US4875766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced plastic reflector
Assignee: Mitsubishi Electric Corp
•
Filing: 1987-07-08
•
Granted: 1989-10-24
•
Expires: 2007-07-08
Abstract
Abstract A fiber reinforced plastic reflector has a sandwich construction and comprises a core, two fiber reinforced plastic plates which are secured to opposite sides of the core, and a reflecting film which is formed on the outer surface of one of the fiber reinforced plastic plates. The core is made from an isotropic material having a low density and a low linear expansion coefficient. In one form of the invention, the core is a plate of a material selected from a uniform foamed metal having a density of 0.1-1.0 g/cm 3 ; uniform, porous glass having a density of 0.05-1.0 g/cm 3 ; and a uniform, porous ceramic having a density of 0.3-1.0 g/cm 3 . In another form of the invention, the core is a corrugated sheet and a flat sheet which is secured to at least one side of the corrugated sheet, the corrugated sheet and said flat sheet being made of a material selected from a uniform Kevlar fiber reinforced plastic having a density of 0.03-1.0 g/cm 3 , a uniform ceramic having a density of 0.03-1.0 g/cm 3 , and a uniform carbon fiber reinforced plastic having a density of 0.03-1.0 g/cm 3 .
Inventors
- 👤 Hisayo Shimodaira
- 👤 Toshio Ono
- 👤 Keizo Miyawaki
- 👤 Tatsuya Hamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:36
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/141; H01Q15/142; G; G02; G02B; G02B5/00; G02B5/08; G02B5/10; G02B7/00; G02B7/18; G02B7/182; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24711; Y10T428/24727; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249977
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A fiber reinforced plastic reflector comprising: a core which is made of an isotropic material with respect to mechanical and thermal properties selected from a uniform foamed metal having a density of 0.1-1.0 g/cm 3 , uniform porous glass having a density of 0.05-1.0 g/cm 3 , and a uniform porous ceramic having a density of 0.3-1.0 g/cm 3 ; two fiber reinforced plastic plates which are secured to opposite sides of the said core; and a reflecting film which is formed atop the outer surface of one of said fiber reinforced plastic plates; said core and said plastic plates having a linear thermal expansion coefficient of ≦1×10 -5 /C. and providing a lightweight reflector not subject to significant thermal deformation.
Claim 2
Dependent Claim
121 words
A fiber reinforced plastic reflector comprising: a core which is made of an isotropic material with respect to mechanical and thermal properties selected from a uniform foamed metal having a density of 0.1-1.0 g/cm 3 , uniform porous glass having a density of 0.05-1.0 g/cm 3 , and a uniform porous ceramic having a density of 0.3-1.0 g/cm 3 ; two fiber reinforced plastic plates which are secured to opposite sides of the said core; and a reflecting film which is formed atop the outer surface of one of said fiber reinforced plastic plates; said core and said plastic plates having a linear thermal expansion coefficient of ≦1×10 -5 /C. and providing a lightweight reflector not subject to significant thermal deformation.
Claim 3
Dependent Claim
33 words
A fiber reinforced plastic reflector as claimed in claim 1 further comprising a smooth and hard substrate which is disposed atop said one of said fiber reinforced plastic plates beneath said reflecting film.
Claim 4
Dependent Claim
19 words
A fiber reinforced plastic reflector as claimed in claim 2 wherein said substrate is made from glass or metal.
Claim 5
Dependent Claim
23 words
A fiber reinforced plastic reflector as claimed in claim 2 wherein said core is foamed metal selected from foamed aluminum and foamed magnesium.
Claim 6
Dependent Claim
23 words
A fiber reinforced plastic reflector as claimed in claim 3 wherein said core is foamed metal selected from foamed aluminum and foamed magnesium.
Claim 7
Dependent Claim
24 words
A fiber reinforced plastic reflector as claimed in claim 1 wherein said core is a foamed metal selected from foamed aluminum and foamed magnesium.
Claim 8
Dependent Claim
149 words
A fiber reinforced plastic reflector comprising: a core comprising a corrugated sheet and a flat sheet which is secured to one side of said corrugated sheet, said corrugated sheet and said flat sheet being made of an isotropic material with respect to mechanical and thermal properties selected from a uniform Kevlar fiber reinforced plastic having a density of 0.03-1.0 g/cm 3 , a uniform ceramic having a density of 0.03-1.0 g/cm 3 , and a uniform carbon fiber reinforced plastic having a density of 0.03-1.0 g/cm 3 ; two fiber reinforced plastic plates which are secured to opposite sides of the said core; and a reflecting film which is formed atop the outer surface of one of said fiber reinforced plastic plates; said core and said plastic plates having a linear thermal expansion coefficient of ≦1×10 -5 /C. and providing a lightweight reflector not subject to significant thermal deformation.
Claim 9
Dependent Claim
149 words
A fiber reinforced plastic reflector comprising: a core comprising a corrugated sheet and a flat sheet which is secured to one side of said corrugated sheet, said corrugated sheet and said flat sheet being made of an isotropic material with respect to mechanical and thermal properties selected from a uniform Kevlar fiber reinforced plastic having a density of 0.03-1.0 g/cm 3 , a uniform ceramic having a density of 0.03-1.0 g/cm 3 , and a uniform carbon fiber reinforced plastic having a density of 0.03-1.0 g/cm 3 ; two fiber reinforced plastic plates which are secured to opposite sides of the said core; and a reflecting film which is formed atop the outer surface of one of said fiber reinforced plastic plates; said core and said plastic plates having a linear thermal expansion coefficient of ≦1×10 -5 /C. and providing a lightweight reflector not subject to significant thermal deformation.
Claim 10
Dependent Claim
33 words
A fiber reinforced plastic reflector as claimed in claim 7, further comprising a smooth and hard substrate which is disposed atop said one of said fiber reinforced plastic plates beneath said reflecting film.
Claim 11
Dependent Claim
19 words
A fiber reinforced plastic reflector as claimed in claim 8, wherein said substrate is made from glass or metal.
References Cited (Backward Citations)
GB871863A
Cited
US3707401A
Cited
US3839080A
Cited
FR2215631A1
Cited
US4025462A
Cited
GB1451397A
Cited
GB1453257A
Cited
US4077853A
Cited
US4259092A
Cited
US4124277A
Cited
US4364637A
Cited
US4238265A
Cited
US4358507A
Cited
JPS5624302A
Cited
DE3006393A1
Cited
US4358508A
Cited
US4343533A
Cited
DE3216844A1
Cited
US4435043A
Cited
US4465734A
Cited
US4464429A
Cited
JPS58169102A
Cited
US4550986A
Cited
US4670338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |