JPS6070324A - Pressure sensor - Google Patents
Pressure sensorInfo
- Publication number
- JPS6070324A JPS6070324A JP17851583A JP17851583A JPS6070324A JP S6070324 A JPS6070324 A JP S6070324A JP 17851583 A JP17851583 A JP 17851583A JP 17851583 A JP17851583 A JP 17851583A JP S6070324 A JPS6070324 A JP S6070324A
- Authority
- JP
- Japan
- Prior art keywords
- light
- pressure
- diaphragm
- spring
- contact
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/0076—Transmitting or indicating the displacement of flexible diaphragms using photoelectric means
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は圧力の変化を電気的に検知する圧力センサに関
する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pressure sensor that electrically detects changes in pressure.
従来例の構成とその問題点
最近の各種装置の電子化にともない、圧力を電気信号と
して取シ出すことができる電子式圧力センサに対するニ
ーズが高まっている。特にマイクロコンピュータによる
高性能な信号処理が手軽に行なうことができるようにな
り、圧力センサにおいても工業計測用から家電などの一
般用として低価でかつ信頼性の高いものが要求されてい
る。BACKGROUND ART Conventional Structures and Problems With the recent electronicization of various devices, there is an increasing need for electronic pressure sensors that can extract pressure as an electrical signal. In particular, it has become easy to perform high-performance signal processing using microcomputers, and low-cost and highly reliable pressure sensors are required for both industrial measurement and general use such as household appliances.
以下に洗濯機の水位を圧力に変換し、その圧力変化を電
気的に検知する従来の圧力センサについて図面を用いて
説明する。A conventional pressure sensor that converts the water level of a washing machine into pressure and electrically detects the change in pressure will be described below with reference to the drawings.
第１図において、１は脱水槽兼洗濯槽、２は水受、３は
脱水孔で脱水槽兼洗濯槽１内に給水された水は脱水孔３
を通って水受２に留る。In Fig. 1, 1 is a spin-drying tank/washing tank, 2 is a water receiver, and 3 is a dehydration hole, and the water supplied to the spin-drying tank/washing tub 1 is passed through the dehydration hole 3.
It passes through and stays in water tray 2.
４は水受２側面に設けられたエアートラップ室、６はエ
アートラップ室４に接続されたエアーホース、６はエア
ーホース５に接続された圧力センサ、７はモータで、ベ
ルト８とメカケース９内の減速機構等を介してパルセー
タ１０捷たけ脱水槽兼洗濯槽１を回転させる。4 is an air trap chamber provided on the side of the water receiver 2, 6 is an air hose connected to the air trap chamber 4, 6 is a pressure sensor connected to the air hose 5, 7 is a motor, and a belt 8 and a mechanical case 9 are connected. The dehydration tub/washing tub 1 is rotated by the amount of the pulsator 10 via a speed reduction mechanism or the like.
この圧力センサ６について第２図、第３図、第４図を用
いて説明する。This pressure sensor 6 will be explained using FIG. 2, FIG. 3, and FIG. 4.
１１は圧力の変化を機械的変位に変換するダイヤスラム
で、その外周１２は、フタ１３とケース１４とによりシ
ールされて卦り、ダイヤフラム１１とフタ１３間には空
気室１５が形成されている。Reference numeral 11 denotes a diaphragm that converts changes in pressure into mechanical displacement. Its outer periphery 12 is sealed by a lid 13 and a case 14, and an air chamber 15 is formed between the diaphragm 11 and the lid 13. .
フタ１３にはエアー導入口１６とダイヤフラム１１のス
トッパー１７が設けられており、エアー導入口１６には
第１図に示したエアーホース５が接続されている。ケー
ス１４の内部には１対の常開接点１８、常閉接点１９が
配置され、ケース１４に固定された常開端子１８ａ、常
閉端子１９ａに電気的接続されている。寸だ接点ノくネ
２ｏの先端に設けられた共通接点２１は前記常開接点１
８、常閉接点１９間に配置され、かつ常開接点１８、常
閉接点１９間を往復運動が可能なようにケース１４に片
持ちで固定され、同時に共通端子２１ａに電気的に接続
されている。接点バネ２０には第４図に示すように、コ
字状の穴２２が設けられており、その内側に位置する長
穴２３を有する内部板２４と、外側に位置する共通接点
２１を有する外部板２５とから成り、内部板２４と外部
板２５間には速断用のトグルバネ２６が設置されている
。前記ダイヤフラム１１上には、前記接点バネ２ｏの内
部板２４に設けられた長穴２３に嵌合して、ダイヤフラ
ム１１の上下動作と前記内部板２４とを連動させる駆動
溝２７とバネ受は部２８とを有するダイヤフラム板２９
が設けられている。前記ダイヤフラム板２９のバネ受は
部２８上には圧力に対するダイヤフラム１１の動作比率
を決定するバネ３ｏが設けられ、ケース１４に対して回
転方向に規制され、上下方向に摺動可能なバネ受け３１
を介してカム３２で固定されている。カム３２はケース
１４に固定された軸３３を中心に回転し、複数段階の圧
力（水位）に対応できるように軸３３からカム３２外周
ｔでｏ距離ｌ！１，１２．ｅ３，１４はそれぞれ異なっ
ている。カム３２を回転させることにより、軸３３から
バネ受け３１までの距離を変え、バネ３０のタワミ量を
変える事ができ、つまり圧力Ｐによシダイヤフラム１１
に発生する力ｆ、 Ｋ比べ、ストッパー１７側へバネ３
０、トグルバネ２６によって押圧する力が大きい場合は
、ダイヤフラム板２９はダイヤフラム１１を介してスト
ッパー１７で停止しているが、圧力Ｐによシダイヤフラ
ム１１に発生する力ｆ１が、ストッパー１７側へバネ３
０、トグルバネ２６によって抑圧する力より大きくなっ
た時点で、ダイヤフラム板２９は移動を開始する。その
後は圧力Ｐに対するダイヤフラム板２９の移動距離は比
例するため、ダイヤフラム板２９の移動を開始する圧力
Ｐを手動でカム３２を操作することにより複数段階の圧
力Ｐの検出を可能にしていた。The lid 13 is provided with an air inlet 16 and a stopper 17 for the diaphragm 11, and the air hose 5 shown in FIG. 1 is connected to the air inlet 16. A pair of normally open contacts 18 and a normally closed contact 19 are arranged inside the case 14, and are electrically connected to a normally open terminal 18a and a normally closed terminal 19a fixed to the case 14. A common contact 21 provided at the tip of the contact hole 2o is the normally open contact 1.
8. It is arranged between the normally closed contacts 19, and is cantilevered and fixed to the case 14 so as to be able to reciprocate between the normally open contacts 18 and the normally closed contacts 19, and is electrically connected to the common terminal 21a at the same time. There is. As shown in FIG. 4, the contact spring 20 is provided with a U-shaped hole 22, an inner plate 24 having a long hole 23 located inside the hole 22, and an outer plate 24 having a common contact 21 located outside the U-shaped hole 22. A toggle spring 26 for quick disconnection is installed between the inner plate 24 and the outer plate 25. On the diaphragm 11, there is a drive groove 27 and a spring receiver that fit into the elongated hole 23 provided in the inner plate 24 of the contact spring 2o to interlock the vertical movement of the diaphragm 11 and the inner plate 24. 28 and a diaphragm plate 29 having
is provided. The spring receiver of the diaphragm plate 29 is provided with a spring 3o on the portion 28 that determines the operating ratio of the diaphragm 11 with respect to pressure, and is restricted in the rotational direction with respect to the case 14 and is slidable in the vertical direction.
It is fixed with a cam 32 via. The cam 32 rotates around a shaft 33 fixed to the case 14, and has a distance l! from the shaft 33 to the outer circumference t of the cam 32 so that it can respond to multiple levels of pressure (water level). 1,12. e3 and e14 are different from each other. By rotating the cam 32, the distance from the shaft 33 to the spring receiver 31 can be changed, and the amount of deflection of the spring 30 can be changed.
Compared to the forces f and K generated in the spring 3 toward the stopper 17,
0, when the pressing force by the toggle spring 26 is large, the diaphragm plate 29 is stopped at the stopper 17 via the diaphragm 11, but the force f1 generated on the diaphragm 11 due to the pressure P causes the spring to move toward the stopper 17. 3
0, the diaphragm plate 29 starts moving when the force becomes greater than the force suppressed by the toggle spring 26. After that, since the moving distance of the diaphragm plate 29 is proportional to the pressure P, the pressure P at which the diaphragm plate 29 starts moving can be detected in multiple stages by manually operating the cam 32.
また洗濯機等に用いる圧力センザでは５００ｍｍＨ２ｏ
以下の低圧力検知を行なうため、ダイヤフラム１１はゴ
ム等の月料でかつ板厚の薄いものを用い微圧力変化に対
しても敏感に動作する構成に成っている。In addition, pressure sensors used in washing machines, etc.
In order to perform the following low pressure detection, the diaphragm 11 is made of a material such as rubber and has a thin plate, and is configured to operate sensitively even to slight pressure changes.
