GB1231143A - - Google Patents
Info
- Publication number
- GB1231143A GB1231143A GB1231143DA GB1231143A GB 1231143 A GB1231143 A GB 1231143A GB 1231143D A GB1231143D A GB 1231143DA GB 1231143 A GB1231143 A GB 1231143A
- Authority
- GB
- United Kingdom
- Prior art keywords
- unit
- polarizing
- window
- stressed
- wave plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00634—Production of filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C1/14—Windows; Doors; Hatch covers or access panels; Surrounding frame structures; Canopies; Windscreens accessories therefor, e.g. pressure sensors, water deflectors, hinges, seals, handles, latches, windscreen wipers
- B64C1/1476—Canopies; Windscreens or similar transparent elements
- B64C1/1492—Structure and mounting of the transparent elements in the window or windscreen
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Aviation & Aerospace Engineering (AREA)
- Polarising Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
1,231,143. Optical apparatus. POLAROID CORP. Jan. 13, 1969 [Jan. 11, 1968], No. 1929/69. Heading G2J. In order to obviate the chromatical portrayal of the stress pattern produced in a stressed aircraft window having polariscopic attenuation, a wave plate producing at least a four wavelength retardation on midspectrum light i.e. 575 mÁ is interposed between the birefringent window and polarizer so that the profusion of colours so produced are to an observer individually indistinguishable and thus viewed as white light. As shown, light passes serially through a first stressed, structural polymethyl methacrylate (P.M.M.A.) member, a second, structural P. M. M. A. window member which may be stressed, a polyethylene terephthalate wave plate which produces a fifteen wavelength retardation and is bonded to a fixed polarizing unit and a rotatable analysing unit B to an observer (not shown). The polarizing and analysing units A, B are each formed by laminating a polarizing sheet of polyvinyl alcohol between two protective layers of cellulose acetate butyrate sealed between P. M. M. A. support elements. Attenuation efficiency may be improved by providing a second fixed polarizing unit having its axis parallel to the first polarizing unit, the rotatable analysing unit being placed therebetween. The wave plate may be free standing or bonded to one of the faces of either the first or second structural window members.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US69711368A | 1968-01-11 | 1968-01-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1231143A true GB1231143A (en) | 1971-05-12 |
Family
ID=24799860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1231143D Expired GB1231143A (en) | 1968-01-11 | 1969-01-13 |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS5020458B1 (en) |
BE (1) | BE726716A (en) |
DE (1) | DE1901154A1 (en) |
FR (1) | FR2000169A1 (en) |
GB (1) | GB1231143A (en) |
NL (1) | NL170254C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2184402A2 (en) * | 1972-05-15 | 1973-12-28 | Polaroid Corp | Plastics laminate window - contng ir absorbing dyes |
DE4116397C2 (en) * | 1991-05-18 | 1994-03-24 | Deutsche Aerospace Airbus | Darkening device |
-
1969
- 1969-01-10 BE BE726716D patent/BE726716A/xx not_active IP Right Cessation
- 1969-01-10 DE DE19691901154 patent/DE1901154A1/en not_active Withdrawn
- 1969-01-10 FR FR6900330A patent/FR2000169A1/fr not_active Withdrawn
- 1969-01-11 JP JP193569A patent/JPS5020458B1/ja active Pending
- 1969-01-13 NL NL6900517A patent/NL170254C/en not_active IP Right Cessation
- 1969-01-13 GB GB1231143D patent/GB1231143A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL6900517A (en) | 1969-07-15 |
BE726716A (en) | 1969-07-10 |
JPS5020458B1 (en) | 1975-07-15 |
DE1901154A1 (en) | 1970-03-05 |
NL170254B (en) | 1982-05-17 |
NL170254C (en) | 1982-10-18 |
FR2000169A1 (en) | 1969-08-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3213753A (en) | Multilayer lenticular light polarizing device | |
US4129357A (en) | Partial polarizer filter | |
KR890007103A (en) | LCD Display | |
GB1363885A (en) | Light beam polarization modulator | |
GB1231064A (en) | ||
SE322069B (en) | ||
US3647278A (en) | Light-transmitting elements | |
GB1194544A (en) | Liquid Crystal Detector | |
US2298059A (en) | Color correction filter employing light-polarizing material | |
GB1032529A (en) | Improvements in or relating to communication systems for acoustical vibrations | |
GB1247608A (en) | Production of optical fibres and apparatus therefor | |
US2260220A (en) | Variable density window | |
GB1231143A (en) | ||
GB1350821A (en) | Acousto-optical modulator systems | |
GB1289154A (en) | ||
GB1291977A (en) | Separating different wavelength bands from polychromatic beams | |
US2302507A (en) | Variable density window | |
US3644016A (en) | Optical isolator | |
GB1287025A (en) | A photometer arrangement for observation instruments | |
GB1142350A (en) | Display system | |
GB1409711A (en) | Optical systems | |
GB856932A (en) | Improvements in or relating to colour-selective optical systems corrected for astigmatism | |
US3068362A (en) | Polarized light control | |
GB1285640A (en) | Optical devices | |
US3198063A (en) | Direct reading uniaxial photoelastic transducer |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |