JP2019006127A5

JP2019006127A5 -

Info

Publication number: JP2019006127A5
Application number: JP2018196412A
Authority: JP
Filing date: 2018-10-18
Publication date: 2019-03-14
Anticipated expiration: 2034-02-28

Description

上述した課題を解決し、目的を達成するために、本発明は、記録媒体にインク滴を吐出することにより画像を前記記録媒体に形成する画像形成装置であって、それぞれが前記記録媒体にインク滴を吐出する、副走査方向に並んだ複数のノズル孔を有するヘッドと、前記ヘッドの前記副走査方向に直交する主走査方向の移動を制御する主走査制御部と、前記副走査方向の同一位置上で、前記複数のノズル孔を前記主走査方向にＮ回（Ｎは２以上の整数）スキャンさせるように、前記主走査制御部を制御するスキャン制御部と、前記Ｎ回のスキャンのそれぞれ毎に、前記複数のノズル孔の前記副走査方向の位置に対応するラインの画像データから対応する画素を抽出し、抽出した前記画素の値を表す記録画素データを生成する信号生成部と、前記記録画素データに応じた波形パターンの記録信号を出力する信号出力部と、前記記録信号に応じて前記複数のノズル孔からインク滴を吐出させるヘッド駆動部と、を備え、前記信号生成部は、前記Ｎ回のスキャンのうちの第１スキャンにおいて、前記記録媒体における前記副走査方向の第１位置に対して前記複数のノズル孔のうちの第１ノズル孔からインク滴を吐出させ、前記Ｎ回のスキャンのうち前記第１スキャンより後の第２スキャンにおいて、前記記録媒体における前記第１位置より前記副走査方向の逆方向に戻る第２位置に対して前記複数のノズル孔のうちの前記第１ノズル孔とは異なる第２ノズル孔からインク滴を吐出させるパターンを含む前記記録画素データを生成する。 To solve the above problems and achieve the object, the present invention provides an image forming apparatus which forms on the recording medium an image by ejecting ink droplets onto a recording medium, ink is the recording medium, respectively A head having a plurality of nozzle holes arranged in the sub-scanning direction for discharging droplets, a main scanning control unit for controlling movement of the head in the main scanning direction orthogonal to the sub-scanning direction, and the same in the sub-scanning direction A scan control unit that controls the main scan control unit so that the plurality of nozzle holes are scanned N times (N is an integer of 2 or more) in the main scan direction on the position; and each of the N scans A signal generation unit that extracts corresponding pixels from image data of lines corresponding to positions in the sub-scanning direction of the plurality of nozzle holes, and generates recording pixel data representing the values of the extracted pixels; Comprises a signal output for outputting a recording signal waveform pattern corresponding to the recording element data, and a head drive unit to eject ink droplets from the plurality of nozzle holes in accordance with the recording signal, the signal generator, In the first scan of the N scans, ink droplets are ejected from the first nozzle holes of the plurality of nozzle holes to the first position in the sub-scanning direction on the recording medium, and the N times In the second scan after the first scan, the second of the plurality of nozzle holes with respect to a second position returning from the first position in the recording medium to the direction opposite to the sub-scanning direction. The recording pixel data including a pattern for ejecting ink droplets from a second nozzle hole different from the one nozzle hole is generated .

Claims

An image forming apparatus for forming on said recording medium an image by ejecting ink droplets onto a recording medium,
A head having a plurality of nozzle holes arranged in the sub-scanning direction, each ejecting ink droplets to the recording medium;
A main scanning control unit that controls movement of the head in the main scanning direction orthogonal to the sub-scanning direction ;
A scan control unit that controls the main scan control unit so that the plurality of nozzle holes are scanned N times (N is an integer of 2 or more) in the main scan direction at the same position in the sub-scanning direction;
For each of the N scans, the corresponding pixels are extracted from the image data of the line corresponding to the positions of the plurality of nozzle holes in the sub-scanning direction, and print pixel data representing the extracted pixel values is generated. A signal generator to
A signal output unit that outputs a recording signal having a waveform pattern corresponding to the recording pixel data;
A head drive unit that ejects ink droplets from the plurality of nozzle holes according to the recording signal ;
With
The signal generator is
In the first scan of the N scans, ink droplets are ejected from the first nozzle holes of the plurality of nozzle holes to the first position in the sub-scanning direction on the recording medium,
In the second scan after the first scan among the N scans, among the plurality of nozzle holes with respect to the second position returning from the first position in the recording medium to the direction opposite to the sub-scanning direction. An image forming apparatus that generates the recording pixel data including a pattern for ejecting ink droplets from a second nozzle hole different from the first nozzle hole .

The signal generation unit generates the recording pixel data having a pattern in which ink droplets corresponding to two adjacent pixels are not ejected in two consecutive scans.
The image forming apparatus according to claim 1.

A main scanning encoder that generates a position signal indicating the position of the head in the main scanning direction at predetermined intervals;
A timing generator for generating a timing signal in which the phase of the position signal is shifted;
Further comprising
The signal output unit outputs the recording signal at the timing of the timing signal,
The timing generation unit generates the timing signal having a different phase for each of the N scans.
The image forming apparatus according to claim 1.

The main scanning control unit moves the head in the main scanning direction at a predetermined speed;
The image forming apparatus according to claim 3 , wherein the timing generation unit generates the timing signal by delaying the position signal by a time shorter than a period in which the head detects the predetermined interval.

The timing generating section, for each N scans on the same position in the sub-scanning direction, claim 3 for generating the timing signal obtained by shifting the phase by 1 / N cycle relative to the period of the position signal Or the image forming apparatus according to 4 .

The head has N nozzle units that eject ink droplets of different colors,
Each of the N nozzle units includes L (L is an integer of 2 or more) nozzle holes arranged in a line at least at a predetermined distance in the sub-scanning direction,
The N nozzle units are arranged side by side in the main scanning direction,
The head drive unit, for each of the N scans of the same position in the sub-scanning direction, in any one of claims 1-5 for ejecting ink droplets from one nozzle hole of a different color The image forming apparatus described.

The image forming apparatus according to claim 6, further comprising: a sub-scanning control unit that controls movement of the recording medium in the sub-scanning direction in units of a distance shorter than an interval in the sub-scanning direction of the nozzle holes.

The signal generation unit generates the recording pixel data of a pattern for ejecting ink droplets from the L nozzle holes by simultaneously using nozzle holes included in the plurality of nozzle units in one scan. The image forming apparatus according to 6 or 7 .

An image forming method implemented by an image forming apparatus for forming an image on said recording medium by ejecting ink droplets onto a recording medium,
The image forming apparatus includes:
A head having a plurality of nozzle holes arranged in the sub-scanning direction, each ejecting ink droplets to the recording medium;
A main scanning control unit that controls movement of the head in the main scanning direction orthogonal to the sub-scanning direction ;
A scan control unit that controls the main scan control unit so that the plurality of nozzle holes are scanned N times (N is an integer of 2 or more) in the main scan direction at the same position in the sub-scanning direction;
For each of the N scans, the corresponding pixels are extracted from the image data of the line corresponding to the positions of the plurality of nozzle holes in the sub-scanning direction, and print pixel data representing the extracted pixel values is generated. A signal generator to
A signal output unit that outputs a recording signal having a waveform pattern corresponding to the recording pixel data;
A head drive unit that ejects ink droplets from the plurality of nozzle holes according to the recording signal;
With
The signal generator is
In the first scan of the N scans, ink droplets are ejected from the first nozzle holes of the plurality of nozzle holes to the first position in the sub-scanning direction on the recording medium,
In the second scan after the first scan among the N scans, among the plurality of nozzle holes with respect to the second position returning from the first position in the recording medium to the direction opposite to the sub-scanning direction. An image forming method for generating the recording pixel data including a pattern for ejecting ink droplets from a second nozzle hole different from the first nozzle hole .