GB1477175A - Retro-reflective transparent spheres or beads - Google Patents
Retro-reflective transparent spheres or beadsInfo
- Publication number
- GB1477175A GB1477175A GB2761074A GB2761074A GB1477175A GB 1477175 A GB1477175 A GB 1477175A GB 2761074 A GB2761074 A GB 2761074A GB 2761074 A GB2761074 A GB 2761074A GB 1477175 A GB1477175 A GB 1477175A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- sphere
- retro
- beads
- outer portion
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
- G02B5/126—Reflex reflectors including curved refracting surface
- G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix
Abstract
1477175 Reflex reflectors L EIGENMANN 21 June 1974 [25 June 1973] 27610/74 Heading G2J A transparent sphere for a reflex reflector, e.g. of 0À1-3À0mm. diameter, comprises a core 30 having a diameter greater than half the diameter of the sphere and a R.I. between 1À595 and 1À62 and an outer portion 32 having a R.I. between 1À47 and 1À52 and a "transparency factor T" (defined) greater than 75%. The core may be homogeneous and of glass while the outer portion may be layered, with R.I. decreasing outwardly, and made of a polymer. In the sphere of Fig. 2 (not shown) the diameter of the core is about <SP>2</SP>/3 that of the sphere; the R.I. of the core is 1À595 and that of the outer portion is 1À52. In the sphere of Fig. 4, the R.I. of the core 30 is 1À62 and that of the outer portion 32 is 1À47.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2578473A IT989428B (en) | 1973-06-25 | 1973-06-25 | IMPROVEMENT OF REFLECTIVE OR RETRO COLLIMATING SPHERICAL ELEMENTS FOR ROAD SIGNS AND EQUIVALENT USES AND RELATED IMPROVED SPHERICAL RETROCOLLIMANT ELEMENTS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1477175A true GB1477175A (en) | 1977-06-22 |
Family
ID=11217725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2761074A Expired GB1477175A (en) | 1973-06-25 | 1974-06-21 | Retro-reflective transparent spheres or beads |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5050891A (en) |
| BE (1) | BE816830A (en) |
| CA (1) | CA1012807A (en) |
| CH (1) | CH587495A5 (en) |
| DE (1) | DE2430797A1 (en) |
| DK (1) | DK340374A (en) |
| FR (1) | FR2234574B1 (en) |
| GB (1) | GB1477175A (en) |
| IT (1) | IT989428B (en) |
| NL (1) | NL7408573A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005022210A1 (en) * | 2003-08-29 | 2005-03-10 | Bae Systems Plc | Retroreflective device comprising gradient index lenses |
| WO2006052383A2 (en) * | 2004-11-08 | 2006-05-18 | Hewlett-Packard Development Company, L.P. | Optically retro-reflecting sphere with a concentric outer shell |
| WO2009085550A1 (en) * | 2007-12-21 | 2009-07-09 | 3M Innovative Properties Company | Retroreflective pavement markings |
| EP2238486A1 (en) * | 2007-12-21 | 2010-10-13 | 3M Innovative Properties Company | Retroreflective articles and retroreflective elements comprising a spherical core and two concentric optical interference layers |
| US9645289B2 (en) | 2013-09-27 | 2017-05-09 | Rohm And Haas Company | Optical effect coating |
| GB2545341A (en) * | 2015-12-09 | 2017-06-14 | Bae Systems Plc | Improvements in and relating to remote sensing |
| US10852201B2 (en) | 2015-12-09 | 2020-12-01 | Bae Systems Plc | Remote sensing |
| US10955345B2 (en) | 2015-12-09 | 2021-03-23 | Bae Systems Plc | Relating to remote sensing |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3931022A1 (en) * | 1989-09-16 | 1991-03-28 | Hommelwerke Gmbh | OPTICAL RETROR REFLECTOR |
| NO301797B1 (en) * | 1995-12-22 | 1997-12-08 | Norsk Hydro As | Retroreflective plate material and method for making such material |
-
1973
- 1973-06-25 IT IT2578473A patent/IT989428B/en active
-
1974
- 1974-06-20 CH CH846674A patent/CH587495A5/xx not_active IP Right Cessation
- 1974-06-21 GB GB2761074A patent/GB1477175A/en not_active Expired
- 1974-06-24 DE DE19742430797 patent/DE2430797A1/en not_active Withdrawn
- 1974-06-24 JP JP7146074A patent/JPS5050891A/ja active Pending
- 1974-06-24 FR FR7422913A patent/FR2234574B1/fr not_active Expired
- 1974-06-25 DK DK340374A patent/DK340374A/da unknown
- 1974-06-25 NL NL7408573A patent/NL7408573A/xx unknown
- 1974-06-25 CA CA203,367A patent/CA1012807A/en not_active Expired
- 1974-06-25 BE BE145858A patent/BE816830A/en unknown
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005022210A1 (en) * | 2003-08-29 | 2005-03-10 | Bae Systems Plc | Retroreflective device comprising gradient index lenses |
| US7170688B2 (en) | 2003-08-29 | 2007-01-30 | Bae Systems Plc | Retroreflective device comprising gradient index lenses |
| WO2006052383A2 (en) * | 2004-11-08 | 2006-05-18 | Hewlett-Packard Development Company, L.P. | Optically retro-reflecting sphere with a concentric outer shell |
| WO2006052383A3 (en) * | 2004-11-08 | 2006-06-15 | Hewlett Packard Development Co | Optically retro-reflecting sphere with a concentric outer shell |
| US7224533B2 (en) | 2004-11-08 | 2007-05-29 | Hewlett-Packard Development Company, L.P. | Optically retro-reflecting sphere |
| EP2238486A1 (en) * | 2007-12-21 | 2010-10-13 | 3M Innovative Properties Company | Retroreflective articles and retroreflective elements comprising a spherical core and two concentric optical interference layers |
| WO2009085550A1 (en) * | 2007-12-21 | 2009-07-09 | 3M Innovative Properties Company | Retroreflective pavement markings |
| US8496340B2 (en) | 2007-12-21 | 2013-07-30 | 3M Innovative Properties Company | Retroreflective articles and retroreflective elements comprising a spherical core and two concentric optical interference layers |
| CN101946043B (en) * | 2007-12-21 | 2013-08-07 | 3M创新有限公司 | Retroreflective pavement markings |
| US9645289B2 (en) | 2013-09-27 | 2017-05-09 | Rohm And Haas Company | Optical effect coating |
| GB2545341A (en) * | 2015-12-09 | 2017-06-14 | Bae Systems Plc | Improvements in and relating to remote sensing |
| GB2545341B (en) * | 2015-12-09 | 2020-06-24 | Bae Systems Plc | Improvements in and relating to remote sensing |
| US10852201B2 (en) | 2015-12-09 | 2020-12-01 | Bae Systems Plc | Remote sensing |
| US10955345B2 (en) | 2015-12-09 | 2021-03-23 | Bae Systems Plc | Relating to remote sensing |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2234574A1 (en) | 1975-01-17 |
| JPS5050891A (en) | 1975-05-07 |
| FR2234574B1 (en) | 1978-11-24 |
| CH587495A5 (en) | 1977-05-13 |
| CA1012807A (en) | 1977-06-28 |
| IT989428B (en) | 1975-05-20 |
| DK340374A (en) | 1975-02-10 |
| DE2430797A1 (en) | 1975-01-16 |
| NL7408573A (en) | 1974-12-30 |
| BE816830A (en) | 1974-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |