JPH04267615A - T-type filter - Google Patents
T-type filterInfo
- Publication number
- JPH04267615A JPH04267615A JP5052491A JP5052491A JPH04267615A JP H04267615 A JPH04267615 A JP H04267615A JP 5052491 A JP5052491 A JP 5052491A JP 5052491 A JP5052491 A JP 5052491A JP H04267615 A JPH04267615 A JP H04267615A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic layer
- opening
- electrode
- magnetic
- type filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 239000004020 conductor Substances 0.000 claims abstract description 19
- 238000000605 extraction Methods 0.000 claims description 11
- 238000010030 laminating Methods 0.000 abstract description 8
- 229910000679 solder Inorganic materials 0.000 abstract description 7
- 239000006071 cream Substances 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910017518 Cu Zn Inorganic materials 0.000 description 1
- 229910017752 Cu-Zn Inorganic materials 0.000 description 1
- 229910017943 Cu—Zn Inorganic materials 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Coils Or Transformers For Communication (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Filters And Equalizers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、ノイズフィルタとして
用いられるインダクタとコンデンサから構成されたＴ型
フィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a T-type filter composed of an inductor and a capacitor used as a noise filter.
【０００２】0002
【従来の技術】従来のＴ型フィルタとしては、インダク
タ（Ｌ）とコンデンサ（Ｃ）等を個別部品としてプリン
ト基板上に、回路配線により接続して実装するディスク
リート型があった。しかし、この型のものは、大型にな
り、面実装に不向きであった。また、面実装に向くよう
に、インダクタを構成する電極が形成された磁性体シー
トと、コンデンサを構成する電極が形成された誘電体シ
ートとを積層して圧着し、同時焼成して一体化するＴ型
フィルタが知られている。このＴ型フィルタで高周波信
号を通過させるために、コンデンサを構成する誘電体シ
ートの厚みを薄くし、誘電率を低くしている。2. Description of the Related Art Conventional T-type filters have been of the discrete type, in which an inductor (L), a capacitor (C), etc. are mounted as individual components on a printed circuit board and connected by circuit wiring. However, this type was large and unsuitable for surface mounting. In addition, in order to be suitable for surface mounting, a magnetic sheet on which electrodes forming an inductor are formed and a dielectric sheet on which electrodes forming a capacitor are formed are laminated and crimped, and are simultaneously fired and integrated. T-type filters are known. In order to allow high frequency signals to pass through this T-type filter, the thickness of the dielectric sheet constituting the capacitor is made thinner and the dielectric constant is lowered.
【０００３】0003
【発明が解決しようとする課題】上記の従来のＴ型フィ
ルタは、誘電体シートの厚みを薄くし、これを磁性体シ
ートと積層しているので、誘電体シートの反りや欠け等
が生じやすくて製造が困難で、Ｔ型フィルタの信頼性も
低く、実用範囲も大幅に限定されるという問題点があっ
た。[Problems to be Solved by the Invention] The conventional T-type filter described above has a thin dielectric sheet and is laminated with a magnetic sheet, so the dielectric sheet is prone to warping or chipping. However, the reliability of the T-type filter is low, and its practical range is greatly limited.
【０００４】本発明は、このような問題点に鑑みてなさ
れたものであり、小型であって、製造が容易で信頼性が
高く、所要の周波数特性のものを比較的容易に選定する
ことができるＴ型フィルタを提供することを目的として
いる。The present invention has been made in view of these problems, and it is compact, easy to manufacture, highly reliable, and allows relatively easy selection of the desired frequency characteristics. The purpose is to provide a T-type filter that can
【０００５】[0005]
【課題を解決するための手段】本発明に係るＴ型フィル
タは、開口を有する板状の磁性体シートからなる第１の
磁性体層と、この第１の磁性体層の外表面に形成された
前記開口の両縁からそれぞれ二方向に離れて端縁に延び
た引出し電極と、前記第１の磁性体層に開口を有しない
磁性体シートが積層されて形成された第２の磁性体層と
、前記開口に挿着されたチップコンデンサと、前記開口
を有しない第２の磁性体層の前記開口に対向する面に、
開口とほぼ同じ大きさの開口を横断して形成された分岐
電極と、この分岐電極から分岐して２本の帯状導体線路
により形成されたインダクタと、この帯状導体線路に導
通して端面に露出する引出し電極が形成され、前記第１
の磁性体層の開口に挿着されたチップコンデンサの一方
の電極が前記第１の磁性体層の引出し電極に接続され、
他方の電極が前記分岐電極に接続されてなることを特徴
とする。[Means for Solving the Problems] A T-type filter according to the present invention includes a first magnetic layer made of a plate-shaped magnetic sheet having openings, and a first magnetic layer formed on the outer surface of the first magnetic layer. a second magnetic layer formed by laminating a magnetic sheet having no opening on the first magnetic layer; and a second magnetic layer formed by laminating a magnetic sheet having no opening on the first magnetic layer; and a chip capacitor inserted into the opening, and a surface of a second magnetic layer not having the opening facing the opening,
A branch electrode formed across an opening that is approximately the same size as the opening, an inductor formed by two strip-shaped conductor lines branched from this branch electrode, and an inductor that is electrically connected to the strip-shaped conductor line and exposed on the end surface. A lead electrode is formed, and the first
One electrode of a chip capacitor inserted into the opening of the magnetic layer is connected to the extraction electrode of the first magnetic layer,
It is characterized in that the other electrode is connected to the branch electrode.
【０００６】[0006]
【作用】本発明に係るＴ型フィルタは、上記のように開
口を有する板状の磁性体からなる第１の磁性体層の外表
面に引出し電極が形成されるとともに、開口を有しない
第２の磁性体層の前記開口に対向する面に、開口とほぼ
同じ大きさの開口を横断して分岐電極が形成されている
ので、これらの電極での寄生インダクタンス等の影響に
よる減衰特性のバラツキが少なくなる。また、このＴ型
フィルタの前記チップコンデンサは別工程で製造された
ものを挿着するため、磁性体層に誘電体層を積層して製
造しないから、誘電体シートの反りや欠け等による破壊
がなくなり、製造が容易となり、信頼性も高くなるとと
もに、所要の容量のものを選択でき、磁気シールド効果
も高くなる。また、インダクタも積層により形成するの
で、ターン数や材質を変えることによりインダクタンス
を変更できるので、小型にできる。従って、Ｔ型フィル
タとして、極めて周波数特性のよい信頼性の高い小型な
ものとすることができる。[Function] As described above, the T-type filter according to the present invention has an extraction electrode formed on the outer surface of the first magnetic layer made of a plate-shaped magnetic material having openings, and a second electrode having no openings. Branch electrodes are formed on the surface of the magnetic layer facing the aperture, crossing an aperture of approximately the same size as the aperture, so variations in the attenuation characteristics due to the effects of parasitic inductance etc. in these electrodes are eliminated. It becomes less. In addition, since the chip capacitor of this T-type filter is manufactured in a separate process and is not manufactured by laminating a dielectric layer on a magnetic layer, there is no risk of damage due to warping or chipping of the dielectric sheet. This makes manufacturing easier, increases reliability, allows selection of the required capacity, and improves magnetic shielding effectiveness. Further, since the inductor is also formed by laminating layers, the inductance can be changed by changing the number of turns and the material, so it can be made smaller. Therefore, the T-type filter can be made small and highly reliable with extremely good frequency characteristics.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。図において、１はＴ型フィルタ、２は開口４を有
する第１の磁性体層、３は開口を有しない第２の磁性体
層、５は第１の磁性体層の一つの開口した面に、開口端
縁から端面に延びて形成された引出し電極、６はチップ
コンデンサである。Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. In the figure, 1 is a T-type filter, 2 is a first magnetic layer with an opening 4, 3 is a second magnetic layer without an opening, and 5 is one open surface of the first magnetic layer. , an extraction electrode extending from the edge of the opening to the end surface, and 6 a chip capacitor.
【０００８】第１の磁性体層２は、図３に示すように、
開口４を有する第１の磁性体シート２ａ〜２ｃが積層さ
れて形成される。この第１の磁性体層２の第１の磁性体
シート２ａの外側になる面には、導電性の引出し電極５
が塗布、印刷、メッキ、スパッタリング等により開口４
の両縁からそれぞれ二方向に離れて端縁に延びて形成さ
れている。他方の側の第１の磁性体シート２ｃに接して
開口を有しない第２の磁性体層３が積層されている。第
２の磁性体層３は第１の磁性体と同様に第２の磁性体シ
ート３ａ〜３ｆが積層されて形成される。The first magnetic layer 2 has, as shown in FIG.
First magnetic sheets 2a to 2c having openings 4 are stacked and formed. A conductive extraction electrode 5 is provided on the surface of the first magnetic layer 2 that is outside the first magnetic sheet 2a.
The opening 4 is formed by coating, printing, plating, sputtering, etc.
It is formed so as to extend away from both edges in two directions to the end edge. A second magnetic layer 3 having no openings is laminated in contact with the first magnetic sheet 2c on the other side. The second magnetic layer 3 is formed by laminating second magnetic sheets 3a to 3f similarly to the first magnetic layer.
【０００９】第１の磁性体層２に隣接する第２の磁性体
シート３ａの一面には、分岐電極７と２本のＬ字形の帯
状導体線路８ａ，８ｂと各帯状導体線路８ａ，８ｂのそ
れぞれの端にスルーホール１０ａ，１０ｂとが形成され
ている。分岐電極７は第１の磁性体層２の開口４に対向
して、開口を横断して、ほぼ開口と同じ大きさに形成さ
れている。On one surface of the second magnetic sheet 3a adjacent to the first magnetic layer 2, a branch electrode 7, two L-shaped strip conductor lines 8a, 8b, and each strip conductor line 8a, 8b are provided. Through holes 10a and 10b are formed at each end. The branch electrode 7 is formed to face the opening 4 of the first magnetic layer 2, cross the opening, and have approximately the same size as the opening.
【００１０】帯状導体線路８ａ，８ｂは、インダクタを
形成するように、分岐電極７から点対称状に分岐し、磁
性体シート３ａの端縁に向かって延び、そこから直角に
曲げられて端縁に沿って延ばされ、それぞれの端のスル
ーホール１０ａ，１０ｂにより隣の帯状導体線路に導通
するようにされている。分岐電極７及び帯状導体線路８
ａ，８ｂは、上記引出し電極５と同様に塗布等により形
成される。磁性体シート３ａに隣接する磁性体シート３
ｂには、２本のＬ字形の帯状導体線路９ａ，９ｂと引出
し用電極１１ａ，１１ｂとが形成されている。帯状導体
線路９ａ，９ｂは、それぞれ帯状導体線路８ａ，８ｂと
接続して所望のインダクタンス値のインダクタを形成す
るように延ばされ、その一端はそれぞれスルーホール１
０ａ，１０ｂに対向する場所に位置し、他端はそれぞれ
引出し電極１１ａ，１１ｂに接続されている。帯状導体
線路の形成された磁性体シートを順次積層し、スルーホ
ールを介して帯状導体線路を接続して導通することによ
り巻数を増減させ所望のインダクタンス値のインダクタ
とする。The strip-shaped conductor lines 8a, 8b branch from the branch electrode 7 in a point-symmetric manner so as to form an inductor, extend toward the edge of the magnetic sheet 3a, and are bent at right angles from there to the edge. The strip conductor line is extended along the line, and is electrically connected to the adjacent strip-shaped conductor line through through holes 10a and 10b at each end. Branch electrode 7 and strip conductor line 8
A and 8b are formed by coating or the like in the same manner as the extraction electrode 5 described above. Magnetic sheet 3 adjacent to magnetic sheet 3a
Two L-shaped strip-shaped conductor lines 9a, 9b and extraction electrodes 11a, 11b are formed in b. The strip conductor lines 9a and 9b are extended so as to be connected to the strip conductor lines 8a and 8b, respectively, to form an inductor having a desired inductance value, and one end thereof is connected to the through hole 1, respectively.
0a and 10b, and the other ends are connected to extraction electrodes 11a and 11b, respectively. Magnetic sheets on which band-shaped conductor lines are formed are sequentially laminated, and the number of turns is increased or decreased by connecting and conducting the band-shaped conductor lines through through holes to obtain an inductor with a desired inductance value.
【００１１】上記磁性体シートはフェライト、例えばＭ
ｎ−Ｚｎ系、Ｎｉ−Ｚｎ系、Ｃｕ−Ｚｎ系等の各種の磁
性材粉末のうちの適宜のものから成形する。この成形方
法としては、粉末プレス法、押出法、流し込み法、シー
ト法等が用いられる。そして第１の磁性体シート２ａ〜
２ｃ及び第２の磁性体シート３ａ〜３ｆを作成し、これ
を積層して圧着し、焼成して第４図に示すような一方の
面に開口４を有した直方体のブロック１２を得る。この
直方体のブロック１２の側面に露出した引出し電極１１
ａ，１１ｂにそれぞれ導通させて塗布等により、外部電
極１３ａ，１３ｂを形成する。同様にして引出し電極５
に接続して、外部電極１４ａ，１４ｂも塗布等により形
成する。[0011] The magnetic sheet is made of ferrite, for example M
It is molded from a suitable one of various magnetic material powders such as n-Zn type, Ni-Zn type, Cu-Zn type, etc. As the molding method, a powder press method, an extrusion method, a casting method, a sheet method, etc. are used. And the first magnetic sheet 2a~
2c and second magnetic sheets 3a to 3f are prepared, stacked, pressed, and fired to obtain a rectangular parallelepiped block 12 having an opening 4 on one surface as shown in FIG. Extracting electrode 11 exposed on the side surface of this rectangular parallelepiped block 12
External electrodes 13a and 13b are formed by coating or the like with conduction applied to a and 11b, respectively. Similarly, the extraction electrode 5
External electrodes 14a and 14b are also formed by coating or the like.
【００１２】次いで、図２に示すように、この直方体の
ブロック１２の開口４にチップコンデンサ６を嵌める。
そしてはんだ等により電極を導通させるとともに接着す
ることにより挿着する。このチップコンデンサ６はチッ
プ型とすることにより小型化し、所望の容量のものを選
択する。特に積層チップコンデンサとすることにより、
一層小型化でき、各種の容量のものを選択する余地が広
がる。チップコンデンサ６の一方の外部電極１５ａは直
方体のブロック１２の外部電極５にはんだ、導電性接着
剤等により接続される。一方チップコンデンサ６の他方
の外部電極１５ｂは、直方体ブロック１２の開口４を塞
ぐ面の分岐電極７にはんだ、導電性接着剤等により接続
される。チップコンデンサ６の挿着は、分岐電極７にク
リームはんだをつけ、チップコンデンサ６を嵌め、前記
他方の外部電極１５ｂと接触するようにした後引出し電
極５と外部電極１５ａとをはんだづけする。このように
すると、引出し電極５と外部電極１５ａとのはんだづけ
する熱でクリームはんだがとけて、分岐電極７と外部電
極１５ｂとの導通が確実になる。すると、図６に示すＴ
型等価回路のフィルタとなる。さらに、図５に示すよう
に、開口４のある面を磁粉含有樹脂１６をモールドして
平滑面にし、インダクタのインダクタンスを増加させ、
より小型化を図る。Next, as shown in FIG. 2, a chip capacitor 6 is fitted into the opening 4 of this rectangular parallelepiped block 12. Then, the electrodes are made electrically conductive using solder or the like, and then inserted by adhesion. This chip capacitor 6 can be miniaturized by making it into a chip type, and a capacitor with a desired capacity is selected. In particular, by making it a multilayer chip capacitor,
It can be further miniaturized and there is more room to choose from various capacities. One external electrode 15a of the chip capacitor 6 is connected to the external electrode 5 of the rectangular parallelepiped block 12 by solder, conductive adhesive, or the like. On the other hand, the other external electrode 15b of the chip capacitor 6 is connected to the branch electrode 7 on the surface of the rectangular parallelepiped block 12 that closes the opening 4 by solder, conductive adhesive, or the like. To insert the chip capacitor 6, apply cream solder to the branch electrode 7, fit the chip capacitor 6 into contact with the other external electrode 15b, and then solder the lead electrode 5 and the external electrode 15a. In this way, the cream solder is melted by the heat of soldering the lead electrode 5 and the external electrode 15a, and the conduction between the branch electrode 7 and the external electrode 15b is ensured. Then, T shown in FIG.
It becomes a type equivalent circuit filter. Furthermore, as shown in FIG. 5, the surface with the opening 4 is made smooth by molding magnetic powder-containing resin 16 to increase the inductance of the inductor.
Try to make it more compact.
【００１３】上記のように本発明に係るＴ型フィルタは
、開口を有する第１の磁性体層と、開口を有しない第２
の磁性体層と積層し、開口にチップコンデンサを挿着し
てなるため、信頼性の高いＬＣ部品が得られる。インダ
クタは帯状導体線路のターン数や材質の積層により調整
でき、容量はコンデンサを変えることにより調整できる
ので、小型にできるとともに、多種の周波数特性のもの
を比較的容易に選択でき、各種帯域に適合した高性能ノ
イズ除去能力を有する。As described above, the T-type filter according to the present invention includes a first magnetic layer having an opening and a second magnetic layer having no opening.
Since the chip capacitor is laminated with a magnetic layer and a chip capacitor is inserted into the opening, a highly reliable LC component can be obtained. The inductor can be adjusted by changing the number of turns in the strip-shaped conductor line and the lamination of materials, and the capacitance can be adjusted by changing the capacitor, so it can be made smaller, and it is relatively easy to select one with a variety of frequency characteristics, making it suitable for various bands. It has high-performance noise removal ability.
【００１４】[0014]
【発明の効果】本発明に係るＴ型フィルタは、磁性体層
を積層してインダクタを形成するので、製造の際の反り
や、磁性体シートの破壊が少なくでき、インダクタ部分
を小型にでき、しかもインダクタンスの調整も比較的容
易にでき、コンデンサについても種々のチップコンデン
サと組合わせが可能であり、小型で多種の周波数特性の
ものを比較的容易に得ることができて回路定数を比較的
広範囲にできるとともに、信頼性の高い高性能ノイズ除
去能力を有した面実装タイプのものとなる。[Effects of the Invention] Since the T-type filter according to the present invention forms an inductor by laminating magnetic layers, warping during manufacturing and destruction of the magnetic sheet can be reduced, and the inductor portion can be made smaller. Moreover, it is relatively easy to adjust the inductance, and the capacitor can be combined with various chip capacitors, making it relatively easy to obtain small size and various frequency characteristics, and allowing a relatively wide range of circuit constants. It is a surface-mount type device that can be used to remove noise, and has highly reliable and high-performance noise removal capabilities.
【００１５】[0015]
【図１】本発明に係るＴ型フィルタの斜視図である。FIG. 1 is a perspective view of a T-type filter according to the present invention.
【図２】本発明に係るＴ型フィルタの組立て工程の一部
を説明する斜視図である。FIG. 2 is a perspective view illustrating a part of the assembly process of the T-type filter according to the present invention.
【図３】本発明に係るＴ型フィルタの一部の構成を説明
する分解斜視図である。FIG. 3 is an exploded perspective view illustrating the configuration of a part of the T-type filter according to the present invention.
【図４】図３のＴ型フィルタの一部の構成を積層し、圧
着し、焼成して得たブロック体の斜視図である。4 is a perspective view of a block obtained by laminating, pressing, and firing a part of the T-type filter shown in FIG. 3; FIG.
【図５】本発明に係るＴ型フィルタの一実施例の一部断
面図である。FIG. 5 is a partial cross-sectional view of an embodiment of a T-type filter according to the present invention.
【図６】Ｔ型フィルタの等価回路図である。FIG. 6 is an equivalent circuit diagram of a T-type filter.
１ Ｔ型フィルタ。 ２ 第１の磁性体層。 ２ａ〜２ｃ 第１の磁性体シート。 ３ 第２の磁性体層。 ３ａ〜３ｆ 第２の磁性体シート。 ４ 開口。 ６ チップコンデンサ。 1 T-type filter. 2 First magnetic layer. 2a-2c First magnetic sheet. 3 Second magnetic layer. 3a-3f Second magnetic sheet. 4. Opening. 6 Chip capacitor.
Claims (1)
なる第１の磁性体層と、この第１の磁性体層の外表面に
形成された前記開口の両縁からそれぞれ二方向に離れて
端縁に延びた引出し電極と、前記第１の磁性体層に開口
を有しない磁性体シートが積層されて形成された第２の
磁性体層と、前記開口に挿着されたチップコンデンサと
、前記開口を有しない第２の磁性体層の前記開口に対向
する面に、開口とほぼ同じ大きさの開口を横断して形成
された分岐電極と、この分岐電極から分岐して２本の帯
状導体線路により形成されたインダクタとからなり、前
記帯状導体線路に導通して端面に露出する引出し電極が
形成され、前記第１の磁性体層の開口に挿着されたチッ
プコンデンサの一方の電極が前記第１の磁性体層の引出
し電極に接続され、他方の電極が前記分岐電極に接続さ
れてなることを特徴とするＴ型フィルタ。Claims: 1. A first magnetic layer made of a plate-shaped magnetic sheet having an opening; and a first magnetic layer formed on the outer surface of the first magnetic layer, the first magnetic layer having a first magnetic layer formed on the outer surface of the first magnetic layer, the first magnetic layer having a first magnetic layer formed on the outer surface of the first magnetic layer, and the first magnetic layer having a first magnetic layer having an opening formed on the outer surface of the first magnetic layer. an extraction electrode extending to an edge, a second magnetic layer formed by stacking magnetic sheets having no openings on the first magnetic layer, and a chip capacitor inserted in the opening; A branch electrode formed across an opening of approximately the same size as the opening on the surface of the second magnetic layer having no opening facing the opening, and two strip-shaped strips branching from the branch electrode. an inductor formed by a conductor line, an extraction electrode that is electrically connected to the strip-shaped conductor line and exposed at the end surface, and one electrode of a chip capacitor inserted into the opening of the first magnetic layer. A T-type filter, characterized in that the first magnetic layer is connected to an extraction electrode, and the other electrode is connected to the branch electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5052491A JPH04267615A (en) | 1991-02-21 | 1991-02-21 | T-type filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5052491A JPH04267615A (en) | 1991-02-21 | 1991-02-21 | T-type filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04267615A true JPH04267615A (en) | 1992-09-24 |
Family
ID=12861376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5052491A Pending JPH04267615A (en) | 1991-02-21 | 1991-02-21 | T-type filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04267615A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06125236A (en) * | 1992-10-12 | 1994-05-06 | Matsushita Electric Ind Co Ltd | Lc filter |
| US5838214A (en) * | 1996-07-08 | 1998-11-17 | Motorola, Inc. | Unitary packaging system for a capacitor and inductor |
| WO2014115434A1 (en) * | 2013-01-22 | 2014-07-31 | 株式会社村田製作所 | Lc composite component |
-
1991
- 1991-02-21 JP JP5052491A patent/JPH04267615A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06125236A (en) * | 1992-10-12 | 1994-05-06 | Matsushita Electric Ind Co Ltd | Lc filter |
| US5838214A (en) * | 1996-07-08 | 1998-11-17 | Motorola, Inc. | Unitary packaging system for a capacitor and inductor |
| WO2014115434A1 (en) * | 2013-01-22 | 2014-07-31 | 株式会社村田製作所 | Lc composite component |
| US9577597B2 (en) | 2013-01-22 | 2017-02-21 | Murata Manufacturing Co., Ltd. | LC composite component |
| US9960746B2 (en) | 2013-01-22 | 2018-05-01 | Murata Manufacturing Co., Ltd. | LC composite component |
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