Retrofocus type wide angle lens

Details Retrofocus type wide angle lens Retrofocus type wide angle lens

1985-10-03

1987-09-01

Corbin, John K.

G02B 964, G02B 1304

Patent

active

046905170

ABSTRACT:
A retrofocus type wide angle lens has, in succession from the object side, a first component which is a positive meniscus lens having its convex surface facing the object side, a second component which is a negative meniscus lens having its convex surface facing the object side, a third component which is a negative meniscus lens having its convex surface facing the object side, a fourth component having a cemented surface of negative refractive power convex toward the object surface and having a negative refractive power as a whole, a fifth component which is a biconvex positive lens having a surface of sharper curvature on the object side, a sixth component which is a positive meniscus lens having its convex surface facing the image side, a stop, a seventh component which is a biconcave cemented negative lens comprising a positive meniscus lens having its convex surface facing the image side and a biconcave negative lens cemented thereto, an eighth component which is a positive meniscus lens having its convex surface facing the image side, and a ninth component which is a biconvex positive lens. The retrofocus type wide angle lens satisfies specified conditions.

REFERENCES:
patent: 4348085 (1982-09-01), Mogami

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