Diffracting optical element, and optical system and optical apparatus having the same
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United States of America Patent
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Jan 17, 2006
Grant Date -
Nov 7, 2002
app pub date -
Mar 6, 2002
filing date -
Mar 6, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A diffracting optical element has a structure that a plurality of layers having a periodic relief pattern varying in height in a period are laminated in proximity to or close contact with each other. The diffracting optical element includes two layers equal in the height of the relief pattern and opposite to each other in the direction in which the height of the relief pattern varies in a period, and another layer differing in the height of the relief pattern from the two layers. Materials forming the three layers differ in dispersion from one another.
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