Multi-focusing lenses having multiple waveplate
AssigneeIucf-Hyu (Industry-University Cooperation Foundation Hanyang University)
InventorsSeok Ho Song, Seung Min Lee
Life of this patent
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Abstract
Disclosed is a multifocal lens having multiple waveplates. More particularly, the multifocal lens having multiple waveplates includes a lens having an incident surface and an opposite surface thereof, and two or more waveplates disposed on the lens in a direction of the same axis of the lens and made of a birefringent material, wherein, in phase distribution of the waveplates, a location where a focal point is formed changes as a phase section (X) between a center of the lens and a point where a phase rapidly changes, wherein, in the same phase section (X) between neighboring first and second waveplates, a phase at the second waveplate decreases when a phase at the first waveplate increases.
Claims13
A multifocal lens having multiple waveplates, the multifocal lens comprises:
- a lens having an incident surface and an opposite surface thereof;
- and
- two or more waveplates disposed on the lens in a direction of a central axis of the lens and made of a birefringent material,
- wherein, in phase distribution of the waveplates, a location where a focal point is formed changes as a phase section (X) between a center of the lens and a point where a phase rapidly changes,
- wherein, in the same phase section (X) between neighboring first and second waveplates, a phase at the second waveplate decreases when a phase at the first waveplate increases, and
- wherein a number of focal points generated by the lens and the waveplates is calculated by Equation 1 below:
- N=4×2m-1−1 <Equation 1>
- where N represents the number of focal points, and m represents a number of waveplates.
Dependencies are inferred from the claim text.