US4985809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface light source panel
Assignee: Maytaku System
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Filing: 1989-08-22
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Granted: 1991-01-15
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Expires: 2009-08-22
Abstract
Abstract The present invention provides a surface light source panel having superior brightness and uniformity of light. According to the present invention, diffused reflection sections are formed onto a transparent resin substrate by the printing of ink. Since the density of the diffused reflection sections and the area ratio thereof with respect to the transparent resin substrate, and also the containing ratio of additives in the ink are specified, the surface light source panel displays superior brightness and uniformity of light even when the substrate is a single plate which has ben laminated in a conventional panel. Moreover, although the surface light source panel of the present invention is provided with a light source at one end thereof, since the portion of the largest area ratio of the diffused reflection sections is arranged at a position deflected to the side of a reflecting part at the other end of the panel, the brightness and uniformity of the light can be more secured.
Inventors
- 👤 Hirokazu Matsui
- 👤 Shinzo Murase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:10
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/0035; G02B6/004; G02B6/0041; G02B6/0065; G02B6/0081; G02B6/0058; G02B6/0061; G09; G09F; G09F13/00; G09F13/18; G09F2013/1804; G09F2013/1831; G09F2013/1872; G09F2013/1877
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
A surface light panel, comprising: a transparent substrate, a light source at one end of said transparent substrate; a reflecting means at the other end of said transparent substrate; and a plurality of diffused reflection sections on said transparent substrate; wherein said diffused reflection sections are distributed on said transparent substrate such that the ratio of said diffused reflection sections per unit area of said transparent substrate sequentially increases the further said diffused reflection sections are from said light source up to a maximum area ratio position and decreases the closer said diffused reflection sections are to said reflecting means from said maximum area ratio position.
Claim 2
Dependent Claim
106 words
A surface light panel, comprising: a transparent substrate, a light source at one end of said transparent substrate; a reflecting means at the other end of said transparent substrate; and a plurality of diffused reflection sections on said transparent substrate; wherein said diffused reflection sections are distributed on said transparent substrate such that the ratio of said diffused reflection sections per unit area of said transparent substrate sequentially increases the further said diffused reflection sections are from said light source up to a maximum area ratio position and decreases the closer said diffused reflection sections are to said reflecting means from said maximum area ratio position.
Claim 3
Dependent Claim
34 words
The surface light source panel as set forth in claim 1, wherein: said maximum area ratio position is located more than halfway from said light source toward said reflecting means on said transparent substrate.
Claim 4
Dependent Claim
35 words
The surface light source panel as set forth in claim 1, wherein: said ratio of said diffused reflection sections decreases symmetrically from said maximum area ratio position toward said light source and said reflecting means.
Claim 5
Dependent Claim
24 words
The surface light panel as set forth in claim 1, wherein said ratio of said diffused reflection sections changes gradually on said transparent substrate.
Claim 6
Dependent Claim
40 words
The surface light source panel as set forth in claim 1, wherein said diffused reflection sections are composed such that they produce a slight diffuse reflection and maintain a light permeability sufficient to pass light therethrough with a dimming effect.
Claim 7
Dependent Claim
34 words
The surface light source panel as set forth in claim 1, wherein said area ratio changes in a range of 20-40% and 50-60% at the lowermost and uppermost sides of said transparent substrate, respectively.
Claim 8
Dependent Claim
70 words
The surface light source panel as set forth in claim 1, wherein said diffused reflection sections on said transparent substrate comprise ink printed on said transparent substrate of a reduced concentration containing additives of not less than 15 wt % and not more than 27 wt % of solids, said additives comprising a first additive of a white coloring agent and a second additive of a fluorescent and light-accumulating substance.
Claim 9
Dependent Claim
39 words
The surface light source panel as set forth in claim 7, wherein: said ink of reduced concentration further has glass beads therein, said glass beads being added to said ink before said ink is printed on said transparent substrate.
Claim 10
Dependent Claim
51 words
The surface light source panel as set forth in claim 1, wherein: said transparent substrate has a thickness of not less than 6 mm; and said diffused reflection sections have a density on said transparent substrate of not less than 900 dots/inch 2 and not more than 2500 dots/inch 2 .
Claim 11
Dependent Claim
51 words
The surface light source panel as set forth in claim 1, wherein: said transparent substrate has a thickness of not less than 8 mm; and said diffused reflection sections have a density on said transparent substrate of not less than 2500 dots/inch 2 and not more than 4225 dots/inch 2 .
Claim 12
Dependent Claim
25 words
The surface light source panel as set forth in claim 1, wherein said transparent substrate comprises a single plate for each surface to be illuminated.
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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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |