CN1176473A - Variable capacitor and inductance-capacitance component using the variable capacitor - Google Patents

Abstract

To provide an LC assembly with better shielding effect and anti-contamination performance, which can use a variable capacitor with excellent reliability of a moving plate, etc., while reducing complexity and size. The LC assembly comprises a substrate (27) on which two separate stator-side electrodes are arranged on a main plane. A dielectric moving piece (40) is formed on the top surface of the moving piece in contact with electrodes on the side of the moving piece and electrodes on the side of the fixed piece. A regulator (44) is rotatably mounted on the substrate (27), and a skirt (46) of it is in contact with the substrate. The moving piece (40) is accommodated in the skirt (46), and an O-ring (51) is set between the moving piece (40) and the adjusting piece (44) to support the moving piece (40) at the same time, so that it and substrate contact. An opening (55) is provided for exposing the adjusting groove (48), a shielding cover (54) is connected with the substrate, and the adjusting part (44) and the coil (23) are accommodated in the cover.

Description

The inductance-capacitance assembly of variable capacitor and this variable capacitor of application

The present invention relates generally to microelectronics, relate in particular to the LC assembling device of variable capacitor and this variable capacitor of application.The invention still further relates to the improvement of the moving plate supporting construction of using with variable capacitor.

Known systems LC assembling device or assembly are presented among Figure 15 and Figure 16, by label 1 expression.The assembly of this prior art has an equivalent electric circuit, is shown among Figure 17.LC set up jointly part be suitable as in electronic components and radio frequency (RF) modulator be applied to special electronic product together, comprising that video recording is usherd to seat, TV receiving system or the like.

As shown in figure 17, LC assembly 1 is in series by a variable capacitor 2 and a coil 3 in fact.One end of variable capacitor 2 is connected with first terminal 4, and the other end that is connected to coil 3 one ends is connected with second terminal 5.The other end of coil 3 links to each other with the 3rd terminal 6.

As Figure 15 and shown in Figure 16, LC assembly 1 has a dielectric substrates 7.Variable capacitor 2 in the LC assembly 1 be one with the air core capacitor of air as main dielectric material.Capacitor 2 has a moving plate 8 and a stator 9, and they are all supported by substrate 7.

Say in particular, mainly by making through the metal of selecting, it has the moving plate lateral electrode of a regulating shaft 10 and a plurality of reservation shape (for example, semicircle) to moving plate 8, and they protrude outwardly from regulating shaft 10.Regulating shaft 10 extensions penetrate substrate 7.Axle 10 is clipped on the lower surface of substrate 7 with a spring washer 12 and a stopper ring 13, allow axle 10 rotatably is contained on the substrate 7 with the joint that guarantees axle 10 lower skirt.The first terminal 4 has a base plate 14, and it is installed between substrate 7 and the spring washer 12, thereby when substrate 7 and moving plate 8 electrical interconnection are provided, guarantees that the solid mechanical of 4 pairs of substrates 7 of the first terminal supports.Have a regulating tank 15 in the regulating shaft upper end, it and an adjustment means, (screwdriver as is known) engages.Generally, moving plate 8 is one-piece parts parts of making of cutting technology.

Stator 9 has a plurality of stator lateral electrodes 16 and a plurality of pad 17, and each pad all is inserted between two contiguous electrodes.Second terminal 5 has a cylindrical bar that is installed on the substrate 7, and it passes substrate and penetrates the electrode 16 and the pad 17 of stator side.Electrode 16 and pad 17 by being welded to connect at second terminal, 5 places, thereby they are fixedlyed connected and electrical interconnection with terminal 5.Like this stator lateral electrode 16 of placing is in the space of each that determine between being inserted in them corresponding to adjacent moving plate lateral electrode 11 when moving plate 8 rotations.

Take such structure, variable capacitor 2 can make moving plate lateral electrode 11 and stator lateral electrode 16 face mutually, and has an air gap to be present between adjacent two electrodes, forms an electrostatic capacitance, from taking out this electric capacity between the first terminal 4 and second terminal 5.When driving moving plate 8 rotations, can change the folded zone of net weight of moving plate lateral electrode 11 and stator lateral electrode 16, thereby change final electrostatic capacitance value.

Coil 3 is air core coils, an end and stator 9 welding, and an other end passes substrate 7 and forms above-mentioned the 3rd terminal.Therefore the LC assembly has just been made, and as shown in figure 17, comprises variable capacitor 2 and second terminal 5 that links to each other with coil 3 one ends, in addition the 3rd terminal 6 that links to each other with an other end of coil 3.

The LC assembly of prior art also comprises a radome 18, and it is connected with substrate 7, and the inside accommodates variable capacitor 2 and coil 3.Radome 18 has an opening 19, allows the regulating tank 15 of regulating shaft 10 expose.

Regrettably, the LC modular construction of prior art especially about the structure of variable capacitor 2, has run into several problems.

The assembly that problem is a prior art is influenced because of the existence of environment stray capacitance.This is air owing to variable capacitor 2 used main dielectric materials.In order to obtain required electrostatic capacitance value, air capacitor structure itself requires to increase the overlapping region between moving plate lateral electrode 11 and the stator lateral electrode 16, this can reduce stability and reliability, makes capacitor be easy to be subjected to being present in the adverse effect of on every side spuious or parasitic capacitance.

Another problem that prior art runs into is because following reason has reduced the pollution-proof performance and the environmental sealing performance of radome 18: the LC assembly 1 of prior art has also had aspect the location of regulating shaft 10 by standardization in the design of outer dimension and terminal 4-6.If when therefore especially regulating shaft 10 being placed a precalculated position, increase the area of each moving plate lateral electrode as previously mentioned, then the design of device may make moving plate lateral electrode 11 oversize at a certain position of rotation place, to such an extent as in the radome 18 to outside protrude out.For eliminating this situation, shielding is covered with a window 20 and allows this of moving plate lateral electrode 11 outwards to protrude out.On cover 18, add environmental sealing performance and the pollution-proof performance that this window 20 has reduced LC assembly 1 very unfriendly.

The another one problem of prior art is owing to increased the complexity of structure, can not reduce production costs.A reason of this respect is normally to handle by cutting to make the regulating shaft 10 that uses together with moving plate lateral electrode 11.The another one reason be that in order to obtain stator lateral electrode 16, the increase of part number also increases the complexity of entire device.

Prior art has a problem to be again, corrosion and pollution take place because of sliding contacting part divides, electrical interconnection is degenerated, and this sliding contacting part branch comprises with the base plate 14 of terminal 4, electrically contacts at the regulating shaft 10 of the extension of driven disc lateral electrode 11 in the conductive path of the first terminal 4 and/or the slip of spring washer 12.

Prior art has a problem to be again, if regulating shaft has tilted in the capacitance adjustment process, then the air gap thickness between moving plate lateral electrode 11 and the stator lateral electrode 16 can change, thereby causes that final capacitance takes place by corresponding the variation, and this makes capacitance adjustment difficulty more again.

An object of the present invention is to provide a kind of structure that can avoid the LC assembling device of the problem that prior art runs into.

Another object of the present invention provides a kind of improved capacitor and uses the LC assembling device of this variable capacitor.

Another purpose of the present invention provides a kind of LC assembly of improved variable capacitance, when reducing complexity and size, has better environmental sealing and anti fouling performance.

In order to achieve the above object, the invention provides a kind of variable capacitor, this capacitor comprises an insulating substrate, is formed with the first and second moving plate lateral electrodes that separate on a primary flat of substrate.Placing one is contacted with the first and second stator lateral electrodes by the moving plate of making through the dielectric substance of selecting.One or more moving plate lateral electrodes are fixed by moving plate, so that the moving plate that is between the two stator lateral electrodes of at least a portion is relative with first and second stator lateral electrode, form respectively with interconnective the one the second electrostatic capacitances of series connection form.Interior all sides at a regulating part have one to be used for keeping moving plate in space wherein, at an edge side of this regulating part one skirt section are arranged, and its edge surface contacts with a primary flat of substrate.At the remaining edge place of this regulating part, there is an adjusting shaped member to engage with modulation anchor clamps or instrument.This regulating part can rotate around an axis that extends vertically up to a primary flat of substrate, and all insulate with stator lateral electrode and moving plate lateral electrode.For skirt section and substrate one primary flat that makes regulating part keeps in touch, provide a contact holding device.Part is transmitted in a rotation made from elastomeric material place between the moving plate of regulating part and inside, skirt section, so that the rotation of working as the permission regulating part to the moving plate transmission, when moving plate and regulating part are rotated together, is pressed moving plate towards a primary flat of substrate always.

According to preferred embodiment of the present invention, regulating part has the shaft portion of a definite axis.Substrate and moving plate have a bearing opening so that shaft portion passes.The contact holding device has a fastener to engage with spindle unit on another primary flat of substrate, deviates from from the bearing opening to prevent axle.The contact holding device is placed between another primary flat of substrate and the fastener.The contact holding device also has an elastic component to show the spring-loaded activation in the direction of leaving substrate along fastener.

According to another embodiment of the present invention, variable capacitor has a top board relative with a primary flat of substrate or " ceiling " part, and has an opening to be exposed with the adjusting shaped member that allows regulating part.The contact holding device has a spring-loaded compression member, is used for activating them along the direction that ceiling portion and regulating part are separated from each other.

According to one aspect of the present invention, rotating transmission device has O shape ring, and regulating part has the groove of a ring-type therein simultaneously, is used for determining the position of O shape ring.Be more preferably, this groove has the bottom that a unevenness is arranged.

According to another aspect of the present invention, on a primary flat of substrate, be formed with first and second termination electrodes.This first and second termination electrode links to each other with the first and second stator lateral electrodes through the first and second lead-in wire electrodes, and is placed in the outside that is used for the zone that contacts with the regulating part skirt section.Wideer with some part of the contacted first and second lead-in wire electrodes in the skirt section of regulating part than the remainder of lead-in wire electrode.

Principle of the present invention is suitable for inside equally a variable capacitor and the LC assembling device that inductance element is in series.This LC device has a dielectric substrates, and (substrate has a primary flat, be formed with the first and second stator lateral electrodes that separate on it), moving plate, several moving plate lateral electrode, regulating part that has the skirt section and regulate the shape part, contact holding device and and rotates the transmission part.Except these parts, the LC assembling device also has following element.

Except the first and second stator lateral electrodes, also have first to three-end electrode on substrate: first and second termination electrodes link to each other with the first and second stator lateral electrodes respectively by the first and second lead-in wire electrodes; Three-end electrode is independent of first and second termination electrodes.Inductance element be connected second and three-end electrode between.Radome is associated with substrate, and this is covered with an opening can be exposed the adjusting shape part of regulating part.This radome contacts with substrate, determines the inner space that can hold regulating part and inductance element within it.

The purpose of these and other, characteristic and advantage will show in the detailed description to preferred embodiment of the present invention below in conjunction with the accompanying drawings.

Fig. 1 is the front view of the LC assembly of first embodiment of the invention, and for ease of explanation, header board is removed.Wherein, the part of regulating part and radome shows with cutaway perspective form.

Fig. 2 is the plane graph of LC assembly among Fig. 1, in order more to see clearly Chu, has removed radome.

Fig. 3 is the exploded view (except coil wherein) of the critical piece of modular construction illustrated in figures 1 and 2.

Fig. 4 is the perspective view of regulating part of the LC assembly of second embodiment of the invention.

Fig. 5 is the radome of third embodiment of the invention and the partial plan of relative regulating part.

Fig. 6 is the plane graph of a moving plate, explains the fourth embodiment of the present invention.

Fig. 7 is the key diagram of the fifth embodiment of the present invention, and certain part corresponding to left-half in Fig. 1 structure is shown.

Fig. 8 is the key diagram of sixth embodiment of the invention, illustrate with Fig. 7 structure in corresponding certain part.

Fig. 9 is the key diagram of seventh embodiment of the invention, illustrate with Fig. 7 structure in corresponding certain part.

Figure 10 is the key diagram of eighth embodiment of the invention, illustrate with Fig. 7 structure in corresponding certain part.

Figure 11 illustrates the radome of ninth embodiment of the invention and the partial plan of associated regulating part.

Figure 12 is the fragmentary cross-sectional view of radome shown in Figure 11.

Figure 13 is the plane graph of a substrate, and the tenth embodiment of the present invention is described.

Figure 14 illustrates the plane graph that is installed in the on-chip moving plate among Figure 13.

Figure 15 describes prior art LC component internal structure, and substrate and radome partly illustrate with profile.

Figure 16 is the bottom view of prior art device shown in Figure 15.

Figure 17 illustrates the equivalent electric circuit of prior art device among Figure 15.

LC assembling device structure according to preferred embodiment of the present invention is shown in Fig. 1 to 3.This device is pointed out with label 21, hereinafter will be referred to as " LC assembly ".LC assembly 21 has one and similar circuit configuration shown in Figure 17.The LC assembly has a variable capacitor 22 (corresponding to 2 among Figure 17), a coil 23 (corresponding to 3 among Figure 17), also has one group first to the 3rd terminal 24-26 (corresponding to the 4-6 among Figure 17).Notice that LC assembly 21 is so to design, thus compatible fully with assembly shown in Figure 15 and 16.

LC assembly 21 has a substrate 27, by making through electrical insulating material or the dielectric material (as aluminium oxide) selected, dielectric substrate 27 has a primary flat has a pair of first and second stator lateral electrode sheets 28,29 that separate--as the end face in Fig. 1 or 3 situations--above it, general each electrode slice all is a semicircular sector, lump together and form a disk figure, be shown in Fig. 3.The upper surface of substrate also has the plane terminal plate 32 of a rectangle, is connected with the first semicircular electrode sheet 28 by lead-in wire electrode 30, and a circular terminal 33 links to each other with the second semicircular electrode sheet 29 by lead-in wire 31.At the select location place of upper surface one periphery of substrate 27, also have the 3rd terminal plate 34, may be independent of first and second terminal weld zones 32,33 (promptly insulate with their).The electrode slice 35 of one standby (or " free time ") is positioned at the upper surface of substrate, on the periphery over there, as shown in Figure 3.

These electrode slices 28-35 on the dielectric substrate 27 is made by present obtainable circuit pattern printing technology, comprises that using exposure technology (phofoexposure) forms the step of figure such as precipitating conductive film thereon.Best is after making the figure operation by lithography, the 28-35 that obtains to be made mirror finish handle with this kind drift (oetting-drift) and quality factor characteristic set.Sheet 28-35 is the multi-layer conductive that thickness has increased, and every have two layers or more multi-layered conductive paste layer, also can stand the desired surface polishing to guarantee that the first and second stator lateral electrode sheets 28,29 have along its thickness under distortion or the crooked situation at substrate 27.

Substrate 27 has a through hole in the center of circular figure, and this circular figure is determined by a pair of semicircle stator electrode slice 28,29.Through hole 36 act as a bearing opening.Except standby 35, substrate 37 also has through hole 37-39, and each through hole is all at the center of corresponding first to the 3rd terminal plate.

Know as Fig. 3 to illustrate that the moving plate plate 40 of a coin is installed on dielectric substrate 27 first circular electrode slices to above 28,29, thereby contacts with them.Moving plate plate 40 can be made by ceramic medium material.Moving plate plate 40 has a dead eye in its center, just in time the through hole 36 of alignment substrate 27.

Moving plate 40 is having a pair of semicircular sector electrode that separates 42,43 on the surface thereon under the situation shown in Figure 3, and both lump together and determine a ring-type figure.On substrate 27 because in the middle of ceramic moving plate plate 40 is sandwiched in, be stacked in to 42,43 insulation of moving plate lateral electrode stator lateral electrode sheet 28,29 above.It is important that semicircle rotor plate electrode 42 is relative with half of a half-sum 29 of stator electrode slice 28 simultaneously, and another rotor plate electrode 43 simultaneously with stator electrode slice 28 second half and 29 second half is relative.Like this, rotor plate electrode 42 forms first electric capacity and second electric capacity with the part of electrode slice 28,29 respectively, and these two electric capacity are connected mutually.Equally, another rotor plate electrode 43 also forms the 3rd electric capacity and the 4th electric capacity of mutual series connection respectively with the part of electrode slice 28,29.In addition, a similar variable capacitor that has electrode slice 28-29 and 42-43 does not in essence disclose for example disclosed the examination in the Japanese Utility Model 58-133926 application for registration.

Stator electrode slice 28,29 makes the tandem compound of first electric capacity and second electric capacity be connected with the tandem compound of the 4th electric capacity is parallel with one another with another the 3rd electric capacity; So these two electrodes 42,43 and moving plate plate 40 can increase the maximum of total electrostatic capacitance when using together.Yet this point is no specific requirement in practice of the present invention, also can have only on the moving plate plate 40 with electrode 42,43 in one.

Rotor plate electrode 42,43 can be the conductive film figure in the upper surface formation of moving plate plate 40; Or separately preparation is placed on metallic plate or metal forming on the moving plate plate.Moving plate 40 can also have rotor plate electrode and be clipped in wherein multilayer laminated structure; In this case, can make rotor plate electrode with below on-chip stator electrode slice 28,29 relative, the part of moving plate that makes multilayer makes at the electrostatic capacitance value that obtains to increase simultaneously in the middle of them, can keep the mechanical strength that strengthens.

Cylindricality or cylindrical regulating part 44 are contained on the dielectric substrate 27, can be on substrate 27 and the rectangular axis rotation of first type surface.Say in particular adjuster 44 the upright axle 45 of a regulation axis is arranged, it is rotatably inserted the dead eye 41 of moving plate 40 and the through hole 36 of substrate 27.

Adjuster 44 thereunder marginal portion has a skirt section 46, it within it portion determine that the space of a hollow can hold moving plate 40.The circumferential edges in skirt section 46 contacts with the upper surface of substrate 27, thereby enters or " intrusions " eliminating or suppress those undesirable polluters at least greatly, provides a benefit of adding aspect the inner space between moving plate 40 and substrate 27.Adjuster 44 also has a stepped part on the outer circumference surface of a select location, and the diameter of the cylindrical part above skirt section 46 receipts are little.

Also have, adjuster 44 has a surface texture in its top, is used for and adjustment means or the anchor clamps selected engage, and this surface texture can be elongated translot 48, can engage with the flat recess bit screwdriver.The shape of capacitor regulating tank 48 can freely change as required.

Be more preferably, adjuster 44 is used through the dielectric material integral body of selecting by molding technique and is made, material therefor can be the resin material of meeting thermal deformation, can be (but being not limited to) polyamide resin material, polybutylene terephthalate, liquid crystalline resin, polyphenylene sulfide, or ceramic based material.When using resin material, suggestion can utilize certain resin with high deformation temperature, has desired stability and durability when guaranteeing that material is in heating when the welding LC assembly 21, and guarantees long term reliability.

Notice that adjuster 44 needn't all be electric insulation at its Zone Full.Adjuster 44 can be in ground, the limit lower part insulation that must partly obtain dielectricity of relevant it with stator electrode slice and rotor plate electrode 42,43 at least.

The skirt section 46 of adjuster 44 can be used as and guarantees the contact holding device that continues to contact with the last primary flat of substrate 27.Among this embodiment, there is a fastener in skirt section 46, and it engages with axle 45 on the bottom major surface of substrate 27, is used for preventing that axle 45 from deviating to unclamp from dead eye 36,41.Here fastener is a push button nut 49, shown in Fig. 1 or 3.Push button nut 49 engages with axle 45 in the lower edge of axle 45; One after engaging like this, and nut 49 just " has been bitten " axle 45, forms fixing joint, eliminated unclamping or come off from axle 45 any contingency.

With a resilience or elastic component 50 conduct contact holding devices, elastic component 50 can be a spring washer as shown in Figure 3 again.Before axle 45 and push type nut engages, spring washer 50 is inserted axle 45, be placed between the lower surface and nut 49 of substrate 27.Packing ring 50 presents an elastic load so that nut 49 is applied mechanical force in the direction of leaving substrate 27 along nut 49.

Using spring washer 50 is favourable making skirt section 46 and substrate 27 aspect can linking together more reliably.When being reduced to actual time, if this favourable part very important not then can be used packing ring 50, and nut 49 is directly contacted with the lower surface of substrate 27.

When skirt section 46 contacts with substrate 27 in a manner described, first and second terminal electrodes 24,25 are placed the contact area place in addition in skirt section 46.Skirt section 46 also contacts with on-chip lead-in wire figure 30,31, as shown in Figure 2.Therefore, when rotary actuator 44 repeatedly, the repeated friction between skirt section 46 and the lead-in wire 30,31 can cause taking place undesirable disconnection that is electrically connected.For reducing the risk of electric disconnection, present embodiment specially makes the width of on-chip lead-in wire 30,31 change: the 30a of lead-in wire 30,31, the width of 31a part is wideer than the width of remainder.Adopt the variable-width scheme of this lead-in wire 30,31, can on substrate 27, reduce the possibility of electric disconnection in the level and smooth rotation at adjuster 44.

As shown in Figure 1, rotating transmission part 51 to one places between the adjuster 44 and moving plate 40 of 46 inner spaces, skirt section.It can be elastic component that part 51 is transmitted in this rotation, and rotatablely moving of regulating part 44 transmitted when it is rotated together to moving plate 40, moving plate 40 is continued to push or is against on dielectric substrate 27 upper surfaces.In the present embodiment, transmitting part 51 is made of O shape ring.Adjuster 44 has an endless groove to be used to regulate the position of O shape ring.

Between O shape ring 51 and the regulating part 44 and the friction that produces between O shape ring 51 and the moving plate 40 cause that moving plate 40 and regulating part 44 rotate so together, the elastic force that adds by the circulating application of O shape moving plate 40 by being pressed on the substrate 27.Be more preferably, dispose O shape ring like this, thereby the size of any deformation that may cause because of contact of O shape ring is less than its elastic limit.

As shown in Figure 1, aforesaid the first terminal 24 has a pedestal 53, and the sheet 32 that is welded on the substrate 27 provides electrical interconnection, simultaneously bar 24 is inserted the through hole 37 that passes substrate 27 from the below.Among the figure, welding portion is not shown for simplicity's sake.

As shown in Figures 2 and 3, coil 23 constitutes an inductance element on substrate, and in the present embodiment, it is an air core inductor device.The people who is familiar with this area is appreciated that air core coil 23 can be by replacements such as a sheet inductor or printed wiring figure inductors if suitable.

As shown in Figure 1, coil 23 is installed in the upper surface of dielectric substrate 27 by such mode." pin " that extend its inserts through hole 38 so that its termination end is passed substrate 27 stretches out from the lower surface of substrate.The pin of coil and 33 welding of the sheet among Fig. 2 are so that there is electrical interconnection between them.The pin of the coil that this stretches out has downwards formed second terminal 25 that the front is said.Pin shown in coil 23 another extensions inserts downwards in the through hole 39 at square plate 34 centers on the substrate 27, thereby its this end extends downwardly into below the lower surface of substrate as shown in Figure 1.This coil pin and sheet 34 welding are electrically connected to reach, and it is as the 3rd terminal as previously mentioned.This welding portion does not illustrate in the drawings.The second and the 3rd terminal 25,26 also can be made of the conductor of separately preparing in case of necessity, and they are electrically connected with two pin of coil respectively.

As seen from Figure 1, formed substrate assembly surrounds with radome 54, and the periphery of cover and substrate 27 joins to hold adjuster 44 and coil 23 inside.Radome 54 has an opening 55 on its top board or " ceiling ", the preparation vessel 48 of adjuster 44 is exposed.It is highly important that, cover 54 without any window come corresponding to the window in the prior art constructions shown in Figure 15 20.

The inside of 54 pairs of LC assemblies 21 of radome shields, and makes its environmental sealing simultaneously, to repel pollutant.Cover 54 can use electric conducting material, for example makes through the metal material of selection.Cover 54 is made up of a top board and four sidewalls in essence, one group of a plurality of curved pitch cutting 56 (bentcut pieces) and a plurality of protrusion as retainer are arranged on the sidewall, the periphery of substrate 27 is clamped with respect to the sidewall of cover 54 regularly by them, played the effect of position alignment.

The sidewall of radome 54 down extends from the lower surface of substrate 27, and substrate has determined to hold the inner space of adjuster 44 and axle 45.Cover 54 also has the part of stretching from the downward integral body of lower limb 58, so that ground connection to be provided.

Except that above-mentioned simple metal material, radome 54 can be used resin material such as liquid crystalline resin or the similar material of easily electroplating, the metal material of nickel plating, and electroconductive resin, and other equivalent materials are made.

So the LC assembly of arranging 21 provides the circuit structure that is shown in Figure 17, wherein, form electrostatic capacitance by the variable capacitor between first and second terminals 24,25 among Fig. 1 22, the inductance of being determined by coil 23 then is removed between the second and the 3rd terminal 25,26.It is variable that electrostatic capacitance relies on the rotation of adjuster 44: as shown in Figure 3, when adjuster 44 be in rotor plate electrode to 42,43 middle finedraw and stator electrode slice to 28, when 29 middle finedraw is vertical, the value maximum of electrostatic capacitance, electrostatic capacitance value minimum when the former is parallel with the latter.

The adjuster 44 of the second embodiment of the present invention is shown in Fig. 4, and it has described the lower perspective view of adjuster.In this embodiment, a unevenness is arranged at the bottom of adjuster 44 endless grooves 52, is used for the position alignment of O shape ring 51.Adopt this structure, prevented the excessive slippage between O shape ring 51 and the adjuster 44, the rotating torques of adjuster 44 is passed more reliably to moving plate 40.

Fig. 5 represents the LC assembly of the third embodiment of the present invention, and only it shows the major part and the radome 54 of adjuster 44 for illustrative purposes.In the present embodiment, adjuster 44 has a retainer 59 that laterally protrudes.Like this design retainer 59, no matter the direction of rotation of transferring device 44 how, total retainer contacts with radome 54 inner surfaces, and is pointed as double dot dash line, forces the anglec of rotation scope of regulating part 44 to be limited in less than in 360 scopes of spending.The manual operation that this convenient user's of meeting capacitance is regulated.As needs, can revise radome 54, hold retainer 59 to add special shape on its corresponding surface.

Fig. 6 illustrates the moving plate 40 of the 4th embodiment.In this embodiment, the edge of moving plate 40 has one to cut part 60.The ledge (not shown) that cuts part such as the adjuster 44 of a part 60 and a special shape engages, to improve the reliability of the position alignment between moving plate 40 and the adjuster 44.

Fig. 7 represents among the 5th embodiment that corresponding to the critical piece of LC assembly left-half shown in Figure 1, and the first terminal 24 be cannot see.The embodiment of Fig. 7 has just increased a helical spring 62 similar in appearance to the embodiment of Fig. 1-3, as the load on spring pressing piece adjuster 44 is mechanically exerted pressure to increase its immobility to the upper surface of substrate 27.Specifically, as shown in Figure 7, helical spring 62 and is placed between the ceiling 61 of the end face of base flange 47 of substrate adjusted device 44 and the radome above it 54 on adjuster 44, to apply elastic force enduringly adjuster 44 is pushed away towards substrate 27 along the direction of leaving ceiling 61.Thereby outside the contact maintenance effect of push button nut 49 and spring washer 50, strengthen the contact maintenance effect between adjuster 44 and the substrate 27 again.

The 8th embodiment shown in Figure 8 is similar with Fig. 7, and it has deleted push button nut 49 and spring washer 50, and the contact holding device only is made up of helical spring 62.Do not had to make behind nut 49 and the packing ring 50 axle 45 of adjuster 44 to shorten, the distal lower end that makes it flushes with the lower surface of substrate 27 as shown in the figure substantially.For radome 54 also is so, and cover 54 needn't extend beyond the bottom surface of substrate 27 downwards.Take this structure, can further reduce size.

The 7th embodiment shown in Figure 9 is similar with Fig. 7, it has deleted the axle 45 of adjuster 44, and has one and the recess 63 that engages of adjuster 44 lower surfaces at substrate 27 upper surfaces, and adjuster 44 is rotatably clamped, its external margin is by the inwall of recess 63 chucking, as shown in Figure 9.Can remove the dead eye 36,41 on substrate 27 and the moving plate 40 like this.

The 8th embodiment shown in Figure 10 is similar with Fig. 7, and it has deleted the regulating shaft 45 of adjuster 44, and has added a shaft portion 64 at the upper surface of substrate 27, and adjuster 44 has a recess 65 to hold axle 64.Axle 64 is inserted the dead eye 41 of moving plate 40.Correspondingly, axle 64 is inserted recess 65, allow it and recess engage, adjuster 44 is supported on the substrate 27 with being rotated.

It should be noted that in the embodiment shown in Fig. 7-10, can make a global facility to helical spring 62 and adjuster 44, like this, be convenient to processed by the form structure of spring 62 being inserted assembling adjuster 44.

The 9th embodiment is shown in Figure 11 and Figure 12, and Figure 11 shows the partly shielding effect cover, and Figure 12 has described its cut-away section front view.This embodiment is similar with Fig. 7's-10, and just helical spring 62 changes one flat plate spring leaf 66 into, and it constitutes with the part of cover 54.

Say in particular, as shown in figure 11, radome 54 is excised partly, with the figure of a plurality of (being four herein) fan-shaped part 66 of exposing opening 55 that contour regulating part one groove is provided, thereby causes the termination of each fan-shaped part local deformation to form planar spring sheet among Figure 12 to pressing down.Regulating part 44 is less at the diameter of its capacitance adjustment slot part, forms the stepped part 67 that chain-dotted line is pointed out among Figure 12.The position of stepped part is higher than foregoing base flange 47.After assembling, the planar spring sheet of " integral body " 66 with below stepped part 67 Elastic Contact in cover of regulating part 44.Spring 66 is identical with helical spring 62 among Fig. 7 on function, all is the load on spring pressing piece, and regulating part 44 is mechanically worked, and it is pressed on the upper surface 61 of substrate 27 along the direction that regulating part 44 leaves cowl top panel 61 constantly.

The tenth embodiment is shown in Figure 13 and 14, and wherein, Figure 13 is the plane graph of the dielectric substrate 27 of usefulness here, and Figure 14 is the plane graph of moving plate 40.First embodiment of present embodiment and Fig. 1-3 is similar, and just the flat shape of stator brace 68-69 and rotor plate electrode 70 has been done modification, and is as described below.

As Figure 13, a pair of semicircle stator brace 68,69 on the substrate 27 is designed to present concentric interior and outer semicircular sector figure, mutually insulated.As seen from Figure 14, rotor plate electrode 70 resembles a semicircular sector figure.The above-mentioned this electrode that is similar to the formation figure of stator brace 68-69 and rotor plate electrode 70 for example discloses in the unexamined Japanese Utility Model 58-133926 application for registration of having announced.

In the present embodiment of Figure 13-14, rotor plate electrode 70 is relative with following on-chip stator brace 68-69, in the middle of moving plate 40 is sandwiched in, thereby at rotor plate electrode 70 and a slice, thin piece 68, and form electrostatic capacitance respectively between rotor plate electrode 70 and the another one slice, thin piece 69, and be connected in series by electrode 70.When rotor plate electrode 70 and slice, thin piece 68-69 complete when overlapping total capacitance increase to maximum, otherwise the value of electric capacity can reduce.

The flat shape of stator slice, thin piece 68-69 and rotor plate electrode 70 can be by changing over arbitrary obtuse angle with its central angle, and be modified as any fan shape except that the semicircle that illustrates, so that adjusting angle changes on demand.Equally, slice, thin piece 68-69 also can revise by the area ratio between them.

Among Figure 13-14, identical part has identical label.As shown in figure 13, outer plate 69 is local outwards expansion at its two ends, forms extended area 71,72.There is extra or " standby " sheet 73 on the opposite of slice, thin piece 68-69 on the substrate 27.Come to have on the compensates for substrate half zone of slice, thin piece 68-69 and do not have any difference in height in second half zone of slice, thin piece 68-69 with these sheet subdivisions 71-73, thus in the electric contact area in the skirt section 46 that increases regulating part 44, increase the flatness that moving plate 40 and regulating part 44 (can't see) rotatablely move in Figure 13-14, thereby advantageously reduced the risk of the lead-in wire electric disconnection in 30-31 place on undesirable substrate 27.

The area that to implement significant advantage of LC assembly with special variable capacitance of the present invention be moving plate lateral electrode and stator lateral electrode sheet need not exceedingly to strengthen, thereby make the LC assembly can resist the adverse effect of the spuious or parasitic capacitance of environment, when reducing complexity and manufacturing cost, increase reliability thus.Why can so say so because arbitrary required electrostatic capacitance value can obtain by the relative dielectric constant that increases the capacitor insulation body, use special moving plate to constitute the air that uses in dielectric material rather than the prior art here.

Another advantage of the present invention is to have the ability to reduce the variable capacitor size, and no longer require on radome, to be provided with extra window, the interference of moving plate lateral electrode or moving plate itself when assembling the LC assembly to eliminate obtains maximum performance thereby make by using isolated pollutant of radome and shielding action.

Also having an advantage is that arbitrary required capacitance can obtain under the situation that usefulness improves.Why so say so because moving plate and electrode thereof are contained within the regulating part skirt section regularly, the risk that contacts the electric capacity forfeiture that causes owing to moving plate lateral electrode and radome inwall are accidental can not take place.

Another advantage is the reliability that can further improve variable capacitor and use the LC assembly of variable capacitor.This is based on and does not need at movable part the electrical interconnection path to be set to take out electrostatic capacitance from device architecture.Why so say so because the tandem compound of the one the second electrostatic capacitances obtains by the moving plate lateral electrode, wherein, rotor plate electrode is relative with a pair of stator lateral electrode sheet that separates on the substrate, has determined first and second electric capacity.

An advantage is arranged again is this improved variable capacitor and use it and the LC assembly can be made with manufacturing techniques available, has therefore reduced complexity and cost.

There is an advantage to be again because regulating part is insulation thereby instrument that need not use insulation, by using the accuracy that the adjuster rotation technique can improve capacitance adjustment.

An advantage more of the present invention is because hardly because of the tight contact that is installed in on-chip moving plate changes and deviation, the accuracy of user's manual capacitance adjustment can be improved greatly.Reason is as follows, transmits part with the elastic torque between moving plate and the substrate moving plate is pushed substrate top surface all the time.Correspondingly, even moving plate be by the dielectric material of hard and easy fracture for example pottery make, can successfully prevent occasional breakage when on substrate, this pottery moving plate being installed, even adjuster has tilted when the user carries out manual capacitance adjustment also can guarantee that tight the contact hardly of moving plate and substrate can change simultaneously.

Also having an advantage is that adjuster has an axle as pivot, axle passes the dead eye of substrate and moving plate respectively, be used for keeping the contacted holding device that contacts of skirt section and substrate one first type surface to make by simplified structure, this simplified structure comprises and axle joint fastener to prevent that axle and the dead eye that is connected from deviating from another primary flat of substrate.In the case, when the contact holding device adds the elastic supporting member for supporting optical member of a load on spring again so that fastener can pushed substrate all the time along the direction that it leaves substrate between another surface of substrate and fastener, even wear and tear in axle place's occurrence positions misalignment of fastener and/or at the fastener place or in its dependent part office like this, also can keep the contact condition of desired skirt section and substrate reliably.Simultaneously, when allowing to exist, still can reach the accuracy of assembling than high tolerance.

It is to comprise top board or " ceiling " that a primary flat with substrate is relative again when variable capacitance that the present invention also has an advantage, and opening is arranged onboard to expose the adjusting shape part of regulating part, the contact holding device can be with the pressing piece of elastic load formation, with along ceiling and regulating part away from direction apply mechanism for regulating part.Like this, with regard to the assembling accuracy, allow to exist simultaneously, keeping reliably that desired the contact is possible between skirt section and substrate than high tolerance.

It is to include an O shape ring to the torque transmitter that moving plate transmits the rotation of adjuster that one advantage is arranged again, and such structure can reduce manufacturing cost, because device manufacturer can be used available parts with low cost.And, when formation one endless groove is aimed at O shape ring position, not only can increase the reliability of the position alignment of O shape ring, also can allow an O shape ring to be pre-assembled in the regulating part and go, this has just improved variable capacitance and/or has used the efficient of assembling process of the LC assembly of variable capacitance.

In addition, according to the foregoing description, because of there is a unevenness bottom surface at regulating tank, so undesirable slip all can be eliminated between any O shape ring and the regulating part.This can increase reliability and efficient that regulating part transmits to the rotation of moving plate.

Another advantage of the present invention is to form first and second terminal plates on a primary flat of substrate, these sheets are placed on beyond a certain zone, in order to contact with the skirt section with regulating part, and be connected with the first and second stator electrode slices on substrate surface by first and second lead-in wires, when the lead portion that contacts with the regulating part skirt section when being used for of selecting is wideer than remainder, it is possible making rotatablely moving of regulating part become smooth, at this moment skirt section and substrate surface keep in touch, suppressed owing to slide repeatedly and cause the generation of any undesirable electric disconnection in the skirt section, thereby prolonged variable capacitor and used useful life of the LC assembly of variable capacitor.

Though represent especially and described the present invention in conjunction with preferred embodiment, the people who is familiar with prior art can do the change of above-mentioned other as can be known to form and details under the prerequisite that does not deviate from main spirit and scope of the present invention.

Claims (8)

1. A variable capacitor, characterized in that it comprises: An electrically insulating substrate having separate first and second stator side electrodes on its principal plane; a rotor made of a dielectric material disposed in contact with said first and second stator side electrodes; a rotor-side electrode supported by the rotor, opposite to the first and second stator-side electrodes, at least a part of the rotor being located between the first and second stator-side electrodes so as to be in contact with the first and second stator-side electrodes; forming first and second electrostatic capacitances, respectively, and connecting the first and second electrostatic capacitances to each other in series; an adjustment member forming a space inside it to accommodate said rotor, having a skirt at one end whose edge surface is in contact with a main plane of the substrate, and an adjustment shape portion at the remaining edge surface of said adjustment member engaged with an adjustment tool, the adjustment member is rotatable about an axis perpendicular to a principal plane of the substrate, and is electrically insulated from the first and second stator-side electrodes and the rotor-side electrodes; contact maintaining means for maintaining said skirt of said adjustment member in contact with a major plane of said substrate; and a rotation transmission member made of elastic material, which is placed between the adjustment member and the rotor inside the skirt, the rotor pressing against the base when the rotation is transmitted from the adjustment member to the rotor One main plane of the blade, so that the moving blade and the adjusting piece rotate together. 2. The variable capacitor according to claim 1, wherein the adjustment member includes a shaft portion defining an axis, the substrate and the moving plate have bearing holes through which the shaft portion passes, and The contact holding device has an engaging piece engaged with the shaft portion on the other main plane of the substrate to prevent the shaft portion from being disengaged from the bearing hole. 3. The variable capacitor according to claim 2, wherein said contact holding means is arranged between the opposite main plane of the substrate and said adjusting member, and further comprises an elastic member along said adjusting member. The direction in which the bonding element leaves the substrate exhibits an elastic loading effect. 4. The variable capacitor of claim 1, further comprising: a flat plate portion, opposite to the other main plane of the substrate, and having an opening to allow the adjustment shape portion of the adjustment member to be exposed, the contact holding means comprising an elastically loaded compression member along the The direction in which the plate portion and the adjuster portion are separated acts upon them. 5. The variable capacitor according to any one of claims 1-4, characterized in that any O-ring of said rotation transmitting device has an annular groove in said adjusting member for determining said O-ring. The position of the ring. 6. The variable capacitor according to claim 5, wherein the groove has a bottom surface, and the bottom surface has an unevenness. 7. The variable capacitor according to any one of claims 1-6, wherein first and second terminal electrodes are formed on a main plane of the substrate, and the first and second terminal electrodes The first and second lead wires are connected to the first and second stator side electrodes, and are placed outside an area in contact with the skirt of the regulator, and the first and second lead wires are connected to the regulator The width of the part where the part skirt contacts is wider than the width of the remaining part. 8. An LC component, characterized in that it comprises: An electrically insulating substrate has separate first and second stator side electrodes on one of its main planes, and the substrate has electrodes connected to the first and second stator side electrodes respectively through first and second lead wires. first and second terminal electrodes, and possibly a third terminal electrode independent of said first and second terminal electrodes; a movable piece of dielectric material arranged in contact with said first and second stator side electrodes; a rotor-side electrode supported by said rotor so as to oppose said first and second stator-side electrodes, said rotor being at least partially sandwiched between said first and second stator-side electrodes forming first and second electrostatic capacitors respectively, and connecting the first and second electrostatic capacitors in series; An adjusting member with a space inside to accommodate the moving piece, a skirt at one end section connected to a main plane of the substrate at its edge surface, and an adjusting shape portion of the adjusting member at the other end engaged with an adjusting jig, the The adjusting member is rotatable around an axis perpendicular to a main plane of the substrate, and is electrically insulated from the first and second stator side electrodes and the moving piece side electrode; contact holding means for maintaining contact between the adjustment member skirt and a main plane of the substrate; A rotation transmission member made of elastic material is provided between the adjustment member and the rotor in the skirt to press the rotor against the rotor when the torque of the adjustment member is transmitted to the rotor. on a main plane of the substrate, so that the moving piece and the adjusting member rotate together; and A shielding case has an opening to expose the modulated shape part of the adjustment part, is connected to the substrate, and contains the adjustment part and the inductor therein.

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