Zoom lens

Details Zoom lens Zoom lens

1993-03-05

1994-06-14

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359691, 359677, G02B 1514

Patent

active

053215532

ABSTRACT:
In a zoom lens having a lens unit of negative refractive power most adjacent to the object side, distortion can be corrected better and an excellent imaging performance is maintained. In a zoom lens having a lens unit of negative refractive power most adjacent to the object side, a negative lens whose image side surface in contact with air is formed by a concave surface is provided in the lens unit of negative refractive power, and the shape of the concave surface of the negative lens is made into an aspherical surface which satisfies the condition that -5<.kappa.<0.75 with regard to a cone constant .kappa. and of which the curvature monotonically decreases away from the optical axis.

REFERENCES:
patent: 4159865 (1979-07-01), Kawamura et al.
patent: 4400064 (1983-08-01), Ikemori et al.
patent: 4999007 (1991-03-01), Aoki et al.
patent: 5046833 (1991-09-01), Tsuchida
patent: 5054897 (1991-10-01), Ozawa
patent: 5076677 (1991-12-01), Sato
patent: 5155629 (1992-10-01), Ito et al.

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