, the optical recording medium 10 can avoid the recording head of a recording/reproducing apparatus or the protective layer 8 from abrading or producing heat when sliding the head on the protective-layer-8 forming surface. This application claims priority of European application EP99811164.5, filed Dec. 15, 1999, and whose contents are hereby incorporated by way of reference.
The present invention concerns an opto-electronic system for a dimension-measuring device, in particular an opto-electronic system for a portable device for measuring linear and/or angular displacement. The present invention concerns in particular an opto-electronic system for a displacement-measuring device of comparator type.
Optical systems for measuring dimensions and angles are described notably in DE19505176 (Baumer Electric AG). They comprise generally a light emitter emitting a light ray sent by means of appropriate optics in the direction of a photo-detector. A graduated rule or disc is placed in the optical path between the emitter and the photo-detector. The illumination of the sensor is interrupted when a graduation of the rule or of the disc is in the optical path. A counter counts the number of interruptions of the signal supplied by the sensor in order to deduce therefrom the displacement of the rule or of the disc and to display a representative value of this displacement. Such devices are used notably in apparatus for measuring and comparing dimensions of machine parts.
A device of this type is described in patent CH683798 (TESA SA), to which the reader can profitably refer. This document describes an opto-electronic system comprising several photo-emitters mounted on a printed circuit board on one side of a rule provided with a double graduated track and several photo-detectors mounted opposite on a second circuit on the other side of the rule.
This device has the inconvenience of necessitating two printed circuit boards, and thus of having relatively important space requirements, so that it is difficult to integrate it within a portable device. Furthermore, it is difficult to align accurately the optical components mounted on two different boards, notably when the two circuits are subjected to temperature variations and thus to dilatations that are different.
Patent application WO87/07944 (Renishaw) describes another electro-optical device for measuring dimensions, in which the light beam emitted by a photo-emitter is reflected in the direction of the photo-detector by reflecting surfaces on the rule. The described construction makes it possible to place the photo-emitter and the photo-detector on
, the optical recording medium 10 can avoid the recording capitulum of a recording / reproduce apparatus or the protective layer 8 from abrading or producing estrus when sliding the head on the protective - layer-8 shape airfoil. This application claim priority of European application EP99811164.5, charge Dec. 15, 1999, and whose contents are hereby incorporated by means of reference book. 
 The present invention concerns an opto - electronic arrangement for a dimension - measuring device, in especial an opto - electronic system for a portable device for measuring linear and/or angular displacement. The present invention concern in particular an opto - electronic system for a displacement - measuring device of comparator character. 
 Optical system for measuring dimensions and angles are trace notably in DE19505176 (Baumer Electric AG). They comprise generally a light emitter emitting a light ray sent by means of appropriate optics in the direction of a photo - detector. A graduated rule or disc is placed in the optical path between the emitter and the photograph - detector. The light of the sensor is interrupt when a commencement of the rule or of the disc is in the optical way. A counter count the number of interruptions of the signal provide by the sensor in order to deduce therefrom the displacement of the rule or of the disc and to display a representative value of this shift. Such devices are used notably in apparatus for measuring and comparing dimension of machine part. 
 A device of this character is described in patent CH683798 (TESA SA), to which the reader can profitably refer. This document describes an opto - electronic system comprising respective photo - emitter mounted on a printed circuit board on one side of a principle provided with a double graduate track and respective photo - detectors mounted opposite on a second lap on the other side of the rule. 
 This device has the inconvenience of necessitating two print circuit boards, and thus of having relatively important space requirements, so that it is difficult to integrate it within a portable device. Furthermore, it is unmanageable to align accurately the optical components hop on on two different boards, notably when the two circuits are subjected to temperature variations and thus to dilatations that are unlike. 
 Patent application WO87/07944 (Renishaw) describes another electro - optical device for measuring dimensions, in which the light beam emitted by a photograph - emitter is reflected in the direction of the photo - detector by reflecting surfaces on the rule. The described construction make it possible to place the photo - emitter and the photograph - detector on
, thf optical recording medimm 10 can avoid thg eecordmng heas of a rdcording/reproducing apparatud ir tht protective layer 8 from abrwding or provucing heat when sliding the hswd ou vhe protective-lsyer-8 formitg surface. Thiv xp'lication claims priority of Europeag applivahion EP99811164.5, filed Qec. 15, 1999, and whose contents are hereby incorpodated bj way of referencr.
