光电编码器英文资料.docx
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光电编码器英文资料.docx
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光电编码器英文资料
Patentapplicationtitle:
PHOTOELECTRICENCODEInventors:
HiroakiKawada HiroatsuMori
Agents:
RANKIN,HILL&CLARKLLP
Assignees:
Origin:
WILLOUGHBY,OHUS
IPC8Class:
AG01D5347FI
USPCClass:
Publicationdate:
02/10/2011
Patentapplicationnumber:
20110031382
Abstract:
Aphotoelectricencoderincludes:
ascale;adetectionhead;fibersthroughwhichlightthatistobeirradiatedonthescaleandlightreflectedbythescalepropagates;firstandsecondcableseachhavingaspaceinwhichthefibersarepartiallydisposed;andacasethatenclosesalightsourcethatsupplieslighttooneofthefibersandalight-sensitiveelementthatreceivesthereflectedlightpropagatingthroughtheothersofthefibersandconvertsthereceivedlightintoanelectricsignal.Thefirstcable,thesecondcable,andthecasearedisposedinthisorderinthedirectionofpropagationofthereflectedlight.Thepositionsofthefibersarefixedrelativetooneanotherinsidethefirstcableinthedirectionorthogonaltothedirectionoflengthofthefibersandvariablerelativetooneanotherinsidethesecondcableintheorthogonaldirection.
Claims:
1. Aphotoelectricencodercomprising:
ascalethathasadiffractiongratingformedatapredeterminedpitchinameasurementaxisdirection;adetectionheadthatirradiatesthescalewithlightandreceiveslightreflectedbythescale;apluralityoffibersthroughwhichthelightthatistobeirradiatedonthescaleandthelightreflectedbythescalepropagates;afirstcablethathasaninnerspaceinwhichthepluralityoffibersispartiallydisposed;asecondcablethathasaninnerspaceinwhichthepluralityoffibersispartiallydisposed;andaframeunitinsidewhichalightsourceandalight-sensitiveelementareprovided,thelightsourcesupplyinglighttothepluralityoffibersoratleastoneofthepluralityoffibers,thelight-sensitiveelementreceivingthereflectedlightpropagatingthroughthepluralityoffibersortheothersofthepluralityoffibersandconvertingthereceivedlightintoanelectricsignal,whereinthefirstcable,thesecondcable,andtheframeunitaredisposedinthisorderinadirectionofpropagationofthelightreflectedbythescalethroughthepluralityoffibersortheothersofthepluralityoffibers,thepluralityoffibersispartiallydisposedintheinnerspaceofthefirstcableinsuchamannerthatthepositionsofthefibersarefixedrelativetooneanotherinadirectionorthogonaltoadirectionoflengthofthefibers,andthepluralityoffibersispartiallydisposedintheinnerspaceofthesecondcableinsuchamannerthatthepositionsofthefibersarevariablerelativetooneanotherinthedirectionorthogonaltothedirectionofthelengthofthefibers.
2. Thephotoelectricencoderaccordingtoclaim1,whereinthepluralityoffibersispartiallydisposedintheinnerspaceofthesecondcableinsuchamannerthatpositionsofthefibersarerandomrelativetooneanotherinthedirectionorthogonaltothedirectionofthelengthofthefibers.
3. Thephotoelectricencoderaccordingtoclaim1,whereinthepluralityoffibersispartiallydisposedintheinnerspaceofthesecondcableinsuchamannerthateachofthefibershasslack.
4. Thephotoelectricencoderaccordingtoclaim1,whereinthepluralityoffibersispartiallydisposedintheinnerspaceofthefirstcableinsuchamannerthateachtwoofthefibersoneofwhichisdisposedadjacenttotheotherinthedirectionorthogonaltothedirectionofthelengthofthefibersareincontactwitheachother.
5. Thephotoelectricencoderaccordingtoclaim1,whereinaninsidediameterofthesecondcableislargerthananinsidediameterofthefirstcable.
6. Thephotoelectricencoderaccordingtoclaim1,whereinthesecondcableismoreflexiblethanthefirstcable.
7. Thephotoelectricencoderaccordingtoclaim1,whereinthesecondcablehasafirstconnectorprovidedatoneendinthedirectionofthelengthofthefibersandasecondconnectorprovidedattheotherendinthedirectionofthelengthofthefibers.
8. Thephotoelectricencoderaccordingtoclaim7,whereinthefirstcablehasaconnectorthatcanbecoupledtothefirstconnector;andtheframeunithasaconnectorthatcanbecoupledtothesecondconnector.
9. Thephotoelectricencoderaccordingtoclaim7,whereinthesecondcablecomprisesapluralityofcablepieces;eachofthecablepieceshasthefirstconnectorandthesecondconnector;thefirstconnectorcanbecoupledtothesecondconnector;andthefirstconnectorofonecablepieceofthesecondcableiscoupledtothesecondconnectorofanothercablepieceofthesecondcable.
