JPH0262257A - Led print head - Google Patents

Led print head

Info

Publication number
JPH0262257A
JPH0262257A JP63214368A JP21436888A JPH0262257A JP H0262257 A JPH0262257 A JP H0262257A JP 63214368 A JP63214368 A JP 63214368A JP 21436888 A JP21436888 A JP 21436888A JP H0262257 A JPH0262257 A JP H0262257A
Authority
JP
Japan
Prior art keywords
led
amount
emission
drive
dot
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
JP63214368A
Other languages
Japanese (ja)
Inventor
Yoshihiro Ogawa
小川　義広
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.)
Niigata Fuji Xerox Manufacturing Co Ltd
Original Assignee
Niigata Fuji Xerox Manufacturing 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 Niigata Fuji Xerox Manufacturing Co Ltd filed Critical Niigata Fuji Xerox Manufacturing Co Ltd
Priority to JP63214368A priority Critical patent/JPH0262257A/en
Publication of JPH0262257A publication Critical patent/JPH0262257A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

PURPOSE:To make the amount of emission of each dot of LED uniform and thereby to eliminate the occurrence of nonuniformity in density appearing in a print, by providing an LED drive timing control element which controls a drive time of each LED on the basis of the nonuniformity in the amount of the emission of each dot of the LED. CONSTITUTION:An LED print head has a lined-up LED array 4, an image data receiving element 3, an LED drive timing control element 2 and an LED driving element 1. The nonuniformity in the amount of emission of each dot of LED is classified beforehand, and the drive timing control element 2 is connected to an AND gate input terminal (a) of the LED driving element 1 through any one of drive lines A to C selected in accordance of a classification value. Thereby the drive timing control element 2 outputs to the LED driving element 1 an instruction to control a drive time to be long for LED connected thereto and having a small amount of emission and to be short for LED connected thereto and having a large amount of emission, and based on said instruction, each LED dot is driven in the LED driving element 1, so as to make the amount of emission uniform.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はＬＥＤプリントヘッドに関し、特に印字画像に
影響を及ぼすＬＥＤ発光光量均一化を図る回路に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an LED print head, and more particularly to a circuit for uniformizing the amount of light emitted from the LEDs, which affects printed images.

〔従来の技術〕[Conventional technology]

従来、この種のＬＥＤアレイ発光光量の均一化を実現す
るにあたっては、ＬＥＤ電流制限抵抗のトリミングによ
り、ＬＥＤアレイ間の平均光量を均一化していた。Conventionally, in order to achieve uniformity in the amount of light emitted by this type of LED array, the average amount of light between the LED arrays was made uniform by trimming the LED current limiting resistor.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の電流制限紙、抗のトリミングは整列され
たＬＥＤアレイ間の平均光量の均一化であって、各ドツ
ト間の均一化ではなかった。そのために、各ドツト間の
発光光量のバラツキが大きくなった場合には、これによ
る印字品質の濃度ムラが発生するという欠点がある。The above-mentioned conventional current-limiting paper and trimming are aimed at making the average light intensity between the aligned LED arrays uniform, but not between each dot. For this reason, if there is a large variation in the amount of light emitted between each dot, there is a drawback that density unevenness in print quality will occur due to this.

また、前記トリミングによる方法をＬＥＤ各ドツト単位
に実施した場合には回路規模が大きくなり、コスト的に
は有効でなかった。Furthermore, if the trimming method was applied to each LED dot, the circuit size would increase, and this would not be effective in terms of cost.

本発明の目的は前記課題を解決したＬＥＤプリントヘッ
ドを提供することにある。An object of the present invention is to provide an LED print head that solves the above problems.

〔課題を解決するための手段〕[Means to solve the problem]

前記目的を達成するため１本発明に係るＬＥＤプリント
ヘッドにおいては、整列されたＬＥＤアレイと、該ＬＥ
Ｄアレイを駆動するＬＥＤ駆動部と、ＬＥＤ各ドツト毎
の発光光量バラツキに基づいて各ＬＥＤの駆動時間を制
御する指令を前記ＬＥＤ駆動部に発するＬＥＤ駆動タイ
ミング制御部とを有するものである。In order to achieve the above object, an LED print head according to the present invention includes an array of aligned LEDs, and an LED print head according to the present invention.
It has an LED drive section that drives the D array, and an LED drive timing control section that issues a command to the LED drive section to control the drive time of each LED based on the variation in the amount of light emitted from each LED dot.

〔実施例〕〔Example〕

以下、本発明の一実施例を図により説明する。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

第１図は本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.

図において、本発明のＬＥＤプリントヘッドは、整列さ
れたＬＥＤアレイ４と、画像データ受信部３と、ＬＥＤ
駆動タイミング制御部２と、ＬＥＤ駆動部１とを有して
いる。In the figure, the LED print head of the present invention includes an aligned LED array 4, an image data receiving section 3, and an LED print head.
It has a drive timing control section 2 and an LED drive section 1.

