Micro zoom lens

Details Micro zoom lens Micro zoom lens

1988-12-19

1990-03-27

Dzierzynski, P. M.

350450, G02B 1514

Patent

active

049115391

ABSTRACT:
A zoom lens comprises a first lens group having a positive refractive power and a second lens group having a negative refractive power sequentially from an object to be photographed. The first lens group comprises an aperture, a front group including at least two lens components having a positive refractive power, and a lens component which has a negative refractive power and an object-side lens surface of which has a concave surface directed toward an object side, and a rear group located nearer to an image than the aperture and including at least one lens component having a positive refractive power. The front group is located nearer to the object than the aperture and has a positive refractive power as a whole. The second lens group comprises at least one lens component having a positive refractive power and at least two lens components having a negative refractive power. A relative distance between the first and second lens groups is changed to perform zooming.

REFERENCES:
patent: 4682860 (1987-07-01), Tanaka et al.
patent: 4838669 (1989-06-01), Ogata et al.

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