CN113036020A - Lens vacuum packaging method - Google Patents
Lens vacuum packaging method Download PDFInfo
- Publication number
- CN113036020A CN113036020A CN202110247221.9A CN202110247221A CN113036020A CN 113036020 A CN113036020 A CN 113036020A CN 202110247221 A CN202110247221 A CN 202110247221A CN 113036020 A CN113036020 A CN 113036020A
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- lens
- preset time
- support
- curing
- glue
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
Abstract
The invention provides a lens vacuum packaging method, which comprises the following steps: a circle of glue is dispensed on the steps of the support, the lens is placed on the corresponding mounting position of the support, and then the support with the lens is placed in a vacuum eutectic furnace; starting the vacuum eutectic furnace, heating to a pre-curing temperature within first preset time according to a curing temperature curve of corresponding glue, maintaining second preset time, and performing short-time baking pre-curing; extracting the air in the cavity formed by the lens and the bracket; after the second preset time is finished, according to a curing temperature curve of the corresponding glue, within a third preset time, heating to a long-time baking curing temperature, and maintaining for a fourth preset time, and performing long-time baking curing; and after the long-time baking solidification is finished, cooling to room temperature. According to the lens vacuum packaging method provided by the invention, the lens and the support are tightly bonded together through the glue, the inside of the cavity is vacuumized, the lens is tightly pressed on the support through external pressure, and the connection stability of the lens and the support is improved.
Description
Technical Field
The invention relates to the technical field of LED lens packaging, in particular to a lens vacuum packaging method.
Background
UV LEDs, i.e., ultraviolet light emitting diodes, are one type of LED. At present, the UV LED package needs to be covered with a lens such as quartz or sapphire on the surface, and glue bonding or laser welding is generally used.
The laser welding process is complex, the requirement on the precision of equipment is high, and the equipment cost is high. After the glue is bonded on the coated glue, the coated glue enters an oven to be dried, so that the glue is cured, but poor bonding is easily caused, and the lens is easy to fall off; glue is easy to be dispensed unevenly, and a gap is easy to be left between the lens and the bracket after curing, so that the sealing property is poor; moreover, the heat productivity of the UV LED is large, the temperature in the cavity of the bracket rises, the air in the cavity expands, and the lens is easy to eject out, so that the lens is easy to fall off.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the disadvantages of the prior art, and to provide a method for vacuum packaging of a lens, in which a glue is heated, cured and cooled, so that the lens and a bracket are tightly bonded together, and a cavity formed by the lens and the bracket is evacuated, and the lens is tightly pressed on the bracket by external pressure, and the connection stability between the lens and the bracket is increased by two ways of glue and atmospheric pressure. And the cavity is internally vacuumized, air is not available, air expansion cannot occur under the condition that the UV LED generates heat, and the lens is ejected to drop, so that the connection stability of the lens and the support is improved.
In order to achieve the above object, the present invention provides a lens vacuum packaging method, comprising the steps of:
A. a circle of glue is dispensed on the steps of the support, the lens is placed on the corresponding mounting position of the support, and then the support with the lens is placed in a vacuum eutectic furnace;
B. starting the vacuum eutectic furnace, heating to a pre-curing temperature within first preset time according to a curing temperature curve of corresponding glue, maintaining second preset time, and performing short-time baking pre-curing; extracting the air in the cavity formed by the lens and the bracket;
C. after the second preset time is finished, according to a curing temperature curve of the corresponding glue, within a third preset time, heating to a long-time baking curing temperature, and maintaining for a fourth preset time, and performing long-time baking curing;
D. and after the long-time baking solidification is finished, cooling to room temperature.
Further, in the step B, air in a cavity formed by the lens and the support is pumped out by the vacuum eutectic furnace, so that the vacuum degree is smaller than 1000 pa.
Further, in step B, the extraction of the air inside the cavity formed by the lens and the holder is performed simultaneously when the temperature rises from the start of the short bake pre-cure.
Further, in step D, after the long-time baking solidification is finished, the temperature is slowly reduced to the pre-solidification temperature within a fifth preset time, and then the temperature is naturally cooled to the room temperature.
Further, the specific duration of the first preset time, the second preset time, the third preset time, the fourth preset time and the fifth preset time is determined according to a curing temperature curve of the corresponding glue and the characteristics of the corresponding glue.
Further, the short-bake pre-curing and the long-bake curing are continuously performed in the same vacuum eutectic furnace.
According to the vacuum packaging method for the lens, provided by the invention, the lens and the support are tightly bonded together by heating, curing and cooling the glue, the inside of a cavity formed by the lens and the support is vacuumized, the lens is tightly pressed on the support by external pressure, and the connection stability between the lens and the support is improved by two modes of glue and atmospheric pressure. And the cavity is internally vacuumized, air is not available, air expansion cannot occur under the condition that the UV LED generates heat, and the lens is ejected to drop, so that the connection stability of the lens and the support is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following further describes the invention in detail according to the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a schematic overall structure diagram provided by a first embodiment of the product of the invention;
fig. 2 is a schematic overall structure diagram provided by a second embodiment of the product of the invention.
The reference numerals in the drawings are explained below.
100. A lens; 200. and (4) a bracket.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "front", "upper", "lower", "left", "right", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 and 2, a lens vacuum packaging method includes the following steps:
A. a circle of glue is dispensed on the steps of the support 200, the lens 100 is placed on the corresponding mounting position of the support, and then the support 200 with the lens 100 is placed in a vacuum eutectic furnace. The lens 100 generally has a containing space in the middle for containing the LED lamp beads, the lens 100 is convex or planar, when the edge of the lens 100 contacts the support 200, a cavity is formed in the middle, and the lens 100 is adhered to the surface of the support 200 primarily through glue.
B. Starting the vacuum eutectic furnace, heating the vacuum eutectic furnace to a pre-curing temperature within first preset time according to a curing temperature curve corresponding to the glue, maintaining the second preset time, and performing short-time baking pre-curing on the glue; the air inside the cavity formed by the lens 100 and the holder 200 is extracted. The short baking pre-curing enables the solvent in the glue to volatilize at a lower temperature first, so that the glue loses fluidity, but the curing cross-linking reaction does not occur, and gaps exist among the glue, so that the air in the cavity can be pumped out for a sufficient time.
C. After the second preset time is finished, according to the curing temperature curve of the corresponding glue, the temperature is increased to the long-time baking curing temperature within the third preset time, and the long-time baking curing is carried out after the fourth preset time is maintained. The long-time baking curing temperature is higher than the pre-curing temperature, so that the glue is cured and cross-linked, and the lens 100 and the bracket 200 are tightly adhered together.
D. And after the long-time baking solidification is finished, cooling to room temperature.
In this embodiment, the glue is heated, cured and cooled to tightly adhere the lens 100 and the bracket 200 together, the cavity formed by the lens 100 and the bracket 200 is evacuated, the lens 100 is tightly pressed on the bracket 200 by external pressure, and the connection stability between the lens 100 and the bracket 200 is increased by two modes of glue and atmospheric pressure. And the interior of the cavity is vacuumized, no air exists, and air expansion cannot occur under the condition that the UV LED generates heat, so that the lens 100 is jacked down, and the connection stability of the lens 100 and the support 200 is improved.
Specifically, in the step B, the vacuum eutectic furnace extracts air in the cavity formed by the lens 100 and the support 200, so that the vacuum degree value in the cavity is smaller than 1000pa, that is, the cavity does not need to be completely vacuumized, thereby reducing the processing difficulty.
Specifically, in step B, the extraction of the air inside the cavity formed by the lens 100 and the holder 200 is performed simultaneously when the temperature rises from the start of the short bake pre-cure. Air is extracted while the temperature is raised, and when the temperature reaches the pre-curing temperature, the air extraction in the cavity is also completed simultaneously.
Specifically, in the step D, after the long-time baking solidification is finished, the temperature is slowly reduced to the pre-solidification temperature within a fifth preset time, and then the temperature is naturally cooled to the room temperature. The glue can be cured more completely by slow cooling.
The short-baking pre-curing and the long-baking curing are continuously carried out in the same vacuum eutectic furnace. The process of transferring the product from the pre-curing short oven to the long oven is omitted, the production efficiency and the production stability are improved, and uncertain factors influencing the product quality are reduced.
Specifically, the specific duration of the first preset time, the second preset time, the third preset time, the fourth preset time and the fifth preset time is determined according to the curing temperature curve of the corresponding glue and the characteristics of the corresponding glue.
In this embodiment, silver paste is used as an example, and is the most commonly used glue in the art.
A. The lens 100 with the edge coated with the silver paste is placed on the corresponding mounting position of the holder 200, and then the holder 200 with the lens 100 mounted thereon is placed in a vacuum eutectic furnace. The lens 100 generally has a containing space in the middle for containing the LED lamp beads, the lens 100 is convex or planar, when the edge of the lens 100 contacts the support 200, a cavity is formed in the middle, and the lens 100 is primarily adhered to the surface of the support 200 through silver paste.
B. Starting the vacuum eutectic furnace, heating the vacuum eutectic furnace to the pre-curing temperature of 80 ℃ within 5 minutes of the first preset time according to the curing temperature curve of the silver colloid, maintaining the second preset time for 1 hour, and performing short baking pre-curing on the glue; the air inside the cavity formed by the lens 100 and the holder 200 is extracted. The short baking pre-curing enables the internal solvent of the silver colloid to volatilize at a lower temperature first, so that the silver colloid loses fluidity, but the curing crosslinking reaction does not occur, and gaps exist among the silver colloids, so that the air in the cavity can be pumped out for a sufficient time.
C. After the second preset time is finished, according to the curing temperature curve corresponding to the silver colloid, within 10 minutes of the third preset time, the temperature is increased to 160-180 ℃ of the long-time baking curing temperature, and the fourth preset time is maintained for 3 hours, so that the long-time baking curing is carried out. The long-time baking curing temperature is higher than the pre-curing temperature, so that the silver colloid generates a curing and crosslinking reaction, and the silver colloid is cured, so that the lens 100 and the bracket 200 are tightly adhered together.
D. And after the long-time baking solidification is finished, cooling to room temperature.
Through heating the silver colloid for solidification and cooling again, make lens 100 and support 200 closely adhere together to lens 100 and support 200 constitute the inside evacuation of cavity, and external pressure closely presses lens 100 on support 200, through silver colloid and atmospheric pressure two kinds of modes, increases the stability of being connected between lens 100 and the support 200. And the interior of the cavity is vacuumized, no air exists, and air expansion cannot occur under the condition that the UV LED generates heat, so that the lens 100 is jacked down, and the connection stability of the lens 100 and the support 200 is improved.
Specifically, in the step B, the vacuum eutectic furnace extracts air in the cavity formed by the lens 100 and the support 200, so that the vacuum degree value in the cavity is smaller than 1000pa, that is, the cavity does not need to be completely vacuumized, thereby reducing the processing difficulty.
Specifically, in step B, the extraction of the air inside the cavity formed by the lens 100 and the holder 200 is performed simultaneously when the temperature rises from the start of the short bake pre-cure. Air is extracted while the temperature is raised, and when the temperature reaches the pre-curing temperature, the air extraction in the cavity is also completed simultaneously.
Specifically, in the step D, after the long-time baking solidification is finished, the temperature is slowly reduced to the pre-solidification temperature of 80 ℃ within 15 minutes of a fifth preset time, and then the product is naturally cooled to the room temperature. The glue can be cured more completely by slow cooling.
The short-baking pre-curing and the long-baking curing are continuously carried out in the same vacuum eutectic furnace. The process of transferring the product from the pre-curing short oven to the long oven is omitted, the production efficiency and the production stability are improved, and uncertain factors influencing the product quality are reduced.
It should be noted that, in this embodiment, the first preset time, the second preset time, the third preset time, the fourth preset time, the fifth preset time, the preset curing temperature, and the long-time baking curing temperature are all determined according to different types of glue. The silver glue example given in this embodiment is merely an example of the glue, and cannot be considered as a limitation on the type of the glue.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. A lens vacuum packaging method is characterized by comprising the following steps:
A. a circle of glue is dispensed on the steps of the support, the lens is placed on the corresponding mounting position of the support, and then the support with the lens is placed in a vacuum eutectic furnace;
B. starting the vacuum eutectic furnace, heating to a pre-curing temperature within first preset time according to a curing temperature curve of corresponding glue, maintaining second preset time, and performing short-time baking pre-curing; extracting the air in the cavity formed by the lens and the bracket;
C. after the second preset time is finished, according to a curing temperature curve of the corresponding glue, within a third preset time, heating to a long-time baking curing temperature, and maintaining for a fourth preset time, and performing long-time baking curing;
D. and after the long-time baking solidification is finished, cooling to room temperature.
2. The method for vacuum packaging of claim 1, wherein in step B, the vacuum eutectic furnace evacuates air from inside the cavity formed by the lens and the support to a vacuum degree of less than 1000 pa.
3. The method of claim 1, wherein in step B, the air inside the cavity formed by the lens and the support is extracted synchronously with the temperature rise of the short bake pre-cure.
4. The method of claim 1, wherein in step D, after the curing by the long bake is completed, the temperature is slowly decreased to the pre-curing temperature within a fifth predetermined time, and then the glass is naturally cooled to room temperature.
5. The method for vacuum packaging lens as claimed in claim 4, wherein the specific duration of the first preset time, the second preset time, the third preset time, the fourth preset time and the fifth preset time is determined according to the curing temperature curve of the corresponding glue and the characteristics of the corresponding glue.
6. The method of claim 1, wherein the short bake pre-cure and the long bake cure are performed continuously in the same vacuum eutectic furnace.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020223872053 | 2020-10-23 | ||
| CN202022387205 | 2020-10-23 |
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| CN113036020A true CN113036020A (en) | 2021-06-25 |
| CN113036020B CN113036020B (en) | 2022-08-02 |
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| CN202110247221.9A Active CN113036020B (en) | 2020-10-23 | 2021-03-05 | Lens vacuum packaging method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113578674A (en) * | 2021-08-24 | 2021-11-02 | 安徽光智科技有限公司 | Automatic dispensing system and dispensing method |
| CN114274427A (en) * | 2021-12-23 | 2022-04-05 | 芜湖荣基密封系统有限公司 | Uniform baking device, method and system for sealing element |
| CN116422555A (en) * | 2023-04-10 | 2023-07-14 | 江苏运鸿辉电子科技有限公司 | Control system for improving curing strength of LED lamp lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113036020B (en) | 2022-08-02 |
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