Twin beam soldering equipment

Abstract

To provide a twin beam soldering device capable of simply adjusting the interval, inclination, position, heat balance and the like of a twin beam.SOLUTION: A twin beam soldering device at least includes: a fiber core which has a fiber core shaft in a core direction and radiates a rectangular beam around the fiber core shaft; a division prism which divides the rectangular beam radiated from the fiber core by causing a prism ridge to oppose to the fiber core shaft, into a pair of rectangular beams; and an optical lens for condensing the pair of rectangular beams divided by the division prism to a predetermined position. The division prism can move in a shaft direction of the fiber core shaft and can move in a vertical direction with respect to the fiber core shaft, the fiber core can rotate around the fiber core shaft which is extended in the shaft direction of the fiber core, and / or the division prism can rotate around the fiber core shaft.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a twin beam soldering device that splits laser light into twin beams and can solder two locations at a time. [Background technology]

[0002] Patent Document 1 (JP 2013-203052 A) discloses a method for sealing a container and a lid by laser welding, in which a rectangular beam with a uniform intensity distribution is used.

[0003] Patent Document 2 (JP 2007-110064 A) discloses that a laser annealing method is performed by irradiating a semiconductor film formed on the surface of a substrate with a laser beam, and includes a step of generating a linearly polarized rectangular laser beam whose cross section perpendicular to the direction of propagation is rectangular and whose electric field is oriented in the direction of the long side of the rectangle, or an elliptically polarized rectangular laser beam whose major axis is oriented in the direction of the long side.

[0004] Patent Document 3 (Japanese Patent Application Laid-Open No. 2001-23920) discloses that the divergence optical system 71 and the telescope optical system 72 prevent differences in focus position, beam size, and uniformity from occurring in the rectangular beam formed by the homogenizer 41 due to the beam characteristics of the first beam LB1 and the second beam LB2 or differences therebetween.

[0005] Patent Document 4 (JP Patent Publication No. 3-47690) discloses a laser processing robot that guides laser light by moving an arm and irradiates it onto the surface of a workpiece to perform processing. The robot has a tube provided within the arm, with a hole with a rectangular cross section penetrating the center and treated so that the laser light reflects off the surface of the hole with sufficiently small reflection loss, a convex lens provided near one end of the tube, and a collimator lens provided near the other end of the tube. Laser light in a non-rectangular beam mode is focused by the convex lens and enters one end of the tube, where it is reflected a predetermined number of times within the tube and then emitted through the collimator lens, thereby being converted into laser light in a rectangular beam mode. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-203052 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-110064 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-23920 [Patent Document 4] Japanese Patent Application Publication No. 3-47690 Summary of the Invention [Problem to be solved by the invention]

[0007] As electronic components become smaller, there has been an increasing demand for laser soldering devices that can heat welded areas with pinpoint accuracy. In such laser soldering devices, the object (solder material, component, circuit board) irradiated with laser light absorbs the light, generating heat, and soldering is performed by raising the temperature to, for example, 300°C, the temperature required for soldering. In the case of small electronic components, the soldering points are close to each other, so soldering one part raises the temperature of the small electronic component, which then further raises the temperature of the small electronic component, and this can cause problems with the soldering of one part that has been cut and soldered.

[0008] For this reason, the applicant proposed in Patent Application No. 2021-074631 a laser soldering device that can solder both terminals of a small electronic component at the same time using twin beams.

[0009] The applicant also discovered that rectangular laser light is more suitable for soldering work than conventional circular laser light because the shape of the soldering points on small electronic components is square and the output distribution of rectangular laser light is a top-flat distribution.

[0010] Furthermore, when rectangular laser beams are used, unlike circular laser beams, it is desirable to be able to adjust the interval, inclination, position, etc. thereof.

[0011] Therefore, the present invention provides a twin beam soldering device that uses a pair of rectangular lasers and that can easily adjust the spacing, inclination, position, heat balance, etc. of the twin beams. [Means for solving the problem]

[0012] The present invention is a twin beam soldering device that includes at least a fiber core having a fiber core axis in the axial direction and emitting a rectangular beam centered on the fiber core axis, a splitting prism that splits the rectangular beam emitted from the fiber core by having the prism ridge line facing the fiber core axis, and an optical lens that focuses the pair of rectangular beams split by the splitting prism at a predetermined position, wherein the splitting prism is movable in the axial direction of the fiber core axis.

[0013] This allows the splitting prism to move in the axial direction of the fiber core axis, thereby making it possible to change the interval between the pair of rectangular beams.

[0014] It is also preferable that the split prism is movable in a direction perpendicular to the fiber core axis, so that the prism ridgeline is displaced relative to the fiber core axis, thereby changing the laser light intensity of each of the pair of rectangular beams, and thus responding to changes in the heat capacity of the soldering point.

[0015] Furthermore, it is preferable that the fiber core is rotatable about a fiber core axis extending in the axial direction of the fiber core, thereby allowing each of the pair of rectangular beams to be tilted at a predetermined angle.

[0016] Furthermore, it is preferable that the splitting prism is rotatable about the fiber core axis, thereby allowing the positions of the pair of rectangular beams to be changed relative to the fiber core axis.

[0017] Thus, according to the present invention, the spacing, inclination, relative position, and thermal balance of a pair of rectangular beams can be optically changed, thereby making it possible to provide versatility for soldering operations. [Effects of the Invention]

[0018] As described above, according to the present invention, a pair of rectangular beams can be easily optically changed, which makes it possible to easily and reliably solder small electronic components, thereby improving the efficiency of soldering work. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic explanatory diagram showing an example of adjusting the spacing between a pair of rectangular beams of a twin-beam soldering device according to an embodiment of the present invention, where (a) shows an example of widening the spacing and (b) shows an example of narrowing the spacing. [Figure 2]Figure 2 is a schematic diagram showing an example of adjusting the heat quantity of a pair of rectangular beams of a twin beam soldering device according to an embodiment of the present invention, where (a) shows an example of equalizing the heat quantity of one rectangular beam, and (b) shows an example of increasing the heat quantity on one side and decreasing the heat quantity on the other side. [Figure 3] Figure 3 is an explanatory diagram showing the state of soldering electronic components using a pair of rectangular beams, where (a) shows the case where the rectangular beam emission port of the fiber core is normal, and (b) shows an example of soldering in that case. [Figure 4] Figure 4 is an explanatory diagram showing the state of soldering electronic components using a pair of rectangular beams, where (a) shows the state in which the rectangular beam emission port of the fiber core is inclined at 45°, and (b) is an explanatory diagram showing an example of soldering in that case. [Figure 5] Figure 5 is an explanatory diagram showing the state of soldering electronic components using a pair of rectangular beams, where (a) shows the state in which the rectangular beam emission port of the fiber core is tilted by 90 degrees, and (b) is an explanatory diagram showing the soldering state in that case. [Figure 6] FIG. 6 is an explanatory diagram showing the prism ridges of the split prisms in their normal state, where (a) is an explanatory diagram showing the state of the split prisms, and (b) is an explanatory diagram showing an example of soldering in that case. [Figure 7] Figure 7 is an explanatory diagram showing the state in which the prism ridge line of the split prism is inclined at 45 degrees, where (a) is an explanatory diagram showing the inclined state of the split prism, and (b) is an explanatory diagram showing an example of soldering in that case. [Figure 8] Figure 8 is an explanatory diagram showing the state in which the prism ridge line of the split prism is inclined by 90 degrees, where (a) is an explanatory diagram showing the state in which the split prism is rotated by 90 degrees, and (b) is an explanatory diagram showing an example of soldering in that case. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [Example]

[0021] 1 and 2, the twin beam soldering apparatus 1 of the present invention includes at least a fiber core 3 having a fiber core axis A in the axial direction and emitting a rectangular beam 2 centered on the fiber core axis A, a splitter prism 5 having a prism ridge 4 facing the fiber core axis A to split the rectangular beam 2 emitted from the fiber core 3 into a pair of rectangular beams 2A and 2B, and an optical lens 6 that focuses the pair of rectangular beams 2A and 2B split by the splitter prism 5 at predetermined positions. In this embodiment, the splitter prism 5 and the optical lens 6 are shown as individual components in the drawings, but it is preferable that the splitter prism 5 and the optical lens 6 be composed of multiple optical components. Basically, the splitter prism 5 has a structure that splits the rectangular beam 2 onto one side and the other side of the prism ridge 4, and the optical lens 6 has a structure that focuses each of the pair of split rectangular beams 2A and 2B at predetermined positions. These structures are well known to those skilled in the art, so they are shown as individual components in the drawings. The laser beam emission port 3A of the fiber core 3 is formed in a rectangular shape, which allows the rectangular beam 2 to be emitted.

[0022] The pair of rectangular beams 2A, 2B are focused on the soldering points (terminals of the small electronic component 7) 8A, 8B of the small electronic component 7, thereby heating each of the wiring terminals 10, 11 provided on the substrate 9 and soldering the terminals 8A, 8B of the small electronic component 7 to the wiring terminals 10, 11.

[0023] As shown in Figures 1(a) and (b), the splitter prism 5 is designed to be movable relative to the fiber core 3 (movable in the direction along the central axis extending along the longitudinal axis of the fiber core, the central axis of the fiber core).

[0024] When the splitting prism 5 changes from the state shown in Figure 1(a) to the state shown in Figure 1(b), that is, when the splitting prism 5 is moved toward the fiber core 3, in the state shown in Figure 1(b), the width of the rectangular beam 2 passing on both sides of the prism ridge 4 of the splitting prism 5 can be narrowed compared to the case shown in Figure 1(a), and therefore the respective focusing positions of the pair of rectangular beams 2A, 2B split by the splitting prism 5 by the optical lens 6 can be narrowed.

[0025] 2(b) shows the split prism 5, which was positioned as shown in FIG. 1(a), shifted in a direction perpendicular to the fiber core axis A, for example, to the right in the figure. As a result, the prism ridge 4 of the split prism 5 is shifted from the fiber core axis A, so that the laser light intensity of the rectangular beam 2A on one side (left side of the figure) can be made greater than the laser light intensity of the rectangular beam 2B on the other side (right side of the figure). This makes it possible to make the heat quantity of the soldered portion 8A (one terminal of the small electronic component) soldered by the rectangular beam 2A on one side greater than that of the soldered portion 8B (the other terminal of the small electronic component) soldered by the rectangular beam 2B on the other side. This makes it possible to address, for example, the difference in heat capacity between the terminals 8A and 8B of the small electronic component and the wiring 10 and 11 on the board 9 and the soldered portion, thereby adjusting the heat balance.

[0026] Furthermore, the fiber core 3 is designed to be rotatable around a fiber core axis A. Fig. 3(a) shows the case where the irradiation port 3A of the fiber core 3 is in a normal position, which makes it possible to efficiently focus a pair of rectangular beams 2A and 2B on the soldered portions between terminals 8A and 8B of a small electronic component 7 and wirings 10 and 11, as shown in Fig. 3(b), for example.

[0027] Figure 4(a) shows the state where the fiber core 3 is rotated by 45°. As a result, as shown in Figure 4(b), the pair of rectangular beams 2A and 2B can be focused on the soldering point with an inclination of 45°.

[0028] Figure 5(a) shows the state in which the fiber core 3 is rotated by 90°. As a result, as shown in Figure 4(b), the pair of rectangular beams 2A and 2B can be focused on the soldering point in a state inclined by 90° (a state perpendicular to the state in Figure 3).

[0029] The splitting prism 5 is designed to be rotatable around the fiber core axis A. Figure 6(a) shows the splitting prism 5 in its normal state, which allows the pair of rectangular beams 2A and 2B to be efficiently focused on the soldered portions between the terminals 8A and 8B of the small electronic component 7 and the wiring 10 and 11, as shown in Figure 6(b), for example.

[0030] When the splitter prism 5 is rotated 45° from the state shown in Figure 6 to the state shown in Figure 7(a), the focusing positions of the pair of rectangular beams 2A and 2B can be shifted by 45° while maintaining the shape of the rectangular beams 2A and 2B, as shown in Figure 7(b).

[0031] Furthermore, when the splitting prism is rotated by another 45° from the state shown in FIG. 7(a), that is, when it is rotated by 90° from the state shown in FIG. 6(a), the focusing position of the pair of rectangular beams 2A and 2B can be moved from the vertical position shown in FIG. 6(a) to the horizontal position shown in FIG. 8(b).

[0032] As described above, the twin beam soldering device 1 according to the present invention can optically change the spacing, heat balance, inclination, and relative position of the focusing positions of the pair of rectangular beams 2A and 2B, thereby making it possible to provide versatility for soldering work. [Explanation of symbols]

[0033] 1 Twin beam soldering device 2, 2A, 2B rectangular beam 3 Fiber Core 3A radiation port 4 Prism Ridge 5-split prism 6 Optical Lenses 7. Small electronic components 8A, 8B terminals (soldering points) 9 Substrate 10,11 Wiring A Fiber core axis

Claims

[Claim 1] A twin beam soldering device comprising at least a fiber core having a fiber core axis in the axial direction and emitting a rectangular beam centered on the fiber core axis, a splitting prism having a prism ridgeline facing the fiber core axis to split the rectangular beam emitted from the fiber core into a pair of rectangular beams, and an optical lens that focuses the pair of rectangular beams split by the splitting prism at predetermined positions, the splitting prism is movable axially along the fiber core axis; and The splitting prism is movable in a direction perpendicular to the fiber core axis, and the splitting prism is rotatable about the fiber core axis; and A twin beam soldering apparatus, wherein the fiber core is rotatable about a fiber core axis extending in the axial direction of the fiber core.

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