次に上記のように構成された従来の圧力センサを用いた
洗濯機の水位検知動作について説明する。Next, a water level detection operation of a washing machine using the conventional pressure sensor configured as described above will be explained.
まず第１図を用いて全体概要を説明する。洗濯を行なう
前に、洗濯物の量に応じて予じめ圧力センサ６の水位設
定を行なう。そして洗濯機の水受２に給水するとエアー
トラップ室４、エアーホース５内の空気は水位に応じて
圧縮される。この空気圧を圧力センサ６が検出する。First, the overall outline will be explained using FIG. 1. Before washing, the water level of the pressure sensor 6 is set in advance according to the amount of laundry. When water is supplied to the water receiver 2 of the washing machine, the air in the air trap chamber 4 and air hose 5 is compressed according to the water level. A pressure sensor 6 detects this air pressure.
次にこの圧力センサ６の動作を説明する。まず圧力が大
気圧の場合は第２図に示すように、ダイヤフラム板２９
はダイヤフラム１１を介してストッパー１７にバネ３０
、トグルバネ２６により押圧されており、接点バネ２０
の外部板２５に設けられた共通接点２１は常閉接点１９
に接触していてオフの状態である。つまり接点ノ（ネ２
０の内部板２４はバネ３０によシ押圧されて外部板２５
よりダイヤフラム１１側に位置し、そのためトグルバネ
２６により外部板２５の共通接点２１は常閉接点１９を
押圧している。Next, the operation of this pressure sensor 6 will be explained. First, if the pressure is atmospheric pressure, as shown in Figure 2, the diaphragm plate 29
The spring 30 is connected to the stopper 17 via the diaphragm 11.
, is pressed by the toggle spring 26, and the contact spring 20
The common contact 21 provided on the external plate 25 of is the normally closed contact 19
is in contact with and is off. In other words, the contact point (ne2
The inner plate 24 of 0 is pressed by the spring 30 and the outer plate 25
The common contact 21 of the outer plate 25 is located closer to the diaphragm 11 , so the common contact 21 of the outer plate 25 presses the normally closed contact 19 due to the toggle spring 26 .
その後、水位が増加しある圧力Ｐ１になるとダイヤフラ
ム板２９が移動を開始する。さらに水位が増加し、接点
バネ２０の外部板２５、トグルバネ２６、内部板２４は
水平状態に成り、ついには圧力がＰ２になると第３図に
示すように接点バネ２ｏの外部板２５より内部板２４が
カム３２側に位置するため、トグルバネ２６は急速に外
部板２５をダイヤフラム１１側へ押圧し、外部板２６の
先端に設けられた共通接点２１は常開接点１８に接触し
オンの状態になる。さらに水位を増加しても、このオン
の状態を保つものである。Thereafter, when the water level increases and reaches a certain pressure P1, the diaphragm plate 29 starts moving. As the water level further increases, the outer plate 25, toggle spring 26, and inner plate 24 of the contact spring 20 become horizontal, and finally, when the pressure reaches P2, the outer plate 25 of the contact spring 2o becomes closer to the inner plate as shown in FIG. 24 is located on the cam 32 side, the toggle spring 26 rapidly presses the outer plate 25 toward the diaphragm 11, and the common contact 21 provided at the tip of the outer plate 26 contacts the normally open contact 18 and turns on. Become. Even if the water level is further increased, it will remain in this on state.
次に排水の」場合を説明すると、前記圧力Ｐ２以上の水
位の場合は上述した給水時と同様に常開接点１８と共通
接点２１が接触してオンの状態を保ち、さらに排水して
圧力がＰ２以下になってもこの状態を保ち、さらに排水
して圧力がＰｌになると接点バネ２０の内部板２４は外
部板２５よりダイヤフラム１１側に位置するため、トグ
ルバネ２６は急速に外部板２５をカム３２側に押圧して
、共通接点２１は常閉接点１９に接触してオフの状態に
なり、さらに排水してもこのオフの状態を保つものであ
る。Next, to explain the case of draining water, when the water level is higher than the pressure P2, the normally open contact 18 and the common contact 21 are in contact and remain in the on state, as in the case of water supply, and further water is drained and the pressure is increased. This state is maintained even when the pressure drops below P2, and when the water is drained further and the pressure reaches Pl, the inner plate 24 of the contact spring 20 is located closer to the diaphragm 11 than the outer plate 25, so the toggle spring 26 rapidly cams the outer plate 25. 32 side, the common contact 21 comes into contact with the normally closed contact 19 and turns off, and remains in this off state even when water is drained.
第５図はこの圧力センサによって得られる出力図を示し
ている。イ線は圧力の上昇に対する出力図であり、口線
は下降に対する出力図である。洗濯機の圧力センサ６で
はＰ２点を検出して給水をストップする構成になってい
る。Ｐ２点は使用者が洗濯物の量によって決定し７、カ
ム３２を回転させる事により検出する圧力Ｐ２を変える
事ができる。またＰｌとＰ２の差はトグルバネ２６の影
響が大きく、つまり給水時はダイヤフラム板２９をス］
・ツバ−１７側に押える力が働き、逆に排水時はダイヤ
フラム板２９をカム３２側に押える力が働くためである
。FIG. 5 shows the output diagram obtained by this pressure sensor. The A line is an output diagram for increasing pressure, and the open line is an output diagram for decreasing pressure. The pressure sensor 6 of the washing machine is configured to detect point P2 and stop water supply. The user determines the P2 point according to the amount of laundry 7, and by rotating the cam 32, the detected pressure P2 can be changed. In addition, the difference between Pl and P2 is largely influenced by the toggle spring 26, which means that the diaphragm plate 29 is moved when water is supplied.
- This is because a pressing force acts on the collar 17 side, and conversely, a pressing force acts on the diaphragm plate 29 towards the cam 32 side during drainage.
しかしながらこのような構成では、以下のような問題が
あった。However, such a configuration has the following problems.
（１）トグルバネ２６を用いて速断式検出にしているた
め、設定圧力以上に測定圧力の最高値が到達したかどう
かの情報を得る圧力センザであった。つまり第６図に示
すように給水時の検出点Ｐ２と排水時の検出点Ｐ１の差
が大きいため、１度オンの状態になると、前記Ｐ１とＰ
２の間に低下してもオンの状態を保ち、刻々上下に変化
する圧力を検出する圧力センサ６としては不向きであっ
た。丑たこのような接点接触式の圧力センサ６ではｌ・
グルバネ２６を徐去した構成にすると、外部振動等によ
り、常開接点１８、常閉接点１９に対する共通接点２１
の接触状態が不安定になり、誤検知を行なうという問題
があった。(1) Since the toggle spring 26 is used for fast-acting detection, the pressure sensor obtains information as to whether the maximum value of the measured pressure has reached the set pressure or higher. In other words, as shown in Fig. 6, since there is a large difference between the detection point P2 during water supply and the detection point P1 during drainage, once the ON state is reached, the difference between P1 and P1 is large.
Even if the pressure decreases between 2 and 3, it remains in the on state, making it unsuitable as a pressure sensor 6 that detects pressure that changes up and down every moment. In the contact type pressure sensor 6 like this one, l・
If the configuration is such that the glide spring 26 is gradually removed, the common contact 21 for the normally open contact 18 and the normally closed contact 19 may be damaged due to external vibration or the like.
There was a problem in that the contact state of the sensor became unstable, resulting in false detection.
（２）検出する圧力の変化に対するダイヤフラム１１の
動作比率を決定する要素が、バネ３０の調性、トグルバ
ネ２６の調性、接点バネ２０の内部板２４の調性、ダイ
ヤフラム１１の調性等の複数点から成り、その役割が複
剋１化し困難であると同時に、各部品間の調性のバラツ
キが累積されるため、圧力センサー間の特性のバラツキ
が大きくなり、検出精度を悪くしていた。(2) The factors that determine the operating ratio of the diaphragm 11 with respect to changes in pressure to be detected include the tonality of the spring 30, the tonality of the toggle spring 26, the tonality of the internal plate 24 of the contact spring 20, the tonality of the diaphragm 11, etc. Consisting of multiple points, it is difficult to perform multiple functions, and at the same time, variations in tonality between each part accumulate, resulting in large variations in characteristics between pressure sensors and worsening detection accuracy. .
（３）圧力センザ６をマイコンと接続して使用する構成
では、微電流を流してその接続状態を検知するため、共
通接点２１、常開接点１８、常閉接点１９が酸化すると
安定した接続状態が得られなかった。そのため上記各接
点部には耐酸化性の良好な金、銀メッキ等が必要となり
、コスト高になっていた。(3) In a configuration in which the pressure sensor 6 is connected to a microcomputer, the connection state is detected by passing a small current, so if the common contact 21, normally open contact 18, and normally closed contact 19 are oxidized, the connection state becomes stable. was not obtained. Therefore, each of the contact points requires gold or silver plating with good oxidation resistance, resulting in high costs.
（４）共通接点２１が常閉接点１９、常開接点１８間を
移動する構成であるため、各接点間部は必ず空間を必要
とし、そのため水滴蒸気等が浸入し易く、各接点間に水
滴や異物が接触すると誤検知を行なうこともあり、使用
環境範囲が限定されていた。(4) Since the common contact 21 is configured to move between the normally closed contact 19 and the normally open contact 18, a space is always required between each contact, which makes it easy for water droplets and steam to enter, and water droplets between each contact. The range of environments in which it can be used is limited, as false detection may occur if it comes into contact with foreign matter.
発明の目的
本発明は上記問題点に鑑み圧力変動に対する追随性や圧
力の検出精度かよく、しかも発光素子や受光素子が故障
するか、もしくは断線しても最大圧力の検知ミスをなく
し使用機器の安全性を保つ信頼性の高い圧力センザを提
供するものである。Purpose of the Invention In view of the above-mentioned problems, the present invention improves followability to pressure fluctuations and pressure detection accuracy, eliminates errors in maximum pressure detection even if the light emitting element or light receiving element fails or is disconnected, and improves the accuracy of the equipment used. This provides a highly reliable pressure sensor that maintains safety.
発明の構成
本発明の圧力センサは発光素子と、この発光素子の光を
受ける受光素子と、圧力の変化を機械的変位に変換する
ダイヤフラムと、前記発光素子と前記受光素子の間に設
けられ前記ダイヤフラムの動作に連動する遮光板と、前
記圧力の変化に対する前記ダイヤフラムの機械的変位比
率を決定するバネとを備え、前記圧力が設定圧力の時は
前記発光素子からの光は全て前記受光素子に到達しない
構成で、光の有無により圧力を検知するため圧力の変化
に対する追随性や検出精度がよくしかも発光素子や受光
素子等が故障しても最大圧力の検知ミスをなくし、使用
機器の安全性を保つことができるものである。Structure of the Invention The pressure sensor of the present invention includes a light emitting element, a light receiving element that receives light from the light emitting element, a diaphragm that converts a change in pressure into a mechanical displacement, and a diaphragm that is provided between the light emitting element and the light receiving element. It includes a light shielding plate that is linked to the operation of the diaphragm, and a spring that determines the mechanical displacement ratio of the diaphragm with respect to a change in the pressure, and when the pressure is a set pressure, all the light from the light emitting element is directed to the light receiving element. The configuration detects pressure based on the presence or absence of light, so it has good followability and detection accuracy for changes in pressure.It also eliminates mistakes in detecting the maximum pressure even if the light-emitting element or light-receiving element breaks down, increasing the safety of the equipment used. It is something that can be maintained.
実施例の説明 以下本発明の一実施例について第６図、第７図。Description of examples An embodiment of the present invention will be described below with reference to FIGS. 6 and 7.
第８図、第９図を用いて説明する。This will be explained using FIGS. 8 and 9.
第６図、第７図、第８図、第９図において、白４は圧力
の変化を機械的変位に変換するダイヤフラムで、このダ
イヤフラム３４の外周にはシール用の凸部３６を設けＭ
Ｂ２とケース３７とでカシメリング３８によりカシメら
れてシールされておシ、ダイヤフラム３４と蓋３６間に
は空気室３９が形成されている。蓋３６にはエアー導入
口４０とダイヤフラム３４が下降する限度を規制するス
トッパー４１が設けられている。前記ダイヤフラム３４
には中央部にバネ受は用四部４２を有したダイヤフラム
板４３を設け、このダイヤフラム板４３の中央部からは
ずれた位置に、開口穴４４ａ、４４ｂ、４４ｃを有した
遮光板４５が垂直に設けられている。このダイヤフラム
板４３のバネ受は用凹部４２には圧力に対するダイヤフ
ラム板４３の動作比率を決定するバネ４６の一端が固定
され、このバネ４６の他端はケース３７に設けられてバ
ネ受け４７を介してバネ４６のタワミ量を調整する調整
ネジ４８により固定されている。In FIGS. 6, 7, 8, and 9, white 4 is a diaphragm that converts changes in pressure into mechanical displacement, and a convex portion 36 for sealing is provided on the outer periphery of this diaphragm 34.
B2 and the case 37 are caulked and sealed by a caulking ring 38, and an air chamber 39 is formed between the diaphragm 34 and the lid 36. The lid 36 is provided with a stopper 41 for regulating the lowering limit of the air inlet 40 and the diaphragm 34. The diaphragm 34
A diaphragm plate 43 is provided in the center of the diaphragm plate 43 having a spring support portion 42, and a light shielding plate 45 having opening holes 44a, 44b, and 44c is vertically provided at a position offset from the center of the diaphragm plate 43. It is being One end of a spring 46 that determines the operating ratio of the diaphragm plate 43 with respect to pressure is fixed in the recess 42 of the spring receiver of the diaphragm plate 43, and the other end of the spring 46 is provided in the case 37 and is connected via the spring receiver 47. It is fixed by an adjustment screw 48 that adjusts the amount of deflection of the spring 46.
また３対の発光素子４９ａ、受光素子５０ａと逮も
発光素子４９ｂ、素子６０ｂと発光素子４９Ｃ７受光素
子５０ ｃが前記ダイヤフラム３４と平行な一平面上に
、前記遮光板４５を介して対向するように設けられ、受
光素子５０ａ、５０ｂ、５０Ｃと遮光板４５の間には受
光素子５０ａ、５０ｂ。Further, three pairs of light emitting element 49a, light receiving element 50a, light emitting element 49b, light emitting element 60b, light emitting element 49C, and light receiving element 50c are arranged to face each other on one plane parallel to the diaphragm 34 with the light shielding plate 45 in between. The light receiving elements 50a, 50b are provided between the light receiving elements 50a, 50b, 50C and the light shielding plate 45.
５０ｃの正面の光だけを通過させるスリット５１を有し
た光遮蔽板５２が設けられている。６３はダイヤフラム
３４の背面側を常時大気圧に保つための穴である。A light shielding plate 52 is provided which has a slit 51 that allows only the light from the front of 50c to pass through. Reference numeral 63 is a hole for maintaining the back side of the diaphragm 34 at atmospheric pressure at all times.
次に上記構成における動作を説明する。Next, the operation in the above configuration will be explained.
まず空気室３９の圧力が大気圧の場合は第７図に示すよ
うに、ダイヤフラム板４３はダイヤフラム３４を介して
ストッパー４１にバネ４６により抑圧されている。この
状態においては遮光板４５の開口穴４４ａ 、４４．ｂ
、４４ｃと光遮蔽板５２のスリット５１は第８図に示
すように、全てが重なシ、発光素子４９ａ 、４９ｂ
、４９Ｃの光は各々受光素子５０ａ 、ｓｏｂ 、ｓ○
Ｃに到達し、受光素子が光を受けた時の信号をパ１″、
受けない時の信号を°゛０″とするとこの圧力センサは
” １１１ ”を感知し、圧力がかかっていないことを
検知する。First, when the pressure in the air chamber 39 is atmospheric pressure, the diaphragm plate 43 is pressed against the stopper 41 by the spring 46 via the diaphragm 34, as shown in FIG. In this state, the opening holes 44a, 44. b
, 44c and the slit 51 of the light shielding plate 52, as shown in FIG.
, 49C are transmitted through the light receiving elements 50a, sob, s○, respectively.
When the light reaches C and the light receiving element receives the signal, the signal is
If the signal when no pressure is received is '0', this pressure sensor senses '111' and detects that no pressure is applied.
寸だ、空気室３９の圧力が″中″の場合はダイヤフラム
３４及びダイヤフラム板４３はバネ４６に反して移動し
、遮光板４３の開口穴４４ａ。However, when the pressure in the air chamber 39 is "medium", the diaphragm 34 and the diaphragm plate 43 move against the spring 46, and the opening hole 44a of the light shielding plate 43 is closed.
４４ｂ 、４４０とスリット５１は第９図のように開口
穴ａ４ａ 、 ４４ｂけスリット６１と重ならず、開口
穴４４ｃだけがスリット５１と重なり、この圧力センサ
は”００１ ”と検知し、圧力が゛中″であることを検
知する。44b, 440 and slit 51 do not overlap with opening holes a4a, 44b and slit 61 as shown in FIG. 9, and only opening hole 44c overlaps with slit 51, and this pressure sensor detects "001" and the pressure is Detects that it is inside.
また空気室３９の圧力が゛′高″′の場合は、ダイヤフ
ラム３４及びダイヤフラム板はバネ４６に反して移動し
、遮光板４３の開口穴４４ａ、４４ｂ。Further, when the pressure in the air chamber 39 is "high", the diaphragm 34 and the diaphragm plate move against the spring 46, and the opening holes 44a, 44b of the light shielding plate 43 are closed.
４４ｃとスリット５１は全く重ならず、この圧力センサ
は”ｏ 、ｏ 、○″″と検知し、高力が高であること
を検知する。もし発光素子４９ａ、４９ｂ。44c and the slit 51 do not overlap at all, and this pressure sensor detects "o, o, ○"" and detects that the high force is high. If the light emitting elements 49a and 49b.
４９ｃや受光素子５０ａ 、５０ｂ 、５０ｃが故障す
るか、もしくは断線していて受光素子５０ａ。49c or the light receiving elements 50a, 50b, 50c are out of order, or the light receiving element 50a is disconnected.
５０ｂ 、５０ｃの内受光てきないものがあったとして
も、その受光素子は○″の信号を出し、中低圧力の検知
をミスしても、圧力が高である時の信号は必ず”ｏ、ｏ
、○パとなり高圧力をミスすること（徒ない。Even if there is something that does not receive light within 50b and 50c, that light-receiving element will output a signal of ○'', and even if a mistake is made in detecting medium or low pressure, the signal when the pressure is high will always be ``o''. o
, ○ Pa and miss the high pressure (it's a waste).
このことは、この圧力センサを洗濯機に用いた場合、高
水位の検知ミスがないことになり、決して水が水槽から
あふれ出すことはないものになる。This means that when this pressure sensor is used in a washing machine, there will be no mistake in detecting a high water level, and water will never overflow from the water tank.
まだ掃除機に使用した場合も、最大の負の圧力が加わっ
た時全ての光を遮蔽するべく開口穴４４ａ。Open hole 44a to block all light when maximum negative pressure is applied, even when used in a vacuum cleaner.
４４ｂ、４４Ｃを配置することにより、最大の負の圧力
を検知ミスすることはなく、モーターに過大な力がかか
ることもなくなる。By arranging 44b and 44C, the maximum negative pressure will not be detected incorrectly, and excessive force will not be applied to the motor.
なお、１つの発光素子の光を３つの受光素子で受けるか
、あるいは３つの発光素子を順に点灯し、１つの受光素
子で光を検出してもよいことはいうまでもない。It goes without saying that the light from one light emitting element may be received by three light receiving elements, or the three light emitting elements may be turned on in sequence and the light may be detected by one light receiving element.
また、従来の接点接触方式と異なり、光の有無により圧
力を検知するため、電気接点部を全て樹脂モールド等に
より電気絶縁が可能となり、使用するバネが大幅に減少
するため、材料費や組立て工数が減り、圧力検知精度が
大幅に向上するものである。In addition, unlike conventional contact contact methods, pressure is detected based on the presence or absence of light, so all electrical contacts can be electrically insulated by resin molding, etc., and the number of springs used is significantly reduced, resulting in material costs and assembly man-hours. This greatly improves pressure detection accuracy.
発明の効果
以上、本発明の詳細な説明からも明らかなように、本発
明によれば、圧力を機械的変位に変え、この機械的変位
により光を遮断し、光の有無により圧力を検知する構成
で圧力を検知する精度が飛躍的に向」ニし、また圧力が
検知し得る最大圧力に達した時に光を全て遮蔽すべく構
成することにより、受光・発光素子の故障もしくは断線
が発生しても、その最大圧力を検知ミスすることはなく
、使用する機器の信頼性を極めて高くするものである。In addition to the effects of the invention, as is clear from the detailed description of the invention, according to the invention, pressure is converted into mechanical displacement, light is blocked by this mechanical displacement, and pressure is detected by the presence or absence of light. This configuration dramatically improves the accuracy of pressure detection, and by configuring it to block all light when the pressure reaches the maximum detectable pressure, failure or disconnection of the light-receiving and light-emitting elements will not occur. However, the maximum pressure will not be detected incorrectly, and the reliability of the equipment used will be extremely high.
第１図は従来の圧力センザを用いた洗濯機の要部側面断
面図、第２図は従来の圧力センサの常開接点が開いてい
る状態を示す断面図、第３図は同常開接点が閉じている
状態を示す断面図、第４図は同要部拡大平面図、第５図
は同圧力センサの圧力と出力の関係図、第６図は本発明
の一実施例である圧力センサの要部側面断面図、第７図
は第６図のＣ−Ｂ−Ｃ断面図、第８図、第９図は遮光板
とスリットの関係を示す拡大側面図である。
３４・・・・・・ダイヤフラム、４５ ・・・遮光板、
４６・・・・・バネ、４９ａ 、４９ｂ、４９ｃ・・・
・発光素子、５０ａ 、５０ｂ 、５０ｃｍ＝受光素子
。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第
４ 図
第 ５ 図
Ｐ
第６図
第７図
第８図
第９図Figure 1 is a side cross-sectional view of the main parts of a washing machine using a conventional pressure sensor, Figure 2 is a cross-sectional view showing the normally open contact of the conventional pressure sensor in an open state, and Figure 3 is a normally open contact of the conventional pressure sensor. 4 is an enlarged plan view of the main parts of the pressure sensor, FIG. 5 is a diagram showing the relationship between pressure and output of the pressure sensor, and FIG. 6 is a pressure sensor that is an embodiment of the present invention. 7 is a sectional view taken along the line C-B-C in FIG. 6, and FIGS. 8 and 9 are enlarged side views showing the relationship between the light shielding plate and the slit. 34... diaphragm, 45... light shielding plate,
46... Spring, 49a, 49b, 49c...
- Light emitting element, 50a, 50b, 50cm = light receiving element. Name of agent: Patent attorney Toshio Nakao and 1 other person
4 Figure 5 Figure P Figure 6 Figure 7 Figure 8 Figure 9
Claims (4)
と、圧力の変化を機械的変位に変換するダイヤフラムと
、前記発光素子と前記受光素子の間に設けられ前記ダイ
ヤフラムの動作に連動する遮光板と、前記圧力の変化に
対する前記ダイヤフラムの機械的変位比率を決定するバ
ネとを備え、前記圧力が設定圧力の時は前記発光素子か
らの光は全て前記受光素子に到達しない構成としてなる
圧力センサ。(1) A light-emitting element, a light-receiving element that receives light from the light-emitting element, a diaphragm that converts changes in pressure into mechanical displacement, and a diaphragm that is provided between the light-emitting element and the light-receiving element and interlocks with the operation of the diaphragm. The pressure includes a light shielding plate and a spring that determines a mechanical displacement ratio of the diaphragm with respect to a change in the pressure, and when the pressure is a set pressure, all light from the light emitting element does not reach the light receiving element. sensor.
囲第１項記載の圧力センサ。(2) The pressure sensor according to claim 1, wherein there are a plurality of pairs of light emitting elements and light receiving elements.
の範囲第１項記載の圧力センサ。(3) The pressure sensor according to claim 1, wherein there are a plurality of light emitting elements and a single light receiving element.
の範囲第１項記載の圧力センサ。(4) The pressure sensor according to claim 1, wherein there is a single light-emitting element and a plurality of light-receiving elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17851583A JPS6070324A (en) | 1983-09-27 | 1983-09-27 | Pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17851583A JPS6070324A (en) | 1983-09-27 | 1983-09-27 | Pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6070324A true JPS6070324A (en) | 1985-04-22 |
Family
ID=16049818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17851583A Pending JPS6070324A (en) | 1983-09-27 | 1983-09-27 | Pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6070324A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1216653A1 (en) * | 2000-12-18 | 2002-06-26 | Biosense, Inc. | Implantable telemetric medical sensor and method |
| EP1216652A3 (en) * | 2000-12-18 | 2002-12-04 | Biosense, Inc. | Telemetric medical system and method |
| US6652464B2 (en) | 2000-12-18 | 2003-11-25 | Biosense, Inc. | Intracardiac pressure monitoring method |
| US6746404B2 (en) | 2000-12-18 | 2004-06-08 | Biosense, Inc. | Method for anchoring a medical device between tissue |
| US6783499B2 (en) | 2000-12-18 | 2004-08-31 | Biosense, Inc. | Anchoring mechanism for implantable telemetric medical sensor |
-
1983
- 1983-09-27 JP JP17851583A patent/JPS6070324A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1216653A1 (en) * | 2000-12-18 | 2002-06-26 | Biosense, Inc. | Implantable telemetric medical sensor and method |
| JP2002345765A (en) * | 2000-12-18 | 2002-12-03 | Biosense Inc | Implantable remote communication type medical sensor |
| EP1216652A3 (en) * | 2000-12-18 | 2002-12-04 | Biosense, Inc. | Telemetric medical system and method |
| US6638231B2 (en) | 2000-12-18 | 2003-10-28 | Biosense, Inc. | Implantable telemetric medical sensor and method |
| US6652464B2 (en) | 2000-12-18 | 2003-11-25 | Biosense, Inc. | Intracardiac pressure monitoring method |
| US6746404B2 (en) | 2000-12-18 | 2004-06-08 | Biosense, Inc. | Method for anchoring a medical device between tissue |
| US6783499B2 (en) | 2000-12-18 | 2004-08-31 | Biosense, Inc. | Anchoring mechanism for implantable telemetric medical sensor |
| KR100853949B1 (en) * | 2000-12-18 | 2008-08-25 | 바이오센스, 인코포레이티드 | Telemetric Medical System And Method |
| KR100860946B1 (en) * | 2000-12-18 | 2008-09-30 | 바이오센스, 인코포레이티드 | Implantable Telemetric Medical Sensor And Method |
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