A reflow disk fiber clamp and a reflow soldering method of a fiber device with tail

Abstract

The application discloses a reflow disc fiber clamp and a reflow soldering method of a tail fiber optical device, and belongs to the technical field of optoelectronics. The reflow disc fiber clamp is provided with a bonding part, a fiber returning part and a disc fiber part, and can realize reliable bonding and fixing of the optical device on the clamp, bending of the tail fiber, bending of the disc fiber, and accurate collection of the tail fiber during reflow soldering of the optical device and a PCB board. The reflow disc fiber clamp has the advantages of simple structure, convenient assembly, accurate positioning and bonding of the optical device, stable disc fiber of the tail fiber on the optical device, convenience for alignment reflow soldering between the optical device and the PCB board, avoidance of disorder and dragging of the tail fiber during the reflow soldering process, guarantee of the setting reliability of the optical device and various electrical components on the PCB board during the reflow soldering process, improvement of the assembly and use quality of the optical device, and good practical value and application prospect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optoelectronics, and particularly relates to a reflow disc fiber clamp and a reflow soldering method of an optical device with a fiber tail. BACKGROUND

[0002] In recent years, silicon-based optoelectronics has developed rapidly. Since silicon-based optoelectronic integrated optical devices are fully compatible with microelectronic processes, and the carrier light waves transmitted in silicon-based optoelectronic chips have extremely high frequencies, they can provide extremely large bandwidth for signal transmission, and thus have been increasingly widely applied in many fields and application scenarios.

[0003] After the packaging of the optical device is completed, it needs to be soldered on the PCB board and assembled into the corresponding module. The above process is completed in the SMT furnace, so that the optical path of the optical device needs to be subjected to high-temperature reflow up to 250 DEG C, and thus how the optical device and the fiber tail are not damaged during soldering of the optical device and the PCB board becomes a key problem to be considered.

[0004] Generally, the process steps of soldering the packaged optical device on the PCB board mainly include: 1, the optical device is sucked by the vacuum suction of the patch machine; 2, the suction nozzle is lifted; 3, it is moved above the PCB board; 4, the relative positions of the device and the PCB are aligned by image recognition; 5, the device is pressed and mounted and conveyed into the SMT furnace; 6, high-temperature reflow is soldered with the PCB board; and 7, the soldering of the device is completed by cooling.

[0005] At present, for the above process, there is a lack of effective protection of the optical device fiber tail, which leads to the scattering of the optical fiber, and the optical device is easily disturbed during the on-board process of the optical device, resulting in damage to the product during the soldering process, affecting the service life of the fiber tail and even the optical device. In addition, after the soldering is completed, the cooling process of the device is usually carried out, which usually adopts the cold air cooling method, and this will cause the untreated fiber tail to be blown, causing the displacement of the optical device or affecting the normal setting of other electronic materials on the PCB board, which may also cause the optical fiber to be damaged by pulling, affecting the assembly precision of the optical device, and shortening the service life of the fiber tail and the optical device. SUMMARY

[0006] In view of one or more of the above defects or improvement needs of the prior art, the present application provides a reflow disc fiber clamp and a reflow soldering method of an optical device with a fiber tail, which can effectively meet the fixing needs of the fiber tail during the reflow soldering process of the optical device and the PCB board, realize reliable placement of the fiber tail during the soldering process of the optical device and the PCB board, avoid the dragging and damage of the optical fiber, and ensure the reliability of the assembly and use of the optical device.

[0007] To achieve the above object, one aspect of the present application provides a fiber clamping device for reflow soldering of an optical device and a PCB board, which comprises an adhesive part with an adhesive surface formed on one side thereof, the adhesive surface being used for adhering to an end surface of the optical device body, and

[0008] The adhesive part is provided with a fiber returning part extending in a first direction parallel to the adhesive surface on one side thereof;

[0009] The adhesive part is provided with a fiber discarding part extending in a second direction perpendicular to the adhesive surface on an end thereof away from the adhesive surface;

[0010] The end of the fiber returning part away from the adhesive part is formed with an arc-shaped groove, so that the fiber of the optical device adhered to the adhesive surface can be bent back to the side of the fiber returning part away from the adhesive surface through the arc-shaped groove from the side of the fiber returning part close to the adhesive surface;

[0011] The fiber discarding part comprises a fiber discarding column connected to the adhesive part at one end thereof, and a discarding disc coaxially arranged on the other end of the fiber discarding column and having an outer diameter greater than that of the fiber discarding column; the discarding disc is provided with a fiber end fixing assembly, so that the end of the fiber on the fiber discarding column can be fixed by the fiber end fixing assembly;

[0012] Correspondingly, the fiber discarding part is provided with a suction hole extending through the adhesive part in an axial direction, so that a vacuum suction nozzle for suctioning the optical device can pass through the suction hole from one side of the fiber discarding part and suction the optical device adhered to the adhesive part at the end thereof; meanwhile, the clamping device is made of heat-resistant material and has a temperature resistance not lower than 180℃; and the bending radius of the arc-shaped groove and the radius of the fiber discarding column are both greater than the minimum bending radius of the fiber.

[0013] As a further improvement of the present application, the fiber end fixing assembly comprises at least three fixing columns arranged in intervals on the side of the discarding disc away from the fiber discarding column, and a discarding disc gap is formed on the outer edge of the fixing columns, so that the end of the fiber can extend to the side of the discarding disc away from the fiber discarding column through the discarding disc gap and be fixed after sequentially passing around the at least three fixing columns.

[0014] As a further improvement of the present application, the discarding disc gap is arranged on the side of the discarding disc away from the fiber returning part; and / or

[0015] The distance between the discarding disc gap and the nearest fixing column in the extending direction of the fiber is not less than the outer diameter of a single fixing column;

[0016] and / or

[0017] The fixing column is in a T-shaped columnar structure, and the outer diameter of one end thereof connected to the discarding disc is smaller than that of the other end thereof.

[0018] As a further improvement of the present application, the fiber returning part protrudes from the bonding surface at one side end face close to the bonding surface, so that the side end face of the fiber returning part can be as close as possible to the pigtail after the optical device is bonded to the bonding surface.

[0019] As a further improvement of the present application, a position avoiding groove is formed on the surface of the fiber returning part connecting one end of the bonding part, for avoiding the position of the pigtail joint on the optical device.

[0020] As a further improvement of the present application, a positioning protrusion is arranged at least at one side of the position avoiding groove; the end of the positioning protrusion is flush with the connecting position of the bonding part and the fiber returning part, for positioning when the optical device is bonded and matched;

[0021] And / or

[0022] The clamp is made of synthetic stone, which is made of high-temperature nanofiber felt and high-performance epoxy resin; and / or

[0023] The bonding part, the fiber returning part and the disc fiber part are integrally formed.

[0024] As a further improvement of the present application, an optical fiber limiting member is arranged on the extending path of the pigtail between the arc-shaped groove and the disc fiber column, for limiting in the second direction during the extending process of the pigtail.

[0025] As a further improvement of the present application, the optical fiber limiting member is an arch-shaped interlocking structure, which includes two limiting units arranged oppositely and respectively in “inverted L shape”;

[0026] The two limiting units are respectively connected on the fiber returning part, and the lengths of the two limiting units in the second direction are different, wherein the horizontal branch of one limiting unit extends into the lower side of the horizontal branch of the other limiting unit, forming a “C-shaped” limiting path.

[0027] Another aspect of the present application also provides a reflow soldering method of a pigtailed optical device, which is implemented by using the reflow disc fiber clamp, and includes the following steps:

[0028] (1) positioning and bonding the body of the optical device on the bonding surface by using a high-temperature resistant adhesive, so that the pigtail of the optical device extends towards one end of the arc-shaped groove;

[0029] (2) winding the pigtail around the arc-shaped groove and extending the pigtail to the disc fiber part;

[0030] (3) performing the disc fiber operation on the disc fiber part, and fixing the end of the pigtail by using the pigtail end fixing assembly, thus completing the assembly of the optical device and the clamp;

[0031] (4) controlling the vacuum suction nozzle to pass through the suction hole on the clamp and to suck the body of the optical device with the end part, moving the optical device to a position in alignment with the assembly position on the PCB board, and placing the optical device on the PCB board;

[0032] (5) removing the vacuum suction nozzle, and feeding the optical device and the PCB board into a reflow soldering furnace for reflow soldering;

[0033] (6) after the reflow soldering of the optical device on the PCB board is completed, performing a cooling operation, then taking off the pigtail from the disc fiber part, and releasing the adhesion between the adhesion part and the optical device, thereby completing the reflow soldering of the optical device with the pigtail on the PCB board.

[0034] As a further improvement of the present application, in step (1), the adhesive is silicone rubber, and the components thereof include acrylonitrile-butadiene-styrene;

[0035] and / or

[0036] In step (3), the pigtail is wound counterclockwise on the disc fiber column, and a gap of about 1.5mm-2.5mm is formed between the coil of the optical fiber formed by the winding and the surface of the disc fiber column;

[0037] and / or

[0038] In step (6), the adhesion between the adhesion part and the optical device is released by physically cutting the seam with a thin blade, or by taking a small amount of alcohol, naphtha, mineral oil or methyl ethyl ketone (MEK) to penetrate the adhesion position after degreasing, so as to separate the optical device from the clamp.

[0039] The above improved technical features can be combined with each other as long as they do not conflict with each other.

[0040] Overall, compared with the prior art, the above technical solutions conceived by the present application have the following beneficial effects:

[0041] (1) The reflow pigtail clamp of the present application can realize reliable adhesion and fixation of the optical device on the clamp by the combined arrangement of the adhesion part, the fiber return part and the disc fiber part, and can realize the bending of the fiber return and the disc fiber, thereby ensuring that the pigtail can be accurately collected during the reflow soldering of the optical device and the PCB board, avoiding the problems of fiber dragging and fiber breakage caused by unreasonable collection and placement of the pigtail, and reducing the impact of the pigtail on the accuracy of the reflow soldering process and the stability of the setting of each electronic component on the PCB board, thereby fully ensuring the accuracy and stability of the assembly and setting of the optical device.

[0042] (2) The backflow disc fiber clamp of the present application can realize reliable fixation of the tail fiber end through the setting of the tail fiber end fixation assembly on the disc fiber part, the combination design of the fixing pillar and the gap of the baffle disc, avoid excessive bending, scratching and wear of the tail fiber, fully guarantee the reliability of the subsequent use of the tail fiber, improve the yield of the related products, and reduce the production and application cost of the optical devices and related optoelectronic products.

[0043] (3) The backflow disc fiber clamp of the present application can further improve the accuracy and efficiency of the assembly of the optical device and the clamp through the specific setting of the avoidance groove, the positioning protrusion and the optical fiber limiting piece on the backflow fiber part, guarantee the reliability of the extension of the tail fiber and the bending of the backflow fiber, avoid the problems of excessive bending of the optical fiber and rebound of the optical fiber during the assembly of the optical device and the clamp, provide convenience for the batch assembly of the optical device and the PCB board, and help to reduce the production cost and manufacturing cost of the related products.

[0044] (4) The backflow welding method of the optical device with tail fiber in the present application has simple steps and convenient operation, can guarantee the precision and efficiency of the backflow welding while meeting the reliable backflow welding of the optical device and the PCB board, reduce the influence of the tail fiber on the optical device on the backflow welding process, improve the preparation capacity and production yield of the related products, and has good practical value and application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0046] Figure 1 is a schematic diagram of the backflow disc fiber clamp in the embodiment of the present application;

[0047] Figure 2 , 3 is a schematic diagram of the backflow disc fiber clamp and the optical device after assembly in the embodiment of the present application;

[0048] Figure 4 is a schematic diagram of the backflow disc fiber clamp in the embodiment of the present application;

[0049] Figure 5 is a schematic diagram of the optical device in the embodiment of the present application;

[0050] Figure 6 is a schematic diagram of the backflow disc fiber clamp and the optical device after assembly in the embodiment of the present application;

[0051] Figure 7 ​is a product structure schematic diagram of the optical device after welding on the PCB board in the embodiment of the application;

[0052] In all the drawings, the same reference signs refer to the same technical features, specifically:

[0053] 1, clamp; 101, bonding part; 1011, first bonding surface; 1012, second bonding surface; 102, fiber returning part; 1021, arc-shaped groove; 103, fiber discarding part; 1031, fiber discarding column; 1032, disc; 1033, fixed support column; 1034, disc gap; 104, position avoiding groove; 105, material suction hole; 106, weight reducing hole; 107, optical fiber limiting piece; 108, positioning protrusion;

[0054] 2, optical device; 201, body; 202, fiber pigtail; 203, fiber pigtail;

[0055] 3, material disc; 4, vacuum suction nozzle; 5, PCB board. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the present application clearer and more understandable, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as there is no conflict.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0058] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0059] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0061] Embodiment:

[0062] Please refer to Figures 1-5 The preferred embodiment of the present application includes an adhesive part 101, a disc fiber part 103 arranged at one end of the adhesive part 101, and a return fiber part 102 arranged at one side of the adhesive part 101.

[0063] The adhesive part 101 is used to connect the optical device 2 to be assembled by adhesion, and the tail fiber 203 on the optical device 2 extends to the side of the return fiber part 102, thereby completing the setting of the optical device 2 on the clamp 1. The return fiber part 102 is arranged at one side of the adhesive part 101, and is used for the return of the tail fiber 203 before the disc fiber. The disc fiber part 103 is arranged at one end of the adhesive side of the adhesive part 101, and is used for the disc winding of the optical fiber after the return of the return fiber part 102, thereby realizing the reliable storage of the tail fiber 203 during the soldering assembly of the optical device 2.

[0064] Specifically, the adhesive part 101 of the preferred embodiment has a block structure, one end of which is an adhesive end for adhering the body 201 of the optical device 2 to be assembled at the end.

[0065] In the preferred embodiment, protruding blocks are arranged at the corners of the adhesive end of the adhesive part 101, the end faces of the blocks are flush, and the adhesive faces are formed correspondingly, i.e. the first adhesive faces 1011 arranged at the four corners of the body 201, so as to be adhered tightly to the end face of the box body of the body 201. Preferably, at least two blocks are connected as a whole structure to form a long strip-shaped block structure, so as to increase the area of the adhesive face and improve the adhesion effect.

[0066] For example, in the preferred embodiment as shown in Figure 4 , the two protrusions on the side of the bonding part 101 away from the fiber return part 102 are connected as a whole structure, which is equivalent to forming a long strip-shaped second bonding surface 1012 through the two first bonding surfaces 1011, and forming an "arched" structure at the bonding end of the bonding part 101. With the arrangement of the above structure, a path can be provided for the subsequent injection of the degreasing solvent, facilitating the subsequent operation process. At the same time, it is also beneficial to reduce the self-weight of the bonding part 101.

[0067] Further, as shown in Figure 4 , the fiber return part 102 in the preferred embodiment is arranged on one side of the bonding part 101 along the first direction (such as the horizontal direction as shown in Figure 3 ), and extends along the first direction. The length of the extension is preferably related to the position where the pigtail 203 is connected to the pigtail connector 202 and the length of the connection, so as to ensure that the bending and fiber returning position of the pigtail 203 is away from the connection position of the two.

[0068] In actual arrangement, in order to ensure that the fiber return part 102 can be as close as possible to the pigtail 203, so that the connection end of the pigtail 203 can extend along the first direction, the bottom surface of the fiber return part 102 in the preferred embodiment protrudes from the bonding surface (the end surface of the bonding end) of the bonding part 101, as shown in Figure 3 .

[0069] At the same time, in order to avoid interference between the bottom surface of the fiber return part 102 and the pigtail 203 when they are close to each other and the pigtail connector 202, at least one avoidance groove 104 is arranged on the bottom surface (the side close to the bonding surface) of the fiber return part 102 in the preferred embodiment. The avoidance groove 104 is arranged at the end of the fiber return part 102 connected to the bonding part 101, so that after the optical device 2 is bonded and matched with the clamp 1, the pigtail connector 202 can be just accommodated in the avoidance groove 104.

[0070] Further, at least one positioning protrusion 108 is arranged at the position where the fiber return part 102 is connected to the bonding part 101, which is preferably arranged on the transverse two sides of the avoidance groove 104, and is further preferably flush with the end surface of the fiber return part 102 connected to the bonding part 101, and is preferably two as shown in Figure 4 . The bottom surface of the two positioning protrusions 108 protrudes from the bonding surface, so that when the body 201 is tightly bonded with the bonding surface, one side of the body 201 can abut against one side of the positioning protrusion 108, realizing the positioning of the optical device 2 before bonding.

[0071] In more detail, the return fiber portion 102 in the preferred embodiment extends along the first direction, and an arc-shaped groove 1021 is formed at the end of the return fiber portion 102 away from the bonding portion 101, which extends from the bottom surface of the return fiber portion 102 to the top surface of the return fiber portion 102, so that the pigtail 203 can extend along the first direction in the positive direction (extending out of the bonding portion 101) and then change the extending direction to the first direction in the reverse direction (extending towards the bonding portion 101) after passing through the arc-shaped groove 1021, thereby completing the return of the pigtail 203.

[0072] As shown in Figure 1 , Figure 2 , the disc fiber portion 103 in the preferred embodiment is arranged at one end of the bonding portion 101 and extends along the second direction (vertical direction as shown in Figure 3 ), which is preferably perpendicular to the first direction. At the same time, the disc fiber portion 103 includes a disc fiber column 1031 in a cylindrical shape, one end of which is connected to the bonding portion 101, and at the other end, a blocking disc 1032 is coaxially arranged, which has an outer diameter larger than that of the disc fiber column 1031, for limiting the position of the pigtail 203 after being wound in the vertical direction.

[0073] At the same time, in order to fix the end part of the pigtail 203 after being wound, a blocking disc gap 1034 is preferably formed on the outer edge of the blocking disc 1032, which is preferably formed in an inclined direction and is further preferably arc-shaped in the same direction as the winding direction of the pigtail 203, so that the end part of the pigtail 203 can smoothly transition to the upper side of the blocking disc 1032 through the blocking disc gap 1034.

[0074] Specifically, the blocking disc gap 1034 is preferably formed on the side of the blocking disc 1032 away from the return fiber portion 102, as shown in Figure 1 . Accordingly, at least three fixing pillars 1033 are arranged at intervals on the top of the blocking disc 1032, so that the end part of the pigtail 203 can pass through each fixing pillar 1033 in sequence and be fixed, as shown in Figure 2 .

[0075] In actual arrangement, the blocking disc gap 1034 is formed close to the fixing pillar 1033, and the distance between the blocking disc gap 1034 and the closest fixing pillar 1033 is preferably the width (outer diameter) of one fixing pillar 1033. At the same time, the fixing pillars 1033 are preferably arranged at equal intervals, and the distance between adjacent two fixing pillars 1033 is preferably the position of one fixing pillar 1033, so that the extension and fixation of the end part of the pigtail 203 can be better achieved.

[0076] More preferably, each fixing pillar 1033 is preferably in a T-shaped columnar structure, and the outer diameter of the top is larger than the outer diameter of the end connected to the blocking disc 1032, which can better limit the end part of the pigtail 203.

[0077] Further, the corresponding bonding portion 101 and the disc fiber portion 103 are also provided with a suction hole 105, which is preferably coaxially arranged with the disc fiber portion 103 and / or the bonding portion 101, and the size of the suction hole 105 is preferably corresponding to the outer diameter of the vacuum suction nozzle 4 for sucking the optical device 2, so that the vacuum suction nozzle 4 can pass through the suction hole 105 and be correspondingly sucked at the end to the optical device 2 bonded to the bonding portion 101, and then the optical device 2 is moved together with the clamp 1 to above the PCB board 5 to be assembled, so as to realize the alignment of the assembly position of the optical device 2 and the PCB board 5.

[0078] In more detail, in order to realize the vertical (second direction) limiting of the tail fiber 203 during the fiber extension, the optical fiber limiting member 107 is preferably arranged between the arc-shaped groove 1021 and the disc fiber column 1031, so that the tail fiber 203 passes through the optical fiber limiting member 107 and realizes the limiting during the fiber extension and disc fiber process, avoiding the influence of the rebound of the tail fiber 203 on the disc fiber operation process.

[0079] In a specific preferred embodiment, the optical fiber limiting member 107 is preferably arranged as shown in Figure 1 , which is an arch-shaped interlocking structure, including two oppositely arranged limiting units respectively in the shape of “inverted L”, and the lengths of the two limiting units in the second direction are different, so that the horizontal branch of one limiting unit extends below the horizontal branch of the other limiting unit, forming a “C-shaped” limiting path, so that when the tail fiber 203 extends from the arc-shaped groove 1021 to above the fiber extension portion 102, it can first pass through the optical fiber limiting member 107, so as to avoid the rebound of the tail fiber 203 and ensure the accuracy of the subsequent disc fiber process.

[0080] Further preferably, a plurality of hollow grooves or through holes are arranged on the fiber extension portion 102 as weight reduction holes 106. For example, in the preferred embodiment as shown in Figure 1 , the weight reduction holes 106 are two through holes arranged side by side, which preferably extend along a third direction (the width direction of the clamp) orthogonal to the first direction and the second direction. By arranging the weight reduction holes 106, the weight of the tail end of the disc fiber clamp 1 can be effectively reduced, so that the clamp 1 will not be unstable due to the deviation of the center of gravity from the axis of the bonding portion 101 during subsequent use, ensuring the reliability and stability of the optical device 2 taking and placing.

[0081] In addition, in order to avoid damage caused by bending during the fiber extension and disc fiber process, the bending radius of the arc-shaped groove 1021 and the radius of the disc fiber column 1031 are specially designed, and the radii of the two are greater than the minimum bending radius of the tail fiber 203, and further preferably 1.1-2.0 times the minimum bending radius of the tail fiber 203, which fully guarantees the reliability of the tail fiber 203 during bending.

[0082] In the preferred embodiment, the parts of the clamp 1 are preferably integrally formed without the need for additional assembly, and the clamp 1 has strong integrity. Meanwhile, in addition to the preferred design of the structural features of the clamp 1, the material properties of the clamp 1 are also preferably selected, and the clamp 1 is further preferably made of a heat-resistant material that can withstand a temperature of not less than 180°C and needs to meet the anti-static requirement to ensure that it can normally work in the SMT furnace and avoid softening and deformation of the clamp 1 due to the high-temperature environment.

[0083] In a specific arrangement, the clamp 1 is preferably made of synthetic stone, which is preferably made of high-temperature nanofiber felt and high-performance epoxy resin. The clamp 1 formed therefrom has the advantages of low thermal conductivity, flame retardance, high-temperature resistance, anti-static, light weight, chemical corrosion resistance, etc., and can reliably complete the reflow soldering operation of the optical device 2.

[0084] Of course, according to the actual needs of the arrangement, the clamp 1 can also be made of other heat-resistant materials such as glass fiber material, carbon fiber material, PPS, etc., which will not be described here.

[0085] Further, the adhesive used for bonding the optical device 2 to the clamp 1 in the preferred embodiment needs to be heat-resistant to ensure that it does not naturally fall off when the working temperature is greater than 180°C. In actual selection, the specific gravity of the adhesive is between 1.04 and 1.4, and the Brinell hardness (BHN) is between 25 and 45.

[0086] In more detail, the adhesive in the preferred embodiment is preferably silicone rubber, the main component of which is acrylonitrile-butadiene-styrene (ABS), which is a thermoplastic high-molecular material with high strength, good toughness, and easy processing, and can reliably achieve the tight bonding of the optical device 2 and the clamp 1 in the reflow soldering furnace.

[0087] In actual operation, the silicone rubber is preferably a non-flowing glue, the extrusion rate of which is preferably 157 g / min, and it can continuously work for 10 min at -45°C to 200°C. Meanwhile, in actual bonding, the bonding thickness of the silicone rubber is preferably 0.2-1 mm. In addition, in bonding, the upper and lower bonding surfaces are preferably slightly moved relative to each other to expel the air in the glue, making the bonding more firm, or the vacuum degassing machine is used to remove the air in the glue before use, to ensure the actual bonding effect of the silicone rubber.

[0088] As another aspect of the present application, the reflow soldering method of the optical device 2 based on the aforementioned reflow disc fiber clamp is designed, which preferably includes the following operation process:

[0089] (1) Preparation before operation: after the packaging of the optical device 2 is completed, the top surface of the optical device 2 body 201 and the bonding surface of the clamp 1 are cleaned to ensure that there is no impurity on both surfaces;

[0090] After preparation, the body 201 of the optical device 2 is positioned and bonded on the bonding surface with adhesive, and the pigtail 203 of the optical device 2 extends towards one end of the arc-shaped groove 1021;

[0091] Specifically, a certain thickness of adhesive, for example, 0.5-1mm thick silicone rubber, is applied on the top surface of the body 201 or the bonding surface of the clamp 1, and then the vertical positioning of the optical device 2 and the clamp 1 is achieved by using the positioning of the positioning protrusions 108; then, a certain force is applied to the clamp 1 so that the optical device 2 is attached to the clamp 1, until there is 0.8-1.2mm wide overflow of the adhesive around each bonding position of the clamp 1, and the adhesive is cured after 24h or baking at 60℃ for 1h.

[0092] Preferably, after the adhesive is cured, the overflow part is cleaned with a cotton swab dipped in a small amount of alcohol.

[0093] (2) After the optical device 2 and the clamp 1 are bonded and fastened, the pigtail 203 is wound around the arc-shaped groove 1021 and extended back to the disc fiber part 103;

[0094] During the back fiber process, the pigtail 203 is preferably passed through / inserted into the optical fiber limiting member 107, which limits the pigtail 203 and prevents the pigtail 203 from being damaged by rebounding;

[0095] (3) The disc fiber operation of the pigtail 203 on the disc fiber column 1031 of the disc fiber part 103 is performed, the pigtail 203 is disc fibered on the disc fiber column 1031, and the end of the pigtail 203 extends above the blocking disc 1032 via the blocking disc gap 1034, and then it is wound around each fixed support 1033 and fixed at the end, completing the fixation of the optical device 2 on the clamp 1 and the disc fiber of the pigtail 203;

[0096] In more detail, before disc fiber, the pigtail 203 needs to be arranged smoothly, and further preferably wound counterclockwise along the disc fiber column 1031, and a gap of about 1.5mm-2.5mm is formed between the fiber coil formed by the winding and the surface of the disc fiber column 1031;

[0097] (4) The clamp 1 and the optical device 2 after assembly are placed in the tray 3, and they are moved to the assembly position of the optical device 2 and the PCB board 5 by the tray 3; then, the rod-shaped vacuum suction nozzle 4 is aligned with the suction hole 105 on the corresponding clamp in the tray 3, and the end of the vacuum suction nozzle 4 is inserted into the suction hole 105 to suck the top surface of the optical device 2; after the suction is completed, the position of the vacuum suction nozzle 4 is moved to a position vertically aligned with the assembly position on the PCB board 5, and the clamp 1 with the optical device 2 is placed on the PCB board 5, as shown in Figure 6 .

[0098] (5) remove the vacuum suction nozzle 4, and send the light device 2 (with the clamp 1) and the PCB 5 into the reflow soldering furnace, and complete the reflow soldering with corresponding control parameters;

[0099] (6) after the welding of the light device 2 on the PCB 5 is completed, the cooling of the PCB 5 is performed and the PCB 5 is taken out of the reflow soldering furnace;

[0100] After the product is cooled, the tail fiber 203 is scattered from the disc fiber part 103, and then the separation operation between the bonding part 101 and the body 201 is performed;

[0101] In actual separation operation, a thin blade is preferably used to physically cut the seam, that is, the cured adhesive material at each position is cut by extending the thin blade between the bonding surface and the bonding position.

[0102] In the preferred embodiment, the separation of the adhesive preferably uses the following process:

[0103] After a small amount of alcohol or ligroin, mineral oil, methyl ethyl ketone (MEK) or other suitable solvent is degreased and infiltrates the glue bonding part from the bottom of the disc fiber clamp 1, the separation between the light device 2 and the disc fiber clamp 1 is easily achieved; thereafter, the surfaces of the light device 2 and the disc fiber clamp 1 are preferably further degreased and cleaned with alcohol or ligroin, mineral oil, methyl ethyl ketone (MEK) or other suitable solvent, to ensure the cleanliness of the product (PCB 5 with the light device 2) and the clamp 1, and to realize the recycling of the clamp 1.

[0104] (7) repeat the above steps (1) to (6) to complete the batch assembly of the light device 2.

[0105] The reflow disc fiber clamp in the present application has the advantages of simple structure, convenient assembly, accurate positioning and bonding with the light device, stable disc fiber of the tail fiber on the light device, provision of conditions for subsequent alignment and reflow soldering between the light device and the PCB, avoidance of disorder and dragging of the tail fiber during reflow soldering, guarantee of the setting reliability of the electrical components on the light device and the PCB during reflow soldering, improvement of the assembly and use quality of the light device, and good practical value and application prospect.

[0106] Those skilled in the art will readily understand that the above description is only a preferred embodiment of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A reflow disk fiber clamp for reflow soldering of an optical device to a PCB board; characterized by, The fixture comprises a bonding part with a bonding surface formed on one side thereof, the bonding surface being used for bonding the end surface of the optical device body; and One side of the bonding part is provided with a fiber returning part extending in a first direction parallel to the bonding surface; One end of the bonding part away from the bonding surface is provided with a fiber coiling part extending in a second direction perpendicular to the bonding surface; The end of the fiber returning part away from the bonding part is formed with an arc-shaped groove, so that the fiber of the optical device bonded on the bonding surface can be bent back to the side of the fiber returning part away from the bonding surface through the arc-shaped groove. The fiber coiling part comprises a fiber coiling column connected to one end of the bonding part, and a blocking disc with an outer diameter larger than that of the fiber coiling column coaxially arranged on the other end of the fiber coiling column; the blocking disc is provided with a fiber end fixing assembly, so that the end of the fiber coiled on the fiber coiling column can be fixed by the fiber end fixing assembly. Correspondingly, the fiber coiling part is provided with a suction hole extending through the bonding part in an axial direction, so that a vacuum suction nozzle used for suction and removal of the optical device can pass through the suction hole from one side of the fiber coiling part and suck the optical device bonded on the bonding part by the end thereof; meanwhile, the fixture is made of heat-resistant material, and the resistance temperature thereof is not less than 180℃; and the bending radius of the arc-shaped groove and the radius of the fiber coiling column are both larger than the minimum bending radius of the fiber.

2. The reflow tray fiber gripper of claim 1, wherein, The fiber end fixing assembly comprises at least three fixed columns arranged in a spaced manner on the side of the blocking disc away from the fiber coiling column, and a blocking disc gap is formed on the outer edge of the fixed columns, so that the end of the fiber can extend to the side of the blocking disc away from the fiber coiling column through the blocking disc gap and be fixed after sequentially passing around the at least three fixed columns.

3. The reflow tray fiber gripper of claim 2, wherein, The blocking disc gap is arranged on the side of the blocking disc away from the fiber returning part; And / or The distance between the blocking disc gap and the nearest fixed column in the fiber extension direction is not less than the outer diameter of a single fixed column; And / or The fixed column is in a T-shaped columnar structure, and the outer diameter of one end of the fixed column is smaller than that of the other end.

4. The reflow tray fiber gripper of any of claims 1-3, wherein, The end surface of the fiber returning part on the side close to the bonding surface protrudes from the bonding surface, so that the end surface of the fiber returning part can be as close as possible to the fiber after the optical device is bonded on the bonding surface.

5. The reflow tray fiber gripper of claim 4, wherein, An avoiding groove is formed on the surface of one end of the fiber returning part connected to the bonding part, and is used for avoiding the fiber joint of the optical device.

6. The reflow tray fiber gripper of claim 5, wherein, A positioning protrusion is arranged on at least one side of the avoiding groove, and the end of the positioning protrusion is flush with the connection position of the bonding part and the fiber returning part, and is used for positioning when the optical device is bonded and matched; And / or The fixture is made of synthetic stone, and the synthetic stone is made of high-temperature nanofiber felt and high-performance epoxy resin; And / or The bonding part, the fiber returning part and the fiber coiling part are integrally formed.

7. The reflow tray fiber gripper of any of claims 1-3, 5, 6, wherein, An optical fiber limiting member is arranged on the fiber extension path between the arc-shaped groove and the fiber coiling column, and is used for limiting the fiber in the second direction during the fiber returning and extending process.

8. The reflow tray fiber gripper of claim 7, wherein, The optical fiber limiting member is in an arch-shaped interlocking structure, and comprises two opposite limiting units each in an "inverted L-shaped" structure. Two limiting units are connected to the fiber return part, and the lengths of the two limiting units along the second direction are different, wherein the horizontal branch of one limiting unit extends below the horizontal branch of the other limiting unit, forming a "C-shaped" limiting path.

9. A reflow soldering method of a pigtailed optical device, characterized by, The reflow soldering method utilizes the reflow disk fiber clamp according to any one of claims 1-8, and comprises the following steps: (1) positioning and bonding the body of the optical device on the bonding surface with a high-temperature-resistant adhesive, so that the pigtail of the optical device extends towards one end of the arc-shaped groove; (2) passing the pigtail around the arc-shaped groove and extending the pigtail to the disk fiber part; (3) performing the disk fiber operation of the pigtail on the disk fiber part, and fixing the end of the pigtail by the pigtail end fixing assembly, thereby completing the assembly of the optical device and the clamp; (4) controlling the vacuum suction nozzle to pass through the suction hole on the clamp and suction the body of the optical device by the end, moving the optical device to a position aligned with the assembly position on the PCB, and placing the optical device on the PCB; (5) removing the vacuum suction nozzle, and feeding the optical device and the PCB into the reflow soldering furnace for reflow soldering; (6) after completing the reflow soldering of the optical device on the PCB, performing the cooling operation, then removing the pigtail from the disk fiber part, and releasing the bonding between the bonding part and the optical device, thereby completing the reflow soldering of the pigtail optical device and the PCB.

10. The reflow soldering method of the pigtail optical device according to claim 9, wherein in step (1), the adhesive is silicone rubber, and the components of the silicone rubber include acrylonitrile-butadiene-styrene; and / or in step (3), the disk fiber of the pigtail on the disk fiber column is counterclockwise, and the gap between the optical fiber coil formed by the disk fiber and the surface of the disk fiber column is about 1.5-2.5 mm wide; and / or in step (6), the method for releasing the bonding between the bonding part and the optical device is physical cutting of the joint by a thin blade, or after degreasing with a small amount of alcohol, naphtha, mineral oil or methyl ethyl ketone (MEK), the adhesive is penetrated into the bonding position to separate the optical device from the clamp.

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