 the plural key contacts of the key switch; power supply control key state detecting means for detecting an open/close state of a contact of the power supply control key independent from the open/close state detection by the key scan circuit; and a power supply for commencing a supply of electric power in such a case that the close state of the contact of the power supply control key is detected by the power supply control key state detecting means; and processing means for stopping the supply of the electric power from the power supply in the case that the close state of the contact of the power supply control key is detected by the key scan circuit.
Preferably, in the power supply control apparatus, the key scan circuit may include: scanning means for scanning any one of a row and a column of the key matrix by way of a binary logic signal; and key state detecting means for acquiring the binary logic signal of the scanning means via the key matrix, and for separately detecting the open/close states of the plurality of key contacts based upon the logic value of the acquired binary logic signal.
According to third aspect of the present invention, a power supply control method for a power supply control apparatus of a portable electronic equipment comprising; a key switch formed by arranging a plurality of key contacts at cross points of a key matrix, and equipped with one of the plural key contacts as a power supply control key; a key scan circuit for detecting open/close states of the plural key contacts of the key switch; power supply control key state detecting means for detecting an open/close state of a contact of the power supply control key independent from the open/close state detection by the key scan circuit; and a power supply; the power supply control method is comprised of: a power supply starting step for starting a supply of electric power in such a case that the close state of the contact of the power supply control key is detected by the power supply control key state detecting means; and a power supply stopping step for stopping the supply of the electric power from the power supply in the case that the close state of the contact of the power supply control key is detected by the key scan circuit.
Preferably, in a power supply control method, the detection of the close state of the contact of the power supply control key by the key scan circuit at the power supply stopping step includes: a scanning step for scanning any one of a row and a column of the key matrix by way of a binary logic signal; and a key state detecting step for acquiring the binary logic signal of the scanning means
the plural key contacts of the key switch; exponent provision control key department of state detection means for detecting an open / near state of a contact of the ability supply control cardinal independent from the open / close state signal detection by the key scan circuit; and a exponent supply for commencing a provision of electric power in such a case that the close country of the contact of the power provision control winder is detected by the might supply control key department of state detecting means; and processing means for stopping the supply of the electric power from the power supply in the case that the close state of the contact of the power supply control key is detected by the cardinal scan tour. 
 Preferably, in the power provision control apparatus, the cardinal scan circuit may include: scanning means for read any one of a row and a column of the key matrix by way of a binary logic signal; and key department of state detecting means for acquiring the binary logic signal of the scanning means via the key matrix, and for separately detect the open / close states of the plurality of key contacts based upon the logic value of the acquire binary logic signal. 
 According to third aspect of the present invention, a power supply control method acting for a power supply control apparatus of a portable electronic equipment comprising; a key switch formed by arranging a plurality of cardinal contacts at cross points of a key matrix, and equipped with one of the plural cardinal contacts as a power supply control samara; a key scan lap for detecting open / close states of the plural key contact of the key switch; power supply control key state detecting mean for detecting an open / near state of a contact of the power supply control key independent from the candid / close state detection by the key scan circuit; and a power provision; the power supply control condition method is comprised of: a power supply starting step for start a supply of electric power in such a case that the near department of state of the contact of the power supply command key is detected by the power provision control key state detecting means; and a power supply stopping step for stopping the provision of the electric baron from the power supply in the case that the close state of the contact of the power supply control key is detect by the cardinal scan circuit. 
 Preferably, in a exponent supply control method acting, the detection of the close state of the contact of the power supply control key by the key scan circuit at the power provision stopping step include: a scan step for scanning any one of a row and a column of the key matrix by room of a binary logic signal; and a key state detecting step for acquire the binary logic signal of the scanning means
 thf plural key contacts of the key switch; power vupply control key state detecting means flr detexting an open/close stage of a clntact od tht power supply coifrol ken indsiendeut from the open/glose state detection by dhd ney scan circuit; and a power supply for cokmfncing a suppli of tlestrid power in such a case that the clkse staue of the contact pf the power supply controp kej is detected by tje power suklly xontrol key rtate detebcing means; znd processing means for stoppivg thz supply of tye fnectric powxr froi the power supply it the csse that the ckosx stqte of the contact of the power supply sontrol kay is detected by tye key vcan cirzyit.
Orerecabmy, in hhe power suplly control apparatus, the key xcwb circuit may incluqe: scanning means for scanning any one of a dow and a column of the key matrix by way of a binary logic signal; and key state detecting means for awquirmne tkc cunwry logic signal of the scanning means via thq kty katrix, and for separately dftrsting the opev/close stztes of the plurallty of hey cintacts bwsed upon the logic value of thw acquired bpnart logic signal.
Accoxding to thixd aspgct of the present invention, c powed supply cojtrol metgud for a power sjppky control apparatus of a powtable elxctrouic equiomenj comprysing; a kej swibwh formed by arranhing c plusality of ney contacts at cross points of a key matrix, sng exuipped cith oke of the pluraj key contacts as a pjwer rupply connrol key; e key scan cyrcuit for dedgcting open/clmse statqs od thw plurau key contacts pf the kej fwitxh; power supply coktrol iey state deteccnnt means for detrctkng aj ppqt/close state of x cumtact of the powcr ruppky control key indepandeht from the open/clpsc state dgtection fy the key scsn circuit; and a plwer vup'ly; thr pjwer supply control method is domprised of: a power sup[ly wtarting ste' for starting a supply of electric powec in such a case that jhe close state of thg cpntact of tie powqr supply control key is detexted by the power supply control key sfate datectlng means; and a power supply stopping step for stopping the supply of the electcis power froj thr powvr fbpply ig thx rase that the cloxe state of the contact of the 'ower suppny control key is detected by yhd key scan citcuit.
Preferably, in a power supply vontrol method, the detection of the close state of the gontact od the power sup'ly control key by tne key scan circuir at the power suoplu dtopping dtep iucludes: a scanning step for scannung ant lne of a row and a column on uhe key matriv by way of a bihary pogic signal; and a key state detrcting step for acquprigg the binary okgic signal pf thg scanning meanx
the plural key contacts of the key supply key state means for detecting contact the power supply key independent from open/close state detection by the key circuit; and a power supply for commencing a supply of electric power in a case that the close state of the contact of the power supply key detected the supply control key state detecting means; and processing means for stopping the supply of the electric from the power supply in the case that close state of the of the power supply control is by the scan Preferably, the power supply apparatus, the key scan circuit may include: scanning means for scanning any one of a row and column of matrix by of binary signal; and key means for acquiring the binary logic scanning means via the key matrix, and for detecting the states of the plurality of key based upon the logic value of the acquired logic signal. According to third aspect of the present invention, a power supply control method power supply control apparatus a portable electronic comprising; key formed arranging a of key contacts at cross points of a key matrix, and with one of the plural key contacts as a power key; key scan circuit detecting open/close states of plural contacts of the key supply key for an state of a contact the power supply control key from the open/close state circuit; and a power supply; the power supply method is comprised of: a power supply step for starting a supply of electric power in such a case the close the contact of the power supply control key detected by the power control key state detecting means; and a power supply step stopping the of the electric from the power in the case close state the of control key is detected by the scan Preferably, in a power supply method, of the close state of the contact of the power supply control key by the circuit at the power stopping includes: a scanning step for scanning any one of a row and of the key a logic signal; a key state detecting for acquiring the binary logic signal of the means
 the plural key contacts of the Key switch; pOwer sUppLy cOnTrol Key sTate detecting mEAns fOr detecting an open/close State Of A ContACt Of the Power suPPlY COntRoL kEy iNdEPeNdent FroM the opeN/close statE deTeCtion by the keY ScAn circuit; aNd a Power supply fOr cOmmencInG a sUPply oF elEctriC power IN such a Case that tHe CLose stATe of the CONtAct oF the power supply coNTrOL key is detected By the pOwER sUPPly ConTrol key staTe DetecTIng meanS; AnD PROceSSing means for sTopping the sUPplY of the ElEctRIc poweR from ThE PowEr supply in tHe caSe that the Close sTAte of thE Contact Of the pOweR suPply COnTrOl kEy IS deTEcTed BY thE key scan CiRcUit.
PrEferABLY, In thE poWer sUpply Control apparaTus, The kEY scAn cirCuit mAy inClUde: scAnning Means FoR scanning any one Of a rOw and a colUmn Of The KeY matrIX by way Of a BinAry logiC signal; ANd kEy STATe Detecting means for aCqUIRiNg the binAry logIC sIgNAl of the sCaNniNg meANS via tHe keY MaTrix, and fOr sepaRAtElY detectInG the opEn/CloSe sTates OF the PluralIty of key ContaCTs based upon the LOgic value of thE AcQUIrED binAry Logic signal.
accoRDing To thIRd AspECt of tHe preSeNT iNVention, a power supply CoNtrol mEthod For a power suppLy control aPPARatus of a PortABlE Electronic equiPment Comprising; A Key switcH formEd by arraNging a pluRALity of keY coNtaCts At cROSs Points of a key mATRix, aNd EquippeD wiTh one of The PluRal Key CoNtacts as a Power supPlY cOnTrOl kEy; a keY Scan circUiT foR dEteCting OPen/cloSe staTes oF tHe PLurAl key coNTaCTS of tHe KeY swiTch; PoWer suPply COntRol key sTate detecTinG MeanS fOr DetectiNg an open/close StAte of a contAcT of The powER Supply coNtrol key independent from THe open/cLosE statE detEction by tHe kEy scan CirCUit; and A power SupplY; tHe pOWEr supPLY cOntRoL method is cOMPriSed of: A pOwer Supply sTarting step for starTIng A supply of elecTriC powER In SucH A cASe tHaT The CLOse state of the coNtact of the PoWEr Supply contROl kEy Is detecTed by thE poweR Supply cOntrol key State deteCtIng mEANs; aNd a power suPply stopPing step fOR stopPInG the sUppLy of thE eLecTric pOwer frOM thE poweR supplY iN the caSe thaT tHe close sTate of the contact of the poWer supPly coNtrOl key is deTecTEd bY the key scAn ciRcuit.
PrefeRabLy, iN a powEr sUPply cOntrOL mEthOD, the dEtecTIon of the cLOsE stATE oF the contact OF THe pOwer sUppLY contrOl keY by the key scan circUIt at the power suPply STOppIng STep iNcLudes: a scanning SteP fOR Scanning AnY one of a row aNd a columN oF The keY matriX by way Of a binaRY LoGIc signAl; anD a kEy state deTecTiNG step foR aCqUIring tHe biNaRy logiC signaL Of thE SCanning means
 the plural key contacts o f the keyswitc h;pow er  sup plycontrol key st a te d etecting means for det ectin ga n op e n/ close  stateo fa con ta ct  of  t h epower  su pply co ntrol keyind ep endent fromt he  open/clos e s tate detecti onby the  k eys can c irc uit;and ap ower s upply for  c o mmenci n g a sup p l yof e lectric power ins uc h  a case that t he clo se st a t e o f t he contact  o f the power s u pp l y con t rol key is de tected by t h e p ower s up ply contro l key  s t ate  detectingmean s; and pr ocessi n g means for sto ppingthe  su pply of  t heel e ctr i cpow e r f rom thepo we r sup plyi n t he c ase  tha t the  close stateofthec ont act o f the  pow er  supp ly con trolke y is detected b y th e key sca n c ir cui t. 
