JP2013106399A - Filter circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize a filter circuit.SOLUTION: A filter circuit 1 includes a dielectric film 10 formed in a belt shape, first electrodes X1 to X4, and second electrodes Y1 to Y4. The first electrodes X1 to X4 are formed on one surface of the dielectric film 10 so as to align in the longitudinal direction of the dielectric film 10, and the second electrodes Y1 to Y4 are formed on the one surface of the dielectric film 10 so as to align with the first electrodes X1 to X4. The dielectric film 10 in which these first electrodes X1 to X4 and the second electrodes Y1 to Y4 are formed is wounded, and capacitance is formed between the first electrodes by facing each other and between the second electrodes by facing each other.

Description

  The present invention relates to a filter circuit.

  Conventionally, filter circuits are used in various circuits and devices. For example, Patent Documents 1 and 2 disclose a DC power source using a filter circuit. These DC power supplies include a Cockcroft-Walton circuit that rectifies and boosts an AC voltage in addition to the filter circuit, and outputs the DC voltage by smoothing the output of the Cockcroft-Walton circuit by the filter circuit.

JP-A-8-116673 JP 2001-16853 A

  In the DC power sources disclosed in Patent Documents 1 and 2, if an AC component or noise of the AC voltage propagates to the filter circuit, a ripple occurs in the output DC voltage. Therefore, in order to prevent the AC component and noise of the AC voltage from propagating to the filter circuit, for example, in Patent Document 1, the filter circuit is shielded. However, if shielding is applied to the filter circuit, the filter circuit is enlarged, and the DC power supply cannot be reduced.

  In view of the above problems, an object of the present invention is to reduce the size of a filter circuit.

The present invention proposes the following items in order to solve the above-described problems.
(1) The present invention is a strip-shaped member having an insulating property and formed in a strip shape (for example, equivalent to the dielectric film 10 of FIG. 1), and the longitudinal direction of the strip-shaped member on one surface of the strip-shaped member. A plurality of first electrodes (for example, corresponding to the first electrodes X1 to X4 in FIG. 1) and a plurality of first electrodes formed on one surface of the belt-like member along with the plurality of first electrodes. A second electrode (e.g., corresponding to the second electrodes Y1 to Y4 in FIG. 1), the strip member is wound, and the first electrode is the first of the wound strip members. A portion on the outer peripheral side with respect to one electrode is opposed to one first electrode different from the first electrode, and a portion on the inner peripheral side with respect to the first electrode in the wound band-shaped member is sandwiched. The first electrode is opposite to the first electrode, and the first electrode is the same as the band member. The capacitances of the regions facing each other are equal, and the second electrode is different from the second electrode with a portion of the wound belt-like member on the outer peripheral side of the second electrode 1 The second electrode is opposed to one second electrode that is different from the second electrode across the portion of the wound band-shaped member on the inner peripheral side of the second electrode, and the belt-shaped member A filter circuit (for example, corresponding to the filter circuit 1 in FIG. 3) is proposed in which the capacitances of the regions where the second electrodes face each other across the member are equal.

  According to this invention, while forming the several 1st electrode on one surface of the strip | belt-shaped member, the several 2nd electrode was formed along with these 1st electrode, and this strip | belt-shaped member was wound. In addition, the first electrode is opposed to the other first electrode with a portion on the outer peripheral side of the first electrode among the strip-shaped member, and a portion of the strip-shaped member on the inner peripheral side with respect to the first electrode. Was placed opposite to the other first electrode. Similarly to the first electrode, the second electrode is opposed to the other second electrode across a portion of the strip-shaped member on the outer peripheral side of the second electrode, and from the second electrode of the strip-shaped member. Also, it was made to oppose another one of the second electrodes across the inner peripheral portion. For this reason, in the area | region where 1st electrodes oppose on both sides of a strip | belt-shaped member, a capacity | capacitance is formed and these capacity | capacitances will be in the state connected in series. Moreover, in the area | region where 2nd electrodes oppose on both sides of a strip | belt-shaped member, a capacity | capacitance is formed and these capacity | capacitances will also be in the state connected in series. Therefore, it is possible to form a filter with the first electrode and a filter with the second electrode.

  Further, the capacitances formed by the first electrode are equal, and the capacitances formed by the second electrode are also equal. For this reason, when a voltage is applied to the filter formed by the first electrode and the filter formed by the second electrode, the wound belt-shaped member has an inner peripheral portion to an outer peripheral portion or an outer peripheral portion to an inner peripheral portion. An equipotential electric field is formed toward the part. For this reason, even if it does not give a shield to these filters, it can prevent that an alternating current component and noise of an alternating current voltage propagate to these filters. Therefore, since a shield for the filter is not necessary, a filter circuit including these filters can be reduced in size.

  (2) In the filter circuit according to (1), the plurality of second electrodes are formed in pairs with the plurality of first electrodes, and each of the plurality of second electrodes includes the plurality of first electrodes. A filter circuit (for example, equivalent to the filter circuit 1A in FIG. 6) characterized by being connected to a pair of electrodes is proposed.

  According to this invention, in the filter circuit of (1), the plurality of second electrodes are formed in pairs with the plurality of first electrodes, and each of the plurality of second electrodes is paired with the pair of the plurality of first electrodes. Connected with what was provided.

  For this reason, since each capacitor formed by the first electrode and each capacitor formed by the second electrode can be connected in parallel, the above-mentioned equipotential electric field can be formed more stably, It is possible to accurately prevent the AC component of the AC voltage and noise from propagating to the filter.

  (3) The present invention has a first belt-like member (for example, equivalent to the dielectric film 11 of FIG. 9) that has an insulating property and is formed in a belt shape, and one surface of the first belt-like member, A plurality of first one electrodes (for example, corresponding to the first electrodes X11 to X13 in FIG. 9) formed side by side in the longitudinal direction of the first band member, and one surface of the first band member A plurality of second one electrodes (for example, corresponding to the second electrodes Y11 to Y13 in FIG. 9) formed side by side with the plurality of first one electrodes, and the other surface of the first strip member A plurality of first other electrodes (for example, corresponding to the first electrodes X21 and X22 in FIG. 9) formed side by side in the longitudinal direction of the first strip member, and the other surface of the first strip member A plurality of second other electrodes (for example, the second electrode of FIG. 9) formed side by side with the plurality of first other electrodes. 21 and Y22), and having a thickness and dielectric constant equal to those of the first belt-like member, and having an insulating property, and is formed in a belt-like shape in the longitudinal direction of the first belt-like member, A second belt-like member (e.g., corresponding to the dielectric film 12 of FIG. 10) that sandwiches the first other electrode and the plurality of second other electrodes with the first belt-like member. The belt-shaped member and the second belt-shaped member are wound, and the first one electrode is opposed to two adjacent ones of the plurality of first other electrodes with the first belt-shaped member interposed therebetween. The second belt-shaped member is opposed to two adjacent ones of the plurality of first other electrodes, and the first other electrode sandwiches the first belt-shaped member, and Of the first one electrode of the electrode facing two adjacent to each other In addition, the two first strip electrodes are opposed to two adjacent ones of the plurality of first one electrodes, and the first one electrode and the first one are sandwiched between the first strip members. Each capacitance in a region facing the other electrode is equal to each capacitance in a region facing the first one electrode and the first other electrode across the second strip member. The second one electrode is opposed to two adjacent ones of the plurality of second other electrodes with the first belt member interposed therebetween, and the plurality of the second belt electrodes with the second belt member interposed therebetween. The second other electrode is opposed to two adjacent to each other, and the second other electrode is opposed to two adjacent ones of the plurality of second one electrodes with the first strip-shaped member interposed therebetween. In addition, the plurality of second ones are sandwiched between the second strip members. Each of the capacitances in a region facing two of the electrodes adjacent to each other and facing the second one electrode and the second other electrode across the first band member, and the second band shape A filter circuit (for example, equivalent to the filter circuit 1C in FIG. 12) characterized in that each capacitance in a region where the second one electrode and the second other electrode oppose each other across the member is equal. Has proposed.

  According to the present invention, a plurality of first one electrodes are formed on one surface of the first belt-shaped member, and a plurality of second one electrodes are formed along with the plurality of first one electrodes. . In addition, a plurality of first other electrodes were formed on the other surface of the second belt-shaped member, and a second other electrode was formed alongside the plurality of first other electrodes. Further, the plurality of first other electrodes and the plurality of second other electrodes are sandwiched between the first belt member and the second belt member, and the first belt member and the second belt member are wound. did. The first one electrode is opposed to the two first other electrodes adjacent to each other with the first strip member interposed therebetween, and the two first other electrodes adjacent to each other and the second strip member are sandwiched therebetween. It was made to oppose. Further, the first other electrode is opposed to each other with the two first first electrodes adjacent to each other across the first strip member, and the two first first electrodes adjacent to each other and the second strip member are sandwiched therebetween. It was made to oppose. Further, the second one electrode is opposed to the two second other electrodes adjacent to each other with the first strip member interposed therebetween, and the two second other electrodes adjacent to each other and the second strip member are sandwiched between the two other second electrodes. It was made to oppose. Further, the second other electrode is opposed to the two second one electrodes adjacent to each other with the first strip member interposed therebetween, and the two second one electrodes adjacent to each other are sandwiched between the second strip electrodes. It was made to oppose.

  For this reason, in the area | region where 1st one electrode and 1st other electrode oppose on both sides of the 1st strip | belt-shaped member, a capacity | capacitance is formed and these capacity | capacitances will be in the state connected in series. A capacitor is also formed in a region where the first one electrode and the first other electrode face each other with the second strip member interposed therebetween, and these capacitors are connected in series. Also in the second one electrode and the second other electrode, similarly to the first one electrode and the first other electrode, the regions facing each other with the first belt member interposed therebetween, and the second belt member A capacitor is formed between the opposing regions. A capacitor formed by the second one electrode and the second other electrode is connected in series with the first band member interposed therebetween, and the second one electrode and the second electrode are sandwiched between the second band member. The capacitor formed by the other electrode is also connected in series. From the above, it is possible to form a filter with the first one electrode and the first other electrode, and to form a filter with the second one electrode and the second other electrode.

  Also, each capacitance of the capacitance formed by the first one electrode and the first other electrode across the first strip member, and the first one electrode and the first across the second strip member The capacitance formed by the other electrode is equal to each capacitance. Also, each capacitance of the capacitance formed by the second one electrode and the second other electrode across the first strip member, and the second one electrode and the second across the second strip member The capacitance formed by the other electrode is equal to each capacitance. Therefore, when a voltage is applied to the filter formed by the first one electrode and the first other electrode and the filter formed by the second one electrode and the second other electrode, the wound first An equipotential electric field is formed in the first belt-like member and the second belt-like member from the inner peripheral portion toward the outer peripheral portion or from the outer peripheral portion toward the inner peripheral portion. For this reason, even if it does not give a shield to these filters, it can prevent that an alternating current component and noise of an alternating current voltage propagate to these filters. Therefore, since a shield for the filter is not necessary, a filter circuit including these filters can be reduced in size.

  The capacitor formed by the first one electrode and the first other electrode across the first band member has the same first one electrode and first other electrode across the second band member. The capacitors formed by are connected in parallel. The capacitor formed by the second one electrode and the second other electrode with the first band member interposed therebetween has the same second one electrode and the second other electrode with the second band member interposed therebetween. The capacitors formed by the above are connected in parallel. For this reason, since the above-mentioned equipotential electric field can be formed more stably, it is possible to more accurately prevent the AC component and noise of the AC voltage from propagating to the filter.

  (4) In the filter circuit according to (3), the plurality of second one electrodes are formed in pairs with the plurality of first one electrodes, and the plurality of second other electrodes are A plurality of second other electrodes are formed in pairs, and each of the plurality of second one electrodes is connected to one of the plurality of first one electrodes formed in pairs, and the plurality of second electrodes Each of the other electrodes has been proposed to be connected to one of the plurality of first other electrodes formed in pairs.

  According to this invention, in the filter circuit of (3), the plurality of second one electrodes are formed in pairs with the plurality of first one electrodes, and the plurality of second other electrodes are formed as the plurality of first other electrodes. Formed in pairs with electrodes. Further, each of the plurality of second one electrodes is connected to one of the plurality of first one electrodes provided in pairs, and each of the plurality of second other electrodes is connected to the plurality of first other electrodes. It connected with what was provided in the pair among electrodes.

  For this reason, each capacitance formed by the first one electrode and the first other electrode and each capacitance formed by the second one electrode and the second other electrode can be connected in parallel. The above equipotential electric field can be formed more stably, and it is possible to accurately prevent the AC component of the AC voltage and noise from propagating to the filter.

  According to the present invention, the filter circuit can be reduced in size.

It is a front view of the planar filter circuit with which the filter circuit concerning a 1st embodiment of the present invention is provided. It is AA sectional drawing of the planar filter circuit of FIG. It is a schematic diagram of the filter circuit. It is an equivalent circuit diagram of the filter circuit. It is a front view of the planar filter circuit with which the filter circuit concerning a 2nd embodiment of the present invention is provided. It is an equivalent circuit diagram of the filter circuit. It is a front view of the planar filter circuit with which the filter circuit concerning a 3rd embodiment of the present invention is provided. It is an equivalent circuit diagram of the filter circuit. It is a front view of the planar filter circuit with which the filter circuit concerning a 4th embodiment of the present invention is provided. FIG. 10 is a cross-sectional view of the planar filter circuit of FIG. 9 taken along the line BB. FIG. 3 is an equivalent circuit diagram of the planar filter circuit. It is a schematic diagram of the filter circuit. It is an equivalent circuit diagram of the filter circuit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the constituent elements in the following embodiments can be appropriately replaced with existing constituent elements, and various variations including combinations with other existing constituent elements are possible. Accordingly, the description of the following embodiments does not limit the contents of the invention described in the claims.

<First Embodiment>
The filter circuit 1 according to the first embodiment of the present invention will be described with reference to FIGS.

  The filter circuit 1 is formed by winding the planar filter circuit 2 as will be described later with reference to FIG. As shown in FIG. 1, the planar filter circuit 2 includes a dielectric film 10 as a band-shaped member, first electrodes X1 to X4, and second electrodes Y1 to Y4.

  The dielectric film 10 has an insulating property and is formed in a strip shape. As shown in FIG. 1 and FIG. 2 which is an AA cross-sectional view of the planar filter circuit 2 of FIG. 1, the first electrodes X1 to X4 are arranged on one surface of the dielectric film 10 with this dielectric. It is formed side by side in the longitudinal direction of the film 10. As shown in FIG. 1, the second electrodes Y <b> 1 to Y <b> 4 are formed on one surface of the dielectric film 10 along with the first electrodes X <b> 1 to X <b> 4.

  By winding the above dielectric film 10 as described later, the planar filter circuit 2 is wound as shown in FIG.

  Specifically, firstly, each of the first electrodes X1 to X4 and the second electrodes Y1 to Y4 is positioned on the outer peripheral side of the portion of the wound dielectric film 10 where it is formed. Next, the dielectric film 10 is wound. According to this, the 1st electrode X1 will be located in the outer peripheral side rather than the part in which the 1st electrode X1 is formed among the wound dielectric films 10, for example.

  Second, the dielectric film 10 is wound so as to satisfy the following two conditions. The first condition is that each of the first electrodes X1 to X4 includes a portion of the wound dielectric film 10 on the outer peripheral side with respect to the portion where the first electrode X1 to X4 is formed. The first electrode X1 to X4 is different from the first electrode X1 to X4 while facing a different one from itself and sandwiching a part of the wound dielectric film 10 on the inner peripheral side of the part where the dielectric film 10 is formed. It is to face one. The second condition is that each of the second electrodes Y1 to Y4 includes a portion of the wound dielectric film 10 on the outer peripheral side of the portion where the second electrode Y1 to Y4 is formed, The second electrode Y1 to Y4 is different from itself while facing a different one from itself and sandwiching a part of the wound dielectric film 10 on the inner peripheral side of the part where the film is formed. It is to face one.

  When the dielectric film 10 is wound so as to satisfy the above two conditions, the first electrode X1 and the first electrode X2, the first electrode X2 and the first electrode X3, the first electrode X3 and the first electrode X4, the second The electrode Y1 and the second electrode Y2, the second electrode Y2 and the second electrode Y3, the second electrode Y3 and the second electrode Y4 are opposed to each other with the dielectric film 10 interposed therebetween, and a capacitance is formed in the opposed regions. The Rukoto. Hereinafter, the capacitance formed by the first electrode X1 and the first electrode X2 facing each other across the dielectric film 10 is referred to as a capacitance C11. Further, the first electrode X2 and the first electrode X3, the first electrode X3 and the first electrode X4, the second electrode Y1 and the second electrode Y2, the second electrode Y2 and the second electrode Y3, the second electrode Y3 and the second electrode. Also for Y4, the capacitors formed to face each other across the dielectric film 10 are referred to as capacitors C12, C13, C21, C22, and C23, respectively.

  The capacitors C11 to C13 are connected in series as shown in FIG. 4 and form the unit filter circuit 21. The capacitors C21 to C23 are connected in series as shown in FIG. 4 and form the unit filter circuit 22.

  Third, the dielectric film 10 is wound so as to satisfy the following two conditions. The first condition is that the area of the region where the first electrodes X1 and X2 face each other with the dielectric film 10 interposed therebetween, the area of the region where the first electrodes X2 and X3 face each other with the dielectric film 10 interposed therebetween, and the dielectric That is, the area of the region where the first electrodes X3 and X4 face each other across the film 10 is equal. The second condition is that the area of the region where the second electrodes Y1, Y2 face each other with the dielectric film 10 interposed therebetween, the area of the region where the second electrodes Y2, Y3 face each other with the dielectric film 10 interposed therebetween, and the dielectric That is, the area of the region where the second electrodes Y3 and Y4 face each other across the film 10 is equal.

  When the dielectric film 10 is wound so as to satisfy the above two conditions, the capacitances of the capacitors C11 to C13 become equal and the capacitances of the capacitors C21 to C23 become equal.

  Here, it is assumed that the first electrode X1 and the second electrode Y1 are connected to a reference potential source, and the first electrode X4 and the second electrode Y4 are connected to a potential source of 3 kV. Then, as shown in FIG. 4, the potential of the first electrode X2 becomes 1 kV, and the potential of the first electrode X3 becomes 2 kV. The potential of the second electrode Y2 is 1 kV, and the potential of the second electrode Y3 is 2 kV. For this reason, the interelectrode voltages of the capacitors C11 to C13 become equal, and the interelectrode voltages of the capacitors C21 to C23 become equal, and the filter circuit 1 has an equipotential from the inner periphery toward the outer periphery. An electric field will be formed.

  According to the above filter circuit 1, the following effects can be produced.

  The filter circuit 1 includes a unit filter circuit 21 formed by first electrodes X1 to X4 and a unit filter circuit 22 formed by second electrodes Y1 to Y4. Therefore, the unit filter circuit 21 can form a filter and the unit filter circuit 22 can form a filter.

  In the filter circuit 1, the capacitances of the capacitors C11 to C13 formed by the first electrodes X1 to X4 are equal, and the capacitances of the capacitors C21 to C23 formed by the second electrodes Y1 to Y4 are the same. The capacity is equal. For this reason, when a voltage is applied between one end and the other end of the unit filter circuit 21, the voltage between the electrodes of the capacitors C11 to C13 becomes equal. Further, when a voltage is applied between one end and the other end of the unit filter circuit 22, the interelectrode voltages of the capacitors C21 to C23 become equal. Therefore, an equipotential electric field is formed in the filter circuit 1 from the inner periphery to the outer periphery or from the outer periphery to the inner periphery. Therefore, even if the unit filter circuits 21 and 22 are not shielded, it is possible to prevent the AC component and noise of the AC voltage from propagating to the unit filter circuits 21 and 22. Accordingly, since the shield for the filter is not necessary, the filter circuit 1 can be reduced in size.

Second Embodiment
A filter circuit 1A according to a second embodiment of the present invention will be described with reference to FIGS. The filter circuit 1A is different from the filter circuit 1 according to the first embodiment of the present invention in that a planar filter circuit 2A is provided instead of the planar filter circuit 2. The planar filter circuit 2 </ b> A differs from the planar filter circuit 2 in that it includes third electrodes Z <b> 2 to Z <b> 4, resistors R <b> 11, R <b> 12, R <b> 21, R <b> 22, R <b> 31, R <b> 32, and instead of the dielectric film 10. The point provided with 10 A of dielectric films and the point provided with the reference electrode G0 instead of the 1st electrode X1 and the 2nd electrode Y1 differ. In the filter circuit 1A, the same components as those of the filter circuit 1 are denoted by the same reference numerals, and the description thereof is omitted.

  The dielectric film 10A has an insulating property and is formed in a strip shape. As shown in FIG. 5, the reference electrode G0 and the first electrodes X2 to X4 are formed on one surface of the dielectric film 10A so as to be aligned in the longitudinal direction of the dielectric film 10A. The second electrodes Y2 to Y4 are formed side by side with the first electrodes X2 to X4 on one surface of the dielectric film 10A. The third electrodes Z2 to Z4 are formed side by side with the second electrodes Y2 to Y4 on one surface of the dielectric film 10A.

  The reference electrode G0 is formed so that the length in the short direction of the dielectric film 10A is longer than each of the first electrodes X2 to X4. The reference electrode G0 is on a straight line connecting the first electrodes X2 to X4. And also on a straight line connecting the second electrodes Y2 to Y4 and on a straight line connecting the third electrodes Z2 to Z4.

  The resistor R11 connects the first electrode X2 and the second electrode Y2, and the resistor R12 connects the second electrode Y2 and the third electrode Z2. The resistor R21 connects the first electrode X3 and the second electrode Y3, and the resistor R22 connects the second electrode Y3 and the third electrode Z3. The resistor R31 connects the first electrode X4 and the second electrode Y4, and the resistor R32 connects the second electrode Y4 and the third electrode Z4.

  The planar filter circuit 2A is wound in the same manner as the planar filter circuit 2 by winding the above dielectric film 10A as described later.

  Specifically, first, each of the reference electrode G0, the first electrodes X2 to X4, the second electrodes Y2 to Y4, and the third electrodes Z2 to Z4 is formed of the wound dielectric film 10A. 10 A of dielectric films are wound so that it may be located in the outer peripheral side rather than the part currently performed.

  Second, the dielectric film 10A is wound so as to satisfy the following three conditions. The first condition is that each of the reference electrode G0 and the first electrodes X2 to X4 sandwiches a portion of the wound dielectric film 10A on the outer peripheral side with respect to the portion where the electrode is formed, and the reference electrode G0 and While facing one of the first electrodes X2 to X4 that is different from the first electrode X2 to X4, the reference electrode G0 and the first electrode are sandwiched between the wound dielectric film 10A and the portion on the inner peripheral side of the portion where the film is formed. This means that one electrode X2 to X4 is opposed to one different from itself. The second condition is that each of the reference electrode G0 and the second electrodes Y2 to Y4 sandwiches a portion of the wound dielectric film 10A on the outer peripheral side with respect to a portion on which the reference electrode G0 and the second electrode Y2 to Y4 are formed. While facing one of the second electrodes Y2 to Y4 which is different from itself, the reference electrode G0 and the first electrode are sandwiched between the wound dielectric film 10A and the portion on the inner peripheral side with respect to the portion where the film is formed. This means that it is opposed to one of the two electrodes Y2 to Y4 that is different from itself. The third condition is that each of the reference electrode G0 and the third electrodes Z2 to Z4 sandwiches a portion of the wound dielectric film 10A on the outer peripheral side with respect to the portion where the electrode is formed, While facing one of the third electrodes Z2 to Z4 that is different from itself, the reference electrode G0 and the first electrode are sandwiched between the wound dielectric film 10A and the portion on the inner peripheral side of the portion where the film is formed. This means that one of the three electrodes Z2 to Z4 is opposed to one different from itself.

  When the dielectric film 10A is wound so as to satisfy the above three conditions, the reference electrode G0 and the first electrode X2, the first electrode X2 and the first electrode X3, the first electrode X3 and the first electrode X4, and the reference electrode G0. And second electrode Y2, second electrode Y2 and second electrode Y3, second electrode Y3 and second electrode Y4, reference electrode G0 and third electrode Z2, third electrode Z2 and third electrode Z3, third electrode Z3 The third electrodes Z4 are opposed to each other with the dielectric film 10A interposed therebetween, and a capacitance is formed in the opposed regions. Hereinafter, a capacitor formed by the reference electrode G0 and the first electrode X2 facing each other with the dielectric film 10A interposed therebetween is referred to as a capacitor C10. Further, the reference electrode G0 and the second electrode Y2, the reference electrode G0 and the third electrode Z2, the third electrode Z2 and the third electrode Z3, and the third electrode Z3 and the third electrode Z4 are also opposed with the dielectric film 10A interposed therebetween. The capacitors formed in this way are referred to as capacitors C20, C30, C32, and C33, respectively.

  The capacitors C10, C12, and C13 are connected in series as shown in FIG. 6 to form the unit filter circuit 21A. Further, the capacitors C20, C22, and C23 are connected in series as shown in FIG. 6 to form the unit filter circuit 22A. Further, the capacitors C30, C32, and C33 are connected in series as shown in FIG. 6 to form the unit filter circuit 23A.

  Here, as described above, the resistor R11 connects the first electrode X2 and the second electrode Y2. For this reason, the capacitors C10 and C20 are connected in parallel via the resistor R11. Further, the capacitors C20 and C30 are connected in parallel via the resistor R12. Capacitors C12 and C22 are connected in parallel via resistors R11 and R21, and capacitors C22 and C32 are connected in parallel via resistors R12 and R22. Capacitors C13 and C23 are connected in parallel via resistors R21 and R31, and capacitors C23 and C33 are connected in parallel via resistors R22 and R32.

  Third, the dielectric film 10A is wound so as to satisfy the following three conditions. The first condition is that the area of the area where the reference electrode G0 and the first electrode X2 face each other with the dielectric film 10A interposed therebetween, and the area of the area where the first electrodes X2 and X3 face each other across the dielectric film 10A In other words, the area of the region where the first electrodes X3 and X4 face each other across the dielectric film 10A is equal. The second condition is that the area of the region where the reference electrode G0 and the second electrode Y2 face each other with the dielectric film 10A interposed therebetween, and the area of the region where the second electrodes Y2, Y3 face each other with the dielectric film 10A interposed therebetween. In other words, the area of the region where the second electrodes Y3 and Y4 face each other across the dielectric film 10A is equal. The third condition is that the area of the region where the reference electrode G0 and the third electrode Z2 face each other with the dielectric film 10A interposed therebetween, and the area of the region where the third electrodes Z2, Z3 face each other with the dielectric film 10A interposed therebetween. In other words, the area of the region where the third electrodes Z3 and Z4 face each other across the dielectric film 10A is equal.

  When the dielectric film 10A is wound so as to satisfy the above three conditions, the capacitances of the capacitors C10, C12, and C13 become equal. Further, the capacitances of the capacitors C20, C22, and C23 are also equal, and the capacitances of the capacitors C30, C32, and C33 are also equal.

  According to the above filter circuit 1A, in addition to the above-described effects that can be achieved by the filter circuit 1, the following effects can be achieved.

  In the filter circuit 1A, the capacitors C10 and C20 are connected in parallel via a resistor R11, and the capacitors C20 and C30 are connected in parallel via a resistor R12. Capacitors C12 and C22 are connected in parallel via resistors R11 and R21, and capacitors C22 and C32 are connected in parallel via resistors R12 and R22. Capacitors C13 and C23 are connected in parallel via resistors R21 and R31, and capacitors C23 and C33 are connected in parallel via resistors R22 and R32. Therefore, by making the resistance values of the resistors R11, R12, R21, R22, R31, and R32 equal, the ratio of the interelectrode voltages of the capacitors C10, C12, and C13 and the capacitances C20, C22, and C23, respectively. It is possible to make the ratio of the inter-electrode voltages of the electrodes and the ratio of the inter-electrode voltages of the capacitors C30, C32, C33 equal. According to this, in the filter circuit 1A, an equipotential electric field can be formed more stably than in the filter circuit 1, and an AC component or noise of an AC voltage propagates to the unit filter circuits 21A, 22A, and 23A. Can be prevented accurately.

<Third Embodiment>
A filter circuit 1B according to a third embodiment of the present invention will be described with reference to FIGS. The filter circuit 1B is different from the filter circuit 1A according to the second embodiment of the present invention in that the filter circuit 1B includes a planar filter circuit 2B instead of the planar filter circuit 2A. The planar filter circuit 2B is different from the planar filter circuit 2A in that it includes the fourth electrodes M1 to M4, the diodes D1 to D6, and the dielectric film 10B instead of the dielectric film 10A. Is different. In the filter circuit 1B, the same components as those of the filter circuit 1A are denoted by the same reference numerals, and the description thereof is omitted.

  The dielectric film 10B has an insulating property and is formed in a strip shape. On one surface of the dielectric film 10B, the reference electrode G0, the first electrodes X2 to X4, the second electrodes Y2 to Y4, the third electrodes Z2 to Z4, the resistor R11, similarly to the one surface of the dielectric film 10A, R12, R21, R22, R31, and R32 are formed, and the fourth electrodes M1 to M4 are formed side by side with the reference electrode G0 and the first electrodes X2 to X4.

  The reference electrode G0 is connected to the anode of the diode D1, and the fourth electrode M2 is connected to the cathode of the diode D1. The fourth electrode M2 is connected to the anode of the diode D2, and the first electrode X2 is connected to the cathode of the diode D2. The first electrode X2 is connected to the anode of the diode D3, and the fourth electrode M3 is connected to the cathode of the diode D3. The fourth electrode M3 is connected to the anode of the diode D4, and the first electrode X3 is connected to the cathode of the diode D4. The first electrode X3 is connected to the anode of the diode D5, and the fourth electrode M4 is connected to the cathode of the diode D5. The fourth electrode M4 is connected to the anode of the diode D6, and the first electrode X4 is connected to the cathode of the diode D6.

  By winding the above dielectric film 10B as described later, the planar filter circuit 2B is wound in the same manner as the planar filter circuit 2A.

  Specifically, first, a dielectric in which each of the reference electrode G0, the first electrodes X2 to X4, the second electrodes Y2 to Y4, the third electrodes Z2 to Z4, and the fourth electrodes M1 to M4 is wound. The dielectric film 10B is wound so as to be positioned on the outer peripheral side of the portion of the film 10B where the film 10B is formed.

  Second, the dielectric film 10B is wound so as to satisfy the following four conditions. The first condition is that each of the reference electrode G0 and the first electrodes X2 to X4 sandwiches a portion of the wound dielectric film 10B on the outer peripheral side with respect to the portion where the electrode is formed, and the reference electrode G0 and While facing one of the first electrodes X2 to X4 that is different from the first electrode X2 to X4, the reference electrode G0 and the first electrode This means that one electrode X2 to X4 is opposed to one different from itself. The second condition is that each of the reference electrode G0 and the second electrodes Y2 to Y4 sandwiches the outer peripheral portion of the wound dielectric film 10B with respect to the portion where the reference electrode G0 and the second electrode Y2 to Y4 are formed. The second electrode Y2 to Y4 is opposed to one different from itself, and the reference electrode G0 and the second electrode are sandwiched between the wound dielectric film 10B and the inner peripheral portion of the dielectric film 10B. This means that it is opposed to one of the two electrodes Y2 to Y4 that is different from itself. The third condition is that each of the reference electrode G0 and the third electrodes Z2 to Z4 sandwiches a portion of the wound dielectric film 10B on the outer peripheral side with respect to the portion where the electrode is formed, While facing one of the third electrodes Z2 to Z4 that is different from itself, the reference electrode G0 and the first electrode are sandwiched between the wound dielectric film 10B and the portion on the inner circumference side of the portion where the film is formed. This means that one of the three electrodes Z2 to Z4 is opposed to one different from itself. The fourth condition is that each of the fourth electrodes M1 to M4 includes a portion of the wound dielectric film 10B on the outer peripheral side with respect to a portion of the fourth electrode M1 to M4 sandwiched between the portions where the electrodes are formed. 1 opposite to one of the fourth electrodes M <b> 1 to M <b> 4 while facing one different from itself and sandwiching a portion of the wound dielectric film 10 </ b> B on the inner peripheral side from the portion where the film is formed. It is to face one.

  When the dielectric film 10B is wound so as to satisfy the above four conditions, the capacitors C10, C12, C13, C20, C22, C23, C30, C32, C33 are formed in the same manner as when the dielectric film 10A is wound. Will be formed. Further, the fourth electrode M1 and the fourth electrode M2, the fourth electrode M2 and the fourth electrode M3, the fourth electrode M3 and the fourth electrode M4 are opposed to each other with the dielectric film 10B interposed therebetween, and in the regions facing each other, Capacitors C1, C2, and C3 are formed. These capacitors C1 to C3 are connected in series as shown in FIG. 8 to form a unit filter circuit 24A. Further, the capacitors C1 to C3 and the capacitors C10, C12, and C13 form a Cockcroft-Walton circuit with the diodes D1 to D6.

  Capacitor C10 has diodes D1 and D2 connected in series, and capacitor C2 has diodes D2 and D3 connected in series, and capacitor C12 has diodes D3 and D4 connected in series. The diodes D4 and D5 connected in series are connected in parallel to the capacitor C3, and the diodes D5 and D6 connected in series are connected in parallel to the capacitor C13. The capacitor C1 is connected in parallel with a diode D1 and an AC power supply AC connected in series.

  It is assumed that the forward voltages of the diodes D1 to D6 are equal.

  Third, the dielectric film 10B is wound so as to satisfy the following four conditions. The first condition is that the area of the region where the reference electrode G0 and the first electrode X2 face each other with the dielectric film 10B interposed therebetween, and the area of the region where the first electrodes X2 and X3 face each other with the dielectric film 10B interposed therebetween. In other words, the area of the region where the first electrodes X3 and X4 face each other across the dielectric film 10B is equal. The second condition is that the area of the region where the reference electrode G0 and the second electrode Y2 face each other with the dielectric film 10B interposed therebetween, and the area of the region where the second electrodes Y2, Y3 face each other with the dielectric film 10B interposed therebetween. In other words, the area of the region where the second electrodes Y3 and Y4 face each other across the dielectric film 10B is equal. The third condition is that the area of the region where the reference electrode G0 and the third electrode Z2 face each other with the dielectric film 10B interposed therebetween, and the area of the region where the third electrodes Z2, Z3 face each other with the dielectric film 10B interposed therebetween. In other words, the area of the region where the third electrodes Z3 and Z4 face each other across the dielectric film 10B is equal. The fourth condition is that the area of the region where the fourth electrodes M1, M2 face each other with the dielectric film 10B interposed therebetween, the area of the region where the fourth electrodes M2, M3 face each other with the dielectric film 10B interposed therebetween, and the dielectric That is, the area of the region where the fourth electrodes M3 and M4 face each other across the film 10B is equal.

  When the dielectric film 10B is wound so as to satisfy the above four conditions, the capacitances of the capacitors C10, C12, and C13 become equal. The capacitances of the capacitors C20, C22, and C23 are also equal, the capacitances of the capacitors C30, C32, and C33 are also equal, and the capacitances of the capacitors C1 to C3 are also equal.

  According to the above filter circuit 1B, in addition to the above-described effects that can be achieved by the filter circuit 1A, the following effects can be achieved.

  In the filter circuit 1B, a Cockcroft-Walton circuit is formed by the capacitors C1 to C3, C10, C12, and C13 and the diodes D1 to D6. The capacitances of the capacitors C1 to C3 are equal, and the capacitances of the capacitors C10, C12, and C13 are equal. Therefore, a high voltage is generated by the Cockcroft-Walton circuit and the AC power supply AC while preventing the voltage between the electrodes from exceeding the withstand voltage only in a specific capacity among the capacitors C1 to C3, C10, C12, and C13. be able to.

<Fourth embodiment>
A filter circuit 1C according to a fourth embodiment of the present invention will be described with reference to FIGS. The filter circuit 1C is different from the filter circuit 1 according to the first embodiment of the present invention in that a planar filter circuit 2C is provided instead of the planar filter circuit 2. The planar filter circuit 2C is different from the planar filter circuit 2 in that electrodes are formed not only on one surface of the dielectric film but also on the other surface. Specifically, the planar filter circuit 2C is different from the planar filter circuit 2 in that the first electrodes X11 to X13, X21, and X22 are provided instead of the first electrodes X1 to X4, and the second electrodes Y1 to Y4. The difference is that the second electrodes Y11 to Y13, Y21, and Y22 are provided instead of the dielectric film 10, and the dielectric films 11 and 12 are provided instead of the dielectric film 10.

  The dielectric film 11 has an insulating property and is formed in a strip shape. As shown in FIG. 9 and FIG. 10 which is a BB cross-sectional view of the planar filter circuit 2 </ b> C of FIG. 9, the first electrodes X <b> 11 to X <b> 13 are disposed on one surface of the dielectric film 11. It is formed side by side in the longitudinal direction of the film 11. In the planar filter circuit 2C of FIG. 9, the dielectric film 12 is not shown for convenience. As shown in FIG. 9, the second electrodes Y11 to Y13 are formed on one surface of the dielectric film 11 along with the first electrodes X11 to X13.

  As shown in FIGS. 9 and 10, the first electrodes X <b> 21 and X <b> 22 are formed on the other surface of the dielectric film 11 side by side in the longitudinal direction of the dielectric film 11. As shown in FIG. 9, the second electrodes Y21 and Y22 are formed on the other surface of the dielectric film 11 along with the first electrodes X21 and X22.

  The first electrode X12 faces the first electrodes X21 and X22 adjacent to each other with the dielectric film 11 in between.

  Each of the first electrodes X21 and X22 faces two adjacent ones of the first electrodes X11 to X13 with the dielectric film 11 in between. Specifically, the first electrode X21 faces the first electrodes X11 and X12, and the first electrode X22 faces the first electrodes X12 and X13 with the dielectric film 11 in between.

  The first electrode X11 and the first electrode X21, the first electrode X21 and the first electrode X12, the first electrode X12 and the first electrode X22, and the first electrode X22 and the first electrode X13 sandwich the dielectric film 11, respectively. Capacitors C41 to C44 are formed in the opposing regions. The capacitors C <b> 41 to C <b> 44 are connected in series as shown in FIG. 11 and form the unit filter circuit 25.

  The area of the region where the first electrodes X11 and X21 face each other with the dielectric film 11 interposed therebetween, the area of the region where the first electrodes X21 and X12 face each other with the dielectric film 11 interposed therebetween, and the dielectric film 11 sandwiched therebetween. Thus, it is assumed that the area of the region where the first electrodes X12 and X22 face each other is equal to the area of the region where the first electrodes X22 and X13 face each other across the dielectric film 11. For this reason, the capacitances of the capacitors C41 to C44 are equal.

  The second electrode Y12 faces the second electrodes Y21 and Y22 adjacent to each other with the dielectric film 11 in between.

  Each of the second electrodes Y21 and Y22 faces two adjacent ones of the second electrodes Y11 to Y13 with the dielectric film 11 in between. Specifically, the second electrode Y21 faces the second electrodes Y11 and Y12, and the second electrode Y22 faces the second electrodes Y12 and Y13 with the dielectric film 11 in between.

  The second electrode Y11 and the second electrode Y21, the second electrode Y21 and the second electrode Y12, the second electrode Y12 and the second electrode Y22, and the second electrode Y22 and the second electrode Y13 sandwich the dielectric film 11, respectively. Capacitors C51 to C54 are formed in the opposing regions. Capacitors C51 to C54 are connected in series as shown in FIG. 11, and form a unit filter circuit 26.

  The area of the region where the second electrodes Y11 and Y21 face each other with the dielectric film 11 interposed therebetween, the area of the region where the second electrodes Y21 and Y12 face each other with the dielectric film 11 sandwiched therebetween, and the dielectric film 11 sandwiched Thus, it is assumed that the area of the region where the second electrodes Y12, Y22 face each other and the area of the region where the second electrodes Y22, Y13 face each other across the dielectric film 11 are equal. For this reason, the capacitances of the capacitors C51 to C54 are equal.

  Returning to FIG. 10, the dielectric film 12 has a thickness and a dielectric constant equal to those of the dielectric film 11, has an insulating property, and is formed in a strip shape in the longitudinal direction of the dielectric film 11. The dielectric film 11 and the dielectric film 12 sandwich the first electrodes X21 and X22 and the second electrodes Y21 and Y22.

  By winding the above dielectric films 11 and 12 as described later, the planar filter circuit 2C is wound as shown in FIG.

  Specifically, firstly, each of the first electrodes X11 to X13 and the second electrodes Y11 to Y13 is located on the outer peripheral side of the portion of the wound dielectric film 11 where it is formed. The dielectric film 11, so that each of the first electrodes X21, X22 and the second electrodes Y21, Y22 is located on the inner peripheral side of the portion of the wound dielectric film 11 where it is formed. Wind 12

  Second, the dielectric films 11 and 12 are wound so as to satisfy the following two conditions. The first condition is that the first electrodes X21 and X22 adjacent to each other and the first electrode X12 face each other across the dielectric film 12, and the first electrodes X12 and X13 adjacent to each other and the first electrode X22 are adjacent to each other. It is to face each other. The second condition is that the second electrode Y21, Y22 and the second electrode Y12 adjacent to each other face each other with the dielectric film 12 interposed therebetween, and the second electrode Y12, Y13 and the second electrode Y22 adjacent to each other are It is to face each other.

  When the dielectric films 11 and 12 are wound so as to satisfy the above two conditions, the first electrode X21 and the first electrode X12, the first electrode X12 and the first electrode X22, the first electrode X22 and the first electrode X13, The second electrode Y21 and the second electrode Y12, the second electrode Y12 and the second electrode Y22, the second electrode Y22 and the second electrode Y13 are opposed to each other with the dielectric film 12 interposed therebetween, and in the opposed region, the capacitance C61 -C63, C71-C73 will be formed.

  The capacitors C61 to C63 and C71 to C73 are connected in series as shown in FIG. Here, similarly to the capacitor C42, the capacitor C61 is formed by the first electrode X21 and the first electrode X12. For this reason, the capacitor C61 can be regarded as being connected in parallel with the capacitor C42. Similarly to the capacitor C61, the capacitors C62, C63, and C71 to C73 can be regarded as being connected in parallel with the capacitors C43, C44, and C52 to C54, respectively. Hereinafter, the unit filter circuit 25 in which the capacitors C61 to C63 are connected in parallel to the capacitors C42 to C44 will be referred to as a unit filter circuit 25A. The unit filter circuit 26 in which the capacitors C71 to C73 are connected in parallel to the capacitors C52 to C54 will be referred to as a unit filter circuit 26A.

  Third, the dielectric films 11 and 12 are wound so as to satisfy the following two conditions. The first condition is that the area of the region where the first electrodes X21, X12 face each other with the dielectric film 12 interposed therebetween, the area of the region where the first electrodes X12, X22 face each other with the dielectric film 12 interposed therebetween, and the dielectric The area of the region where the first electrodes X22 and X13 are opposed to each other with the film 12 interposed therebetween, the area of the region where the first electrodes X11 and X21 are opposed to each other with the dielectric film 11 interposed therebetween, and the first electrode across the dielectric film 11 The area of the region where X21 and X12 face each other, the area of the region where the first electrodes X12 and X22 face each other across the dielectric film 11, and the region where the first electrodes X22 and X13 face each other across the dielectric film 11 It means that the area becomes equal. The second condition is that the area of the region where the second electrodes Y21, Y12 face each other with the dielectric film 12 interposed therebetween, the area of the region where the second electrodes Y12, Y22 face each other across the dielectric film 12, and the dielectric The area of the region where the second electrodes Y22, Y13 face each other with the film 12 interposed therebetween, the area of the region where the second electrodes Y11, Y21 face each other with the dielectric film 11 interposed therebetween, and the second electrode with the dielectric film 11 interposed therebetween The area of the area where Y21 and Y12 face each other, the area of the area where the second electrodes Y12 and Y22 face each other across the dielectric film 11, and the area where the second electrodes Y22 and Y13 face each other across the dielectric film 11 It means that the area becomes equal.

  When the dielectric films 11 and 12 are wound so as to satisfy the above two conditions, the capacitances of the capacitors C61 to C63 are equalized, and the capacitances of the capacitors C71 to C73 are also equalized.

  Here, as described above, the thickness and dielectric constant of the dielectric film 12 are equal to the thickness and dielectric constant of the dielectric film 11, respectively, and the first electrodes face each other with the dielectric film 11 in between. And the area of the region where the first electrodes face each other across the dielectric film 12, the area of the region where the second electrodes face each other across the dielectric film 11, and the dielectric The area of the region where the second electrodes face each other across the film 12 is equal. Therefore, the capacitances of the capacitors C61 to C63 are equal to the capacitances of the capacitors C41 to C44, and the capacitances of the capacitors C71 to C73 are the capacitances of the capacitors C51 to C54. Is equal to

  According to the above filter circuit 1C, in addition to the above-described effects that the filter circuit 1 can exhibit, the following effects can be achieved.

  In the filter circuit 1C, the capacitors C61 to C63 having the same capacitance are connected in parallel to the capacitors C42 to C44, respectively, and the capacitors C71 to C73 having the same capacitance are respectively connected to the capacitors C52 to C54. Are connected in parallel. For this reason, since the filter circuit 1C can form an equipotential electric field more stably than the filter circuit 1, the AC component and noise of the AC voltage propagate to the unit filter circuits 25A and 26A. Can be prevented more accurately.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made without departing from the gist of the present invention.

  For example, in each of the above-described embodiments, a dielectric film is used as a band-shaped member that has insulating properties and is formed in a band shape. This dielectric film may be formed of, for example, a polyimide film. Moreover, you may form the above-mentioned strip | belt-shaped member with a ceramic, for example.

  In the fourth embodiment described above, the first electrodes X11 to X13, X21, and X22 and the second electrodes Y11 to Y13, Y21, and Y22 are formed on the dielectric film 11. However, the present invention is not limited to this. For example, the first electrodes X11 to X13 and the second electrodes Y11 to Y13 are formed on one surface of the dielectric film 11, and the first electrodes X21 and X22 and the second electrodes Y21 and Y22 are formed on one side of the dielectric film 12. The first electrode X21, X22 and the second electrode Y21, Y22 may be sandwiched between the dielectric film 11 and the dielectric film 12.

  In the first embodiment described above, four first electrodes X1 to X4 and four fourth electrodes Y2 to Y4 are formed on the dielectric film 10. The number of first electrodes and second electrodes formed on the film 10 is not limited to four and may be any number. Moreover, also in the above-mentioned 2nd Embodiment, 3rd Embodiment, and 4th Embodiment, the number of the electrodes formed in a dielectric film may be arbitrary numbers.

  In the first embodiment described above, the area of the region where the first electrodes X1 and X2 face each other with the dielectric film 10 interposed therebetween, and the area of the region where the first electrodes X2 and X3 face each other with the dielectric film 10 interposed therebetween. The dielectric film 10 is wound so that the area of the region where the first electrodes X3 and X4 are opposed to each other with the dielectric film 10 interposed therebetween is equal, but not limited to this, each of the capacitors C11 to C13 What is necessary is just to wind the dielectric film 10 so that an electrostatic capacitance may become equal.

  In the fourth embodiment described above, the thickness and dielectric constant of the dielectric films 11 and 12 are equal, and the area of the region where the electrodes face each other with the dielectric film 11 interposed therebetween, and the dielectric film 12 sandwiched However, the area of the region where the electrodes face each other is assumed to be equal, but this is not restrictive. If the capacitance of the capacitor formed by sandwiching the dielectric film 11 is equal to the capacitance of the capacitor formed by sandwiching the dielectric film 12, the dielectric film 11 and the dielectric film 12 The thickness and the dielectric constant may be different, or the areas of the opposed regions of the electrodes may be different.

1, 1A, 1B, 1C; filter circuit 2, 2A, 2B, 2C; planar filter circuit 10, 10A, 10B, 11, 12; dielectric film 21, 22, 25, 26, 21A to 26A; unit filter circuit C1-C3, C10-C13, C20-C23, C30-C33, C41-C44, C51-C54, C61-C63, C71-C73; Capacitance G0; Reference electrodes X1-X4, X11-X13, X21, X22; 1 electrode Y1-Y4, Y11-Y13, Y21, Y22; 2nd electrode Z2-Z4; 3rd electrode M1-M4; 4th electrode

Claims (4)

A band-shaped member having insulation and formed in a band shape;
A plurality of first electrodes formed on one surface of the belt-like member in a longitudinal direction of the belt-like member;
A plurality of second electrodes formed side by side with the plurality of first electrodes on one surface of the belt-shaped member;
The strip member is wound,
The first electrode is opposed to one first electrode different from the first electrode across a portion of the wound band-shaped member on the outer peripheral side of the first electrode and is wound. The belt-shaped member is opposed to one first electrode different from the first electrode across the inner peripheral portion of the first electrode,
Capacitances of regions where the first electrodes face each other across the belt-like member are equal,
The second electrode is opposed to one second electrode different from the second electrode across the portion of the wound band-shaped member on the outer peripheral side of the second electrode, and the wound The band-shaped member is opposed to one second electrode different from the second electrode across the inner peripheral portion of the second electrode,
Each of the electrostatic capacitances in a region where the second electrodes oppose each other with the belt-like member interposed therebetween is equal to the filter circuit. The plurality of second electrodes are formed in pairs with the plurality of first electrodes,
2. The filter circuit according to claim 1, wherein each of the plurality of second electrodes is connected to one of the plurality of first electrodes formed in a pair. A first belt-like member having insulation and formed in a belt shape;
A plurality of first one electrodes formed on one surface of the first belt-like member in a longitudinal direction of the first belt-like member;
A plurality of second one electrodes formed side by side with the plurality of first one electrodes on one surface of the first strip member;
A plurality of first other electrodes formed side by side in the longitudinal direction of the first band member on the other surface of the first band member;
A plurality of second other electrodes formed side by side with the plurality of first other electrodes on the other surface of the first band-shaped member;
The first belt-like member has a thickness and a dielectric constant equal to each other, has an insulating property, is formed in a belt shape in the longitudinal direction of the first belt-like member, the plurality of first other electrodes, and the plurality of the plurality of first belt-like members A second belt member that sandwiches the second other electrode with the first belt member;
The first belt member and the second belt member are wound,
The first one electrode is opposed to two adjacent ones of the plurality of first other electrodes with the first belt-shaped member interposed therebetween, and the plurality of the plurality of first belt-shaped members are sandwiched between the plurality of the first belt-shaped members. Facing two adjacent ones of the first other electrode,
The first other electrode is opposed to two adjacent ones of the plurality of first one electrodes across the first strip member, and the plurality of the first strip electrodes are sandwiched between the plurality of first strip electrodes. Facing two adjacent ones of the first one electrode,
Each electrostatic capacitance in a region where the first one electrode and the first other electrode face each other with the first band member interposed therebetween, and the first one electrode with the second band member interposed therebetween Each capacitance of the region formed facing the first other electrode is equal,
The second one electrode is opposed to two adjacent ones of the plurality of second other electrodes with the first belt-shaped member interposed therebetween, and the plurality of the second belt-shaped members are sandwiched between the plurality of the second belt-shaped members. Opposite two adjacent electrodes of the second other electrode,
The second other electrode is opposed to two adjacent ones of the plurality of second one electrodes with the first strip member interposed therebetween, and the plurality of the second strip electrodes with the second strip member interposed therebetween. Facing two adjacent ones of the second one electrodes,
Each electrostatic capacitance in a region where the second one electrode and the second other electrode face each other with the first band member interposed therebetween, and the second one electrode with the second band member interposed therebetween The filter circuit according to claim 1, wherein each capacitance in a region facing the second other electrode is equal. The plurality of second one electrodes are formed in pairs with the plurality of first one electrodes,
The plurality of second other electrodes are formed in pairs with the plurality of first other electrodes,
Each of the plurality of second one electrodes is connected to one of the plurality of first one electrodes formed in a pair,
4. The filter circuit according to claim 3, wherein each of the plurality of second other electrodes is connected to one of the plurality of first other electrodes formed in a pair.