CN1165060C - Variable capacitor - Google Patents
Variable capacitor Download PDFInfo
- Publication number
- CN1165060C CN1165060C CNB011206667A CN01120666A CN1165060C CN 1165060 C CN1165060 C CN 1165060C CN B011206667 A CNB011206667 A CN B011206667A CN 01120666 A CN01120666 A CN 01120666A CN 1165060 C CN1165060 C CN 1165060C
- Authority
- CN
- China
- Prior art keywords
- stator
- lid
- electrode
- scolding tin
- variable capacitor
- 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 - Lifetime
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 39
- 229910000679 solder Inorganic materials 0.000 claims abstract description 27
- 230000004907 flux Effects 0.000 claims abstract description 26
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 48
- 238000004381 surface treatment Methods 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000005476 soldering Methods 0.000 abstract description 9
- 239000003989 dielectric material Substances 0.000 abstract 1
- 229910052718 tin Inorganic materials 0.000 description 41
- 239000011135 tin Substances 0.000 description 41
- 238000012856 packing Methods 0.000 description 12
- 230000000630 rising effect Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- 241000220324 Pyrus Species 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 description 2
- 235000021017 pears Nutrition 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003068 static effect Effects 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
- H01G5/014—Housing; Encapsulation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Induction Machinery (AREA)
Abstract
The invention provides a variable capacitor where solder can be surely prevented from infiltrating into the inside of a cover by improving a shape of the cover. This variable capacitor is provided with a stator 2, having stator electrodes 5, 6 and stator terminals 7, 8 which are electrically connected with the stator electrodes, a rotor 3 which is arranged on the upper part of the stator 2 and is provided with a rotor electrode 11 facing the stator electrodes 5, 6 via dielectrics, and a conductive cover 4 having a cover terminal 18 for external connection which is electrically connected with the rotor electrode 11, fixed to the stator 2 so as to hold the rotor 3 rotatably to the stator 2 and stretched along a side surface of the stator 2 as far as the vicinity of a lower surface position of the stator 2. A protruded part 18a for reserve is formed in the middle part of the cover terminal 18, so that solder and flux S are prevented from infiltrating into the inside of the cover 4, when reflow soldering is performed.
Description
Technical field
The present invention relates to variable capacitor, relate in particular to by making moving plate change the chip-shaped variable capacitor of static capacity with respect to the stator rotation.
Background technology
What Te Kaiping 11-260666 communique was put down in writing is exactly this variable capacitor.Fig. 1～Fig. 3 represents the variable capacitor 1 of this communique record.
The major part of stator 2 is made up of ceramic dielectric, and it is tabular to be rectangle.Near the top layer of stator 2 inside is formed with the stator electrode 5,6 with left-right symmetric shape.Along being formed with the stator joint 7,8 formed by conducting film on the both ends lateral surface of the length direction of stator 2 and being electrically connected with stator electrode 5,6.In addition, the shape of 5,6 and two stator joints 7,8 of two stator electrodes all has the left-right symmetric of relative stator 2, therefore can eliminate the directivity of stator 2 when assembling variable capacitor 1.If do not need to consider to eliminate the directivity of stator 2, then can dispense some in the some and stator joint 7,8 in the stator electrode 5,6.
Below stator 2, extend inward from relative both side edges and to be formed with recess 9,10.Moving plate 3 is made up of metal materials such as brass, be placed in stator 2 above.Below moving plate 3, be formed with the rotor plate electrode with outstanding step 11 of about semicircle shape.In addition, below moving plate 3, be formed with protuberance 12, its height is identical with the height of rotor plate electrode 11, with the heeling condition of control moving plate 3.
On moving plate 3, be formed with instruments such as to insert screwdriver so that the driver slot 13 that moving plate 3 is rotated.Lid 4 is made up of the metal that stainless steel etc. has spring, covers the top of moving plate 3 and is fixed on the stator 2.Lid 4 make moving plate 3 relatively stator 2 be rotated.On lid 4, be formed with the window 14 that the driver slot 13 that makes moving plate 3 exposes.
Be provided with by conductivity packing ring 19 around the window 14 and be pressed in the top of moving plate 3 so that moving plate 3 is pressed to the spring action portion 15 of stator 2.Spring action portion 15 is formed with towards the center and downward-sloping taper around window 14.Extended to form a pair of sealed pawl 16,17 downwards in the both sides of lid 4.Sealed pawl 16,17 extends downwards along the two sides of the long side of stator 2, and is crooked then so that lock together with the recess 9,10 that forms below stator 2.
On lid 4 and the diverse location position that is provided with sealed pawl 16,17, extend downwards along the side of stator 2 and to be provided with incorporate cover tab 18.Cover tab 18 extends to the position relative with the stator joint that is provided with 8 on stator 2, by between these cover tab 18 and stator joint 8, adding scolding tin (not drawing among the figure), lid 4 and stator 2 are firmly linked together, and make stator joint 8 can bring into play the effect of cover tab 18.
Fig. 2 is the assembled state of variable capacitor 1.Rotor plate electrode 11 forms electrostatic capacitances by the top layer of the ceramic dielectric of formation stator 2 with respect to stator electrode 5.During rotation moving plate 3, rotor plate electrode 11 changes with respect to effective relative area of stator electrode 5, thereby can change electrostatic capacitance.This electrostatic capacitance and the stator joint 7 that is electrically connected of stator electrode 5 and by packing ring 19 and have output between the cover tab 18 on the lid 4 that the moving plate 3 of rotor plate electrode 11 is electrically connected.
In general, lid 4 is made by the metal with spring as stainless steel and so on.Stainless contact resistance is big and unstable, thereby influences the reliability of the electrical conductivity between the following and packing ring 19 of spring action portion 15 of lid 4.In addition, stainless steel is again the metal of scolding tin wettability difference, and is also poor with the scolding tin wettability of the cover tab 18 of lid 4 integral formings.Therefore, this variable capacitor 1 is on being installed to wire-printed circuit board PCB the time, and scolding tin is difficult to soak on cover tab 18, thus the reliability that influence is installed.
Therefore, in the above-mentioned communique,, improve the scolding tin wetting property, propose on a part of surface of lid 4, to carry out surface treatment (for example plating gold, silver, tin etc.) in order to reduce contact resistance.Preferably carry out surface treatment in the bottom surface of spring action portion 15 and the lateral surface of cover tab 18.If lid 4 carried out surface treatment comprehensively, as shown in Figure 2, when carrying out soldering, scolding tin S can be because capillarity and rise along the contact portion of the cover tab 18 of lid 4 and stator 2 and to enter into the inside of lid 4, moving plate 3 can be fixed by scolding tin S, solder flux can be invaded lid 4 and the contact portion of packing ring 19 or the contact portion of packing ring 19 and moving plate 3 simultaneously, thereby influences electrical conductivity.
But if only the part surface of lid 4 is carried out surface treatment, processing cost is very high, thereby has increased the cost of variable capacitor.In addition, only be surface treatment whether, also differing prevents that surely scolding tin S from invading the inside of lid 4.
Summary of the invention
The shape that technical problem solved by the invention provides by changing lid can prevent really that scolding tin from invading the variable capacitor of lid inside.
In order to achieve the above object, the present invention 1 provides a kind of variable capacitor, carry out the stator of the electric stator joint that contacts by having stator electrode and stator electrode therewith, the moving plate of the rotor plate electrode that has the top that is placed in above-mentioned stator and dispose in opposite directions by dielectric and above-mentioned stator electrode, have and carry out electric contact with above-mentioned rotor plate electrode and be fixed on the above-mentioned stator so that above-mentioned moving plate can be formed with respect to above-mentioned stator rotation and near the conductivity lid that is used for the outside cover tab that is connected that extends its lower position along the side of above-mentioned stator, it is characterized in that being formed with the expansion protuberance to retain scolding tin and solder flux in the way of cover tab of above-mentioned lid, when on lid, being provided with downwards by the crooked sealed pawl in stator side, can form projection on the medial surface of this sealed pawl so as and the stator side between form the gap.
In addition, the present invention 2 provides a kind of variable capacitor, carry out the stator of the electric stator joint that contacts by having stator electrode and stator electrode therewith, the moving plate of the rotor plate electrode that has the top that is placed in above-mentioned stator and dispose in opposite directions by dielectric and above-mentioned stator electrode, have and carry out electric contact with above-mentioned rotor plate electrode and be fixed on the above-mentioned stator so that above-mentioned moving plate can be formed with respect to above-mentioned stator rotation and near the conductivity lid that is used for the outside cover tab that is connected that extends its lower position along the side of above-mentioned stator, it is characterized in that above-mentioned cover tab with above-mentioned stator side opposed inside face on be formed with jog or ditch portion, when on lid, being provided with downwards by the crooked sealed pawl in stator side, can form projection on the medial surface of this sealed pawl so as and the stator side between form the gap.
In addition; the present invention 3 provides a kind of variable capacitor; carry out the stator of the electric stator joint that contacts by having stator electrode and stator electrode therewith; the moving plate of the rotor plate electrode that has the top that is placed in above-mentioned stator and dispose in opposite directions by dielectric and above-mentioned stator electrode; have and carry out electric contact with above-mentioned rotor plate electrode and be fixed on the above-mentioned stator so that above-mentioned moving plate can be formed with respect to above-mentioned stator rotation and near the conductivity lid that is used for the outside cover tab that is connected that extends its lower position along the side of above-mentioned stator, it is characterized in that above-mentioned cover tab with above-mentioned stator side opposed inside face on be formed with the diaphragm that forms by fluorine resin.
Near the cover tab integrated formation on lid that is used for outside connection of extending its lower position along the stator side, cover tab and stator are in contact condition substantially.Therefore, when variable capacitor was installed on the wire-printed circuit board by soldering, scolding tin or solder flux can enter into the inside of lid from rising between cover tab and the stator owing to capillarity.
So, among the present invention 1, be formed with the expansion protuberance in the way of cover tab to retain scolding tin and solder flux, this expansion protuberance can stop scolding tin or solder flux to rise, thereby eliminates that moving plate is fixed by scolding tin and solder flux invades the contact portion of the contact portion of lid and packing ring or packing ring and moving plate and causes problem such as electric loose contact.
As long as the shape of expansion protuberance can guarantee to retain scolding tin or solder flux between stator, can obtain by cover tab is carried out simple bending machining.
Among the present invention 2, replace the present invention 1 expansion protuberance, and cover tab with above-mentioned stator side opposed inside face on be formed with jog or ditch portion.Owing to jog or ditch portion produce the space, thereby can suppress the scolding tin that produces owing to capillarity or the rising of solder flux.
Among the present invention 3, in order to prevent because the scolding tin that causes of capillarity or the intrusion of solder flux, above-mentioned cover tab with above-mentioned stator side opposed inside face on be formed with diaphragm.This moment, diaphragm can suppress the rising of scolding tin or solder flux, prevented that it from invading lid inside.
In the present invention 1 to 3, made because lid is the metal of scolding tin wetting property difference as described in the present invention 4, all carry out surface treatment to improve the scolding tin wetting property so wish the integral body of above-mentioned lid.In the present invention promptly, there is no need only the part of lid to be carried out surface treatment, can carry out surface treatment the integral body of lid.Even because lid integral body is carried out surface treatment, expansion protuberance, jog, diaphragm etc. also can limit scolding tin or solder flux because the intrusion that capillarity produces.So, compare with the situation of carrying out the part surface processing, can cut down finished cost, obtain cheap variable capacitor.
As described herein, when on lid, being provided with downwards by the crooked sealed pawl in stator side, can form projection on the medial surface of this sealed pawl so as and the stator side between form the gap.Promptly when being formed with sealed pawl on the lid, the medial surface of sealed pawl and stator side are in contact condition substantially, and scolding tin or solder flux may be invaded lid inside by being drunk up between sealed pawl and the stator during soldering.Like this, if be formed with the gap that can suppress capillarity between sealed pawl and the stator, just can suppress the intrusion of scolding tin or solder flux.
Description of drawings
Following brief description accompanying drawing and symbol.
Fig. 1 is vertical view, front view, upward view and the right side view of an example of variable capacitor in the past.
Fig. 2 is the cutaway view along the X-X line of Fig. 1.
Fig. 3 is the stereogram after the part of the variable capacitor of Fig. 1 is removed.
Fig. 4 is vertical view, front view, upward view and the right side view of an example of variable capacitor of the present invention.
Fig. 5 is the enlarged drawing of a part of the variable capacitor of Fig. 4.
Fig. 6 is the front view of the part of the 2nd execution mode of the present invention.
Fig. 7 is the cutaway view along the VII-VII line of Fig. 6.
Fig. 8 is the end view of the cover tab of the variation of observed variable capacitor as shown in Figure 6 from the inboard.
Fig. 9 is the front view of the part of the 3rd execution mode of the present invention.。
Wherein symbol description is as follows among the figure.
1 '-variable capacitor; The 2-stator; The 3-moving plate; The 4-lid; 5,6-stator electrode; 7,8-stator joint; The 11-rotor plate electrode; 16a, the 17a-projection; The 18-cover tab; 18a-expansion protuberance; 20-liquid retention portion; The 18b-ditch; 18c, the 18d-jog; The 21-diaphragm.
Embodiment
Fig. 4 and Fig. 5 represent the execution mode 1 of variable capacitor 1 ' of the present invention.The basic structure of this execution mode is identical with the illustrated variable capacitor 1 that sees figures.1.and.2, and the part identical with variable capacitor 1 also adopts same-sign to represent, so save repeat specification.
With the way of the cover tab 18 of lid 4 integral formings in, be formed with the expansion protuberance 18a of outside expansion, between this expansion protuberance 18a and stator 2, be formed with liquid and retain portion 20.Expansion protuberance 18a in this example be in the parallel portion of above stator 2, extending of cover tab 18 and the vertical component effect that extends along the side of stator 2 between.When expansion protuberance 18a forms in this position, can not hinder the miniaturization of variable capacitor.If do not consider the miniaturization issues of variable capacitor, the expansion protuberance also can be arranged on the vertical component effect.When variable capacitor was of a size of 2mm, size L up and down, H that liquid retains portion 20 wished to be L 〉=0.15mm, H 〉=0.20mm.
In addition, the both sides of lid 4 are provided with and extend downwards along the two sides of the long side of stator 2 and the sealed pawl 16,17 of bending below stator 2.On the medial surface of these sealed pawls 16,17, be formed with projection 16a, 17a, so as and stator 2 between form gap (with reference to the right side view of Fig. 4).The height of projection 16a, 17a is wished greater than 0.07mm.
As mentioned above, the integral body of lid 4 is through surface treatment, thereby improved the conduction reliability between the following and packing ring 19 of spring action portion 15 of lid 4.In addition, when this variable capacitor 1 ' was installed on the wire-printed circuit board PCB by soldering, scolding tin soaked on cover tab 18 easily, has improved installation reliability.But when if the coated weight of fusion scolding tin is too many, as shown in Figure 2, scolding tin or solder flux may rise between cover tab 18 and stator 2 because of capillarity, invade the inside of lid 4.
But, owing in the way of cover tab 18, form expansion protuberance 18a, be formed with liquid between expansion protuberance 18a and the stator 2 and retain portion 20, as shown in Figure 5, scolding tin R or solder flux can rest on liquid and retain portion 20, can not continue to invade the inside of lid 4.
Equally, scolding tin or solder flux may rise between sealed pawl 16,17 and stator 2 sides because of capillarity during soldering, and the medial surface owing to be formed with projection 16a, 17a at sealed pawl 16,17 forms the space, can prevent the rising of scolding tin or solder flux.
Fig. 6 and Fig. 7 are embodiments of the present invention 2.
In this execution mode, on the cover tab 18 of lid 4 and side stator 2 opposed inside face, as shown in Figure 7, broad ways has been processed many ditch 18b.The spacing of ditch 18b is about 0.1mm, and the degree of depth of ditch 18b is 0.02～0.05mm.
Medial surface by cover tab 18 forms ditch 18b, and the rising meeting of scolding tin that produces owing to capillarity when soldering or solder flux is stoped by many ditch 18b, thereby can suppress the inside that it invades lid 4.
Fig. 8 is the variation of execution mode 2.
Broad ways is formed with ditch 18b among Fig. 7.Replace these ditches and form netted jog 18c shown in Fig. 8 (a), or the jog 18d of the pears skin shape shown in Fig. 8 (b) also can obtain same effect.
At this moment, netted or pears skin shape spacing is divided into about 0.1mm, and the degree of depth of jog 18c, 18d is 0.02～0.05mm.
Fig. 9 is embodiments of the present invention 3.
In this execution mode, on the cover tab 18 of lid 4 and side stator 2 opposed inside face, be formed with the diaphragm 21 that fluorine resin is made.In addition, wish that diaphragm 21 not only is formed on relative part with the side of stator 2, and can continue up to the top relative part with stator 2.
At this moment, by form diaphragm 21 on the medial surface of cover tab 18, the protected film 21 of rising meeting of scolding tin that produces owing to capillarity during soldering or solder flux stops, thereby can suppress the inside that it invades lid 4.Also have, 21 of diaphragms form on the medial surface of cover tab 18, and the lateral surface of cover tab 18 is soaked into by scolding tin easily, can not reduce the reliability of installation.Certainly the surperficial integral body of lid 4 is all passed through surface treatment at this moment.
The present invention not only is confined to above-mentioned execution mode, in the scope that does not exceed purpose of the present invention various variation can also be arranged.
For example, in the execution mode of Fig. 6～shown in Figure 9,, can certainly form expansion protuberance 18a though there is not to form as shown in Figure 4 and Figure 5 expansion protuberance 18a in the cover tab 18.
In illustrated embodiment, moving plate 3 is made by conductive metal.Moving plate also can be made by insulators such as aluminium oxide, partly forms conductor in necessity then.
In addition, in illustrated embodiment, stator 2 is made for dielectric, and portion forms stator electrode 5 and 6 within it, forms the stator joint 7 and 8 with conducting film at its outer surface then.What replace this structure is, forms the stator electrode at the outer surface of stator, and utilizes other material to form dielectric, or make the stator joint with metallic plate etc.
Also have, in illustrated embodiment, the spring action portion 15 of lid 4 contacts with the top of moving plate 3 by the packing ring 20 of conductivity, thereby guarantees to be electrically connected.Also can omit packing ring 20, and allow spring action portion 15 directly contact with the top of moving plate 3.
As seen from the above description, according to the present invention 1, be formed with the expansion protuberance of retaining scolding tin or solder flux in the way of the cover tab of lid, when on lid, being provided with downwards by the crooked sealed pawl in stator side, can form projection on the medial surface of this sealed pawl so as and the stator side between form the gap, the scolding tin that produces owing to capillarity when soldering or the rising of solder flux can be inflated protuberance and stop.So, can eliminate moving plate and be fixed by scolding tin, solder flux is invaded the loose contact that lid and the contact portion or the packing ring of packing ring produce with the contact portion of moving plate etc. and is electrically connected problem.
Also have, according to according to the present invention 2, cover tab with stator side medial surface in opposite directions on be formed with jog or ditch portion, identical with the present invention 1, jog or ditch portion can stop the rising of scolding tin or solder flux, stop it to invade lid inside.
In addition, in the present invention 3, cover tab with stator side opposed inside face on be formed with diaphragm, can stop scolding tin or solder flux to invade lid inside.Also have, do not have diaphragm on the lateral surface of cover tab, so can not hinder the wettability of cover tab to scolding tin.
Claims (7)
1. variable capacitor, by have stator electrode and stator electrode therewith carry out the stator joint of electric contact stator, have the top that is placed in above-mentioned stator and the moving plate of the rotor plate electrode that disposes in opposite directions by dielectric and above-mentioned stator electrode, have and carry out electric contact with above-mentioned rotor plate electrode and be fixed on the above-mentioned stator so that above-mentioned moving plate can be formed with respect to above-mentioned stator rotation and near the conductivity lid that is used for the outside cover tab that is connected that extends its lower position along the side of above-mentioned stator, it is characterized in that:
Be formed with the expansion protuberance in the way of the cover tab of described lid to retain scolding tin and solder flux, on described lid, be provided with by the crooked downwards and sealed sealed pawl in described stator side, form projection on the medial surface of this sealed pawl so as and described stator side between form the gap.
2. variable capacitor, by have stator electrode and stator electrode therewith carry out the stator joint of electric contact stator, have the top that is placed in described stator and the moving plate of the rotor plate electrode that disposes in opposite directions by dielectric and described stator electrode, have and carry out electric contact with described rotor plate electrode and be fixed on the described stator so that described moving plate can be formed with respect to described stator rotation and near the conductivity lid that is used for the outside cover tab that is connected that extends its lower position along the side of described stator, it is characterized in that:
Described cover tab with described stator side opposed inside face on be formed with jog or ditch portion, on described lid, be provided with by the crooked downwards and sealed sealed pawl in described stator side, form projection on the medial surface of this sealed pawl so as and described stator side between form the gap.
3. variable capacitor, by have stator electrode and stator electrode therewith carry out the stator joint of electric contact stator, have the top that is placed in described stator and the moving plate of the rotor plate electrode that disposes in opposite directions by dielectric and described stator electrode, have and carry out electric contact with described rotor plate electrode and be fixed on the described stator so that described moving plate can be formed with respect to described stator rotation and near the conductivity lid that is used for the outside cover tab that is connected that extends its lower position along the side of described stator, it is characterized in that:
Described cover tab with described stator side opposed inside face on be formed with the diaphragm that forms by fluorine resin.
4. variable capacitor according to claim 1 is characterized in that:
Described lid is made by the metal of scolding tin wettability difference, has carried out surface treatment on the whole to improve its scolding tin wettability at described lid.
5. variable capacitor according to claim 2 is characterized in that:
Described lid is made by the metal of scolding tin wettability difference, has carried out surface treatment on the whole to improve its scolding tin wettability at described lid.
6. variable capacitor according to claim 3 is characterized in that:
Described lid is made by the metal of scolding tin wettability difference, has carried out surface treatment on the whole to improve its scolding tin wettability at described lid.
7. according to claim 3 or 6 described variable capacitors, it is characterized in that:
On described lid, be provided with by the crooked downwards and sealed sealed pawl in described stator side, form projection on the medial surface of this sealed pawl so as and described stator side between form the gap.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP221571/2000 | 2000-07-24 | ||
| JP2000221571 | 2000-07-24 | ||
| JP2000221571A JP3711845B2 (en) | 2000-07-24 | 2000-07-24 | Variable capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1334576A CN1334576A (en) | 2002-02-06 |
| CN1165060C true CN1165060C (en) | 2004-09-01 |
Family
ID=18715946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011206667A Expired - Lifetime CN1165060C (en) | 2000-07-24 | 2001-07-24 | Variable capacitor |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3711845B2 (en) |
| KR (1) | KR100438516B1 (en) |
| CN (1) | CN1165060C (en) |
| TW (1) | TW523766B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3940063B2 (en) * | 2002-11-20 | 2007-07-04 | 松下電器産業株式会社 | Variable capacitance element and integrated circuit incorporating variable capacitance element |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05275288A (en) * | 1992-03-30 | 1993-10-22 | Nec Toyama Ltd | Chip type solid electrolytic capacitor |
| JP3111916B2 (en) * | 1996-12-20 | 2000-11-27 | 株式会社村田製作所 | Variable capacitor |
| JP3387383B2 (en) * | 1997-09-08 | 2003-03-17 | 株式会社村田製作所 | Variable capacitor |
| JP4019541B2 (en) * | 1999-03-15 | 2007-12-12 | ミツミ電機株式会社 | Chip capacitor device |
-
2000
- 2000-07-24 JP JP2000221571A patent/JP3711845B2/en not_active Expired - Lifetime
-
2001
- 2001-07-13 TW TW090117186A patent/TW523766B/en not_active IP Right Cessation
- 2001-07-24 KR KR10-2001-0044466A patent/KR100438516B1/en active IP Right Grant
- 2001-07-24 CN CNB011206667A patent/CN1165060C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002043173A (en) | 2002-02-08 |
| KR100438516B1 (en) | 2004-07-03 |
| CN1334576A (en) | 2002-02-06 |
| KR20020008799A (en) | 2002-01-31 |
| JP3711845B2 (en) | 2005-11-02 |
| TW523766B (en) | 2003-03-11 |
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