JPH05133884A - Detecting device of degradation of oil - Google Patents

Detecting device of degradation of oil

Info

Publication number
JPH05133884A
JPH05133884A JP29434591A JP29434591A JPH05133884A JP H05133884 A JPH05133884 A JP H05133884A JP 29434591 A JP29434591 A JP 29434591A JP 29434591 A JP29434591 A JP 29434591A JP H05133884 A JPH05133884 A JP H05133884A
Authority
JP
Japan
Prior art keywords
light
oil
condenser lens
light emitting
holder unit
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
JP29434591A
Other languages
Japanese (ja)
Inventor
Katsuhiko Fujiwara
克彦 藤原
Ichiro Oikawa
一郎 及川
Yoshitsugu Kono
義次 河野
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.)
Ricoh Optical Industries Co Ltd
Original Assignee
Ricoh Optical Industries 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 Ricoh Optical Industries Co Ltd filed Critical Ricoh Optical Industries Co Ltd
Priority to JP29434591A priority Critical patent/JPH05133884A/en
Publication of JPH05133884A publication Critical patent/JPH05133884A/en
Pending legal-status Critical Current

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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To increase the precision in detection of degradation of oil and to indicate the exact time of replacement of the oil for a driver by increasing the efficiency in utilization of a light from a light-emitting part and a transmitted light and by obtaining an output of excellent S/N ratio from a light-sensing part. CONSTITUTION:An infrared emitting part 1, an oil holder unit 3 which holds oil 4 to be inspected and is disposed so that the light from the emitting part is transmitted through this oil, a photodetector part 7 which receives the light transmitted through the unit 3 and outputs an electric signal corresponding to the quantity of the light received, a band-pass filter 2 which transmits only the light having a wave number of about 1630<-1> and is disposed just behind the light-emitting part, a condenser lens 6 disposed between the light-emitting part and the oil holder unit 3, and a reflecting member 10 disposed at a position behind the light-emitting part, are provided. The oil holder unit 3 is constructed of a window member holding the oil to be inspected inside, and the lens 6 is provided at a position whereat a distance from the light-emitting part to the front-side principal point of the lens 6 is longer than a distance from the rear-side principal point thereof to the photodetecting part.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、自動車のエンジンオ
イル等の劣化を正確に検出し、オイル交換の適切な時期
をドライバーに知らせるためのオイル劣化検知装置に関
するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil deterioration detecting device for accurately detecting deterioration of engine oil of an automobile and informing a driver of an appropriate time for oil replacement.

【0002】[0002]

【従来の技術】自動車等の、たとえばエンジンオイル
は、エンジンの使用時間に比例して劣化が進行し、劣化
がある程度以上に達するとエンジンの損傷を引き起こす
ため、その状態に達する前に新しいエンジンオイルと交
換しなければならない。このエンジンオイルの交換時期
を知る目安として、走行距離の長さが挙げられるが、ア
イドリングを長めに使用し続けた場合や、エアコンを作
動させたまま走行し続けた場合等は、走行距離が少ない
割にはエンジンオイルの劣化がかなり進んでいることが
あるので、走行距離だけを目安にすると、交換時期が不
正確になり、危険である。
2. Description of the Related Art Deterioration of engine oil for automobiles, for example, progresses in proportion to the operating time of the engine, and if the deterioration reaches a certain level or more, engine damage occurs. Must be exchanged. The mileage can be mentioned as a guide for knowing when to change the engine oil, but the mileage is small when the idling is continued for a long time or when the air conditioner is kept running. The engine oil may have deteriorated considerably, so if you use only the mileage as a guide, the replacement time will be inaccurate and dangerous.

【0003】また、直接エンジンオイルの状態から交換
時期を知る方法として、エンジン内に挿入してあるオイ
ルゲージに付着したオイルの色、粘度等を使用者が調べ
る方法があるが、見た目や手触り等に頼る感覚的な判断
能力が要求されるため、人によって判断の差異が大き
く、加えて、エンジンオイルを実際に手に取ってみた経
験のほとんどない一般のドライバーにとっては感と経験
を要することであって、これは容易にできることではな
い。
As a method of knowing the replacement time directly from the state of the engine oil, there is a method in which the user checks the color, viscosity, etc. of the oil adhering to the oil gauge inserted in the engine. Because it requires a sensory judgment ability that relies on the engine, there is a large difference in judgment depending on the person, and in addition, it requires feeling and experience for a general driver who has little experience of actually picking up engine oil. Well, this is not an easy thing to do.

【0004】そこで、上述した方法に代わる手段とし
て、特定の光のオイルに対する透過率がオイル劣化に伴
って変化する特性を利用したオイル劣化検知装置が考案
されている。この光を利用したオイル劣化検知装置で初
期に考案されたものは可視光を用いていた。しかし、可
視光はオイルそのものに吸収され易いため、オイル劣化
の初期の段階から光の透過率がかなり低下してしまう。
このため、その後のオイル劣化に対応した透過率の変化
は初期の変化に比較して微小なものとなり、オイル劣化
検知の精度が低下してしまう。
Therefore, as an alternative to the above-described method, an oil deterioration detecting device has been devised which utilizes the characteristic that the transmittance of specific light with respect to the oil changes with the oil deterioration. An oil deterioration detecting device using this light, which was initially devised, used visible light. However, since visible light is easily absorbed by the oil itself, the light transmittance is considerably reduced from the initial stage of oil deterioration.
For this reason, the change in the transmittance corresponding to the subsequent oil deterioration becomes minute compared to the initial change, and the accuracy of oil deterioration detection decreases.

【0005】そこで、近年では、可視光に代わって赤外
光が用いられ、オイルそのものの光の透過率ではなく、
オイルの劣化に伴って生成される物質による光の吸収に
起因する透過率の変化を検知する方法が考案されてい
る。例えば、特開平3−24438号公報においては、
エンジンオイルが劣化し始めると生成される窒化物(あ
るいは酸化物)は複数の赤外線吸収スペクトルを持つ
が、エンジンオイル中の全窒化物量(あるいは全酸化物
量)は波数1630cm~1近傍における試料オイルの基
準オイルに対する光吸収度変化に略比例することを利用
して、1630cm~1近傍のみの光の透過率に変化を検
知することにより、オイル劣化の度合いを検出する方法
が開示されている。
Therefore, in recent years, infrared light has been used instead of visible light, and not the light transmittance of the oil itself,
A method has been devised to detect a change in transmittance due to absorption of light by a substance generated due to deterioration of oil. For example, in Japanese Patent Laid-Open No. 3-24438,
The nitride (or oxide) generated when the engine oil begins to deteriorate has multiple infrared absorption spectra, but the total amount of nitride (or total oxide) in the engine oil is the same as that of the sample oil near the wave number of 1630 cm- 1. There is disclosed a method of detecting the degree of oil deterioration by detecting the change in the light transmittance only in the vicinity of 1630 cm to 1 by utilizing the fact that it is substantially proportional to the change in light absorption with respect to the reference oil.

【0006】このような光の透過率の変化を利用したエ
ンジンオイル劣化検知装置の基本構成要素は、発光部、
被検オイル(試料オイル)、受光部である。この構成に
おける動作としては、発光部から発した1630cm~1
近傍の波数を持つ赤外光を前記被検オイルに通し、前記
受光部で受光した光の強度を測定することにより、オイ
ルの透過率を検出する。そして、この検出値と、予めエ
ンジンオイルが全く劣化していない状態で同様に測定し
た時の検出値とを比較することにより、劣化の度合いを
判断している。
The basic constituent elements of the engine oil deterioration detecting device utilizing such a change in light transmittance are a light emitting portion,
The test oil (sample oil) and the light receiving part. The operation in this configuration is 1630 cm to 1 emitted from the light emitting unit.
The transmittance of the oil is detected by passing infrared light having a wave number in the vicinity through the oil to be measured and measuring the intensity of the light received by the light receiving section. Then, the degree of deterioration is judged by comparing this detected value with the detected value obtained by the same measurement in advance in a state where the engine oil has not deteriorated at all.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、上記従
来のオイル劣化検知装置においては、赤外光等の光に対
するオイルの透過率は、オイルに全く劣化のない状態で
も、それほど高くはないため、受光部で受光する光の強
度が弱く、その出力は微弱になりがちである。このた
め、受光部からの出力が伝達される過程において電気的
ノイズが加わった場合等、出力のS/N比がいよいよ小
さくなり、オイル劣化の検出精度が悪くなってしまうと
いう問題点があった。
However, in the above-described conventional oil deterioration detecting device, the transmittance of the oil with respect to light such as infrared light is not so high even when the oil is not deteriorated at all. The intensity of the light received by the section is weak, and its output tends to be weak. For this reason, when electrical noise is added in the process of transmitting the output from the light receiving unit, the S / N ratio of the output is further reduced, and the detection accuracy of oil deterioration is deteriorated. ..

【0008】また、この受光部からの出力のS/N比を
改良するために、発光部の出力を大きくすることによっ
て受光部から大きな出力を得ようとすると、発光部及び
その周辺部分から伝わる熱量が像かするため、この影響
で受光部周辺の雰囲気温度が上昇して受光部の作動が不
安定になり、意に反してS/N比が小さくなってしまう
という問題点があった。そこで、この発明は上述した従
来の問題点を解消して、発光部から発する光の利用効率
が高く、受光部において充分な強度の光が受光され、オ
イル劣化の検出を安定して、高精度に行なうことのでき
るオイル劣化検出装置を提供することを課題としてい
る。
Further, in order to improve the S / N ratio of the output from the light receiving portion, if an attempt is made to obtain a large output from the light receiving portion by increasing the output of the light emitting portion, it is transmitted from the light emitting portion and its peripheral portion. Since there is an image of the amount of heat, there is a problem that the ambient temperature around the light receiving portion rises due to this effect, the operation of the light receiving portion becomes unstable, and the S / N ratio becomes smaller than expected. Therefore, the present invention solves the above-mentioned problems of the related art, has high utilization efficiency of light emitted from the light emitting portion, receives light of sufficient intensity in the light receiving portion, stabilizes oil deterioration detection, and has high accuracy. It is an object of the present invention to provide an oil deterioration detection device that can be used for the above.

【0009】[0009]

【課題を解決するための手段】この発明の要旨とすると
ころは、赤外線を発光する発光部と、被検オイルを収容
し前記発光部から射出された光がこの被検オイルを透過
するように配置されたオイルホルダーユニットと、この
オイルホルダーユニットから射出した光を受光し、その
受光量に応じた電気信号を出力する受光部とを備えたオ
イル劣化装置において、前記発光部と前記オイルホルダ
ーユニットの間にあって、発光部の直後位置に波数16
30cm~1近傍の光のみ透過するバンドパスフィルター
を配置し、且つ前記受光部の直前位置に、前記オイルホ
ルダーユニットから射出した光を受光部に集光するため
のコンデンサーレンズを配置しており、このコンデンサ
ーレンズは、光軸方向に所定の厚さを有する前記被検オ
イルを内部に収容するウインドー部材から成り、このウ
インドー部材の光の入射側と射出側の面の内、少なくと
も1つの面を雰囲気側に凹な曲面に設けたことにある。
DISCLOSURE OF THE INVENTION The gist of the present invention is to provide a light emitting section for emitting infrared rays and a light to be emitted from the light emitting section, which contains the oil to be measured. An oil deterioration device comprising an arranged oil holder unit and a light receiving unit for receiving light emitted from the oil holder unit and outputting an electric signal according to the received light amount, wherein the light emitting unit and the oil holder unit are provided. And the wave number of 16
A bandpass filter that transmits only light in the vicinity of 30 cm to 1 is arranged, and a condenser lens for condensing the light emitted from the oil holder unit to the light receiving unit is arranged in front of the light receiving unit. This condenser lens is composed of a window member which accommodates the oil to be measured having a predetermined thickness in the optical axis direction, and at least one of the light incident side surface and the light emitting side surface of the window member is provided. The reason is that it is provided on a curved surface that is concave on the atmosphere side.

【0010】[0010]

【作用】したがって、請求項1では、バンドパスフィル
ターによって波数1630cm~1近傍の光のみが透過さ
れるので、受光部やその近傍部材が暖められるのを防止
することになる。又コンデンサーレンズによってオイル
ホルダーユニットを射出した光が受光部に高効率で集光
される。また、請求項2では、反射部材によって、コン
デンサーレンズの開口からそれた方向に発せられた光
を、コンデンサーレンズの方向に反射するので、光の利
用効率が高まる。また、請求項3では、コンデンサーレ
ンズの配置位置により、発光部を物体面、受光部を像面
とするコンデンサーレンズによる光学系の倍率が等倍よ
りも小さくなるので、像面の光強度、及び受光部からの
出力を上げることができる。また、請求項4では、被検
オイルの厚さを0.05mm以上1.0mm以下とする
ことにより、オイルの流通を滑らかに保ったまま、オイ
ルによる光の吸収を小さく抑えることができるものであ
る。
Therefore, in the present invention, since only the light having a wave number of about 1630 cm- 1 is transmitted by the bandpass filter, it is possible to prevent the light receiving portion and its neighboring members from being heated. Further, the light emitted from the oil holder unit is condensed by the condenser lens at the light receiving portion with high efficiency. Further, in claim 2, the light emitted from the condenser lens in the direction deviating from the opening of the condenser lens is reflected in the direction of the condenser lens, so that the light utilization efficiency is improved. Further, according to claim 3, the magnification of the optical system by the condenser lens having the light emitting portion as the object surface and the light receiving portion as the image surface becomes smaller than 1 × depending on the arrangement position of the condenser lens. The output from the light receiving section can be increased. Further, in claim 4, by setting the thickness of the test oil to be 0.05 mm or more and 1.0 mm or less, it is possible to suppress the absorption of light by the oil to be small while keeping the oil flow smoothly. is there.

【0011】[0011]

【実施例】以下、この発明の実施例を図面を参照して説
明する。図1において、装置ケース11内に、波数16
30cm~1の光を含む赤外光を発する発光部1が配置さ
れ、この発光部1の背後位置に、光の利用効率を高める
ための反射部材10が設けられている。そして、発光部
1の発光面に対して垂直方向に射出される光の光路(光
軸13)上に、波数1630cm~1近傍の光のみを透過
するバンドパスフィルター2、エンジンオイル(被検オ
イル)が収容されているオイルホルダーユニット3、オ
イルホルダーユニット3を通過した光を集光するための
コンデンサーレンズ6、コンデンサーレンズ6によって
集光された光を受光する受光部7がそれぞれ配置されて
いる。このオイルホルダーユニット3は、被検オイル4
と、被検オイル4を真中に挾んだ形で収容した。ウイン
ドー部材5、このウインドー部材5内に被検オイル4を
導くためのオイル誘導管8、及びウインドー部材5を支
持するためのウインドー支持台9等から構成されてい
る。また、コンデンサーレンズ6は、発光部7からコン
デンサーレンズ6の前側主点Hまでの距離hが、同後側
主点H’から受光部7までの距離h’より長くなるよう
な位置に配置されている。さらに、受光部7には、受光
部7からの出力信号を処理するデータ処理部12が電気
的に接続されている。
Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a wave number of 16
A light emitting unit 1 that emits infrared light including light of 30 cm to 1 is arranged, and a reflecting member 10 for increasing the light utilization efficiency is provided behind the light emitting unit 1. Then, on the optical path (optical axis 13) of the light emitted in the direction perpendicular to the light emitting surface of the light emitting unit 1, the band pass filter 2 that transmits only the light having a wave number of about 1630 cm to 1 and the engine oil (the test oil ) Is accommodated, a condenser lens 6 for condensing the light passing through the oil holder unit 3, and a light receiving portion 7 for receiving the light condensed by the condenser lens 6 are arranged. .. This oil holder unit 3 is used to measure the oil 4
Then, the oil 4 to be tested was housed in a state of being sandwiched in the middle. The window member 5 includes an oil guide pipe 8 for guiding the oil 4 to be measured into the window member 5, a window support 9 for supporting the window member 5, and the like. The condenser lens 6 is arranged at a position such that the distance h from the light emitting portion 7 to the front principal point H of the condenser lens 6 is longer than the distance h ′ from the rear principal point H ′ to the light receiving portion 7. ing. Further, a data processing unit 12 that processes an output signal from the light receiving unit 7 is electrically connected to the light receiving unit 7.

