CN113421957A - Flexible belt for COB (chip on board) flip-chip and flip-chip process thereof - Google Patents
Flexible belt for COB (chip on board) flip-chip and flip-chip process thereof Download PDFInfo
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- CN113421957A CN113421957A CN202110674417.6A CN202110674417A CN113421957A CN 113421957 A CN113421957 A CN 113421957A CN 202110674417 A CN202110674417 A CN 202110674417A CN 113421957 A CN113421957 A CN 113421957A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers 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 having potential barriers 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 having potential barriers 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 having potential barriers 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
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
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Abstract
The invention discloses a flexible belt for COB (chip on Board) inverted installation and an inverted installation process thereof, belonging to the technical field of COB (chip on Board), wherein the invention can simultaneously improve the heat dissipation and the strength of a flexible belt body by embedding a strip-shaped heat-conducting oil bag in the flexible belt body, and push a hardening anti-rolling ball in the strip-shaped heat-conducting oil bag into a semi-hard bag in a proper posture by the deformation and extrusion of the strip-shaped heat-conducting oil bag in a manner of matching with the semi-hard bag when the flexible belt body is curled, the hardening anti-rolling ball is extruded when moving into the semi-hard bag, so as to trigger the extension action of the semi-hard bag, extend an anti-rolling entanglement wire from the interior, and crossly entangle with the anti-rolling entanglement wire on the adjacent semi-hard bag, thereby improving the overall strength of the semi-hard bag, preventing the flexible belt body from further curling, effectively ensuring that an inverted chip corresponding to the semi-hard bag is always in reasonable structural stability, instability and even damage are not easy to occur, and the safety and the stability of COB inversion are obviously improved.
Description
Technical Field
The invention relates to the technical field of COB (chip on board), in particular to a flexible belt for COB flip-chip and a flip-chip process thereof.
Background
The COB light source is a high-light-efficiency integrated surface light source technology for directly attaching an LED chip to a mirror surface metal substrate with high light reflection rate, the technology eliminates the concept of a bracket, and has no electroless plating, reflow soldering and no surface mounting process, so that the process is reduced by about one third, and the cost is also saved by one third.
The COB light source can be simply understood as a high-power integrated surface light source, and the light emitting area and the overall dimension of the light source can be designed according to the product overall structure.
The COB flip-chip method comprises the steps of covering a silicon chip mounting point on the surface of a substrate with heat-conducting epoxy resin, directly mounting the silicon chip on the surface of the substrate, carrying out heat treatment until the silicon chip is firmly fixed on the substrate, and then directly establishing electrical connection between the silicon chip and the substrate by using a wire bonding method. For just adorning COB encapsulation, flip-chip COB structure is simpler LED resistant higher current, and it is better that manufacturing process simplifies the heat dissipation of no gold thread, and stability is high, and RGB mixes light effectually.
However, when the flip-chip COB is applied to the flexible belt, because the flexible belt needs to curl to a certain extent in the practical application process, thereby easily causing interference to the structural stability of the COB light source on the flexible belt, in case when excessive curling appears, not only easily causing the structural stability of the COB light source to deteriorate or even fall off, but also having the risk of damaging the COB light source.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a flexible belt for COB (chip on Board) inversion and an inversion process thereof, which can simultaneously improve the heat dissipation and the strength of the flexible belt body in a mode of embedding a strip-shaped heat-conducting oil bag in the flexible belt body, and push a hardening anti-rolling ball in the strip-shaped heat-conducting oil bag into a semi-hard bag in a proper posture through the deformation extrusion of the strip-shaped heat-conducting oil bag in a mode of matching with the semi-hard bag when the flexible belt body is curled, so that the hardening anti-rolling ball is extruded when moving into the semi-hard bag, thereby triggering the extension action of the semi-hard bag, extending an anti-rolling and winding wire from the interior, and interlacing and winding with the anti-rolling and winding wire on the adjacent semi-hard bag, improving the overall strength of the semi-hard bag, preventing the flexible belt body from further curling, and effectively ensuring that an inverted chip corresponding to the semi-hard bag is always in reasonable structural stability, instability and even damage are not easy to occur, and the safety and the stability of COB inversion are obviously improved.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A flexible belt for COB flip-chip comprises a flexible belt body, wherein the upper end of the flexible belt body is connected with a circuit layer, the circuit layer is connected with a plurality of flip chips which are evenly distributed, the flexible belt body is embedded and connected with a strip-shaped heat conduction oil bag, the strip-shaped heat conduction oil bag is filled with heat conduction oil, one end of the strip-shaped heat conduction oil bag, which is close to the flip chip, is connected with a plurality of semi-hard bags which are uniformly distributed, the semi-hard bag corresponds to the flip chip, a plurality of heat conducting wires which are uniformly distributed are connected between the semi-hard bag and the circuit layer, the semi-hard bag comprises a positioning sleeve and a hard changing bag, and the hard change bag is embedded in the center of the positioning sleeve, an adsorption magnetic block is embedded and connected in the hard change bag, a shape control composite film is connected between the hard change bag and the strip-shaped heat conduction oil bag, the strip-shaped heat conduction oil bag is provided with a plurality of penetration holes corresponding to the shape control composite membrane, and the heat conduction oil is filled with a plurality of hardening anti-rolling balls.
Further, accuse shape complex film includes elasticity basement membrane and magnetic screen top layer, the magnetic screen top layer covers in elasticity basement membrane surface, a plurality of evenly distributed's dilatation joint has all been seted up on elasticity basement membrane and magnetic screen top layer, and the dilatation joint prevents with promoting hard that the roll ball matches, the magnetic field shielding effect to adsorbing the magnetic path is played on the magnetic screen top layer under the normal condition, avoid preventing the roll ball to lead to the fact the interference and influence the distribution to promoting hard in the strip heat conduction oil pocket, the synchronous deformation of time control shape complex film is curled when the flexible belt body curls, the roll ball is prevented to promoting hard in the strip heat conduction oil pocket receives the extrusion, then the dilatation joint opens and supplies to promote hard to prevent that the roll ball passes through, the magnetic attraction effect of adsorbing the magnetic path at this moment can act on and prevent rolling up the ball hard, can force to promote hard to prevent rolling up the posture that the ball adjustment entered into in the hard bag, and then ensure subsequent hindrance effect.
Furthermore, the position sleeve is made of hard heat conduction materials, the hard capsule and the elastic base membrane are made of elastic heat conduction materials, the position sleeve plays a role in shaping the hard capsule on one hand, the heat conduction oil is contained in the position sleeve with a relatively unchanged space all the time, the hard anti-rolling ball is promoted, therefore, the strength of the hard capsule is improved under the intensive distribution of the hard anti-rolling ball, the strength of the whole flexible belt body is improved by matching with the position sleeve, the flexible belt body is not prone to being continuously rolled, and on the other hand, the position sleeve and the hard capsule can utilize excellent heat conduction to improve the heat dissipation effect of the flexible belt body.
Furthermore, it prevents roll ball including pneumatic hemisphere, unsteady hemisphere, many spinal branchs pole and atmospheric pressure cover to urge hard, bracing piece and atmospheric pressure cover are all connected between pneumatic hemisphere and unsteady hemisphere, and the atmospheric pressure cover is located the outside of bracing piece, and the bracing piece plays the fixed action to pneumatic hemisphere and unsteady hemisphere, and when urging hard to prevent roll ball and remove to the middle part region back to hard in the bag, accuse shape complex film acts on the atmospheric pressure and sheathes in and forces inwards to compress to utilize the change of atmospheric pressure to trigger the extension action on the pneumatic hemisphere
Further, pneumatic hemisphere and the hemisphere symmetric distribution that floats, and the internal surface of pneumatic hemisphere and the hemisphere that floats is the cambered surface that mutual arch is close to, pneumatic hemisphere adopts ferromagnetic material to make, the hemisphere that floats adopts light material to make, and pneumatic hemisphere can enter into hard change bag with the exact gesture under the magnetic attraction effect of adsorbing the magnetic path, and the hemisphere that floats then can guarantee to urge hard to prevent roll up the ball whole and have certain buoyancy, keeps it to suspend in the conduction oil, is favorable to its spatial distribution in the conduction oil, and the cambered surface characteristic of pneumatic hemisphere and the hemisphere that floats not only does benefit to accuse shape complex film and compresses the atmospheric pressure cover, also easily withdraws from simultaneously and resets.
Further, the last spherical air cavity of having seted up of pneumatic hemisphere, and spherical air cavity is linked together with bar heat conduction oil bag, spherical air cavity in-connection has the inflation air film, inflation air film is kept away from unsteady hemisphere one end and is connected with many and prevents rolling up entangling the silk, set up on the pneumatic hemisphere with prevent rolling up entangling the extension hole that silk phase-match, receive the extrusion back at the atmospheric pressure cover, its inside air can enter into the spherical air cavity and aerify the inflation air film, forces its inflation then promote to prevent rolling up entangling the silk and extend from extending downthehole outside.
Further, prevent rolling up entangle silk including interior adaptation silk, outer extension silk and limit to the acting as go-between, interior adaptation silk is connected with outer extension silk symmetry, and outer extension silk is connected with inflation air film through interior adaptation silk, limit to the acting as go-between is connected between interior adaptation silk and outer extension silk, and limit to the acting as go-between is located one side that interior adaptation silk and outer extension silk kept away from the hemisphere that floats, and interior adaptation silk utilizes high strength characteristic to hinder the further curling of flexible area body, and outer extension silk can utilize the characteristic to satisfy the self-adaptation after the inflation air film inflation and extend, and limit to the acting as go-between then plays the limit to the crooked direction of preventing rolling up entangle silk, forces it to promote hard to prevent that the ball from withdrawing from the direction bending, and when the flexible area body curls, because the limit is to the inextensible characteristic, consequently can prevent rolling up entangle silk and take place bending deformation.
Furthermore, the inner adaptive wire is made of elastic materials, the outer extending wire is made of hard materials, and the direction-limiting pull wire is made of non-elastic flexible materials.
Further, mutually contact between the half hard bag, bar heat conduction oil bag one end is kept away from to the position sleeve is the cambered surface, hard bag and flip chip phase-match, half hard bag not only can wholly improve the intensity and the thermal diffusivity of flexible area body, when curling in the contact area simultaneously, the cambered surface can conflict each other and prevent further curling after curling to a certain degree, can protect the flexible area body equally.
The flip-chip process of the flexible belt for COB flip-chip comprises the following steps:
s1, printing a circuit layer on the flexible belt body, and then printing solder paste on the circuit layer in an area corresponding to the hard change capsules;
s2, printing solder paste on the back electrode of the flip chip, and fixing the flip chip by reflow soldering;
and S3, spraying epoxy resin paint between the flip chip and the circuit layer to form an insulating protective layer, carrying out electrical detection, and packaging and warehousing after the product is qualified.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme can be realized by embedding the strip-shaped heat-conducting oil bag in the flexible belt body, can simultaneously improve the heat radiation and the strength of the flexible belt body, and through the way of matching with the semi-hard bag, when the flexible belt body is curled, the hardening anti-rolling ball in the strip-shaped heat conduction oil bag is pushed into the semi-hard bag in a proper posture through the deformation extrusion of the strip-shaped heat conduction oil bag, the hard anti-rolling ball is extruded when moving into the semi-hard bag, thereby triggering the stretching action of the semi-hard bag, extending the anti-rolling entanglement wire from the inner part, and is interlaced and entangled with the anti-winding filament on the adjacent semi-hard bag, thereby improving the overall strength of the semi-hard bag, thereby hinder the further curling of flexible band body, effectively guarantee to be in reasonable structural stability all the time with the flip chip that half hard bag corresponds, the unstability or even damage phenomenon is difficult to appear, is showing security and the stability that improves the COB flip-chip.
(2) The shape-controlled composite membrane comprises an elastic bottom membrane and a magnetic shielding surface layer, the magnetic shielding surface layer covers the outer surface of the elastic bottom membrane, a plurality of expansion joints which are uniformly distributed are formed in the elastic bottom membrane and the magnetic shielding surface layer, the expansion joints are matched with the hard anti-rolling balls, the magnetic shielding surface layer plays a role in shielding magnetic fields of the magnetic absorption blocks in a normal state, the phenomenon that the hard anti-rolling balls in the strip-shaped heat conduction oil bags interfere with each other to influence distribution is avoided, the shape-controlled composite membrane is deformed and curled synchronously when the flexible belt body is curled, the hard anti-rolling balls in the strip-shaped heat conduction oil bags are extruded, then the expansion joints are opened to allow the hard anti-rolling balls to pass through, the magnetic absorption effect of the magnetic absorption blocks can act on the hard anti-rolling balls, the hard anti-rolling balls can be forced to adjust postures entering the hard anti-rolling bags, and further subsequent blocking effects are ensured.
(3) The position sleeve adopts stereoplasm heat conduction material to make, the hard bag that becomes and elasticity basement membrane all adopt elasticity heat conduction material to make, the position sleeve plays the setting effect to the hard bag on the one hand, ensure that it holds the conduction oil and the hard ball of preventing of rolling up with the space of relative unchangeable all the time, thereby improve the intensity of hard bag department under the intensive distribution of hard ball of preventing, the intensity that wholly promotes the flexible belt body is matched together with the position sleeve is difficult for continuing to curl, on the other hand position sleeve and hard bag all can utilize excellent heat conductivity to improve the radiating effect of flexible belt body.
(4) The hard anti-rolling ball comprises a pneumatic hemisphere, a floating hemisphere, a plurality of supporting rods and a pneumatic sleeve, wherein the supporting rods and the pneumatic sleeve are connected between the pneumatic hemisphere and the floating hemisphere, the pneumatic sleeve is located on the outer side of the supporting rods, the supporting rods play a role in fixing the pneumatic hemisphere and the floating hemisphere, the hard anti-rolling ball moves to the middle region in the hard variable bag, the shape control composite film acts on the pneumatic sleeve to force inward compression, and therefore the change of air pressure is utilized to trigger the stretching action on the pneumatic hemisphere
(5) Pneumatic hemisphere and the hemisphere symmetric distribution that floats, and the internal surface of pneumatic hemisphere and the hemisphere that floats is the cambered surface that mutual arch is close to, pneumatic hemisphere adopts ferromagnetic material to make, the hemisphere that floats adopts light material to make, pneumatic hemisphere can enter into in the hard bag with the exact gesture under the magnetic attraction effect of absorption magnetic path, and the hemisphere that floats then can guarantee to urge hard to prevent roll up the ball whole and have certain buoyancy, keep it and can suspend in the conduction oil, be favorable to its spatial distribution in the conduction oil, and the cambered surface characteristic of pneumatic hemisphere and the hemisphere that floats, not only do benefit to accuse shape complex film and compress the atmospheric pressure cover, also easily withdraw from simultaneously and reset.
(6) The pneumatic hemisphere is provided with a spherical air cavity, the spherical air cavity is communicated with the strip-shaped heat conduction oil bag, an expansion air film is connected in the spherical air cavity, one end of the expansion air film, far away from the floating hemisphere, is connected with a plurality of anti-winding entanglement wires, the pneumatic hemisphere is provided with an extension hole matched with the anti-winding entanglement wires, after the air pressure sleeve is extruded, the air in the pneumatic hemisphere can enter the spherical air cavity to inflate the expansion air film, the pneumatic hemisphere is forced to expand and then is pushed to prevent the winding entanglement wires from extending outwards from the extension hole.
(7) The anti-rolling entanglement wire comprises an inner adaptive wire, an outer adaptive wire and a direction-limiting pull wire, wherein the inner adaptive wire and the outer adaptive wire are symmetrically connected, the outer adaptive wire is connected with an expansion air film through the inner adaptive wire, the direction-limiting pull wire is connected between the inner adaptive wire and the outer adaptive wire, the direction-limiting pull wire is positioned on one side, away from a floating hemisphere, of the inner adaptive wire and the outer adaptive wire, the inner adaptive wire is used for preventing the flexible belt body from further rolling by utilizing high-strength characteristics, the outer adaptive wire can meet self-adaptive stretching after expansion of the expansion air film by utilizing characteristics, the direction-limiting pull wire is used for limiting the bending direction of the anti-rolling entanglement wire, the anti-rolling entanglement wire is forced to bend only in the direction in which the hard anti-rolling ball exits, and when the flexible belt body is curled, the direction-limiting pull wire is not stretchable.
(8) Contact each other between the semihard bag, bar heat conduction oil pocket one end is kept away from to the position sleeve is the cambered surface, and hard bag and flip chip phase-match become, and semihard bag not only can wholly improve the intensity and the thermal diffusivity of flexible area body, when curling in the contact area simultaneously, the cambered surface can conflict each other and prevent further curling after curling to a certain extent, can protect the flexible area body equally.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the construction of a semi-rigid pouch according to the present invention;
FIG. 3 is a schematic structural diagram of a shape-controlled composite membrane according to the present invention;
FIG. 4 is a schematic structural view of a hardening promotion anti-rolling ball in a normal state;
FIG. 5 is a schematic view of the structure of the stiffening anti-roll ball according to the present invention in an extended state;
FIG. 6 is a schematic structural view of the anti-wind entangling wire of the present invention;
FIG. 7 is a schematic structural view of the present invention in a state of the anti-wind entangling yarn being interlaced.
The reference numbers in the figures illustrate:
the flexible belt comprises a flexible belt body 1, a circuit layer 2, a flip chip 3, a strip-shaped heat conduction oil bag 4, a semi-hard bag 5, a positioning sleeve 51, a hard change bag 52, an adsorption magnet 53, a shape control composite film 54, an elastic bottom film 541, a magnetic shielding surface 542, an expansion joint 543, a heat conduction wire 6, a hard anti-rolling ball 7, a pneumatic hemisphere 71, a floating hemisphere 72, a support rod 73, a pneumatic sleeve 74, an expansion air film 8, an anti-rolling entanglement wire 9, an internal adaptation wire 91, an external extension wire 92 and a direction-limiting pull wire 93.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", 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 constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; 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.
Example 1:
referring to fig. 1-2, a flexible band for COB flip-chip includes a flexible band body 1, a circuit layer 2 is connected to the upper end of the flexible band body 1, a plurality of flip-chip 3 are connected to the circuit layer 2, a bar-shaped heat-conducting oil bag 4 is connected to the flexible band body 1 by embedding, heat-conducting oil is filled in the bar-shaped heat-conducting oil bag 4, a plurality of semi-hard bags 5 are connected to one end of the bar-shaped heat-conducting oil bag 4 close to the flip-chip 3, the semi-hard bags 5 correspond to the flip-chip 3, a plurality of heat-conducting wires 6 are connected between the semi-hard bags 5 and the circuit layer 2, the semi-hard bags 5 include a positioning sleeve 51 and a hard variable bag 52, the hard variable bag 52 is embedded in the center of the positioning sleeve 51, an adsorption magnetic block 53 is embedded in the hard variable bag 52, a shape-controlling composite film 54 is connected between the hard variable bag 52 and the bar-shaped heat-conducting oil bag 4, a plurality of permeation holes corresponding to the shape-controlling composite film 54 are opened on the bar-conducting oil bag 4, and a plurality of hardening anti-rolling balls 7 are filled in the heat conduction oil.
Referring to fig. 3, the shape control composite film 54 includes an elastic base film 541 and a magnetic shielding surface 542, the magnetic shielding surface 542 covers the outer surface of the elastic base film 541, the elastic base film 541 and the magnetic shielding surface 542 are both provided with a plurality of uniformly distributed expansion joints 543, and the expansion joint 543 is matched with the hardening prevention rolling ball 7, the magnetic shielding surface layer 542 plays a role of shielding the magnetic field of the adsorption magnetic block 53 in a normal state, the influence on the distribution caused by the interference of the hardening prevention rolling ball 7 in the strip-shaped heat conduction oil bag 4 is avoided, when the flexible belt body 1 is curled, the shape-changing composite film 54 is synchronously deformed and curled, the hardening anti-rolling ball 7 in the strip-shaped heat-conducting oil bag 4 is extruded, then the expansion gap 543 is opened for the hardening promotion anti-rolling ball 7 to pass through, at this time, the magnetic attraction effect of the attraction magnetic block 53 acts on the hardening promotion anti-rolling ball 7, the stiffening anti-roll ball 7 can be forced to adjust into the position in the stiffening bladder 52, thereby ensuring the subsequent blocking effect.
