KR980011544A - LC composite module with variable capacitors and variable capacitors - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides an LC composite part that simplifies and miniaturizes a part by using a variable capacitor having excellent rotor stability and the like, and has an improved shielding effect and a pollution prevention effect. The LC module includes a substrate 27 having a spatter side electrode divided into spaces on an upper main surface thereof. The dielectric rotor 40 in contact with the stator side electrode is disposed, and the rotor side electrode is formed on the upper surface of the rotor. The adjusting member 44 is provided so as to be coupled and rotated on the substrate 27, and the skirt portion 46 formed thereon is brought into contact with the substrate 27. The rotor 40 is accommodated in the skirt portion 46, and an O-shaped ring 51 is disposed between the rotor 40 and the adjusting member 44, and the rotor 40 is brought into contact with the substrate 27. Keep it in a state. A shield cover 54 having an opening 55 for accommodating the adjusting member 44 and the coil 23 therein and exposing the adjusting groove 48 is attached to the substrate 27.

Description

LC composite module with variable capacitors and variable capacitors

Since this is an open matter, no full text was included.

BACKGROUND OF THE INVENTION The present invention generally relates to microelectronic technology, and more particularly, to a variable capacitor and an LC composite component using the same. The present invention also relates to improving the support structure of a rotor for use with a variable capacitor.

15 and 16, a conventionally known kind of LC composite part or module is indicated by reference numeral 1. 17 shows an electrical equivalent circuit of a module manufactured in the prior art. The LC composite module 1 is suitable for use as an electronic component for assembly with radio frequency (RF) modulators used in certain types of electronic products such as video cassette deck devices, TV receivers and the like.

As shown in FIG. 17, the LC composite module 1 essentially includes a variable capacitor 2 and a coil 3 connected in series with each other. One end of the variable capacitor 2 is connected to the first terminal 4, the other end is connected to one end of the coil 3, and the second terminal 5 is connected therebetween. The other end of the coil 3 is connected to the third terminal 6.

As shown in FIGS. 15 and 16, the LC composite module 1 includes an electrically insulating substrate 7. Variable capacitor 2 of LC composite module 1 is an air-core capacitor with air as the main dielectric. Capacitor 2 has both rotor 8 and stator 9 supported on substrate 7.

More specifically, the rotor 8 is generally composed of a selected metal and has a plurality of rotor-side electrodes having a predetermined shape (for example, a semi-circular shape) protruding outward from the adjustment shaft 10 and the adjustment shaft 10. 11 is provided. The adjusting shaft portion 10 extends through the substrate 7. When the shaft 10 is inserted into the spring washer 12 and the stopper ring 13 on the lower side of the substrate 7, the lower edge portion of the shaft 10 is engaged, and the shaft 10 is coupled to the substrate 7 and rotates. Will be. Since the base plate 14 of the first terminal 4 is supported between the substrate 7 and the spring washer 12, the first terminal 4 is mechanically supported and floating with respect to the substrate 7, and at the same time, electrically interconnected with the rotor 8 do. At the upper end of the adjustment shaft portion 10, an adjustment groove 15 for engaging an adjustment jig or tool such as a known screw driver or the like is formed. Typically, rotor 8 consists of an integral cutting-processed component part.

The stator 9 has a plurality of stator side electrodes 16 and a plurality of spacers 17 each inserted between adjacent electrodes 16. The second terminal 5 is composed of a pillar-shaped q-rod, which is coupled to the substrate 7, penetrates the substrate 7, and passes through the stator side electrode 16 together with the spacer 17. Electrodes 16 and spacers 17 are firmly attached by soldering and bonding with the second terminal 5 to be electrically interconnected with terminal 5. When the rotor 8 rotates, the stator side electrode 16 is arranged in such a manner that the stator side electrode 16 is inserted in accordance with the space between the adjacent rotor side electrodes 11.

With this configuration, in the variable capacitor 2, the rotor side electrodes 11 and the stator side electrodes 16 face each other, and electrostatic capacitance generated between the first terminal 4 and the second terminal 5 between adjacent ones. Has an air gap defining When the rotor 8 is driven and rotates, the net overlap area of the rotor side electrode 11 and the stator side electrode 16 changes, and the resulting capacitance gradually changes.

Coil 3 is an air-core coil, one end of which is coupled to stator 9 and the other end of which penetrates through substrate 7 to constitute the third terminal. Therefore, as shown in FIG. 17, the variable capacitor 2 and the 2nd terminal 5 are connected to one end of the coil 3, and the 3rd terminal 6 is connected to the other end, and the LC composite component 1 is completed.

The LC component module manufactured in the prior art houses a variable capacitor 2 and a coil 3 therein and includes a shield cover 18 attached to the substrate 7. The shield cover 18 is provided with an opening 19 exposing an adjustment groove 15 of the adjustment shaft portion 10.

However, the structure of the LC module manufactured by the prior art has various problems, particularly with respect to the variable capacitor 2.

One problem is that the prior art can affect the generation of ambient stray capacitance. The reason is that the variable capacitor 2 uses air as the main dielectric. Since essentially an air capacitor structure is required, in order to obtain a predetermined capacitance value, the overlapping area between the rotor side electrode 11 and the stator side electrode 16 is increased, and the capacitor is essentially caused by the surrounding stray capacitance or parasitic capacitance generated in the periphery. It is easily adversely affected, resulting in poor stability and reliability.

Another problem according to the prior art is that the antifouling effect and the surrounding sealing effect of the shield cover 18 are lowered for the following reasons. The LC composite module 1 manufactured by the prior art is standardized with respect to its external size dimension and the arrangement of the terminals 4 to 6 and the position of the adjusting shaft portion 10. Therefore, especially in the state where the position of the adjustment shaft portion 10 is pre-determined, as described above, when the area of each rotor-side electrode 11 is increased, the rotor-side electrode 11 is made excessively large at a specific rotational position so that the shield cover 18 Design the part so that it protrudes outward. In order to cope with this, the shield cover 18 is provided with a window 20 which projects the rotor side electrode 11 outward. Forming window 20 on cover 18 adversely affects LC composite module 1, reducing the ambient sealing effect and the antifouling effect.

Another problem with the prior art is that it is inadequate to reduce the manufacturing cost by making the structure more complicated. One factor is that the cutting process was conventionally used to make the adjusting shaft portion 10 used with the rotor side electrode 11. Another factor is that the number of components required to form the stator side electrode 16 is increased, so that the configuration is generally complicated.

Another problem with the prior art is that the electrical conducting path extending from the rotor side electrode 11 to the first terminal 4 is smoothly electrically connected to the base 14 of the terminal 4, the adjusting shaft portion 10 and / or the spring washer 12. Corrosion RHK contamination occurs at the smooth contacts that are in contact, reducing the electrical interconnect.

Another problem is that if the adjusting shaft portion 10 is inclined at the time of capacitance adjustment and the rotor side electrode 11 and the scatterer side electrode 16 change the thickness of the air gap space defined therebetween, the resulting capacitance value is changed. As a result, the capacity adjustment gradually becomes more difficult.

It is therefore an object of the present invention to provide a structure of an LC composite component which can solve the problems faced by the prior art.

Another object of the present invention is to provide an improved variable capacitor and an LC composite component using the same.

It is another object of the present invention to provide an improved capacity-variable LC composite module which has an improved ambient sealing effect and an antifouling effect, which simplifies and reduces the size of the parts.

1 is a front view showing the LC composite module according to the first embodiment of the present invention, in which the front plate is removed for explanation, and shows the longitudinal section of the adjustment member and the shield cover.

2 is a plan view showing the LC composite module with the shield cover of FIG. 1 removed for clarity.

3 is a perspective view showing the main component elements with the coils of the components shown in FIGS. 1 and 2 removed.

4 is a perspective view of an adjustment member for use in the LC component module according to the second embodiment of the present invention.

5 is a partial plan view schematically showing a shielding cover according to a third embodiment of the present invention and an adjustment member associated therewith.

6 is a plan view illustrating a rotor in accordance with a fourth embodiment of the present invention.

FIG. 7 illustrates a fifth embodiment of the present invention and shows a part along the left half of the structure of FIG.

FIG. 8 illustrates the sixth embodiment of the present invention and shows a part according to the structure of FIG.

9 is a view illustrating a seventh embodiment of the present invention, and shows a part according to the structure of FIG.

FIG. 10 illustrates an eighth embodiment of the present invention and shows a portion according to the structure of FIG.

11 is a plan view showing a part of a shielding cover according to a ninth embodiment of the present invention and an adjustment member associated therewith.

FIG. 12 is a partial cross-sectional view of the shielding cover shown in FIG.

13 is a plan view illustrating a tenth embodiment of the present invention and showing a substrate.

14 is a plan view of a rotor coupled to the substrate of FIG.

Fig. 15 shows the internal structure of the LC composite module manufactured in the prior art, and is a partial sectional view of the substrate and the shield cover.

FIG. 16 is a bottom view of the LC composite module manufactured in the prior art shown in FIG.

FIG. 17 is an electrical equivalent circuit diagram of the LC composite module manufactured by the prior art shown in FIG.

* Explanation of symbols for main parts of the drawings

21: LC composite module 40: rotor

22: variable capacitor 42,43,70: rotor side electrode

23: coil 44: adjustment member

24: 1st terminal 45,64: shaft part

25: second terminal 46: skirt portion

26: third terminal 48: adjustment groove

27: substrate 49: push nut

28,68: first stator side electrode 50: spring washer

29,69: second stator side electrode 51: O-shaped ring

30: first lead-out electrode 52: ring-shaped groove

30a, 31a: contact portion 54: shielding cover

32: first terminal electrode 55: opening

33: second terminal electrode 61: plate portion

34: third terminal electrode 62: coil spring

36,41: bearing hole 63,65: recess

37,38,39: through hole 66: spring plate

In order to achieve the above object, the variable capacitor of the present invention includes an electrically insulating substrate having first and second stator side electrodes spaced from each other on one main surface. A rotor composed of the selected dielectric is disposed to contact the first and second stator side electrodes. The at least one rotor side electrode is supported by the rotor and has at least a portion of the rotor opposite the first and second stator side electrodes, each defining a first and second capacitance therebetween, the first and second electrostatic The capacitors are connected in series with each other. The adjustment member forms a space on the inner circumferential side for accommodating the rotor, and has a skirt portion at one distal end in contact with one main surface of the substrate at its edge side, which can be engaged with the adjustment jig or tool on the other edge side of the member. It has a shape portion for adjustment. The adjusting member can rotate about an axis perpendicular to one main surface of the substrate, and is electrically insulated with respect to the stator side electrode and the rotor side electrode (s). Contact retaining means for contacting the skirt portion of the adjusting member with one main surface of the substrate is provided. Inside the skirt portion, disposed between the adjustment member and the rotor, the rotor is continuously pressed against one main surface of the substrate, and the rotation of the adjustment member is transmitted toward the rotor to rotate the rotor with the adjustment member, And a rotation transmission member composed of an elastic body.

According to one preferred embodiment of the invention, the adjustment member comprises a shaft section forming an axis. The substrate and the rotor have a bearing opening through the shaft portion. The contact retaining means has an engagement member which engages with the shaft portion at the opposite main surface of the substrate and prevents the shaft portion from deviating from the bearing hole. A contact holding means is disposed between the opposite main surface of the substrate and the engagement member. The contact holding means may be provided with an elastic member that applies a spring pressure in the direction of separating the engagement member from the substrate.

According to another embodiment of the invention, the variable capacitor has a top or ceiling plate section opposite one main surface of the substrate and having an opening for exposing the adjustment shaped portion of the adjustment member to the outside. The contact retaining means includes a compressive member that applies spring pressure in the direction of separating the adjustment member from the ceiling plate.

According to one aspect of the invention, the rotational transmission means comprises an O-shaped ring, wherein the adjustment member has a ring-shaped groove for determining the position of the O-shaped ring therein. Further, it is preferable that the bottom of the groove is concave-convex.

According to another aspect of the present invention, on one main surface of the substrate, first and second terminal electrodes are formed. The first and second terminal electrodes are connected via first and second lead-out electrodes connected to the first and second stator side electrodes, respectively, and are disposed outside the region in contact with the skirt portion of the adjustment member. The first and second lead-out electrodes have a wider width than the other portions at the portions in contact with the adjustment member and the skirt portion.

The principles of the present invention are also suitable for LC composite parts having variable capacitors and inductive elements coupled in series. The LC part comprises a dielectric substrate having first and second stator side electrodes spaced from each other on an upper part of one main surface, a rotor, an adjusting member having at least one rotor side electrode, a skirt portion and a adjusting shape portion, a contact holding means and a rotation. And a delivery member. In addition to these components, the LC composite module includes the following components.

In addition to the first and second stator side electrodes, first to third terminal electrodes are formed on the substrate: the first and second terminal electrodes pass through the first and second lead-out electrodes connected to the first and second stator side electrodes. Are each connected; The third terminal electrode is separated in position from the first and second terminal electrodes. An induction element is coupled between the second and third terminal electrodes. The shielding cover is connected with the substrate, and the cover has an opening for exposing the adjusting shape portion of the adjusting member to the outside. A substrate is attached to the inside of the shielding cover to define an internal space holding the adjustment member and the induction element.

As shown in the accompanying drawings, these and other objects, features, and advantages of the present invention will be more particularly shown in selected embodiments of the present invention.

1 to 3 show the structure of an LC composite component according to one preferred embodiment of the invention. This part is generally referred to by reference number 21 and hereinafter referred to as LC composite module. The LC composite module 21 has an electrode circuit structure similar to that shown in FIG. The LC composite module 21 includes a variable capacitor 22 corresponding to reference number 2 shown in FIG. 17, a coil 23 corresponding to reference number 3 shown in FIG. 17, and a first terminal 24 to first point corresponding to references 4 to 6 shown in FIG. 17. Three terminals 26 are provided. The LC module 21 is designed for use in exchange with the LC modules shown in FIGS. 15 and 16.

The LC composite module 21 has a substrate 27 composed of a dielectric or selected electrically insulating material such as alumina or the like. On one main surface of the dielectric substrate 27 (upper main surface in FIG. 1 or FIG. 3), as shown in FIG. 3, the first and the second spaced apart from each other, each having a substantially semi-circular sector shape and also a circular pad shape when combined. Stator side electrode pads 28 and 29 are formed. In addition, a rectangular plate-shaped terminal pad 32 coupled to the lead electrode pattern 30 connected to the first semicircular pad 28 and a circular terminal pad 33 coupled to the lead electrode pattern 31 connected to the second semicircular pad 29 are formed on the upper main surface of the substrate. do. In addition, at a specific position of one peripheral portion of the upper main surface of the substrate 27, a third terminal pad 34 independent (electrically insulated) from the first and second pads 32, 33 is formed. As shown in FIG. 3, a special or empty electrode pad 35 is formed in the periphery on the opposite side of the upper surface of the substrate.

The electrode pads 28 to 35 on the dielectric substrate 27 are widely used in the recent widely used circular-pattern printing technique, including, for example, depositing a thin conductive paste on the substrate and patterning using a luminescent process. circuit-pattern printing technique). Preferably, after the photopatterning process, the resulting pads 28 to 35 are mirror-surface polishing treatments to improve the sett-drift and Q-factor characteristics. Should) Each of the pads 28 to 35 is a thicker multilayer conductor having a conductive paste layer laminated in two or more layers, and the substrate 27 is deformed or warped for some time along the width direction of the first and second stator side electrode pads 28 and 29. The part is subjected to an appropriate surface polishing treatment.

The substrate 27 has a through-going hole 36 defined by a pair of semi-circular stator electrode pads 28 and 29 at the center of the circular looped pattern. The bearing hole 36 acts as a bearing opening. The substrate 27 also has through-holes 37 to 39 at the center of each of the similar first to third terminal pads 32 to 34 except for the empty pad 35.

As shown in FIG. 3, a coin-like rotor plate 40 is mounted and contacted on a pair of semicircular pads 28 and 29 on the dielectric substrate 27. The rotor plate 40 is composed of a ceramic dielectric. In the center of the rotor 40, a bearing hole 41 aligned with the bearing hole 36 on the substrate 27 is formed.

As shown in Fig. 3, on the upper surface of the rotor 40, a pair of semi-circular sector electrodes 42 and 43 are formed with a substantially ring-shaped pattern and spaced apart from each other. The rotor side electrodes 42 and 43 are laminated insulated on the stator side electrode pads 28 and 29 on the substrate 27, and the ceramic rotor 40 is inserted therebetween. It is extremely important that the semicircular rotor electrode 42 oppose the first half of the two stator electrode pads 28, 29, and the other rotor electrode 43 oppose the second half of the two stator pads 28, 29. In this case, one rotor electrode 42 represents the first and second capacitances for the two pad portions 28, 29, respectively, and the capacitances are connected in series with each other. In the same aspect, the other rotor electrode 43 represents the third and fourth capacitances connected in series with respect to the pad portions 28 and 29, respectively. In addition, a similar variable capacitor having essentially pads 28, 29 and 42, 43 is described in Japanese Unexamined Utility Model Application No. 58-133926.

The first and second capacitances connected in series and the remaining third and fourth capacitances connected in series are coupled in parallel at the stator electrode pads 28 and 29; Thus, with two electrodes 42, 43 used with the rotor 40, it is possible to generally achieve an increased maximum capacitance capacitance. However, when the present invention is implemented, such a thing is not particularly required, and the rotor 40 may include only one of the electrodes 42 and 43.

The rotor electrodes 42 and 43 may be formed on the surface of the rotor plate 40 in a conductive thin film shape; Alternatively, they can also prepare metal plates or metal foils individually and form them on the surface. Alternatively, the rotor 40 has a laminated structure composed of multiple layers and can insert the rotor electrode therein; In this case, the rotor electrode can face the lower stator pads 28, 29 on the substrate 27, and may have a rotor portion having a multi-layered structure therebetween, thereby ensuring an increased mechanical strength and at the same time obtaining a maximum capacitance. have.

The columnar or cylindrical adjustment member 44 is supported on the dielectric substrate 27, and can rotate about an axis line orthogonal to the upper main surface of the substrate 27. More specifically, the adjusting member 44 has an upstanding shaft 45 that forms an axis, and the shaft 45 can be inserted into and rotated in the bearing hole 41 of the rotor 40 and the bearing hole 36 of the substrate 27.

The adjustment member 44 also forms an empty space for accommodating the rotor 40 on the inner circumferential side, and has a skirt portion 46 on the downward edge side thereof. The remaining edge side of the skirt 46 is in contact with the upward major surface of the substrate 27, giving the added benefit of eliminating or at least greatly preventing unnecessary impurities from entering or entering the interior space between the rotor 40 and the substrate 27. The adjusting member 44 forms a step-like section 47 of appropriate height on its outer circumferential wall surface, so that the diameter of the upper cylindrical portion on the skirt 46 is reduced.

It also has some surface structure at the upper edge of the adjustment member 44 that can engage an appropriate adjustment tool or jig, which is a long, linear groove 48 on the side, which can engage the tip of a negative screw driver. . The shape of the capacitor adjustment groove 48 can be freely modified as necessary.

Preferably, the adjusting member 44 is a thermoplastic resin such as (but not limited to) a polyamide resin, polybutylene terphthalate, a liquid crystal resin, polyphenylene sulfide, or alternatively a ceramic material. It is formed integrally by a casting technique using an electrically insulating material selected from among them. In the case of using a resin, for long-term use, it is preferable to use a resin having a high heat deformation temperature so as to maintain appropriate stability, durability and reliability with respect to heat treatment during soldering of the LC composite module 21.

It is not always necessary to be electrically insulating for the entire area of the adjusting member 44. The adjusting member 44 may be selectively insulating if it is electrically insulating at least in necessary parts with respect to the stator side electrode pads 28 and 29 and the rotor side electrodes 42 and 43.

The skirt 46 of the adjusting member 44 acts as a contact holding means for continuously maintaining the contact of the upper main surface of the substrate 27. In this embodiment, the skirt 46 has an engagement member that engages with the shaft portion 45 on the lower major surface of the substrate 27 and prevents the shaft portion 45 from being separated or discharged from the bearing holes 36 and 41. Here, this engagement member may be a push nut 49 as shown in FIG. 1 or FIG. 3. Push nut 49 engages shaft 45 at the lower edge; After such engagement, the nut 49 floats in engagement with the shaft 45, so that any incidental release or escape from the shaft 45 is completely eliminated.

As the contact holding means, an elastic or elastic member 50 may be used, and the member 50 may be a spring washer as shown in FIG. 3. The spring washer 50 is inserted into the shaft 45 prior to engagement with the push nut 49, and the washer 50 is disposed between the lower surface of the substrate 27 and the nut 49. Nut 49 applies a weak mechanical spring pressure to separate washer 50 from substrate 27.

Having a spring washer 50 has the advantage of ensuring that the skirt 46 is in contact with the substrate 27. If this advantage is not of great importance, in order to save work, the nut 49 is in direct contact with the lower surface of the substrate 27 without the washer 50.

In the aspect as described above, when the skirt 46 is in contact with the substrate 27, the first and second terminal electrodes 24, 25 are disposed outside the region where the skirt 46 is in contact. The skirt 46 is also in contact with the lead patterns 30 and 31 on the substrate shown in FIG. 2. Therefore, when the adjustment member 44 repeats the rotation, the frictional action is repeated between the skirt 46 and the lead electrodes 30 and 31, thereby causing unnecessary electric power failure or disconnection. In order to reduce or minimize the risk of such disconnection, in this embodiment the lead electrodes 30, 31 on the substrate are specifically configured to be able to change the line width: the 30a, 31a portions of the lead electrodes 30, 31 are the remaining portions thereof. Has a greater width. When the lead electrodes 30 and 31 have various line widths, disconnection is reduced, and at the same time, the adjusting member 44 on the substrate 27 smoothly rotates.

As shown in FIG. 1, the rotation transmission member 51 is disposed between the adjustment member 44 and the rotor 40 in the inner space of the skirt 46. The rotational transmission member 51 may be an elastic member that acts to continuously compress or compress the rotor 40 toward the upper surface of the dielectric substrate 27, thereby transmitting the rotational movement of the adjustment member 44 to the rotor 40, thereby Allow it to rotate. In this embodiment, the delivery member 51 consists of an O-shaped ring. The adjusting member 44 is formed with a ring-shaped groove 52 for adjusting the position of the O-shaped ring 51.

The friction generated between the O-shaped ring 51 and the adjusting member 44 and between the O-shaped ring 51 and the rotor 40 causes the rotor 40 to rotate with the adjusting member 44, and in that aspect, the O-shaped The elasticity of the upper ring 51 is applied, so that the rotor 40 is pressed toward the substrate 27. In order to reduce the deformation during the mounting of the O-shaped ring 51, it is preferable to carry out within a specific range lower than its elastic limit.

As shown in FIG. 1, the aforementioned first terminal 24 penetrates through the substrate 27 in the lower direction of the substrate 27 and is inserted into the through hole 37 to electrically interconnect the pad 32 of the substrate 27 with the rod 24. The base support 53 is soldered. Solder portions are not shown in the drawings for clarity.

As shown in FIGS. 2-3, coil 23 on the substrate 27 constitutes an inductive element, which in this embodiment is an air-core inductor. As will be appreciated by this skilled art, the air-coil 23 can be used in place of a chip inductor, printed wiring inductor, etc., as appropriate.

As shown in FIG. 1, a coil 23 is installed on the top surface of the dielectric substrate 27, and in this aspect, the long elongated legs of the coil are inserted into the through-hole 38, so that the terminal end thereof passes through the substrate 27 to the bottom surface. It has a protruding shape. This coil bridge is electrically interconnected with pad 33 and is coupled to pad 33 shown in FIG. The distal end of the downwardly protruding coil leg constitutes the second terminal 25 described above. The coil 23 is also inserted into the through-hole 39 existing in the center of the rectangular pad 34 on the substrate 27 and has another thin long leg downward, so that its distal end is downward of the substrate bottom as shown in FIG. Protrudes. As described above, this coil leg acts as a third terminal 26 when it is soldered and electrically coupled to the pad 34. These soldered joints are not shown in the figure. If desired, each of the second and third terminals 25, 26 may alternatively be prepared by individually preparing a conductor electrically coupled to the coil bridge.

As shown in FIG. 1, a shield cover 54 that accommodates the adjustment member 44 and the coil 23 is attached to the periphery of the substrate 27 to seal the predetermined substrate assembly. The shield cover 54 has an opening 55 exposing the adjusting groove 48 of the adjusting member 44 on its upper or ceiling plate. It is extremely important that the cover 54 does not have any window openings corresponding to the window 20 provided in the prior art structure shown in FIG. 15.

The shield cover 54 acts to protect the interior of the LC composite module 21 and at the same time seals it around to eliminate impurities. Cover 54 is made of a selected metal composed of a conductive material. The cover 54 consists essentially of four side plates with one ceiling plate and a plurality of bent cut pieces 56 and a plurality of projections 57, at the peripheral edges of the side plates of the cover 54, By tightening firmly, it can act as a stopper for determining the position of the substrate 27.

The side plate of the shield cover 54 extends downward from the bottom of the substrate 27 and holds the adjustment member 44 and the shaft portion 45 in the space formed therein. The cover 54 also forms a line portion 58 in the downward direction, which is drawn entirely thin and long from one bottom edge, to provide a ground or earth terminal.

In addition to the pure metal, the shield cover 54 may be made of a resin that is easily plated such as a liquid crystal resin, a metal plated with nickel, a conductive resin, or the like.

The LC composite module 21 thus configured provides a circuit structure as shown in FIG. 17, while the predetermined capacitance formed by the variable capacitor 22 is shown between the first and second terminals 24 and 25 shown in FIG. The inductance formed by the coil 23 is generated between the second and third terminals 25 and 26. The capacitance changes as the adjustment member 44 is rotated: As shown in FIG. 3, the adjustment member 44 is such that the gap portion between the pair of rotor electrodes 42 and 43 is perpendicular to the gap portion between the stator pads 28 and 29. When in position, has a maximum capacitance; When parallel between the gap portions, it has a minimum capacitance.

4 is a perspective view showing the lower end of the adjustment member 44 according to the second embodiment of the present invention. In this embodiment, the bottom of the ring-shaped groove 52 provided in the adjusting member 44, which determines the position of the O-shaped ring 51, is concave-convex. Due to this configuration, excessive twisting between the O-shaped ring 51 and the adjusting member 44 can be prevented, whereby the rotational torque of the adjusting member 44 can be transmitted more reliably toward the rotor 40.

FIG. 5 is a plan view schematically showing the LC composite module according to the third embodiment of the present invention, the main part of the adjusting device 44 and the shield cover 54. In this embodiment, the adjusting member 44 is designed with a stopper 59 drawn on the side. The stopper 59 sets the rotatable range of the adjusting member 44 to an angle within 360 degrees, in order to keep it in contact with the inner surface of the shielding cover 54, as indicated by a line-. . This can facilitate the user's capacitance adjusting operation. If desired, the shield cover 54 can be modified to attach a receiving stopper 59 of a particular shape to the surface corresponding to the cover 54.

6 is a top view of the rotor 40 in the fourth embodiment. In this embodiment, there is a cutout 60 at the periphery of the rotor 40. The cutting portion 60 meshes with a portion having a specific shape such as a projection (not shown) of the adjusting member 44, thereby reliably determining the position between the rotor 40 and the adjusting member 44. As shown in FIG.

FIG. 7 shows the main part corresponding to the left half of the LC composite module shown in FIG. 1 as a fifth embodiment, and the first terminal 24 is not shown. The present embodiment shown in FIG. 7 is similar to the embodiment shown in FIGS. 1 to 3 and has a coil spring 62 which acts as an elastic member that applies a mechanical spring pressure to the adjustment member 44 opposite the upper surface of the substrate 27. Thereby improving the floating property. More specifically, as shown in FIG. 7, the coil spring 62 is wound around the adjustment member 44, between the upward surface of the base flange 47 of the adjustment member 44 on the substrate and the ceiling plate 61 placed on top of the shield cover 54. Is applied to the substrate 27 when the spring pressure is continuously applied in the direction of separating the adjusting member 44 from the ceiling plate 61. This provides contact by the combination of the push nut 49 and the spring washer 50 and improves the contact retention between them.

The eighth embodiment shown in FIG. 8 is similar to the embodiment shown in FIG. 7 and removes the push nut 49 and the spring washer 50 so that the contact retaining means consist only of the coil spring 62. Since the nut 49 and washer 50 have been removed, the shaft portion 45 of the adjustment member 44 is shortened so that its lower end portion substantially protrudes with the lower surface of the substrate 27. The same is attached to shield cover 54; The cover 54 is protected by the lower main surface side of the substrate 27 and is not provided below. With such a configuration, the parts can be miniaturized.

The seventh embodiment shown in FIG. 9 is similar to the embodiment shown in FIG. 7, which removes the shaft portion 45 of the adjustment member 44, and is provided with a recess 63 on the upper main surface of the substrate 27, as shown in FIG. 9. The silver can engage with the lower end of the adjustment member 44, and the outer circumferential surface of the adjustment member can be compressed and supported on the inner wall of the recess 63 so as to rotate. Therefore, the bearing holes 36 and 41 do not need to be provided in the substrate 27 and the rotor 40.

The eighth embodiment shown in FIG. 10 is similar to the embodiment shown in FIG. 7, which removes the shaft portion 45 of the adjustment member 44 and, of course, has the shaft portion 64 on the upper major surface of the substrate 27, and the adjustment member 44 receives the shaft portion 64. It has a recess 65 to make. The shaft portion 64 is inserted into the bearing hole 41 of the rotor 40. Therefore, when the shaft portion 64 is inserted into the recessed portion 65, the adjustment member 44 is supported on the substrate 27 and can rotate.

In the present embodiments shown in FIGS. 7 to 10, the coil spring 62 is formed in an integrated state with the adjusting member 44 in an easy operation, and the spring 62 has a mold structure for receiving the assembly of the adjusting member 44. Is inserted into the.

11 and 12 are ninth embodiments, and FIG. 11 is a plan view showing a part of the shield cover 54, and FIG. 12 is a sectional view showing a part thereof in the front direction. This embodiment is similar to the embodiment shown in FIGS. 7 to 10 and uses a spring plate 66 formed on a portion of the cover 54 instead of the coil spring 62.

More specifically, as shown in FIG. 11, the shield cover 54 has a plurality of sector-shaped portions 66 (four here) having a shape cut in position around the periphery of the opening 55 exposing the groove of the adjustment member. Each sector portion is partially deformed by pressing downward on its top, forming a spring plate as shown in FIG. In its dose-adjusting groove, which shows a step section 67, indicated by the dashed line in FIG. 12, the diameter of the adjusting member 44 is reduced. The end 67 is in one plane on the base flange 47 described above. After assembly, the integrated spring plate 66 is in elastic contact with the end 67 underlying the adjustment member 44 inside the cover 54. The spring plate 66 acts on the adjustment member as a ball-like member that exerts a mechanical spring pressure in the direction in which they are separated from the ceiling cover 61, and is squeezed against the upward surface of the substrate 27 so that it is the same as the coil spring 62 in FIG. It works.

13 and 14 show a top view of the rotor 40 as a tenth embodiment, and FIG. 13 shows a top view of the dielectric substrate 27 used in the rotor. This embodiment is similar to the first embodiment shown in FIGS. 1 to 3 and has a rotor electrode 70 and stator connection pads 68 and 69 modified in a planar shape to be described later.

As shown in Fig. 13, the pair of semi-circular stator connection pads 68, 69 provided on the substrate 27 are designed to exhibit concentric inner and outer circumferential side semicircular sector shapes electrically insulated from each other. As shown in FIG. 14, the rotor electrode 70 has a substantially semi-circular sector shape. An electrode similar in form to the stator side pads 68 and 69 and the rotor side electrode 70 is described in Japanese Unexamined Utility Model Application No. 58-133926.

In the present embodiment shown in FIGS. 13 and 14, the rotor electrode 70 faces the stator side pads 68 and 69 on the underlying substrate, and the rotor 40 is inserted between the rotor electrodes 70 and the pad 68. One capacitance in between is defined and the other capacitance between electrode 70 and the remaining pad 69 is defined. These capacitances are coupled by electrode 70 in series with each other. When the stator electrode 70 stacks the front surfaces of the pads 68 and 69, the total capacitance becomes maximum, otherwise the capacitance becomes minimum.

By arbitrarily changing the center angles of the stator pads 68, 69 and the rotor electrode 70 in the range of the obtuse angle where the adjustment angle can be changed, it can be deformed into a planar shape having a sector shape other than the semicircular shape described above. In the same manner, the area ratio between the pads 68 and 69 can be changed.

As shown in Figures 13 and 14, like parts are designated by the same reference numerals. As seen in FIG. 13, the outer pad 69 is widened in position, providing an expansion area 71, 72 at its end. Special or empty pads 73 are formed on opposite sides of pads 68 and 69 on the substrate 27. Using the pad portions 71 to 73, the height difference on the substrate surface is corrected between the first half region in which the pads 68 and 69 are present and the second half region in which the pads 68 and 69 are not present. The rotational movement of the rotor 40 and the adjusting device 44 (not shown in FIGS. 13 to 14) is further smoothed, and at the same time the electrical contact area of the skirt portion 46 of the adjusting device 44 is increased, leading to the extraction electrodes 30 and 31 on the substrate 27. Has the advantage of slowly reducing the risk of unnecessary electrode interference.

One major advantage of an LC composite module with a particular variable capacitor implemented by the present invention is that it can firmly withstand the LC module against adverse effects due to ambient stray capacitance or parasitic capacitance, and can be characterized by rotor side electrode (s) and stator side electrode pads. There is no need to increase the area of the circuit, thereby increasing certainty, simplifying parts and reducing manufacturing costs. This is because if the dielectric constant is increased by providing an insulating capacitor using a specific rotor including a dielectric rather than air as in the prior art, a predetermined capacitance can be obtained.

Another advantage of the present invention is that by miniaturizing the variable capacitor, when constructing the LC composite module, by itself, there is no need to provide special window openings in the shield cover to eliminate interference of the rotor side electrode (s) or the rotor. By using this shielding cover, it is possible to maximize an appropriate contaminant prevention effect and a shielding effect.

Another advantage is that it has an improved efficiency and a certain capacity can be obtained. Since the rotor and the rotor side electrode (s) are firmly stored inside the skirt portion of the adjustment member, the risk of capacity loss due to accidental contact between the inner wall surface of the assembled shield cover and the rotor side electrode (s) never occurs. Because.

Another advantage is the improved reliability of the variable capacitor and the LC composite module using the same. This is because the electrical interconnection path used to obtain the capacitance in the component structure does not need to be formed in the movable part. The first and second capacitances are connected in series to the rotor side electrodes, the first and second capacitances opposing paired stator side electrode pads where the rotor electrode (s) are present on the substrate. Determined by the aspect.

Another advantage is that these improved variable capacitors and LC composite modules using them are manufactured using currently available manufacturing techniques, which can simplify components and reduce costs.

Another advantage is that by using the electrically insulating adjusting member, there is no need to use dielectric tools or jigs, so that the capacity adjustment can be precisely made by using a technique of rotating the adjusting member.

Another advantage of the present invention is that almost no variations or changes occur when the rotors mounted on the substrate are placed in close contact, so that the user can precisely adjust the capacity. This is for the following reason. The rotor is squeezed or pressed continuously towards the upper surface of the substrate and has a rotation-torque transmission member of elastic material therebetween. Therefore, even if the rotor is made of a dielectric that is easily disassembled, such as ceramics, the ceramic rotor bonded on the substrate is effectively prevented from being accidentally disassembled, and at the same time, even when the adjusting member is inclined when the user adjusts the capacitance, The close contact state between the substrate and the rotor cannot be changed.

Another advantage is that the adjustment member has an adjustment axis that acts as the center of rotation. The shaft portion penetrates the respective bearing holes of the substrate and the rotor, and in contact with one main surface of the substrate, the contact holding means for holding or supporting the skirt portion engages with the shaft portion on the opposite main surface of the substrate, such as a bearing member such as an engagement member. Prevents escape from leaks out or is assembled with a simplified configuration. In this state, the contact holding means is provided between the opposite main surface of the substrate and the engagement member, and has an elastic support member that applies spring pressure in a direction of separating the engagement member from the substrate, and continues the member toward the substrate. When pressed, it is possible to securely maintain a proper contact state between the substrate and the skirt when the registration is misaligned in the axial portion of the engagement member and / or when the engagement occurs in the engagement member or the engagement portion. At the same time, relatively large errors can be tolerated in terms of assembly accuracy.

A further advantage of the present invention is that the variable capacitor has a conflicting or ceiling plate portion having an opening facing one main surface of the substrate and exposing an adjusting shape portion of the adjusting member, wherein the contact holding means is provided from the ceiling plate. It may be provided with an elastic member for applying a spring pressure in the direction of separating. Also in this case, it is possible to reliably maintain the proper contact state of the substrate and the skirt portion, and at the same time, allow for a relatively large error in view of the accuracy of the assembly.

Another advantage is that the rotational torque transmission means for transmitting the rotation of the adjustment member to the rotor consists of an O-shaped ring, which allows the component manufacturer to use a commercially available composite part at low cost, thus creating the desired part. The manufacturing cost can be reduced. In addition, by forming a ring-shaped groove for determining the position of the O-shaped ring, the positive position of the O-shaped ring can be determined, and the O-shaped ring can be pre-assembled in the adjusting member, thereby allowing the variable capacitor and / or It is possible to increase the efficiency of the assembly process of the LC composite module using this.

In addition, according to the above-described embodiments, specific concave-convex portions are formed on the bottom of the adjusting groove, to prevent unnecessary twisting between the O-shaped ring and the adjusting member. This ensures transmission of the rotation of the adjustment member to the rotating device.

A further advantage of the present invention is that on one main surface of the substrate, respectively, via the first and second lead-out electrodes connected to the first and second stator electrodes, respectively, outside the region in contact with the skirt of the adjustment member. Arranged to form first and second terminal pads. In the selected portion of the lead-out electrode in contact with the skirt portion of the adjustment member, it has a wider width than the other portion, and the rotational movement of the skirt portion and the adjustment member in contact with the substrate surface becomes smooth, and the skirt repeatedly slides. In addition, since unnecessary electrical interference generated in the lead-out electrode can be suppressed, it is possible to extend the life of the variable capacitor and the LC composite module using the same.

The present invention has been shown with reference to particularly preferred embodiments, and the above-described and other changes related to shapes and details are possible by this skilled art without departing from the gist of the present invention.

Claims (8)

A variable capacitor, comprising: an electrically insulating substrate having first and second stator side electrodes spaced apart from each other on one main surface; A rotor made of a dielectric disposed in contact with the first and second stator side electrodes; Supported by the rotor, the first and second stator side electrodes are formed to face the first and second electrostatic capacitances via at least a portion of the rotor, respectively, and to form the first and second capacitances. A rotor side electrode for connecting the capacitance in series; A space for accommodating the rotor therein is formed, the cross section has a skirt portion at one end side in contact with one main surface of the substrate, and an adjustment shape portion that can be engaged with the adjustment tool on the other end side, An adjusting member that can rotate about an axis perpendicular to one main surface and is electrically insulated from the first and second stator side electrodes and the rotor side electrode; Contact holding means for maintaining a state in which the skirt portion of the adjustment member is in contact with one main surface of the substrate; And inside the skirt section, disposed between the adjustment member and the rotor, compressing the rotor toward one main surface of the substrate, and transmitting the rotation of the adjustment member to the rotor. And a rotation transmission member made of an elastic body to rotate the rotor together with the adjustment member. The said adjusting member includes the shaft part which forms said axis line, The said board | substrate and said rotor have a bearing hole which penetrates the said shaft part, The said contact holding means mentioned above And a mating member on the opposite main surface of the substrate and the substrate, the engaging member engaging with the shaft portion to prevent deviation from the bearing hole. 3. An elastic member according to claim 2, wherein said contact holding means is disposed between an opposite main surface of said substrate and said engaging member, and applies a spring pressure in a direction of separating said engaging member from said substrate. A variable capacitor comprising a. The said contact holding means of Claim 1 which further comprises the plate part which opposes one main surface of the said board | substrate, and has an opening which exposes the said adjustment shape part of the said adjustment member to the outside, The said contact holding means is a said And a pressing member for applying a spring pressure in a direction in which the plate portion and the adjustment member are separated from each other. The said rotation transmission means comprises an O-shaped ring, The ring-shaped groove which determines the position of the said O-shaped ring is provided in the inside of the said adjustment member. A variable capacitor, characterized in that formed. 6. The variable capacitor of claim 5, wherein the bottom of the groove is concave-convex. The said main surface of any one of Claim 1 thru | or 6 is connected on the one main surface of the said board | substrate via said 1st and 2nd drawing electrode from said 1st and 2nd stator side electrodes, respectively, First and second terminal electrodes are formed outside the region in contact with the skirt portion of one adjustment member, and the first and second lead-out electrodes are in contact with the skirt portion of the adjustment member. Variable capacitor, characterized in that having a wider width than. In an LC composite component, an electrically insulating substrate having first and second stator side electrodes spaced from each other on one main surface, wherein the substrate is formed of first and second stators from the first and second stator side electrodes. An electrically insulating substrate having first and second terminal electrodes connected via a lead electrode and a third terminal electrode independent of the first and second terminal electrodes, respectively; A rotor made of a dielectric disposed in contact with the first and second stator side electrodes; Supported by the rotor described above, the first and second stator side electrodes are formed to face first and second electrostatic capacitances via at least a portion of the rotor, respectively, and these first and second capacitances are respectively formed. A rotor side electrode for connecting the capacitance in series; A space for accommodating the rotor therein is formed, the cross section has a skirt portion at one end side in contact with one main surface of the substrate, and an adjustment shape portion that can be engaged with the adjustment tool on the other end side, An adjusting member that can rotate about an axis perpendicular to one main surface and is electrically insulated from the first and second stator side electrodes and the rotor side electrode; Contact holding means for maintaining a state in which the skirt portion of the adjustment member is in contact with one main surface of the substrate; Inside the skirt portion, it is disposed between the adjustment member and the rotor, and presses the rotor toward one main surface of the substrate, and transmits the rotation of the adjustment member to the rotor. A rotation transmission member composed of an elastic body for rotating the rotor together with the adjustment member; An inductor connected between the second and third terminal electrodes; And an opening for exposing the adjustment-shaped portion of the adjustment member, the shielding cover attached to the substrate that accommodates the adjustment member and the inductor therein. . ※ Note: The disclosure is based on the initial application.