CN1204576C - Variable capacitor - Google Patents
Variable capacitor Download PDFInfo
- Publication number
- CN1204576C CN1204576C CNB011236922A CN01123692A CN1204576C CN 1204576 C CN1204576 C CN 1204576C CN B011236922 A CNB011236922 A CN B011236922A CN 01123692 A CN01123692 A CN 01123692A CN 1204576 C CN1204576 C CN 1204576C
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- China
- Prior art keywords
- electrode
- stator
- rotor
- variable capacitor
- center
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000003990 capacitor Substances 0.000 title claims abstract description 50
- 230000002093 peripheral effect Effects 0.000 claims abstract description 24
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 description 18
- 230000000694 effects Effects 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
- H01G5/04—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of effective area of electrode
- H01G5/06—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture using variation of effective area of electrode due to rotation of flat or substantially flat electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G5/00—Capacitors in which the capacitance is varied by mechanical means, e.g. by turning a shaft; Processes of their manufacture
- H01G5/01—Details
- H01G5/011—Electrodes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The variable capacitor is provided with a stator 20, having the stator electrode 21 and a dielectric layer 25 formed to cover the stator electrode 21 and a conductive rotor 30 which is arranged on the stator 20, so that it can rotate and in which rotor electrodes 31 and 32 which are brought into contact with the surface of the dielectric layer 25 are protrusively formed on a lower face. The rotor electrodes have electrode shapes, obtained by causing the main electrode 31 into an almost semicircle shape, which is concentric with a rotary center of the rotor, to face the auxiliary electrode 32, into a almost semicircle shape, which is concentric with the rotary center of the rotor and is smaller than the main electrode. The main electrode 31 can be confronted with the stator electrode 21 through the dielectric layer 25, with the rotation of the rotor and the auxiliary electrode 32 being not confronted with the stator electrode 21, irrespective of the rotary position of the rotor. The stator electrode 21 has an arc-like inner peripheral edge whose center is the rotary center of the rotor, which is smaller than the outer peripheral edge of the main electrode 31 and is larger than the outer peripheral edge of the auxiliary electrode 32.
Description
Technical field
The present invention relates to a kind of variable capacitor, particularly a kind of by allowing rotor rotate with respect to stator, can change the small-sized variable capacitor of its static capacity.
Background technology
As this variable capacitor, for example knownly open in the flat 10-321467 communique on the books the spy.Fig. 1～Fig. 3 is illustrated in the variable capacitor A that is put down in writing in this communique, and this variable capacitor A roughly comprises stator 2, rotor 3 and lid 4.
The major part of stator 2 is made of ceramic dielectric, and integral body is that rectangle is tabular.Inner near the skin section of stator 2, as shown in Figure 2, left-right symmetric forms stator electrode 5,6.On the both ends lateral surface of the long side direction of stator 2, be formed with respectively and these stator electrodes 5,6 one-tenth stator terminal 7,8 that the conducting film that is electrically connected constitutes.In the skin section of stator 2, form the dielectric layer 9 have dielectric one one and covering stator electrode 5,6.
In addition, form 5,6 and two stator terminal the 7, the 8th of two stator electrodes,, when assembling variable capacitor A, allow stator 2 not have directivity in order to allow stator 2 become the left-right symmetric shape.At this moment, stator electrode 6 that is connected with the lid terminal 18 that illustrates later and stator terminal 8 are not as the dummy electrode and the terminal of stator electrode and terminal effect.If do not eliminate necessity of directivity, also can omit in the stator electrode 5,6 and the stator terminal 7,8.
Lid 4 cover rotor 3 above, be fixed on simultaneously on the stator 2, constitute by rubber-like metals such as stainless steels.By these lid 4 support rotor 3, and can rotate with respect to stator 2.On lid 4, be formed with the window 14 that allows the embeded slot 13 of rotor 3 expose.
Around window 14, be provided with and push the top of rotor 3 and be used to allow the spring action portion 15 of rotor 3 to stator 2 crimping.Spring action portion 15 around window 14, is the horn shape that tilts downwards toward the center.Inner peripheral portion in spring action portion 15 uniformly-spaced is formed with a plurality of protuberances 16 that protrude downwards at circumferencial direction, and these protuberances 16 are the contact of one-tenth point on rotor 3.
On lid 4, be wholely set the lid terminal 18 that extends along the side of stator 2 downwards.Lid terminal 18 with the position that is arranged on stator terminal 8 subtends on the stator 2 on extend, by between lid terminal 18 and stator terminal 8, injecting scolding tin (figure does not draw) that lid 4 is strong fixing with stator 2, can allow stator terminal 8 as 18 effects of lid terminal simultaneously.