The position sleeve 51 is made of hard heat conduction materials, the hard capsule 52 and the elastic base film 541 are made of elastic heat conduction materials, the position sleeve 51 plays a role in shaping the hard capsule 52 on one hand, it is ensured that heat conduction oil is contained in a relatively unchangeable space all the time and the hard anti-rolling ball 7 is promoted, so that the strength of the hard capsule 52 is improved under the dense distribution of the hard anti-rolling ball 7, the strength of the whole improved flexible belt body 1 is not prone to continuing to curl when the position sleeve 51 is matched, and on the other hand, the position sleeve 51 and the hard capsule 52 can both utilize excellent heat conduction to improve the heat dissipation effect of the flexible belt body 1.
Referring to fig. 4-5, the hardening anti-rolling ball 7 includes a pneumatic hemisphere 71, a floating hemisphere 72, a plurality of support rods 73 and a pneumatic sleeve 74, the support rods 73 and the pneumatic sleeve 74 are connected between the pneumatic hemisphere 71 and the floating hemisphere 72, the pneumatic sleeve 74 is located outside the support rods 73, the support rods 73 fix the pneumatic hemisphere 71 and the floating hemisphere 72, after the hardening anti-rolling ball 7 moves to the middle region in the hard variable cell 52, the shape control composite membrane 54 acts on the pneumatic sleeve 74 to force inward compression, so as to trigger the stretching action on the pneumatic hemisphere 71 by using the change of the pneumatic pressure
The pneumatic hemisphere 71 and the floating hemisphere 72 are symmetrically distributed, the inner surfaces of the pneumatic hemisphere 71 and the floating hemisphere 72 are cambered surfaces protruding and close to each other, the pneumatic hemisphere 71 is made of ferromagnetic materials, the floating hemisphere 72 is made of light materials, the pneumatic hemisphere 71 can enter the hard change bag 52 in a correct posture under the magnetic attraction effect of the adsorption magnetic block 53, the floating hemisphere 72 can guarantee that the whole hard anti-rolling ball 7 has certain buoyancy, the floating hemisphere can be kept suspended in heat conduction oil, the spatial distribution of the hard anti-rolling ball in the heat conduction oil is facilitated, the cambered surface characteristics of the pneumatic hemisphere 71 and the floating hemisphere 72 are beneficial to compressing the air pressure sleeve 74 by the shape control composite membrane 54, and meanwhile, the air pressure sleeve is easy to withdraw and reset.
Seted up spherical air cavity on pneumatic hemisphere 71, and spherical air cavity is linked together with bar heat conduction oil bag 4, the internal connection of spherical air cavity has inflation air film 8, inflation air film 8 is kept away from unsteady hemisphere 72 one end and is connected with many and prevents rolling up entangle silk 9, set up on pneumatic hemisphere 71 and prevent rolling up entangle silk 9 assorted extension hole, receive the extrusion back at atmospheric pressure cover 74, its inside air can enter into spherical air cavity and aerify inflation air film 8, force its inflation then promote to prevent rolling up entangle silk 9 and stretch from extending downthehole outside.
Referring to fig. 6-7, the anti-wind entangling filament 9 comprises an inner adaptive filament 91, an outer extended filament 92 and a direction-limiting pull wire 93, the inner adaptive filament 91 and the outer extended filament 92 are symmetrically connected, and the outer extending wire 92 is connected with the inflatable air film 8 through the inner accommodating wire 91, the direction-limiting pull wire 93 is connected between the inner accommodating wire 91 and the outer extending wire 92, the direction limiting pull wire 93 is positioned on one side of the inner adaptive wire 91 and the outer extended wire 92 away from the floating hemisphere 72, the inner adaptive wire 91 utilizes the high strength characteristic to hinder the flexible belt body 1 from further curling, the outer extended wire 92 can utilize the characteristic to meet the self-adaptive stretching after the expansion air film 8 expands, the direction limiting pull wire 93 limits the bending direction of the anti-rolling entanglement wire 9, the anti-rolling entanglement wire is forced to bend only in the direction of enabling the hard anti-rolling ball 7 to exit, when the flexible belt body 1 curls, the directional restricting stay 93 is not stretchable, and therefore, the bending deformation of the wind-up preventing entanglement yarn 9 is prevented.
