| 摘要 |
The system composed of three mono lenses, is especially used for f- theta scanning lens of rotating mirror type deflector in laser application optical devices. Refrective indices of each of lenses are K1, K2, K3 and distances between lenses are e1, e2. When condition is K1<0, K2<0, K3<0, the system satisfies the following formaula of - 0.08446<= e1K1-e2K2 <= 0.03990.
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