# US 11,029,536 B2 · Multifocal lens

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- Number: US 11,029,536 B2
- Document ID: US11029536B2
- Status: Granted
- Kind: B2
- Application number: 16/590,698
- Filed: 2019-10-02
- Published: 2020-01-30
- Granted: 2021-06-08
- Earliest claimed: 2015-10-02
- Assignees: Rayner Intraocular Lenses Limited
- Applicants: Rayner Intraocular Lenses Limited
- Inventors: Kirsten Lux; Nicole Plank; Wolfgang Brezna; Nikolaus Dragostinoff
- Web page: https://patentgrep.com/patent/US11029536B2

## CPC

- A61F 2/1618: {Multifocal lenses}
- A61F 2/1654: {Diffractive lenses}
- G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)}
- G02B 5/1876: {Diffractive Fresnel lenses; Zone plates; Kinoforms (G02B5/1842, G02B5/1847 take precedence; optical systems having diffractive correction means G02B27/0037; Fresnel lenses operating by refraction G02B3/08)}
- G02C 7/042: {Simultaneous type}
- G02C 7/044: {Annular configuration, e.g. pupil tuned}
- G02C 2202/20: Diffractive and Fresnel lenses or lens portions
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)

## Abstract

The invention relates to a multifocal lens (1) with a refractive focus (Fr) and with a diffractive structure (5) which, in the radial direction (r) of the lens (1), plotted across the squared radius (r2), has a periodic profile (6, 7, 8, 9), wherein the profile (6, 7, 8, 9) per period has four adjoining portions (6, 7, 8, 9) which are not differentiable at their connection sites (10, 11, 12, 13), wherein a first portion (9) has a monotonically falling function and the three further portions (6, 7, 8) have a monotonically rising function or vice versa, and wherein the further portion (7), which does not adjoin the first portion (9), has a greater pitch than the other further portions (6, 8).

## Claims

### Claim 1

A multifocal lens with a refractive focal point (Fr) and a diffractive structure, the structure having a periodic profile in the radial direction (r) of the lens plotted over the squared radius (r2), and
the profile having four mutually adjacent portions per period which cannot be differentiated at their junctions,
the four portions including a first portion, a second portion, a third portion and a fourth portion, wherein the first portion is adjacent to the fourth portion and the second portion, and the third portion is adjacent to the second portion and fourth portion,
wherein the first portion falls monotonically and the second portion, the third portion, and the fourth portion each rise monotonically, or a first portion rises monotonically and the second portion, the third portion, and the fourth portion each fall monotonically, and
wherein the third portion has a steeper gradient than the second portion and the fourth portion, and wherein the period (p) of the profile, plotted over the squared radius, amounts to 0.5 mm2 to 1 mm2 and the profile depth (T) to 2 μm to 10 μm.

### Claim 2 (depends on 1)

The multifocal lens according to claim 1, wherein the first portion, the second portion, the third portion, and the fourth portion each are linear when plotted over the squared radius (r2).

### Claim 3 (depends on 1)

The multifocal lens according to claim 1, wherein the first portion is substantially vertical.

### Claim 4 (depends on 1)

The multifocal lens according to claim 1, wherein the third portion is substantially vertical.

### Claim 5 (depends on 1)

The multifocal lens according to claim 1, wherein the second portion and the fourth portion have substantially the same gradient.

### Claim 6 (depends on 1)

The multifocal lens according to claim 1, wherein the multifocal lens is an intraocular lens or contact lens.