US4826299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear deiverging lens
Assignee: National Research Council Canada
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Filing: 1987-01-30
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Granted: 1989-05-02
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Expires: 2007-01-30
Abstract
Abstract A new type of lens is described. The lens has the appearance of a prism with a relatively sharp radius at the apex. This lens finds an application in expanding a laser beam in one direction only.
Inventors
- 👤 Ian Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:15
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/04; G02B3/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
85 words
An optical lens having at least two surfaces, the primary surface and the secondary surface, the primary surface having a relatively sharp apex and being shaped to conform to a curve defined in a (x,y,z) cartesian coordinate system by the following equation ##EQU3## where y and z are independent of x, c is the curvature at the apex and Q is the conic constant in that the magnitude of the product, Q·c, lies between 0.25 and 50 mm -1 and Q is less than -1.
Claim 2
Dependent Claim
85 words
An optical lens having at least two surfaces, the primary surface and the secondary surface, the primary surface having a relatively sharp apex and being shaped to conform to a curve defined in a (x,y,z) cartesian coordinate system by the following equation ##EQU3## where y and z are independent of x, c is the curvature at the apex and Q is the conic constant in that the magnitude of the product, Q·c, lies between 0.25 and 50 mm -1 and Q is less than -1.
Claim 3
Dependent Claim
26 words
The optical lens according to claim 1, wherein the secondary surface is selected from a group of shapes consisting of flat, negatively cylindrical and negatively spherical.
Claim 4
Dependent Claim
22 words
The optical lens according to claim 2, wherein the primary and the secondary surfaces are furthest from each other at the apex.
Claim 5
Dependent Claim
22 words
The optical lens according to claim 2, wherein the primary and the secondary surfaces are closest to each other at the apex.
Claim 6
Dependent Claim
128 words
A laser beam expander for expanding a laser beam in one direction, comprising: a source of the said laser beam; and an optical lens having an apex and located relative to the source so that the apex is in the laser beam; in that the optical lens has at least two surfaces, the primary and the second surfaces; the said primary surface containing the said apex and being shaped to conform to a curve defined in a (x,y,z) cartesian coordinate system by the following equation: ##EQU4## where y and z are independent of x, c is the curvature at the apex and Q is the conic constant in that the magnitude of the product Q·c, lies between 0.25 and 50 mm -1 and Q is less than -1.
Claim 7
Dependent Claim
128 words
A laser beam expander for expanding a laser beam in one direction, comprising: a source of the said laser beam; and an optical lens having an apex and located relative to the source so that the apex is in the laser beam; in that the optical lens has at least two surfaces, the primary and the second surfaces; the said primary surface containing the said apex and being shaped to conform to a curve defined in a (x,y,z) cartesian coordinate system by the following equation: ##EQU4## where y and z are independent of x, c is the curvature at the apex and Q is the conic constant in that the magnitude of the product Q·c, lies between 0.25 and 50 mm -1 and Q is less than -1.
Claim 8
Dependent Claim
27 words
The laser beam expander according to claim 5, wherein the secondary surface is selected from a group of shapes consisting of flat, negatively cylindrical and negatively spherical.
Claim 9
Dependent Claim
23 words
The laser beam expander according to claim 6, wherein the primary and the secondary surfaces are furthest from each other at the apex.
Claim 10
Dependent Claim
23 words
The laser beam expander according to claim 6, wherein the primary and the secondary surfaces are closest to each other at the apex.
Claim 11
Dependent Claim
21 words
The laser beam expander according to claim 7 wherein the primary surface is oriented toward the source of the laser beam.
Claim 12
Dependent Claim
21 words
The laser beam expander according to claim 8 wherein the primary surface is oriented toward the source of the laser beam.
Claim 13
Dependent Claim
21 words
The laser beam expander according to claim 7 wherein the secondary surface is oriented toward the source of the laser beam.
Claim 14
Dependent Claim
21 words
The laser beam expander according to claim 8 wherein the secondary surface is oriented toward the source of the laser beam.
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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |