1250088 九、發明說明： 【發明所屬之技術領域】 、本^明為一種噴墨頭驅動方法和電路，該喷墨頭依據一喷 墨印表系統所輸出之複數個第一選擇訊號和複數個第二選擇訊 號’對一媒體進行列印。 【先前技術】 I1現著個人電腦的蓬勃發展，印表機已成為一種普遍的設 備而噴墨印表機又以其低價位及豐富的色彩打入一般消費者 家庭，因此各家廠商為了改善其產品的列印品質紛紛發表許多 新的列印技術，而增加噴墨頭内控制的滴墨產生單元（ink droplet generator )以提高列印品質的技術便是其中一種。 習知關於喷墨頭（Print Head)控制滴墨產生單元數目的技 術上，往往受限於位址線（address line)和圖元選擇線（primitive select line)的數目，而位址線和圖元選擇線的數目又受限於喷 墨頭與印表機連接的輪入/輸出腳（I/O pins，以下簡稱"ο數）。 請參考第1圖°第1圖為-習知喷墨頭内控制滴墨產生單元的 電路圖。以本電路圖為例，本電路圖為6條位址線（A1〜A6) 與3條圖元選擇線CPS1〜PS3)所組成，可控制18個滴墨產生 單元π。如果依照傳統方式，想要增加控制的滴墨產生單元讥 則必須增加位址線和圖元選擇線的數目，如此一來喷墨頭與印 表機連接的I/O數也勢必大幅增加。雖然今日製程技術進步， 使得增加位址線和圖元選擇線的數目是可以達成的，但是過多 的I/O數對於系統控制或是韌體撰寫上都可能造成無法預 狀況，而且I/O數的增加也造成喷墨頭連接印表機系統的位址 0338-A20734TWF(N2)；08-930056；brent 5 125〇〇88 線和圖元選擇線的接點增加，也會使得接觸不良的情形更容易 發生’以及連接埠接點過多的困擾。因此如何在有限的位址線 和圖元選擇線中控制最多的滴墨產生單元是本發明的一個重要 動機。 睛麥考第2圖。第二圖為US Pat.NO· 6176569專利的一電 路杀構圖。该專利係利用區塊（Bank )的觀念，將所有滴墨產 生單元區为成2個區塊，再利用兩條外加的區塊線（Bank Hne )， 區塊線1和區塊線2來控制，使得在相同數目位址線的情形下 可以控制更多的滴墨產生單元。該專利的實施是在位址線上串 聯一 M0S開關，且同一個區塊内的所有連接到滴墨產生單元的 位址線上所串聯的M0S開關的閘極都由相同的區塊線控制，在 每一個滴墨產生單元的控制上除了原先的位址線和圖元選擇線 外，還必須搭配區塊線的開關輸入，才能使位址線的訊號輸入 到功率M0S的閘極，使得滴墨產生單元滴墨（化丨％ )。利用這 方式僅需要增加區塊線的數目便可使噴墨頭控制的滴墨產生單 元數目成倍數增加。 然而上述專利雖能增加喷墨頭所控制的滴墨產生單元數 目，但是以增加外來電路為主要方式，不僅增加了 1/〇數目， 也造成系統控制上較為複雜。如果有任何一條區塊線故障損 壞，則造成整個區塊的滴墨產生單元無法使用，對於製造商在 製造時也承擔更高的風險。因此本發明提供一種在不增:αι/〇 數目下，以現有的位址線控制更多數目的滴墨產生單元曰的方法 與電路。 / 【發明内容】 本發明的目的為提供一種在不增加1/〇數目下，以現有的 0338-A20734TWF(N2)；08~930056；brent 6 1250088 位址線控制更多數目的滴墨產生單元的方法與電路。 依據本發明的要點，，一 ^ W If- ±J^ _μ 出之㈣個-一阳 育墨印表系統所輸 — 罘廷擇訊號和複數個第二選擇訊號，對一媒體進 仃列印，包括：複數條第一驅動線，福接該等第一選 禝數個控制早凡，分別輕接複數個控制訊號組，用以產生複^數 2軸訊號；其中，每—該等控制訊號組包括複數個相異的該 弟一選擇訊號；複數條第二驅動線，搞接該等致動訊號；以 唬之控制，選擇性地對該媒體進行列印。 根據本發明另—要點，本發明亦提供一種喷墨頭内滴墨產 生早凡的驅動方法’用以增加滴墨產生單元的控制數目，該喷 ，頭«-噴墨印表機系統所輸出之複數個第一選擇訊號和複 ^固第二選擇訊號，對一媒體進行列印，該喷墨頭包含複數條 一驅動線、複數條第二驅動線以及複數個低墨產生單元，該 方法包括下列步驟：施加該等第一選擇訊號至該等對應第一驅 動線^供複數控制訊號組，用以產生複數個㈣㈣，·其中， 母一該等控制信號組包括複數個相異的該等第二選擇訊號丨以 及施加該等致動訊號至該等第二驅動線，使得該等滴墨產生單 元回應該等第-選擇訊號和該等致動訊號之控制，選擇性地對 5亥媒體進行列印。 【實施方式】 士為使本發明之上述目的、特徵和優點能更明顯易懂，下文 4寸舉出本發明之較佳實施例，並配合所附圖式，作詳細說明如 下： 明芩考第3圖。第3圖為本發明之第一個實施例的電路圖。 0338-A20734TWF(N2)；08-930056；brent ， 1250088 該電路為利用與第！圖相同數目的6條位址線（A1〜A6)，利用 兩條位址線解碼出15個致動訊號（C1〜ci5 )，再搭配3條圖元 遥擇線（PS1〜PS3 )來控制滴墨產生單元，在應用本發明後可控 制的滴墨產生單元數目提高到45個，比第i圖電路中可控制Μ 個滴墨產生單元的數目還要多。第3圖中致動訊號依序為ci. (A2，A1 )、C2· ( A3，A1 )、C3. ( A4，A1 )、C4_ ( A5，A1 )、c5· (A6，A1 )、C6· ( A3，A2 )、C7· ( A4，A2 )、C8. ( A5，A2 )、c9. (A6，A2)、CIO· (A4，A3)、Cll. (A5，A3)、C12· (A6，A3)、C13. (A5,A4 ) C14· ( A6，A4 )、C15. ( A6，A5 )，在上列表中括號右 側之位址線連接MOS電晶體之閘極（Gate)，括號左侧之位址 線連接MOS電晶體之汲極（Drain)。印表機系統運作時會循序 地致能致動訊號C1〜C15,此時若圖元選擇線PS1〜pS3上傳送的 訊號為High時，表示其對應之滴墨產生單元滴墨（Firing)。以 滴墨產生單31⑸列，當位址、線A1與A2致能使得致動訊號 ci致能，此時圖元選擇線PS1亦致能時，則該滴墨產生單元η 便滴墨（Firing )。 為了更清楚表示上述訊號動作，請參考第4圖。第4圖為 驅動第3圖喷墨頭電路的訊號波形圖，A1〜A6為位址線之訊號， psi〜ps^為圖元選擇線之訊號。當位址線A1致能時，位址線 A2〜A6循序地被致能，其被致能的時間為一致能週期κ。在 (A2，A1)的致能週期（亦即致動訊號C1的致能週期）中，By 和PS3訊號線為Hlgh，此時致動訊號C1. ( A2，A1)與ρ§ι和 PS3連接之滴墨產生單元便會滴墨。繼續第4目，在致動訊號 C5. (A6，A1)的致能週期結束後，到致動訊號c6 (幻之 間會產生-延遲時心。這是因為喷墨頭控制單元需先㈣址 線A6所連接之汲極⑽掉，接著位址線M才會被_，這是 0338-A20734TWF(N2)；08-930056；brent 1250088 避免當（A6，A1)同時〇FF時 ’ ::二物”P時發生錯誤。同樣的情形 a 6，A3)' C14· (A6,A4) C15. (A6,A5) ^ ΓοΓ 的難⑽掉，核輯電晶體_的位址 綠OFF。如此從c 1 Γ Λ 9 a η , ·(，）的致能週期開始一直到C15. 列印、，立址線A5被⑽掉，這樣的-個時間便稱為-個 印表機系統在列印時便重複這樣的列印 到列印工作結束。 ’直 具库：t述貫施例中可以知道，該實施例中-個列印週期。的 、又為5個致能週期工加上5個延遲時間^ &叫％ )。 為了使列印的效率更加完善，本發明提供第二個實施例，用以 解決延遲時間所造成的問題。請參考第5圖，帛5圖為本發明 之第二個實施例之電路圖。該電路為利用與第i圖相同數目的6 條位址線（A1〜A6)，利用兩條位址線解碼出15個致動訊號 (C1〜C15)，搭配3條圖元選擇線（psi〜pS3)來控制滴墨產生 單元5卜第5圖中致動訊號依序為c1(A2，a1)、C2 (a3，ai)、 C3· (A4，A1)、C4· (A5，A1)、C5· (A1，A6)、C6· (A2，A6)、C7. (A3，A6)、C8· ( A4，A6) ' C9. ( A6，A5)、CIO· ( A2，A5)、Cll. (A3，A5 )、C12. ( A5，A4)、C13. ( A2，A4)、C14. ( A4，A3 )、C15· (A3, A2)’在上列表中括號右側之位址線連接M〇s電晶體之閘 極（Gate )’括號左侧之位址線連接m〇s電晶體之及極（Drain)。 印表機系統運作時會循序地致能致動訊號C1〜C15，此時若圖元 選擇線PS 1〜PS3上傳送的訊號為High時，表示其對應之滴墨產 生單元滴墨（Firing)。在電路設計上請注意C5· (A1，A6)的設 計，第二個實施例中改變原先致動訊號C5· (A6，A1)的設計， 而將位址線A1連接到電晶體的汲極，A6連接到電晶體的閘極。 0338-A20734TWF(N2)；08-930056；brent 1250088 當致動《 C5㈣能週期結束後，A1直接⑽，而a6持續為 ON亚繼續與位址線A2〜A5致能致動訊號C6〜c9。同樣的情形 也發生在 C9· (A6，A5)、C12_ (A5，A4)、CM. (a4,a3)、ci5 (A3，A2)。1250088 IX. Description of the invention: [Technical field of the invention] The present invention is an inkjet head driving method and circuit, and the inkjet head outputs a plurality of first selection signals and a plurality of signals according to an inkjet printing system. The second selection signal 'prints a medium. [Prior Art] I1 is now booming in personal computers, printers have become a common device, and inkjet printers have entered the general consumer family with their low price and rich colors, so each manufacturer Improving the print quality of its products has published many new printing technologies, and one of the techniques to increase the print quality of the ink droplet generator controlled by the ink jet head is one of them. It is conventionally known that the number of print heads controlling the number of ink drop generating units is often limited by the number of address lines and primitive select lines, and the address lines and maps. The number of element selection lines is again limited by the wheel/input pins (I/O pins, hereinafter referred to as " ο) of the ink jet head and the printer. Please refer to Fig. 1 and Fig. 1 is a circuit diagram of a conventional control ink drop generating unit in the ink jet head. Taking this circuit diagram as an example, the circuit diagram is composed of six address lines (A1 to A6) and three picture selection lines CPS1 to PS3), and can control 18 ink drop generating units π. If, in the conventional manner, the drip generating unit 想要 that wants to increase the control has to increase the number of address lines and primitive selection lines, the number of I/Os to which the ink jet head is connected to the printer is also bound to increase substantially. Although today's process technology advances, the number of address lines and primitive selection lines can be increased, but too many I/O numbers may cause unpredictable conditions for system control or firmware writing, and I/O. The increase in the number also causes the address of the inkjet head to be connected to the printer system 0338-A20734TWF(N2); 08-930056; the connection of the brent 5 125〇〇88 line and the primitive selection line increases, which also makes the contact poor. The situation is more prone to 'and the trouble of connecting too many contacts. Therefore, how to control the most dripping ink generating unit in a limited address line and primitive selection line is an important motive of the present invention. Eye Mai Khao 2. The second figure is a circuit diagram of the US Pat. NO. 6176569 patent. The patent uses the concept of a block to divide all the ink-generating cells into two blocks, and then use two additional block lines (Bank Hne), block line 1 and block line 2 to Control so that more drip-generating units can be controlled with the same number of address lines. The implementation of this patent is to connect a MOS switch in series on the address line, and the gates of all the MOS switches connected in series in the same block connected to the ink drop generating unit are controlled by the same block line. In addition to the original address line and the primitive selection line, each drop ink generating unit must be matched with the switch input of the block line to input the signal of the address line to the gate of the power M0S, so that the ink drops. The unit is dripped (% of phlegm). With this method, it is only necessary to increase the number of block lines to increase the number of drip generation units controlled by the ink jet head by a multiple. However, although the above patent can increase the number of ink drop generating units controlled by the ink jet head, the main method of increasing the external circuit is not only an increase in the number of 1/〇, but also a complicated system control. If any of the block line faults are damaged, the drip-generating unit of the entire block will be unusable, and the manufacturer will also bear a higher risk in manufacturing. The present invention therefore provides a method and circuit for controlling a greater number of drip-generating units 以 with existing address lines without increasing the number of ι/〇. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for controlling a greater number of ink drop generating units with the existing 0338-A20734TWF (N2); 08~930056; brent 6 1250088 address lines without increasing the number of 1/〇. Method and circuit. According to the gist of the present invention, a (4)-one-Yang ink-printing system is input, and a plurality of second selection signals are printed on a medium. The method includes: a plurality of first driving lines, and the first selection of the plurality of control units are respectively connected, and the plurality of control signal groups are respectively connected to generate a complex 2-axis signal; wherein each of the controls The signal group includes a plurality of different selection signals of the brothers; a plurality of second driving lines are connected to the actuation signals; and the media is selectively printed by the control of the video. According to another aspect of the present invention, the present invention also provides an advanced driving method for ink drop generation in an ink jet head to increase the number of control of the ink drop generating unit, which is output by the head «- inkjet printer system Printing a medium by a plurality of first selection signals and a second selection signal, the inkjet head comprising a plurality of driving lines, a plurality of second driving lines, and a plurality of low ink generating units, the method The method includes the following steps: applying the first selection signals to the corresponding first driving lines for the plurality of control signal groups to generate a plurality of (four) (four), wherein, the parent control signals group includes a plurality of different control signals Waiting for the second selection signal 丨 and applying the actuation signals to the second driving lines, so that the ink droplet generating units should wait for the control of the first selection signal and the actuation signals, selectively to 5 hai The media prints. The above described objects, features, and advantages of the present invention will become more apparent from the aspects of the invention. Figure 3. Figure 3 is a circuit diagram of a first embodiment of the present invention. 0338-A20734TWF(N2);08-930056;brent, 1250088 This circuit is utilized and the first! The same number of 6 address lines (A1~A6) are used to decode 15 actuation signals (C1~ci5) using two address lines, and then controlled with 3 primitive remote selection lines (PS1~PS3). The ink drop generating unit increases the number of drip generating units controllable after applying the present invention to 45, which is more than the number of controllable ink generating units in the circuit of Fig. i. In Figure 3, the actuation signals are sequentially ci. (A2, A1), C2· (A3, A1), C3. (A4, A1), C4_ (A5, A1), c5· (A6, A1), C6 · (A3, A2), C7· (A4, A2), C8. (A5, A2), c9. (A6, A2), CIO· (A4, A3), Cll. (A5, A3), C12· ( A6, A3), C13. (A5, A4) C14· (A6, A4), C15. (A6, A5), connect the gate of the MOS transistor (Gate) to the address line on the right side of the parentheses in the above list, brackets The address line on the left side is connected to the drain of the MOS transistor. When the printer system is in operation, the signals C1 to C15 are sequentially activated. If the signal transmitted on the primitive selection lines PS1 to pS3 is High, it indicates that the corresponding ink generation unit has a Firing. The droplets are produced in the 31(5) column. When the address and the lines A1 and A2 are enabled to enable the actuation signal ci, when the primitive selection line PS1 is also enabled, the ink generation unit η drops ink (Firing). ). In order to more clearly indicate the above signal action, please refer to Figure 4. Fig. 4 is a signal waveform diagram for driving the ink-jet head circuit of Fig. 3, A1~A6 are signal signals of the address line, and psi~ps^ is the signal of the picture selection line. When the address line A1 is enabled, the address lines A2 to A6 are sequentially enabled, and the enabled time is the uniform energy period κ. In the enabling period of (A2, A1) (ie, the enabling period of the actuation signal C1), the By and PS3 signal lines are Hlgh, at which time the actuation signals C1. (A2, A1) and ρ§ι and PS3 are actuated. The connected dripping generating unit drops ink. Continue to the fourth item, after the end of the activation period of the actuation signal C5. (A6, A1), to the actuation signal c6 (the illusion will be generated - the delay time. This is because the inkjet head control unit needs to first (4) The drain (10) connected to the address line A6 is dropped, and then the address line M is _, which is 0338-A20734TWF(N2); 08-930056; brent 1250088 Avoid when (A6, A1) 〇 FF at the same time :: The error occurs when the two objects are "P. The same situation a 6, A3) ' C14 · (A6, A4) C15. (A6, A5) ^ Γ Γ Γ difficult (10), the address of the epoch transistor _ green OFF. From the beginning of the enabling period of c 1 Γ Λ 9 a η , · (,) until C15. Printing, the address line A5 is (10) off, such a time is called - a printer system in the column This printing is repeated at the time of printing to the end of the printing job. 'Direct library: t can be seen in the example, in this embodiment - a printing cycle, and 5 activation cycles plus 5 delay times ^ & called %). In order to make the printing efficiency more perfect, the present invention provides a second embodiment to solve the problem caused by the delay time. Please refer to Figure 5, Figure 5 Invention A circuit diagram of the second embodiment, which uses the same number of six address lines (A1 to A6) as in the i-th diagram, and decodes 15 actuation signals (C1 to C15) by using two address lines. With 3 primitive selection lines (psi~pS3) to control the ink drop generation unit 5, the actuation signals in Fig. 5 are sequentially c1(A2, a1), C2 (a3, ai), C3· (A4, A1). ), C4· (A5, A1), C5· (A1, A6), C6· (A2, A6), C7. (A3, A6), C8· (A4, A6) ' C9. ( A6, A5), CIO· (A2, A5), Cll. (A3, A5), C12. (A5, A4), C13. (A2, A4), C14. (A4, A3), C15· (A3, A2)' The address line on the right side of the parentheses in the list is connected to the gate of the M〇s transistor (Gate). The address line on the left side of the bracket is connected to the Drain of the m〇s transistor. The printer system operates sequentially. The actuation signals C1 to C15 are enabled. At this time, if the signal transmitted on the primitive selection lines PS 1 to PS3 is High, it indicates that the corresponding ink generation unit is in the ink (Firing). Please pay attention to the circuit design C5· (A1, A6) design, in the second embodiment, the design of the original actuation signal C5·(A6, A1) is changed, and the address is A1 is connected to the drain of the transistor, and A6 is connected to the gate of the transistor. 0338-A20734TWF(N2); 08-930056;brent 1250088 When the "C5(4) energy cycle is activated, A1 is directly (10), and a6 is continuously ON. The subcontinuation and address lines A2 to A5 enable the actuation of signals C6 to c9. The same happens in C9· (A6, A5), C12_ (A5, A4), CM. (a4, a3), ci5 (A3, A2).
為了更清楚表示上述訊號動作，請參考第6圖。第6圖為 驅動第5圖喷墨頭電路的訊號波形圖，A1~A6為位址線之訊號， PS1〜PS3為圖元選擇線之訊號。當位址線ai致能時，位址綠 A2〜A5循序地被致能。在（A2川的致能週期（亦即致動詔 號Ci的致能週期）中，PS1和ps3訊號線為咖，此時致動 訊號CUA2，A1)與PS1和PS3連接之滴墨產生單元便會滴黑。 繼續第6目’在致動訊號C5 (A1，A6)的致能週期結束後，位 址線Ai被0FF，A6持續為⑽，並與位址線a2〜a5致能致動 訊號C6〜C9。由訊號波形圖可以發現，因為改變料致動來號 C5. (A6川的設計，使得致動訊號C5岐能週期結束後，: 址線Ai被0FF而位址線A6則為⑽，如此便可藉由改變位址 線的排列方式而達到消除時間延遲的問題，使得每 時間變短（ΓΡ=157；)，提高列印效率。 j丨週JIn order to more clearly indicate the above signal action, please refer to Figure 6. Fig. 6 is a signal waveform diagram for driving the ink-jet head circuit of Fig. 5, A1~A6 are signals of the address line, and PS1~PS3 are signals of the picture selection line. When the address line ai is enabled, the address greens A2 to A5 are sequentially enabled. In the enabling period of A2chuan (that is, the enabling period of the actuation nick Ci), the PS1 and ps3 signal lines are coffee, and the actuation signal CUA2, A1) is connected to the ink generation unit of PS1 and PS3. It will drop black. Continue to the sixth item 'After the end of the enabling period of the actuation signal C5 (A1, A6), the address line Ai is 0FF, A6 continues to be (10), and the enabling signal C6~C9 is enabled with the address lines a2~a5. . It can be found from the signal waveform diagram that because the material change is activated by the number C5. (A6 Chuan design, after the end of the actuation signal C5, the address line Ai is 0FF and the address line A6 is (10), so The problem of eliminating the time delay can be achieved by changing the arrangement of the address lines, so that the time becomes shorter (ΓΡ=157;), and the printing efficiency is improved.
第7圖為應用本發明之—印表機系統架構圖。其中控制軍 元71在接收到列印資料後，將列印㈣轉換成符合印錢 的格式後，透過資料線傳送給喷墨頭驅動單元Μ。此❹ 驅動單元72依據控制單元71傳送之騎資料，將其轉換㈣、 兀選擇讯號和位址訊號，分別傳送至喷 " 飧，如r生丨丨清里-石τα u ΛΑ + 土貝/3上相對應之驅動 線&制贺墨頭73上的滴墨產生單元，使其產生列印 由上述實施例可以得知，本發明具有下列優點： 。 1_可在相同的位址線數目下控制更多的滴墨產 2.節省喷墨頭與印表機系統端的I/Q接點數。 凡。 0338-A20734TWF(N2)；08-930056；brent 10 1250088 雖然本發明已以具體實施例揭露如上，然其僅為了易於說 明本發明之技術内容，而並非將本發明狹義地限定於該實施 例，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。 0338-A20734TWF(N2)；08-930056；brent 11 l25〇〇88 [圖式簡單說明】 :1圖為一習知嘖墨頭内控制滴墨產生單元的電路圖 固為Pat，N〇· 6i76569專利的一電路架構圖。 第3圖為本發明之第一個實施例的電路圖。 =4圖為驅動第3圖喷墨頭電路的訊號波形圖。 第5圖為本發明之第二個實施例之電路圖。 =6圖為驅動第5圖喷墨頭電路的訊號波形圖。 第7圖為應用本發明之一印表機系統架構圖。 【主要元件符號說明】 11、31、51〜滴墨產生單元； 71〜主控單元； 72〜喷墨頭驅動單元； 73〜喷墨頭。 0338-A20734TWF(N2)；08-930056；brent 12Figure 7 is a diagram showing the architecture of the printer system to which the present invention is applied. After receiving the printed data, the control unit 71 converts the printing (4) into a format suitable for printing money, and then transmits the data to the inkjet head driving unit through the data line. The ❹ driving unit 72 converts the (4), 兀 selection signal and address signal to the spray according to the riding data transmitted by the control unit 71, respectively, such as r 丨丨 丨丨 里 - 石 τ α u ΛΑ + 土贝The ink drop generating unit on the corresponding driving line & the ink head 73 is printed to make it printable. From the above embodiment, the present invention has the following advantages: 1_ can control more drops of ink under the same number of address lines. 2. Save the number of I/Q contacts on the system side of the inkjet head and the printer. Where. 0338-A20734TWF(N2); 08-930056;brent 10 1250088 Although the present invention has been disclosed above in the specific embodiments, it is merely for ease of description of the technical contents of the present invention, and the present invention is not limited to the embodiment. Any person skilled in the art will be able to make some modifications and refinements without departing from the spirit and scope of the invention, and the scope of the invention is defined by the scope of the appended claims. 0338-A20734TWF(N2);08-930056;brent 11 l25〇〇88 [Simple description of the diagram]: 1 is a circuit diagram of the control drip ink generating unit in the ink head. It is a Pat, N〇·6i76569 patent. A circuit architecture diagram. Figure 3 is a circuit diagram of a first embodiment of the present invention. The =4 picture is a signal waveform diagram for driving the ink jet head circuit of Fig. 3. Figure 5 is a circuit diagram of a second embodiment of the present invention. Fig. 6 is a signal waveform diagram for driving the ink jet head circuit of Fig. 5. Figure 7 is a diagram showing the architecture of a printer system to which the present invention is applied. [Main component symbol description] 11, 31, 51 ~ ink drop generating unit; 71 ~ main control unit; 72 ~ ink jet head driving unit; 73 ~ ink jet head. 0338-A20734TWF(N2);08-930056;brent 12