| 摘要 |
<p>Optical structures are disclosed that comprise selected combinations of refractive and diffractive type optical elements wherein net chromatic aberrational effects are minimized in images formed by said structures. With the disclosed structures, chromatic aberrational contributions from each type of optical element, having characteristically opposite algebraic sense, are essentially cancelled out by means of proper distribution of optical power plus suitable arrangement and relative location of the said optical elements. Advantages over the prior art are demonstrated in four general types of optical structures. <IMAGE></p> |
