Lens system

Abstract

Abstract PURPOSE:To use a blank material which can be easily produced and to allow the well correction of chromatic aberrations by combining a specific radial type heterogeneous lens and diffraction type lens. CONSTITUTION:The lens system formed by combining the radial type heterogeneous lens of the refractive index changing in the direction perpendicular to the optical axis and the diffraction type lens is formed to satisfy the conditions of equation I. In the equation, v0 is the Abbe number of the base of the radial type heterogeneous lens; v1 is the Abbe number by the second order coefft. of the radial type heterogeneous lens; psiG is the refracting power of the radial type heterogeneous lens; psiD is the refracting power of the diffraction type lens. The power of the radial type heterogeneous lens is decreased and the n is decreased by apportioning the power to the diffraction type lens and utilizing the chromatic aberration correcting power thereof. The blank material which can be easily produced is thus obtd. and the aberrations are well corrected.

Inventors

• 👤 Hirobumi Tsuchida
• 👤 博文 槌田

Bibliographic Details