【0012】上記構成において、リアルタイムでの連続
的な劣化検知を可能にするため、図示しないエンジン内
の本来のエンジンオイルの流通経路からオイル誘導管8
でエンジンオイルの一部をオイルホルダーユニット3内
へ誘導し、ウインドー部材5内に流し込む。そして、発
光部1は波数1630cm~1の光を含む赤外光を発光
し、バンドパスフィルター2がこの光の内、波数163
0cm~1近傍以外の光を遮断し、波数1630cm~1
傍の光のみをオイルホルダーユニット3のウインドー部
材5へ入射させる。このウインドー部剤5を透過してコ
ンデンサーレンズ6に入射する光はウインドー部材5に
よる吸収、被検オイルそのものによる吸収、オイル劣化
によって発生した窒化物による吸収等により光量は減少
していて、この光はコンデンサーレンズ6により、受光
部7に集光される。この受光部7に取り込まれた光は信
号出力に変換され、信号出力はデータ処理部12へ入力
される。データ処理部12では、信号出力のデータをエ
ンジンニオイルの劣化が全くない状態、即ち、新しいオ
イルをエンジンに入れた直後の前記信号出力のデータを
比較するか、あるいは、予め交換を必要とする劣化状態
での信号出力が算出されている場合は、信号出力の絶対
値から、エンジンオイル劣化の度合いを判断する。そし
て、この判断に応じてデータ処理部12はエンジンオイ
ルの交換が必要か否かをドライバーに表示する。
In the above structure, in order to enable continuous deterioration detection in real time, the oil guide pipe 8 is provided from the original engine oil flow path in the engine (not shown).
Then, a part of the engine oil is guided into the oil holder unit 3 and poured into the window member 5. Then, the light emitting section 1 emits infrared light including light having a wave number of 1630 cm to 1 , and the band pass filter 2 has a wave number of 163 out of the light.
Light other than around 0 cm to 1 is blocked, and only light near the wave number of 1630 cm to 1 is made incident on the window member 5 of the oil holder unit 3. The light transmitted through the window member 5 and incident on the condenser lens 6 has a reduced light amount due to absorption by the window member 5, absorption by the oil to be measured, absorption by the nitride generated due to oil deterioration, and the like. Is condensed on the light receiving portion 7 by the condenser lens 6. The light captured by the light receiving unit 7 is converted into a signal output, and the signal output is input to the data processing unit 12. The data processing unit 12 compares the signal output data with a state in which there is no deterioration of the engine oil, that is, the signal output data immediately after the new oil is put into the engine is compared, or it is necessary to exchange the data in advance. When the signal output in the deteriorated state is calculated, the degree of engine oil deterioration is determined from the absolute value of the signal output. Then, according to this determination, the data processing unit 12 displays to the driver whether or not the engine oil needs to be changed.

【0013】ところで、上記動作において、バンドパス
フィルター2によって波数1630cm~1近傍以外の光
を発光部1に近い所、即ち受光部7から遠い所で遮断す
ることにより、受光部7及び、受光部7周辺の保持部材
等が赤外線そのもの、あるいは赤外線をうけた部材から
つたわる熱によって暖められる現象を最小限に抑えてい
る。また、発光部1からコンデンサーレンズ6の前側主
点Hまでの距離hを、同後側主点H’から受光部7まで
の距離h’より長くすることにより、発光部1を物体
面、受光部7を像面とするコンデンサーレンズ6による
光学系の倍率を等倍よりも小さくしている。
By the way, in the above operation, the bandpass filter 2 blocks light other than near the wave number of 1630 cm to 1 at a place near the light emitting unit 1, that is, at a place far from the light receiving unit 7, whereby the light receiving units 7 and 7 are received. The phenomenon that the holding members around 7 are heated by the infrared rays themselves or the heat from the members receiving the infrared rays is minimized. Further, by making the distance h from the light emitting unit 1 to the front principal point H of the condenser lens 6 longer than the distance h ′ from the rear principal point H ′ to the light receiving unit 7, the light emitting unit 1 can receive light from the object plane and the light receiving unit. The magnification of the optical system by the condenser lens 6 having the portion 7 as the image plane is set to be smaller than the unity magnification.

【0014】また、発光部1の背後位置に設けた反射部
材10は発光部1から発し、直接コンデンサーレンズ6
に入射して受光部7に達する光以外の光、即ち、コンデ
ンサーレンズ6の開口からそれた方向に発せられる光を
コンデンサーレンズ6方向へ反射し、より多くの光がコ
ンデンサーレンズ6によって集光されるようにしてい
る。さらに被検オイル4の光軸方向の厚さについては、
厚過ぎると被検オイル4による光の吸収が大きくなり、
結果としてS/N比を悪くしてしまう。逆に薄過ぎて
も、ウインドー部材5に被検オイル4の不純物等が付着
し、被検オイル4の流れの円滑度が悪くなる。そこで、
被検オイル4の光軸方向の厚さを0.05mm以上1.
0mm以下に設定することにより、オイルの流通を滑ら
かに保った状態で、オイルにより光の吸収が小さく抑え
られるようにしている。
A reflecting member 10 provided behind the light emitting portion 1 is emitted from the light emitting portion 1 and directly connected to the condenser lens 6.
The light other than the light that has entered the light-receiving portion 7 and reaches the light-receiving portion 7, that is, the light emitted in the direction deviating from the opening of the condenser lens 6 is reflected toward the condenser lens 6 and more light is condensed by the condenser lens 6. I am trying to do it. Furthermore, regarding the thickness of the test oil 4 in the optical axis direction,
If it is too thick, the absorption of light by the test oil 4 will increase,
As a result, the S / N ratio is deteriorated. Conversely, if it is too thin, impurities or the like of the oil 4 to be measured adhere to the window member 5, and the smoothness of the flow of the oil 4 to be measured deteriorates. Therefore,
The thickness of the test oil 4 in the optical axis direction is 0.05 mm or more.
By setting it to 0 mm or less, the absorption of light is suppressed to be small by the oil while keeping the oil flow smoothly.

【0015】[0015]

【発明の効果】以上説明したように、請求項1によれ
ば、発光部の直後に波数1630cm~1近傍の光のみを
透過するバンドパスフィルターを、又受光部の地欲前位
置にコンデンサーレンズを配置したので、受光部や受光
部周辺の保持部材等が赤外線等によって暖まるのを極力
抑えることができ、受光部の安定した動作を保持するこ
とができる。又、受光部に取り込まれる光の利用効率を
高めることでき、オイル劣化の検出精度を高めることが
できる。また、請求項2によれば、発光部の背後位置に
反射部材を配置したので、コンデンサーレンズに直接入
射する光以外の光もコンデンサーレンズに集められ、光
の利用効率を高めることができ、オイル劣化の検出精度
を高めることができる。
As described above, according to the first aspect of the present invention, the bandpass filter which transmits only the light having a wave number of about 1630 cm to 1 is provided immediately after the light emitting portion, and the condenser lens is provided at the pre-greed position of the light receiving portion. Since the light receiving section and the holding member around the light receiving section are prevented from being heated by infrared rays or the like as much as possible, the stable operation of the light receiving section can be maintained. In addition, it is possible to improve the utilization efficiency of the light that is taken into the light receiving portion, and it is possible to improve the detection accuracy of oil deterioration. Further, according to the second aspect, since the reflecting member is arranged behind the light emitting portion, light other than the light directly incident on the condenser lens is collected in the condenser lens, and the light utilization efficiency can be improved, and the oil can be used. It is possible to improve the accuracy of deterioration detection.

【0016】また、請求項3によれば、発光部からコン
デンサーレンズの前側主点までの距離を、同後側主点か
ら受光部までの距離より長く設定したので、像面の光強
度が上がり、受光部からの出力を増大させることができ
るため、出力に乗るノイズを相対的に小さく抑えること
ができ、オイル劣化の検出精度を高めることができる。
また、請求項4によれば、被検オイルの光軸方向の厚さ
を0.05mm以上1.0mm以下としたので、オイル
の流通を滑らかに保ったまま、オイルによる光の吸収を
極力抑えることができ、上記請求項と同様に光の利用効
率を高めることができるため、受光部からの出力が一層
大きく、安定したものとなって、オイル劣化の検出精度
を高めることができるものである。
Further, according to claim 3, the distance from the light emitting portion to the front principal point of the condenser lens is set longer than the distance from the rear principal point to the light receiving portion, so that the light intensity on the image plane is increased. Since the output from the light receiving unit can be increased, the noise on the output can be suppressed to be relatively small, and the oil deterioration detection accuracy can be improved.
Further, according to claim 4, since the thickness of the test oil in the optical axis direction is set to 0.05 mm or more and 1.0 mm or less, absorption of light by the oil is suppressed as much as possible while keeping the oil flow smooth. Since it is possible to improve the light utilization efficiency as in the above claims, the output from the light receiving portion is much larger and stable, and the oil deterioration detection accuracy can be improved. ..

