Bifocal multiorder diffractive lenses for vision correction
First Claim
1. A multiorder diffractive optical element comprising:
- a body having two or more multiorder diffractive structures providing different optical powers in which each one of said diffractive structures directs light in a plurality of different wavelengths in different diffractive orders to a single focus in accordance with the optical power of each one of each diffractive structures.
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Abstract
A bifocal multiorder diffractive lens having a lens body with one or more first regions having a first multiorder diffractive structure providing near vision correction, and one or more second regions having a second multiorder diffractive structure providing distance vision correction, in which the lens defines an aperture divided between the first and second regions. The lens body may be provided by a single optical element or multiple optical elements. In other embodiments, a bifocal multiorder diffractive lens is provided by a single or multiple element lens body having a multiorder diffractive structure for distance vision correction and one or more refractive regions to add power for near vision correction, or a single or multiple element lens body shaped for refractive power for distance vision correction and a multiorder diffractive structure for add power for near vision correction. Multiorder diffractive structures may be optimized for photopic and scotopic vision.
206 Citations
46 Claims
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1. A multiorder diffractive optical element comprising:
a body having two or more multiorder diffractive structures providing different optical powers in which each one of said diffractive structures directs light in a plurality of different wavelengths in different diffractive orders to a single focus in accordance with the optical power of each one of each diffractive structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
- 35. A multiorder diffractive optical element comprising a body having two or more diffractive structures providing different optical powers in which each of said diffractive structures directs light in a plurality of different wavelengths to a single focus, wherein one or more of said diffractive structures is in accordance with wavelengths for both photopic and scotopic vision, and said photopic and scotopic vision each have a wavelength of peak efficiency, and the wavelength of peak efficiency for each of said photopic and scotopic vision aligns with a wavelength of peak efficiency for each of said diffractive structures.
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41. A multiorder diffractive optical element comprising:
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two or more multiorder diffractive structures each having an optical power in which at least two of said diffractive structures have different optical powers; and
each of said two or more diffractive structures directs light in different diffractive orders to a single focus, and said single focus of each of said two or more diffractive structures is in accordance with their respective optical power. - View Dependent Claims (42, 44, 45, 46)
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43. The optical element according to claim 43 wherein each of said two or more multiorder diffractive structures comprises a plurality of zones which define zone boundaries at which light incident on the diffractive structure experiences an optical phase shift, and which diffract light of different wavelengths in different diffractive orders, m, such that m≧
- 1 to the single focus for the diffractive structure.
Specification