A laser soldering lens with variable focus parameter and circular spot

Abstract

The utility model relates to a kind of focusing parameter variable circular light spot laser soldering lens, including mirror body, mirror mouth structure, lifting seat and lifting drive structure, the mirror mouth structure can be lifted and set in mirror body below, mirror mouth structure includes mouth, fixed with engagement portion on mouth, the left and right sides of engagement portion are provided with inclined plane, lifting seat is set in mirror body bottom, lifting chamber is set in lifting seat, engagement portion is slidably connected in lifting chamber, lifting seat is provided with the contact component of mirror mouth structure elastic support, air hole is set in the left and right sides of lifting seat. The focusing parameter variable circular light spot laser soldering lens, gear and rack transmission are driven by driving part, so that contact block moves towards or away, the interaction of engagement surface and inclined plane is utilized, mirror mouth structure is promoted to lift, to change focal length, so it can be according to different substrate quickly adjust light spot size and energy density, optimize welding quality, realize the adjustment of focal length, improve welding adaptability.

Description

Technical Field

[0001] This utility model relates to the field of laser soldering lens technology, specifically a circular spot laser soldering lens with variable focusing parameters. Background Technology

[0002] A laser soldering lens is an optical lens assembly specifically designed for laser soldering processes. Its core task is to focus the raw laser beam emitted by the laser into a spot with high precision and accurately irradiate this spot onto the substrate, melting the solder (solder wire, solder paste, or solder ball) through thermal effects.

[0003] Laser soldering lenses are used in three modes: zero-focus, negative-focus, and positive-focus. At the zero-focus position, the laser spot is the smallest and the energy density reaches its peak. For laser soldering, a process that requires precise control of heat input, excessively high energy density can easily lead to problems such as solder splashing (the instantaneous and violent vaporization of solder paste or solder wire causes boiling and splashing, forming solder beads that contaminate surrounding components), PCB burn-out (easily burns sensitive PCB pads, especially thin copper layers or high-temperature sensitive substrates), or component damage (excessive thermal stress concentration may damage heat-sensitive components). Therefore, the operation of zero-focus, negative-focus, and positive-focus lenses depends on the specific application scenario and material characteristics. Thus, a laser soldering lens with adjustable focusing parameters is designed. To this end, a circular spot laser soldering lens with variable focusing parameters is proposed. Utility Model Content

[0004] Based on the above description, this utility model provides a circular spot laser soldering lens with variable focusing parameters, which solves the technical problems pointed out in the background art.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a circular spot laser soldering lens with variable focusing parameters, comprising: mirror body; The lens mouth structure is height-adjustable and located below the lens body, and includes a mouth part. A fitting part is fixed on the mouth part, and bevels are provided on the left and right sides of the fitting part. The lifting seat is located at the bottom of the mirror body. The lifting seat has a lifting chamber. The fitting part is slidably connected in the lifting chamber. The lifting seat is equipped with a contacting component that provides elastic support for the mirror nozzle structure. Holes are opened on both the left and right sides of the lifting seat. The lifting drive structure includes an outer frame fixed to the outside of the lifting seat, a contact block slidably connected in the hole, the contact block having a mating surface that mats with the inclined surface, a drive part provided at the bottom of the outer frame, a gear mounted on the drive end of the drive part, two sets of opposing racks meshing on the outside of the gear, and the racks being fixedly connected to the contact block through a connecting strip.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the mating part is provided with a sliding hole, and the abutting component includes a sliding rod, which is fixed between the inner top wall and the inner bottom wall of the lifting chamber. The mating part is slidably connected to the sliding rod through the sliding hole, and a spring fixed between the mating part and the inner top wall of the lifting seat is sleeved on the outside of the sliding rod.

[0008] Furthermore, the number of springs is the same as the number of sliding rods, and there are four sets of sliding rods, which are symmetrically distributed in pairs on the left and right sides.

[0009] Furthermore, the outer frame consists of a base plate and a frame plate fixed to the base plate, and a top cover is fixed to the outer frame by bolts.

[0010] Furthermore, the inclined surface and the mating surface are coated with a wear-resistant coating.

[0011] Furthermore, the maximum width and maximum length of the mating part are equal to the width and length of the lifting chamber, respectively, and the mating part is smaller than the height of the lifting chamber.

[0012] Furthermore, the height of the mating surface is less than the height of the inclined plane.

[0013] Furthermore, the outer side of the lens body is provided with six mounting ports, which are distributed from top to bottom. The lens body is equipped with two upper protective lenses, a collimating lens, a focusing lens, a middle protective lens, and a lower protective lens, which are distributed from top to bottom, through the mounting ports.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: This circular spot laser soldering lens with variable focusing parameters drives gears and racks via a drive unit, causing the contact blocks to move towards or away from each other. By utilizing the interaction between the mating surface and the inclined surface, the lens nozzle structure is raised and lowered, thereby changing the focal length. In this way, the spot size and energy density can be quickly adjusted according to different substrates, optimizing the soldering quality, achieving adjustable focal length, and improving soldering adaptability. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a circular spot laser soldering lens with variable focusing parameters provided for an embodiment of this utility model; Figure 2 for Figure 1 A structural diagram of the middle lifting seat and its connecting structure; Figure 3 for Figure 2 A schematic diagram of a half-section structure; Figure 4 This is a schematic diagram of the fitting part and its connecting structure in an embodiment of this utility model; Figure 5This is a schematic diagram showing the relationship between the lens nozzle structure and the focal point in an embodiment of this utility model.

[0016] The attached diagram lists the components represented by each number as follows: 1. Lens housing; 11. Upper protective lens; 12. Collimating lens; 13. Focusing lens; 14. Middle protective lens; 15. Lower protective lens; 2. Lens nozzle structure; 21. Nozzle; 22. Mating part; 221. Angled surface; 3. Lifting base; 31. Lifting chamber; 32. Slide rod; 33. Spring; 4. Lifting drive structure; 41. Outer frame; 42. Contact block; 421. Mating surface; 43. Drive part; 44. Gear; 45. Rack; 46. Connecting bar. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0018] like Figure 1-5 As shown, a circular spot laser soldering lens with variable focusing parameters in this embodiment includes a lens body 1. Six mounting ports are provided on the outer side of the lens body 1, which are distributed from top to bottom. The lens body 1 is equipped with two upper protective lenses 11, a collimating lens 12, a focusing lens 13, a middle protective lens 14, and a lower protective lens 15, which are distributed from top to bottom through the mounting ports. This is the prior art and will not be described in detail here.

[0019] In addition, in this embodiment, the circular spot laser soldering lens with variable focusing parameters also includes a lens nozzle structure 2, a lifting seat 3, and a lifting drive structure 4. Specifically, a lens nozzle structure 2 is provided below the lens body 1 and can be lifted and lowered. The lens nozzle structure 2 includes a mouth part 21, and a fitting part 22 is fixed on the mouth part 21. Inclined surfaces 221 are provided on the left and right sides of the fitting part 22. The inclined surfaces 221 make the fitting part 22 wider at the top and narrower at the bottom, so as to provide technical support for subsequent lifting and lowering. The fitting part 22 is hollow.

[0020] Therefore, a lifting seat 3 is connected and fixedly installed at the bottom of the lens body 1. The lifting seat 3 has a lifting chamber 31 for the mating part 22 to move up and down in the lifting chamber 31. It should be noted that the lifting seat 3 is provided with a contacting component that provides elastic support for the lens nozzle structure 2. Specifically, the mating part 22 has a sliding hole. The contacting component includes a sliding rod 32 fixed between the inner top wall and the inner bottom wall of the lifting chamber 31. The mating part 22 is slidably connected to the sliding rod 32 through the sliding hole. A spring 33 is sleeved on the outside of the sliding rod 32 and fixed between the mating part 22 and the inner top wall of the lifting seat 3. The design of the spring 33 must ensure that its working compression stroke is always within its safe working range. Specifically, the compression amount of the spring 33 when the lens nozzle structure 2 is in the highest position should be less than its maximum compression amount to ensure that it works within the elastic deformation range and avoids plastic deformation or a sudden drop in fatigue life.

[0021] It should be noted that the maximum width and maximum length of the mating part 22 are equal to the width and length of the lifting chamber 31, respectively. The mating part 22 is smaller than the height of the lifting chamber 31. Holes are provided on the left and right sides of the lifting seat 3 to meet the design requirements of the lifting drive structure 4. In addition, to ensure lifting balance, there are four sets of slide rods 32, which are symmetrically distributed in pairs on the left and right. Therefore, there are also four sets of springs 33.

[0022] The lifting drive structure 4 includes an outer frame 41 fixed to the outside of the lifting seat 3, and a contact block 42 slidably connected in the hole. The contact block 42 has a mating surface 421 that mats with the inclined surface 221, but the height of the mating surface 421 is less than the height of the inclined surface 221 to meet the lifting requirements. A drive unit 43 is fixedly installed at the bottom of the outer frame 41 by bolts. The drive unit 43 is a micro motor equipped with a worm gear reducer. A gear 44 is installed at the drive end of the drive unit 43. Two sets of opposing racks 45 are meshed on the outside of the gear 44 to form a meshing transmission relationship. When the gear 44 is driven by the drive unit 43 to rotate, the two sets of racks 45 can move towards or away from each other. Therefore, the racks 45 are fixedly connected to the contact block 42 by a connecting strip 46, so that the connecting strip 46 can drive the two sets of contact blocks 42 to move towards or away from each other.

[0023] It should be noted that the outer frame 41 consists of a base plate and a frame plate fixed to the base plate. A top cover is fixed to the outer frame 41 by bolts to hide the gear 44 and rack 45. In addition, it is understood that the surfaces of the inclined surface 221 and the mating surface 421 can be coated with a wear-resistant coating. The wear-resistant coating is one of diamond-like carbon coating, chromium nitride coating, hard anodized coating or chemical nickel-phosphorus alloy coating. By applying the above coating, the sliding friction coefficient can be effectively reduced, wear can be reduced, and the long-term accuracy and reliability of focus adjustment can be ensured.

[0024] With this design, when the drive unit 43 starts and drives the gear 44 to rotate, the two sets of contact blocks 42 move towards each other and approach each other through the transmission of the rack 45 and the connecting bar 46. At this time, the lens nozzle structure 2 rises as a whole. In this way, the focal length can be changed, that is, the focusing parameters can be changed. When dealing with different substrates, the focal length can be controlled according to the situation. The adjustment of the light spot can be known by observing the size of the light spot.

[0025] The operation of this circular spot laser soldering lens with variable focusing parameters is described below: Mechanical transmission principle: The drive unit 43 serves as the power source, converting rotational motion into linear motion through gears 44 and racks 45. When gear 44 rotates, the two sets of racks 45 move simultaneously towards or away from each other, causing the contact block 42 to slide horizontally. The mating surface 421 of the contact block 42 and the inclined surface 221 of the mating part 22 form a wedge fit. When the contact block 42 moves horizontally, the interaction between the inclined surface 221 and the mating surface 421 converts the horizontal force into a vertical force, pushing the lens tip structure 2 up and down along the slide rod 32. The slide rod 32 and the spring 33 provide guidance and elastic reset. The slide rod 32 ensures that the vertical movement of the lens tip structure 2 does not deviate, and the spring 33 helps the lens tip structure 2 reset and remain stable when the drive is released.

[0026] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A circular spot laser soldering lens with variable focusing parameters, characterized in that, include: Mirror body (1); The lens mouth structure (2) is raised and lowered and is located below the lens body (1), and includes a mouth part (21). A fitting part (22) is fixed on the mouth part (21), and inclined surfaces (221) are provided on the left and right sides of the fitting part (22). The lifting seat (3) is located at the bottom of the mirror body (1). A lifting chamber (31) is provided in the lifting seat (3). The fitting part (22) is slidably connected in the lifting chamber (31). The lifting seat (3) is provided with a contacting component that elastically supports the mirror nozzle structure (2). Holes are provided on both the left and right sides of the lifting seat (3). The lifting drive structure (4) includes an outer frame (41) fixed to the outside of the lifting seat (3), a contact block (42) slidably connected in the hole, the contact block (42) has a mating surface (421), the mating surface (421) is mated with the inclined surface (221), a drive part (43) is provided at the bottom of the outer frame (41), a gear (44) is assembled at the drive end of the drive part (43), two sets of opposite racks (45) are meshed on the outside of the gear (44), and the racks (45) are fixedly connected to the contact block (42) through a connecting strip (46).

2. The circular spot laser soldering lens with variable focusing parameters according to claim 1, characterized in that: The fitting part (22) is provided with a sliding hole, and the abutting component includes a sliding rod (32). The sliding rod (32) is fixed between the inner top wall and the inner bottom wall of the lifting chamber (31). The fitting part (22) is slidably connected to the sliding rod (32) through the sliding hole. A spring (33) is sleeved on the outside of the sliding rod (32) and fixed between the fitting part (22) and the inner top wall of the lifting seat (3).

3. The circular spot laser soldering lens with variable focusing parameters according to claim 2, characterized in that: The number of springs (33) is the same as the number of slide rods (32). There are four sets of slide rods (32), and the four sets of slide rods (32) are symmetrically distributed in pairs on the left and right.

4. A circular spot laser soldering lens with variable focusing parameters according to claim 3, characterized in that: The outer frame (41) consists of a base plate and a plate frame fixed on the base plate, and a top cover is fixed to the outer frame (41) by bolts.

5. A circular spot laser soldering lens with variable focusing parameters according to claim 4, characterized in that: The inclined surface (221) and the mating surface (421) are coated with a wear-resistant coating.

6. A circular spot laser soldering lens with variable focusing parameters according to claim 5, characterized in that: The maximum width and maximum length of the fitting part (22) are equal to the width and length of the lifting chamber (31), respectively, and the fitting part (22) is smaller than the height of the lifting chamber (31).

7. A circular spot laser soldering lens with variable focusing parameters according to claim 6, characterized in that: The height of the mating surface (421) is less than the height of the inclined surface (221).

8. A circular spot laser soldering lens with variable focusing parameters according to claim 1, characterized in that: The outer side of the lens body (1) is provided with six mounting ports, which are distributed from top to bottom. The lens body (1) is equipped with two upper protective lenses (11), a collimating lens (12), a focusing lens (13), a middle protective lens (14), and a lower protective lens (15) distributed from top to bottom through the mounting ports.

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