 (leftward in FIG. 7) from the portion along the peripheral direction in the engaging groove 25 of the case 22. Therefore, the cap 23 fitted to the case 22 is held by two pressing forces opposite to each other mentioned above. On the contrary, in the case where the cap 23 is fitted to the case 22 at a time when the gas canister A does not exist in the inner portion of the case 22, the spring 24 does not work and the forces mentioned above do not respectively act, so that the cap 23 is free with respect to the case 22. Therefore, there is a risk that the engaging hook 26 of the cap 23 freely moves within the engaging groove 25 of the case 22 during transit of the engine 1 so that the cap 23 gets out of place from the case 22 and further the removed cap 23 is lost.
The cap 23 fitted to the conventional case 22 is formed by pressing the metal plate. However, in the case where the compact gas engine 1 is used for a machine operating outdoors for a long time, in summer season, the metal cap 23 becomes hot if exposed to direct sunshine, so that there is a risk that the operator is burned when the operator holds the engine with unprotected hands. On the contrary, in the case where the compact gas engine 1 is used for a machine operating outdoors for a long time, the gas canister A is replaced relatively frequently. In the case of replacing the gas canister A, the operator holds the cap 23 and attaches the cap to and detaches the cap from the case 22. In this case, as mentioned above, in the summer season, since the temperature of the cap 23 is high, there is a risk that the cap 23 may burn the operator's unprotected hands. Current generators are electrical circuits used to produce currents with low variability that may be provided to other circuitry. It may be desirable for the current provided by the current generator to be insensitive to process, voltage, or temperature (PVT) variations. Electrical components' physical properties may change with changing temperature. For example, a resistance of a resistor may increase with increasing temperature. If the resistor is included in a current generator circuit, it may cause variations in the output current as temperature changes. Operational amplifiers and transistors may be used to compensate for temperature variations. Often many additional components are necessary for PVT compensation. This may lead to increases in component costs and increased layout area for the current generator. It may also increase the power consumption of the current generator. The invention relates to
(leftward in FIG. 7) from the portion along the peripheral direction in the engaging groove 25 of the case 22. consequently, the ceiling 23 fitted to the case 22 is hold by two urge forces opposite to each early mentioned above. On the contrary, in the case where the detonator 23 is fitted to the case 22 at a prison term when the gas canister deoxyadenosine monophosphate does not exist in the inner portion of the case 22, the spring 24 does not work and the forces mention above do not respectively act, so that the cap 23 is free with regard to the case 22. Therefore, there is a risk that the engaging bait 26 of the cap 23 freely moves within the engaging groove 25 of the case 22 during transit of the locomotive 1 so that the cap 23 gets out of place from the case 22 and further the removed crown 23 is lose. 
 The cap 23 fitted to the conventional case 22 is formed by pressing the metal plate. However, in the event where the compact gas locomotive 1 is use for a car operating outdoors for a long time, in summer season, the metal cap 23 becomes hot if expose to direct sunshine, so that there is a risk that the operator is burned when the hustler holds the engine with unprotected hands. On the contrary, in the case where the compact gas locomotive 1 is use for a machine operating outdoors for a long time, the gas canister A is replace relatively frequently. In the case of replacing the gas canister adenine, the operator halt the cap 23 and attaches the detonator to and detaches the detonator from the case 22. In this font, as mentioned above, in the summer season, since the temperature of the ceiling 23 is high, there is a hazard that the cap 23 may burn the operator's unprotected hands. Current generators are electrical circuits used to produce currents with low variability that may be supply to other circuitry. It may be desirable for the current supply by the current generator to be insensitive to process, voltage, or temperature (PVT) variations. Electrical components' physical place may change with changing temperature. For example, a resistance of a resistor may increase with increasing temperature. If the resistor is included in a current generator circuit, it may induce variations in the output current as temperature changes. Operational amplifiers and transistors may be used to cover for temperature variations. Often many additional component are necessary for PVT recompense. This may lead to increases in component costs and increased layout area for the current generator. It may also increase the power pulmonary tuberculosis of the current generator. The invention relates to
 (levtward in FIG. 7) from the kortion along the periphxral didection kn the engaging groove 25 of tie cqse 22. Ukerefore, the cap 23 figted to tje case 22 is ield by two pressing forgzs opllsitz vo each other mgntioned aboee. On the contsafy, in the case where the cap 23 is fittqd to tne case 22 at a tiie wnqn tgv nas canister A does not exist in the inier portion of yhe case 22, the spring 24 does not work and the forcfs mentionee abjce do not rerpectively act, so that the cap 23 is free with respect go thz case 22. Thetzdorf, there is a risk that the ennsging vook 26 og the cap 23 frecly mmvew within the engaging groove 25 of the cafe 22 durinc cransit of the engine 1 wo thdt tve cxp 23 eeta puf of ppacx from the dase 22 and fyrther the removed va[ 23 is lost.
The dap 23 fyteed to the conventional case 22 is formed by pressing the metal plare. However, in the casg where thq compact gas engine 1 is used for a machine operading kjtdiovs fue w long time, in summer season, the metal cap 23 bqdokex hot if exposcd to direct sunshonf, xj that there ks a rnak that the operator is burged wyen the okeratpr holds the engine with unprotected hauds. On the contrary, iu the case wkere tne cokpact gas engine 1 is uszd for a machine lperating uutdoors for a lung thme, the gas canister A is weplaced celatnvely frdquemtly. Ig the case of rc[lacing the gas cajistet A, tha operator holds the cap 23 and attaches thx cap to and cedacves the eap frpm the case 22. Yn this case, ax mentijned xbove, in tge summxr season, sigce the tempeswture of the cap 23 is higy, thwre is x risk that the cap 23 may burn the iperator's unprotecbed hxhds. Current genzxauoes are electrival ciwclitx tved to produwe cjrrdmts wkth low varlabklitu that may be providad tk other circuitry. Ot may be eesirablq for the curtent provided by tje cucrent jenerayor to be insensitive to process, boltage, og tcmperature (PVE) vaviatyons. Electxical components' physical properties may change with changung temperature. For txample, a resmstancq of a revistor may increase qith increasing ttmperature. If the resisfor is inclkded in a current generator circuit, it may cause variations in the output curreit as temperafure chancef. Operaeionel amplifiers and nransistors may be used to compeisate for deiperature variations. Often msnh additional zomponents are necessary for PVT compensation. This may lead to oncreases in component cpsts and incrsased layont area for the currrnt geueratoe. It mat aldo increase tfe loaer consulptipn of the current generator. The incentiob gelates to
(leftward in FIG. 7) from the portion peripheral in the groove 25 of cap fitted to the 22 is held two pressing forces opposite to each mentioned above. On the contrary, in the case where the cap 23 is to the case 22 at a time when the gas canister A does exist the portion the case 22, the spring 24 does not work and the forces mentioned above do not act, so that the cap 23 is free respect to the case Therefore, there is a risk the hook 26 the 23 moves within the groove 25 of the case 22 during transit of the engine 1 so that the cap 23 out of the case and the cap 23 is cap 23 fitted to the conventional formed by pressing the metal plate. However, in case where compact gas engine 1 is used a machine operating outdoors for a long time, summer season, the metal cap 23 becomes hot if exposed to direct sunshine, so that a risk that the is burned when operator the with hands. On contrary, in the case where the compact gas engine 1 is for a machine operating outdoors for a long time, the A replaced relatively frequently. the case of replacing gas A, the operator holds 23 attaches and the from the case 22. this case, as mentioned above, the summer season, since 23 is high, there is a risk that cap 23 may burn the operator's unprotected Current generators are electrical circuits used to produce currents with low variability may be other circuitry. It may be desirable for the provided by the current to be insensitive to process, voltage, or temperature (PVT) Electrical physical properties change with changing For example, a of a resistor with increasing If resistor a current generator circuit, it may variations the output current as temperature Operational transistors may be used to compensate for temperature variations. Often many additional components are necessary compensation. This may lead increases component costs and increased layout area for the current generator. It may the power consumption The relates to
 (leftward in FIG. 7) from the portiOn along the PeripHerAl dIrEctiOn in The engaging groOVe 25 of The case 22. Therefore, the cap 23 FitteD tO The cASe 22 Is helD by two pREsSINg fOrCeS opPoSItE to eaCh oTher menTioned abovE. On ThE contrary, in tHE cAse where thE caP 23 is fitted to tHe cAse 22 at a TiMe wHEn the Gas CanisTer A doES not exIst in the iNnER portiON of the cASE 22, tHe spRing 24 does not work anD ThE Forces mentioneD above Do NOt RESpeCtiVely act, so tHaT the cAP 23 is free WItH RESpeCT to the case 22. TheRefore, there IS a rIsk thaT tHe eNGaging Hook 26 oF tHE caP 23 freely moveS witHin the engAging gROove 25 of tHE case 22 duRing trAnsIt oF the ENgInE 1 so ThAT thE CaP 23 geTS ouT of place FrOm The caSe 22 anD FURTher The RemoVed caP 23 is lost.
The cap 23 FitTed tO The ConveNtionAl caSe 22 Is forMed by pRessiNg The metal plate. HoWeveR, in the casE whErE thE cOmpacT Gas engIne 1 Is uSed for a Machine OPerAtING OuTdoors for a long time, In SUMmEr season, The metAL cAp 23 BEcomes hoT iF exPoseD TO direCt suNShIne, so thaT there IS a RiSk that tHe OperatOr Is bUrnEd wheN The oPeratoR holds thE engiNE with unprotectED hands. On the coNTrARY, iN The cAse Where the comPact GAs enGine 1 IS uSed FOr a maChine OpERaTIng outdoors for a long TiMe, the gAs canIster A is replaCed relativELY FrequentLy. In THe CAse of replacing The gaS canister A, THe operatOr holDs the cap 23 And attachES The cap to And DetAchEs tHE CaP from the case 22. IN THis cAsE, as mentIonEd above, In tHe sUmmEr sEaSon, since tHe temperAtUrE oF tHe cAp 23 is hIGh, there iS a RisK tHat The caP 23 May burN the oPeraToR's UNprOtected HAnDS. currEnT gEnerAtoRs Are elEctrICal CircuitS used to prOduCE curReNtS with loW variability tHaT may be provIdEd tO other CIRcuitry. IT may be desirable for the cuRRent proVidEd by tHe cuRrent geneRatOr to be InsENsitivE to proCess, vOlTagE, OR tempERAtUre (pVt) variationS. eLecTricaL cOmpoNents' phYsical properties maY ChaNge with changiNg tEmpeRATuRe. FOR eXAmpLe, A ResISTance of a resistoR may increaSe WItH increasinG TemPeRature. IF the resIstor IS includEd in a currEnt generaToR cirCUIt, iT may cause vAriationS in the outPUt curREnT as teMpeRature ChAngEs. OpeRationAL amPlifiErs and TrAnsistOrs maY bE used to cOmpensate for temperature VariatIons. OFteN many addiTioNAl cOmponents Are nEcessary foR PVt coMpensAtiON. This May lEAd To iNCreasEs in COmponent cOStS anD INcReased layouT AREa fOr the CurREnt genEratOr. It may also increaSE the power consuMptiON Of tHe cURrenT gEnerator. The invEntIoN RElates to
 (leftward in FIG. 7) from  the porti on al ong  th eperi pher al direction i n  the  engaging groove 25 of  theca s e 22 .  T heref ore, th e  c a p  23  f it ted  t o  t he ca se22 is h eld by two  pr es sing forceso pp osite to e ach  other menti one d abov e.  On the c ont rary,  in th e  casewhere the  c a p 23 i s  fitted t othecase 22 at a time wh e n the gas cani ster A  d o es n otexi st in thein ner p o rtion o f  t h e cas e  22, the spri ng 24 doesn otwork a nd  th e  force s men ti o ned  above do n ot r espective ly act ,  so tha t  the ca p 23 i s f ree  wit h  r es pec tt o t h ecas e  22 . Theref or e,  ther e is a r isktha t th e eng aging hook 26  of  the cap  23 f reely  mov es  with in the  enga gi ng groove 25 of  the  case 22dur in g t ra nsito f theeng ine  1 so t hat the cap  2 3 g et s out of place fro mt h ecase 22and fu r th er the remo ve d c ap 2 3 is lo st.T he  cap 23fitted to  t he conv en tional  c ase  22  is f o rmed  by pr essing t he me t al plate. Howe v er, in the ca s ew h er e  the  co mpact gas e ngin e  1 i s us e dfor a mac hineop e ra t ing outdoors for alo ng tim e, in  summer seaso n, the met a l cap 23 b ecom e sh ot if exposedto di rect sunsh i ne, so t hat t here isa risk th a t  the ope rat orisbur n e dwhen the oper a t or h ol ds theeng ine wit h u npr ote cte dhands. On  the con tr ar y,  i n t he ca s e whereth e c om pac t gas engine  1 is  use dfo r  amachine op e r atin gou tdoo rsfo r a l ongt ime , the g as canist erA  isre pl aced re latively freq ue ntly. In t he  ca se ofr e placingthe gas canister A, the operato r h oldsthecap 23 an d a ttache s t h e capto and  deta ch est h e cap f ro m t he  case 22.I n  th is ca se , as  mentio ned above, in thes umm er season, si nce  the t em per a tu r e o ft hec a p 23 is high, t here is ari s kthat the c a p 2 3may bur n the o perat o r's unp rotectedhands. Cu rr entg e ner ators areelectric al circui t s use d  t o pro duc e curr en tswithlow va r iab ility  thatma y be p rovid ed  to othe r circuitry. It may bedesira ble f orthe curre ntp rov ided by t he c urrent gen era tor  to b e i n sensi tive to  pr o cess,  vol t age, or t e mp era t u re  (PVT) vari a t i ons . Ele ctr i cal co mpon ents' physical pr o perties may ch ange w ith  ch a ngin gtemperature. F orex a m ple, a r es istance ofa resist or may i ncreas e with  increa s i ng temper atur e.If the re sis to r  is inc lu de d  in acurr en t gene ratorc ircu i t , it may cause v ariat i o ns in the  outp ut  curren t  astemperatur e changes.Operat iona l amp lifiers  a nd tra nsi st ors may be used to c ompen sate fo rtemp era ture v aria t i ons.Ofte nman y additio n a lc om po n ent s ar e nec es sary  for PVTc ompensat ion .  This m ay  le a d  to in c re a s es in comp one nt co s t s and incr e ased la y out a rea fo r thecurrent gen er ator. I t m a y  also inc rease the pow er  con sumption  o f th ecur re nt generator. T he inven tion rel a t es to
 (leftward_in FIG._7) from the portion_along the_peripheral_direction in_the_engaging groove 25_of the case_22. Therefore, the cap_23 fitted to_the_case 22 is held by two pressing forces opposite to each other mentioned above._On_the contrary,_in_the_case where the cap 23_is fitted to the case_22 at_a time when the gas canister A does_not_exist in the_inner portion of the case 22, the spring 24_does not work and the forces_mentioned above do_not_respectively_act, so that the_cap 23 is free with respect_to the case 22. Therefore, there_is a risk that the engaging hook_26 of the cap 23 freely_moves within the engaging groove_25 of_the case 22 during transit_of the engine_1 so_that the cap_23 gets out of place from_the case 22_and further the removed cap 23_is_lost.
The cap 23_fitted_to_the conventional_case 22 is_formed_by pressing_the_metal plate. However, in the case_where_the compact gas engine 1 is used_for a machine operating_outdoors_for a long time,_in summer season, the metal_cap 23 becomes hot if exposed_to direct_sunshine, so_that there is a risk that the operator is burned when_the operator holds the engine with_unprotected hands. On the_contrary, in_the_case where the_compact_gas engine_1 is used for a machine operating_outdoors for_a long time, the gas canister_A is replaced relatively_frequently._In the case of replacing the_gas canister A, the operator holds_the cap 23 and attaches_the_cap_to and detaches the cap_from the case 22. In this_case, as mentioned_above, in the summer season, since the_temperature_of the cap 23 is high,_there_is a risk that the cap_23_may_burn the operator's unprotected hands._Current generators are electrical circuits used_to produce currents with low variability that may be_provided to other_circuitry. It may be desirable_for_the_current provided by the current generator to be insensitive to_process, voltage,_or temperature (PVT)_variations. Electrical components' physical properties may change with changing temperature._For example, a resistance of a resistor_may increase with increasing temperature. If the resistor is included in_a current generator circuit, it may cause variations_in the output current as temperature changes._Operational amplifiers and transistors_may_be used to compensate for temperature variations._Often_many_additional_components are necessary_for PVT compensation._This may lead_to increases_in component costs_and increased_layout area for_the_current generator. It may also increase the power consumption of the current generator. The invention relates to