Bifocal mirror

Kana kugadziridzwa kweziso remunhu kwakadzikira nekuda kwezera, anofanirwa kugadzirisa chiono chake zvakasiyana kune chiono chiri kure uye chiri pedyo. Panguva ino, anowanzoda kupfeka magirazi maviri ega ega, izvo zvisingaite. Naizvozvo, zvinodikanwa kukuya maviri akasiyana refractive masimba pane imwechete lens kuti ave lenzi munzvimbo mbiri. Malenzi akadaro anodaidzwa kuti bifocal lenses kana bifocal glasses.

Type
Split type
Ndiyo yekutanga uye yakapusa mhando yebinocular lens. Mugadziri wayo anowanzo zivikanwa seAmerican mukurumbira Franklin. Malenzi maviri emadhigirii akasiyana anoshandiswa kuparadzanisa rudzi bifocal girazi, iro rinoshandiswa senzvimbo dziri kure uye dziri padyo nenzvimbo yepakati. Iyi nheyo yakakosha ichiri kushandiswa mune ese maviri-magirazi magadzirirwo.

Gluing mhando
Namadza iyo sub-firimu pane iyo huru firimu. Iyo yekutanga chingamu yaive yekuCanada cedar gum, iri nyore kunama, uye inogona zvakare kunama mushure mekunge rabha yashatiswa nemakanika, kupisa uye kemikari. Mhando ye epoxy resin ine mashandiro arinani mushure mekurapa kwe ultraviolet zvishoma nezvishoma yakatsiva yekutanga. Iyo glued bifocal girazi inoita kuti dhizaini fomu uye saizi ye sublayer iwedzere kusiyanisa, kusanganisira iyo yakadhayiwa sublayer uye prism control dhizaini. Kuti uite kuti muganhu urege kuonekwa uye wakaoma kuonekwa, chidimbu-chidimbu chinogona kuitwa mudenderedzwa, ne optical center uye geometric center inopindirana. Waffle type bifocal mirror igirazi rakanamirwa bifocal. Mupendero unogona kuitwa wakanyanya kutetepa uye wakaoma kusiyanisa kana iyo sub-chidimbu ichigadziriswa pane yenguva pfupi inotakura muviri, nekudaro ichivandudza chitarisiko.

Fusion mhando
Iko kusanganisa iyo lens zvinhu neiyo yakakwira refractive index munzvimbo yeconcave pane hombe hombe pakupisa kwakanyanya, uye iyo refractive index yeplate huru yakaderera. Wobva wamhanya mukati meiyo sub-chidimbu kuti curvature ye-sub-piece surface ienderane neiyo yechikamu chikuru. Hapana pfungwa yekutara. Kuverenga kwekuwedzera A kunoenderana nesimba refractive F1 yepamberi penzvimbo iri kure yekuona, iyo curvature FC yepakutanga concave arc uye fusion ratio. The fusion ratio hukama hunoshanda pakati peiyo refractive index yezviviri phase fusion lens zvinhu, apo n inomiririra refractive index yegirazi huru (kazhinji girazi rekorona) uye ns inomiririra refractive index ye sub-sheet (flint girazi) ne. kukosha kukuru, kozoti fusion ratio k=(n-1) / (nn), saka A=(F1-FC) / k. Zvinogona kuoneka kubva pane iri pamusoro fomula kuti mudzidziso, kushandura kumberi kwepamusoro curvature yendiro huru, iyo concave arc curvature uye sub-plate refractive index inogona kushandura iri pedyo yekuwedzera dhigirii, asi muchokwadi, inowanikwa nekuchinja. iyo sub-plate refractive index. Tafura 8-2 inoratidza refractive index ye sub-sheet flint girazi rinowanzoshandiswa munyika kugadzira akasiyana-akawedzera fusion bifocal magirazi.

Tafura 8-2 Refractive index ye-sub-plates akasiyana-siyana ari pedyo-akawedzera fusion bifocal magirazi (flint girazi)