Optical: systems and elements – Lens – With graded refractive index
Patent
1998-06-02
2000-12-19
Sugarman, Scott J.
Optical: systems and elements
Lens
With graded refractive index
359678, 359680, 359686, 359689, 359691, 359781, G02B 300, G02B 1514, G02B 934
Patent
active
061634107
ABSTRACT:
A zoom optical system is disclosed. The 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. To achieve this goal each lens unit is has a plurality of lens units. By way of example, one embodiment of the present invention 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 comprises at least one gradient index lens element and the first lens unit is kept stationary during a change of magnification. Additional embodiments are described in which more or fewer lens units are used 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. In several embodiments a graded index lens element makes up part or all of one or more of the lens units.
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Lester Evelyn A.
Olympus Optical Co,. Ltd.
Sugarman Scott J.
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