画像データ受信部３は−ライン分ずつ画像データを受信
し、ＬＥＤの０Ｎ１０ＦＦ情報を出力する。駆動タイミ
ング制御部２は、各ドライブ線Ａ、Ｂ、ＣにＬＥＤ分類
値に応じたドライブ信号を発生させ、ドライブ時間の制
御を行う。The image data receiving section 3 receives image data for each - line and outputs 0N10FF information of the LED. The drive timing control section 2 generates a drive signal to each of the drive lines A, B, and C according to the LED classification value, and controls the drive time.

実施例において、予めＬＥＤ各ドツト毎の発光光量バラ
ツキを分類しておき、駆動タイミング制御部２はＬＥＤ
駆動部１のＡＮＤゲート入力入力端子前記分類値に応じ
てドライブ線Ａ、Ｂ、Ｃのいずれかを選択して接続する
。これによって、駆動タ不ミング制御部２は発光光量が
低いものが接続されたＬＥＤに対してはドライブ時間を
長くし、また発光光量が高いものが接続されたＬＥＤに
対してはドライブ時間を短く制御する指令をＬＥＤ駆動
部１に出力し、ＬＥＤ駆動部１にてその指令に基づき各
ＬＥＤ　ドツトを駆動させ、光量の均一化を図る。In the embodiment, the variation in the amount of light emitted by each LED dot is classified in advance, and the drive timing control section 2
The AND gate input input terminal of the drive unit 1 selects and connects one of the drive lines A, B, and C according to the classification value. As a result, the drive timing control unit 2 lengthens the drive time for an LED connected to a low light emission amount, and shortens the drive time for an LED connected to a high light emission amount. A control command is output to the LED drive unit 1, and the LED drive unit 1 drives each LED dot based on the command to equalize the amount of light.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明はＬＥＤ各ドツト毎の発光光
量を均一化することによって、印字上に現われる濃度ム
ラの発生をなくすことができ、高品質の印字結果を得る
ことができる効果がある。As explained above, the present invention has the effect of making it possible to eliminate density unevenness that appears on printing by making the amount of light emitted from each LED dot uniform, thereby making it possible to obtain high-quality printing results.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示すブロック図である。 １・・・ＬＥＤ駆動部 ２・・・ＬＥＤ駆動タイミング制御部 ３・・・画像データ受信部　　　４・・・ＬＥＤアレイ
特許出願人　　新潟日本電気株式会社FIG. 1 is a block diagram showing one embodiment of the present invention. 1... LED drive section 2... LED drive timing control section 3... Image data reception section 4... LED array patent applicant Niigata NEC Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] （１）整列されたＬＥＤアレイと、該ＬＥＤアレイを駆
動するＬＥＤ駆動部と、ＬＥＤ各ドット毎の発光光量バ
ラツキに基づいて各ＬＥＤの駆動時間を制御する指令を
前記ＬＥＤ駆動部に発するＬＥＤ駆動タイミング制御部
とを有することを特徴とするＬＥＤプリントヘッド。(1) The aligned LED array, an LED drive unit that drives the LED array, and an LED drive that issues a command to the LED drive unit to control the drive time of each LED based on the variation in the amount of light emitted by each LED dot. An LED print head comprising: a timing control section.
JP63214368A 1988-08-29 1988-08-29 Led print head Pending JPH0262257A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63214368A JPH0262257A (en) 1988-08-29 1988-08-29 Led print head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63214368A JPH0262257A (en) 1988-08-29 1988-08-29 Led print head

Publications (1)

Publication Number Publication Date
JPH0262257A true JPH0262257A (en) 1990-03-02

Family

ID=16654631

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63214368A Pending JPH0262257A (en) 1988-08-29 1988-08-29 Led print head

Country Status (1)

Country Link
JP (1) JPH0262257A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124038A1 (en) * 1990-07-19 1992-01-23 Futaba Denshi Kogyo Kk Print head used with photosensitive drum - has fluorescent tube with matrix of light emitting points served by corrected values held in ROM
JP2008296443A (en) * 2007-05-31 2008-12-11 Kyocera Corp Optical printing head correcting method, optical printing head, and image forming device
JP2010194928A (en) * 2009-02-26 2010-09-09 Kyocera Corp Optical printer head, image forming apparatus, and method for driving optical printer head
US7804513B2 (en) 2003-11-05 2010-09-28 Ricoh Company, Ltd. Optical writing unit, image forming apparatus, process cartridge, and method of adjusting light intensity

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124038A1 (en) * 1990-07-19 1992-01-23 Futaba Denshi Kogyo Kk Print head used with photosensitive drum - has fluorescent tube with matrix of light emitting points served by corrected values held in ROM
DE4124038B4 (en) * 1990-07-19 2006-07-13 Futaba Denshi Kogyo K.K., Mobara Stylus for a printing device
US7804513B2 (en) 2003-11-05 2010-09-28 Ricoh Company, Ltd. Optical writing unit, image forming apparatus, process cartridge, and method of adjusting light intensity
JP2008296443A (en) * 2007-05-31 2008-12-11 Kyocera Corp Optical printing head correcting method, optical printing head, and image forming device
JP2010194928A (en) * 2009-02-26 2010-09-09 Kyocera Corp Optical printer head, image forming apparatus, and method for driving optical printer head

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