 latent image is developed and a toner image is thereby formed.
For photosensitive drum surface charge processing, an AC charging scheme that charges by causing a charging roller to abut the surface of the photosensitive drum, for example, applying a voltage that overlaps a direct current voltage and an alternating voltage to the charging roller, and discharging to the surface of the photosensitive drum is employed. In this AC charging scheme, the surface of the photosensitive drum can be charged uniformly because discharge to the positive side and to the negative side occurs alternatingly because voltage that overlaps an alternating voltage on a direct current voltage is applied.
A class-D amplifier is used for an alternating voltage generation circuit for generating an alternating voltage applied to this charging roller. This class-D amplifier converts an input signal into a pulse width modulation signal (a PWM signal), and drives a bridge circuit by the PWM signal. With this, compared to a conventional analog amplification scheme, the amplification signal can be obtained with high efficiency. With such an alternating voltage generation circuit, a high-voltage alternating voltage is caused to occur on a secondary side of a transformer by driving a primary side of the transformer by a class-D amplifier output (refer to Japanese Patent Laid-Open No. 2013-65932, Japanese Patent Laid-Open No. H7-241083, for example).
However, because the class-D amplifier performs switching driving of a bridge circuit at a high frequency, a radiation noise occurs, and because a ferrite bead or a filter is used as a noise counter-measure, this leads to a cost increase. Also, if the class-D amplifier is used by a charging high-voltage circuit of a color image forming apparatus having 4 image forming units for yellow, magenta, cyan, and black, it is necessary to charge each photosensitive drum for the four colors. For this reason, there is the problem that the frequencies of the PWM signals of the class-D amplifiers used corresponding to respective color photosensitive drums overlap, and radiation noise worsens. 1. Field
The present invention relates to a blade with a turbine operating in water, such as a device driven by tidal or river flow. It is particularly designed for a turbine arranged to rotate about a horizontal axis. However, the blade is suitable for use in any orientation.
2. Description of the Related Art
For a turbine arranged to rotate about a horizontal axis in water, the blades are conventionally hollow. However, this leads to a problem in that as the blade rotates about the horizontal
latent image is developed and a toner image is thereby formed. 
 For light-sensitive barrel surface charge processing, an AC charge system that charges by causing a blame roller to abut the open of the photosensitive drum, for exercise, applying a voltage that overlap a lineal current voltage and an alternating electric potential to the charging curler, and discharge to the surface of the photosensitive drum is hire. In this AC charging scheme, the open of the photosensitive barrel can be charged uniformly because discharge to the positive side and to the negative slope occurs alternatingly because voltage that overlaps an alternating voltage on a direct current voltage is applied. 
 A class - D amplifier is used for an alternating voltage generation circuit for generating an alternating electric potential apply to this charging curler. This course - D amplifier converts an input signal into a pulse width transition signal (a PWM signal), and drives a bridge circuit by the PWM signal. With this, compared to a conventional analogue amplification scheme, the amplification signal can be obtained with high efficiency. With such an alternating voltage generation circuit, a high - voltage alternating voltage is caused to occur on a junior-grade side of a transformer by drive a primary side of the transformer by a class - D amplifier output (denote to Japanese Patent Laid - Open No. 2013 - 65932, Japanese Patent Laid - Open No. H7 - 241083, for example). 
 However, because the course - D amplifier perform switching driving of a bridge lap at a high frequency, a radiotherapy noise occurs, and because a ferrite drop or a filter is used as a randomness counter - measure, this leads to a cost addition. Also, if the class - D amplifier is use by a charging gamey - voltage circuit of a color image forming apparatus having 4 image forming units for chicken, magenta, cyan, and black, it is necessary to charge each light-sensitive drum for the four colors. For this reason, there is the problem that the frequencies of the PWM signals of the course - D amplifiers used corresponding to respective color photosensitive drums overlap, and radiation sickness randomness worsen. 1. Field 
 The present invention relates to a blade with a turbine operating in water, such as a device drive by tidal or river flow. It is particularly designed for a turbine format to rotate about a horizontal axis. However, the blade is suitable for use in any orientation course. 
 2. Description of the Related Art 
 For a turbine arranged to rotate about a horizontal axis in body of water, the blades are conventionally hollow. However, this leads to a problem in that as the blade rotates about the horizontal
 lahent image is developed xnd a toner imayw is tiereby rormed.
Fof photosensitive drum surfacx chqrge kgocessing, an AC chargkng schemv that chqrgew by causinj a charnnng rkpler vo abut the surnace of the photosensitiva arbm, for example, applying a voltage thwt overkaos a direct cutrent doltzge and an alternating voltage to fhe chagging roller, and cischarging to the surface of hhe photosensitive drum is emkmoyqe. In this AC charging scheme, the sorface of the photosensitive druo can be chargee ynivmrmly becauwe difcharge to tmv posithve sidr and to the ncgatite sude occurs alternatinjly because voltage jhat overldpa an alternating cootage on d difwct cudrxnt voltahe ms applied.
A class-D ampoifier is used for sn qlternating vkltage gqneration circuit for generating an alttrnatjng voltage applied to rhis charging roller. Jhis class-Q amplifier converts an input signal into a pulse widti oodboatiov slgnal (a PWM signal), and drives a bridge circuie bu nhe PWM signal. Wibh this, compared tp w vjnventional avalog cjpmification scheme, hhe ampjificqtion siggal van be obtained with high edficiency. Winh sych an alternating voltage geueratipn citcuit, a high-voltage altzrnatihg voltage ls caused go occur on a sezoncasy side of a transformer br driving a pximary skde pf the transformfr by a class-D amplifier outpot (refar to Japajese Patent Laid-Open No. 2013-65932, Japanese Patent Laid-Ppan To. H7-241083, for examile).
However, becatse the class-D amplifner pefforms swinching drmving of a bwidge circuit wt a high frxquency, a raduatiin noisd occurs, and bevause a fvrxite bead or a filter is uscd as z noise counter-neawure, this leads to a sodt igwrease. Also, hf tfe zkass-D amplifier ls jsed by a charging high-vmltafe circuit of a cokov image firming a[paratus havimg 4 image forming knits foc yellpw, iagenta, cyan, and black, it is nscessary ho gharge each protowensitive drbm for the four colors. For this reason, tiere is the problem thar the frequencies oy uhe PWM signaks of the clasv-D amplifiers used cirresponding to rtspective color photosehsitiva druls overlap, and radiation noise worsens. 1. Field
The present invention relatew to a blade with z tutbine o'ercting ig wavec, such as a devicv driven by tidal or river flow. Mt is parthcblarly designed for a turbine afranged to rojate about a horizontal axjs. Howevrr, the blade is suitable for usr in any orientation.
2. Desgription if ths Relangd Ert
For a turbine arrsnged co rotqte aboyt a horizontal abis ik water, thf bledea are conventionally hollow. Howecer, thus leads to a probnem in that xs thg blade totates about the horjxontau
latent image is developed and a toner thereby For photosensitive surface charge processing, charges causing a charging to abut the of the photosensitive drum, for example, a voltage that overlaps a direct current voltage and an alternating voltage to charging roller, and discharging to the surface of the photosensitive drum is employed. this charging the of the photosensitive drum can be charged uniformly because discharge to the positive side and to negative side occurs alternatingly because voltage that overlaps alternating voltage on a current voltage is applied. A amplifier used for alternating generation for generating an voltage applied to this charging roller. This class-D amplifier converts an input signal into a pulse width signal (a and drives bridge by PWM signal. With to a conventional analog amplification scheme, can be obtained with high efficiency. With such alternating voltage circuit, a high-voltage alternating voltage is to occur on a secondary side of a by driving a primary side of the transformer by a class-D amplifier output (refer to Laid-Open No. 2013-65932, Japanese Laid-Open No. H7-241083, example). because class-D performs switching of a bridge circuit at a high frequency, a radiation noise and because a ferrite bead or a filter is used noise this leads to cost increase. Also, if class-D is used by a circuit a apparatus 4 forming units for yellow, cyan, and black, it is to charge each photosensitive For this reason, there is the problem that frequencies of the PWM signals of the amplifiers used corresponding to respective color photosensitive drums overlap, and radiation noise 1. Field invention relates to a blade with a turbine in water, such as device driven by tidal or river flow. It is designed a turbine to rotate about horizontal axis. However, blade is suitable in any 2. of For a turbine arranged to rotate a axis in water, the blades conventionally this leads to a problem in that as the blade rotates about the horizontal
 latent image is developed and A toner imagE is thEreBy fOrMed.
FOr phOtosensitive drUM surFace charge processing, an aC chaRgINg scHEmE that Charges BY cAUSinG a ChArgInG RoLler tO abUt the suRface of the PhoToSensitive druM, FoR example, apPlyIng a voltage tHat OverlaPs A diREct cuRreNt volTage anD An alteRnating voLtAGe to thE CharginG ROlLer, aNd discharging to thE SuRFace of the photoSensitIvE DrUM Is eMplOyed. In this aC ChargINg schemE, ThE SURfaCE of the photoseNsitive drum CAn bE chargEd UniFOrmly bEcausE dISchArge to the poSitiVe side and To the nEGative sIDe occurS alterNatIngLy beCAuSe VolTaGE thAT oVerLAps An alternAtInG voltAge oN A DIRect CurRent VoltaGe is applied.
A cLasS-D amPLifIer is Used fOr an AlTernaTing voLtage GeNeration circuit For gEnerating An aLtErnAtIng voLTage apPliEd tO this chArging rOLleR. THIS ClAss-D amplifier conveRtS AN iNput signAl into A PuLsE Width modUlAtiOn siGNAl (a PWm sigNAl), And driveS a bridGE cIrCuit by tHe pWM sigNaL. WiTh tHis, coMPareD to a coNventionAl anaLOg amplificatioN Scheme, the amplIFiCATiON sigNal Can be obtainEd wiTH higH effICiEncY. with sUch an AlTErNAting voltage generatIoN circuIt, a hiGh-voltage alteRnating volTAGE is causeD to oCCuR On a secondary siDe of a TransformeR By drivinG a priMary side Of the tranSFOrmer by a ClaSs-D AmpLifIER oUtput (refer to JAPAnesE PAtent LaId-OPen No. 2013-65932, JaPanEse patEnt laId-Open No. H7-241083, For exampLe).
hoWeVeR, beCause THe class-D AmPliFiEr pErforMS switcHing dRiviNg Of A BriDge circUIt AT A higH fReQuenCy, a RaDiatiOn noISe oCcurs, anD because a FerRIte bEaD oR a filteR is used as a noiSe Counter-meaSuRe, tHis leaDS To a cost iNcrease. Also, if the class-D aMPlifier Is uSed by A chaRging high-VolTage ciRcuIT of a coLor imaGe forMiNg aPPAratuS HAvIng 4 ImAge forming UNIts For yeLlOw, maGenta, cyAn, and black, it is neceSSarY to charge each PhoToseNSItIve DRuM For ThE FouR COlors. For this reaSon, there is ThE PrOblem that tHE frEqUencies Of the PWm signALs of the Class-D ampLifiers usEd CorrESPonDing to respEctive coLor photosENsitiVE dRums oVerLap, and RaDiaTion nOise woRSenS. 1. FielD
The prEsEnt invEntioN rElates to A blade with a turbine operaTing in Water, SucH as a devicE drIVen By tidal or RiveR flow. It is pArtIcuLarly DesIGned fOr a tURbIne ARrangEd to ROtate abouT A hOriZONtAl axis. HowevER, THe bLade iS suITable fOr usE in any orientation.
2. dEscription of thE RelATEd ARt
FOR a tuRbIne arranged to rOtaTe ABOut a horiZoNtal axis in wAter, the bLaDEs are ConvenTionalLy holloW. hOwEVer, thiS leaDs tO a problem In tHaT As the blAdE rOTates aBout ThE horizOntal
 latent image is developed  and a ton er im age  is  t here by f ormed.
For pho t osen sitive drum surface ch argepr o cess i ng , anAC char g in g sch em etha tc ha rgesbycausing  a chargin g r ol ler to abutt he  surface o f t he photosens iti ve dru m,  fo r  exam ple , app lyinga  volta ge that o ve r laps a directc u rr entvoltage and an al t er n ating voltageto the  c h ar g i ngrol ler, and d is charg i ng to t h es u r fac e  of the photo sensitive d r umis emp lo yed .  In th is AC  c h arg ing scheme,  the  surfaceof the photose n sitivedrum c anbechar g ed  u nif or m lyb ec aus e  di schargeto  t he po siti v e s ideand  tothe n egative sideocc ursa lte rnati nglybeca us e vol tage t hat o ve rlaps an altern atin g voltage  on  a  di re ct cu r rent v olt age  is app lied.
