JP2013219667A - Vibration detector - Google Patents

Vibration detector Download PDF

Info

Publication number
JP2013219667A
JP2013219667A JP2012090291A JP2012090291A JP2013219667A JP 2013219667 A JP2013219667 A JP 2013219667A JP 2012090291 A JP2012090291 A JP 2012090291A JP 2012090291 A JP2012090291 A JP 2012090291A JP 2013219667 A JP2013219667 A JP 2013219667A
Authority
JP
Japan
Prior art keywords
vibration
vibration detection
diaphragm
detection film
sensitivity
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
Application number
JP2012090291A
Other languages
Japanese (ja)
Inventor
Hiroshi Manabe
啓 真鍋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foster Electric Co Ltd
Original Assignee
Foster Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Foster Electric Co Ltd filed Critical Foster Electric Co Ltd
Priority to JP2012090291A priority Critical patent/JP2013219667A/en
Publication of JP2013219667A publication Critical patent/JP2013219667A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a vibration detector which improves the sensitivity of the vibration detector such as a flesh conduction microphone and also improves the productivity.SOLUTION: In a vibration detector, a vibration detection element (4) having a diaphragm (4a) on an upper surface is housed in a case body (3) having an opening (2a) at an upper part thereof. In the vibration detector, a sealed air chamber (7) is formed at an upper part of the diaphragm (4a) and a vibration detection film (6) is provided at the upper part of the air chamber (7). Further, the vibration detection film (6) does not contact with the diaphragm (4a). The structure reduces the mass of a vibration system to improve the sensitivity compared to conventional products. Further, a polymer elastomer liquid is not used in the manufacturing. Thus, the hardening time of the polymer elastomer liquid is omitted to improve the productivity.

Description

本発明は、例えば携帯電話や音声入力装置、電子聴診器などに用いられ、人体から発せられる振動を検出する振動検出装置に関する。   The present invention relates to a vibration detection device that is used in, for example, a mobile phone, a voice input device, an electronic stethoscope, and the like and detects vibrations emitted from a human body.

近年、人体から直接音声を収音する接触型マイクロホンとして、骨伝導マイクロホンや肉伝導マイクロホンが開発され注目されている(非特許文献1、2参照)。   In recent years, bone-conduction microphones and meat-conduction microphones have been developed and attracted attention as contact-type microphones that directly pick up sound from the human body (see Non-Patent Documents 1 and 2).

骨伝導マイクロホンは、人体の骨を媒体とする音の伝達を利用するものであり、額部分などの比較的皮膚の薄いところにマイクとなるセンサを取り付けて音声等収音する。   The bone conduction microphone utilizes sound transmission using a human bone as a medium, and a microphone sensor is attached to a relatively thin part of the skin such as the forehead to collect sound.

一方、肉伝達マイクロホンは、人体の軟部組織、例えば皮膚や筋肉、脂肪などの弾性のある組織を媒体とする音の伝達を収音するものであり、首部や耳の下部に振動検出素子を接触させてささやき声のような極小さな体導音を拾うものが提案されている(非特許文献2参照)。ここに体導音としては、肉導音や骨導音をいう。これに対し、空気を伝搬する音は気導音という。なお、肉導音は肉伝導による音のことである。肉伝導マイクロホンは電子聴診器などに使われ、軟部組織を介して伝わる体導音を直接サンプリングできるので、通常の発声音量より小さいものでも感度良く検出できるという利点がある。   On the other hand, a meat transfer microphone collects sound transmission through soft tissues of the human body, such as elastic tissues such as skin, muscles, and fats. The vibration detection element is in contact with the neck and the lower part of the ear. What picks up a very small body-conducted sound like a whispering voice is proposed (refer nonpatent literature 2). The body-conducted sound here refers to a meat-conducted sound or a bone-conducted sound. On the other hand, sound that propagates in air is called air conduction sound. Note that the meat conduction sound is a sound caused by meat conduction. The meat conduction microphone is used for an electronic stethoscope and can directly sample the body conduction sound transmitted through the soft tissue, so that it has an advantage that even a sound volume smaller than a normal utterance volume can be detected with high sensitivity.

図4は、この種の一従来例の振動検出装置の概略断面図を示す。   FIG. 4 is a schematic cross-sectional view of a conventional vibration detection apparatus of this type.

下ケース1’と、開口部2a’を有する上ケース2’とからなるケース本体3’の中に、上面に振動板4a’を有する振動検出素子4’が内蔵されている。   A vibration detection element 4 ′ having a vibration plate 4 a ′ on the upper surface is incorporated in a case body 3 ′ composed of a lower case 1 ′ and an upper case 2 ′ having an opening 2 a ′.

そして、ケース本体3’内の振動検出素子4’の上部および外側面周囲等には振動伝達媒体兼封止部材として機能する高分子エラストマー5’が設けられた構造となっており、この高分子エラストマー5’は高分子エラストマー液からなり、振動板4a’の上面部分は高分子エラストマー5’が密着している。   A polymer elastomer 5 ′ functioning as a vibration transmission medium and sealing member is provided on the upper portion of the vibration detection element 4 ′ in the case body 3 ′, around the outer surface, and the like. The elastomer 5 ′ is made of a polymer elastomer liquid, and the upper surface portion of the diaphragm 4a ′ is in close contact with the polymer elastomer 5 ′.

図4に示した例とは若干構成が異なるが、振動検出素子4’の周囲が高分子エラストマー5’によって覆われた振動検出装置は、既に本願出願人によって提出されている(特許文献1参照)。   Although the configuration is slightly different from the example shown in FIG. 4, a vibration detection device in which the periphery of the vibration detection element 4 ′ is covered with a polymer elastomer 5 ′ has already been submitted by the present applicant (see Patent Document 1). ).

WO 2012/035572WO 2012/035572

社団法人情報処理学会研究報告(JPSJ SIG Technical Report)2004-HI-109(6) 2004-SLP-52(6) 2004/7/16 pp.33-40 中島淑貴、竹笛浩司、柏岡秀紀、鹿野清宏、ニックキャンベル、“NAM Interface Communication”Information Processing Society of Japan (JPSJ SIG Technical Report) 2004-HI-109 (6) 2004-SLP-52 (6) 2004/7/16 pp.33-40 Yuki Nakajima, Koji Takefue, Hideki Sasaoka, Kiyohiro Shikano, Nick Campbell, “NAM Interface Communication” 日本音響学会講演論文集 2008年9月 pp.637-638 清水奨大、平原達也、大谷真、「小型体導音センサの構造と感度特性」Proceedings of the Acoustical Society of Japan September 2008 pp.637-638 Shodai Shimizu, Tatsuya Hirahara, Makoto Otani, “Structure and sensitivity characteristics of small body acoustic sensors”

肉伝導マイクロホンは、一般に、軟部組織の体導音サンプリング用に使用されるなどし、感度が良好であることが好ましい。   In general, the meat conduction microphone is preferably used for sampling the body conduction sound of soft tissue, and preferably has good sensitivity.

マイクロホンの振動系質量と感度の関係は下式(数1)により表される。   The relationship between the vibration system mass and sensitivity of the microphone is expressed by the following equation (Equation 1).

Figure 2013219667
Figure 2013219667

したがって、振動検出素子4’の振動板4a’に高分子エラストマー5’を密着させた構造では、振動系質量が大きいため、感度が低く、感度向上の課題があった。   Therefore, in the structure in which the polymer elastomer 5 ′ is in close contact with the vibration plate 4 a ′ of the vibration detection element 4 ′, the vibration system mass is large, so the sensitivity is low and there is a problem of improving the sensitivity.

また、振動検出素子4’の振動板4a’の上面に高分子エラストマー5’を密着させた構造の振動検出装置としているため、時間硬化型の高分子エラストマー液を用いて製作する必要があり、この場合、硬化するまでの時間がかかるなどし、生産性が悪く、生産性改善が望まれていた。   Further, since the vibration detecting device has a structure in which the polymer elastomer 5 ′ is in close contact with the upper surface of the vibration plate 4a ′ of the vibration detecting element 4 ′, it is necessary to manufacture using a time-curable polymer elastomer liquid. In this case, it takes a long time to cure, and the productivity is poor, and improvement in productivity has been desired.

この発明は上記のことに鑑み提案されたもので、その目的とするところは、感度を向上させ、かつ生産性も向上させた振動検出装置を提供することにある。   The present invention has been proposed in view of the above, and an object of the present invention is to provide a vibration detection apparatus with improved sensitivity and improved productivity.

