| 摘要 |
PURPOSE: Even when being composed of the plastic lens, 3 each taking lens tellingly uses aspherical as the little number of lens element. The lens system high-end and which is very compact can be realized. CONSTITUTION: A first optic, and the second lens and the third lens(L3) are in order arranged from the object side. The convex surface of the first optic has the positive power facing the object side. The concave surface of the second lens in other words has the power of the negative principle in nature as if it faces the object side. The third lens has the power of 0. The aspherical of the third lens has one or a plurality of curve change points. |