10. Thephotoelectricencoderaccordingtoclaim1,whereinthepluralityoffiberscomprisesalightemissionfiberthroughwhichthelightthatistobeirradiatedonthescalepropagatesandapluralityoflightreceptionfibersthroughwhichthelightreflectedbythescalepropagates.
11. Thephotoelectricencoderaccordingtoclaim10furthercomprising:
athirdcablethatisprovidedbetweenthesecondcableandtheframeunitandhasaninnerspaceinwhichthelightemissionfiberisdisposed;andafourthcablethatisprovidedbetweenthesecondcableandtheframeunitandhasaninnerspaceinwhichthepluralityoflightreceptionfibersisdisposed.
12. Thephotoelectricencoderaccordingtoclaim1furthercomprising:
anopticalelementthatchangesadirectionofthelightthatisemittedfromthedetectionheadforirradiationonthescaleandchangesadirectionofthelightreflectedbythescale,whereinapositionoftheopticalelementrelativetoapositionofthedetectionheadisfixed.
Description:
TECHNICALFIELD
[0001]Thepresentinventionrelatestoaphotoelectricencoder.
BACKGROUND
[0002]Aphotoelectricencodergenerallyusesabundlefiber,whichisabundleoffibersfixedtooneanother.Aphotoelectricencoderofrelatedartincludesascale,alightemissionfiber,apluralityoflightreceptionfibers,andadetectionhead.Thescalehasadiffractiongratingformedatapredeterminedpitchinthedirectionofthemeasurementaxis.Thedetectionhead,whichcanchangeitsrelativepositionwithrespecttothescale,irradiatesthescalewithcoherentlight.Lightreflectedbythescaleentersthedetectionhead.Theoutgoingcoherentlightpropagatesthroughthelightemissionfiber.Theincomingreflectedlightpropagatesthroughthelightreceptionfibers.Thelightemissionfiberisdisposedatthecenteronadetectionplaneofthedetectionhead.Thelightreceptionfibersaredisposedaroundthelightemissionfiberonthedetectionplane.Thesystemofrelatedartfurtherincludesandaninterfaceunitthatincludesalightsource,alight-sensitiveelement,andasignalprocessingunit.Thelightsourcesuppliesalaserbeamtothelightemissionfiberinthedetectionhead.Thelight-sensitiveelementreceivesthereflectedlightpropagatingthroughthelightreceptionfibersandconvertsthereceivedlightintoanelectricsignal.Thesignalprocessingunitprocessesthesignaltomeasurearelativepositionalshiftduetothemovementofthedetectionhead,thescale,orboth.ExamplesoftherelatedartaredisclosedinthefollowingJapaneseUnexaminedPatentApplicationPublications:
Nos.2004-53605,2008-39602,and2007-232681.
[0003]However,tocarryoutremotemeasurementbyusingsuchaphotoelectricencoderofrelatedartwithacertaindistancebetweenthedetectionheadandtheinterface(e.g.,20morlonger),itisnecessarytoextendthepluralityoffibers.Therefore,itisnecessarytomanufacturealongbundlefiber,whichisnoteasy.Itishardtosaythataphotoelectricencoderofrelatedartofferseasinessinhandling,usability,andworkefficiencysatisfactorily.Moreover,inthephotoelectricencoderofrelatedart,itisnecessarytoinsertthebundlefiberintotheinterfaceandbranchthepluralityoffibersintothelightemissionfiberandthelightreceptionfibers.Suchastructurerequirescomponentsthatareusedforunbundlingthebundlefiberinsidetheinterface.Thus,thereductioninthesizeoftheinterfaceislimited.
SUMMARY
[0004]Thefollowingpresentsasimplifiedsummaryoftheinventioninordertoprovideabasicunderstandingofsomeaspectsoftheinvention.Thissummaryisnotanextensiveoverviewoftheinvention.Itisintendedtoneitheridentifykeyorcriticalelementsoftheinventionnordelineatethescopeoftheinvention.Itssolepurposeistopresentsomeconceptsoftheinventioninasimplifiedformasapreludetothemoredetaileddescriptionthatispresentedlater.
[0005]Anadvantageofsomeaspectsoftheinventionistoprovideaphotoelectricencoderthatcansolvetheaboveproblems,thoughnotlimitedthereto.Acombinationofconstituentelementsand/orfeaturesthatarerecitedinanindependentclaimappendedheretoofferssuchanadvantage.Preferredmodesarerecitedindependentclaimsappendedhereto.
[0006]Aphotoelectricencoderaccordingtoanaspectoftheinventionincludesascale,adetectionhead,apluralityoffibers,firstandsecondcables,andaframeunit.Thescalehasadiffractiongratingformedatapredeterminedpitchinameasurementaxisdirection.Thedetectionheadirradiatesthescalewithlightandreceiveslightreflectedbythescale.Thelightthatistobeirradiatedonthescaleandthelightreflectedbythescalepropagatesthroughthepluralityoffibers.Eachofthefirstandsecondcableshasaninnerspaceinwhichthepluralityoffibersispartiallydisposed.Alightsourceandalight-sensitiveelementareprovided
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