請求項1にかかる本発明の振動検出装置は、上部に開口部2aを有するケース本体3内に、上面に振動板4aを有する振動検出素子4が収納された振動検出装置において、前記振動板4aの上部に密閉状の空気室7を形成し、空気室7の上部に振動検出膜6を設け、この振動検出膜6と前記振動板4aとを非接触としたことを特徴とする。
請求項2の発明は、請求項1記載の振動検出装置において、前記振動検出膜6は、樹脂または金属からなることを特徴とする。
The vibration detection device according to the first aspect of the present invention is the vibration detection device in which the vibration detection element 4 having the vibration plate 4a on the upper surface is housed in the case body 3 having the opening 2a on the upper portion. A hermetic air chamber 7 is formed on the upper portion of the air chamber 7, a vibration detection film 6 is provided on the upper portion of the air chamber 7, and the vibration detection film 6 and the vibration plate 4 a are not in contact with each other.
According to a second aspect of the present invention, in the vibration detection device according to the first aspect, the vibration detection film 6 is made of resin or metal.

本発明によれば、振動板4aの上面に空気室7を設け、振動検出膜6を振動板4aに密着させないため、振動系の質量が増大することがなく、感度を向上させることができ、かつ製作にあたり、振動検出膜として高分子エラストマー液を使用しないため、生産性も向上させることができる。   According to the present invention, since the air chamber 7 is provided on the upper surface of the vibration plate 4a and the vibration detection film 6 is not closely attached to the vibration plate 4a, the mass of the vibration system is not increased, and the sensitivity can be improved. In production, since the polymer elastomer liquid is not used as the vibration detection film, productivity can be improved.

(a)は本発明の一実施例に係る振動検出装置の上面図、(b)は(a)中A−A線断面図を示す。(A) is a top view of the vibration detector according to one embodiment of the present invention, and (b) is a cross-sectional view taken along line AA in (a). 使用状態の説明図を示すAn explanatory diagram of the usage state is shown. 本発明と従来品の周波数に対する感度特性を示す。The sensitivity characteristic with respect to the frequency of this invention and a conventional product is shown. 一従来例の概略断面図を示す。The schematic sectional drawing of one prior art example is shown.

以下、図面を参照しながら本発明を説明する。   The present invention will be described below with reference to the drawings.

図1(a)は、本発明の一実施例に係る振動検出装置の上面図、図1(b)は、図1(a)中、A−A線断面図である。図中1は樹脂または金属などで形成された下ケース、2は下ケース1の上に被せられ、かつ上部に開口部2aが形成された上ケースで、これら上下のケース1、2によってケース本体3が構成されている。   FIG. 1A is a top view of a vibration detecting apparatus according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line AA in FIG. In the figure, reference numeral 1 denotes a lower case formed of resin or metal, 2 denotes an upper case which is placed on the lower case 1 and has an opening 2a formed in the upper portion thereof. 3 is configured.

上ケース2の開口部2aの周囲外側は皮膚接触部2bとして機能する。なお、開口部2aの周面は、内部に皮膚を誘い込みやすいようにテーパ面に形成されている。   The outer periphery of the opening 2a of the upper case 2 functions as a skin contact portion 2b. The peripheral surface of the opening 2a is formed in a tapered surface so that the skin can be easily drawn into the inside.

4はケース本体3の内部に収納された、例えばエレクトレット膜を利用してなる振動検出素子で、上面は振動検出面としての振動板4aとなっている。   Reference numeral 4 denotes a vibration detecting element housed in the case body 3 and using, for example, an electret film, and the upper surface is a diaphragm 4a as a vibration detecting surface.

5は振動検出素子4の外側面から下面の一部にかけて設けられたほぼ筒状の成形品からなる吸音材である。   Reference numeral 5 denotes a sound absorbing material made of a substantially cylindrical molded product provided from the outer side surface of the vibration detecting element 4 to a part of the lower surface.

振動検出素子4は吸音材5に形成された段部5aによって支持されている。   The vibration detection element 4 is supported by a step portion 5 a formed in the sound absorbing material 5.

上下のケース1、2の内周面と振動検出素子4の外側面および下面の外周側に吸音材5を介在させたのは、上ケース2や、下ケース1の外側から振動検出素子4に加わる外部雑音を防ぐためである。   The sound absorbing material 5 is interposed on the inner peripheral surfaces of the upper and lower cases 1 and 2, the outer surface of the vibration detecting element 4, and the outer peripheral side of the lower surface. This is to prevent added external noise.

なお、振動検出素子4の上面の外側部には上方に向かって延びる腕部4bと、この腕部上端において内側に向かって折曲されたフランジ状の折曲部4cからなる振動検出膜支持部4dが形成されている。この振動検出膜支持部4dの中央には開口部4eが形成され、振動検出膜支持部4dの上部には薄い金属板または樹脂成形品からなる振動伝達媒体としての振動検出膜6が設けられている。   Note that the vibration detection element 4 includes an arm 4b extending upward on the outer surface of the upper surface of the vibration detection element 4 and a flange-shaped bent portion 4c bent inward at the upper end of the arm. 4d is formed. An opening 4e is formed at the center of the vibration detection film support 4d, and a vibration detection film 6 as a vibration transmission medium made of a thin metal plate or a resin molded product is provided above the vibration detection film support 4d. Yes.

したがって、振動検出膜6は振動検出膜支持部4dによって振動板4aの上面に接触することはなく、振動板4a、振動検出膜6、および振動検出膜支持部4dによって振動板4aの上面に空気が存在する密閉状の空気室7が区画形成され、振動板4aに振動検出膜6の質量が加わることはない。   Therefore, the vibration detection film 6 does not come into contact with the upper surface of the vibration plate 4a by the vibration detection film support portion 4d, and air is formed on the upper surface of the vibration plate 4a by the vibration plate 4a, the vibration detection film 6, and the vibration detection film support portion 4d. A sealed air chamber 7 in which the vibration detection film 6 exists is partitioned and the vibration detection film 6 is not added to the vibration plate 4a.

なお、振動検出素子4の底部中央に信号線8の一端部が接続され、信号線8の他端部は上ケース2と下ケース1に形成された筒状の信号線引出部3aから外部に引き出されている。9は埃がケース本体3内に侵入することを防止する封止材である。   One end of the signal line 8 is connected to the center of the bottom of the vibration detecting element 4, and the other end of the signal line 8 is connected to the outside from the cylindrical signal line lead-out part 3 a formed in the upper case 2 and the lower case 1. Has been pulled out. A sealing material 9 prevents dust from entering the case main body 3.

組立にあたっては、下ケース1内に吸音材5を収納し、かつ段部5aを介し信号線8の一端が接続された振動検出素子4を配置する。信号線8の他端は信号線引出部3aを介し外部に引き出される。   In assembly, the vibration detection element 4 in which the sound absorbing material 5 is housed in the lower case 1 and one end of the signal line 8 is connected via the stepped portion 5a is disposed. The other end of the signal line 8 is drawn to the outside through the signal line lead portion 3a.

ついで、振動検出膜支持部4dの上部に振動検出膜6を設け、下ケース1に対し上ケース2を被せ接着すれば良く、組立性が良く生産性が向上し、製造コストを安価にし得る。   Next, the vibration detection film 6 may be provided on the vibration detection film support 4d, and the upper case 2 may be covered and bonded to the lower case 1, so that the assembling property is improved, the productivity is improved, and the manufacturing cost can be reduced.

使用にあたっては、図2に示すように、上ケース2の皮膚接触部2bを皮膚10に押し当てる。皮膚10は開口部2aを介し振動検出膜6に当接し、体導音を、振動検出膜6、空気を介し振動検出素子4の振動板4aによって収音することができる。   In use, as shown in FIG. 2, the skin contact portion 2 b of the upper case 2 is pressed against the skin 10. The skin 10 comes into contact with the vibration detection film 6 through the opening 2a, and the body conduction sound can be collected by the vibration detection film 6 and the vibration plate 4a of the vibration detection element 4 through the air.

この場合、振動板4aには、従来のように、高分子エラストマーが密着していないため、高分子エラストマーの質量は加わることはなく、感度が向上する。   In this case, since the polymer elastomer is not in close contact with the diaphragm 4a as in the prior art, the mass of the polymer elastomer is not added, and the sensitivity is improved.

