JPS607263A - Printer - Google Patents
PrinterInfo
- Publication number
- JPS607263A JPS607263A JP58114401A JP11440183A JPS607263A JP S607263 A JPS607263 A JP S607263A JP 58114401 A JP58114401 A JP 58114401A JP 11440183 A JP11440183 A JP 11440183A JP S607263 A JPS607263 A JP S607263A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- pulse width
- density information
- recording
- laser diode
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
- H04N1/4056—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern varying in one dimension only, e.g. dash length, pulse width modulation [PWM]
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Fax Reproducing Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、1記録ドツトでドツトサイズ欠かえ1中間
111ケ表現しようとする電子写真式プリンタにおいて
、記録ドツト径のコントp−ルZパルス幅変調により行
うプリンク装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plinking device that uses controlled pulse width modulation to control the diameter of a recording dot in an electrophotographic printer that attempts to express 111 dot sizes in one recording dot. It is.
従来、この種装色においては、第1図に示すようにレー
ザタイオート1により記録情報の濃度信号に応じてパル
ス幅変調を行い、レーザビームのオンオフ制御を行って
レンズ系21回転ミラー3゜レンズ4を介して感光体5
0表面上に第2図(a)に示すようなパルス幅に応じた
第2図(b)に示すよう1工潜像強度分布が得られ、こ
の静電潜像を忠実にトナーにより現像するとスレッシュ
ホールド値S以上にトナーが付着し、第2図CC)に示
す記録ドットヶ書くことができる。このよ5にしてレー
ザダイオード1の制御をパルス幅f調することにより、
記録ドツト径をコントロールできる。Conventionally, in this type of coloring, as shown in FIG. 1, a laser tie auto 1 performs pulse width modulation according to the density signal of the recorded information, controls the on/off of the laser beam, and rotates the lens system 21 rotating mirror 3°. Photoreceptor 5 via lens 4
A latent image intensity distribution as shown in FIG. 2(b) corresponding to the pulse width shown in FIG. 2(a) is obtained on the zero surface, and when this electrostatic latent image is faithfully developed with toner. The toner adheres to an amount exceeding the threshold value S, and the number of recorded dots shown in FIG. 2 (CC) can be written. By controlling the laser diode 1 in this way by adjusting the pulse width f,
Recording dot diameter can be controlled.
すなわち、第2図(a)のようにパルスの立下りが6a
のときは第2図(b)のようにa像強度は立下りが6b
のようKな9、しきい値SIC対応して第2図(c)の
ようにドツト6Cが記録される。同様にしてパルスの立
下りが7aのときは潜像強度の立下りも7bのようにな
りトン)7cが記録される。That is, as shown in FIG. 2(a), the falling edge of the pulse is 6a.
In this case, as shown in Figure 2(b), the falling edge of the a image intensity is 6b.
As shown in FIG. 2(c), a dot 6C is recorded corresponding to the threshold value SIC. Similarly, when the pulse falls at 7a, the latent image intensity also falls at 7b, and 7c is recorded.
しかし、パルス幅のコントロールは、パルスの立上り、
すなわちオン・オフのタイミング乞一定とし、記録ドツ
トの濃度情報に応じて、パルス幅だけゲ変化させている
ため、記録ドツトは、第3図(a)のドツト列い)に示
すようにパルス列(助に応じて記録ドツトと記録ドツト
の間隔は濃度が変化°するごとに変わり、たとえばマト
リクス表現にニ一つ℃多1’i!i調′lt社現しよう
とげる場合は、第3図(b)に示・3−ようvcマトリ
クス内で記録ドツトが分散せず記録パターンによっては
、濃度υらが発生1′るといった欠点ン有していた。However, pulse width control is based on the rise of the pulse,
In other words, the on/off timing is kept constant, and the pulse width is varied according to the density information of the recording dots, so that the recording dots follow the pulse train (dot row) as shown in FIG. The interval between the recording dots changes depending on the density. For example, if the matrix expression is to be expressed with two tones, the distance between the recording dots changes as shown in Figure 3 (b ), the recording dots are not dispersed within the VC matrix, and depending on the recording pattern, the density υ etc. may occur.
この発明は、この欠点を除去するため、レーザビー人の
パルス幅変調を行うさいにパルス幅にLi>じ又パルス
の立上り時間乞制御し、記録ドツトと記+’t、 t・
ノドの中心間隔ン常に一足にできるようにしたもつであ
る。以下この発明について詳細に説明fる。In order to eliminate this drawback, the present invention controls the pulse width as well as the rise time of the pulse when performing laser beam pulse width modulation, and records the recording dots.
It is made so that the distance between the center of the throat is always one foot. This invention will be explained in detail below.
第4凶はこり発明の一実施例である、プリンタコントロ
ーラIQY示したもので、11は記録すべき記録ドツト
の儂度情報乞格納するバッファ゛メ士す、12は前記バ
ッファメモリ11に格納された濃度情報に応じて記録ド
ツト径をコントロール発生器12の信号に従ってレーザ
ダイオード1の制御を行うレーザクイオードドライバ、
14は制御部である。なお、1,2は第1図に示すレー
ザダイオード、レンズ系ン示す。The fourth problem is a printer controller IQY, which is an embodiment of the present invention, in which 11 is a buffer for storing information about the recording dots to be recorded, and 12 is a buffer memory 11 that stores information about the recording dots to be recorded. a laser diode driver that controls the laser diode 1 according to a signal from a generator 12 to control the recording dot diameter according to the density information obtained;
14 is a control section. Note that 1 and 2 represent the laser diode and lens system shown in FIG.
次に動作について説明すると、多値の濃度情報をもつデ
ータが入力されるとバッフ7メモリ11に一時格納し、
1画素ごとに順次濃度情報を取り出しなから、濃度情報
に対応したパルスの発生パターンをパターン発生器12
から読み出し、レーザダイオード10制御信号としてレ
ーザダイオードドライバ13に入力する。Next, to explain the operation, when data with multi-level concentration information is input, it is temporarily stored in the buffer 7 memory 11,
Since the density information is sequentially extracted for each pixel, the pattern generator 12 generates a pulse generation pattern corresponding to the density information.
, and input it to the laser diode driver 13 as a laser diode 10 control signal.
今、−例としてパルス幅7R調によって表現しうる1記
録トン)・あたりの濃度階調が4値である場合を取り上
げる。パターン発生器12の内容は第5図に示すような
パルスの遅延時間とパルス幅であり、記録ドツトの中心
から左右に均等に記録ドツトが太き(なつ℃い(よ5に
設定されているものである。’j’なわち、パターン発
生器12は濃度情報10′〜′3′に対応してパルス遅
延幅を1/3パルス、1/6パルス、0パルス、のよ5
に選択してからパルス幅がl/3パルス、2/3パルス
、1/1パルスを出力する枯成と72っている。このよ
5〕よ’l’l#成はの度情報判別手段、パルス遅延幅
決定手段、パルス幅決定手段、およυ・出力手段で容易
に1貨成できる。そし℃、マイク1コンピュータを用い
て実現することもできる。Now, as an example, we will take up a case where the density gradation per recording ton, which can be expressed by a pulse width of 7R levels, is four levels. The contents of the pattern generator 12 are the pulse delay time and pulse width as shown in FIG. 'j' That is, the pattern generator 12 changes the pulse delay width to 5 pulses such as 1/3 pulse, 1/6 pulse, and 0 pulse, corresponding to the density information 10' to '3'.
After selecting , the pulse width is set to 72 to output 1/3 pulse, 2/3 pulse, and 1/1 pulse. 5] This information can be easily generated using the information discriminating means, the pulse delay width determining means, the pulse width determining means, and the output means. It can also be realized using a computer.
第6図(a)に示づ゛人力情報に従ってこの発明により
記録すると、第6図(b)のよ)にパルス幅により第6
図(e)の記録結果がイυられる。これは、1・]様の
条件により従来の方法で行った場合の第3条
図(b)のセ1]に比べると6己録ドツトが分散し、記
録a度乞より一層平均化することがでとる。When recorded according to the present invention according to the manual information shown in FIG. 6(a), the 6th pulse width is recorded as shown in FIG.
The recording result shown in Figure (e) is shown. This means that compared to section 1 of Article 3 (b) when the conventional method is used under the conditions of 1.], the 6 self-recorded dots are dispersed, and the dots are evened out even more than when recording. I take it.
また、hC録ドツトの中心間の距離は常に一足に保たれ
、記録ドツトの片をりによる記録むらゼ防止−ず−る幼
果がある。In addition, the distance between the centers of the hC recording dots is always maintained at one foot, and there is a young fruit that prevents uneven recording due to fragmentation of the recording dots.
以上詳細に説明したよ5に、この発明によれば、記録ド
ツトの中心ン一定間隔に設定できるため。As described in detail above, according to the present invention, the centers of the recording dots can be set at constant intervals.
モノクロの階調記録Q)ほかにカラー階調記録におい℃
も応用できる。1−なわち、カラー階IA iB録にお
いては、イエp−、シアン、マゼンタおよび黒の4色の
インクの混色に、19色表現を行うが、インクの重ねの
度合いにより、たとえは第7図(a)に示すよ5に従来
のパルス幅変調による重ねと、第7図(b)に示すよ5
にこの発明の重ねでは、両者とも同じ大きさのイエl:
1−YK、同じ大きさのマゼンタMft重ねているのに
、色あいが異なって見えるだけでな(、第7図(a)で
は、記録ドツト径が変わると記録ドツト間のピッチが異
なるため色ずれの発生の原因となる。Monochrome gradation recording Q) In addition to color gradation recording
can also be applied. 1- That is, in the color scale IA iB record, 19 colors are expressed by mixing four inks of yellow, cyan, magenta, and black, but depending on the degree of overlapping of the inks, for example, 5 as shown in (a), and 5 as shown in FIG. 7(b).
In this invention, both have the same size:
1-YK, magenta Mft of the same size are overlapped, but the color tone looks different (in Fig. 7 (a), when the diameter of the recording dots changes, the pitch between the recording dots changes, resulting in color shift. It causes the occurrence of.
しかし、947図(b)ではピンチ一定のため、色ドツ
トの重ねによる色ずれの心配がな(、さらに中心が一定
のため、マトリクス表現で色を表現した場合にも従来に
比べて平均化されたむらのない画像を記録できる利点が
ある。However, in Figure 947 (b), the pinch is constant, so there is no need to worry about color shift due to overlapping color dots (furthermore, since the center is constant, even when colors are expressed in a matrix, they are averaged better than before). It has the advantage of being able to record images without unevenness.
第1図はレーザダイオードを用いた従来の電子写真代ブ
リ/りの概略図、第2図(1,)〜<C)は従来のパル
ス幅変調による記録ドツト径のコントロールの概念な説
明するための図、第3図(a)t (b)は従来のパル
ス幅変−4によるドツト列とノくルス列の関係ならびに
マトリクス記録の中間調衣現乞示した図、第4図はこの
発明の一実施例の要部であるブリンクコントローラの構
成を示すブロック図、第5図はパターン発生器の内存と
記録例を示す図、第6図(a)〜(c)はこの発明によ
る入力情報のパターン、パルス波形、および記録結果ン
それぞハ。
示す図、第7図(a) 、(b)はインクの重なり状態
を示す従来例とこの発明による例とt示す図である。
図中、1はレーザタイオード、2はレンズ系、3は回転
ミラー、4はレンス、5は感光体、10はプリンタコン
トルーラ、11はバッファメモリ。
12はバター/発生器、13は、レーザダイオードドラ
イバ、14は制御部である。
第1図
第2図
第3図
(a)
11 1
1 (11
(A)−
(b)
第6図
(a) (b)
第7図
(a)
(c)
(b)Figure 1 is a schematic diagram of a conventional electrophotographic recording method using a laser diode, and Figures 2 (1,) to <C) are for explaining the concept of controlling the recording dot diameter by conventional pulse width modulation. Figures 3(a) and 3(b) are diagrams showing the relationship between the dot array and the noxle array based on the conventional pulse width variation of -4, as well as the intermediate adjustment of matrix recording. A block diagram showing the configuration of the blink controller which is the main part of one embodiment, FIG. 5 is a diagram showing the internal structure of the pattern generator and a recording example, and FIGS. 6(a) to (c) are the input information according to the present invention. pattern, pulse waveform, and recording results, respectively. 7(a) and 7(b) are diagrams illustrating a conventional example and an example according to the present invention showing the overlapping state of ink. In the figure, 1 is a laser diode, 2 is a lens system, 3 is a rotating mirror, 4 is a lens, 5 is a photoreceptor, 10 is a printer controller, and 11 is a buffer memory. 12 is a butter/generator, 13 is a laser diode driver, and 14 is a control section. Figure 1 Figure 2 Figure 3 (a) 11 1 1 (11 (A) - (b) Figure 6 (a) (b) Figure 7 (a) (c) (b)
Claims (1)
ドのパルス幅変調7用いてコン)p−ルし、l記録ドツ
トごとに濃度階調を行い光V)込みを行511を子写真
式プリンタにおいて、1記録ドツトの濃度情報に応じて
レーザダイオードのパルスの立上り時間とパルス幅を制
御し記録ドツトの間隔をドツトサイズによらず常に一定
とするバクーン発生器を具備せしめたこと′ft特徴と
するプリンク装置。The laser beam is scanned, the recording dot diameter is controlled using the pulse width modulation 7 of the laser diode, and the density gradation is performed for each recording dot. , a printer characterized in that it is equipped with a vacuum generator that controls the rise time and pulse width of the laser diode pulse according to the density information of one recording dot, and keeps the interval between recording dots constant regardless of the dot size. Device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58114401A JPS607263A (en) | 1983-06-27 | 1983-06-27 | Printer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58114401A JPS607263A (en) | 1983-06-27 | 1983-06-27 | Printer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS607263A true JPS607263A (en) | 1985-01-16 |
Family
ID=14636754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58114401A Pending JPS607263A (en) | 1983-06-27 | 1983-06-27 | Printer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS607263A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6249783A (en) * | 1985-08-29 | 1987-03-04 | Canon Inc | Picture processor |
JPS62116959A (en) * | 1985-11-18 | 1987-05-28 | Canon Inc | Color copying machine |
JPS6367076A (en) * | 1986-09-08 | 1988-03-25 | Ricoh Co Ltd | Picture processor |
JPS63123067A (en) * | 1986-11-13 | 1988-05-26 | Canon Inc | Image recording device |
JPS6472850A (en) * | 1987-09-14 | 1989-03-17 | Canon Kk | Image data processing apparatus |
JPH03246071A (en) * | 1990-02-26 | 1991-11-01 | Hitachi Ltd | Semiconductor laser recording device |
US5876773A (en) * | 1995-05-12 | 1999-03-02 | Hagiwara; Yoshihide | Process of making a plant extract |
US8130409B2 (en) | 2003-06-11 | 2012-03-06 | Canon Kabushiki Kaisha | Image forming apparatus |
-
1983
- 1983-06-27 JP JP58114401A patent/JPS607263A/en active Pending
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6249783A (en) * | 1985-08-29 | 1987-03-04 | Canon Inc | Picture processor |
JPS62116959A (en) * | 1985-11-18 | 1987-05-28 | Canon Inc | Color copying machine |
JPS6367076A (en) * | 1986-09-08 | 1988-03-25 | Ricoh Co Ltd | Picture processor |
JPS63123067A (en) * | 1986-11-13 | 1988-05-26 | Canon Inc | Image recording device |
JPS6472850A (en) * | 1987-09-14 | 1989-03-17 | Canon Kk | Image data processing apparatus |
JPH03246071A (en) * | 1990-02-26 | 1991-11-01 | Hitachi Ltd | Semiconductor laser recording device |
US5876773A (en) * | 1995-05-12 | 1999-03-02 | Hagiwara; Yoshihide | Process of making a plant extract |
US6022573A (en) * | 1995-05-12 | 2000-02-08 | Hagiwara; Yoshihide | Plant extract |
US8130409B2 (en) | 2003-06-11 | 2012-03-06 | Canon Kabushiki Kaisha | Image forming apparatus |
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