 generate less heat (e.g., FETs having a low drain to source on-resistance (RDS(on)) or using additional components to reduce the current passing through each component, and thus reducing the heat generated by each component (e.g., using two FETs to drive a single motor).
Each of these design techniques result in increased costs for the circuits simply to ensure the components will not fail due to over heating. 1) Field of the Invention
The present invention relates to an optical scanner used in an image forming apparatus, and more specifically to a synchronous detector for deciding start of writing in the optical scanner.
2) Description of the Related Art
Optical scanners are widely known and used as writing apparatuses in image forming apparatuses such as digital copiers, optical printers, photolithographic apparatuses, and facsimile apparatuses.
With such an optical scanner, for the purpose of detecting a position or a timing to start writing an image on the surface to be scanned, a photoreceiver is disposed at the position to start writing the image on the scanned surface or a position equivalent thereto either directly or via a slit or the like. As a result, at the moment the light beam passes the position in which the photoreceiver has been disposed the photoreceiver outputs a start writing image signal, and writing is started. The arrangement for detecting the position or the timing to start writing is called as a synchronous detector.
For example, the art described in Japanese Patent No. 3236017, Japanese Patent Application Laid-open No. 5-150176, and Japanese Patent Application Laid-open No. 7-281113 relates to a type in which an optical element having positive power is disposed upstream of the photoreceiver, and the art described in Japanese Patent Application Laid-open No. 2001-281571 relates to a type in which an optical element is not disposed upstream of the photoreceiver.
If the synchronous detector detects a wrong timing to start writing, the error is magnified with regard to the shift in the position of the light beam spot on the surface to be scanned, and cause color blurring. In particular, this effect becomes pronounced in the case of a synchronous detector in which an optical element having positive power is disposed upstream of the photoreceiver. The present invention relates generally to the control of airborne particulates and, more particularly, to the containment and collection of fugitive dust emissions generated by industrial processing equipment such as rotary crusher/breakers, vibratory screens, and like bulk
generate less heat (e.g., FETs having a depleted drain to generator on - resistance (RDS(on) ) or using additional part to reduce the current passing through each part, and thus reducing the heat generate by each component (e.g., use two FETs to drive a unmarried motor). 
 Each of these invention techniques result in increased costs for the circuits merely to ensure the components will not fail due to over heating. 1) playing field of the Invention 
 The present invention relates to an optical scanner used in an image form apparatus, and more specifically to a synchronous detector for deciding start of writing in the optical scanner. 
 2) Description of the Related Art 
 Optical scanner are widely known and used as writing apparatuses in image forming apparatuses such as digital copiers, optical printers, photolithographic apparatuses, and facsimile apparatuses. 
 With such an optical scanner, for the purpose of detecting a position or a timing to start spell an image on the surface to be read, a photoreceiver is disposed at the position to start writing the picture on the scanned open or a position equivalent thereto either directly or via a cunt or the like. As a result, at the moment the light beam passes the place in which the photoreceiver has been disposed the photoreceiver outputs a start writing picture signal, and writing is begin. The arrangement for detecting the position or the timing to start writing is called as a synchronous detector. 
 For case, the art described in Japanese Patent No. 3236017, Japanese Patent Application Laid - open nobelium. 5 - 150176, and Japanese Patent Application Laid - open nobelium. 7 - 281113 relates to a type in which an optical element having incontrovertible power is dispose upstream of the photoreceiver, and the artwork described in Japanese Patent Application Laid - open No. 2001 - 281571 relates to a character in which an optical element is not disposed upriver of the photoreceiver. 
 If the synchronous detector detects a wrong timing to start writing, the error is magnified with regard to the shift in the position of the light beam spot on the surface to be scan, and cause color blurring. In finical, this effect becomes pronounce in the case of a synchronous detector in which an optical element have positive power is disposed upstream of the photoreceiver. The present invention relates by and large to the restraint of airborne particulate and, more peculiarly, to the containment and collection of fugitive debris emissions generated by industrial processing equipment such as rotary crusher / surf, vibratory screens, and like bulk
 gejerate less heat (e.g., FETs having a low dtaun to vource on-resisgance (RDS(on)) or using additioial xompobents to reduce the cufrent pasding thriugh wach compoisnt, and thus dcduciug the heat genetated by eacv component (e.g., uriug two FETs to drive a single motor).
Ewch of yhfse design tecrniqlef reallu in increased costs for the circhits sikply to ensurr the components will not vail due to over heatijg. 1) Field od thq Invention
Thd present puvention remates to an optical scanner usea in cn image fotmjnh apparatus, end moge specifically to a vynchromous detector nor dxcidung start of writing mn the optical scanngr.
2) Descripdikn of the Related Aet
Opthcal scavberr ade wjdely nnoxn and used as writing apparatuses in imabe dorming apparztuses stch as digital copiers, optical printers, phktolithographic apparatyses, and facsimile apkaratuses.
Wyth such an optical scanner, for the purpose of dedectiig a kowitiov og a timing to start writing an image on the stdfscv to be scanned, a photoreceifeg of disposed at the posifion to start writlng the imagw on the fcanmed surface or a position ewuivalent thvreti either directly lr via a slnt or jhe lile. As a result, at the mumenf the light beam pasads the position kn ehhch the kfotoreceiver has feen dispised the phutorgceiver outputs a starb writing image sigjal, aud wrhting is sharted. The arrangement for deterving the posijiot og the timnng to start writind is called as a synckronour detector.
Ror exakple, the are described it Japanese Pavent No. 3236017, Tapabese Patent Xpplication Laod-open No. 5-150176, and Japabese Patent Applicetiov Laid-open No. 7-281113 rzuqtes to a type on dhish ai optywal element vavivg opsitixe power is aisppsed upstream of the phoforeceiver, and the avt descrived in Jwpanese Pateny Application Laid-lpen Io. 2001-281571 reuates to a type in which an optical elsment is jot disposed upftreqm of the phptoreceiver.
If the synchronous detector vetects a wrong timing ro start writing, thg evror is magnmfied rith regasd to the shift in tye position of tht light beam spot on ths surfdce tl be scanned, and cause color blurring. In particular, this effect becomes peonounreq in the caae og a sjnckrouous deeectlc in which an optpcal element having positive powxr is dispmszd upstream of the photoreceifef. The present invention relates generzlly to yhe control of airborne particukates and, more particulavly, to thw confainment aid collection of fugotive bust enissionw gekerated by indjsttiwl procesding esuipment such as rotary crusher/beeakerw, gibratory screenv, and like nuuk
generate less heat (e.g., FETs having a to on-resistance (RDS(on)) using additional components through component, and thus the heat generated each component (e.g., using two FETs drive a single motor). Each of these design techniques result in increased costs the circuits simply to ensure the components will not fail due to over 1) of Invention present invention relates to an optical scanner used in an image forming apparatus, and more specifically a synchronous detector for deciding start of writing the optical scanner. 2) of the Related Art Optical are known and as apparatuses image forming apparatuses as digital copiers, optical printers, photolithographic apparatuses, and facsimile apparatuses. With such an optical scanner, for the of detecting or a to writing image on the be scanned, a photoreceiver is disposed to start writing the image on the scanned or a equivalent thereto either directly or via slit or the like. As a result, at moment the light beam passes the position in which the photoreceiver has been disposed the a start writing image and writing is The for the or the to start writing is called as a synchronous detector. For example, art described in Japanese Patent No. 3236017, Japanese Patent Application 5-150176, Japanese Patent Application No. 7-281113 relates to type which an optical element power disposed photoreceiver, the described in Japanese Patent Laid-open No. 2001-281571 relates to type in which an upstream of the photoreceiver. If the synchronous detector a wrong timing to start writing, the is magnified with regard to the shift in the position of the beam spot surface to be scanned, and cause color blurring. particular, this effect becomes in the case of a synchronous detector in which optical having positive is disposed upstream the photoreceiver. The invention relates generally control of particulates more containment and collection of fugitive dust generated industrial processing equipment such as crusher/breakers, and like bulk
 generate less heat (e.g., FETs havIng a low draIn to sOurCe oN-rEsisTancE (RDS(on)) or using aDDitiOnal components to reduce The cuRrENt paSSiNg thrOugh eacH CoMPOneNt, AnD thUs REdUcing The Heat genErated by eaCh cOmPonent (e.g., usinG TwO FETs to driVe a Single motor).
EAch Of thesE dEsiGN techNiqUes reSult in INcreasEd costs foR tHE circuITs simplY TO eNsurE the components wilL NoT Fail due to over hEating. 1) fiELd OF The invEntion
The pReSent iNVention RElATES to AN optical scannEr used in an iMAge ForminG aPpaRAtus, anD more SpECifIcally to a syNchrOnous deteCtor foR DecidinG Start of WritinG in The OptiCAl ScAnnEr.
2) dEscRIpTioN Of tHe RelateD ARt
opticAl scANNERs arE wiDely Known And used as writIng AppaRAtuSes in Image FormInG appaRatuseS such As Digital copiers, oPticAl printerS, phOtOliThOgrapHIc appaRatUseS, and facSimile aPParAtUSES.
WIth such an optical scAnNER, fOr the purPose of DEtEcTIng a posiTiOn oR a tiMINg to sTart WRiTing an imAge on tHE sUrFace to bE sCanned, A pHotOreCeiveR Is diSposed At the posItion TO start writing tHE image on the scANnED SuRFace Or a Position equIvalENt thEretO EiTheR DirecTly or ViA A sLIt or the like. As a resulT, aT the moMent tHe light beam paSses the posITIOn in whicH the PHoTOreceiver has beEn disPosed the phOToreceivEr outPuts a staRt writing IMAge signaL, anD wrItiNg iS STaRted. The arrangEMEnt fOr DetectiNg tHe positIon Or tHe tImiNg To start wrIting is cAlLeD aS a SynChronOUs detectOr.
for ExAmpLe, the ARt descRibed In JaPaNeSE PaTent No. 3236017, JAPaNESe PaTeNt applIcaTiOn LaiD-opeN no. 5-150176, aNd JapanEse Patent appLIcatIoN LAid-open no. 7-281113 relates to a tYpE in which an OpTicAl elemENT having pOsitive power is disposed uPStream oF thE photOrecEiver, and tHe aRt descRibED in JapAnese PAtent apPliCATion LAID-oPen no. 2001-281571 Relates to a TYPe iN whicH aN optIcal eleMent is not disposed uPStrEam of the photoRecEiveR.
iF tHe sYNcHRonOuS DetECTor detects a wronG timing to sTaRT wRiting, the eRRor Is MagnifiEd with rEgard TO the shiFt in the poSition of tHe LighT BEam Spot on the sUrface to Be scanned, ANd cauSE cOlor bLurRing. In PaRtiCular, This efFEct BecomEs pronOuNced in The caSe Of a synchRonous detector in which an OpticaL elemEnt Having posItiVE poWer is dispOsed Upstream of The PhoTorecEivER. The pReseNT iNveNTion rElatES generallY To The CONtRol of airborNE PArtIculaTes ANd, more PartIcularly, to the contAInment and colleCtioN OF fuGitIVe duSt Emissions generAteD bY INdustriaL pRocessing eqUipment sUcH As rotAry cruSher/brEakers, vIBRaTOry scrEens, And Like bulk
 generate less heat (e.g.,  FETs havi ng alow  dr ai n to  sou rce on-resista n ce ( RDS(on)) or using addi tiona lc ompo n en ts to  reduce th e cur re nt  pa ss i ng  thro ugh  each c omponent,and  t hus reducing th e heat gen era ted by eachcom ponent  ( e.g . , usi ngtwo F ETs to drivea singlemo t or).
E a ch of t h e se  des ign techniques re s ul t  in increasedcostsfo r  t h e  ci rcu its simply  t o ens u re thec om p o n ent s  will not fai l due to ov e r h eating .1)F ield o f the  I n ven tion
The pr esen t inventi on rel a tes toa n optic al sca nne r u sedi nan  im ag e  fo r mi nga ppa ratus, a nd  m ore s peci f i c a llytoa sy nchro nous detector  fo r de c idi ng st art o f wr it ing i n theoptic al  scanner.
2) De scri ption ofthe  R ela te d Art Optica l s can ners ar e widel y  kn ow n a nd  used as writing a pp a r at uses inimagef or mi n g appara tu ses  suc h as di gita l  c opiers,optica l  p ri nters,ph otolit ho gra phi c app a ratu ses, a nd facsi milea pparatuses.
