Projection objective with fixed focal length for digital projection
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United States of America Patent
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May 5, 2009
Grant Date -
Jan 17, 2008
app pub date -
Jun 21, 2007
filing date -
Jun 22, 2006
priority date (Note) -
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Abstract
A projection objective having a fixed focal length for digital projection includes the following arrangement of the lenses in the sequence from the image (enlargement side) to the object (reduction and illumination side): a first, negative lens, a second, negative lens, a third lens, a fourth, positive lens, a fifth lens, a sixth, positive lens, a seventh, negative lens, an eighth, positive lens, and a ninth, positive lens. By means of such an objective, the quality requirements in the field of digital projection can be met with a minimal number of lenses.
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