JPS63304281A - Detection of image density - Google Patents
Detection of image densityInfo
- Publication number
- JPS63304281A JPS63304281A JP62140061A JP14006187A JPS63304281A JP S63304281 A JPS63304281 A JP S63304281A JP 62140061 A JP62140061 A JP 62140061A JP 14006187 A JP14006187 A JP 14006187A JP S63304281 A JPS63304281 A JP S63304281A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light receiving
- image density
- light emitting
- emitting 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 108091008695 photoreceptors Proteins 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
- G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
- G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は複写機、プリンタ、印刷機等電子写真複写装置
における画像濃度の検知方法に関し、特に２成分複写現
像装置における黒トナー、カラートナーの画像濃度制御
方法に関する。Detailed Description of the Invention [Technical Field] The present invention relates to a method for detecting image density in electrophotographic copying devices such as copying machines, printers, printing machines, etc., and particularly to image density control of black toner and color toner in two-component copying and developing devices. Regarding the method.
この種電子写真複写装置では周知のプロセスにより作像
が実行される。In this type of electrophotographic reproduction apparatus, image formation is performed by a well-known process.
そして感光体に近接して反射型のフォトセンサ（発光素
子と受光素子とよりなる）を設け、このフォトセンサに
より、基準パターン像と、イレースされた感光体面を読
み取り、画像濃度制御が行ねれるようになっている。A reflective photosensor (consisting of a light-emitting element and a light-receiving element) is installed near the photoreceptor, and this photosensor reads the reference pattern image and the erased surface of the photoreceptor to control image density. It looks like this.
ところで、黒トナーモード、カラートナーモードを有す
る複写機において感光体面に対する発光素子と受光素子
のなす角度（以下θＰという）を大きくすることにより
、カラートナーに対する感度が向上する事および黒トナ
ーに関してはθＰが小さい方がより優れた制御能力があ
る事が知られているため、黒トナーに関してはθＰの小
さい画像濃度制御装置で、カラートナーに関してはθ。By the way, in a copying machine that has a black toner mode and a color toner mode, by increasing the angle (hereinafter referred to as θP) between the light emitting element and the light receiving element with respect to the photoreceptor surface, the sensitivity to color toner can be improved, and the sensitivity to black toner can be increased by increasing the angle θP for black toner. It is known that the smaller the value of θP, the better the control ability, so an image density control device with a small θP is used for black toner, and θP is used for color toner.
の大きい画像濃度制御装置で、それぞれ個別に画像濃度
のｌ！１ｌｌＪＷＩを行うことが従来より行われていた
。The image density control device has a large size, and the image density l! It has been conventional practice to perform 1llJWI.
そのためフォトセンサを取り付ける位置およびスペース
が問題となり、また部品点数が増えコストアップになる
という不具合があった。Therefore, the location and space for installing the photosensor became a problem, and the number of parts increased, resulting in an increase in cost.
本発明は上述した従来例の欠点を解消し、黒およびカラ
ーのトナーを用いる電子写真複写装置において、高画賀
化を図るためその画像濃度を適正な状態に維持する事が
できる画像濃度の検知方法を提供することを目的とする
。The present invention solves the above-mentioned drawbacks of the conventional example, and enables image density detection to maintain an appropriate image density in order to achieve high image density in an electrophotographic copying apparatus that uses black and color toners. The purpose is to provide a method.
そのために本発明は黒トナーを検知する受光角をθＦ（
ＢＫ）、カラートナーを検知する受光角をθＰ （ｃ
ｔ、）としたとき、
θＰ（ＢＫ）＜θＦ （ＣＬ）
という条件を満たすことを特徴とする。For this purpose, the present invention changes the light receiving angle for detecting black toner to θF(
BK), the acceptance angle for detecting color toner is θP (c
t, ), it is characterized by satisfying the condition θP(BK)<θF(CL).
以下、本発明の各実施例を図面に基づき説明する。Hereinafter, each embodiment of the present invention will be described based on the drawings.
第１図は第１の実施例に係るフォトセンサ組立体に関し
、（ａｌは平面図、（ｂ）は２つの受光角を示す図、第
２図は検知回路図、第３図、第４図はそれぞれ第２．第
３の実施例に係る第１図同様の図であり、（ａ）は平面
図、（ｂ）は２つの受光角を示す図、第５図は濃度検知
のフローチャートである。FIG. 1 relates to the photosensor assembly according to the first embodiment, (al is a plan view, (b) is a diagram showing two light receiving angles, FIG. 2 is a detection circuit diagram, and FIGS. 3 and 4). are diagrams similar to Figure 1 according to the second and third embodiments, where (a) is a plan view, (b) is a diagram showing two light receiving angles, and Figure 5 is a flowchart of concentration detection. .
まず第１図は発光素子１つと受光素子２つを用いた例で
ある。First, FIG. 1 shows an example using one light emitting element and two light receiving elements.
フォトセンサのホルダ（センサ組立体）５に組み込んだ
無指向性発光素子１と指向性受光素子２の組を（Ａ）、
無指向性発光素子１と指向性受光素子３の組を（Ｉ３）
とする、４はホルダ５の上面に設けた防塵ガラスであり
、感光体面６のトナーが発光素子１、受光素子２．３に
付着するのを防ぐ。A set of an omnidirectional light emitting element 1 and a directional light receiving element 2 assembled in a photosensor holder (sensor assembly) 5 is shown in (A).
A set of omnidirectional light emitting element 1 and directional light receiving element 3 (I3)
A dustproof glass 4 is provided on the upper surface of the holder 5 to prevent toner on the photoreceptor surface 6 from adhering to the light emitting element 1 and the light receiving element 2.3.
図に示すように、（Ａ）、 （Ｂ）の受光角をそれぞ
れθＦ（Ａ）、 θＰ （Ｂ）とすると、本発明で
はθＰ（Ａ）＜θＰ（Ｂ）を満足するように設ける。こ
の時の発光素子ｌと受光素子のなす角度θＰ（Ａ）は５
０度前後と小さく、発光素子１と受光素子３のなす角度
θＰ （Ｂ）は１２０度前後と大きくしである。これ
により黒トナーは受光素子２で、カラートナーは受光素
子３で各々の制御か可能になる。As shown in the figure, assuming that the light receiving angles of (A) and (B) are θF(A) and θP(B), respectively, the present invention is provided so that θP(A)<θP(B) is satisfied. At this time, the angle θP(A) between the light emitting element l and the light receiving element is 5
The angle θP (B) between the light emitting element 1 and the light receiving element 3 is small, around 0 degrees, and is large, around 120 degrees. As a result, black toner can be controlled by the light receiving element 2, and color toner can be controlled by the light receiving element 3.
すなわち、θＰ（Ａ）を黒トナー用としてθ。That is, θ is set as θP(A) for black toner.
（ＢＫ）と表すと、θＰ （ＢＫ）’１５０度、θ。When expressed as (BK), θP (BK)'150 degrees, θ.
（Ｂ）をカラートナー用としてθＰ （ＣＬ）と表す
とθＦ（ＣＬ）ζ１２０度となる。When (B) is expressed as θP (CL) for color toner, it becomes θF(CL)ζ120 degrees.
黒トナー濃度およびカラートナー濃度は第２図に示す回
路において、抵抗Ｒｔ、Ｒｚを調整することにより初期
設定される。そしてその後、フォトセンサ（Ａ）、
（Ｂ）で実際に検出した出力（Ａ・０ＵＴＳＢ・０ＵＴ
）をＣＰＵ７に取り込み演蒐して制御信号を出力する。The black toner density and the color toner density are initialized by adjusting the resistors Rt and Rz in the circuit shown in FIG. And after that, the photosensor (A),
The output actually detected in (B) (A・0UTSB・0UT
) is taken into the CPU 7, deduced, and outputs a control signal.
この際センサ（Ａ）の出力とセンサ（Ｂ）の出力は第５
図のフローチャートの３５（ステップ５）、３６（ステ
ップ６）に示すようにタイミングをずらして検知される
。尚、この時正反射光を検知するために受光部に指向性
を強（するように、スリットを設けるのと同時に１つの
発光素子から照射した正反射光が２つの受光素子で検知
されるように発光部では指向性を持たないように光路を
広（する。At this time, the output of sensor (A) and the output of sensor (B) are
As shown in 35 (step 5) and 36 (step 6) of the flowchart in the figure, the detection is performed at different timings. At this time, in order to detect the specularly reflected light, a slit is provided in the light receiving section so that the specularly reflected light emitted from one light emitting element is detected by two light receiving elements. In the light emitting section, the optical path is widened so that it does not have directivity.
第３図に示す第２の実施例は複数の発光素子１゜７とｌ
個の受光素子３を設けた例であり、発光素子７と受光素
子３で（Ａ）を、発光素子１と受光素子３で（Ｂ）を構
成する。この場合は発光素子側を指向性とする。The second embodiment shown in FIG.
This is an example in which the light-emitting element 7 and the light-receiving element 3 constitute (A), and the light-emitting element 1 and the light-receiving element 3 constitute (B). In this case, the light emitting element side is made directional.
また第４図に示す第３の実施例は、複数の発光素子１．
７及び複数の受光素子３．８を設けた例であり、発光素
子７と受光素子３で（Ａ）を、発光素子ｌと受光素子８
で（Ｂ）を構成する。この場合は発光素子側、受光素子
側とも指向性とする。Further, in the third embodiment shown in FIG. 4, a plurality of light emitting elements 1.
7 and a plurality of light receiving elements 3.8, the light emitting element 7 and the light receiving element 3 are shown in (A), and the light emitting element 1 and the light receiving element 8 are
Construct (B). In this case, both the light emitting element side and the light receiving element side are directional.
本発明は以上述べた通りのものであり、本発明に係る画
像濃度の検知方法によれば、１つのフォルダに黒トナー
用とカラートナー用のフォトセンサを取り付けることに
より、小型軽量化、省スペース化、コストダウンを図る
ことができる。The present invention is as described above, and according to the image density detection method according to the present invention, by attaching photosensors for black toner and color toner to one folder, it is possible to reduce the size and weight and save space. It is possible to reduce costs.
第１図は第１の実施例に係るフォトセンサ組立体に関し
、（ａｌは平面図、（ｂ）は２つの受光角を示す図、第
２図は検知回路図、第３図、第４図はそれぞれ第２．第
３の実施例に係る第１図同様の図であり、ｔａｌは平面
図、（′ｂ）は２つの受光角を示す図、第５図は１貫検
知のフローチャートである。
５・・・フォトセンサ組立体。
第１図
第２図FIG. 1 relates to the photosensor assembly according to the first embodiment, (al is a plan view, (b) is a diagram showing two light receiving angles, FIG. 2 is a detection circuit diagram, and FIGS. 3 and 4). are the same diagrams as in FIG. 1 according to the second and third embodiments, tal is a plan view, ('b) is a diagram showing two light receiving angles, and FIG. 5 is a flowchart of one-piece detection. 5... Photo sensor assembly. Figure 1 Figure 2
Claims (5)
ナーの付着量を光学的に検知するフォトセンサ組立体に
おいて、発光素子、受光素子の何れか一方あるいは両方
を複数にすることによつて、２つの受光角θ＿Ｐを形成
し、黒トナーを検知する受光角をθ＿Ｐ（ＢＫ）、カラ
ートナーを検知する受光角をθ＿Ｐ（ＣＬ）としたとき
、 θ＿Ｐ（ＢＫ）＜θ＿Ｐ（ＣＬ） という条件を満たすことを特徴とする画像濃度の検知方
法。(1) In a photosensor assembly that optically detects the amount of particulate toner adhering to a photoreceptor in order to control image density, it is possible to use a plurality of light-emitting elements, light-receiving elements, or both. Therefore, when two light-receiving angles θ_P are formed, and the light-receiving angle for detecting black toner is θ_P(BK) and the light-receiving angle for detecting color toner is θ_P(CL), θ_P(BK)<θ_P(CL). An image density detection method characterized by satisfying the following conditions.
数の受光素子からなることを特徴とする特許請求の範囲
第（１）項記載の画像濃度の検知方法。(2) The method for detecting image density according to claim (1), wherein the combination of light emitting and light receiving elements comprises a single light emitting element and a plurality of light receiving elements.
数の受光素子からなることを特徴とする特許請求の範囲
第（１）項記載の画像濃度の検知方法。(3) The method for detecting image density according to claim (1), wherein the combination of light emitting and light receiving elements comprises a plurality of light emitting elements and a single light receiving element.
数の受光素子からなることを特徴とする特許請求の範囲
第（１）項記載の画像濃度の検知方法。(4) The image density detection method according to claim (1), wherein the combination of light emitting and light receiving elements includes a plurality of light emitting elements and a plurality of light receiving elements.
るか、もしくは受光部光路にスリットを設けることを特
徴とする特許請求の範囲第（１）項記載の画像濃度の検
知方法。(5) The method for detecting image density according to claim (1), characterized in that a non-directional light-emitting element and a directional light-receiving element are used, or a slit is provided in the light path of the light-receiving section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62140061A JP2702480B2 (en) | 1987-06-05 | 1987-06-05 | Photo sensor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62140061A JP2702480B2 (en) | 1987-06-05 | 1987-06-05 | Photo sensor device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63304281A true JPS63304281A (en) | 1988-12-12 |
| JP2702480B2 JP2702480B2 (en) | 1998-01-21 |
Family
ID=15260070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62140061A Expired - Lifetime JP2702480B2 (en) | 1987-06-05 | 1987-06-05 | Photo sensor device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2702480B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5107302A (en) * | 1988-10-28 | 1992-04-21 | Ricoh Company, Ltd. | Image density control device for an image forming apparatus |
| US6674988B2 (en) | 2001-01-31 | 2004-01-06 | Sharp Kabushiki Kaisha | Toner misregistration detection sensor, color image-forming apparatus using the same, and method for toner misregistration detection |
| US7676169B2 (en) * | 2006-05-22 | 2010-03-09 | Lexmark International, Inc. | Multipath toner patch sensor for use in an image forming device |
| WO2013065731A1 (en) * | 2011-10-31 | 2013-05-10 | 京セラ株式会社 | Sensor device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55162253U (en) * | 1979-05-07 | 1980-11-21 | ||
| JPS61209470A (en) * | 1985-03-13 | 1986-09-17 | Minolta Camera Co Ltd | Toner concentration detector |
-
1987
- 1987-06-05 JP JP62140061A patent/JP2702480B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55162253U (en) * | 1979-05-07 | 1980-11-21 | ||
| JPS61209470A (en) * | 1985-03-13 | 1986-09-17 | Minolta Camera Co Ltd | Toner concentration detector |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5107302A (en) * | 1988-10-28 | 1992-04-21 | Ricoh Company, Ltd. | Image density control device for an image forming apparatus |
| US6674988B2 (en) | 2001-01-31 | 2004-01-06 | Sharp Kabushiki Kaisha | Toner misregistration detection sensor, color image-forming apparatus using the same, and method for toner misregistration detection |
| US7676169B2 (en) * | 2006-05-22 | 2010-03-09 | Lexmark International, Inc. | Multipath toner patch sensor for use in an image forming device |
| WO2013065731A1 (en) * | 2011-10-31 | 2013-05-10 | 京セラ株式会社 | Sensor device |
| JPWO2013065731A1 (en) * | 2011-10-31 | 2015-04-02 | 京セラ株式会社 | Sensor device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2702480B2 (en) | 1998-01-21 |
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