1989-07-28
1991-05-14
Arnold, Bruce Y.
G02B 936
Patent
active
050150790
ABSTRACT:
A copying lens system composed of a four-unit-four-element configuration including, in order from the object side, a first lens element of positive meniscus having a convex surface directed toward an object, a second lens element of negative meniscus having a convex surface directed toward the object, a third lens element of negative meniscus having a convex surface directed toward an image, and a fourth lens element of positive meniscus having a convex surface directed toward the image. In this configuration, the first lens element and the fourth lens element have the same geometric shape, and are disposed symmetrically with respect to a central diaphragm stop. The second and third lens elements also have the same geometric shape, and are also disposed symmetrically with respect to the central diaphragm stop. This provides an overall symmetrical configuration which can compensate for various aberrations.
REFERENCES:
patent: 2518719 (1950-08-01), Reiss
patent: 2865253 (1958-12-01), Thielens
Arnold Bruce Y.
Asahi Kogaku Kogyo Kabushiki Kaisha
Gass Rebecca D.
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