Diffractive multi-focal lens and method for manufacturing diffractive multi-focal lens
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United States of America Patent
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Aug 18, 2020
Grant Date -
Aug 10, 2017
app pub date -
Aug 8, 2014
filing date -
Aug 8, 2014
priority date (Note) -
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Abstract
A diffractive multi-focal lens having a diffractive structure comprising a plurality of concentric circular zones, wherein: at least a portion of the diffractive structure is provided with an overlapping region in which at least two zone profiles overlap in the same region; in the overlapping region, at least a portion of a first zone profile has a zone pitch represented by a prescribed equation, and at least a portion of a second zone profile has a zone pitch represented by another prescribed equation; and an addition power P1 given by the first zone profile and an addition power P2 given by the second zone profile are determined by a prescribed relational expression, in which a and b are mutually different real numbers, and a value of a/b cannot be expressed by a natural number X or by 1/X.
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