Patent US4648690A successfully refreshed from Google Patents.
US4648690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light diffusing device
Assignee: Mitsubishi Chemical Corp
•
Filing: 1985-05-01
•
Granted: 1987-03-10
•
Expires: 2005-05-01
Abstract
Abstract A light diffusing device is disclosed for an edge lighted panel wherein the device includes a thin transparent light transmitting base plate, a light diffusing layer formed on a front surface of the base plate and a light reflection surface formed in the vicinity of the rear surface of the base plate. The base plate and the light diffusing layer are integrally bonded together through an intermediate layer formed between the base plate and the light diffusing layer.
Inventors
- 👤 Makoto Ohe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:12
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/02; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/005; G02B6/0051; F; F21; F21V; F21V7/00; G02B6/0055; G02B6/0066; G02B6/007; G02B6/0071
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
102 words
A light diffusing device comprising: a transparent light transmitting base plate wherein at least one edge face of said base plate is a light incident face; a light diffusing layer formed on at least a first surface of said base plate wherein said light diffusing layer comprises a polymer product prepared by multi-stage polymerization of an alkyl methacrylate as a component; a light reflection surface formed in the vicinity of a second surface of said base plate; an intermediate layer formed between said base plate and said light diffusing layer to integrally bond together said base plate and said light diffusing layer.
Claim 2
Dependent Claim
102 words
A light diffusing device comprising: a transparent light transmitting base plate wherein at least one edge face of said base plate is a light incident face; a light diffusing layer formed on at least a first surface of said base plate wherein said light diffusing layer comprises a polymer product prepared by multi-stage polymerization of an alkyl methacrylate as a component; a light reflection surface formed in the vicinity of a second surface of said base plate; an intermediate layer formed between said base plate and said light diffusing layer to integrally bond together said base plate and said light diffusing layer.
Claim 3
Dependent Claim
24 words
A light diffusing device of claim 1, wherein said reflection surface is made smooth so that light is regularly reflected on said reflection surface.
Claim 4
Dependent Claim
39 words
The light diffusing device of claim 1, wherein each edge face of said base plate other than said light incident face comprises an inclined face having an acute angle with respect to said first surface of said base plate.
Claim 5
Dependent Claim
44 words
A light diffusing device of claim 3, wherein each of said edge faces other than said light incident face is provided with an irregular light reflection layer whereby light is irregularly reflected on each of said edge faces other than said light incident face.
Claim 6
Dependent Claim
42 words
The light diffusing device of claim 1, wherein said intermediate layer is formed through partial dissolution of said front surface of said base plate with a methacrylic monomer material containing a light diffusing agent from which said light diffusing layer is formed.
Claim 7
Dependent Claim
33 words
The light diffusing device of claim 1, wherein said intermediate layer is formed by a partial dissolution of a surface of said light diffusing layer with a methylmethacrylate monomer or partial polymer thereof.
Claim 8
Dependent Claim
16 words
The light diffusing device of claim 1, wherein said base plate is comprised of methylmethacrylate polymer.
Claim 9
Dependent Claim
19 words
The light diffusing device of claim 1, wherein said base plate has a thickness between 0.3 and 20 mm.
Claim 10
Dependent Claim
19 words
The light diffusing device of claim 8, wherein said base plate has a thickness between 3.0 and 15 mm.
Claim 11
Dependent Claim
20 words
The light diffusing device of claim 1, wherein said light diffusing layer has a thickness between 0.05 and 1 mm.
Claim 12
Dependent Claim
19 words
The light diffusing device of claim 1, wherein said intermediate layer has a thickness between 0.05 and 0.1 mm.
Claim 13
Dependent Claim
22 words
The light diffusing device of claim 1, wherein said light reflection surface is formed on said second surface of said base plate.
References Cited (Backward Citations)
US2831453A
Cited
US3402000A
Cited
US3464133A
Cited
US3491245A
Cited
US3838909A
Cited
US3909111A
Cited
US4059916A
Cited
US4249231A
Cited
US4277817A
Cited
US4415509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |