GB1229109A - - Google Patents
Info
- Publication number
- GB1229109A GB1229109A GB1229109DA GB1229109A GB 1229109 A GB1229109 A GB 1229109A GB 1229109D A GB1229109D A GB 1229109DA GB 1229109 A GB1229109 A GB 1229109A
- Authority
- GB
- United Kingdom
- Prior art keywords
- june
- opposide
- ricoh
- headings
- render
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
1,229,109. Reflex reflectors; projection screens. RICOH K.K. June 17, 1969 [June 25, 1968], No.30493/69. Headings G2A and G2J. A transparent element 11 has two opposide partspherical surfaces 11a, 11b which have a common centre of curvature 0 but different radii and a reflective coating covering the part-spherical surface 11a that has the larger radius to render it internally reflective. A plurality of the elements may be arranged to form a road sign or a projection screen.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4436368 | 1968-06-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1229109A true GB1229109A (en) | 1971-04-21 |
Family
ID=12689411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1229109D Expired GB1229109A (en) | 1968-06-25 | 1969-06-17 |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE1932259A1 (en) |
FR (1) | FR2011644A1 (en) |
GB (1) | GB1229109A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0029611B1 (en) * | 1979-11-27 | 1985-07-31 | D. Swarovski & Co. | Retroreflection plate |
DE2947719C2 (en) * | 1979-11-27 | 1981-08-27 | D. Swarovski & Co., 6112 Wattens, Tirol | Retroreflector plate |
DE3011955C2 (en) * | 1980-03-27 | 1982-05-13 | D. Swarovski & Co., 6112 Wattens, Tirol | Retroreflector sheet and process for making the same |
DE3931022A1 (en) * | 1989-09-16 | 1991-03-28 | Hommelwerke Gmbh | OPTICAL RETROR REFLECTOR |
-
1969
- 1969-06-17 GB GB1229109D patent/GB1229109A/en not_active Expired
- 1969-06-23 FR FR6920941A patent/FR2011644A1/fr not_active Withdrawn
- 1969-06-25 DE DE19691932259 patent/DE1932259A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE1932259A1 (en) | 1970-01-22 |
FR2011644A1 (en) | 1970-03-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |