| 摘要 |
There is provided a diffractive multifocal lens, wherein a diffraction phase structure of a diffraction pattern has a structure expressed by the following formula:φ (ξ) = { p 1 ξ, 0≤ξ< w p 2 (ξ- 0.5 ) - q π, w≤ξ< 1 - w p 1 (ξ- 1 ) , 1 - w≤ξ≤1 ( 1 ) whereinξindicates a position in a radial direction of the lens in one period of the diffraction pattern, andφ(ξ) indicates a value (radian) of a phase shift amount of light passing through the position ofξfrom the phase of light passing through a reference plane.
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