CN1258199C - Deep etching plane magnet coil and making method - Google Patents
Deep etching plane magnet coil and making method Download PDFInfo
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- CN1258199C CN1258199C CN 200310115908 CN200310115908A CN1258199C CN 1258199 C CN1258199 C CN 1258199C CN 200310115908 CN200310115908 CN 200310115908 CN 200310115908 A CN200310115908 A CN 200310115908A CN 1258199 C CN1258199 C CN 1258199C
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Abstract
The present invention relates to a manufacturing method for plane electromagnetic coils in the micro motors, micro electromagnetic sensors and actuators. The shape of a coil is defined on the surface of a Si plate with a photoetching method. By using Si deep etching, according to the defined shape of the coil, a coil slot and a coil wiring through hole are etched on the surface of the Si plate. Metal plating is carried out in the coil slot, and a metal structure is obtained. The coil is inlaid in the coil slot because of surface roughness etched the inner surface of the coil slot. The coil comprises a base 1, the coil slot 2, the coil wiring through hole 3, an insulation layer 4, a seed layer 5, a metal wire 6, a wiring metal layer 7, wherein a deep slot with the same shape as the coil is etched on the surface of the Si plate; the coil is inlaid in the deep slot and can not fall off from the deep slot easily. The present invention solves the problems that the adhesion of the coil and the base is not tight, and the adhesion of optical etching glue and a base board, and negative glue are difficult to eliminate. The present invention adopts a thin glue photoetching technology and has the advantages of large tolerance of condition requirements, easy realization and repetition and high rate of a finished product.
Description
Technical field: the invention belongs to technical field of microelectronic mechanical systems, relate to the manufacture method that is used for electrical micro-machine, little electromagnetic sensor, actuator midplane solenoid.
Background technology: the plane solenoid is the important component part in various electrical micro-machines in the microelectromechanical systems, little electromagnetic sensor, the actuator.The manufacture craft of plane solenoid adopted LIGA and UV-LIGA technology mostly in the past, LIGA technology need be used synchrotron radiation light source and X-ray mask plate, UV-LIGA technology is a kind of accurate LIGA technology that adopts the ultraviolet thick resist lithography to replace the synchrotron radiation photoetching process, and employed photoresist is SU-8 negative photoresist or the thick glue of other positivity.Because Si or SiO
2The surface of substrate is very smooth, and the contact area of coil and substrate is very little, and therefore the coil that adopts said method to make exists with substrate and adheres to not firm problem, and coil is easy to come off from the surface of substrate under the effect of electromagnetic force, influences its useful life.After electroforming, the problem that also exists photoresist to be difficult to remove.Particularly said method is when making double plane electromagnetic coil, and technology difficulty is bigger, and repeatability is very poor, and rate of finished products is very low.
The content of innovation and creation: adhere to not firmly in order to solve in the background technology coil and substrate, be difficult to after the electroforming remove photoresist, technology difficulty is big, the problem that poor repeatability and rate of finished products are low, and the present invention proposes a kind of new process that can be used for making the plane solenoid.
The present invention proposes at first to utilize the normal optical lithography to define coil pattern on Si sheet surface, utilize the Si deep etching technology again, by the coil pattern that has defined, obtain being used for the coil groove and the coil lead through hole of damascene wiring plain conductor in Si sheet surface etch, carry out metal plating in the online ring recess, obtain the metal structure of coil, the surface roughness of utilizing coil groove inner surface to be produced in etching process is embedded in coil in the coil groove securely.
Plane of the present invention electromagnetic coil structure comprises: substrate 1, coil groove 2, coil lead through hole 3, insulating barrier 4, Seed Layer 5, metal wire 6, lead-in wire metal level 7, wired ring recess 2 of substrate 1 surface etch and coil lead through hole 3, through hole is arranged is coil lead through hole 3 in preparation on the body of substrate 1; Outer surface growth at substrate 1, coil groove 2 and coil lead through hole 3 has insulating barrier 4; In the bottom of the coil groove 2 that has insulating barrier 4 Seed Layer 5 and metal wire 6 are arranged; At the sidewall of the coil lead through hole 3 that has insulating barrier 4 Seed Layer 5 and lead-in wire metal level 7 are arranged, metal wire 6 at grade equidistantly repeatedly coiling and being embedded in the coil groove 2 constitute, the two ends of metal wire 6 prepare respectively coil lead hole 3.
When the plane solenoid that the present invention makes is worked, can when electric current passes through metal wire, can produce an electromagnetic field in the place, coil lead hole at metal wire two ends energized in the direction vertical with plane, coil place.
Good effect of the present invention: adhere to not firmly in order to solve in the background technology coil and substrate, be difficult to after the electroforming remove photoresist, technology difficulty is big, the problem that poor repeatability and rate of finished products are low, and the present invention proposes:
(1) utilizes the deep etching technology of Si, go out deep trouth by coil shape in Si sheet surface etch, solve coil and substrate and adhered to not firm problem, the surface roughness of utilizing the deep trouth inner surface in etching process, to be produced, when being that electroforming formation coil is metal wire in the deep trouth, it is inlayed securely adhere in this deep trouth, and be difficult in groove, coming off.
(2) manufacture craft adopts the deep etching technology of general ultraviolet photoetching technique and Si, photoresist adopts the thin glue of positivity, do not need the used PMMA of LIGA and UV-LIGA technology, SU-8 negative photoresist and the thick glue of positivity, therefore can solve the bonding of photoresist and substrate and the problem that negative glue is difficult to remove photoresist.
(3) adopt normal thin glue photoetching process, the tolerance that process conditions require is big, is easy to realize and repeat, and helps improving rate of finished products, has therefore overcome LIGA and UV-LIGA technical matters difficulty is big, poor repeatability and the low problem of rate of finished products.
Description of drawings:
Fig. 1 is the schematic perspective view of structure of the present invention
Fig. 2 is the generalized section of the structure after the deep erosion of substrate of the present invention,
Fig. 3 is the generalized section of structure of the present invention
Fig. 4 is the specific embodiment figure of biplane coil of the present invention.
Fig. 5 is the specific embodiment figure of monoplane of the present invention coil.
Embodiment:
Embodiment 1: double plane electromagnetic coil is included in A face and B face two parts in the substrate 1, and the A face of substrate 1 and B face are formed by coil groove 2, coil lead through hole 3, insulating barrier 4, Seed Layer 5, metal wire 6 and lead-in wire metal level 7.Adopt earlier the general ultraviolet photoetching technique can be chosen as rectangle or triangle or circle or polygon at the figure that the A of substrate 1 face and B face define coil respectively; Adopt the Si deep etching technology, etching obtains the coil groove 2 and the coil lead through hole 3 of A face and B face respectively; Thermal oxidation is carried out in substrate after the deep erosion 1, and at the outer surface of substrate 1, the inner surface thermal oxide growth in coil groove 2 and coil lead hole 3 has insulating barrier 4; Utilization sputters at coil groove 2 and the coil lead through hole 3 interior plated metal Seed Layer 5 after the thermal oxidation; Adopt little galvanoplastics that two-sided electroforming is carried out in substrate 1, finally obtain constituting the metal wire 6 and the lead-in wire metal level 7 of coil.The surface roughness of utilizing coil groove 2 and coil lead through hole 3 inner surfaces to be produced in etching process can make the coil metal line inlay securely and adhere in coil groove 2 and the coil lead through hole 3.
Structural material is selected:
High resistant Si monocrystal material, the SiO that insulating barrier 4 forms for thermal oxidation are adopted in substrate 1
2Material, Seed Layer 5 is a metallic copper, metal wire 6 and lead-in wire metal level 7 are metallic copper.
Specific embodiment:
The double plane electromagnetic coil technical process that the present invention proposes as shown in Figure 4.
(1) on the A of substrate 1 face, B face two sides, makes planar coil and coil lead hole pattern respectively by lithography; Use the Si deep etching technology, etch coil groove 2 and coil lead through hole 3, wherein the degree of depth of coil groove 2 is 20 μ m～60 μ m, and coil lead through hole 3 is a through hole, shown in (a) among Fig. 4;
(2) 1 structure of the substrate after the above-mentioned etching is carried out thermal oxidation, make its surface form insulating barrier 4, obtain the structure shown in (b) among Fig. 4;
(3) sputtering sedimentation Seed Layer 5 in coil groove 2 that forms insulating barrier 4 and coil lead through hole 3 obtains the structure shown in (c) among Fig. 4;
(4) electroforming forms metal wire 6 and lead-in wire metal level 7 in sputter has the coil groove 2 of Seed Layer 5 and coil lead through hole 3, obtains the structure shown in (d) among Fig. 4.
Embodiment 2: the monoplane solenoid is included in the A face portion of substrate 1, and the A face of substrate 1 is made up of coil groove 2, coil lead through hole 3, insulating barrier 4, Seed Layer 5, metal wire 6 and lead-in wire metal level 7.Adopt earlier the general ultraviolet photoetching technique to define the figure of coil at the A of substrate 1 face, the figure of coil can be chosen as rectangle or triangle or circle or polygon; Adopt the Si deep etching technology, etching obtains the coil groove 2 and the coil lead through hole 3 of A face; Thermal oxidation is carried out in substrate after the deep erosion 1, and at the outer surface of substrate 1, the inner surface thermal oxide growth in coil groove 2 and coil lead hole 3 has insulating barrier 4; Utilization sputters at coil groove 2 and the coil lead through hole 3 interior plated metal Seed Layer 5 after the thermal oxidation; Adopt little galvanoplastics that the single face electroforming is carried out in substrate 1, finally obtain constituting the metal wire 6 and the lead-in wire metal level 7 of coil.The surface roughness of utilizing coil groove 2 and coil lead through hole 3 inner surfaces to be produced in etching process can make the coil metal line inlay securely and adhere in coil groove 2 and the coil lead through hole 3.
Structural material is selected:
The structural material of embodiment 2 is identical with embodiment.
Specific embodiment:
The technical process that the present invention proposes as shown in Figure 5.
(1) makes planar coil and coil lead hole pattern by lithography at the A of substrate 1 face; Use the Si deep etching technology, etch coil groove 2 and coil lead through hole 3, wherein the degree of depth of coil groove 2 is 20 μ m～60 μ m, and coil lead through hole 3 is a through hole, shown in (a) among Fig. 5;
(2) 1 structure of the substrate after the above-mentioned etching is carried out thermal oxidation, make its surface form insulating barrier 4, obtain the structure shown in (b) among Fig. 5;
(3) sputtering sedimentation Seed Layer 5 in coil groove 2 that forms insulating barrier 4 and coil lead through hole 3 obtains the structure shown in (c) among Fig. 5;
(4) electroforming forms metal wire 6 and lead-in wire metal level 7 in sputter has the coil groove 2 of Seed Layer 5 and coil lead through hole 3, obtains the structure shown in (d) among Fig. 5.
Claims (2)
1, loses the manufacture method of plane solenoid deeply, it is characterized in that: utilize the normal optical lithography to define coil pattern on Si sheet surface, utilize the Si deep etching technology again, by the coil pattern that has defined, obtain being used for the coil groove and the coil lead through hole of damascene wiring plain conductor in Si sheet surface etch, carry out metal plating in the online ring recess, obtain the metal structure of coil, the surface roughness of utilizing coil groove inner surface to be produced in etching process is embedded in coil in the coil groove securely.
2, lose the plane solenoid deeply, comprise: substrate (1), coil lead through hole (3), insulating barrier (4), Seed Layer (5), lead-in wire metal level (7), it is characterized in that also comprising: coil groove (2), metal wire (6), wired ring recess of substrate (1) surface etch (2) and coil lead through hole (3) have insulating barrier (4) in the growth of the outer surface of substrate (1), coil groove (2) and coil lead through hole (3); In the bottom of the coil groove (2) that has insulating barrier (4) Seed Layer (5) and metal wire (6) are arranged; At the sidewall of the coil lead through hole (3) that has insulating barrier (4) Seed Layer (5) and lead-in wire metal level (7) are arranged, metal wire (6) at grade equidistantly repeatedly coiling and being embedded in the coil groove (2) constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310115908 CN1258199C (en) | 2003-12-11 | 2003-12-11 | Deep etching plane magnet coil and making method |
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|---|---|---|---|
| CN 200310115908 CN1258199C (en) | 2003-12-11 | 2003-12-11 | Deep etching plane magnet coil and making method |
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| CN1258199C true CN1258199C (en) | 2006-05-31 |
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| CN 200310115908 Expired - Fee Related CN1258199C (en) | 2003-12-11 | 2003-12-11 | Deep etching plane magnet coil and making method |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2159556B1 (en) * | 2007-06-19 | 2017-03-22 | Murata Manufacturing Co. Ltd. | Temperature sensor with lead wires |
| CN102285633B (en) * | 2011-07-04 | 2014-03-26 | 上海先进半导体制造股份有限公司 | Composite integrated sensor structure and manufacturing method thereof |
| KR101503144B1 (en) * | 2013-07-29 | 2015-03-16 | 삼성전기주식회사 | Thin film type inductor and method of manufacturing the same |
| CN105977240A (en) * | 2016-05-17 | 2016-09-28 | 电子科技大学 | Monolithic integration miniature transformer |
| CN106653728A (en) * | 2016-11-23 | 2017-05-10 | 无锡吉迈微电子有限公司 | Integrated inductor structure and manufacturing method thereof |
| CN108010712A (en) * | 2018-02-05 | 2018-05-08 | 深圳前海奥磁技术有限公司 | A kind of flat surface transformer winding and preparation method thereof |
| CN111243852B (en) * | 2020-03-05 | 2021-07-30 | 上海迈铸半导体科技有限公司 | Method for reducing tail length tolerance of spiral coil, spiral coil and spiral inductor |
| CN111443314B (en) * | 2020-04-09 | 2021-09-07 | 上海交通大学 | Thin film magnetic sensor with groove structure |
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