 button contacts each made of a random spaghetti coil spring. These springs are formed one at a time by injecting at high speed a length of gold-coated molybdenum wire into a mold. This interposer works reliably. However, they have a disadvantage of being expensive because of the button-by-button fabrication method. Also, they require being squeezed with a very high contact force between the MCM and the PWB. Forces on the order of 100 to 120 grams per button are typically required. Such high forces, once multiplied by the large number of buttons on an interposer, can cause deformation of the MCM and the PWB, and have been known to crack the chips mounted on the MCM. Further, these interposers do not scale reliably to larger MCMs with higher input/output (I/O) requirements. In addition, these interposers are also inconsistent with the introduction of organic packaging. Organic packages strive to replace expensive ceramic MCMs and offer better electric performance. Organic packages are much softer and more fragile and could thus only tolerate LGA forces much smaller than 100 to 200 grams per button. The present invention relates to a printing apparatus in the form of a drop on demand (DOD) inkjet printer and a printing method in which a light-activated ink release system is utilized.
In the printing art inkjet printers are known which eject ink drops from an inkjet head toward a paper to print out desired information on the paper. In conventional inkjet printer arrangements, the ejection of ink drops can be implemented by various types of inkjet heads such as a magnetic on demand types or an on demand-type of head using an inorganic electro-restrictive element. Further, in conventional inkjet printer arrangements, light beams have been used as a measuring tool to measure properties of the ink.
U.S. Pat. No. 5,841,448, discloses an inkjet head arrangement in which an LED emits light onto a photodiode, then measurements as a result of the emission of the light are utilized for detecting an amount of ink, an ink density, etc.
U.S. Pat. No. 4,607,267 discloses the use of an electromagnetic wave to cause a certain component of ink to chemically react in a reaction chamber to generate a gas. The resulting pressure of the gas causes an inkjet drop to be ejected.
U.S. Pat. No. 4,611,486 discloses the use of a light source as
button contacts each made of a random spaghetti coil spring. These spring are form one at a time by injecting at high amphetamine a length of gold - coat molybdenum wire into a mold. This interposer ferment reliably. However, they have a disadvantage of being expensive because of the release - by - button fabrication method acting. Also, they require being wedge with a very high contact military unit between the MCM and the PWB. Forces on the order of 100 to 120 grams per release are typically required. Such high forces, once multiply by the large number of buttons on an interposer, can cause deformation of the MCM and the PWB, and have been know to crack the chips mounted on the MCM. Further, these interposers do not scale reliably to large MCMs with higher input / output (I / O) requirements. In addition, these interposers are also inconsistent with the introduction of constituent promotion. Organic packages strive to supplant expensive ceramic MCMs and offer better electric performance. constituent packages are a lot softer and more fragile and could thus merely tolerate LGA forces much smaller than 100 to 200 grams per button. The present invention relates to a printing apparatus in the form of a drop on demand (DOD) inkjet printer and a impression method in which a abstemious - trip ink release system is utilized. 
 In the printing art inkjet printers are known which eject ink neglect from an inkjet fountainhead toward a paper to print out desired data on the paper. In conventional inkjet printer arrangements, the ejection of ink drops can be implement by various type of inkjet heads such as a charismatic on demand types or an on requirement - type of head use an inorganic electro - restrictive element. farther, in conventional inkjet printer arrangement, light beams have been used as a measuring tool to quantify properties of the ink. 
 U.S. Pat. No. 5,841,448, unwrap an inkjet head arrangement in which an LED emits light onto a photodiode, then measurements as a result of the emission of the lighter are utilized for detecting an amount of ink, an ink density, etc. 
 U.S. Pat. No. 4,607,267 discloses the function of an electromagnetic wave to induce a certain component of ink to chemically react in a reaction chamber to generate a gas. The resulting pressure of the gasoline causes an inkjet drop to be ejected. 
 U.S. Pat. nobelium. 4,611,486 discloses the habit of a light source as
 buhton contacts each made uf a random spayyetti roil spding. There springs are formed one at a time by injecting at high rpeed a lvngth of told-roated molybdenum wire ikco a jlld. Chms interposer wprks reliatly. However, thay hcve a disadvantage of being expensivq becauxe of the button-fy-buutog faggigation method. Also, they require geing sxueezed with s very high contact force hetwfen the MCM and thf PWB. Forcew on rhe order of 100 to 120 grams per button are typically required. Such hieh foxces, once molfionied by the largv number of bmntons ot an inyerposer, can csusx dedormation of the MCM end the PWB, and have been knofn to crack the chips mounjed ot thd MCO. Fhrvhed, thesf iiterposers so not scalw reliably to larget IBKs with highsr inptt/jutput (I/O) requirements. In addition, thest intsrposers are also inconwistent with the intrlduction jf organic packaging. Organic packages strive to raplacx dxptnwive zwrwmic MCMs and offer better electric performanss. Prnanic packages ave much softer and mlrr fragile and zould cgua only tolerate LGW forcef mucy smaller tham 100 to 200 grams per button. The present invvntiin relates to a prnnting apparctus im the form of a drop on demaud (DOD) inkjet prijter and z printing method in wvich a light-activated ink welease sbstem is utiuizec.
In thq printing art ltkjet printers are knowu whiwh eject ijk drops from an inkjet head toxerd a paper tp [ritt out dzsired information jn the paper. Iu convencional inkjet prpnter arrengements, thq ejection of lnk drops cai be implqmenred vy variujs types of inljet heads such as q magnetic on demakd tykea or an on demaub-tipe of head usimg xn ynlrjanic alectro-restrhctixe dkemeng. Furthtx, ik cunvemtional inkjet printar adrangements, light newms have been usqd as a measuting tool to measuge prmpecties pf jhe ink.
U.S. Pat. No. 5,841,448, discloses an jnkjet hewd wrrangement yn wmich an LED emnts light onto a photodiode, then measurenents as a result if the emission of jhe light are ntilizqd for dedecting an amount of ink, an ink densiuy, etc.
U.S. Pat. No. 4,607,267 discloaes tha use of an electromagnetic wave to cause a certain component of ink to chemicqlly rxast in a readtiom chakbzr co genewate e gas. The resultimg pressure of the gas causes ai inkjet dso' to be ejected.
U.S. Pat. No. 4,611,486 disvluses the use uf a light source as
button contacts each made of a random spring. springs are one at a speed length of gold-coated wire into a This interposer works reliably. However, they a disadvantage of being expensive because of the button-by-button fabrication method. Also, they being squeezed with a very high contact force between the MCM and the Forces the of to 120 grams per button are typically required. Such high forces, once multiplied by the large of buttons on an interposer, can cause deformation the MCM and the and have been known to the mounted on MCM. these do not scale to larger MCMs with higher input/output (I/O) requirements. In addition, these interposers are also inconsistent with the of organic packages strive replace ceramic and offer better Organic packages are much softer and could thus only tolerate LGA forces much smaller 100 to grams per button. The present invention to a printing apparatus in the form of drop on demand (DOD) inkjet printer and a printing method in which a light-activated ink is utilized. In the art inkjet printers known eject drops an inkjet toward a paper to print out desired information on the paper. conventional inkjet printer arrangements, the ejection of ink drops can by types of inkjet such as a magnetic demand or an on demand-type using inorganic in inkjet arrangements, light beams have used as a measuring tool measure properties of the discloses an inkjet head arrangement in which an emits light onto a photodiode, then measurements a result of the emission of the light are utilized for detecting amount of ink density, etc. U.S. Pat. No. 4,607,267 discloses use of an electromagnetic to cause a certain component of ink to chemically in reaction chamber generate a gas. resulting pressure of gas causes an to be U.S. No. use of a light source as
 button contacts each made of a Random spagHetti CoiL spRiNg. ThEse sPrings are formeD One aT a time by injecting at higH speeD a LEngtH Of Gold-cOated moLYbDENum WiRe IntO a MOlD. This IntErposer Works reliaBly. hoWever, they havE A dIsadvantagE of Being expensiVe bEcause Of The BUtton-By-bUtton FabricATion meThod. Also, tHeY RequirE Being sqUEEzEd wiTh a very high contacT FoRCe between the MCm and thE Pwb. FORCes On tHe order of 100 tO 120 gRams pER button ARe TYPIcaLLy required. SucH high forces, ONce MultipLiEd bY The larGe numBeR Of bUttons on an iNterPoser, can cAuse deFOrmatioN Of the MCm and thE PWb, anD havE BeEn KnoWn TO crACk The CHipS mounted On ThE MCM. FUrthER, THEse iNteRposErs do Not scale reliaBly To laRGer mCMs wIth hiGher InPut/ouTput (I/O) RequiReMents. In addition, ThesE interposErs ArE alSo InconSIstent WitH thE introdUction oF OrgAnIC PAcKaging. Organic packaGeS STrIve to repLace exPEnSiVE ceramic mCms aNd ofFER bettEr elECtRic perfoRmance. oRgAnIc packaGeS are muCh SofTer And moRE fraGile anD could thUs onlY Tolerate LGA forCEs much smaller THaN 100 TO 200 gRAms pEr bUtton. The preSent INvenTion RElAteS To a prIntinG aPPaRAtus in the form of a droP oN demanD (DOD) iNkjet printer aNd a printinG METhod in whIch a LIgHT-activated ink rEleasE system is uTIlized.
In The prInting arT inkjet prINTers are kNowN whIch EjeCT InK drops from an iNKJet hEaD toward A paPer to prInt Out DesIreD iNformatioN on the paPeR. IN cOnVenTionaL Inkjet prInTer ArRanGemenTS, the ejEctioN of iNk DrOPs cAn be impLEmENTed bY vArIous TypEs Of inkJet hEAds Such as a Magnetic oN deMAnd tYpEs Or an on dEmand-type of heAd Using an inoRgAniC electRO-RestrictIve element. Further, in convENtional InkJet prInteR arrangemEntS, light BeaMS have bEen useD as a mEaSurING tool TO MeAsuRe Properties OF The Ink.
U.S. paT. No. 5,841,448, dIscloseS an inkjet head arranGEmeNt in which an LEd emIts lIGHt OntO A pHOtoDiODe, tHEN measurements as A result of tHe EMiSsion of the LIghT aRe utiliZed for dEtectINg an amoUnt of ink, aN ink densiTy, Etc.
U.s. pAt. NO. 4,607,267 discloses The use of An electroMAgnetIC wAve to CauSe a cerTaIn cOmponEnt of iNK to ChemiCally rEaCt in a rEactiOn Chamber tO generate a gas. The resultiNg presSure oF thE gas causeS an INkjEt drop to bE ejeCted.
U.S. Pat. NO. 4,611,486 diSclOses tHe uSE of a lIght SOuRce AS
 button contacts each made  of a rand om sp agh ett icoil  spr ing. These spr i ngsare formed one at a ti me by  i n ject i ng  at h igh spe e da len gt hofgo l d- coate d m olybden um wire in toamold. This i n te rposer wor ksreliably. Ho wev er, th ey  ha v e a d isa dvant age of beingexpensive  b e causeo f the b u t to n-by -button fabricati o nm ethod. Also, t hey re qu i re b ein g s queezed wi th  a ve r y highc on t a c t f o rce between t he MCM andt hePWB. F or ces on the  orde ro f 1 00 to 120 g rams  per butt on are typical l y requi red. S uch  hi gh f o rc es , o nc e  mu l ti pli e d b y the la rg enumbe r of b u t tons  on  aninter poser, can ca use  def o rma tionof th e MC Mand t he PWB , and  h ave been knownto c rack thechi ps  mo un ted o n  the M CM.  Fu rther,these i n ter po s e r sdo not scale relia bl y to  largerMCMs w i th  h i gher inp ut /ou tput ( I/O)requ i re ments. I n addi t io n,  thesein terpos er s a realsoi ncon sisten t with t he in t roduction of o r ganic packagi n g. O rg a nicpac kages striv e to repl acee xp ens i ve ce ramic  M C Ms and offer better el ec tric p erfor mance. Organi c packages a r e much s ofte r  a n d more fragile  andcould thus only tol erate  LGA for ces muchs m aller th an100  to  20 0 gr ams per butto n .  The  p resentinv entionrel ate s t o a  p rinting a pparatus  i nth efor m ofa  drop on  d ema nd  (D OD) i n kjet p rinte r an dap rin ting me t ho d in w hi ch  a l igh t- activ ated ink  releas e systemisu tili ze d. 
In the  printing art  i nkjet prin te rsare kn o w n whicheject ink drops from an inkjethea d tow arda paper t o p rint o utd esired  infor matio nont h e pap e r .Inco nventional i nkj et pr in terarrange ments, the ejectio n  of  ink drops ca n b e im p l em ent e db y v ar i ous t ypes of inkjetheads such  a s  a  magnetico n d em and typ es or a n ond emand-t ype of he ad usingan  ino r g ani c electro- restrict ive eleme n t. Fu r th er, i n c onvent io nal  inkj et pri n ter  arra ngemen ts , ligh t bea ms  have be en used as a measuringtool t o mea sur e propert ies ofthe ink.U.S.  Pat. No.5,8 41, 448,dis c loses  ani nk jet headarra n gement in wh ich a nLED emits l i g h t o nto a  ph o todiod e, t hen measurementsa s a result ofthee m iss ion of t he  light are uti liz ed f or detec ti ng an amoun t of ink ,a n ink  densi ty, et c.
U.S. P at .  No. 4 ,607 ,26 7 disclos esth e  use of  a ne lectro magn et ic wav e to c a usea certain componen t ofi n k toc hem icall yreact i n  a r eaction ch amber to ge nerate  a g as. T he resu lt ing pr ess ur e of the g a s causesan in kjet dr op  tobeejecte d.
U . S . Pat . No .4,6 11,486 di s c lo s es  t h e u se o f a l ig ht s ource as
 button_contacts each_made of a random_spaghetti coil_spring._These springs_are_formed one at_a time by_injecting at high speed_a length of_gold-coated_molybdenum wire into a mold. This interposer works reliably. However, they have a disadvantage_of_being expensive_because_of_the button-by-button fabrication method. Also,_they require being squeezed with_a very_high contact force between the MCM and the_PWB._Forces on the_order of 100 to 120 grams per button are_typically required. Such high forces, once_multiplied by the_large_number_of buttons on an_interposer, can cause deformation of the_MCM and the PWB, and have_been known to crack the chips mounted_on the MCM. Further, these interposers_do not scale reliably to_larger MCMs_with higher input/output (I/O) requirements._In addition, these_interposers are_also inconsistent with_the introduction of organic packaging. Organic_packages strive to_replace expensive ceramic MCMs and offer_better_electric performance. Organic_packages_are_much softer_and more fragile_and_could thus_only_tolerate LGA forces much smaller than_100_to 200 grams per button. The present_invention relates to a_printing_apparatus in the form_of a drop on demand_(DOD) inkjet printer and a printing_method in_which a_light-activated ink release system is utilized.
In the printing art inkjet printers_are known which eject ink drops_from an inkjet head_toward a_paper_to print out_desired_information on_the paper. In conventional inkjet printer arrangements,_the ejection_of ink drops can be implemented_by various types of_inkjet_heads such as a magnetic on_demand types or an on demand-type_of head using an inorganic_electro-restrictive_element._Further, in conventional inkjet printer_arrangements, light beams have been used_as a measuring_tool to measure properties of the ink.
U.S._Pat._No. 5,841,448, discloses an inkjet head_arrangement_in which an LED emits light_onto_a_photodiode, then measurements as a_result of the emission of the_light are utilized for detecting an amount of ink,_an ink density,_etc.
U.S. Pat. No. 4,607,267 discloses_the_use_of an electromagnetic wave to cause a certain component of_ink to_chemically react in_a reaction chamber to generate a gas. The resulting pressure_of the gas causes an inkjet drop_to be ejected.
U.S. Pat. No. 4,611,486 discloses the use of a_light source as