JPS61180262A - Image recording device - Google Patents
Image recording deviceInfo
- Publication number
- JPS61180262A JPS61180262A JP2127485A JP2127485A JPS61180262A JP S61180262 A JPS61180262 A JP S61180262A JP 2127485 A JP2127485 A JP 2127485A JP 2127485 A JP2127485 A JP 2127485A JP S61180262 A JPS61180262 A JP S61180262A
- Authority
- JP
- Japan
- Prior art keywords
- light
- led
- application time
- light emitting
- image recording
- 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
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
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/32—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head
- G03G15/326—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by application of light, e.g. using a LED array
-
- 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
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/04036—Details of illuminating systems, e.g. lamps, reflectors
- G03G15/04045—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers
- G03G15/04054—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers by LED arrays
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、ファクシミリ等に使用される電子写真方式の
画像記録装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrophotographic image recording device used in facsimiles and the like.
従来の技術
従来の画像記録装置を第４図に示す。この画像記録装置
は、複数のＬＥＤ （発光ダイオード）より形成嘔れた
Ｌ４Ｉ）アレイ２と、ＬＩＣＩ）アレイ２と光学的に配
置１れ、ＬＥＤの照射により潜像を２ ・・
形成する感光体ドラム６と、ＬＥＤを発光きせる印加電
流を出力する駆動回路１と、駆動回路１の印加電流を制
御する補正回路３と、ＬＥＤアレイ２の光を受けて補正
回路３での補正条件を決定する受光素子４とより構成さ
ね−でいる。ＬＥＤアレイ２からの光を受光素子４で受
け、このデータを基に補正回路３で演算を行い、駆動回
路１に入力し、ＬＥＤアレイ２の電流印加時間を制御す
る〇印加時間は第５図に示すように、１４Ｄの発光量に
より印加時間を変化させ、発光量の大きいＬＥＤについ
ては第６図（ａ）に示すように１ドツト当りの印加時間
をｔｌとし、′！た発光量の小σいＬＥＤについては第
５図（ｂ）に示すように印加時間をｔ２とし、印加時間
ｔ１ より印加時間ｔ２を大きい値に設定している。2. Description of the Related Art A conventional image recording apparatus is shown in FIG. This image recording device includes a photoreceptor that is optically arranged with an L4I) array 2 formed by a plurality of LEDs (light emitting diodes) and a LICI) array 2, and forms a latent image by irradiation with the LEDs. A drum 6, a drive circuit 1 that outputs an applied current that causes the LED to emit light, a correction circuit 3 that controls the applied current of the drive circuit 1, and a correction condition for the correction circuit 3 determined by receiving light from the LED array 2. It is composed of a light receiving element 4. Light from the LED array 2 is received by the light receiving element 4, and based on this data, the correction circuit 3 performs calculations and inputs it to the drive circuit 1 to control the current application time of the LED array 2. The application time is shown in Figure 5. As shown in FIG. 6(a), the application time is changed depending on the amount of light emitted by the 14D, and for LEDs with a large amount of light emitted, the application time per dot is set to tl as shown in FIG. 6(a), and '! For the LED with a small amount of light emission, the application time is set to t2, as shown in FIG. 5(b), and the application time t2 is set to a value larger than the application time t1.
発明が解決しようとする問題点
しかし、この記録装置によると、発光量の大きいＬＥＤ
による光エネルギー分布人と、発光量の小１いＬＫＩ）
による光エネルギー分布Ｂに第６図に示す特性を有し、
１ドツトにおける総計の光工ネルギー量は均一になるが
、第６図で明らかなように副走査方向におけるド・ソト
の大きさに差を生じることになる。Problems to be Solved by the Invention However, according to this recording device, LEDs with a large amount of light emitted
Light energy distribution by people and LKI with a small amount of light emission)
The light energy distribution B has the characteristics shown in Fig. 6,
Although the total amount of optical energy for one dot is uniform, as is clear from FIG. 6, there is a difference in the magnitude of dots and soots in the sub-scanning direction.
本発明は、」−記問題点を解消するために為されたもの
で、ドツトの太きσに差を生じさせる事なく、ＬＥＤア
レイの光量補正を行うことができる画像記録装置を提供
することを目的とする。The present invention has been made in order to solve the problem mentioned above, and it is an object of the present invention to provide an image recording device that can correct the light amount of an LED array without causing a difference in the thickness σ of the dots. With the goal.
問題点を解決するための手段
本発明は、複数の発光ダイオードより形成された発光ダ
イオードアレイと、発光ダイオードアレイと光学的に配
置し、発光ダイオードの照射により潜像を形成する記録
媒体と、発光ダイオードを発光させる印加電流を発光ダ
イオードに出力する駆動回路とを有する画像記録装置に
あって、チョッパ制御回路を有し、駆動回路の印加電流
を制御する補正回路を有するものである。Means for Solving the Problems The present invention provides a light emitting diode array formed of a plurality of light emitting diodes, a recording medium that is optically arranged with the light emitting diode array and forms a latent image by irradiation with the light emitting diodes, and a recording medium that emits light. The image recording apparatus includes a drive circuit that outputs an applied current to the light emitting diode to cause the diode to emit light, and includes a chopper control circuit and a correction circuit that controls the applied current of the drive circuit.
作用
補正回路にチョッパ制御回路を用いることにより、発光
ダイオードの発光量に応じて印加電流の通電を複数のパ
ルス状の印加時間で断続して行うため、ドツトの犬＠を
に差を生じさせる事なく、光量補正を行える。By using a chopper control circuit in the effect correction circuit, the applied current is applied intermittently at multiple pulse-like application times depending on the amount of light emitted from the light emitting diode, which makes it possible to cause differences in the dots. Light amount correction can be performed without any problems.
実施例
第１図、第２図を基に本発明の一実施例による画像記録
装置について説明する。第１図は本発明の一実施例によ
る画像記録装置のブロック図、第２図は第１図に示す画
像記録装置のＬＥＤ駆動電流印加タイミング図である。Embodiment An image recording apparatus according to an embodiment of the present invention will be explained based on FIGS. 1 and 2. FIG. 1 is a block diagram of an image recording apparatus according to an embodiment of the present invention, and FIG. 2 is a timing chart of LED drive current application in the image recording apparatus shown in FIG.
この画像記録装置は、複数の発光ダイオード（以下ＬＥ
Ｄという）より形成妊れ１ＬＥＤアレイ７と、そのＬＥ
Ｄの照射により潜像を形成する記録媒体である感光体ド
ラム１０と、ＬＥＤを発光させる印加電流を出力する駆
動回路６と、ＬＥＤアレイ７と光学的に配置し、ＬＥＤ
アレイ７の光の一部を受ける受光素子９と、受光素子９
のデータを入力し、このデータを基に演算を行うチョッ
パ制御回路を有した補正回路８とより構成されている。This image recording device uses a plurality of light emitting diodes (LE
(referred to as D), the LED array 7 and its LE
A photosensitive drum 10, which is a recording medium that forms a latent image by irradiation with D, a drive circuit 6 that outputs an applied current that causes the LED to emit light, and an LED array 7 are optically arranged, and the LED
A light receiving element 9 that receives part of the light from the array 7 and a light receiving element 9
The correction circuit 8 includes a chopper control circuit that inputs data and performs calculations based on this data.
補正回路８で演算されたデータは駆動回路６に入力し、
端子２０より入力される画信号と同期をとられ、ＬＥＩ
１１アレイ７の電流印加時間を制御する。補正回路８は
チロ ベーン
ヨノパ制御回路を有しており、ＬＥＤの発光量に応じて
変化するチョッパデユーティにより印加時間が第２図に
示すように調整１れる。即ち、発光量の大きいＬＥＤに
対しては第２図（ａ）に示すように、印加時間ｔｏを単
位印加時間ｔ３毎に区切られた複数のパルス状の印加時
間に断続させる一方、発光量の小さいＬＥＤに対しては
第２図（ｂ）に示すように、印加時間ｔｏを単位印加時
間ｔｎ （ｔ３＜ｔ４ ）毎に区切られた複数のパルス
状の印加時間に断続させている。単位印加時間ｔ５Ｉｌ
−を単位印加時間ｔ４より小すくシているが、１ドツト
当りの印加時間ｔｏを一定とし、その中において、実際
に駆動電流が印加される時間の総計を可変することによ
り、ＬＥＤの発光量の調整を行っている。The data calculated by the correction circuit 8 is input to the drive circuit 6,
Synchronized with the image signal input from terminal 20, the LEI
11 controls the current application time of the array 7. The correction circuit 8 has a chiro vane yonopa control circuit, and the application time is adjusted as shown in FIG. 2 by a chopper duty that changes depending on the amount of light emitted from the LED. That is, for an LED with a large amount of light emission, as shown in FIG. For small LEDs, as shown in FIG. 2(b), the application time to is intermittent into a plurality of pulse-like application times divided into unit application times tn (t3<t4). Unit application time t5Il
- is set smaller than the unit application time t4, but by keeping the application time to per dot constant and varying the total time during which the drive current is actually applied, the amount of light emitted by the LED can be adjusted. Adjustments are being made.
この時、感光体ドラム１ｏに与えられる光エネルギー分
布は第３図で示される。即ち、発光量の大きいＬＥＤに
よる光エネルギー分布Ｃと、発光量の小さいＬＥＤによ
る光エネルギー分布りは第３図に示す特性を有し、いず
れの場合も光エネルギー分布は均一となり、又、１ドツ
ト当りにおける６／、−１
印加時間は同一に保たれ、ドツトの大きさは等しく保た
れる。At this time, the distribution of light energy applied to the photosensitive drum 1o is shown in FIG. That is, the light energy distribution C due to the LED with a large amount of light emission and the light energy distribution due to the LED with a small amount of light emission have the characteristics shown in Fig. 3. In both cases, the light energy distribution is uniform, and one dot The 6/, -1 application time at each point is kept the same and the dot size is kept equal.
発明の効果
本発明によれば、チョッパ制御回路を有する補正回路を
有し、ＬＥＤの発光量に応じて印加電流の通電時間を調
整し、又、１ドツト当りの総計印加時間を同一に保って
いるため、ドツトの大ｕ−Ｊが同等に保たれ、適正な光
量補正が行われる。Effects of the Invention According to the present invention, a correction circuit having a chopper control circuit is provided, and the application time of the applied current is adjusted according to the amount of light emitted by the LED, and the total application time per dot is kept the same. Therefore, the large uJ of the dots is kept the same, and appropriate light amount correction is performed.
第１図は本発明の一実施例による画像記録装置のブロッ
ク図、第２図（ａ） 、（ｂ）は第１図に示す画像記録
装置の電流印加タイミング図、第３図は同じく画像記録
装置の光エネルギー分布図、第４図は従来の画像記録装
置のブロック図、第６図（ＩＬ） 、 （ｂ）は第４図
に示す画像記録装置の電流印加タイミング図、第６図は
同じく画像記録装置の光エネルギー分布図である。
６・・・・・・駆動回路、７・・・・・・ＬＥＤアレイ
、８・・・・・・テヨ・ツバ制御回路を有する補正回路
、１ｏ・・・・・・感光体ドラム（記録媒体）。
第２図
ｔり
第３図
第４図
第５図
＠６図
一弊七一
距離（劃月１割FIG. 1 is a block diagram of an image recording device according to an embodiment of the present invention, FIGS. 2(a) and (b) are current application timing diagrams of the image recording device shown in FIG. 1, and FIG. A light energy distribution diagram of the device, FIG. 4 is a block diagram of a conventional image recording device, FIG. 6 (IL), (b) is a current application timing diagram of the image recording device shown in FIG. 4, and FIG. FIG. 3 is a light energy distribution diagram of the image recording device. 6...Drive circuit, 7...LED array, 8...Correction circuit having a tilt/flange control circuit, 1o...Photoconductor drum (recording medium) ). Figure 2 Figure 3 Figure 4 Figure 5 @ Figure 6
Claims (1)
レイと、この発光ダイオードアレイを構成する発光ダイ
オードの照射により潜像を形成する記録媒体と、発光ダ
イオードを発光させる印加電流を発光ダイオードに出力
する駆動回路と、チョッパ制御回路を有し、駆動回路の
印加電流を制御する補正回路とよりなる画像記録装置。A light emitting diode array formed of a plurality of light emitting diodes, a recording medium that forms a latent image by irradiation with the light emitting diodes constituting the light emitting diode array, and a drive circuit that outputs an applied current to the light emitting diodes to cause the light emitting diodes to emit light. , an image recording apparatus comprising a chopper control circuit and a correction circuit for controlling an applied current of a drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2127485A JPS61180262A (en) | 1985-02-06 | 1985-02-06 | Image recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2127485A JPS61180262A (en) | 1985-02-06 | 1985-02-06 | Image recording device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61180262A true JPS61180262A (en) | 1986-08-12 |
Family
ID=12050538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2127485A Pending JPS61180262A (en) | 1985-02-06 | 1985-02-06 | Image recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61180262A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01103463A (en) * | 1987-10-16 | 1989-04-20 | Sharp Corp | Optical printer |
| JPH0219067A (en) * | 1988-07-06 | 1990-01-23 | Minolta Camera Co Ltd | Led array device |
-
1985
- 1985-02-06 JP JP2127485A patent/JPS61180262A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01103463A (en) * | 1987-10-16 | 1989-04-20 | Sharp Corp | Optical printer |
| JPH0219067A (en) * | 1988-07-06 | 1990-01-23 | Minolta Camera Co Ltd | Led array device |
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