図3は周波数に対する感度特性を示し、Aは本発明品、Bは従来品である。本発明品では従来品に比べ幅広い周波数で感度が向上し、1[kHz]では感度が約50[dB]向上した。   FIG. 3 shows sensitivity characteristics with respect to frequency. A is a product of the present invention and B is a conventional product. The sensitivity of the product of the present invention was improved over a wide range of frequencies compared to the conventional product, and the sensitivity was improved by about 50 [dB] at 1 [kHz].

1 下ケース
2 上ケース
2a 開口部
2b 皮膚接触部
3 ケース本体
3a 信号線引出部
4 振動検出素子
4a 振動板
4b 腕部
4c 折曲部
4d 振動検出膜支持部
4e 開口部
5 吸音材
5a 段部
6 振動検出膜
7 空気室
8 信号線
9 封止材
10 皮膚
A 本発明品
B 従来品
DESCRIPTION OF SYMBOLS 1 Lower case 2 Upper case 2a Opening part 2b Skin contact part 3 Case main body 3a Signal line extraction part 4 Vibration detection element 4a Diaphragm 4b Arm part 4c Bending part 4d Vibration detection film | membrane support part 4e Opening part 5 Sound absorption material 5a Step part 6 Vibration detection film 7 Air chamber 8 Signal line 9 Sealing material 10 Skin A Invention product B Conventional product

Claims (2)

上部に開口部(2a)を有するケース本体(3)内に、上面に振動板(4a)を有する振動検出素子(4)が収納された振動検出装置において、
前記振動板(4a)の上部に密閉状の空気室(7)を形成し、空気室(7)の上部に振動検出膜(6)を設け、この振動検出膜(6)と前記振動板(4a)とを非接触としたことを特徴とする振動検出装置。
In the vibration detection device in which the vibration detection element (4) having the diaphragm (4a) on the upper surface is housed in the case body (3) having the opening (2a) on the upper part,
A hermetic air chamber (7) is formed above the diaphragm (4a), and a vibration detection film (6) is provided above the air chamber (7). The vibration detection film (6) and the diaphragm ( 4a) is a non-contact type vibration detecting device.
請求項1記載の振動検出装置において、前記振動検出膜(6)は、樹脂または金属からなることを特徴とする振動検出装置。
The vibration detection apparatus according to claim 1, wherein the vibration detection film (6) is made of resin or metal.
JP2012090291A 2012-04-11 2012-04-11 Vibration detector Pending JP2013219667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012090291A JP2013219667A (en) 2012-04-11 2012-04-11 Vibration detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012090291A JP2013219667A (en) 2012-04-11 2012-04-11 Vibration detector

Publications (1)

Publication Number Publication Date
JP2013219667A true JP2013219667A (en) 2013-10-24

Family

ID=49591285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2012090291A Pending JP2013219667A (en) 2012-04-11 2012-04-11 Vibration detector

Country Status (1)

Country Link
JP (1) JP2013219667A (en)

Similar Documents

Publication Publication Date Title
JP5036831B2 (en) Vibration pickup microphone
JP5383870B2 (en) Electronics
JP5969817B2 (en) Electronics
JP5952092B2 (en) Electronics
WO2015162913A1 (en) Earphone
KR20050106482A (en) Bone conduction device
CN218162856U (en) Vibration sensor
US9438986B2 (en) In-ear headphone with sound pick-up capability
JPWO2008105180A1 (en) Vibration pickup type microphone
JP6022209B2 (en) Electronic device, control method of electronic device
CN112602333B (en) Bone conduction microphone
CN110300362B (en) Electret bone conduction vibration microphone
JP2014011703A (en) Capacitor microphone
WO2012042572A1 (en) Vibration detection device
JP2013219667A (en) Vibration detector
JP2017112479A (en) Contact microphone
CN114697824A (en) Vibration sensor
CN105657588A (en) Bone conduction type microphone
JP2007043516A (en) Microphone for picking up body propagation of articulatory expiration sounds
JP6253101B2 (en) Electrodynamic electroacoustic transducer, diaphragm thereof, and method for producing electrodynamic electroacoustic transducer
JP5190033B2 (en) Vibration sensor
WO2012035578A1 (en) Vibration detection device
WO2012035572A1 (en) Vibration detection device
JP5475070B2 (en) Contact microphone
JP6471391B2 (en) MRI phone