JP2010004388A - 圧電振動子及び感知センサ - Google Patents
圧電振動子及び感知センサ Download PDFInfo
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Abstract
【解決手段】圧電振動子1は、第1の発振周波数を取り出すために圧電片100に設けられた第1の振動領域105と、第2の発振周波数を取り出すために、弾性的な境界領域107を介して第1の振動領域106とは異なる領域105に設けられた第2の振動領域と、を有し、これらの各振動領域105、106に、前記圧電片100を挟んで一面側と他面側とに設けられた励振電極101〜103を備えており、第1の発振周波数と第2の発振周波数との周波数差は、これらの発振周波数の0.2%以上、2.2%以下である
【選択図】図6
Description
第1の発振周波数と第2の発振周波数との周波数差が、これらの発振周波数の0.2%以上、2.2%以下であることを特徴とする。
また前記第1の発振領域と第2の発振領域とで(i)前記第1の振動領域、第2の振動領域の各々において前記圧電片を挟んで一面側と他面側とに設けられた励振電極の質量、(ii)前記第1の振動領域、第2の振動領域の各々における前記圧電片の厚さ、の少なくとも一方の値を異ならせることにより、前記周波数差を調節することが好ましい。
前記圧電振動子として前述したいずれかの圧電振動子を用い、前記第1の振動領域または第2の振動領域のいずれか一方の一面側に設けられた励振電極に前記吸着層を形成し、前記感知対象物を感知する雰囲気における前記第1の発振周波数と第2の発振周波数との周波数差が、これらの発振周波数の0.2%以上、2.2%以下であることを特徴とする。
ツインセンサ型の水晶振動子1を製作し、第1の振動領域105、第2の振動領域106から取り出される発振周波数の周波数差を変化させてその温度特性を比較した。
A.実験条件
周波数差を調節する手法としては、図3、図6を用いて説明したように、水晶片100の表面に形成する励振電極101、103の厚さを異ならせる手法を採用した。具体的には第2の振動領域106の励振電極103の厚さを一定とし、当該励振電極103に対して第1の振動領域105の励振電極101を厚くすることで周波数差を大きくし、第2の振動領域106側の厚さに近づけていくことで周波数差を小さくする調節を行った。なお2つの励振電極101、103の面積は等しく、水晶片100の厚さ及び裏面側の励振電極102の厚さについても2つの領域105、106間で等しくなるようにした。各励振電極101〜103を図5に示したコルピッツ型の発振回路111、112に接続し、水晶センサ3に緩衝溶液である食塩水を満たした状態にて水晶センサ3の置かれている周囲の温度を−20℃〜60℃の範囲で変化させて各チャンネルから出力された周波数信号の周波数特性を調べた。
基準温度25[℃]における発振周波数が以下のように設定された水晶振動子1の周波数温度特性を調べた。
第1の発振周波数F0:9.126[MHz]
第2の発振周波数F1:9.176[MHz]
周波数差ΔF=|F1−F0|=50[kHz](各発振周波数の約0.54%)
(比較例1)
基準温度25[℃]における発振周波数が以下のように設定された水晶振動子1の周波数温度特性を調べた。
第1の発振周波数F0:9.176[MHz]
第2の発振周波数F1:9.176[MHz]
周波数差ΔF=|F1−F0|=0[kHz](各発振周波数の0%)
(比較例2)
基準温度25[℃]における発振周波数が以下のように設定された水晶振動子1の周波数温度特性を調べた。
第1の発振周波数F0:9.161[MHz]
第2の発振周波数F1:9.176[MHz]
周波数差ΔF=|F1−F0|=15[kHz](各発振周波数の約0.16%)
(比較例3)
基準温度25[℃]における発振周波数が以下のように設定された水晶振動子1の周波数温度特性を調べた。
第1の発振周波数F0:8.926[MHz]
第2の発振周波数F1:9.176[MHz]
周波数差ΔF=|F1−F0|=250[kHz](各発振周波数の約2.7%)
(実施例1)、(比較例1)〜(比較例3)の結果を各々図14〜図17に示す。各図の横軸は水晶センサ3の置かれている雰囲気の温度を示し、縦軸は基準温度25[℃]に対して、周囲の温度を変化させたときの発振周波数の変化量を、基準温度における発振周波数に対する百万分率([ppm])で表示した結果(以下、周波数変化率という)を示している。各図中、第1の発振周波数の周波数変化率を黒塗りのひし形「◆」でプロットし、第2の発振周波数を黒塗りの四角「■」でプロットしてある。ここで図15〜図17のグラフにおいては、第1、第2の発振周波数の周波数変化率が重なり合って判別しにくくなることを避けるため、便宜上、第2の発振周波数の周波数変化率を実際のデータよりも2ppmだけ高い位置にプロットしてある。
水晶振動子
2 感知装置
3 水晶センサ
7a、7b
周波数温度特性
10 水晶発振器
40 発振回路ユニット
41 筐体
50 同軸ケーブル
60 装置本体
61 筐体
81 感知対象物
82 ブロック層
83 吸着層
100 水晶片
101〜104
励振電極
105 第1の振動領域
106 第2の振動領域
107 弾性境界層
111、112
発振回路
113〜115
端子
116、117
接続線
118 接地線
301 プリント基板
302 ゴムシート
303 上蓋ケース
304 注入口
305 観察口
601 スイッチ部
602 測定回路部
603 データバス
604 中央演算処理装置(CPU)
605 データ処理プログラム
606 第1メモリ
607 第2メモリ
608 表示部
609 入力手段
Claims (4)
- 予め定めた基準温度雰囲気下にて第1の発振周波数を取り出すために圧電片に設けられた第1の振動領域と、前記基準温度雰囲気下にて第1の発振周波数とは異なる第2の発振周波数を取り出すために、当該圧電片に設けられた弾性的な境界領域を介して前記第1の振動領域とは異なる領域に設けられた第2の振動領域と、を有し、これらの各振動領域に、前記圧電片を挟んで一面側と他面側とに設けられた励振電極を備えた圧電振動子において、
第1の発振周波数と第2の発振周波数との周波数差が、これらの発振周波数の0.2%以上、2.2%以下であることを特徴とする圧電振動子。 - 前記の各発振周波数は、4.0MHz以上、200MHz以下でることを特徴とする請求項1に記載の圧電振動子。
- 前記第1の発振領域と第2の発振領域とで下記(i)、(ii)の少なくとも一方の値を異ならせることにより、前記周波数差を調節したことを特徴とする圧電振動子。
(i)前記第1の振動領域、第2の振動領域の各々において前記圧電片を挟んで一面側と他面側とに設けられた励振電極の質量。
(ii)前記第1の振動領域、第2の振動領域の各々における前記圧電片の厚さ。 - 圧電片の一面側及び他面側に各々励振電極が設けられると共に、一面側の励振電極には試料溶液中の感知対象物を吸着する吸着層が形成され、他面側の励振電極は気密空間に臨む圧電振動子を備え、感知対象物が前記吸着層に吸着されることによる圧電振動子の発振周波数の変化に基づいて感知対象物を感知する感知センサにおいて、
前記圧電振動子として請求項1ないし3のいずれか一つに記載の圧電振動子を用い、前記第1の振動領域または第2の振動領域のいずれか一方の一面側に設けられた励振電極に前記吸着層を形成し、前記感知対象物を感知する雰囲気における前記第1の発振周波数と第2の発振周波数との周波数差が、これらの発振周波数の0.2%以上、2.2%以下であることを特徴とする感知センサ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008162266A JP4566252B2 (ja) | 2008-05-21 | 2008-06-20 | 感知装置 |
PCT/JP2009/054363 WO2009142046A1 (ja) | 2008-05-21 | 2009-03-02 | 圧電振動子及び感知センサ |
EP09750408A EP2280481A1 (en) | 2008-05-21 | 2009-03-02 | Piezoelectric oscillator and detecting sensor |
CN200980118666.4A CN102037643B (zh) | 2008-05-21 | 2009-03-02 | 压电振子及探测传感器 |
US12/736,805 US8298486B2 (en) | 2008-05-21 | 2009-03-02 | Piezoelectric resonator and sensing sensor |
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Cited By (5)
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JP2011027717A (ja) * | 2009-06-30 | 2011-02-10 | Nippon Dempa Kogyo Co Ltd | 感知装置 |
JP2012008029A (ja) * | 2010-06-25 | 2012-01-12 | Nippon Dempa Kogyo Co Ltd | 感知装置 |
JP2012160790A (ja) * | 2011-01-28 | 2012-08-23 | Nippon Dempa Kogyo Co Ltd | 発振装置 |
US9086338B2 (en) | 2010-06-25 | 2015-07-21 | Nihon Dempa Kogyo Co., Ltd. | Sensing device |
CN108123694A (zh) * | 2018-01-03 | 2018-06-05 | 宁波大红鹰学院 | 一种电极优化设计的压电薄膜谐振器 |
Families Citing this family (7)
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JP2013051673A (ja) * | 2011-07-29 | 2013-03-14 | Nippon Dempa Kogyo Co Ltd | 水晶振動子及び水晶発振器 |
JP6036828B2 (ja) * | 2012-08-10 | 2016-11-30 | 富士通株式会社 | Qcmセンサとその製造方法 |
JP6199128B2 (ja) * | 2012-12-17 | 2017-09-20 | セイコーインスツル株式会社 | Qcmセンサ |
WO2015116104A1 (en) * | 2014-01-30 | 2015-08-06 | Empire Technology Development Llc | Crystal oscillators and methods for fabricating the same |
US9791503B1 (en) * | 2015-09-30 | 2017-10-17 | Integrated Device Technology, Inc. | Packaged oscillators with built-in self-test circuits that support resonator testing with reduced pin count |
CN106546508B (zh) * | 2017-01-22 | 2019-07-26 | 东南大学 | 一种吸附材料吸附性能实验自动称重装置及方法 |
CN111817678B (zh) * | 2020-07-03 | 2021-12-28 | 中国科学院上海微系统与信息技术研究所 | 单片式混合集成声波谐振器阵列及其制备方法 |
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- 2009-03-02 US US12/736,805 patent/US8298486B2/en not_active Expired - Fee Related
- 2009-03-02 EP EP09750408A patent/EP2280481A1/en not_active Withdrawn
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JP2004317493A (ja) * | 2003-03-28 | 2004-11-11 | Citizen Watch Co Ltd | Qcmセンサーおよびqcmセンサー装置 |
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JP2012008029A (ja) * | 2010-06-25 | 2012-01-12 | Nippon Dempa Kogyo Co Ltd | 感知装置 |
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JP2012160790A (ja) * | 2011-01-28 | 2012-08-23 | Nippon Dempa Kogyo Co Ltd | 発振装置 |
CN108123694A (zh) * | 2018-01-03 | 2018-06-05 | 宁波大红鹰学院 | 一种电极优化设计的压电薄膜谐振器 |
Also Published As
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WO2009142046A1 (ja) | 2009-11-26 |
EP2280481A1 (en) | 2011-02-02 |
US8298486B2 (en) | 2012-10-30 |
CN102037643A (zh) | 2011-04-27 |
JP4566252B2 (ja) | 2010-10-20 |
CN102037643B (zh) | 2014-11-26 |
US20110064614A1 (en) | 2011-03-17 |
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