Abstract:
A printhead that has at least one printhead integrated circuit (IC) with an array of nozzles for ejecting ink and a support structure for supporting the printhead IC. The support structure has an ink conduit for supplying the array of nozzles with ink. The conduit has a set of resonant frequencies at which ink in the conduit generates a standing wave in response to certain operating modes of the array of nozzle. A fluidic damper is incorporated into printhead, the damper having a selected resonant frequency that damps the standing waves associated with each of the set of resonant frequencies such that they have an amplitude less than a maximum threshold.

Description:
FIELD OF THE INVENTION 
     The present invention relates to the field of inkjet printing and in particular, inkjet printers with pagewidth printheads. 
     CO-PENDING APPLICATIONS 
     The following applications have been filed by the Applicant simultaneously with the present application: 
     
       
         
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 12/014,767 
                 12/014,769 
                 7,832,838 
                 7,862,162 
                 7,758,149 
                 12/014,773 
               
               
                 7,758,152 
                 12/014,775 
                 7,753,477 
                 12/014,777 
                 12/014,778 
                 12/014,779 
               
               
                 12/014,780 
                 7,891,763 
                 7,815,282 
                 12/014,783 
                 7,832,834 
                 12/014,785 
               
               
                 12/014,787 
                 7,753,478 
                 12/014,789 
                 7,845,778 
                 12/014,791 
                 7,771,002 
               
               
                 12/014,793 
                 7,766,451 
                 7,771,007 
                 7,819,500 
                 12/014,801 
                 12/014,803 
               
               
                 7,857,438 
                 12/014,805 
                 12/014,806 
                 12/014,807 
               
               
                   
               
             
          
         
       
     
     The disclosures of these co-pending applications are incorporated herein by reference. 
     CROSS REFERENCES 
     The following patents or patent applications filed by the applicant or assignee of the present invention are hereby incorporated by cross-reference. 
     
       
         
               
               
               
               
               
               
               
             
           
               
                   
               
             
             
               
                 6,276,850 
                 6,520,631 
                 6,158,907 
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                 7,161,715 
               
               
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                 6,241,905 
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                 6,306,671 
               
               
                 6,331,258 
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                 6,294,101 
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                 6,855,264 
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                 6,228,668 
               
               
                 6,180,427 
                 6,171,875 
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                 6,526,658 
               
               
                 7,210,767 
                 11/056,146 
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                 7,092,125 
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                 6,877,834 
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                 10/636,230 
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                 7,079,286 
               
               
                 7,064,867 
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                 11/640,267 
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                 11/863,239 
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                 10/913,372 
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                 11/454,899 
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                 11/831,963 
               
               
                 60,951,700 
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                 10/683,041 
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                 10/922,884 
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                 10/922,880 
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                 10/922,872 
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                 10/922,886 
                 10/922,877 
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                 11/841,647 
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                 11/293,832 
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                 11/293,798 
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                 11/124,154 
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                 11/124,163 
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                 11/124,155 
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                 11/187,976 
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                 11/228,540 
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                 11/228,533 
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                 11/228,529 
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                 11/228,506 
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                 11/228,519 
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                 11/228,522 
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                 11/228,492 
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                 11/228,495 
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                 11/228,517 
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                 11/228,480 
                 11/228,535 
                 11/228,478 
               
               
                 11/228,479 
                 6,238,115 
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                 6,805,049 
               
               
                 6,971,313 
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                 7,024,995 
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                 6,926,455 
                 7,056,038 
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                 6,981,809 
               
               
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                 11/737,726 
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                 6,938,990 
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                 7,152,972 
                 11/592,996 
                 D529952 
                 6,390,605 
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                 6,305,788 
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                 7,040,736 
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                 11/450,431 
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                 11/604,315 
               
               
                 11/604,323 
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                 11/935,389 
                 11/869,670 
                 7,095,309 
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                 6,854,825 
               
               
                 6,623,106 
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                 6,428,139 
               
               
                 6,575,549 
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                 6,746,105 
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                 6,412,904 
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                 6,793,323 
               
               
                 6,659,590 
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                 6,978,613 
               
               
                 6,439,693 
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                 6,863,369 
                 6,428,142 
                 6,874,868 
                 6,390,591 
               
               
                 6,799,828 
                 6,896,358 
                 7,018,016 
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                 6,382,779 
               
               
                 6,629,745 
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                 6,609,786 
                 6,609,787 
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                 6,764,166 
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                 10/510,092 
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                 6,820,968 
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                 7,303,262 
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                 6,682,176 
               
               
                 6,998,062 
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                 6,755,509 
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                 10/534,811 
               
               
                 6,672,709 
                 7,303,263 
                 7,086,718 
                 10/534,881 
                 6,672,710 
                 10/534,812 
                 6,669,334 
               
               
                 10/534,804 
                 7,152,958 
                 7,281,782 
                 6,824,246 
                 7,264,336 
                 6,669,333 
                 10/534,815 
               
               
                 6,820,967 
                 7,306,326 
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                 7,264,335 
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                 7,222,943 
                 7,188,419 
               
               
                 7,168,166 
                 6,974,209 
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                 7,195,338 
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                 7,101,025 
               
               
                 11/474,281 
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                 11/772,239 
               
               
                 11/782,598 
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                 11/955,028 
               
               
                 11/763,440 
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                 11/246,691 
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                 11/246,701 
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                 11/246,699 
                 11/246,675 
               
               
                 11/246,674 
                 11/246,667 
                 11/829,957 
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                 11/829,966 
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                 11/829,968 
                 11/829,969 
                 11/946,839 
                 11/946,838 
                 11/946,837 
               
               
                 11/951,230 
                 7,156,508 
                 7,159,972 
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                 7,090,336 
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                 7,255,423 
               
               
                 7,219,980 
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                 7,077,505 
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                 10/760,231 
               
               
                 7,152,959 
                 7,213,906 
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                 7,222,938 
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                 11/446,227 
               
               
                 11/454,904 
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                 11/482,950 
               
               
                 11/499,709 
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                 11/653,253 
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                 11/778,566 
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                 11/954,906 
               
               
                 11/954,949 
                 11/967,226 
                 7,303,930 
                 11/246,672 
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                 11/246,683 
                 11/246,682 
               
               
                 60/939,086 
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                 11/860,539 
                 11/860,540 
                 11/860,541 
                 11/860,542 
                 11/936,060 
               
               
                 11/877,667 
                 11/877,668 
                 7,246,886 
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                 7,108,355 
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                 7,287,836 
               
               
                 7,118,197 
                 10/728,784 
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                 10/728,803 
                 7,147,308 
               
               
                 10/728,779 
                 7,118,198 
                 7,168,790 
                 7,172,270 
                 7,229,155 
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                 7,195,342 
               
               
                 7,175,261 
                 10/773,183 
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                 10/773,186 
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                 10/773,185 
               
               
                 7,134,743 
                 7,182,439 
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                 10/773,187 
                 7,134,745 
                 7,156,484 
                 7,118,201 
               
               
                 7,111,926 
                 10/773,184 
                 7,018,021 
                 11/060,751 
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                 7,128,402 
               
               
                 11/298,774 
                 11/329,157 
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                 7,229,156 
               
               
                 11/505,846 
                 11/505,857 
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                 11/524,908 
                 11/524,938 
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                 11/524,912 
               
               
                 7,278,716 
                 11/592,995 
                 11/603,825 
                 11/649,773 
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                 11/706,378 
               
               
                 11/706,962 
                 11/749,118 
                 11/754,937 
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                 11/744,885 
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                 11/765,439 
               
               
                 11/842,950 
                 11/839,539 
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                 11/097,299 
               
               
                 11/097,310 
                 11/097,213 
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                 11/764,806 
               
               
                 11/782,595 
                 11/965,696 
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                 11/756,624 
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                 11/756,627 
                 11/756,628 
                 11/756,629 
                 11/756,630 
               
               
                 11/756,631 
                 7,156,289 
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                 11/084,742 
               
               
                 11/084,806 
                 09/575,197 
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                 7,079,712 
                 7,079,712 
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                 6,825,945 
               
               
                 09/575,165 
                 09/575,165 
                 6,813,039 
                 6,813,039 
                 7,190,474 
                 7,190,474 
                 6,987,506 
               
               
                 6,987,506 
                 6,824,044 
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                 7,038,797 
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                 6,980,318 
                 6,980,318 
               
               
                 6,816,274 
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                 09/575,186 
                 09/575,186 
                 6,681,045 
               
               
                 6,681,045 
                 6,678,499 
                 6,678,499 
                 6,679,420 
                 6,679,420 
                 6,963,845 
                 6,963,845 
               
               
                 6,976,220 
                 6,976,220 
                 6,728,000 
                 6,728,000 
                 7,110,126 
                 7,110,126 
                 7,173,722 
               
               
                 7,173,722 
                 6,976,035 
                 6,976,035 
                 6,813,558 
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                 6,766,942 
                 6,766,942 
               
               
                 6,965,454 
                 6,965,454 
                 6,995,859 
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                 6,720,985 
               
               
                 6,720,985 
                 7,286,113 
                 7,286,113 
                 6,922,779 
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                 6,978,019 
                 6,978,019 
               
               
                 6,847,883 
                 6,847,883 
                 7,131,058 
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                 7,295,839 
                 7,295,839 
                 09/607,843 
               
               
                 09/607,843 
                 09/693,690 
                 09/693,690 
                 6,959,298 
                 6,959,298 
                 6,973,450 
                 6,973,450 
               
               
                 7,150,404 
                 7,150,404 
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                 09/575,181 
               
               
                 09/575,181 
                 09/722,174 
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                 7,175,079 
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                 7,162,259 
                 6,718,061 
               
               
                 10/291,523 
                 10/291,471 
                 7,012,710 
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                 10/291,481 
                 7,222,098 
                 10/291,825 
               
               
                 7,263,508 
                 7,031,010 
                 6,972,864 
                 6,862,105 
                 7,009,738 
                 6,989,911 
                 6,982,807 
               
               
                 10/291,576 
                 6,829,387 
                 6,714,678 
                 6,644,545 
                 6,609,653 
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                 10/291,555 
               
               
                 7,293,240 
                 10/291,592 
                 10/291,542 
                 7,044,363 
                 7,004,390 
                 6,867,880 
                 7,034,953 
               
               
                 6,987,581 
                 7,216,224 
                 10/291,821 
                 7,162,269 
                 7,162,222 
                 7,290,210 
                 7,293,233 
               
               
                 7,293,234 
                 6,850,931 
                 6,865,570 
                 6,847,961 
                 10/685,523 
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                 7,162,442 
               
               
                 10/685,584 
                 7,159,784 
                 10/804,034 
                 10/793,933 
                 6,889,896 
                 10/831,232 
                 7,174,056 
               
               
                 6,996,274 
                 7,162,088 
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                 10/944,044 
                 7,259,884 
                 10/944,043 
               
               
                 7,167,270 
                 10/943,877 
                 6,986,459 
                 10/954,170 
                 7,181,448 
                 10/981,626 
                 10/981,616 
               
               
                 10/981,627 
                 7,231,293 
                 7,174,329 
                 10/992,713 
                 7,295,922 
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                 7,124,643 
                 7,121,145 
                 7,089,790 
               
               
                 7,194,901 
                 6,968,744 
                 7,089,798 
                 7,240,560 
                 7,137,302 
                 11/442,177 
                 7,171,855 
               
               
                 7,260,995 
                 7,260,993 
                 7,165,460 
                 7,222,538 
                 7,258,019 
                 11/543,047 
                 7,258,020 
               
               
                 11/604,324 
                 11/642,520 
                 11/706,305 
                 11/707,056 
                 11/744,211 
                 11/767,526 
                 11/779,846 
               
               
                 11/764,227 
                 11/829,943 
                 11/829,944 
                 6,454,482 
                 6,454,482 
                 6,808,330 
                 6,808,330 
               
               
                 6,527,365 
                 6,527,365 
                 6,474,773 
                 6,474,773 
                 6,550,997 
                 6,550,997 
                 7,093,923 
               
               
                 6,957,923 
                 7,131,724 
                 10/949,288 
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                 7,125,098 
                 11/706,966 
                 11/185,722 
               
               
                 7,249,901 
                 7,188,930 
                 11/014,728 
                 11/014,727 
                 D53603I 
                 D531214 
                 7,237,888 
               
               
                 7,168,654 
                 7,201,272 
                 6,991,098 
                 7,217,051 
                 6,944,970 
                 10/760,215 
                 7,108,434 
               
               
                 10/760,257 
                 7,210,407 
                 7,186,042 
                 10/760,266 
                 6,920,704 
                 7,217,049 
                 10/760,214 
               
               
                 10/760,260 
                 7,147,102 
                 7,287,828 
                 7,249,838 
                 10/760,241 
                 10/962,413 
                 10/962,427 
               
               
                 7,261,477 
                 7,225,739 
                 10/962,402 
                 10/962,425 
                 10/962,428 
                 7,191,978 
                 10/962,426 
               
