| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2b6121dedd894b3f760906b68697d616 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02F1-141
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02F1-1393
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02F1-133638
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02F2203-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02F1-1418
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02F2413-02 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02F1-13471
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02F1-13363 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02F1-139
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B5-30
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02F1-141 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02F1-13363
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02F1-1335
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02F1-1347
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02F1-13 |
| filingDate |
1996-04-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b18e08a9f66f9c6cb4d2a0604d8571cb
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_daa3efde495687c73527a8fdeb8017fe |
| publicationDate |
1998-01-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-0820495-A1 |
| titleOfInvention |
Liquid crystal achromatic compound retarder |
| abstract |
This invention provides achromatic liquid crystal compound retarders, achromatic polarization switches, and achromatic shutters using the liquid crystal compound retarders. It further provides achromatic variable retardance smectic liquid crystal retarders. The compound retarder of this invention comprises a central liquid crystal retarder unit and two external passive retarders positioned in series with and on either side of the liquid crystal retarder unit. The liquid crystal retarder unit comprises either (1) a rotatable smectic liquid crystal half-wave retarder, or (2) first and second liquid crystal variable retarders having retardance switchable between zero and half-wave. The external passive retarders are equal in retardance and orientation to each other. Design equations determine the retardance of the external elements and their orientation relative to the central retarder to obtain a particular achromatic retardance for the compound structure. |
| priorityDate |
1995-04-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |