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Patent US5521796A successfully refreshed from Google Patents.
US5521796A
Expired / Lapsed
US
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Light conducting plate for surface light source device and method for the manufacture thereof
Assignee: Taiho Kogyo Co Ltd
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Filing: 1994-09-22
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Granted: 1996-05-28
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Expires: 2014-09-22
Abstract
Abstract A light conducting plate for a surface light source device wherein a linear light source is disposed at a light entrance edge at at least one end of a light conducting plate whose one surface is provided with a reflecting layer and whose other surface is defined as a light-emitting surface. The light of the linear light source is scattered within the interior of the light conducting plate by the reflecting layer and emitted from the light-emitting surface. The light conducting plate for a surface light source device is constituted by forming the reflecting layer by moving a bit along the surface of the light conducting plate to be formed with the reflecting layer while pressing it thereon at a negative rake angle to continuously form hole-like pits of random depth and width by fracturing of the surface to be formed with the reflecting layer as a result of exceeding its elastic limit, and forming a plurality of the pit rows in which the pits are continuously aligned.
Inventors
- 👤 Hiromi Osakada
- 👤 Takaaki Katakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:53
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/0035; G02B6/0036; G02B6/005; G02B6/0055; G02B6/0058; G02B6/0061; G02B6/0066; G02B6/007; G02B6/0071; G02B6/0065; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133615
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A light conducting plate for a surface light source device wherein a linear light source is disposed at a light entrance edge at at least one end of a light conducting plate whose first surface is provided with a reflecting layer and whose other surface is defined as a light-emitting surface, a light of said linear light source being scattered within the interior of the light conducting plate by said reflecting layer and emitted from the light-emitting surface, the light conducting plate for the surface light source device constituted by forming the reflecting layer by continuously forming hole-like pits of random depth and width in the first surface by causing said reflecting layer to fracture as a result of the first surface exceeding an elastic limit of a material of which the plate is formed, and forming a plurality of parallel pit rows in which the aforesaid pits are aligned.
Claim 2
Dependent Claim
150 words
A light conducting plate for a surface light source device wherein a linear light source is disposed at a light entrance edge at at least one end of a light conducting plate whose first surface is provided with a reflecting layer and whose other surface is defined as a light-emitting surface, a light of said linear light source being scattered within the interior of the light conducting plate by said reflecting layer and emitted from the light-emitting surface, the light conducting plate for the surface light source device constituted by forming the reflecting layer by continuously forming hole-like pits of random depth and width in the first surface by causing said reflecting layer to fracture as a result of the first surface exceeding an elastic limit of a material of which the plate is formed, and forming a plurality of parallel pit rows in which the aforesaid pits are aligned.
Claim 3
Dependent Claim
27 words
A light conducting plate for a surface light source device according to claim 1, wherein the inner surfaces of the pits are formed with fine irregularities throughout.
Claim 4
Dependent Claim
30 words
A light conducting plate for a surface light source device according to claim 2, wherein fine cracks extending into the interior of the light conducting plate occur in the pits.
Claim 5
Dependent Claim
34 words
A light conducting plate for a surface light source device according to claim 3, wherein said pit rows are aligned along a direction in which the transmitting light advances in the light conducting plate.
Claim 6
Dependent Claim
30 words
A light conducting plate for a surface light source device according to claim 1, wherein fine cracks extending into the interior of the light conducting plate occur in the pits.
Claim 7
Dependent Claim
34 words
A light conducting plate for a surface light source device according to claim 5, wherein said pit rows are aligned along a direction in which the transmitting light advances in the light conducting plate.
Claim 8
Dependent Claim
34 words
A light conducting plate for a surface light source device according to claim 1, wherein said pit rows are aligned along a direction in which the transmitting light advances in the light conducting plate.
References Cited (Backward Citations)
US5130898A
Cited
US5349503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-28 | 1999-11-27 | 2000-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-28 | 2003-11-27 | 2004-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-28 | 2007-11-27 | 2008-05-28 | $7700.00 | Window Closed / Lapsed |