CN104226568A - LED (Light emitting diode) fluorescent powder coating method and system based on 3D printing principle - Google Patents
LED (Light emitting diode) fluorescent powder coating method and system based on 3D printing principle Download PDFInfo
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- CN104226568A CN104226568A CN201410387682.6A CN201410387682A CN104226568A CN 104226568 A CN104226568 A CN 104226568A CN 201410387682 A CN201410387682 A CN 201410387682A CN 104226568 A CN104226568 A CN 104226568A
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Abstract
The invention relates to an LED (Light emitting diode) fluorescent powder coating method and system based on a 3D printing principle. The LED fluorescent powder coating methods, which are utilized in industry, all have the problems of badly affecting the packaging quality, such as thermal resistance dispersion, chroma consistency, light emitting efficiency and the like, of white LEDs due to uneven coating thickness. According to the LED fluorescent powder coating method and system, a vacuum stirring defoaming device is used for defoaming fluorescent powder glue through improving the conventional coating technique; a piezoelectric coating nozzle is used for heating and performing constant temperature control, so that the function of reducing and stabilizing the viscosity of the fluorescent powder glue is realized; the piezoelectric coating nozzle based on the 3D printing principle is used for controlling the size and the number of the fluorescent powder glue particles which are sprayed every time; a high-precision movement xyz-axis movement platform is used for controlling the coating positions of the fluorescent powder glue particles which are sprayed every time, so that the fluorescent powder coating precision of a large-power white LED chip or chip module is improved, therefore the protective coating requirements on the thickness and the shape of the fluorescent powder layer of the large-power white LED chip module are met.
Description
Technical field
The present invention relates to LED fluorescent powder paint-on technique field, particularly relate to a kind of the LED fluorescent powder painting method and the system that print principle based on 3D.
Background technology
White light LEDs is all solid state lighting source of a kind of novel semi-conductor.Compared with conventional lighting technology, this new type light source has the leading superiorities such as energy-efficient, long-life, small size, easy care, environmental protection, use safety, good weatherability, is acknowledged as first choice of following lighting source.
White-light LED encapsulation promotes international semiconductor illumination and shows the critical process that develops rapidly, and fluorescent powder coated be realize the mainstream technology that blue-ray LED changes to white light LEDs at present in the world.And the uneven thickness of fluorescent material coating is the main cause causing white light LEDs angle colour temperature difference.At present, high-power LED fluorescent powder coating processes mainly realizes by dotting glue method and spraying process two kinds of methods, and these two kinds of traditional control methods all cannot ensure under large-scale industrial production, the uniformity of fluorescent material coated weight each time, namely the coating thickness of phosphor powder layer has nuance each time.Thus make the large power white light LED produced effectively cannot improve the package quality such as thermal resistance dispersiveness, chromaticity uniformity, light extraction efficiency of white-light LED encapsulation.3D printing technique is a kind of based on mathematical model file, uses powdery metal or plastics etc. can jointing material, is carried out the technology of constructed object by the mode successively printed.
The present invention, on the basis of existing coating processes, adds vacuum stirring defoaming device for simplifying existing coating processes, the micro-bubble contained after effectively removing phosphor gel mixing; Adding shower nozzle thermostatically-controlled equipment for carrying out thermostatic control to piezoelectricity fluorescent material shower nozzle, reaching the object reducing and stablize the phosphor gel viscosity in described piezoelectricity fluorescent material shower nozzle; Based on the principle that 3D prints, use piezoelectricity fluorescent material shower nozzle (the PICO Series Piezoelectric shower nozzle that such as EFD company produces) that phosphor powder layer is printed to LED chip, make it overcome the shortcoming of conventional coating process, reach the coating effect of high accuracy high evenness.
Summary of the invention
An object of the present invention is to provide a kind of the LED fluorescent powder painting method and the system that print principle based on 3D, and effectively can improve the uniformity of fluorescent material coated weight and coating thickness, improve quality light source and the yield rate of white light LEDs, concrete technical scheme is as follows.
A kind of LED fluorescent powder application system printing principle based on 3D, for completing guarantor's type coating operation of phosphor powder layer thickness in LED chip and shape, comprise lower computer system and master system, lower computer system comprises piezoelectricity fluorescent material shower nozzle and xyz axle motion platform; Master system comprises coating control module and motion-control module; Described lower computer system also comprises shower nozzle thermostatically-controlled equipment and vacuum stirring defoaming device, and master system also comprises de-bubble control module; Coating control module connects piezoelectricity fluorescent material shower nozzle and shower nozzle thermostatically-controlled equipment respectively, and de-bubble control module connects vacuum stirring defoaming device, and motion-control module connects xyz axle motion platform, and piezoelectricity fluorescent material shower nozzle is arranged on xyz axle motion platform; Print principle control piezoelectricity fluorescent material shower nozzle by coating control module and motion-control module based on 3D in LED chip, apply described phosphor powder layer.
Preferred further, described piezoelectricity fluorescent material shower nozzle uses piezoelectric ceramics, the phosphor gel of shower nozzle inside is squeezed out shower nozzle outside, for sprayed with fluorescent powder glue by the deformation of piezoelectric ceramics.
Preferred further, described shower nozzle thermostatically-controlled equipment comprises heating wire and thermistor, and heating wire and thermistor are arranged on inside or the outside of described piezoelectricity fluorescent material shower nozzle, for carrying out thermostatic control to described piezoelectricity fluorescent material shower nozzle.
Preferred further, described vacuum stirring defoaming device comprises: phosphor gel container, for storing phosphor gel to be coated; Driven stirring rod, driven stirring rod stretches into phosphor gel container, for stirring phosphor gel from described phosphor gel vessel port; Air door, air door is arranged on described phosphor gel vessel port, for extracting the air in phosphor gel container out; By air door, the air of the phosphor gel internal tank that phosphor gel to be coated is housed is extracted out, form vacuum environment, driven stirring rod constantly stirs under vacuum conditions, and in handle assembly, the bubble of phosphor gel is stirred to the final elimination in phosphor gel surface from the bottom of device.
Preferred further, xyz axle motion platform adopts servomotor and linear electric motors, moves on xyz direction of principal axis for controlling described piezoelectricity fluorescent material shower nozzle.
Preferred further, coating control module, for controlling fluorescent material droplet size in piezoelectricity fluorescent material shower nozzle coating procedure, spraying quantity and controlling shower nozzle thermostatically-controlled equipment, heated constant temperature control is carried out to piezoelectricity fluorescent material shower nozzle, thus the viscosity of reduction and stable shower nozzle Internal Fluorescent arogel; Tell motion-control module carries out xyz axis to piezoelectricity fluorescent material shower nozzle movement for control xyz axle motion platform; Described de-bubble control module, carries out de-bubble operation for controlling vacuum stirring defoaming device to the phosphor gel just mixed.
Use the above-mentioned painting method printing the LED fluorescent powder application system of principle based on 3D, wherein apply size and quantity that control module controls the phosphor gel droplet that piezoelectricity fluorescent material shower nozzle sprays at every turn; Motion-control module is moved by control xyz axle motion platform thus controls the coating position of the phosphor gel droplet that piezoelectricity fluorescent material shower nozzle sprays at every turn, specifically comprises the following steps:
4.1 set LED chip position to be coated, size at master system, the shape of phosphor powder layer and thickness information, the phosphor powder layer 3D then calculating the size of phosphor gel droplet that piezoelectricity fluorescent material shower nozzle sprays at every turn and the controling parameters of quantity and piezoelectricity fluorescent material shower nozzle prints and sprays path clustering parameter;
4.2 de-bubble control modules control the bubble that vacuum stirring defoaming device eliminates the phosphor gel inside just mixed in phosphor gel container, and meanwhile, coating control module is heated to operating temperature by shower nozzle thermostatically-controlled equipment piezoelectricity fluorescent material shower nozzle;
4.3 after step 4.2 completes, and motion-control module moves to piezoelectricity fluorescent material shower nozzle above LED chip to be coated by control xyz axle motion platform;
4.4 after step 4.3 completes, use the controling parameters that step 4.1 calculates, coating control module and motion-control module print principle control piezoelectricity fluorescent material shower nozzle based on 3D in LED chip, apply described phosphor powder layer, specifically motion-control module moves according to 3D printing spraying path clustering state modulator xyz axle motion platform, applies control module simultaneously and in LED chip, prints required phosphor powder layer according to the controling parameters control piezoelectricity fluorescent material shower nozzle of the size of phosphor gel droplet and quantity;
4.5 judge whether to need to apply next LED chip, if needed, then forward step 4.3 to; If completed, then terminate.
The present invention, on the basis of traditional dotting glue method and spraying process two kinds of coating processes, adds vacuum stirring defoaming device for simplifying existing coating processes, the micro-bubble contained after effectively removing phosphor gel mixing, add shower nozzle thermostatically-controlled equipment for carrying out thermostatic control to piezoelectricity fluorescent material shower nozzle, reach the object reducing and stablize the phosphor gel viscosity in described piezoelectricity fluorescent material shower nozzle, and adopt the size and the quantity that print the phosphor gel droplet of each ejection of piezoelectricity coating shower nozzle control of principle based on 3D, high-precision motion xyz axle motion platform is adopted to control the coating position of the phosphor gel droplet of each ejection, realize the fluorescent material coating procedure accurately controlling large power white light LED chip or chip module, thus reach guarantor's type coating requirement of phosphor powder layer thickness and shape in large power white light LED chip module.
The present invention compared with prior art, have the following advantages and beneficial effect: the present invention adopts the fluorescent material painting method printing principle based on 3D, use piezoelectricity fluorescent material shower nozzle as fluorescent material printhead, high-power LED chip prints required fluorescent coating, can be applied in the fluorescent material coating encapsulation process of large power white light LED or LED chip module, but also can be applied in the coating of wafer level chip, accurately can control the coated weight of the coating glue of various viscosity, coating layer thickness and layer shape, greatly improve the coating precision of fluorescent coating, and ensure the uniformity of coating layer thickness.
Accompanying drawing explanation
Fig. 1 is the LED fluorescent powder application system block diagram printing principle based on 3D provided by the invention.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
Described in a kind of LED fluorescent powder application system printing principle based on 3D of this example as shown in Figure 1, master system 11 and lower computer system 10 is comprised.Lower computer system comprises piezoelectricity fluorescent material shower nozzle 12 and xyz axle motion platform 14; Master system comprises coating control module 16 and motion-control module 17; Described lower computer system also comprises shower nozzle thermostatically-controlled equipment 13 and vacuum stirring defoaming device 15, and master system also comprises de-bubble control module 18; Coating control module connects piezoelectricity fluorescent material shower nozzle and shower nozzle thermostatically-controlled equipment respectively, and de-bubble control module connects vacuum stirring defoaming device, and motion-control module connects xyz axle motion platform, and piezoelectricity fluorescent material shower nozzle is arranged on xyz axle motion platform; Print principle control piezoelectricity fluorescent material shower nozzle by coating control module and motion-control module based on 3D in LED chip, apply described phosphor powder layer
Preferably, described piezoelectricity fluorescent material shower nozzle 12 uses piezoelectric ceramics, the phosphor gel of shower nozzle inside is squeezed out shower nozzle outside, for sprayed with fluorescent powder glue by the deformation of piezoelectric ceramics; Described shower nozzle thermostatically-controlled equipment 13 comprises heating wire and thermistor, and heating wire and thermistor are arranged on inside or the outside of described piezoelectricity fluorescent material shower nozzle 12, for carrying out thermostatic control to described piezoelectricity fluorescent material shower nozzle 12; Described vacuum stirring defoaming device 15 comprises phosphor gel container, for storing phosphor gel to be coated; Driven stirring rod, driven stirring rod stretches into phosphor gel container, for stirring phosphor gel from described phosphor gel vessel port; Air door, air door is arranged on described phosphor gel vessel port, for extracting the air in phosphor gel container out; By air door, the air of the phosphor gel internal tank that phosphor gel to be coated is housed is extracted out, form vacuum environment, driven stirring rod constantly stirs under vacuum conditions, and in handle assembly, the bubble of phosphor gel is stirred to the final elimination in phosphor gel surface from the bottom of device; Xyz axle motion platform 14 uses servomotor, linear electric motors, moves on xyz direction of principal axis for controlling described piezoelectricity fluorescent material shower nozzle 12.