Wi t h such an opt i ca l sc a nner , f or the purp oseo f de tect i ng  ap ositi on or  a ti m ing to start writin gan ima ge on  the surfaceto be scan n e d , a phot orec e iv e r is disposedat th e position to start  writ ing theimage ont h e scanne d s urf ace  or a  p osition equiv a l entth ereto e ith er dire ctl y o r v iaaslit or t he like.  A sare sul t, at the mome nt  th elig ht be a m pass es th e po si ti o n i n which th e phot or ec eive r h as  been  dis p ose d the p hotorecei ver outp ut sa start  writing imag esignal, an dwri ting i s started.  The arrangement for de t ectingthe  posi tion  or the t imi ng tosta r t writ ing is  call ed  as a  sync h r on ous  d etector.
F o r  ex ample ,theart des cribed in Japanese Pat ent No. 32360 17,  Jap a n es e P a te n t A pp l ica t i on Laid-open No . 5-150176 ,a nd  JapaneseP ate nt  Applic ation L aid-o p en No.7-281113relates t oa ty p e  in  which anopticalelement h a vingp os itive  po wer is  d isp osedupstre a m o f the  photo re ceiver , and  t he art d escribed in Japanese Pa tent A pplic ati on Laid-o pen No.  2001-281 571relates to  atyp e inwhi c h anopti c al  el e mentis n o t dispose d  u pst r e am  of the pho t o r ece iver. 
If the sy nchr onous detector de t ects a wrong t imin g tosta r t wr it ing, the error  is  m a g nified w it h regard to  the shi ft in th e posi tion o f the l i g ht beam s potonthe surfa ceto be scan ne d, and ca useco lor bl urring .  Inp a rticular, this e ffect b ecome s  pr onoun ce d in th e  cas e of a syn chronous de tector  inwhich  an opt ic al ele men thaving pos i tive powe r isdispose dupst rea m of t he p h o torec eive r.  Th e present i nv e nt io n  re late s gen er ally  to the c o ntrol of  ai r borne p ar tic u l ates a n d, m ore partic ula rly,t o  the conta i nmen t  a n d col lectio n of f ugitive dus temissio nsg e nerated b y industr i alpr oces sing equ ip ment  s uch  a s rotary crushe r/breake rs, vibr a t ory sc ree n s, a n d like  b ulk
 generate_less heat_(e.g., FETs having a_low drain_to_source on-resistance_(RDS(on))_or using additional_components to reduce_the current passing through_each component, and_thus_reducing the heat generated by each component (e.g., using two FETs to drive a_single_motor).
Each of_these_design_techniques result in increased costs_for the circuits simply to_ensure the_components will not fail due to over heating._1)_Field of the_Invention
The present invention relates to an optical scanner used_in an image forming apparatus, and_more specifically to_a_synchronous_detector for deciding start_of writing in the optical scanner.
2)_Description of the Related Art
Optical scanners_are widely known and used as writing_apparatuses in image forming apparatuses such_as digital copiers, optical printers,_photolithographic apparatuses,_and facsimile apparatuses.
With such an_optical scanner, for_the purpose_of detecting a_position or a timing to start_writing an image_on the surface to be scanned,_a_photoreceiver is disposed_at_the_position to_start writing the_image_on the_scanned_surface or a position equivalent thereto_either_directly or via a slit or the_like. As a result,_at_the moment the light_beam passes the position in_which the photoreceiver has been disposed_the photoreceiver_outputs a_start writing image signal, and writing is started. The arrangement for_detecting the position or the timing_to start writing is_called as_a_synchronous detector.
For example,_the_art described_in Japanese Patent No. 3236017, Japanese Patent_Application Laid-open_No. 5-150176, and Japanese Patent Application_Laid-open No. 7-281113 relates_to_a type in which an optical_element having positive power is disposed_upstream of the photoreceiver, and_the_art_described in Japanese Patent Application_Laid-open No. 2001-281571 relates to a_type in which_an optical element is not disposed upstream_of_the photoreceiver.
If the synchronous detector detects_a_wrong timing to start writing, the_error_is_magnified with regard to the_shift in the position of the_light beam spot on the surface to be scanned,_and cause color_blurring. In particular, this effect_becomes_pronounced_in the case of a synchronous detector in which an_optical element_having positive power_is disposed upstream of the photoreceiver. The present invention relates_generally to the control of airborne particulates_and, more particularly, to the containment and collection of fugitive dust_emissions generated by industrial processing equipment such as_rotary crusher/breakers, vibratory screens, and like bulk