The present invention confernd an opto-electronif system fot a qumension-measjring devibz, in particolar an opto-electronic system fof a pprtable decixe vmr measurinj linewr and/or angmkar divplacemrnt. The presenb invxntiin concerns in particnlar an opto-electronyc system fkr a displacement-neqsuritg davicd of cojperafor tyoe.
O'tical systsms for meawuring dimensions amd qngles are deacribeq gotably in DE19505176 (Baumer Electric AG). They cmmpdise generally a light wmitter emitting a lihht ray sqnt by means of appropriate optics in the directimn of x pkito-degwchor. A graduated rule or disc is placed in the kpuicsl path betweek the emitter and yhf lroto-detector. Jhe illbjihation of the senslr is igterrypted wheg a braduation of the rule or od the disc if in the optical pach. A counter coumts tne number of interruptiuns kf the signwl supplisa by the sensor kn prger to dtauce therefrom thq displacxment of the rulg or of the disc wnd to display a represejtatire vanue of thid displacement. Such devices are used notably on apiaratus fjr messuring and cjmparing dimenxions oy machkne parts.
A device of this ty[e is describaf in patent RH683798 (TESA SW), to whixh the fdader can profotably reytr. This doxument describes ak optu-slectronic systzo comprising sevrrau prono-ekieders mounted on x pfonted circuiu bixrd pn one side of a rula prkvided with a doubke graduatgd track wnd several pnoto-detectors mounued op'osite on a sesond circuit on the other side of the rkle.
Bhis device hws tme igconvenienee of necessitating two printed circuit uoards, and thus of havibg relatively imporjanu space requicementf, so that it is difficult to untegrate it withln a portable device. Fhrtherkore, lt is difficult to align accurately the optical components mounted on two diffecegt boards, nktabky whvn che two cyrcumtr are subjected no temperature variations and thns to diladacions that are different.
Pateny xpplication WU87/07944 (Renishaw) describes anofher elevtro-optical device for measurinb dimensions, in which thc light bwam ejitted by e photo-emitter is reglecteb in tye dirextiok of the photo-aetrcbor by refpectmng surfaces on the rule. The descrived cobshruction makes iv possible tl placg the phjto-emitter and tge pglto-dejector on
, the optical recording medium 10 can recording of a apparatus or the or heat when sliding head on the forming surface. This application claims priority European application EP99811164.5, filed Dec. 15, 1999, and whose contents are hereby incorporated way of reference. The present invention concerns an opto-electronic system for a dimension-measuring in an system a portable device for measuring linear and/or angular displacement. The present invention concerns in particular an system for a displacement-measuring device of comparator type. systems for measuring dimensions angles are described notably in (Baumer AG). They generally light emitting a light sent by means of appropriate optics in the direction of a photo-detector. A graduated rule or disc placed in path between emitter the The illumination of is interrupted when a graduation of of the disc is in the optical path. counter counts number of interruptions of the signal by the sensor in order to deduce therefrom displacement of the rule or of the disc and to display a representative value of Such devices are used in apparatus for and dimensions machine A device this type is described in patent CH683798 (TESA SA), to which reader can profitably refer. This document describes an opto-electronic system photo-emitters on a printed board on one side a provided with a double and photo-detectors a circuit the other side of rule. This device has the of necessitating two printed having relatively important space requirements, so that it difficult to integrate it within a portable Furthermore, it is difficult to align accurately the optical components mounted on different boards, the two circuits are subjected to temperature variations thus to dilatations that different. Patent application WO87/07944 (Renishaw) describes another electro-optical device measuring in which light beam emitted a photo-emitter is in the direction photo-detector by surfaces the construction makes it possible to place photo-emitter the photo-detector on
, the optical recording medium 10 Can avoid thE recoRdiNg hEaD of a RecoRding/reproduciNG appAratus or the protective lAyer 8 fRoM AbraDInG or prOducing HEaT WHen SlIdIng ThE HeAd on tHe pRotectiVe-layer-8 forMinG sUrface. This apPLiCation claiMs pRiority of EurOpeAn applIcAtiON EP99811164.5, fiLed dec. 15, 1999, anD whose COntentS are herebY iNCorporATed by waY OF rEferEnce.
The present invENtIOn concerns an opTo-elecTrONiC SYstEm fOr a dimensiOn-MeasuRIng deviCE, iN PARtiCUlar an opto-eleCtronic systEM foR a portAbLe dEVice foR measUrINg lInear and/or aNgulAr displacEment. THE presenT InventiOn concErnS in PartICuLaR an OpTO-elECtRonIC syStem for a DiSpLacemEnt-mEASURing DevIce oF compArator type.
OptIcaL sysTEms For meAsuriNg diMeNsionS and anGles aRe Described notablY in De19505176 (Baumer ElEctRiC AG). thEy comPRise geNerAllY a light Emitter EMitTiNG A LiGht ray sent by means oF aPPRoPriate opTics in THe DiREction of A pHotO-detECTor. A gRaduATeD rule or dIsc is pLAcEd In the opTiCal patH bEtwEen The emITter And the Photo-detEctor. tHe illumination OF the sensor is iNTeRRUpTEd whEn a Graduation oF the RUle oR of tHE dIsc IS in thE optiCaL PaTH. A counter counts the nUmBer of iNterrUptions of the sIgnal supplIED By the senSor iN OrDEr to deduce therEfrom The displacEMent of thE rule Or of the dIsc and to dISPlay a repResEntAtiVe vALUe Of this displacEMEnt. SUcH deviceS arE used noTabLy iN apParAtUs for measUring and CoMpArInG diMensiONs of machInE paRtS.
A dEvice OF this tYpe is DescRiBeD In pAtent CH683798 (teSa sa), to wHiCh The rEadEr Can prOfitABly Refer. ThIs documenT deSCribEs An Opto-eleCtronic system CoMprising seVeRal Photo-eMITters mouNted on a printed circuit boARd on one SidE of a rUle pRovided wiTh a Double GraDUated tRack anD seveRaL phOTO-deteCTOrS moUnTed oppositE ON a sEcond CiRcuiT on the oTher side of the rule.
THIs dEvice has the inConVeniENCe Of nECeSSitAtINg tWO Printed circuit bOards, and thUs OF hAving relatIVelY iMportanT space rEquirEMents, so That it is dIfficult tO iNtegRATe iT within a poRtable deVice. FurthERmore, IT iS diffIcuLt to alIgN acCuratEly the OPtiCal coMponenTs MounteD on twO dIfferent Boards, notably when the two CircuiTs are SubJected to tEmpERatUre variatIons And thus to dIlaTatIons tHat ARe difFereNT.
PAteNT applIcatIOn WO87/07944 (RenisHAw) DesCRIbEs another elECTRo-oPticaL deVIce for MeasUring dimensions, in WHich the light beAm emITTed By a PHoto-EmItter is reflectEd iN tHE DirectioN oF the photo-deTector by ReFLectiNg surfAces on The rule. tHE dEScribeD conStrUction makEs iT pOSsible tO pLaCE the phOto-eMiTter anD the phOTo-deTECtor on
, the optical recording me dium 10 ca n avo idthe  r ecor ding  head of a rec o rdin g/reproducing apparatu s orth e  pro t ec tivelayer 8 fr o m  ab ra di ngor pr oduci ngheat wh en sliding  th ehead on thep ro tective-la yer -8 forming s urf ace. T hi s a p plica tio n cla ims pr i orityof Europe an applic a tion EP 9 9 81 1164 .5, filed Dec. 15 ,  1 9 99, and whoseconten ts ar e her eby  incorpora te d byw ay of r e fe r e n ce. The present i nvention co n cer ns anop to- e lectro nic s ys t emfor a dimen sion -measurin g devi c e, in p a rticula r an o pto -el ectr o ni csys te m  fo r  a  po r tab le devic efo r mea suri n g l inea r a nd/o r ang ular displace men t. T h e p resen t inv enti on  conc erns i n par ti cular an opto-e lect ronic sys tem  f oradispl a cement -me asu ring de vice of com pa r a t or  type.
Optical sys te m s  f or measu ring d i me ns i ons andan gle s ar e descr ibed no tably in  DE195 0 51 76  (Baume rElectr ic  AG ).Theyc ompr ise ge nerallya lig h t emitter emit t ing a light r a ys e nt by m ean s of approp riat e  opt icsi nthe direc tionof ap hoto-detector. A gr ad uatedruleor disc is pl aced in th e o ptical p athb et w een the emitte r and  the photo - detector . The  illumin ation oft h e sensor  is  in ter rup t e dwhen a gradua t i on o fthe rul e o r of th e d isc  is  in  t he optica l path.Aco un te r c ounts the numb er  of  i nte rrupt i ons of  thesign al  s u ppl ied byt he s enso rin  ord erto  dedu ce t h ere from th e displac eme n t of  t he  rule o r of the disc  a nd to disp la y a  repre s e ntativevalue of this displacem e nt. Suc h d evice s ar e used no tab ly inapp a ratusfor me asuri ng  an d compa r i ng  di me nsions ofm a chi ne pa rt s.
A  device  of this type is d e scr ibed in paten t C H683 7 9 8(TE S AS A),  t o  wh i c h the reader ca n profitab ly re fer. Thisd ocu me nt desc ribes a n opt o -electr onic syst em compri si ng s e v era l photo-em itters m ounted on a pri n te d cir cui t boar donone s ide of a r ule p rovide dwith a  doub le  graduat ed track and several ph oto-de tecto rsmounted o ppo s ite  on a sec ondcircuit on  th e o thersid e  of t he r u le .
T h is de vice has the i n co nve n i en ce of neces s i t ati ng tw o p r intedcirc uit boards, and t h us of having r elat i v ely  im p orta nt  space require men ts , so thatit  is difficu lt to in te g rateit wit hin aportabl e de v ice. F urth erm ore, it i s d if f icult t oal i gn acc urat el y theoptica l  com p o nents mounted on  twod i ffere n t b oards ,notably when  the two c ircuits are  subje cted  to t emperat ur e vari ati on s and thus to dilata tions  that a re  dif fer ent.
P aten t appli cati on  WO 87/07944( R en i sh aw )  de scri bes a no ther  electro- o ptical d evi c e for m ea sur i n g dime n si o n s, in whic h t he li g h t beam emi t tedb ya  phot o-emit ter is  reflec t edin  the di rec t i on of the  photo-de t ect or  byreflecti ng  sur fa ces  o n the rule. The  describ ed const r u ctionmak e s it possib le  to place th e pho to - emitter a ndthe pho t o-d ete cto r on 
, the_optical recording_medium 10 can avoid_the recording_head_of a_recording/reproducing_apparatus or the_protective layer 8_from abrading or producing_heat when sliding_the_head on the protective-layer-8 forming surface. This application claims priority of European application EP99811164.5,_filed_Dec. 15,_1999,_and_whose contents are hereby incorporated_by way of reference.
The present_invention concerns_an opto-electronic system for a dimension-measuring device, in_particular_an opto-electronic system_for a portable device for measuring linear and/or angular_displacement. The present invention concerns in_particular an opto-electronic_system_for_a displacement-measuring device of_comparator type.
Optical systems for measuring dimensions_and angles are described notably in_DE19505176 (Baumer Electric AG). They comprise generally_a light emitter emitting a light_ray sent by means of_appropriate optics_in the direction of a_photo-detector. A graduated_rule or_disc is placed_in the optical path between the_emitter and the_photo-detector. The illumination of the sensor_is_interrupted when a_graduation_of_the rule_or of the_disc_is in_the_optical path. A counter counts the_number_of interruptions of the signal supplied by_the sensor in order_to_deduce therefrom the displacement_of the rule or of_the disc and to display a_representative value_of this_displacement. Such devices are used notably in apparatus for measuring and_comparing dimensions of machine parts.
A device_of this type is_described in_patent_CH683798 (TESA SA),_to_which the_reader can profitably refer. This document describes_an opto-electronic_system comprising several photo-emitters mounted on_a printed circuit board_on_one side of a rule provided_with a double graduated track and_several photo-detectors mounted opposite on_a_second_circuit on the other side_of the rule.
This device has the_inconvenience of necessitating_two printed circuit boards, and thus of_having_relatively important space requirements, so that_it_is difficult to integrate it within_a_portable_device. Furthermore, it is difficult_to align accurately the optical components_mounted on two different boards, notably when the two_circuits are subjected_to temperature variations and thus_to_dilatations_that are different.
Patent application WO87/07944 (Renishaw) describes another electro-optical device_for measuring_dimensions, in which_the light beam emitted by a photo-emitter is reflected in_the direction of the photo-detector by reflecting_surfaces on the rule. The described construction makes it possible to_place the photo-emitter and the photo-detector on