JP3391888B2 - Light reflection type sensor and its detection method - Google Patents
Light reflection type sensor and its detection methodInfo
- Publication number
- JP3391888B2 JP3391888B2 JP12490594A JP12490594A JP3391888B2 JP 3391888 B2 JP3391888 B2 JP 3391888B2 JP 12490594 A JP12490594 A JP 12490594A JP 12490594 A JP12490594 A JP 12490594A JP 3391888 B2 JP3391888 B2 JP 3391888B2
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- JP
- Japan
- Prior art keywords
- light
- reflection type
- type sensor
- filter
- receiving element
- 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.)
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Dry Development In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
- Controlling Sheets Or Webs (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
- Optical Transform (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電子写真プロセスを
用いたレ−ザプリンタ等のプリンタ，複写機，フアクシ
ミリ装置等の画像濃度制御装置等に有用な光反射型セン
サの検出方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of detecting a light reflection type sensor which is useful for a printer such as a laser printer using an electrophotographic process, a copying machine, an image density controller such as a facsimile machine.
【０００２】[0002]
【従来の技術】光反射型センサの発受光方法の一例とし
て、画像濃度制御装置を示し説明する。像担持体である
感光体の表面に形成したトナー付着量を光反射型センサ
で受光した反射光量によって検出し、検出した付着量に
応じてトナー補給量を制御し画像濃度を安定的に維持す
る画像濃度制御装置は従来より一般的に利用されてい
る。2. Description of the Related Art An image density control device will be described as an example of a light emitting and receiving method of a light reflection type sensor. The amount of toner adhering to the surface of the photoreceptor, which is the image carrier, is detected by the amount of reflected light received by the light reflection type sensor, and the toner replenishment amount is controlled according to the detected amount of adhering to maintain stable image density. The image density control device has been generally used conventionally.
【０００３】前記光反射型センサには、大きく分けて感
光体面の反射光のうち正反射を受光するタイプと乱反射
を受光するタイプの２通りある。前者は主に光を吸収す
る黒色トナーの制御に用いられる。後者は主にトナー表
面で光が乱反射するカラートナーの制御に用いられてい
る。The light reflection type sensor is roughly classified into two types: a type for receiving specular reflection and a type for receiving irregular reflection of the light reflected by the surface of the photosensitive member. The former is mainly used to control black toner that absorbs light. The latter is mainly used for controlling color toner in which light is diffusely reflected on the toner surface.
【０００４】後者は乱反射光を受光するという目的か
ら、発光光、及び受光光と感光体表面のなす角度、即ち
入射角度θ１及び反射角度θ２は、しばしば、θ１≠θ
２ という関係で用いられている。一方前者の場合に
は、正反射を受光するために通常はθ１＝θ２ の関係
にある。In the latter case, for the purpose of receiving diffusely reflected light , the angle between the emitted light and the received light and the surface of the photosensitive member, that is, the incident angle θ1 and the reflection angle θ2, is often θ1 ≠ θ.
It is used in the relationship of 2. On the other hand, in the former case, the relationship of θ1 = θ2 is normally satisfied because the specular reflection is received.
【０００５】ところで通常のコピー画像においてライン
画像及びベタ画像部はトナー付着量が多く、これらの画
像品質を高く維持するためには、極力高トナー付着量パ
ターンを検出し制御することが重要である。高トナー付
着パターンを検出するためにはトナー付着量に対する光
反射型センサの感度を高くする必要があり、そのために
はトナー付着パターンへ光反射したときにトナー粒子に
よってできるシャドウファクターを極力小さくすること
が効果的である。By the way, in a normal copy image, the line image and the solid image portion have a large amount of toner adhesion, and in order to maintain high image quality of these, it is important to detect and control a pattern with a toner adhesion amount as high as possible. . In order to detect a high toner adhesion pattern, it is necessary to increase the sensitivity of the light reflection type sensor to the toner adhesion amount, and for that purpose, the shadow factor formed by the toner particles when light is reflected to the toner adhesion pattern should be minimized. Is effective.
【０００６】しかし、これは、前述θ１及びθ２を小さ
くすることで受光光の焦点距離が光反射型センサ面から
遠くなってしまい、受光光の損失が大きいという不具合
がある。また、前記受発光の焦点距離を短くするために
光反射型センサの受光素子と発光素子を近接配置するこ
とも考えられるが、この場合には光反射型センサの入反
射光路間に設けたフィルタの内面反射等による検出制度
の低下、特にフィルタが光反射型センサと密着しない場
合に顕著になるので問題となる。尚、前記光反射型セン
サはトナー粒子を現像又はクリーニングする感光体近傍
に配置するため、その検出面にはフィルタの設置が必要
不可欠である。However, this has a problem that the focal length of the received light becomes far from the light reflection type sensor surface by reducing the above-mentioned θ1 and θ2, and the loss of the received light is large. Further, it is conceivable that the light receiving element and the light emitting element of the light reflection type sensor are arranged close to each other in order to shorten the focal length of the light reception and emission. In this case, a filter provided between the incident / reflection optical paths of the light reflection type sensor. This is a problem because the detection accuracy is reduced due to the internal reflection of the above, especially when the filter is not in close contact with the light reflection type sensor. Since the light reflection type sensor is arranged in the vicinity of the photoconductor that develops or cleans the toner particles, it is necessary to install a filter on the detection surface.
【０００７】前述のようなフィルタの内面反射を低減す
るために、フィルタの形状を発光部と受光部で同一平面
にしないという工夫がなされているが、フィルタの形状
が複雑となることでコスト高になり、清掃が困難になる
等の問題があった。In order to reduce the internal reflection of the filter as described above, it has been devised that the shape of the filter is not flush with the light emitting portion and the light receiving portion. However, the complicated shape of the filter leads to high cost. There was a problem that cleaning became difficult.
【０００８】[0008]
【発明が解決しようとする課題】本発明は以上のような
問題点を解決するためになされたものであり、その目的
とするところは、正反射光を受光するセンサにおいて、
低コストで光反射型センサのフィルタの内面反射を低減
し、清掃が容易且つ確実な清掃効果が得られ、更に着脱
等によるフィルタの組み付けガタに対する影響を抑えた
光反射型センサの検方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a sensor for receiving specularly reflected light.
Providing a method for detecting a light-reflective sensor that reduces internal reflection of the filter of the light-reflective sensor at low cost, provides easy and reliable cleaning effect, and suppresses the influence on the looseness of the filter assembling due to attachment and detachment. To do.
【０００９】[0009]
【課題を解決するための手段】本発明は、前記問題に従
い、発光素子と受光素子とを並列に配置して一体に形成
し且つ該発光素子と受光素子の検出面側に平坦で光透過
性のあるフィルタを該発光素子と受光素子に対して共通
に設けた光反射型センサにより、反射光のうち正反射光
を受光する検出方法において、前記光反射型センサを移
動している物体の表面の被検出表面近傍に、該センサの
発光素子側のフィルタ表面と被検出表面との距離と、受
光素子側のフィルタの表面と被検出表面との距離を異な
る大きさを有するように配置し、発光素子からの光を該
被検出表面に照射し、その反射光のうち正反射を受光素
子により受光する。According to the present invention, in accordance with the above problem, a light emitting element and a light receiving element are arranged in parallel and integrally formed, and the detection surface side of the light emitting element and the light receiving element is flat and transparent. Common filter for the light emitting element and the light receiving element
By the light reflection type sensor provided in Ri, of the reflected light regularly reflected light
In the detection method of receiving light, in the vicinity of the surface to be detected of the surface of the object moving the light reflection type sensor, the distance between the filter surface on the light emitting element side of the sensor and the surface to be detected, and the filter on the light receiving element side. The distance between the surface and the surface to be detected is arranged so as to have different sizes, light from the light emitting element is applied to the surface to be detected, and specular reflection of the reflected light is received by the light receiving element.
【００１０】[0010]
【作用】請求項１及び５及び７においては、被検出表面
とフィルタ表面の両端部との距離又は光反射型センサの
両素子とフィルタ裏面の両端部との距離を異なる距離に
しているので、被検出表面とフィルタ表面との距離の長
い方又は光反射型センサの素子とフィルタ裏面との距離
の短い方を手前にすることで、光反射型センサ若しくは
被検出の物体を着脱することなく、フィルタ面の形状を
容易に確認することができる。またフィルタ表面の清掃
において、光反射型センサーを着脱することなく清掃で
き、布或はブラシ等で拭く場合や清掃用の空気を吹き付
ける場合等、いづれにおいても清掃を容易に行うことが
できる。According to the present invention, the distance between the surface to be detected and both ends of the filter surface or both elements of the light reflection type sensor and both ends of the back surface of the filter are different. By placing the longer distance between the surface to be detected and the filter surface or the shorter distance between the element of the light reflection type sensor and the back surface of the filter, without attaching or detaching the light reflection type sensor or the object to be detected, The shape of the filter surface can be easily confirmed. Further, in cleaning the surface of the filter, it is possible to perform cleaning without attaching or detaching the light reflection type sensor, and it is possible to easily perform cleaning in any case such as wiping with a cloth or a brush or blowing air for cleaning.
【００１１】更にフィルタ内における入反射光の内面反
射による影響も低減することができ、精度の良い検出が
行える。また、光反射型センサの表面に設けたフィルタ
面が平坦であり複雑な形状をしていないので、製造上容
易で且つ低コスト化が図れる。Further, it is possible to reduce the influence of the internal reflection of the incident / reflected light in the filter, and it is possible to perform the detection with high accuracy. Moreover, since the filter surface provided on the surface of the light reflection type sensor is flat and does not have a complicated shape, it is easy to manufacture and the cost can be reduced.
【００１２】請求項２及び６においては、光反射型セン
サのフィルタに対して、反射光の入射角をフィルタ面と
垂直にしているので、受光素子にて受光する光量の減衰
を極めて低く抑えることができ、光反射型センサを効率
良く使用することができる。In the second and sixth aspects, since the incident angle of the reflected light is perpendicular to the filter surface of the filter of the light reflection type sensor, the attenuation of the amount of light received by the light receiving element can be suppressed to an extremely low level. Therefore, the light reflection type sensor can be efficiently used.
【００１３】請求項３においては、光反射型センサのフ
ィルタと被検出の物体間の距離のうち、空気気流の上流
側を下流側より大きくしているので、被検出の物体近傍
に設置した空気吹付装置によって吹き付けた気流がフィ
ルタ平面上に対しては斜めに当たるので、フィルタ平面
上に付着した異物或るいはトナー等を流体力学上、より
効果的に除去し、フィルタ平面上を清掃することができ
る。In the third aspect of the present invention, the upstream side of the air flow is larger than the downstream side of the distance between the filter of the light reflection type sensor and the object to be detected. Since the air flow blown by the spraying device impinges obliquely on the filter plane, it is possible to more effectively remove foreign matter or toner adhering to the filter plane in fluid dynamics and to clean the filter plane. it can.
【００１４】請求項４においては、発光光と受光光とで
構成する平面に前記円筒体の回転軸が略含まれるよう配
置したことで回転軸方向に関するシャドウファクターを
極力小さくすることができる。According to the present invention, the shadow factor in the direction of the rotation axis can be minimized by arranging so that the rotation axis of the cylindrical body is substantially included in the plane formed by the emitted light and the received light.
