TWI224559B

TWI224559B - Ink-jet print head and nozzle checking method thereof

Info

Publication number: TWI224559B
Application number: TW92137031A
Authority: TW
Inventors: Hsang-Pei Ou; Hui-Chen Chang
Original assignee: Ind Tech Res Inst
Priority date: 2003-12-26
Filing date: 2003-12-26
Publication date: 2004-12-01
Also published as: TW200520971A

Abstract

An ink-jet print head and a nozzle checking method thereof for determining the operating state of the nozzle of the ink-jet print head according to voltage outputted from a detection unit. When functioning abnormally, the nozzle is discarded, thus avoiding from degradation in printing quality.

Description

1224559 五、發明說明（1) 【發明所屬本發明關於一種偵【先前技術在電腦術係將精確放置於精確片輸出，還降低成本、目前喷是喷墨頭的喷墨頭的喷用印表機，【發明内容之技術領係有關於測喷孔工 ] 列印設備體積的微的特定位可滿足電降低時程墨頭之驅晶片並無孔異常時進而造成 ] 域】 —種喷墨頭及其控制方法，特別是有作狀態之喷墨頭及其控制方法。1224559 V. Description of the invention (1) [The invention belongs to a kind of detection [previous technology in the computer science department will be accurately placed on the precise film output, but also reduce costs. At present, the inkjet printer is an inkjet head that is an inkjet head. [Technical content of the invention is related to measuring orifices] The micro specific position of the volume of the printing equipment can meet the electrical reduction of the time history of the inkjet drive chip and there is no hole abnormality. [Domain] — an inkjet head And its control method, especially the inkjet head with working state and its control method.

之主流產品中，喷墨印表機之列印技量墨水液滴，快速地以電腦數值驅動置，不但可提供高解析度、全彩的圖子工業製造技術對自動化、微小化、、減少環境的衝擊等的要求與趨勢。動單元已結合於噴墨頭的晶片上。但法偵測出喷墨頭的喷孔狀態。因此當使用者無法即時得知，而仍繼績使列印品質的下降。有鑑於此，本發明之目的為提出一種檢查喷墨頭之喷孔工作狀態之方法及其裝置，主要是透過偵測單元的設置，用以檢測各個噴孔之工作狀態，讓使用者可即時得知喷孔異常。為達成上述目的，本發明方法適用之喷墨頭包括：複數位址線、複數選擇線、複數喷墨單元以及複數驅動單元。喷墨單元，對應於該等位址線及該等選擇線而設置，各該嘴墨單元具有一喷孔。複數驅動單元，分別輕接於該等選擇線與一第一電源之間，其中，該第一電源具有二^ 一電壓，用以提供電流驅動（f i r i ng)該等喷孔。該方法包Among the mainstream products, the inkjet printer's printing technology measures ink droplets, which are quickly driven by computer values. Not only can it provide high-resolution, full-color graphics. Industrial manufacturing technology can reduce automation, miniaturization, and reduce the environment. Requirements and trends. The moving unit has been integrated on the wafer of the inkjet head. However, the nozzle state of the inkjet head cannot be detected. Therefore, when the user cannot know in real time, and the subsequent performance still reduces the print quality. In view of this, the purpose of the present invention is to provide a method and a device for checking the working state of the nozzle holes of an inkjet head, which are mainly used to detect the working state of each nozzle hole through the setting of a detection unit, so that users can immediately Learned that the nozzle was abnormal. To achieve the above object, the inkjet head to which the method of the present invention is applicable includes: a plurality of address lines, a plurality of selection lines, a plurality of inkjet units, and a plurality of drive units. The inkjet unit is provided corresponding to the address lines and the selection lines, and each of the nozzle ink units has an ejection hole. The plurality of driving units are respectively lightly connected between the selection lines and a first power source, wherein the first power source has a voltage of two to provide current to drive the spray holes (f i r i ng). The method package

0338-A20177TWF(Nl);08-920090;joanne.ptd 第4頁 12245590338-A20177TWF (Nl); 08-920090; joanne.ptd Page 4 1224559

五、發明說明（2) 括下列步驟 (a )提供複數偵測單元，分別並連該等驅動單—· (b) 施加資料信號至該等選擇線之一，並配〜址信號至該等位址線，以驅動（f i r i ng )對應之噴^^加疋 (c) 分析對應該喷孔而設之偵測單元所輪出之以判斷該喷孔之狀態是否正常。壓，當該偵測單元輸出之電壓實質上等於該第一電壓，判定該喷孔為異常；當該偵測單元輸出之電壓不等$該= 一電壓，則判定該喷孔為正常。 ^ & 為達成上述目的，本發明提出之具有檢查噴孔工作狀怨之噴墨頭，包括：複數位址線（address line)、複數選擇線（bank 1 ine)、複數喷墨單元、複數驅動單元以及複數彳貞測單元。噴墨單元，對應於該等位址線及該等選擇線而设置，各該噴墨單元具有一喷孔。驅動單元，分別耦接於該等選擇線與一第一電源之間，用以提供電流驅動 U 1 r 1 ng)該等喷孔，該第一電源具有一第一電壓。偵測單元，分別並連該等驅動單元。 ^遠等喷孔正常時，該偵測單元輸出一第二電壓不等於4第一電壓’當該等喷孔異常時，其所對應之該偵測單元則輸出一貫質上等於該第一電壓之第三電壓。為讓本發明之上述和其他目的、特徵、和優點能更明顯易懂，下文特舉出較佳實施例，並配合所附圖式，作詳細說明如下：V. Description of the invention (2) Include the following steps (a) Provide a plurality of detection units, and connect these driving orders separately-(b) Apply a data signal to one of these selection lines, and assign a ~ address signal to these The address line is driven by spray (firi ng) corresponding to ^^ plus c (c) Analyze the rotation of the detection unit corresponding to the spray hole to determine whether the condition of the spray hole is normal. Pressure, when the voltage output by the detection unit is substantially equal to the first voltage, it is determined that the nozzle is abnormal; when the voltage output by the detection unit is not equal to $ this = a voltage, it is determined that the nozzle is normal. ^ & In order to achieve the above-mentioned object, the inkjet head with inspection nozzle working condition proposed by the present invention includes: a plurality of address lines, a plurality of selection lines (bank 1 ine), a plurality of inkjet units, a plurality of A drive unit and a plurality of measurement units. The inkjet units are provided corresponding to the address lines and the selection lines, and each of the inkjet units has an ejection hole. The driving unit is respectively coupled between the selection lines and a first power source for providing a current to drive the spray holes U 1 r 1 ng). The first power source has a first voltage. Detect units, and connect these drive units in parallel. ^ When the nozzle is normal, the detection unit outputs a second voltage not equal to 4 the first voltage. When the nozzles are abnormal, the corresponding detection unit outputs a quality that is consistently equal to the first voltage. Third voltage. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments in combination with the accompanying drawings for detailed descriptions as follows:

1224559 五、發明說明（3) 【實施方式】第1圖顯示本發明之喷墨頭架構。如圖所示，喷墨包括：位址線（address line)Al~An、選擇線（bank、土、 1 一ine^Si PSm、喷墨單元uu〜Unm、驅動單元I〜匕以及偵兀IVDm。喷墨單元Uu〜Unm，對應於位址線^〜乂及選擇線、 ^SlLPSmT而設置。例如位址線Αι和選擇線PS!可以用來控制噴墨早兀uu。透過位址線Αι〜Αη上的定址信號，可導通/贺同一列（亦即同一位址線）上的喷墨單元U 。；間内’選擇線PSl〜PSm亦有一條選擇線會送出資料在信如圖所喷墨單SUn包括：電晶•及—嘴孔，盆中，贺孔可等效成電阻Rn。驅動單，鉍，、擇線PSrPS盥一第一電懕v夕„ m 1 m刀別輕接於選 rf. . \ 弟之間，用以提供電流驅動 (firing)噴孔。偵測單sD d ，一^ 根據喷孔之狀態，送出電懕/名If f連駆動早#〜Pm，狀〜运出寬予外部處理裝置2 〇 s喷孔正常時，偵測單元h〜D所所第一電壓V ，當喷孔里常日丰 J 貝貝上不等於认h ; 、吊寸’其所對應之偵測單亓Γ» η ^ 輸出之電壓實質上等於第一電壓。早疋D广Dm所 ::而：’假設，，驅動單：p:送出 U"之贺孔。當喷孔正常時，ι$墨早兀 M m ^ ^ , 才由於電流流經電阻Rn合逄吐熱，因而噴出墨水，並且 11 θ產生 ^ χ^τ -Ζ1 η ^ 谓/則卓兀D〗輸出一第二雷厭 §喷孔/、吊日寸，則電流無法妹。 k。 D!輸出一第三電壓。、、二電阻R11因此，偵測單元外部處理裝置2根據偵、、目,丨w 一 n 爆偵測早兀D1所測得之電壓，判斷喷1224559 V. Description of the invention (3) [Embodiment] FIG. 1 shows an inkjet head structure of the present invention. As shown in the figure, the inkjet includes: address lines Al ~ An, selection lines (bank, soil, 1-ine ^ Si PSm, inkjet unit uu ~ Unm, drive unit I ~ dagger, and detection IVDm The inkjet unit Uu ~ Unm is set corresponding to the address line ^ ~ 乂 and the selection line, ^ SlLPSmT. For example, the address line Αι and the selection line PS! Can be used to control the inkjet early uu. Through the address line Αι The addressing signal on ~ Αη can turn on / off the inkjet unit U on the same column (that is, the same address line); There is also a selection line PS1 ~ PSm in the room, and a selection line will send data in the letter as shown in the figure The inkjet sheet SUn includes: a transistor and a mouth hole, a bowl, and a hole can be equivalent to a resistance Rn. The driving single, bismuth, and selective line PSrPS are the first electric wires. M 1 m Connected between the selected rf.. \, To provide current-driven firing holes. Detect the single sD d, a ^ according to the state of the nozzle, send out the electric card / name If f 连駆动早 # ~ Pm, State ~ shipped wide to the external processing device 2 0s when the nozzle is normal, the detection unit h ~ D is the first voltage V, when the nozzle is often on the day of the J J Bebe not equal to h; ， Hanging inch 'and its corresponding detection unit 亓 Γ »η ^ The output voltage is substantially equal to the first voltage. As early as possible, D Guang Dm :: and:' assume, driving unit: p: Send U " Congratulations When the nozzle hole is normal, the ink is discharged because the current flows through the resistor Rn and the heat is emitted, so the ink is ejected, and 11 θ produces ^ χ ^ τ -Z1 η ^ Wu D〗 Outputs a second thunder bore § Nozzle /, hanging day, the current can not be. K. D! Outputs a third voltage. Two resistors R11 Therefore, the external processing device 2 of the detection unit is based on the detection, 、目, 丨 w-n burst detection voltage detected by early D1, judge spray

五'發明說明（4) =疋否正常。當外部處理裝置所接收到的電壓^丨不等於第一壓田口p處理裝置2 常。 51个寻及弟電壓Vcc時，則表示噴孔正圖顯示本發明之偵測單元之實施例。。 1〜m之結構相同，因此，僅以谓；:早動早πρι及喷墨單元ϋη，加以說明。上叱σ 糸由^測早疋Dl包括：電阻Ra、Rb及開關Τ2。電阻R、R 壓輸出至外部處理裝置2。或是，外部處 Γ體而=節點3之電壓。開㈣可為-功率較小= 驅動單叫係為-電晶體I，由於驅動單元〇 ::予：:”別11，因此，電晶體Τι需具有承受大電流之V =。叙权，電阻Ra、Rb之阻值相同（約在1ΜΩ以上），並且電壓k為1 2 V。當控制信號Ci被致能時，則電晶體τ及開關T、2,用以提供節點3之電壓予外部處理裝置2。 §喷孔正吊時，則電晶體乃所提供之電流將流過電阻 Rll。此時’第—電壓Vcc、經過電阻Ra、Rb分壓後，節點3之電壓約為6V。因此，外部處理裝置2所接收之電壓I約為 6V。當喷孔異常時，則電阻Ru視為斷路，因此，電晶體1 所提供之電流無法流過電阻Rii。造成節點2及節點3之電壓為均1 2 V，因此開關T2輸出至外部處理裝置2的電壓I為Five 'invention description (4) = whether it is normal. When the voltage received by the external processing device is not equal to the first pressure field port p processing device 2 always. When the 51 voltages Vcc are found, it indicates that the spray hole front view shows an embodiment of the detection unit of the present invention. . The structures from 1 to m are the same, so only the predicate is used;: early action early πρι and the ink jet unit ϋη will be described. The upper threshold σ is measured from the early phase D1, which includes resistors Ra, Rb, and switch T2. The resistance R, R voltage is output to the external processing device 2. Or, the external Γ body = the voltage of node 3. The opening can be-small power = drive unit is-transistor I, because the drive unit 0 :: yo :: "below 11, so the transistor T must have a high current V =. Syria, resistance The resistance values of Ra and Rb are the same (above about 1MΩ), and the voltage k is 12 V. When the control signal Ci is enabled, the transistor τ and the switches T and 2 are used to provide the voltage of node 3 to the outside Processing device 2. § When the spray hole is hanging, the current provided by the transistor will flow through the resistor R11. At this time, the voltage of node 3 is about 6V after the voltage of the first voltage Vcc is divided by the resistors Ra and Rb. Therefore, the voltage I received by the external processing device 2 is about 6V. When the nozzle hole is abnormal, the resistance Ru is regarded as an open circuit. Therefore, the current provided by the transistor 1 cannot flow through the resistance Rii. The voltage is 1 2 V, so the voltage I output from the switch T2 to the external processing device 2 is

0338-A20177TWF(Nl);08-920090-j〇anne.ptd 第7頁 1224559 五、發明說明（5)0338-A20177TWF (Nl); 08-920090-j〇anne.ptd Page 7 1224559 V. Description of the invention (5)

12V 之電上？： Ϊ，ΐ噴孔正常時，外部處理裝置2所接收 =電£V51小於弟一電壓Vcc ;而當喷孔異常時，置2所接收之電壓L約於箓 m L 丨處里展邱；^捶狀罢9祕拉Γ 4 一電壓Vcc。因此，只需判斷外 ::处里衣置2所接收之電壓Vsi，便可輕易得知噴孔之狀 =當外部處理裝置2發覺噴孔異常時予異常之喷孔。卜丹從供逼/仙另外，當喷孔趨於異常時，節點3之電壓會慢三因此，透，本發明，外部處理裝置2亦可告知^用者目則喷孔之狀態，讓使用者可儘早作相關處理。在本實施例中，偵測單元以所輸出之電壓係 Ra、Rb分壓後之電壓；但偵測單亓Φ亚技 ^ t 1貝列早^Di主要係用以提供一雷壓予外部處理裝置2判斷，因此，侈測單所組成。 1貝成1早兀D1亦可由其它元件第3圖顯示本發明之檢查喷墨頭之喷孔的方法浐 f。請參考幻圖’本發明之檢查方法所適用之噴^ 括：位址線\〜\及選擇線PS1〜Psm、噴墨單元以及驅動單元VPm。其中，喷墨單元H，對應於位址⑽ 及選擇線PS1〜ps„而設置。噴墨單元Un〜Unm具有一喷孔。驅動單元Pl~Pm，分別耦接於選擇線PS广pSm與一第—電壓之間，用以提供電流驅動（firing)噴孔。本發明之方法，包括下列步驟：步驟100 :提供偵測單元&〜!)„，分別並聯於驅動單元 Pi〜，然後執行步驟11 〇。12V power? : Ϊ, when the spray hole is normal, the external processing device 2 receives = electricity £ V51 is less than the primary voltage Vcc; and when the spray hole is abnormal, the voltage L received by the 2 is about 箓 m L ^ 捶 9 strikes Γ 4 a voltage Vcc. Therefore, just by judging the voltage Vsi received by the outer :: lining 2, you can easily know the shape of the nozzle hole = when the external processing device 2 detects that the nozzle hole is abnormal, give an abnormal nozzle hole. In addition, when the spray hole tends to be abnormal, the voltage of node 3 will be slower. Therefore, according to the present invention, the external processing device 2 can also inform the user of the state of the spray hole and let the user use it. Those who can deal with it as soon as possible. In this embodiment, the detection unit uses the output voltage to be the voltage divided by Ra and Rb; however, the detection unit 亓 Φ sub-technology ^ t 1 Bayer early ^ Di is mainly used to provide a lightning pressure to the outside The processing device 2 judges that, therefore, it consists of a luxury test sheet. 1 to 1 D5 can also be composed of other components. Figure 3 shows the method of inspecting the nozzle holes of the inkjet head according to the present invention. Please refer to the magic picture, the spraying method applicable to the inspection method of the present invention includes: address lines \ ~ \ and selection lines PS1 ~ Psm, inkjet unit and driving unit VPm. The inkjet unit H is provided corresponding to the address ⑽ and the selection lines PS1 to ps. The inkjet units Un to Unm have a nozzle hole. The driving units P1 to Pm are respectively coupled to the selection lines PS and pSm and one. The first voltage is used to provide a current-driven firing orifice. The method of the present invention includes the following steps: Step 100: Provide a detection unit & ~!), Respectively, in parallel with the drive unit Pi ~, and then execute Step 11

03 38-A20177TWF(N1);08-920090;j oanne.p t d03 38-A20177TWF (N1); 08-920090; j oanne.p t d

五、發明說明（6) 並施：;:二號提至，號至選擇_〜p…之—，後執行步騾〗2 (/。、 1 An，以驅動所對應之喷孔，然步驟1 2 〇 · 輸出的電财51，根判據斷對嗔應孔於喷孔而設置u ^ 之電麼VS1約等於第一電=狀態。當伯測單元D,〜Dm所輪出 ★込所輪出之電壓v於則執行步驟。當偵測單】4〇。 51 J、於苐—電壓時，則執行步驟步驟1 3 〇 ··判定喷 ^ 料信號無法傳送至？異$。、由於喷孔發生異常時，資電壓L等於第一電壓。因造成偵測單元A〜Dm所輸出之處理裝置2即時作出相關處理。當嘴孔阻塞時，可藉由外部步驟14 0 :判定喷 a ，收資料信號，使得偵測單二當喷孔正常時，可正確接，。接著執行步驟U0，再1提;所义出之電·V51小於第— Psr psm，用以繼續判斷其孔號至其它選擇線本發明之檢查方法σ 噴孔之狀態。查。等到所有噴孔均完：Π:者-開機時’便開始檢是由使用者決定何時才要：：：本方能開始列印資料。或有η條’而選擇線^條要=程序。假設，位址線共透過本發明，使一η X m次。噴孔的數量大於-預設值:寺，P】：：噴孔之狀態’當異常 :外部處理裝置亦可在喷m時更換噴墨頭。、予異常噴孔，以避免噴孔異常時孔不再提供電厅乂成的列印品質不第9頁 0338-A20177TWF(Nl);08-920090u〇anne.ptd 1224559 五、發明說明（7) 佳之現象。雖然本發明已以較佳實施例揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍内，當可作些許之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。V. Description of the invention (6) Simultaneous application:;: No. 2 to, No. to choose _ ~ p ... of —, and then execute step 骡 2 (/., 1 An to drive the corresponding nozzle, and then step 1 2 〇 · The output of electrical power 51, according to the criterion, set the electric power u ^ corresponding to the hole in the spray hole. VS1 is approximately equal to the first power = state. When the primary measurement unit D, ~ Dm are turned out. When the voltage v is in turn, the step is performed. When the detection sheet is 4 0. 51 J. In the case of the voltage, the step 1 is performed. It is determined that the spraying signal cannot be transmitted to? When an abnormality occurs in the nozzle hole, the voltage L is equal to the first voltage. As a result, the processing device 2 output by the detection units A to Dm makes relevant processing in real time. When the nozzle hole is blocked, the external step 14 0: Judgment of the nozzle a, receive the data signal, so that the detection single two can be correctly connected when the nozzle is normal. Then go to step U0, and mention again; the defined electricity · V51 is less than the first — Psr psm, to continue to judge its hole No. to other selection lines The inspection method of the present invention σ The state of the orifice. Check. Wait until all orifices are completed: Π: -when the machine is turned on, it will start. It is up to the user to decide when to ::: I can start printing data. Or there are η 'and the selection line ^ == procedure. Assume that the address line passes through the present invention a total of η X m times. The number of nozzle holes is greater than-the default value: Temple, P] :: the state of the nozzle holes' when abnormal: the external processing device can also replace the inkjet head when spraying m. ， Give abnormal nozzle holes to avoid abnormal nozzle holes Holes no longer provide print quality produced by the Electric Hall. Page 9 0338-A20177TWF (Nl); 08-920090uanne.ptd 1224559 V. Description of the invention (7) The best phenomenon. Although the present invention has been described in a preferred embodiment The disclosure is as above, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be regarded as the attached application. The patent scope shall prevail.

0338-A20177TWF(Nl);08-920090u〇anne.ptd 第10頁 1224559 圖式簡單說明第1圖顯示本發明之喷墨頭架構。第2圖顯示本發明之偵測單元之實施例。第3圖顯示本發明之檢查喷墨頭之喷孔的方法流程圖00338-A20177TWF (Nl); 08-920090uanne.ptd Page 10 1224559 Brief Description of Drawings Figure 1 shows the inkjet head architecture of the present invention. FIG. 2 shows an embodiment of the detection unit of the present invention. FIG. 3 shows the flow of the method for inspecting the nozzle holes of the inkjet head according to the present invention. FIG. 0

【符號說明 ] A1〜 An〜位址線； PSi ~PSm 〜選擇線； 1、 v喷墨頭； 2、 -外部處理裝置 Un 〜Unm〜喷墨單元 V pm〜驅動單元； Dr Dm〜偵測單元； Qll 〜控制電晶體； Ti，〜電晶體， Rll 、1 、Rb〜電阻 T2 / 〜開關。 0338-A20177TWF(Nl);08-920090;joanne.ptd 第11頁[Symbols] A1 ~ An ~ Address line; PSi ~ PSm ~ Selection line; 1. v inkjet head; 2.-External processing device Un ~ Unm ~ inkjet unit V pm ~ drive unit; Dr Dm ~ detection Unit; Qll ~ control transistor; Ti, ~ transistor, Rll, 1, Rb ~ resistor T2 / ~ switch. 0338-A20177TWF (Nl); 08-920090; joanne.ptd Page 11

Claims

1224559 六、申請專利範圍 -—--~— 括· 1 ·種喷墨頭’具有檢查喷孔工作狀態之功能，包複數位址線（address line)及複數選擇線（bank line); 複數噴墨單元，對應於該等位址線及該等選擇線而設各邊喷墨單元具有一噴孔；複數驅動單元，分別耦接於該等選擇線與一第一電源 ^ 用以提供電流驅動（f i r i n g)該等喷孔，該第一電源具有一第一電壓；複數偵測單元，分別並連該等驅動單元；當該等噴孔 =$ 4 ’該偵測單元輸出一第二電壓不等於該第一電壓，當^等噴孔異常時，其所對應之該偵測單元則輸出一實質上等於該第一電壓之第三電壓。抑2 ·如申請專利範圍第1項所述之喷墨頭，其中各該驅動單元為一第一電晶體，各該偵測單元係由一第一電阻串接弟一電阻而構成，該第一及第一電阻之連接點係為該摘測單元之輸出端。 3 ·如申請專利範圍第2項所述之喷墨頭，其中各該偵测單元之輸出端更耦接一第二電晶體之第一端，該第二電晶體之控制極耦接該第一電晶體之控制極，所有該第二電晶體之第二端均耦接一起。 4 · 一種檢查喷墨頭之喷孔狀悲之方法’該喷墨頭包括複數位址線及複數選擇線；複數喷墨單元，對應於該等位址線及該等選擇線而設置，各該喷墨單元具有一喷孔；以1224559 VI. Application scope of patents ----- ~-Including · 1 · A kind of inkjet head has the function of checking the working state of the nozzle, including multiple address lines and multiple selection lines (bank lines); Ink unit, corresponding to the address lines and the selection lines, each side of the inkjet unit has a nozzle; a plurality of driving units, respectively coupled to the selection lines and a first power source ^ for providing current driving (Firing) the spray holes, the first power source has a first voltage; a plurality of detection units are connected in parallel with the driving units respectively; when the spray holes = $ 4 'the detection unit outputs a second voltage not It is equal to the first voltage. When the nozzle hole is abnormal, the corresponding detection unit outputs a third voltage that is substantially equal to the first voltage. 2. The inkjet head described in item 1 of the scope of patent application, wherein each of the driving units is a first transistor, and each of the detecting units is constituted by a first resistor connected in series with a resistor. The connection point of the first and first resistors is the output terminal of the test unit. 3. The inkjet head according to item 2 of the scope of patent application, wherein the output end of each detection unit is further coupled to the first end of a second transistor, and the control electrode of the second transistor is coupled to the first transistor. The control electrodes of a transistor, and the second terminals of all the second transistors are coupled together. 4 · A method for checking the nozzle hole shape of the inkjet head 'The inkjet head includes a plurality of address lines and a plurality of selection lines; a plurality of inkjet units are provided corresponding to the address lines and the selection lines. The inkjet unit has a spray hole;

0338-A20177TWF(Nl);08-920090;joanne.ptd 第 12 頁 1224559 六、申請專利範圍及，複數驅動單元，分別耦接於該等選擇線與一第一電源之間，用以提供電流驅動（f i r i ng )該等喷孔，該第一電源具有一第一電壓；該方法包括下列步驟：提供複數偵測單元，分別並連該等驅動單元；施加資料信號至該等選擇線之一，並配合施加定址信號至該等位址線，以驅動（f i r i ng)對應之喷孔；分析對應該喷孔而設之偵測單元所輸出之電壓，以判斷該喷孔之狀態是否正常。 5.如申請專利範圍第4項所述之檢查喷墨頭之喷孔狀態之方法，其中，當該偵測單元輸出之電壓實質上等於該第一電壓，則判定該喷孔為異常；當該偵測單元輸出之電壓不等於該第一電壓，則判定該喷孔為正常。0338-A20177TWF (Nl); 08-920090; joanne.ptd Page 12 1224559 6. Scope of patent application and multiple drive units are respectively coupled between these selection lines and a first power supply to provide current drive (Firi ng) the spray holes, the first power source has a first voltage; the method includes the following steps: providing a plurality of detection units, each of which is connected in parallel with the drive units; applying a data signal to one of the selection lines, Cooperate with the application of address signals to these address lines to drive the corresponding nozzles; analyze the voltage output by the detection unit corresponding to the nozzles to determine whether the state of the nozzles is normal. 5. The method for checking the nozzle hole state of the inkjet head as described in item 4 of the scope of the patent application, wherein when the voltage output by the detection unit is substantially equal to the first voltage, the nozzle hole is determined to be abnormal; If the voltage output by the detection unit is not equal to the first voltage, it is determined that the spray hole is normal.

0338-A20177TWF(Nl);08-920090;joanne.ptd 第13頁0338-A20177TWF (Nl); 08-920090; joanne.ptd Page 13