Coating control module 16, heated constant temperature control is carried out for controlling fluorescent material droplet size in piezoelectricity fluorescent material shower nozzle 12 coating procedure, spraying quantity and controlling shower nozzle thermostatically-controlled equipment 13 pairs of piezoelectricity fluorescent material shower nozzles 12, thus the viscosity of reduction and stable shower nozzle Internal Fluorescent arogel; Tell motion-control module 17 carries out xyz axis movement for control xyz axle motion platform 14 pairs of piezoelectricity fluorescent material shower nozzles 12; Described de-bubble control module 18, carries out de-bubble operation for controlling vacuum stirring defoaming device 15 to the phosphor gel just mixed.
The LED fluorescent powder painting method printing principle based on 3D of this example, comprises the following steps and content:
Step (1) is in coating control module 16, set LED chip position to be coated, size, the information such as the shape of desirable fluorescent bisque and thickness, then calculate the controling parameters of size of the phosphor gel droplet of each ejection piezoelectricity fluorescent material shower nozzle and the desirable fluorescent bisque 3D of piezoelectricity fluorescent material shower nozzle to print and spray path clustering parameter etc. and apply controling parameters, its algorithm is as follows:
αV
t＝NV
r
Wherein, V
tfor LED chip to be coated uses guarantor's type cladding process to need the phosphor gel amount used in theory, can be calculated by information such as the thickness of the length of LED chip to be coated and phosphor powder layer; V
rfor piezoelectricity fluorescent material shower nozzle 12 reality needs the glue amount of the fluorescent material droplet sprayed each time, need according to different LED chip sizes and phosphor powder layer thickness, (such as: the length of side is the high-power LED chip of 1.5 millimeters, measured best droplet glue amount is 16 picoliters to obtain actual best droplet glue amount by experiment; The length of side is the high-power LED chip of 1.0 millimeters, and measured best droplet glue amount is 13 picoliters; The length of side is the high-power LED chip of 0.83 millimeter, and measured best droplet glue amount is 10 picoliters), or the minimum droplet glue amount (8 picoliter) directly using piezoelectricity fluorescent material shower nozzle to spray; α is the conversion coefficient of theoretical value and actual value, needs the phosphor gel according to different viscosities, obtains best conversion coefficient by experiment; N is that LED chip to be coated uses the coating of 3D printing principle in fact to need the number of droplets applied, can according to known parameter V
t, V
r, α calculates.Pass through V
rthe position offset coordinates of fluorescent material droplet next to be sprayed in the control voltage of pressure piezoelectricity fluorescent material shower nozzle 12 and the 3D print track of current LED chip can be calculated with the viscosity of phosphor gel;
Step (2) uses the bubble of the phosphor gel inside just mixed in vacuum stirring defoaming device 13 cancellation element, meanwhile, by shower nozzle thermostatically-controlled equipment 15, piezoelectricity fluorescent material shower nozzle 12 is heated to operating temperature;
Step (3), after step (2) completes, moves to piezoelectricity fluorescent material shower nozzle 12 above LED chip to be coated by xyz axle motion control device 14;
Step (4) is after step (3) completes, use step (1) the coating controling parameters that calculates, control piezoelectricity fluorescent material shower nozzle and in 3D print track, spray a multiple or fluorescent material droplet (quantity of droplet depends on the needs of user.If need to enhance productivity, then reduce the quantity of single chip LED chip coating fluorescent material droplet; If need to improve fluorescent material coating precision, then increase the quantity of single chip LED chip coating fluorescent material droplet), complete current LED chip based on fluorescent material coating work;
Step (5) judges whether to need to apply next LED chip, if needed, then forwards step (3) to; If completed, then terminate.
Claims (7)
1. one kind prints the LED fluorescent powder application system of principle based on 3D, for completing guarantor's type coating operation of phosphor powder layer thickness in LED chip and shape, comprise lower computer system and master system, lower computer system comprises piezoelectricity fluorescent material shower nozzle and xyz axle motion platform; Master system comprises coating control module and motion-control module; It is characterized in that, lower computer system also comprises shower nozzle thermostatically-controlled equipment and vacuum stirring defoaming device, and master system also comprises de-bubble control module; Coating control module connects piezoelectricity fluorescent material shower nozzle and shower nozzle thermostatically-controlled equipment respectively, and de-bubble control module connects vacuum stirring defoaming device, and motion-control module connects xyz axle motion platform, and piezoelectricity fluorescent material shower nozzle is arranged on xyz axle motion platform; Print principle control piezoelectricity fluorescent material shower nozzle by coating control module and motion-control module based on 3D in LED chip, apply described phosphor powder layer.
2. the LED fluorescent powder application system printing principle based on 3D according to claim 1, it is characterized in that, described piezoelectricity fluorescent material shower nozzle uses piezoelectric ceramics, the phosphor gel of shower nozzle inside is squeezed out shower nozzle outside, for sprayed with fluorescent powder glue by the deformation of piezoelectric ceramics.
3. the LED fluorescent powder application system printing principle based on 3D according to claim 1, is characterized in that,
Described shower nozzle thermostatically-controlled equipment comprises heating wire and thermistor, and heating wire and thermistor are arranged on inside or the outside of described piezoelectricity fluorescent material shower nozzle, for carrying out thermostatic control to described piezoelectricity fluorescent material shower nozzle.
4. the LED fluorescent powder application system printing principle based on 3D according to claim 1, it is characterized in that, described vacuum stirring defoaming device comprises: phosphor gel container, for storing phosphor gel to be coated; Driven stirring rod, driven stirring rod stretches into phosphor gel container, for stirring phosphor gel from described phosphor gel vessel port; Air door, air door is arranged on described phosphor gel vessel port, for extracting the air in phosphor gel container out; By air door, the air of the phosphor gel internal tank that phosphor gel to be coated is housed is extracted out, form vacuum environment, driven stirring rod constantly stirs under vacuum conditions, and in handle assembly, the bubble of phosphor gel is stirred to the final elimination in phosphor gel surface from the bottom of device.
5. the LED fluorescent powder application system printing principle based on 3D according to claim 1, is characterized in that, xyz axle motion platform adopts servomotor and linear electric motors, moves on xyz direction of principal axis for controlling described piezoelectricity fluorescent material shower nozzle.
6. the LED fluorescent powder application system printing principle based on 3D according to claim 1, is characterized in that,
Coating control module, for controlling fluorescent material droplet size in piezoelectricity fluorescent material shower nozzle coating procedure, spraying quantity and controlling shower nozzle thermostatically-controlled equipment, heated constant temperature control is carried out to piezoelectricity fluorescent material shower nozzle, thus the viscosity of reduction and stable shower nozzle Internal Fluorescent arogel;
Tell motion-control module carries out xyz axis to piezoelectricity fluorescent material shower nozzle movement for control xyz axle motion platform;
Described de-bubble control module, carries out de-bubble operation for controlling vacuum stirring defoaming device to the phosphor gel just mixed.
7. use a painting method for the LED fluorescent powder application system printing principle described in claim 1 based on 3D, it is characterized in that, coating control module controls size and the quantity of the phosphor gel droplet that piezoelectricity fluorescent material shower nozzle sprays at every turn; Motion-control module is moved by control xyz axle motion platform thus controls the coating position of the phosphor gel droplet that piezoelectricity fluorescent material shower nozzle sprays at every turn, specifically comprises the following steps:
4.1 set LED chip position to be coated, size at master system, the shape of phosphor powder layer and thickness information, the phosphor powder layer 3D then calculating the size of phosphor gel droplet that piezoelectricity fluorescent material shower nozzle sprays at every turn and the controling parameters of quantity and piezoelectricity fluorescent material shower nozzle prints and sprays path clustering parameter;
4.2 de-bubble control modules control the bubble that vacuum stirring defoaming device eliminates the phosphor gel inside just mixed in phosphor gel container, and meanwhile, coating control module is heated to operating temperature by shower nozzle thermostatically-controlled equipment piezoelectricity fluorescent material shower nozzle;
4.3 after step 4.2 completes, and motion-control module moves to piezoelectricity fluorescent material shower nozzle above LED chip to be coated by control xyz axle motion platform;
4.4 after step 4.3 completes, use the controling parameters that step 4.1 calculates, coating control module and motion-control module print principle control piezoelectricity fluorescent material shower nozzle based on 3D in LED chip, apply described phosphor powder layer, specifically motion-control module moves according to 3D printing spraying path clustering state modulator xyz axle motion platform, applies control module simultaneously and in LED chip, prints required phosphor powder layer according to the controling parameters control piezoelectricity fluorescent material shower nozzle of the size of phosphor gel droplet and quantity;
4.5 judge whether to need to apply next LED chip, if needed, then forward step 4.3 to; If completed, then terminate.
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| CN201410387682.6A CN104226568A (en) | 2014-08-07 | 2014-08-07 | LED (Light emitting diode) fluorescent powder coating method and system based on 3D printing principle |
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Cited By (4)
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| CN104853528A (en) * | 2015-04-13 | 2015-08-19 | 常熟康尼格科技有限公司 | Method for packaging PCBA based on multidimensional printing |
| CN108962798A (en) * | 2018-08-03 | 2018-12-07 | 华南理工大学 | The full-automatic phosphor gel high-speed intelligent coating equipment of three primary colours RGB-LED and method |
| CN108970865A (en) * | 2018-07-18 | 2018-12-11 | 华南理工大学 | A kind of Multifunction fluorescent arogel automatic coating machine and control method |
| CN109262797A (en) * | 2018-09-19 | 2019-01-25 | 北京大学东莞光电研究院 | A kind of 3D printing method of integrated packaging light-emitting device |
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| CN103128041A (en) * | 2013-02-07 | 2013-06-05 | 华南理工大学 | Full automatic fluorescent powder coating process and device |
| CN203686924U (en) * | 2013-09-25 | 2014-07-02 | 南京博越环保科技有限公司 | LED (Light-Emitting Diode) integrally-encapsulated lamp |
| CN204052092U (en) * | 2014-08-07 | 2014-12-31 | 华南理工大学 | A kind of LED fluorescent powder application system printing principle based on 3D |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103128041A (en) * | 2013-02-07 | 2013-06-05 | 华南理工大学 | Full automatic fluorescent powder coating process and device |
| CN203686924U (en) * | 2013-09-25 | 2014-07-02 | 南京博越环保科技有限公司 | LED (Light-Emitting Diode) integrally-encapsulated lamp |
| CN204052092U (en) * | 2014-08-07 | 2014-12-31 | 华南理工大学 | A kind of LED fluorescent powder application system printing principle based on 3D |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104853528A (en) * | 2015-04-13 | 2015-08-19 | 常熟康尼格科技有限公司 | Method for packaging PCBA based on multidimensional printing |
| CN108970865A (en) * | 2018-07-18 | 2018-12-11 | 华南理工大学 | A kind of Multifunction fluorescent arogel automatic coating machine and control method |
| CN108962798A (en) * | 2018-08-03 | 2018-12-07 | 华南理工大学 | The full-automatic phosphor gel high-speed intelligent coating equipment of three primary colours RGB-LED and method |
| CN109262797A (en) * | 2018-09-19 | 2019-01-25 | 北京大学东莞光电研究院 | A kind of 3D printing method of integrated packaging light-emitting device |
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Application publication date: 20141224 |