JPH023080A - Optical print head - Google Patents
Optical print headInfo
- Publication number
- JPH023080A JPH023080A JP88150444A JP15044488A JPH023080A JP H023080 A JPH023080 A JP H023080A JP 88150444 A JP88150444 A JP 88150444A JP 15044488 A JP15044488 A JP 15044488A JP H023080 A JPH023080 A JP H023080A
- Authority
- JP
- Japan
- Prior art keywords
- array
- emitting diode
- light emitting
- light
- diode array
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 18
- 238000003384 imaging method Methods 0.000 claims description 16
- 108091008695 photoreceptors Proteins 0.000 claims description 11
- 238000003491 array Methods 0.000 abstract 2
- 230000007547 defect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 241000519995 Stachys sylvatica Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000004397 blinking Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、光プリントヘッド、特に発光ダイオードアレ
イの故障検出機能を有する光プリントヘッドに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical print head, and particularly to an optical print head having a failure detection function of a light emitting diode array.
感光体に電気潜像を形成する発光ダイオードアレイは通
常的２４０個／１インチまたはそれ以上の発光ダイオー
ド素子がおよそ８インチから［５インチの長さに整列さ
れており、画像信号に応じて各素子を点滅させて感光体
に画像の電気潜像を形成するのであるが、この場合発光
ダイオード素子に１個でも不良が生ずるとこの素子に対
応する画像部分にいわゆる黒筋（正規現像の場合）また
は白抜け（反転現像の場合）が生じ印刷不良となる。こ
のため、早期に故障素子を発見することが重要で、従来
は印刷サンプルを作成しこれから黒筋や白抜は等の印刷
不良を目視によって検査する方法が用いられていた。A light emitting diode array that forms an electrical latent image on a photoreceptor typically has 240 or more light emitting diode elements per inch arranged in a length of approximately 8 to 5 inches, each of which responds to an image signal. An electrical latent image of the image is formed on the photoreceptor by blinking the element, but in this case, if even one defective light emitting diode element occurs, a so-called black streak will appear in the image area corresponding to this element (in the case of regular development). Alternatively, white spots (in the case of reversal development) may occur, resulting in printing defects. For this reason, it is important to discover faulty elements at an early stage. Conventionally, a method has been used in which a print sample is prepared and then visually inspected for printing defects such as black streaks and white spots.
上述したように発光ダイオードアレイを構成する素子に
故障を生じた場合は直ちに印刷不良となるので例え１個
でも早急に検出しなければならないが、従来は目視によ
る検査法を用いていたため印刷不良の原因が発光ダイオ
ード素子の欠陥によるものか現像装置や感光体など他か
の要因によるものか１判別できない嫌いがあった。As mentioned above, if a failure occurs in the elements that make up the light emitting diode array, it will immediately result in a printing defect, so even one defect must be detected as soon as possible. It was difficult to determine whether the cause was a defect in the light emitting diode element or another factor such as the developing device or photoreceptor.
本発明の目的は１発光ダイオード素子の故障を容易に発
見できる光プリントヘッドを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an optical print head in which failure of one light emitting diode element can be easily detected.
本発明は、印字情報に応じて発光する発光ダイオードア
レイと短焦点結像素子アレイとを具え、前記発光ダイオ
ードアレイの光を前記短焦点結像素子アレイを介して感
光体に投射して静電潜像を形成する光プリントヘッドに
おいて、前記発光ダイオードアレイと前記短焦点結像素
子アレイとの間に半透明反射鏡が設けられ、この半透明
反射鏡を通過する光を書込用として前記短焦点結像素子
アレイを通して前記感光体に前記静電潜像を形成する光
路と、前記半透明反射鏡より反射される光をチェック用
として分岐光学系に設けられた短焦点結像素子アレイお
よびホトセンサアレイに投射し、このホトセンサアレイ
の出力信号により前記発光ダイオードアレイの故障の有
無を検知する光路とを有するもので、発光ダイオードア
レイとホトセンサアレイの各素子とを対応させ、これら
を同時に動作させることにより目的の達成を計っている
。The present invention includes a light emitting diode array and a short focus imaging element array that emit light according to printed information, and projects light from the light emitting diode array onto a photoreceptor via the short focus imaging element array to generate an electrostatic charge. In an optical print head that forms a latent image, a semi-transparent reflector is provided between the light emitting diode array and the short focus imaging element array, and the light passing through the semi-transparent reflector is used for writing. An optical path for forming the electrostatic latent image on the photoreceptor through a focusing imaging element array, and a short focusing imaging element array and a photoconductor provided in a branching optical system for checking the light reflected from the semi-transparent reflecting mirror. The light emitting diode array is projected onto a sensor array, and has an optical path for detecting the presence or absence of a failure in the light emitting diode array based on the output signal of the photosensor array. By operating it, we aim to achieve our goals.
本発明の光プリントヘッドでは半透明反射鏡が一つの光
を透過光と反射光とに分割する性質を利用し、これを発
光ダイオードアレイと短焦点結像素子アレイとの間に設
け１発光ダイオードアレイの投射光のうち透過光を感光
体に静電潜像を形成する書込み光として用い、他方の反
射光を発光ダイオードアレイの各素子と対応して動作す
るホトセンサアレイに入射させてその出力で発光ダイオ
ードアレイの良否を判別するようにしであるので一方の
透過光で印刷を行なうと同時に他方の反射光で発光ダイ
オードアレイ素子の動作を常にチェックすることが可能
となり、サンプル印刷によるチェック作業が不要で作業
効率を上昇させることができる。The optical print head of the present invention takes advantage of the property of a semi-transparent reflector to split one light into transmitted light and reflected light, and is provided between a light emitting diode array and a short focus imaging element array to form one light emitting diode. Of the light projected from the array, the transmitted light is used as writing light to form an electrostatic latent image on the photoreceptor, and the other reflected light is made incident on a photo sensor array that operates in correspondence with each element of the light emitting diode array to output its output. Since the quality of the light emitting diode array is determined by using the light emitting diode array, it is possible to perform printing using one transmitted light while simultaneously checking the operation of the light emitting diode array element using the other reflected light, making it possible to check the operation of the light emitting diode array element by printing samples. This is not necessary and can improve work efficiency.
以下、本発明の一実施例について図を用いて説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明の光プリントヘッドの一実施例を示す斜
視図、第２図は側面図である。FIG. 1 is a perspective view showing an embodiment of the optical print head of the present invention, and FIG. 2 is a side view.
これらの図において１は感光体、２は発光ダイオードア
レイ、３は書込用の短焦点結像素子アレイ、４はチェッ
ク用の短焦点結像素子アレイ、５は半透明反射鏡、６は
ホトセンサアレイを示す。In these figures, 1 is a photoreceptor, 2 is a light emitting diode array, 3 is a short focus imaging element array for writing, 4 is a short focus imaging element array for checking, 5 is a translucent reflecting mirror, and 6 is a photoreceptor. A sensor array is shown.
半透明反射［５の透過側の面をＡ１反射側の面をＢとす
ると、発光ダイオードアレイ２から出た光は一方は半透
明反射ｊ！５のＡ面より短焦点結像素子アレイ３を通っ
て感光体１に静電潜像を結像させ、他方は半透明反射鏡
５のＢ面で反射して短焦点結像素子アレイ４を通ってホ
トセンサアレイ６に入射するので、ホトセンサアレイ６
の出力をチェックすることにより、発光ダイオードアレ
イ２の発光状態の良否、すなわち発光素子の故障の有無
をチェックすることが可能となり、同時に印刷状態の良
否をチェックすることができる。Semi-transparent reflection [If the transmission side surface of [5 is A1 and the reflection side surface is B, one side of the light emitted from the light emitting diode array 2 is semi-transparent reflection j! An electrostatic latent image is formed on the photoreceptor 1 from the A side of the translucent mirror 5 through the short focus imaging element array 3, and the other electrostatic latent image is reflected by the B side of the semi-transparent reflecting mirror 5 to form the short focus imaging element array 4. and enters the photo sensor array 6, so the photo sensor array 6
By checking the output of the light emitting diode array 2, it is possible to check whether the light emitting state of the light emitting diode array 2 is good, that is, whether there is a failure of the light emitting elements, and at the same time, it is possible to check whether the printing state is good or bad.
以上述べたように本発明によれば次のような効果が得ら
れる。As described above, according to the present invention, the following effects can be obtained.
（１）簡単な手段により一つの光を分岐し一方は印刷に
使用し他方は発光素子の故障のチェックに用いることが
できるので印刷の信頼性を向上することができる。(1) By simple means, one light can be branched, one of which can be used for printing, and the other can be used to check for malfunctions in the light emitting elements, thereby improving the reliability of printing.
（２）サンプル印刷や目視検査等を行なう必要がなく、
装置の稼動効果を大幅に向上することができる。(2) There is no need to perform sample printing or visual inspection, etc.
The operating effect of the device can be greatly improved.
第１図は本発明の光プリントヘッドの一実施例を示す斜
視図、第２図は第１図の側面図である。
１は感光体、２は発光ダイオードアレイ、３．４は短焦
点結像素子アレイ、５は半透明反射鏡、６はセンサ用ホ
トアレイ。FIG. 1 is a perspective view showing an embodiment of the optical print head of the present invention, and FIG. 2 is a side view of FIG. 1. 1 is a photoreceptor, 2 is a light emitting diode array, 3.4 is a short focus imaging element array, 5 is a translucent reflector, and 6 is a photo array for a sensor.
Claims (1)
短焦点結像素子アレイとを具え、前記発光ダイオードア
レイの光を前記短焦点結像素子アレイを介して感光体に
投射して静電潜像を形成する光プリントヘッドにおいて
、前記発光ダイオードアレイと前記短焦点結像素子アレ
イとの間に半透明反射鏡が設けられ、該半透明反射鏡を
通過する光を書込用として前記短焦点結像素子アレイを
通して前記感光体に前記静電潜像を形成する光路と、前
記半透明反射鏡より反射される光をチェック用として分
岐光学系に設けられた短焦点結像素子アレイおよびホト
センサアレイに投射し、該ホトセンサアレイの出力信号
により前記発光ダイオードアレイの故障の有無を検知す
る光路とを有することを特徴とする光プリントヘッド ２、前記発光ダイオードアレイの各素子と前記ホトセン
サアレイの各素子とはそれぞれが相対応して動作する如
く配列されている特許請求の範囲第１項記載の光プリン
トヘッド。[Claims] 1. A light emitting diode array that emits light in accordance with printed information and a short focus imaging element array, the light from the light emitting diode array being projected onto a photoreceptor via the short focus imaging element array. In the optical print head that forms an electrostatic latent image using a semi-transparent reflective mirror, a semi-transparent reflective mirror is provided between the light emitting diode array and the short focus imaging element array, and light passing through the semi-transparent reflective mirror is written. an optical path for forming the electrostatic latent image on the photoconductor through the short focus imaging element array for use, and a short focus imaging element provided in the branching optical system for checking the light reflected from the semitransparent reflecting mirror. An optical print head 2, characterized in that it has an optical path for projecting onto a child array and a photosensor array, and detecting whether or not there is a failure in the light emitting diode array based on an output signal of the photosensor array, and each element of the light emitting diode array. 2. The optical print head according to claim 1, wherein the elements of the photosensor array and the elements of the photosensor array are arranged so as to operate in correspondence with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP88150444A JPH023080A (en) | 1988-06-17 | 1988-06-17 | Optical print head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP88150444A JPH023080A (en) | 1988-06-17 | 1988-06-17 | Optical print head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH023080A true JPH023080A (en) | 1990-01-08 |
Family
ID=15497069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP88150444A Pending JPH023080A (en) | 1988-06-17 | 1988-06-17 | Optical print head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH023080A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0663662A2 (en) * | 1994-01-13 | 1995-07-19 | Toshinobu Futagawa | Optical head unit |
| US5638896A (en) * | 1994-02-03 | 1997-06-17 | Nippon Sanso Corporation | Cold-hot storage box with inert gas insulating jacket |
| JP2010120261A (en) * | 2008-11-19 | 2010-06-03 | Fuji Xerox Co Ltd | Exposure device, light emitting device, and image forming apparatus |
-
1988
- 1988-06-17 JP JP88150444A patent/JPH023080A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0663662A2 (en) * | 1994-01-13 | 1995-07-19 | Toshinobu Futagawa | Optical head unit |
| EP0663662A3 (en) * | 1994-01-13 | 1995-08-09 | Futagawa Toshinobu | |
| US5638896A (en) * | 1994-02-03 | 1997-06-17 | Nippon Sanso Corporation | Cold-hot storage box with inert gas insulating jacket |
| JP2010120261A (en) * | 2008-11-19 | 2010-06-03 | Fuji Xerox Co Ltd | Exposure device, light emitting device, and image forming apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1049925B1 (en) | Optical inspection method and apparatus | |
| US6239828B1 (en) | Image formation device for forming a color image composed of plural colors | |
| KR920005759A (en) | Diagnostic device of light emitting array | |
| JPH023080A (en) | Optical print head | |
| JPH11304724A (en) | Device and method for inspecting hole of light-transmission sheet | |
| US4652125A (en) | Film inspection system | |
| US4687943A (en) | Optical motion picture film inspection system | |
| US4652124A (en) | Film inspection system | |
| JP2002139439A (en) | Diffused light source for inspection | |
| JP3347542B2 (en) | Concentration sensor | |
| JP3409272B2 (en) | Foreign matter inspection method of exposure mask | |
| JPH09105724A (en) | Surface inspection device | |
| JP2003083902A (en) | Method and device for inspecting specimen | |
| US6208366B1 (en) | Optical head having function of detecting positional displacement of photosensitive member and electrophotographic image forming apparatus employing the same | |
| JPH03126967A (en) | Electrophotographic device | |
| JPH10217539A (en) | Method for inspecting light amount characteristic of scan light beam of image-recording apparatus | |
| JPS59117856A (en) | Anomalous detector for picture recording device | |
| JP3535696B2 (en) | Image forming apparatus and printer | |
| JPH1062704A (en) | Optical scanner | |
| JPH10132704A (en) | Optical inspection device | |
| JP3391888B2 (en) | Light reflection type sensor and its detection method | |
| US6888561B2 (en) | Beam control device | |
| JPS6243675A (en) | Toner concentration detecting device | |
| JPH01171947A (en) | Laser recording apparatus | |
| JPH09185191A (en) | Toner concentration detector and image forming device provided with the same |