 ferrule and an XZ-plane is defined so that the ridge of the wedge-shaped lens lies in the XZ-plane, the wedged and lensed optical fiber is supported together with the ferrule so that the ridge is in parallel with a grinding surface and thereafter the optical fiber is tilted, whereby a pair of inclined surfaces are formed on the tip end of a conical surface of the optical fiber and the ferrule so that each of the surfaces has an inclination angle (xcex1) with respect to a plane perpendicular to the XZ-plane, and the ridge is formed into one of a semi-cylindrical surface and a conical surface on the optical fiber together with the conical surface of the ferrule by the grinding.
The inclination of the generatrix of the cone of the ferrule at the tip end of the optical fiber is made substantially equal to the inclination angle a of the inclined surfaces.
The ferrule may be provided with an index determining the direction in which the ridge extends. The index may be formed by partly changing the columnar surface of the ferrule into some shape. Alternatively, the index may be implemented by providing a machined part fixed to the ferrule.
One of the semi-cylindrical surface and the conical surface formed on the ridge serves as a positive lens in the YZ-plane.
The inclination angle (xcex2) of the ridge at the tip end of the optical fiber is set so that xcex2xe2x89xa71xc2x0. Conventionally, to utilize a field-effect liquid crystal display device where the liquid crystals are in the twisted nematic mode, nematic liquid crystals of high positive dielectric anisotropy are utilized. The interior surfaces of the plates constituting the cell which holds the liquid crystal material are each unidirectionally rubbed with a material such as cotton, and the plates are mounted so that the rubbing directions of the opposed plates are at 90.degree. to each other. The molecules immediately adjacent to the inner surfaces of the plates orient themselves in the rubbing directions, and the molecules intermediate the plates form themselves into a helix of one-quarter turn. It is believed that minute grooves are formed by the rubbing and that the liquid crystal molecules fall into the grooves with the molecular axes parallel to the direction of the grooves. Where the rubbing directions, as indicated, are at right angles to each other and the liquid crystal cell is between crossed polarizer plates, then, in the absence of an electric field, light is transmitted through the system
ferrule and an XZ - plane is defined so that the ridge of the wedge - shaped lens dwell in the XZ - airplane, the wedged and lensed optical roughage is support together with the ferrule so that the ridge is in parallel with a grind airfoil and thereafter the optical roughage is tilted, whereby a pair of disposed surfaces are formed on the tip end of a conic surface of the optical roughage and the ferrule so that each of the surfaces has an dip angle (xcex1) with respect to a plane vertical to the XZ - plane, and the ridge is formed into one of a semi - cylindrical open and a conical open on the optical fiber together with the conical surface of the ferrule by the grinding. 
 The tendency of the generatrix of the cone of the ferrule at the tip end of the optical fiber is made substantially equal to the inclination angle a of the inclined surfaces. 
 The ferrule may be provided with an index determining the direction in which the ridge extends. The index may be form by partly changing the columniform open of the ferrule into some condition. Alternatively, the index may be implemented by providing a machined part fixed to the ferrule. 
 One of the semi - cylindrical surface and the conic surface formed on the ridge serves as a positive lens in the YZ - plane. 
 The inclination angle (xcex2) of the ridge at the tip end of the optical fiber is set so that xcex2xe2x89xa71xc2x0. Conventionally, to use a field - impression fluid crystal display device where the liquid crystals are in the twisted nematic mood, nematic liquid crystals of high positive insulator anisotropy are utilized. The inner surfaces of the plates establish the cell which halt the liquid crystal fabric are each unidirectionally rubbed with a material such as cotton, and the plates are mounted so that the rub directions of the oppose plates are at 90.degree. to each other. The atom immediately adjacent to the inner surface of the plates tailor themselves in the rubbing directions, and the molecules intermediate the plate shape themselves into a helix of one - quarter bend. It is believed that minute grooves are formed by the rubbing and that the liquid quartz glass molecules fall into the grooves with the molecular axes parallel to the direction of the grooves. Where the rubbing directions, as indicate, are at good angles to each other and the liquid crystal cell is between crossed polarizer plates, then, in the absence of an electric battlefield, light is transmitted through the system
 fegrule and an XZ-plane is aefined so that the rivge of fhe wedgd-shaped lens lies in the XZ-ppabe, tht wedged and lensed optical viber is supkorted together wmfh the nzrruls so chet the ridge is in parallal with a gringivg surface and thereafter the optical fiber os tilted, wherebi a psyr or inclined surfaces are formed on fhe tip end of a conocal surface of the opticap fiher and the ferrulf so that eqch jd the surfacds has an puclination zngle (xcex1) with respect to a plxne pzrpendiculat fo jhe XZ-plane, end thv ridge is fovked indo one pf a semi-cylincriral wurface and a conical surface on the opjical fibes cogether with the conucql sutface of gye werduke by thf gcinding.
The jnclination of the generatrix pf nne cone of tge ferwuje at the tip end of the optical fiber ps mzde substantially equal to the inclination ajgle a of the inclined surfaces.
The ferrule may be provided with xn nkqdz fetermining the direction in which the ridge qsttndx. The index man be formed by parylj vranging the culumnax shrface of the ferrkle intj somw shape. Ajtermatively, the index may be inplemented bj prividing a machined part fixed to jhe fetrule.
One of the semi-cylnndriczl surface wnd the ckvical surface fofmec mn the ridge serves as a pjsitive lxns iu the YZ-olang.
The inslination wngle (xcex2) of the ridge wt thg tip and of the optical fiber is set so that xrxx2xe2x89xa71xc2x0. Comvantponally, tj utikize a field-esfect liquid ctystal difplay device whvre the lmquid crystajs are in the jwisted nematmc mode, nqmatuc luquid cfhstals of high positive dielectrix anisotropy are ubilizgd. The interior sbxfqces of the playes cogsnitnting dhe cell whiwh huldr the uiquid crysbal matrrial are each unidisectjonally rubbed witn w materiql such ws cotton, and the plates are moknted so that thg rubbing directions of the oppksed platfs wre at 90.degreq. to each other. Che molecules immediately adjacent to thx inner surfaces of thg plates orient themsglvts in the rubuing dyrections, and the molecules ibtermediate the pkates form themselves into d hellx of one-quarter turn. It is believed that minute grooves are formed by thw rubbmnd and that fhe kiquig eryxtal mjlecnlxs fall into the brooves with the molecular axes parallen co the direction of the groovrs. Where the rucbing directions, as indidated, arr at right angles to each other and the liquid crystal gell is bwtweeh crossed 'olarizer plates, them, in tke abswnce of an clectric field, libhb is translitttd tkrough the system
ferrule and an XZ-plane is defined so ridge the wedge-shaped lies in the optical is supported together the ferrule so the ridge is in parallel with grinding surface and thereafter the optical fiber is tilted, whereby a pair of surfaces are formed on the tip end of a conical surface of the fiber the so each of the surfaces has an inclination angle (xcex1) with respect to a plane perpendicular to XZ-plane, and the ridge is formed into one a semi-cylindrical surface and conical surface on the optical together the conical of ferrule the grinding. The of the generatrix of the cone of the ferrule at the tip end of the optical fiber made substantially the inclination a the surfaces. The ferrule provided with an index determining the the ridge extends. The index may be formed partly changing columnar surface of the ferrule into shape. Alternatively, the index may be implemented by a machined part fixed to the ferrule. One of the semi-cylindrical surface and the conical on the ridge serves a positive lens the The angle of the at the tip end of the optical fiber is set so xcex2xe2x89xa71xc2x0. Conventionally, to utilize a field-effect liquid crystal display device liquid are in the nematic mode, nematic liquid of positive dielectric anisotropy are interior of the which the liquid crystal material each unidirectionally rubbed with a such as cotton, and that the rubbing directions of the opposed plates at 90.degree. to each other. The molecules adjacent to the inner surfaces of the plates orient themselves in the directions, and intermediate the plates form themselves into a helix one-quarter turn. It is that minute grooves are formed by the rubbing and the crystal molecules into the grooves the molecular axes to the direction grooves. Where rubbing as right angles to each other and liquid cell is between crossed polarizer then, absence of an electric field, light is transmitted through the system
 ferrule and an XZ-plane is defiNed so that tHe ridGe oF thE wEdge-ShapEd lens lies in thE xZ-plAne, the wedged and lensed oPticaL fIBer iS SuPportEd togetHEr WITh tHe FeRruLe SO tHat thE riDge is in Parallel wiTh a GrInding surfacE AnD thereafteR thE optical fibeR is Tilted, WhEreBY a paiR of IncliNed surFAces arE formed on ThE Tip end OF a conicAL SuRfacE of the optical fibeR AnD The ferrule so thAt each Of THe SURfaCes Has an incliNaTion aNGle (xcex1) WItH RESpeCT to a plane perpEndicular to THe Xz-plane, AnD thE Ridge iS formEd INto One of a semi-cYlinDrical surFace anD A conicaL Surface On the oPtiCal FibeR ToGeTheR wITh tHE cOniCAl sUrface of ThE fErrulE by tHE GRIndiNg.
THe inClinaTion of the geneRatRix oF The Cone oF the fErruLe At the Tip end Of the OpTical fiber is madE subStantiallY eqUaL to ThE inclINation AngLe a Of the inClined sURfaCeS.
tHE fErrule may be provideD wITH aN index deTerminINg ThE DirectioN iN whIch tHE Ridge ExteNDs. the index May be fORmEd By partlY cHanginG tHe cOluMnar sURfacE of the Ferrule iNto soME shape. AlternatIVely, the index mAY bE IMpLEmenTed By providing A macHIned Part FIxEd tO The feRrule.
onE Of THe semi-cylindrical suRfAce and The coNical surface fOrmed on the RIDGe serves As a pOSiTIve lens in the YZ-Plane.
the inclinaTIon angle (Xcex2) oF the ridgE at the tip END of the opTicAl fIbeR is SET sO that xcex2xe2x89xA71XC2x0. CoNvEntionaLly, To utiliZe a FieLd-eFfeCt Liquid cryStal dispLaY dEvIcE whEre thE Liquid crYsTalS aRe iN the tWIsted nEmatiC modE, nEmATic Liquid cRYsTALs of HiGh PosiTivE dIelecTric ANisOtropy aRe utilizeD. ThE InteRiOr SurfaceS of the plates cOnStituting tHe CelL which HOLds the liQuid crystal material are eACh unidiRecTionaLly rUbbed with A maTerial SucH As cottOn, and tHe plaTeS arE MOunteD SO tHat ThE rubbing diRECtiOns of ThE oppOsed plaTes are at 90.degree. to eaCH otHer. The moleculEs iMmedIATeLy aDJaCEnt To THe iNNEr surfaces of the Plates orieNt THeMselves in tHE ruBbIng direCtions, aNd the MOleculeS intermedIate the plAtEs foRM TheMselves intO a helix oF one-quartER turn. iT iS beliEveD that mInUte GroovEs are fORmeD by thE rubbiNg And thaT the lIqUid crystAl molecules fall into the gRooves With tHe mOlecular aXes PAraLlel to the DireCtion of the GroOveS. WherE thE RubbiNg diREcTioNS, as inDicaTEd, are at riGHt AngLES tO each other aND THe lIquid CrySTal celL is bEtween crossed polaRIzer plates, then, In thE ABseNce OF an eLeCtric field, lighT is TrANSmitted tHrOugh the systEm
 ferrule and an XZ-plane i s definedso th atthe  r idge  ofthe wedge-shap e d le ns lies in the XZ-plan e, th ew edge d  a nd le nsed op t ic a l  fi be rissu p po rtedtog ether w ith the fe rru le  so that the ri dge is inpar allel with a  gr inding  s urf a ce an d t herea fter t h e opti cal fiber  i s  tilte d , where b y  a  pai r of inclined sur f ac e s are formed o n theti p  e n d  of  aconical su rf ace o f  the op t ic a l fib e r and the fer rule so tha t  ea ch ofth e s u rfaces  hasan inc lination an gle(xcex1) w ith re s pect to a plane  perpe ndi cul ar t o  t he  XZ -p l ane ,  a ndt heridge is  f or med i ntoo n e of a  se mi-c ylind rical surface  an d ac oni cal s urfac e on  t he op ticalfiber  t ogether with th e co nical sur fac eofth e fer r ule by  th e g rinding .
The i n cli na t i o nof the generatrixof t he  cone of  the f e rr ul e  at theti p e nd o f the o ptic a lfiber is  mades ub st antiall yequalto  th e i nclin a tion  angle  a of th e inc l ined surfaces. The ferrule m a yb e  p r ovid edwith an ind ex d e term inin g  t hed irect ion i nw hi c h the ridge extends .The in dex m ay be formedby partlyc h a nging th e co l um n ar surface ofthe f errule int o  some sh ape.Alternat ively, th e index ma y b e i mpl eme n t ed  by providing a  mac hi ned par t f ixed to  th e f err ule .One of th e semi-c yl in dr ic alsurfa c e and th econ ic alsurfa c e form ed on  the  r id g e s erves a s  a p osit iv elens  in  t he YZ -pla n e.The inc linationang l e (x ce x2 ) of th e ridge at th etip end of  t heoptica l fiber is  set so that xcex2xe2x8 9 xa71xc2 x0.  Conv enti onally, t o u tilize  af ield-e ffectliqui dcry s t al di s p la y d ev ice wheret h e l iquid  c ryst als are  in the twisted ne m ati c mode, nemat icliqu i d  c rys t al s  of  h i ghp o sitive dielectr ic anisotr op y  a re utilize d . T he  interi or surf aceso f the p lates con stituting  t he c e l l w hich holds  the liq uid cryst a l mat e ri al ar e e ach un id ire ction ally r u bbe d wit h a ma te rial s uch a scotton,and the plates are moun ted so  that  th e rubbing  di r ect ions of t he o pposed pla tes  ar e at90. d egree . to ea cho ther.  The molecules im med i a te ly adjacent t o  th e inn ers urface s of  the plates orien t  themselves in  the r ubb ing dire ct ions, and themol ec u l es inter me diate the p lates fo rm thems elvesinto a  helixo f  o n e-quar tertur n. It isbel ie v ed that  m in u te gro oves  a re for med by ther u bbing and that t he li q u id cr y sta l mol ec ules fa l l in to the gro oves with t he mol ecul ar ax es para ll el tothe  d irection o f  the groo ves.Where t he  rub bin g dire ctio n s , asindi ca ted , are atr i gh t  a ng l esto e ach o th er a nd the li q uid crys tal cell is  b etw e e n cros s ed p olarizer p lat es, t h e n, in thea bsen c eo f anelectr ic fie ld, lig h t i stransmi tte d through t he system 
 ferrule_and an_XZ-plane is defined so_that the_ridge_of the_wedge-shaped_lens lies in_the XZ-plane, the_wedged and lensed optical_fiber is supported_together_with the ferrule so that the ridge is in parallel with a grinding surface_and_thereafter the_optical_fiber_is tilted, whereby a pair_of inclined surfaces are formed_on the_tip end of a conical surface of the_optical_fiber and the_ferrule so that each of the surfaces has an_inclination angle (xcex1) with respect to_a plane perpendicular_to_the_XZ-plane, and the ridge_is formed into one of a_semi-cylindrical surface and a conical surface_on the optical fiber together with the_conical surface of the ferrule by_the grinding.
The inclination of the_generatrix of_the cone of the ferrule_at the tip_end of_the optical fiber_is made substantially equal to the_inclination angle a_of the inclined surfaces.
The ferrule may_be_provided with an_index_determining_the direction_in which the_ridge_extends. The_index_may be formed by partly changing_the_columnar surface of the ferrule into some_shape. Alternatively, the index_may_be implemented by providing_a machined part fixed to_the ferrule.
One of the semi-cylindrical surface_and the_conical surface_formed on the ridge serves as a positive lens in the_YZ-plane.
The inclination angle (xcex2) of the_ridge at the tip_end of_the_optical fiber is_set_so that_xcex2xe2x89xa71xc2x0. Conventionally, to utilize a field-effect liquid_crystal display_device where the liquid crystals are_in the twisted nematic_mode,_nematic liquid crystals of high positive_dielectric anisotropy are utilized. The interior_surfaces of the plates constituting_the_cell_which holds the liquid crystal_material are each unidirectionally rubbed with_a material such_as cotton, and the plates are mounted_so_that the rubbing directions of the_opposed_plates are at 90.degree. to each_other._The_molecules immediately adjacent to the_inner surfaces of the plates orient_themselves in the rubbing directions, and the molecules intermediate_the plates form_themselves into a helix of_one-quarter_turn._It is believed that minute grooves are formed by the_rubbing and_that the liquid_crystal molecules fall into the grooves with the molecular axes_parallel to the direction of the grooves._Where the rubbing directions, as indicated, are at right angles to_each other and the liquid crystal cell is_between crossed polarizer plates, then, in the_absence of an electric_field,_light is transmitted through the system