Zoom lens
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United States of America Patent
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-
May 6, 1997
Grant Date -
N/A
app pub date -
Jun 13, 1995
filing date -
Jun 13, 1995
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An improved zoom lens for use in projective image forming systems is disclosed. It comprises, in the order from the object side to the image side, a first lens group with a negative refractive power, a second lens group with a positive refractive power, a third lens group with a negative refractive power, and a fourth lens group with a positive refractive power. The lens groups are disposed such that, during the zooming operation from the wide-angle mode to the telephoto mode, the first, second, and third lens groups are simultaneously moving toward the object side and the fourth lens group stays stationary, and that the first and third zoom lens groups are provided such that the following condition is satisfied: 1.6
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