JPH0626845Y2 - Liquid concentration sensor - Google Patents
Liquid concentration sensorInfo
- Publication number
- JPH0626845Y2 JPH0626845Y2 JP1989011583U JP1158389U JPH0626845Y2 JP H0626845 Y2 JPH0626845 Y2 JP H0626845Y2 JP 1989011583 U JP1989011583 U JP 1989011583U JP 1158389 U JP1158389 U JP 1158389U JP H0626845 Y2 JPH0626845 Y2 JP H0626845Y2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- light emitting
- light receiving
- emitting element
- concentration sensor
- 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
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- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、例えばエンジンオイルの劣化に伴う不溶解成
分の濃度等を光透過損失の程度によって測定する液体濃
度センサに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a liquid concentration sensor for measuring the concentration of insoluble components due to deterioration of engine oil, for example, by the degree of light transmission loss.
従来、この種の液体濃度の判定方法としては、第６図に
示す吸収セルと光度計を使用するものが提案されている
（出願人の先願に係る実願昭６２−１５９８４１号参
照）。第６図（Ａ）は吸収セルａの構成を示す。吸収セ
ルａは、透明樹脂やガラス材等の透明材を断面長方形の
微小間隙ｅを有する長尺物に成形した後、所定の長さに
切断したものである。第６図（Ｂ）はこの吸収セルａを
用いて液体を吸収する作動を示す図である。吸収セルａ
を液体槽ｂの中に漬けると、液体ｃは毛細管現象によっ
て微小間隙ｅ内に吸収され、吸収セルａを液体槽ｂから
取り出しても液体ｃは微小間隙ｅ内に吸収されたままと
なる。第６図（Ｃ）は吸収セルａを光度計ｄで測定して
いる状態を示す図である。光度計ｄは発光素子と受光素
子を相対向して配置しており、吸収セルａを挿入すると
液体を吸収した微小間隙ｅを隔てた透明板の両側に発光
素子と受光素子が位置するようになっている。そして、
光の透過損失を測定することによって濃度を知るもので
ある（例えばエンジンオイルにおいては、光の透過損失
と不溶解成分濃度とは比例関係にある）。なお、吸収セ
ルａを光度計ｄに挿入するときは、その外表面の液体を
布等で拭き取る必要がある。また、吸収セルａは使い捨
てである。Conventionally, as a method for determining the liquid concentration of this type, a method using an absorption cell and a photometer shown in FIG. 6 has been proposed (see Japanese Patent Application No. 62-159841 of the applicant's earlier application). FIG. 6 (A) shows the structure of the absorption cell a. The absorption cell a is formed by molding a transparent material such as a transparent resin or a glass material into a long product having a minute gap e having a rectangular cross section and then cutting the product into a predetermined length. FIG. 6 (B) is a diagram showing the operation of absorbing the liquid using the absorption cell a. Absorption cell a
When the liquid is immersed in the liquid tank b, the liquid c is absorbed in the minute gap e by the capillary phenomenon, and the liquid c remains absorbed in the minute gap e even when the absorption cell a is taken out from the liquid tank b. FIG. 6 (C) is a diagram showing a state in which the absorption cell a is measured by the photometer d. In the photometer d, the light emitting element and the light receiving element are arranged so as to face each other, and when the absorption cell a is inserted, the light emitting element and the light receiving element are positioned on both sides of the transparent plate separated by the minute gap e that has absorbed the liquid. Has become. And
The concentration is known by measuring the light transmission loss (for example, in engine oil, the light transmission loss and the insoluble component concentration are in a proportional relationship). When the absorption cell a is inserted into the photometer d, it is necessary to wipe off the liquid on its outer surface with a cloth or the like. The absorption cell a is disposable.
従来の技術で説明した吸収セルと光度計を使用する液体
濃度センサにおいては、一旦液体を吸収セルａに吸収さ
せて光度計ｄに装着するという二段階の手順であり、測
定操作が迅速にできないという問題点があった。また、
吸収セルａは使い捨てであり数多く備品として持つ必要
があり、液体槽の形状によってはそのまま漬けることが
難しい場合もあるという問題点があった。さらに、吸収
セルは、押出形成によるか又はスペーサー板を両端に位
置させてその両側に透明板を接着させて製作されるが、
微小間隙を０．３mmより小さくすることは加工上困難性
があり、バラツキが生じやすいという問題点があった。In the liquid concentration sensor using the absorption cell and the photometer described in the related art, the procedure is a two-step procedure in which the liquid is once absorbed by the absorption cell a and then attached to the photometer d, and the measurement operation cannot be performed quickly. There was a problem. Also,
The absorption cell a is disposable and needs to be held as a large number of equipment, and there is a problem that it may be difficult to soak it depending on the shape of the liquid tank. Further, the absorption cell is manufactured by extrusion molding or by arranging spacer plates at both ends and adhering transparent plates to both sides thereof,
There is a problem that making the minute gap smaller than 0.3 mm is difficult in processing and variation is likely to occur.
本考案は、従来の技術の有するこのような問題点に鑑み
てなされたものであり、その目的とするところは、操作
が簡単で繰り返し使用できる高感度の液体濃度センサを
提供することを目的としている。The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a highly sensitive liquid concentration sensor that is easy to operate and can be repeatedly used. There is.
上記目的を達成するために、本考案における液体濃度セ
ンサは、相対向する発光素子と受光素子をこれらの間に
微小間隙を形成した樹脂内に埋設して一体化し、少なく
とも発光素子と受光素子間の樹脂を透明樹脂としてなる
液体濃度センサにおいて、発光素子の駆動回路や受光素
子の増幅回路も前記樹脂内に埋設し、発光素子と駆動回
路からなる発光回路の発光特性及び受光素子と増幅器か
らなる受光回路の受光特性の液体温度による変動を補償
する補償回路を備えたものとし、これらの回路の所要の
リード線を前記樹脂外に取り出せるようにしたものであ
る。In order to achieve the above-mentioned object, the liquid concentration sensor in the present invention is constructed by embedding a light emitting element and a light receiving element which face each other in a resin in which a minute gap is formed between them so as to integrate at least the light emitting element and the light receiving element. In a liquid concentration sensor in which the resin is a transparent resin, the drive circuit of the light emitting element and the amplifier circuit of the light receiving element are also embedded in the resin, and the light emitting characteristics of the light emitting circuit including the light emitting element and the drive circuit and the light receiving element and the amplifier are formed. A compensation circuit for compensating the fluctuation of the light receiving characteristic of the light receiving circuit due to the liquid temperature is provided, and the required lead wires of these circuits can be taken out of the resin.
そして、前記樹脂は、少なくとも発光素子と受光素子間
に設けられる内部樹脂とその外部に設けられる外部樹脂
とからなり、内部樹脂は透明樹脂、外部樹脂は非透明樹
脂とすることが好ましい。The resin preferably includes at least an internal resin provided between the light emitting element and the light receiving element and an external resin provided outside the internal resin. The internal resin is preferably a transparent resin and the external resin is preferably a non-transparent resin.
また、基板をコの字型に切り欠き、コの字型切り欠きの
内面両側に発光素子と受光素子を相対向して取付け、駆
動回路や増幅回路を基板上に取付け、これらを樹脂内に
埋設して一体化するものもある。In addition, the board is cut out in a U shape, the light emitting element and the light receiving element are mounted opposite to each other on both inner surfaces of the U shape notch, the driving circuit and the amplifier circuit are mounted on the board, and these are placed in the resin. Some are buried and integrated.
また、微小間隙の四方が開口していることが好ましい。Further, it is preferable that the minute gaps are open on all four sides.
微小間隙を形成した樹脂内に埋設して一体化された発光
素子と受光素子は、液体槽の液体の光透過損失を直接測
定可能とし、液体のサンプル取りを不要にするように働
く。The light-emitting element and the light-receiving element, which are embedded and integrated in the resin in which the minute gap is formed, allow the light transmission loss of the liquid in the liquid tank to be directly measured, and serve to eliminate the need for sampling the liquid.
そして、樹脂内に埋設された発光素子の駆動回路や受光
素子の増幅回路には、液体温度による発光特性や受光特
性の変動を補償する温度補償回路が設けられているので
測定誤差が少ない。そして、外部樹脂を非透明樹脂とす
ることにより、外乱光の影響をなくし、それに伴う誤差
をなくす。The drive circuit for the light emitting element and the amplifier circuit for the light receiving element, which are embedded in the resin, are provided with a temperature compensating circuit for compensating for variations in the light emitting characteristic and the light receiving characteristic due to the liquid temperature, so that the measurement error is small. Then, by making the external resin a non-transparent resin, the influence of ambient light is eliminated, and the error associated therewith is eliminated.
また、コの字型に切り欠きを有する基板は、発光素子、
受光素子やこれらの回路を取付けて、樹脂内に一体的に
埋設し易くする。Further, the substrate having a U-shaped notch is a light emitting element,
The light receiving element and these circuits are attached to facilitate the integral embedding in the resin.
また、微小間隙の四方の開口は、液体の洗浄又は吸い取
り操作をし易くする。Further, the openings on the four sides of the minute gap facilitate the washing or sucking operation of the liquid.
以下、本考案の実施例を図面を参照しつつ説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第１図は液体濃度センサの正面図、第２は液体濃度セン
サの側面図、第３図は接続コード等と一体化された液体
濃度センサの一例を示す斜視図である。1 is a front view of the liquid concentration sensor, FIG. 2 is a side view of the liquid concentration sensor, and FIG. 3 is a perspective view showing an example of the liquid concentration sensor integrated with a connection cord and the like.
第１図及び第２図において、液体濃度センサは、発光素
子１、受光素子２、発光素子１の駆動回路３、受光素子
２の増幅回路４、基板５及びこれらを一体的に内蔵し微
小間隙９を有する樹脂モールド６から成っている。In FIG. 1 and FIG. 2, the liquid concentration sensor includes a light emitting element 1, a light receiving element 2, a drive circuit 3 of the light emitting element 1, an amplifier circuit 4 of the light receiving element 2, a substrate 5, and a minute gap in which these are integrally incorporated. It consists of a resin mold 6 with 9.
基板５はセラミック等をコの字型の切り欠き７を有する
形状に成形したものである。この切り欠き７の内面両側
７ａ、７ｂに発光素子１と受光素子２が相対向して接着
材等で取付けられる。そして、基板５の上面８に発光素
子１の駆動回路３と受光素子２の増幅回路４が接着材等
で取付けられる。なお、３ａ、４ａはプリント配線、３
ｂ、４ｂはリード線である。このように、基板５に発光
素子１、受光素子２及びこれらの回路３、４を取付けた
状態で樹脂６内に埋設され一体化され、外部にでるのは
リード線３ｂ、４ｂのみとなる。The substrate 5 is made by molding ceramic or the like into a shape having a U-shaped notch 7. The light emitting element 1 and the light receiving element 2 face each other on both inner surfaces 7a and 7b of the notch 7 and are attached to each other with an adhesive or the like. Then, the drive circuit 3 of the light emitting element 1 and the amplifier circuit 4 of the light receiving element 2 are attached to the upper surface 8 of the substrate 5 with an adhesive or the like. 3a and 4a are printed wiring and 3
b and 4b are lead wires. Thus, the light emitting element 1, the light receiving element 2, and the circuits 3 and 4 attached to the substrate 5 are embedded and integrated in the resin 6, and only the lead wires 3b and 4b are exposed to the outside.
発光素子１と受光素子２間の樹脂６には、微小間隙９が
形成されている。この微小間隙９の間隙εは吸収セルの
ように射出成形によるものより小さくすることができ
る。そして、この間隙εは、毛細管現象による液体の吸
い上げのためや、小型化および測定感度向上のためには
小さいほどよいが、対象とする液体の透明度に応じて適
宣選択すればよい。また、この微小間隙９はその上下が
開口しており、その前後においても面取り１０と孔１１
によって開口している。したがって、液体槽中へ直接浸
漬する場合は、面取り１０が、また試料採取棒によって
試料液を採取する場合は、孔１１が微小間隙９内への液
体の吸収を容易にする。さらに、孔１１は微小間隙９の
底部にストレスが集中するのを緩和し、クラックの発生
を防止する。また、アルコール等の適宣の洗浄剤に浸漬
するだけで再使用が可能となり、吸い取り紙やエアーノ
ズル等によっても、容易に微小間隙９の液体を取り除い
て清掃することができる。なお、このような微小間隙９
の製造方法としては、切削等の機械加工によって加工す
る方法、金型内の中子によって成形する方法等がある。A minute gap 9 is formed in the resin 6 between the light emitting element 1 and the light receiving element 2. The gap ε of the minute gap 9 can be made smaller than that formed by injection molding like an absorption cell. The gap ε is preferably as small as possible for sucking up the liquid due to the capillarity, for downsizing and for improving the measurement sensitivity, but may be appropriately selected according to the transparency of the target liquid. The minute gap 9 is open at the top and bottom, and the chamfer 10 and the hole 11 are formed before and after the gap.
Is open by. Therefore, the chamfer 10 facilitates the absorption of the liquid into the minute gap 9 when directly immersed in the liquid bath, and the hole 11 when the sample liquid is collected by the sampling rod. Furthermore, the holes 11 relieve the concentration of stress on the bottom of the minute gap 9 and prevent the occurrence of cracks. Further, it can be reused simply by immersing it in an appropriate cleaning agent such as alcohol, and the liquid in the minute gap 9 can be easily removed and cleaned even with a sucking paper, an air nozzle or the like. In addition, such a minute gap 9
Examples of the manufacturing method include a method of machining by machining such as cutting, a method of molding with a core in a mold, and the like.
樹脂６は、光透過のために、少なくとも発光素子１と受
光素子２間においては、透明樹脂１２とする必要があ
る。第１図の例では加工上の便から発光素子１と受光素
子２間だけでなく、その周囲も透明樹脂１２としてい
る。なお、外光の影響を無視できる使用状態のものは全
体を透明樹脂１２とすることも可能である。このような
透明樹脂１２としては、エポキシ樹脂、アリルジグリコ
ールカーボネイト（ＡＤＣ）樹脂（例えば、ユニケム・
シンシティ社製ＲＶＡ７TM）等のように透明性が良く且
つ物理的、化学的特性に優れたものが使用される。そし
て、発光素子１と受光素子２間以外の樹脂は非透明樹脂
１３でよい。外光が多い液体の測定にあっては、むしろ
発光素子１と受光素子２間以外の樹脂を非透明樹脂とし
て外乱光の影響を排除する必要がある。このような非透
明樹脂１３としては、物理的、化学的特性に優れ、成形
加工性と非透明性も良い樹脂が選定される。例えば、カ
ーボンブラックを適量混合したエポキシ樹脂が用いられ
る。Since the resin 6 transmits light, it is necessary to use the transparent resin 12 at least between the light emitting element 1 and the light receiving element 2. In the example of FIG. 1, the transparent resin 12 is used not only between the light emitting element 1 and the light receiving element 2 but also around the light emitting element 1 for convenience of processing. It should be noted that it is possible to use the transparent resin 12 as a whole in a used state in which the influence of external light can be ignored. As such a transparent resin 12, an epoxy resin, an allyl diglycol carbonate (ADC) resin (for example, Unichem.
Those having good transparency and excellent physical and chemical characteristics such as RVA7 ™ manufactured by Sin City Co., Ltd. are used. The resin other than between the light emitting element 1 and the light receiving element 2 may be the non-transparent resin 13. In the measurement of a liquid containing a large amount of external light, it is rather necessary to use a resin other than between the light emitting element 1 and the light receiving element 2 as a non-transparent resin to eliminate the influence of ambient light. As such a non-transparent resin 13, a resin having excellent physical and chemical characteristics, moldability and non-transparency is selected. For example, an epoxy resin in which carbon black is mixed in an appropriate amount is used.
第３図は、第１図及び第２図で説明した液体濃度センサ
を、センサヘッド１４、リード線３ｂ、４ｂを被覆する
接続コード１５及び測定器本体への取付キャップ１６と
してまとめたものである。センサヘッド１４は１０mm前
後に小型化されており、接続コード１５とほぼ同じ径と
なっている。接続コード１５に適度の可撓性を持たせる
と複雑な形状の液体槽にも挿入可能となる。FIG. 3 shows the liquid concentration sensor described with reference to FIGS. 1 and 2 as a sensor head 14, a connecting cord 15 for covering the lead wires 3b and 4b, and a cap 16 attached to the measuring device body. . The sensor head 14 is downsized to about 10 mm and has a diameter substantially the same as the connection cord 15. If the connection cord 15 is provided with appropriate flexibility, it can be inserted into a liquid tank having a complicated shape.
第４図は発光素子１と駆動回路３からなる発光回路の一
例を示す回路図である。発光素子１は入力電圧Ｖｃｃの
印加を受けて発光するが、周囲温度特に液体の温度の影
響を受ける。そこで、サーミスタＲTHとトランジスタＴ
ｒによる電圧ＶBEの温度特性を利用した温度補償回路と
なっている。FIG. 4 is a circuit diagram showing an example of a light emitting circuit including the light emitting element 1 and the driving circuit 3. The light emitting element 1 emits light upon receiving the input voltage Vcc, but is affected by the ambient temperature, particularly the temperature of the liquid. Therefore, the thermistor R TH and the transistor T
It is a temperature compensation circuit that utilizes the temperature characteristics of the voltage V BE due to r .
第５図は受光素子２と増幅回路４からなる受光回路の一
例を示す回路図である。受光素子２の出力はアンプＡ１
で増幅されるが、このアンプＡ１が周囲温度特に液体の
温度の影響を受ける。そこで、サーミスタＲTHと抵抗Ｒ
１を並列接続するアンプＡ２によって温度補償する回路
となっている。第４図及び第５図に示すように、発光素
子１の駆動回路３と受光素子２の増幅回路４も一体に埋
設し、温度補償可能とした液体濃度センサにあっては、
液体の温度に係わらず正確な濃度を簡単な回路構成で測
定可能である。FIG. 5 is a circuit diagram showing an example of a light receiving circuit composed of the light receiving element 2 and the amplifier circuit 4. The output of the light receiving element 2 is the amplifier A 1
The amplifier A 1 is affected by the ambient temperature, especially the temperature of the liquid. Therefore, the thermistor R TH and the resistance R
It is a circuit for temperature compensation by an amplifier A 2 in which 1 is connected in parallel. As shown in FIGS. 4 and 5, in the liquid concentration sensor in which the drive circuit 3 of the light emitting element 1 and the amplifier circuit 4 of the light receiving element 2 are also integrally embedded and temperature compensation is possible,
Accurate concentration can be measured with a simple circuit configuration regardless of the temperature of the liquid.
つぎに、上述した構成の液体濃度センサの作動を第１図
乃至第３図に基づいて説明する。Next, the operation of the liquid concentration sensor having the above configuration will be described with reference to FIGS. 1 to 3.
第３図の液体濃度センサにおいて、取付キャップ１６を
図示されない測定器本体（電源及び出力電圧を測定し光
損失（ｄＢ）又は液体濃度等に変換し記録し表示する装
置を内蔵する）に接続する。そして、接続コード１５を
操作してセンサヘッド１４を測定したい液体に漬ける。
すると、液体の濃度に応じた光透過損失が発生しその程
度を測定器本体で処理して濃度を知る。測定後は、セン
サヘッド１４を清掃すれば何回でも再使用が可能であ
る。In the liquid concentration sensor of FIG. 3, the mounting cap 16 is connected to a measuring device main body (not shown) (which has a built-in device for measuring the power supply and output voltage, converting to optical loss (dB) or liquid concentration, and recording and displaying). . Then, the connection cord 15 is operated to immerse the sensor head 14 in the liquid to be measured.
Then, a light transmission loss corresponding to the concentration of the liquid is generated, and the degree is measured by the measuring instrument main body to know the concentration. After the measurement, the sensor head 14 can be reused any number of times by cleaning it.
本考案は、上述したように構成されているので以下に記
載する効果を奏する。Since the present invention is configured as described above, it has the following effects.
発光素子と受光素子を微小間隙を形成する樹脂内に埋設
して一体化し、少なくとも発光素子と受光素子間の樹脂
を透明樹脂とし、液体の光透過損失を直接測定可能とし
たので、サンプリングが不要となり簡単な操作で濃度が
測定できる。また、微小間隙の形成についても、切削等
の機械加工による方法、金型内の中子によって形成する
方法等により容易に微小間隙を形成できるので、高感度
の濃度センサを製作することができる。Since the light emitting element and the light receiving element are embedded and integrated in a resin that forms a minute gap, and at least the resin between the light emitting element and the light receiving element is a transparent resin, the light transmission loss of the liquid can be directly measured, so sampling is not required. The concentration can be measured with a simple operation. Also, regarding the formation of the minute gaps, the minute gaps can be easily formed by a method such as a machining method such as cutting, a method of forming by a core in a mold, etc., so that a highly sensitive concentration sensor can be manufactured.
そして、温度補償回路を備えた発光素子の駆動回路や受
光素子の増幅回路も樹脂内に埋設し、これらの回路のリ
ード線を取り出せるようにしたので、液体にセンサヘッ
ドを漬けるだけで温度補償もでき、正確に測定できる。The drive circuit of the light emitting element and the amplification circuit of the light receiving element, which are equipped with a temperature compensation circuit, are also embedded in the resin so that the leads of these circuits can be taken out. Yes, it can be measured accurately.
さらに、外部樹脂を非透明樹脂とすることにより、外乱
光の影響をなくし、それに伴う誤差をなくすことができ
る。Furthermore, by making the external resin a non-transparent resin, it is possible to eliminate the influence of ambient light and to eliminate the error associated therewith.
また、基板をコの字型に切り欠き、コの字型切り欠きの
内面両側に発光素子と受光素子を相対向して取付け、駆
動回路や増幅回路を基板上に取付け、これらを樹脂内に
埋設して一体化すると、位置決めが確実となって効率よ
くセンサヘッドの製作ができる。In addition, the board is cut out in a U shape, the light emitting element and the light receiving element are mounted opposite to each other on both inner surfaces of the U shape notch, the driving circuit and the amplifier circuit are mounted on the board, and these are placed in the resin. When embedded and integrated, positioning is ensured and the sensor head can be manufactured efficiently.
また、微小間隙の四方が開口しており、清掃が容易であ
るので、再使用のための手間が少ない。Further, since the minute gaps are opened on all four sides and cleaning is easy, there is little labor for reuse.
第１図は液体濃度センサの正面図、第２図は液体濃度セ
ンサの側面図、第３図は接続コード等と一体化された液
体濃度センサの一例を示す斜視図、第４図は発光素子の
駆動回路の一例を示す回路図、第５図は受光素子の増幅
回路の一例を示す回路図、第６図は従来の液体濃度セン
サを示す図である。なお、図中の主な符号は下記の通り
である。 １……発光素子 ２……受光素子 ３……駆動回路 ４……増幅回路 ４ａ、４ｂ……リード線 ５……基板 ６……樹脂 ７……コの字型の切り欠き ９……微小間隙 １２……透明樹脂 １３……非透明樹脂FIG. 1 is a front view of the liquid concentration sensor, FIG. 2 is a side view of the liquid concentration sensor, FIG. 3 is a perspective view showing an example of the liquid concentration sensor integrated with a connection cord, and FIG. 4 is a light emitting element. 5 is a circuit diagram showing an example of the drive circuit of FIG. 5, FIG. 5 is a circuit diagram showing an example of an amplifier circuit of the light receiving element, and FIG. 6 is a diagram showing a conventional liquid concentration sensor. The main symbols in the figure are as follows. 1 ... Light emitting element 2 ... Light receiving element 3 ... Driving circuit 4 ... Amplifying circuit 4a, 4b ... Lead wire 5 ... Substrate 6 ... Resin 7 ... U-shaped notch 9 ... Minute gap 12: Transparent resin 13: Non-transparent resin
