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

1975-05-07

1977-06-07

Sacher, Paul A.

350175NG, G02B 304

Patent

active

040279529

ABSTRACT:
The invention relates to single lenses with large aperture and large field.
The paraxial parameters of a lens with spherical refractive surfaces are selected in advance. 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.

REFERENCES:
patent: 2388118 (1945-10-01), Burch
patent: 2719235 (1955-09-01), Emerson
patent: 3486825 (1969-12-01), Howland
patent: 3877792 (1975-04-01), Cox et al.

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