Under the assembled state of variable capacitor A, rotor electrode 11 produces static capacity by the dielectric layer 9 and stator electrode 5 subtends of stator 2.If rotary rotor 3, the effective subtend area change between rotor electrode 11 and the stator electrode 5 can allow static capacity change.This static capacity, the stator terminal 7 that is electrically connected with stator electrode 5 and be electrically connected with rotor 3 with rotor electrode 11 be arranged on output between the lid terminal 18 on the lid 4.
In above-mentioned such variable capacitor A that constructs, obtain its minimum static capacity, be rotary rotor 3 to do not allow rotor electrode 11 and stator electrode 5 relative to the position on.At this moment, protrude the following protuberance 12 and stator electrode 5 subtends that is arranged on rotor 3.Because protuberance 12 contacts with the dielectric layer 9 of stator 2, is in the approximated position with stator electrode 5, exist the problem what can produce capacitance for this reason.
In addition,, replace single protuberance 12 as described above, be arranged in a plurality of protuberances of circular-arc configuration, perhaps form circular-arc continuous protuberance (for example the spy opens flat 11-87174 communique) in order to improve the rotational stability of rotor 3.At this moment, owing to increased the capacitance that is produced between protuberance and the stator electrode 5, also just increased minimum static capacity.
, the objective of the invention is to for this reason, a kind of variable capacitor that can as far as possible reduce minimum static capacity is provided by working hard in the shape of rotor electrode and stator electrode.
Summary of the invention
In order to achieve the above object, the invention provides a kind of variable capacitor, comprising having the stator that stator electrode and formation are used for covering the dielectric layer of this stator electrode, be configured on the said stator rotationally and protrude in its lower section in the variable capacitor of the conductivity rotor be formed with the rotor electrode that the surface with above-mentioned dielectric layer joins, it is characterized in that above-mentioned rotor electrode become transference rotor rotation centres slightly semicircular main electrode and with the electrode shape of rotor rotation centres and the slightly semicircular auxiliary electrode subtend integrated formation littler than main electrode radius, and the said stator electrode become along with the rotation of above-mentioned rotor by dielectric layer can with above-mentioned main electrode subtend and with above-mentioned turned position irrelevant not can with the shape of above-mentioned auxiliary electrode subtend, left-right symmetric forms states stator electrode to some extent, described stator electrode comprises that the center of rotation that has with rotor is the counter electrode portion of circular-arc inner peripheral at center and the extraction electrode portion of drawing at the both ends of the long side direction of stator, on the both ends lateral surface of the long side direction of stator, be formed with respectively the stator terminal that constitutes with conducting film that the extraction electrode portion of these stator electrodes becomes to be electrically connected.
The rotor electrode that below rotor, forms, owing to be to allow the rotor electrode of the integrated formation of semicircle auxiliary electrode subtend of the semicircle main electrode of long radius and minor radius, so the inclination that the minor radius auxiliary electrode can restrict rotor, and keep with the stator dielectric layer is stable and contact.In addition, in order to obtain minimum static capacity, when main electrode turns to not on the position with the stator electrode subtend, allow auxiliary electrode also not with stator electrode subtend, its minimum direct capacitance value and comparing and can reduce in the past.For this reason, can obtain to enlarge the variable capacitor of the variable range of direct capacitance value.
In addition, the shape of main electrode and auxiliary electrode, it is semicircle completely there is no need, even have concavo-convexly on outer peripheral face, sees it is that radius gets final product basically on the whole.
Another kind of variable capacitor of the present invention, be in above-mentioned variable capacitor, allowing stator electrode have with the rotor rotation center is the shape of center, the circular-arc inner peripheral little and bigger than the outer peripheral edges radius of auxiliary electrode than the outer peripheral edges portion radius of the main electrode of rotor electrode.At this moment, main electrode can with the stator electrode subtend, and auxiliary electrode not relative always with stator electrode to.And the main electrode of rotor electrode and the subtend area continuous variable between the stator electrode are so along with the rotation of rotor, can improve the linearity of the variation of direct capacitance value.
Another kind of variable capacitor of the present invention, be in above-mentioned variable capacitor, variable capacitor further comprises the spring assembly that above-mentioned rotor electrode is crimped on the limit face of dielectric layer, and it is the circular press section at center by being pressed in the rotor rotation center that spring assembly has the top of rotor.
