Zoom lens system capable of shifting an image and compensating b

Details Zoom lens system capable of shifting an image and compensating b Zoom lens system capable of shifting an image and compensating b

1995-09-29

1998-08-04

Nelms, David C.

Optical: systems and elements

Image stabilization

By movable refractive structure

359684, 359685, 359691, 359692, G02B 2764, G02B 1514

Patent

active

057903093

ABSTRACT:
A zoom lens system in which the back focus variations that accompany the movement of a shift lens unit can be compensated. During image shifting, the shift lens unit can be moved in a direction substantially perpendicular to an optical axis in order to shift an image. The shift lens unit also moves a small amount along the optical axis, thereby creating a back focus variation. A focusing lens unit is provided that moves along the optical axis to compensate for the variations in the back focus created by the shift lens unit during image shifting. A variation amount of the spherical aberration for the highest marginal rays at each focal length condition, when the shift lens unit undergoes a small change in position along the optical axis, divided by the amount of movement of the shift lens unit in the perpendicular direction is less than zero and greater than negative one. Additionally, the absolute value of the focal length of the lens units, from the lens unit nearest the object side to the shift lens unit, divided by the focal length of the entire lens system is greater than 0.25 and less than 0.8.

REFERENCES:
patent: 5168403 (1992-12-01), Umeda et al.
patent: 5502594 (1996-03-01), Suzuki et al.
patent: 5530589 (1996-06-01), Sato
patent: 5559635 (1996-09-01), Sato
patent: 5598299 (1997-01-01), Hayakawa

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