JP2004181724A - Ink jet recorder - Google Patents

Ink jet recorder Download PDF

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Publication number
JP2004181724A
JP2004181724A JP2002350023A JP2002350023A JP2004181724A JP 2004181724 A JP2004181724 A JP 2004181724A JP 2002350023 A JP2002350023 A JP 2002350023A JP 2002350023 A JP2002350023 A JP 2002350023A JP 2004181724 A JP2004181724 A JP 2004181724A
Authority
JP
Japan
Prior art keywords
recording
recording medium
ink jet
image sensor
line image
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.)
Withdrawn
Application number
JP2002350023A
Other languages
Japanese (ja)
Inventor
Masaaki Naoi
雅明 直井
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP2002350023A priority Critical patent/JP2004181724A/en
Publication of JP2004181724A publication Critical patent/JP2004181724A/en
Withdrawn legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a recorder employing a long head performing high speed recording in which a check pattern is read out with high accuracy and high accuracy correction is performed automatically. <P>SOLUTION: The ink jet recorder comprises a line image sensor 10 provided at a reversal mechanism section for back sheet discharge and reads out a check pattern with high accuracy while self-traveling the sensor 10 when a recording medium is stopped for reversal or while carrying the recording medium at a low speed after reversal. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、長尺インクジェット記録ヘッド(以下、長尺ヘッドと記す。)を用いたインクジェット記録装置に関する。
【0002】
【従来の技術】
インクジェット記録装置に用いるインクジェット記録ヘッドには、インクを吐出するためのノズルが複数あり、各々のノズル毎に吐出特性が異なるため、記録後の画像にも違いが生ずる。また、使用中にノズルが詰まって不吐となり、記録画像にすじ状の画像の欠落も生ずる。さらに、長尺ヘッドの場合には各色毎に長尺ヘッドが独立しているため、長尺ヘッド取り付け誤差などによる色ずれが顕著である。
【0003】
以上のようなことから、設置時や一定期間使用した後に、それらを確認するためのチェックパターンを記録し、ユーザーまたは本体排紙部などに設置したセンサ等により、色のばらつきや色ずれ、不吐などの不具合状況を確認し、その結果に従って記録結果が良くなるように補正をして記録を行う必要がある。
【0004】
【発明が解決しようとする課題】
長尺ヘッドを用いたインクジェット記録装置は,従来のインクジェット記録装置のように、インクジェット記録ヘッドの走査を繰り返しながら記録を行うのでなく、長尺ヘッドを固定し、記録媒体を搬送しながら記録していく構成になっている。その結果、従来より高速に記録できることが特徴である。
【0005】
しかし、高速で記録が可能な記録装置の場合、従来の記録装置より単位時間辺りの記録回数が多く、経年変化による画質の劣化が顕著である。よって、記録品質の確認を頻繁に行う必要がある。ユーザー自身が読み取って確認するには、長尺ヘッドのノズル数が従来のインクジェット記録ヘッドより1桁以上多い(8インチ、600dpi、4本構成の場合、約2万ノズル)ため不可能である。よって、センサ等にて自動で行う必要がある。しかし、高速で記録媒体が搬送されるためセンサの読み取りが間に合わず、確認するのに必要な精度で記録品質を確認できない問題があった。
【0006】
例えば、A4サイズ(210mm×297mm)の記録媒体を横向きに約100mmの間隔を置いて毎分30枚の搬送速度で記録を行なっている時に、42μm(600dpiの1画素)の精度で読み取るのに必要な時間は、
1秒当たりの搬送量:[(210mm/枚+100mm)×30枚/分]/60秒=155mm
より
42μmの読み取り時間:42μm/155mm=271μ秒
となる。一般的なライン・イメージ・センサの1ラインの読み取り時間は数m秒以上は必要なため、42μmの精度では読み取ることは不可能である。
【0007】
搬送速度を遅くして記録することによって、記録品質を確認するのに必要な精度で読み取ることは可能であるが、この場合、複数本で構成される長尺ヘッド相互間の記録時間の間隔が長くなってしまう。インクジェット記録装置の場合、インクが記録媒体の内部に浸透し、その後水分が蒸発してインクが定着する。複数の色を重ねて色を生成する場合には他の色のインクが重なる時間の間隔によって最終的に生成される色が異なる特徴がある。よって、遅い速度で搬送しながら記録した時と通常の搬送速度で記録した時とでは生成された色が異なるため、記録した品質を正しく確認するためには通常と同じ搬送速度で記録を行う必要が有る。
【0008】
よって、通常の搬送速度で記録した後、記録品質を確認するのに必要な精度で読み取れる速度以下に搬送速度を遅くした後、読み取る動作を自動的に行なう機構が必要で有った。
【0009】
本発明は、上述の問題点に着目してなされたものであって、高速で記録を行う長尺ヘッドを用いた記録装置において、チェックパターンを高精度で読み取りを行い、高精度な補正を自動で行うことのできるインクジェット記録装置の提供を目的としている。
【0010】
【課題を解決するための手段】
前述の課題を解決するために本発明のインクジェット記録装置は、フィニッシャーやソーターなどの排紙部に従来から用いられている、記録媒体が記録した順に並ぶように搬送方向を反転させて背面排紙するための搬送方向反転機構を流用し、そこで記録品質確認用の記録媒体を停止した時、または反転後に低速で搬送しながら、ライン・イメージ・センサにて記録媒体を読み取り、記録品質を確認するのに必要とされる精度で記録品質を読み取ることを特徴とする。
【0011】
上記構成を、改めて以下(1)〜(3)に整理して示す。
【0012】
(1)複数の長尺インクジェット記録ヘッドと記録媒体の排紙部に搬送方向反転機構を有するインクジェット記録装置において、搬送方向反転機構部にライン・イメージ・センサを設け、記録媒体の記録面を読み取るインクジェット記録装置。
【0013】
(2)上記(1)において、搬送方向反転機構内に自走式のライン・イメージ・センサを設け、搬送方向の反転のために記録媒体が停止中にライン・イメージ・センサを自走させて読み取るインクジェット記録装置。
【0014】
(3)上記(1)において、搬送方向の反転後、記録媒体を搬送しながらライン・イメージ・センサで読み取るインクジェット記録装置。
【0015】
【発明の実施の形態】
以下に、本発明の実施の形態を実施例に基づいて図面を参照しながら説明する。
【0016】
【実施例1】
図1に記録媒体の搬送方向反転部に自走式のライン・イメージ・センサを設置し、反転のために停止した時に記録媒体を停止したまま、ライン・イメージ・センサを自走させながら読み取る装置構成を示す。
【0017】
図1において、1は必要な色数に応じて(本図は4色の例)複数本で構成する長尺ヘッド、2は記録媒体を搬送ベルト等で構成ざれる搬送部、3は記録した記録媒体を保持する排紙トレイで本図は複数の排紙トレイで構成した例である。4は記録した記録媒体の搬送路を切り替える搬送路切替部、5は記録媒体を複数の排紙トレイ3に振り分けるソーター部、6は給紙部、7は記録するための記録媒体を保持する給紙ユニット、8は記録媒体、9は記録した記録媒体8の搬送方向を反転する搬送方向反転部、10は光源と受光部とで構成されるライン・イメージ・センサ、11は記録媒体の記録面が読み取れるための透過原稿台である。
【0018】
通常の記録時は給紙ユニット7にある記録媒体8を給紙部6により搬送部2に送り、搬送しながら長尺ヘッド1にて記録を行い、搬送路切替部4にて搬送方向反転部9に記録した記録媒体8を送り、搬送方向反転部9にて停止後直ちに搬送方向を反転してソーター部5に送り、指定した排紙トレイ3に排紙する。搬送方向を反転することにより記録した面を下向きして排紙されるため、第3者に対して記録内容を保護したり、複数記録した時に順番に並ぶことができる。上記の記録手順では記録媒体8を反転したが、必要に応じて搬送路切替部4から直接ソーター部5に送り、記録した面を上向きのまま排紙トレイ3に排紙することも可能である。
【0019】
次に、本来の目的である記録品質を確認するためチェックパターンを記録し、読み取るときは,給紙ユニット7にある記録媒体8を給紙部6により搬送部2に送り,通常の速さで搬送しながらチェックパターンを長尺ヘッド1にて記録を行い、搬送路切替部4にて搬送方向反転部9に送り搬送方向反転部9にて反転のため停止するまでは通常の記録時と同じである。通常の記録時は、直ちに反転してソーター部5に送られるが,チェックパターンを読み取る必要があるため、記録媒体8は停止したまま、透過原稿台11に本図に示さない手段により密着させ、ライン・イメージ・センサ10が自走しながらチェックパターンを読み取る。読み取りが終了したら搬送方向反転部9から通常の記録時と同じようにソーター部5に送り、指定した排紙トレイ3に排紙する。読み取った情報は、本体のCPU等により処理を行い、以降の記録時に反映させて劣化した記録品質を改善する。
【0020】
【実施例2】
実施例1は搬送方向反転部9に記録媒体8を停止させ、ライン・イメージ・センサ10を自走させて読み取る構成を、本実施例では記録媒体8の反転後に記録媒体8を低速で搬送させながら固定されたライン・イメージ・センサ10にて読み取るような構成の例を図2に示す。
【0021】
ライン・イメージ・センサ10は搬送方向反転部9の反転後に記録媒体8が搬送される搬送路に固定して設置されている。
【0022】
記録品質を確認するためチェックパターンを読み取るときは,記録後の記録媒体8が搬送方向反転部9に送られて来るまでは実施例1と同じである。通常の記録時と同じように搬送方向反転部9にて直ちに反転し、ソーター部5に送られる。このときの記録媒体8を送る搬送速度は,必要とされる精度でライン・イメージ・センサ10が読み取れるように低速で搬送しながらチェックパターンを読み取る。読み取りながらソーター部5に送られた記録媒体8は、実施例1と同様に指定された排紙トレイ3に排紙されると共に,読み取った情報は本体のCPU等により処理を行い、以降の記録時に反映させて劣化した記録品質を改善する。
【0023】
【発明の効果】
高速で記録しながら低速で読み取れることが可能なため、従来に比べて、より高い精度で記録品質を確認できるため、より高精度な記録品質の改善が行える。
【0024】
ユーザー自身が確認および確認結果の入力等の作業が不要なため、完全自動化が可能である。
【0025】
完全自動化により、頻繁に補正が行えるため、常に高品質な記録が行える。
【0026】
本発明を実現するための機構の内、高価な搬送路反転機構は従来の背面排紙用の反転機構を流用できるため、近年のPC用フラットベット・スキャナの普及により安価になったライン・イメージ・センサの追加のみで構成できるため、安価に実現できる。
【図面の簡単な説明】
【図1】実施例1の装置構成図
【図2】実施例2の装置構成図
【符号の説明】
1 長尺インクジェット記録ヘッド(長尺ヘッド)
2 搬送部
3 排紙トレイ
4 搬送路切替部
5 ソーター部
6 給紙部
7 給紙ユニット
8 記録媒体
9 搬送方向反転部
10 ライン・イメージ・センサ
11 透過原稿台
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ink jet recording apparatus using a long ink jet recording head (hereinafter, referred to as a long head).
[0002]
[Prior art]
An ink jet recording head used in an ink jet recording apparatus has a plurality of nozzles for discharging ink, and each of the nozzles has a different discharge characteristic. In addition, nozzles are clogged during use, causing ejection failure, and a striped image is lost in the recorded image. Further, in the case of a long head, since the long head is independent for each color, color misregistration due to a long head mounting error or the like is remarkable.
[0003]
As described above, at the time of installation or after a certain period of use, a check pattern for confirming them is recorded. It is necessary to check the status of troubles such as ejection and make a correction according to the result so as to improve the printing result before printing.
[0004]
[Problems to be solved by the invention]
An ink jet recording apparatus using a long head does not perform recording while repeating scanning of the ink jet recording head as in a conventional ink jet recording apparatus, but performs recording while fixing a long head and transporting a recording medium. It has a configuration. As a result, it is characterized in that recording can be performed at a higher speed than before.
[0005]
However, in the case of a recording apparatus capable of high-speed recording, the number of recordings per unit time is larger than that of a conventional recording apparatus, and the deterioration of image quality due to aging is remarkable. Therefore, it is necessary to frequently check the recording quality. It is not possible for the user to read and confirm the data because the number of nozzles of the long head is one digit or more larger than that of the conventional inkjet recording head (8 inches, 600 dpi, about 20,000 nozzles in the case of a four-head configuration). Therefore, it is necessary to perform this automatically by a sensor or the like. However, since the recording medium is conveyed at a high speed, the reading of the sensor cannot be performed in time, and there is a problem that the recording quality cannot be confirmed with the accuracy required for confirmation.
[0006]
For example, when printing is performed on an A4 size (210 mm × 297 mm) recording medium at a transport speed of 30 sheets per minute at an interval of about 100 mm in a horizontal direction, it is possible to read with an accuracy of 42 μm (1 pixel of 600 dpi). The time required is
Conveyance amount per second: [(210 mm / sheet + 100 mm) × 30 sheets / min] / 60 seconds = 155 mm
The read time of 42 μm is: 42 μm / 155 mm = 271 μsec. Since the reading time of one line of a general line image sensor needs to be several milliseconds or more, it is impossible to read with a precision of 42 μm.
[0007]
By recording at a slower transport speed, it is possible to read with the accuracy required to check the recording quality. It will be long. In the case of an ink jet recording apparatus, the ink penetrates into the inside of the recording medium, and then the water evaporates and the ink is fixed. When a color is generated by superimposing a plurality of colors, there is a characteristic that a color finally generated differs depending on an interval of time when inks of other colors overlap. Therefore, the generated color is different between when recording while transporting at a slow speed and when recording at a normal transport speed, so it is necessary to perform recording at the same transport speed as normal in order to correctly confirm the recorded quality There is.
[0008]
Therefore, after recording at a normal transport speed, a mechanism for automatically performing the reading operation after reducing the transport speed to a speed lower than the speed at which the reading can be performed with the accuracy required for confirming the recording quality is required.
[0009]
The present invention has been made in view of the above-described problems, and in a recording apparatus using a long head that performs high-speed recording, a check pattern is read with high accuracy, and highly accurate correction is automatically performed. It is an object of the present invention to provide an ink jet recording apparatus that can be performed by using the above method.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problem, the ink jet recording apparatus of the present invention has been conventionally used in a paper discharge unit such as a finisher or a sorter. When the recording medium for confirming the recording quality is stopped, or while the recording medium is conveyed at a low speed after the reversal, the recording medium is read by the line image sensor to confirm the recording quality. It is characterized in that the recording quality is read with the precision required for the recording.
[0011]
The above configuration will be summarized and shown below in (1) to (3).
[0012]
(1) In an ink jet recording apparatus having a plurality of long ink jet recording heads and a conveyance direction reversing mechanism in a paper ejection section of a recording medium, a line image sensor is provided in the conveyance direction reversing mechanism to read a recording surface of the recording medium. Ink jet recording device.
[0013]
(2) In the above (1), a self-propelled line image sensor is provided in the conveyance direction reversing mechanism, and the line image sensor is self-propelled while the recording medium is stopped for reversing the conveyance direction. An inkjet recording device to read.
[0014]
(3) The ink jet recording apparatus according to (1), wherein the recording medium is read by a line image sensor while being conveyed after the conveyance direction is reversed.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples with reference to the drawings.
[0016]
Embodiment 1
FIG. 1 shows an apparatus in which a self-propelled line image sensor is installed at a recording medium conveyance direction reversing part, and the recording medium is stopped and the line image sensor is self-propelled when stopped for reversal. The configuration is shown.
[0017]
In FIG. 1, reference numeral 1 denotes a long head composed of a plurality of recording heads according to the required number of colors (this example is an example of four colors). FIG. 2 shows an example of a paper discharge tray holding a recording medium, which is constituted by a plurality of paper discharge trays. Reference numeral 4 denotes a transport path switching unit for switching the transport path of the recorded recording medium, 5 a sorter unit for distributing the recording medium to a plurality of discharge trays 3, 6 a paper feed unit, and 7 a feeder for holding a recording medium for recording. Paper unit, 8 is a recording medium, 9 is a conveyance direction reversing unit for reversing the conveyance direction of the recorded recording medium 8, 10 is a line image sensor composed of a light source and a light receiving unit, and 11 is a recording surface of the recording medium Is a transparent platen for reading.
[0018]
At the time of normal recording, the recording medium 8 in the paper supply unit 7 is sent to the conveyance unit 2 by the paper supply unit 6, recording is performed by the long head 1 while being conveyed, and the conveyance direction switching unit 4 is used by the conveyance path switching unit 4. The recording medium 8 recorded on the recording medium 9 is fed, the conveyance direction is reversed immediately after stopping at the conveyance direction reversing unit 9, sent to the sorter unit 5, and discharged to the specified discharge tray 3. By reversing the transport direction, the recording surface is discharged with the recorded surface facing downward, so that the recorded contents can be protected against a third party, and can be arranged in order when a plurality of recordings are made. In the above-described recording procedure, the recording medium 8 is reversed. However, if necessary, the recording medium 8 can be directly sent from the transport path switching unit 4 to the sorter unit 5 and discharged to the discharge tray 3 with the recorded surface facing upward. .
[0019]
Next, when a check pattern is recorded and read in order to confirm the original recording quality, the recording medium 8 in the paper supply unit 7 is sent to the transport unit 2 by the paper supply unit 6 at a normal speed. The check pattern is recorded by the long head 1 while being conveyed, sent to the conveyance direction reversing unit 9 by the conveyance path switching unit 4, and stopped by the conveyance direction reversing unit 9 for reversal. It is. At the time of normal recording, it is immediately reversed and sent to the sorter unit 5, but it is necessary to read the check pattern. Therefore, the recording medium 8 is stopped and brought into close contact with the transparent platen 11 by means not shown in FIG. The line image sensor 10 reads the check pattern while running by itself. When the reading is completed, the sheet is sent from the transport direction reversing section 9 to the sorter section 5 in the same manner as in normal recording, and is discharged to the specified discharge tray 3. The read information is processed by a CPU or the like of the main body, and is reflected at the time of subsequent recording to improve the deteriorated recording quality.
[0020]
Embodiment 2
Embodiment 1 has a configuration in which the recording medium 8 is stopped by the conveyance direction reversing unit 9 and the line image sensor 10 is driven to run for reading. In the present embodiment, the recording medium 8 is conveyed at a low speed after the recording medium 8 is reversed. FIG. 2 shows an example of a configuration in which reading is performed by the fixed line image sensor 10.
[0021]
The line image sensor 10 is fixedly installed on a transport path on which the recording medium 8 is transported after the transport direction reversing unit 9 reverses.
[0022]
When the check pattern is read to check the recording quality, the operation is the same as that in the first embodiment until the recording medium 8 after recording is sent to the transport direction reversing unit 9. As in the case of normal recording, the sheet is immediately reversed by the transport direction reversing section 9 and sent to the sorter section 5. At this time, the check pattern is read while the recording medium 8 is conveyed at a low speed so that the line image sensor 10 can be read with required accuracy. The recording medium 8 sent to the sorter unit 5 while being read is discharged to the specified discharge tray 3 in the same manner as in the first embodiment, and the read information is processed by the CPU or the like of the main body, and the subsequent recording is performed. Improve the deteriorated recording quality by reflecting it sometimes.
[0023]
【The invention's effect】
Since it is possible to read at a low speed while recording at a high speed, it is possible to confirm the recording quality with higher accuracy than in the past, so that it is possible to improve the recording quality with higher accuracy.
[0024]
Since there is no need for the user to perform operations such as confirmation and input of the confirmation result, complete automation is possible.
[0025]
Since the correction can be frequently performed by the full automation, high-quality recording can always be performed.
[0026]
Among the mechanisms for realizing the present invention, the expensive conveying path reversing mechanism can use the conventional reversing mechanism for back-side paper discharge, so the line image has become inexpensive due to the recent spread of flatbed scanners for PCs.・ Since it can be configured only by adding a sensor, it can be realized at low cost.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an apparatus configuration according to a first embodiment. FIG. 2 is a diagram illustrating an apparatus configuration according to a second embodiment.
1 Long inkjet recording head (long head)
2 Conveyance unit 3 Discharge tray 4 Conveyance path switching unit 5 Sorter unit 6 Paper supply unit 7 Paper supply unit 8 Recording medium 9 Transport direction inversion unit 10 Line image sensor 11 Transparent platen

Claims (3)

複数の長尺インクジェット記録ヘッドと記録媒体の排紙部に搬送方向反転機構を有するインクジェット記録装置において、搬送方向反転機構部にライン・イメージ・センサを設け、記録媒体の記録面を読み取ることを特徴とするインクジェット記録装置。In an ink jet recording apparatus having a plurality of long ink jet recording heads and a transport direction reversing mechanism in a discharge section of a recording medium, a line image sensor is provided in the transport direction reversing mechanism section to read a recording surface of the recording medium. Inkjet recording apparatus. 請求項1において、搬送方向反転機構内に自走式のライン・イメージ・センサを設け、搬送方向の反転のために記録媒体が停止中にライン・イメージ・センサを自走させて読み取ることを特徴とするインクジェット記録装置。2. The self-propelled line image sensor according to claim 1, wherein a self-propelled line image sensor is provided in the conveyance direction reversing mechanism, and the line image sensor is self-propelled and read while the recording medium is stopped for reversing the conveyance direction. Inkjet recording apparatus. 請求項1において、搬送方向の反転後、記録媒体を搬送しながらライン・イメージ・センサで読み取ることを特徴とするインクジェット記録装置。2. The ink jet recording apparatus according to claim 1, wherein after the recording medium is reversed, the recording medium is conveyed and read by a line image sensor.
JP2002350023A 2002-12-02 2002-12-02 Ink jet recorder Withdrawn JP2004181724A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009274321A (en) * 2008-05-14 2009-11-26 Tohoku Ricoh Co Ltd Inkjet printing apparatus
US20100299606A1 (en) * 2007-05-08 2010-11-25 Sony Computer Entertainment Inc. Multimedia reproduction apparatus, menu screen display method, menu screen display program, and computer readable recording medium recorded with menu screen display program
JP2013010243A (en) * 2011-06-29 2013-01-17 Canon Inc Inkjet recording apparatus and inkjet recording method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100299606A1 (en) * 2007-05-08 2010-11-25 Sony Computer Entertainment Inc. Multimedia reproduction apparatus, menu screen display method, menu screen display program, and computer readable recording medium recorded with menu screen display program
US8434007B2 (en) * 2007-05-08 2013-04-30 Sony Corporation Multimedia reproduction apparatus, menu screen display method, menu screen display program, and computer readable recording medium recorded with menu screen display program
JP2009274321A (en) * 2008-05-14 2009-11-26 Tohoku Ricoh Co Ltd Inkjet printing apparatus
JP2013010243A (en) * 2011-06-29 2013-01-17 Canon Inc Inkjet recording apparatus and inkjet recording method

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