US5040883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light fixture with beam shaping lens
Assignee: 3M Co
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Filing: 1989-10-30
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Granted: 1991-08-20
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Expires: 2009-10-30
Abstract
Abstract A light extraction film has light extraction structures on one surface and a Fresnel lens for beam shaping on the opposite surface.
Inventors
- 👤 Sanford Cobb, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:52
CPC Classifications
G; G09; G09F; G09F13/00; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/0035; G02B6/0036; F; F21; F21V; F21V5/00; F21V5/02; G02B3/00; G02B3/02; G02B3/08; G02B6/0013; G02B6/0015; G02B6/002; G02B6/0021; G02B6/0058; G02B6/0061
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
Light extraction film for producing a shaped output light beam having first and second major surfaces said first major surface having linear light extraction structures thereon, each of said light extraction structures having an axis running in a first direction, said light extraction structures being for extracting light from a beam of light and directing said extracted light toward said second major surface, and a Fresnel lens formed on said second major surface for shaping said output light beam.
Claim 2
Dependent Claim
79 words
Light extraction film for producing a shaped output light beam having first and second major surfaces said first major surface having linear light extraction structures thereon, each of said light extraction structures having an axis running in a first direction, said light extraction structures being for extracting light from a beam of light and directing said extracted light toward said second major surface, and a Fresnel lens formed on said second major surface for shaping said output light beam.
Claim 3
Dependent Claim
30 words
The light extraction film of claim 1 wherein said Fresnel Lens comprises a plurality of linear structures, each of said linear structures having an axis running in a second direction.
Claim 4
Dependent Claim
17 words
The light extraction film of claim 2 wherein said first direction is perpendicular to said second direction.
Claim 5
Dependent Claim
18 words
The light extraction film of claim 1 wherein said light extraction structures comprise a plurality of triangular prisms.
Claim 6
Dependent Claim
14 words
The light extraction film of claim 4 wherein said triangular prisms form isosceles triangles.
Claim 7
Dependent Claim
21 words
The light extraction film of claim 5 wherein said prisms have included angles in the range of 59° to 79° .
Claim 8
Dependent Claim
30 words
The light extraction film of claim 6 wherein said Fresnel Lens comprises a plurality of linear structures, each of said linear structures having an axis running in a second direction.
Claim 9
Dependent Claim
17 words
The light extraction film of claim 7 wherein said first direction is perpendicular to said second direction.
Claim 10
Dependent Claim
25 words
The light extraction film of claim 5 wherein said prisms are divided into repeating groups wherein said prisms of a group have varying included angles.
Claim 11
Dependent Claim
30 words
The light extraction film of claim 9 wherein said Fresnel Lens comprises a plurality of linear structures, each of said linear structures having an axis running in a second direction.
Claim 12
Dependent Claim
17 words
The light extraction film of claim 10 wherein said first direction is perpendicular to said second direction.
References Cited (Backward Citations)
JPS5754902A
Cited
US4385808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |