Cząsteczki fotochromowe mają, w normalnych warunkach, kształt, który czyni je przezroczystymi. Podczas pochłaniania światła ultrafioletowego ich kształt zmienia się, struktura molekularna otwiera się i pochłania światło widzialne. Dwie formy cząsteczki fotochromowej - otwarta i zamknięta - istnieją w równowadze w połączeniu, które jest nieustannie łamane i odbudowane.
Cząsteczka fotochromowa stale przełącza się między stanami przezroczystym i ciemnym. Jeśli soczewka jest narażona na znaczące poziomy światła UV, większość cząsteczek będzie w stanie otwartym, przyciemniając soczewki. W przypadku braku światła UV, cząsteczki pozostaną zamknięte, w wyniku czego soczewki są przezroczyste.
Neochromes, najnowocześniejsze soczewki technologiczne wydają się naturalne i stają się drugą naturą dla użytkownika.
Przed ekspozycją na światło UV soczewki znajdują się w najbardziej przezroczystym stanie.
Gdy soczewka jest po raz pierwszy wystawiona na promieniowanie UV, cząsteczki fotochromowe zaczynają się zmieniać z przezroczystych na zaciemnione.
Soczewki znajdują się w fazie szczytowej aktywacji. W tym stanie można ocenić transmisję światła, aktywowaną barwę i jednorodność koloru.
Szybkie rozjaśnianie ma kluczowe znaczenie. Zaczyna się, gdy promieniowanie UV nie pada już na soczewkę. Im krótszy czas rozjaśniania, tym soczewka jest wygodniejsza i funkcjonalniejsza dla użytkownika
Zachowanie /
Neochromes
Temperatura i jej wpływ na technologię fotochromową
Temperatura ma wpływ na każdą soczewkę fotochromową. W niskich temperaturach soczewki fotochromowe ciemnieją bardziej i ich rozjaśnianie zajmuje więcej czasu. W cieplejszych temperaturach soczewki nie ciemnieją tak bardzo i nie blakną szybciej. Jest to cecha stanu równowagi w układzie fotochromowym.
W soczewkach Neochromes szczególną uwagę zwraca się na działanie w wysokich temperaturach. W wysokich temperaturach (33°C) osiągają funkcjonalną ciemność podobną do wielu soczewek polaryzacyjnych.
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