Patent US4824310A successfully refreshed from Google Patents.
Patent EP0742462A2 successfully refreshed from Google Patents.
EP0742462A2
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Programmable smooth junctions on lenses
Assignee: Johnson and Johnson Vision Care Inc
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Filing: 1996-05-03
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Granted: —
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Expires: 2016-05-03
Abstract
Abstract Programmable smooth junctions are provided for lenses and molds therefor, particularly for toric lens designs, which enable a numerically controlled (NC) machine to be programmed to machine smooth junctions or transitions between adjacent regions of a lens which have different thicknesses or radii of curvature. First and second mathematical functions f(a) and f(b) are defined which specify the curves of first and second segments of a lens surface. The slope dy/dx is derived of the first and second mathematical functions f(a) and f(b) at the transition between the first and second segments of the lens surface. A mathematical function is defined which describes a desired transition between the first and second segments of the lens. The first and second mathematical functions f(a) and f(b), the derived slopes dy/dx of the first and second mathematical functions f(a) and f(b), and the mathematical function describing the desired transition are then utilized to program a numerically controlled machine to machine the first and second segments of the lens surface and the desired transition between the first and second segments.
Inventors
- 👤 Jeffrey H. Roffman
- 👤 Timothy A. Clutterbuck
- 👤 Yulin X. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:11
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/024; G02C7/028; G02C7/04; G02C7/047
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
199 words
A method of designing a lens which enables a numerically controlled machine to be programmed to machine smooth transitions between adjacent regions of the lens which have different thicknesses or radii of curvature, comprising: a. defining a first mathematical function f(a) which specifies the curve of a first segment of a lens surface; b. defining a second mathematical function f(b) which specifies the curve of a second segment of the lens surface; c. deriving the slope dy/dx of the first mathematical function f(a) at the transition between the first and second segments of the lens surface; d. deriving the slope dy/dx of the second mathematical function f(b) at the transition between the first and second segments of the lens surface; e. defining a mathematical function which describes a desired transition between the first and second segments of the lens; f. utilizing the first and second mathematical functions f(a) and f(b), the derived slopes dy/dx of the first and second mathematical functions f(a) and f(b), and the mathematical function describing the desired transition to program a numerically controlled machine to machine the first and second segments of the lens surface and the desired transition between the first and second segments.
Claim 2
Dependent Claim
63 words
A method of designing a lens as claimed in claim 1, further including: a. normalizing the x interval between the two functions f(a) and f(b) into the gap between the first and second segments of the lens surface; b. normalizing the y interval between the two functions f(a) and f(b) into the gap between the first and second segments of the lens surface;
Claim 3
Dependent Claim
28 words
A method of designing a lens as claimed in claim 2, wherein the normalizing of the x interval and the normalizing of the y interval is to +/-1.
Claim 4
Dependent Claim
22 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes a linear function.
Claim 5
Dependent Claim
23 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes a single bridge radius.
Claim 6
Dependent Claim
21 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes multiple radii.
Claim 7
Dependent Claim
22 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes an aspheric radius.
Claim 8
Dependent Claim
22 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes multiple aspheric radii.
Claim 9
Dependent Claim
25 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes mixed multiple spheric and aspheric radii.
Claim 10
Dependent Claim
25 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes multiple radii with a reversed curve.
Claim 11
Dependent Claim
38 words
A method of designing a lens as claimed in claim 1, wherein a thicker central optical zone of the contact lens is connected to a thinner peripheral lenticular zone of the contact lens with a defined transition curve.
Claim 12
Dependent Claim
81 words
A method of designing a lens as claimed in claim 1, wherein a control design defines a fixed base curve and a front curve based upon the desired center thickness and a desired optical power, and a transition is specified from the front curve to the lenticular junction of the lens, wherein the central thickness design is based upon the same base curve as the control design, and the front curve is based upon the center thickness and desired optical power.
Claim 13
Dependent Claim
22 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes a power function.
Claim 14
Dependent Claim
23 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes an asymptotic connection function.
Claim 15
Dependent Claim
22 words
A method of designing a lens as claimed in claim 1, wherein the mathematical function describing the transition describes a trigonometric function.
Claim 16
Dependent Claim
11 words
A contact lens produced according to the method of claim 1.
References Cited (Backward Citations)
No citation records indexed.
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