JPS628583Y2 - - Google Patents

Description

【考案の詳細な説明】 本考案はラジオ、トランシーバを初め各種無線
機器の中間周波数増幅回路に使用されるラダー型
セラミツクフイルタの構造に関するものである。[Detailed Description of the Invention] The present invention relates to the structure of a ladder type ceramic filter used in intermediate frequency amplification circuits of various radio equipment such as radios and transceivers.

一般にラダー型セラミツクフイルタは複数個の
圧電共振子を直列、並列に組合せてバンドパス特
性を得るものである。 Generally, a ladder type ceramic filter obtains bandpass characteristics by combining a plurality of piezoelectric resonators in series or parallel.

第１図は従来の２素子構成ラダー型セラミツク
フイルタの構造を示す断面図で直列共振子１およ
び並列共振子２が第２図に示す回路を構成してい
る。第１図に示したように従来の２素子構成ラダ
ー型セラミツクフイルタにおいては入力端子４、
アース端子５、および出力端子６が補助端子７と
ともに直列共振子１、並列共振子２と重ね合わせ
れて構成されるため各端子は個別に作られなけれ
ばならず。このため部品費用が高くなるうえに組
立に時間がかかるという欠点を有した。 FIG. 1 is a sectional view showing the structure of a conventional two-element ladder type ceramic filter, in which a series resonator 1 and a parallel resonator 2 constitute the circuit shown in FIG. As shown in Fig. 1, in the conventional two-element ladder type ceramic filter, the input terminal 4,
Since the ground terminal 5 and the output terminal 6 are constructed by stacking the series resonator 1 and the parallel resonator 2 together with the auxiliary terminal 7, each terminal must be made individually. This has the drawbacks of high component costs and time-consuming assembly.

本考案は、この欠点を除去し、小型で組立容易
な２素子構成ラダー型セラミツクフイルタを提供
せんとするものである。以下本考案を図面につい
て説明する。 The present invention aims to eliminate this drawback and provide a two-element ladder type ceramic filter that is small and easy to assemble. The present invention will be explained below with reference to the drawings.

第３図は本考案の２素子構成ラダー型セラミツ
クフイルタの一実施例を示す正面図で第４図は第
３図のＡ−A′線に沿う断面図である。直列共振
子１および並列共振子２は電極面と平行に平面的
に並んでおり導電体３が各共振子の１方の面側に
配されて直列共振子１および並列共振子各々の電
極面の幾何学的中心近傍で共振子電極と接触して
おり、直列共振子１および並列共振子２の導電体
３と接触している電極面と反対の電極面の幾何学
的中心近傍にそれぞれ入力端子４およびアース端
子５を当接させている。なお出力端子６は導電体
３と電気的に接続されている。 FIG. 3 is a front view showing an embodiment of the two-element ladder type ceramic filter of the present invention, and FIG. 4 is a sectional view taken along line A--A' in FIG. The series resonators 1 and the parallel resonators 2 are arranged in a plane parallel to the electrode surfaces, and the conductor 3 is arranged on one surface side of each resonator to connect the electrode surfaces of the series resonators 1 and the parallel resonators. is in contact with the resonator electrode near the geometric center, and is input near the geometric center of the electrode surface opposite to the electrode surface that is in contact with the conductor 3 of the series resonator 1 and the parallel resonator 2. The terminal 4 and the ground terminal 5 are brought into contact with each other. Note that the output terminal 6 is electrically connected to the conductor 3.

導電体３は金属板あるいは導電ゴム等の導電性
を有する合成樹脂で作られており各共振子との当
接部は逆Ｖ字状あるいは微小突起加工が施され支
持により振動に与える影響を極力滅殺するように
している。また入力端子４およびアース端子５の
共振子電極との当接部にも導電体３と同様の加工
が施されている。 The conductor 3 is made of a metal plate or a conductive synthetic resin such as conductive rubber, and the contact part with each resonator is shaped like an inverted V or has micro protrusions to minimize the influence on vibration by supporting it. I'm trying to annihilate it. Furthermore, the contact portions of the input terminal 4 and the ground terminal 5 with the resonator electrodes are also processed in the same manner as the conductor 3.

入力端子４、アース端子５、および出力端子６
は同一面状に構成されるため１枚の平坦な金属板
からリードフレーム状に形成することができる。 Input terminal 4, ground terminal 5, and output terminal 6
Since they are constructed in the same plane, they can be formed into a lead frame shape from a single flat metal plate.

第５図は本考案のセラミツクフイルタの一実施
例の組立方法の説明図である。先ずモールドケー
ス８内に入力端子４、アース端子５および出力端
子６が１体に形成された端子板９をセツトし、次
にケース８に形成された共振子保持用の凹部１
０，１０′に直列共振子１および並列共振子２を
セツトする。さらにその上に導電体３をセツト
し、ケース８に蓋板１１をかぶせた後樹脂注入等
により各共振子部分に振動に影響を与えぬよう空
間を保つた状態で密封する。最後に各端子を破線
Ｂ−B′に沿つて切断することによりフイルタは完
成する。 FIG. 5 is an explanatory diagram of a method of assembling an embodiment of the ceramic filter of the present invention. First, the terminal plate 9, in which the input terminal 4, the ground terminal 5, and the output terminal 6 are integrally formed, is set in the molded case 8, and then the resonator holding recess 1 formed in the case 8 is set.
A series resonator 1 and a parallel resonator 2 are set at 0 and 10'. Further, the conductor 3 is set thereon, and the case 8 is covered with the cover plate 11, and then sealed by resin injection or the like to maintain a space in each resonator portion so as not to affect the vibration. Finally, the filter is completed by cutting each terminal along the broken line B-B'.

上記実施例として直列、並列共振子を共に長方
形板の長さ振動を利用した圧電振動子を用いた
が、並列共振子を正方形板域は円板の周辺振動を
利用した圧電振動子としてもよい。 In the above embodiment, both the series and parallel resonators are piezoelectric vibrators that utilize the length vibration of a rectangular plate, but the parallel resonator may be a piezoelectric vibrator that utilizes the peripheral vibration of a circular plate for the square plate region. .

以上示したように本考案によれば端子が１体に
形成されるため部品代が安くなるとともに加工組
立も大幅に簡略化される。 As described above, according to the present invention, the terminal is formed in one piece, which reduces the cost of parts and greatly simplifies processing and assembly.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の２素子構成ラダー型セラミツク
フイルタの構成を示す断面図、第２図は２素子構
成ラダー型セラミツクフイルタの回路図、第３図
は本考案による２素子構成ラダー型セラミツクフ
イルタの内部構造を示す正面図、第４図は第３図
のＡ−A′断面図、第５図は本考案の２素子構成
ラダー型セラミツクフイルタの組立説明図。 １……直列共振子、２……並列共振子、３……
導電体、４……入力端子、５……アース端子、６
……出力端子、７……補助端子、８……絶縁ケー
ス、９……端子板、１０，１０′……ケースにセ
ラミツクフイルタを収納するために設けられた凹
部、１１……蓋板。 Figure 1 is a sectional view showing the configuration of a conventional two-element ladder type ceramic filter, Figure 2 is a circuit diagram of a two-element ladder type ceramic filter, and Figure 3 is a two-element ladder type ceramic filter according to the present invention. FIG. 4 is a front view showing the internal structure, FIG. 4 is a sectional view taken along line A-A' in FIG. 3, and FIG. 5 is an explanatory diagram for assembling the two-element ladder type ceramic filter of the present invention. 1...Series resonator, 2...Parallel resonator, 3...
Conductor, 4... Input terminal, 5... Earth terminal, 6
. . . Output terminal, 7 .

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 矩形板圧電振動子の長さ方向の振動を利用した
直列共振子１および並列共振子２を各々の電極面
を平行に且つ平面的配設し、金属板または導電性
ゴムよりなる導電体３を直列共振子１および並列
共振子２の１方の面側に配設し直列共振子１およ
び並列共振子２の各電極面の幾何学的中心近傍で
共振子電極と接触せしめ、且つ直列共振子１およ
び並列共振子２の導電体３と接触している電極面
と反対の電極面の幾何学的中心近傍にそれぞれ入
力端子４およびアース端子５を当接し、導電体３
と出力端子６を電気的に接続させたラダー型セラ
ミツクフイルタ。 A series resonator 1 and a parallel resonator 2 that utilize vibration in the longitudinal direction of a rectangular plate piezoelectric vibrator are arranged in a plane with their electrode surfaces parallel to each other, and a conductor 3 made of a metal plate or conductive rubber is arranged. The series resonator 1 is arranged on one side of the series resonator 1 and the parallel resonator 2, and is brought into contact with the resonator electrode near the geometric center of each electrode surface of the series resonator 1 and the parallel resonator 2, and the series resonator The input terminal 4 and the ground terminal 5 are brought into contact with the vicinity of the geometrical center of the electrode surface opposite to the electrode surface in contact with the conductor 3 of the parallel resonator 1 and the parallel resonator 2, respectively.
A ladder type ceramic filter in which the output terminal 6 and the output terminal 6 are electrically connected.