That is and since the press section of spring assembly circular by be pressed in rotor above, so can stablize contact between rotor and the stator, suppress the inclination of rotor.
In addition, another kind of variable capacitor of the present invention is in above-mentioned variable capacitor, is formed with to adjust with the chimeric embeded slot of instrument on rotor, and the auxiliary electrode of rotor electrode has the diameter bigger than the longest dimension of embeded slot.That is, if the full-size of the diameter of auxiliary electrode and embeded slot is identical or than its hour, embeded slot penetrates into the bottom surface of rotor, the thickness between the bottom of embeded slot and the peripheral part of auxiliary electrode reduces, and might reduce the intensity of rotor.To this, by making the diameter of auxiliary electrode bigger than the longest dimension of embeded slot, can guarantee has given thickness between the peripheral part of the bottom of embeded slot and auxiliary electrode, prevents that the intensity of rotor from reducing.
Description of drawings
Fig. 1 is the sectional view of expression one example variable capacitor in the past.
Fig. 2 is the vertical view that is illustrated in the stator electrode shape in the variable capacitor of Fig. 1.
Fig. 3 is the upward view that is illustrated in the rotor in the variable capacitor of Fig. 1.
Fig. 4 for the expression a routine variable capacitor of the present invention oblique view.
Fig. 5 is vertical view, front view, upward view and the right view of expression variable capacitor shown in Figure 4.
Fig. 6 is the sectional view of expression along the X-X line of Fig. 5.
Fig. 7 is the vertical view that is illustrated in the stator electrode shape in the variable capacitor of Fig. 4.
Fig. 8 is the upward view that is illustrated in the rotor in the variable capacitor of Fig. 4.
Fig. 9 is the comparison diagram of expression the present invention and routine in the past minimum static capacity position.
Figure 10 is the comparison diagram of expression with respect to the capacitance value of the present invention and routine in the past rotor rotation angle.
Among the figure, B-variable capacitor, 20-stator, 21-stator electrode, 30-rotor, 31-main electrode, 32-auxiliary electrode, 40-lid.
Embodiment
Fig. 4～Fig. 8 is the embodiment of the relevant variable capacitor B of the present invention of expression.
This variable capacitor B roughly comprises stator 20, rotor 40 and lid 40.
The major part of stator 20 is made of ceramic dielectric, and integral body is that rectangle is tabular.Inner near the skin section of stator 20, as shown in Figure 7, left-right symmetric forms stator electrode 21,22. Stator electrode 21,22 comprises that the center of rotation 0 that has with rotor 30 is the 21a of counter electrode portion, the 22a of circular-arc inner peripheral at center and the 21b of extraction electrode portion, the 22b that draws at the both ends of the long side direction of stator 20.On the both ends lateral surface of the long side direction of stator 20, be formed with respectively the stator terminal 23,24 that constitutes with conducting film that the 21b of extraction electrode portion, the 22b of these stator electrodes 21,22 become to be electrically connected.In the skin section of stator 20, form the dielectric layer 25 have dielectric one one and covering stator electrode 21,22.
On stator 20, form 21,22 and two stator terminal the 23, the 24th of two stator electrodes of left-right symmetric shape, in order to allow stator 20 not have directivity.At this moment, stator electrode 22 that is connected with lid terminal 47 and stator terminal 24 are dummy electrode and virtual terminal.If do not eliminate necessity of directivity, also can omit in the stator electrode 21,22 and the stator terminal 23,24.
Lid 40 cover rotor 30 above, be fixed on simultaneously on the stator 20, for example constitute by rubber-like conductive metal such as stainless steel or bronze.This lid 40 is provided with the outer peripheral face of support rotor 30 and can allows the cylindric cover section 41 of its rotation.In addition, be formed with the window 42 that allows the embeded slot 33 of rotor 30 expose on the top of lid 40.
Around window 42, be provided with and push the top of rotor 30 and be used to allow the spring action portion 43 of rotor 30 to stator 20 crimping.Spring action portion 43 around window 42, is the horn shape that tilts downwards toward the center.Inner peripheral portion in spring action portion 43 uniformly-spaced is formed with a plurality of (being 3 the herein) press section 44 of protruding downwards at circumferencial direction, and these press sections 44 are essentially a contact on rotor 30.Press section 44 preferably constitutes and pushes in fact with the outer peripheral edges of auxiliary electrode 32 at the radial direction of rotor 30 is parts of same radius.
In the both sides of lid 40, be provided with along the two sides of the long side of stator 20 and extend the clamping pawl 45,46 of lateral bending song below stator 20 downwards.At the medial surface of these clamping pawls 45,46, form promising and the side of stator 20 between interstitial protuberance 45a, 46a.On lid 40, be wholely set the lid terminal 47 that extends along a side of the short brink of stator 20 downwards.Form the expanding section 47a that expands laterally at lid terminal 47 midway.Lid terminal 47 with the position that is arranged on stator terminal 24 subtends on the stator 20 on extend, by between lid terminal 47 and stator terminal 24, injecting scolding tin (figure does not draw) lid 40 and stator 20 are fixedly secured, can allow stator terminal 24 simultaneously as 47 effects of lid terminal.
Under the assembled state of variable capacitor B, as shown in Figure 6, the main electrode 31 of rotor 30 produces static capacity by the dielectric layer 25 and stator electrode 21 subtends of stator 20.Again, because auxiliary electrode 32 is littler than the internal diameter of stator electrode 21, no matter rotor rotation is where, not can with stator electrode 21 subtends.If rotor 30 is rotated, the effective subtend area change between main electrode 31 and the stator electrode 21 can allow static capacity change.If rotary rotor by main electrode 31 and stator electrode 21 places with fully not on the position of subtend, its static capacity minimum, at this moment stator electrode 21 subtends because auxiliary electrode 32 is also got along well, minimum static capacity is than can further reduce in the past.Static capacity, the stator terminal 23 that is electrically connected with stator electrode 21 and be electrically connected with rotor 30 with main electrode 31 be arranged on output between the lid terminal 47 on the lid 40.
Fig. 9 is relevant variable capacitor B of the present invention of expression and the minimum static capacity position of routine variable capacitor A in the past.In routine in the past variable capacitor A,, can not reduce minimum direct capacitance value because the protuberance 12 and stator electrode 5 subtends of rotor 3 produce capacitance at this subtend position.To this, in variable capacitor B of the present invention, because main electrode 31 but also auxiliary electrode 32 stator electrode 21 subtends of also getting along well not only can reduce capacitance in Min. ground.
Figure 10 is the variation of expression with respect to the capacitance value of the rotational angle of rotor, and B of the present invention compares with routine A in the past.At this, allow the maximum capacitor value of two capacitor A, B equate.
Show that by Figure 10 in routine in the past variable capacitor A, minimum direct capacitance value can not be lower than 1.0pF, and can be reduced to 0.5pF in variable capacitor B of the present invention.Its result can obtain to have enlarged the variable capacitor of variable adjusting range.
Under the situation of this variable capacitor, its maximum electrostatic capability value, for example the method for the thickness by dwindling dielectric layer 25 can realize than being easier to.And minimum direct capacitance value is owing to determined by the rotor electrode 31,32 of rotor 30 and the subtend area of stator electrode 21, need only these electrodes relatively to, just can not adjust to below a certain value.In the present invention, on minimum static capacity position, rotor electrode 31,32 and stator electrode 21 be subtend not fully, so minimum static capacity can be minimized.
The present invention is not limited to embodiment as described above, as long as in the scope that does not break away from spirit of the present invention, can carry out various distortion.
In illustrated embodiment, though the structure of stator 20 is to be made of dielectric, portion forms stator electrode 21 and 22 within it, and form on its outer surface and have the stator terminal 23 and 24 of conducting film, also can on stator external surface, form stator electrode, dielectric and stator adopt different parts to form, and stator electrode and stator terminal are made of metallic plate etc.
Though variable capacitor of the present invention is installed on the stator and has adopted lid for rotor is pushed, also can substitute lid and rotor is pushed be installed on the stator with other spring members.
Further, in illustrated embodiment, though in the spring action portion 43 of lid 40, formed the press section 44 of convex shape, this press section 44 be in direct contact with rotor 30 above, also can spring action portion 43 and rotor 30 between the conductivity packing ring of packing into.
In addition, it is the center that stator electrode 21 is not limited to have with rotor rotation center 0, outer peripheral edges radius than main electrode 31 is little, and the electrode of the circular-arc inner peripheral bigger than the outer peripheral edges radius of auxiliary electrode 32, so long as can with the main electrode subtend, and do not get final product with the shape of auxiliary electrode subtend.
More than explanation shows, according to the present invention, owing to allow the semicircle auxiliary electrode subtend of the semicircle main electrode of long radius and minor radius and integrally formed rotor electrode, the inclination that auxiliary electrode can restrict rotor keeps with the stator dielectric layer is stable contacting.In addition, since stator electrode by dielectric layer can with the main electrode subtend, and not with the auxiliary electrode subtend, in order to obtain minimum static capacity, when main electrode turns to not on the position with the stator electrode subtend, allow auxiliary electrode also not with the stator electrode subtend, so its minimum direct capacitance value and comparing and can reduce in the past.For this reason, can obtain to enlarge the variable capacitor of the variable range of direct capacitance value.
Claims (4)
1. variable capacitor, comprise have stator electrode and formation be used for covering this stator electrode dielectric layer stator and be configured on the described stator rotationally and protrude the conductivity rotor that is formed with the rotor electrode that the surface with described dielectric layer joins in its lower section, it is characterized in that:
Described rotor electrode become the slightly semicircular main electrode of transference rotor rotation centres and with the rotor rotation centres and than the little slightly semicircular auxiliary electrode subtend of main electrode radius and the electrode shape of integrated formation;
And described stator electrode have along with the rotation of described rotor by dielectric layer can with described main electrode subtend, and with described turned position irrelevant not can with the shape of described auxiliary electrode subtend, left-right symmetric forms states stator electrode to some extent, described stator electrode comprises that the center of rotation that has with rotor is the counter electrode portion of circular-arc inner peripheral at center and the extraction electrode portion of drawing at the both ends of the long side direction of stator, on the both ends lateral surface of the long side direction of stator, be formed with respectively the stator terminal that constitutes with conducting film that the extraction electrode portion of these stator electrodes becomes to be electrically connected.
2. variable capacitor according to claim 1 is characterized in that it is the center with little and bigger than the outer peripheral edges radius of the auxiliary electrode circular-arc inner peripheral of outer peripheral edges portion radius than the main electrode of rotor electrode that described stator electrode has with described rotor rotation center.
3. variable capacitor according to claim 1 and 2 is characterized in that described variable capacitor further comprises the spring assembly that described rotor electrode is crimped on the surface of dielectric layer,
It is the circular press section at center by being pressed in the rotor rotation center that described spring assembly has the top of described rotor.
4. variable capacitor according to claim 1 and 2 is characterized in that being formed with on described rotor and adjusts with the chimeric embeded slot of instrument, and the auxiliary electrode of described rotor electrode has the diameter bigger than the longest dimension of described embeded slot.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000274371A JP2002083736A (en) | 2000-09-11 | 2000-09-11 | Variable capacitor |
| JP2000274371 | 2000-09-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1343997A CN1343997A (en) | 2002-04-10 |
| CN1204576C true CN1204576C (en) | 2005-06-01 |
Family
ID=18760137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011236922A Expired - Fee Related CN1204576C (en) | 2000-09-11 | 2001-09-11 | Variable capacitor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2002083736A (en) |
| KR (1) | KR100463774B1 (en) |
| CN (1) | CN1204576C (en) |
| TW (1) | TW501153B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2888419B1 (en) * | 2005-07-08 | 2010-12-03 | Commissariat Energie Atomique | VARIABLE CAPACITY GENERATING DEVICE FOR GENERATING ELECTRIC ENERGY AND BALL BEARING MOTION ASSISTING DEVICE INCLUDING THE SAME |
| CN113035571B (en) * | 2021-03-14 | 2022-05-10 | 无锡鑫聚电子科技有限公司 | Capacitor with adjustable capacitance |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS605562Y2 (en) * | 1979-10-01 | 1985-02-21 | ティーディーケイ株式会社 | variable capacitor |
| JPS6133630Y2 (en) * | 1980-05-26 | 1986-10-01 | ||
| JPS5712738U (en) * | 1980-06-24 | 1982-01-22 | ||
| KR940003755Y1 (en) * | 1991-10-01 | 1994-06-09 | 조영창 | Variable condenser |
| JP3092539B2 (en) * | 1997-02-19 | 2000-09-25 | 株式会社村田製作所 | Variable capacitor and LC composite component using the same |
-
2000
- 2000-09-11 JP JP2000274371A patent/JP2002083736A/en active Pending
-
2001
- 2001-09-03 TW TW090121769A patent/TW501153B/en not_active IP Right Cessation
- 2001-09-10 KR KR10-2001-0055458A patent/KR100463774B1/en not_active IP Right Cessation
- 2001-09-11 CN CNB011236922A patent/CN1204576C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1343997A (en) | 2002-04-10 |
| JP2002083736A (en) | 2002-03-22 |
| KR20020020859A (en) | 2002-03-16 |
| KR100463774B1 (en) | 2004-12-29 |
| TW501153B (en) | 2002-09-01 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050601 |