US4995714A — Multifocal optical device with novel phase zone p…

Claim 1

Independent Claim 37 words

A diffractive multifocal optical element comprising a phase zone plate of a Cohen lens design containing rotationally symmetrical, curved repetitive patterns designed to operate at a specific wavelength and which are also curved in r 2 space.

Claim 2

Dependent Claim 37 words

A diffractive multifocal optical element comprising a phase zone plate of a Cohen lens design containing rotationally symmetrical, curved repetitive patterns designed to operate at a specific wavelength and which are also curved in r 2 space.

Claim 3

Dependent Claim 19 words

The diffractive multifocal optical element of claim 1 including at least two phase zone plates within its optic zone.

Claim 4

Dependent Claim 13 words

The diffractive multifocal optical element of claim 1 including a pure refractive portion.

Claim 5

Dependent Claim 15 words

The diffractive multifocal optical element of claim 1 in the form of an ophthalmic lens.

Claim 6

Dependent Claim 19 words

The ophthalmic lens of claim 4 in the form of one of a contact lens and an intraocular lens.

Claim 7

Dependent Claim 15 words

The diffractive multifocal optical element of claim 2 in the form of an ophthalmic lens.

Claim 8

Dependent Claim 19 words

The ophthalmic lens in claim 6 in the form of one of a contact lens and an intraocular lenses.

Claim 9

Dependent Claim 15 words

The diffractive multifocal optical element of claim 3 in the form of an ophthalmic lens.

Claim 10

Dependent Claim 19 words

The ophthalmic lens of claim 8 in the form of one of a contact lens and an intraocular lenses.

Claim 11

Dependent Claim 125 words

A diffractive multifocal optical element comprising a phase zone plate containing rotationally symmetrical repetitive patterns (i.) designed to operate at a specific wavelength and (ii.) which (a) are periodic in accordance with √n spacing, where n is an integer representing the zone number, (b) have profiles that are curved in r 2 space, (c) contain modulations within the pattern sufficient to introduce a phase shift in the optical path of about λ/8 or more, where λ is the designed wavelength, and (d) are correlated such that the light intensity at two focal points comprise, for each focal point, at least 20 percent of the incoming light at λ, and the ratio of the intensities at the two focal points is between about 0.5 and 2.00.

Claim 12

Dependent Claim 125 words

A diffractive multifocal optical element comprising a phase zone plate containing rotationally symmetrical repetitive patterns (i.) designed to operate at a specific wavelength and (ii.) which (a) are periodic in accordance with √n spacing, where n is an integer representing the zone number, (b) have profiles that are curved in r 2 space, (c) contain modulations within the pattern sufficient to introduce a phase shift in the optical path of about λ/8 or more, where λ is the designed wavelength, and (d) are correlated such that the light intensity at two focal points comprise, for each focal point, at least 20 percent of the incoming light at λ, and the ratio of the intensities at the two focal points is between about 0.5 and 2.00.

Claim 13

Dependent Claim 15 words

The diffractive multifocal optical element of claim 10 in the form of an ophthalmic lens.

Claim 14

Dependent Claim 19 words

The ophthalmic lens of claim 11 in the form of one of a contact lens and an intraocular lens.

Claim 15

Dependent Claim 97 words

A diffractive multifocal optical element comprising a phase zone plate of a Cohen lens design containing correlated rotationally symmetrical, curved repetitive patterns designed to operate at a specific wavelength, which curved repetitive patterns are curved as well in r 2 space and the variability in thickness or the refractive index of the repetitive patterns are correlated such that the light intensity at two focal points comprise, for each focal point, at least 20 percent of the incoming light at λ, and the ratio of the intensities at the two focal points is between about 0.5 and 2.00.

Claim 16

Dependent Claim 97 words

A diffractive multifocal optical element comprising a phase zone plate of a Cohen lens design containing correlated rotationally symmetrical, curved repetitive patterns designed to operate at a specific wavelength, which curved repetitive patterns are curved as well in r 2 space and the variability in thickness or the refractive index of the repetitive patterns are correlated such that the light intensity at two focal points comprise, for each focal point, at least 20 percent of the incoming light at λ, and the ratio of the intensities at the two focal points is between about 0.5 and 2.00.

Claim 17

Independent Claim 133 words

A method for making a phase zone plate containing non-parabolic zone profiles to provide a diffraction bifocal element which comprises: (a) characterize a desired light intensity values for the 0 th and 1 st orders and a transmission profile for the facets different from the generally accepted parabolic profiles, (b) plug the equation of the new profile into the Kirchoff diffraction integral and plot the result for the intensity at 0 th order and 1 st order on a scale of 0 to 100% on one axis against the variation in depth of the facet, (c) determine where the resultant curves cross one another to define a useful profile at the facet depth for the crossover point, and (d) shape a lens with a phase zone plate in conformity with such defined profile.

Claim 18

Independent Claim 133 words

A method for making a phase zone plate containing non-parabolic zone profiles to provide a diffraction bifocal element which comprises: (a) characterize a desired light intensity values for the 0 th and 1 st orders and a transmission profile for the facets different from the generally accepted parabolic profiles, (b) plug the equation of the new profile into the Kirchoff diffraction integral and plot the result for the intensity at 0 th order and 1 st order on a scale of 0 to 100% on one axis against the variation in depth of the facet, (c) determine where the resultant curves cross one another to define a useful profile at the facet depth for the crossover point, and (d) shape a lens with a phase zone plate in conformity with such defined profile.

Claim 19

Dependent Claim 46 words

A multifocal optical element comprising: a phase zone plate including a plurality of zones spaced in proportion to the square root of n, where n is the zone number; and each of said plurality of zones including a profile that is curved in r 2 space.

Claim 20

Dependent Claim 46 words

A multifocal optical element comprising: a phase zone plate including a plurality of zones spaced in proportion to the square root of n, where n is the zone number; and each of said plurality of zones including a profile that is curved in r 2 space.

Claim 21

Dependent Claim 16 words

The multifocal optical element as claimed in claim 15 in the form of an ophthalmic lens.

Claim 22

Dependent Claim 27 words

The multifocal optical element as claimed in claim 16 wherein the ophthalmic lens is in the form of one of a contact lens and an intraocular lens.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-02-25	1994-08-27	1995-02-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-02-25	1998-08-27	1999-02-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-02-25	2002-08-27	2003-02-26	$7700.00	Window Closed / Lapsed

Multifocal optical device with novel phase zone plate and method for making

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