Single optical lens with large aperture and large field

Details Single optical lens with large aperture and large field Single optical lens with large aperture and large field

G - Physics

02

B

88/99

G02B 3/04 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1043606

ABSTRACT 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 in- vention may be employed in heads for reading audio or video information on rotary record carriers.

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