JPS63257648A - Ink jet printer - Google Patents
Ink jet printerInfo
- Publication number
- JPS63257648A JPS63257648A JP9199187A JP9199187A JPS63257648A JP S63257648 A JPS63257648 A JP S63257648A JP 9199187 A JP9199187 A JP 9199187A JP 9199187 A JP9199187 A JP 9199187A JP S63257648 A JPS63257648 A JP S63257648A
- Authority
- JP
- Japan
- Prior art keywords
- head
- temperature
- memory
- ink
- value
- 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
- 238000010276 construction Methods 0.000 abstract 1
- 230000005284 excitation Effects 0.000 description 24
- 238000001514 detection method Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
-
- 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
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/34—Bodily-changeable print heads or carriages
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、インクジェットプリンターの制御に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to control of inkjet printers.
（従来の技術）
従来、インクジェットプリンターのヘッドを交換する場
合、そのヘッドの特性（振動子の励振電圧値等）を表示
しておき、交換者がその特性値になるよう交換の都度調
整していた。このため交換するには測定器が必要であっ
たり、専門家でないと交換できないという欠点があった
。また特性値は一点だけのため周囲条件等が変動した時
、そのセットした値が最適値とは限らず、印字の安定性
に欠けることがあった。(Prior art) Conventionally, when replacing the head of an inkjet printer, the characteristics of the head (such as the excitation voltage value of the vibrator) are displayed, and the person who replaces the head adjusts the head to match the characteristic value each time the head is replaced. Ta. For this reason, there were disadvantages in that a measuring device was required to replace it, and that it could only be replaced by an expert. In addition, since the characteristic value is only set at one point, when the surrounding conditions etc. change, the set value is not necessarily the optimum value, resulting in a lack of printing stability.
上述したことについて、さらに詳細にのべる。The above will be discussed in more detail.
第５図にインク温度Ｔ、に対する励振電圧Ｖ、の特性の
一例を示す、これは各温度に於けるインクの粒子化状態
を表わし、図のハツチング部分に励振電圧ｖＰが設定さ
れておれば、粒子化状態は無サテライト状態（領域）と
なり、安定した粒子化が行われる。しかし、この領域外
に励振電圧が設定されていると、サテライト（インク粒
子の後に更に粒子の径の小さな粒子が続く）が発生する
ようになり、文字信号に対応した荷電粒子が得られず、
印字の安定性がなくなる。そこで、現在は各温度でのこ
の無サテライト状態になる励振電圧の上限値Ｖ、ｗａｘ
および下限値Ｖ、ｗｉｎを測定し、使用する温度範囲の
中で、この範囲外に出ないような励振電圧ｖＰを設定し
ている。すなわち、第５図に於いて、Ｖ□とｖＰＬの中
間にＶｐの値を設定する。FIG. 5 shows an example of the characteristics of the excitation voltage V with respect to the ink temperature T. This represents the state of ink particle formation at each temperature. If the excitation voltage vP is set in the hatched part of the figure, The particle state becomes a satellite-free state (region), and stable particle formation is performed. However, if the excitation voltage is set outside this range, satellites (ink particles followed by smaller particles) will occur, making it impossible to obtain charged particles corresponding to character signals.
Printing becomes unstable. Therefore, at present, the upper limit value of the excitation voltage that causes this no-satellite state at each temperature, V, wax
and the lower limit value V, win are measured, and the excitation voltage vP is set so as not to go outside this range within the temperature range used. That is, in FIG. 5, the value of Vp is set between V□ and vPL.
ところが、このようにすると、この■ＰＲと■ＰＬの範
囲は各温度での範囲に比へて非常に狭いものとなってし
まい、他の変動要因、例えばインク圧力やインク粘度等
が変化した時、この設定電圧が無サテライト状態から外
れた領域にある可能性も出てくる。However, when doing this, the range of ■PR and ■PL becomes very narrow compared to the range at each temperature, and when other fluctuation factors such as ink pressure and ink viscosity change, , there is a possibility that this set voltage is outside the no-satellite state.
またこの場合、設定電圧は、各ヘッドについて各温度毎
にＶ、ｍａｘおよびＶ、ｍｉｎを測定し、これからｖｐ
Ｍおよびｖ、Ｌを求め、この両型圧のほぼ中間になるよ
うな値をＶ、とし、各ヘッド毎にこの値をマーキングし
ておき、装置に組込む時、このマーキングされた電圧に
なるよう、例えば高周波電圧計やオシロスコープで計測
して励振電圧をその都度調整しなければならない面倒さ
があった。In this case, the set voltage is determined by measuring V, max and V, min at each temperature for each head, and
Determine M, v, and L, and set the value that is approximately midway between these two mold pressures as V. Mark this value for each head, and when installing it into the device, make sure that the voltage is as marked. For example, there was the trouble of having to measure the excitation voltage with a high-frequency voltmeter or oscilloscope and adjust the excitation voltage each time.
（発明の目的）
本発明は、インクジェットプリンターのヘッドが持つ固
有の特性値データを記憶させたメモリーからデータを読
出し、これをもとにプリンタの制御を行い安定した印字
を行うことを目的とするものである。(Objective of the Invention) The object of the present invention is to read data from a memory that stores characteristic value data unique to an inkjet printer head, and control the printer based on this data to perform stable printing. It is something.
（発明の構成作用）
本発明は、インクジェットプリンターに於いて、そのヘ
ッドの持つ固有の特性値を交換可能なヘッドモジュール
のメモリーに記憶させておき、この記憶データをもとに
ヘッドに関する条件制御を行いうるようにして、安定し
た印字を行うものである。(Structure and Effect of the Invention) In an inkjet printer, the present invention stores unique characteristic values of the head in a memory of a replaceable head module, and controls conditions related to the head based on this stored data. This is to ensure stable printing.
（実施例）
第１図は本発明の一実施例の構成図を示し、１はヘッド
モジュールで、ヘッドｌａ、インクに振動をあたえる振
動子１ｂ、ノズルｌｃ、粒子化されたインク滴に文字信
号に応じた帯電を行う荷電電極１ｄ。(Embodiment) Fig. 1 shows a configuration diagram of an embodiment of the present invention, in which numeral 1 denotes a head module, including a head la, a vibrator 1b that gives vibration to the ink, a nozzle lc, and a character signal to the particulate ink droplets. A charging electrode 1d performs charging according to.
インク滴の飛翔方向を変える偏向電極１ｅ、印字に供さ
ないインク滴のあまりを回収するガター１ｆ。A deflection electrode 1e that changes the flying direction of ink droplets, and a gutter 1f that collects leftover ink droplets that are not used for printing.
温度センサー１ｇおよび本発明によるメモリー１ｈから
なる。It consists of a temperature sensor 1g and a memory 1h according to the invention.
装置全体の構成は、インク供給系（交さハツチング部分
）およびマイクロコンピュータ（以下、μＣＰＵという
）３を主体とする制御系とでなる。The overall configuration of the apparatus consists of an ink supply system (cross-hatched section) and a control system mainly composed of a microcomputer (hereinafter referred to as μCPU) 3.
前記インク供給系は、インクタンク２．加圧ポンプ２ａ
、圧力センサー２ｂおよびバルブ２ｃからなる。The ink supply system includes an ink tank 2. Pressure pump 2a
, a pressure sensor 2b and a valve 2c.
加圧ポンプは供給圧力が定められた圧力（メモリーから
読出された値）になるように圧力センサーの出力をもと
に制御される。The pressurizing pump is controlled based on the output of the pressure sensor so that the supply pressure becomes a predetermined pressure (value read from memory).
つぎに制御系は、μＣＰＵ３で装置全体の自動制御を行
い、インクジェット制御回路４はμＣＰＵ３の制御指令
により動作する。一方、インク圧力検出回路５からはイ
ンク圧力の状態、位相検出回路６からはインク滴の粒子
化状態に対して最適なタイミングで荷電が行われている
かどうかの位相検出出力の状態、温度センサー１ｇによ
るヘッド部の温度状態が温度検出口″Ｎ１７で検出され
、この値がＡ／Ｄコンバータ８でディジタル変換され、
以上の出力がインクジェット制御回路４に入力される。Next, in the control system, the μCPU 3 automatically controls the entire apparatus, and the inkjet control circuit 4 operates according to control commands from the μCPU 3. On the other hand, the ink pressure detection circuit 5 outputs the ink pressure status, the phase detection circuit 6 outputs the phase detection output status indicating whether charging is being performed at the optimal timing for the ink droplet atomization status, and the temperature sensor 1g. The temperature state of the head section is detected by the temperature detection port "N17," and this value is digitally converted by the A/D converter 8.
The above output is input to the inkjet control circuit 4.
この制御回路はこれら入力データをもとに振動子１ｂに
供給する励振電圧を発生する励振電圧発生回路１１およ
び加圧ポンプ２ａの圧力制御を行うポンプ制御口″Ｊ＠
１２のそれぞれについて制御を行う。This control circuit includes an excitation voltage generation circuit 11 that generates an excitation voltage to be supplied to the vibrator 1b based on these input data, and a pump control port "J@" that controls the pressure of the pressurizing pump 2a.
Control is performed for each of the 12.
また、インクジェット制御回路４は、荷電信号発生回路
１０を制御して荷電電極１ｄに文字信号に応じた電圧を
発生させ、粒子化されたインク滴に帯電させる。The inkjet control circuit 4 also controls the charging signal generation circuit 10 to generate a voltage in the charging electrode 1d according to the character signal, thereby charging the atomized ink droplets.
本発明はこのような構成において、ヘッドモジュール１
のメモリー１ｈと、これの読取、書込制御回路１３を備
え、μＣＰＵ３の指令にもとづきメモリーに記憶された
ヘッドの持つ固有の特性値データの読取り（必要により
書込み）を行い、その読取り出力をインクジェット制御
回路４に送り、ノズル１ｃから射出される粒子化された
インク滴（インクジェットｌｋ）が文字信号に応じて最
適に荷電され、しかも、励振電圧発生回路１１を制御し
て第５図に示す無サテライト状態（ハツチング領域）を
維持するよう励振電圧Ｖ、を発生させ振動子１ｂを励振
するものである。In the present invention, in such a configuration, the head module 1
It is equipped with a memory 1h and a read/write control circuit 13 for reading and writing the head's unique characteristic value data stored in the memory based on instructions from the μCPU 3 (writing as necessary), and transmitting the read output to the inkjet. The particulate ink droplets (inkjet lk) sent to the control circuit 4 and ejected from the nozzle 1c are optimally charged in accordance with the character signal, and the excitation voltage generation circuit 11 is controlled to generate the ink droplets shown in FIG. An excitation voltage V is generated to excite the vibrator 1b so as to maintain the satellite state (hatched region).
ここで、前記メモリー１ｈの記憶内容は第２図にその一
例を示すように、各アドレス０，１・・・・・・８にデ
ータが記憶され、そのデータ内容はμＣＰＵ３によって
判断され、加圧ポンプ２ａの圧力や各温度に設けるヘッ
ドの持つ固有の特性値である最適な励振電圧Ｖ、値が振
動子１ｂに加わるようになっている。Here, as an example of the memory contents of the memory 1h, as shown in FIG. 2, data is stored at each address 0, 1, . The optimal excitation voltage V, which is a characteristic value unique to the pressure of the pump 2a and the head provided at each temperature, is applied to the vibrator 1b.
つぎに温度センサー１ｇについてのべると、ここでヘッ
ドモジュール１のインク温度が検出され。Next, regarding the temperature sensor 1g, the ink temperature of the head module 1 is detected here.
前述した温度検出回路７．Ａ／Ｄコンバータ８を経てμ
ＣＰＵに入力され、検出温度に於けるｖｐ値をもとにイ
ンクジェット制御回路４で励振電圧発生回路１１を制御
し、第５図に示す無サテライト状態を維持するよう励振
電圧Ｖｐを制御する。Temperature detection circuit 7 mentioned above. μ via A/D converter 8
The excitation voltage generation circuit 11 is controlled by the inkjet control circuit 4 based on the vp value inputted to the CPU and detected at the detected temperature, and the excitation voltage Vp is controlled to maintain the no-satellite state shown in FIG.
つぎに１本実施例の動作を第３図および第４図に示すメ
インフロー、測定周期タイマー割込処理フローにもとづ
きのべる。まずメイン動作は、メモリー１ｈからインク
圧力データを読出し→加圧ポンプ制御回路１２のセット
−メモリーから温度Ｔ。Next, the operation of this embodiment will be described based on the main flow and measurement cycle timer interrupt processing flow shown in FIGS. 3 and 4. First, the main operation is to read the ink pressure data from the memory 1h -> set the pressure pump control circuit 12 - read the temperature T from the memory.
対励振電圧ｖＰ値の読出し→温度センサー１ｇにより温
度Ｔ、の測定→Ｔ、対ｖｐ値による励振電圧発生回路１
１のセット→加圧ポンプ２ａの駆動開始→振動子１ｂの
励振開始→μＣＰＵ３によるヘッドモジュール１に対す
る測定周期タイマーセット→スタートとなる。スタート
後は第４図に示すフローにもとづき常時、最適なＴ、対
Ｖ、値を維持すべく処理される。ここで、測定周期は任
意に設定が可能であり、圧力センサー２ｂの圧力Ｐはμ
ＣＰＵ３で判断され、第６図に示すｖＰ対Ｐにもとづき
圧力Ｐが範囲外のときは、圧力ポンプ２ａの駆動力を調
整し、また範囲内であるときは温度Ｔ、の判定が行われ
る。この温度測定値は前回測定値と比較を行い、温度Ｔ
、が現在セットされている温度範囲外であれば、新たに
測定温度Ｔ、に対するｖｐを励振電圧発生回路１１にセ
ットしてｖｐ値の調整を行う。また温度範囲内であれば
、ｖｐ値の調整を行わず割込処理を終了する。Reading of excitation voltage vP value → Measurement of temperature T by temperature sensor 1g → Excitation voltage generation circuit 1 based on T and vp value
1 → Start of driving the pressure pump 2a → Start of excitation of the vibrator 1b → Set measurement period timer for the head module 1 by μCPU 3 → Start. After the start, processing is always carried out to maintain the optimum T and V values based on the flow shown in FIG. Here, the measurement period can be set arbitrarily, and the pressure P of the pressure sensor 2b is μ
Based on the vP vs. P shown in FIG. 6, the CPU 3 determines that if the pressure P is outside the range, the driving force of the pressure pump 2a is adjusted, and if it is within the range, the temperature T is determined. This temperature measurement value is compared with the previous measurement value, and the temperature T
, is outside the currently set temperature range, a new vp for the measured temperature T is set in the excitation voltage generation circuit 11, and the vp value is adjusted. If the temperature is within the temperature range, the interrupt processing is ended without adjusting the vp value.
