Retrofocus type lens system

Details Retrofocus type lens system Retrofocus type lens system

1989-03-17

1990-09-18

Sugarman, Scott J.

350458, G02B 1304, G02B 1318

Patent

active

049573551

ABSTRACT:
A retrofocus type lens system has a first lens group having a negative refracting power and a second lens group having a positive refracting power in the order named from an object side. The second lens group is constituted by a front group having a positive refracting power and a rear group which has a positive refracting power and is movable along an optical axis to have a focusing function. The rear group of the second lens group has an aspherical lens having at least one aspherical surface. The aspherical lens has a shape with which a negative refracting power is gradually increased from its vertex to its periphery.

REFERENCES:
patent: 3864026 (1975-02-01), Glatzel
patent: 3992085 (1976-11-01), Momiyama
patent: 4311367 (1982-01-01), Mori
patent: 4770512 (1988-09-01), Ikari

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