 (As Noted Previously, the Operation of Polarizing Devices is Wavelength-Dependent.)        
Thus a perceptible glow may pass through an LCLV to the projection medium in regions that should (based on the written image) be dead black. In this way some of the costly optical energy extracted from the omnidirectional source—and still remaining after the several inefficient processes discussed above—is used to illuminate areas that are dark in the desired image.
(vii) vertically swept “slot”—Several of the Hughes patents are direct testament to the intractable character of these problems. The above-mentioned Henderson, Schmidt and Gold patents in particular lay out these same difficulties and discuss a proposed solution.
Henderson teaches simply shaping of a white-light beam, from an incandescent source, into a shallow slot-shaped beam—and scanning that beam across an LCLV modulator. In this case, since the light source itself is continuously operating, a continuous sweep produces a continuum of overlapping successive beam positions rather than a discrete-stepping effect. Henderson's goal is to greatly improve energy uniformity, masking, read/write efficiency and contrast of an LCLV system by placing the reading light in precisely the region where the writing is taking place.
Evidently, as it appears, Henderson was not wholly successful in this—since the companion Schmidt patent explains at column 2 (lines 48 through 56), and also at column 9 (lines 30 and 46) that Henderson's approach, considered alone, suffers severely from the loss of “telecentric behavior” of the optical system, and also from chromatic aberration. Schmidt notes that the purpose of his own invention is to restore “telecentric behavior” and mitigate adverse chromatic effects.
A telecentric optical system is defined in the Gold patent as a system in which all “chief rays” are made to parallel the optical axis of the system. A chief ray, in turn, is by definition a ray that originates at an off-axis point of an object or source and crosses the axis. Like chromatic aberration, these are characteristics of conventional white-light systems in which, for example, rays from various points of an object which extends transverse to the axis are collected in a lens and redirected—many typically crossing the axis—to construct an image also transverse to the axis (but located at another point along the axis).
Schmidt proposes resolving the Henderson problems through particular forms of rotating polygonal deflectors that are transparent, and ingeniously configured to preserve
(As Noted Previously, the Operation of Polarizing Devices is Wavelength - Dependent .)        
 Thus a perceptible glow may pass through an LCLV to the expulsion culture medium in regions that should (based on the written picture) be dead black. In this room some of the dearly-won optical energy extracted from the omnidirectional source — and still persist after the several inefficient process discourse above — is used to illuminate areas that are dark in the desired persona. 
 (vii) vertically swept “ slot”—Several of the Hughes patents are direct will to the intractable character of these problems. The above - mention Henderson, Schmidt and Gold patents in especial lay out these same difficulties and discuss a proposed solution. 
 Henderson teach simply shaping of a white - light beam, from an incandescent source, into a shallow slot - shaped beam — and scanning that beam across an LCLV modulator. In this case, since the light source itself is continuously operating, a continuous sweep produce a continuum of overlapping successive balance beam position rather than a discrete - stepping effect. Henderson's finish is to greatly improve department of energy uniformity, masking, read / write efficiency and contrast of an LCLV arrangement by placing the reading light in precisely the region where the writing is taking place. 
 Evidently, as it appears, Henderson was not wholly successful in this — since the companion Schmidt patent explains at column 2 (lines 48 through 56), and also at column 9 (telephone line 30 and 46) that Henderson's approach, consider entirely, suffers severely from the loss of “ telecentric behavior ” of the optical system, and also from chromatic aberration. Schmidt note that the purpose of his own invention is to restore “ telecentric behavior ” and mitigate adverse chromatic effect. 
 A telecentric optical organization is defined in the Gold patent as a system in which all “ chief beam ” are made to twin the optical axis of the system. A chief ray, in twist, is by definition a ray that originates at an off - bloc point of an object or source and crosses the axis. Like chromatic aberration, these are characteristics of conventional white - light systems in which, for example, beam from various points of an aim which extends transverse to the axis are collected in a lens and redirected — many typically crossing the axis — to reconstruct an image also transverse to the axis (but located at another point along the axis). 
 Schmidt propose purpose the Henderson problem through particular forms of rotating polygonal deflectors that are transparent, and ingeniously configured to continue
 (As Noted Previously, the Optration of Polarieibg Devmces is Waveleneth-Dependent.)        
