CN1094242C - Variable capacitor - Google Patents

Abstract

A variable capacitor in which a cover which rotatably holds a rotor against a stator is provided and a hole for adjustment into which a tool for rotatably operating the rotor can be inserted and, at the same time, a spring action section which comes into contact with the rotor and press-contacts the rotor with the stator is provided around the hole for adjustment, three or more projections 36 are provided in the spring action section 35, so that the projections 36 may be arranged along the direction of rotation of the rotor 23 and may substantially come into point-contact with the rotor 23. Therefore, the machining dispersion of the rotor 23 and the cover 24 can be absorbed and the contacting state of the rotor 23 with the stator 22 is stabilized, and then, the rotating torque of the rotor 23 can be made relatively stronger.

Description

Variable capacitor

The present invention relates to variable capacitor, relate in particular to the effective opposed area change that makes stator electrode and rotor electrode by the rotation of stator electrode and rotor electrode, thereby make the variable capacitor of electrostatic capacitance change.

The variable capacitor relevant with the present invention is recorded in the spy respectively and opens flat 6-120079 communique and the flat 6-290994 communique of Te Kai.Fig. 8 illustrates the spy and drives the variable capacitor that flat 6-120079 communique is put down in writing, and Fig. 9 illustrates the variable capacitor that the spy opens flat 6-290994 communique record.

Variable capacitor 1 shown in Figure 8 comprises and inner form stator 3 stator electrode 2, that be made of ceramic dielectric and form rotor 5 rotor electrode 4, that be made of metal below.Rotor electrode 4 is for stator electrode 2, is that the part of the ceramic dielectric by constituting stator 3 is opposed.

In addition, for making the variation of stator electrode 4 and effective opposed area of stator electrode 2, rotor 5 is by keeping the stator 3 rotating shells 6 that are made of metal.Shell 6 has and holds the shape that rotor 5 is rotated, and is fixed on the stator 3.

On shell 6, form the adjustment hole that to insert rotating operation rotor 5 usefulness devices.And, around the adjustment hole 7 of shell 6, be provided with the spring action portion 8 of rotor 5 to stator 3 crimping.Spring action portion 8 is more and is the more shape of below inclination to the center around adjustment hole 7, therefore can adjust hole 7 metal material on every side itself by this and obtain.

In such variable capacitor 1, in order to take out the electrostatic capacitance that forms with the opposed of rotor electrode 4 by stator electrode 2, on the end surface layer of stator 3, have the conducting film that is electrically connected with stator electrode 2, form stator terminal 9, on the other hand, on the shell 6 that the rotor 5 with formation rotor electrode 4 contacts, be provided with rotor terminal 10.Therefore, above-mentioned electrostatic capacitance can be taken out between stator terminal 9 and rotor terminal 10, and changes the effective opposed area of stator electrode 2 and rotor electrode 4 by rotary rotor 5, changes electrostatic capacitance accordingly.

On the other hand, the variable capacitor shown in Fig. 9 11 has the corresponding key element of key element that is had with variable capacitor shown in Figure 81.That is to say that variable capacitor 11 comprises and inner form stator 12 stator electrode (not shown), that be made of ceramic dielectric and form rotor 13 rotor electrode (not shown), that be made of metal below.Rotor 13 is by stator 12 shells 14 that are made of metal rotatable and that be fixed on the stator 12 are kept.

Also have, on shell 14, form the adjustment hole 15 of the device that can insert rotating operation rotor 13.And around the adjustment hole 15 of shell 14, be provided with the spring action portion 16 of rotor 13 to stator 12 crimping.

In such variable capacitor 11, in order to take out the electrostatic capacitance that forms by the opposed of stator electrode and rotor electrode, on the end surface of stator 12, have the conducting film that is electrically connected with stator electrode, form stator terminal 17, on the other hand, on the shell 14 that the rotor 13 with the formation rotor electrode contacts, be provided with rotor terminal 18.Therefore, can between stator terminal 17 and rotor terminal 18, take out above-mentioned electrostatic capacitance, and change the effective opposed area of stator electrode and rotor electrode, and correspondingly change electrostatic capacitance by rotor 13 is rotated.

Also have, on the stator 12 that the variable capacitor shown in Fig. 9 11 is had, with opposite end, described stator terminal 17 formed ends, also have conducting film, and form second stator terminal 19.Though do not illustrate, have shape and the configuration symmetrical with stator electrode in the inside of stator 12, form second stator electrode, this stator electrode of second is electrically connected with second stator terminal 19.Like this, stator terminal 19 by second and second stator electrode further form, and make stator 12 have symmetrical structure, in the combination of variable capacitor 11, do not need to consider the direction of stator 12.

Also have, on the shell 14 that the variable capacitor shown in Fig. 9 11 is had, be provided with a plurality of otch 20 of the marginal portion in self-adjusting hole 15 along the extension of radiation direction.These otch 20 have been stablized the spring action of spring action portion 16.

Yet above-described variable capacitor 1 and 11 has the following problem that should solve.

No matter at variable capacitor 1 still in variable capacitor 11, rotor 5 or 13 will carry out crimping comprehensively and equably to stator 3 or 12.This be because: if rotor 5 or 13 with stator 3 or 12 contact the pressure inhomogeneous, then can produce the electrostatic capacitance error, the variation that can not successfully produce the electrostatic capacitance of output owing to the rotation of rotor 5 or 13 is (typical, be linearity), locating bias becomes instability, rotor 5 or the 13 torque inequalities of rotating.

But, in variable capacitor 1 illustrated in fig. 8, contact portion in spring action portion 8 with rotor 5, the leading section that is spring action portion 8 is on the same circumference along the marginal portion of adjusting hole 7, therefore, when the depth of parallelism on the two sides of rotor 5 degenerated and the plane of rotor 5 degenerates or the flatness of the leading section of spring action portion 8 degenerates, spring action portion 8 crimping rotor 5 comprehensively and had equably just become difficulty, promptly runs into aforesaid problem.Also have, the two sides depth of parallelism of such rotor 5, or the unsuitable state of the flatness of the leading section of rotor 5 or spring action portion 8 also are more incidental in the processing technology of rotor 5 that is carried out for acquisition variable capacitor 1 and shell 6.

Also have, in variable capacitor 1, rotor 5 becomes the face or the line state of contact of extending continuously along rotor 5 rotation directions with contacting of spring action portion 8, therefore, the surperficial frictional resistance that rotor 5 is rotated diminishes, torque that rotor 5 rotates takes place and becomes also littler than required, the locating bias shakiness in its result.

On the other hand, the variable capacitor 11 shown in Fig. 9, its spring action portion 16 is separated into a plurality of parts by otch 20, and therefore, the each several part that is separated and other parts can be separate, and impose spring action.Therefore alleviated the problem that is produced in the above-mentioned variable capacitor 1 to a certain extent.

Yet, even in variable capacitor 11, each leading section of spring action portion 16 and contacting of rotor 13 of being separated by otch 20, become the face that extends along the rotation direction of rotor 13 or the contact condition of line, each leading section of the portion of spring action simultaneously 16 is in along the marginal portion of adjusting hole 15 on the same circumference and no change, therefore, also run into the problem identical, only the degree difference of difference with variable capacitor 1.

Therefore, the objective of the invention is to, a kind of variable capacitor that solves above-mentioned variety of issue is provided.

A kind of variable capacitor of the present invention, comprise: the stator that has formed electrode, with this stator electrode has been formed the rotor of opposed rotor electrode by medium, and for making rotor electrode to the variation of effective opposed area of stator electrode and keep rotor to the rotating shell of stator; On shell, form the adjustment hole of the instrument that can insert the rotating operation rotor, contact with rotor in the setting on every side of adjusting the hole simultaneously, and with the spring action portion of rotor to the stator crimping; It is characterized in that carrying out a plurality of projections that substantial point contacts with rotor, so this spring action portion contacts in many places rotor in the setting of spring action portion.

In the present invention, in spring action portion the projection more than three that distributes along the rotor rotation direction being set, is desirable.

Also having, in the present invention, at the otch that the shell setting is extended along the radiation direction from the marginal portion of adjusting the hole, is desirable.And, in such cases, the otch more than three that distributes along the rotor rotation direction being set on the shell, projection is arranged between the adjacent otch, is better.

Also have, in the present invention, form a plurality of stator electrodes on stator, each stator electrode is electrically connected with stator terminal, and stator, stator electrode and stator terminal have the shape of symmetry in fact.

Also have, in the present invention, spring action portion is the shape that more tilts to the center downwards around the adjustment hole.

Also have, in the present invention, spring action portion is separated into a plurality of separating parts by otch, and is separate and act between each separating part.

Also have, in the present invention, extension is provided with a plurality of locking pieces with holes on shell.

Also have, in the present invention, projection is desirable uniformly-spaced to dispose.

Below accompanying drawing is done simple declaration.

Fig. 1 is the stereoscopic figure of the variable capacitor 21 of the expression embodiment of the invention 1.

The stereoscopic figure of variable capacitor shown in Figure 1 21 below serving as reasons, Fig. 2 is shown.

Fig. 3 is the profile of the variable capacitor shown in Fig. 1 21.

The stereogram that Fig. 4 represents through decomposition for the key element that the variable capacitor shown in Fig. 1 21 is had.

The stereogram of rotor shown in Figure 4 23 below serving as reasons, Fig. 5 is shown.

The stereogram of stator shown in Figure 4 22 below serving as reasons, Fig. 6 is shown.

Fig. 7 is the variable capacitor of the explanation embodiment of the invention 2, is the stereogram of expression shell 40.

Fig. 8 wherein, (a) is vertical view for the variable capacitor 1 of expression first prior art relevant with the present invention; (b) be the profile of the B-B line of edge figure (a).

Fig. 9 is the stereoscopic figure of the variable capacitor 11 of expression second prior art relevant with the present invention.

Below some the main reference numeral in the accompanying drawing of the present invention are explained.

Wherein, 21-variable capacitor; 22-stator; 23-rotor; 40-shell; 25-stator electrode; 31-rotor electrode; 33-driver bay, 34,41-adjustment hole; 35,42-spring action portion; 36,43-projection; 37,38,45,46-locking piece; 44-otch.

Below in conjunction with accompanying drawing, the embodiment of the invention is described.

Fig. 1 to Fig. 6 is the figure of the explanation embodiment of the invention 1 variable capacitor 21, and wherein, Fig. 1 is the stereoscopic figure of expression variable capacitor 21; The stereoscopic figure of variable capacitor shown in Figure 1 21 below serving as reasons, Fig. 2 is shown; Fig. 3 is the profile of the variable capacitor shown in Fig. 1 21; Fig. 4 is the stereogram that key element is represented through decomposition that variable capacitor 21 has; Fig. 5 and Fig. 6 are for illustrating the stereogram of each key element shown in Figure 4 respectively from different perspectives.

Variable capacitor 21 mainly comprises stator 22, rotor 23 and shell 24.The major part of stator 22 is made of ceramic dielectric.Rotor 23 is made of the brass metal.Shell 24 is made of stainless steel or copper alloy, and is good for making weldability, at least also can carry out surface treatment with scolding tin, tin, silver etc. in required part.

The detailed structure of above-mentioned various critical pieces below is described respectively.

Rotor 22 illustrates with independent state in Fig. 4 and Fig. 6.Referring to figs. 1 through Fig. 4 and Fig. 6, can find out that stator 22 integral body have symmetrical structure.In the inside of stator 22, stator electrode 25 and 26 is to form side by side.Be electrically connected respectively with these two stator electrodes 25 and 26, on each end surface layer of stator 22, have conducting film, form stator terminal 27 and 28.

Like this, two stator electrodes 25 and 26 and two stator terminal 27 and 28 formation, the structure that is about to stator 22 makes symmetry, with this stator 22 combination variable capacitors 21 time, just need not consider the direction of stator 22.Therefore,, then also can omit the either party in stator electrode 25 and 26 if when not wanting to utilize this advantage, and the either party in the relevant therewith stator terminal 27 and 28.

Below stator 22, extend respectively to the inside from its opposed edges at two ends and form recess 29 and 30.

Rotor 23 illustrates with independent state in Fig. 4 and Fig. 5.With reference to Fig. 1 and Fig. 3 to Fig. 5, can find out rotor 23 be configured in described stator 22 above, have the section portion of protrusion in its lower section, form and be semicircle approximately rotor electrode 31.And, below rotor 23, form the protuberance 32 that has with rotor electrode 31 height double altitudes, because the existence of rotor electrode 31 can prevent that rotor 23 from tilting.

On rotor 23, form the driver bay of taking in to the devices such as driver of rotating operation rotor 33.In the present embodiment, driver bay 33 obtains by the foursquare through hole of section.

Shell 24 illustrates separately in Fig. 4.Referring to figs. 1 through Fig. 4, can find out that shell 24 takes in rotor 23, and be fixed on the stator 22.By this shell 24, keep 23 pairs of stators of rotor 22 rotatable.Formation can make the adjustment hole 34 that the driver bay of rotor 23 exposes on shell 24, can insert the devices such as driver of rotating operation rotor 23 by adjusting hole 34.

Around adjustment hole 34, setting contacts with rotor 23, with the spring action portion 35 of rotor 23 to stator 22 crimping.Spring action portion 35 adjust hole 34 around, be more to the center downward-sloping shape that heals, therefore, can obtain by this metal material that adjust around the hole 34 itself.

In spring action portion 35, be provided with rotor 23 and carry out the projection 36 that substantive point contacts.Like this, separate part contacts 35 pairs of rotors 23 of this spring action portion in many places.In the present embodiment, according to distributing like that, to be spacedly distributed like that, three projections 36 are set according to even more ideally along rotor 23 rotation directions.These projections 36 are such as forming by the metallic plate that constitutes shell 24 being carried out mold pressing processing.

Also have, on shell 24, the locking piece 37 and 38 of downward extension is set opposed to each other mutually.To form recess 29 and 30 sealed with stator 22 following respectively for locking piece 37 and 38, can make crookedly, in order easily to carry out this bending, the hole can be set respectively on locking piece 37 and 38.

Also have, on shell 24, extend downwards from the position different rotor terminal 39 is set with locking piece 37 and 38 set positions.

Use aforesaid stator 22, rotor 23 and shell 24, according to following manner combination variable capacitor 21.

Configuration rotor 23 on stator 22, configuration shell 24 covers rotor 23.Then,, shell 24 is pressed to stator 22, make the end direction bending to the inside respectively of locking piece set on the shell 24 37 and 38 simultaneously rotor 23 and stator 22 crimping.Like this, locking piece 37 and 38 becomes sealed state with stator 22 following formed recesses 29 and 30 respectively.

At this moment, be located on the shell 24 rotor terminal 39 just with stator 22 on the stator terminal 28 (in the illustrated embodiment, not having the function of making stator terminal) that is provided be in opposed locations.Therefore, between these rotor terminals 39 and stator terminal 28, apply the scolding tin (not shown), make the stationary state of 24 pairs of stators 22 of shell more firm, simultaneously also can be with stator terminal 28 as rotor terminal performance function.

Like this, just make up the variable capacitor 21 that is over.

In this assembled state, as shown in Figure 3,31 pairs of stator electrodes 25 of rotor electrode, the opposed electrostatic capacitance that forms of a part of the ceramic dielectric by constituting stator 22.For making this electrostatic capacitance change, make the effective opposed area change of 31 pairs of stator electrodes 25 of rotor electrode, rotating operation rotor 23.This electrostatic capacitance, can the stator terminal 27 that is electrically connected with stator electrode 25, with shell 24 that the rotor 23 that forms rotor electrode 31 contacts on taking-up between the set rotor terminal 39.

Also have, in the assembled state of variable capacitor 21, owing to be provided with projection 36 in the spring action portion 35 of shell 24, spring action portion 35 can impose on stable spring action rotor 23, so, between rotor 23 and stator 22, can obtain stable contact condition.That is to say that projection 36 contacts with rotor 23 in certain absolute fixing position.Its result, even the depth of parallelism on the two sides of rotor 23 degenerates, or the flatness of the flatness of rotor 23 or spring action portion 35 leading sections degenerates, and these mismachining tolerances also can advantageously be absorbed, and can guarantee to determine to push down the place of rotor 23 by projection 36, stable contact to rotor 23 is pressed.

Therefore, 23 pairs of stators 22 of rotor are promptly pushed down comprehensively and equably, so electrostatic capacitance is stable, can successfully produce the variation that rotor 23 rotates the electrostatic capacitance that produces, the stable position skew, and the torque inequality that rotor 23 rotates can not take place.

Also have, projection 36 carries out substantial point with rotor 23 and contacts, so the contact area of rotor 23 is diminished, the contact load on surface increases.Therefore, in this contact portion adhesion wear takes place easily, its result can increase frictional resistance, thereby can add the torque that greater trochanter 23 rotates, but the stable position skew.

Fig. 7 does not use described shell 24 for the variable capacitor of the explanation embodiment of the invention 2, and uses the stereogram of shell 40.

Shell 40 is identical with the situation of shell 24, keep 23 pairs of stators of rotor 22 rotatable, here be provided with the adjustment hole 41 that the driver bay 33 that can make rotor 23 exposes, and this adjust hole 41 around be provided with and contact with rotor 23, with the spring action portion 42 of rotor 23 to stator 22 crimping.In this spring action portion 42, also be more to the center downward-sloping shape that heals.

In spring action portion 42, for example six projections 43 are that rotation direction along rotor 23 distributes, or more desirably be provided with in the mode that is spacedly distributed.Also have, on shell 40, for example six otch 44 are to extend along the radiation direction from the marginal portion of adjusting hole 41, and these otch 44 to be distributing along rotor 23 rotation directions, or even more ideal are provided with in the mode of being spacedly distributed.So, each projection 43 is set respectively between each adjacent otch 44.

Also have, identical with the situation of shell 24, the locking piece 45 and 46 that opposite disposed is extended downwards on shell 40.Also have, the modes from extend downwards the position different with locking piece 45 and 46 set positions are provided with rotor terminal 47.

When using such shell 40, spring action portion 42 is separated into a plurality of parts by otch 44, so these each several parts that are separated can be separate and move with other parts.And, at the each several part of separating by otch 44 projection 43 is set, therefore, each projection 43 is separate with other parts, can apply spring action to rotor 23.

Thereby, can further increase the effect of projection 43.

Though more than by illustrated embodiment the present invention has been described, other all distortion also can be arranged within the scope of the invention.

For example, about the problem of number of slugs, in embodiment 1, be provided with three projections 36, and in the embodiment 2 of reference Fig. 7 explanation, be provided with six projections 43 referring to figs. 1 through Fig. 6 explanation.Like this, projection distributes more than three along the rotor rotation direction, be desirable to stable contact the with rotor, but number of lugs is also to be fine below two.In the present invention, because the existence of projection, separate part can make spring action portion contact with rotor to satisfy in many places, therefore, for example, as long as a projection is arranged, belong within the scope of the invention as if the part by beyond the projection of spring action portion being contacted with rotor, just being construed as.

Also have, in illustrated each embodiment, constitute shell 24 or 40 by metal, constitute rotor 23 by metal, therefore, itself itself formed the conducting wire of drawing rotor electrode 31, on shell 24 or 40, be provided with rotor terminal 18 or 47 simultaneously with shell 24 or 40 by rotor 23, but, should not be limited to such formation.For example, with regard to rotor, not only constitute as a whole,, also can be replaced in the mode of required part formation conductor for example with the exhausted whole formation of electricity such as aluminium by metal.Also have, with regard to shell, not only constitute as a whole, can constitute, also can be replaced in the mode of required part formation conductor by the resin medium by metal.Also have, if part beyond rotor or the part beyond the shell form the conducting wire of drawing rotor electrode, then rotor or shell no matter its whole or its a part ofly all need not constitute by metal.

Also have, projection 36 or 43 is to form by the metallic plate that constitutes shell 24 or 40 is implemented mold pressing processing, still, also can form by additive method.

Effect of the present invention is as follows.

According to the present invention, keeping rotor to stator on the rotating shell, by around adjusting hole In the set spring action section projection is set, makes this projection and rotor carry out substantial point and connect Touch, separate part contacts in many places to rotor in simultaneously spring action section, so spring is done Can apply spring action to rotor with section, thereby between rotor and stator, obtain the stable shape that contacts Attitude.

That is to say that projection contacts with rotor in certain absolute fixed position, its result, namely The depth of parallelism on the two sides of rotor is degenerated, perhaps the leading section of the flatness of rotor or spring action section Flatness degenerates, and the inequality of these processing also is conducive to be absorbed, and can guarantee to determine to be turned to by the projection pressure Press the contact of rotor so can stablize in the place of son, thereby can obtain steady between rotor and stator Fixed state.

Therefore, rotor can be pushed down stator comprehensively and equably, so electrostatic capacitance is stable, produces smoothly Give birth to the electrostatic capacitance change of rotor, the stable position skew, and can not produce the torque that rotor rotates Uneven.

Also have, projection carries out substantial point with rotor and contacts, and therefore the contact area to rotor diminishes, Increased surperficial contact load. Therefore, in this contact portion adhesion wear takes place easily, its result, Can increase frictional resistance. Thereby, can add the torque that greater trochanter rotates, the skew of stable position.

In the present invention, distributing along the rotor rotation direction arranges otch more than three, more stable cutting Mouth can be brought into play above-mentioned effect more significantly to the contact condition of rotor.

In the present invention, marginal portion the cutting along radiation direction extension of shell setting by adjusting hole Mouthful the time, spring action section is separated into a plurality of parts by otch, and the part that respectively is separated can with its His part is separate and move. Thereby each partitioned portion can be independent with other parts, and apply bullet The spring effect, and spring action section can further stablize the spring action that rotor is applied.

Also have, as mentioned above, along the radiation direction otch be set by the marginal portion of adjusting hole, simultaneously this The otch of sample will distribute along the rotor rotation direction and arrange more than three, and projection is placed in adjacent Between the otch, like this, the each several part of not only being separated by otch, each projection also all with other parts Separate and action, and can apply spring action to rotor, thus projection can further be increased Effect.

Claims (11)

1. variable capacitor, comprise: the stator that has formed stator electrode, with described stator electrode has been formed the rotor of opposed rotor electrode by medium, and for making described rotor electrode to the variation of effective opposed area of described stator electrode and keep described rotor to the rotating shell of described stator; Form the adjustment hole of the instrument that can insert the described rotor of rotating operation on described shell, setting contacts with described rotor around described adjustment hole simultaneously, and with the spring action portion of this rotor to described stator crimping; It is characterized in that being provided with in described spring action portion and carry out an a plurality of projection that contact with described rotor, thus, this spring action portion contacts in many places described rotor.

2. variable capacitor according to claim 1 is characterized in that in described spring action portion the described projection more than three that distributes along the rotation direction of described rotor being set.

3. variable capacitor according to claim 1 and 2 is characterized in that being provided with the otch that is extended along the radiation direction by the marginal portion in described adjustment hole on described shell.

4. variable capacitor according to claim 3 is characterized in that between adjacent described otch described projection being set being provided with on the described shell along the otch more than three of the rotation direction distribution of described rotor.

5. variable capacitor according to claim 1, it is characterized in that on described stator, forming 2 described stator electrodes, the stator terminal that each described stator electrode and each end surface of stator have formed is electrically connected, and described stator, described stator electrode and described stator terminal have the shape of symmetry.

6. variable capacitor according to claim 1 and 2 is characterized in that described spring action portion around described adjustment hole, is more to the center downward-sloping shape that heals.

7. variable capacitor according to claim 4 is characterized in that described spring action portion is separated into a plurality of separating parts by otch, and is separate and act between the described separating part.

8. variable capacitor according to claim 1 is characterized in that extension is provided with a plurality of locking pieces with holes on described shell.

9. variable capacitor according to claim 4 is characterized in that extension is provided with a plurality of locking pieces with holes on described shell.

10. variable capacitor according to claim 2 is characterized in that described projection is with uniformly-spaced configuration.

11. variable capacitor according to claim 4 is characterized in that described projection is with uniformly-spaced configuration.

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