Method for manufacturing diffractive multi-focal ophthalmic lens and diffractive multi-focal ophthalmic lens

A diffractive multi-focal ophthalmic lens comprising

• a diffractive structure comprising a plurality of zones in a concentric circle form, the diffractive structure being capable of generating at least three focal points in an optical axis direction, wherein:
• the diffractive structure comprises a composite profile which includes a phase profile that is dividable into a plurality of starting profiles being overlapped each other, and for which radial direction positions of the respective zones are set according to the plurality of starting profiles,
• an adjusted profile is set for which at least one of the zones of the composite profile is a zone having a different phase and/or amplitude from an overlapping of the plurality of starting profiles,
• at least a portion of the phase of the adjusted profile is expressed as a blaze shaped function in relation to a lens radial distance,
• in the plurality of starting profiles, at least a portion of each phase is expressed as a blaze shaped function in relation to a lens radial distance, and
• the blaze shaped function is expressed by Equation 12
• ϕ
• ⁡
• (
• r
• )
• =
• ϕ
• i
• -
• ϕ
• i
• -
• 1
• r
• i
• -
• r
• i
• -
• 1
• ×
• r
• +
• ϕ
• i
• -
• 1
• ×
• r
• i
• -
• ϕ
• i
• ×
• r
• i
• -
• 1
• r
• i
• -
• r
• i
• -
• 1
• +
• τ
• [
• Equation
• ⁢
• ⁢
• 12
• ]
• r:
• Radial distance from the lens center
• ri−1:
• Inner diameter of the ith zone (radius)
• ri:
• Outer diameter of the ith zone (radius)
• ϕi−1:
• Phase at the inner diameter (radius) position of the ith zone
• ϕi:
• Phase at the outer diameter (radius) position of the ith zone
• τ:
• Phase shift.

A diffractive multi-focal ophthalmic lens set comprising a plurality of types of diffractive multi-focal ophthalmic lenses combined into a series, each of the diffractive multi-focal ophthalmic lenses capable of generating at least three focal points in an optical axis direction using a diffractive structure comprising a plurality of zones in a concentric circle form, the diffractive structure comprising a composite profile which includes a phase profile that is dividable into a plurality of starting profiles being overlapped each other, and for which radial direction positions of the respective zones are set according to the plurality of starting profiles, wherein

• adjusted profiles are set in the respective diffractive multi-focal ophthalmic lenses for which, for each adjusted profile, at least one of the zones of the composite profile is a zone having a different phase and/or amplitude from an overlapping of the plurality of starting profiles,
• light intensity distributions of the diffractive multi-focal ophthalmic lenses in the optical axis direction are made mutually different by settings of the adjusted profiles being mutually different,
• at least a portion of the phase of the adjusted profile is expressed as a blaze shaped function in relation to a lens radial distance,
• in the plurality of starting profiles, at least a portion of each phase is expressed as a blaze shaped function in relation to a lens radial distance, and
• the blaze shaped function is expressed by Equation 13
• ϕ
• ⁡
• (
• r
• )
• =
• ϕ
• i
• -
• ϕ
• i
• -
• 1
• r
• i
• -
• r
• i
• -
• 1
• ×
• r
• +
• ϕ
• i
• -
• 1
• ×
• r
• i
• -
• ϕ
• i
• ×
• r
• i
• -
• 1
• r
• i
• -
• r
• i
• -
• 1
• +
• τ
• [
• Equation
• ⁢
• ⁢
• 13
• ]
• r:
• Radial distance from the lens center
• ri−1:
• Inner diameter of the ith zone (radius)
• ri:
• Outer diameter of the ith zone (radius)
• ϕi−1:
• Phase at the inner diameter (radius) position of the ith zone
• ϕi:
• Phase at the outer diameter (radius) position of the ith zone
• τ:
• Phase shift.