───────────────────────────────────────────────────── フロントページの続き (72)考案者 石原 章博 大阪府東大阪市岩田町２丁目３番１号 タ ツタ電線株式会社内 (56)参考文献 特開 昭57−51296（ＪＰ，Ａ) 特開 昭47−1848（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiro Ishihara 2-3-1, Iwata-cho, Higashi-Osaka City, Osaka Prefecture Tatsuta Electric Wire Co., Ltd. (56) References JP-A-57-51296 (JP, A) Kai 47-1848 (JP, A)
Claims (4)
間に微小間隙を形成した樹脂内に埋設して一体化し、少
なくとも発光素子と受光素子間の樹脂を透明樹脂として
なる液体濃度センサにおいて、発光素子の駆動回路及び
受光素子の増幅回路も前記樹脂内に埋設し、発光素子と
駆動回路からなる発光回路の発光特性及び受光素子と増
幅器からなる受光回路の受光特性の液体温度による変動
を補償する補償回路を備えたものとし、これらの回路の
所要のリード線を前記樹脂外に取り出せるようにしたこ
とを特徴とする液体濃度センサ。1. A liquid concentration sensor in which a light emitting element and a light receiving element facing each other are embedded and integrated in a resin having a minute gap formed therebetween, and at least the resin between the light emitting element and the light receiving element is a transparent resin. The drive circuit of the light emitting element and the amplifying circuit of the light receiving element are also embedded in the resin, and the fluctuation of the light emitting characteristics of the light emitting circuit including the light emitting element and the driving circuit and the light receiving characteristic of the light receiving circuit including the light receiving element and the amplifier due to the liquid temperature are prevented A liquid concentration sensor, comprising a compensation circuit for compensation, wherein required lead wires of these circuits can be taken out of the resin.
に設けられる内部樹脂とその外部に設けられる外部樹脂
とからなり、内部樹脂は透明樹脂、外部樹脂は非透明樹
脂とした請求項１記載の液体濃度センサ。2. The resin comprises at least an internal resin provided between a light emitting element and a light receiving element and an external resin provided outside thereof, wherein the internal resin is a transparent resin and the external resin is a non-transparent resin. Liquid concentration sensor.
欠きの内面両側に発光素子と受光素子を相対向して取付
け、駆動回路や増幅回路を基板上に取付け、これらを樹
脂内に埋設して一体化した請求項１又は２記載の液体濃
度センサ。3. A board is cut out in a U-shape, a light emitting element and a light receiving element are mounted on both sides of the inner surface of the U-shaped cutout so as to face each other, and a drive circuit and an amplifier circuit are mounted on the board. The liquid concentration sensor according to claim 1, wherein the liquid concentration sensor is embedded and integrated in a resin.
至３記載の液体濃度センサ。4. A liquid concentration sensor according to claim 1, wherein the minute gaps are open on all sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989011583U JPH0626845Y2 (en) | 1989-01-31 | 1989-01-31 | Liquid concentration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989011583U JPH0626845Y2 (en) | 1989-01-31 | 1989-01-31 | Liquid concentration sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02103254U JPH02103254U (en) | 1990-08-16 |
| JPH0626845Y2 true JPH0626845Y2 (en) | 1994-07-20 |
Family
ID=31220268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989011583U Expired - Lifetime JPH0626845Y2 (en) | 1989-01-31 | 1989-01-31 | Liquid concentration sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0626845Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938829A (en) * | 2015-03-02 | 2016-09-14 | 株式会社东芝 | Optical coupling device and insulating device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499852A (en) * | 1980-07-15 | 1985-02-19 | Shipley Company Inc. | Apparatus for regulating plating solution in a plating bath |
-
1989
- 1989-01-31 JP JP1989011583U patent/JPH0626845Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938829A (en) * | 2015-03-02 | 2016-09-14 | 株式会社东芝 | Optical coupling device and insulating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02103254U (en) | 1990-08-16 |
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