JPH0448002B2 - - Google Patents
Info
- Publication number
- JPH0448002B2 JPH0448002B2 JP60091068A JP9106885A JPH0448002B2 JP H0448002 B2 JPH0448002 B2 JP H0448002B2 JP 60091068 A JP60091068 A JP 60091068A JP 9106885 A JP9106885 A JP 9106885A JP H0448002 B2 JPH0448002 B2 JP H0448002B2
- Authority
- JP
- Japan
- Prior art keywords
- absorbing material
- sound absorbing
- sound
- delay line
- medium
- 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.)
- Expired - Lifetime
Links
- 239000011358 absorbing material Substances 0.000 claims description 22
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000000644 propagated effect Effects 0.000 claims 1
- 230000001902 propagating effect Effects 0.000 description 10
- 230000002238 attenuated effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000003822 epoxy resin Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 2
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- -1 gold or silver Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電気信号を音波に変換し遅延媒体中
を伝播させることにより該電気信号を遅延せしめ
る超音波遅延線に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ultrasonic delay line that delays electrical signals by converting them into sound waves and propagating them through a delay medium.
上述の超音波遅延線がTV受像機やビデオテー
プレコーダ（VTR）やビデオカメラ等の回路中
に広く用いられている。
The above-described ultrasonic delay line is widely used in circuits of TV receivers, video tape recorders (VTRs), video cameras, and the like.
この様な超音波遅延線においては、遅延媒体中
を伝播する音波の所望の通路以外にも音波が伝播
するために、この所望通路以外の音波が出力トラ
ンスデユーサで検出され所謂スプリアスノイズと
なり、VTR等の再生画面上に悪影響を与える虞
れがある。このため、遅延媒体の音波の伝播方向
に並行な主表面上や該主表面に垂直な側面上に前
記所望通路以外の音波を吸収する吸音材を設けた
り、前記主表面や側面を粗面化して所望通路外の
音波を減衰させる方法が知られている。 In such an ultrasonic delay line, since the sound waves propagate in paths other than the desired path in the delay medium, the sound waves in paths other than the desired path are detected by the output transducer and become so-called spurious noise. There is a risk of adversely affecting the playback screen of a VTR, etc. For this reason, a sound absorbing material that absorbs sound waves other than the desired path is provided on the main surface of the delay medium parallel to the propagation direction of the sound waves or on the side surfaces perpendicular to the main surface, or the main surface and side surfaces are roughened. There are known methods of attenuating sound waves outside the desired path.
また、所望通路内を伝播する音波でも、いつた
ん出力側トランスデユーサに検出された後再び所
望通路内を伝播して入力トランスデユーサに戻つ
てくる所望遅延時間τの２倍の遅延時間を有する
2τスプリアスノイズや、該2τスプリアスノイズが
再び所望通路を経て出力トランスデユーサで検出
される3τスプリアスノイズが存在し、該2τ，3τス
プリアスノイズを除去するため、本出願人自身の
出願になる特公昭52−19942号公報開示の如く、
所望通路内に吸音材を設けて2τ，3τスプリアスノ
イズを減衰させる方法も知られている。 In addition, even when a sound wave propagates in a desired path, once it is detected by the output transducer, it propagates again in the desired path and returns to the input transducer for a delay time that is twice the desired delay time τ. have
There are 2τ spurious noises and 3τ spurious noises that are detected by the output transducer after the 2τ spurious noises pass through a desired path again, and in order to remove the 2τ and 3τ spurious noises, the present applicant's own patent application is proposed. As disclosed in Publication No. 52-19942,
A method of attenuating 2τ and 3τ spurious noise by providing a sound absorbing material within a desired passage is also known.
上述した従来のスプリアスノイズの減衰方法で
は、遅延媒体中を伝播する音波の基本周波数成分
（以後「主信号」と称する）の除去のみに考慮が
払われていた。即ち、所望通路以外の経路をたど
るスプリアスノイズの基本周波数成分と所望通路
を経由する2τ，3τスプリアスノイズの基本周波数
成分の除去のみの対策がなされていたのである。
In the conventional spurious noise attenuation method described above, consideration was given only to the removal of the fundamental frequency component (hereinafter referred to as "main signal") of the sound wave propagating in the delay medium. That is, measures have been taken to only remove the fundamental frequency components of spurious noise that follows a path other than the desired path and the fundamental frequency components of 2τ and 3τ spurious noise that travel through the desired path.
しかるに、一般に、遅延媒体中を伝播する音波
信号は高調波成分を有し、例えば第２図の周波数
特性図に示すように、主信号通過帯域の中心周波
数f0（図の例では4.3MHz）の３ないし４倍の周波
数f3（図の例では13ないし16MHz）を有する第３
次高調波成分のスプリアスノイズが重畳してい
る。この様な高調波成分のスプリアスノイズがか
なりのレベル（第２図の例では主信号レベル−
20dBのレベル）で主信号に重畳している場合に
は、例えばビデオカメラでは、再生画像上に縞状
ノイズが発生する等の良好な画像再生を損う原因
となつてしまう。 However, in general, a sound wave signal propagating in a delay medium has harmonic components, and for example, as shown in the frequency characteristic diagram of Fig. 2, the center frequency of the main signal passband f 0 (4.3MHz in the example shown) 3 to 4 times the frequency f 3 (13 to 16 MHz in the example shown).
Spurious noise of harmonic components is superimposed. The spurious noise of such harmonic components is at a considerable level (in the example in Figure 2, the main signal level is -
If the signal is superimposed on the main signal at a level of 20 dB, for example, in a video camera, it may cause striped noise on the reproduced image, impairing good image reproduction.
本発明は従来の超音波遅延線のこの様な欠点を
解消するためになされたものであり、第３次高調
波成分以上の高調波スプリアスノイズの無い超音
波遅延素子を提供することを目的とする。 The present invention was made in order to eliminate such drawbacks of conventional ultrasonic delay lines, and an object of the present invention is to provide an ultrasonic delay element that is free from harmonic spurious noises higher than the third harmonic component. do.
本発明の超音波遅延線は、入力電圧に応じて音
波を発生する入力トランスデユーサと、該入力ト
ランスデユーサにより発生された音波を伝播する
遅延媒体と、該遅延媒体中を伝播した音波により
出力電圧を発生する出力トランスデユーサとを備
えた超音波遅延線において、前記遅延媒体の表面
の少くとも一部に該遅延媒体中を伝播する音波の
うち主信号通過帯域はほとんど減衰させず、第３
次高調波成分以上の音波を主として吸収するよう
に、50Åないし5μmの厚みの吸音材を設けて成る
ことを特徴とするものである。
The ultrasonic delay line of the present invention includes an input transducer that generates a sound wave according to an input voltage, a delay medium that propagates the sound wave generated by the input transducer, and a In an ultrasonic delay line comprising an output transducer that generates an output voltage, at least a part of the surface of the delay medium hardly attenuates the main signal passband of the sound wave propagating in the delay medium, Third
It is characterized by being provided with a sound absorbing material having a thickness of 50 Å to 5 μm so as to mainly absorb sound waves of harmonic components or higher.
以下図面を参照しながら本発明の代表的例につ
き説明する。 Representative examples of the present invention will be described below with reference to the drawings.
第１図は本発明になる超音波遅延線の代表的一
例を示す側面図である。図において、入力トラン
スデユーサ１から遅延媒体２中へ放射された音波
３は、主信号に対する図示しない吸音材により所
望通路４を画され出力トランスデユーサ５へ導か
れる。 FIG. 1 is a side view showing a typical example of an ultrasonic delay line according to the present invention. In the figure, a sound wave 3 emitted from an input transducer 1 into a delay medium 2 is guided to an output transducer 5 through a desired path 4 defined by a sound absorbing material (not shown) for the main signal.
本例においては、遅延媒体２の主表面２ａにエ
ポキシ樹脂製の吸音材６を印刷法等により形成し
第３次高調波成分以上の音波を吸収せしめる。 In this example, a sound absorbing material 6 made of epoxy resin is formed on the main surface 2a of the delay medium 2 by a printing method or the like to absorb sound waves higher than the third harmonic component.
吸音材６は、第１図に示す様に、主表面２ａの
音波３の所望通路４上に設けても良く、主表面２
ａの全表面に設けても良く、第３図に示す様に、
側面上に設けても良い。即ち音波３の所望通路４
にあたる遅延媒体２の主表面２ａ又は側面の少く
とも一部上に形成すれば良い。 The sound absorbing material 6 may be provided on the desired path 4 of the sound wave 3 on the main surface 2a, as shown in FIG.
It may be provided on the entire surface of a, as shown in Figure 3.
It may also be provided on the side. That is, the desired path 4 of the sound wave 3
It may be formed on at least a part of the main surface 2a or side surface of the delay medium 2.
吸音材６は上述のエポキシ樹脂やシリコン樹脂
等の音波を吸収する弾性樹脂の他、金や銀等の金
属やSiO2等の酸化物等音波を吸収し得るもので
あれば何でも良い。 The sound absorbing material 6 may be any material that can absorb sound waves, such as an elastic resin that absorbs sound waves, such as the above-mentioned epoxy resin or silicone resin, or metals such as gold or silver, or oxides such as SiO 2 .
吸音材６として弾性樹脂を用いる場合には、前
述したスクリーン印刷法の他、弾性樹脂を溶媒に
溶融して液状としてその中に遅延媒体２を浸漬し
て形成しても良く、又、固体状の弾性樹脂を接着
剤で遅延媒体２の表面上に貼着しても良い。 When using an elastic resin as the sound absorbing material 6, in addition to the above-mentioned screen printing method, the elastic resin may be melted in a solvent to form a liquid and the delay medium 2 may be immersed therein. The elastic resin may be adhered onto the surface of the delay medium 2 with an adhesive.
吸音材６として金属や酸化物を用いる場合に
は、蒸着法やスパツタ法等で形成すれば良い。 When using metal or oxide as the sound absorbing material 6, it may be formed by a vapor deposition method, a sputtering method, or the like.
吸音材６としてどの様な材料を用いどの様な方
法で形成するにせよ、その厚さは、遅延媒体２中
を伝播する主信号はほとんど減衰させず、第３次
高調波成分以上のスプリアスノイズを主として減
衰させる厚さでなければならない。このために
は、吸音材６として弾性樹脂を用いる場合には
500Åないし0.05mm厚であり、金属あるいは酸化
物を用いる場合には50Åないし5μm厚であること
が望ましい。 No matter what kind of material is used and how it is formed as the sound absorbing material 6, its thickness is such that it hardly attenuates the main signal propagating in the delay medium 2 and suppresses spurious noise of the third harmonic component or higher. The thickness must be such that it primarily attenuates. For this purpose, when using elastic resin as the sound absorbing material 6,
The thickness is 500 Å to 0.05 mm, and when metal or oxide is used, the thickness is preferably 50 Å to 5 μm.
入出力トランスデユーサ１，５としては、チタ
ン酸ジルコン酸鉛、水晶、リチウムニオベイト等
の圧電素子が用いられ、遅延媒体２の側面上に接
着剤による接着法や半田付け等の方法により固着
される。 As the input/output transducers 1 and 5, piezoelectric elements such as lead zirconate titanate, crystal, lithium niobate, etc. are used, and are fixed on the side surface of the delay medium 2 by adhesive bonding, soldering, etc. be done.
遅延媒体２としては、等方性ガラス、セラミツ
クス、金属等の音波を伝播し得る材質のものが用
いられる。 The delay medium 2 is made of a material capable of propagating sound waves, such as isotropic glass, ceramics, or metal.
遅延媒体２中を伝播する音波３は、所望通路４
以外の方向に伝播する音波は主信号を減衰させる
不図示の吸音材により減衰させられてしまうた
め、所望通路４を経由して出力トランスデユーサ
５へ到達する。
The sound wave 3 propagating through the delay medium 2 is guided through a desired path 4
Since sound waves propagating in other directions are attenuated by a sound absorbing material (not shown) that attenuates the main signal, they reach the output transducer 5 via the desired path 4.
この所望通路４にあたる遅延媒体２の表面の少
くとも一部には吸音材６が形成されているため、
該所望通路４を通る音波３は、その第３次高調波
以上の成分が該吸音材６に吸収されて減衰し、第
４図に示すように、第３次高調波以上のスプリア
スノイズ成分が減衰した周波数特性となる。即ち
吸音材６の材質と厚さを調整することにより、所
望通路４を伝播する音波３の主信号はほとんど減
衰させることなく、第３次高調波以上のスプリア
スノイズ成分を減衰せしめるのである。 Since the sound absorbing material 6 is formed on at least a part of the surface of the delay medium 2 corresponding to the desired passage 4,
In the sound wave 3 passing through the desired path 4, components of the third harmonic or higher are absorbed and attenuated by the sound absorbing material 6, and as shown in FIG. 4, spurious noise components of the third harmonic or higher are attenuated. This results in attenuated frequency characteristics. That is, by adjusting the material and thickness of the sound absorbing material 6, the main signal of the sound wave 3 propagating through the desired path 4 is hardly attenuated, while the spurious noise components of the third harmonic or higher are attenuated.
ガラス製遅延媒体の一側面に、第１図に示す様
に、チタン酸ジルコン酸鉛片を２片接着剤で貼着
し、それぞれ入力トランスデユーサと出力トラン
スデユーサとした。
As shown in FIG. 1, two pieces of lead zirconate titanate were adhered to one side of the glass delay medium with adhesive to form an input transducer and an output transducer, respectively.
この遅延媒体の主表面上の所望通路の一部に、
第１図に示す様に、エポキシ樹脂をスクリーン印
刷法で厚さ1000Åに形成した。なお、同じエポキ
シ樹脂を主表面上の所望通路内の一部分に厚さ
0.2mmに形成し主信号通過帯域のスプリアス分を
除去せしめるようにした。 In a portion of the desired path on the major surface of this retardation medium,
As shown in FIG. 1, epoxy resin was formed to a thickness of 1000 Å by screen printing. In addition, apply the same epoxy resin to a certain thickness within the desired passage on the main surface.
The diameter is 0.2 mm to remove spurious components in the main signal passband.
この超音波遅延線に主信号の中心周波数が
4.3MHzの電気信号を入力させた所、第４図に示
すように、第３次高調波の信号レベルは主信号の
信号レベルよりも40dB以上小さい、極めて良好
な周波数特性を示す出力信号が得られた。 The center frequency of the main signal is in this ultrasonic delay line.
When a 4.3MHz electrical signal was input, an output signal with extremely good frequency characteristics was obtained, with the signal level of the third harmonic being more than 40dB lower than the signal level of the main signal, as shown in Figure 4. It was done.
本発明になる超音波遅延線においては、遅延媒
体の表面の少くとも一部に該遅延媒体中を伝播す
る音波のうち主信号通過帯域はほとんど減衰させ
ず、第３次高調波成分以上の音波を主として吸収
するように、50Åないし5μmの厚みの吸音材を設
けたので、主信号成分をほとんど減衰させること
なく第３次高調波以上のスプリアス成分のみを大
幅に減衰させることが出来、ビデオカメラなどに
用いた場合に縞状ノイズ等が発生することなく、
極めて好適な再生画像が得られる。
In the ultrasonic delay line according to the present invention, at least a part of the surface of the delay medium hardly attenuates the main signal passband of the sound waves propagating in the delay medium, and the sound waves of the third harmonic component or higher are Since we provided a sound absorbing material with a thickness of 50 Å to 5 μm to mainly absorb the No striped noise occurs when used in applications such as
An extremely suitable reproduced image can be obtained.
第１図は本発明の超音波遅延線の代表的一例を
示す側面図、第２図は従来の超音波遅延線の周波
数特性を示すグラフ、第３図は本発明の超音波遅
延線の他の例を示す斜視図、第４図は本発明の超
音波遅延線の周波数特性の一例を示すグラフであ
る。
１……入力トランスデユーサ、２……遅延媒
体、３……音波、４……所望通路、５……出力ト
ランスデユーサ、６……吸音材。
Fig. 1 is a side view showing a typical example of the ultrasonic delay line of the present invention, Fig. 2 is a graph showing the frequency characteristics of the conventional ultrasonic delay line, and Fig. 3 is a graph showing other ultrasonic delay lines of the present invention. FIG. 4 is a graph showing an example of the frequency characteristics of the ultrasonic delay line of the present invention. DESCRIPTION OF SYMBOLS 1... Input transducer, 2... Delay medium, 3... Sound wave, 4... Desired path, 5... Output transducer, 6... Sound absorbing material.
Claims (1)
スデユーサと、該入力トランスデユーサにより発
生された音波を伝播する遅延媒体と、該遅延媒体
中を伝播した音波により出力電圧を発生する出力
トランスデユーサとを備えた超音波遅延線におい
て、前記遅延媒体の表面の少くとも一部に該遅延
媒体中を伝播する音波のうち主信号通過帯域はほ
とんど減衰させず、第３次高調波成分以上の音波
を主として吸収するように、50Åないし5μmの厚
みの吸音材を設けて成ることを特徴とする超音波
遅延線。 ２ 吸音材は遅延媒体の主表面に設けられた特許
請求の範囲第１項記載の超音波遅延線。 ３ 吸音材は遅延媒体の側面に設けられた特許請
求の範囲第１項記載の超音波遅延線。 ４ 吸音材は弾性樹脂で、その厚みが500Åない
し5μmである特許請求の範囲第１項ないし第３項
のいずれか１項記載の超音波遅延線。 ５ 吸音材は金属膜である特許請求の範囲第１項
ないし第３項のいずれか１項記載の超音波遅延
線。[Scope of Claims] 1. An input transducer that generates a sound wave according to an input voltage, a delay medium that propagates the sound wave generated by the input transducer, and an output voltage caused by the sound wave propagated in the delay medium. In an ultrasonic delay line comprising an output transducer that generates a An ultrasonic delay line characterized by comprising a sound absorbing material having a thickness of 50 Å to 5 μm so as to mainly absorb sound waves of harmonic components or higher. 2. The ultrasonic delay line according to claim 1, wherein the sound absorbing material is provided on the main surface of the delay medium. 3. The ultrasonic delay line according to claim 1, wherein the sound absorbing material is provided on the side surface of the delay medium. 4. The ultrasonic delay line according to any one of claims 1 to 3, wherein the sound absorbing material is an elastic resin and has a thickness of 500 Å to 5 μm. 5. The ultrasonic delay line according to any one of claims 1 to 3, wherein the sound absorbing material is a metal film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9106885A JPS61251310A (en) | 1985-04-30 | 1985-04-30 | Ultrasonic wave delay line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9106885A JPS61251310A (en) | 1985-04-30 | 1985-04-30 | Ultrasonic wave delay line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61251310A JPS61251310A (en) | 1986-11-08 |
| JPH0448002B2 true JPH0448002B2 (en) | 1992-08-05 |
Family
ID=14016182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9106885A Granted JPS61251310A (en) | 1985-04-30 | 1985-04-30 | Ultrasonic wave delay line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61251310A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4548088B2 (en) * | 2004-10-20 | 2010-09-22 | セイコーエプソン株式会社 | Surface acoustic wave device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5081451A (en) * | 1973-11-20 | 1975-07-02 | ||
| JPS54119865A (en) * | 1978-03-09 | 1979-09-18 | Matsushita Electric Ind Co Ltd | Ultrasonic wave delay line of piezoelectric type and its manufacture |
| JPS5826222B2 (en) * | 1982-03-15 | 1983-06-01 | 株式会社日立製作所 | FM/multiplex demodulation circuit |
| JPS58161519A (en) * | 1982-03-19 | 1983-09-26 | Matsushita Electric Ind Co Ltd | Ultrasonic delay line |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4967533U (en) * | 1972-09-26 | 1974-06-12 | ||
| JPS57200926U (en) * | 1981-06-18 | 1982-12-21 | ||
| JPS5826222U (en) * | 1981-08-14 | 1983-02-19 | 昭和電線電纜株式会社 | ultrasonic solid state delay line |
-
1985
- 1985-04-30 JP JP9106885A patent/JPS61251310A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5081451A (en) * | 1973-11-20 | 1975-07-02 | ||
| JPS54119865A (en) * | 1978-03-09 | 1979-09-18 | Matsushita Electric Ind Co Ltd | Ultrasonic wave delay line of piezoelectric type and its manufacture |
| JPS5826222B2 (en) * | 1982-03-15 | 1983-06-01 | 株式会社日立製作所 | FM/multiplex demodulation circuit |
| JPS58161519A (en) * | 1982-03-19 | 1983-09-26 | Matsushita Electric Ind Co Ltd | Ultrasonic delay line |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61251310A (en) | 1986-11-08 |
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