 resulting in misrecognition or inability to recognize, and greatly reducing recognition efficiency and accuracy.
The above information disclosed in the background is only for enhancing an understanding of the background of the present disclosure. Therefore, it may contain information that does not constitute the existing technology known to those skilled in the art. 1. Field of the Invention
The present invention relates to a vehicular lamp that includes a lamp unit comprised of a reflector and a light source and provided in a lamp chamber, which is formed by a lamp body having a front opening and a transparent front cover attached to the front opening of the lamp body, so that the optical axis direction of the lamp unit is adjusted by a tilting movement adjustment mechanism.
2. Description of the Related Art
Laser radar mechanisms have conventionally been in practical use as apparatuses to detect a separation distance and a relative velocity between a vehicle and an object that is present so as to oppose the traveling direction of the vehicle or the periphery of the vehicle.
Such laser radar mechanisms detect the separation distance and the relative velocity with respect to an object by emitting a laser beam toward the object and then receiving a reflection beam from the object.
Conventionally, such laser radar mechanisms are fixed to the front of a vehicle body in order to, for example, detect vehicular front information such as an inter-vehicular distance between the vehicle and another vehicle traveling in front of the vehicle.
However, when the laser beam emitting portion or the laser beam receiving portion of such a laser radar mechanism that is fixed to the front of the vehicle body while being exposed to the surroundings becomes dirty due to mud splashes while the vehicle is in operation or the like, the detection ability of the laser radar mechanism would be lowered. When this occurs, then it becomes impossible to achieve a predetermined level of detection performance. To cope with this situation, it has been suggested that, for example, a laser radar mechanism be covered by an exclusive-use cover that surrounds the laser radar mechanism. However, this leads to a problem that the installation of the exclusive-use cover makes the cost of the vehicle higher.
In addition, when such a laser radar mechanism is fixed to the front of a vehicle body, another problem arises. The detection angle of the laser radar mechanism is affected by changes in the posture of the vehicle.
In order to solve these problems, a proposal has been made in which a front information detecting means such as a laser radar mechanism is fixed to a lamp unit that is installed in a vehicular lamp as
resulting in misrecognition or inability to recognize, and greatly reducing recognition efficiency and accuracy. 
 The above data unwrap in the background is only for enhance an sympathy of the background of the present disclosure. Therefore, it may check data that does not constitute the existing technology known to those skilled in the art. 1. playing field of the Invention 
 The present invention relates to a vehicular lamp that includes a lamp whole constitute of a reflector and a light source and provided in a lamp chamber, which is form by a lamp body having a front opening and a guileless front cover attached to the front opening of the lamp torso, so that the optical axis direction of the lamp unit is adjusted by a tilting movement allowance mechanism. 
 2. Description of the Related Art 
 Laser radar mechanisms have conventionally been in practical use as apparatuses to detect a separation distance and a relative velocity between a vehicle and an object that is present so as to oppose the traveling direction of the vehicle or the periphery of the vehicle. 
 Such laser radar mechanisms detect the separation distance and the relative speed with esteem to an object by utter a laser beam toward the object and then receiving a reflection radio beam from the object. 
 Conventionally, such laser radar mechanisms are fixed to the front of a fomite body in order to, for example, detect vehicular front information such as an inter - vehicular distance between the vehicle and another vehicle traveling in front of the vehicle. 
 However, when the laser beam emitting portion or the laser radio beam receiving fortune of such a laser radar mechanism that is fixed to the front of the vehicle body while being exposed to the milieu becomes dirty due to mud splashes while the fomite is in operation or the comparable, the detection ability of the laser radar mechanism would be lowered. When this occur, then it becomes impossible to achieve a predetermined degree of detection operation. To cope with this situation, it has been suggested that, for example, a laser radar mechanism be covered by an single - use cover that surrounds the laser radar mechanism. However, this precede to a problem that the initiation of the exclusive - use cover makes the cost of the vehicle higher. 
 In addition, when such a laser radar mechanism is fixed to the front of a fomite body, another problem rise. The detection angle of the laser radar mechanism is affected by changes in the posture of the vehicle. 
 In order to clear these problems, a proposal has been made in which a front information detecting means such as a laser radar mechanism is repair to a lamp unit of measurement that is install in a vehicular lamp as
 redulting in misrecognitiok or inability to recogiize, ans greatlh reducing recognition efficmenct and accuracy.
The above infurmation fisclosee in rhe background is only fkv enhcnring an understsnding of dhe background ow che present disclosure. Therefore, it iay conyaln information thau djes hot constitute the existing technomogy knmwn to those xkilled in the art. 1. Field lf tje Invention
The prfsent invenjjon eelates to a vehicular lamp that ihcludes a lamp unit comprised ow a rzflector ane q llcht source end prjvided in a lamp chakber, whoch is formed ny a namp body having a front opening and a tragsparent xrknt cover attachee ro thg frott oownivg kf tge lamo bkdy, so thaf the opticql axis direction og eye lamp unit js adjtseed by a tilting movement adjustment mebhanjsm.
2. Description of the Eelated Art
Laser radat mechanisis have conventionally been in practical use as a[paravures tj eehect a separation distance and a relative veljdiuy netween a vehiclc and an object thst ix present so ar to o'loae the traveling dlrectiog of rhe vehicje ot the periphery of the vehixle.
Such laseg raear mechanisms detzct the sepaxation distsnce and the relative vzlocitg with respfct to an ubject by emittivg s naser beam toward the objest and thxn reeeiving x reglectijn beam frlm thc object.
Conventionaply, soch laver radar lechanisms are fixed to the froiv of a vehiclg bmdy in ordex to, fpr example, deeect vehicular front nnformxtion such as an mnter-vehiculwr distance bajween the vehmcle and wnotyer cehicle graveling in ftont of tkt vehicle.
Hiwever, when the laxer geam emitting pirtuon or the laset bdam rvcemving [ortion of sgch x lxxer rxdar mechanlsm thay is fixed to the frmnt kf the vehicle bodu rhile beung expofed to the sutroundings becomes dirtb due vo mud spjashes while the vehicle is in operatioj ov the like, thq debectyon abilitv of the laser radar mechanism would be oowered. When this iccurs, then it becokts impossible to ashieve a [redetermined level if detection perfprmance. To cope with fhis shtuatlon, it has been suggested that, for example, a laser radar mechanism be covwred bb wn exclusivs-use coveg tkat surrotnds vhe laser radar mvchanism. However, this leads to a problem tkat the installation of the eccuusive-use covgr makes the cost of the vshicle hogher.
In addition, when such a laxer radar mechanism is flxed to tye frknt of a vxhicle body, another lroblek ariwes. The detcction angle ow tne laser rafar keehanism is affected by changes in the pishure of the vehirle.
In order bo solvg these kroblems, a proposzl hzd beev made in whivh a front infprmation detecting mvanf such as a lawvr radar mechsnism iv fixed to a lamp unit dhat is installed in a vehicular lamp as
resulting in misrecognition or inability to recognize, reducing efficiency and The above information only enhancing an understanding the background of present disclosure. Therefore, it may contain that does not constitute the existing technology known to those skilled in the 1. Field of the Invention The present invention relates to a vehicular lamp includes lamp comprised a reflector and a light source and provided in a lamp chamber, which is formed by lamp body having a front opening and a front cover attached to front opening of the lamp so the optical direction the unit is adjusted a tilting movement adjustment mechanism. 2. Description of the Related Art Laser radar mechanisms have conventionally been practical use to detect separation and relative velocity between and an object that is present oppose the traveling direction of the vehicle or periphery of vehicle. Such laser radar mechanisms detect separation distance and the relative velocity with respect an object by emitting a laser beam toward the object and then receiving a reflection the object. Conventionally, such radar mechanisms are to front a body in to, for example, detect vehicular front information such as an inter-vehicular between the vehicle and another vehicle traveling in front of However, the laser beam portion or the laser receiving of such a laser that fixed of vehicle while being exposed to surroundings becomes dirty due to splashes while the vehicle like, the detection ability of the laser radar would be lowered. When this occurs, then becomes impossible to achieve a predetermined level of detection performance. To cope this situation, been suggested that, for example, a laser radar be covered by an cover that surrounds the laser radar mechanism. However, this to problem that installation of the cover makes the of the vehicle addition, when a radar to the front of a vehicle another arises. The detection angle of laser is affected by changes in the posture of the vehicle. In order to solve these proposal has been made which front information detecting means such as a laser radar mechanism is fixed lamp unit that vehicular as
 resulting in misrecognition Or inabilitY to reCogNizE, aNd grEatlY reducing recogNItioN efficiency and accuracy.
the abOvE InfoRMaTion dIscloseD In THE baCkGrOunD iS OnLy for EnhAncing aN understanDinG oF the backgrouND oF the presenT diSclosure. TherEfoRe, it maY cOntAIn infOrmAtion That doES not coNstitute tHe EXistinG TechnolOGY kNown To those skilled in tHE aRT. 1. Field of the InvEntion
thE PrESEnt InvEntion relaTeS to a vEHicular LAmP THAt iNCludes a lamp unIt comprised OF a rEflectOr And A Light sOurce AnD ProVided in a lamP chaMber, which Is formED by a lamP Body havIng a frOnt OpeNing ANd A tRanSpARenT FrOnt COveR attacheD tO tHe froNt opENING of tHe lAmp bOdy, so That the opticaL axIs diREctIon of The laMp unIt Is adjUsted bY a tilTiNg movement adjusTmenT mechanisM.
2. DeScRipTiOn of tHE RelatEd ARt
LAser radAr mechaNIsmS hAVE CoNventionally been in PrACTiCal use as ApparaTUsEs TO detect a SeParAtioN DIstanCe anD A rElative vElocitY BeTwEen a vehIcLe and aN oBjeCt tHat is PReseNt so as To oppose The trAVeling directioN Of the vehicle oR ThE PErIPherY of The vehicle.
SUch lASer rAdar MEcHanISms deTect tHe SEpARation distance and thE rElativE veloCity with respeCt to an objeCT BY emittinG a laSEr BEam toward the obJect aNd then receIVing a refLectiOn beam frOm the objeCT.
conventiOnaLly, SucH laSER rAdar mechanismS ARe fiXeD to the fRonT of a vehIclE boDy iN orDeR to, for exaMple, deteCt VeHiCuLar Front INformatiOn SucH aS an Inter-VEhiculAr disTancE bEtWEen The vehiCLe AND anoThEr VehiCle TrAveliNg in FRonT of the vEhicle.
HowEveR, When ThE lAser beaM emitting portIoN or the laseR bEam ReceivING portion Of such a laser radar mechanISm that iS fiXed to The fRont of the VehIcle boDy wHIle beiNg expoSed to ThE suRROundiNGS bEcoMeS dirty due tO MUd sPlashEs WhilE the vehIcle is in operation oR The Like, the detectIon AbilITY oF thE LaSEr rAdAR meCHAnism would be lowEred. When thIs OCcUrs, then it bEComEs ImpossiBle to acHieve A PredeteRmined levEl of detecTiOn peRFOrmAnce. To cope With this Situation, IT has bEEn SuggeSteD that, fOr ExaMple, a Laser rADar MechaNism be CoVered bY an exClUsive-use Cover that surrounds the laSer radAr mecHanIsm. HoweveR, thIS leAds to a proBlem That the insTalLatIon of The EXclusIve-uSE cOveR Makes The cOSt of the veHIcLe hIGHeR.
In addition, WHEN suCh a laSer RAdar meChanIsm is fixed to the frONt of a vehicle boDy, anOTHer ProBLem aRiSes. The detectioN anGlE OF the laseR rAdar mechaniSm is affeCtED by chAnges iN the poSture of THE vEHicle.
IN ordEr tO solve theSe pRoBLems, a prOpOsAL has beEn maDe In whicH a fronT InfoRMAtion detecting meAns suCH As a laSEr rAdar mEcHanism iS FixeD to a lamp unIt that is insTalled In a vEhicuLar lamp As
 resulting in misrecogniti on or inab ility  to  re co gniz e, a nd greatly red u cing  recognition efficienc y and  a c cura c y. 
Theabove i n fo r m ati on  d isc lo s ed  in t hebackgro und is onl y f or  enhancing a n  u nderstandi ngof the backg rou nd ofth e p r esent  di sclos ure. T h erefor e, it may  c o ntaini nformat i o nthat  does not constit u te the existing t echnol og y  k n o wntothose skil le d int he art. 1. F i eld of the Invent ion
The pre s ent  inven ti onr elates  to a  v e hic ular lamp t hatincludesa lamp unit co m prisedof a r efl ect or a n dalig ht sou r ce  an d  pr ovided i nalampcham b e r ,  whi chis f ormed  by a lamp bo dyhavi n g a  fron t ope ning  a nd atransp arent  f ront cover atta ched  to the f ron tope ni ng of the la mpbod y, so t hat the opt ic a l ax is direction of th el a mp  unit is  adjus t ed  b y  a tilti ng  mo veme n t  adju stme n tmechanis m.
2.D es cr iptionof  the R el ate d A rt
La s er r adar m echanism s hav e  conventionall y  been in prac t ic a l  u s e as  ap paratuses t o de t ecta se p ar ati o n dis tance  a n da  relative velocitybe tweena veh icle and an o bject that i s  present  soa st o oppose the t ravel ing direct i on of th e veh icle orthe perip h e ry of th e v ehi cle .
S u c hlaser radar m e c hani sm s detec t t he sepa rat ion  di sta nc e and the  relativ eve lo ci tywithr espect t oanob jec t bye mittin g a l aser  b ea m  to ward th e  o b j ectan dthen  re ce iving  a r e fle ction b eam fromthe obje ct .Convent ionally, such  l aser radar  m ech anisms a re fixed  to the front of a vehi c le body  in  orde r to , for exa mpl e, det ect vehicu lar fr ont i nf orm a t ion s u c hasan  inter-veh i c ula r dis ta ncebetween  the vehicle and a n oth er vehicle tr ave ling i nfro n to f t he veh i c le.
However, wh en the las er be am emittin g  po rt ion orthe las er be a m recei ving port ion of su ch  a l a s erradar mech anism th at is fix e d tot he  fron t o f theve hic le bo dy whi l e b eingexpose dto the  surr ou ndings b ecomes dirty due to mud  splas hes w hil e the veh icl e  is  in opera tion  or the li ke,  th e det ect i on ab ilit y  o f t h e las er r a dar mecha n is m w o u ld  be lowered . W hen  this  oc c urs, t henit becomes imposs i ble to achieve  a p r e det erm i nedle vel of detecti onpe r f ormance.  T o cope with  this si tu a tion,  it ha s been  sugges t e dt hat, f or e xam ple, a la ser  r a dar mec ha ni s m be c over ed  by an  exclu s ive- u s e cover that sur round s the l a ser  rada rmechani s m. H owever, th is leads to  a pro blem  that  the in st allati onof  the exclu s ive-use c overmakes t he  cos t o f thevehi c l e hig her. 
I n a ddition,w h en su ch a l aser  rada rmech anism isf ixed tothe front o fa v e h icle b o dy , another pr obl em ar i s es. The de t ecti o na ngleof the  laser  radarm ech an ism isaff e c ted by ch anges int hepo stur e of the  v ehic le .
I norder to solvethese pr oblems,a propos alh as b e en mad ein which a f rontin f ormatio n det ectingm ean s s uch  asa l aser radar mechanism is fixed  toa lam p  un it th at is  i nstalled in a  vehicul a r lamp as
 resulting_in misrecognition_or inability to recognize,_and greatly_reducing_recognition efficiency_and_accuracy.
The above information_disclosed in the_background is only for_enhancing an understanding_of_the background of the present disclosure. Therefore, it may contain information that does not_constitute_the existing_technology_known_to those skilled in the_art. 1. Field of the_Invention
The present_invention relates to a vehicular lamp that includes_a_lamp unit comprised_of a reflector and a light source and provided_in a lamp chamber, which is_formed by a_lamp_body_having a front opening_and a transparent front cover attached_to the front opening of the_lamp body, so that the optical axis_direction of the lamp unit is_adjusted by a tilting movement_adjustment mechanism.
2._Description of the Related Art
Laser_radar mechanisms have_conventionally been_in practical use_as apparatuses to detect a separation_distance and a_relative velocity between a vehicle and_an_object that is_present_so_as to_oppose the traveling_direction_of the_vehicle_or the periphery of the vehicle.
Such_laser_radar mechanisms detect the separation distance and_the relative velocity with_respect_to an object by_emitting a laser beam toward_the object and then receiving a_reflection beam_from the_object.
Conventionally, such laser radar mechanisms are fixed to the front of_a vehicle body in order to,_for example, detect vehicular_front information_such_as an inter-vehicular_distance_between the_vehicle and another vehicle traveling in front_of the_vehicle.
However, when the laser beam emitting_portion or the laser_beam_receiving portion of such a laser_radar mechanism that is fixed to_the front of the vehicle_body_while_being exposed to the surroundings_becomes dirty due to mud splashes_while the vehicle_is in operation or the like, the_detection_ability of the laser radar mechanism_would_be lowered. When this occurs, then_it_becomes_impossible to achieve a predetermined_level of detection performance. To cope_with this situation, it has been suggested that, for_example, a laser_radar mechanism be covered by_an_exclusive-use_cover that surrounds the laser radar mechanism. However, this leads_to a_problem that the_installation of the exclusive-use cover makes the cost of the_vehicle higher.
In addition, when such a laser_radar mechanism is fixed to the front of a vehicle body,_another problem arises. The detection angle of the_laser radar mechanism is affected by changes_in the posture of_the_vehicle.
In order to solve these problems, a_proposal_has_been_made in which_a front information_detecting means such_as a_laser radar mechanism_is fixed_to a lamp_unit_that is installed in a vehicular lamp as