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の実施例のオイル劣化検出装置を示す
概略構成図である。
FIG. 1 is a schematic configuration diagram showing an oil deterioration detection device according to an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 発光部 2 バンドパスフィルター 3 オイルホルダーユニット 4 被検オイル 5 ウインドー部材 6 コンデンサーレンズ 7 受光部 10 反射部材 1 Light emitting part 2 Band pass filter 3 Oil holder unit 4 Test oil 5 Window member 6 Condenser lens 7 Light receiving part 10 Reflecting member

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】赤外線を発光する発光部と、光軸方向に所
定の厚さを有する被検オイルを収容し前記発光部から射
出された光がこの被検オイルを透過するように配置され
たオイルホルダーユニットと、このオイルホルダーユニ
ットから射出した光を受光し、その受光量に応じた電気
信号を出力する受光部とを備えたオイル劣化検出装置に
おいて、前記発光部と前記オイルホルダーユニットの間
にあって、発光部の直後位置に波数1630cm~1近傍
の光のみ透過するバンドパスフィルターを配置し、且つ
前記オイルホルダーユニットと受光部の直前位置に、前
記オイルホルダーユニットから射出した光を受光部に集
光するためのコンデンサーレンズを配置したことを特徴
とするオイル劣化検出装置。
1. A light emitting section for emitting infrared rays and a test oil having a predetermined thickness in the optical axis direction are housed, and light emitted from the light emitting section is arranged so as to pass through the test oil. In an oil deterioration detecting device including an oil holder unit and a light receiving unit that receives light emitted from the oil holder unit and outputs an electric signal according to the amount of received light, an oil deterioration detecting device is provided between the light emitting unit and the oil holder unit. Then, a bandpass filter that transmits only light having a wave number of about 1630 cm to 1 is arranged immediately after the light emitting unit, and the light emitted from the oil holder unit is received at the light receiving unit immediately before the oil holder unit and the light receiving unit. An oil deterioration detection device characterized in that a condenser lens for condensing light is arranged.
【請求項2】前記発光部の前記オイルホルダーユニット
とは反対側(発光部の背後位置)に、オイルホルダーユ
ニットを射出して直接前記コンデンサーレンズに入射す
る光以外の発光部の光をコンデンサーレンズ方向に反射
するための反射部材を配置したことを特徴とする請求項
1記載のオイル劣化検出装置。
2. A condenser lens that emits light from the light emitting portion other than light emitted from the oil holder unit and directly incident on the condenser lens, on the side of the light emitting portion opposite to the oil holder unit (position behind the light emitting portion). The oil deterioration detecting device according to claim 1, further comprising a reflecting member for reflecting the oil in the direction.
【請求項3】前記コンデンサーレンズは、前記発光部か
らコンデンサーレンズの前側主点までの距離が、コンデ
ンサーレンズの後側から前記受光部までの距離より長く
なる位置に設けられていることを特徴とする請求項1記
載のオイル劣化検出装置。
3. The condenser lens is provided at a position where a distance from the light emitting portion to a front principal point of the condenser lens is longer than a distance from a rear side of the condenser lens to the light receiving portion. The oil deterioration detection device according to claim 1.
【請求項4】前記オイルホルダーユニットの被検オイル
の光軸方向の厚さは0.05mm以上1.0mm以下で
あることを特徴とする請求項1記載のオイル劣化検出装
置。
4. The oil deterioration detecting device according to claim 1, wherein the thickness of the oil to be detected in the oil holder unit in the optical axis direction is not less than 0.05 mm and not more than 1.0 mm.
JP29434591A 1991-11-11 1991-11-11 Detecting device of degradation of oil Pending JPH05133884A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29434591A JPH05133884A (en) 1991-11-11 1991-11-11 Detecting device of degradation of oil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29434591A JPH05133884A (en) 1991-11-11 1991-11-11 Detecting device of degradation of oil

Publications (1)

Publication Number Publication Date
JPH05133884A true JPH05133884A (en) 1993-05-28

Family

ID=17806508

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29434591A Pending JPH05133884A (en) 1991-11-11 1991-11-11 Detecting device of degradation of oil

Country Status (1)

Country Link
JP (1) JPH05133884A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200445853Y1 (en) * 2009-02-12 2009-09-03 (주) 휴마스 detector of fuel oil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200445853Y1 (en) * 2009-02-12 2009-09-03 (주) 휴마스 detector of fuel oil

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