JP3538518B2 - Inspection method for electrophotographic photoreceptor - Google Patents
Inspection method for electrophotographic photoreceptorInfo
- Publication number
- JP3538518B2 JP3538518B2 JP09687797A JP9687797A JP3538518B2 JP 3538518 B2 JP3538518 B2 JP 3538518B2 JP 09687797 A JP09687797 A JP 09687797A JP 9687797 A JP9687797 A JP 9687797A JP 3538518 B2 JP3538518 B2 JP 3538518B2
- Authority
- JP
- Japan
- Prior art keywords
- electrophotographic photosensitive
- photosensitive member
- value
- inspecting
- light
- 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
Links
Landscapes
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
- Control Or Security For Electrophotography (AREA)
- Length Measuring Devices By Optical Means (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、電子写真用感光
体の塗布むら、塵埃付着、塗料凝集およびピンホールな
どを検出し、良否を判定する電子写真用感光体の検査方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting an electrophotographic photosensitive member for detecting unevenness in application, dust adhesion, paint agglomeration, pinholes and the like on the photosensitive member for electrophotography and judging pass / fail.
【０００２】[0002]
【従来の技術】従来より光電変換式撮像機構により、電
子写真用感光体に光を照射し、その反射光を電気的に取
り出し、これを数値処理して、電子写真用感光体の良否
を判定する検査方法はよく知られている。光電変換式撮
像機構としては、従来よりイメージオルシコン撮像管、
サチコン撮像管などの撮像管や、金属酸化物半導体（Ｍ
ＯＳ）および電荷結合素子（ＣＣＤ）などの半導体撮像
素子と光学レンズを組み合わせたものなどが用いられて
いる。2. Description of the Related Art Conventionally, light is radiated to a photoconductor for electrophotography by a photoelectric conversion type imaging mechanism, the reflected light is electrically extracted, and this is numerically processed to determine the quality of the photoconductor for electrophotography. Testing methods are well known. Conventionally, the photoelectric conversion type imaging mechanism has been
Image pickup tubes such as Sachicon image pickup tubes and metal oxide semiconductors (M
For example, a combination of a semiconductor imaging device such as an OS (Operating System) and a charge-coupled device (CCD) with an optical lens is used.
【０００３】電気的に取り出した情報がデジタルデータ
の場合はそのまま数値データとして用いることも可能で
あり、またアナログデータの場合はアナログ−デジタル
変換器を用いてデジタルデータに変換してその数値デー
タを用いることが可能である。また数値処理方法として
はしきい値を設定しての２値判定法などが用いられる。[0003] When the electrically extracted information is digital data, it can be used as it is as numerical data. In the case of analog data, it is converted to digital data using an analog-to-digital converter and the numerical data is converted. It can be used. Further, as a numerical processing method, a binary determination method in which a threshold value is set is used.
【０００４】[0004]
【発明が解決しようとする課題】前記のように、種々の
光電変換式撮像機構を用いた電子写真用感光体の検査方
法が提供されているが、必ずしも、満足のゆく検査方法
となっていない。特に、電子写真用感光体において、塗
布むらのように周辺色調にたいして漸進的に色調が変化
する場合は、周辺色調に対して急峻に色調が変化する塗
料凝集やピンホールなどと同じ色調と判定される場合が
ある。こうした場合には色調によりしきい値を設けた２
値判定法などでは誤判定する場合が出てくる。As described above, there have been provided methods for inspecting an electrophotographic photosensitive member using various photoelectric conversion-type image pickup mechanisms, but the method has not always been satisfactory. . In particular, in the electrophotographic photoreceptor, when the color tone changes gradually with respect to the peripheral color tone such as coating unevenness, it is determined that the color tone is the same as paint agglomeration or pinholes in which the color tone changes sharply with respect to the peripheral color tone. In some cases. In such a case, a threshold value is set according to the color tone.
Misjudgment may occur in the value judgment method or the like.
【０００５】この発明に目的は、前記の課題を解決し
て、電子写真用感光体の良否判定において、誤判定が発
生する確率を大幅に低減できる電子写真用感光体の検査
方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for inspecting an electrophotographic photosensitive member which can solve the above-mentioned problems and can greatly reduce the probability of occurrence of an erroneous determination in the quality judgment of the electrophotographic photosensitive member. It is in.
【０００６】[0006]
【課題を解決するための手段】前記の目的を達成するた
めに、電子写真用感光体に光を照射し、その反射光を光
電変換式撮像機構により電気的に取得し、これを数値処
理して、電子写真用感光体の良否が判定される電子写真
用感光体の検査方法において、前記反射光を光電変換式
撮像機構で電気信号に変換し、該電気信号からＬ値とそ
の変動幅及び微分量を算出し、該微分量の大きさで電子
写真用感光体の良否が判定される検査方法とする。In order to achieve the above object, an electrophotographic photosensitive member is irradiated with light, and the reflected light is irradiated with light.
In the method of inspecting an electrophotographic photosensitive member, in which the electric light is electrically acquired by an electro-conversion type imaging mechanism and subjected to numerical processing to determine the quality of the electrophotographic photosensitive member, the reflected light is detected by a photoelectric conversion type imaging mechanism. Is converted into an electric signal, and the L value and its value are converted from the electric signal.
And the amount of differentiation of the electrophotographic photoreceptor is determined based on the magnitude of the amount of differentiation .
【０００７】この検査方法にすることで、色調の変化が
急峻な場合と塗布むらのような漸進的な変化とが区別が
ついて、実用上問題ないゆるやかな塗布むらを不良と判
定することが避けられる。また電気信号の微分量の大き
さに対してしきい値を設け、該しきい値と比較して検出
される電気信号の微分量の大小によって、電子写真用感
光体の良否が判定されるとよい。[0007] With this inspection method, a distinction can be made between a sharp change in color tone and a gradual change such as coating unevenness, and it is possible to avoid gradual application unevenness which is not a problem in practice. Can be Also, a threshold value is provided for the magnitude of the differential amount of the electric signal, and the quality of the electrophotographic photosensitive member is determined based on the magnitude of the differential amount of the electric signal detected by comparing with the threshold value. Good.
【０００８】このように０、１判定することで、高精度
な良否判定を行うことが可能となる。また色調の計測値
としてＬ値が用いられると効果的である。色調の中で明
るさ表すＬ値は電子写真用感光体の特性の中で、最も重
要な特性であるのでこれを良否判定に使うことは極めて
効果的である。Ｌ値は１９７６年に国際照明委員会（Ｃ
ＩＥで規格化され、日本でもＪＩＳ（ＪＩＳ８７２９）
において採用されている。[0010] By making 0 and 1 determinations as described above, it is possible to make a high-precision quality determination. It is also effective if the L value is used as the color tone measurement value. Since the L value representing the brightness in the color tone is the most important characteristic among the characteristics of the electrophotographic photoreceptor, it is extremely effective to use this value for quality determination. The L value was determined by the International Commission on Illumination (C
Standardized by IE, JIS (JIS 8729) in Japan
Has been adopted.
【０００９】[0009]
【発明の実施の形態】図１はこの発明の一実施例で、電
子写真用感光体の検査方法を示す要部ブロック図であ
る。直径３０ｍｍで長さ２６０ｍｍの円筒形の電子写真
用感光体素管１（以下素管と略す）を図のように定速回
転させ、光源２から線状の照射光３を照射する。素管１
からの反射光４を焦点５０ｍｍで明るさｆ＝３．５の写
真用光学レンズと１２８万画素のＣＣＤを用いたカメラ
で構成される光電変換式撮像機構５で補足し、電気信号
６を取り出す。この電気信号６を６４ビットのアナログ
−デジタル変換器７に入力し、デジタル化した電気信号
であるデジタルデータを取り出す。この取り出されたデ
ジタルデータをコンピュータ８で数値処理し、色調の計
測値の一つである明るさを表すＬ値とそのＬ値の変動幅
および微分係数（微分量のこと）を算出し、このＬ値と
そのＬ値の変動幅および微分係数の大きさで素管１の良
否を判定する。例えばＬ値に許容幅を設定し、許容幅内
に出力データが入るか否かで良否を判定する。またその
Ｌ値の変動許容幅および微分係数に所定のしきい値を設
定し、そのしきい値以下の場合を良品、しきい値以上の
場合を不良品とする２値判定法で良否を判定する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an essential part of a method for inspecting an electrophotographic photosensitive member according to an embodiment of the present invention. A cylindrical electrophotographic photosensitive element tube 1 having a diameter of 30 mm and a length of 260 mm (hereinafter abbreviated as an element tube) is rotated at a constant speed as shown in the figure, and a light source 2 emits linear irradiation light 3. Raw pipe 1
Reflected light 4 is captured by a photoelectric conversion type imaging mechanism 5 composed of a camera using a photographic optical lens having a focus of 50 mm and a brightness f = 3.5 and a CCD having 1.28 million pixels, and an electric signal 6 is extracted. . The electric signal 6 is input to a 64-bit analog-digital converter 7 to extract digital data, which is a digitized electric signal. The extracted digital data is numerically processed by a computer 8 to calculate an L value representing brightness, which is one of the measured values of the color tone, a fluctuation range of the L value, and a differential coefficient (differential amount). The quality of the pipe 1 is determined based on the L value, the fluctuation range of the L value, and the magnitude of the differential coefficient. For example, an allowable width is set for the L value, and the pass / fail is determined based on whether or not the output data falls within the allowable width. In addition, a predetermined threshold value is set for the allowable variation range and differential coefficient of the L value, and a pass / fail judgment is made by a binary judgment method in which a value below the threshold value is regarded as a good product and a case exceeding the threshold value is regarded as a defective product. I do.
【００１０】一例として、Ｌ値の良品域を４２．０以上
で、且つ、４８．０以下とした。４２．０未満だと暗す
ぎ、４８．０を越えると明るすぎて画像として実用でき
ない。また良品域内のＬ値における塗料凝集を検出する
目的で、同一電子写真用感光体素管１内でのＬ値良品域
内の変動許容幅を２．０以下とした。２．０以上の塗料
凝集は画像として実用できない。しかし、この変動許容
幅が２．０を越えても漸進的な塗布むらであるならば画
像として実用できる。そこでこの救済策として、Ｌ値の
微分係数を判定量に加えた。つまり微分係数の良品域を
１．０以下とし、同一電子写真用感光体素管１内でのＬ
値良品域内の変動許容幅の上限値である２．０を越えた
場合でも微分係数が良品域内に入っていれば良品と判定
した。つまり微分係数が１．０以下ということは塗料む
らが漸進的に変化していることを意味し、また塗料凝集
がないことを意味しているために、素管性能としては問
題がなく、画像として実用できる。 しかし、微分係数
が１．０を越えた場合は塗布むらが急峻に変化しており
画像として実用できない。つまり変動許容幅が２．０を
越え、且つ微分係数が１．０を越えると急峻な塗布むら
が生じているか、または塗料凝集が生じており、電子写
真用感光体性能として問題があり、画像として実用でき
ない。As an example, the non-defective area of the L value is set to 42.0 or more and 48.0 or less. If it is less than 42.0, it is too dark, and if it exceeds 48.0, it is too bright and cannot be used as an image. In order to detect the aggregation of the paint at the L value in the non-defective area, the allowable fluctuation range in the L value non-defective area in the same electrophotographic photosensitive element tube 1 was set to 2.0 or less. Paint agglomeration of 2.0 or more cannot be used as an image. However, even if the allowable fluctuation range exceeds 2.0, it can be used as an image if the application unevenness is gradual. Therefore, as a remedy, the differential coefficient of the L value was added to the determination amount. That is, the non-defective area of the differential coefficient is set to 1.0 or less, and L
Even when the value exceeds the upper limit of the allowable variation range of 2.0 in the good quality area, if the derivative is within the good quality area, it is determined to be good. In other words, when the differential coefficient is 1.0 or less, it means that the paint unevenness is gradually changing, and it means that there is no paint agglomeration. It can be practically used. However, when the differential coefficient exceeds 1.0, the coating unevenness changes sharply and cannot be used as an image. In other words, when the allowable variation range exceeds 2.0 and the differential coefficient exceeds 1.0, sharp coating unevenness occurs or paint agglomeration occurs, and there is a problem in electrophotographic photoreceptor performance. As practical.
【００１１】[0011]
【表１】 [Table 1]
【００１２】表１に２０本の電子写真用感光体素管で検
査、判定を行った結果を示す。従来の検査方法（表の比
較実験例の欄）では実用上問題ない塗料むらを不良と判
定していたものが、この発明の検査方法（表の実験例の
欄）では良品と判定されており、誤判定が防止されてい
る。Table 1 shows the results of inspection and judgment performed on 20 electrophotographic photosensitive drums. The ratio of the conventional inspection method (Table
In the comparative example, the non-uniform paint which is practically acceptable was determined to be defective. However, in the inspection method of the present invention ( experimental example in the table), it was determined to be non-defective, and erroneous determination was prevented. I have.
【００１３】[0013]
【発明の効果】この発明によれば、Ｌ値の微分量（微分
係数のこと）を素管の良否判定量として追加すること
で、従来方法では不良と判定されていた実用上問題にな
らない塗布むらが、良品と判定できるようになり、誤判
定する確率を大幅に低減することができる。According to the present invention, by adding the differential amount (differential coefficient) of the L value as the quality judgment value of the raw pipe, the coating method which has been judged to be defective in the conventional method does not cause a practical problem. Unevenness can be determined as a non-defective product, and the probability of erroneous determination can be significantly reduced.
【図１】図１はこの発明の一実施例で、電子写真用感光
体の検査方法を示す要部ブロック図FIG. 1 is a main block diagram showing a method for inspecting an electrophotographic photosensitive member according to an embodiment of the present invention;
１ 電子写真用感光体素管 ２ 光源 ３ 照射光 ４ 反射光 ５ 光電変換式撮像機構 ６ 電気信号 ７ アナログ−デジタル変換器 ８ コンピュータ 1 Photoconductor tube for electrophotography 2 Light source 3 Irradiation light 4 reflected light 5 Photoelectric conversion type imaging mechanism 6 electrical signals 7 Analog-digital converter 8 Computer
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01B 11/00 - 11/30 G03G 5/00 G03G 21/00 G01N 21/88 ──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. 7 , DB name) G01B 11/00-11/30 G03G 5/00 G03G 21/00 G01N 21/88
Claims (2)
光を光電変換式撮像機構により電気的に取得し、これを
数値処理して、電子写真用感光体の良否が判定される電
子写真用感光体の検査方法において、前記反射光を光電
変換式撮像機構で電気信号に変換し、該電気信号からＬ
値とその変動幅及び微分量を算出し、該微分量の大きさ
で電子写真用感光体の良否が判定されることを特徴とす
る電子写真用感光体の検査方法。 An electrophotographic photosensitive member is irradiated with light and reflected.
In a method for inspecting an electrophotographic photosensitive member, in which light is electrically acquired by a photoelectric conversion type imaging mechanism and subjected to numerical processing to determine whether or not the electrophotographic photosensitive member is good, the reflected light is subjected to photoelectric conversion type imaging. It is converted into an electrical signal by the mechanism, L from the electrical signal
A method for inspecting an electrophotographic photosensitive member, comprising calculating a value, a variation width thereof, and a differential amount, and determining whether the electrophotographic photosensitive member is good or not based on the magnitude of the differential amount .
け、該しきい値と比較して検出される該微分量の大小に
よって、電子写真用感光体の良否が判定されることを特
徴とする請求項１記載の電子写真用感光体の検査方法。Wherein the threshold provided for the magnitude of the differential quantity, by the differential quantity of the magnitude to be detected in comparison with the threshold value, the quality of the electrophotographic photoreceptor is determined The method for inspecting an electrophotographic photosensitive member according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09687797A JP3538518B2 (en) | 1997-04-15 | 1997-04-15 | Inspection method for electrophotographic photoreceptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09687797A JP3538518B2 (en) | 1997-04-15 | 1997-04-15 | Inspection method for electrophotographic photoreceptor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10288515A JPH10288515A (en) | 1998-10-27 |
| JP3538518B2 true JP3538518B2 (en) | 2004-06-14 |
Family
ID=14176658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09687797A Expired - Lifetime JP3538518B2 (en) | 1997-04-15 | 1997-04-15 | Inspection method for electrophotographic photoreceptor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3538518B2 (en) |
-
1997
- 1997-04-15 JP JP09687797A patent/JP3538518B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10288515A (en) | 1998-10-27 |
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