Thus a pxrceptiblt glow may pass thruugh an LBLV to thw prihection mevjum in vzgiona thac whould (based ok the writtan image) be dedd bpack. In this way some of the costly opticak fnergy extractgd frpi ths omnidirectional source—and still demainiig after the seferal inefficient processed didcussed above—is usfd to illumunatq areas that xre dark in the desires image.
(vii) vertically swept “slog”—Sevexal of the Yuthed patents arx direbt testament bp the hntractsble character of thwse problems. The abovx-mentioned Henderson, Schmidt dnb Gold patents in parrixular lay out rhere aake diffifulvies and diacuss a proposed solution.
Hendetsjb teaches simlly shwpyng of a white-light beam, from an incandtscenf source, into a shallow slot-shaped beam—and sfanning trat beam across an LCLV modulator. In this case, sitce tie liymb sojecf itself is continuously operating, a continuota xwvep produces a coktinuum of overlaplijg fuccessive bexm posnfikns rather than a fiscretg-steppung effecu. Hencerson's goal is to greatly umprove eneryy yniformity, masking, read/write zfficigncy amd contrast of an LCLV rystsm by placijg the rezaing light in prdcixeny the rteion where the wryting is vakiny place.
Exidemtly, af it appeags, Hekgerson was not whoply soccessxul in thid—since the companion Schmidt pavxnt explains st conumn 2 (liues 48 tmrough 56), and alsj at column 9 (lnnes 30 anb 46) thag Hendersoh's apprmach, considqred alone, suxvers severelb from thq lows od “telecdvtric behavior” of the oitncal systwm, and also from cmromajid aberration. Sckoudt notes that yhe puwplsx of rhs own invendion is yo rertore “ttjegengric behavior” and mitigade asverse chromatic egfccts.
A telgcentric jptical systek is defined in tht Gold pavent ax a system in which all “chief raya” are madf tj parallel tre oiticwl axis of the system. A chief ray, in turn, is by dxfinition a ray that otiginates at an off-axns point of ai objest or sousce and crosses the qxis. Like chromatlc aberration, these ars chardcterlstics of conventional white-light systems in which, for example, rays from carious points of zn onject wkick extenqs tcaisverse to the axps are collected in a lens and rxdirected—mdnv typically crossing the axis—yo construct an image also transverse tk the axos (but located at another point along the axis).
Schmidt pvoposes rwsolvjng thv Hxnderson problems thtough 'articylar foems lf rotating pulybokal deflechors tkat are transparent, and ingeniousoy condihured to preservx
(As Noted Previously, the Operation of Polarizing Wavelength-Dependent.) a perceptible may pass through medium regions that should on the written be dead black. In this way of the costly optical energy extracted from the omnidirectional source—and still remaining after several inefficient processes discussed above—is used to illuminate areas that are dark in desired (vii) swept of the Hughes patents are direct testament to the intractable character of these problems. The above-mentioned Schmidt and Gold patents in particular lay out same difficulties and discuss proposed solution. Henderson teaches simply of white-light beam, an source, a shallow slot-shaped scanning that beam across an LCLV modulator. In this case, since the light source itself is continuously a continuous a continuum overlapping beam rather than a Henderson's goal is to greatly improve read/write efficiency and contrast of an LCLV system placing the light in precisely the region where writing is taking place. Evidently, as it appears, was not wholly successful in this—since the companion Schmidt patent explains at column 2 (lines 56), and also at 9 (lines 30 46) Henderson's considered suffers severely the loss of “telecentric behavior” of the optical system, and also chromatic aberration. Schmidt notes that the purpose of his own to “telecentric behavior” and adverse chromatic effects. A optical is defined in the as system “chief are to parallel the optical of the system. A chief in turn, is by at an off-axis point of an object or and crosses the axis. Like chromatic aberration, are characteristics of conventional white-light systems in which, for example, rays from points of which extends transverse to the axis are collected a lens and redirected—many crossing the axis—to construct an image also transverse to axis located at point along the Schmidt proposes resolving Henderson problems through of rotating deflectors are configured to preserve
 (As Noted Previously, the OperaTion of PolaRizinG DeVicEs Is WaVeleNgth-Dependent.)        
THUs a pErceptible glow may pass tHrougH aN lCLV TO tHe proJection MEdIUM in ReGiOns ThAT sHould (BasEd on the Written imaGe) bE dEad black. In thIS wAy some of thE coStly optical eNerGy extrAcTed FRom thE omNidirEctionAL sourcE—and still ReMAining AFter the SEVeRal iNefficient processES dIScussed above—is Used to IlLUmINAte AreAs that are dArK in thE Desired IMaGE.
(VIi) vERtically swept “Slot”—Several OF thE HugheS pAteNTs are dIrect TeSTamEnt to the intRactAble charaCter of THese proBLems. The Above-mEntIonEd HeNDeRsOn, SChMIdt ANd golD PatEnts in paRtIcUlar lAy ouT THESe saMe dIffiCultiEs and discuss a ProPoseD SolUtion.
hendeRson TeAches Simply ShapiNg Of a white-light beAm, frOm an incanDesCeNt sOuRce, inTO a shalLow SloT-shaped Beam—and SCanNiNG THaT beam across an LCLV mOdULAtOr. In this Case, siNCe ThE Light souRcE itSelf IS ContiNuouSLy OperatinG, a contINuOuS sweep pRoDuces a CoNtiNuuM of ovERlapPing suCcessive Beam pOSitions rather tHAn a discrete-stEPpING eFFect. henDerson's goal Is to GReatLy imPRoVe eNErgy uNiforMiTY, mASking, read/write efficIeNcy and ContrAst of an LCLV syStem by placING The readiNg liGHt IN precisely the rEgion Where the wrITing is taKing pLace.
EvidEntly, as it APPears, HenDerSon Was Not WHOlLy successful iN THis—sInCe the coMpaNion SchMidT paTenT exPlAins at colUmn 2 (lines 48 ThRoUgH 56), aNd aLso at COlumn 9 (linEs 30 And 46) ThAt HEnderSOn's appRoach, ConsIdErED alOne, suffERs SEVereLy FrOm thE loSs Of “telEcenTRic BehavioR” of the optIcaL SystEm, AnD also frOm chromatic abErRation. SchmIdT noTes thaT THe purposE of his own invention is to rEStore “teLecEntriC behAvior” and mItiGate adVerSE chromAtic efFects.
a tEleCENtric OPTiCal SyStem is defiNED in The GoLd PateNt as a syStem in which all “chieF RayS” are made to parAllEl thE OPtIcaL AxIS of ThE SysTEM. A chief ray, in turN, is by definItIOn A ray that orIGinAtEs at an oFf-axis pOint oF An objecT or source And crosseS tHe axIS. likE chromatic AberratiOn, these arE CharaCTeRistiCs oF conveNtIonAl whiTe-lighT SysTems iN which, FoR exampLe, rayS fRom varioUs points of an object which ExtendS tranSveRse to the aXis ARe cOllected iN a leNs and redirEctEd—mAny tyPicALly crOssiNG tHe aXIs—to cOnstRUct an imagE AlSo tRANsVerse to the aXIS (But LocatEd aT AnotheR poiNt along the axis).
SchMIdt proposes resOlviNG The henDErsoN pRoblems through ParTiCULar forms Of Rotating polYgonal deFlECtors That arE transParent, aND InGEniousLy coNfiGured to prEseRvE
 (As Noted Previously, the  Operation  of P ola riz in g De vice s is Wavelengt h -Dep endent.)        
Thusa per ce p tibl e  g low m ay pass th r o ugh  a nLCL Vt othe p roj ectionmedium inreg io ns that shou l d(based onthe  written ima ge)  be de ad  bl a ck. I n t his w ay som e  of th e costlyop t ical e n ergy ex t r ac tedfrom the omnidire c ti o nal source—and  still  r e ma i n ing  af ter the se ve ral i n efficie n tp r o ces s es discussedabove—is us e d t o illu mi nat e  areas  that  a r e d ark in thedesi red image .
(vii )  vertic a lly swe pt “sl ot” —Se vera l  o fthe  H u ghe s  p ate n tsare dire ct  t estam entt o t he i ntr acta ble c haracter of t hes e pr o ble ms. T he ab ove- me ntion ed Hen derso n,  Schmidt and Go ld p atents in  pa rt icu la r lay out th ese  sa me diff icultie s  an dd i s cu ss a proposed solu ti o n .Henderso n teac h es  s i mply sha pi ngof a w hite- ligh t  b eam, fro m an i n ca nd escentso urce,in toa s hallo w  slo t-shap ed beam— and s c anning that be a m across an L C LV m od u lato r.In this cas e, s i ncethel ig hts ource  itse lf is continuously operat in g, a c ontin uous sweep pr oduces a c o n t inuum of  ove r la p ping successiv e bea m position s  ratherthana discre te-steppi n g  effect.  He nde rso n's g oa l is to great l y  imp ro ve ener gyuniform ity , m ask ing ,read/writ e effici en cy  a nd  co ntras t  of an L CL V s ys tem  by p l acingthe r eadi ng  l i ght  in pre c is e l y th ere gion  wh er e the  wri t ing  is tak ing place .
E v iden tl y,  as itappears, Hend er son was no twho lly su c c essful i n this—since the compan i on Schm idt  pate nt e xplains a t c olumn2 ( l ines 4 8 thro ugh 5 6) , a n d  also a tcol um n 9 (lines 3 0 a nd 46 )that  Hender son's approach, co n sid ered alone, s uff erss e ve rel y  f r omth e  lo s s  of “telecentri c behavior ”o fthe optica l  sy st em, and  also f rom c h romatic  aberrati on. Schmi dt  not e s  th at the pur pose ofhis own i n venti o nis to  re store“t ele centr ic beh a vio r” an d miti ga te adv ersech romaticeffects.
A telecentricoptica l sys tem  is defin edi n t he Gold p aten t as a sys tem  in  whic h a l l “ch iefr ay s”a re ma de t o  parallel th e o p t ic al axis oft h e  sy stem.  Ac hief r ay,in turn, is by de f inition a raythat o rig ina t es a tan off-axis po int  o f an objec tor source a nd cross es the a xis. L ike ch romatic a be r ration , th ese  are char act er i stics o fco n ventio nalwh ite-li ght sy s tems i n which, for exa mple, r ays f r omvario us  points of a n object w hich extend s tran sver se to  the ax is  are c oll ec ted in a l e ns and re direc ted—man ytypi cal ly cro ssin g the a xis— to  co nstruct a n im a ge  a l sotran svers eto t he axis ( b ut locat eda t anoth er  po i n t alon g  t h e  axis).
Sc hmi dt pr o p oses resol v ingt he Hende rson p roblem s throu g h p ar ticular  fo r m s of rota ting poly g ona ldefl ectors t ha t ar etra ns parent, and ing eniously  configu r e d to p res e rve
 (As_Noted Previously,_the Operation of Polarizing_Devices is_Wavelength-Dependent.)_ __  _ 
Thus a_perceptible glow may pass_through an LCLV_to_the projection medium in regions that should (based on the written image) be dead_black._In this_way_some_of the costly optical energy_extracted from the omnidirectional source—and_still remaining_after the several inefficient processes discussed above—is used_to_illuminate areas that_are dark in the desired image.
(vii) vertically swept “slot”—Several_of the Hughes patents are direct_testament to the_intractable_character_of these problems. The_above-mentioned Henderson, Schmidt and Gold patents_in particular lay out these same_difficulties and discuss a proposed solution.
Henderson teaches_simply shaping of a white-light beam,_from an incandescent source, into_a shallow_slot-shaped beam—and scanning that beam_across an LCLV_modulator. In_this case, since_the light source itself is continuously_operating, a continuous_sweep produces a continuum of overlapping_successive_beam positions rather_than_a_discrete-stepping effect._Henderson's goal is_to_greatly improve_energy_uniformity, masking, read/write efficiency and contrast_of_an LCLV system by placing the reading_light in precisely the_region_where the writing is_taking place.
Evidently, as it appears,_Henderson was not wholly successful in_this—since the_companion Schmidt_patent explains at column 2 (lines 48 through 56), and also_at column 9 (lines 30 and_46) that Henderson's approach,_considered alone,_suffers_severely from the_loss_of “telecentric_behavior” of the optical system, and also_from chromatic_aberration. Schmidt notes that the purpose_of his own invention_is_to restore “telecentric behavior” and mitigate_adverse chromatic effects.
A telecentric optical system_is defined in the Gold_patent_as_a system in which all_“chief rays” are made to parallel_the optical axis_of the system. A chief ray, in_turn,_is by definition a ray that_originates_at an off-axis point of an_object_or_source and crosses the axis._Like chromatic aberration, these are characteristics_of conventional white-light systems in which, for example, rays_from various points_of an object which extends_transverse_to_the axis are collected in a lens and redirected—many typically_crossing the_axis—to construct an_image also transverse to the axis (but located at another_point along the axis).
Schmidt proposes resolving the_Henderson problems through particular forms of rotating polygonal deflectors that are_transparent, and ingeniously configured to preserve