Lub luag haujlwm ntawm cov teeb pom kev dub
Cov chav kawm tsis tau teeb tsa cov teeb tshwj xeeb rau cov pob zeb dub, lossis siv cov teeb fluorescent zoo tib yam raws li cov teeb pom kev hauv lub teeb, yog li feem ntau ntawm cov teeb tsis zoo siv rau lub blackboard, tab sis mus rau qhov chaw sab nraum lub blackboard. Nrog lub teeb pom kev tsis txaus rau ntawm daim ntawv teev npe dub thiab qhov nruab nrab qhov pom kev tsis zoo, cov tub ntxhais kawm tsis tuaj yeem pom dab tsi sau rau ntawm daim ntawv teev npe dub.
Tsis tas li ntawd, qhov dazzling glare los ntawm cov hlab fluorescent tuaj yeem ua rau nws nyuaj rau cov tub ntxhais kawm kom mloog zoo, uas tuaj yeem txo qhov kev kawm tau zoo thiab yooj yim ua rau mob qhov muag xws li myopia.
Lub teeb lub teeb dub rau cov chav kawm txawv. Blackboard teeb nrog asymmetric lub teeb faib cov yam ntxwv yog siv rau qhov projection, thiab kev npaj tsim nyog ntawm lub teeb pom kev zoo ua rau lub teeb ci ntawm tag nrho cov blackboard sib npaug. Thaum cov tub ntxhais kawm nyeem cov ntsiab lus sau rau ntawm daim ntawv teev npe dub, qhov kev pom pom tau zoo dua, thiab tsis muaj qhov muag pom.
Ntxiv nrog rau kev xaiv cov khoom siv teeb pom kev zoo, qhov chaw ntawm lub teeb lub teeb dub kuj tseem ceeb heev. Yog hais tias qhov chaw ntawm lub cuab yeej tsis haum, lub teeb pom kev ntawm blackboard tseem yuav muaj qhov tsis sib xws, kev xav, glare thiab lwm yam tshwm sim tsis zoo. Raws li" Txoj Cai Kev Nyab Xeeb rau Hnub Ci thiab Teeb Pom Kev Hauv Tsev Kawm Ntawv Qib Siab thiab Tsev Kawm Ntawv Qib Siab-GB-7793-2010",
Lub teeb pom kev ntawm blackboard yuav tsum ua cov hauv qab no:
1) Txhawm rau tiv thaiv qhov cuam tshuam ntawm qhov pom ntawm cov tub ntxhais kawm, txoj haujlwm teeb tsa ntawm lub teeb lub teeb dub yuav tsum yog: thawj kab ntawm cov tub ntxhais kawm pom cov ntawv saum toj kawg nkaus, thiab siv qhov kev pom no los cuam tshuam rau lub qab nthab kom tau txais cov duab kos. duab taw tes ncua sij hawm L1, thiab siv lub dot P thiab sab saum toj ntawm lub blackboard raws li ib tug dotted kab Thaum txuas, lub teeb yuav tsum tau muab ntsia rau hauv cheeb tsam saum toj no lub dotted kab txuas.
2) Lub teeb yuav tsum tsis txhob teem rau qhov twg tus kws qhia ntawv sawv hauv qhov siab ntawm 45 ° ntawm qhov chaw saib ntawm lub podium, uas yog, qhov kev ncua deb ntawm lub teeb thiab lub blackboard yuav tsum tsis txhob ntau tshaj L2.
3) Txhawm rau kom ntseeg tau qhov nruab nrab qhov nruab nrab ntawm lub pob zeb dub, lub teeb axis ntawm lub teeb yuav tsum zoo dua yog qhov teeb meem ntawm kab nruab nrab ntawm lub blackboard ntawm 55 °, lossis qhov taw tes taw ntawm qhov muag pom ntawm lub teeb yuav tsum tau tsiv mus rau hauv qab 1/3 ntawm lub caij nyoog blackboard.
