US5017000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multifocals using phase shifting
Assignee: Individual
•
Filing: 1986-05-14
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Granted: 1991-05-21
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Expires: 2006-05-14
Abstract
Abstract This invention relates to a multifocal optical lens configuration that relies on the phenomenon of simultaneous vision whereby the eye is presented with two clear images at once. In particular this invention allows a lens to be made with arbitrary relative brighnesses between the multiple images.
Inventors
- 👤 Allen L. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:34
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/189; G02B5/1895; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; A61F2/1616; A61F2/1618; G02B3/00; G02B3/10; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/042; G02C7/044; G02C7/06; G02C2202/00; G02C2202/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
53 words
A multiple focal point profiled phase plate having a plurality of annular concentric zones spaced according to the formula ##EQU8## where r(k) is the zone radii and k is a zone; in which a repetitive step is incorporated in the profile and has an optical path length greater or less than one-half wavelength.
Claim 2
Dependent Claim
53 words
A multiple focal point profiled phase plate having a plurality of annular concentric zones spaced according to the formula ##EQU8## where r(k) is the zone radii and k is a zone; in which a repetitive step is incorporated in the profile and has an optical path length greater or less than one-half wavelength.
Claim 3
Dependent Claim
31 words
The multiple focal point profiled phase plate of claim 1 wherein the phase plate is part of an optical device containing body means, which body means comprises an optically refracting material.
Claim 4
Dependent Claim
55 words
The multiple focal point profiled phase plate of claim 2 wherein a phase shifting means is provided in at least some of the annular zones, the phase shifting means being of a step function nature, causing a substantial constant shift in the optical path length across essentially the entire zone into which it is incorporated.
Claim 5
Dependent Claim
23 words
The multiple focal point profiled phase plate of claim 3 wherein the phase shifting means is an excavated portion of the body means.
Claim 6
Dependent Claim
19 words
The multiple focal point profiled phase plate of claim 3 wherein the phase shifting means occupies every alternate zone.
Claim 7
Dependent Claim
34 words
The multiple focal point profiled phase plate of claim 3 wherein the phase shifting means is adjusted so as to cause equal image brightnesses at each of the focal points of said body means.
Claim 8
Dependent Claim
37 words
The multiple focal point profiled phase plate of claim 3 wherein the phase shifting steps are adjusted so as to create a trifocal with equal image brightnesses at each of the focal points of said body means.
Claim 9
Dependent Claim
30 words
The multiple focal point profiled phase plate of claim 3 wherein the phase shifting steps are adjusted so as to cause the lens to focus some wavelengths of light preferentially.
Claim 10
Dependent Claim
29 words
The multiple focal point profiled phase plate of claim 3 wherein the phase shifting steps are adjusted so as to reduce the maximum depths of any blaze or step.
Claim 11
Dependent Claim
20 words
The multiple focal point profiled phase plate of claim 3 wherein the optical device is designed as a contact lens.
Claim 12
Dependent Claim
20 words
The multiple focal point profiled phase plate of claim 3 wherein the optical device is designed as a spectacle lens.
Claim 13
Dependent Claim
21 words
The multiple focal point profiled phase plate of claim 3 wherein the optical device is designed as an intraocular lens implant.
Claim 14
Dependent Claim
19 words
The multiple focal point profiled phase plate of claim 1 wherein the optical device is designed as a mirror.
Claim 15
Dependent Claim
29 words
The multiple focal point profiled phase plate of claim 3 wherein the phase shifting means includes the body means together with imbedded contaminants to achieve the desired phase shift.
Claim 16
Dependent Claim
27 words
The multiple focal point profiled phase plate of claim 1 wherein the phase plate is designed to operate as a multifocal lens in the visible light range.
Claim 17
Dependent Claim
24 words
The multiple focal point profiled phase plate of claim 15 wherein the body means of said phase plate is designed as a contact lens.
Claim 18
Dependent Claim
24 words
The multiple focal point profiled phase plate of claim 15 wherein the body means of said phase plate is designed as a camera lens.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |