A laser marking device

Abstract

The application relates to a laser marking device and belongs to the technical field of laser direct writing photoetching, which solves the problems of fiber jumper wire breakage, very troublesome disassembly and assembly and poor PCB board adsorption effect in the prior art. The application is a laser marking device which comprises a base and a light source emitter, a light source plug core is further arranged on the base, one end of the light source plug core is connected with the light source emitter, the other end is provided with a lens for adjusting light, and an exit light diaphragm for limiting the light beam aperture is further arranged on the base; the light emitted by the light source emitter sequentially passes through the light source plug core, the lens and the exit light diaphragm. The original light source head and the marking head are combined, the structure of the fiber as the jumper wire is cancelled, the other end of the light source plug core is directly provided with the lens after being connected with the light source emitter, the light passing through the light source plug core can be immediately processed through the lens, has the required properties and is finally emitted through the exit light diaphragm.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of laser direct writing lithography, and particularly relates to a laser marking device. BACKGROUND

[0002] With the improvement of the integration of integrated circuits and the progress of mounting technology, the manufacturing requirements of PCB boards are also getting higher and higher. The manufacturing process of PCB boards is complex, and one of the processes is to transfer the designed circuit layout to the PCB board to form a PCB circuit diagram, which is an exposure technology, and the main equipment used is an exposure machine. Generally, the PCB board adopts a multi-layer structure and needs to be exposed multiple times, and accurate positioning is required before each exposure, so a marking positioning device is needed. Whether the marking points are clear, reliable and stable will directly affect the manufacturing accuracy and efficiency of the PCB board. At present, the main marking methods include code marking, mechanical marking and laser marking. Code marking has low precision, mechanical marking has problems such as wear, and laser marking is a non-contact marking method with high precision, high efficiency and simple operation, and is widely used. At present, in the marking system of the PCB board exposure equipment, visual recognition positioning technology is mostly used, and the core is to clearly highlight the "marking points" that need to be positioned. This requires that the edges of the marking points are clear and the patterns are regular.

[0003] The patent for invention with publication number CN111889891A discloses a marking positioning device and an exposure machine. The light source head and the marking head of the marker are connected through an optical fiber jumper, and the two ends of the jumper are ceramic ferrules. This structure is prone to breakage of the optical fiber jumper during installation and use. Moreover, the installation of the marking head is from top to bottom into the threaded hole of the suction cup, and the suction cup cover plate needs to be removed before the marking head is installed and disassembled, so the installation and disassembly are very troublesome, and the maintenance and replacement are difficult in the later period. Moreover, the suction cup cover is easily removed multiple times, which leads to poor suction effect of the suction cup on the PCB board, and the PCB board and the control platform cannot be guaranteed to be flat, which may have a certain gap and affect the marking positioning accuracy.

[0004] Therefore, a structure can be designed to integrate the light source head and the marking head without increasing the volume, cancel the optical fiber jumper, and avoid the above-mentioned defects caused by the jumper. SUMMARY

[0005] The purpose of the present application is to solve the above-mentioned problems of the existing technology, and to provide a one-piece marking device with a built-in light source ferrule that cancels the optical fiber jumper.

[0006] In order to achieve the purpose of the present application, the following technical solutions can be used: a laser marking device, comprising a base and a light source emitter, the base is further provided with a light source plug-in core, one end of the light source plug-in core is connected with the light source emitter, and the other end is provided with a lens for adjusting light, the base is further provided with an out-light diaphragm for limiting the aperture of the light beam; the light emitted by the light source emitter passes through the light source plug-in core, the lens and the out-light diaphragm in sequence.

[0007] After combining the original light source head and the marking head, the structure of the optical fiber as a jumper is cancelled, the light source plug-in core is connected with the light source emitter, and the other end is directly provided with a lens, the light passing through the light source plug-in core can be immediately processed through the lens, and then the light with the required properties is emitted through the out-light diaphragm.

[0008] In the above-mentioned laser marking device, the out-light diaphragm can be sleeved into a suction cup, and the out-light diaphragm is provided with a first air hole. The suction cup is used for adsorbing the PCB board, and the purpose is to prevent too large gap between the PCB board and the upper surface of the out-light diaphragm, causing the light spot to be out of focus, so that the edge of the light spot is blurred, and the identification degree of the mark is affected. Different from the past, the first air hole is arranged on the out-light diaphragm, which effectively avoids the gap between the suction cup and the PCB board which is irregularly warped, and also effectively avoids the uneven shape of the negative pressure cavity formed by the suction cup after the suction cup is disassembled for many times, resulting in irregular adhesion of the PCB board to the suction cup, and finally resulting in that the out-light diaphragm sleeved into the suction cup cannot be completely adhered to the PCB board. Therefore, the first air hole is directly arranged on the out-light diaphragm, and the out-light diaphragm is directly adhered to the PCB board under the action of external negative pressure.

[0009] In the above-mentioned laser marking device, the base is further provided with a diaphragm fixing seat for mounting the out-light diaphragm, the out-light diaphragm is provided with an out-light hole for emitting light, and the side of the diaphragm fixing seat is further provided with a second air hole, and the out-light hole and the second air hole are communicated. The second air hole is communicated with the out-light hole, which can assist the first air hole in forming a negative pressure between the suction cup and the PCB board, and has the same effect as the first air hole, and plays a role of adsorption. On the other hand, it can also remove the dust on the upper surface of the lens, and the airflow formed in the diaphragm fixing seat can clean the dust and other impurities on the surface of the lens close to the diaphragm fixing seat.

[0010] In the above-mentioned laser marking device, the lens comprises a light uniformizing sheet. After the structure of the optical fiber as a jumper is cancelled, the optical fiber is lacking as a light uniformizing function, so a light uniformizing sheet needs to be added to achieve the effect of light uniformization.

[0011] In the above-mentioned laser marking device, the light uniformizing sheet is made of transparent material, one side of the light uniformizing sheet is a frosted surface, and the other side is a polished surface.

[0012] In the above laser marking device, the base further comprises a light source fixing seat and a flange, the flange is provided with a screw hole, and the outer circle of the light source fixing seat is provided with an external thread. The light source fixing seat is used for fixing the light source emitter, and fixing the light source emitter basically plays a role of fixing the whole laser marking device. The light source fixing seat is located at the center of the flange, and the external thread can make the light source fixing seat be screwed into the suction cup. In combination with the screw hole, the light source fixing seat can be fixed with the suction cup, so that the base is installed in the suction cup.

[0013] The suction cup comprises a suction cup body and a suction cup cover plate. The suction cup body is used for connecting with the bottom of the base, and the suction cup cover plate is used for connecting with the light exit diaphragm on the top of the bottom disc. The upper surface of the suction cup cover plate is flush with the upper surface of the light exit diaphragm. In the original split type technology, a stop block for fixing the marking head needs to be arranged between the suction cup body and the suction cup cover plate, so that the installation and disassembly are troublesome. In the integrated application structure, the stop block is cancelled for fixing the light exit diaphragm and the light source fixing seat, and the light diaphragm fixing seat is directly installed on the base, so that the structure of the base installed on the bottom disc body and the light exit diaphragm installed on the bottom disc cover plate is simple.

[0014] In the above laser marking device, the base is further provided with a light source compression nut for fixing the light source emitter, and the light source compression nut comprises a flat wire and a through hole. The flat wire and the through hole can facilitate the hand screwing of the light source compression nut, and can also be screwed by using a nut wrench and an internal hexagonal wrench or a metal rod. Moreover, the light source compression nut is further slotted on the side to facilitate threading.

[0015] In the above laser marking device, the light exit diaphragm is of transparent material, the upper surface of the light exit diaphragm is provided with a black plating layer, and a transparent light exit hole is left in the middle of the black plating layer.

[0016] In the above laser marking device, the light exit diaphragm is of non-transparent material, and a light exit hole is arranged in the middle of the light exit diaphragm.

[0017] In the above laser marking device, the light exit diaphragm and the light diaphragm fixing seat are connected by glue, and a plurality of glue dispensing holes are further arranged on the light diaphragm fixing seat.

[0018] In the above laser marking device, the lens further comprises a collimating mirror, and the collimating mirror is arranged on the side of the light homogenizing sheet away from the light source emitter. The collimating mirror continues to play a role of collimating the optical fiber under the light homogenizing of the light homogenizing sheet.

[0019] In the above laser marking device, the light source plug-in core is internally provided with an optical fiber, one end of the optical fiber is a sintered small ball, and the other end is a ground flat surface. The purpose of the sintered small ball is to improve the propagation efficiency of light and reduce the loss.

[0020] Compared with the prior art, the structure has the following advantages:

[0021] (1) The original split type is changed into an integrated type without increasing the volume, the fiber jumper structure which is easy to damage is cancelled, and the service life and practicability of the device are increased;

[0022] (2) The first air hole is arranged on the surface of the light exit diaphragm, the second air hole is arranged on the side of the diaphragm, and the light exit hole of the light exit diaphragm is connected to the second air hole; in cooperation with the suction cup, the PCB to be adsorbed has better adsorption and more stable adsorption;

[0023] (3) The PCB is adsorbed, so that the PCB is tightly attached to the light exit diaphragm, defocusing of the light spot is avoided, the edge of the light spot is clearly visible, and the recognition degree is high;

[0024] (4) The overall structure is simpler, and convenient to install and disassemble;

[0025] (5) The light uniformity sheet and the collimating mirror are arranged, and finally cooperate with the light exit diaphragm, so that the shape of the light spot is more regular, the edge of the light spot is clearer, the recognition precision is higher, the light with required properties in various scenes can be formed, and the application scene is wider. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a sectional view of the overall structure of the present application;

[0027] Figure 2 is an enlarged structure schematic view of the present application Figure 1 ;

[0028] Figure 3 is a three-dimensional structure schematic view of the present application;

[0029] Figure 4 is a three-dimensional structure schematic view of the present application after being sleeved into the suction cup;

[0030] Figure 5 is a structure schematic view of the light exit diaphragm and the diaphragm fixing seat of the present application;

[0031] Figure 6 is a structure schematic view of the light source plug-in core of the present application.

[0032] In the figure, 1 is a base, 2 is a light source emitter, 21 is a light source plug-in core, 211 is a sintered small ball, 22 is a light source fixing seat, 23 is a flange plate, 24 is an external thread, 3 is a lens, 31 is a light uniformity sheet, 32 is a collimating mirror, 4 is a light exit diaphragm, 41 is a first air hole, 42 is a diaphragm fixing seat, 43 is a light exit hole, 44 is a second air hole, and 5 is a suction cup. DETAILED DESCRIPTION

[0033] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0034] The specific embodiment is as follows Figures 1-6 As shown: a laser marking device, comprising a base 1 and a light source emitter 2, the base 1 is further provided with a light source ferrule 21, one end of the light source ferrule 21 is connected with the light source emitter 2, and the other end is provided with a lens 3 for adjusting light, and the base 1 is further provided with an exit diaphragm 4 for limiting the aperture of the light beam; the light emitted by the light source emitter 2 passes through the light source ferrule 21, the lens 3 and the exit diaphragm 4 in turn. After the original light source head and the marking head are combined, the structure of the optical fiber as a jumper is cancelled, the light source ferrule 21 is connected with the light source emitter 2, and the other end is directly provided with the lens 3, and the light passing through the light source ferrule 21 can be immediately processed through the lens 3 to have the required properties and then finally emitted through the exit diaphragm 4. The exit diaphragm 4 can be sleeved into a suction cup 5, and the exit diaphragm 4 is provided with a first air hole 41. The suction cup 5 is used for adsorbing the PCB board, and the purpose is to prevent too large gap between the PCB board and the upper surface of the exit diaphragm 4, causing the light spot to be out of focus, so that the edge of the light spot is blurred, affecting the recognition of the mark. Different from the past setting of the air hole on the suction cup 5, the first air hole 41 provided on the exit diaphragm 4 effectively avoids the uneven shape of the negative pressure cavity formed by the suction cup 5 due to the deformation of the suction cup 5 itself after being disassembled for many times, causing the irregular adhesion of the PCB board to the suction cup 5, and finally causing the exit diaphragm 4 sleeved into the suction cup 5 to be unable to completely adhere to the PCB board, so the first air hole 41 is directly provided on the exit diaphragm 4, and the exit diaphragm 4 is directly adhered to the PCB board under the action of external negative pressure. The base 1 is further provided with a diaphragm fixing seat 42 for installing the exit diaphragm 4, the exit diaphragm 4 is provided with an exit hole 43 for emitting light, the diaphragm fixing seat 42 is further provided with a second air hole 44 on the side, and the exit hole 43 and the second air hole 44 are communicated. The second air hole 44 is communicated with the exit hole 43, which can assist the first air hole 41 in forming a negative pressure between the suction cup 5 and the PCB board, and has the same effect as the first air hole 41, and plays a role of adsorption; on the other hand, it can also remove the dust on the upper surface of the lens 3, and the airflow formed in the diaphragm fixing seat 42 can clean the dust and other impurities on the surface of the lens 3 close to the diaphragm fixing seat 42.

[0035] As Figure 1As shown: the lens 3 contains a homogenizing sheet 31. After canceling the structure of the optical fiber as a jumper, the lack of the role of the optical fiber as a homogenizing sheet, so need to increase the homogenizing sheet 31 to achieve the effect of light homogenizing. Homogenizing sheet 31 is transparent material, one side of the homogenizing sheet 31 is frosted, the other side is polished. Lens 3 also contains a collimating mirror 32, the collimating mirror 32 is set on the side of the homogenizing sheet 31 away from the light source emitter 2. Collimating mirror 32 in the optical fiber through the homogenizing sheet 31 homogenizing most of the use of the optical fiber to continue to collimating effect.

[0036] The base 1 also contains a light source fixing seat 22 and flange 23, the flange 23 is provided with screw hole, the outer circle of the light source fixing seat 22 is provided with external thread 24. Light source fixing seat 22 is used to fix the light source emitter 2, fixed light source emitter 2 basically play the role of fixed whole laser marking device, light source fixing seat 22 is located in the center of the flange 23, the external thread 24 can make the light source fixing seat 22 itself can be screwed into the suction cup 5, and then cooperate with the screw hole can be fixed with the suction cup 5, realize the base 1 installation in the suction cup 5. Suction cup 5 contains suction cup 5 body and suction cup 5 cover plate, suction cup 5 body is used to connect with the bottom of the base 1, suction cup 5 cover plate is used to connect with the light exit diaphragm 4 on the top of the bottom plate, and the upper surface of the suction cup 5 cover plate is flush with the upper surface of the light exit diaphragm 4. In the original split type technology, the suction cup 5 body and the suction cup 5 cover plate need to be set for fixing the marking head block, so the installation and removal is troublesome, in the integral type of the present application structure, the block is cancelled to fix the light exit diaphragm 4 and the light source fixing seat 22, directly adopt the diaphragm fixing seat 42 to install on the base 1, also can make the base 1 install on the bottom plate body and the light exit diaphragm 4 install on the bottom plate cover plate structure simple. The base 1 is also provided with a light source pressing nut for fixing the light source emitter 2, the light source pressing nut contains a flat wire and a through hole. Flat wire and through hole can be convenient to hand screw the light source pressing nut, also can use nut wrench and internal hexagonal wrench or metal stick to twist. Moreover, the light source pressing nut is also slotted on the side, which is convenient for threading.

[0037] As shown in Figure 3 and 5 As shown: when the light exit diaphragm 4 is transparent material, the upper surface of the light exit diaphragm 4 is provided with black plating layer, the black plating layer is provided with transparent light exit hole 43 in the middle. When the light exit diaphragm 4 is non transparent material, the light exit diaphragm 4 is provided with light exit hole 43 in the middle. The light exit diaphragm 4 is connected with the diaphragm fixing seat 42 through glue, and a plurality of glue dispensing holes are also arranged on the diaphragm fixing seat 42.

[0038] As shown in Figure 6 The light source plug core 21 is provided with an optical fiber inside, one end of the optical fiber is a sintered ball 211, the other end is a flat plane. The purpose of sintered ball 211 is to improve the propagation efficiency of light and reduce the loss.

[0039] The installation process and working process of the laser marking device are as follows: after the laser marking device is debugged, the base 1 is screwed into the suction cup 5 by using the external thread 24 on the light source fixing seat 22, and is screwed into the remaining nut screws and the like in the flange plate 23 until the upper surface of the light exit diaphragm 4 is flush with the upper surface of the cover plate of the suction cup 5, and the installation work is completed. When starting work, the suction cup 5 needs to be tightly attached to the PCB first, and after being tightly attached, a negative pressure cavity is formed between the suction cup 5 and the PCB, a part of the gas is discharged from the first air hole 41 on the light exit diaphragm 4, and another part of the gas enters the light diaphragm fixing seat 42 from the light exit hole 43 in the middle of the light exit diaphragm 4, and then is discharged through the second air hole 44 located on the side of the light diaphragm fixing seat 42, so that the light exit diaphragm 4 is tightly attached to the PCB and the attaching work is completed; at the same time, the light source emitter 2 emits light, the light first enters the light source plug core 21 directly, and then enters the lens 3 after leaving the sintered ball 211 in the light source plug core 21 to start adjustment, first enters the light uniformizing sheet 31, and then is adjusted by the collimating mirror 32, passes through the light exit hole 43 of the light exit diaphragm 4, and is shot on the PCB, so that the marking of the required mark is completed.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A laser marking device comprising a base (1) and a light source emitter (2), characterized in that: The base (1) is further provided with a light source plug core (21), one end of the light source plug core (21) is connected with the light source emitter (2), the other end is provided with a lens (3) for adjusting light, the lens (3) comprises a light uniformity sheet (31), the base (1) is further provided with an exit light diaphragm (4) for limiting the aperture of the light beam; the light emitted by the light source emitter (2) passes through the light source plug core (21), the lens (3) and the exit light diaphragm (4) in sequence; The exit light diaphragm (4) is sleeved into the suction cup (5), the exit light diaphragm (4) is provided with a first air hole (41); The base (1) is further provided with a diaphragm fixing seat (42) for mounting the exit light diaphragm (4), the exit light diaphragm (4) is provided with an exit light hole (43) for emitting light in the middle, the diaphragm fixing seat (42) is further provided with a second air hole (44) on the side, and the exit light hole (43) and the second air hole (44) are communicated.

2. A laser marking device according to claim 1, characterized in that: The light uniformity sheet (31) is of transparent material, one side of the light uniformity sheet (31) is a frosted surface, and the other side is a polished surface.

3. The laser marking device of claim 1, wherein: The base (1) further comprises a light source fixing seat (22) and a flange plate (23), the flange plate (23) is provided with a screw hole, and the outer circle of the light source fixing seat (22) is provided with an external thread (24).

4. The laser marking device of claim 1, wherein: The base (1) is further provided with a light source compression nut for fixing the light source emitter (2), and the light source compression nut comprises a flat wire and a through hole.

5. The laser marking device of claim 1, wherein: The exit light diaphragm (4) is of transparent material, and the upper surface of the exit light diaphragm (4) is provided with a black plating layer, and the black plating layer is provided with a transparent exit light hole (43) in the middle.

6. The laser marking device of claim 1, wherein: The exit light diaphragm (4) is of non-transparent material, and the exit light diaphragm (4) is provided with an exit light hole (43) in the middle.

7. The laser marking device of claim 1, wherein: The exit light diaphragm (4) and the diaphragm fixing seat (42) are connected by glue, and a plurality of glue dispensing holes are further arranged on the diaphragm fixing seat (42).

8. The laser marking device of claim 1, wherein: The lens (3) further comprises a collimating mirror (32), and the collimating mirror (32) is arranged on the side of the light uniformity sheet (31) away from the light source emitter (2).

9. The laser marking apparatus of claim 1, wherein: The light source plug core (21) is internally provided with an optical fiber, one end of the optical fiber is a sintered small ball (211), and the other end is a ground plane.

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