               
                 10/962,409 
                 10/962,417 
                 10/962,403 
                 7,163,287 
                 7,258,415 
                 10/962,523 
                 7,258,424 
               
               
                 10/962,410 
                 7,195,412 
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                 7,220,072 
                 11/474,267 
                 11/544,547 
               
               
                 11/585,925 
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                 11/706,298 
                 11/706,296 
                 11/706,327 
                 11/730,760 
                 11/730,407 
               
               
                 11/730,787 
                 11/735,977 
                 11/736,527 
                 11/753,566 
                 11/754,359 
                 11/778,061 
                 11/765,398 
               
               
                 11/778,556 
                 11/829,937 
                 11/780,470 
                 11/866,399 
                 11/223,262 
                 11/223,018 
                 11/223,114 
               
               
                 11/955,366 
                 11/223,022 
                 11/223,021 
                 11/223,020 
                 11/223,019 
                 11/014,730 
                 D541849 
               
               
                 29/279,123 
                 6,716,666 
                 6,949,217 
                 6,750,083 
                 7,014,451 
                 6,777,259 
                 6,923,524 
               
               
                 6,557,978 
                 6,991,207 
                 6,766,998 
                 6,967,354 
                 6,759,723 
                 6,870,259 
                 10/853,270 
               
               
                 6,925,875 
                 10/898,214 
                 7,095,109 
                 7,145,696 
                 10/976,081 
                 7,193,482 
                 7,134,739 
               
               
                 7,222,939 
                 7,164,501 
                 7,118,186 
                 7,201,523 
                 7,226,159 
                 7,249,839 
                 7,108,343 
               
               
                 7,154,626 
                 7,079,292 
                 10/980,184 
                 7,233,421 
                 7,063,408 
                 10/983,082 
                 10/982,804 
               
               
                 7,032,996 
                 10/982,834 
                 10/982,833 
                 10/982,817 
                 7,217,046 
                 6,948,870 
                 7,195,336 
               
               
                 7,070,257 
                 10/986,813 
                 10/986,785 
                 7,093,922 
                 6,988,789 
                 10/986,788 
                 7,246,871 
               
               
                 10/992,748 
                 10/992,747 
                 7,187,468 
                 10/992,828 
                 7,196,814 
                 10/992,754 
                 7,268,911 
               
               
                 7,265,869 
                 7,128,384 
                 7,164,505 
                 7,284,805 
                 7,025,434 
                 7,298,519 
                 7,280,244 
               
               
                 7,206,098 
                 7,265,877 
                 7,193,743 
                 7,168,777 
                 11/006,734 
                 7,195,329 
                 7,198,346 
               
               
                 7,281,786 
                 11/013,363 
                 11/013,881 
                 6,959,983 
                 7,128,386 
                 7,097,104 
                 11/013,636 
               
               
                 7,083,261 
                 7,070,258 
                 7,083,275 
                 7,110,139 
                 6,994,419 
                 6,935,725 
                 11/026,046 
               
               
                 7,178,892 
                 7,219,429 
                 6,988,784 
                 11/026,135 
                 7,289,156 
                 11/064,005 
                 7,284,976 
               
               
                 7,178,903 
                 7,273,274 
                 7,083,256 
                 11/064,008 
                 7,278,707 
                 11/064,013 
                 6,974,206 
               
               
                 11/064,004 
                 7,066,588 
                 7,222,940 
                 11/075,918 
                 7,018,025 
                 7,221,867 
                 7,290,863 
               
               
                 7,188,938 
                 7,021,742 
                 7,083,262 
                 7,192,119 
                 11/083,021 
                 7,036,912 
                 7,175,256 
               
               
                 7,182,441 
                 7,083,258 
                 7,114,796 
                 7,147,302 
                 11/084,757 
                 7,219,982 
                 7,118,195 
               
               
                 7,229,153 
                 6,991,318 
                 7,108,346 
                 11/248,429 
                 11/239,031 
                 7,178,899 
                 7,066,579 
               
               
                 11/281,419 
                 11/298,633 
                 11/329,188 
                 11/329,140 
                 7,270,397 
                 7,258,425 
                 7,237,874 
               
               
                 7,152,961 
                 11/478,592 
                 7,207,658 
                 11/484,744 
                 7,311,257 
                 7,207,659 
                 11/525,857 
               
               
                 11/540,569 
                 11/583,869 
                 11/592,985 
                 11/585,947 
                 7,306,307 
                 11/604,316 
                 11/604,309 
               
               
                 11/604,303 
                 11/643,844 
                 11/650,553 
                 11/655,940 
                 11/653,320 
                 7,278,713 
                 11/706,381 
               
               
                 11/706,323 
                 11/706,963 
                 11/713,660 
                 7,290,853 
                 11/696,186 
                 11/730,390 
                 11/737,139 
               
               
                 11/737,749 
                 11/740,273 
                 11/749,122 
                 11/754,361 
                 11/766,043 
                 11/764,775 
                 11/768,872 
               
               
                 11/775,156 
                 11/779,271 
                 11/779,272 
                 11/829,938 
                 11/839,502 
                 11/858,852 
                 11/862,188 
               
               
                 11/859,790 
                 11/872,618 
                 11/923,651 
                 11/950,255 
                 11/930,001 
                 11/955,362 
                 11/965,718 
               
               
                 6,485,123 
                 6,425,657 
                 6,488,358 
                 7,021,746 
                 6,712,986 
                 6,981,757 
                 6,505,912 
               
               
                 6,439,694 
                 6,364,461 
                 6,378,990 
                 6,425,658 
                 6,488,361 
                 6,814,429 
                 6,471,336 
               
               
                 6,457,813 
                 6,540,331 
                 6,454,396 
                 6,464,325 
                 6,443,559 
                 6,435,664 
                 6,412,914 
               
               
                 6,488,360 
                 6,550,896 
                 6,439,695 
                 6,447,100 
                 09/900,160 
                 6,488,359 
                 6,637,873 
               
               
                 10/485,738 
                 6,618,117 
                 10/485,737 
                 6,803,989 
                 7,234,801 
                 7,044,589 
                 7,163,273 
               
               
                 6,416,154 
                 6,547,364 
                 10/485,744 
                 6,644,771 
                 7,152,939 
                 6,565,181 
                 10/485,805 
               
               
                 6,857,719 
                 7,255,414 
                 6,702,417 
                 7,284,843 
                 6,918,654 
                 7,070,265 
                 6,616,271 
               
               
                 6,652,078 
                 6,503,408 
                 6,607,263 
                 7,111,924 
                 6,623,108 
                 6,698,867 
                 6,488,362 
               
               
                 6,625,874 
                 6,921,153 
                 7,198,356 
                 6,536,874 
                 6,425,651 
                 6,435,667 
                 10/509,997 
               
               
                 6,527,374 
                 10/510,154 
                 6,582,059 
                 10/510,152 
                 6,513,908 
                 7,246,883 
                 6,540,332 
               
               
                 6,547,368 
                 7,070,256 
                 6,508,546 
                 10/510,151 
                 6,679,584 
                 10/510,000 
                 6,857,724 
               
               
                 10/509,998 
                 6,652,052 
                 10/509,999 
                 6,672,706 
                 10/510,096 
                 6,688,719 
                 6,712,924 
               
               
                 6,588,886 
                 7,077,508 
                 7,207,654 
                 6,935,724 
                 6,927,786 
                 6,988,787 
                 6,899,415 
               
               
                 6,672,708 
                 6,644,767 
                 6,874,866 
                 6,830,316 
                 6,994,420 
                 6,954,254 
                 7,086,720 
               
               
                 7,240,992 
                 7,267,424 
                 7,128,397 
                 7,084,951 
                 7,156,496 
                 7,066,578 
                 7,101,023 
               
               
                 11/165,027 
                 11/202,235 
                 11/225,157 
                 7,159,965 
                 7,255,424 
                 11/349,519 
                 7,137,686 
               
               
                 7,201,472 
                 7,287,829 
                 11/504,602 
                 7,216,957 
                 11/520,572 
                 11/583,858 
                 11/583,895 
               
               
                 11/585,976 
                 11/635,488 
                 7,278,712 
                 11/706,952 
                 11/706,307 
                 7,287,827 
                 11/944,451 
               
               
                 11/740,287 
                 11/754,367 
                 11/758,643 
                 11/778,572 
                 11/859,791 
                 11/863,260 
                 11/874,178 
               
               
                 11/936,064 
                 11/951,983 
                 6,916,082 
                 6,786,570 
                 10/753,478 
                 6,848,780 
                 6,966,633 
               
               
                 7,179,395 
                 6,969,153 
                 6,979,075 
                 7,132,056 
                 6,832,828 
                 6,860,590 
                 6,905,620 
               
               
                 6,786,574 
                 6,824,252 
                 7,097,282 
                 6,997,545 
                 6,971,734 
                 6,918,652 
                 6,978,990 
               
               
                 6,863,105 
                 10/780,624 
                 7,194,629 
                 10/791,792 
                 6,890,059 
                 6,988,785 
                 6,830,315 
               
               
                 7,246,881 
                 7,125,102 
                 7,028,474 
                 7,066,575 
                 6,986,202 
                 7,044,584 
                 7,210,762 
               
               
                 7,032,992 
                 7,140,720 
                 7,207,656 
                 7,285,170 
                 11/048,748 
                 7,008,041 
                 7,011,390 
               
               
                 7,048,868 
                 7,014,785 
                 7,131,717 
                 7,284,826 
                 11/176,158 
                 7,182,436 
                 7,104,631 
               
               
                 7,240,993 
                 7,290,859 
                 11/202,217 
                 7,172,265 
                 7,284,837 
                 7,066,573 
                 11/298,635 
               
               
                 7,152,949 
                 11/442,161 
                 11/442,133 
                 11/442,126 
                 7,156,492 
                 11/478,588 
                 11/505,848 
               
               
                 7,287,834 
                 11/525,861 
                 11/583,939 
                 11/545,504 
                 7,284,326 
                 11/635,485 
                 11/730,391 
               
               
                 11/730,788 
                 11/749,148 
                 11/749,149 
                 11/749,152 
                 11/749,151 
                 11/759,886 
                 11/865,668 
               
               
                 11/874,168 
                 11/874,203 
                 11/971,182 
                 11/965,722 
                 6,824,257 
                 7,270,475 
                 6,971,811 
               
               
                 6,878,564 
                 6,921,145 
                 6,890,052 
                 7,021,747 
                 6,929,345 
                 6,811,242 
                 6,916,087 
               
               
                 6,905,195 
                 6,899,416 
                 6,883,906 
                 6,955,428 
                 7,284,834 
                 6,932,459 
                 6,962,410 
               
               
                 7,033,008 
                 6,962,409 
                 7,013,641 
                 7,204,580 
                 7,032,997 
                 6,998,278 
                 7,004,563 
               
               
                 6,910,755 
                 6,969,142 
                 6,938,994 
                 7,188,935 
                 10/959,049 
                 7,134,740 
                 6,997,537 
               
               
                 7,004,567 
                 6,916,091 
                 7,077,588 
                 6,918,707 
                 6,923,583 
                 6,953,295 
                 6,921,221 
               
               
                 7,001,008 
                 7,168,167 
                 7,210,759 
                 11/008,115 
                 11/011,120 
                 11/012,329 
                 6,988,790 
               
               
                 7,192,120 
                 7,168,789 
                 7,004,577 
                 7,052,120 
                 11/123,007 
                 6,994,426 
                 7,258,418 
               
               
                 7,014,298 
                 11/124,348 
                 11/177,394 
                 7,152,955 
                 7,097,292 
                 7,207,657 
                 7,152,944 
               
               
                 7,147,303 
                 11/209,712 
                 7,134,608 
                 7,264,333 
                 7,093,921 
                 7,077,590 
                 7,147,297 
               
               
                 11/239,029 
                 11/248,832 
                 11/248,428 
                 11/248,434 
                 7,077,507 
                 7,172,672 
                 7,175,776 
               
               
                 7,086,717 
                 7,101,020 
                 11/329,155 
                 7,201,466 
                 11/330,057 
                 7,152,967 
                 7,182,431 
               
               
                 7,210,666 
                 7,252,367 
                 7,287,837 
                 11/485,255 
                 11/525,860 
                 6,945,630 
                 7,018,294 
               
               
                 6,910,014 
                 6,659,447 
                 6,648,321 
                 7,082,980 
                 6,672,584 
                 7,073,551 
                 6,830,395 
               
               
                 7,289,727 
                 7,001,011 
                 6,880,922 
                 6,886,915 
                 6,644,787 
                 6,641,255 
                 7,066,580 
               
               
                 6,652,082 
                 7,284,833 
                 6,666,544 
                 6,666,543 
                 6,669,332 
                 6,984,023 
                 6,733,104 
               
               
                 6,644,793 
                 6,723,575 
                 6,953,235 
                 6,663,225 
                 7,076,872 
                 7,059,706 
                 7,185,971 
               
               
                 7,090,335 
                 6,854,827 
                 6,793,974 
                 10/636,258 
                 7,222,929 
                 6,739,701 
                 7,073,881 
               
               
                 7,155,823 
                 7,219,427 
                 7,008,503 
                 6,783,216 
                 6,883,890 
                 6,857,726 
                 10/636,274 
               
               
                 6,641,256 
                 6,808,253 
                 6,827,428 
                 6,802,587 
                 6,997,534 
                 6,959,982 
                 6,959,981 
               
               
                 6,886,917 
                 6,969,473 
                 6,827,425 
                 7,007,859 
                 6,802,594 
                 6,792,754 
                 6,860,107 
               
               
                 6,786,043 
                 6,863,378 
                 7,052,114 
                 7,001,007 
                 10/729,151 
                 10/729,157 
                 6,948,794 
               
               
                 6,805,435 
                 6,733,116 
                 10/683,006 
                 7,008,046 
                 6,880,918 
                 7,066,574 
                 6,983,595 
               
               
                 6,923,527 
                 7,275,800 
                 7,163,276 
                 7,156,495 
                 6,976,751 
                 6,994,430 
                 7,014,296 
               
               
                 7,059,704 
                 7,160,743 
                 7,175,775 
                 7,287,839 
                 7,097,283 
                 7,140,722 
                 11/123,009 
               
               
                 11/123,008 
                 7,080,893 
                 7,093,920 
                 7,270,492 
                 7,128,093 
                 7,052,113 
                 7,055,934 
               
               
                 11/155,627 
                 7,278,796 
                 11/159,197 
                 7,083,263 
                 7,145,592 
                 7,025,436 
                 11/281,444 
               
               
                 7,258,421 
                 11/478,591 
                 11/478,735 
                 7,226,147 
                 11/482,940 
                 7,195,339 
                 11/503,061 
               
               
                 11/505,938 
                 7,284,838 
                 7,293,856 
                 11/544,577 
                 11/540,576 
                 11/585,964 
                 11/592,991 
               
               
                 11/599,342 
                 11/600,803 
                 11/604,321 
                 11/604,302 
                 11/635,535 
                 11/635,486 
                 11/643,842 
               
               
                 11/655,987 
                 11/650,541 
                 11/706,301 
                 11/707,039 
                 11/730,388 
                 11/730,786 
                 11/730,785 
               
               
                 11/739,080 
                 11/764,746 
                 11/768,875 
                 11/779,847 
                 11/829,940 
                 11/847,240 
                 11/834,625 
               
               
                 11/863,210 
                 11/865,680 
                 11/874,156 
                 11/923,602 
                 11/951,940 
                 11/954,988 
                 11/961,662 
               
               
                 7,067,067 
                 6,776,476 
                 6,880,914 
                 7,086,709 
                 6,783,217 
                 7,147,791 
                 6,929,352 
               
               
                 7,144,095 
                 6,820,974 
                 6,918,647 
                 6,984,016 
                 7,192,125 
                 6,824,251 
                 6,834,939 
               
               
                 6,840,600 
                 6,786,573 
                 7,144,519 
                 6,799,835 
                 6,959,975 
                 6,959,974 
                 7,021,740 
               
               
                 6,935,718 
                 6,938,983 
                 6,938,991 
                 7,226,145 
                 7,140,719 
                 6,988,788 
                 7,022,250 
               
               
                 6,929,350 
                 7,011,393 
                 7,004,566 
                 7,175,097 
                 6,948,799 
                 7,143,944 
                 7,310,157 
               
               
                 7,029,100 
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                 7,073,724 
                 7,055,933 
                 7,077,490 
                 7,055,940 
                 10/991,402 
               
               
                 7,234,645 
                 7,032,999 
                 7,066,576 
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                 7,086,728 
                 7,246,879 
                 7,284,825 
               
               
                 7,140,718 
                 7,284,817 
                 7,144,098 
                 7,044,577 
                 7,284,824 
                 7,284,827 
                 7,189,334 
               
               
                 7,055,935 
                 7,152,860 
                 11/203,188 
                 11 203173 
                 11/202,343 
                 7,213,989 
                 11/225,156 
               
               
                 11/225,173 
                 7,300,141 
                 7,114,868 
                 7,168,796 
                 7,159,967 
                 11/272,425 
                 7,152,805 
               
               
                 11/298,530 
                 11/330,061 
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                 11/330,054 
                 11/329,284 
                 7,152,956 
                 7,128,399 
               
               
                 7,147,305 
                 7,287,702 
                 11/442,160 
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                 11/442,125 
                 11/454,901 
               
               
                 11/442,134 
                 11/450,441 
                 11/474,274 
                 11/499,741 
                 7,270,399 
                 6,857,728 
                 6,857,729 
               
               
                 6,857,730 
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                 6,982,189 
                 7,173,332 
                 7,026,176 
               
               
                 6,979,599 
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                 10/804,057 
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                 6,866,369 
               
               
                 6,946,743 
                 10/804,048 
                 6,886,918 
                 7,059,720 
                 7,306,305 
                 10/846,562 
                 10/846,647 
               
               
                 10/846,649 
                 10/846,627 
                 6,951,390 
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                 6,789,881 
                 6,802,592 
                 7,029,097 
               
               
                 6,799,836 
                 7,048,352 
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                 6,830,198 
               
               
                 6,992,791 
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                 7,101,034 
               
               
                 6,969,144 
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                 7,007,852 
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                 6,845,978 
               
               
                 6,848,687 
                 6,840,512 
                 6,863,365 
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                 7,128,396 
                 6,913,347 
               
               
                 7,008,819 
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                 6,991,317 
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                 7,093,928 
                 7,100,834 
               
               
                 7,270,396 
                 7,187,086 
                 7,290,856 
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                 7,086,721 
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                 7,010,456 
               
               
                 7,147,307 
                 7,111,925 
                 11/144,812 
                 7,229,154 
                 11/505,849 
                 11/520,570 
                 11/520,575 
               
               
                 11/546,437 
                 11/540,575 
                 11/583,937 
                 7,278,711 
                 7,290,720 
                 11/592,207 
                 11/635,489 
               
               
                 11/604,319 
                 11/635,490 
                 11/635,525 
                 7,287,706 
                 11/706,366 
                 11/706,310 
                 11/706,308 
               
               
                 11/785,108 
                 11/744,214 
                 11/744,218 
                 11/748,485 
                 11/748,490 
                 11/764,778 
                 11/766,025 
               
               
                 11/834,635 
                 11/839,541 
                 11/860,420 
                 11/865,693 
                 11/863,118 
                 11/866,307 
                 11/866,340 
               
               
                 11/869,684 
                 11/869,722 
                 11/869,694 
                 11/876,592 
                 11/945,244 
                 11/951,121 
                 11/945,238 
               
               
                 11/955,358 
                 11/965,710 
                 11/962,050 
               
               
                   
               
             
          
         
       
     
     BACKGROUND OF THE INVENTION 
     The Applicant has developed a wide range of printers that employ pagewidth printheads instead of traditional reciprocating printhead designs. Pagewidth designs increase print speeds as the printhead does not traverse back and forth across the page to deposit a line of an image. The pagewidth printhead simply deposits the ink on the media as it moves past at high speeds. Such printheads have made it possible to perform full colour 1600 dpi printing at speeds in the vicinity of 60 pages per minute; speeds previously unattainable with conventional inkjet printers. 
     Printing at these speeds consumes ink quickly and this gives rise to problems with supplying the printhead with enough ink. Not only are the flow rates higher but distributing the ink along the entire length of a pagewidth printhead is more complex than feeding ink to a relatively small reciprocating printhead. 
     The high print speeds require a large ink supply flow rate. This mass of ink is moving relatively quickly through the supply line. Abruptly ending a print job, or simply at the end of a printed page, means that this relatively high volume of ink that is flowing relatively quickly must also come to an immediate stop. However, suddenly arresting the ink momentum gives rise to a pressure pulse in the ink line. The components making up the printhead are typically stiff and provide almost no flex as the column of ink in the line is brought to rest. Without any compliance in the ink line, the pressure spike can exceed the Laplace pressure (the pressure provided by the surface tension of the ink at the nozzles openings to retain ink in the nozzle chambers) and flood the front surface of the printhead nozzles. If the nozzles flood, ink may not eject and artifacts appear in the printing. 
     Resonant standing waves in the ink occur when the nozzle firing pattern matches a resonant frequency of the ink supply line. Again, because of the stiff structures that define the ink line, a large proportion of nozzles for one color, firing simultaneously, can create a standing wave in the ink line. For example, printing spaced black lines for, say, a table of data, will fire many, if not most, of the black nozzles at a particular frequency. If this particular frequency matches a resonant frequency of the ink supply structure, a standing wave can start oscillating back and forth. This can result in nozzle flooding, or conversely nozzle deprime because of the sudden pressure drop after the spike, if the Laplace pressure is exceeded. 
     The Applicant has addressed these issues by incorporating non-priming cavities into the printhead. A detailed description of the non-priming cavities is provided in the Applicant&#39;s co-pending U.S. Ser. No. 11/688,863, the contents of which is incorporated herein by reference. Briefly, the stiff structures that define the ink line have air pockets distributed long the length of the printhead. A pressure pulse from a resonant standing wave in the ink will compress the air in the cavity as it passes that point in the ink line. Compressing the air in the cavity damps and dissipates the pressure pulse. The reduced pulse amplitude is less likely to flood the nozzles. 
     Unfortunately, the lowest resonant frequencies of the ink line have the highest pressure amplitudes. To damp these pressure waves, the non-priming cavities need to be impractically large. A series of large air pockets positioned along the ink line is counter to compact design. Furthermore, diurnal heating and cooling of big air cavities would either pump a large volume of ink out through the nozzles, or deprime the nozzles by drawing ink back into the support molding. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention provides a printhead for an inkjet printer, the printhead comprising: 
     at least one printhead integrated circuit (IC) with an array of nozzles for ejecting ink; 
     a support structure for supporting the printhead IC, the support structure having an ink conduit for supplying the array of nozzles with ink, the conduit having a set of resonant frequencies at which ink in the conduit generates a standing wave in response to certain operating modes of the array of nozzles; and, 
     a fluidic damper having a selected resonant frequency that damps the standing waves associated with each of the set of resonant frequencies such that they have an amplitude less than a maximum threshold. 
     The invention recognizes that particular resonant frequencies are more problematic than others. Typically, the lowest frequency harmonic causes an oscillating pulse with the highest amplitude. However, tuning the fluidic damper precisely to the frequency of the lowest harmonic changes the amplitude of the standing waves at the other frequencies and the next lowest harmonic can then be a problem. Tuning the damper to resonate at a frequency between the two lowest resonant frequencies can sufficiently damp the pressure amplitudes at all the resonant frequencies. The fluid damper uses a single thin tube of ink acting against a compliant structure such as an air cavity. The tube of ink and the air cavity are far more compact than a line of large air cavities along the length of the printhead. Similarly, expansion and contraction of the single small air cavity due to diurnal temperature changes are not problematic. 
     Preferably, the selected resonant frequency of the fluidic damper is between the two lowest resonant frequencies in the set of resonant frequencies. In a further preferred form, the selected resonant frequency is the root mean square of the two lowest resonant frequencies in the set of resonant frequencies—that is, the square root of the product of the lowest two frequencies. 
     Preferably, the fluidic damper has a cavity of compressible fluid connected to the ink conduit via a tube configured to at least partially prime with ink when the printhead primes. In a further preferred form, the compressible fluid is air trapped when the printhead is primed with ink. In particular embodiments, the printhead is a pagewidth printhead for printing on A4-sized media, the ink line having a main channel extending longitudinally along the length of the printhead between the inlet and the outlet, the ink line also having a series of non-priming air cavities positioned along its length. 
     In specific embodiments, the support structure has an inlet for connecting the ink line to an ink supply, and an outlet for connecting the ink line to a waste ink reservoir, the fluidic damper being connected to the ink line adjacent the outlet. Preferably, the fluidic damper has less than 0.4 ml of air. 
     Optionally, the maximum threshold pressure is less than 4 kPa. Optionally, the ink pressure at the array of nozzles is maintained above −3 kPa to avoid deprime and keep ejected drop volumes above a minimum volume. 
     In a particularly preferred form, the printhead is configured to print different colored inks, each ink color having a respective fluidic damper, the fluidic damper for one color having a resonant frequency that differs from at least one of the other colors. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Preferred embodiments of the invention will now be described by way of example only, with reference to the accompanying drawings, in which: 
         FIG. 1  is a schematic representation of a prior art printer&#39;s fluidic system; 
         FIGS. 2A ,  2 B and  2 C show the standing waves for the lowest three resonant modes of the printhead ink supply line shown in  FIG. 1 ; 
         FIG. 3A  shows the peak pressures in the ink as a function of frequency for the ink line without a fluidic damper; 
         FIG. 3B  shows the peak pressures in the ink as a function of frequency for the ink line with a fluidic damper tuned to resonate at the first resonant frequency of the ink line; 
         FIG. 3C  shows the peak pressures in the ink as a function of frequency for the ink line with a fluidic damper tuned to resonate at root mean square of the two lowest resonant frequencies of the ink line; 
         FIG. 4  is a schematic representation of the printhead assembly with fluidic damper according to the present invention; 
         FIG. 5  shows the printhead cartridge of the present invention installed the print engine of a printer; 
         FIG. 6  shows the printhead cartridge of the present invention removed from the print engine of a printer; 
         FIG. 7  is a perspective of the complete printhead cartridge according to the present invention; 
         FIG. 8  shows the printhead cartridge of  FIG. 7  with the protective cover removed; 
         FIG. 9  is an exploded is a partial perspective of the printhead assembly within the printhead cartridge of  FIG. 7 ; 
         FIG. 10  is an exploded perspective of the LCP moldings within the printhead cartridge of  FIG. 7 ; and, 
         FIGS. 11A ,  11 B and  11 C show the outlet manifold of the printhead cartridge. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       FIG. 1  is a schematic view of a prior art fluidic system of the type used in the above referenced U.S. Ser. No. 11/688,863. The operation of the system and its individual components are described in detail in U.S. Ser. No. 11/872,719, the contents of which are incorporated herein by reference. 
     Briefly, the printer fluidic system has a printhead assembly  2  supplied with ink from an ink tank  4  via an upstream ink line  8  and waste ink is drained to a sump  18  via a downstream ink line  16 . A single ink line is shown for simplicity. In reality, the printhead has multiple ink lines for full colour printing. The upstream ink line  8  has a shut off valve  10  for selectively isolating the printhead assembly  2  from the pump  12  and or the ink tank  4 . The pump  12  is used to actively prime or flood the printhead assembly  2 . The pump  12  is also used to establish a negative pressure in the ink tank  4 . During printing, the negative pressure is maintained by the bubble point regulator  6 . 
     The printhead assembly  2  is an LCP (liquid crystal polymer) molding  20  supporting a series of printhead ICs  30  secured with an adhesive die attach film (not shown). The printhead ICs  30  have an array of ink ejection nozzles for ejecting drops of ink onto the passing media substrate  22 . The nozzles are MEMS (micro electromechanical) structures printing at true 1600 dpi resolution (that is, a nozzle pitch of 1600 npi), or greater. The fabrication and structure of suitable printhead IC&#39;s  30  are described in detail in U.S. Ser. No. 11/246,687 the contents of which are incorporated by reference. The LCP molding  20  has a main channel  24  extending between the inlet  36  and the outlet  38 . The main channel  24  feeds a series of fine channels  28  extending to the underside of the LCP molding  20 . The fine channels  28  supply ink to the printhead ICs  30  through laser ablated holes in the die attach film. 
     Above the main channel  24  is a series of non-priming air cavities  26 . These cavities  26  are designed to trap a pocket of air during printhead priming. The air pockets give the system some compliance to absorb and damp pressure spikes or hydraulic shocks in the ink. The printers are high speed pagewidth printers with a large number of nozzles firing rapidly. This consumes ink at a fast rate and suddenly ending a print job, or even just the end of a page, means that a column of ink moving towards (and through) the printhead assembly  2  must be brought to rest almost instantaneously. Without the compliance provided by the air cavities  26 , the momentum of the ink would flood the nozzles in the printhead ICs  30 . Furthermore, the subsequent ‘reflected wave’ can generate a negative pressure strong enough to deprime the nozzles. 
     In the majority of cases, the air cavities  26  offer sufficient damping. However, the printhead can operate in modes that excite the ink to one of the resonant frequencies of the ink line. For example, printing black lines across a page at a particular spacing (for a table, bar code or the like) requires all the black nozzles to fire simultaneously for brief periods. This cyclic input to the ink line can quickly establish a standing wave oscillating at a resonant frequency. The peak to peak pressures of these standing waves can overwhelm the damping provided by the air cavities  26  and flood or deprime the nozzles. The volume of the air cavities would need to be greatly increased in order to accommodate the peak pressures of the standing waves. 
       FIGS. 2A ,  2 B and  2 C, show the three lowest harmonics for printhead assembly shown in  FIG. 1 . It should be noted that the main channel responds as if it is a blind end even though it has the outlet  38 . Because it is a closed end, the main channel resonates with a quarter wave harmonic, a three quarter wave harmonic, a 1.25 wave harmonic and so on. An open end would resonate at 0.5 wave, full wave, 1.5 wave and so on. The lowest harmonics have the highest amplitude standing waves and therefore, are the most problematic. If these harmonics occur at frequencies at which the printhead can operate, there is the potential for pressure pulses above the flooding threshold and below the deprime threshold. Nozzle flooding or deprime occurs when the ink pressure exceeds the Laplace pressure of the ink meniscus across the nozzle aperture. Obviously, this will depend on nozzle geometry (as well as other factors such as operating temperature). 
       FIG. 2A  is the lowest frequency harmonic; the quarter wave, in which the length L of the LCP main channel is one quarter the wavelength. Testing on some of the Applicant&#39;s A4 printers has shown this to occur at about 12 Hz and has a peak amplitude of about 9 kPa. The next harmonic is the 0.75 wave shown in  FIG. 2B . It has a lower amplitude (approx. 5 kPa) and occurs at 36 Hz. Finally, the 1.25 wave is shown in  FIG. 2C  which has an amplitude of about 2 kPa at 60 Hz. As the frequency of the harmonic increases, the amplitude of the wave rapidly attenuates. Hence the higher frequency harmonics have peak pressures small enough for the non-priming air cavities to damp. 
       FIG. 3A  shows these pressure peaks as function of frequency. If the deprime and flood thresholds are set at, say, −3 kPa and 4 kPa respectively, it can be seen that the quarter wave and three quarter wave harmonics have peak pressures that will be problematic for printer operation. However, incorporating a damper that resonates at the quarter wave frequency does not solve the problem.  FIG. 3B  shows the change in the frequency response curves when a fluidic damper tuned to the quarter wave is added to the end of the main channel  24  (see  FIG. 1 ). Essentially the main channel now responds as if it were an open channel and the half wave, full wave etc harmonics become relevant. One or more of these harmonics may also generate excessive peak pressures. 
       FIG. 3C  shows the frequency response when the fluidic damper is tuned to a frequency between the quarter and half wave harmonics. This attenuates both the quarter and half wave harmonics. The Applicant has found that the optimum resonant frequency for the fluidic damper is approximately the root mean square of the quarter wave frequency and the half wave frequency; that is, the square root of the product of the quarter wave resonant frequency and the half wave resonant frequency. In reality, it is necessary to test several frequencies around the root mean square frequency to find to the optimum resonant frequency for the fluidic damper. Irregularities such as ink filters, bends and elasticity in the ink supply line and so on shift the actual pressure response curves from the theoretical curves. 
       FIG. 4  is a schematic representation of the printhead assembly  2  according to the present invention. The LCP molding  20  has a fluidic damper  40  that resonates at a frequency selected to attenuate potentially problematic standing waves at any of the resonant frequencies of the main channel  24 . The fluidic damper  40  has a thin tube  32  filled with ink connecting the main channel  24  to a small cavity of compressible fluid  34 —most typically air. The thin tube of ink has an inertance proportional to its length, cross sectional area and density of the ink. The air cavity is a compliance against which the ink in the thin tube  32  can oscillate. 
     In the printhead assembly shown, the fluidic damper is tuned to a frequency at or near the root mean square of the quarter wave and the half wave resonant frequency of the main channel  24  in the LCP molding  20 . As discussed above, the impedance provided by the damper at the quarter and half wave harmonics is sufficient to keep both of them less than the predetermined pressure threshold. Positioning the fluidic damper  40  adjacent the outlet  38  of the main channel  24  is most effective as it transmits the majority of the standing wave and the reflected wave is small. 
     The invention will now be described with reference to the Applicant&#39;s printhead cartridge and print engine shown in  FIGS. 5 and 6 . A printhead cartridge recognizes that individual ink ejection nozzles may fail over time and eventually there are enough dead nozzles to cause artifacts in the printed image. Allowing the user to replace the printhead maintains the print quality without requiring the entire printer to be replaced. The print engine  3  is the mechanical heart of a printer which can have many different external casing shapes, ink tank locations and capacities, as well as different media feed and collection trays. 
       FIG. 5  shows a printhead cartridge  2  installed in a print engine  3 . The printhead cartridge  2  is inserted and removed by the user lifting and lowering the latch  126 . The print engine  3  forms an electrical connection with contacts on the printhead cartridge  2  and fluid couplings  120  are formed at the inlet and outlet manifolds,  48  and  50  respectively. 
       FIG. 6  shows the print engine  3  with the printhead cartridge removed to reveal the apertures  122  in the fluid couplings  120 . The apertures  122  engage spouts on the inlet and outlet manifolds ( 48  and  50  of  FIG. 5 ). The fluid couplings  120  connect the inlet manifold to an ink tank, and the outlet manifold to a sump. As discussed above, the ink tanks, media feed and collection trays have an arbitrary position and configuration relative to the print engine  3  depending on the design of the printer&#39;s outer casing. 
       FIG. 7  shows the printhead assembly  2  as a printhead cartridge for user insertion and removal from the printer body (see  FIG. 6 ). The printhead cartridge  2  has a top molding  44  and a removable protective cover  42 . The top molding  44  has a central web for structural stiffness and to provide textured grip surfaces  58  for manipulating the cartridge during insertion and removal. The base portion of the protective cover  42  protects the printhead ICs (not shown) and line of contacts (not shown) prior to installation in the printer. Caps  56  are integrally formed with the base portion and cover the ink inlets and outlets (see  54  and  52  of  FIG. 9 ). 
       FIG. 8  shows the printhead assembly  2  with its protective cover  42  removed to expose the printhead ICs on the bottom surface and the line of contacts  33  on the side surface. The protective cover is discarded to the recycling waste or fitted to the printhead cartridge being replaced to contain leakage from residual ink.  FIG. 9  is a partially exploded perspective of the printhead assembly  2 . The top cover  44  has been removed reveal the inlet manifold  48  and the outlet manifold  50 . The inlet and outlet shrouds  46  and  47  have been removed to better expose the five inlet and outlet conduits,  52  and  54  respectively. The inlet and outlet manifolds  48  and  50  form a fluid connection between each of the individual inlets and outlets and the corresponding main channel  24  (see  FIG. 11 ) in the LCP molding  20 . As discussed above, the main channels extend beneath the line of non-priming air cavities  26 . 
       FIG. 10  is an exploded perspective of the printhead assembly without the inlet or outlet manifolds or the top cover molding. The main channels  24  for each ink color and their associated air cavities  26  are formed in the channel molding  68  and the cavity molding  72 . Adhered to the bottom of the channel molding  68  is a die attach film  66 . As discussed above in relation to  FIG. 1 , the die attach film  66  mounts the printhead ICs  30  to the channel molding such that the fine channels on the underside of the are in fluid communication with the printhead ICs  30  via small laser ablated holes through the film. 
     Flex PCB  70  is adhered to the side of the air cavity molding  72  and wraps around to the underside of the channel molding  68 . The printer controller connects to the lines of contacts  33 . At the other side of the flex PCB  70  is a line of wire bonds  64  to electrically connect the conductors in the flex  70  to each of the printhead ICs  30 . The wire bonds  64  are covered in encapsulant  62  which is profiled to have a predominantly flat outer surface. On the other side of the air cavity molding  72  is a paper guide  74  to direct sheets of media substrate past the printhead ICs at a predetermined spacing. 
       FIGS. 11A ,  1 B and  1 C show the outlet manifold  50  detached from the rest of the printhead cartridge. Interface plate  76  has outlet spouts  54  for connection to the ink sump housed in the printer body. The coupling  60  connects to each of the main channels  24  in the channel molding  68  (see  FIG. 10 ). As shown in  FIGS. 11B and 11C , the inner side of the interface plate  76  supports the thin inks tubes  32  and the air cavities  34  for the respective main channels. The ink line outlets  38  connect to the thin tubes  32  immediately before the air cavities  34 . The air cavities  34  and the thin tubes  32  are sealed from each other with the heat sealable foil  78  applied to the back of the outlet manifold  50 . The foil  78  is heat sealed around the entire perimeter of the five air cavities and ink tubes as it is essential that they are completely sealed from each other. To ensure the seal is not compromised during use, the heat seal resists internal pressure to 100 kPa. 
     When the printhead assembly primes, the ink flows through the thin tube  32  as far the outlet  38  only. The length of the ink column in the thin tube, the diameter of the tube and the properties of the ink determine an inertance for the ink in the tube. The inertance is equates to the dash-pot in the equivalent mechanical damper and the inductor in an electrical damper. The volume of the air cavity is relatively small; less than 0.4 ml, and typically between 0.15 ml and 0.3 ml. This provides to the spring in a mechanical damper or the capacitor in the corresponding electrical circuit. 
     As the main channels  24  of the channel molding  68  have slightly different configurations, the resonant frequencies are likewise different. Accordingly, the fluidic dampers for each main channel  24  are tuned to resonate at different frequencies for optimum damping of each ink line. 
     The invention has been described herein by way of example only. Skilled workers in this field will readily recognize many variations and modifications that do not depart from the spirit and scope of the broad inventive concept.