US5111343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gradient filter
Assignee: Eastman Kodak Co
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Filing: 1990-05-29
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Granted: 1992-05-05
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Expires: 2010-05-29
Abstract
Abstract A gradient filter is disclosed which is adapted to compensate for the variation of beam divergence of diode lasers. The gradient filter comprises a substrate having a transmission density distribution along at least one axis which is inversely proportional to a Gaussian intensity distribution along the axis. Such a gradient filter has a transmission profile which is transparent, or nearly so, at the center of the beam and which falls gradually to zero transmission in an area spaced from the center.
Inventors
- 👤 Michael E. Harrigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:45
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/205; G02B19/00; G02B19/0004; G02B19/0009; G02B19/0014; G02B19/0033; G02B19/0047; G02B19/0052; G02B27/00; G02B27/09; G02B27/0927; G02B27/0938; G02B27/0988
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
70 words
A gradient filter for reducing width variations in a diode laser beam, said filter being formed on a photographic film and having a transmission profile proportional to: e.sup.-2(x/w.sbsp.x.sup.).spsp.2.sup.-2(y/w.sbsp.y.sup.).spsp.2 where x and y are position coordinates from a center of the beam, w x is the e -2 radius of the x section of the beam, and w y is the e -2 radius of the y section of the beam.
Claim 2
Dependent Claim
70 words
A gradient filter for reducing width variations in a diode laser beam, said filter being formed on a photographic film and having a transmission profile proportional to: e.sup.-2(x/w.sbsp.x.sup.).spsp.2.sup.-2(y/w.sbsp.y.sup.).spsp.2 where x and y are position coordinates from a center of the beam, w x is the e -2 radius of the x section of the beam, and w y is the e -2 radius of the y section of the beam.
Claim 3
Dependent Claim
15 words
A gradient filter, as defined in claim 1, wherein said film is a negative film.
Claim 4
Dependent Claim
15 words
A gradient filter, as defined in claim 1, wherein said film is a positive film.
Claim 5
Dependent Claim
76 words
A gradient filter for reducing width variations in a diode laser beam, said filter being formed by a plurality of concentric elements which form a discrete approximation of a transmission profile proportional to: e.sup.-2(x/w.sbsp.x.sup.).spsp.2.sup.-2(y/w.sbsp.y.sup.).spsp.2 where x and y are position coordinates from a center of the beam, w x is the e -2 radius of the x section of the beam, and w y is the e -2 radius of the y section of the beam.
Claim 6
Dependent Claim
76 words
A gradient filter for reducing width variations in a diode laser beam, said filter being formed by a plurality of concentric elements which form a discrete approximation of a transmission profile proportional to: e.sup.-2(x/w.sbsp.x.sup.).spsp.2.sup.-2(y/w.sbsp.y.sup.).spsp.2 where x and y are position coordinates from a center of the beam, w x is the e -2 radius of the x section of the beam, and w y is the e -2 radius of the y section of the beam.
Claim 7
Dependent Claim
17 words
A gradient filter, as defined in claim 4, wherein each of said elements is elliptical in shape.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-05 | 1995-11-04 | 1996-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-05 | 1999-11-04 | 2000-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-05 | 2003-11-04 | 2004-05-05 | $7700.00 | Window Closed / Lapsed |