A ring laser soldering lens with continuously adjustable spot diameter

Abstract

The utility model relates to a kind of annular laser soldering lens with continuously adjustable light spot diameter, including shell, adjusting cavity is opened in the shell interior, the adjusting cavity includes central groove and the side groove located at the both sides of central groove;The laser lens that can slide up and down is arranged in the central groove, adjusting block is arranged in the both sides of laser lens, the adjusting block is housed in the side groove;Focal length adjusting knob is arranged on the top of shell, the adjusting rod connected with adjusting block is connected with the focal length adjusting knob, adjusting aperture is arranged on the upper portion of central groove, aperture adjusting knob is arranged on the top of shell, the adjusting gear for adjusting adjusting aperture is connected with the bottom of aperture adjusting knob.The utility model drives adjusting gear by aperture adjusting knob, drives adjusting plate to rotate, and then make multiple adjusting piece synchronous sliding, the size of light aperture can be infinitely variable, the continuous adjustment of light spot diameter is realized.

Description

Technical Field

[0001] This utility model relates to laser welding lenses, specifically to a ring-shaped laser soldering lens with continuously adjustable spot diameter. Background Technology

[0002] Laser soldering technology, as one of the key processes in modern precision electronics manufacturing, is widely used in microelectronic packaging, PCB component soldering, and sensor assembly due to its advantages such as small heat-affected zone, high precision, and non-contact operation. In laser soldering, a laser beam is focused by an optical lens to form a spot that acts on the solder. The shape, size, and energy distribution of this spot directly affect the soldering quality and effect. In particular, the annular spot, with its center being free of light, helps preheat the solder pads and prevents overheating at the center point, making it more suitable for certain heat-sensitive precision soldering applications.

[0003] Currently, some laser soldering lenses on the market have numerous limitations in their spot adjustment capabilities. Traditional adjustment methods often rely on replacing fixed apertures or lens groups of different specifications to change the spot size. This method is not only cumbersome and time-consuming, unable to achieve continuous stepless adjustment, but also makes it difficult to ensure precise centering of the spot after replacement, affecting processing consistency. Furthermore, flux fumes and metal spatter generated during soldering easily adhere to the surface of optical components inside the lens, leading to laser energy attenuation, decreased spot quality, and even permanent damage to the lenses. Existing lenses often have insufficient sealing and protective designs; cleaning and maintaining internal optical components typically requires complex disassembly by professionals, resulting in high maintenance costs and reduced production efficiency.

[0004] On the other hand, some lenses with adjustment functions may have interconnected focusing and bokeh mechanisms, leading to coupling interference during adjustment. This makes it difficult to independently and accurately control the bokeh size and focus position, limiting the optimization of the process window. Furthermore, the lack of intuitive adjustment indicators makes operation reliant on experience, hindering the precise reproduction of process parameters. Utility Model Content

[0005] Based on the above description, this utility model provides a ring laser soldering lens with continuously adjustable spot diameter to solve the problem of inconvenience in adjusting the spot size and shape of existing laser lenses.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A ring laser soldering lens with continuously adjustable spot diameter includes a housing, an adjustment cavity is provided inside the housing, the adjustment cavity includes a central groove and side grooves located on both sides of the central groove; a laser lens that can slide up and down is provided in the central groove, and adjustment blocks are provided on both sides of the laser lens, the adjustment blocks being accommodated in the side grooves; a focal length adjustment knob is provided at the top of the housing, the focal length adjustment knob is connected to an adjustment rod connected to the adjustment block, an adjustment aperture is provided at the upper part of the central groove, an aperture adjustment knob is provided at the top of the housing, and an adjustment gear for adjusting the aperture is connected to the bottom of the aperture adjustment knob; a protective cylinder is connected to the lower part of the housing, and an air inlet pipe is provided on the side wall of the protective cylinder; the housing is provided with a receiving groove, and a pull-out lens protector is provided in the receiving groove.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the adjusting rod is a screw, and one of the adjusting blocks is provided with a screw hole that mates with the adjusting rod.

[0009] Furthermore, another of the adjustment blocks is provided with a sliding hole, and a sliding rod passing through the sliding hole is provided in one of the side grooves.

[0010] Furthermore, the adjusting aperture includes a fixing plate fixed to the top of the central groove, and the bottom of the fixing plate has a plurality of adjusting grooves arranged in a circumferential array. It also includes multiple adjusting plates, the top of which is slidably connected to the adjusting groove via a sliding block, and the bottom of which is connected to the sliding groove of the adjusting plate via a sliding column; the adjusting plate is provided with toothed grooves on its outer periphery, and the adjusting gear meshes with the toothed grooves.

[0011] Furthermore, the outer wall of the top of the housing is respectively provided with a scale with the focus adjustment knob as the center and the aperture adjustment knob as the center.

[0012] Furthermore, a limiting block is provided at the bottom of the sliding column, and the diameter of the limiting block is greater than the width of the sliding groove.

[0013] Furthermore, when the adjusting plate rotates, it drives each adjusting piece to slide synchronously through the sliding column.

[0014] Furthermore, the lens protector includes a drawer frame and a protective lens disposed within the drawer frame, wherein the drawer frame and the receiving groove form a sliding fit structure.

[0015] Furthermore, the internal cavity of the protective cylinder is shaped like an inverted frustum, and the axis of the internal cavity of the protective cylinder coincides with the axis of the central groove.

[0016] Furthermore, the adjusting plate is fan-shaped and arranged in a circumferential array around the inner hole of the fixing plate.

[0017] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. This utility model uses an aperture adjustment torque to drive an adjustment gear, which in turn drives the adjustment plate to rotate, thereby causing multiple adjustment plates to slide synchronously. This allows for stepless adjustment of the light aperture size, achieving continuous adjustment of the light spot diameter and avoiding the discontinuity and inconvenience of traditional lens replacement methods.

[0018] 2. The present invention uses two independent mechanisms to change the height of the laser lens via the adjusting rod and to adjust the aperture, which do not interfere with each other. Users can make precise adjustments according to the welding process requirements, which is highly flexible.

[0019] 3. This utility model provides an intuitive visual reference for adjusting the focal length and aperture through the scale set on the top of the housing, which facilitates quantitative and repeatable precise control and ensures the consistency and stability of the welding process.

[0020] 4. In this utility model, the inverted frustum-shaped protective cylinder and the air inlet pipe form a laminar flow nitrogen curtain, and the welding fumes are suppressed below the outlet of the protective cylinder. Attached Figure Description

[0021] Figure 1 A schematic diagram of a ring laser soldering lens with continuously adjustable spot diameter provided for an embodiment of this utility model; Figure 2 A cross-sectional schematic diagram of an annular laser soldering lens with continuously adjustable spot diameter provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the laser lens in an embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-section of the shell in an embodiment of this utility model; Figure 5 This is a schematic diagram of adjusting the aperture in an embodiment of this utility model; Figure 6 This is a three-dimensional view of the fixing plate from below in an embodiment of this utility model; Figure 7 This is a schematic diagram showing the distribution relationship between the adjusting plate and the adjusting piece in an embodiment of this utility model; Figure 8 This is a schematic diagram of the aperture adjustment knob in an embodiment of the present invention; Figure 9 This is a schematic diagram of the focus adjustment knob in an embodiment of the present invention.

[0022] The attached diagram lists the components represented by each number as follows: 1. Housing; 11. Receiving slot; 2. Protective cylinder; 3. Adjustment cavity; 4. Laser lens; 41. Adjustment block; 5. Air inlet pipe; 6. Lens protector; 61. Drawer frame; 62. Protective lens; 7. Adjusting aperture; 71. Fixing plate; 72. Adjusting groove; 73. Connecting cylinder; 74. Adjusting plate; 75. Sliding groove; 76. Adjusting plate; 77. Sliding block; 78. Sliding column; 8. Aperture adjustment knob; 81. Adjustment gear; 9. Focus adjustment knob; 91. Adjustment lever. Detailed Implementation

[0023] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] Please see Figure 1-9 A ring-shaped laser soldering lens with continuously adjustable spot diameter is described. The lens has a shell 1 as its frame and an internal one-piece molded adjustment cavity 3. The adjustment cavity 3 consists of a central groove running through the top and bottom and two symmetrically arranged side grooves: the side grooves provide guidance for the moving parts, and the central groove provides an unobstructed passage for the optical path. The structure is compact and improves space utilization.

[0026] A laser lens 4 is installed in the central groove, and an adjustment block 41 extends integrally from both sides of the lens. The adjustment block 41 is precisely embedded in the corresponding side groove, forming a combination of slider and guide rail. This not only limits the laser lens 4 to move up and down, but also prevents it from rotating around the optical axis, ensuring that the light spot is always coaxial with the nozzle.

[0027] One adjustment block 41 has a screw hole machined on one side, which meshes with the screw section of the adjustment rod 91; the other adjustment block 41 has a smooth sliding hole, which cooperates with the sliding rod fixed in the side groove. When the focus adjustment knob 9 on the top of the rotating housing 1 is rotated, the screw-screw hole will convert the rotation into the linear displacement of the laser lens 4. The sliding rod and the sliding hole are guided synchronously, and there is no lateral clearance during the adjustment process, which greatly improves the repeatability accuracy of the spot focus position.

[0028] An adjusting aperture 7 is fixed at the top of the central slot. The adjusting aperture 7 uses a circular fixed plate 71 as its base, with a docking cylinder 73 at its top for docking the optical path. Its bottom surface is evenly distributed with several radial adjusting grooves 72. It also includes multiple fan-shaped adjusting plates 76, each with a sliding block 77 at its top. Each sliding block 77 on each adjusting plate 76 is embedded in a different adjusting groove 72, allowing the adjusting plate 76 to slide smoothly radially. A sliding post 78 is located at the bottom of each adjusting plate 76. The sliding post 78 passes through a sliding groove 75 on the adjusting plate 74 and is locked at its end with a limiting block, preventing it from falling off and simultaneously converting the rotational movement of the adjusting plate 74 into the radial opening and closing of all the adjusting plates 76. Because all the adjusting plates 76 are linked, the aperture is kept as close to a true circle as possible, avoiding uneven energy distribution caused by asynchronous operation of multiple plates.

[0029] In this embodiment, a full circle of toothed grooves is machined on the outer periphery of the adjustment plate 74, which directly meshes with the adjustment gear 81 at the bottom of the aperture adjustment knob 8. A slight rotation of the aperture adjustment knob 8 with a finger allows for stepless adjustment of the light aperture diameter, enabling continuous variation of the light spot diameter and meeting the need for rapid switching between large solder pads and small solder points on the same workpiece. Two rings of scale are engraved around the two adjustment knobs on the top of the housing 1, allowing the operator to quantitatively reset or record process parameters without the need for external measuring instruments, significantly reducing line changeover and debugging time.

[0030] In this embodiment, a receiving groove 11 is formed below the laser lens 4 on the side wall of the central groove, and a drawer-type lens protector 6 is inserted inside it. The lens protector 6 consists of a drawer frame 61 and a protective lens 62. The protective lens 62 is perpendicular to the optical axis and can intercept flux fumes and splattered solder balls in the first place. The drawer frame 61 and the receiving groove 11 are fitted with a gap, so that it can be positioned by insertion and replaced by removal, which greatly reduces maintenance time and the production line does not need to be stopped.

[0031] Finally, a protective cylinder 2 is connected to the lower end of the housing 1. Its inner cavity is an inverted frustum shape, wider at the top and narrower at the bottom, with its axis strictly coaxial with the central groove. The side wall of the protective cylinder 2 is tangentially connected to the air inlet pipe 5. Nitrogen gas is continuously introduced during welding, and the airflow forms a laminar air curtain in the inverted frustum cavity. This not only pushes the fumes and dust below the weld point but also forms a positive pressure barrier on the side of the optical element, which greatly reduces the surface contamination rate of the laser lens 4, thereby increasing the continuous production time.

[0032] The workflow of the above embodiments: According to the welding process requirements, the operator rotates the aperture adjustment knob 8, which drives the toothed adjustment plate 74 to rotate through the adjustment gear 81 at its bottom. The rotation of the adjustment plate 74 is converted into the synchronous, centripetal or centrifugal sliding of all the adjustment plates 76 through the cooperation of the sliding column 78 and the sliding groove 75, thereby continuously and precisely changing the central light transmission aperture. The operator can use the scale groove around the aperture adjustment knob 8 to quantitatively set the required spot diameter, thereby achieving stepless, continuous and symmetrical adjustment of the spot diameter, ensuring the uniformity of laser energy distribution to adapt to different sized welding pads. Then, the operator rotates the focus adjustment knob 9, which drives the connected adjustment rod 91 to rotate. By engaging with the screw hole on an adjustment block 41 and using the guiding action of the slide rod on the other side, the rotational motion is converted into the precise up-and-down linear motion of the laser lens 4, thereby changing the focusing position of the laser. The scale on the top of the housing 1 provides a precise visual reference for focus adjustment, thereby achieving independent and precise calibration of the focus, ensuring that the laser energy can be accurately focused on the surface of the workpiece to obtain the best welding effect. Before or simultaneously with laser welding, inert gases such as nitrogen are introduced into the lens through the air inlet pipe 5 on the side wall of the protective cylinder 2. Since the internal cavity of the protective cylinder 2 is shaped like an inverted frustum, the airflow can better form a positive pressure environment covering the beam path, thereby effectively blowing away and isolating the flux fumes and metal spatter generated during welding, preventing them from contaminating the optical components above. Secondly, the welding pool area is protected by gas to reduce oxidation and improve welding quality.

[0033] In this process, the lens protector 6 located below the laser lens 4 plays a crucial role. Its internal protective lens 62 acts as the first physical barrier, directly blocking small amounts of contaminants that might breach the air curtain; When the protective lens 62 needs to be cleaned or replaced due to long-term use, it is not necessary to disassemble the entire lens. The operator can simply pull out the drawer frame 61 of the lens protector 6 to remove it from the receiving slot 11 of the housing 1. After maintenance is completed, the cleaned or replaced protective lens 62 can be pushed back into the receiving groove 11 to reset it; then, according to the needs of the next welding task, the parameter preset of the first stage can be re-executed to start a new work cycle.

[0034] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A ring-shaped laser soldering lens with continuously adjustable spot diameter, comprising a housing (1), wherein an adjustment cavity (3) is provided inside the housing (1), characterized in that: The adjustment cavity (3) includes a central groove and side grooves located on both sides of the central groove; a laser lens (4) that can slide up and down is provided in the central groove, and adjustment blocks (41) are provided on both sides of the laser lens (4), and the adjustment blocks (41) are housed in the side grooves; a focal length adjustment knob (9) is provided on the top of the housing (1), and the focal length adjustment knob (9) is connected to an adjustment rod (91) connected to the adjustment block (41); an adjustment aperture (7) is provided on the upper part of the central groove, and an aperture adjustment knob (8) is provided on the top of the housing (1), and an adjustment gear (81) for adjusting the aperture (7) is connected to the bottom of the aperture adjustment knob (8); a protective cylinder (2) is connected to the lower part of the housing (1), and an air inlet pipe (5) is provided on the side wall of the protective cylinder (2); a receiving groove (11) is provided in the housing (1), and a pull-out lens protector (6) is provided in the receiving groove (11).

2. The ring laser soldering lens with continuously adjustable spot diameter according to claim 1, characterized in that: The adjusting rod (91) is a screw, and one of the adjusting blocks (41) is provided with a screw hole that cooperates with the adjusting rod (91).

3. The ring laser soldering lens with continuously adjustable spot diameter according to claim 1, characterized in that: Another adjustment block (41) is provided with a sliding hole, and a sliding rod passing through the sliding hole is provided in one of the side grooves.

4. The ring laser soldering lens with continuously adjustable spot diameter according to claim 1, characterized in that: The adjustment aperture (7) includes a fixing plate (71) fixed to the top of the center groove, and the bottom of the fixing plate (71) has a plurality of adjustment grooves (72) arranged in a circumferential array. It also includes multiple adjusting plates (76), the top of the adjusting plate (76) is slidably connected to the adjusting groove (72) via a sliding block (77), and the bottom of the adjusting plate (76) is connected to the sliding groove (75) of the adjusting plate (74) via a sliding column (78); the outer periphery of the adjusting plate (74) is provided with toothed grooves, and the adjusting gear (81) meshes with the toothed grooves.

5. The ring laser soldering lens with continuously adjustable spot diameter according to claim 1, characterized in that: The outer top wall of the housing (1) is provided with a scale with the focal length adjustment knob (9) as the center and the aperture adjustment knob (8) as the center.

6. The ring laser soldering lens with continuously adjustable spot diameter according to claim 4, characterized in that: The bottom of the sliding column (78) is provided with a limiting block, the diameter of which is greater than the width of the sliding groove (75).

7. The ring laser soldering lens with continuously adjustable spot diameter according to claim 4, characterized in that: When the adjusting plate (74) rotates, it drives each adjusting piece (76) to slide synchronously through the sliding column (78).

8. The ring laser soldering lens with continuously adjustable spot diameter according to claim 1, characterized in that: The lens protector (6) includes a drawer frame (61) and a protective lens (62) disposed in the drawer frame (61). The drawer frame (61) and the receiving groove (11) form a sliding fit structure.

9. The ring laser soldering lens with continuously adjustable spot diameter according to claim 1, characterized in that: The internal cavity of the protective cylinder (2) is shaped like an inverted frustum, and the axis of the internal cavity of the protective cylinder (2) coincides with the axis of the central groove.

10. The ring laser soldering lens with continuously adjustable spot diameter according to claim 4, characterized in that: The adjusting plate (76) is fan-shaped and arranged in a circumferential array around the inner hole of the fixing plate (71).

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