser head 1.During operation, prior to delivery of the equipment, the position of the focal plane is first determined. Then, the visible laser generator 2 is mounted at a preset angle on the lower surface of the laser head 1. When positioned within the focal plane, the two light spots—one from the first visible laser beam 4 emitted vertically by the laser head 1 and the other from the second visible laser beam 5 emitted obliquely by the visible laser generator 2—perfectly overlap, thus achieving focus. During processing, the user adjusts the position of the laser head 1 using the lifting frame 3, according to the thickness of the material being processed.The laser head 1 is controlled so that it moves up and down along the z-direction, so that the light spots of the first visible laser beam 4 and the second visible laser beam 5 projected onto the surface of the material to be processed overlap and thus the focusing is achieved.

[0027] In other embodiments, specifically with reference to Fig. 2. The laser head 1 is configured to emit an invisible laser beam along the z-direction. Two visible laser generators 2 are provided, the visible laser generators 2 being arranged opposite each other along the radial direction of the laser head 1 and emitting a third visible laser beam 6 and a fourth visible laser beam 7, the optical paths of the third visible laser beam 6 and the fourth visible laser beam 7 being inclined from the emitting end of the visible laser generator 2 in the direction close to the invisible laser beam. In use, the visible laser generators 2 are mounted on both sides of the lower surface of the laser head 1 at preset angles.During operation, the position of the focal plane is first determined on the equipment before it leaves the factory. When the visible laser generator 2 is located in the focal plane, the light spots of the two visible laser beams emitted obliquely from the two visible laser generators 2 just overlap, thus achieving focus. During processing, the user moves the laser head 1 up and down in the Z-direction according to the thickness of the material being processed by adjusting the lifting frame. This moves the visible laser generator 2 in the Z-direction, causing the light spots projected onto the surface of the material by the third visible laser beam 6 and the fourth visible laser beam 7 to overlap, thus completing the focusing process.In further embodiments, the laser focusing mechanism also includes a visual detection unit 9 and a control unit 10. As in . Fig.As shown in Figure 3, the control unit 10 is electrically connected to the visual sensing unit 9 and the lifting frame 3. The visual sensing unit 9 is configured to detect the distribution of the light spots projected by the visible laser beam. The control unit 10 controls the lifting frame 3 according to the detection result transmitted by the visual sensing unit 9 to adjust the position of the laser head 1. Through automatic control between the visual sensing unit 9 and the control unit 10, the laser focusing mechanism, during actual operation, uses a visual algorithm to assess the alignment of the light spots in order to automatically control the lifting frame 3. This enables an automatic focusing process without manual operation, improving the efficiency and accuracy of the focusing process and enhancing user comfort and the user experience.Optionally, the visual acquisition unit is provided to include a CCD camera which is arranged on the processing table surface 8, and the CCD camera is configured to take an image of the light spots projected onto the processing table surface 8.

[0028] The wavelength of the visible laser beam is between 380 nm and 780 nm. For example, the visible laser beam can be blue light with a wavelength of 450 nm or red light with a wavelength of 650 nm to achieve the effect of producing a weak, non-glaring visible light.

[0029] On the other hand, the present application provides laser processing equipment that includes the laser focusing mechanism described above.

[0030] The technical features of the above-mentioned embodiments can be combined in any way. However, to simplify the description, not all possible combinations of the technical features in the above-mentioned embodiments are described. As long as there is no contradiction in the combination of these technical features, it should be assumed that it falls within the scope of this specification.

[0031] The above embodiments represent only preferred embodiments of the present application, and their descriptions are relatively specific and detailed; however, they should not be interpreted as limiting the scope of the present application. It should be noted that, for the average person skilled in the art, several modifications and improvements could be made without departing from the concept of the present application, and that all of these would fall within the scope of protection of the present application. Therefore, the scope of protection of the present application should be determined by the accompanying claims.

Claims

[1] Laser focusing mechanism, characterized by , that the laser focusing mechanism comprises a laser head, at least one visible laser generator and a lifting frame; wherein the visible laser generator is provided in the laser head, wherein the laser head and the visible laser generator emit at least two visible laser beams whose optical paths intersect, wherein the laser head is arranged on a lifting frame, wherein the lifting frame is configured to move the laser head along the Z-direction and to allow the light spots of the visible laser beams to overlap in order to achieve focusing. [2] Laser focusing mechanism according to claim 1, characterized by , that the generator for visible laser is provided at a preset angle on the laser head; whereby it can be seen at the beginning that the laser beams cross and overlap and thus form an initial focal point. [3] Laser focusing mechanism according to claim 2, characterized by that the preset angle is 65° to 75°. [4] Laser focusing mechanism according to claim 1, characterized by , that the laser head is configured to emit a first visible laser beam along the z-direction; wherein a single visible laser generator is provided, the visible laser beam emitted by the visible laser generator being a second visible laser beam; wherein the optical path of the second visible laser beam is inclined from the emitting end of the visible laser generator in the direction near the first visible laser beam. [5] Laser focusing mechanism according to claim 1, characterized by, that the laser head is configured to emit a first invisible laser beam along the z-direction; wherein two visible laser generators are provided, the visible laser generators being arranged opposite each other along the radial direction of the laser head and emitting a third visible laser beam and a fourth visible laser beam, the optical paths of the third visible laser beam and the fourth visible laser beam being inclined from the emitting end of the visible laser generator in the direction near the invisible laser beam. [6] Laser focusing mechanism according to claim 1, characterized by, that the laser focusing mechanism further comprises a processing table surface, wherein the processing table surface is configured to place the material to be processed, wherein the laser head and the emitting end of the visible laser generator are directed towards the processing table surface, wherein the laser head is driven by the lifting frame to move towards or away from the processing table surface along the Z-direction. [7] Laser focusing mechanism according to claim 6, characterized by , that the laser focusing mechanism further comprises a visual detection unit, wherein the visual detection unit is configured to detect the distribution of the light spots projected by the visible laser beam. [8] Laser focusing mechanism according to claim 7, characterized bythat the laser focusing mechanism also includes a control unit, wherein the control unit is electrically connected to the visual detection unit or the lifting frame, and wherein the control unit controls the lifting frame according to the detection result transmitted by the visual detection unit in order to adjust the position of the laser head. [9] Laser focusing mechanism according to claim 1, characterized by that the wavelength of the visible laser beam is between 380 nm and 780 nm. [10] Laser processing equipment, characterized by that the laser processing equipment comprises a laser focusing mechanism according to any one of claims 1 to 9.

Images