CN101719414A - Inductor and manufacturing method thereof - Google Patents
Inductor and manufacturing method thereof Download PDFInfo
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- CN101719414A CN101719414A CN200910189412A CN200910189412A CN101719414A CN 101719414 A CN101719414 A CN 101719414A CN 200910189412 A CN200910189412 A CN 200910189412A CN 200910189412 A CN200910189412 A CN 200910189412A CN 101719414 A CN101719414 A CN 101719414A
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Abstract
The invention discloses an inductor and a manufacturing method thereof. The inductor comprises a magnet and a terminal electrode, wherein the magnet is internally provided with a coil, and a coil electrode is connected with the terminal electrode; the edge of the coil approaches the surface of the magnet; a glass layer covers on the surface of the magnet except the end head of the magnet; and the terminal electrode is directly combined with the end head of the magnet. The manufacturing method comprises the following steps of: (a) magnet preparation: arranging the coil the edge of which approaches the surface of the magnet in the magnet; (b) forming the glass layer on the surface of the magnet except the end head of the magnet; and (c) forming the terminal electrode on the end head of the magnet and connecting the terminal electrode with the coil. At the same time of increasing the area of the coil in the inductor and improving the inductance, the invention can improve the quality factor Q of the inductor and guarantee the reliability of the inductor.
Description
Technical field
The present invention relates to electronic component, particularly a kind of inductor and preparation method thereof.
Background technology
In recent years, along with the extensive use of electronic devices and components, when paying attention to element function, pay close attention to reliability, the especially reliability of service life of element more.Fig. 1 a is the volume rendering schematic diagram of a lamination sheet type ceramic electrical sensor, and coil electrode is contained in its inside.Be accompanied by the development trend of inductor super large sensibility reciprocal, present stage big sensibility reciprocal product inductance value far away can not practical requirement, need the further product of the bigger sensibility reciprocal of exploitation.Computing formula according to inductance value:
L＝u
0u
eN
αS/l
Under the fixing prerequisite of element material Ue and component size, want to improve inductance value L, the essential area coil S that improves.During the routine inductor design,, often require the coil distance magnet surface to leave certain surplus, avoid coil to expose and corroded at the magnet outer surface in order to guarantee the element operate as normal.Shown in Fig. 1 b, promptly inductor stays limit amount L to have lower limit, and this has just limited area coil S, thereby has limited the element inductance value.As Fig. 1 c, inductor stays the limit amount to approach 0, and area coil S is very big, can form bigger inductance value.But this inductor internal electrode 15 is after cutting into lamination element individuality, and inductor interior section electrode can expose at the magnet outer surface.Because exposed electrode can be by eremacausis, and then lost efficacy and caused product failure, so this big inductance quantity design reality seldom is used.
Summary of the invention
Main purpose of the present invention is exactly at the deficiencies in the prior art, and a kind of inductor and preparation method thereof is provided, and can stay the limit to measure by the coil that reduces inductor and improve inductance value and inductor quality factor, can guarantee the reliability of inductor again.
For achieving the above object, the present invention is by the following technical solutions:
A kind of inductor, comprise magnet and terminal electrode, described magnet inside is provided with coil, described coil is electrically connected described terminal electrode, the edge of described coil is near the surface of described magnet, the end that described magnet is removed on the surface of described magnet is coated with glassy layer, and described terminal electrode directly combines with the termination of described magnet.
A kind of inductor manufacture method may further comprise the steps:
A. prepare magnet, be included in described magnet inside the coil of edge near described magnet surface is set;
B. form glassy layer on the surface of removing its termination of described magnet; With
C. form terminal electrode in the termination of described magnet and connect described coil.
Preferably, described step b comprises following substep:
B1. adopt labile end-blocking material to coat the termination of described magnet, form end sealing magnet;
B2. form described glassy layer on the surface of described end sealing magnet;
B3. cure described end sealing magnet so that the glass at described end-blocking material and end-blocking place breaks away from from the termination of described magnet;
Preferably, described end-blocking material is a resinous material.
Preferably, described step b2 comprises following substep:
Organic compounds such as glass and isopropyl alcohol are mixed form solution;
Add the corundum bead in described solution, barreling reaches 2～5um up to glass particle granularity D50;
Spray described solution by spray gun in described end sealing magnet, or described end sealing magnet is flooded in described solution, thereby form one deck glass liquid film on the surface of described end sealing magnet; With
Low temperature drying solidifies described glass liquid film.
Preferably, described step b3 comprises following substep:
Described end sealing magnet was cured 1～3 hour, make the softening and connection densification of glass particle;
Described end-blocking material expanded by heating when curing, the glass of the end of described magnet breaks owing to this expansion and peels off; With
Described end-blocking material continues to raise along with temperature and decomposes gasification.
Preferably, among the described step b3, after curing, also carry out chamfering, with the termination of residual glass removal in termination with level and smooth described magnet.
Preferably, among the described step c, form in the electric conducting material of described terminal electrode and contain glass, described electric conducting material partly combines with the termination and the described magnet surface glassy layer of described magnet.
Preferably, described step c comprises following substep:
C1. on smooth metal substrate, form and have certain thickness slurry silverskin as described electric conducting material; With
C2. the termination of described magnet is inserted described slurry silverskin, the size of described slurry silverskin is greater than the size of the cross section of described glassy layer and the formation of described magnet.
Preferably, described magnet is no more than 1/4 of inductor length by the difference of described terminal electrode length that coats and the length that is coated by described end-blocking material.
Beneficial technical effects of the present invention is:
According to inductor of the present invention; the coil of its magnet inside is provided with according to the mode of edge near magnet surface; the limit amount L that stays that is coil is close to 0; increased the area coil of inductor; simultaneously; be formed with glassivation owing to remove the surface of its termination at magnet; the termination of magnet forms terminal electrode and directly connects described coil; therefore; not only prevented from when coil stays the limit amount very little, easily to cause by eremacausis, can also avoid applying the harmful effect that glass brings the connectivity of product internal electrode and outer electrode with extraneous the contact.Thereby the present invention has improved the inductance value and the induction quality factor Q value of inductor on the basis of the reliability of guaranteeing inductor.
Preferably,, also combine when making the termination combination of electric conducting material and magnet, can effectively increase the cohesive force of terminal electrode and magnet, strengthen element termination adhesive force, further improve the reliability of element with glassy layer by the control terminal electrode size.
Description of drawings
Fig. 1 a is a laminated chip inductor Inside coil volume rendering schematic diagram;
Fig. 1 b is that the laminated chip inductor Inside coil stays limit amount schematic diagram;
Fig. 1 c stays limit amount to be decreased near after 0 known laminated chip inductor Inside coil, causes inductor interior section electrode to expose schematic diagram at the magnet outer surface;
Fig. 2 is the sectional view of the embodiment of a kind of laminated chip inductor of the present invention;
Fig. 3 a is the flow chart of inductor manufacture method embodiment of the present invention;
Fig. 3 b is the Product Status schematic diagram (not timberline circle) corresponding with each operation among Fig. 3 a;
Fig. 4 is the length schematic diagram that end-blocking material and terminal electrode coat magnet respectively among a kind of embodiment, and a is an end-blocking material coated length, and b is the terminal electrode coated length;
Fig. 5 follows terminal electrode and end-blocking material to coat the magnet size gap to change, and the magnet termination adhesive force that causes changes schematic diagram;
Fig. 6 follows inductor element of the present invention to stay the limit amount to reduce the schematic diagram that inductance value progressively improves;
Fig. 7 follows inductor element of the present invention to stay the limit amount to reduce the schematic diagram that the inductor quality factor q progressively improves.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described in detail.
Fig. 2, Fig. 3 a and Fig. 3 b have showed laminated chip inductor 21 of a kind of embodiment and preparation method thereof, described inductor comprises magnet 10 and terminal electrode 12,13, described magnet inside is provided with coil 15, described coil 15 is electrically connected described terminal electrode 12,13 (not shown), the edge of described coil 15 is near the surface of described magnet 10, the end that described magnet is removed on the surface of described magnet 10 is coated with glassy layer 11, and described terminal electrode directly combines with the termination of described magnet.
See also Fig. 3 a and Fig. 3 b, the embodiment that the method according to this invention is made a kind of laminated chip inductor may further comprise the steps:
Step 1. magnet preparatory process
Can adopt known technology, form the multi-layered ceramic main body 10 of the magnet preparatory process correspondence shown in Fig. 3 b.
Step b. termination procedure
Use labile resinous material, coat the two ends of multi-layered ceramic main body, form the end sealing magnet 14 of the termination procedure correspondence shown in Fig. 3 b.
Used resin material can be an epoxy resin, but is not limited thereto.
Should point out that under the prerequisite of magnet end face that can adequately protect, the end-blocking portion size is the smaller the better.
The step c working procedure of coating
Promptly, form one deck glassy layer 11 at the element outer surface by adopting the method for coating or dipping.
At first, organic compounds such as glass and isopropyl alcohol can be mixed forming solution, add the corundum bead, barreling 24～36 hours treats that glass particle granularity D50 stops barreling when reaching 2～5um left and right sides;
Then, flood in glass solution by the spray gun spraying or with element again, thereby form one deck glass liquid film in magnet surface;
Next after solidifying by low temperature drying, form the magnet of the working procedure of coating correspondence shown in Fig. 3 b.
Steps d. cure operation
This operation also can be called end-blocking chemical industry preface, and main acting on is to make the glassy layer densification of magnet surface, and removes the end-blocking material synchronously.
At first, the element that coating is finished cured 2 hours in high temperature (for example greater than 500 ℃), can be according to the different practical operation temperature of adjusting of the glass material of selecting.In high-temperature process, glass particle is softening, and interconnects densification.Meanwhile, end-blocking material expanded by heating, end portion glass are peeled off owing to breaking appears in the end-blocking material that expands earlier.Along with temperature continue to raise, the end-blocking material begins to decompose gasification, and disappears from the element termination, and then the termination of magnet exposes again in air, promptly obtains the magnet that cures the operation correspondence shown in Fig. 3 b.
Therefore during actual fabrication, consider that the interface of breaking when glass breakage is peeled off is irregular, segment glass may not can be peeled off fully, preferably also carries out chamfering after finishing curing, and the termination residual glass is removed termination with level and smooth magnet.
Step e. terminal chemical industry preface
Promptly form the outside terminal electrode that connects, this operation can adopt to be stained with electrocondution slurry in the element termination and to realize.
At first, formation has certain thickness silverskin on smooth metal substrate, and the element magnet that then will fix inserts silverskin, thereby forms the terminal electrode 12,13 that the terminal chemical industry ordered pair shown in Fig. 3 b is answered.
Preferably, form in the silverskin of described terminal electrode and contain glass, the size that silverskin coats magnet coats the size of magnet greater than the end-blocking material, and terminal electrode is contacted with glassy layer.This can realize in the following manner, when promptly being stained with silver, makes the size of the cross section that silverskin size that magnet enters forms greater than end-blocking material and described glassy layer and described magnet.Silver slurry glass merges mutually with magnet and combines, and simultaneously, has certain contact area because the silver slurry of formation terminal electrode contains a certain proportion of glass and terminal electrode and glassy layer, so silver slurry glass also mutually combines with glassy layer when combining with magnet.At this moment, two parts of glassy layer adhesion of silver slurry glass and magnet adhesion and silver slurry glass and coating have been formed the terminal electrode adhesive force of element jointly.
Fig. 4 is two kinds of sizes diagrams relatively, and a is end-blocking material and magnet contact size (being the size that coats magnet on the length direction), and b is terminal electrode and magnet contact size, and b is greater than a.Experimental result shows that this can effectively improve the adhesion between member end sub-electrode and the magnet, increases the element Mechanical Reliability.Fig. 5 is | the b-a| value is to the schematic diagram that influences of element terminal adhesive force.
When actual components is made, consider terminal electrode too conference influence element function and element outward appearance, preferably | b-a| is no more than 1/4 size of leement duration.
Table 1 different glass layer thickness is to the inductance element reliability effect
Wherein each failtests condition is as follows:
High/low-temperature impact: 125 ℃ of 30 minutes times of temperature, switched to low temperature-55 ℃ maintenance 30 minutes in 20 seconds, experience 100 circulates;
Damp and hot impact: 55 ℃ of temperature, humidity 95%RH, experimental period 1000 hours;
High temperature load: 125 ℃ of temperature, under the making current situation, to test 1000 hours, size of current is determined by the inductor rated current;
Damp and hot load: 55 ℃ of temperature, humidity 95%RH tested 1000 hours, and size of current is determined by the inductor rated current.
As shown in Figure 6, according to embodiments of the invention, inductor progressively increases coil width under the constant situation of loop length, reduces coil and stays limit amount L, and area coil S increases, thereby inductance value steadily improves.As shown in Figure 7, correspondence is therewith, follows coil to stay reducing of limit amount L, and the quality factor q value of inductor is also increasing.The possible cause that causes this phenomenon is constantly to reduce along with staying the limit to measure L, and coil and magnet surface spacing reduce, and off-energy reduced when magnetic induction line penetrated magnet, and the inductor energy storage increases, so the Q value increases.
Experimental result shows, the invention provides a kind of coil and stays the limit amount to be decreased near 0, and the impregnable solution of inductor reliability.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. inductor, comprise magnet and terminal electrode, described magnet inside is provided with coil, described coil electrode connects described terminal electrode, it is characterized in that, the edge of described coil is near the surface of described magnet, and the end that described magnet is removed on the surface of described magnet all is coated with glassy layer, and described terminal electrode directly combines with the termination of described magnet.
2. an inductor manufacture method is characterized in that, may further comprise the steps:
A. prepare magnet, be included in described magnet inside the coil of edge near described magnet surface is set;
B. form glassy layer on the surface of removing its termination of described magnet; With
C. form terminal electrode in the termination of described magnet and connect described coil.
3. inductor manufacture method as claimed in claim 2 is characterized in that, described step b comprises following substep:
B1. adopt labile end-blocking material to coat the termination of described magnet, form end sealing magnet;
B2. form described glassy layer on the surface of described end sealing magnet;
B3. cure described end sealing magnet so that the glass at described end-blocking material and end-blocking place breaks away from from the termination of described magnet.
4. inductor manufacture method as claimed in claim 3 is characterized in that, described end-blocking material is a resinous material.
5. inductor manufacture method as claimed in claim 3 is characterized in that, described step b2 comprises following substep:
Organic compounds such as glass and isopropyl alcohol are mixed form solution;
Add the corundum bead in described solution, barreling reaches 2～5um up to glass particle granularity D50;
Spray described solution by spray gun on described end sealing magnet surface, or described end sealing magnet is flooded in described solution, thereby form one deck glass liquid film on the surface of described end sealing magnet; With
Low temperature drying solidifies described glass liquid film.
6. inductor manufacture method as claimed in claim 3 is characterized in that, described step b3 comprises following substep:
Described end sealing magnet was cured 1～3 hour, make the softening and connection densification of glass particle;
Described end-blocking material expanded by heating when curing, the glass of the end of described magnet breaks owing to this expansion and peels off; With
Described end-blocking material continues to raise along with temperature and decomposes gasification.
7. inductor manufacture method as claimed in claim 3 is characterized in that, among the described step b3, also carries out chamfering after curing, with the termination of residual glass removal in termination with level and smooth described magnet.
8. as each described inductor manufacture method in the claim 2 to 7, it is characterized in that, among the described step c, form in the electric conducting material of described terminal electrode and contain glass, described electric conducting material combines with the part that the termination and the described glassy layer of described magnet do not break away from.
9. inductor manufacture method as claimed in claim 8 is characterized in that, described step c comprises following substep:
C 1. forms on smooth metal substrate has certain thickness slurry silverskin as described electric conducting material; With
C2. the termination of described magnet is inserted described slurry silverskin, the size of described slurry silverskin is greater than the size of the cross section of described glassy layer and the formation of described magnet.
10. inductor manufacture method as claimed in claim 8 is characterized in that, described magnet is no more than 1/4 of inductor length by the difference of described terminal electrode length that coats and the length that is coated by described end-blocking material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101894123A CN101719414B (en) | 2009-12-21 | 2009-12-21 | Inductor and manufacturing method thereof |
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|---|---|---|---|
| CN2009101894123A CN101719414B (en) | 2009-12-21 | 2009-12-21 | Inductor and manufacturing method thereof |
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| CN101719414A true CN101719414A (en) | 2010-06-02 |
| CN101719414B CN101719414B (en) | 2012-03-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103065784A (en) * | 2011-10-24 | 2013-04-24 | 西北台庆科技股份有限公司 | Inductance packaging method capable of stabilizing shape |
| WO2017190332A1 (en) * | 2016-05-06 | 2017-11-09 | 深圳顺络电子股份有限公司 | Inductor and manufacturing method therefor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789294B (en) * | 2009-12-16 | 2012-03-07 | 深圳顺络电子股份有限公司 | Electronic component and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103065784A (en) * | 2011-10-24 | 2013-04-24 | 西北台庆科技股份有限公司 | Inductance packaging method capable of stabilizing shape |
| WO2017190332A1 (en) * | 2016-05-06 | 2017-11-09 | 深圳顺络电子股份有限公司 | Inductor and manufacturing method therefor |
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| CN101719414B (en) | 2012-03-28 |
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Inventor after: Sun Feng Inventor after: Dai Chunlei Inventor after: Bao Hanqing Inventor after: Wu Jiancan Inventor before: Bao Hanqing Inventor before: Dai Chunlei Inventor before: Sun Feng Inventor before: Wu Jiancan |
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Free format text: CORRECT: INVENTOR; FROM: BAO HANQING DAI CHUNLEI SUN FENG WU JIANCAN TO: SUN FENG DAI CHUNLEI BAO HANQING WU JIANCAN |
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