Periodically planned laser welding device

Abstract

The invention discloses periodically-planned laser welding equipment which comprises a workbench, a pickup head and a welding device. The workbench is used for bearing a circuit substrate. The circuit substrate comprises a plurality of pixels which are arranged regularly. Each of the plurality of pixels includes a welding position, and a fixed spatial relationship exists between the welding positions of the plurality of adjacent pixels. The pick-up head is arranged on the workbench, can move relative to the workbench, and is used for transposing a plurality of photoelectric elements to relative positions of the circuit substrate. The plurality of photoelectric elements correspond to the welding positions of the plurality of pixels. The welding device is arranged on the workbench and can move relative to the workbench. The welding device projects a welding pattern formed by a plurality of welding beams to the welding positions of the corresponding pixels according to the fixed spatial relationship, so that the photoelectric elements in the welding pattern range are welded to the welding positions of the pixels.

Description

Technical Field

[0001] The invention relates to welding equipment, in particular to a periodically planned laser welding equipment. Background Art

[0002] During the production process, the display screen composed of micro optoelectronic components needs to repeat the steps of picking up, transposing and welding to achieve mass or batch transfer. In this production process, each repeated operation takes a period of time, resulting in poor production efficiency.

[0003] Among them, the current laser welding technology after mass or batch transfer can only be fixed-focus and weld one at a time. Fixed focus means that the laser focus is fixed, so during welding, the circuit substrate can only be moved continuously by the platform to make the welded pixel at the laser focus position. In other words, a precise translation mechanism is required on the platform to meet the repeated small interval movement and positioning on the circuit substrate. In this way, the platform structure is complicated and the welding process will accumulate a lot of time, resulting in poor welding efficiency. Summary of the invention

[0004] To solve the above problems, the periodically planned laser welding equipment of the present invention does not need to move the circuit substrate, but can perform welding by moving the welding device. The welding device can simultaneously weld multiple welding positions to provide efficient welding, thereby reducing the process time.

[0005] In order to achieve the above-mentioned purpose, the periodically planned laser welding equipment of the present invention includes a workbench, a pickup head and a welding device. The workbench is used to carry a circuit substrate. The circuit substrate includes a plurality of pixels arranged in a regular pattern. Each of the plurality of pixels includes a welding position, and there is a fixed spatial relationship between the welding positions of the adjacent plurality of pixels. The pickup head is arranged on the workbench and can be moved relative to the workbench, and is used to transpose a plurality of photoelectric elements to relative positions of the circuit substrate. The plurality of photoelectric elements correspond to the welding positions of the plurality of pixels. The welding device is arranged on the workbench and can be moved relative to the workbench. The welding device projects a welding pattern formed by multiple welding beams to the corresponding welding positions of the plurality of pixels according to the fixed spatial relationship, so that the plurality of photoelectric elements within the range of the welding pattern are welded at the welding positions of the plurality of pixels.

[0006] Thus, the platform of the periodically planned laser welding equipment of the present invention only needs to fix the circuit substrate, and the movable welding device can perform the welding operation to simplify the moving mechanism of the platform. Furthermore, the welding device can plan the welding operation of multiple welding positions according to the fixed spatial relationship between the welding positions of adjacent pixels of the circuit substrate to achieve periodicity and effectively reduce the overall welding times to achieve efficient welding.

[0007] The detailed structure or features of the periodically planned laser welding equipment provided by the present invention will be described in the detailed description of the following embodiments. However, those skilled in the art should understand that the detailed description and the specific embodiments listed for implementing the present invention are only applicable to the description of the present invention and are not intended to limit the scope of the patent application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic diagram of a periodically planned laser welding apparatus of the present invention;

[0009] Figure 2 yes Figure 1 An enlarged schematic diagram of 2*2 pixels of the middle circuit substrate;

[0010] Figure 3 yes Figure 1 Schematic diagram of the composition of the welding device;

[0011] Figure 4 So Figure 2 The pixels in the figure present a schematic diagram of a welding pattern projected on the pixels by a welding beam of a welding device;

[0012] Figure 5 and Figure 6 So Figure 2 The pixels in the figure present schematic diagrams of other welding patterns projected on the pixels by the welding beam of the welding device;

[0013] Figure 7 It is a schematic diagram of the welding of 2*2 photoelectric components picked up by the pickup range of the pickup head, transposed and welded on 2*2 pixels;

[0014] Figure 8 and Fig. 9 Continuation Figure 7 The pickup range of the pickup head picks up 2*2 photoelectric components of other luminous colors, transposes them, and welds them in a 2*2 pixel welding diagram;

[0015] Wherein, the reference numerals are:

[0016] 10: Laser welding equipment

[0017] 11: Workbench

[0018] 13: Pickup head

[0019] 131: Pickup range

[0020] 15: Welding device

[0021] 151: Laser Source

[0022] 1511: Light source unit

[0023] 1513: Stabilizer

[0024] 1515: Beam Expander

[0025] 153: Pattern Generator

[0026] 155: Projector

[0027] 1551: Relay

[0028] 1553: Output unit

[0029] 30: Circuit board

[0030] 31: Pixels

[0031] 33,35.37: welding position

[0032] 331,351,371: Solder pad

[0033] 50: Wafer

[0034] 51: Photoelectric components

[0035] D33,D35,D37: length.

[0036] W: Width DETAILED DESCRIPTION

[0037] The applicant first explains that in the entire specification, including the embodiments described below and the claims of the patent application scope, the terms related to directions are based on the directions in the drawings. Secondly, in the embodiments and drawings to be described below, the same element numbers represent the same or similar elements or their structural features.

[0038] like Figure 1 As shown, the adjustable laser welding equipment 10 of the present invention includes a workbench 11 , a pickup head 13 , and a welding device 15 .

[0039] The workbench 11 is used to carry a circuit substrate 30 and a wafer 50. The circuit substrate 30 includes a supporting substrate and a plurality of pixels 31 formed on the supporting substrate. The supporting substrate can be glass or a soft board, etc. The plurality of pixels 31 are conductive circuits arranged at intervals. In this embodiment, 6*6 pixels 31 are shown, and the number of pixels is not limited to the figure. Each of the pixels 31 includes three welding positions 33, 35, and 37, and the three welding positions 33, 35, and 37 are respectively used to weld photoelectric elements of corresponding colors (such as red, blue and green). The wafer 50 includes a plurality of photoelectric elements 51.

[0040] like Figure 2As shown, there is a fixed spatial relationship between the welding positions 33, 35, 37 of adjacent pixels 31. Each welding position 33, 35, 37 of the pixel 31 has two welding pads 331, 351, 371, and the fixed spatial relationship includes the spacing between the side edges of the two welding pads 331, 351, 371 of the welding positions 33, 35, 37 of the adjacent pixels 31, including lengths D33, D35, D37 and widths W. In other embodiments, the fixed spatial relationship may also refer to the distance between the corners of the welding pads of the welding positions of adjacent pixels, and is not limited to length and width.

[0041] Generally speaking, the arrangement of pixels 31 on the circuit substrate 30 is arranged in a regular pattern according to product distribution, such as a matrix arrangement, and the spatial relationship between adjacent pixels 31 is fixed or predictable. In this embodiment, adjacent lengths D33, D35, and D37 are the same, and adjacent widths W are also the same. Therefore, when one of the lengths D33, D35, and D37 and the width W are known, the projection position of the welding beam can be planned accordingly, and periodic transposition and welding planning can be performed.

[0042] In other embodiments, the number of welding locations of each pixel 31 may be less or more, such as less, for example, one or two, or more, for example, more than three, to provide welding locations for repair.

[0043] Please refer to Figure 1 The pick-up head 13 is disposed on the workbench 11 and can move relative to the workbench 11 and has a pick-up range 131. The pick-up range 131 is used to transpose multiple photoelectric components to relative positions of the circuit substrate 30. The pick-up head 13 can pick up a specific number of photoelectric components 51 from the wafer 50, and the number depends on the ability of the pick-up head 13. The picked-up photoelectric components 51 can correspond to multiple pixels 31, so that the pick-up head 13 can transpose the photoelectric components 51 to the relative position or target position of the circuit substrate 30.

[0044] The welding device 15 is disposed on the workbench 11 and can move relative to the workbench 11, and is used to project a welding pattern formed by multiple welding beams to the circuit substrate 30 through a fixed spatial relationship to weld the optoelectronic element 51. The welding device 15 can move relative to the workbench 11 through a gantry, a slide rail, or a robotic arm.

[0045] like Figure 3 As shown, the welding device 15 includes a laser source 151, a pattern generator 153 and a projector 155. The laser source 151 is used to generate a main laser beam. The pattern generator 153 receives the main laser beam and projects multiple welding beams. The projector 155 receives the multiple welding beams and projects them to welding positions of multiple pixels to form a welding pattern.

[0046] The laser source 151 includes a light source unit 1511, a stabilizer (ATT) 1513, and a beam expander 1515. The light source unit 1511 is used to generate a laser beam. The stabilizer 1513 receives the laser beam to ensure better laser stability at low energy. The beam expander 1515 receives the laser beam projected from the stabilizer 1513 to make the laser beam conform to the main laser beam of the spot size required by the pattern generator 153.

[0047] The pattern generator 153 is, for example, a diffractive optical element (DOE), which forms a microstructure on optical glass and utilizes the principle of optical diffraction to diffract the incident light (i.e., the main laser beam) with the microstructure matching the wavelength, thereby generating a plurality of welding light beams with corresponding fixed spatial relationships to form a welding pattern on the circuit substrate 30.

[0048] The projector 155 includes a relay 1551 and an output unit 1553. The relay 1551 is used to receive a plurality of welding beams and transmit them to the output unit 1553. The output unit 1553 is used to project the plurality of welding beams to a corresponding range of the circuit substrate 30. Figure 3 The circuit board 30 is used to indicate that it can receive multiple welding beams, and the circuit board 30 is omitted. Figure 1 The interaction between the pickup head and the circuit substrate 30 and the pixels of the circuit substrate 30.

[0049] The welding pattern is formed in the corresponding range of the circuit substrate 30. In this embodiment, 2*2 pixels 31 are used as an example. The number of welding beams of the welding device can correspond to the number of 2*2 photoelectric elements picked up by the pickup range of the pickup head, such as Figure 4 The dot plot, Figure 5 Line arrangement diagram and Figure 6 Webline graph. Figure 4 The middle welding beam forms a welding pattern of four spots (the elliptical range in the figure) to cover the welding pad 331 of the welding position 33, and then this welding pattern can be used to periodically weld the adjacent welding positions 35 and 37. Figure 5 The spot of the middle welding beam is a linear welding pattern to cover the welding pad 331 of the welding position 33, and then this welding pattern can be used to periodically weld the adjacent welding positions 35 and 37. Figure 6The middle spot is a welding pattern showing a hollow rectangle to cover the welding pad 331 of the welding position 33. This welding pattern can then be used to periodically weld the adjacent welding positions 35 and 37. In other embodiments, when there are more welding positions, such as 3*3 pixels, the spot will be closer to a mesh to cover the welding positions of all pixels. In short, the correspondence between the number of welding beams and the number of photoelectric elements is not limited to one-to-one.

[0050] like Figure 7 As shown, after the pickup head 13 picks up and transposes 2*2 photoelectric elements 51 (indicated by a small dotted rectangular frame in the figure) that can generate red light to the relative position of the circuit substrate 30, the laser welding device 10 of the present invention projects a laser beam at four corresponding welding positions according to the fixed spatial relationship of the welding positions of the pixels, so that the photoelectric element 51 is welded at the welding position 33 of the circuit substrate 30. Subsequently, the operation of the pickup head 13 is repeated to transpose the 2*2 photoelectric elements 51 that generate red light to the adjacent welding position 33, thereby realizing periodic welding operations and improving welding efficiency.

[0051] Then, if Figure 8 and Fig. 9 As shown, Figure 8 It is a continuation Figure 7 , and the photoelectric element that produces red light in the figure is already Figure 7 All welding is completed, and the completed photoelectric components are represented by a small solid rectangular frame, while the welding positions 35 and 37 of each pixel 31 are left, and the previous stage is applied. Figure 7 The welding of the welding position 35 is achieved by the periodic operation of picking up, transferring and welding described in the above. Finally, Fig. 9 In the middle is the continuation Figure 8 , and the photoelectric elements that generate red and green light in the figure are already Figure 8 The completed photoelectric components are indicated by a small solid rectangular frame, and the welding position 37 of each pixel 31 is left, and the previous step is applied. Figure 7 The welding of the welding position 37 is achieved by the periodic operation of picking up, transferring and welding described in the figure.

[0052] Since the laser welding equipment of the present invention can generate welding beams that meet the fixed spatial relationship between the welding positions of adjacent pixels through a pattern generator, and project multiple welding beams to perform welding operations on multiple photoelectric components, the number and time of operations such as picking up materials, alignment, and transposition by the pickup head can be reduced, and batch welding operations can be performed more efficiently. In addition, when a new circuit substrate with a different pixel distribution is replaced, the hardware of the laser welding equipment only needs to replace a suitable pattern generator to continue welding operations in accordance with the fixed spatial relationship of the new circuit substrate, thereby improving the use efficiency of the welding device.

[0053] Finally, the constituent elements disclosed in the aforementioned embodiments of the present invention are only for illustration and are not intended to limit the scope of the present invention. Replacements or changes of other equivalent elements should be covered by the patent application scope of the present invention.

Claims

1. A periodically planned laser welding device, characterized in that: include: A workbench for carrying a circuit substrate, the circuit substrate comprising a plurality of pixels arranged regularly, each of the plurality of pixels comprising a welding position, and the welding positions of the plurality of adjacent pixels having a fixed spatial relationship; a pickup head, disposed on the workbench and movable relative to the workbench, and used to transpose a plurality of photoelectric components to relative positions of the circuit substrate, the plurality of photoelectric components corresponding to welding positions of the plurality of pixels; and A welding device is arranged on the workbench and can move relative to the workbench. The welding device projects a welding pattern formed by multiple welding beams to the corresponding welding positions of the multiple pixels according to the fixed spatial relationship, so that the multiple photoelectric elements within the welding pattern range are welded at the welding positions of the multiple pixels.

2. The periodically planned laser welding device according to claim 1, characterized in that: in, The welding device includes a laser source, a pattern generator and a projector. The laser source is used to generate a main laser beam. The pattern generator receives the main laser beam and projects the multiple welding beams. The projector receives and projects the multiple welding beams.

3. The periodically planned laser welding device according to claim 2, characterized in that: in, The pattern generator includes a diffractive optical element.

4. The periodically planned laser welding device according to claim 1 or 2, characterized in that: in, The spot shape of the multi-welding beam can be a point or a line.

5. The periodically planned laser welding device according to claim 1, characterized in that: in, The welding position includes two welding pads, and the fixed spatial relationship is the distance between the side edges of the welding pads of the welding positions of the plurality of adjacent pixels.

6. The periodically planned laser welding device according to claim 1, characterized in that: in, Each of the plurality of pixels includes another welding position, and another fixed spatial relationship exists between the adjacent another welding positions of the plurality of pixels, and the another fixed spatial relationship is the same as the fixed spatial relationship.

7. The periodically planned laser welding device according to claim 1, characterized in that: in, The number of the multiple welding beams of the welding device corresponds to the number of the multiple photoelectric components picked up by the picking head.

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