【００１５】[0015]
【実施例】本発明の検出方法について、トナーを用いた
画像形成装置の画像濃度制御方法を例として挙げ、以下
に説明する。図１は、光反射型センタを備えた画像濃度
制御方法の概略構成を示している。発光素子（２）と受
光素子（３）とを並列させて一体に形成し且つその表面
に平坦で光透過性のあるフィルタ（４）を設けた光反射
型センサ（１）を感光体（５）の検出表面近傍に配置
し、光反射型センサ（１）の発光素子（２）側のフィル
タ（４）表面端部と感光体（５）表面との距離又は受光
素子（３）とフィルタ（４）裏面との距離と受光素子
（３）側のフィルタ（４）表面端部と感光体（５）表面
との距離又は光反射型センサ（１）の発光素子（２）と
フィルタ（４）裏面との距離とが異なるように配置し、
発光素子（２）からの光を感光体（５）表面に照射し、
その正反射光を受光素子（３）により受光し感光体
（５）表面を検出する。尚、この時、発光素子（２）よ
り感光体（５）へ向かう発光光の入射角をθ１とし、感
光体（５）から受光素子（３）へ向かう正反射光の反射
角をθ２とすると、これら入反射角は、θ１＝θ２ の
関係にしてある。EXAMPLES The detection method of the present invention will be described below by taking an image density control method of an image forming apparatus using toner as an example. FIG. 1 shows a schematic configuration of an image density control method having a light reflection type center. A light-reflective sensor (1) having a light-emitting element (2) and a light-receiving element (3) arranged in parallel and integrally and provided with a flat and light-transmitting filter (4) on the surface of the photoconductor (5) ) Is disposed in the vicinity of the detection surface, and the distance between the surface end of the filter (4) on the light emitting element (2) side of the light reflection type sensor (1) and the surface of the photoconductor (5) or the light receiving element (3) and the filter (3). 4) Distance between the back surface and the distance between the surface end of the filter (4) on the light receiving element (3) side and the surface of the photoconductor (5) or the light emitting element (2) and the filter (4) of the light reflection type sensor (1). Arrange so that the distance from the back side is different,
The surface of the photoconductor (5) is irradiated with light from the light emitting element (2),
The specularly reflected light is received by the light receiving element (3) and the surface of the photoconductor (5) is detected. At this time, if the incident angle of the emitted light from the light emitting element (2) toward the photoconductor (5) is θ1, and the reflection angle of the regular reflection light from the photoconductor (5) toward the light receiving element (3) is θ2. , And these incident and reflected angles are in a relation of θ1 = θ2.
【００１６】図２は、図１の光反射型センタを備えた画
像濃度制御方法において、感光体（５）からの正反射光
と受光素子（３）側のフィルタ（４）が垂直に位置する
画像濃度制御方法の概略構成を示している。FIG. 2 shows the image density control method provided with the light reflection type center shown in FIG. 1, in which the specularly reflected light from the photoconductor (5) and the filter (4) on the side of the light receiving element (3) are positioned vertically. The schematic structure of the image density control method is shown.
【００１７】図３は、図１の光反射型センタを備えた画
像濃度制御方法において、光反射型センサ（１）の発光
素子（２）側のフィルタ（４）端部と感光体（５）表面
との距離を受光素子（３）側のフィルタ（４）端部と感
光体（５）表面との距離より長くなるように配置し、発
光素子（２）側のフィルタ（４）端部近傍に空気吹付装
置（６）を設けた画像濃度制御方法の概略構成を示して
いる。FIG. 3 shows the image density control method provided with the light-reflective center shown in FIG. 1, wherein the end of the filter (4) on the light-emitting element (2) side of the light-reflective sensor (1) and the photoconductor (5). Arranged so that the distance from the surface is longer than the distance between the end of the filter (4) on the light receiving element (3) side and the surface of the photoconductor (5), and the vicinity of the end of the filter (4) on the light emitting element (2) side. The schematic configuration of an image density control method in which an air blowing device (6) is provided in FIG.
【００１８】図４は、図１の光反射型センタを備えた画
像濃度制御方法において、発光光（２）と受光光（３）
とで構成する平面に感光体（５）の回転軸が略含まれる
よう配置した画像濃度制御方法の概略構成を示してい
る。FIG. 4 shows an emission density (2) and a reception light (3) in the image density control method having the light reflection type center shown in FIG.
2 shows a schematic configuration of an image density control method in which the plane constituted by and is arranged so that the rotation axis of the photoconductor (5) is substantially included.
【００１９】このように、トナーを用いた画像形成装置
の画像濃度制御方法において本発明の検出方法を実施す
ることが可能であるが、本発明は、その他にも被検出表
面の汚れや傷等の検出装置に利用することができる。As described above, the detection method of the present invention can be carried out in the image density control method of the image forming apparatus using the toner. However, the present invention is not limited to this. Can be used for the detection device.
【００２０】[0020]
【発明の効果】本発明によると、反射光を受光するセン
サにおいて、低コストで光反射型センサのフィルタの内
面反射を低減し、清掃が容易且つ確実な清掃効果が得ら
れ、更に着脱等によるフィルタの組み付けガタに対する
影響を抑えることができ、正確な検出方法を提供するこ
とができる。According to the present invention, in the sensor for receiving the reflected light, the internal reflection of the filter of the light reflection type sensor can be reduced at a low cost, and the cleaning effect can be easily and surely obtained. It is possible to suppress the influence of the filter on the mounting backlash, and to provide an accurate detection method.
【００２１】[0021]
【図１】この発明の第１実施例を示す概略構成である。FIG. 1 is a schematic configuration showing a first embodiment of the present invention.
【図２】この発明の第２実施例を示す概略構成である。FIG. 2 is a schematic configuration showing a second embodiment of the present invention.
【図３】この発明の第３実施例を示す概略構成である。FIG. 3 is a schematic configuration showing a third embodiment of the present invention.
【図４】この発明の第４実施例を示す概略構成である。FIG. 4 is a schematic configuration showing a fourth embodiment of the present invention.
１ 光反射型センサ ２ 発光素子 ３ 受光素子 ４ フィルタ ５ 感光体 ６ 空気吹付装置 1 Light reflection type sensor 2 Light emitting element 3 Light receiving element 4 Filter 5 Photoconductor 6 Air spraying device
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｇ０３Ｇ 15/08 １１５ Ｇ０３Ｇ 15/08 １１５ // Ｂ６５Ｈ 7/02 Ｂ６５Ｈ 7/02 (58)調査した分野(Int.Cl.7，ＤＢ名) G01N 21/00 - 21/01 G01N 21/17 - 21/61 実用ファイル（ＰＡＴＯＬＩＳ) 特許ファイル（ＰＡＴＯＬＩＳ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 7 Identification code FI G03G 15/08 115 G03G 15/08 115 // B65H 7/02 B65H 7/02 (58) Fields investigated (Int.Cl. 7 , DB name) G01N 21/00-21/01 G01N 21/17-21/61 Practical file (PATOLIS) Patent file (PATOLIS)
Claims (7)
体に形成し且つ該発光素子と受光素子の検出面側に平坦
で光透過性のあるフィルタを該発光素子と受光素子に対
して共通に設けた光反射型センサにより、反射光のうち
正反射光を受光する検出方法において、 前記光反射型センサを移動している物体の表面の被検出
表面近傍に、該センサの発光素子側のフィルタ表面と被
検出表面との距離と、受光素子側のフィルタの表面と被
検出表面との距離を異なる大きさを有するように配置
し、発光素子からの光を該被検出表面に照射し、その反
射光のうち正反射を受光素子により受光することを特徴
とする光反射型センサによる検出方法。1. A light-emitting element and a light-receiving element are arranged in parallel and integrally formed, and a flat and light-transmitting filter is provided on the detection surface side of the light-emitting element and the light-receiving element for the light-emitting element and the light-receiving element.
Ri by the light reflection type sensor provided in common, and the reflected light
In the detection method of receiving specularly reflected light, in the vicinity of the surface to be detected of the surface of the object moving the light reflection type sensor, the distance between the filter surface on the light emitting element side of the sensor and the surface to be detected, and the light receiving element The distance between the surface of the side filter and the surface to be detected is arranged so as to have different sizes, light from the light emitting element is irradiated to the surface to be detected, and specular reflection of the reflected light is received by the light receiving element. A detection method using a light reflection type sensor characterized by the above .
被検出表面から受光素子への反射光の入射角がフィルタ
表面と略垂直であることを特徴とする請求項１に記載し
た光反射型センサによる検出方法。2. The filter of the light reflection type sensor,
The incident angle of the reflected light from the surface to be detected to the light receiving element is filtered
The detection method by the light reflection type sensor according to claim 1, wherein the detection method is substantially perpendicular to the surface .
出表面との距離を長くした方のフィルタ端部近傍に空気
吹付装置を設けることを特徴とする請求項１に記載した
光反射型センサによる検出方法。3. An air blowing device is provided in the vicinity of the filter end portion where the distance between the filter surface of the light reflection type sensor and the surface to be detected is long.
Detection method by light reflection type sensor .
ラムの表面であり、前記光反射型センサを発光光線と受
光光線とで形成する平面に感光体ドラムの回転軸が略含
まれるように配置したことを特徴とする請求項１より請
求項３までのいずれか１つに記載の光反射型センサによ
る検出方法。4. The surface to be detected of a moving object is the surface of a photosensitive drum, and the plane formed by the light reflection type sensor and the received light beam includes the rotation axis of the photosensitive drum. The light reflection type sensor according to any one of claims 1 to 3, wherein the light reflection type sensor is arranged as follows .
Detection method that.
裏面との距離と、受光素子とフィルタ裏面との距離を、
受光素子とフィルタ裏面との距離が長くなるように異な
らせて配置することを特徴とする請求項１に記載した光
反射型センサによる検出方法。 5. A light emitting element and a filter of the light reflection type sensor.
The distance between the back surface and the distance between the light receiving element and the back surface of the filter
Make sure that the distance between the light receiving element and
The light according to claim 1, characterized in that the light is arranged.
Detection method using a reflective sensor.
角が前記フィルタ表面と略垂直であることを特徴とする
請求項１に記載した光反射型センサによる検出方法。 6. Incident of reflected light from a surface to be detected to a light receiving element
The corners are substantially perpendicular to the filter surface
A detection method using the light reflection type sensor according to claim 1.
体に形成し且つ該発光素子と受光素子の検出面側に平坦
で光透過性のあるフィルタを該発光素子と受光素子に対
して共通に設けた光反射型センサにより、反射光のうち
正反射を受光する検出方法において、 前記光反射型センサを像担持体近傍に配置し、該センサ
の発光素子側のフィルタ表面と像担持体表面との距離
と、受光素子側のフィルタ表面と像担持体表面との距離
を異なる大きさを有するように配置し、発光素子からの
光を該像担持体表面に照射し、その反射光を受光素子に
より受光することを特徴とする光反射型センサによる検
出方法。7. A light-emitting element and a light-receiving element are arranged in parallel and integrally formed, and a flat and light-transmitting filter is provided on the detection surface side of the light-emitting element and the light-receiving element for the light-emitting element and the light-receiving element.
Ri by the light reflection type sensor provided in common, and the reflected light
In the detection method of receiving regular reflection , the light reflection type sensor is arranged in the vicinity of the image carrier, the distance between the filter surface on the light emitting element side of the sensor and the surface of the image carrier, and the filter surface on the light receiving element side and the image. A light-reflective sensor characterized in that it is arranged so as to have different sizes from the surface of the carrier, the light from the light emitting element is applied to the surface of the image carrier, and the reflected light is received by the light receiving element. detection <br/> out the method according to the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12490594A JP3391888B2 (en) | 1994-06-07 | 1994-06-07 | Light reflection type sensor and its detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12490594A JP3391888B2 (en) | 1994-06-07 | 1994-06-07 | Light reflection type sensor and its detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07333146A JPH07333146A (en) | 1995-12-22 |
| JP3391888B2 true JP3391888B2 (en) | 2003-03-31 |
Family
ID=14897020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12490594A Expired - Fee Related JP3391888B2 (en) | 1994-06-07 | 1994-06-07 | Light reflection type sensor and its detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3391888B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208458759U (en) * | 2018-07-11 | 2019-02-01 | 深圳华羿科技有限公司 | A kind of laser photoelectricity reflection detection sensor |
-
1994
- 1994-06-07 JP JP12490594A patent/JP3391888B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07333146A (en) | 1995-12-22 |
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