（発明の効果）
以上説明したように本発明はヘッドモジュール内のメモ
リーに各温度でのＶ、値を書込んでおき、このモジュー
ルをプリンターにセットして使用するとき圧力値とｖｐ
値をモジュール内のメモリーから読出し、このｖｐ値を
励振電圧発生回路にセットしてやることで、使用温度で
のそのヘッドに最適な励振電圧が印加され、安定な粒子
化状態が得られる。また、時々刻々に変化している粒子
化されたインク温度を一定周期ごとに測定を行い、それ
に伴って振動電圧をその時の最適値に設定するようにな
っているので、安定した印字を行うことができる。(Effects of the Invention) As explained above, the present invention writes the V and value at each temperature in the memory in the head module, and when this module is set in a printer and used, the pressure value and vp
By reading the value from the memory in the module and setting this vp value in the excitation voltage generation circuit, the optimum excitation voltage is applied to the head at the operating temperature, and a stable state of particle formation can be obtained. In addition, the temperature of the particulate ink, which changes from moment to moment, is measured at regular intervals, and the vibration voltage is set to the optimum value at that time, ensuring stable printing. Can be done.
第１図は本発明の一実施例の構成図、第２図はヘッドモ
ジュール内のメモリーに書込まれたデータの例を示す図
、第３図および第４図は第１図の動作フローを示し、第
３図はメインフロー、第４図は測定周期タイマー割込処
理フロー、第５図はインク温度Ｔ、に対する励振電圧ｖ
Ｐの関係を示す一例の特性図、第６図はポンプ圧力に対
する励振電圧の関係を示す図である。
１ ・・・ヘッドモジュール、 ｌａ・・・ヘッド。
１ｂ・・・振動子、１ｃ・・・ノズル、 ｌｄ・・・
荷電電極、ｌｅ・・・偏向電極、１ｆ・・・ガター、１
ｇ・・・温度センサー、１ｈ・・・メモリー、ｌｋ・・
・インクジェット、 ２・・・インクタンク、２ａ・・
・加圧ポンプ、２ｂ、・・・圧力センサー、２ｃ・・・
、バルブ、 ３ ・・・μＣＰＵ、４・・・インクジェ
ット制御回路、 ５ ・・・インク圧力検出回路、 ６
・・・位相検出回路、 ７・・・温度検出回路、 ８
・・・Ａ／Ｄコンバータ、 ９ ・・・高圧電源、１０
・・・荷電信号発生回路、１１・・・励振電圧発生回路
、１２・・・ポンプ制御回路、１３・・・読取。
書込制御回路。
特許出願人 株式会社 リ コ −
第２図
第３図 第４図FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a diagram showing an example of data written to the memory in the head module, and FIGS. 3 and 4 show the operational flow of FIG. 1. 3 is the main flow, FIG. 4 is the measurement cycle timer interrupt processing flow, and FIG. 5 is the excitation voltage v with respect to the ink temperature T.
An example of a characteristic diagram showing the relationship between P and FIG. 6 is a diagram showing the relationship between excitation voltage and pump pressure. 1...Head module, la...Head. 1b... vibrator, 1c... nozzle, ld...
Charging electrode, le... Deflection electrode, 1f... Gutter, 1
g...Temperature sensor, 1h...Memory, lk...
・Inkjet, 2... Ink tank, 2a...
・Pressure pump, 2b...Pressure sensor, 2c...
, valve, 3... μCPU, 4... inkjet control circuit, 5... ink pressure detection circuit, 6
...Phase detection circuit, 7...Temperature detection circuit, 8
...A/D converter, 9 ...High voltage power supply, 10
... Charge signal generation circuit, 11 ... Excitation voltage generation circuit, 12 ... Pump control circuit, 13 ... Reading. Write control circuit. Patent applicant Rico Co., Ltd. - Figure 2 Figure 3 Figure 4
Claims (1)
固有の特性値を交換可能なヘッドモジュールのメモリー
に記憶させておき、この記憶データをもとにヘッドに関
する条件制御を行いうるようにしたことを特徴とするイ
ンクジェットプリンター。In an inkjet printer, unique characteristic values of the head are stored in the memory of a replaceable head module, and conditions related to the head can be controlled based on this stored data. inkjet printer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9199187A JPS63257648A (en) | 1987-04-16 | 1987-04-16 | Ink jet printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9199187A JPS63257648A (en) | 1987-04-16 | 1987-04-16 | Ink jet printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63257648A true JPS63257648A (en) | 1988-10-25 |
Family
ID=14041915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9199187A Pending JPS63257648A (en) | 1987-04-16 | 1987-04-16 | Ink jet printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63257648A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04250066A (en) * | 1991-01-18 | 1992-09-04 | Canon Inc | Ink jet recording device |
| EP0571785A2 (en) * | 1992-05-29 | 1993-12-01 | SCITEX DIGITAL PRINTING, INC. (a Massachusetts corp.) | Print head assembly |
| US5485182A (en) * | 1988-12-29 | 1996-01-16 | Canon Kabushiki Kaisha | Liquid jet recording apparatus |
| JPH0948120A (en) * | 1995-08-09 | 1997-02-18 | Mita Ind Co Ltd | Recording head and ink jet recording apparatus |
| US5760797A (en) * | 1989-09-18 | 1998-06-02 | Canon Kabushiki Kaisha | Ink jet recording head with adjustable temperature sensor and ink jet recording system having the same |
| JPH11115217A (en) * | 1991-01-18 | 1999-04-27 | Canon Inc | Ink jet recorder |
| US6050669A (en) * | 1991-12-19 | 2000-04-18 | Canon Kabushiki Kaisha | Method of controlling an ink-jet recording apparatus according to recording apparatus in which the method is implemented |
| EP1234675A3 (en) * | 1989-08-05 | 2003-11-05 | Canon Kabushiki Kaisha | Ink jet recording apparatus and ink cartridge for the apparatus |
| WO2014156297A1 (en) * | 2013-03-29 | 2014-10-02 | 株式会社日立産機システム | Inkjet recording device |
-
1987
- 1987-04-16 JP JP9199187A patent/JPS63257648A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485182A (en) * | 1988-12-29 | 1996-01-16 | Canon Kabushiki Kaisha | Liquid jet recording apparatus |
| EP1234675A3 (en) * | 1989-08-05 | 2003-11-05 | Canon Kabushiki Kaisha | Ink jet recording apparatus and ink cartridge for the apparatus |
| US5760797A (en) * | 1989-09-18 | 1998-06-02 | Canon Kabushiki Kaisha | Ink jet recording head with adjustable temperature sensor and ink jet recording system having the same |
| JPH04250066A (en) * | 1991-01-18 | 1992-09-04 | Canon Inc | Ink jet recording device |
| JPH11115217A (en) * | 1991-01-18 | 1999-04-27 | Canon Inc | Ink jet recorder |
| US6050669A (en) * | 1991-12-19 | 2000-04-18 | Canon Kabushiki Kaisha | Method of controlling an ink-jet recording apparatus according to recording apparatus in which the method is implemented |
| US6476926B1 (en) | 1991-12-19 | 2002-11-05 | Canon Kabushiki Kaisha | Method and apparatus for controlling the amount of ink and the life of the printhead in an ink-jet recording apparatus |
| EP0571785A2 (en) * | 1992-05-29 | 1993-12-01 | SCITEX DIGITAL PRINTING, INC. (a Massachusetts corp.) | Print head assembly |
| EP0571785A3 (en) * | 1992-05-29 | 1995-04-05 | Eastman Kodak Co | Four inch print head assembly. |
| JPH0948120A (en) * | 1995-08-09 | 1997-02-18 | Mita Ind Co Ltd | Recording head and ink jet recording apparatus |
| WO2014156297A1 (en) * | 2013-03-29 | 2014-10-02 | 株式会社日立産機システム | Inkjet recording device |
| JP2014193568A (en) * | 2013-03-29 | 2014-10-09 | Hitachi Industrial Equipment Systems Co Ltd | Inkjet recording device |
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