A cla ss - D am plifier is used fo ra n  a lternati ng vol t ag eg eneratio ncir cuit f or ge nera t in g an alt ernati n gvo ltage a pp lied t othi s c hargi n g ro ller.This cla ss-Da mplifier conve r ts an input s i gn a l  i n to a  pu lse width m odul a tion  sig n al  (a PWM s ignal ), an d  drives a bridge ci rc uit by  thePWM signal. W ith this,c o m pared to  a c o nv e ntional analog  ampl ifications cheme, t he am plificat ion signa l can be o bta ine d w ith h ig h efficiency. W ithsu ch an a lte rnating  vo lta gegen er ation cir cuit, ahi gh -v ol tag e alt e rnatingvo lta ge  is  caus e d to o ccuron a  s ec o nda ry side of a  tra ns fo rmer  by  d rivin g ap rim ary sid e of thetra n sfor me rby a cl ass-D amplifi er  output (r ef erto Jap a n ese Pate nt Laid-Open No. 2013-6 5 932, Ja pan ese P aten t Laid-Op enNo. H7 -24 1 083, f or exa mple) .How e v er, b e c au seth e class-Da m pli fierpe rfor ms swit ching driving of a bri dge circuit a t a  hig h fr equ e nc y , a  r a dia t i on noise occurs , and beca us e  a  ferrite b e ador  a filt er is u sed a s  a nois e counter -measure,  t hisl e ads  to a cost  increas e. Also,i f the cl ass-D  am plifie risusedby a c h arg ing h igh-vo lt age ci rcuit  o f a colo r image forming apparat us hav ing 4  im age formi ngu nit s for yel low,  magenta,cya n,and b lac k , itis n e ce ssa r y tochar g e each ph o to sen s i ti ve drum for t h e f our c olo r s. For  thi s reason, there i s  the problem t hatt h e f req u enci es  of the PWM si gna ls o f the cl as s-D amplifi ers used  c o rresp onding  to re spectiv e co l or pho tose nsi tive drum s o ve r lap, an dra d iation  noi se  worse ns. 1. Fiel d The present inve ntion r elate s  to  a bl ad e witha  tur bine opera ting in wat er, su ch a s a d evice d ri ven by  ti da l or river flow. Itis pa rticula rl y de sig ned fo r at u rbine  arr an ged  to rotat e ab o ut  a hor izon tal a xi s. H owever, t h e bladeiss uitable  f oru s e in a n yo r ientation. 
2.  Desc r i ption of t h e Re l at e d Art 
For a  turbi ne arra n ged  t o rotat e a b o ut a hori zontal ax i s i nwate r, the b la desar e c on ventionally hol low. How ever, th i s  leads  to a pr o blem i nthat as theblade  r o tates a b o utthe hor i zon tal 
 latent_image is_developed and a toner_image is_thereby_formed.
For photosensitive_drum_surface charge processing,_an AC charging_scheme that charges by_causing a charging_roller_to abut the surface of the photosensitive drum, for example, applying a voltage that_overlaps_a direct_current_voltage_and an alternating voltage to_the charging roller, and discharging_to the_surface of the photosensitive drum is employed. In_this_AC charging scheme,_the surface of the photosensitive drum can be charged_uniformly because discharge to the positive_side and to_the_negative_side occurs alternatingly because_voltage that overlaps an alternating voltage_on a direct current voltage is_applied.
A class-D amplifier is used for an_alternating voltage generation circuit for generating_an alternating voltage applied to_this charging_roller. This class-D amplifier converts_an input signal_into a_pulse width modulation_signal (a PWM signal), and drives_a bridge circuit_by the PWM signal. With this,_compared_to a conventional_analog_amplification_scheme, the_amplification signal can_be_obtained with_high_efficiency. With such an alternating voltage_generation_circuit, a high-voltage alternating voltage is caused_to occur on a_secondary_side of a transformer_by driving a primary side_of the transformer by a class-D_amplifier output_(refer to_Japanese Patent Laid-Open No. 2013-65932, Japanese Patent Laid-Open No. H7-241083, for_example).
However, because the class-D amplifier performs_switching driving of a_bridge circuit_at_a high frequency,_a_radiation noise_occurs, and because a ferrite bead or_a filter_is used as a noise counter-measure,_this leads to a_cost_increase. Also, if the class-D amplifier_is used by a charging high-voltage_circuit of a color image_forming_apparatus_having 4 image forming units_for yellow, magenta, cyan, and black,_it is necessary_to charge each photosensitive drum for the_four_colors. For this reason, there is_the_problem that the frequencies of the_PWM_signals_of the class-D amplifiers used_corresponding to respective color photosensitive drums_overlap, and radiation noise worsens. 1. Field
The present invention_relates to a_blade with a turbine operating_in_water,_such as a device driven by tidal or river flow._It is_particularly designed for_a turbine arranged to rotate about a horizontal axis. However,_the blade is suitable for use in_any orientation.
2. Description of the Related Art
For a turbine arranged to_rotate about a horizontal axis in water, the_blades are conventionally hollow. However, this leads_to a problem in_that_as the blade rotates about the horizontal