| 摘要 |
<p>The invention relates to single lenses with large aperture and large field. A method enables the paraxial parameters of a lens with spherical refractive surfaces to be selected in advance. Subsequently, the lens aberrations are corrected in such a way by aspherization of the refractive surfaces, that the wave front aberration which is expanded in a series as a function of the aperture, at least contains sixth-degree terms. The invention may be employed in heads for reading audio or video information on rotary record carriers.</p> |