The inner adaptive wire 91 is made of elastic materials, the outer extending wire 92 is made of hard materials, and the direction limiting pull wire 93 is made of non-elastic flexible materials.
Mutual contact between the half hard bag 5, the locating sleeve 51 is kept away from 4 one ends of bar heat conduction oil bag and is the cambered surface, and hard bag 52 and flip chip 3 phase-match, half hard bag 5 not only can wholly improve the intensity and the thermal diffusivity of flexible band body 1, when curling in the contact area simultaneously, the cambered surface can conflict each other and prevent further curling after curling to a certain degree, can protect flexible band body 1 equally.
The flip-chip process of the flexible belt for COB flip-chip comprises the following steps:
s1, printing a circuit layer 2 on the flexible tape body 1, and then printing solder paste on the circuit layer 2 in the area corresponding to the hard strain capsules 52;
s2, printing solder paste on the back electrode of the flip chip 3, and fixing the back electrode by reflow soldering;
and S3, spraying epoxy resin paint between the flip chip 3 and the circuit layer 2 to form an insulating protective layer, carrying out electrical detection, and packaging and warehousing after the product is qualified.
The invention can simultaneously improve the heat dissipation and the strength of the flexible belt body 1 by embedding the strip-shaped heat-conducting oil bag 4 in the flexible belt body 1, and push the hardening anti-rolling ball 7 in the strip-shaped heat-conducting oil bag 4 into the semi-hard bag 5 in a proper posture by the deformation extrusion of the strip-shaped heat-conducting oil bag 4 when the flexible belt body 1 is curled in a way of matching with the semi-hard bag 5, the hardening anti-rolling ball 7 is extruded when moving into the semi-hard bag 5, thereby triggering the extension action of the semi-hard bag 5, extending the anti-rolling entanglement wire 9 from the inner part, and interlacing and entangling with the anti-rolling entanglement wire 9 on the adjacent semi-hard bag 5, improving the overall strength of the semi-hard bag 5, thereby preventing the flexible belt body 1 from further curling, effectively ensuring that the flip chip 3 corresponding to the semi-hard bag 5 is always in reasonable structural stability and difficult to be unstable or even damaged, the safety and the stability of COB inversion are obviously improved.
The above are merely preferred embodiments of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (10)
1. The utility model provides a COB is flexonics area for flip-chip, includes flexonics area body (1), flexonics area body (1) upper end is connected with circuit layer (2), be connected with a plurality of evenly distributed's flip chip (3) on circuit layer (2), its characterized in that: the flexible belt comprises a flexible belt body (1), a strip-shaped heat conduction oil bag (4) is embedded and connected in the flexible belt body (1), heat conduction oil is filled in the strip-shaped heat conduction oil bag (4), one end, close to an inverted chip (3), of the strip-shaped heat conduction oil bag (4) is connected with a plurality of semi-hard bags (5) which are uniformly distributed, the semi-hard bags (5) correspond to the inverted chip (3), a plurality of heat conduction wires (6) which are uniformly distributed are connected between the semi-hard bags (5) and a circuit layer (2), each semi-hard bag (5) comprises a positioning sleeve (51) and a hard variable bag (52), the hard variable bags (52) are embedded in the centers of the positioning sleeves (51), an adsorption magnetic block (53) is embedded and connected in the hard variable bags (52), a shape control composite film (54) is connected between the hard variable bags (52) and the strip-shaped heat conduction oil bag (4), and a plurality of permeation holes corresponding to the shape control composite film (54) are formed in the strip-shaped heat conduction oil bag (4), and a plurality of hardening anti-rolling balls (7) are filled in the heat conduction oil.
2. The COB flip-chip flexible belt of claim 1, characterized in that: accuse shape complex film (54) include elasticity basement membrane (541) and magnetic shield top layer (542), magnetic shield top layer (542) cover in elasticity basement membrane (541) surface, a plurality of evenly distributed's dilatation joint (543) are all seted up on elasticity basement membrane (541) and magnetic shield top layer (542), and dilatation joint (543) with promote hard prevent rolling up ball (7) phase-match.
3. The COB flip-chip flexible belt of claim 2, characterized in that: the positioning sleeve (51) is made of hard heat conduction materials, and the hard capsule (52) and the elastic base membrane (541) are both made of elastic heat conduction materials.
4. The COB flip-chip flexible belt of claim 1, characterized in that: the hard anti-rolling ball (7) comprises a pneumatic hemisphere (71), a floating hemisphere (72), a plurality of supporting rods (73) and an air pressure sleeve (74), wherein the supporting rods (73) and the air pressure sleeve (74) are connected between the pneumatic hemisphere (71) and the floating hemisphere (72), and the air pressure sleeve (74) is located on the outer side of the supporting rods (73).
5. The COB flip-chip flexible belt of claim 4, characterized in that: pneumatic hemisphere (71) and unsteady hemisphere (72) symmetric distribution, and the internal surface of pneumatic hemisphere (71) and unsteady hemisphere (72) is the cambered surface that mutual arch is close to, pneumatic hemisphere (71) adopt ferromagnetic material to make, unsteady hemisphere (72) adopt light material to make.
6. The COB flip-chip flexible belt of claim 4, characterized in that: the pneumatic semi-sphere (71) is provided with a spherical air cavity, the spherical air cavity is communicated with the strip-shaped heat conduction oil bag (4), an expansion air film (8) is connected in the spherical air cavity, one end, far away from the floating semi-sphere (72), of the expansion air film (8) is connected with a plurality of winding-resistant wires (9), and the pneumatic semi-sphere (71) is provided with an extension hole matched with the winding-resistant wires (9).
7. The COB flip-chip flexible belt of claim 6, characterized in that: prevent rolling up entangle silk (9) including interior adaptation silk (91), outer extension silk (92) and limit to stay wire (93), interior adaptation silk (91) and outer extension silk (92) symmetric connection, and outer extension silk (92) are connected with inflation air film (8) through interior adaptation silk (91), limit to stay wire (93) connect in between adaptation silk (91) and the outer extension silk (92), and limit to stay wire (93) lie in one side that floating hemisphere (72) was kept away from to adaptation silk (91) and outer extension silk (92).
8. The COB flip-chip flexible belt of claim 7, characterized in that: the inner adaptive wire (91) is made of elastic materials, the outer extending wire (92) is made of hard materials, and the direction limiting pull wire (93) is made of non-elastic flexible materials.
9. The COB flip-chip flexible belt of claim 1, characterized in that: the semi-hard bag (5) is in contact with each other, one end, away from the strip-shaped heat conduction oil bag (4), of the positioning sleeve (51) is an arc surface, and the hard change bag (52) is matched with the flip chip (3).
10. The inverted mounting process of a flexible tape for COB inverted mounting according to any one of claims 1 to 9, wherein: the method comprises the following steps:
s1, printing a circuit layer (2) on the flexible belt body (1), and then printing solder paste on the circuit layer (2) in an area corresponding to the hard change bag (52);
s2, printing solder paste on the back electrode of the flip chip (3) and fixing the back electrode by reflow soldering;
and S3, spraying epoxy resin paint between the flip chip (3) and the circuit layer (2) to form an insulating protective layer, carrying out electrical detection, and packaging and warehousing after the product is qualified.
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|---|---|---|---|
| CN202110674417.6A CN113421957B (en) | 2021-06-17 | 2021-06-17 | Flexible belt for COB (chip on board) flip-chip and flip-chip process thereof |
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| CN202110674417.6A CN113421957B (en) | 2021-06-17 | 2021-06-17 | Flexible belt for COB (chip on board) flip-chip and flip-chip process thereof |
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Cited By (1)
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| CN114905152A (en) * | 2022-05-26 | 2022-08-16 | 宁波百飞特厨具有限公司 | Full-automatic welding device of pan handle connecting block |
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| CN113421957B (en) | 2022-08-23 |
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