Kwicandelo lokuvelisa izinto ezintsha, uyilo lweelensi luhlulwe kakhulu kwiindidi ezimbini: oluyi-spheric noluyi-aspheric. Iilensi ze-aspheric, eziqhutywa kukufuna ubuncinci, zifuna utshintsho kwi-lens curve, oluhluke kakhulu kwi-spheric lens surface curve yendabuko. Uyilo oluyi-spheric, olwaluqhelekile ngaphambili, lwaluneengxaki zokwanda kokuguquguquka kunye nokuphazamiseka. Oku kwakusoloko kukhokelela kwiingxaki ezicacileyo ezifana nemifanekiso engacacanga, umbono ogoso, kunye nebala elilinganiselweyo lembono.
Ngoku, uyilo olufana ne-aspheric luye lwavela njengamandla okulungisa, lujongana nokuphazamiseka kokubona ngokufanelekileyo kwaye lubonelela ngesisombululo esibonelela ngeelensi ezingakhaphukhaphu kuphela kodwa ezincinci kodwa ezithe tyaba ngokulinganayo. Okubalulekileyo kukuba, olu phuculo aluyiphazamisi impembelelo ebalaseleyo yeelensi, nto leyo eqinisekisa amava okunxiba akhuselekileyo.
Iilensi zemveli ezingqukuva zineengxaki eziphawulekayo – izinto ezijongwa ngeenxa zonke zelensi zibonakala zigqwethekile, nto leyo ethintela umbono womntu onxibe. Kwixesha apho ubuchwepheshe buqhubeka butshintsha, iilensi ezingqukuva – ummangaliso wokwenyani – zinciphisa ukugqwetheka komphetho welensi, zikhulisa kakhulu umbono ukuze zihlangabezane neemfuno zabathengi. Iilensi ezingqukuva zinegophe elithe tyaba kwaye zilula, ziphucula umtsalane wendalo nobuhle. Ingakumbi kwiimeko zamandla aphezulu okurhabaxa, zinciphisa ukugqwetheka kwamehlo ngobuchule, zizenze zibe lukhetho olufanelekileyo kubathengi abaneemfuno eziphezulu zomyalelo.
Eyona nto ibalulekileyo kwiilensi ze-aspheric kukugoba kwazo okungaqhelekanga kumphezulu. Olu yilo lwe-aspheric luneengenelo ezininzi kuneelensi zendabuko ze-spheric:
1.Ukucaca: Iphathwe ngenkqubo ekhethekileyo yokugquma, iilensi ze-aspheric zibonelela ngokusebenza okubonakalayo okungumzekelo, okuqinisekisa amava okubukela acacileyo nakhululekileyo.
2. Intuthuzelo: Ilula kakhulu kangangokuba ayibonakali, iilensi ze-aspheric zinciphisa 'ubunzima' emehlweni akho, nto leyo evumela ukuba anxibe kakuhle kwaye akhululeke.
3. Umbono Wendalo: Uyilo lwazo olungenasiphelo lunciphisa ukugqwetheka kombono, nto leyo ekhokelela ekuqondeni okunengqiqo nokuchanekileyo.
Xa kuthelekiswa iilensi ezingqukuva nezingqukuva zezinto ezifanayo kunye nemiyalelo, iilensi ezingqukuva zibonakala zithe tyaba, zincinci, kwaye zibonelela ngamava okubukela angokoqobo nakhululekileyo. Ukujonga imilo yokugquma kwelensi ngokuchasene nomthombo wokukhanya kubonisa ukuba ukukhanya okuvela kwiilensi ezingqukuva kudla ngokuba nzima ngakumbi (ngaphandle kweelensi ezinamandla aphezulu okurhabaxa); nangona kunjalo, iilensi ezingqukuva zibonisa ukugoba okukhulu ngenxa yokugoba okwahlukeneyo kumphezulu wazo.
Imiphetho engaphandle kweelensi zendabuko ezingqukuva ayibonakali nje ityebile kodwa ikwajika kwaye ijije umbono wezinto, into eyaziwa ngokuba yi-image aberration. Ukuze kufezekiswe uyilo olukhaphukhaphu, kuye kwasetyenziswa izixhobo eziphezulu zokurhawuzelela ekwenzeni ilensi. Ngaphezu koko, xa zijongwa ngeelensi ezingqukuva, imilo yobuso bomntu onxibeyo ijijekile ngokubonakalayo. Iilensi ze-Aspheric, ngokwahlukileyo, zinciphisa ubukhulu bombindi nomphetho, nto leyo ebangela ilensi encinci esusa ukujijeka kwe-peripheral, ngaloo ndlela inika amava okubona kwendalo.
Iilensi ze-Aspheric zibonelela ngebala elibanzi neligobileyo lombono emaphethelweni, kunye nokutshintsha okuncinci komfanekiso, okwenza imifanekiso ibe yendalo kakhulu. Ezi lensi zinzima ngokuphindwe kathathu kunee-spheric ezifana nazo, nto leyo eyenza ukuba zifaneleke ngakumbi kubantu abancinci abazinxibayo. Ngomyalelo ofanayo we-5.00DS, iilensi ze-aspheric zikhaphukhaphu ngama-26% kuneelensi ze-spheric. Umphezulu wazo othe tyaba uqinisekisa umbono wendalo, ongaguqukiyo wehlabathi, kufutshane nakude, nto leyo enciphisa ukudinwa kwamehlo ixesha elide.
Zilungele abo banxiba iiglasi zamehlo okokuqala, ingakumbi abafundi kunye nabasebenzi baseofisini, iilensi ze-aspheric zinciphisa kakhulu ukungonwabi kokuqala okunxulunyaniswa nokunxiba iiglasi. Zikwayindlela engcono kakhulu kubasebenzisi beelensi zoqhagamshelwano, zisebenza njengeengubo zamehlo zokuxhasa ekhaya. Iilensi ze-aspheric zifana kakhulu nombono wendalo, ngokufana namava eelensi zoqhagamshelwano. Zifanelekile kwabo bakhetha ukungawunaki umyalelo ophezulu, abanqwenela ukuphepha ukubonakala kwamehlo amancinci ngeeglasi ze-myopia, abafuna ukunciphisa ubunzima beelensi zabo, okanye abaneemfuno ezahlukeneyo zokujonga iliso ngalinye.
Iilensi ze-Aspheric zinokwenza iilensi ze-medium refractive index zibukeke zincinci kwaye zithe tyaba njengeelensi ze-high refractive index, zinciphisa ukuguquguquka komphetho kwaye zilungele intsimi ebanzi yombono eyanelisa zonke iimfuno zabathengi.
Ixesha leposi: Jan-04-2024