Automotive sab nrauv rearview daim iav lo ntsiab muag yog tsim los ntawm ob pawg ntawm cov ntaub ntawv: iav thiab yas. Cov ntaub ntawv iav feem ntau muaj ntau dua 70% silicon dioxide; hom hom-xws li cov iav txheem, tempered iav, thiab ultra-kub- iav tiv thaiv- muab cov yam ntxwv sib txawv thiab muab qhov pom tseeb ntawm sab nraub qaum. Cov ntaub ntawv yas, xws li polycarbonate (PC) thiab polymethyl methacrylate (PMMA), muaj qhov zoo xws li lub zog siab, tawg tsis kam, thiab lub teeb yuag. Tsis tas li ntawd, cov khoom siv tshwj xeeb yog siv, xws li cov coatings reflective (nyiaj, aluminium, los yog chromium) thiab nanomaterials.
Cov iav txheem yog pheej yig thiab muab qhov tseeb - rau - lub neej saib ntawm lub nraub qaum, tab sis nws yog qhov tsis yooj yim thiab muaj kev nyab xeeb zoo. Tempered iav yog dav siv nyob rau hauv niaj hnub tsheb; nws tawg mus rau hauv me me granules, txo qhov kev pheej hmoo ntawm kev raug mob rau cov neeg nyob. Ultra-kub- iav resistant yog ua hauj lwm nyob rau hauv siab - kev ua tau zoo los yog cov qauv khoom kim heev, tswj kev ruaj ntseg txawm nyob rau hauv siab - qhov kub thiab txias ib puag ncig.
Polycarbonate (PC) boasts siab zog thiab toughness, yog shatter -resistant thiab hnav, thiab muaj zoo pob tshab thiab UV kuj. Polymethyl methacrylate (PMMA)-tseem hu ua acrylic los yog "organic iav"- muab cov pob tshab tshwj xeeb thiab muaj kev cuam tshuam zoo, ua rau nws yog ib qho kev xaiv rau cov ntawv thov ua ntej kom pom tseeb thiab qhov hnyav.
Reflective coatings ua los ntawm cov nyiaj, txhuas, los yog chromium muab cov yam ntxwv tshwj xeeb rau daim iav lo ntsiab muag. Silver coatings muab kev xav tau zoo heev, tso cai rau cov neeg tsav tsheb kom pom tseeb ntawm thaj chaw tom qab lub tsheb. Aluminium coatings muab ob qho tib si zoo reflectivity thiab siab durability. Chromium coatings muab qhov txawv ntawm qhov muag pom thiab zoo heev los tiv thaiv -glare zog, txo kev cuam tshuam los ntawm lub teeb hnyav.
Nrog rau kev txhim kho thev naus laus zis, nanomaterials kuj tau siv rau sab nrauv rearview daim iav lo ntsiab muag. Cov ntaub ntawv no txhim kho cov khoom xws li khawb tiv thaiv, ua rau cov lo ntsiab muag ntev dua. Qee lub tsheb khoom kim heev siv lo ntsiab muag ua los ntawm siab -refractive-index iav lossis yas; Piv txwv li, qee cov qauv Porsche muaj cov iav me ntsis convex iav lo ntsiab muag uas suav nrog cov ntaub ntawv electrochromic-uas tsaus ntuj thaum siv los muab cov tshuaj tiv thaiv- glare effect-nrog rau cov cua kub sib xyaw rau defrosting thiab defogging. Nyob rau hauv cov ntsiab lus, daim iav iav siv nyob rau hauv tsheb sab nrauv rearview iav los ntawm ntau yam ntaub ntawv, txhua tus muab tshwj xeeb zoo thiab kev siv. Kev siv cov khoom sib txawv no tsis yog tsuas yog txhim kho kev nyab xeeb ntawm kev tsav tsheb, tab sis kuj ua rau muaj kev xav tau ntawm ntau hom tsheb thiab cov neeg siv khoom, ua rau kev tsav tsheb zoo dua thiab yooj yim dua.