IMAGING OPTICAL DEVICE
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United States of America Patent
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Issued Date -
Feb 9, 2012
app pub date -
Aug 5, 2010
filing date -
Aug 5, 2010
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Abandoned
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Abstract
An imaging optical device includes a first lens group and a second lens group disposed in an order from the object side to the image side. The first lens group has a positive refractive power, and includes at least a first lens, a second lens and a third lens in an order from an object side to an image side. The third lens has a convex image-side surface. The second group has a negative refractive power and includes at least three lenses.
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