Optical system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Nov 13, 2001
Issued Date -
N/A
app pub date -
Nov 30, 2000
filing date -
Jun 3, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A zoom optical system provides a series of lens units designed to allow for zooming with minimal change in aberration resulting from the movement of the lens units. Each lens unit has a plurality of lens units. One embodiment has, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power wherein the second lens unit may have at least one gradient index lens element and the first lens unit is kept stationary during a change of magnification. Additional embodiments have more or fewer lens units and the refractive power of each lens unit is varied. In some embodiments, a lens unit other than the first lens unit is kept stationary.
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