CN218498092U - Ceramic packaging structure capable of improving UV reflectivity - Google Patents
Ceramic packaging structure capable of improving UV reflectivity Download PDFInfo
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- CN218498092U CN218498092U CN202222373457.XU CN202222373457U CN218498092U CN 218498092 U CN218498092 U CN 218498092U CN 202222373457 U CN202222373457 U CN 202222373457U CN 218498092 U CN218498092 U CN 218498092U
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Abstract
The utility model discloses a ceramic packaging structure capable of improving UV reflectivity, which comprises a body and a light-transmitting cover plate; the body comprises a ceramic base layer, a metal dam and a front bonding pad; the metal dam is arranged on the upper surface of the ceramic substrate and forms an encapsulation cavity with an upward opening; through the internal diameter design with the encapsulation chamber for from lower to upper crescent, in order to do benefit to the light-emitting, and the cooperation has the mirror surface silvered film at the inside wall shaping cover of encapsulation chamber, can effectively improve the UV reflectivity, simultaneously through having sealed glue in the annular caulking groove, and the cooperation has glass glue and waterproof material by interior toward packing in proper order outward in the annular space, multiple waterproof sealing is fixed has been realized, product structure is firm more, the printing opacity apron is difficult for droing, the gas tightness is better, can protect UV wafer and mirror surface silvered film better, thereby make the UV reflectivity of this product can keep at higher level for a long time, satisfy the needs of using.
Description
Technical Field
The utility model belongs to the technical field of the device encapsulation technique and specifically relates to indicate a can improve ceramic packaging structure of UV reflectivity.
Background
The ultraviolet light emitting diode (UV-LED) has the advantages of energy conservation, environmental protection, long service life, small volume, controllable wavelength and the like. The light-emitting wavelength of the deep ultraviolet LED is less than 300nm, and the deep ultraviolet LED can be applied to the fields of sterilization, disinfection, water purification, biochemical detection and the like.
UV-LEDs are typically packaged using a ceramic substrate, which means that copper foil is bonded directly to alumina (Al) at high temperature 2 O 3 ) Or a special process plate on the surface (single or double side) of an aluminum nitride (AlN) ceramic substrate. The manufactured ultrathin composite substrate has excellent electrical insulation performance, high heat conduction characteristic, excellent soft solderability and high adhesion strength, can be etched into various patterns like a PCB (printed circuit board), and has great current carrying capacity. Therefore, the ceramic substrate becomes a basic material of a high-power electronic circuit structure technology and an interconnection technology, and can be widely applied to packaging of UV-LEDs.
In order to facilitate packaging of the UV wafer, metal dams are arranged on the ceramic substrate, a packaging cavity is formed by the metal dams, the UV wafer is packaged in the packaging cavity through a light-transmitting cover plate, in order to improve reflectivity, aluminum is plated on the metal dams in the conventional method, however, the reflectivity of aluminum is still not high, the use requirement cannot be met, in addition, the light-transmitting cover plate directly abuts against the top surface of the metal dams to be sealed and fixed, the air tightness is poor, and a plating layer and the UV wafer in the packaging cavity cannot be well protected. Therefore, there is a need to develop a solution to the above problems.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a ceramic package structure capable of increasing the UV reflectivity, which can effectively solve the problem of low reflectivity of the existing ceramic package structure.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a ceramic packaging structure capable of improving UV reflectivity comprises a body and a light-transmitting cover plate; the body comprises a ceramic base layer, a metal dam and a front bonding pad; the metal dam is arranged on the upper surface of the ceramic base layer and forms an encapsulation cavity with an upward opening in an enclosing mode, and the front bonding pad is arranged on the upper surface of the ceramic base layer and is positioned in the encapsulation cavity; the light-transmitting cover plate covers the opening of the packaging cavity; the internal diameter of this encapsulation chamber is crescent from bottom to top to do benefit to the light-emitting, the inside wall shaping in encapsulation chamber covers has the mirror surface silvered film, in order to improve the UV reflectivity, and the concave annular caulking groove that is equipped with in opening edge in encapsulation chamber, the lower part of this printing opacity apron inlays in the annular caulking groove, sealed fixed through sealed glue between the periphery bottom surface of printing opacity apron and the annular caulking groove, be formed with annular space between the top surface of the upper portion metal dam of this printing opacity apron, it has glass glue and waterproof material to fill in proper order by inside to outside in this annular space, this waterproof material covers glass and glues.
As a preferred scheme, the ceramic base layers are formed by a plurality of layers which are overlapped up and down, the metal box dam and the front bonding pads are formed on the upper surface of the uppermost ceramic base layer, a conductive circuit is clamped between two adjacent ceramic base layers up and down, and the front bonding pads are respectively in conductive connection with the corresponding conductive circuits through corresponding via holes so as to carry out high-density packaging.
As a preferred scheme, the metal box dam is formed and fixed on the upper surface of the ceramic base layer on the uppermost layer in an electroplating thickening mode, and the structure is stable.
Preferably, the edge of the inner side edge of the annular caulking groove protrudes upwards to form a baffle ring.
As a preferred scheme, the bottom surface of annular caulking groove is equipped with a plurality of first annular grooves in a concave way, and these a plurality of first annular grooves are by interior toward outer interval setting, and the periphery bottom surface of this printing opacity apron is equipped with a plurality of second annular grooves in a concave way, and these a plurality of second annular grooves are by interior toward outer interval setting, and a plurality of first annular grooves and a plurality of second annular grooves are filled to aforementioned sealed glue to extend the aqueous vapor stroke, realize better gas tightness.
Preferably, the waterproof material is ultraviolet glue, the coating range of the waterproof material is larger than that of the glass glue, the waterproof material completely covers the outer surface of the glass glue, and the waterproof performance is better.
As a preferred scheme, the ultraviolet glue is acrylate, so that the bonding is stable, and the air tightness is better.
Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly, can know by above-mentioned technical scheme:
through the internal diameter design with the encapsulation chamber for from lower to upper crescent, in order to do benefit to the light-emitting, and the cooperation has the mirror surface silvered film at the inside wall shaping cover of encapsulation chamber, can effectively improve the UV reflectivity, simultaneously through having sealed glue in the annular caulking groove, and the cooperation has glass glue and waterproof material by interior toward packing in proper order outward in the annular space, multiple waterproof sealing is fixed has been realized, product structure is firm more, the printing opacity apron is difficult for droing, the gas tightness is better, can protect UV wafer and mirror surface silvered film better, thereby make the UV reflectivity of this product can keep at higher level for a long time, satisfy the needs of using.
To illustrate the structural features and functions of the present invention more clearly, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a cross-sectional view of a preferred embodiment of the present invention.
Description of the figures:
10. body 11, ceramic substrate
12. Metal dam 13 and front bonding pad
14. Mirror-surface silver-plated layer 15 and conductive circuit
16. Via hole 101 and packaging cavity
102. Annular caulking groove 103 and baffle ring
104. First annular groove 20, light-transmitting cover plate
21. Annular space 22, second annular groove
31. Sealant 32 and glass cement
33. Waterproof material 40, UV wafer.
Detailed Description
Referring to fig. 1, a specific structure of a preferred embodiment of the present invention is shown, which includes a main body 10 and a transparent cover plate 20.
The body 10 comprises a ceramic substrate 11, a metal dam 12 and a front pad 13; the metal dam 12 is arranged on the upper surface of the ceramic substrate 11 and is surrounded to form an encapsulation cavity 101 with an upward opening, and the front pad 13 is arranged on the upper surface of the ceramic substrate 11 and is positioned in the encapsulation cavity 101; the inner diameter of the packaging cavity 101 is gradually increased from bottom to top so as to be beneficial to light emitting, the inner side wall of the packaging cavity 101 is covered with a mirror silver coating 14 in a forming mode so as to improve the UV reflectivity, and an annular caulking groove 102 is concavely arranged on the opening edge of the packaging cavity 101. The inner edge of the annular caulking groove 102 protrudes upward to form a retaining ring 103, the bottom surface of the annular caulking groove 102 is provided with a plurality of first annular grooves 104 in a concave manner, and the plurality of first annular grooves 104 are arranged at intervals from inside to outside. The ceramic base layers 11 are stacked up and down, the metal box dams 12 and the front bonding pads 13 are formed on the upper surface of the ceramic base layer 11 on the uppermost layer, conductive circuits 15 are clamped between two adjacent upper and lower ceramic base layers 11, and the front bonding pads 13 are in conductive connection with the corresponding conductive circuits 15 through corresponding via holes 16 respectively so as to perform high-density packaging. The metal box dam 12 is formed and fixed on the upper surface of the ceramic substrate 11 of the uppermost layer by electroplating and thickening.
The transparent cover plate 20 covers the opening of the package cavity 101, the lower portion of the transparent cover plate 20 is embedded in the annular caulking groove 102, so as to fix the transparent cover plate 20 better, the peripheral bottom surface of the transparent cover plate 20 is fixed to the annular caulking groove 102 in a sealing manner through the sealant 31, the baffle ring 103 blocks the sealant 31, the sealant 31 is prevented from entering the package cavity 101, an annular space 21 is formed between the top surfaces of the upper metal dams 12 of the transparent cover plate 20, the annular space 21 is filled with the glass cement 32 and the waterproof material 33 from inside to outside in sequence, and the waterproof material 33 covers the glass cement 32, so as to realize better air tightness. In this embodiment, the transparent cover plate 20 is made of quartz glass, a plurality of second annular grooves 22 are concavely formed on the bottom surface of the periphery of the transparent cover plate 20, the plurality of second annular grooves 22 are arranged from inside to outside at intervals, and the sealant 31 fills the plurality of first annular grooves 104 and the plurality of second annular grooves 22, so as to extend the water-gas stroke and achieve better airtightness. The waterproof material 33 is ultraviolet glue, the coating range of the waterproof material 33 is larger than that of the glass glue 32, the outer surface of the glass glue 32 is completely covered, and the ultraviolet glue is acrylate, so that the bonding is stable, and the air tightness is better.
During packaging, firstly, the UV wafer 40 is placed in the packaging cavity 101 and is abutted against the front surface bonding pad 13 for fixing, and then the UV wafer 40 is welded and conducted with the corresponding front surface bonding pad 13; then, the sealant 31 is injected into the annular caulking groove 102, then the transparent cover plate 20 is embedded into the annular caulking groove 102 from top to bottom, and after the transparent cover plate is embedded in place, the glass cement 32 and the waterproof material 32 are sequentially filled into the annular space 21 from inside to outside, and the sealant 31, the glass cement 32 and the waterproof material 33 which are arranged in a matching manner realize multiple sealing and fixing, so that the structure is more stable, moisture is effectively prevented from entering the packaging cavity 101, and the UV wafer 40 and the mirror silver-plated layer 14 are better protected.
When the product is used, after the product is powered on, the UV wafer 40 generates UV light, most of the UV light is emitted outwards through the light-transmitting cover plate 20 under the emission coordination effect of the mirror-surface silver-plated layer 14, and the reflectivity of the mirror-surface silver-plated layer 14 can reach more than 95%.
The utility model discloses a design focus lies in: through the internal diameter design with the encapsulation chamber for from lower to upper crescent, in order to do benefit to the light-emitting, and the cooperation has the mirror surface silvered film at the inside wall shaping cover of encapsulation chamber, can effectively improve the UV reflectivity, simultaneously through having sealed glue in the annular caulking groove, and the cooperation has glass glue and waterproof material by interior toward packing in proper order outward in the annular space, multiple waterproof sealing is fixed has been realized, product structure is firm more, the printing opacity apron is difficult for droing, the gas tightness is better, can protect UV wafer and mirror surface silvered film better, thereby make the UV reflectivity of this product can keep at higher level for a long time, satisfy the needs of using.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any slight modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (7)
1. A ceramic packaging structure capable of improving UV reflectivity comprises a body and a light-transmitting cover plate; the body comprises a ceramic base layer, a metal dam and a front bonding pad; the metal dam is arranged on the upper surface of the ceramic base layer and forms an encapsulation cavity with an upward opening in an enclosing mode, and the front bonding pad is arranged on the upper surface of the ceramic base layer and is positioned in the encapsulation cavity; the light-transmitting cover plate covers the opening of the packaging cavity; the method is characterized in that: the internal diameter of this encapsulation chamber is crescent from bottom to top, the inside wall shaping cover of encapsulation chamber has the mirror surface silvered film, and the concave annular caulking groove that is equipped with in opening edge of encapsulation chamber, inlay in the annular caulking groove the lower part of this printing opacity apron, sealed fixed through sealed glue between the periphery bottom surface of printing opacity apron and the annular caulking groove, be formed with annular space between the top surface of the upper portion metal box dam of this printing opacity apron, it has glass glue and waterproof material to fill in proper order by inside to outside in this annular space, this waterproof material covers glass and glues.
2. The ceramic package structure capable of improving UV reflectivity according to claim 1, wherein: the ceramic base layer is a plurality of layers which are arranged in an up-down overlapping mode, the metal box dam and the front bonding pads are formed on the upper surface of the ceramic base layer on the uppermost layer, conductive circuits are clamped between two adjacent upper and lower ceramic base layers, and the front bonding pads are in conductive connection with the corresponding conductive circuits through the corresponding conductive holes respectively.
3. The ceramic package structure capable of improving UV reflectivity according to claim 2, wherein: the metal box dam is formed and fixed on the upper surface of the ceramic base layer on the uppermost layer in an electroplating thickening mode.
4. The ceramic package structure capable of improving UV reflectivity according to claim 1, wherein: the edge of the inner side edge of the annular caulking groove protrudes upwards to form a retaining ring.
5. The ceramic package structure capable of improving UV reflectivity of claim 1, wherein: the concave a plurality of first annular grooves that are equipped with in bottom surface of annular caulking groove, these a plurality of first annular grooves are by interior toward outer interval setting, the concave a plurality of second annular grooves that are equipped with in periphery bottom surface of this printing opacity apron, these a plurality of second annular grooves are by interior toward outer interval setting, a plurality of first annular grooves and a plurality of second annular grooves of sealed packing of aforesaid.
6. The ceramic package structure capable of improving UV reflectivity according to claim 1, wherein: the waterproof material is ultraviolet glue, the coating range of the waterproof material is larger than that of the glass glue, and the waterproof material completely covers the outer surface of the glass glue.
7. The ceramic package structure capable of improving UV reflectivity according to claim 6, wherein: the ultraviolet glue is acrylate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222373457.XU CN218498092U (en) | 2022-09-07 | 2022-09-07 | Ceramic packaging structure capable of improving UV reflectivity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222373457.XU CN218498092U (en) | 2022-09-07 | 2022-09-07 | Ceramic packaging structure capable of improving UV reflectivity |
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| CN218498092U true CN218498092U (en) | 2023-02-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024046441A1 (en) * | 2022-08-31 | 2024-03-07 | 惠州市聚飞光电有限公司 | Packaging structure, led device, and packaging method |
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- 2022-09-07 CN CN202222373457.XU patent/CN218498092U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024046441A1 (en) * | 2022-08-31 | 2024-03-07 | 惠州市聚飞光电有限公司 | Packaging structure, led device, and packaging method |
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