採用繞射/折射複合透鏡之十倍光學變焦鏡組的設計

Abstract

本論文包含了二個部份，第一部分中，我們設計了一組應用在數位相機系統的十倍光學變焦鏡頭。 繞射元件具有材質輕薄、容易複製及符合經濟效益的特點，它也具有一般折射透鏡的成像功能。結合繞射元件及折射元件的複合型透鏡，可以用來消除許多像差，所以採用複合透鏡，可使系統的重量減輕，減少系統所需的片數，本論文便利用繞射元件的優勢，成功的僅以四片複合非球面鏡和二片玻璃球面鏡來達到十倍變焦的功能，構成緊湊的光學結構。 本論文的第二部份，另外針對一組含複合透鏡，變倍比為三倍的鏡組，量測其光學特性，發現含繞射元件的系統，在製作及組裝上較只有折射元件的系統，必須有較高的精密度，才可完全發揮繞射元件的功能。

This thesis contains two parts. In the first part, we design a 10X zoom lenses which can be used camera system. The diffractive lens is characteristic of thinness and lightness, and costs effectively. The diffractive lens has the same imaging function as refractive lens. The hybrid lens which contains the diffractive lens formed on a surface of refractive lens can eliminate more aberrations, and decrease the volume and weight. With the advantage of the diffractive device, we accomplish the compact 10X zoom system which is made of four hybrid-aspheric lenses and two spherical lenses. In the second part, we measure the optical performances of a 3X zoom lens made of hybrid lenses. From the measured results, we find that for a hybrid system (including diffractive components) the centering, aligning and packaging are required to be made more accurately than a pure refractive system in order to get good performance.