Patent US4338005A successfully refreshed from Google Patents.
US4338005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multifocal phase place
Assignee: Individual
•
Filing: 1980-04-21
•
Granted: 1982-07-06
•
Expires: 2000-04-21
Abstract
Abstract A phase plate construction suitable for use in optical systems with multifocal requirements. It is designed as a phase plate in order to provide sharp and clear focii with bright images. This is accomplished by adjusting the Fresnel echelettes and the zone plate spacings, of the phase plate, such that the Fresnel lens focii coincide with particular zone plate focii.
Inventors
- 👤 Allen L. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:45
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/189; G02B5/1895
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
A multiple focal power optical device comprising: body means having a plurality of alternating annular, concentric zones, bounded on the outside by radii r n , with n=1, 2, 3, . . . ; first focal power means within at least some of the zones for directing incident parallel light to a first focal point +d/N, with N an integer; second focal power means within at least some of the zones for directing incident parallel light to a second focal point -d/N; wherein the radii r n of said zones are substantially proportional to the square root of n; and wherein the absolute value of r 1 is set equal to √λd, with λ equal to the wavelength under consideration, and d is chosen arbitrarily.
Claim 2
Dependent Claim
125 words
A multiple focal power optical device comprising: body means having a plurality of alternating annular, concentric zones, bounded on the outside by radii r n , with n=1, 2, 3, . . . ; first focal power means within at least some of the zones for directing incident parallel light to a first focal point +d/N, with N an integer; second focal power means within at least some of the zones for directing incident parallel light to a second focal point -d/N; wherein the radii r n of said zones are substantially proportional to the square root of n; and wherein the absolute value of r 1 is set equal to √λd, with λ equal to the wavelength under consideration, and d is chosen arbitrarily.
Claim 3
Dependent Claim
14 words
The invention of claim 1 wherein said body means comprises an optically refracting material.
Claim 4
Dependent Claim
25 words
The invention of claim 2 wherein said first and second focal power means comprise a plurality of discreet refracting elements within their respective annular zones.
Claim 5
Dependent Claim
27 words
The invention of claim 3 wherein at least some of said optically refracting elements include contaminants imbedded in said body means to achieve the desired focal powers.
Claim 6
Dependent Claim
35 words
The invention of claim 4 wherein the discreet refractive elements of the first focal power means occupy every odd zone, and the discreet refractive elements of the second focal power means occupy every even zone.
Claim 7
Dependent Claim
20 words
The invention of claim 1 further including a third focal power means within at least some of the annular zones.
Claim 8
Dependent Claim
55 words
The invention of claim 1 wherein the first focal power means directs incident parallel light to the focal point +d, and wherein the second focal power means directs incident parallel light to the focal point -d, and further wherein the second focal power means occupys every zone not occupied by the first focal power means.
Claim 9
Dependent Claim
19 words
The invention of claim 1 wherein the body means is designed to act as an ophthalmic bifocal spectacle lens.
Claim 10
Dependent Claim
19 words
The invention of claim 7 wherein the body means is designed to act as an ophthalmic bifocal spectacle lens.
Claim 11
Dependent Claim
19 words
The invention of claim 1 wherein the body means is designed to act as an ophthalmic bifocal contact lens.
Claim 12
Dependent Claim
19 words
The invention of claim 7 wherein the body means is designed to act as an opthalmic bifocal contact lens.
Claim 13
Dependent Claim
15 words
The invention of claim 1 wherein the said body means comprises an optically reflecting material.
References Cited (Backward Citations)
US3004470A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |