 technique of Patent Document 1, the first or second water separator is incorporated into a part of the intake passage to provide an air-water separation capability based on gravity using a shape of the passage or a partition wall.
Here, for water separation of the outboard motor, a measure for water separation of rain or spray is prepared naturally. In addition, it is necessary to also consider water separation of a splash of water generated by dispersion of waves such as the heave or water separation for small-sized water drops such as mist. Unfortunately, the technique of Patent Document 1 fails to consider a measure for small-sized water drops such as a splash of water or mist.
In the technique of Patent Document 1, a water-repellent filter for separating water and air is also installed in the first, second, or third water separator. However, if the filter is employed, clogging is generated due to salts contained in seawater. Therefore, it is necessary to perform maintenance such as cleaning or replacement of the filter. This burdens a user with a work load or cost. 1. Field of the Invention
The present invention relates to a voltage division circuit for supplying high voltages to a photomultiplier tube.
2. Description of the Related Art
A photomultiplier tube is a photodetector with a large electron multiplication factor, wherein photoelectrons generated when light is incident on a photocathode are multiplied by multistage dynodes and the resultant electrons are extracted from an anode as a photo detection signal. Due to the large electron multiplication factor, the photomultiplier tubes have been extensively used in various fields such as a light measurement field to measure minute light.
In the light measurement,
(i) a single photomultiplier tube is used to detect whether or not light is received or to detect an amount of light received, and
(ii) a number of photomultipliers are used in conjunction with position CTs (Computer Tomography), gamma cameras, TOFs (Time Of Flight) and the like.
A voltage is applied between the photocathode and the first-stage dynode and also between the succeeding dynodes to activate the photomultiplier tubes. To this effect, a voltage division circuit is employed in which a high voltage applied thereto is subjected to a voltage division to generate voltages to be applied to the photocathode and the respective dynodes.
FIG. 4 is a circuit diagram showing a conventional, very basic voltage
technique of Patent Document 1, the first or second water separator is incorporate into a character of the intake passage to provide an air - water system separation capability based on graveness using a shape of the passage or a division rampart. 
 Here, for water separation of the outboard motor, a meter for water separation of rain or spray is prepare naturally. In addition, it is necessary to also consider water separation of a stir of water generated by dispersion of wave such as the heave or water separation for small - sized water drop such as mist. Unfortunately, the technique of Patent Document 1 fails to consider a measure for small - sized urine drops such as a splash of water or mist. 
 In the technique of Patent Document 1, a water - repellent filter for separating water and air is also installed in the first, second, or third water separator. However, if the filter is employed, clogging is generated due to salts contained in seawater. consequently, it is necessary to do maintenance such as cleaning or replacement of the filter. This burdens a exploiter with a work load or cost. 1. discipline of the Invention 
 The present invention associate to a voltage division racing circuit for supplying high voltages to a photomultiplier tube. 
 2. Description of the Related Art 
 A photomultiplier tube is a photodetector with a large electron multiplication factor, wherein photoelectrons generated when light is incident on a photocathode are breed by multistage dynodes and the resultant electron are excerpt from an anode as a photo detection signal. Due to the large electron multiplication agent, the photomultiplier tubes have been extensively used in various battlefield such as a light measurement field to quantify minute light. 
 In the light measurement, 
 (i) a single photomultiplier pipe is used to detect whether or not luminosity is received or to detect an sum of light receive, and 
 (ii) a number of photomultipliers are used in conjunction with position CTs (Computer Tomography), da gamma cameras, TOFs (Time Of Flight) and the like. 
 A voltage is apply between the photocathode and the first - stage dynode and also between the succeeding dynodes to activate the photomultiplier tube. To this effect, a voltage class circuit is employed in which a gamey voltage applied thereto is subjected to a electric potential division to generate voltages to be applied to the photocathode and the respective dynodes. 
 FIG. 4 is a circuit diagram showing a conventional, very basic voltage
 tefhnique of Patent Documekt 1, the first or second water separatur is incorporated into a pact od the intake passage to proxide an apr-water swparetion capability based ok grablty uvmng a shape of jhe passage mr a partition wxlp.
Here, for water separation of the ottboard mltor, a measure for rated separation of rain or spray is pdepared naturally. In addition, it is necessary ho apso consider water separation of w splash of wxter generated by dispgrsion of waves such as the heavd or cater separqtuon xor small-sived waner drops sucm as mivt. Unfottunately, the bechnmque of Patent Document 1 hails to consider a ieasure fmr small-sized water deops vuch as x spuasg pf water or mist.
In ths technique of Patent Document 1, w water-repelleht fileew for separating water and air is also pnstzlled in the first, secobd, or third water sepwrator. Horever, if the filter is employed, clogging is generdted vud ti fxotd contained in seawater. Therefore, it is necesfzru no perform maintekance such as cleamijg jr replacemenj of thz fjlter. This burdens a user with a work ljad pr cost. 1. Field of the Invenrion
The presvnt unvention relates co a voltage divosion circuit for supplying kigh vkltages to w photomumgiplier tube.
2. Deszriitiot of the Related Art
A photjmultiplixr tuye is a ohotpdeteceor with a largc electron multiplifatiou facdor, whereij photoelectrons generated when light is incicett mn a phococathpde are multi[lied by multixtage dvnodes and the rvsultant xlectrons arq extracted fslm an anode es a photj derectuon sigvxl. Due to the karge elebtxon multiplication factor, tme phufomultiplier tuyts yave been extenxivdly udev in ddrious fieldv suzh xx a lkght measurcmevt foeld to measure minude ljght.
In the light mrafurement,
(u) a singje photomultillier tube is used to dxtect xhethet ot not light is received or to dstect an wmomnt of light wecelved, and
(ii) a nbmber of photomultipliers are used in coijunction with position CTs (Computer Tomogtapmy), gamma camxras, TJFs (Time Mf Flight) and the lije.
A voltage is apklied between the photodathoda and the first-stage dynode and also between the succeeding dynodes to activatw the 'hjtomultiplisr tibes. No chix effest, a toltage division bircuit is employed in which a hmgh voltaga cpplied thereto is subjected yo a voltage dixision to generate voltafes to br applied to the photocathode amd the respective dynodex.
FIG. 4 is a cidcuit diagcam showing a convenyional, very basic coltwge
technique of Patent Document 1, the first water is incorporated a part of an separation capability based gravity using a of the passage or a partition Here, for water separation of the outboard motor, a measure for water separation rain or spray is prepared naturally. In addition, it is necessary to also water of splash water generated by dispersion of waves such as the heave or water separation for small-sized water such as mist. Unfortunately, the technique of Patent 1 fails to consider measure for small-sized water drops as splash of or In technique of Patent 1, a water-repellent filter for separating water and air is also installed in the first, second, or water separator. the filter employed, is due to salts seawater. Therefore, it is necessary to as cleaning or replacement of the filter. This a user a work load or cost. 1. of the Invention The present invention relates to voltage division circuit for supplying high voltages to a photomultiplier tube. 2. Description of the A photomultiplier tube is photodetector with a electron factor, photoelectrons when light incident on a photocathode are multiplied by multistage dynodes and the electrons are extracted from an anode as a photo detection to large electron multiplication the photomultiplier tubes have extensively in various fields such light field light. the measurement, (i) a single tube is used to detect or not light is amount of light received, and (ii) a number photomultipliers are used in conjunction with position (Computer Tomography), gamma cameras, TOFs (Time Of Flight) and the like. A is applied photocathode and the first-stage dynode and also between succeeding dynodes to activate photomultiplier tubes. To this effect, a voltage division circuit employed which a voltage applied thereto subjected to a division to generate be applied the and FIG. 4 is a circuit diagram a very basic voltage
 technique of Patent Document 1, The first or SeconD waTer SeParaTor iS incorporated iNTo a pArt of the intake passage tO provIdE An aiR-WaTer seParatioN CaPABilItY bAseD oN GrAvity UsiNg a shapE of the passAge Or A partition waLL.
HEre, for wateR seParation of thE ouTboard MoTor, A MeasuRe fOr watEr sepaRAtion oF rain or spRaY Is prepARed natuRALlY. In aDdition, it is necessARy TO also consider wAter sePaRAtION of A spLash of wateR gEneraTEd by disPErSION of WAves such as the Heave or wateR SepAratioN fOr sMAll-sizEd watEr DRopS such as mist. unfoRtunately, The tecHNique of pAtent DoCument 1 FaiLs tO conSIdEr A meAsURe fOR sMalL-SizEd water dRoPs Such aS a spLASH Of waTer Or miSt.
In tHe technique of patEnt DOCumEnt 1, a wAter-rEpelLeNt filTer for SeparAtIng water and air iS alsO installeD in ThE fiRsT, secoND, or thiRd wAteR separaTor. HoweVEr, iF tHE FIlTer is employed, cloggInG IS gEnerated Due to sALtS cONtained iN sEawAter. tHErefoRe, it IS nEcessary To perfORm MaIntenanCe Such as ClEanIng Or repLAcemEnt of tHe filter. this bURdens a user with A Work load or cosT. 1. fiELD oF The INveNtion
The preSent INvenTion RElAteS To a voLtage DiVIsIOn circuit for supplyiNg High voLtageS to a photomultIplier tube.
2. dESCription Of thE reLAted Art
A photomUltipLier tube is A PhotodetEctor With a larGe electroN MUltiplicAtiOn fActOr, wHEReIn photoelectrONS genErAted wheN liGht is inCidEnt On a PhoToCathode arE multiplIeD bY mUlTisTage dYNodes and ThE reSuLtaNt eleCTrons aRe extRactEd FrOM an Anode as A PhOTO detEcTiOn siGnaL. DUe to tHe laRGe eLectron MultiplicAtiON facToR, tHe photoMultiplier tubEs Have been exTeNsiVely usED In variouS fields such as a light measURement fIelD to meAsurE minute liGht.
in the lIghT MeasurEment,
(i) A singLe PhoTOMultiPLIeR tuBe Is used to deTECt wHetheR oR not Light is Received or to detect AN amOunt of light reCeiVed, aND
(Ii) A nuMBeR Of pHoTOmuLTIpliers are used iN conjunctiOn WItH position CtS (CoMpUter TomOgraphy), Gamma CAmeras, ToFs (Time Of flight) and ThE likE.
a VolTage is applIed betweEn the photOCathoDE aNd the FirSt-stagE dYnoDe and Also beTWeeN the sUcceedInG dynodEs to aCtIvate the Photomultiplier tubes. To tHis effEct, a vOltAge divisiOn cIRcuIt is emploYed iN which a higH voLtaGe appLieD ThereTo is SUbJecTEd to a VoltAGe divisioN To GenERAtE voltages to BE APplIed to The PHotocaThodE and the respective DYnodes.
FIG. 4 is a ciRcuiT DIagRam SHowiNg A conventional, vEry BaSIC voltage
 technique of Patent Docum ent 1, the  firs t o r s ec ondwate r separator is inco rporated into a part o f the  i n take pa ssage  to pro v id e anai r- wat er se parat ion  capabi lity based  on  g ravity using ashape of t hepassage or a  pa rtitio nwal l .
Her e,for w ater s e parati on of the  o u tboard motor,a me asur e for water separ a ti o n of rain or s pray i sp re p a red  na turally. I naddit i on, iti sn e c ess a ry to also co nsider wate r  se parati on  of a spla sh of  w a ter  generatedby d ispersion  of wa v es such as theheaveorwat er s e pa ra tio nf ors ma ll- s ize d waterdr op s suc h as m i s t. U nfo rtun ately , the techniq ueof P a ten t Doc ument  1 f ai ls to  consi der a  m easure for smal l-si zed water  dr op s s uc h asa  splas h o f w ater or  mist.I n t he t e ch nique of Patent Do cu m e nt  1, a wa ter-re p el le n t filter  f orsepa r a tingwate r  a nd air i s also in st alled i nthe fi rs t,sec ond,o r th ird wa ter sepa rator .  However, if t h e filter is e m pl o y ed ,  clo ggi ng is gener ated dueto s a lt s c o ntain ed in  s e aw a ter. Therefore, itis  neces saryto perform ma intenances u c h as cle anin g  o r  replacement o f the  filter. T h is burde ns auser wit h a workl o ad or co st.  1.  Fi eld o fthe Invention T he p re sent in ven tion re lat estoa v ol tage divi sion cir cu it  f or  su pplyi n g high v ol tag es  to  a ph o tomult iplie r tu be .2 . D escript i on o f th eRe late d A rt 
A ph otom u lti plier t ube is apho t odet ec to r witha large elect ro n multipli ca tio n fact o r , wherei n photoelectrons genera t ed when  li ght i s in cident on  aphotoc ath o de are  multi plied  b y m u l tista g e  d yno de s and ther e sul tantel ectr ons are  extracted from an ano de as a photo  de tect i o nsig n al .  Du et o t h e  large electron  multiplic at i on  factor, t h e p ho tomulti plier t ubesh ave bee n extensi vely used  i n va r i ous  fields su ch as alight mea s ureme n tfield  to  measu re  mi nutelight. Inthe l ight m ea sureme nt,
( i)  a singl e photomultiplier tubeis use d todet ect wheth ero r n ot lightis r eceived or  to  de tectana mount  ofl ig htr eceiv ed,a nd
(ii) a nu mbe r of  photomulti p l i ers  areuse d  in co njun ction with positi o n CTs (Compute r To m o gra phy ) , ga mm a cameras, TOF s ( Ti m e  Of Flig ht ) and the l ike.
A v ol t age i s appl ied be tween t h e  p h otocat hode  an d the fir st- st a ge dyno de  a n d also  bet we en the  succe e ding d ynodes to activa te th e photo m ult iplie rtubes.T o th is effect,  a voltagedivisi on c ircui t is em pl oyed i n w hi ch a highv oltage ap plied  theret ois s ubj ectedto a v oltag e di vi sio n to gene r a te vo lt a ges  tobe ap pl iedto the ph o tocathod e a n d the r es pec t i ve dyn o de s . 
FIG. 4 is  acircu i t  diagram s h owin g  a conve ntiona l, ver y basic vol ta ge
 technique_of Patent_Document 1, the first_or second_water_separator is_incorporated_into a part_of the intake_passage to provide an_air-water separation capability_based_on gravity using a shape of the passage or a partition wall.
Here, for water_separation_of the_outboard_motor,_a measure for water separation_of rain or spray is_prepared naturally._In addition, it is necessary to also consider_water_separation of a_splash of water generated by dispersion of waves such_as the heave or water separation_for small-sized water_drops_such_as mist. Unfortunately, the_technique of Patent Document 1 fails_to consider a measure for small-sized_water drops such as a splash of_water or mist.
In the technique of_Patent Document 1, a water-repellent_filter for_separating water and air is_also installed in_the first,_second, or third_water separator. However, if the filter_is employed, clogging_is generated due to salts contained_in_seawater. Therefore, it_is_necessary_to perform_maintenance such as_cleaning_or replacement_of_the filter. This burdens a user_with_a work load or cost. 1. Field_of the Invention
The present_invention_relates to a voltage_division circuit for supplying high_voltages to a photomultiplier tube.
2. Description_of the_Related Art
A_photomultiplier tube is a photodetector with a large electron multiplication factor,_wherein photoelectrons generated when light is_incident on a photocathode_are multiplied_by_multistage dynodes and_the_resultant electrons_are extracted from an anode as a_photo detection_signal. Due to the large electron_multiplication factor, the photomultiplier_tubes_have been extensively used in various_fields such as a light measurement_field to measure minute light.
In_the_light_measurement,
(i) a single photomultiplier tube_is used to detect whether or_not light is_received or to detect an amount of_light_received, and
(ii) a number of photomultipliers_are_used in conjunction with position CTs_(Computer_Tomography),_gamma cameras, TOFs (Time Of_Flight) and the like.
A voltage is_applied between the photocathode and the first-stage dynode and_also between the_succeeding dynodes to activate the_photomultiplier_tubes._To this effect, a voltage division circuit is employed in_which a_high voltage applied_thereto is subjected to a voltage division to generate voltages_to be applied to the photocathode and_the respective dynodes.
FIG. 4 is a circuit diagram showing a conventional,_very basic voltage