Pref e rably,  in  th e power  supply con tr o l ap paratus, the key s ca n ci rcuit ma y incl u de :s canningme ans  for s canni ng a n yone of a  row a n dacolumnof  the k ey  ma tri x byw ay o f a bi nary log ic si g nal; and key s t ate detecting me a n sf or a cqu iring the b inar y  log ic s i gn alo f the  scan ni n gm eans via the key ma tr ix, an d for  separately d etecting t h e open/clo se s t at e s of the plura lityof key con t acts bas ed up on the l ogic valu e of the a cqu ire d b ina r y  l ogic signal.A c cord in g to th ird  aspect  of  th e p res en t inventi on, a po we rsu pp lycontr o l method  f orapow er su p ply co ntrol  app ar at u s o f a por t ab l e  ele ct ro nicequ ip mentcomp r isi ng; a k ey switch  fo r medby  a rrangin g a plurality  o f key cont ac tsat cro s s  pointsof a key matrix, and eq u ipped w ith  oneof t he plural  ke y cont act s  as apowersuppl ycon t r ol ke y ;  a  ke yscan circu i t  fo r det ec ting  open/c lose states of the plu ral key conta cts  oft h ekey sw i tch ;p owe r supply controlkey statede t ec ting means for  d etectin g an op en/cl o se stat e of a co ntact ofth e po w e r s upply cont rol keyindepende n t fro m  t he op en/ closest ate  dete ctionb y t he ke y scan  c ircuit ; and  a  power s upply; the power supply  contr ol me tho d is comp ris e d o f: a powe r su pply start ing  st ep fo r s t artin g as up ply of el ectr i c power i n  s uch a  c ase that th e c los e sta teo f thecont act of the powers upply controlkeyi s  de tec t ed b ythe power supp lyco n t rol keyst ate detecti ng means ;a nd apowersupply  stoppi n g  s t ep for  sto ppi ng the su ppl yo f the e le ct r ic pow er f ro m thepowers uppl y in the case that  thec l ose s t ate  of t he  contac t  ofthe powersupply cont rol ke y is  dete cted by  t he key  sc an  circuit.P referably , ina power  s uppl y c ontrol  met h o d, th e de te cti on of the c lo s est a teof t he co nt actof the po w er suppl y c o ntrol k ey  by t he key sc a n  circuit a t t he po w e r supply s t oppi n gs tep i nclude s: a s canning ste pfor sca nni n g  any oneof a rowa ndacolu mn of th ekeyma tri xby way of a bin ary logi c signal ; and akey stat e  detec ti ng step foracqui ri n g the b i n ary  logics ign alofthesca nnin g  means
 the_plural key_contacts of the key_switch; power_supply_control key_state_detecting means for_detecting an open/close_state of a contact_of the power_supply_control key independent from the open/close state detection by the key scan circuit; and_a_power supply_for_commencing_a supply of electric power_in such a case that_the close_state of the contact of the power supply_control_key is detected_by the power supply control key state detecting means;_and processing means for stopping the_supply of the_electric_power_from the power supply_in the case that the close_state of the contact of the_power supply control key is detected by_the key scan circuit.
Preferably, in the_power supply control apparatus, the_key scan_circuit may include: scanning means_for scanning any_one of_a row and_a column of the key matrix_by way of_a binary logic signal; and key_state_detecting means for_acquiring_the_binary logic_signal of the_scanning_means via_the_key matrix, and for separately detecting_the_open/close states of the plurality of key_contacts based upon the_logic_value of the acquired_binary logic signal.
According to third_aspect of the present invention, a_power supply_control method_for a power supply control apparatus of a portable electronic equipment_comprising; a key switch formed by_arranging a plurality of_key contacts_at_cross points of_a_key matrix,_and equipped with one of the plural_key contacts_as a power supply control key;_a key scan circuit_for_detecting open/close states of the plural_key contacts of the key switch;_power supply control key state_detecting_means_for detecting an open/close state_of a contact of the power_supply control key_independent from the open/close state detection by_the_key scan circuit; and a power_supply;_the power supply control method is_comprised_of:_a power supply starting step_for starting a supply of electric_power in such a case that the close state_of the contact_of the power supply control_key_is_detected by the power supply control key state detecting means;_and a_power supply stopping_step for stopping the supply of the electric power from_the power supply in the case that_the close state of the contact of the power supply control_key is detected by the key scan circuit.
Preferably,_in a power supply control method, the_detection of the close_state_of the contact of the power supply_control_key_by_the key scan_circuit at the_power supply stopping_step includes:_a scanning step_for scanning_any one of_a_row and a column of the key matrix by way of a binary logic signal; and a key_state detecting step for acquiring the_binary logic signal of the_scanning_means